NDLI: Waste-Heat Driven Miniature Absorption Refrigeration System Using Ionic-Liquid as a Working Fluid

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Kim, Yoon Jo Kim, Sarah Yogendra, K. Joshi Andrei, G. Fedorov Paul, A. Kohl
Copyright Year	2011
Abstract	An ionic-liquid (IL) is a salt in a liquid state usually with an organic cation and inorganic anion. ILs provide an alternative to the normally toxic working fluids in absorption systems, such as the ammonia/water system. They also eliminate the problems of poor temperature match, crystallization and metal-compatibility problems of the water/LiBr system. In the present study, an IL is explored the working fluid of a miniature absorption refrigeration system so as to utilize waste-heat within the system for low-cost, high-power electronics cooling. To determine performance benchmarks for the refrigerant/IL (e.g. [bmim][PF6]) pairs, system-level simulations have been carried out. An NRTL model was built and used to predict the solubility of the mixture as well as the mixture properties such as enthalpy and entropy. The properties of the refrigerants were determined using REFPROP 6.0. Saturation temperatures at the evaporator and condenser were 25°C and 50°C, respectively. Chip power was fixed at 100 W with the operating temperature set at 85°C. R32 gave the highest operating efficiency with the maximum coefficient of performance (COP) of ca. 0.55 while R134a and R152a showed comparable performance with the maximum COP of ca. 0.4 at the desorber outlet temperature of 80°C. When waste-heat is available for the system operation, R134a and R152a COPs were comparable or better than that of R32.
Sponsorship	Advanced Energy Systems Division and Solar Energy Division
Starting Page	1299
Ending Page	1305
Page Count	7
File Format	PDF
ISBN	9780791854686
DOI	10.1115/ES2011-54217
Volume Number	ASME 2011 5th International Conference on Energy Sustainability, Parts A, B, and C
Conference Proceedings	ASME 2011 5th International Conference on Energy Sustainability
Language	English
Publisher Date	2011-08-07
Publisher Place	Washington, DC, USA
Access Restriction	Subscribed
Subject Keyword	Water Temperature Condensers (steam plant) Enthalpy Metals Crystallization Computer cooling Entropy Fluids Absorption Simulation Engineering simulation Refrigeration Waste heat Refrigerants Operating temperature
Content Type	Text
Resource Type	Article

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