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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.
R22 대체냉매 에어컨의 동적 특성에 대한 실험적 연구
김만회,Kim, Man-Hoe 대한기계학회 1998 大韓機械學會論文集B Vol.22 No.3
This study presents experimental results on the shut-down and start-up characteristics of a residential split-system air-conditioner with capillary tube, using R410A as a R22 alternative refrigerant. During shut-down, the transient characteristics are evaluated by measuring the high side and low side pressures and temperatures of the system. The dynamic behavior of the system after start-up is also investigated at the high temperature cooling test condition. All experiments are performed in psychrometric calorimeter. The cooling capacity, power consumption, dehumidification capacity and cycle characteristics after start-up are analyzed.