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  Subjects -> ENGINEERING (Total: 2272 journals)
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    - ENGINEERING (1204 journals)
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ENGINEERING (1204 journals)                  1 2 3 4 5 6 7 | Last

Showing 1 - 200 of 1205 Journals sorted alphabetically
3 Biotech     Open Access   (Followers: 7)
3D Research     Hybrid Journal   (Followers: 17)
AAPG Bulletin     Hybrid Journal   (Followers: 7)
AASRI Procedia     Open Access   (Followers: 15)
Abstract and Applied Analysis     Open Access   (Followers: 3)
Aceh International Journal of Science and Technology     Open Access   (Followers: 2)
ACS Nano     Full-text available via subscription   (Followers: 247)
Acta Geotechnica     Hybrid Journal   (Followers: 7)
Acta Metallurgica Sinica (English Letters)     Hybrid Journal   (Followers: 5)
Acta Polytechnica : Journal of Advanced Engineering     Open Access   (Followers: 2)
Acta Scientiarum. Technology     Open Access   (Followers: 3)
Acta Universitatis Cibiniensis. Technical Series     Open Access  
Active and Passive Electronic Components     Open Access   (Followers: 7)
Adaptive Behavior     Hybrid Journal   (Followers: 11)
Adıyaman Üniversitesi Mühendislik Bilimleri Dergisi     Open Access  
Adsorption     Hybrid Journal   (Followers: 4)
Advanced Engineering Forum     Full-text available via subscription   (Followers: 6)
Advanced Science     Open Access   (Followers: 5)
Advanced Science Focus     Free   (Followers: 3)
Advanced Science Letters     Full-text available via subscription   (Followers: 8)
Advanced Science, Engineering and Medicine     Partially Free   (Followers: 7)
Advanced Synthesis & Catalysis     Hybrid Journal   (Followers: 17)
Advances in Calculus of Variations     Hybrid Journal   (Followers: 2)
Advances in Catalysis     Full-text available via subscription   (Followers: 5)
Advances in Complex Systems     Hybrid Journal   (Followers: 7)
Advances in Engineering Software     Hybrid Journal   (Followers: 25)
Advances in Fuel Cells     Full-text available via subscription   (Followers: 16)
Advances in Fuzzy Systems     Open Access   (Followers: 5)
Advances in Geosciences (ADGEO)     Open Access   (Followers: 10)
Advances in Heat Transfer     Full-text available via subscription   (Followers: 22)
Advances in Human Factors/Ergonomics     Full-text available via subscription   (Followers: 26)
Advances in Magnetic and Optical Resonance     Full-text available via subscription   (Followers: 9)
Advances in Natural Sciences: Nanoscience and Nanotechnology     Open Access   (Followers: 29)
Advances in Operations Research     Open Access   (Followers: 11)
Advances in OptoElectronics     Open Access   (Followers: 5)
Advances in Physics Theories and Applications     Open Access   (Followers: 12)
Advances in Polymer Science     Hybrid Journal   (Followers: 41)
Advances in Porous Media     Full-text available via subscription   (Followers: 4)
Advances in Remote Sensing     Open Access   (Followers: 37)
Advances in Science and Research (ASR)     Open Access   (Followers: 6)
Aerobiologia     Hybrid Journal   (Followers: 1)
African Journal of Science, Technology, Innovation and Development     Hybrid Journal   (Followers: 4)
AIChE Journal     Hybrid Journal   (Followers: 31)
Ain Shams Engineering Journal     Open Access   (Followers: 5)
Akademik Platform Mühendislik ve Fen Bilimleri Dergisi     Open Access  
Alexandria Engineering Journal     Open Access   (Followers: 1)
AMB Express     Open Access   (Followers: 1)
American Journal of Applied Sciences     Open Access   (Followers: 28)
American Journal of Engineering and Applied Sciences     Open Access   (Followers: 11)
American Journal of Engineering Education     Open Access   (Followers: 9)
American Journal of Environmental Engineering     Open Access   (Followers: 17)
American Journal of Industrial and Business Management     Open Access   (Followers: 23)
Analele Universitatii Ovidius Constanta - Seria Chimie     Open Access  
Annals of Combinatorics     Hybrid Journal   (Followers: 3)
Annals of Pure and Applied Logic     Open Access   (Followers: 2)
Annals of Regional Science     Hybrid Journal   (Followers: 7)
Annals of Science     Hybrid Journal   (Followers: 7)
Applicable Algebra in Engineering, Communication and Computing     Hybrid Journal   (Followers: 2)
Applicable Analysis: An International Journal     Hybrid Journal   (Followers: 1)
Applied Catalysis A: General     Hybrid Journal   (Followers: 6)
Applied Catalysis B: Environmental     Hybrid Journal   (Followers: 16)
Applied Clay Science     Hybrid Journal   (Followers: 5)
Applied Computational Intelligence and Soft Computing     Open Access   (Followers: 12)
Applied Magnetic Resonance     Hybrid Journal   (Followers: 4)
Applied Nanoscience     Open Access   (Followers: 8)
Applied Network Science     Open Access   (Followers: 1)
Applied Numerical Mathematics     Hybrid Journal   (Followers: 5)
Applied Physics Research     Open Access   (Followers: 3)
Applied Sciences     Open Access   (Followers: 2)
Applied Spatial Analysis and Policy     Hybrid Journal   (Followers: 4)
Arabian Journal for Science and Engineering     Hybrid Journal   (Followers: 5)
Archives of Computational Methods in Engineering     Hybrid Journal   (Followers: 4)
Archives of Foundry Engineering     Open Access  
Archives of Thermodynamics     Open Access   (Followers: 7)
Arkiv för Matematik     Hybrid Journal   (Followers: 1)
ASEE Prism     Full-text available via subscription   (Followers: 3)
Asia-Pacific Journal of Science and Technology     Open Access  
Asian Engineering Review     Open Access  
Asian Journal of Applied Science and Engineering     Open Access   (Followers: 1)
Asian Journal of Applied Sciences     Open Access   (Followers: 2)
Asian Journal of Biotechnology     Open Access   (Followers: 8)
Asian Journal of Control     Hybrid Journal  
Asian Journal of Current Engineering & Maths     Open Access  
Asian Journal of Technology Innovation     Hybrid Journal   (Followers: 8)
Assembly Automation     Hybrid Journal   (Followers: 2)
at - Automatisierungstechnik     Hybrid Journal   (Followers: 1)
ATZagenda     Hybrid Journal  
ATZextra worldwide     Hybrid Journal  
Australasian Physical & Engineering Sciences in Medicine     Hybrid Journal   (Followers: 1)
Australian Journal of Multi-Disciplinary Engineering     Full-text available via subscription   (Followers: 2)
Autonomous Mental Development, IEEE Transactions on     Hybrid Journal   (Followers: 8)
Avances en Ciencias e Ingeniería     Open Access  
Balkan Region Conference on Engineering and Business Education     Open Access   (Followers: 1)
Bangladesh Journal of Scientific and Industrial Research     Open Access  
Basin Research     Hybrid Journal   (Followers: 5)
Batteries     Open Access   (Followers: 5)
Bautechnik     Hybrid Journal   (Followers: 1)
Bell Labs Technical Journal     Hybrid Journal   (Followers: 23)
Beni-Suef University Journal of Basic and Applied Sciences     Open Access   (Followers: 4)
BER : Manufacturing Survey : Full Survey     Full-text available via subscription   (Followers: 2)
BER : Motor Trade Survey     Full-text available via subscription   (Followers: 1)
BER : Retail Sector Survey     Full-text available via subscription   (Followers: 2)
BER : Retail Survey : Full Survey     Full-text available via subscription   (Followers: 2)
BER : Survey of Business Conditions in Manufacturing : An Executive Summary     Full-text available via subscription   (Followers: 3)
BER : Survey of Business Conditions in Retail : An Executive Summary     Full-text available via subscription   (Followers: 3)
Bharatiya Vaigyanik evam Audyogik Anusandhan Patrika (BVAAP)     Open Access   (Followers: 1)
Biofuels Engineering     Open Access  
Biointerphases     Open Access   (Followers: 1)
Biomaterials Science     Full-text available via subscription   (Followers: 10)
Biomedical Engineering     Hybrid Journal   (Followers: 16)
Biomedical Engineering and Computational Biology     Open Access   (Followers: 13)
Biomedical Engineering Letters     Hybrid Journal   (Followers: 5)
Biomedical Engineering, IEEE Reviews in     Full-text available via subscription   (Followers: 17)
Biomedical Engineering, IEEE Transactions on     Hybrid Journal   (Followers: 32)
Biomedical Engineering: Applications, Basis and Communications     Hybrid Journal   (Followers: 5)
Biomedical Microdevices     Hybrid Journal   (Followers: 9)
Biomedical Science and Engineering     Open Access   (Followers: 4)
Biomedizinische Technik - Biomedical Engineering     Hybrid Journal  
Biomicrofluidics     Open Access   (Followers: 4)
BioNanoMaterials     Hybrid Journal   (Followers: 2)
Biotechnology Progress     Hybrid Journal   (Followers: 39)
Boletin Cientifico Tecnico INIMET     Open Access  
Botswana Journal of Technology     Full-text available via subscription   (Followers: 1)
Boundary Value Problems     Open Access   (Followers: 1)
Brazilian Journal of Science and Technology     Open Access   (Followers: 2)
Broadcasting, IEEE Transactions on     Hybrid Journal   (Followers: 10)
Bulletin of Canadian Petroleum Geology     Full-text available via subscription   (Followers: 14)
Bulletin of Engineering Geology and the Environment     Hybrid Journal   (Followers: 9)
Bulletin of the Crimean Astrophysical Observatory     Hybrid Journal  
Cahiers, Droit, Sciences et Technologies     Open Access  
Calphad     Hybrid Journal  
Canadian Geotechnical Journal     Hybrid Journal   (Followers: 22)
Canadian Journal of Remote Sensing     Full-text available via subscription   (Followers: 43)
Case Studies in Engineering Failure Analysis     Open Access   (Followers: 8)
Case Studies in Thermal Engineering     Open Access   (Followers: 4)
Catalysis Communications     Hybrid Journal   (Followers: 6)
Catalysis Letters     Hybrid Journal   (Followers: 2)
Catalysis Reviews: Science and Engineering     Hybrid Journal   (Followers: 8)
Catalysis Science and Technology     Free   (Followers: 7)
Catalysis Surveys from Asia     Hybrid Journal   (Followers: 3)
Catalysis Today     Hybrid Journal   (Followers: 8)
CEAS Space Journal     Hybrid Journal  
Cellular and Molecular Neurobiology     Hybrid Journal   (Followers: 3)
Central European Journal of Engineering     Hybrid Journal   (Followers: 1)
CFD Letters     Open Access   (Followers: 6)
Chaos : An Interdisciplinary Journal of Nonlinear Science     Hybrid Journal   (Followers: 2)
Chaos, Solitons & Fractals     Hybrid Journal   (Followers: 3)
Chinese Journal of Catalysis     Full-text available via subscription   (Followers: 2)
Chinese Journal of Engineering     Open Access   (Followers: 2)
Chinese Science Bulletin     Open Access   (Followers: 1)
Ciencia e Ingenieria Neogranadina     Open Access  
Ciencia en su PC     Open Access   (Followers: 1)
Ciencias Holguin     Open Access   (Followers: 1)
CienciaUAT     Open Access  
Cientifica     Open Access  
CIRP Annals - Manufacturing Technology     Full-text available via subscription   (Followers: 11)
CIRP Journal of Manufacturing Science and Technology     Full-text available via subscription   (Followers: 14)
City, Culture and Society     Hybrid Journal   (Followers: 22)
Clay Minerals     Full-text available via subscription   (Followers: 10)
Clean Air Journal     Full-text available via subscription   (Followers: 2)
Coal Science and Technology     Full-text available via subscription   (Followers: 3)
Coastal Engineering     Hybrid Journal   (Followers: 11)
Coastal Engineering Journal     Hybrid Journal   (Followers: 5)
Coatings     Open Access   (Followers: 4)
Cogent Engineering     Open Access   (Followers: 2)
Cognitive Computation     Hybrid Journal   (Followers: 4)
Color Research & Application     Hybrid Journal   (Followers: 1)
COMBINATORICA     Hybrid Journal  
Combustion Theory and Modelling     Hybrid Journal   (Followers: 13)
Combustion, Explosion, and Shock Waves     Hybrid Journal   (Followers: 13)
Communications Engineer     Hybrid Journal   (Followers: 1)
Communications in Numerical Methods in Engineering     Hybrid Journal   (Followers: 2)
Components, Packaging and Manufacturing Technology, IEEE Transactions on     Hybrid Journal   (Followers: 26)
Composite Interfaces     Hybrid Journal   (Followers: 6)
Composite Structures     Hybrid Journal   (Followers: 267)
Composites Part A : Applied Science and Manufacturing     Hybrid Journal   (Followers: 187)
Composites Part B : Engineering     Hybrid Journal   (Followers: 283)
Composites Science and Technology     Hybrid Journal   (Followers: 179)
Comptes Rendus Mécanique     Full-text available via subscription   (Followers: 2)
Computation     Open Access  
Computational Geosciences     Hybrid Journal   (Followers: 14)
Computational Optimization and Applications     Hybrid Journal   (Followers: 7)
Computational Science and Discovery     Full-text available via subscription   (Followers: 2)
Computer Applications in Engineering Education     Hybrid Journal   (Followers: 7)
Computer Science and Engineering     Open Access   (Followers: 17)
Computers & Geosciences     Hybrid Journal   (Followers: 28)
Computers & Mathematics with Applications     Full-text available via subscription   (Followers: 5)
Computers and Electronics in Agriculture     Hybrid Journal   (Followers: 4)
Computers and Geotechnics     Hybrid Journal   (Followers: 10)
Computing and Visualization in Science     Hybrid Journal   (Followers: 5)
Computing in Science & Engineering     Full-text available via subscription   (Followers: 30)
Conciencia Tecnologica     Open Access  
Concurrent Engineering     Hybrid Journal   (Followers: 3)
Continuum Mechanics and Thermodynamics     Hybrid Journal   (Followers: 7)
Control and Dynamic Systems     Full-text available via subscription   (Followers: 9)
Control Engineering Practice     Hybrid Journal   (Followers: 42)
Control Theory and Informatics     Open Access   (Followers: 8)
Corrosion Science     Hybrid Journal   (Followers: 25)
CT&F Ciencia, Tecnologia y Futuro     Open Access   (Followers: 1)
CTheory     Open Access  

