The ionic liquid butylmethylimidazolium hexafluorophosphate (bmim)(PF6) and five different hydrofluorocarbon refrigerants were investigated as the working fluid pairs for a waste-heat driven absorption heat pump system for possible applications in electronics thermal management. A significant amount of the energy consumed in large electronic systems is used for cooling, resulting in low grade waste heat, which can be used to drive an absorption refrigeration system if a suitable working fluids can be identified. The Redlich–Kwong-type equation of state was used to model the thermodynamic conditions and the binary mixture properties at the corresponding states. The effects of desorber and absorber temperatures, waste-heat quality, and system design on the heat pump performance were investigated. Supporting experiments using R134a/(bmim)(PF6) as the working fluid pair were performed. Desorber and absorber outlet temperatures were varied by adjusting the desorber supply power and the coolant temperature at the evaporator inlet, respectively. For an evaporator temperature of 41 °C, which is relevant to electronics cooling applications, the maximum cooling-to-total-energy input was 0.35 with the evaporator cooling capability of 36 W and the desorber outlet temperature in the range of 50 to 110 °C.
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September 2012
Research-Article
Absorption Heat Pump/Refrigeration System Utilizing Ionic Liquid and Hydrofluorocarbon Refrigerants
Sarah Kim,
Sarah Kim
School of Chemical and Biomolecular Engineering,
Atlanta,
Georgia Institute of Technology
,Atlanta,
GA 30332
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Yoon Jo Kim,
Yoon Jo Kim
Department of Mechanical Engineering,
Vancouver,
Washington State University
,Vancouver,
WA 98686
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Andrei G. Fedorov,
Andrei G. Fedorov
The George Woodruff School of Mechanical Engineering,
Atlanta,
Georgia Institute of Technology
,Atlanta,
GA 30332
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Paul A. Kohl
Paul A. Kohl
1
School of Chemical and Biomolecular Engineering,
Atlanta,
e-mail: kohl@gatech.edu
Georgia Institute of Technology
,Atlanta,
GA 30332
e-mail: kohl@gatech.edu
1Corresponding author.
Search for other works by this author on:
Sarah Kim
School of Chemical and Biomolecular Engineering,
Atlanta,
Georgia Institute of Technology
,Atlanta,
GA 30332
Yoon Jo Kim
Department of Mechanical Engineering,
Vancouver,
Washington State University
,Vancouver,
WA 98686
Andrei G. Fedorov
The George Woodruff School of Mechanical Engineering,
Atlanta,
Georgia Institute of Technology
,Atlanta,
GA 30332
Paul A. Kohl
School of Chemical and Biomolecular Engineering,
Atlanta,
e-mail: kohl@gatech.edu
Georgia Institute of Technology
,Atlanta,
GA 30332
e-mail: kohl@gatech.edu
1Corresponding author.
Contributed by Electronic and Photonic Packaging Division of ASME for publication in the JOURNAL OF ELECTRONIC PACKAGING. Manuscript received March 12, 2012; final manuscript received June 26, 2012; published online July 20, 2012. Assoc. Editor: Amy Fleischer.
J. Electron. Packag. Sep 2012, 134(3): 031009 (9 pages)
Published Online: July 23, 2012
Article history
Received:
March 12, 2012
Revision Received:
June 26, 2012
Citation
Kim, S., Kim, Y. J., Joshi, Y. K., Fedorov, A. G., and Kohl, P. A. (July 23, 2012). "Absorption Heat Pump/Refrigeration System Utilizing Ionic Liquid and Hydrofluorocarbon Refrigerants." ASME. J. Electron. Packag. September 2012; 134(3): 031009. https://doi.org/10.1115/1.4007111
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