Abstract:

The changing laws of solar radiation, utilization efficiency of solar radiation and the correlation between solar radiation and net radiation, as well as the influence of film on the utilization efficiency and correlation were studied. It was to provide theoretical foundation for optimizing structure and controlling environment of solar greenhouse. Solar radiation inside was timely measured, and analyzed by comparing with solar radiation outside. Radiation environment under different films was contrasted. The results showed that: from September to next April, the mean monthly solar radiation inside decreased early, and increased late, December was 4.45 MJ/m2, April was 11.68 MJ/m2. In November, the utilization efficiency of solar radiation was the best, the value of Qin/Qout was 75.99%, and the Qout-Qin was only 1.67 MJ/m2. There was a fine linear correlation between solar radiation and net radiation, the equation in March and April was y=0.8277x-0.2909, and R was 0.995. Comparing with the new film (film B), the utilization efficiency of the old film (film A) was less than film B up to 13%, and the equation in March and April was y=0.9223x-0.1762, R was 0.985. The research on solar radiation’s changing laws in solar greenhouse, and the facility’s influence was the basic of environment control.