        1 2 3 4 5 6 7 | Last

Journal Cover Case Studies in Thermal Engineering
  [SJR: 0.966]   [H-I: 7]   [4 followers]  Follow
    
  This is an Open Access Journal Open Access journal
   ISSN (Online) 2214-157X
   Published by Elsevier Homepage  [3051 journals]
  • Effect of square wings in multiple square perforated twisted tapes on
           fluid flow and heat transfer of heat exchanger tube

    • Authors: Amar Raj Singh Suri; Anil Kumar; Rajesh Maithani
      Pages: 28 - 43
      Abstract: Publication date: September 2017
      Source:Case Studies in Thermal Engineering, Volume 10
      Author(s): Amar Raj Singh Suri, Anil Kumar, Rajesh Maithani
      This work presents, an experimental study on Nusselt number ( Nu rs ) and friction factor ( f rs ) of heat exchanger circular tube fitted with multiple square perforated with square wing twisted tape inserts. The experimental determination encompassed the geometrical parameters namely, wing depth ratio ( W d / W T ) of 0.042–0.167, perforation width ratio ( a / W T ) of 0.250, twist ratio ( T L / W T ) of 2.5, and number of twisted tapes ( N T ) of 4.0. The effect of multiple square perforated twisted tape with square wing has been investigated for the range of Reynolds number ( Re n ) varied from 5000 to 27,000. The maximum enhancement in Nu rs and f rs is observed to be 6.96 and 8.34 times of that of the plain circular tube, respectively. Correlations of Nu rs , f rs and η p are established in term of Re n and geometrical parameters of wings twisted tape which can be used to predict the values of Nu rs , f rs and η p with considerably good accuracy.

      PubDate: 2017-03-15T09:53:52Z
      DOI: 10.1016/j.csite.2017.03.002
      Issue No: Vol. 10 (2017)
       
  • Experimental performance investigation of minichannel water
           cooled-thermoelectric refrigerator

    • Authors: Murat Gökçek; Fatih Şahin
      Pages: 54 - 62
      Abstract: Publication date: September 2017
      Source:Case Studies in Thermal Engineering, Volume 10
      Author(s): Murat Gökçek, Fatih Şahin
      An experimental performance analysis of minichannel water cooled-thermoelectric refrigerator in this study is presented. The cooling system of refrigerator is consists of two thermoelectric modules integrated with the minichannel heat sinks in its hot side and the heat dissipaters in its cold side. The experiments carried out for different system voltages and different flow rates of cooling water in the minichannel. The results show that the inner temperature of water cooled-thermoelectric refrigerator is about 2°C for 0.8L/min flow rate while it is about −0.1°C for 1.5L/min flow rate at the end of 2-h experiment. COP value of thermoelectric refrigerator is 0.23 in the flow rate 1.5L/min while COP is 0.19 in the flow rate 0.8L/min at the end of 25min cooling times. When it comes to 8V system voltages, COP of the thermoelectric refrigerator is about 0.41 at the end of 25min operating period for the flow rate 1.5L/min. This study concludes that the performance of minichannel heat sink used in this study has as good as other liquid water cooled systems used to absorb heat from thermoelectric modules hot side.

      PubDate: 2017-03-27T16:40:11Z
      DOI: 10.1016/j.csite.2017.03.004
      Issue No: Vol. 10 (2017)
       
  • Effect of the thermal insulation layer location on wall dynamic thermal
           response rate under the air-conditioning intermittent operation

    • Authors: Lili Zhang; Tao Luo; Xi Meng; Yating Wang; Chaoping Hou; Enshen Long
      Pages: 79 - 85
      Abstract: Publication date: September 2017
      Source:Case Studies in Thermal Engineering, Volume 10
      Author(s): Lili Zhang, Tao Luo, Xi Meng, Yating Wang, Chaoping Hou, Enshen Long
      Although the air-conditioning intermittent operation is widely used in buildings, more attention is focused on the air-conditioning continuous operation in the whole building to simplify energy conservation design, and thereby, the operation method inconsistence of air-conditioning must lead to the large difference between actual value and design value of energy consumption. According to this situation, in order to explore the wall energy conservation difference under the continuous and intermittent operation of air-conditioning, a experiment is built to analyze the effect of the thermal insulation layer location on wall dynamic thermal response rate. Experimental result shows that under the air-conditioning intermittent operation, wall cold storage is the main source of air-conditioning load formed by walls and the wall internal layer has the significant effect on the wall dynamic thermal response performance. And the closer to wall inner surface for the thermal insulation layer, the lower the inner surface temperature and the higher the wall thermal response rate. Meanwhile, the internal thermal insulation wall has the smallest heat flow value, which is less 35–86% than external thermal insulation wall and the sandwich thermal insulation wall, although they have the same heat transfer coefficients.

      PubDate: 2017-04-11T18:44:37Z
      DOI: 10.1016/j.csite.2017.04.001
      Issue No: Vol. 10 (2017)
       
  • Analysis on the cooling water system operation under the first time test
           of 40Tesla hybrid magnet

    • Authors: J.L. Tang; Z.R. OuYang
      Pages: 95 - 99
      Abstract: Publication date: September 2017
      Source:Case Studies in Thermal Engineering, Volume 10
      Author(s): J.L. Tang, Z.R. OuYang
      The hybrid magnet of the High Magnetic Field Laboratory has reached its premier goal of 40 T. A detailed analysis has been carried on the cooling water system for insert resistive magnet, and about the de-ionized water quality, the time for purification and the operation parameters. Some phenomena and problems during the resistive magnet excitation have been analyzed. The de-ionized water resistivity presents a continuous declination trend. The flow rate of the de-ionized water and the heat load in both sides of the heat exchanger is imbalance. Some possible reasons were given. The further improvement methods and measures to some problems of the system have been proposed.

