Hybrid journal (It can contain Open Access articles) ISSN (Print) 1742-8297 - ISSN (Online) 1742-8300 Published by Inderscience Publishers[439 journals]
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Authors:Huseyin Utku Helvaci, Nazlı Keles, Gulden Gokcen Akkurt Pages: 1 - 19 Abstract: A geothermal energy-sourced drying system was tested for the thin-layer drying process of tomato slices at air temperatures of 40°C, 50°C and 60°C and velocities of 0.5 m/s and 1.5 m/s to investigate system performance in terms of the first and second laws of thermodynamics. The energy and the exergy efficiency of the system were found to be 6.6% and 22.31%. The energy utilisation and energy utilisation ratio were calculated in the range of 1.271 kW-5.102 kW and 9.644%-39.56%, respectively. The exergy destruction, exergy efficiency and improvement potential of the drying chamber varied between 0.0198 kW-0.2621 kW, 59.74%-81.95% and 0.00486 kW-0.07396 kW, respectively. Keywords: geothermal energy; tomato drying; sustainable drying; energy analysis; exergy analysis Citation: International Journal of Exergy, Vol. 41, No. 1 (2023) pp. 1 - 19 PubDate: 2023-05-14T23:20:50-05:00 DOI: 10.1504/IJEX.2023.130938 Issue No:Vol. 41, No. 1 (2023)
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Authors:Joseph Oyekale, Abiola J. Adeyi Pages: 20 - 40 Abstract: This study was aimed at assessing the exergetic and exergoeconomic implications of adopting a recuperative (SUB-REGEN) instead of a non-recuperative (SUB) organic Rankine cycle (ORC) plant for power production from an abandoned oil well. The geometric parameters of a typical oil well in Nigeria were adopted for simulating the heat source. The specific exergy costing (SPECO) approach was employed for the exergoeconomic assessment. Results showed that for the SUB ORC, the evaporator had the highest exergetic efficiency of about 86% and the condenser the highest cost rate of exergy destruction of about 47%. For the SUB-REGEN ORC, the condenser had the highest contribution ratio of 0.41 to the total irreversibility with a cost rate of about 19.1 k$/h. Overall, the integration of a recuperator would increase the ORC exergetic efficiency from around 55% to 58%, albeit with a consequent increase in the cost rate of system irreversibility by about 24%. Keywords: abandoned oil well retrofit; organic Rankine cycle; ORC; energy efficiency; sustainable energy system; exergy and exergoeconomic analyses Citation: International Journal of Exergy, Vol. 41, No. 1 (2023) pp. 20 - 40 PubDate: 2023-05-14T23:20:50-05:00 DOI: 10.1504/IJEX.2023.130939 Issue No:Vol. 41, No. 1 (2023)
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Authors:Florence G. Kiburi, Erick K. Ronoh, Christopher L. Kanali, Gareth M. Kituu, Patrick O. Ajwang Pages: 41 - 59 Abstract: In this study, an elitist non-dominated sorting genetic algorithm was applied in exergetic optimisation of a solar-biomass hybrid greenhouse dryer in drying banana slices. To develop comprehensive relationships for objective functions under each drying mode (solar, biomass, and solar-biomass), the system was linearised around drying and exit air temperatures. The objective functions involved maximising exergy efficiency and drying air temperature of the system. The trade-offs showed that solar and solar-biomass modes required the same airflow rate (0.05 kg/s) indicating that at these combinations the dryer received almost equal energy input. Biomass mode trade-offs indicated that a lower flow rate (0.01 kg/s) was required for drying. Further, both solar-biomass and biomass modes must maintain a fuel feed rate of 0.001 kg/s for maximum exergy efficiency (solar-biomass: 80.21% ± 14.26%; biomass: 79.28% ± 10.38%) and drying air temperature of 333 K. Performance evaluation of the optimised system demonstrated its superiority compared to the unoptimised system. Keywords: exergy; hybrid greenhouse dryer; solar-biomass; energy mode; optimisation; genetic algorithm; efficiency; drying temperature; performance evaluation; banana slices Citation: International Journal of Exergy, Vol. 41, No. 1 (2023) pp. 41 - 59 PubDate: 2023-05-14T23:20:50-05:00 DOI: 10.1504/IJEX.2023.130940 Issue No:Vol. 41, No. 1 (2023)
