Exergetic analysis of regenerative rankine cycle with partial evaporation using zeotropic mixture as working fluid

Author(s):Kyoung Hoon Kim
Department of Mechanical Engineering, Kumoh National Institute of Technokogy
Daehakro 61, Gumi, Gyeongbuk 39177, Korea
International Journal of Smart Grid and Clean Energy, vol. 7, no. 1, January 2018: pp. 24-31
ISSN: 2315-4462 (Print)
ISSN: 2373-3594 (Online)
Digital Object Identifier: 10.12720/sgce.7.1.24-31

Abstract: The power generation cycle using zeotropic mixture as working fluid has several advantages for recovery of low-grade finite heat sources. In this paper an exergetic analysis is carried out for regenerative partial-evaporation Rankine cycle with ammonia-water mixture. Based on the first and second laws of thermodynamics, the effects of the important system parameters on the exergetical performance of the system were theoretically investigated. The results showed that the second law efficiency has an optimum value with respect to the fluid quality at expander inlet as well as the ammonia mass fraction.

Keywords:ammonia-water mixture, Rankine cycle, partial evaporation, exergy, second- law efficiency
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