      PubDate: 2017-05-12T18:01:52Z
      DOI: 10.1016/j.csite.2017.05.004
      Issue No: Vol. 10 (2017)
       
  • Numerical study of three-dimensional natural convection and entropy
           generation in a cubical cavity with partially active vertical walls

    • Authors: Abdullah A.A.A Al-Rashed; Lioua Kolsi; Ahmed Kadhim Hussein; Walid Hassen; Mohamed Aichouni; Mohamed Naceur Borjini
      Pages: 100 - 110
      Abstract: Publication date: September 2017
      Source:Case Studies in Thermal Engineering, Volume 10
      Author(s): Abdullah A.A.A Al-Rashed, Lioua Kolsi, Ahmed Kadhim Hussein, Walid Hassen, Mohamed Aichouni, Mohamed Naceur Borjini
      Natural convection and entropy generation due to the heat transfer and fluid friction irreversibilities in a three-dimensional cubical cavity with partially heated and cooled vertical walls has been investigated numerically using the finite volume method. Four different arrangements of partially active vertical sidewalls of the cubical cavity are considered. Numerical calculations are carried out for Rayleigh numbers from (103 ≤ Ra ≤ 106), various locations of the partial heating and cooling vertical sidewalls, while the Prandtl number of air is considered constant as Pr=0.7) and the irreversibility coefficient is taken as ( φ = 10 − 4 ). The results explain that the total entropy generation rate increases when the Rayleigh number increases. While, the Bejan number decreases as the Rayleigh number increases. Also, it is found that the arrangements of heating and cooling regions have a significant effect on the fluid flow and heat transfer characteristics of natural convection and entropy generation in a cubical cavity. The Middle-Middle arrangement produces higher values of average Nusselt numbers.

      PubDate: 2017-05-12T18:01:52Z
      DOI: 10.1016/j.csite.2017.05.003
      Issue No: Vol. 10 (2017)
       
  • Techno-economic feasibility analysis of 1MW photovoltaic grid connected
           system in Oman

    • Authors: Hussein A. Kazem; M.H. Albadi; Ali H.A. Al-Waeli; Ahmed H. Al-Busaidi; Miqdam T. Chaichan
      Pages: 131 - 141
      Abstract: Publication date: September 2017
      Source:Case Studies in Thermal Engineering, Volume 10
      Author(s): Hussein A. Kazem, M.H. Albadi, Ali H.A. Al-Waeli, Ahmed H. Al-Busaidi, Miqdam T. Chaichan
      Solar photovoltaic panels (PV) face many challenges in the Sultanate of Oman. These challenges include costs, policy and technical development. With the growing needs of the Sultanate in the energy sector, Grid Connected PV (GCPV) system could help in reducing peak load demand and offer an alternative energy source. This study aims to numerically discover the optimal configuration for a 1MW GCPV plant in Adam city. Real time data, on hour-by-hour basis, from the location are used to ensure highest accuracy. The simulation not only is set for technical evaluation but economic as well. Investment in GCPV technology needs a bigger push both by research, development and policy. The assessment results show that the PV technology investment is very promising in this site whereas the annual yield factor of the system is 1875.1 kWh/kWp. Meanwhile, the capacity factor of the proposed system is 21.7%. The cost of energy found for the plant is around 0.2258 USD/kWh which is economically feasible and shows great promise.
      Graphical abstract image

      PubDate: 2017-06-02T20:19:47Z
      DOI: 10.1016/j.csite.2017.05.008
      Issue No: Vol. 10 (2017)
       
  • Study the effect of axially perforated twisted tapes on the thermal
           performance enhancement factor of a double tube heat exchanger

    • Authors: Nemat Mashoofi; Saman Pourahmad; S.M. Pesteei
      Pages: 161 - 168
      Abstract: Publication date: September 2017
      Source:Case Studies in Thermal Engineering, Volume 10
      Author(s): Nemat Mashoofi, Saman Pourahmad, S.M. Pesteei
      The main objective of this numerical study is to investigate the ways to reduce the pressure drop and consequently increase thermal performance enhancement factor (TEF) of a heat exchanger equipped with twisted tapes. For this purpose, axial perforated twisted tapes (PTTs) with various hole diameters are used instead of simple twisted tapes (STTs). Moreover, the variations of the effectiveness with number of transfer units ( NTU ) for different heat capacity ratios ( C r ) were presented. The numerical model was well validated with the available experimental results. The results indicated that the use of perforated twisted tape leads to a reduction in pressure drop and heat transfer rate, subsequently; a significant increase in TEF was seen compared to simple twisted tapes. In addition, some correlations were formulated to present the numerical results.

      PubDate: 2017-06-11T20:47:07Z
      DOI: 10.1016/j.csite.2017.06.001
      Issue No: Vol. 10 (2017)
       
  • Effect of aluminum-foam heat sink on inclined hot surface temperature in
           the case of free convection heat transfer

    • Authors: M. Paknezhad; A.M. Rashidi; T. Yousefi; Z. Saghir
      Pages: 199 - 206
      Abstract: Publication date: September 2017
      Source:Case Studies in Thermal Engineering, Volume 10
      Author(s): M. Paknezhad, A.M. Rashidi, T. Yousefi, Z. Saghir
      The need to more powerful electronic chips cause more heat generation as a consequence. So it leads to apply metal foam heat sink as a powerful cooling methods. The objective of this paper is to experimentally investigate the effect of inclination angle on the temperature of a heated surface with and without metal foam in the case of free convection heat transfer conditions. Experimental modeling has been conducted using an electrical resistor on an aluminum plate with and without aluminum metal foam in different angles with respect to the horizontal direction. The results show that the temperature variations have a linear dependency to the sine of inclination angle up to 45° and 60° for plate with and without metal foam, respectively. The slope of the lines are positive in low power input and negative in high power input. The effect of applying metal foam depends on the input power and inclination angle. In the presence of foam, the surface temperature has a decrease of 16°C with respect to a flat plate. The maximum cooling efficiency using foam is about %17 at 90° inclination angle.

      PubDate: 2017-07-03T08:31:58Z
      DOI: 10.1016/j.csite.2017.06.007
      Issue No: Vol. 10 (2017)
       
  • Numerical approach for reliability based inspection periods (RBIP) of
           fluid pipes

    • Authors: Hocine Mzad; Rabia Khelif
      Pages: 207 - 215
      Abstract: Publication date: September 2017
      Source:Case Studies in Thermal Engineering, Volume 10
      Author(s): Hocine Mzad, Rabia Khelif
      The welded joints are often dimensioned over one given lifetime while following an approach of the type S-N on the basis of acceptable probability of failure which should not be exceeded over the base period. The cracks induced by the welding process can be propagated and become critical during the useful lifetime of the structure, unless they are detected and repaired in time. Consequently, prevention of fractures becomes a necessity and is carried out by inspection and analysis of the harmfulness of defects. In this paper, we propose a mechanical model of steel tube HLE X70 at the weld region using the Paris law and where some parameter effects are discussed. To determine the optimum inspection cycle, it is necessary to know the lifetime of the welded joints. The reliability analysis is performed through specific algorithms to elucidate the most likely failure configuration. The economic inspection cycle is determined using the reliability index and the total cost of the structure.

      PubDate: 2017-07-03T08:31:58Z
      DOI: 10.1016/j.csite.2017.06.004
      Issue No: Vol. 10 (2017)
       
  • Methods and techniques of improving experimental testing for microfluidic
           heat sinks

    • Authors: Samuel D. Marshall; Lakshmi Balasubramaniam; Rerngchai Arayanarakool; Bing Li; Poh Seng Lee; Peter C.Y. Chen
      Pages: 227 - 233
      Abstract: Publication date: September 2017
      Source:Case Studies in Thermal Engineering, Volume 10
      Author(s): Samuel D. Marshall, Lakshmi Balasubramaniam, Rerngchai Arayanarakool, Bing Li, Poh Seng Lee, Peter C.Y. Chen
      There exist numerous methods of experimentally testing designs for heat sinks in the laboratory, especially for microscale fluidic devices, which can lead to a problem for comparison between new studies and those in the literature. To explore this issue, laboratory-based experiments on the heat transfer and flow impedance properties of a sample microchannel heat sink were repeated over a varying range of equipment. Three types of heat source (hot plate, film heater and copper block with cartridge heaters), two types of piping (polymer and metal), and the presence or absence of manifolds were investigated and the differences in heat sink performance were noted. Overall, especially in terms of achieving consistent, repeatable results, it was found that the arrangement of copper block heater, metal piping and the inclusion of manifolds was superior for this particular microchannel device. Hence, it is suggested that future testing of heat sinks and heat exchanger devices employ a similar arrangement of equipment for greater accuracy and comparability. In particular, the plastic tubing and hot plate configurations were found to have relatively poor consistency when testing the heat sink, and the film heater produced non-uniform heating, even over a small surface area.

      PubDate: 2017-07-12T05:51:43Z
      DOI: 10.1016/j.csite.2017.07.001
      Issue No: Vol. 10 (2017)
       
  • Experimental analysis of diffusion absorption refrigerator driven by
           electrical heater and engine exhaust gas

    • Authors: Mohamed Izzedine Serge ADJIBADE; Ababacar THIAM; Christophe AWANTO; Dorothé AZILINON
      Pages: 255 - 261
      Abstract: Publication date: September 2017
      Source:Case Studies in Thermal Engineering, Volume 10
      Author(s): Mohamed Izzedine Serge ADJIBADE, Ababacar THIAM, Christophe AWANTO, Dorothé AZILINON
      This work presents an experimental study of H20-NH3-H2 diffusion absorption refrigeration under two types of energy sources, i.e. the conventional electric energy from grid (electric) and exhaust gas from internal combustion engine. Dynamic method is used to evaluate the behavior of the components of the system for both energy sources. Results obtained show that the performance of each component under different types of energy sources is almost coherent. For the generator, the electrical heater system requires more time to warm up, around three minutes, compared to the 40s for system running with exhaust gas. For the evaporator, the decreasing rate is higher for the exhaust gas source and it took only about two hours to reach steady-state while for the electrical heat, the steady-state is reached after about seven hours of operation. For both energy sources, the evaporation temperature stabilizes to 3°C and the minimum temperature to boil off ammonia is around 140°C.

