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주원석(Wonseok Joo),권대복(Daebok Kwon),조경석(Kyungseok Cho),박창호(Changho Park) 한국자동차공학회 2011 한국자동차공학회 부문종합 학술대회 Vol.2011 No.5
Fuel Cell Stack generates enormous heats in the electrochemical process. Generally, the fuel cell stack operates well at a temperature around 65℃ which is lower than the internal combustion engine in the PEMFC vehicle. By using the engine cooling simulation program, we found that the minimum heat capacity of the stack cooling module and air-flow of the fan. The minimum airflow would be 7000 CMH for the 35㎾ of the heat from the stack. We had developed high voltage BLDC motor with controller and high efficiency heat exchanger to solve the problem. But, the Noise of stack cooling fan is very higher than that of ICE vehicle. so, it is necessary to reduce the noise of fan for application to vehicle. This study will present the improvement process of the Stack Radiator which increases the heat capacity and reduces the noise of cooling fan. In the first stage of development we conduct computer simulation including structure analysis. We made the prototype of the cooling module through the results of simulation. Then the performance test was conducted. The results of calorimeter test show that the developed cooling module meets the severe requirements reducing the noise of the cooling fan.
냉각 팬 패키지 축소에 따른 엔진 냉각 성능 영향에 대한 연구
윤신원(Shinwon, Yun),이상현(Sanghyun, Lee),전성오(Seongoh, Jeon),김혁(Hyuk, Kim) 한국자동차공학회 2015 한국자동차공학회 학술대회 및 전시회 Vol.2015 No.11
The request(RCAR-Research Council for Automobile Repairs)to minimize the cost of repair at low speed car crash of vehicle is growing. To do this, various studies have be done. And the thickness reduction of cooling module which is located in front of the vehicle have been reviewed. In this study, the effect of vehicle engine cooling performance for the thickness reduction of cooling fan assembly was reviewed.
김철민(Chulmin Kim),이원석(Wonsuk Lee),남강우(Kangwoo Nam),최이철(Yichul Choi),김재연(Jaeyeon Kim),김치명(Chimyung Kim) 한국자동차공학회 2011 한국자동차공학회 학술대회 및 전시회 Vol.2011 No.11
Recently, FCEV has been well known for the low emission and environment-friendly vehicle to the automotive industry. There are many differences between FCEV(Fuel Cell Electric Vehicle) and ICEV(Internal Combustion Engine Vehicle). Especially, one of the main differences is cooling system. ICEV is to cool the engine system but FCEV is to cool the stack. For this reason, FCEV cooling system has to complement low outlet temperature of stack and much mass flow rate. On this paper, we have studied the high performance fan motor assembly with integrated controller of stack cooling system for FCEV and evaluated its performance and reliability under the certain test condition. In addition, in an effort to enhance the safety, we add self-diagnosis function to the inverter controller of fan motor. As a result, we have got satisfactory test result and the high performance fan motor assembly with integrated controller is applicable to the stack cooling module for FCEV.
김성현(Sunghyun Kim),김동석(Dongseok Kim),방용식(Yongsik Bang),김형일(Hyungil Kim) 한국자동차공학회 2009 한국자동차공학회 학술대회 및 전시회 Vol.2009 No.11
The insurance rating has been differentiated in grades according to cost of repair for damaged vehicles and has been an important consideration point for customers when buying a new vehicle. The RCAR (Research Council for Automobile Repairs) has evaluated low speed damageability and reparability of cars. Vehicle manufacturers have tried to reduce the repair cost by designing vehicles with the intent to minimize damage sustained in low speed crash. Repair costs can be reduced by repairable component. Repairable components prevent serious damage of the expensive component such as CRFM and repair the component instead of replacing This paper demonstrates an idea for a repairable CRFM component design to achieve a reduction in repair cost and improve damageability.
Engine cooling airflow의 공기 저항에 관한 수치적 연구
송봉하(Bongha Song),이규익(Kyuik Lee),하종백(Jonpaek Ha) 한국자동차공학회 2011 한국자동차공학회 부문종합 학술대회 Vol.2011 No.5
These days, the fuel economy of road vehicles is getting important all over the world due to the several reasons such as the depletion of fossil fuel, high fuel cost, and stringent regulation of toxic exhaust gas from conventional internal engine combustion. Therefore, all auto makers are requested to develop a vehicle with high fuel efficiency as a demand of times. In this view point, aerodynamics can contribute considerably to solve these demands from customers. Total drag of road vehicle is mainly composed of three parts, exterior skin effect from upper body, underbody effect, and cooling drag. Especially, drag increment from engine cooling airflow need to be minimized for better aerodynamic and powertrain cooling performances through the optimization of front-end styling. Aerodynamics friendly front-end styling is completed by the grille inlet opening and CRFM sealing which are represented by baffle and gap seal. In this research, the drag impact on cooling airflow is studied using CFD analysis. The analysis results showed that grille inlet opening can be closed by reducing the cooling air leakage from grille inlet airflow to heat exchanger. Finally, the closing of non-effective opening are through the optimization of CRFM sealing using baffle and gap seal gave us dramatic aerodynamic saving effect, and therefore it helps the fuel economy.
냉각 공기 유동 최적화를 통한 공력 성능 향상에 관한 수치적 연구
송봉하(Bongha Song),이규익(Kyuik Lee),하종백(Jongpaek Ha) 한국자동차공학회 2011 한국자동차공학회 학술대회 및 전시회 Vol.2011 No.11
These days, the fuel economy of road vehicles is getting important all over the world due to the several reasons such as the depletion of fossil fuel, high fuel cost, and stringent regulation of toxic exhaust gas from conventional internal engine combustion. Therefore, all auto makers have been requested to develop a vehicle with high fuel efficiency as a demand of times. In this view point, aerodynamics is well known as a big potential which can contribute considerably to solve these demands from customers. Total drag of road vehicle is mainly composed of three parts, exterior skin effect from upper body, underbody effect, and engine room’s flow recirculation effect driven by engine cooling air flow. Especially, drag increment from engine cooling air flow needs to be minimized for better aerodynamic performance through the optimization of front-end styling. However, P/T cooling performance has also to be considered carefully because there is a trade-off relationship between aerodynamics and engine cooling performance. In this research, the drag impact on cooling air flow was studied using CFD analysis. Aerodynamics friendly cooling air flow system is completed by the optimization of front grille inlet opening, cooling air outlet, and CRFM sealing, which is represented by baffle and gap seal. The analysis results showed that grille inlet opening could be closed by reducing the leakage of cooling air flow from grille inlet to heat exchanger. Finally, the closing of noneffective grille inlet opening driven by the optimization of CRFM sealing using baffle and gap seal gave us dramatic aerodynamic saving effect, and therefore it will help the fuel economy. The size of cooling air outlet also showed that the bigger the size, the better the aerodynamic performance.