Exergy analysis of a novel air-cooled non-adiabatic absorption refrigeration cycle with NH3-NaSCN and NH3-LiNO3 refrigerant solutions

被引：30

作者：

Cai, Dehua ^{[1
]}

He, Guogeng ^{[1
]}

Tian, Qiqi ^{[1
]}

Tang, Weier ^{[1
]}

机构：

[1] Huazhong Univ Sci & Technol, Sch Energy & Power Engn, Wuhan 430074, Peoples R China

来源：

ENERGY CONVERSION AND MANAGEMENT | 2014年 / 88卷

基金：

中国国家自然科学基金;

关键词：

Non-adiabatic absorber; Exergy; Air-cooled absorption refrigeration; Low grade energy; Absorption efficiency; Ammonia-sodium thiocyanate; Ammonia-lithium nitrate; STANDARD CHEMICAL EXERGY; PLUS LITHIUM-NITRATE; 2ND LAW ANALYSIS; THERMODYNAMIC ANALYSIS; CONCENTRATED SOLUTIONS; HEAT-CAPACITIES; VAPOR-PRESSURE; LIQUID AMMONIA; WATER; OPTIMIZATION;

D O I：

10.1016/j.enconman.2014.08.025

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

This paper presents a methodology of exergy analysis for ammonia-lithium nitrate and ammonia-sodium thiocyanate absorption refrigeration cycle which applies a novel air-cooled type non-adiabatic absorber to improve both the coefficient of performance and exegetic efficiency of the system under air cooling condition. A modified entropy calculation method for NH3/NaSCN and NH3/LiNO3 solutions is presented in this literature and different results are obtained comparing to previous research. In addition to the variation of solution temperature and pressure from specific working state to the reference state, the variation of solution concentration, which was always neglected by previous researchers in ammonia/salt solution exergy calculation, has been taken into account while analyzing the least potential of ammonia/salt solution for doing useful work, and a corresponding approach for specific exergy calculation is presented. The effects of generator temperature, absorber outlet temperature, absorber efficiency and other system parameters on system exergetic efficiency have been discussed in this study. Analysis results indicate that relatively high system performance can be obtained by air-cooled type ammonia/salt absorption refrigeration cycles when non-adiabatic absorbers are applied in these systems. (C) 2014 Elsevier Ltd. All rights reserved.

引用

页码：66 / 78

页数：13

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