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Experimental study of a 1 kw organic Rankine cycle with a zeotropic mixture of R245fa/R134a

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  • Bamorovat Abadi, Gholamreza
  • Yun, Eunkoo
  • Kim, Kyung Chun

Abstract

The performance of a new zeotropic mixture of R245fa 60%/R134a 40% (molar concentration) in small scale ORC (organic Rankine cycle) was proposed and evaluated experimentally. For a range of heat source temperatures, the power output and thermal efficiency of the ORC system with this mixture was analyzed. The experimental data is presented for a 1 kW scroll expander and a heat source temperature between 80 and 120 °C. The results showed that the proposed zeotropic mixture increases the power output compared to an identical ORC with pure R245fa despite working at a lower pressure ratio. With increasing heat source temperature, the pure R245fa ORC becomes increasingly vigorous. Therefore, the best application of this mixture would be in heat sources with temperatures between 80 °C and 100 °C, where the pure R245fa ORC cannot have a high expander inlet pressure; hence, it works at lower pressure ratios.

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  • Bamorovat Abadi, Gholamreza & Yun, Eunkoo & Kim, Kyung Chun, 2015. "Experimental study of a 1 kw organic Rankine cycle with a zeotropic mixture of R245fa/R134a," Energy, Elsevier, vol. 93(P2), pages 2363-2373.
    • Handle: RePEc:eee:energy:v:93:y:2015:i:p2:p:2363-2373
    DOI: 10.1016/j.energy.2015.10.092
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    18. Wang, Z.X. & Li, H.Y. & Zhang, X.F. & Wang, L.W. & Du, S. & Fang, C., 2020. "Performance analysis on a novel micro-scale combined cooling, heating and power (CCHP) system for domestic utilization driven by biomass energy," Renewable Energy, Elsevier, vol. 156(C), pages 1215-1232.
    19. Sun, Xiaocun & Shi, Lingfeng & Tian, Hua & Wang, Xuan & Zhang, Yonghao & Yao, Yu & Sun, Rui & Shu, Gequn, 2022. "Analysis of an ideal composition tunable combined cooling and power cycle with CO2-based mixture," Energy, Elsevier, vol. 255(C).
    20. 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).
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