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백수황(Soowhang Baek),한만승(Manseung Han) 한국자동차공학회 2018 한국자동차공학회 지부 학술대회 논문집 Vol.2018 No.5
This study describes the development of a smart integrated air conditioning system for EV commercial vehicle of less than 1 ton electric truck which is used in the field of delivery which can be commercialized in electric vehicle. In order to increase the market share of electric vehicles in competition with existing vehicles, it is necessary to exhibit excellent driving performance even in conditions of hot and cold. In this study, we developed a high efficiency smart heat pump air conditioning system to improve the characteristics of the vehicle.
EV 상용차용 히트펌프 시스템 냉방 성능 특성에 관한 연구
전한별(Hanbyeol Jeon),원종필(Jongphil Won),조중원(Choongwon Cho),임택규(Taekkyu Lim),한만승(Manseung Han),김종인(Jongin Kim),이호성(Hoseong Lee) 한국자동차공학회 2019 한국자동차공학회 부문종합 학술대회 Vol.2019 No.5
The cooling performance evaluation of heat pump system for light-duty commercial electric vehicle was studied experimentally. In order to identify the cooling performance characteristics of the heat pump for light-duty commercial electric vehicles, it was evaluated by varying the temperature, flow rate of chiller coolant, and electric compressor speed, under the exterior air temperature of 35°C and interior air temperature of 25°C. Increasing the compressor speeds shows the cooling capacity of the system increases by 7.5% on average, and the compressor work by 27% on average. As a result, the system COP(coefficient of performance) decreases by 14.5% on average. Increasing the temperature of chiller coolant shows the cooling capacity of the system increases by 0.07 kW on average, and the compressor work by the compressor increases by 0.15 kW on average. As a result, the system COP decreases by 8.7% on average. Increasing the flow rate of chiller coolant show the cooling capacity of the system increases by 0.03% on average, and the compressor work by the compressor increases by 0.04% on average. As a result, the system COP does not change.
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.
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.