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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.
이호성(Ho-Seong Lee),전한별(Hanbyeol Jeon),김정일(Jung-Il Kim),이무연(Moo-Yeon Lee) 한국산학기술학회 2019 한국산학기술학회논문지 Vol.20 No.1
본 연구의 목적은 상용차 운행 시, 야간 및 운휴중에 냉방시스템을 운전하기 위하여서, 기계식과 전동식 압축기를 적용한 하이브리드 냉방시스템에 대한 냉방성능 특성을 분석하는 것이다. 기계식압축기는 170cc의 왕복동 형식이고, 전동식 압축기는 18cc 스크롤 형식이다. 전동식 압축기는 운휴시나 야간에 사용할 목적으로 적용되었기 때문에, 냉방용량은 기계식 압축기 대비 낮은 성능을 가지고 있다. 기계식 압축기를 사용하였을 경우, 6.0kW 수준의 냉방성능을 보이고 있고, 시스템 효율은 2.0이하의 결과를 가졌다. 반면, 전동식 압축기는 냉방성능 4.0kW수준, 시스템 효율은 3.5 수준을 가지고 있었다. 본 연구에서는 전동식 압축기는 냉방성능 4.0kW수준, 시스템 효율은 3.5 수준을 가지고 있었다. 기계식 압축기와 전동식 압축기를 운전조건에 따라서, 선택적으로 운전하는 것을 고려하였기 때문에, 운전모드가 바뀔 때의 시스템 특성을 분석하기 위하여서, 운전모드 변경에 대한 영향을 알아보았다. 운전모드가 변경될 때, 토출압력이 일시적으로 증가하는 경향을 보이는데, 안정적인 운전을 위하여서, 외기 부하 등을 고려한 운전모드 변경 로직에 대한 연구가 필요할 것으로 판단된다. The objective of this study was to investigate the cooling performance characteristics of a hybrid refrigeration system in a heavy duty vehicle. The tested hybrid refrigeration system had additionally an electric compressor besides the present mechanical compressor for selective use according to the operating conditions. The applied electric compressor was a scroll type and with 18.0 cc displacement. In order to analyze the performance characteristics of the hybrid refrigeration system with respect to the cooling capacity and Coefficient of Performance (COP), 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 at 4,500 rev/min, the cooling capacity was about 4.0kW and COP was 3.5. When the mechanical compressor was operated, whereas the cooling capacity was higher than the electric controlled compressor, COP was lower due to the larger displacement and higher power consumption. To analyze the hybrid system operating characteristics due to reasonable cooling capacity with electric compressor operation, the mechanical compressor and electric compressor were operated by turns every 10 minutes under certain system operating conditions. Because surge pressure occurred when both compressors were switched on, the operating strategy required some time to balance the system pressure.
전기자동차 히트펌프용 수열원 응축기 성능 특성에 관한 연구
이호성(Hoseong Lee),전한별(Hanbyeol Jeon),조중원(Choongwon Cho),임택규(Taekkyu Lim),이성제(Sungje Lee),남광우(Kwangwoo Nam) 한국자동차공학회 2020 한국자동차공학회 학술대회 및 전시회 Vol.2020 No.11
The performance characteristics of coolant-source plate heat exchanger for heat pump system in electric vehicles was studied experimentally. In order to analyze plate heat exchanger with the coolant operating PE(Power Electronics) thermal management, coolant conditions was varied with respect to temperature, volume flow rate. Because the refrigerant in MAC(Mobile Air Conditioning) was about to be changed in our country, performance experiments were carried out for present(R-134a) and alternative(R-1234yf) refrigerants. With increasing coolant volume flow rate in plate heat exchanger, heat rejection rate increased due to refrigerant mass flow rate increment. While heating capacity of R-134a was increased by 78%, that of R-1234yf was increased by 67.5% due to lack of enthalpy difference in high pressure side. In case of coolant temperature, heating capacity with R-134a was decreased by 46.4% from 45℃to 53. 5℃. As a result, because changing refrigerant led to decrease performance, design modification is required to improve heat capacity. Modified plate heat exchanger as a condenser will be studied and plate heat exchanger as an evaporator will be executed experimentally under vehicle operating conditions.