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Publisher: Diponegoro University   (Total: 21 journals)   [Sort by number of followers]

Showing 1 - 21 of 21 Journals sorted alphabetically
Bulletin of Chemical Reaction Engineering & Catalysis     Open Access   (Followers: 2, SJR: 0.192, h-index: 6)
Geoplanning : J. of Geomatics and Planning     Open Access   (Followers: 1)
ILMU KELAUTAN : Indonesian J. of Marine Sciences     Open Access   (Followers: 1)
Intl. J. of Renewable Energy Development     Open Access   (Followers: 5)
Intl. J. of Waste Resources     Open Access   (Followers: 4)
Izumi : Jurnal Bahasa, Sastra dan Budaya Jepang     Open Access  
J. of Biomedicine and Translational Research     Open Access  
J. of Coastal Development     Open Access   (Followers: 2)
J. of the Indonesian Tropical Animal Agriculture     Open Access  
Jurnal Anestesiologi Indonesia     Open Access  
Jurnal Ilmu Lingkungan     Open Access   (Followers: 1)
Jurnal Reaktor     Open Access  
Jurnal Sistem Komputer     Open Access   (Followers: 1)
Jurnal Teknologi dan Sistem Komputer     Open Access  
Jurnal Wilayah dan Lingkungan     Open Access   (Followers: 1)
Kapal     Open Access   (Followers: 1)
Nurse Media : J. of Nursing     Open Access  
Parole : J. of Linguistics and Education     Open Access  
Tataloka     Open Access  
Teknik     Open Access  
Waste Technology     Open Access   (Followers: 3)
Journal Cover International Journal of Renewable Energy Development
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  This is an Open Access Journal Open Access journal
   ISSN (Print) 2252-4940 - ISSN (Online) 2252-4940
   Published by Diponegoro University Homepage  [21 journals]
  • Modeling and Analysis of Solar Photovoltaic Assisted Electrolyzer-Polymer
           Electrolyte Membrane Fuel Cell For Running a Hospital in Remote Area in
           Kolkata, India

    • Authors: Kamaljyoti Talukdar
      Pages: 181 - 191
      Abstract: The present work consists of the modeling and analysis of solar photovoltaic panels integrated with electrolyzer bank and Polymer Electrolyte Membrane (PEM) fuel cell stacks for running different appliances of a hospital located in Kolkata for different climatic conditions. Electric power is generated by an array of solar photovoltaic modules. Excess energy after meeting the requirements of the hospital during peak sunshine hours is supplied to an electrolyzer bank to generate hydrogen gas, which is consumed by the PEM fuel cell stack to support the power requirement during the energy deficit hours. The study reveals that 875 solar photovoltaic modules in parallel each having 2 modules in series of Central Electronics Limited Make PM 150 with a 178.537 kW electrolyzer and 27 PEM fuel cell stacks, each of 382.372 W, can support the energy requirement of a 200 lights (100 W each), 4 pumps (2 kW each), 120 fans(65 W each) and 5 refrigerators (2 kW each)system operated for 16 hours, 2 hours,15 hours and 24 hours respectively. 123 solar photovoltaic modules in parallel each having 2 modules in series of Central Electronics Limited Make PM 150 is needed to run the gas compressor for storing hydrogen in the cylinder during sunshine hours.  Keywords: Central Electronics Limited, Electrolyzer, PEM, PM 150, Solar photovoltaic. Article History: Received Feb 5th 2017; Received in revised form June 2nd 2017; Accepted June 28th 2017; Available onlineHow to Cite This Article: Talukdar, K. (2017). Modeling and Analysis of Solar Photovoltaic Assisted Electrolyzer-Polymer Electrolyte Membrane Fuel Cell For Running a Hospital in Remote Area in Kolkata,India. International Journal of Renewable Energy Development, 6(2), 181-191.
      PubDate: 2017-06-28
      DOI: 10.14710/ijred.6.2.181-191
      Issue No: Vol. 6, No. 2 (2017)
  • Study of fabricated solar dryer of tomato slices under Jordan climate

