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실내·외 블라인드의 Slat 반사율에 따라 창호 일사투과량 및 그에 따른 벽체 대류열획득량 분석
현인탁(In-Tak Hyun),이재호(Jae-Ho Lee),윤여범(Yeo-Beom Yoon),이광호(Kwang Ho Lee) 대한설비공학회 2014 설비공학 논문집 Vol.26 No.12
Nowadays, to make buildings light weight and aesthetically pleasing, curtain wall structure are commonly used. Therefore, window to wall ratio is increasing, which has caused cooling and heating load in crease in buildings as well. This phenomenon has negative impact from energy point of view. This paper analyzes window and wall convective heat gain when the slat reflectance of external and internal blinds are changed for the better understanding of the fundamentals behind the phenomena. It was observed that, if slat reflectance is increased, window transmitted solar increases and convection heat rate is clearly affected. Among six surfaces including four walls, ceiling and floor, maximum convection heat rate occurs on the south wall in summer. On the other hand, ceiling and floor showed the lowest convection heat gain, since they are shared by adjacent floors.
이코노마이저 제어 방법에 따른 사무소 건물의 냉방 에너지 성능 비교
손정은(Jeong-Eun Son),현인탁(In-Tak Hyun),이재호(Jea-Ho Lee),이광호(Kwang Ho Lee) 대한설비공학회 2015 설비공학 논문집 Vol.27 No.8
The advantages of a printed circuit heat exchanger (PCHE) are the compactness and efficiency derived from its heat-transfer characteristics; furthermore, a PCHE for which a diffusion bonding method was used during production can be applied to extreme environments such as a cryogenic condition. In this study, a micro-channel PCHE fabricated by diffusion bonding was investigated in a cryogenic environment regarding its thermal performance and the pressure drop. The test rig consists of an LN2 storage tank, vaporizers, heaters, and a cold box, whereby the vaporized cryogenic nitrogen flows in hot and cold streams. The overall heat-transfer coefficients were evaluated and compared with traditional correlations. Lastly, we suggested the modified heat-transfer correlations for a PCHE in a cryogenic condition.