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공회전 제한장치 차량용 축냉 열교환기의 성능에 대한 연구
이대웅(Daewoong Lee),권대복(Daebok Keon),정석제(Sukjae Chung),정춘식(Chunshik Jeong),왕윤호(Yoonho Wang) 한국자동차공학회 2014 한국자동차공학회 학술대회 및 전시회 Vol.2014 No.11
ISG system for the fuel economy and emission is very useful technology in the recent automobile industrial. However, when engine stop, air-conditioning system don"t work due to compressor stop arise from passenger"s thermally dis-comfort. This study represented the cold storage system applied cold storage heat-exchanger integrated with evaporator. The experiments were conducted for optimum cold storage heat-exchanger design with different refrigerant flow pass, fin height and density, phase change materials in the heatexchanger. Also the cold storage release performance are examined effect on the ambient temperature and supplying air flow volume rate. The visualization of phase change material freezing and melting process inside cold storage heat-exchanger are conducted. The experimental results, air discharge temperature of cold storage system applied optimum cold storage heat-exchanger is 116 second delay to reach the 18°C set on the cabin comfort temperature range than current air-conditioning system. Finally, cold storage heat-exchanger integrated with evaporator is effective solution for ISG vehicles, to keep the thermal comfort in the cabin when short period of engine stop.
공조장치 연계형 시트공조 시스템의 냉난방 성능에 대한 실험적 연구
이대웅(Daewoong Lee),박태용(Taeyong Park),정석제(Sukjae Chung),정춘식(Chunshik Jeong),왕윤호(Yoonho Wang) 한국자동차공학회 2015 한국자동차공학회 부문종합 학술대회 Vol.2015 No.5
The aim of this paper is to investigate the application of low cost CCS(Climate Control Seat) using a HVAC(Heating, Ventilation and Air-Conditioning) system. CCSs is being vigorously purposed because requests for passenger`s thermal comfort are increasing. However current CCS, which is thermoelectric device have been applied for both heating and cooling, used limited luxurious car only. HVAC type CCSs are well suited for effective delivery of conditioned air due to thermal comfort and close proximity to the occupants. Experimental results show that the HVAC type CCCs have superior cooling performance and slightly uncompetitive heating performance than that of TED type CCS. In the case of HVAC type CCSs, air flow volume was increased approximately 3.7~7.3㎥/h than TED type CCS. and surface temperature of seat was reduced about 5℃ and cool-down was similar than Base. Additionally, occupants subjective evaluation, HVAC type CCSs was reduced 8 minutes to reach the comfort rating 5 at cooling test and high comporting ration after 8 minutes at seat heating test than of TED type CCSs.
자동차용 멀티 에어컨 시스템의 성능에 관한 실험적 연구
맹찬주(Chanjoo Maeng),엄세동(Saedong Eom),이대웅(Daewoong Lee),정석제(Sukjae Chung) 한국자동차공학회 2015 한국자동차공학회 부문종합 학술대회 Vol.2015 No.5
After the dramatic development of automobile driving performance, people have a interest in the environment, fuel efficiency and passengers convenience. The automotive air-conditioning system is being developed to ensure the comfort of passenger regardless to changes in the external environment such as weather, climate. In the case of vehicles for many people transport, it is possible to control the cabin room environment using a multi-air conditioner. Mismatching system components to thermal expansion valve may degrade the system performance and stability. To meet the cooling demand for each evaporator, the thermal expansion valve may be controlled. The experimental results showed that values of each thermal expansion valve may affect the cooling capacity and stability.
집중 및 확산형 에어 벤트가 자동차 실내 열적 쾌적성에 미치는 영향에 대한 연구
안준철(Junchul An),정재원(Jaewoon Jeong),백창현(Changhyun Baek),정홍희(Honghee Jeong),이대웅(Daewoong Lee),정석제(Sukjae Chung) 한국자동차공학회 2014 한국자동차공학회 학술대회 및 전시회 Vol.2014 No.11
As automotive industry has enlarged and lifestyle has been changed, spending time in an automotive has been gradually increasing. Accordingly, thermal comfort that passengers feel inside the cabin of an automotive is more important than before. The thermal comfort can be affected from several factors, like temperature and humidity inside cabin and amount of solar radiation. The aim of this paper is to investigate the impact on thermal comfort in an automotive for changing the pattern of discharge air from HVAC. The changed patterns of discharge air were considered three types, focused-type, diffuse-type, focused and diffuse-type. Those types of discharge air can be formed by adding a structure of air vent in the ducts and HVAC. Cool-down performance and thermal comfort test based on subjective comfort rate of passengers were performed to evaluate thermal comfort. As a result, focused-type, focused and diffuse-type discharge air can be helpful for improving thermal comfort of passengers and air stream of cabin.