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자동차용 R134a 수열원 히트펌프 시스템에 관한 실험적 연구
이대웅(Daewoong Lee),오동훈(Donghoon Oh),지용준(Yongjun Jee) 한국자동차공학회 2012 한국자동차공학회 학술대회 및 전시회 Vol.2012 No.11
This study presented the feasibility of coolant heat source heat pump system as an alternative heating system on the electrically driven vehicles. Heat pumps are among the most environmentally friendly and efficient heating technologies available. In various countries, the electric mobiles like EV, PHEV, and FCEV, have been mainly concerned with heat pump with for new mobile markets. The experiments were conducted with various ambient temperature and coolant temperature as winter season. The system, coolant heat source heat pump, was consist of an inside heat exchanger, an outside heat exchanger, a motor driven compressor, an electronic expansion valve, and plumbing parts. Maximum, heating capacity and air discharge temperature are up to 6.3 kW and 62℃ respectively at ambient 10 ℃, coolant 10 ℃ conditions. However -20 ℃ ambient and -10 ℃ coolant temperature conditions are insufficiency to warm the cabin as 13 ℃ air discharge temperature.
무공해자동차용 R134a 히트펌프 시스템의 성능에 미치는 영향에 대한 실험적 연구
이대웅(Daewoong Lee),오동훈(Donghoon Oh),지용준(Yongjun Jee) 한국자동차공학회 2012 한국자동차공학회 부문종합 학술대회 Vol.2012 No.5
This paper deals with the experimental study for the heating performance that could be used for R-134a automobile heat pump systems. Heat pump system is widely studying for zero emission vehicle"s heating system due to small power consumption and effectively heating in the cabin. This paper presents experimental results of the influence of the heating capacity and coefficient of performance. The test was performed with different size of inside heat exchangers and outside heat exchangers, also refrigerant flow rate was considered in two way of flow devices. And heat source, means air heat source and water heat source with heat pump system was examined. The experimental results with heat pump system is to analyze the impact on performance. The best combination of performance is A-inside heat exchanger, B-outside heat exchanger, and B-flow device respectively. And water heat source is roughly 40% better performance than air heat source heat pump system.
HEV 동력계 및 배터리계 냉각 시스템용 BLDC모터 개발
권대복(Daebok Kwon),이대웅(Daewoong Lee),지용준(Yongjun Jee),박창호(Changho Park) 한국자동차공학회 2008 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Hybrid Electric Vehicle seriously comes into recent car manufacturers related environmental and economic concerns of conventional vehicle. For the alternative power-train and battery cooling system in HEV's, effective thermal management system is needed and many automakers interested in BLOC motor of cooling fans to the overall traction unit's performance. This paper presents the development status of BLOC motor as major parts of power-train and battery cooling fan for HEV. BLOC motor for power-train and battery cooling fan each, is successful designed by using electro-magnetic analysis and prototype BLDC motors are tested. As experimental results, finally efficiency of BLDC motor achieved 85% for power-train cooling fan and 72% for battery cooling fan. The electric cogging noise is significantly reduced by changing skews pitch angle and optimized magnetic shape. These results are satisfied to 1st stage design criteria. Next step, BLDC motors will be development over 90% efficiency with built-in controller.
무공해자동차용 R134a 히트펌프 시스템 적용 검토에 관한 연구
이대웅(Daewoong Lee),오동훈(Donghoon Oh),지용준(Yongjun Jee) 한국자동차공학회 2011 한국자동차공학회 학술대회 및 전시회 Vol.2011 No.11
The aim of this paper is to investigate the possibility of R-134a heat pump system with conventional air-conditioning system for zero emission vehicles. Heat pump system is one of the solution to heat the air in the cabin and defrost the wind shield using a small power consumption. The system components was consist of inside heat exchanger, outside heat exchanger, electrically driven compressor, electric expansion valve, and refrigerant flow change valve. Cooling capacity was examined by means of vehicle driving conditions and compressor rotational speed. Also heating performance for heat pump system are investigated with different ambient temperature and compressor rotational speed. The experimental results using heat pump system could provide thermally comfort in cabin with small energy consumption than electrically direct heating system. Heating capacity and air discharge temperature are up to 4.89㎾ and 41.7℃ respectively at ambient 0℃ and 7000rpm of compressor rotational speed. And power consumption of the heat pump system is about 1/3 than electric heating system at same heating capacity.
박성호(Sungho Park),장길상(Kilsang Jang),이준호(Joonho Lee),오광철(Kwangchul Oh),고성석(Sungsuk Ko),최재권(Jaekwon Choi),지용준(Yongjun Jee) 한국자동차공학회 2012 한국자동차공학회 부문종합 학술대회 Vol.2012 No.5
Improving the performance and the fuel economy of an engine, the reduction of engine size is considered by using a turbocharger or supercharger. But the turbocharged engines have worse transient response than the naturally aspirated engines because it takes a few seconds to get the turbocharger rotate up to high speed. So many technologies are developed to improve turbocharger response: VGT, Twin turbocharger, water-cooled intercooler, and so on. And there are many researches to analyze turbocharger transient phenomenon: optimizing the size of a turbocharger, flow capacity, efficiency, and moment of inertia. This research deals with the transient response of a diesel engine with variable geometry turbocharger and water-cooled intercooler. And it’s focused on intercooler size, WCAC pipe length, and cooling water temperature of the water-cooled intercooler.