Three pad face air velocities ranged between 0.45 and 1.01 m s -1 and two thicknesses of 10 and 15 cm were used in the investigation of the cooling performance criteria. Three new evaporative cooling pads represented by Cryperus Alopecuroides Rottb (Samar), Cyerus Alternifolius (Purdy) and Cyperus Rotundus l (Nut-grass or Se'd) were adapted and evaluated. The two cooling systems were compared under the same condition. In addition, a thin water film was applied on the roof of one greenhouse to study the effect of roof water film and fan-pad (combined system) on the cooling performance. The two greenhouses were cooled using fan-pad system. Two identical small-scale greenhouses were designed, constructed, and installed on an open roof of a domestic house. The present study was devoted to construct an evaporative cooling system to reduce heat stress inside a greenhouse. During hot seasons the heat input to a greenhouse causes the internal temperature to exceed its optimal value. Greenhouse technology is a viable option for sustainable crop production in the regions of adverse climatic conditions. Greenhouse, evaporative cooling, fan-pad system, pad material, roof water flow Abstract
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