Plastic greenhouse optimization design and its thermal preservation

Based on the seasonal changes with opposite position changes of the sun and the earth,astronomy and meteorology knowledges,the optimal parameters of plastic greenhouse design were put up by the principles of mathematics and physics.The results indicate that this kind of plastic greenhouse can prolong the sunshine duration about 15 minutes in the winter agricultural production.Air temperature of the greenhouse is higher about 2 to 3 ℃ than that of other solar greenhouses.And its thermal preservation is better.