      PubDate: 2017-07-24T06:24:50Z
      DOI: 10.1016/j.csite.2017.07.004
      Issue No: Vol. 10 (2017)
       
  • Flame spread and smoke temperature of full-scale fire test of car fire

    • Authors: Dayan Li; Guoqing Zhu; Hui Zhu; Zhichao Yu; Yunji Gao; Xiaohui Jiang
      Pages: 315 - 324
      Abstract: Publication date: September 2017
      Source:Case Studies in Thermal Engineering, Volume 10
      Author(s): Dayan Li, Guoqing Zhu, Hui Zhu, Zhichao Yu, Yunji Gao, Xiaohui Jiang
      Full-scale experiments using two 4-door sedan passenger cars, placed side by side in the reverse direction, were carried out to establish the burning behavior and describe the spread of fire to adjacent car. The temperature was measured by thermocouples. Radiant heat flux was measured with heat flux gauge placed at a distance of 5m, at the right side of the car. Four cameras were placed inside the car and in the fire test room recording burning behavior during the test. Engine compartment was ignited by a sponge dipped with little gasoline. During the experiment, the ignition was initiated in the engine compartment of car I and approximately 20min were enough time for fire to spread into the second car. Fully-developed burning of two cars occurred at 29min. It was observed that the flame spread through car roof faster than through the bottom of car compartment. The fire followed a slow rate spread from engine compartment to car cab. The temperature inside the car peaked at the point of 900°C. The peak smoke temperatures at every location were measured at the range of 89–285°C. The smoke production at the time of 11min to 15min 50s of fire was 1.76m3/s, which was obtained through indirect calculation method.

      PubDate: 2017-09-03T07:07:05Z
      DOI: 10.1016/j.csite.2017.08.001
      Issue No: Vol. 10 (2017)
       
  • Heat management methodology for enhanced global efficiency in hybrid
           electric vehicles

    • Authors: F. Claude; H.S. Ramadan; M. Becherif; L. Boulon
      Pages: 325 - 334
      Abstract: Publication date: September 2017
      Source:Case Studies in Thermal Engineering, Volume 10
      Author(s): F. Claude, H.S. Ramadan, M. Becherif, L. Boulon
      The transportation impact on pollution and global climate change, has forced the automotive sector to search for more ecological solutions. Owing to the different properties of Fuel Cell (FC), real potential for reducing vehicles’ emissions has been witnessed. The optimization of FC integration within Electric Vehicles (EVs) is one of the original solutions. This paper presents an innovating solution of multi-stack Fuel Cell Electrical Vehicle (FCEV) in terms of efficiency, durability and ecological impact on environment. The main objective is to illustrate the interest of using the multi-stack FC system on the global autonomy, cycling, and efficiency enhancement, besides optimizing its operation performance.

      PubDate: 2017-09-03T07:07:05Z
      DOI: 10.1016/j.csite.2017.06.006
      Issue No: Vol. 10 (2017)
       
  • Thermal analysis of gas turbine disk integrated with rotating heat pipes

    • Authors: Yazan Taamneh
      Pages: 335 - 342
      Abstract: Publication date: September 2017
      Source:Case Studies in Thermal Engineering, Volume 10
      Author(s): Yazan Taamneh
      The combination of the rotating heat pipe with conventional air cooling technique can be considered as an emerging and effective cooling technique for gas turbine disk. Accordingly, the thermal steady and transient analysis of a simplified turbine disk integrated with heat pipes have been numerically investigated. The steady and transient temperature variations in the presence and absence of heat pipes were investigated for various parameter, such as the thermal conductivity of the disk, the convective heat transfer coefficient for both the air and heat pipes, the dimension of the disk, and the number of heat pipes. The thermal analysis were performed by using finite element (FE) modeling software ANSYS-17.2. The extensive numerical simulations showed that when the number of heat pipes equal to 32, the maximum temperatures at the disk edge can be decreased by more than 100 degree. Additionally, increasing the convective heat transfer coefficient of the working fluid inside the heat pipes up to 10,000W/m2.°C, the maximum temperature at the disk rim can further be reduced by more than 280 degree. It has also been observed that the time required to achieve the minimum steady-state temperature was more sensitive to the air convective heat transfer coefficient.

      PubDate: 2017-09-15T07:16:06Z
      DOI: 10.1016/j.csite.2017.09.002
      Issue No: Vol. 10 (2017)
       
  • Numerical simulation of thermal chaotic mixing in multiple rods rotating
           mixer

    • Authors: A. Ait Msaad; M. Mahdaoui; T. Kousksou; A. Allouhi; T. El Rhafiki; A. Jamil; K. Ouazzani
      Pages: 388 - 398
      Abstract: Publication date: September 2017
      Source:Case Studies in Thermal Engineering, Volume 10
      Author(s): A. Ait Msaad, M. Mahdaoui, T. Kousksou, A. Allouhi, T. El Rhafiki, A. Jamil, K. Ouazzani
      In this research work, a numerical simulation is carried out to study the performance of coupled mixing and heating generated by chaotic advection in a mixer comprising rotating rods uphold inside a cylindrical tank. The effect of the number of the rotating rods on both the chaotic advection and the thermal efficiency of the mixer is presented. It is found that the use of noncontinuous wall rotations is necessary to ameliorate the heat transfer by chaotic mixing. The increase in the number of rod within the mixer can also promote the thermal performance of the mixer.

      PubDate: 2017-11-10T14:28:12Z
      DOI: 10.1016/j.csite.2017.09.005
      Issue No: Vol. 10 (2017)
       
  • Effect of various drying bed on thermodynamic characteristics

    • Authors: Ali Motevali; Reza Amiri Chayjan
      Pages: 399 - 406
      Abstract: Publication date: September 2017
      Source:Case Studies in Thermal Engineering, Volume 10
      Author(s): Ali Motevali, Reza Amiri Chayjan
      In this study thermodynamic parameter and energy consumption in drying of two plant dill and mint in three bed drying including fix, semi fix and fluid with using a hot air drying was investigated. Experimental was conducted in three bed drying including fix, semi fix and fluid and four levels temperature (30, 40, 50 and 60°C). Maximum energy consumption in dill drying at 40°C and fluid bed to be 16.41MJ and minimum energy consumption at 30°C and fix bed to be 2.77MJ. Also minimum energy consumption in mint drying at 60°C and fix bed to be 3.64 MJ and maximum energy consumption at 40°C and fluid bed to be 28.65MJ. The highest energy, drying and thermal efficiency for both mint and dill was achieved at 60°C on the fixed bed, whereas the lowest efficiency was at 40°C and on the fluidized bed. Also the highest power and specific heat consumption for both mint and dill was achieved at 40°C on the fluid bed, whereas the lowest efficiency was at 30°C and on the fluidized bed.

      PubDate: 2017-11-10T14:28:12Z
      DOI: 10.1016/j.csite.2017.09.007
      Issue No: Vol. 10 (2017)
       
  • Direct imaging of the SSD and USB memory drives heating by thermo-elastic
           optical indicator microscopy

    • Authors: Shant Arakelyan; Hanju Lee; Yeonghun Jeong; Arsen Babajanyan; Barry Friedman; Kiejin Lee
      Pages: 407 - 412
      Abstract: Publication date: September 2017
      Source:Case Studies in Thermal Engineering, Volume 10
      Author(s): Shant Arakelyan, Hanju Lee, Yeonghun Jeong, Arsen Babajanyan, Barry Friedman, Kiejin Lee
      The visualization of mass storage controllers and flash memory chips in the USB2.0, USB3.0 and solid state device (SSD) devices was performed using a thermo-elastic optical indicator microscopy system. Heat distributions corresponding to the various operation/loading parameters such as writing block sizes were analyzed, which was showed device behavior on heating. Direct measurements of the temperature by a thermocouple were implemented in order to investigate the operation thermal states of the devices under test (DUTs) in the idle regime. Heat temperature differences dependence on loading block size (0.25kB – 64MB) was found for all DUTs. In order to explain the heat variation dependence on block size a series of measurements of the DUTs transfer rates were performed. The data transfer rate is drastically changed depending on the transferred block size (8B – 128MB), (0.2kB/s – 7MB/s), (0.3kB/s – 21MB/s), (2kB/s – 92MB/s) and (3.7kB/s – 222MB/s) for USB2.0, USB3.0, HDD, and SSD, respectively.

      PubDate: 2017-11-10T14:28:12Z
      DOI: 10.1016/j.csite.2017.09.008
      Issue No: Vol. 10 (2017)
       
  • Thermodynamic evaluation of a kerosene pre- Fraction unit using energy and
           exergy analysis

    • Authors: Ehsan Ghasemi; Saeed Yazdanei; Amir Rahimi; Mohammad Afshar
      Pages: 413 - 422
      Abstract: Publication date: September 2017
      Source:Case Studies in Thermal Engineering, Volume 10
      Author(s): Ehsan Ghasemi, Saeed Yazdanei, Amir Rahimi, Mohammad Afshar
      This work applies the method of energy and exergy analysis over first step of linear alkyl benzene (LAB) production namely kerosene pre fraction plant, to determine unit energy and exergy performance and loss, besides of opportunities for improvement based on operational data. For this purpose macroscopic energy and exergy balance was developed over main equipment including electro pumps, heat exchangers, air coolers, and distillation columns. The results shows that total energy performance of plant is 92.62% by 19.76MW energy lost, while from exergy perspective, unit performance is 78.08% by 17.92MW exergy lost. Maximum local exergy lost occurs in the feed pre heater exchanger by 27% performance which is designed to recover energy from top product of second column, furthermore results shows that upgrading low quality energy in air coolers based on heat pump concept would protect energy and exergy emission to the environment and reduce 40% of total lost energy and 16% of total lost exergy in plant.

      PubDate: 2017-11-10T14:28:12Z
      DOI: 10.1016/j.csite.2017.09.004
      Issue No: Vol. 10 (2017)
       
  • Measurements and theoretical modeling of effective thermal conductivity of
           particle beds under compression in air and vacuum

    • Authors: Jingwen Mo; Heng Ban
      Pages: 423 - 433
      Abstract: Publication date: September 2017
      Source:Case Studies in Thermal Engineering, Volume 10
      Author(s): Jingwen Mo, Heng Ban
      Effective thermal conductivity experiments were carried out with spherical particle beds under low and high compressive pressure loading in vacuum and air. A theoretical model was proposed for the effective thermal conductivity of particle beds based on the experimental results. The model incorporates heat conduction by particles including contact thermal resistance between particles, conduction through the gas in between particles, and radiation between particles, and includes two fitting parameters, namely the coefficient of heat conducted through the fluid, and the macro-contact thermal resistance. The predictions from the theoretical model satisfactorily match the experimental data for the bed effective thermal conductivity over the range of applied loading pressures on particles with different Young's modulus and the gas environment. The model can be used generally to describe the effect of compression stress or pressure on effective thermal conductivity of particle beds.

