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[논문] 재열기, 재생기, 다단 터빈을 가진 20kW급 CO₂용 OTEC 발전사이클의 성능 특성
김현욱(Hyeon-Uk Kim),예병효(Byung-Hyo Ye),김지욱(Ji-Uk Kim),윤정인(Jung-In Yoon),손창효(Chang-Hyo Son) 대한기계학회 2013 대한기계학회 춘추학술대회 Vol.2013 No.5
This paper presents the analysis for the performance characteristics of a 20kW OTEC power cycle with a regenerator, a reheater and multi-stage turbine in order to improve the efficiency of the closed OTEC power cycle. With the variation of high turbine outlet pressure and pressure drip in a evaporator and condenser, and turbine and pump efficiency, the performance characteristics of OTEC power cycle was analyzed by using HYSYS software. The ocean surface water of 25℃ is supplied as the heat source to the evaporator and deep ocean water of 4℃ is used to condense the working fluid. CO2 which is a natural refrigerant was used as the working fluid. As a result of determining the compression ratio of each turbine at which the OTEC power cycle proposed in this paper has the best efficiency, this OTEC power cycle yielded the highest efficiency when outlet pressure of high-stage turbine is 5600 kPa(compression ratio 1.09), outlet pressure of middle-stage turbine is 5200 kPa(compression ratio 1.05), and outlet pressure of low-stage turbine is 4100 kPa(compression ratio 1.25). And, Efficiency of the OTEC power cycle is most affected by the efficiency of the turbine and pump.
습냉매를 적용한 증기-증기 이젝터용 OTEC 시스템의 성능비교
윤정인(Jung-In Yoon),손창효(Chang-Hyo Son),김영복(Young-Bok Kim),예병효(Byung Hyo-Ye),하수정(Su-Jeong Ha),이호생(Ho-Saeng Lee),김현주(Hyeon-Ju Kim) 한국태양에너지학회 2014 한국태양에너지학회 논문집 Vol.34 No.4
In this paper, OTEC(Ocean Thermal Energy Conversion) system with vapor-vapor ejector is newly proposed. And 6 wet refrigerants are applied into the proposed OTEC system for performance comparison. The results of comparison performance are as follows. In the view of system efficiency, R32/R744(90:10) has the highest efficiency among the 6 refrigerants. In case of evaporation capacity, pump work and mass flow rate of working fluid, R744, R717 and R717 is lowest value, respectively. As this results, the vapor-vapor ejector is able to increase the efficiency of system. And It is necessary to select the optimized working fluid considering environmental and economic factors.