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데이터센터의 합리적인 환경제어를 위한 공기분배 시스템에 대한 연구
조진균(Jin-kyun Cho),차지형(Ji-hyoung Cha),홍민호(Min-ho Hong),연창근(Chang-kun Yeon) 대한설비공학회 2008 대한설비공학회 학술발표대회논문집 Vol.2008 No.2
The cooling of data centers has emerged as a significant challenge as the density of IT server increases. Server installations, along with the shrinking physical size of servers and storage systems, has resulted in high power density and high heat density. The introduction of high density enclosures into a data center creates the potential for "hot spots" within the room that the cooling system may not be able to address, since traditional designs assume relatively uniform cooling patterns within a data center. The cooling system for data center consists of a CRAC or CRAH unit and the associated air distribution system. It is the configuration of the distribution system that primarily distinguishes the different types of data center cooling systems, this is the main subject of this paper.
동절기 실내 과습방지를 위한 자동환기시스템 제어장치 개발에 관한 연구
김영탁(Kim, Young-Tag),조우진(Cho, Woo-Jin),이규남(Rhee, Kyu-Nam),황민규(Hwang, Min-Kyu),이성재(Lee, Sueng-Jae),차지형(Cha, Ji-Hyoung) 한국태양에너지학회 2012 한국태양에너지학회 학술대회논문집 Vol.2012 No.11
The surface condensation in winter season can be prevented with two methods. The first method is increasing surface temperature of space envelopes with insulation and the second method is decreasing indoor vapor pressure with ventilation. But additional insulation after construction completion is not easy. So, ventilation is more suitable to solve condensation problems. Generally, there are two types of ventilation methods in residential buildings. One is natural ventilation by opening windows, but the efficiency defends on occupant’s action whether they open the windows or not. The other is mechanical ventilation by recovery ventilator(air-to-air heat exchanger). This can provide not only regular ventilation but also high air quality and less condensation problems, if it can be controlled automatically. Therefore, it is necessary to develop automatic control device of ventilation system for preventing condensation with decreasing indoor vapor pressure. To achieve it, this paper suggests CPA(Condensation Preventing Algorithm) for the auto-control device of ventilation system.
조우진(Cho, Woo-Jin),이규남(Rhee, Kyu-Nam),황민규(Hwang, Min-Kyu),김영탁(Kim, Young-Tag),이성재(Lee, Sueng-Jae),차지형(Cha, Ji-Hyoung) 한국태양에너지학회 2012 한국태양에너지학회 학술대회논문집 Vol.2012 No.11
Surface condensation on the windows is liable to occur if the indoor humidity is increased due to occupants’ activity, perspiration and so on. The ventilation system, which is installed for the purpose of supplying fresh air and exhausting contaminated air, can be utilized to prevent surface condensation by decreasing indoor humidity. Although the condensation can be definitely prevented by operating the ventilation system continuously, it is common that the ventilation system is not operated due to the concern about electricity charges. In the previous study by this research team, the ventilation system was developed which can prevent over-humidification by discharging indoor humidity only if the minimum surface temperature of the window becomes lower than dew point temperature. In this study, the developed ventilation system was installed in the residential building in order to evaluate the performance of preventing condensation and energy consumption. In addition, temperature difference ratio of the window and minimum operation time of the system, which are required for the optimum operation of the ventilation system, were suggested. The results of the experiment shows that the developed ventilation system can prevent the surface condensation with the less energy consumption (14∼35%) than when the conventional ventilation system is operated continuously.