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주거용 직접순환식 수직밀폐형 지열원 열펌프의 연간 운전성능 평가
김민성(Kim Min-sung),백영진(Baik Young-Jin),라호상(Ra Ho-Sang) 한국태양에너지학회 2012 한국태양에너지학회 논문집 Vol.32 No.3
Vertical closed-loop ground source heat pump systems(GSHP) have been installed widely in Korea since it can extract moderate temperature level of geothermal heat in a small area. As a ground heat exchanger, a vertical closed-loop type with brine circulation is mostly preferred since it is simple and less harmful to ground environment. However, it requires a secondary heat exchange loop between the refrigerant in a heat pump and the brine. By adding a geothermal heat exchanger in the secondary heat exchange loop. circulation pumps should be attached and the temperature difference between refrigerant and ground is increased, which are important parts of performance degradation. In this paper, annual and seasonal performances of direct expansion(DX) geothermal heat pump were estimated mathematically as an alternative of classical indirect geothermal heat pump based on the annual performance evaluation. As results, DX geothermal heat pump showed 43% higher annual performance than the classical U-tube geothermal heat pump.
유한한 열용량의 열원 및 열침 조건에서 열기관의 출력 극대화
백영진(Young-Jin Baik),김민성(Minsung Kim),장기창(Ki-Chang Chang),이영수(Young-Soo Lee),라호상(Ho-Sang Ra) 대한설비공학회 2011 설비공학 논문집 Vol.23 No.8
In this study, the theoretical maximum power of a heat engine was investigated by sequential Carnot cycle model, for a low-grade heat source of about 100℃. In contrast to conventional approaches, the pattern search algorithm was employed to optimize the two design variables to maximize power. Variations of the maximum power and the optimum values of design variables were investigated for a wide range of UA(overall heat transfer conductance) change. The results show that maximizing heat source utilization does not always maximize power.
산업용 압축/흡수식 하이브리드 히트펌프 시스템의 운전특성에 관한 실험적 연구
김지영(Jiyoung Kim),박성룡(Seong-Ryong Park),김민성(Minsung Kim),백영진(Young-Jin Baik),장기창(Ki-Chang Chang),라호상(Ho-Sang Ra),김용찬(Yongchan Kim) 대한기계학회 2012 대한기계학회 춘추학술대회 Vol.2012 No.11
In industrial process plants, there is an large amount of waste heat that will not be utilized because the temperature is too low. The purpose of this study is the development of a heat pump system that can be upgraded post-processed waste heat into 90℃ of reheated water using low temperature industrial waste heat. This study, heat pump system is based on a combination of compression and absorption cycles. This compression/absorption hybrid heat pump provides a number of advantages over conventional vapor compression heat pumps. These include a large temperature glide, an improved temperature lift, a flexible operating range, and capacity control. In this study, the effect of the operation characteristics of the compression/absorption hybrid heat pump was experimentally observed.