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An integrated optimization for organic Rankine cycle based on entransy theory and thermodynamics

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  • Li, Tailu
  • Fu, Wencheng
  • Zhu, Jialing

Abstract

The organic Rankine cycle has been one of the essential heat-work conversion technologies nowadays. Lots of effectual optimization methods are focused on the promotion of the system efficiency, which are mainly relied on engineering experience and numerical simulations rather than theoretical analysis. A theoretical integrated optimization method was established based on the entransy theory and thermodynamics, with the ratio of the net power output to the ratio of the total thermal conductance to the thermal conductance in the condenser as the objective function. The system parameters besides the optimal pinch point temperature difference were obtained. The results show that the mass flow rate of the working fluid is inversely proportional to the evaporating temperature. An optimal evaporating temperature maximizes the net power output, and the maximal net power output corresponds to the maximal entransy loss and the change points of the heat source outlet temperature and the change rates for the entropy generation and the entransy dissipation. Moreover, the net power output and the total thermal conductance are inversely proportional to the pinch point temperature difference, contradicting with each other. Under the specified condition, the optimal operating parameters are ascertained, with the optimal pinch point temperature difference of 5 K.

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  • Li, Tailu & Fu, Wencheng & Zhu, Jialing, 2014. "An integrated optimization for organic Rankine cycle based on entransy theory and thermodynamics," Energy, Elsevier, vol. 72(C), pages 561-573.
    • Handle: RePEc:eee:energy:v:72:y:2014:i:c:p:561-573
    DOI: 10.1016/j.energy.2014.05.082
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    Cited by:

    1. Li, Tailu & Zhang, Zhigang & Lu, Jian & Yang, Junlan & Hu, Yujie, 2015. "Two-stage evaporation strategy to improve system performance for organic Rankine cycle," Applied Energy, Elsevier, vol. 150(C), pages 323-334.
    2. Xu, Sheng-Zhi & Guo, Zeng-Yuan, 2021. "Entransy transfer analysis methodology for energy conversion systems operating with thermodynamic cycles," Energy, Elsevier, vol. 224(C).
    3. Bademlioglu, A.H. & Canbolat, A.S. & Kaynakli, O., 2020. "Multi-objective optimization of parameters affecting Organic Rankine Cycle performance characteristics with Taguchi-Grey Relational Analysis," Renewable and Sustainable Energy Reviews, Elsevier, vol. 117(C).

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