      PubDate: 2017-11-10T14:28:12Z
      DOI: 10.1016/j.csite.2017.10.001
      Issue No: Vol. 10 (2017)
       
  • Novel Technique for Enhancement of Diesel Fuel: Impact of Aqueous Alumina
           Nano-Fluid on Engine's Performance and Emissions

    • Authors: Miqdam Tariq Chaichan; Abdul Amir H. Kadhum; Ahmed A. Al-Amiery
      Abstract: Publication date: Available online 15 November 2017
      Source:Case Studies in Thermal Engineering
      Author(s): Miqdam Tariq Chaichan, Abdul Amir H. Kadhum, Ahmed A. Al-Amiery
      Nanofluids are suspensions of nanoparticles mixed in liquids and show significant enhancement in some thermophysical and combustion properties of the resulting suspension. In this study, the changes in the performance and emissions characteristics of a conventional diesel engine are verified experimentally using the combustion of a mixture of nanofluid (water and Al2O3) and conventional Iraqi diesel fuel. The nano-Al2O3 (51nm diameter) was used in this study; multiple weight ratios of this nanoparticle were mixed with water to form a nanoparticle suspension. The weight fractions used were 1, 3, 5, 7, and 10%. After that, a fixed volume ratio of the resulting suspension (10%) was added to the diesel and completely mixed. The results indicate that the addition of the nano-alumina-water suspension has increased the brake thermal efficiency up to 5.5%, and reduced the relative fuel consumption up to 3.94%, compared to diesel fuel. In the analysis of emitted exhaust emissions, CO, HC, NOx, PM and noise emissions, they were found to be lower than diesel fuel, while CO2 emissions increased.

      PubDate: 2017-11-17T16:01:45Z
      DOI: 10.1016/j.csite.2017.11.006
       
  • Effect of Variable Lorentz forces on Nanofluid Flow in movable Parallel
           Plates utilizing Analytical Method

    • Authors: Kh. Hosseinzadeh; A.Jafarian Amiri; S.Saedi Ardahaie; D.D. Ganji
      Abstract: Publication date: Available online 11 November 2017
      Source:Case Studies in Thermal Engineering
      Author(s): Kh. Hosseinzadeh, A.Jafarian Amiri, S.Saedi Ardahaie, D.D. Ganji
      The present paper focuses on the examination of the effect of Brownian motion and thermophoresis phenomenon and Lewis number on MHD nanofluid flow along with the heat transfer between two parallel plates. Utilizing a suitable transformation for the velocity, temperature and concentration, the basic governing equations of the flow, heat and mass transfer were reduced to a set of ordinary differential equations. After the governing equation is derived; various analytical methods such as Homotopy Perturbation Method (HPM), Collocation Method (CM) and Finite Element Method (FEM) are applied to deal with the problem. The obtained Results revealed that Collocation Method (CM) has an excellent agreement with Finite Element numerical method, so it can be a proper analytical method for solving the problem. Then the influence of the following parameters is investigated: Brownian motion parameter (Nb), thermophoresis parameter (Nt), Squeeze number (S), Hartmann number (M) and Lewis number (Le) on non-dimensional temperature, velocity and nanoparticle concentration. The results indicated that increasing the Brownian motion parameter would cause an increase in temperature profile while the effect of increasing Brownian motion on concentration profile is vice versa, moreover, by increasing the Thermophoresis parameter we would have a decreases in temperature profile and an increase in concentration profile.

      PubDate: 2017-11-17T16:01:45Z
      DOI: 10.1016/j.csite.2017.11.001
       
  • Distribution of the temperature in the coaxial tube heat Exchanger with
           spherical end

    • Authors: Dhahri Imen; Lotfi Ammar
      Abstract: Publication date: Available online 11 November 2017
      Source:Case Studies in Thermal Engineering
      Author(s): Dhahri Imen, Lotfi Ammar
      A solution is presented for flow inside a heat exchanger. An analytical approach is developed and validated with a numerical simulation using ANSYS CFX code module taking account different boundary condition in the inlet. The temperature distribution of the laminar flow is presented, which is related to Reynolds number and the hydraulic diameter of the heat exchanger.

      PubDate: 2017-11-17T16:01:45Z
      DOI: 10.1016/j.csite.2017.11.003
       
  • OPTIMIZATION OF CAPILLARY TUBE DIMENSIONS USING DIFFERENT REFRIGERANTS FOR
           1.5 TON MOBILE AIR CONDITIONER

    • Authors: Kasuba Sainath; T. Kishen Kumar Reddy; Suresh Akella
      Abstract: Publication date: Available online 25 October 2017
      Source:Case Studies in Thermal Engineering
      Author(s): Kasuba Sainath, T. Kishen Kumar Reddy, Suresh Akella
      Capillary tube is one of the commonly used throttling devices in the refrigeration and the air conditioning systems. The capillary tube is made up of copper tube of very small internal diameter. It is of very long length and it is coiled to several turns so that it occupies less space. The internal diameter of the capillary tube used for the refrigeration and AC applications varies from 0.5 to 2.28 mm (0.020 to 0.09 in.). Capillary tube used as the throttling device in the refrigerators, deep freezers, water coolers and air conditioners The objective of this research was to evaluate the optimum size of a capillary tube dimensions in a Air Conditioning system and to determine the Pressure drop across the capillary tube. The optimization was determined by mathematical calculation to evaluate increment length.

      PubDate: 2017-11-02T11:43:05Z
      DOI: 10.1016/j.csite.2017.10.005
       
  • Effects of Pressure Work, Viscous Dissipation, Shear Work and Axial
           Conduction on Convective Heat Transfer in a Microtube

    • Authors: K.M. Ramadan
      Abstract: Publication date: Available online 13 September 2017
      Source:Case Studies in Thermal Engineering
      Author(s): K.M. Ramadan
      This paper investigates the effects of viscous dissipation, pressure work, shear work, rarefaction and axial heat diffusion on convective heat transfer in a microtube gaseous flow. The problem is investigated numerically for the whole flow region using a finite difference scheme and the line Gauss-Seidel iterative technique. Exact solutions of the problem in terms of temperature distribution and Nusselt number variations are also derived under fully developed flow conditions. The microtube is assumed to be sufficiently long, so that fully developed conditions are established. The analysis presented demonstrate that the effect of the boundary shear work is significant and its contribution to heat transfer can be as high as that due to heat conduction close to the upper limit of the slip flow regime. As the shear work is a result of the combined effects of viscous dissipation and pressure work at the boundary, including these effects in the analysis leads to better predictions of heat transfer phenomena. Axial heat diffusion effect on Nusselt number and the thermal entrance length are also quantified.

      PubDate: 2017-09-15T07:16:06Z
      DOI: 10.1016/j.csite.2017.09.001
       
  • Experimental and numerical investigation of cylindrical storage collector
           (case study)

    • Authors: Omer Khalil Ahmed
      Abstract: Publication date: Available online 12 September 2017
      Source:Case Studies in Thermal Engineering
      Author(s): Omer Khalil Ahmed
      An empirical and theoretical investigation was achieved on a cylindrical storage collector. It was suggested in this work for a cylinder to be cut at an inclined cutting plane. The tests were achieved for both summer and winter climate conditions with and without hot water removal. The hourly system performance parameters were investigated systematically for different experiments. These included the average storage temperature, velocity distribution, and temperature distribution. In the cylindrical collector, the ultimate magnitude of the average storage temperature was 25°C, while the maximum temperature at the tip of the cylindrical collector was 58°C for a typical spring day. Meanwhile, the rectangular collector can warm up the stored water to a temperature of 23°C, when the inlet water temperature was 12°C. The performance of the new solar collector was, in general, similar to the performance of the conventional thermosyphon flat plate solar water heaters. The Fluent program was used to confirm the experimental results. The free convection in the cylindrical collector was investigated based on the method of control volume. From the Fluent data and analysis of the collector, the temperature and velocity distributions throughout the day were obtained. The Fluent program data was well compatible with the experimental results.

      PubDate: 2017-09-15T07:16:06Z
      DOI: 10.1016/j.csite.2017.09.003
       
  • Conversion analysis of a cylindrical biomass particle with a DEM-CFD
           coupling approach

    • Authors: Mohammad Mohseni; Bernhard Peters; Mehdi Baniasadi
      Abstract: Publication date: Available online 6 September 2017
      Source:Case Studies in Thermal Engineering
      Author(s): Mohammad Mohseni, Bernhard Peters, Mehdi Baniasadi
      Biomass as a renewable energy source has attracted more attention nowadays due to ecological and economical benefits. The main objective of this work is studying the biomass conversion with employing a DEM-CFD coupling approach. In this model, the solid particulates are considered as discrete elements coupled via heat, mass and momentum transfer to the surrounding gas as continuous phase. That is, a comprehensive three-dimensional numerical model is developed and applied to investigate the complex phenomena taking place during biomass conversion in a reactor. In this case, the physical and chemical processes as heat-up, drying, pyrolysis, gasification and combustion are taken into account based on the relevant homogeneous and heterogeneous reactions. This platform predicts the motion of discrete particles based on the newton's equations of motion; and the thermodynamic state of each particle is extended according to the related algorithms. The thermodynamic state estimates the temperature and species distributions inside the particle due to external heat sources and chemical reactions. The reaction rates are described with Arrhenius model, and the reactions in the gas phase are modeled using Partially Stirred Reactor (PaSR) model with the standard k − ϵ turbulent model. The conductive and radiative heat transfer between particles as well as convective heat transfer between particles and gas phase are also observed. Due to layered behavior of biomass materials, the shape of particle is considered as cylindrical rather than spherical to predict more realistic results. In order to improve the numerical modeling of biomass conversion, a shrinkage model is also developed and validated with experimental data in literature.

