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김용철(Yongchul Kim),성낙섭(Naksup Sung),박동규(Dongkyou Park),조후택(Hootaek Cho) 한국자동차공학회 2010 한국자동차공학회 부문종합 학술대회 Vol.2010 No.5
Recently, the quick heating performance is the big issue in the vehicle because engine performance is high. So car makers adapted the additional heating devices (ex. PTC heater). As quick cabin cooling performance is recorded in the IQS, it is an important issue, too. In this study, the HVAC intake door control is studied for quick heating and cooling performance. In case of the heating performance, it improves 4.0℃ at -20℃ ambient after 20 minutes. And in case of cooling performance, it improves 1.5℃ at 35℃ ambient after 10 minutes. In addition, intake door control system brings on the cost reduction about 200 won because the flab door is eliminated. In present, intake door control system is adapted all HKMC new developing car.
지구 온난화 방지를 위한 자동차 용 대체 냉매 에어컨 시스템
유진영(Jinyoung Yoo),Scott Bang,Fortier Ryan,배유진(Yujin Bae),성낙섭(Naksup Sung) 한국자동차공학회 2009 한국자동차공학회 부문종합 학술대회 Vol.2009 No.4
EU Directive 2006/40/EC prohibits use of refrigerants with global warming potential greater than 150 in Mobile Air Condition(MAC) starting 2011. This paper presents an experimental study of various alternative refrigerant MAC systems to identify a possible replacement for current R-134a. Of many proposed refrigerants, HFO-1234yf is overall more environmental friendly than R-744 to replace R-134a, based on a number of performance evaluation and risk assessments. Because HFO-1234yf is a mildly flammable, a number of different risk assessments were completed in order to evaluate its risk in vehicle usage. Many evaluations concluded that only oil ignites even at unrealistic high temperature & pure HFO-1234yf failed to ignite without oil.