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Cooling Performance of Several $CO_2/propane$ Mixtures in an Air-Conditioning System  

Kim, Ju-Hyok (School of Mechanical and Aerospace Engineering, Seoul National University)
Kim, Min-Soo (School of Mechanical and Aerospace Engineering, Seoul National University)
Publication Information
Korean Journal of Air-Conditioning and Refrigeration Engineering / v.18, no.1, 2006 , pp. 47-54 More about this Journal
Abstract
[ $CO_2$ ] and propane mixtures were chosen as promising alternative refrigerants and their performance potentials were evaluated experimentally in an air-conditioning system. Pure $CO_2$ and 85/15, 75/25 and 60/40 binary blends by the charged mass percentage of $CO_2/propane$ were selected as working fluids. The effect of the inlet temperature of the secondary fluids and degree of superheat on the cooling performance was tested and discussed. The charging amounts of refrigerants were adjusted to make the system show the maximum COP. Comparisons among different refrigerants were carried out on the same compressor speed basis for a given operating condition. In addition, the temperature gliding effect of zeotropic mixtures on the system performance were analyzed based on the drop-in test results.
Keywords
Carbon dioxide; Propane; Zeotropic mixture; Degree of superheat; Temperature gliding effect;
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