http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
전기자동차 배터리팩용 고효율 Heat Pipe 냉각모듈 개발
박용석(Yong-Seok Park),성홍석(Hong-Seok Seong),성동민(Dong-min Seong),채문규(Moon-gyu Chae),서정세(Jeong-Se Suh) 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.05
When it comes to development of electric vehicles(EV), much attention has been paid to the thermal management of batteries. The liquid cooling has been increasingly used instead of other cooling methods, such as air cooling and phase change material cooling. In this study, battery pack was used to designing suitable cooling plates for pouch type of battery. The numerical analysis was performed by variables : Inlet Temperature, Flow Rate of Coolant and 3 types of the cooling plate’s Channels. As the flow rate increased, the maximum temperature and average temperature were lowered, and New Model 2 was the most effective shape for decreasing battery’s maximum and average temperature. On the other hand, Pressure drop isn’t much considered as important things for cooling battery’s temperature. Therefore we optimized and focused on our designed channels of cooling plates how much dropped battery’s temperature degrees.
박용석(Yong-Seok Park),성홍석(Hong-Seok Seong),서정세(Jeong-Se Suh) 한국기계가공학회 2019 한국기계가공학회지 Vol.18 No.6
The evaporator is a key driver of an air conditioning system’s efficiency. In this study, we study methods of maximizing the efficiency of a Massey Ferguson (MF) evaporator by measuring how the cooling performance of different shapes vary with temperature. We varied the tube insertion depth as well as the shape of the evaporator’s header and tube. When we compare header shapes of "D", "Ellipse", and "Quadrangle" types, we find that the elliptical header creates the smallest pressure loss and the highest temperature difference. Between tube shapes of "Rectangular", "Projection", and "Circular" types, the "Projection" type tube creates the most temperature difference. We also investigated the depth of tube insertion in the header and find that tube insertion of 5 - 10 mm is feasible; we selected the depths of 5, 7, and 10 mm since they corresponded to approximately 30%, 50%, and 70% of the total width of the header. The tube insertion test demonstrated that a tube insertion depth of 7 mm creates the least pressure loss and the highest temperature difference. In conclusion, the optimal evaporator design uses an "Ellipse" type header, "Projection" type tube, and a tube insertion depth between 30 and 50% of the header width.
Numerical Analysis of Freezing Phenomena of Water around the Channel Tube of MF Evaporator
Yong-Seok Park(박용석),Hong-Seok Seong(성홍석),Jeong-Se Suh(서정세) 한국기계가공학회 2020 한국기계가공학회지 Vol.19 No.1
In this study, the process of freezing around two consecutively arranged channel tubes used for evaporator heat exchange was numerically investigated. Numerical results confirmed that the vortex occurred between the front channel and the rear channel and also that the vortex occurred due to the rapid change of the channel at the rear of the rear channel. These vortices were found to play a role in reducing the ice layer to some extent by the growth of the ice layer at the front and rear of the channel tube. The freezing layer showed a tendency to gradually increase as it passed through the channel pipe. As the wall temperature in the channel pipe decreased, the thickness of the freezing layer increased. As the flow rate of water slowed, the thickness of the freezing layer became thicker. In particular, in the case of a slow flow rate of 0.03 m/s, the freezing layers of the front channel pipe and the rear channel pipe were connected to each other. The narrower the channel, the thinner the freezing layer was in both the front and rear channel tubes. It is found that these thin freezing layers are caused by the low thickness of the temperature boundary layer formed around the channel tube.