    • Authors: Abdullah Nasrallh Olimat
      First page: 93
      Abstract: The objective of the current study was to investigate experimentally, the performance of a fabricated solar flat plate collector under Jordan climate condition during the summer of 2013. The temporal variations of temperature difference between absorber plate and ambient temperature were obtained in the results and its influence on the performance of collector was examined. The effect of absorber plate temperature, ambient temperature and wind heat transfer coefficient on the top heat loss coefficient was also investigated. The results showed that the efficiency of the collector ranging between 60 to 70 % which affected significantly by the amount of solar irradiation during the day. The top heat loss was taken into considerations, since other losses were very small and might be negligible. Also the results confirmed that the performance of the dryer was maximum when the difference between plate and ambient temperatures was maximum. In addition, this work presented an indirect forced convection solar dryer, which consists of solar heater, fan and drying chamber. Fan was used to force the heated air through chamber to increase the drying rate. Tomatoes were dried to the final moisture content 28% from 95% (w.b). The experimental moisture ratios of the tomatoes were fitted to four mathematical drying models. Comparisons between these modes are sought using statistical analysis in the results. The fit quality obtained with each model was evaluated. After the comparison with the experimental obtained values, it was concluded that polynomial equation with second order represents the drying characteristics bitter than the other models by indicating high value of coefficient correlation (R2= 0.999564 ) and low values of other parameters( 𝞌2= 0.000203; RMSE= 0.01011; MBE= 0.000102 ) compare with other models. The effective moisture diffusivity was estimated using Fick's second law and was   m2/s with an average temperature of 306 K.
      PubDate: 2017-06-07
      DOI: 10.14710/ijred.1.1.%p
      Issue No: Vol. 1, No. 1 (2017)
  • Wind Energy Potential at Badin and Pasni Costal Line of Pakistan

    • Authors: Ghulam sarwar Kaloi, Jie Wang, Mazhar H Baloch, Sohaib Tahir, Sohaib Tahir
      First page: 103
      Abstract: Unfortunately, Pakistan is facing a severe energy crisis of the past decade due to the increasing population and is heavily dependent on imports of fossil fuels. The shortage of the electricity was 14-18 hours in rural areas and 8-10 hours in urban areas. This situation has been significantly affected the residential, industrial and commercial sector in the country. At this time, it is immense challenge for the government to keep the power supply in the future of the country. In this situation, it has been increased research to explore renewable energy sources in the country to fulfil the deficit scenario in the state. Renewable energy technology sector has not penetrated in the energy mix is currently in the upcoming markets. This paper highlight the steps took the country in the past and that steps were taking place at the present time to emerge from the existing energy crisis when most urban areas suffering from power outages for 12 hours a day. Until 2009, no single grid interconnected wind farm, but now the circumstances have changed significantly and wind farms contribute to the national grid is the reality now. The opening of the three farms interconnected network and many others in the pipeline. The federal policy on wind energy systems has recently changed after surprisingly slow down for continuing schemes. This paper reviews developments in the wind energy sector in the country and lists some suggestions that can contribute to improving the penetration of wind energy in the national energy mix.
      PubDate: 2017-06-07
      DOI: 10.14710/ijred.1.1.%p
      Issue No: Vol. 1, No. 1 (2017)
  • Developing A Family-Size Biogas-Fueled Electricity Generating System

    • Authors: Agus Haryanto, Fadli Marotin, Sugeng Triyono, Udin Hasanudin
      First page: 111
      Abstract: The purpose of this study is to develop a family-size biogas-fueled electricity generating system consisting of anaerobic digester, bio-filter scrubber, and power generating engine. Biogas was produced from a pilot scale wet anaerobic digester (5-m3 capacity). The biogas was filtered using bio-scrubber column filled with locally made compost to reduce hydrogen sulfide (H2S) content. Biogas composition was analysed using a gas chromatograph and its H2S level was measured using a H2S detector. A 750-W four stroke power generating engine was used with 100% biogas. Biogas consumed by the generator engine was measured at different load from 100 to 700 W (13.3 to 93.3% of the rated power). Three replications for each load experiment were taken. Results showed that the total biogas yield was 1.91 m3/day with methane content of 56.48% by volume. Bio-filter successfully reduced H2S content in the biogas by 98% (from 400 ppm to 9 ppm). Generator engine showed good performance during the test with average biogas consumption of 415.3 L/h. Specific biogas consumption decreased from 5.05 L/Wh to 1.15 L/Wh at loads of 100 W to 700 W, respectively. Thermal efficiency increased with loads from 6.4% at 100 W to 28.1 at 700 W. The highest thermal efficiency of 30% was achieved at a load of 600 W (80% of the rated power) with specific biogas consumption of 1.07 L/Wh.
      PubDate: 2017-06-07
      DOI: 10.14710/ijred.1.1.%p
      Issue No: Vol. 1, No. 1 (2017)
  • Experiment and simulation effect of cyclic pitch control on performance of
           horizontal axis wind turbine

