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RISS 인기검색어
- 검색키워드
- 저자 : 齋藤潔(Kiyoshi Saito) (검색결과 2 건)
- 무료
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데이터 센터 국소냉각 CO₂ 열유송 시스템의 특성 분석
정종수(Jong-Soo Jeong),齋藤潔(Kiyoshi Saito),오종택(Jong-Taek Oh),최광일(Kwang-Il Choi) 대한설비공학회 2011 대한설비공학회 학술발표대회논문집 Vol.2011 No.7
In recent years, information and communications technologies (ICT) have found wide use in society, in particular, with the advancement of high-performance and high-density volume of IT devices, and concurrently, the heat value generated from servers and routers per unit area of data centers have also greatly increased. Therefore, we investigated the performance and characteristics of a heat transportation system adopting CO₂ as the working fluid to prevent the occurrence of hot spots and decrease the power consumed by a conventional overall air conditioning system installed at a data center. CO₂ is a much better choice than conventional working fluids because of its electrical reaction stability, the utilization of latent heat, reduction of circulation flow rate, decrease in the tube diameter, and reduction in the pump power. Therefore, this study aims to investigate the performance and characteristics of the server spot cooling heat transportation system under forced circulation by means of experiments and simulations. In the end, we determined the optimum CO₂ circulation rate that maximizes the rejected heat flow rate, and minimizes power consumption.
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마이크로 채널 열교환기를 이용한 CO₂히트펌프의 소형화
정종수(Jong-Soo Jeong),齋藤潔(Kiyoshi Saito),최광일(Kwang-Il Choi),오종택(Jong-Taek Oh) 대한설비공학회 2010 대한설비공학회 학술발표대회논문집 Vol.2010 No.11
CO2 heat pump water heater is being recognized as the effective equipment against global warming. Therefore, it is rapidly getting attention in Japan. In this paper, to realize more miniaturization and high performance of CO₂ heat pump, gas cooler and evaporator designed with microchannel were adopted to typical double-pipe helical type of gas cooler and cross-finned tube type of evaporator respectively, and we performed the simulation for heat transfer characteristic and optimum design in each component that has not been clarified clearly. Based on the optimum design of each heat exchanger, CO₂ heat pump with microchannel heat exchangers was evaluated as system. As the results, the volume of microchannel gas cooler and evaporator became 50% and 85% smaller than typical gas cooler and evaporator for CO₂ heat pump respectively. For analysis of system, it was clarified that CO₂ heat pump with microchannel heat exchangers could be driven as same as conventional CO₂ heat pump by simulation.
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