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Authors:Zeynep Naz Ayvalı, Onder Ozgener, Leyla Ozgener Pages: 60 - 73 Abstract: This study examines a drying process for paint-drying ovens with actual operating data. This process is one of the most energy consuming processes in the manufacturing process of a company that produces propeller shafts in Manisa. This paper aims to determine the energy and exergy belts on a sectoral basis in light of the examined company and make an efficiency analysis. As a result of the analysis, the exergoeconomic values are calculated as the energy loss/cost ratio in current fresh air temperature is <i>R<SUB align="right">en</i>: 7.368 W/$, exergy losses/cost <i>R<SUB align="right">ex</i>: 0.318 W/$, and the total energy need is reduced by 13.25%. Keywords: energy analysis; exergy analysis; exergoeconomic; paint curing Citation: International Journal of Exergy, Vol. 41, No. 1 (2023) pp. 60 - 73 PubDate: 2023-05-14T23:20:50-05:00 DOI: 10.1504/IJEX.2023.130942 Issue No:Vol. 41, No. 1 (2023)
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Authors:Sudhansu S. Mishra, Taraprasad Mohapatra Pages: 74 - 90 Abstract: A variable ratio compression ignition engine is tested experimentally for different fuel type (diesel, e-diesel and nano fuel), load (4 kg, 8 kg and 12 kg), and compression ratios (14, 16, and 18) to determine its performance (energy and exergy efficiency), emission (NOx emission), and economic characteristics (% relative cost). Multiple response optimisation is carried out using response surface methodology for maximum performance, minimum emissions and cost. 5.2 kg load, 18 CR, and nano fuel are determined as the optimal input parameters for attaining maximum energy and exergy efficiency of 24.8% and 62.9%, minimum NOx emission and % cost variation of 208.4 ppm, and -6.5 respectively. Keywords: Al2O3 nanoparticles; energy; exergy; economic analysis; multi-response optimisation; response surface methodology; RSM Citation: International Journal of Exergy, Vol. 41, No. 1 (2023) pp. 74 - 90 PubDate: 2023-05-14T23:20:50-05:00 DOI: 10.1504/IJEX.2023.130943 Issue No:Vol. 41, No. 1 (2023)
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Authors:Rajesh Kumar, Sujit Karmakar Pages: 91 - 109 Abstract: Solar energy is the most readily available energy in India, which can be utilised in coal-fired thermal power plants for feedwater heating and Monoethanolamine (MEA) for MEA regeneration in post-combustion CO<SUB align="right">2 capture unit. The present study deals with 4-E (energy, exergy, environment, and economic) analysis of a 500 MWe Supercritical (SupC) coal-based thermal power plant with solar-assisted feedwater heating and MEA regeneration in CO<SUB align="right">2 capture unit. Results show that the plant efficiency is improved by 8.2% points, and the coal consumption rate is reduced by 18%. The levelised cost of electricity (LCoE) generation is increased to INR 6, and the cost for CO<SUB align="right">2 avoided is INR 3607 per tonne of CO<SUB align="right">2. Keywords: solar energy; exergy; supercritical; high ash coal; CO2 emissions; Monoethanolamine; MEA; levelised cost of electricity; LCoE Citation: International Journal of Exergy, Vol. 41, No. 1 (2023) pp. 91 - 109 PubDate: 2023-05-14T23:20:50-05:00 DOI: 10.1504/IJEX.2023.130944 Issue No:Vol. 41, No. 1 (2023)
Hybrid journal (It can contain Open Access articles)
[439 journals]
