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수평관내 이산화탄소의 냉각열전달과 압력강하 특성에 관한 연구
손창효(Son C. H.),김종열(Kim J. R.),노건상(Roh G. S.),구학근(Ku H. G.),박기원(Park G. W.),오후규(Oh H. K.) 한국마린엔지니어링학회 2005 한국마린엔지니어링학회 학술대회 논문집 Vol.2005 No.-
This paper presents the heat transfer and pressure drop characteristics during cooling process of carbon dioxide in a horizontal tube. The test section is a tube in tube type heat exchanger with refrigerant flowing in the inner tube and water flowing in the annulus. It was made of a stainless steel tube with the inner diameter of 7.75[㎜], the outer diameter of 9.53[㎜] and length of 6000[㎜]. The refrigerant mass fluxes were 200~400[㎏/㎡s] and the average pressure varied from 7.5[㎫] to 10.0[㎫]. The main results were summarized as follows : The heat transfer coefficient of supercritical CO₂ increases in decrease of the gas cooler pressure. And the heat transfer coefficient increases with respect to the increase of the refrigerant mass flux. Among some correlations proposed in a transcritical region, Bringer-Smith's correlation has some analogy with experimental results. The pressure drop decreases in increase of the gas cooler pressure and increases with respect to increase the refrigerant mass flux.
표층수온도 변화에 따른 R717용 해양온도차발전 사이클의 성능 비교
김현욱(H.U.Kim),윤정인(J.I.Yoon),백승문(S.M.Baek),손창효(C.H.Son),김현주(H.J.Kim),이호생(H.S.Lee) 한국해양환경·에너지학회 2012 한국해양환경·에너지학회 학술대회논문집 Vol.2012 No.11
해양온도차발전 사이클 증발기에 유입되는 표층수 온도로 화력발전소에서 버려지는 35℃의 온배수를 이용하는 경우와 25℃의 해양 표층수를 이용하는 경우의 사이클 특성을 서로 비교한 후, 해양온도차 발전 사이클에 화력발전소에서 버려지는 온배수를 해양온도차발전 사이클에 적용 가능한 지를 확인한다. 주요 결과를 요약하면 다음과 같다. 화력발전소에 배출되는 35℃의 온배수를 표층수로 사용한 해양온도차발전 사이클의 효율이 25℃의 표층수를 적용한 해양온도차발전 사이클에 비해 89% 이상 높게 나타났다. 따라서 화력발전소의 온배수를 해양온도차발전 사이클에 적용할 수 있음을 확인할 수 있었다. This study was performed to find out the possibility that hot waste water from a thermoelectric power plant can be applied to OTEC power cycle by comparing the performance characteristics for use of the ocean surface water (25℃) and hot waste water (35℃). Main results of this study are summarized as follows : Overall efficiency of applying hot waste water (35℃) to OTEC is 89% higher than that of surface water (25℃). Thus it could be confirmed that hot waste water of the thermoelectric power plant can be applied to OTEC.
김현욱(H.U.Kim),윤정인(J.I.Yoon),최광환(K.H.Choi),손창효(C.H.Son),백승문(S.M.Baek),김현주(H.J.Kim),이호생(H.S.Lee) 한국태양에너지학회 2012 한국태양에너지학회 학술대회논문집 Vol.2012 No.11
In this paper, the performance analysis for condensation and evaporation capacity, total work and efficiency of 20kW ocean thermal energy conversion system using R744(CO2) is presented to offer the basic design data for the operating parameters of the system. The operating parameters considered in this study include evaporation and condensation temperature, pump and turbine efficiency. The main results were summarized as follows : when the condensation temperature is increased, the amount of heat of condensation and evaporation are increased. And when the condensation temperature is 15℃, total work and efficiency of system are reduced to 5% and 65% respectively, compared with the condensation temperature of 5℃. It is verified through this study that, in order to increase the efficiency of the system, condensation degree should be reduced and the degree of evaporation, increased.