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Performance Analysis of Vane Rotary Expander for $CO_2$ Cycles  

Kim, Ho-Young (Graduate School, University of Incheon)
Ahn, Jong-Min (Graduate School, University of Incheon)
Kim, Hyun-Jin (Department of Mechanical Engineering, University of Incheon)
Cho, Sung-Oug (Digital Appliance Network Business, Samsung Electronics CO.)
Publication Information
Korean Journal of Air-Conditioning and Refrigeration Engineering / v.21, no.1, 2009 , pp. 55-62 More about this Journal
Abstract
Relatively low cycle performance of a conventional $CO_2$ system is partly due to significant increase in friction loss in the expansion process, since the pressure drop across the expansion device is considerably large compared to a conventional refrigeration cycle. To recover friction loss and increase refrigeration effect by providing isentropic expansion, a rotary vane type expander has been designed. Performance of the designed expander has been investigated by numerical simulation. With the pressure condition of 9 MPa/4.5 MPa and inlet temperature of $35^{\circ}C$, volumetric, isentropic, and mechanical efficiencies of the expander are calculated to be 58.1%, 101.1%, and 78.8%, respectively, resulting in total expander efficiency of 46.3%. With this expander, COP of a $CO_2$ refrigeration cycle is estimated to be improved by about 14%.
Keywords
Expander; Vane rotary; Expansion loss; COP; Efficiency;
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