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다단압축 중간주입을 통한 폐열회수 히트펌프 시스템 연구
이상욱(Sangwook Lee),김귀택(Gwitaek Kim),정융(Yoong Chung),김민수(Min Soo Kim) 대한설비공학회 2020 대한설비공학회 학술발표대회논문집 Vol.2020 No.6
This study suggest a multi-level heat pump system with vapor injection using waste heat recovery. Electric vehicle (EV) cannot obtain waste heat from power generation system like internal combustion engine. Therefore, EV needs extra heat from heat pump or positive tempeature coefficient heater (PTC) in winter for cabing heating. These auxiliary devices consume power from battery, resulting in reduction of driving range. And this phenomenon cause a fear called ‘Range anxiety’, which is a major obstacle from purchasing EV. To solve this problem, this study suggests a vapor injection system using waste heat from electric devices, including motor and battery. General waste heat recovery system in EV absorbs heat at the evaporator. However, large temperature difference between refrigerant and waste heat recovery system entails low heat exchange efficiency and high irreversibility. Suggested mid-level waste heat recovery can recover heat more efficiently. The performance of this heat pump system is investigated with numerical model. Results shows improvement in heating capacity, consequently coefficient of performance and driving range.
최종민(Jongmin Choi),김귀택(Gwi Taek Kim),정융(Yoong Chung),이상욱(Sangwook Lee),김민수(Min Soo Kim) 대한설비공학회 2019 대한설비공학회 학술발표대회논문집 Vol.2019 No.11
In this study, grid tests have been conducted on a transient heat transfer modelling for electric motors in order to study the effect of the number of elements in the modelling. First, the modelling has developed using finite difference method to simulate the temperature change inside the motors when heat losses and cooling occurs. The number of elements in components in the motors such as a shaft, rotor, coil, stator, and frame are set to variables in the modelling. In this study, the number of elements of the coil and stator are altered and the result of each temperature are examined.