Effects of Greenhouse Surface Inclination and Orientation on Exterior Longwave Radiation Exchange
AbstractThe radiation exchange at greenhouse surfaces is of great interest for energy balance. At these surfaces, the usual factors of interest are local temperatures and energy fluxes. The greenhouse surfaces are inclined and oriented in various ways and thus can influence the radiation exchange. This study was carried out to determine the effects of surface inclination and orientation on the longwave radiation exchange. For this purpose, four identical thermal boxes were developed to simulate the roof and the wall greenhouse surfaces. The surface temperatures and the atmospheric parameters were noted under all-sky conditions. Variations were found in the surface-to-air temperature differences at the roof and the wall surfaces. The exposed roofs registered lower temperature differences than the walls. However, the surface orientation effect on the longwave radiation exchange was insignificant. Although the effect of orientation on the radiation exchange was negligible, the effect of surface inclination was evident especially on clear-sky nights. Overall, the results form a basis for decisions on greenhouse design improvements and climate control interventions in the horticultural industry.
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