    • Authors: Le Quang SANG, Takao MAEDA, Yasunari KAMADA, Qing'an Li
      First page: 119
      Abstract: Offshore wind is generally stronger and more consistent than wind on land. A large part of the offshore wind resource is however located in deep water, where floating wind turbines can harvest more energy. This paper describes a systematic experiment and a simulation analysis (FAST code) about the cyclic pitch control of blades. This work was performed to investigate performance fluctuation of a floating wind turbine utilizing cyclic pitch control. The experiment was carried out in an open wind tunnel with mainstream wind velocity of 10 m/s with the front inflow wind and the oblique inflow wind conditions. A model wind turbine is two-bladed downwind wind turbine with diameter of 1.6 m. Moment and force acts on the model wind turbine are measured by a six-component balance. Fluctuation of power coefficient and thrust coefficient is investigated in the cyclic pitch control. The model wind turbine and the experimental conditions were simulated by FAST code. The comparison of the experimental data and the simulation results of FAST code show that the power coefficient and thrust coefficient are in good agreement.
      PubDate: 2017-06-07
      DOI: 10.14710/ijred.1.1.%p
      Issue No: Vol. 1, No. 1 (2017)
  • Comparison between conventional design and cathode gas recirculation
           design of a direct-syngas solid oxide fuel cell–gas turbine hybrid
           systems part I: Design performance

    • Authors: Vahid Azami, Mortaza Yari
      First page: 127
      Abstract: In this paper, a conventional SOFC–GT hybrid system and an SOFC–GT hybrid system with cathode gas recirculation system fuelled with syngas as the main source of energy were analyzed and their performances were compared. In the conventional SOFC–GT hybrid system the incoming air to the cathode is heated at the air recuperator and air preheater to meet the required cathode inlet temperature while in the SOFC–GT hybrid system with cathode gas recirculation, in addition to the air recuperator and air preheater, also the recirculation of the cathode exhaust gas is used to meet the required cathode inlet temperature. The system performances have been analyzed by means of models developed with the computer program Cycle–Tempo. A complete model of the SOFC–GT hybrid system with these two configurations evaluated in terms of energy and exergy efficiencies and their performance characteristics were compared. Simulation results show that the electrical energy and exergy efficiencies achieved in the cathode gas recirculation plant (64.76% and 66.28%, respectively) are significantly higher than those obtained in the conventional plant (54.53% and 55.8%).
      PubDate: 2017-06-07
      DOI: 10.14710/ijred.1.1.%p
      Issue No: Vol. 1, No. 1 (2017)
  • Performance Study of a Floricultural Greenhouse Surrounded by Shallow
           Water Ponds

    • Authors: Debajit Misra, Sudip Ghosh
      First page: 137
      Abstract: In the present paper, an innovative low energy-intensive evaporative cooling system has been proposed for greenhouse application in near-tropical regions dominated by hot climate. The system can operate under dual- ventilation mode to maintain a favourable microclimate inside the greenhouse. A single ridge type un-even span greenhouse has been considered, targeting a few species of Indian tropical flowers. The greenhouse has a continuous roof vent as well as adjustable side vents and is equipped with exhaust fans on top and roll-up curtains on the sides. The greenhouse is surrounded by shallow water ponds outside its longitudinal walls and evaporative surfaces partially cover the free water surface. Inside the pond, low cost evaporative surfaces are so placed that they form air channels.  Thus, outside air flows through the channels formed by the wetted surfaces over the water surface and undergoes evaporative cooling before entering the greenhouse. A simplified theoretical model has been presented in this paper to predict the inside greenhouse air temperature while ambient weather data are used as model inputs. The study reveals that during average radiation periods, the greenhouse can depends solely on natural ventilation and during peak radiation hours fan-induced ventilation is needed to maintain required level of temperature. It is seen that under dual-ventilation mode greenhouse temperature can be kept 3-6 oC lower than ambient temperature when saturation effectiveness is 0.7 and with 75% shading.
      PubDate: 2017-06-07
      DOI: 10.14710/ijred.1.1.%p
      Issue No: Vol. 1, No. 1 (2017)
  • Modeling and Experimental Validation of a Transient Direct Expansion Heat

    • Authors: Clément Rousseau
      First page: 145
      Abstract: Geothermal heat pump technology is currently one of the most interesting technologies used to heat buildings. There are two designs used in the industry: geothermal heat pump using a secondary ground loop and Direct Expansion (DX) ground source heat pump. The latter is less used, possibly because less research has been carried out for the design of this kind of heat pump. In this paper, a transient model using the Comsol Multiphysic of a DX ground heat pump is presented in heating mode with R22, and a comparison with experimental results is presented with a 24-hour test. It is shown that the model is adequately validated by our experiment. Following this validation, a parametric analysis is realised
      PubDate: 2017-06-07
      DOI: 10.14710/ijred.1.1.%p
      Issue No: Vol. 1, No. 1 (2017)
  • Influence the Rubber Seed Type and Altitude on Characteristic of Seed, Oil
           and Biodiesel

