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유한한 열용량의 열원 및 열침 조건에서 열기관의 출력 최적화
백영진(Young-Jin Baik),김민성(Minsung Kim),장기창(Ki-Chang Chang),이영수(Young-Soo Lee),라호상(Ho-Sang Ra) 대한설비공학회 2011 대한설비공학회 학술발표대회논문집 Vol.2011 No.7
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. Variation of the maximum power and the optimum values of design variables was also investigated for a wide range of UA(overall heat transfer conductance) change. The results show that the maximizing heat source utilization not always maximize power.
해수열원 스크류 히트펌프의 연간 난방운전 성능 시뮬레이션
백영진(Baik Young-Jin),김민성(Kim Minsung),장기창(Chang Ki-Chang),강병찬(Kang Byung-Chan),라호상(Ra Ho-Sang),김현주(Kim Hyeon-Ju) 한국태양에너지학회 2012 한국태양에너지학회 학술대회논문집 Vol.2012 No.3
In this study, in order to utilize the seawater as a heat source at Gangneung city near the East Sea in Korea, an annual heating performance of a screw heat pump was simulated. For a simulation, the maximum heating capacity of heat pump was assumed at 3.5 MW. An ambient temperature at Gangneung city was calculated from the TMY2 weather data, while the seawater temperature was calculated from the regression equation based on the measurement by the National Fisheries Research and Development Institute of Korea. The heating load was assumed linearly dependent on the ambient temperature, while the maximum heating load was assumed to appear when the ambient temperature is below -2.4 ℃, which is the temperature of TAC 2.5% for heating at Gangneung city. A heat pump performance at full-load was calculated from the regression equation, which involves refrigerant's evaporating and condensing temperatures, based on a commercial screw compressor performance map. A heating supply temperature which determines refrigerant's condensing temperature was assumed linearly dependent on the heating load. A performance degradation due to the part-load operation of heat pump was also considered. Simulation results show that an annual heating coefficient of performance (COPh) of a seawater-source screw heat pump is approximately 2.8 and that it is necessary to improve part-load performance to increase an annual performance of the 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.
산업폐수열원 이용 증기압축식/흡수식 하이브리드 히트펌프 시스템의 시뮬레이션
백영진,박성룡,장기창,라호상 대한설비공학회 2004 설비공학 논문집 Vol.16 No.12
In this study, in order to utilize the waste heat of industrial wastewater in the range of the relatively low temperature of 40∼50℃ as a heat source, a hybrid heat pump system was considered by computer simulation method. In the simulation, an absorber, desorber and solution heat exchanger were modelled by UA values while a compressor and pump performance were specified by an isentropic efficiency. Simulation results show that the performance of hybrid heat pump can be up to 80% higher than that of conventional R134a heat pump when it makes a process hot water of 90℃ while the wastewater is cooled down to 20℃. As the absorber pressure increases, the system performance and desorber pressure increase with a favorable effect of a compressor discharge gas temperature drop.
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.
이영인,이승훈,김윤진,이상엽,이정규,이유현,조영혜,탁영진,박은주,김규리,라영진,최정인,이새롬,권력준,손수민 대한가정의학회 2022 Korean Journal of Family Practice Vol.12 No.3
연구배경: 여성 흡연자는 남성 흡연자와 다른 특성을 가지고 있다. 이 연구의 목적은 여성 흡연자의 금연 성공과 관련된 요인을 조사하는 것이다. 방법: 본 연구는 2015년 6월 1일부터 2017년 12월 31일까지 일개 지역 금연센터의 찾아가는 금연지원서비스 프로그램을 이용한 여성흡연자 1,118명을 대상으로 하였다. 자료는 국가금연지원센터에서제공하였다. 6개월 금연 성공 여부는 소변 코티닌 검사를 통해 확인했다. 결과: 다른 연령대에 비해 40대 이상에서 금연 성공률이 높았다. 총흡연 기간(odds ratio [OR], 0.94; 95% confidence interval [CI], 0.89–0.98), 니코틴 의존도(OR, 0.79; 95% CI, 0.69–0.91), 호기 일산화탄소농도(OR, 0.96; 95% CI, 0.91–1.01)는 6개월 금연 성공률과 음의 상관관계를 보였다. 첫 상담 시 금연에 대한 자신감(OR, 1.21; 95% CI,1.06–1.37)과 총 상담 횟수(OR, 1.51; 95% CI, 1.40–1.63)는 6개월 금연 성공률과 양의 상관관계를 보였다. 결론: 찾아가는 금연지원서비스 프로그램을 사용한 여성 흡연자의 6개월 금연 성공은 40세 이상, 짧은 흡연 기간, 낮은 니코틴 의존도,낮은 일산화탄소(carbon monoxide) 농도, 높은 금연 자신감, 높은 상담 횟수와 관련이 있었다.