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RISS 인기검색어
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- 저자 : 오광헌(Kwanghun Oh) (검색결과 5 건)
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축냉 증발기 적용을 통한 ISG Mode 시 냉방성능 유지 효과에 대한 실험적 연구
전영하(Youngha Jeon),오광헌(Kwanghun Oh),왕윤호(Yoonho Wang) 한국자동차공학회 2012 한국자동차공학회 지부 학술대회 논문집 Vol.2012 No.10
Recently regulations regarding CO2 emission and fuel economy of automobile are being released. To cope with the regulations, ISG (Idle-Stop and Go) mode is being widely applied to conventional and hybrid car with decreasing compressor driving time. In this paper, effect of cold storage system which can maintain cooling performance and thermal comfort during ISG mode is dealt. The system consists of evaporator including cold storage material inside and other parts which are used in conventional air-conditioning system, and other additional part was not used. This paper presents experimental results of cooling performance during ISG mode and test was conducted in system bench stand. Evaporators with different size and several cold storage materials were compared. As a result, cold storage evaporator could maintain thermal comfort during about 40 seconds longer than conventional system. It is identified that cold storage evaporator can be used also in high speed condition to improve fuel economy through compressor on/off control.
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차량 난방 성능 향상을 위한 하이브리드 PTC 히터 적용에 관한 연구
구중삼(Jungsam Gu),오광헌(Kwanghun Oh),정순안(Sunan Jeong),왕윤호(Yoonho Wang) 한국자동차공학회 2013 한국자동차공학회 부문종합 학술대회 Vol.2013 No.5
Recently internal combustion engine’s efficiency has been improved dramatically from customer’s demand that is to get car of good fuel efficiency. But air conditioning side is necessarily lacking the heat source for heating cabin room due to the decreased waste heat from engine. For this reason, PTC heater has used as auxiliary heater. PTC heater was being applied to diesel engine to improve early thermal comfort in cold start and the application is being expanded into gasoline engine as well. In conventional PTC heater, HVAC package size increases due to separated structure from coolant heater. Also temperature distribution and heating performance decrease because PTC heater cannot cover overall effective area. So there is a demand of new technology which can improve heating performance. In this paper, the hybrid PTC heater’s heating performance is validated. The hybrid PTC heater consists of conventional coolant heater and new PTC heater with thin profile. In the structure, two heaters are integrated into one assembly with no gap. The hybrid PTC heater can compensate waste heat loss and improve HVAC package size.
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ISG Mode 시 축냉 시스템의 냉방 효과에 대한 실험적 연구
전영하(Youngha Jeon),오광헌(Kwanghun Oh),정순안(Sunan Jeong),왕윤호(Yoonho Wang) 한국자동차공학회 2013 한국자동차공학회 부문종합 학술대회 Vol.2013 No.5
Recently regulations regarding CO2 emission and fuel economy of automobile are being released. To reduce fuel consumption through decreasing compressor driving time, ISG (Idle-Stop and Go) mode is being widely applied to internal combustion engine and hybrid vehicle. In this paper, cooling effect of cold storage system which can provide thermal comfort during ISG mode is validated. The cold storage system consists of the evaporator including cold storage material inside and other parts which are being used in conventional air-conditioning system. In this system, other additional part is not needed for cold storage function. This paper presents experimental results of cooling performance during ISG mode and the vehicle test was conducted both in climate wind tunnel and on road. From previous research, it can be assumed that the outlet air temperature below 15℃ is in the thermal comfort range.6), 7) In climate wind tunnel test, cold storage system could keep thermal comfort during 221~255 seconds which is longer than conventional system by 35~46%. In urban traffic test, which average stop time in accordance with traffic signal was 66.3 seconds, cold storage system could cover 89% stops without compressor restart keeping thermal comfort. Whereas conventional system should restart compressor in 56% stop to keep outlet air temperature below 15℃.
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김명회(Myunghoe Kim),구중삼,오광헌(Kwanghun Oh),장병무(Byeongmoo Jang),배종식(Jongsik Bae),Junmo Ku 한국자동차공학회 2015 한국자동차공학회 부문종합 학술대회 Vol.2015 No.5
Recently Car-maker has improved efficiency of engine because customers prefer car with increased fuel efficiency For this reason, PTC heater has been applied with diesel engine since past 10 year for heating performance. Furthermore heat source continually reduced in Gasoline engine because of improvement of gasoline engine efficiency. So PTC heater is also applied to Gasoline engine. Recently trend is to increase using of PTC heater. Like this PTC heater of auxiliary heater has been transformed into the main heater. But PTC heater has increasing HVAC package. Also, PTC heater has increasing temperature distribution and decreasing heating performance because cold air is bypassed. This paper is about studying hybrid PTC heater that is improved about disadvantages of PTC heater. Hybrid PTC heater is composed of an efficiently combination of thin PTC heater with coolant heater core. This paper presents experimental results of heating performance test at vehicle level. As a result, Hybrid PTC heater could improve interior temperature of vehicle about 0.9℃~3℃
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루버 핀 열교환기를 가지는 자동차용 히트펌프 시스템의 착상 특성 연구
임홍영(Hong Young Lim),송준영(Junyoung Song),신성홍(Sunghong Shin),김학규(Hakkyu Kim),오광헌(Kwanghun Oh),최영돈(Youngdon Choi) 한국자동차공학회 2013 한국자동차공학회 부문종합 학술대회 Vol.2013 No.5
The present study investigated the heating performance and frosting phenomenon of the heat pump system for vehicle, which is being developed to increase fuel efficiency of EV(Electric Vehicle) with maintaining thermal comfort. The experimental setup of a heat pump system consists of an electric compressor, an exterior louvered fin-flat tube condenser, an interior condenser, and an evaporator, block type thermal expansion valve and reservoir tank, which are used in actual HVAC system for vehicle. In this study, frosting phenomenon patterns of outside condenser having uniform air flow rate was visualized and heat pump performance is examined experimentally. In addition, the frosting phenomenon is compared with different compressor rpm. As results, non-uniform frosting phenomenon and non-frosting area in exterior condenser was occurred. The heating performance based on air side of interior condenser outlet was maximized within 4min. The heating performance was reduced 5.3% after 27min and 42% after 90min because of frosting in exterior condenser.
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