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Analytical thermal efficiency of medium-low temperature organic Rankine cycles derived from entropy-generation analysis

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  • Li, Min
  • Zhao, Bingxiong

Abstract

Conventionally, we need complete and accurate property diagrams or equations of state of the working fluid to calculate the thermal efficiency of ORCs (organic Rankine cycles). In this paper, we develop by entropy-generation analysis several analytical expressions for the thermal efficiency of ORCs. These analytical formulas are functions of several dimensionless variables, enabling fast and accurate calculations without recourse to thermodynamic diagrams or equations of state. The entropy-generation analysis clarifies the thermodynamic mechanism behind the effect of superheat in the evaporator on the thermal efficiency. Among the derived dimensionless variables, cT3/r (T3 is the evaporating temperature, r is the heat of evaporation at the evaporating temperature, and c is the average heat capacity of the saturated liquid) reflects the influence of the critical temperature on the thermal efficiency and can serve as an indicator of evaluating working fluids in the same group: thermal efficiency generally decreases with cT3/r for the working fluids in the same category.

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  • Li, Min & Zhao, Bingxiong, 2016. "Analytical thermal efficiency of medium-low temperature organic Rankine cycles derived from entropy-generation analysis," Energy, Elsevier, vol. 106(C), pages 121-130.
    • Handle: RePEc:eee:energy:v:106:y:2016:i:c:p:121-130
    DOI: 10.1016/j.energy.2016.03.054
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    2. Wang, Yongzhen & Li, Chengjun & Zhao, Jun & Wu, Boyuan & Du, Yanping & Zhang, Jing & Zhu, Yilin, 2021. "The above-ground strategies to approach the goal of geothermal power generation in China: State of art and future researches," Renewable and Sustainable Energy Reviews, Elsevier, vol. 138(C).
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    4. 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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