자연환기 온실의 환기 회수에 따른 포그 냉방시스템의 냉방 효과 = The Cooling Effect of Fog Cooling System as Affected by Air Exchange Rate in Natural Ventilation Greenhouse

다국어 초록 (Multilingual Abstract)

The cooling effect of a fog cooling system has a close relationship to air flow and relative humidityin the greenhouse. From the VETH chart for cooling design, a cooling efficiency can be improved bymeans of increasing the air exchange rate and the amount of sprayed water. In the no shading exper-imental greenhouse by time control, when average air exchange rate was 0.77times min-1 and spraywater amount was 2,009 g, inside temperature of the greenhouse was 31oC that was almost close tooutside temperature and cooling efficiency was 82%. When average air exchange rate was 0.26timesmin-1 and spray water amount was 1,256 g, inside air temperature was 37.1oC that was close to tem-perature of the greenhouse that was no cooling and 70% shading greenhouse environment. Whenaverage air exchange rate was 2.59times min-1, spray water amount was 2,009 g and shading ratewas 70%, inside relative humidity of the greenhouse was increased, but temperature was notdecreased. When average air exchange rate was 2.33timesmin-1 and spray water amount was2,09 g, inside temperature was 31.4 and at that time maximum wind speed at the air inlet of green-house was 1.9 m s-1. Since time controller sprayed amount of constant water at a given interval, someof sprayed water remained not to be evaporated, which increased relative humidity and decreasedcooling efficiency. Because the shading screen prevented air flow in the greenhouse, it also caused theevaporation efficiency to be decreased. In order to increase cooling efficiency, it was necessary to studyon controling by relative humidity and air circulation in the greenhouse.