Experimental Study On Thermal Insulation Performance Of Winter Greenhouse

In this study,the test is made on a greenhouse located in Yongchun in south Changchun constructed by Jilin Academy of Agricultural Machinery. Through analysis on the data collected from the greenhouse to understand effect of lighting,insulation,thermal insulation and heat preservation quilt on thermal insulation performance.The main conclusions drawn are as follows:(1) Light distribution inside the greenhouse is non-uniform and dynamic changing.It can be concluded through experiments:the most important factors that impact the greenhouse light environment are sun position and light transmittance.(2) Temperature distribution inside the greenhouse is also non-uniform and dynamic.Through the analysis of observational data,we can see that temperature and light are closely linked.Therefore,light is another important factor that affect the heat preservation measures.(3) Through the experimental determination we can concludes that inside thermal insulation curtain can increase the maximum night temperature in greenhouse up to 3-4℃.(4) By using of underground heat exchanger,ground temperature in greenhouse can rise up to 2℃.