Enhancing the evaporative cooling performance of fan-pad system using alternative pad materials and water film over the greenhouse roof
作者： Nashwa M El-Zan , Refaay R Abo-shieshaa , Mohamed Abdelaziz Eltawil , Mamdouh A Helmy
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摘要: Greenhouse technology is a viable option for sustainable crop production in the regions of adverse climatic conditions. During hot seasons heat input to greenhouse causes internal temperature exceed its optimal value. The present study was devoted construct an evaporative cooling system reduce stress inside greenhouse. Two identical small-scale greenhouses were designed, constructed, and installed on open roof domestic house. two cooled using fan-pad system. In addition, thin water film applied one effect (combined system) performance. systems compared under same condition. Three new pads represented by Cryperus Alopecuroides Rottb (Samar), Cyerus Alternifolius (Purdy) Cyperus Rotundus l (Nut-grass or Se'd) adapted evaluated. pad face air velocities ranged between 0.45 1.01 m s-1 thicknesses 10 15 cm used investigation performance criteria. Results showed that proposed suggested able maintain acceptable microclimatic conditions models. Se'd material proved more efficiency reduction. It revealed operated combination flow less than about 1.1 5.44° C morning afternoon respectively. relative humidity increased due humid provided which protects crops from excessive transpiration damage. daily average efficiencies 88.4, 83.1 79.6% obtained Se'd, Purdy Samar, respectively during testing days combined at thickness velocity. Se'd highest as other materials could be alternative material. Keywords: greenhouse, cooling, system, material,
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