http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Aluminium Fumarate MOF 적용 흡착식 냉동기의 기후 및 구동조건에 따른 성능분석
설성훈(Sung-Hoon Seol) 한국동력기계공학회 2024 동력시스템공학회지 Vol.28 No.2
물을 냉매로 사용하는 흡착식 냉동기(AHP)는 냉매 자체도 완전히 친환경적이며 구동하는 에너지가 증기압축식 냉동기에 비해 약 25% 수준으로 알려져 있지만, 흡착제의 제한적인 수분 흡착량 등의 이유로 시스템의 체적이 크다는 단점이 존재한다. 본 연구에서는 흡착용량이 상대적으로 큰 MOF의 일종인 Aluminium fumarate 흡착제 적용 AHP를 두 가지 기후 조건, 즉 Hot and humid 지역과 Moderate and dry 지역에 대해 시뮬레이션 분석을 하여 흡탈착 전환시간 및 흡착제의 질량에 따라 해당 기후조건에서는 어떠한 성능특성이 나타나는지를 파악하였다. 흡착기 개수가 적은 경우, 흡탈착 전환시간이 8분에서 16분으로 늘어남에 따라 AHP 냉방 에너지는 RD Silica-gel의 경우 29.19%, Aluminium fumarate의 경우 5.44% 감소하였으며, 흡착기 개수를 4EA에서 16EA로 증가시킴에 따라 Aluminium fumarte와 RD Silica-gel에서 각각 1.31배, 2.11배 증가한 AHP 냉방 에너지를 나타냈다. The adsorption heat pump (AHP) that utilizes water as a refrigerant is known for being environmentally friendly, and the energy required for operation is approximately 25% of that in vapor compression refrigeration systems. However, the system has a drawback of large volume due to limitations in the adsorption capacity of the adsorbent. In this study, performance analysis of aluminium fumarate, which is a type of MOF with relatively large adsorption capacity, was conducted under two climate conditions: hot and humid, and moderate and dry. This study aimed to understand the performance characteristics under these climate conditions with variations in cycle time and adsorbent mass. In cases with a low number of adsorbers, the AHP cooling energy decreased by 29.19% for RD silica-gel and 5.44% for aluminium fumarate, as the cycle time increased from eight minutes to sixteen minutes. Increasing the number of adsorption units from 4EA to 16EA resulted in a 1.31 times and 2.11 times increase in AHP cooling energy for aluminium fumarate and RD silica-gel, respectively.
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.