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공랭식 인터쿨러 성능에 영향을 미치는 인자들에 대한 실험적 연구
오광헌(Kwang-hun Oh),정순안(Sun-an Jeong),전태수(Tae-soo Chun) 한국자동차공학회 2019 한국자동차공학회 부문종합 학술대회 Vol.2019 No.5
To increase the power and torque of the vehicle engine, mount the turbocharger using the exhaust gas discharge pressure. In this system, the air cooled type charge air cooler(ACAC) is required to efficiently cool temperature rise in the process of compressing outside air. In this study, the performance factors of the air cooled type charge air cooler(ACAC) were analysed experimentally. And depending on the vehicle mounting position, SBS and Brick types were selected for the test. Our study analyzed the effects of factors affecting performance, such as offset rate and fin bonding ratio. The heat rejection and cooling air pressure drop by offset ratio and fin bonding ratio respectively did not affect up to 90%. However, the design should be considered as it affects the durability aspects of the fin bonding factor. In addition, heat rejection by offset ratio depends on the sample specification, but there is a possibility that 30-50% is appropriate.
Radiator 입출구 위치가 방열성능에 미치는 영향분석
최문석(Moonseok Choi),정순안(Sunan Jeong),정성우(Seongwoo Jeong),전길웅(Gil Woong Jun) 한국자동차공학회 2009 한국자동차공학회 학술대회 및 전시회 Vol.2009 No.11
The radiators are used for cooling the internal combustion engine of automobiles. And the radiators operate by passing a liquid coolant through the engine block, where it is heated, then through the radiator itself where it loses heat to the atmosphere. The conventional radiators have at least two spigots for coolant circulation. The inlet spigot location is recommended at the very highest point of radiator and outlet spigot at the very lowest point of it. Two spigots are located diagonally. In this study, the prototype radiator, which has 3 inlet and 3 outlet spigots, was manufactured for verifying the heat performance effect by testing. As the test result, the maximum heat rejection variation is 1.4%. This value variation can be considered as it is acceptable experimental error range. Therefore, this study shows the inlet and outlet spigot position is not effect on radiator heat performance.
차량용 오일쿨러 내측 핀과 플레이트 구조 최적 설계에 관한 연구
조병선(Byoungsun Cho),정순안(Sunan Jeong),박창호(Changho Park) 한국자동차공학회 2009 한국자동차공학회 학술대회 및 전시회 Vol.2009 No.11
Auto transmission in vehicle need heat exchanger for cooling transmission working oil. In this study, find the test method and condition of prediction heat dissipation in transmission cooling system appling two heat exchangers and develop new high performance oilcooler that can satisfy one heat exchanger for cooling transmission oil system that use currently with two exchangers.
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.
김학세(Hakse Kim),주광진(KwangJin Joo),정순안(Sunan Jeong),민은기(Eunki Min) 한국자동차공학회 2007 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Assembling Air conditioner condenser and auto transmission 'oil cooler separately into cooling module has disadvantage of cost, weight and performance, In addition, it has package problem because of complex engine room layout. The integrated heat exchanger which unifies condenser and oil cooler was developed to improve cost, weight and package layout with keeping the performance as before. Bench and vehicle condition test was performed to find the optimized specification. The test result shows that the integrated heat exchanger can reduce weight by 10% with similar performance compared to previous separate system and get more compact cooling module.
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℃.