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연료전지 스택 배열을 활용한 CO₂ 난방 시스템 성능 특성에 관한 실험적 연구
이호성(Hoseong Lee),원종필(Jongphil Won),조중원(Choongwon Cho),이무연(Mooyeon Lee),정영철(Youngchul Jung),모지환(Jihwan Mo),김용찬(Yongchan Kim) 한국자동차공학회 2011 한국자동차공학회 부문종합 학술대회 Vol.2011 No.5
The aim of this study is to investigate the performance characteristics of CO₂ Heat Pump(H/P) system with stack coolant heat source for fuel cell electric vehicles(FCEV) under various operating conditions. The present heating system for FCEV uses PTC heater, which results in lower fuel efficiency and reduction of driving range. To improve heating capacity without additional power consumption, one of possible methods is to use stack coolant wasted-heat for FCEV. Due to high pressure and temperature operating condition for CO₂, CO₂ heat pump has been concerned that it seems to cover heating capacity with the similar capacity of engine coolant heating system. Furthermore, CO₂ heating system is free of environmental regulations for a vehicle refrigerant. In this study, experiments to analyze heating performance characteristics with stack coolant heat source have been done with various operating conditions, which are likely to match the electric H/P system operating conditions under cold ambient conditions, such as variation of compressor speed and interior air temperature. Experimental results show that stack coolant temperature needs more than 50℃ to have required heating capacity 6.0 ㎾ @ interior air inlet temperature, -20℃ under the rated electric compressor speed 4,000 rpm. From various experimental results, operating conditions to have optimum heating performance with stack coolant heat recovery under various interior air condition, such as the stack coolant temperature and the compressor speed, were found.
CO₂ 에어컨 시스템 실차 운전조건 변화에 관한 성능 특성 연구
이호성(Hoseong Lee),원종필(Jongphil Won),조중원(Choongwon Cho),이무연(Mooyeon Lee),정영철(Youngchul Jung),전한별(Hanbyeol Jeon),김용찬(Yongchan Kim) 한국자동차공학회 2011 한국자동차공학회 부문종합 학술대회 Vol.2011 No.5
This paper investigated the performance characteristics of a CO₂ air conditioning system for vehicles. The modified air conditioning system using CO₂ as a working fluid has been developed to apply as one of possible alternatives for mobile A/C system refrigerant. In this study, experiments to analyze cooling performance characteristics have been done with various operating conditions, which are likely to match the actual vehicle’s driving conditions under hot ambient conditions, such as variation of gas-cooler inlet air temperature, evaporator inlet air conditions and compressor speed. Experimental results show that cooling capacity and coefficient of performance(COP) were up to 5.5 ㎾ and 2.7, respectively. Therefore, tested CO₂ A/C system has sufficient cooling performance to cope with cooling load under various actual driving conditions. Furthermore, road tests to apply the developed CO₂ A/C system will be investigated and correlation between bench tests and real road tests will be analyzed after comparing two cases.
GM Volt 실도로 운행 조건에서의 냉난방 시스템 제어 특성 연구
이호성(Hoseong Lee),원종필(Jongphil Won),조중원(Choongwon Cho),이무연(Mooyeon Lee),박용선(Yongsun Park),김성균(Sungkyun Kim),김용찬(Yongchan Kim) 한국자동차공학회 2012 한국자동차공학회 부문종합 학술대회 Vol.2012 No.5
Experiments of electrical air conditioning system for GM Volt(PHEV, Plug-in Hybrid Electric Vehicle) has been performed with the variation of operating conditions. To control temperature in the cabin, GM Volt applying electric drive system has electrical air conditioning system, such as the electric-driven compressor and coolant heating PTC heater. In this study, the electrical air conditioning system layout of GM Volt was founded and temperature control logic in the cabin was partially analyzed from fuel economy test and city driving test modes. When the cabin cooled down, the supply of electric power to the electric-driven compressor seemed to be controled at the interior temperature level of 8℃ during CS(Charge sustaining) mode, which engine operated after the deletion of charging. When the cabin warmed warm under subzero ambient condition, high voltage PTC heater was mainly used at CD(Charge depleting) mode and engine operated intermittently to heat up coolant. Consequently, battery charging depletion got rapid that fuel economy got worse. Even though heating mode was not operated under freezing weather condition, engine operation seemed to be controlled by coolant inlet temperature to PTC heater at the level of 40℃. Further researches for cool-down performance on the road will be studied.
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.