    • Authors: Poedji Loekitowati Hariani, Salni Salni Salni, Hanifa Marisa Hanifa
      First page: 157
      Abstract: Types of rubber seed and altitude affect the characteristics of the seed, oil and methyl ester (biodiesel). This research studies the influence of the type of rubber seed that is superior and local, altitude plant in southern Sumatra province. Rubber plants planted from local rubber seed by seeds seedlings and superior rubber seed by selected clones. In the study, rubber plants planted at a different altitude, namely in Banyuasin district (18 above sea level), Prabumulih District (176 above sea level) and Lahat District (627 above sea level). The results showed that the weight of the flour, the water content and ash content in the local rubber seeds larger than the superior rubber seed for all altitude, but oil content a large in the superior rubber seeds. The major of fatty acids in the rubber seed oil in all types and altitude are a linoleic acid with a different percentage except local rubber seed oil from Lahat district with the large percentage of octadecanoic acid. Free fatty acids in the oil from the superior seeds rubber of 13.897-15.494 % large than local rubber seed oil was found 9.786-10.399 % for all altitude. By esterification process using sulfuric acid catalyst, Free Fatty Acid (FFA) can be reduced to ≤ 2 %. The methyl ester from the transesterification process of rubber seed oil after esterification using methanol and sodium hydroxide as catalyst indicated that the quality of methyl ester from superior rubber seed oil in the Banyuasin and Prabumulih district better than another methyl ester. Analysis of methyl esters includes cetane index, flash point, kinematic viscosity, carbon residue, density, moisture content, water and sediment content and distillation compared with SNI 7182 and ASTM 6751-02.
      PubDate: 2017-06-10
      DOI: 10.14710/ijred.1.1.%p
      Issue No: Vol. 1, No. 1 (2017)
  • Enhancement of Hybrid SPEEK Based Polymer–Cyclodextrin-Silica Inorganic
           Membrane for Direct Methanol Fuel Cell Application

    • Authors: Tutuk Djoko Kusworo, Muhammad Fahmi Hakim
      First page: 165
      Abstract: Direct methanol fuel cell (DMFC) is one of several types of fuel cells that use proton exchange membrane  (PEM) as a liaison between the reaction at the cathode and anode. Polyether-ether ketone (PEEK) is one of the aromatic polymer that can be applied in DMFC because apart from its characteristics that are resistant to environmental DMFC (methanol), the polymer is also quite easy in his sulfonation process that is concentrated sulfuric acid. However the role of polyether-ether ketone as the DMFC membrane material still has the disadvantage that is still relatively low conductivity values that need to be modified additive on the membrane material to increase the value of proton conductivity of the membrane. The purpose of this experiment is to modify the membrane (sPEEK) with the addition of cyclodextrins-silica, additive variation charge of 2%, 6% and 10% on time and temperature were fixed at 4 hours and 650C. The results showed the best results are in the membrane sPEEK -cyclodextrin -silica 10% with the characteristic membrane that is the value of ion exchange capacity of 2.19 meq / g polymer, the degree of sulfonation of 81%, methanol permeability of 3.09 x 10-9 cm2 / s and water uptake membrane of 64%.
      PubDate: 2017-06-07
      DOI: 10.14710/ijred.1.1.%p
      Issue No: Vol. 1, No. 1 (2017)
  • Statistical Process Optimization of Lipid Extraction from municipal Scum
           Sludge for Biodiesel Production

    • Authors: samir Hag Ibrahim, Emad Hamza
      First page: 171
      Abstract: Design of Experiment (DoE) as a statistical method was applied for optimizing lipid extraction conditions from scum sludge. Four different extraction variables were optimized namely methanol to hexane ratio (%), solvent to sludge ratio (ml/g), temperature (oC), and extraction time (h). Process optimization was conducted through three main steps: 1) 2k factorial screening design; 2) steepest ascent method, and 3) Box-Behnken design and response surface method. Based on 2k factorial screening design, methanol to hexane ratio, solvent to sludge ratio and temperature were identified as highly significant variables affecting lipid extraction from scum sludge. Based on screening results, the steepest ascent method was used followed by Box-Behnken design and Response Surface Method (RSM) were then applied for optimization. The maximum extracted lipid of 29.4% (wt lipid/wt dry sludge %) was achieved at 40% methanol to hexane ratio (%), 40 solvent to sludge ratio (ml/g), 90 oC and 6 hours extraction time. The results revealed that lipid extraction increases with reducing the methanol to hexane ratio, increasing solvent to sludge ratio and increasing temperature The results demonstrated the potentiality of scum sludge for biodiesel production from scum sludge compared with the amount of lipid extracted from primary and secondary sludge reported by other studies.
      PubDate: 2017-06-07
      DOI: 10.14710/ijred.1.1.%p
      Issue No: Vol. 1, No. 1 (2017)
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