Study on Thermal Insulation Covering Materials ofHoneycomb Plastic Sheet

Different kinds of thermal insulation materials used in solar greenhouses were summarized. In accordance with the present problems of traditional thermal insulation materials, honeycomb plastic sheet was proposed to be a new type covering of solar greenhouses. The theoretical calculation of the heat transfer coefficient (U) of the covering sheets showed that the U of aluminized honeycomb plastic sheet (AHPS) was 35 %～70 % lower than that of honeycomb plastic sheet (HPS). The U was 10 % lower when aluminium foil faced upwards than downwards. PE AHPS was better than PVC AHPS when isolation was concerned.