A steady state model of a supercritical organic Rankine cycle (SORC) was created in MATLAB and validated. Fluid properties were obtained using NIST REFPROP. Various working fluids were tested, including pentane (R601), isopentane (R601a), butane (R600), isobutane (R600a), butene, and cis-butene. Pentane and isopentane have not been of focus for SORCS at these temperatures. Varying turbine inlet temperatures ranging from 170 to 240°C were tested with the heat source provided by a medium temperature geothermal reservoir. A parametric analysis was performed on varying inlet pressure and turbine inlet temperature in comparison to first law efficiency, second law efficiency, effectiveness, and net work produced to analyze the overall and exergetic performance of each fluid. Optimum first law efficiency ranged from 17 to 22%. Cis-butene and pentane performed the best in all performance factors analyzed. Pentane and isopentane performed the best at pressures near or below their critical point. It was also found that near the critical temperature, a subcritical ORC has better performance than an SORC. This study is beneficial for not only geothermal energy but for applications that can provide operating temperatures between 170 to 240°C.
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ASME 2017 Power Conference Joint With ICOPE-17 collocated with the ASME 2017 11th International Conference on Energy Sustainability, the ASME 2017 15th International Conference on Fuel Cell Science, Engineering and Technology, and the ASME 2017 Nuclear Forum
June 26–30, 2017
Charlotte, North Carolina, USA
Conference Sponsors:
- Power Division
- Advanced Energy Systems Division
- Solar Energy Division
- Nuclear Engineering Division
ISBN:
978-0-7918-5761-8
PROCEEDINGS PAPER
Working Fluid Analysis for Supercritical Organic Rankine Cycles for Medium Geothermal Reservoir Temperatures Available to Purchase
Francesca Moloney,
Francesca Moloney
University of South Florida, Tampa, FL
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Eydhah Almatrafi,
Eydhah Almatrafi
University of South Florida, Tampa, FL
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D. Y. Goswami,
D. Y. Goswami
University of South Florida, Tampa, FL
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Elias Stefanakos
Elias Stefanakos
University of South Florida, Tampa, FL
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Francesca Moloney
University of South Florida, Tampa, FL
Eydhah Almatrafi
University of South Florida, Tampa, FL
D. Y. Goswami
University of South Florida, Tampa, FL
Elias Stefanakos
University of South Florida, Tampa, FL
Paper No:
POWER-ICOPE2017-3618, V002T09A018; 9 pages
Published Online:
September 5, 2017
Citation
Moloney, F, Almatrafi, E, Goswami, DY, & Stefanakos, E. "Working Fluid Analysis for Supercritical Organic Rankine Cycles for Medium Geothermal Reservoir Temperatures." Proceedings of the ASME 2017 Power Conference Joint With ICOPE-17 collocated with the ASME 2017 11th International Conference on Energy Sustainability, the ASME 2017 15th International Conference on Fuel Cell Science, Engineering and Technology, and the ASME 2017 Nuclear Forum. Charlotte, North Carolina, USA. June 26–30, 2017. V002T09A018. ASME. https://doi.org/10.1115/POWER-ICOPE2017-3618
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