Effects of Greenhouse Orientation and Latitude on Direct Solar Radiation Transmissivity

Effects of greenhouse orientation, number of spans, time of year and the latitude on the direct solar radiation trans-missivity into greenhouses were analyzed using a mathematical model. In low latitudes, effects of the above - mentioned factors (except for latitude)are less remarkable than in high latitudes. However,spatial irregulatities of irradiance within EW - oriented greenhouses will be a problem not only in high latitudes but also in low latitudes.