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Experimental Study on the Cooling Performance of a Variable Speed $CO_2$ Cycle with Internal Heat Exchanger and Electronic Expansion Valve  

Cho Honghyun (Graduate School of Mechanical Engineering, Korea University)
Ryu Changgi (Graduate School of Mechanical Engineering, Korea University)
Kim Yongchan (Department of Mechanical Engineering, Korea University)
Publication Information
Korean Journal of Air-Conditioning and Refrigeration Engineering / v.17, no.3, 2005 , pp. 209-215 More about this Journal
Abstract
Since a transcritical $CO_2$ cycle shows lower performance than conventional air conditioners in the cooling mode operation, it is required to enhance the performance of the $CO_2$ cycle by applying advanced technologies and optimizing components. In this study, the cooling performance of a $CO_2$ system measured by varying refrigerant charge amount, compressor frequency, EEV opening and length of internal heat exchanger. As a result, the cooling COP of the basic system without internal heat exchanger was 2.1. The cooling performance of the modified cycle applying internal heat exchanger improved by $4-9\%$ over the basic cycle.
Keywords
Carbon dioxide; Transcritical cycle; Internal heat exchanger(IHX); Electronic expansion valve(EEV);
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