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루버 핀 열교환기를 가지는 자동차용 히트펌프 시스템의 착상 특성 연구
임홍영(Hong Young Lim),송준영(Junyoung Song),신성홍(Sunghong Shin),김학규(Hakkyu Kim),오광헌(Kwanghun Oh),최영돈(Youngdon Choi) 한국자동차공학회 2013 한국자동차공학회 부문종합 학술대회 Vol.2013 No.5
The present study investigated the heating performance and frosting phenomenon of the heat pump system for vehicle, which is being developed to increase fuel efficiency of EV(Electric Vehicle) with maintaining thermal comfort. The experimental setup of a heat pump system consists of an electric compressor, an exterior louvered fin-flat tube condenser, an interior condenser, and an evaporator, block type thermal expansion valve and reservoir tank, which are used in actual HVAC system for vehicle. In this study, frosting phenomenon patterns of outside condenser having uniform air flow rate was visualized and heat pump performance is examined experimentally. In addition, the frosting phenomenon is compared with different compressor rpm. As results, non-uniform frosting phenomenon and non-frosting area in exterior condenser was occurred. The heating performance based on air side of interior condenser outlet was maximized within 4min. The heating performance was reduced 5.3% after 27min and 42% after 90min because of frosting in exterior condenser.
전기차 폐열 활용을 위한 수직 유동이 적용된 오프셋 스트립 핀 열교환기에서의 열성능 분석
김준혁(Jun Hyuk Kim),임홍영(Hong Young Lim),신성홍(Sung Hong Shin),오진우(Jin Woo Oh),박윤재(Yun Jae Park),이호성(Hoseong Lee) 대한설비공학회 2022 대한설비공학회 학술발표대회논문집 Vol.2022 No.11
In this study, thermal performance of the offset strip fin heat exchanger (OSFHX) with a perpendicular flow is experimentally investigated to improve the heat pump system of electric vehicles. The waste heat of electric vehicles is recovered through the coolant-side of the OSFHX and transferred to the heat pump through the refrigerant-side of the heat exchanger. The heat transfer coefficient of the coolant-side was obtained using the modified Wilson plot method, and that of the refrigerant-side was calculated based on the overall heat transfer coefficient. As a result of the baseline, the heat transfer capacity of the OSFHX was measured as 8 kW. When it comes to the heat transfer of both fluids, the heat transfer coefficient of the refrigerant-side was 67% smaller than that of the coolant-side. Throughout the modification of flow configuration, the heat transfer coefficient can be improved by 22%, and it resulted in a 10% increase in heat transfer capacity.
전기차 폐열 활용을 위한 오프셋 스트립 핀 열교환기에서의 열성능 분석
김준혁(Jun Hyuk Kim),임홍영(Hong Young Lim),신성홍(Sung Hong Shin),오진우(Jin Woo Oh),한욱민(Uk Min Han),박윤재(Yun Jae Park),이소라(Sora Lee),이호성(Hoseong Lee) 대한설비공학회 2022 대한설비공학회 학술발표대회논문집 Vol.2022 No.6
In this study, a new type of heat exchanger performance analysis was conducted. The new type of heat exchanger is a perpendicular flow offset strip fin type and is a multi-heat source heat exchanger, which is a different type of heat exchanger. The working fluid was R1234yf and the coolant was 50% ethylene glycol. In conclusion, The heat transfer coefficient of the coolant was obtained using the Modified Wilson plot method, and an appropriate value was obtained with an error of 1.3% from the experimental value. The heat transfer coefficient of the refrigerant was obtained by utilizing this coolant heat transfer coefficient. As a result, it was found that the offset trip fin type applied as a perpendicular flow had a large effect on the pressure drop. And as a result of comparing the heat transfer coefficients of the refrigerant and the coolant, the heat transfer coefficient of the refrigerant was 67% smaller than the heat transfer coefficient of the coolant.