      PubDate: 2017-09-09T07:11:18Z
      DOI: 10.1016/j.csite.2017.08.004
       
  • ENERGY CONSERVATION IN DOMESTIC REFRIGERATORS BY COOLING COMPRESSOR SHELL
           -A CASE STUDY

    • Authors: N. Nethaji; Tharves Mohideen
      Abstract: Publication date: Available online 24 August 2017
      Source:Case Studies in Thermal Engineering
      Author(s): N. Nethaji, Tharves Mohideen
      Application of energy efficient compressors, air handling units (AHUs), condensers and evaporators of high effectiveness are the some of the measures towards energy conservation in refrigeration systems. Cooling of compressor shell with the defrost drips is an energy saving measure which is explored in this paper. In tropical countries which have 70 to 80% RH year round, the quantity of defrost formation is significant while refrigeration systems are on. This defrost water is dripped on the compressor's shell, which in turn cools the compressor oil and hence reduces the friction losses and winding temperature of the motor. Once winding temperature is reduced the compressor's ampere rating is reduced which ultimately reduces the energy consumption of the compressor. For given conditions of refrigerator function, the compressor shell temperature and ampere rating of compressor are tabulated and investigated before and after compressor shell cooling. The investigation reveals that around 8–10% energy savings are achieved for the given conditions.

      PubDate: 2017-09-03T07:07:05Z
      DOI: 10.1016/j.csite.2017.08.002
       
  • Production of Valuable Pyrolytic Oils from Mixed Municipal Solid Waste
           (MSW) in Indonesia using Non-Isothermal and Isothermal Experimental

    • Authors: Indra Mamad Gandidi; M. Dyan Susila; Nugroho Agung Pambudi
      Abstract: Publication date: Available online 24 August 2017
      Source:Case Studies in Thermal Engineering
      Author(s): Indra Mamad Gandidi, M. Dyan Susila, Nugroho Agung Pambudi
      Municipal solid waste (MSW), disposed of at open dumping sites, poses health risks, contaminates surface water, and releases greenhouse gasses such as methane. However, pyrolysis offers the opportunity to convert MSW into Bio-Oil (BO) for clean energy resource. In this paper, an MSW sample consisting of plastic, paper and cardboard, rubber and textiles, and vegetable waste is pyrolysed on a laboratory scale in a fixed-bed vacuum reactor. In the non-isothermal process, the sample was fed into the reactor and then heated. In the isothermal process, the reactor is first heated and then the sample is added. The non-isothermal process created greater BO in both quality and quantity. The BO had a larger amount of gasoline species than diesel-48 fuel, with at 33.44%the BO produced by isothermal pyrolysis and 36.42% in non-isothermal pyrolysis. However the product of isothermal pyrolysis had a higher acid content that reduced its heating value.

      PubDate: 2017-09-03T07:07:05Z
      DOI: 10.1016/j.csite.2017.08.003
       
  • Preliminary Analysis of Dry-Steam Geothermal Power Plant by Employing
           Exergy Assessment: Case Study in Kamojang Geothermal Power Plant,
           Indonesia

    • Authors: Bayu Rudiyanto; IbnuAtho Illah; Nugroho Agung Pambudi; Chin-Chi Cheng; Reza Adiprana; Muhammad Imran; Lip Huat Saw; Renanto Handogo
      Abstract: Publication date: Available online 22 July 2017
      Source:Case Studies in Thermal Engineering
      Author(s): Bayu Rudiyanto, IbnuAtho Illah, Nugroho Agung Pambudi, Chin-Chi Cheng, Reza Adiprana, Muhammad Imran, Lip Huat Saw, Renanto Handogo
      The objectives of this study are to perform the exergy analysis and ambient temperature optimization of the Kamojang geothermal power plant by employing Engineering Equation Solver (EES). The geothermal capacity is 55MW and the field is vapor-dominated reservoir with temperature 245°C. In the innitial state temperature, pressure and mass flow data are collected from the plant operation. The study results show that system has overall efficiency of 35.86% which means that only 111,138.92 KW electrical power can be extracted from 309,000 KW thermal power being produced by 10 production wells of Kamojang. This low efficiency is due to irreversibility associated with different processes and components in the system. The largest irreversibility occurs in condenser due to which 53% of total energy is disposed into the environment. Ambient temperature at Kamojang varies from 17–20°C. The effect of this variation in temperature is also investigated and it is observed that higher temperature does not have any significant impact on system efficiency.

      PubDate: 2017-07-24T06:24:50Z
      DOI: 10.1016/j.csite.2017.07.006
       
  • Case study for experimental validation of a new presizing tool for solar
           heating, cooling and domestic hot water closed systems

    • Authors: Hamza Semmari; Amandine LeDenn; François Boudéhenn; Jean-Philippe Praene; Franck Lucas; Olivier Marc
      Abstract: Publication date: Available online 19 July 2017
      Source:Case Studies in Thermal Engineering
      Author(s): Hamza Semmari, Amandine LeDenn, François Boudéhenn, Jean-Philippe Praene, Franck Lucas, Olivier Marc
      This paper presents a case study experimental validation of PISTACHE which is a new presizing tool intended for designers and planners. It facilitates pre-design and allows the evaluation of annual performance and the integration potential of solar heating, cooling and domestic hot water closed systems. This new tool has been performed in order to standardize the sizing methodology and the comparison of the SHC&DHW closed systems. The comparison framework used in PISTACHE has been performed using seasonal performance indicators that were issued and gathered from experimental data provided by several operating plants. Thus, PISTACHE is an easy graphical user interface and free downloadable tool. In order to check the reliability of the new developed tool, two configuration modes are investigated in this experimental study: a simple cooling mode (RAFSOL plant) and a double cooling and heating mode (SONNENKRAFT installation). The whole validation process is performed using the GenOpt optimization program to determine the optimum set of internal parameters for PISTACHE tool.

      PubDate: 2017-07-24T06:24:50Z
      DOI: 10.1016/j.csite.2017.07.007
       
  • Investigation of combined effects of compression ratio and steam injection
           on performance, combustion and emissions characteristics of HCCI engine

    • Authors: Fridhi Hadia; Soua Wadhah; Hidouri Ammar; Omri Ahmed
      Abstract: Publication date: Available online 18 July 2017
      Source:Case Studies in Thermal Engineering
      Author(s): Fridhi Hadia, Soua Wadhah, Hidouri Ammar, Omri Ahmed
      Combined effects of compression ratios and steam injection on performance, combustion and emission characteristics of a HCCI engine are numerically investigated. The pollutant emission is controlled by the dilution of the reactant by steam injection. Combustion is performed by using the Internal Combustion Engine (ICE) model. For model assessment, computed results are compared to the published data available in the literature obtained with same boundary conditions. An overall satisfactory agreement is reported. Three values of steam injection ratio are tested. Results show that the performance of the HCCI engine is very low if the steam injection exceed 20%.

      PubDate: 2017-07-24T06:24:50Z
      DOI: 10.1016/j.csite.2017.07.005
       
  • Mutual effects of thermal radiations and thermal stratification on tangent
           hyperbolic fluid flow yields by both cylindrical and flat surfaces

    • Authors: Khalil Ur Rehman; Aneeqa Ashfaq Malik; M.Y. Malik; Noor Ul Saba
      Abstract: Publication date: Available online 11 July 2017
      Source:Case Studies in Thermal Engineering
      Author(s): Khalil Ur Rehman, Aneeqa Ashfaq Malik, M.Y. Malik, Noor Ul Saba
      The characteristics of tangent hyperbolic fluid flow in the presence of both thermal radiation and thermal stratification effects are not discussed until now especially by way of an inclined cylindrical surface. Therefore, an endeavour as a comparative study is reported to offered numerical solution for tangent hyperbolic fluid model towards both cylindrical and flat stretching surfaces. The physical situation which also includes the noteworthy effects namely, stagnation point region, mixed convection, magnetic field individualities and heat generation is translated in terms of partial differential equations and for solution purpose a computational algorithm is executed. The obtained results are provided by way of both graphical and tabular outcomes. It is observed that the temperature profile is an increasing function of thermal radiation parameter but opposite trends are noticed for positive values of thermal stratification parameter. In addition, straight line approximation is accomplished to scrutinize the impact of mixed convection and an inclination effects on skin friction coefficient while the impact of thermal radiation and thermal stratification parameters are provided on heat transfer rate.

      PubDate: 2017-07-12T05:51:43Z
      DOI: 10.1016/j.csite.2017.07.003
       
  • Performance and emission characteristics of a small diesel engine run in
           dual-fuel (diesel-biogas) mode

    • Authors: Himsar Ambarita
      Abstract: Publication date: Available online 20 June 2017
      Source:Case Studies in Thermal Engineering
      Author(s): Himsar Ambarita
      A small compression ignition (CI) engine with a rated power of 4.41kW has been tested in dual-fuel (diesel-biogas) mode without any significant modification. The objectives are to explore the effects of biogas flow rate and methane concentration on the performance and emissions of the CI engine run in dual-fuel mode. The experiments have been carried out at engine load and speed vary from 1000rpm to 1500rpm and 600W to 1500W, respectively. The results show that the output power and specific fuel consumption of the CI engine run in dual-fuel mode are higher than the CI engine run in pure diesel mode. Brake thermal efficiency of the CI engine run in dual-fuel mode strongly affected by biogas flow rate and methane concentration. There exists an optimum biogas flow rate for a maximum brake thermal efficiency. The biogas can reduce the diesel fuel consumption significantly. In the present CI engine, diesel replacement ratio varies from 15.3% to 87.5%. At engine load and speed of 1500W and 1500rpm, to get maximum efficiency, the present CI engine should be operated at biogas energy ratios of 15% and 18% using biogas with 60% and 70% methane concentrations, respectively.

