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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.
이종 냉각수 활용 3중 열교환기 적용 전동식 냉방시스템 성능 특성 연구
이호성(Hoseong Lee),원종필(Jongphil Won),조중원(Choongwon Cho),임택규(Taekkyu Lim),전한별(Hanbyoel Jeon),남수병(Soobyeong Nam),김동균(Donggyun Kim),김용찬(Yongchan Kim) 한국자동차공학회 2016 한국자동차공학회 부문종합 학술대회 Vol.2016 No.5
The objective of this study was to investigate performance characteristics of the triple fluids heat exchanger with different temperature levels of coolants as a condenser in electric-driven air conditioning system. Tested triple fluids heat exchanger to transfer heat between a refrigerant and two kinds of coolants applied to fuel cell electric vehicles, stack coolant with 35% portion and electric device coolant with 65.0% portion of whole area, was developed to use selectively and concurrently coolant sources along with operating conditions due to different temperature levels. In order to analyze performance characteristics of the triple fluids heat exchanger with respect to heat transfer rate and pressure drop, electric-driven air conditioning system with two kinds of coolants was installed and tested under various operating conditions for coolants, such as temperature and volume flow rate. In addition, since developed heat exchanger was used in electric-driven air conditioning system for a fuel cell vehicle, air conditioning system’s performance characteristics with respect to cooling capacity and coefficient of performance (COP) was analyzed after various experiments with inlet air conditions of evaporator and compressor speed. Performance characteristics of tested triple fluids heat exchanger were affected more by the refrigerant flow rate which reflected various air conditioning system operations, such as ambient temperature and compressor speed, than coolant’s. The heat capacity and pressure drop of tested triple fluids heat exchanger with respect to stack coolant operating conditions were about 7.0 ㎾ and 10.0 ㎪ along with stack coolant temperature, respectively. Like stack coolant operating conditions, performance characteristics with the variation of coolants operating conditions was analyzed and optimal operating conditions for coolants was proposed to have better efficiency of tested air conditioning system.
상용차용 로타리 전동압축기 적용 하이브리드 냉방시스템 성능 특성 연구
이호성(Hoseong Lee),원종필(Jongphil Won),조중원(Choongwon Cho),임택규(Taekkyu Lim),전한별(Hanbyoel Jeon),한만승(Manseung Han),김정일(Jungil Kim),김용찬(Yongchan Kim) 한국자동차공학회 2017 한국자동차공학회 부문종합 학술대회 Vol.2017 No.5
The objective of this study was to investigate performance characteristics of hybrid cooling system with rotary type electric controlled compressor in a commercial vehicle. Tested hybrid cooling system had additionally the electric compressor besides present mechanical compressor to use selectively according to operating conditions. Applied electric compressor is rotary type and has 20.8 cc displacement. In order to analyze performance characteristics of hybrid cooling system with respect to cooling capacity and COP(Coefficient of Performance), other components including two different types of compressors were installed and tested under various operating conditions such as compressor speed and air flow rate of the evaporator. When the mechanical compressor was operated, while cooling capacity was higher than the electric controlled compressor, COP was lower due to larger displacement and higher power consumption. Therefore, to decrease cabin temperature quickly, mechanical compressor is operated at first and then to maintain under the required temperature, electric controlled compressor might be operated. Consequently, fuel consumption will be reduced because of efficient operation to control heat load of the cabin.
상용차 하이브리드 냉방시스템 운전 모드 변화에 대한 성능 특성 연구
이호성(Hoseong Lee),원종필(Jongphil Won),조중원(Choongwon Cho),임택규(Taekkyu Lim),전한별(Hanbyoel Jeon),한만승(Manseung Han),김정일(Jungil Kim),김용찬(Yongchan Kim) 한국자동차공학회 2018 한국자동차공학회 부문종합 학술대회 Vol.2018 No.6
The objective of this study was to investigate performance characteristics of hybrid cooling system with scroll type electric compressor in a commercial vehicle. Tested hybrid cooling system had additionally the electric compressor besides present mechanical compressor to use selectively according to operating conditions. Applied electric compressor is scroll type and has 18.0 ㏄ displacement. In order to analyze performance characteristics of hybrid cooling system with respect to cooling capacity and COP(Coefficient of Performance), other components including two different types of compressors were installed and tested under various operating conditions such as compressor speed and air flow rate of the evaporator. When the electric compressor was operated with 4,500 rev/min, cooling capacity was about 4.0㎾ and COP was 3.5. To analyze hybrid system operating characteristics due to reasonable cooling capacity with electric compressor operation, mechanical compressor and electric compressor was operated by turns every 10 minutes under certain system operating conditions. Because surge pressure was found when two compressors was switched, operating strategy was required to have some time to balance the system pressure.
최두열(Duyoul Choi),김철민(Chulmin Kim),이원석(Wonsuk Lee),원종필(Jongphil Won),이호성(Hoseong Lee),전한별(Hanbyoel Jeon) 한국자동차공학회 2016 한국자동차공학회 학술대회 및 전시회 Vol.2016 No.11
The main objective of this study is to improve efficiency of heat pump system on battery electric vehicle under low temperature. In general, the operating temperature of automobile heat pump is lower than that of housewares. For this reason, it is necessary that high efficient heat pump system should be developed in other approach for EV. Because refrigerant of R134a has high specific volume at low temperature, flow rate of refrigerant is reduced in a system. In order to resolve this problem, the vapor injection technologies are recommended in heat pump system. In this study, the primary components of heat pump system have been developed to organize the vapor injection heat pump system. The compressor power consumption was measured and the analysis of the heating performance & COP was conducted.