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설성훈(Seol Sung-Hoon),윤정인(Yoon Jung-In),이준혁(Lee Joon-Hyuk),차승윤(Cha Seung-Yun),하수정(Ha Su-Jeong) 한국태양에너지학회 2021 한국태양에너지학회 논문집 Vol.41 No.4
In this study, the condensation heat transfer characteristics of the R-1234yf refrigerant were analyzed according to the variation in tube diameter, which were then considered as condenser design data. The inner diameter of the experimental tube was varied from 3.7 ㎜ to 5.3 ㎜. Subsequently, the heat transfer coefficient of R-1234yf was analyzed according to the changes in vapor quality, mass flux, saturation temperature, and pipe diameter. Slug flow was observed at a low mass flux, and annular flow was observed at a high mass flux. Furthermore, it was observed that the heat transfer coefficient’s value increased with increase in the vapor quality and mass flux, whereas it decreased with increase in the tube diameter and saturation temperature. By comparing the heat transfer coefficients of the refrigerants R-134a and R-1234yf, it was found that the heat transfer coefficient of R-134a is higher. Furthermore, four correlations were conducted, and it was found that the correlation of Dobson and Chato and the correlation of Bashar can predict the experimental condensation heat transfer coefficient within an error range of ±10%.
프리쿨러를 적용한 케스케이드 줄-톰슨 냉동기의 성능특성
박상찬(Sang-Chan Park),윤지훈(Ji-Hoon Yoon),설성훈(Sung-Hoon Seol),손창효(Chang-Hyo Son),윤정인(Jung-In Yoon) 대한설비공학회 2022 대한설비공학회 학술발표대회논문집 Vol.2022 No.6
The purpose of this study is to investigate the effect of application of precooler on the performance of the cascade Joule-Thomson cycle. The refrigerants used were zeotropic mixture: blened with R-218, R-23 and R-14, which are non-flammable refrigerants. In addition, the evaporation temperature was set to –110℃ considering the semiconductor process cooling. The results show that the precooler can reduce the capacity of the compressor, condensor and evaporator which was the cascade heat exchanger in the high stage cycle. Furthermore, application of precooler can increase overall COP, although the COP decreased each cycle.
프리쿨러를 적용한 케스케이드 줄-톰슨 냉동기의 성능특성
박상찬(Sang-Chan Park),윤지훈(Ji-Hoon Yoon),설성훈(Sung-Hoon Seol),손창효(Chang-Hyo Son),윤정인(Jung-In Yoon) 대한설비공학회 2022 대한설비공학회 학술발표대회논문집 Vol.2022 No.6
The purpose of this study is to investigate the effect of application of precooler on the performance of the cascade Joule-Thomson cycle. The refrigerants used were zeotropic mixture: blened with R-218, R-23 and R-14, which are non-flammable refrigerants. In addition, the evaporation temperature was set to –110℃ considering the semiconductor process cooling. The results show that the precooler can reduce the capacity of the compressor, condensor and evaporator which was the cascade heat exchanger in the high stage cycle. Furthermore, application of precooler can increase overall COP, although the COP decreased each cycle.