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김성준(S. J. Kim),안종민(J. M. Ahn),김현진(H. J. Kim) 한국동력기계공학회 2009 한국동력기계공학회 학술대회 논문집 Vol.2009 No.11
This paper introduces a conceptual design of a combined scroll expander-compressor unit for a fuel cell. Since air discharged out of the fuel cell stack has still high pressure energy, some power can be extracted from the air by directing it to pass through an expanding device. Such extracted power can be used to drive an auxiliary compressor. For this purpose, a scroll type expander coupled to a scroll type compressor was designed for a 1kW-class fuel cell. The orbiting scroll members of the expander and the compressor were made to share three of common drive shafts installed in the mid frame plate. Performance analysis for the combined expander-compressor unit showed that the installation of this unit could reduce the auxiliary power consumption in the fuel cell by about 42%.
김우영(Woo Y. Kim),안종민(Jong M. Ahn),김현진(Hyun J. Kim),조성욱(Sung O. Cho) 한국유체기계학회 2006 유체기계 연구개발 발표회 논문집 Vol.- No.-
Analytical investigation on the performance of a two stage twin rotary compressor for CO2 heat pump water heater cycle has been carried out with the aid of a computer simulation program. The simulation program was made based on analytical models for gas compression in control volumes, leakages among neighbouring volumes, and dynamics of moving elements of the compressor. Calculated cooling capacity, compressor input, and COP were well compared to those of experiments. For normal operating conditions various compressor efficiencies were calculated as follows: volumetric efficiencies were 89% and 82.7% respectively for the first and second stages. Adiabatic and mechanical efficiencies were around 90-96%, and 92.7%, respectively, resulting in the total compressor efficiency of about 80.2%.