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조중원(Choong-Won Cho),원종필(Jongphil Won),이호성(Hoseong Lee),이동혁(Donghyuk Lee),오태성(Tae Sung Oh),박용선(Yong Sun Park) 한국자동차공학회 2009 한국자동차공학회 학술대회 및 전시회 Vol.2009 No.11
Ethylene glycol is generally mixed with water as antifreezing solution in a thermal management system for a fuel cell vehicle, but there are significant differences between ethylene glycol and water. For example, ethylene glycol has much higher viscosity than that of water. These differences in physical property lead to reduction in heat transfer rate of the thermal management system. this study describes the characteristics of heat transfer in a stack and a radiator respectively, because flows in the stack is laminar. Empirical correlation is used to calculate physical properties of antifreezing coolant. In this study, we show that use of the antifreezing solution causes increase in temperature difference between coolant input and coolant output of the stack. this temperature rise effects the performance of the fuel cell stack.
상용차용 로타리 전동압축기 적용 하이브리드 냉방시스템 성능 특성 연구
이호성(Hoseong Lee),원종필(Jongphil Won),조중원(Choongwon Cho),임택규(Taekkyu Lim),전한별(Hanbyoel Jeon),한만승(Manseung Han),김정일(Jungil Kim),김용찬(Yongchan Kim) 한국자동차공학회 2017 한국자동차공학회 부문종합 학술대회 Vol.2017 No.5
The objective of this study was to investigate performance characteristics of hybrid cooling system with rotary type electric controlled compressor in a commercial vehicle. Tested hybrid cooling system had additionally the electric compressor besides present mechanical compressor to use selectively according to operating conditions. Applied electric compressor is rotary type and has 20.8 cc displacement. In order to analyze performance characteristics of hybrid cooling system with respect to cooling capacity and COP(Coefficient of Performance), other components including two different types of compressors were installed and tested under various operating conditions such as compressor speed and air flow rate of the evaporator. When the mechanical compressor was operated, while cooling capacity was higher than the electric controlled compressor, COP was lower due to larger displacement and higher power consumption. Therefore, to decrease cabin temperature quickly, mechanical compressor is operated at first and then to maintain under the required temperature, electric controlled compressor might be operated. Consequently, fuel consumption will be reduced because of efficient operation to control heat load of the cabin.
EV 상용차용 히트펌프 시스템 냉방 성능 특성에 관한 연구
전한별(Hanbyeol Jeon),원종필(Jongphil Won),조중원(Choongwon Cho),임택규(Taekkyu Lim),한만승(Manseung Han),김종인(Jongin Kim),이호성(Hoseong Lee) 한국자동차공학회 2019 한국자동차공학회 부문종합 학술대회 Vol.2019 No.5
The cooling performance evaluation of heat pump system for light-duty commercial electric vehicle was studied experimentally. In order to identify the cooling performance characteristics of the heat pump for light-duty commercial electric vehicles, it was evaluated by varying the temperature, flow rate of chiller coolant, and electric compressor speed, under the exterior air temperature of 35°C and interior air temperature of 25°C. Increasing the compressor speeds shows the cooling capacity of the system increases by 7.5% on average, and the compressor work by 27% on average. As a result, the system COP(coefficient of performance) decreases by 14.5% on average. Increasing the temperature of chiller coolant shows the cooling capacity of the system increases by 0.07 kW on average, and the compressor work by the compressor increases by 0.15 kW on average. As a result, the system COP decreases by 8.7% on average. Increasing the flow rate of chiller coolant show the cooling capacity of the system increases by 0.03% on average, and the compressor work by the compressor increases by 0.04% on average. As a result, the system COP does not change.
오벌형 자동차 촉매 컨버터의 고온 열적 거동 예측에 관한 연구
허형석(Hyungseok Heo),원종필(Jongphil Won),이규현(Kyuhyun Lee) 한국자동차공학회 2002 한국 자동차공학회논문집 Vol.10 No.5
Considering the high temperature durability, the most important issue is to accurately predict the maximum operating temperature of the shell, mat and substrate. This temperature prediction then defines the material selections for the mat, shell and cones, and allows an assessment to be made as to the necessity of heat shielding. In this papers, The commercial code FLUENT was utilized to simulate automotive oval type catalytic converters, with the objective of predicting thermal behavior under steady-state, high-load conditions. Specialized computational models are used to account for eftects of heat and mass transfer in the monolith, conjugate heat transfer in the various converter materials, and radiation heat transfer.<br/>
Spiral 구조 EGR Cooler의 열유동 특성 평가
허형석(Hyungseok Heo),원종필(Jongphil Won),박경석(Kyoungsuk Park) 한국자동차공학회 2003 한국 자동차공학회논문집 Vol.11 No.6
Cooled EGR is an effective method for the reduction of NOx from a diesel engine and an EGR Cooler is the key component of the system. High efficiency, low pressure loss and compactness are required for the EGR Cooler. To meet these requirements, new geometric tube must be developed. In this paper, a full size EGR cooler test bench has been developed to validate the CFD flow and heat transfer models. Fluid temperature and pressure drop measurements are provided. Inlet temperature is 200℃ and 300℃, and flow rates vary from 0.008 ㎏/sec to 0.019 ㎏/sec. The gas flow and heat transfer in a single tube cooler have been studied using computational fluid dynamics(CFD). Analysis has been carried out in a single tube with a plain tube and six spirally enhanced tubes of varying pitch to depth ratio(p/e).<br/>
연료전지 스택 폐열 활용 전동식 난방시스템 성능 특성 연구
이호성(Hoseong Lee),원종필(Jongphil Won),조중원(Choongwon Cho),신은성(Eunsung Shin),김지민(Jimin Kim),이대용(Daeyong Lee),조규창(Kyuchang Cho),김용찬(Yongchan Kim) 한국자동차공학회 2017 한국자동차공학회 부문종합 학술대회 Vol.2017 No.5
The objective of this study was to investigate heating performance characteristics of stack coolant heat-sourced electric driven air conditioning system in a fuel cell electric vehicle(FCEV). In order to analyze heating performance characteristics of electric driven air conditioning system with plate type heat exchanger between stack coolant and a refrigerant, R-134a, each component in the heat pump system was installed and tested under various operating conditions, such as air inlet temperature of inner condenser and compressor speed. Heating performance of tested system was thought to be heating capacity and COP(Coefficient of Performance) after various experiments according to FCEV driving conditions. Because tested system had EEV(Electric Expansion Valve) to control the refrigerant mass flow rate, heating performance was analyzed along with EEV opening. When the air inlet temperature of inner condenser was varied from 0.0℃to –20.0℃, heating capacity was found to be similar due to somewhat equal temperature difference between inlet and outlet of inner condenser. However, COP increased until certain EEV opening, especially under 45.0%, because of decreasing power consumption. When the compressor speed was varied from 2,000 to 4,000 RPM, while heating capacity increased, COP decreased by higher refrigerant mass flow rate. In the future works, additional performance characteristics would be analyzed according to stack coolant operating conditions.