      PubDate: 2017-06-22T06:57:25Z
      DOI: 10.1016/j.csite.2017.06.003
       
  • Hourly Soil Temperature and Moisture Content Variations within a Concrete
           Pipe Container for Planting Lime Trees in Eastern Thailand

    • Authors: Worasitti Sriboon; Usavadee Tuntiwaranuruk; Niwat Sanoamuang
      Abstract: Publication date: Available online 19 June 2017
      Source:Case Studies in Thermal Engineering
      Author(s): Worasitti Sriboon, Usavadee Tuntiwaranuruk, Niwat Sanoamuang
      The use of concrete pipe containers for planting is becoming widely popular in Thailand because the essential soil physical environments for plant growth can easily be controlled. In this paper, we aimed to investigate the soil temperature and moisture content variations under Eastern Thailand climate throughout the soil within a concrete pipe, which applies to lime trees culture. Concrete pipes of 80cm diameter and 40cm height, and 1-year-old and 2-year-old lime trees were conducted. Soil temperature and moisture content at the depths of soil surface, 10cm, 20cm, 30cm, and 40cm were measured hourly during the day. The results show that average soil temperature and moisture content are different in all depths. Soil temperature at the surface was found to be higher during day time while lower during night time. The study also reveals that soil temperature decreases with depth at day time and vice-versa at night. Soil moisture content variations was found to be related to the canopy size of the trees. The preliminary data could be used for imposing fertigation regimes, soil moisture regime or different nutrient regime within concrete pipe containers for planting lime trees.

      PubDate: 2017-06-22T06:57:25Z
      DOI: 10.1016/j.csite.2017.06.005
       
  • Experimental Measurement of Hermetic Edge Seal's Thermal Conductivity for
           the Thermal Transmittance Prediction of Triple Vacuum Glazing

    • Authors: Saim Memon
      Abstract: Publication date: Available online 15 June 2017
      Source:Case Studies in Thermal Engineering
      Author(s): Saim Memon
      Thermal conductivity of hermetic edge-sealing materials plays an important part in the thermal transmittance (U-value) of the triple vacuum glazing. Thermal conductivity of Cerasolzer CS186 alloy and J-B Weld epoxy-steel resin were measured and validated with the mild-steel and indium using transient plane source method with a sensor element of double spiral and resistance thermometer in a hot disk thermal constants analyser TPS2500s are reported. The thermal conductivity data of Cerasolzer CS186 alloy and J-B Weld epoxy steel resin were measured to be 46.49 Wm−1K−1 and 7.47 Wm−1K−1, with the deviations (using analytical method) of ±4% and ±7% respectively. These values were utilised to predict the thermal transmittance value of triple vacuum glazing using 3D finite element model. The simulated results show the centre-of-glass and total U-value of 300mmx300mm triple vacuum glazing to be 0.33Wm−2K−1 and 1.05 Wm−2K−1, respectively. The influence of such a wide edge seal on the temperature loss spreading from the edge to the central glazing area is analysed, in which the predictions show wider edge seal has affected the centre-of-glass U-value to 0.043 Wm−2K−1 due to the temperature gradient loss spread to 54 mm and 84 mm on the cold and warm side respectively.

      PubDate: 2017-06-16T21:48:44Z
      DOI: 10.1016/j.csite.2017.06.002
       
  • New hybrid system combining TEG, Condenser Hot Air and Exhaust Airflow of
           All-Air HVAC Systems

    • Authors: Mohamad Ramadan; Samer Ali; Hasan Bazzi; Mahmoud Khaled
      Abstract: Publication date: Available online 25 May 2017
      Source:Case Studies in Thermal Engineering
      Author(s): Mohamad Ramadan, Samer Ali, Hasan Bazzi, Mahmoud Khaled
      One of the most promising solution for the current energy crisis is recovering lost energy. Indeed, in many energy systems the percentage of energy loss could exceed 60%. To put it another way, in some applications, recovering energy is as much beneficial as finding new source of energy. Moreover, finding new concepts of energy recovery offers wider horizons to reduce energy consumption. The present work investigates new energy recovery system that combines heat recovery and energy generation using thermoelectric generators (TEG). The proposed system is a triple Thermoelectric-Energy recovery coupled system that from one hand allows to recover the heat of condenser and to reuse the lost energy of exhaust airflow of HVAC all-air system and from the other hand it permits to produce green electricity using TEG. The air of the condenser is considered the heat source, whereas the exhaust air flow is utilized as cooler. To proceed, a mathematical tool is first developed it allows to thermally simulate TEGs for different boundary conditions. The heat and cold source are then modeled where the heat transfer coefficient is determined from the Nusselt number. Furthermore, a parametric analysis is then conducted to evaluate the power generated with the new concept when the air velocity of the exhaust airflow and that of the condenser vary. It is shown that for a space cooling load of 100kW, a 40×40cm² flat plate is capable to generate 90W of electrical power.
      Graphical abstract image

      PubDate: 2017-05-27T20:13:31Z
      DOI: 10.1016/j.csite.2017.05.007
       
  • Research on heat transfer characteristic of crude oil during the tubular
           heating process in the floating roof tank

    • Authors: Jian Zhao; Hang Dong; Xiulian Wang; Xiaoming Fu
      Abstract: Publication date: Available online 25 May 2017
      Source:Case Studies in Thermal Engineering
      Author(s): Jian Zhao, Hang Dong, Xiulian Wang, Xiaoming Fu
      By means of finite volume method, the heat transfer characteristic of crude oil under the tubular heating in the floating roof tank is investigated by numerical simulation. The evolution of temperature profile and its relationship with the flow pattern is presented in detail. A noticeable finding is that there exists the transformation of the flow pattern which affects the temperature profile apparently during the heating process. Special concern is taken on the evolution of temperature distribution on the interface between oil and the inner wall of the tank. The temperature profile on the top wall, sidewall and base wall of the tank is investigated. It is concluded that the plume induced by natural convection takes most responsibility for the formation of temperature field in the tank. The second factor is the boundary condition of the tank.

      PubDate: 2017-05-27T20:13:31Z
      DOI: 10.1016/j.csite.2017.05.006
       
  • Modeling and performance simulation of 100MW PTC based solar thermal power
           plant in Udaipur India

    • Authors: Deepak Bishoyi; K. Sudhakar
      Abstract: Publication date: Available online 24 May 2017
      Source:Case Studies in Thermal Engineering
      Author(s): Deepak Bishoyi, K. Sudhakar
      Solar energy is a key renewable energy source and the most abundant energy source on the globe. Solar energy can be converted into electric energy by using two different processes: by means of photovoltaic (PV) conversion and the thermodynamic cycles. Concentrated solar power (CSP) is viewed as one of the most promising alternatives in the field of solar energy utilization. Lifetime and efficiency of PV system are very less compared to the CSP technology. A 100MW parabolic trough solar thermal power plant with 6 h of thermal energy storage has been evaluated in terms of design and thermal performance, based on the System Advisor Model (SAM). A location receiving an annual DNI of 2248.17 kWh/m²/year, in Rajasthan is chosen for the technical feasibility of hypothetical CSP plant. The plant design consists of 194 solar collector loops with each loop comprising of 8 parabolic trough collectors. HITEC solar salt is chosen as an HTF due to its excellent thermodynamic properties. The designed plant can generate annual electricity of 285,288,352 kWh with the plant efficiency of 21%. The proposed design of PTC based solar thermal power plant and its performance analysis encourages further innovation and development of solar thermal power plants in India.

      PubDate: 2017-05-27T20:13:31Z
      DOI: 10.1016/j.csite.2017.05.005
       
  • Experimental Study of Flow through Compressor Cascade

    • Authors: Satyam Panchal; Vijay Mayavanshi
      Abstract: Publication date: Available online 9 May 2017
      Source:Case Studies in Thermal Engineering
      Author(s): Satyam Panchal, Vijay Mayavanshi
      The objective of this research work is to study the behaviour of flow at the inlet, within the blade passage and at the exit of a compressor cascade. For this purpose, a cascade with six numbers of aerofoil blades was designed and constructed. The cascade was fitted on the cascade test tunnel. Out of six blades two were instrumented for measuring the pressure distribution on the pressure and suction surface. The blades had a parabolic camber line, with a maximum camber position at 40% of the chord from the leading edge of the blade. The profile of the blade was C4, height of the blade was 160 mm, chord length was 80 mm, camber angle was 450 and stagger angle was 300. Similarly, the length of the cascade was 300 mm, span was 160 mm, pitch was 60 mm, the actual chord of the cascade was 80 mm, the axial chord of the cascade was 70 mm, the stagger angle of the cascade was 300 and the pitch-chord ratio was 0.75. The data was taken and analyzed at −500% of the axial chord before the cascade, −25% of the axial chord before the leading edge, 25%, 50%, 75% and 150% of the axial chord from the leading edge of the blade. The readings were taken from the cascade wall to the mid span position along the pitch wise direction. The angle of incidence was also changed during the experiment and varied from i= −500, −300, −100 to 50.

      PubDate: 2017-05-12T18:01:52Z
      DOI: 10.1016/j.csite.2017.05.002
       
  • NUMERICAL MODELLING OF A FUEL DROPLET FOR THE EVALUATION OF IGNITION
           TEMPERATURE CONSIDERING TRANSPORT PROPERTIES

    • Authors: Gautam Edara; Y.V.V.S.N. Murthy; K.V. Sharma; Sunitaho Pullela
      Abstract: Publication date: Available online 4 May 2017
      Source:Case Studies in Thermal Engineering
      Author(s): Gautam Edara, Y.V.V.S.N. Murthy, K.V. Sharma, Sunitaho Pullela
      An analytical method is proposed to estimate the ignition time of the fuel droplet injected in to the combustion chamber of an I.C. engine. The first phase of analysis related to the case of thermal conservation to raise its temperature up to the ignition temperature with non-vaporization from its spherical surface. The ignition temperature depends on the fuel characteristics like specific heat, density, vapor pressure, thermal conductivity, latent heat etc. Subsequently, the mass diffusion of the vapors is included in the investigation. The non –dimensional parameter Fourier number Fo is associated with mass diffusion of vapor from the spherical surface π m , the convective heat transfer π h and the thermal radiation π ε from the compressed medium are observed to be the significant criteria in determining the ignition time. For a range of parameters analyzed the ignition time is observed to be a fraction of second. The results show that the term dimensionless radius R + decreases with increase in Fourier number. Further a correlation is established between the non-dimensional numbers Fourier number and π m , π h , π ε T i g + , R + of the droplet to predict the ignition time is proposed based on the physical configuration of the droplet.

