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장영기(Youngki Chang),김미로(Miro Kim),안병재(Byungjae Ahn) 한국자동차공학회 2010 한국자동차공학회 학술대회 및 전시회 Vol.2010 No.11
The thermal performance is one of the most important factors in evaluating an automotive lamp, and is not easy for engineer to improve due to the diversified lamp designs. Achieving a better thermal performance in automotive lamps requires that every component consisting of the lamp such as reflector, bezel, lens, etc maintains its shapes and colors without any deforming or fading from the heat transfer of the bulb. It has been a courtesy that its thermal performance has been verified with experiments and CFD after the design is complete. However, the shortening automobile development period and the frequent changes in design corrupt the effectiveness of the test procedure in the thermal performance. In this study, nine factors of thermal performance were chosen and evaluated their effects on thermal performance. Among them, three main factors were studied to attain thermal performance using CFD. On the completion of this study, it is expected that the thermal performance of automotive lamps can be achieved before the stage of the thermal experiment and CFD.
공기 열원을 활용한 전기자동차 난방 시스템 실험적 연구
전한별(Hanbyoel Jeon),이호성(Hoseong Lee),원종필,조중원(Choongwon Cho),장영기(Youngki Chang),임택규(Taekkyu Lim),신은성(Eunsung Shin) 한국자동차공학회 2014 한국자동차공학회 학술대회 및 전시회 Vol.2014 No.11
In this situation, because the electrical energy must be spent for heating, electric vehicles reduced Driving range per charge. Heating performance is studied for air heat source heat pump system. In this study, experiment to analyze heating performance characteristics with air heat source has been done with various operating conditions, which are likely to match the air-sourced heat pump system under cold ambient conditions, such as variation of compressor speed. When ambient temperature downed from 5℃ to ?10℃ , heat capacity decreased by 54% due to reduction of refrigerant flow rate in accordance with decrease of 45% density of refrigerant. When the compressor speed increased from 2000 RPM to 3,500 RPM, heating capacity increased by 40% due to higher refrigerant mass flow rate. However, COP of heat pump system is reduced by 26% due to additional compressor power. To improve air-sourced heat pump system’s heat capacity, after simulations with the variation of operating conditions were performed, it seemed a good way to increase the compressor revolutional speed to cope with comfort level in the cabin even though heating system had a little loss with respect to COP.