A Method for Determining the Operable Ideal Condensation Temperature of Dry and Isentropic Fluids Used in Organic Rankine Cycle (ORC) Based on Temperature-Entropy (T-s) Diagram

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  • 1. MOE key laboratory of enhanced heat transfer and energy conservation, Beijing University of Technology, Beijing 100124, China
    2. Beijing key laboratory of heat transfer and energy conversion, Beijing University of Technology, Beijing 100124, China

Online published: 2023-11-26

Supported by

The supports provided by the National Natural Science Foundation of China (Grant No. 51506001) for the completion of the present work are gratefully acknowledged.

Copyright

Science Press, Institute of Engineering Thermophysics, CAS and Springer-Verlag GmbH Germany, part of Springer Nature 2023

Abstract

Condensation temperature is one of the crucial parameters determining the performance of an organic Rankine cycle. It is necessary to consider the differences in the working fluids themselves when setting the condensation temperature of organic Rankine cycle. In current study, temperature-entropy (T-s) diagram is employed to describe the difference in working fluids. Three areas of dry and isentropic fluids in a temperature-entropy (T-s) diagram, which are the area denoting net output work of cycle (A1), the area denoting net output work of the Carnot cycle (A), and the curved triangle in superheated region denoting condensation characteristics (A2), are defined. On this basis, the ratio of A2 to A1 and the ratio of A1 to A are calculated. Logarithmic Mean Difference of the above two ratios is obtained to determine the operable ideal condensation temperature of 66 dry and isentropic fluids employed in Organic Rankine Cycle. The findings indicate that the operable ideal condensation temperatures for the majority of dry and isentropic fluids are in the range of 305 K to 310 K. The work presented in this study may be useful for designing and establishing an Organic Rankine Cycle system.

Cite this article

ZHANG Xinxin, LI Yang . A Method for Determining the Operable Ideal Condensation Temperature of Dry and Isentropic Fluids Used in Organic Rankine Cycle (ORC) Based on Temperature-Entropy (T-s) Diagram[J]. Journal of Thermal Science, 2023 , 32(6) : 2144 -2154 . DOI: 10.1007/s11630-023-1905-9

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