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Power enhancement potential of a mixture transcritical cycle for a low-temperature geothermal power generation

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  • Baik, Young-Jin
  • Kim, Minsung
  • Chang, Ki-Chang
  • Lee, Young-Soo
  • Yoon, Hyung-Kee

Abstract

The power enhancement potential of a mixture transcritical cycle was investigated by comparison between the power of an R134a subcritical cycle and that of binary HFC (hydrofluorocarbon) mixture transcritical cycles for a low-temperature geothermal heat source of about 100°C. To fairly compare the power of the cycles by using different working fluids, each cycle was optimized from the view point of the power by three (or four for mixture cycles) design parameters. The first two are the turbine inlet temperature and pressure and the third is the ratio of the length of the vapor generator to the combined length of the vapor generator and the condenser. For the mixture cycles, the mixture composition was also optimized. In contrast to previous studies, to achieve a more realistic comparison, the characteristics of the working fluid's heat transfer and pressure drop were considered. Results show that the optimized R125-R245fa mixture transcritical cycle yields 11% more power than does the optimized R134a subcritical cycle under the simulation conditions considered in the present study.

Suggested Citation

  • Baik, Young-Jin & Kim, Minsung & Chang, Ki-Chang & Lee, Young-Soo & Yoon, Hyung-Kee, 2012. "Power enhancement potential of a mixture transcritical cycle for a low-temperature geothermal power generation," Energy, Elsevier, vol. 47(1), pages 70-76.
    • Handle: RePEc:eee:energy:v:47:y:2012:i:1:p:70-76
    DOI: 10.1016/j.energy.2012.06.041
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    References listed on IDEAS

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    Cited by:

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    12. Su, Wen & Hwang, Yunho & shao, Yawei & Deng, Shuai & Zhao, Li & Nie, Xianhua & Zhang, Yue, 2019. "Error analysis of ORC performance calculation based on the Helmholtz equation with different binary interaction parameters of mixture," Energy, Elsevier, vol. 166(C), pages 414-425.
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    14. Liu, Qiang & Shen, Aijing & Duan, Yuanyuan, 2015. "Parametric optimization and performance analyses of geothermal organic Rankine cycles using R600a/R601a mixtures as working fluids," Applied Energy, Elsevier, vol. 148(C), pages 410-420.
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    16. Le, Van Long & Feidt, Michel & Kheiri, Abdelhamid & Pelloux-Prayer, Sandrine, 2014. "Performance optimization of low-temperature power generation by supercritical ORCs (organic Rankine cycles) using low GWP (global warming potential) working fluids," Energy, Elsevier, vol. 67(C), pages 513-526.
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    18. Xu, Weicong & Zhao, Ruikai & Deng, Shuai & Zhao, Li & Mao, Samuel S., 2021. "Is zeotropic working fluid a promising option for organic Rankine cycle: A quantitative evaluation based on literature data," Renewable and Sustainable Energy Reviews, Elsevier, vol. 148(C).
    19. Costante Invernizzi & Marco Binotti & Paola Bombarda & Gioele Di Marcoberardino & Paolo Iora & Giampaolo Manzolini, 2019. "Water Mixtures as Working Fluids in Organic Rankine Cycles," Energies, MDPI, vol. 12(13), pages 1-17, July.
    20. Zheng, Nan & Song, Weidong & Zhao, Li, 2013. "Theoretical and experimental investigations on the changing regularity of the extreme point of the temperature difference between zeotropic mixtures and heat transfer fluid," Energy, Elsevier, vol. 55(C), pages 541-552.
    21. Florian Heberle & Dieter Brüggemann, 2015. "Thermo-Economic Evaluation of Organic Rankine Cycles for Geothermal Power Generation Using Zeotropic Mixtures," Energies, MDPI, vol. 8(3), pages 1-28, March.

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