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Simulation Study on the Performance Characteristics of a $CO_2$ Cooling System with an Expander  

Cho, Hong-Hyun (Graduate School, Department of Mechanical Engineering, Korea University)
Baek, Chang-Hyun (Graduate School, Department of Mechanical Engineering, Korea University)
Ryu, Chang-Gi (Hyundai & Kia Corporate R&D Division, Hyundai & Kia motor)
Kim, Yong-Chan (Department of Mechanical Engineering, Korea University)
Publication Information
Korean Journal of Air-Conditioning and Refrigeration Engineering / v.19, no.9, 2007 , pp. 630-639 More about this Journal
Abstract
A $CO_2$ cycle shows large throttling loss during the expansion process. The application of an expander into the $CO_2$ cycle can reduce the throttling loss and then improve system performance. In this study, the performance of a transcritical $CO_2$ cycle with an expander was analytically investigated in order to improve the cooling performance of the system. The expander was applied to the single-stage and two-stage compression cycles. The performance was analyzed with the variations of compressor frequency, outdoor temperature, and expander efficiency. The single-stage and two-stage compression cycles with the expander showed COP improvement of 25% and 32%, respectively, over the single-stage cycle with an EEV.
Keywords
Carbon dioxide; Transcritical cycle; Expander; Phase-separate cycle; Expander efficiency;
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