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사방 토출식 천장형 실내기의 냉기 토출 각도가 실내 온열 쾌적감에 미치는 영향
박성관(Sung Kwan Park),지선구(Seon Koo Chee),양근영(Geunyoung Yang),오상경(Sang Kyoung Oh) 대한기계학회 2001 대한기계학회 춘추학술대회 Vol.2001 No.9
It is necessary to develop the air control technique of air conditioning to make a comfort space in the occupancy zone through the detail analysis of temperature and flow inside room. This study concentrates on analysis of indoor thermal environment by controlling air guide system of indoor-unit installed in the ceiling of room. This paper studies how to increase the indoor comfort zone through the air control, and shows the guideline to design the efficient air guide duct of ceiling type. The indoor thermal and flow field are investigated both experimentally and numerically. Test apparatus simulating an air-conditioned room with the ceiling type indoor unit is made to measure the temperature and velocity profile. Commercial CFD code is used to understand the flow distribution and the optimal condition for discharge angle of cooling air. Computational results are analyzed and compared with the experimental result, and used for estimation of indoor thermal comfort index, e.g., PMV. The optimum discharge angle is about 40˚ for an air cooling in this study.
설치 각도와 입구 습도가 알루미늄 증발기의 공기측 성능에 미치는 영향
김만회(Man-Hoe Kim),Sumin Song,C.W. Bullard,오상경(Sang Kyoung Oh) 대한기계학회 2001 대한기계학회 춘추학술대회 Vol.2001 No.9
The effect of air inlet humidity condition on the air-side heat transfer and pressure drop characteristics for an inclined brazed aluminum heat exchanger has been investigated experimentally. For a heat exchanger with a louver angle of 27˚, fin pitch of 2.1 ㎜ and flow depth of 27.9 ㎜, a series of tests are conducted for the air-side Reynolds numbers of 80-400, with variation of inlet humidity condition. The heat transfer data are obtained for wet condition only and the pressure drop data are measured for both dry and wet conditions. The inlet air temperature and relative humidity range are 12℃ and 60-90 %, respectively. The inclination angles (θ) from the vertical position are 0˚, 14˚, 45˚, and 67˚ clockwise (leeward direction). The inclination angles affect moderately the sensible heat transfer coefficient for wet condition, and the pressure drops for both dry and wet conditions increase systematically with the inclination angle. The heat transfer and pressure drop characteristics under wet condition are not influenced substantially by the air inlet humidity for θ ≤ 45˚. The effect of the louver directions at the inlet and outlet of the inclined heat exchanger on the performance is also addressed.