Temperature and Energy-Saving Effects of Applying the Mobile Double Layers Thermal Screen in A Grcenhouse

The mobile double layers thermal screen(MDLTS) consists of the film polythere and film plating aluminum. The effects of setting were studied in the greenhouse. The results show that the MDLTS can postpone the commencement of heating facilities by about a month in early winter. When compared with double inflated plastic, the MDLTS increases temperature by 2.5～3.5℃ and 2℃ at 7:00 and 12:00, respectively, after starting up the heating facilities on rainy or snowy days. The effects of conserving heat and saving energy with the MDLTS was better than that of the double inflated plastic. In the greenhouse setting, the MDLTS had less illumination than that in CK and was better than that in the double inflated plastic house on a clear day. However the illumination was less than that in the greenhouse with double inflated plastic on rainy or snowy days. On a cloudy day, the ratio of the area affected by the film of polythene illumination to the area of house at the plane aparting from the earth is decided by the formula A=1-(β-x)/(α·tgα).