      PubDate: 2017-05-08T17:43:12Z
      DOI: 10.1016/j.csite.2017.05.001
       
  • Performance Analysis of Solar Air Heater with Jet Impingement on
           Corrugated Absorber Plate

    • Authors: Alsanossi M. Aboghrara; B.T.H.T Baharudin; M.A. Alghoul; Nor Mariah Adam; Abdul Aziz Hairuddin; Husam A. Hasan
      Abstract: Publication date: Available online 4 May 2017
      Source:Case Studies in Thermal Engineering
      Author(s): Alsanossi M. Aboghrara, B.T.H.T Baharudin, M.A. Alghoul, Nor Mariah Adam, Abdul Aziz Hairuddin, Husam A. Hasan
      This paper deals with the experimental investigation outlet temperature and efficiency, of Solar Air heater(SAH). The experimental test set up designed and fabricated to study the effect of jet impingement on the corrugated absorber plate, through circular jets in a duct flow of solar air heater, and compared with conventional solar air heater on flat plat absorber.. Under effect of mass flow rate ( m ̇ ) of air and solar radiation on outlet air temperature, and efficiency, are analyzed. Results show the flow jet impingement on corrugated plat absorber is a strong function of heat transfer enhancement. The present investigation concludes that the mass flow rate of air substantially influences the heat transfer on solar air heaters. And the thermal efficiency of proposed design duct is observed almost 14% more as compare to the smooth duct. At solar radiation 500–1000 (W/M2), 308K ambient temperature and 0.01–0.03(Kg/S) mass flow rate

      PubDate: 2017-05-08T17:43:12Z
      DOI: 10.1016/j.csite.2017.04.002
       
  • Investigation of baffle configuration effect on the performance of exhaust
           mufflers

    • Authors: Ahmed Elsayed; Christophe Bastien; Steve Jones; Jesper Christensen; Humberto Medina; Hassan Kassem
      Abstract: Publication date: Available online 28 March 2017
      Source:Case Studies in Thermal Engineering
      Author(s): Ahmed Elsayed, Christophe Bastien, Steve Jones, Jesper Christensen, Humberto Medina, Hassan Kassem
      Using baffles in exhaust mufflers is known to improve their transmission loss. The baffle cut ratio should affect the muffler performance analogous to a shell-and-tube heat exchanger. To the authors’ knowledge, there is no previous assessment reported in literature of the effects that the baffle cut ratio configuration has on acoustic response and back pressure. This investigation presents a parametric study on the effect of baffle configuration on transmission loss and pressure drop predicted. The effect of (i) the baffle cut ratio and baffle spacing, (ii) the number of baffle holes, and (iii) the hole distribution for their effect on transmission loss was investigated. Results show that decreasing the baffle cut ratio tends to increase the transmission loss at intermediate frequencies by up to 45%. Decreasing the spacing between muffler plates was shown to enhance the muffler transmission loss by 40%. To assess the baffle effect on flow, the OpenFoam CFD libraries were utilized using the thermal baffle approach model. Baffles were found to cause sudden drop in fluid temperature in axial flow direction. The outlet exhaust gases temperature was found to decrease by 15% as the baffle cut ratio changed from 75% to 25%.

      PubDate: 2017-04-04T18:30:13Z
      DOI: 10.1016/j.csite.2017.03.006
       
  • Optimal and critical values of geometrical parameters of shell and
           helically coiled tube heat exchangers

    • Authors: Ashkan Alimoradi
      Abstract: Publication date: Available online 23 March 2017
      Source:Case Studies in Thermal Engineering
      Author(s): Ashkan Alimoradi
      In the present study, calculations of the heat transfer and entropy generation were performed for steady state forced convection heat transfer in shell and helically coiled tube heat exchangers. The effect of geometrical parameters of the heat exchanger including: tube diameter (dt), coil diameter (dc), diameter of the inlet of shell (dv), shell diameter (dsh), height of coil (Hc), height of shell (Hsh), pitch (p) and the distance between the inlet and outlet of the shell (f) on the heat transfer rate and entropy generation was investigated Simultaneously. The critical and optimal values of this parameters were obtained which minimize and maximize the COD (heat transfer rate per entropy generation), respectively.

      PubDate: 2017-03-27T16:40:11Z
      DOI: 10.1016/j.csite.2017.03.003
       
  • Multiphysics Simulations of Thermoelectric Generator Modules with Cold and
           Hot Blocks and Effects of Some Factors

    • Authors: W Li; M C Paul; A Montecucco; J Siviter; A R Knox; T Sweet; M Gao; H Baig; T K Mallick; G Han; D H Gregory; F Azough; R Freer
      Abstract: Publication date: Available online 23 March 2017
      Source:Case Studies in Thermal Engineering
      Author(s): W Li, M C Paul, A Montecucco, J Siviter, A R Knox, T Sweet, M Gao, H Baig, T K Mallick, G Han, D H Gregory, F Azough, R Freer
      Transient and steady-state multiphysics numerical simulations are performed to investigate the thermal and electrical performances of a thermoelectric generator (TEG) module placed between hot and cold blocks. Effects of heat radiation, leg length and Seebeck coefficient on the TEG thermal and electrical performances are identified. A new correlation for the Seebeck coefficient with temperature is proposed. Radiation effect on the thermal and electric performances is found to be negligible under both the transient and steady-state conditions. The leg length of TEG module shows a considerable influence on the electrical performance but little on the thermal performance under the transient condition. A nearly linear temperature profile on a leg of the TEG module is identified. The temperature profile on the substrate surfaces is non-uniform, especially in the contacted areas between the straps (tabs) and the substrates.

      PubDate: 2017-03-27T16:40:11Z
      DOI: 10.1016/j.csite.2017.03.005
       
  • Investigation of intercooler-effectiveness on exergo-economic and
           exergo-sustainability parameters of modified Brayton cycles

    • Authors: Fidelis.I. Abam; Tobinson A. Briggs; Ekwe. B. Ekwe; Samuel O Effiom
      Abstract: Publication date: Available online 3 March 2017
      Source:Case Studies in Thermal Engineering
      Author(s): Fidelis.I. Abam, Tobinson A. Briggs, Ekwe. B. Ekwe, Samuel O Effiom
      The paper investigates the variants of intercooler effectiveness on exergo-economic and exergo-sustainability indicators of modified Brayton cycles. The objective is to ascertain how the variant in the intercooler effectiveness affects the exergy-based parameters. However, to achieve this, a component by component exergy-cost balances was established. The considered cycles include: the non-specific cycle (Case 1) comprising a gas turbine (GT), intercooler (IC), heat exchanger (HE) and reheat system (REH), others include (GT+H+REH +ST, Case 2), (GT+HE +IC +REH +ST+FWH, Case 3) and (GT+HE+IC+REH +ST+2 FWH, Case 4). The calculated cycle efficiencies (Cases 1 to 4) varies from 17.59 to 28.84% for intercooler effectiveness of 0.75 and 0.95. The exergy destruction within this range was 0.97%, 1.26%, 0.89% and 1.23% (Cases 1, 2 3 and 4) respectively. The component exergy destruction cost (CEDC) fluctuated between 3   . 85 ≤ CEDC ≤ 229 . 1 $ / hr ,   5 . 61 E − 06 ≤ CEDC ≤ 229 . 1 $ / h ,   1 . 46 E − 06 ≤ CEDC ≤ 229 . 1 $ / hr and 5 . 61 E − 06 ≤ CEDC ≤ 229 . 1 $ / hr for same order. Additionally, the exergo-sustainability indicators: exergy waste ratio (EWR), environmental effect factor (EFF) and exergetic sustainability index (ESI) were estimated between 17 . 59 ≤ EEF ≤ 28 . 84   % ,   0 . 433 ≤ EWR ≤ 0 . 635   9 , 1.55 ≤ EFF ≤ 3.60 and 0.277 ≤ ESI ≤ 0.644. Conclusively, the intercooler and other modifications have a marginal effect but Cases 4 and 3 was most sustainable with considerable ESI.

      PubDate: 2017-03-07T15:13:05Z
      DOI: 10.1016/j.csite.2017.03.001
       
  • Mechanical drive gas turbine selection for service in two natural gas
           pipelines in Nigeria

    • Authors: Ogbonnaya Agwu; Chigozie Eleghasim
      Abstract: Publication date: Available online 28 February 2017
      Source:Case Studies in Thermal Engineering
      Author(s): Ogbonnaya Agwu, Chigozie Eleghasim
      The performance characteristics of land-based gas turbines are known to be greatly affected by ambient and operating conditions including inevitable machine deterioration. This study makes a selection of gas turbines for use as compressor station drivers on two natural gas pipelines in Nigeria taking into account the local site conditions of ambient temperature and altitude as well as some level of turbine deterioration. The analysis involved modelling and simulating the on-site performance of five gas turbine engines within the power requirement range of the compressor stations as dictated by pipeline gas flow studies. The overall effect of all considered factors was an engine thermal efficiency loss of 5.3% and a 26.3% decrement in power output. Selected turbines for driving the compressor stations must therefore have a minimum of 26.3% more power output than the value established by pipeline flow analyses. More generally, the results suggest that gas pipelines of 24-inch diameter with a throughput of 450 MMSCFD require a compression power of about 0.04MW/km if flow pressure is to be maintained at a minimum of 50bar. Also, a gas turbine driver should be capable of 0.05MW/km of pipeline given the local site conditions and engine deterioration.

      PubDate: 2017-03-01T15:08:39Z
      DOI: 10.1016/j.csite.2017.02.003
       
  • Numerical and experimental investigation of thermoelectric cooling in
           down-hole measuring tools; A Case study

    • Authors: Rohitha Weerasinghe; Thomas Hughes
      Abstract: Publication date: Available online 13 February 2017
      Source:Case Studies in Thermal Engineering
      Author(s): Rohitha Weerasinghe, Thomas Hughes
      Use of Peltier cooling in down-hole seismic tooling has been restricted by the performance of such devices at elevated temperatures. Present paper analyses the performance of Peltier cooling in temperatures suited for down-hole measuring equipment using measurements, predicted manufacturer data and computational fluid dynamic analysis. Peltier performance prediction techniques is presented with measurements. Validity of the extrapolation of thermoelectric cooling performance at elevated temperatures has been tested using computational models for thermoelectric cooling device. This method has been used to model cooling characteristics of a prototype downhole tool and the computational technique used has been proven valid.

      PubDate: 2017-02-15T14:34:23Z
      DOI: 10.1016/j.csite.2017.02.002
       
 
 
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