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Optimal Heat Source Temperature for thermodynamic optimization of sub-critical Organic Rankine Cycles

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  • Liu, Wei
  • Meinel, Dominik
  • Gleinser, Moritz
  • Wieland, Christoph
  • Spliethoff, Hartmut

Abstract

Based on a sub-critical ORC (Organic Rankine Cycle) process, this study introduces the term OHST (Optimal Heat Source Temperature) with consideration of a suitable thermal match between heat source and working fluid. A theoretical formula is developed for predicting the OHST, which shows that OHST only depends on evaporation pressure and pinch point in the preheater and evaporator. A comparative study between the predicted OHSTs and those obtained from cycle simulations is performed, showing that the proposed formula is reliable, provided that HTF (Heat Transfer Fluid) is homogeneous and has good consistency in terms of heat capacity for different temperatures. To demonstrate the application of the proposed OHST-theory for thermodynamic optimization of ORC systems, a case study is presented based on a simple ORC coupled with thermal water at 140 °C. Consequently, using R227ea leads to the highest system efficiency of 10.38%, due to a better thermal match in the preheater and evaporator. In order to increase the exploitation of the thermal potential from the heat source, a dual-fluid-ORC is proposed, where R245fa and R227ea are considered for the high and low temperature ORC processes, respectively. Finally, this combination leads to the highest system efficiency of 11.07%.

Suggested Citation

  • Liu, Wei & Meinel, Dominik & Gleinser, Moritz & Wieland, Christoph & Spliethoff, Hartmut, 2015. "Optimal Heat Source Temperature for thermodynamic optimization of sub-critical Organic Rankine Cycles," Energy, Elsevier, vol. 88(C), pages 897-906.
    • Handle: RePEc:eee:energy:v:88:y:2015:i:c:p:897-906
    DOI: 10.1016/j.energy.2015.07.040
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    2. Sarkar, Jahar, 2018. "Generalized pinch point design method of subcritical-supercritical organic Rankine cycle for maximum heat recovery," Energy, Elsevier, vol. 143(C), pages 141-150.
    3. Jesper Graa Andreasen & Martin Ryhl Kærn & Fredrik Haglind, 2019. "Assessment of Methods for Performance Comparison of Pure and Zeotropic Working Fluids for Organic Rankine Cycle Power Systems," Energies, MDPI, vol. 12(9), pages 1-25, May.
    4. Manente, Giovanni & Da Lio, Luca & Lazzaretto, Andrea, 2016. "Influence of axial turbine efficiency maps on the performance of subcritical and supercritical Organic Rankine Cycle systems," Energy, Elsevier, vol. 107(C), pages 761-772.
    5. 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.
    6. Ge, Zhong & Wang, Hua & Wang, Hui-Tao & Wang, Jian-Jun & Li, Ming & Wu, Fu-Zhong & Zhang, Song-Yuan, 2015. "Main parameters optimization of regenerative organic Rankine cycle driven by low-temperature flue gas waste heat," Energy, Elsevier, vol. 93(P2), pages 1886-1895.
    7. Glover, Stephen & Douglas, Roy & De Rosa, Mattia & Zhang, Xiaolei & Glover, Laura, 2015. "Simulation of a multiple heat source supercritical ORC (Organic Rankine Cycle) for vehicle waste heat recovery," Energy, Elsevier, vol. 93(P2), pages 1568-1580.
    8. Martin T. White & Abdulnaser I. Sayma, 2018. "A Generalised Assessment of Working Fluids and Radial Turbines for Non-Recuperated Subcritical Organic Rankine Cycles," Energies, MDPI, vol. 11(4), pages 1-26, March.

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