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3차원 구조의 박판 진동형 히트파이프를 이용한 xEV용 배터리 열관리 시스템에 관한 해석적 연구
정종민(Jongmin Jung),전용석(Yongseok Jeon) 대한설비공학회 2022 대한설비공학회 학술발표대회논문집 Vol.2022 No.11
The battery capacity and energy density of the xEV are increasing. As a result, numerous studies on heat pipe-based battery thermal management systems are currently being studied. Due to its straightforward designs and excellent thermal performance, the pulsing heat pipe (PHP) has drawn much attention. However, there is a limit to heat transfer because it is designed in a closed-loop manner at a two-dimensional plane. As a result, the battery pack has an uneven internal temperature and a hot spot in the center. In this study, to prevent such problems, several PHPs are connected to form a three-dimensional structure, in a such a way that all the upper and all the lower parts of each PHP are connected respectively. The three-dimensional structure PHP prevent hot spots in the center of the battery pack and delays dry-out under high heat flux conditions.
소형 쇼케이스용 증기압축사이클에서의 액인젝션을 이용한 포화압축 사이클 가능성 검토
최정(Jeong Choe),정종민(Jongmin Jung),전용석(Yongseok Jeon) 대한설비공학회 2021 설비공학 논문집 Vol.33 No.4
The objective of this study is to decrease the refrigerant temperature at the compressor outlet under high thermal load conditions with low-GWP refrigerants in the showcase vapor compression cycle. When the outside temperature increases, the showcase cycle suffers a reliability problem due to the high discharge temperature. Liquid injection is a good method for decreasing the discharge temperature of the refrigeration cycle. This study presents the development of a simplified simulation model for predicting the performance of a liquid injection showcase cycle. The optimum injection pressures of the showcase cycle with R410A and R32 were presented. In addition, after the quasi-saturation compression cycle was reached through the multi-stage liquid injection control, the effect of reducing the discharge temperature was analyzed. Finally, the optimal number of injections for each of the refrigerant and operating conditions was presented.