This paper reports on the performance of various organic refrigerants and their mixtures as working fluids for power generation in a supercritical Rankine cycle (SRC) from geothermal sources. Organic fluids that have zero or very low ozone depletion potential and are environmentally safe are selected for this study. Geothermal source temperature is varied from 125–200°C, and the cooling water temperature is changed from 10–20°C. The effect of varying operating conditions on the performance of the thermodynamic cycle has been analyzed. Operating pressure of the cycle has been optimized for thermal efficiency for each fluid at each source temperature. The condensation pressure is determined by the cooling condition and is kept fixed for each condensation temperature. Energy and exergy efficiencies of the cycle have been obtained for the pure fluids as a function of heat source temperature. Mixtures of organic fluids have been analyzed and effect of composition on performance of the thermodynamic cycle has been studied. It is observed that thermal efficiency over 20% can be achieved for 200°C heat source temperature and the lowest cooling temperature. When mixtures are considered as working fluids, the thermal efficiency of the cycle is observed to remain between the thermal efficiencies of the constituent fluids.
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ASME 2012 6th International Conference on Energy Sustainability collocated with the ASME 2012 10th International Conference on Fuel Cell Science, Engineering and Technology
July 23–26, 2012
San Diego, California, USA
Conference Sponsors:
- Advanced Energy Systems Division
- Solar Energy Division
ISBN:
978-0-7918-4481-6
PROCEEDINGS PAPER
Performance of Working Fluids for Power Generation in a Supercritical Organic Rankine Cycle
Rachana Vidhi,
Rachana Vidhi
University of South Florida, Tampa, FL
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Sarada Kuravi,
Sarada Kuravi
University of South Florida, Tampa, FL
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Saeb Besarati,
Saeb Besarati
University of South Florida, Tampa, FL
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E. K. Stefanakos,
E. K. Stefanakos
University of South Florida, Tampa, FL
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D. Yogi Goswami,
D. Yogi Goswami
University of South Florida, Tampa, FL
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Adrian S. Sabau
Adrian S. Sabau
Oak Ridge National Laboratory, Oak Ridge, TN
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Rachana Vidhi
University of South Florida, Tampa, FL
Sarada Kuravi
University of South Florida, Tampa, FL
Saeb Besarati
University of South Florida, Tampa, FL
E. K. Stefanakos
University of South Florida, Tampa, FL
D. Yogi Goswami
University of South Florida, Tampa, FL
Adrian S. Sabau
Oak Ridge National Laboratory, Oak Ridge, TN
Paper No:
ES2012-91473, pp. 1273-1279; 7 pages
Published Online:
July 23, 2013
Citation
Vidhi, R, Kuravi, S, Besarati, S, Stefanakos, EK, Goswami, DY, & Sabau, AS. "Performance of Working Fluids for Power Generation in a Supercritical Organic Rankine Cycle." Proceedings of the ASME 2012 6th International Conference on Energy Sustainability collocated with the ASME 2012 10th International Conference on Fuel Cell Science, Engineering and Technology. ASME 2012 6th International Conference on Energy Sustainability, Parts A and B. San Diego, California, USA. July 23–26, 2012. pp. 1273-1279. ASME. https://doi.org/10.1115/ES2012-91473
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