Direct Solar Radiation Analysis Of Greenhouse By UsingComputer Simulation Techniques

Greenhouse is a main type of protected cultivation, according with develop trend of mordem agriculture. Many aspects are influenced by greenhouse structure shap. All of these, the influence on growth environment of the crops inside greenhouse is an important fact, for example, the difference in the shape of roof curved surface~ slope ~. cornmected amount and the height of ridge and gutter in greenhouse, will produce difference Light-transmissvity. The low light-transmissivity will reduce greenhouse effect. It will be unfavorable that crop material synthesize in photosynthesis process and reach to growth accumulation temperature rapidly. In other words, it will reduce the yield and growth rate of the crop.The paper summarizes the other's research theory. Applying the knowledge of optics, meterology, architecture, etc, Direct solar environment analysis model of greenhouse have been set up, and the compute simulate program of solar environment was compiled. This software has a large scope of application. It may simulated and analyse all kinds of greenhouse in different region, shape, time and direction, and also be used to analyse temporal and spatial distributions of direct solar radiation within greenhouse and determine greenhouse structure with optital light transmissivity. At last, the reasonable structure shape will be obtained. In addition, fully consider application in agricultural practices to get reasonable parameter of greenhouse. Many important and complicated data can be obtained without experiment through computer programme. The research results could provide a scientific reference to design, study, manage, and raise working efficiency, it also can be used to test quality of greenhouse and be helpful for developing series of greenhouse.