Effects of Circulation Fans on Uniformity of Meteorological Factors in Warm Heated Greenhouse
학회지: Journal of Bio-Environment Control 16(4), 291 - 296쪽
저자: 유인호, 조명환, 이시영, 전희, 이인복
개요
This study was conducted to investigate the effects of horizontal air flow produced by circulation fans on horizontal and vertical profiles of meteorological factors. The three-dimensional distributions of air speed, air temperature, relative humidity and carbon dioxide (CO2) concentration were measured with and without the fans in operation. The uniformity of the spatial distribution of meteorological factors decreased as the outside air temperature decreased. In “ fans off" condition, spatial variations of 4.7 oC in air temperature, 19% in relative humidity were detected. When the fans were operated, these variations were reduced to 2.2 and 6.3%, respectively. As the fan capacity increased, the difference in air temperature among sampling points decreased. The fan capacity of 0.0104 m3 s-1m-2 was enough to obtain a reasonable air flow in greenhouse. The vertical profiles of air temperature and CO2 concentration were reasonably uniform regardless of measurement height and fan capacity. Further researches on the position of fans to reduce the difference in air temperature along the width and the effects of using a larger number of smaller fans are required.
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