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.                 .  , ,              8.               .                  .             .                .                  . Keywords: matt screens; multi layers screens; outside experiment; polyethylene film; shelter from sky radiation I. INTRODUCTION * Achieving favorable environment in the greenhouses under cold winter or hot and sunny summer conditions has become one of the major challenges still facing designers and growers (Abdel-Ghany, 2011). The thermal environment of the greenhouse is based on the relative input and outflow of energy. Greenhouse heating is one of the most energy consuming activities during winter periods. The determination of the quantity of heat transmitted through the cover is an important thermal problem of greenhouses and its rational approach represents a valuable tool for many practical applications (Kittas, 1994). The selection of the cover materia l has a tremendous influence on the crop production capability

Overall Heat Transfer Coefficient Measurement of Covering Materials with Thermal Screens for Greenhouse using the Hot Box Method