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연비 향상을 위한 Automatic Transmission Fluid Warmer 개발 연구
김재연(Jaeyeon Kim),박만희(Manhee Park),최용현(Yonghyun Choi),김대광(Daekwang Kim),전태수(Taesu Chung),박명성(Myungsung Park) 한국자동차공학회 2010 한국자동차공학회 학술대회 및 전시회 Vol.2010 No.11
The purpose of this study is development of Automatic Transmission Fluid warmer for the fuel economy. In this paper, experiments conducted to develop ATF Warmer & Cooler with Same Cooling Performance of Conventional Water Cooled Oil Cooler. Stacked plate heat exchanger applied in ATF Warmer to investigate the heat transfer characteristic and relationship between operating parameter and effect of the fuel economy. The results show that the friction of Automatic transmission fluid decrease in the fast warm up conditions and this effects make 0.7~1.2% of fuel economy improvement.
신뢰성 평가 기반의 자동차용 에어컨 컴프레서 볼 베어링 수명 모형 개발 사례연구
원승현(Seunghyun Won),오동석(Dongseok Oh),박만희(Manhee Park),오성택(Sungtaeg Oh),박부희(Boohee Park) 한국자동차공학회 2020 한국자동차공학회 부문종합 학술대회 Vol.2020 No.7
The air-condition compressor applied to the vehicle is operated by belt assembly(assembly, ass’y) connected to engine crank pulley. The belt tension generated by the engine during driving is applied to the air-condition compressor pulley as a hub load. The hub load applied at this time reduces the life of the compressor pulley bearing, and the model of the bearing design life using this principle is the Palmgren"s model. However, the Palmgren"s model is a bearing life prediction model published in the 1950s, and ISO 281:1977 since 1970s proposed a bearing life model using correction factor, and it was revised a total in 3 times in 1990 and 2007. The proposed bearing life model in ISO standard is first determined by the viscoelasticity(viscosity) of the lubricant, and the life model using the correction factor is determined by the material which is the design factor of the bearing. We found that the relationship between bearing design life and bearing field claim ratio is very low for compressor applied by our company. Therefore, based on reliability life test, the life data is analyzed to derive correction factor and a bearing design life model is developed using the derived correction factor.
차용웅(Yongwoong Cha),변상철(Sangchul Byon),박만희(Manhee Park),김재연(Jaeyeon Kim),고춘식(Choonsik Ko) 한국자동차공학회 2009 한국자동차공학회 학술대회 및 전시회 Vol.2009 No.11
To apply a subcool acceleration air conditioning system in car, a suction line heat exchanger (SLHX) must be a small and simple design. So we developed a double pipe internal heat exchanger (IHX). Using this double pipe IHX, we can improve coefficient of performance in A/C system, and we use this profit to improve a rate of fuel consumption.
최이철(Yicheol Choi),이원석(Wonsuk Lee),박만희(Manhee Park),최용현(Yonghyun Choi) 한국자동차공학회 2011 한국자동차공학회 학술대회 및 전시회 Vol.2011 No.11
The main objective of this work is to investigate the performance characteristics of R134a Heat Pump System for the Battery Electric Vehicle. In this study, the performance characteristics of the Heat Pump System were analyzed for heating, and results for performance were provided for operating conditions when using recovered heat from the ambient above -10 degrees. The experimental work has done with variations of the electric compressor speed, front air velocity of exterior heat exchanger, and the ambient. The heating capacity of the interior heat exchanger was measured up to 5.6 ㎾.
최이철(Yi Cheol Choi),이원석(Wonsuk Lee),권오영(Ohyoung Kwon),박만희(Manhee Park),최용현(Yonghyun Choi) 한국자동차공학회 2012 한국자동차공학회 학술대회 및 전시회 Vol.2012 No.11
The main objective of this work is development of High Efficiency Heatpump System for Battery Electric Vehicle. In this study, the heating capacity and power consumption of the Heatpump System were analyzed on the air source and coolant source. This Experimental work has done with variations of ambient temperatures in the wind tunnel. And results for test shows that coolant source type is lower power consumption than air source type. And, to make high efficiency, coolant heatpump system is applied some items to grab at heat loss. This work get results that power consumption was saving 25% and 45% by base system at each 0℃ and ?20℃ ambient temperature.
안병훈(Byounghoon An),이원석(Wonsuk Lee),이순종(Soonjong Lee),박병덕(Byung-Duck Park),박만희(Manhee Park),최용현(Yonghyun Choi) 한국자동차공학회 2013 한국자동차공학회 학술대회 및 전시회 Vol.2013 No.11
For the prevention of depletion of energy resources and global warming in the world, efficient use of energy is required. By a global movement like this, the most important issue in the automobile field is improved fuel efficiency in recent. In order to improve the fuel efficiency of automobiles, improving performance of air conditioning system is the most important. In this study, it has been the design of the sub-expansion system has enough sub-cooling is obtained in the condenser outlet. In this system, the triple tube heat exchanger and the refrigerant expansion circuit is installed in the condenser outlet for performing heat exchange even more. The experimental results, sub-expansion system confirmed cooling performance to be better than 8% of the existing system.