Abstract
In order to collect solar heat by the greenhouse efficiently, the points question on the solar radiation were studied.
At first, solar radiation on a floor, an outside FRP and a inside FRP surface of the greenhouse were estimated and then expressed as a function of azimuth angle, heat collection area and solar radiation on horizontal outside surface.
Secondly, when the greenhouse was utilized as an air-type collector, it became apparent that the optimum position of heat collection face was nearer the roof of the house than the floor.
Furthermore, in case that a dryer was placed in the house, the solar radiation on the heat collection area was calculated and the factors affecting on the radiation were investigated.