Journal of Mechanical Science and Technology

, Volume 33, Issue 1, pp 447–458 | Cite as

Simultaneous optimization of multiparameters on a subcritical organic Rankine cycle system for low-grade waste heat recovery

  • Li Zhang
  • Chun-Chun Li
  • You-Rong LiEmail author
  • Chun-Mei Wu


This study aims to improve the thermo-economic performance of the subcritical organic Rankine cycle (ORC). Accordingly, an economical evaluation and the simultaneous multiparametric optimization on the subcritical ORC system for recovering low-grade waste heat of flue gas were conducted using electricity production cost (EPC) as the evaluation indicator. Results show that the optimum evaporating and condensing temperatures are mainly influenced by the inlet temperatures of flue gas and cooling fluid, respectively. High critical temperature of working fluids indicates high thermal-economic performance of the ORC system for 19 kinds of selected working fluids. Furthermore, the optimum pinch point temperature difference of evaporator decreases and that of condenser increases with the variation in the critical temperature of working fluids, but the optimum condensing temperature is unchanged. On the basis of a large number of calculation data, the correlations among the optimum cycle and external operating parameters of the subcritical ORC are proposed. These correlations can guide the engineering design of the subcritical ORC system.


Organic Rankine cycle Electricity production cost Parameter optimization Low-grade waste heat 


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Copyright information

© The Korean Society of Mechanical Engineers and Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  • Li Zhang
    • 1
    • 2
  • Chun-Chun Li
    • 1
  • You-Rong Li
    • 1
    Email author
  • Chun-Mei Wu
    • 1
  1. 1.Key Laboratory of Low-grade Energy Utilization Technologies and Systems of Ministry of Education, College of Power EngineeringChongqing UniversityChongqingChina
  2. 2.ChongQing City Management CollegeChongqingChina

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