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Part-load Performance of a Screw Chiller with Economizer using R22 and R407C  

Chang, Young-Soo (Thermal/Flow Control Research Center, KIST)
Kim, Young-Il (Department of Energy System Engineering, Chungju University)
Lee, Yong-Chul (Thermal/Flow Control Research Center, KIST)
Publication Information
International Journal of Air-Conditioning and Refrigeration / v.13, no.1, 2005 , pp. 1-10 More about this Journal
Screw compressor chillers are widely used in refrigeration for capacity over 30 RT. In general, chillers operate under part-load conditions during most of the time. Therefore, information on the characteristics of part-load is very important for better chiller performance and energy economy. In this study, performance tests of screw chiller with economizer using R22 and R407C under part-load conditions have been performed for various secondary fluid temperatures. Adoption of an economizer system increased the cooling capacity and improved COP except for lower part-load condition when economizer volume ratio is 1.01. For the same cooling capacity condition at part-load, COP's of both non-economizer and economizer system showed similar values.
Screw chiller; Part-load; Economizer; R22; R407C;
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