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Heat‐Source and Evaporation Temperatures for the Organic Rankine Cycle
Author(s) -
Liu Bingcheng,
Liang Baohua,
Zhang Yunfei
Publication year - 2015
Publication title -
energy technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.91
H-Index - 44
eISSN - 2194-4296
pISSN - 2194-4288
DOI - 10.1002/ente.201500001
Subject(s) - evaporator , organic rankine cycle , working fluid , pinch point , degree rankine , evaporation , thermodynamics , mechanics , materials science , chemistry , power (physics) , physics , electricity generation , heat exchanger
This study establishes an analytical model to investigate the pinch‐point temperature difference (PPTD) between the heat source and the working fluid in the evaporator of the organic Rankine cycle (ORC) to determine the position of the PPTD and the mass flow rate of the working fluid. Based on the analytical model, a theoretical formula of net output power is proposed to analyze the effects of the evaporation temperature. The results show that the effects of the evaporation temperature depend on the position of the PPTD, which can be determined directly by using the heat‐source temperature, and the characteristic temperature is regarded as constant for each working fluid. The results of the net power output and the optimal evaporation temperature are calculated by using these theoretical formulas and the simulation method for 11 working fluids. A comparison of the results verifies the accuracy of the formulas.