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Peyman Gholamali Zadeh,Yijun Wang,JAE DONG CHUNG 대한기계학회 2022 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.36 No.7
Different battery thermal management (BTM) for a 18650 cylindrical Li-ion battery pack were simulated based on the lumped model. Phase change material (PCM) was introduced for its benefits: high latent heat and uniform melting temperature. However, the heat absorbed into the PCM was not dissipated to the environment. Thus, an additional cooling mechanism was required to reach satisfying temperature limits (45 °C for lifespan and 50 °C for safety). These include natural convection cooling, forced convection cooling, finned-natural convection cooling, PCM cooling, and PCM cooling coupled with liquid cooling channels. The temperature of the battery pack using natural convection, finned-natural convection, and PCM cooling reached 62.1 °C, 55 °C, and 50 °C, which were equal or over (50 °C), while it decreased to 49 °C using forced convection, which was over (45 °C). However, PCM coupled with liquid cooling channels satisfied the requirements, and the temperature was reduced to 42 °C using this system.
환경 조건에 따른 버스 내부 수치 해석적 연구: (2) 온열감 평가
박종훈,Peyman Gholamali Zadeh,Mahdi Koushaeian,Abdullah Khan,Xuan Quang Duong,정재동 대한설비공학회 2023 설비공학 논문집 Vol.35 No.12
The majority of our modern life is spent indoors, and with this comes an increased emphasis on the importance of indoor comfort for the occupants. This applies not only to residential or office spaces but also to transportation; passenger comfort in public transportation such as buses is also required. However, there is a lack of research on the expected thermal sensation, which is one of the factors that determine indoor comfort in buses and mean radiant temperature, which has a significant impact on thermal sensation. Therefore, this study analyzes the heat flow characteristics in the vehicle according to the supply air volume, number of passengers, and set temperature for a city bus in summer, and evaluates the Mean Radiant Temperature (MRT) and Predicted Mean Vote (PMV) obtained from it.
환경 조건에 따른 버스 내부 수치 해석적 연구: (1) 열 및 유동특성 평가
박종훈,Peyman Gholamali Zadeh,Koushaeian Mahdi,Abdullah Khan,Xuan Quang Duong,정재동 대한설비공학회 2023 설비공학 논문집 Vol.35 No.9
With the increasing demand for transportation and long travel hours, enhancing the interior environment of automobiles has become paramount. While air conditioning systems play a crucial role in creating a comfortable indoor space, they often contribute to reduced fuel efficiency by drawing power from the vehicle. Bus heating and cooling systems must operate effectively to respond to the changing environment conditions while minimizing energy waste from overcooling and overheating. This study assesses the internal thermal environment under various conditions and proposes criteria for system configuration settings. Based on our findings, we recommend a temperature setting of 18 degrees Celsius or higher for buses accommodating 25 passengers, alongside an airspeed setting ranging from weak (approximately 1 m/s) to strong (approximately 5 m/s). In cases where the passenger count falls below 25, the internal temperature decreases correspondingly, necessitating an increase in the temperature. These recommendations align with the ISO 7700 standards.
A Novel cold plate of battery thermal management system designed by topology optimization
Yijun Wang,Peyman Gholamali Zadeh,Jae Dong Chung 대한설비공학회 2022 대한설비공학회 학술발표대회논문집 Vol.2022 No.6
The cold plate is designed to cool the rectangular lithium-ion battery by topology optimization technique. A two-dimensional model was assumed to save the computing effort and time. In this study, numerical analysis of topology optimization cold plate is implemented using COMSOL Multiphysics R6.0. Numerical results were compared with the reference model which has six straight channels. The results demonstrate that topology optimization cold plate has a significant influence on the temperature uniformity and maximum temperature differences. When the battery heat generation reach to 10W, comparing with reference cold plate, the standard deviation of temperature Tσ and maximum temperature difference (ΔT<SUB>max</SUB> ) of topology optimization cold plate are decreased by 121% and 82%, respectively. This study indicated that topology optimization is more effective for the higher heat generation rate of battery.