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R32/R152a 혼합작동유체를 적용한 해양온도차발전사이클 성능 특성
이호생(H. S. Lee),김현주(HJ. Kim),차상원(S. W. Cha),이승원(S. W. Lee) 한국해양환경·에너지학회 2013 한국해양환경·에너지학회 학술대회논문집 Vol.2013 No.11
우수한 열역학적 성질들로 인해 1930년대부터 사용하던 염화불화탄소(CFC) 및 수소화염화불화탄소(HCFC)가 오존층 붕괴의 주원으로 밝혀짐에 따라, 몬트리올의정서에 따라 기존에 사용하던 CFC, HCFC계열의 냉매들은 사용이 규제되고 이를 해결하기위한 대체냉매의 개발이 시급한 상황이다. 이를 해결하기 위한 방법으로는 신 냉매제작 또는 기존의 냉매를 혼합하여 사용하는 방법이 있다. 본 논문에서는 기존의 냉매를 혼합하여 해양온도차발전에 적용하였을 때에 그에 따른 사이클의 성능특성에 대해 연구를 하였다. 다양한 혼합작동유체 중 산업용 히트펌프에 연구 중인 R32/R152a를 해양온도차발전에 적용하였다. 사이클로는 기존의 밀폐형사이클, 암모니아/물 혼합물에 적용하고 있는 칼리나 사이클에 대해 시뮬레이션 해석을 수행하였다. 온열원의 온도는 26℃, 냉열원의 온도는 5℃를 적용하였다. R32를 적용한 밀폐사이클의 출력은 22kW, 사이클의 효율은 2.02%를 보였다. 혼합작동유체를 적용하였을 때에 R32/R152a(67%:33%)의 출력은 23.24kW, 사이클 효율은 2.26%로 기존의 단일 냉매보다 5.6%, 사이클효율은 11%상승함을 확인 하였다. 칼리나 사이클 또한 위와 같은 방법으로 연구를 수행하였다. It has been discovered that chlorofluorocarbon(CFC) and hydrochlorofluorocarbon(HCFC) which had been used since 1930 caused ozone layer depletion due to high thermodynamics characteristics. Series of CFC and HCFC refrigerants were regulated according to the Montreal Protocol. Therefore, development of an alternative refrigerant urgently needs to resolve ozone layer depletion. There are two ways to resolve the problem; Development of a new refrigerant and mixed refrigerants. In this paper, performance characteristics of cycles was studied when mixed existing refrigerants were used for ocean thermal energy conversion (OTEC). Among the various mixed refrigerants for industrial heat-pump, R32/R152a used in ocean thermal energy conversion system. For simulations, R32/R152a were used in existing closed cycle and Kalina cycle which is used only ammonia and water as mixed refrigerant. Temperature of the warm heat source was 26 celcius degree, temperature of the cold heat source was 5 celcius degree. In results of simulation, Gross power of the closed cycle on R32 was 22kW, and efficiency of the cycle was 2.02%. When the mixed refrigerant of R32/R152a, in the ratio of 67 to 33, gross power of the closed cycle was 23.24kW, and efficiency of the cycle was 2.26%. Gross power and cycle efficiency of R32/R152a increased by 5.6% and 11% than those of existing single refrigerant. Additionally, the same simulations were conducted in Kalina cycle with the same various composition ratio of mixed refrigerant.
이호생 (H. S. Lee ),오승택 (S. T. Oh ),김현우 (H. W. Kim ),최원재 (W. J. Choi ),윤정인 (J. I. Yoon ),이상규 (S. G. Lee ) 한국동력기계공학회 2009 한국동력기계공학회 학술대회 논문집 Vol.2009 No.6
In this study, modified cascade cycles which are two staged Intercooler and pre-expander types are simulated and designed, then compared performance with basic cascade process which is the base in liquefaction process. These are included methane, ethylene and propane cycles. The COP of two staged intercooler type and pre-expander type were showed about 12.6% and 23.6% higher than basic cascade process, and specific power was decreased about 28.0%.
해수 히트펌프시스템을 이용한 냉동법 담수화시스템 성능해석
이호생(Ho-Saeng Lee),이승원(Seung-Won Lee),윤정인(Jung-In Yoon),김현주(Hyeon-Ju Kim) 한국마린엔지니어링학회 2010 한국마린엔지니어링학회 학술대회 논문집 Vol.2010 No.10
In this study, a freeze desalination cycle with seawater heat pump system is simulated and designed for the basic data for the design of freeze desalination system. The basic model of seawater heat pump system is refrigeration cycle and indirect freeze desalination method is used for seawater desalination. The cycle performance of seawater heat pump such as COP, compressor work, condensing capacity was analyzed and the desalination performance such as fresh water productivity and energy per unit fresh water productivity were compared with respect to the seawater temperature of condenser inlet and ice ratio in the evaporator. The compressor work and condensing capacity decreased with respect to the increase of seawater inlet temperature. The energy per unit fresh water productivity in case of 8℃ seawater inlet temperature showed 28.9% lower than that of 20℃.
탄화수소계 냉매용 열펌프의 성능특성에 관한 실험적 연구
이호생(H.S.Lee),차동안(D.A.Cha),김재돌(J.D.Kim),한인근(I.G.Han),윤정인(J.I.Yoon) 한국마린엔지니어링학회 2003 한국마린엔지니어링학회 학술대회 논문집 Vol.2003 No.-
Performance of a heat pump using hydrocarbon refrigerants are experimentally investigated. The working fluids for this study are R-290(propane), R-600a(iso-butane) as a natural refrigerant and HCFCs refrigerant R-22. The experimental apparatus is a conventional vapor compression type heat pump system. The performance of each refrigerant are obtained under several compressor speeds and the change temperature levels of secondary heat transfer fluids. The compressor work increased as the evaporating temperature increased and were a little higher using hydrocarbon refrigerant than HCFCs refrigerant. The increasement of refrigeration capacity with hydrocarbon refrigerant were better than R-22 according to the evaporating temperature. And COP increased linearly as evaporating temperature increased and showed the highest value when R-600a(iso-butane) was used as a working fluid. Experimental results showed some hydrocarbon refrigerants had better characteristics than R-22, that is, the natural refrigerants can be used as substitute for R-22.<br/> <br/>