Thermodynamic analysis of an absorption refrigeration system with ionic-liquid/refrigerant mixture as a working fluid

被引：141

作者：

Kim, Yoon Jo ^{[1
]}

Kim, Sarah ^{[2
]}

Joshi, Yogendra K. ^{[3
]}

Fedorov, Andrei G. ^{[3
]}

Kohl, Paul A. ^{[2
]}

机构：

[1] Washington State Univ Vancouver, Dept Mech Engn, Vancouver, WA 98686 USA

[2] Georgia Inst Technol, Sch Chem & Biomol Engn, Atlanta, GA 30332 USA

[3] Georgia Inst Technol, George W Woodruff Sch Mech Engn, Atlanta, GA 30332 USA

来源：

ENERGY | 2012年 / 44卷 / 01期

关键词：

Ionic liquid; Absorption system; Waste-heat; Electronics cooling; LIQUID-EQUILIBRIA; SOLUBILITY; SOLVENTS; DESIGN;

D O I：

10.1016/j.energy.2012.04.048

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

Thermodynamics of an ionic-liquid (IL) based absorption refrigeration system has been numerically analyzed. It provides an alternative to the normally toxic working fluids, such as the ammonia in conventional absorption systems. The use of ILs also eliminates crystallization and metal-compatibility problems of the water/LiBr system. Mixtures of refrigerants and imidazolium-based ILs are theoretically explored as the working fluid pairs in a miniature absorption refrigeration system, so as to utilize waste-heat to power a refrigeration/heat pump system for electronics cooling. A non-random two-liquid (NRTL) model was built and used to predict the solubility of the mixtures. Saturation temperatures at the evaporator and condenser were set at 25 degrees C and 50 degrees C, respectively, with the power dissipation of 100 W. Water in combination with [emim][BF4] (1-ethyl-3-methylimidazolium tetrafluoroborate) gave the highest coefficient of performance (COP) around 0.9. The refrigerant/IL compatibility indicated by the circulation ratio, alkyl chain length of the IL, and thermodynamic properties of the refrigerants, such as latent heat of evaporation were proven to be important factors in determining the performance of the absorption system. The negative effect of high viscosity was mitigated by dilution of the IL with the refrigerant and the use of slightly larger microfluidic channel heat exchangers. (C) 2012 Elsevier Ltd. All rights reserved.

引用

页码：1005 / 1016

页数：12

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