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전기자동차용 배터리의 수명 예측을 위한 열전달 모델 개발
정융(Yoong Jung),김귀택(Gwitaek Kim),김선진(Sunjin Kim),김민수(Min Soo Kim) 대한기계학회 2017 대한기계학회 춘추학술대회 Vol.2017 No.11
Temperature of lithium-ion battery has a huge impact on battery life and performance. Thus, it is important to properly manage the battery cooling system to maintain target battery temperature. In this paper, a numerical model for battery pack and its cooling system for battery electric vehicle(BEV) is developed. In this model, battery stack of 50 kWh capacity is cooled by coolant flow through the fin-assisted cooling plate. The model calculate the temperature change of battery stack under several design and operation factors. Predicted battery life is suggested according to the simulation results.
분산전원이 연계된 제습 HVAC 시스템의 성능해석 연구
정융(Yoong Jung),류진우(Jin Woo Yoo),김민수(Min Soo Kim) 대한기계학회 2015 대한기계학회 춘추학술대회 Vol.2015 No.11
A hybrid heat pump - desiccant rotor HVAC system coupled to decentralized cogenerator is proposed. Despite high total energy efficiency of micro - CCHP system, there still exist substantial dependence on purchased electricity and extra boiling which reduces the advantages of CCHP system. To solve the problem, air to water heat pump is adopted to intensifying desiccant HVAC system. A mathematical system model including air to water heat pump, desiccant cooling system, PEMFC for cogeneration is devised to investigate the characteristics and performance of desiccant cooling system and heat pump water heating/cooling system. Based on the calculation results, optimal operational condition and system efficiency according the ambient condition is proposed.
하이브리드/전기자동차용 영구자석 모터의 열적 모델링과 냉각 시스템 최적 운전 제어에 대한 연구
김선진(Sunjin Kim),김귀택(Gwiteak Kim),정융(Yoong Jung),김민수(Min Soo Kim) 대한기계학회 2017 대한기계학회 춘추학술대회 Vol.2017 No.11
Because of the environmental issues, hybrid/electric vehicles are becoming the focus of the automotive industry and research field. From this trend, permanent magnet (PM) motors are receiving much attention because hybrid/electric vehicles can replace internal combustion engine as a PM motor to generate driving force. Like internal combustion engine, PM motor can produce power and also heat losses during the driving mode. So PM motor need cooling system to maintain the temperature lower than the temperature limit. So minimizing power consumption for the cooling system can directly affect the mileage extension of electric vehicle. So in this paper, optimal operation control of motor cooling system is studied based on the thermal characteristics of PM motor. For the optimizing PM motor cooling system, thermal modeling of PM motor is also conducted. If heat losses and heat transfer characteristics of PM motor are considered, cooling system control can be conducted efficiently. From the saving power of the cooling system, mileage extension of electric vehicle is calculated for the given driving mode. If the algorithm of the cooling system control is applied for another system of electric vehicle like battery or any other electrical component, electric vehicle driving range will be extended or battery size can be minimized.
최종민(Jongmin Choi),김귀택(Gwitaek Kim),김선진(Sunjin Kim),정융(Yoong Jung),김민수(Min Soo Kim) 대한설비공학회 2019 대한설비공학회 학술발표대회논문집 Vol.2019 No.-
In this study, semi lumped parameter thermal modelling is developed for transient analysis of 4 kW TEFC(totally enclosed fan cooled) induction motor. In order to validate the method, the previous experimental and analytic results using lumped parameter thermal modelling is adopted from Amar Bousbaine (1993). Various heat transfer coefficient correlations are chosen for this modelling, which are from literatures and widely applied for heat transfer analysis accompanying with the laminar or turbulent flow around electric motors. The results show comparatively similar tendency except for stator and end cap air region, which are limited in calculation due to complicated heat transfer mechanism nearby and intrinsic simplicity of semi lumped parameter thermal modelling.