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분사노즐을 이용한 빙축수 순환방식과 주름관을 이용한 빙축열 냉각 시스템 구현
용민철(Minchul Yong),예병효(Byunghyo Ye),김청래(Cheongrae Kim),박찬정(Chanjung Park) 대한기계학회 2017 대한기계학회 춘추학술대회 Vol.2017 No.11
With the introduction of direct water purification system in water purifier, the necessity of cold water using instantaneous cooling method is emerging. The ice storage system was used in this study as a method of cooling purified water to below 10℃ through a filter. The circulation of the cooling water inside ice storage system was optimized by using the injection nozzle. A corrugated SUS tube was used to increase the cooling efficiency making cold water. Using the above technique, we developed a direct water purifier capable of realizing the lowest temperature.
[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.