Influences of Sunny and Cloudy Days on the Temperature in Sunlight Greenhouses with Different Structures

[Objective]The purpose was to study the changing rule of temperature in sunlight greenhouses with different structure types under different weather conditions.[Method]The 2 sunlight greenhouses with different structures were constructed and their outdoor weather conditions and indoor temperature changes were observed and recorded in typical cloudy and sunny days.[Result]In sunny days,the temperature in Greenhouse 1 was ascending and decreasing faster than that in Greenhouse 2;after 17:00,the temperature of Point a in Greenhouse 1 was lower than that in Greenhouse 2;the temperature rising time of Greenhouse 2 was longer;from 11:00 to 17:00,the temperature of Point c in Greenhouse 1 was lower than that in Greenhouse 2 and their temperatures were relatively close in the other time;from 11:00 to 16:00,the temperature of Point d in Greenhouse 1 was ascending faster,its highest temperature was higher than that in Greenhouse 2 and their difference was 3.0℃.In cloudy days,the temperatures showed waving downward trend in both the 2 greenhouses in the whole day;at 23:00,the temperatures of Point a and b in Greenhouse 1 were decreased to 10.5 and 7.8℃resp.and that in Greenhouse 2 were decreased to g.2 and 10.5℃resp.;the temperature of Point c in Greenhouse 1 was always lower than that in Greenhouse 2;the temperature of Point d in Greenhouse 1 changed more slowly.[Conclusion]The insulation effect of Greenhouse 2 was better,its temperature change was slower and it should be the important popularized greenhouse type in Shandong Province.