Entropy and Exergy Analysis of a Heat Recovery Vapor Generator for Ammonia-Water Mixtures

Entropy

Kyoung Hoon Kim¹  Kyoungjin Kim² 

[1] Department of Mechanical Engineering, Kumoh National Institute of Technology, 61 Daehak-ro, Gumi, Gyeongbuk 730-701, Korea; E-Mail:;Department of Mechanical System Engineering, Kumoh National Institute of Technology, 61 Daehak-ro, Gumi, Gyeongbuk 730-701, Korea; E-Mail:

关键词: entropy;    exergy;    ammonia-water mixture;    heat recovery vapor generator;   

DOI  :  10.3390/e16042056

来源: mdpi

【 摘 要 】

Recently power generation systems using ammonia-water binary mixtures as a working fluid have been attracting much attention for their efficient conversion of low-grade heat sources into useful energy forms. This paper presents the First and Second Law thermodynamic analysis for a heat recovery vapor generator (HRVG) of ammonia-water mixtures when the heat source is low-temperature energy in the form of sensible heat. In the analysis, key parameters such as ammonia mass concentration and pressure of the binary mixture are studied to investigate their effects on the system performance, including the effectiveness of heat transfer, entropy generation, and exergy efficiency. The results show that the ammonia concentration and the pressure of the mixture have significant effects on the system performance of the HRVG.

【 授权许可】

CC BY   
© 2014 by the authors; licensee MDPI, Basel, Switzerland