Experimental Study on Indoor Thermal Environment of Double-Film Solar Greenhouse in the Cold Region of Northwest China
With the rapid development of agricultural facilities in China,daylight greenhouses are more and more widely used in the cold regions of Northwest China.As the main agricultural facilities for winter crop production in the northern region of China,the thermal environment of daylight greenhouse has an important impact on crop growth.This paper takes the double film solar greenhouse in the cold area of northwest as the research object,and studies the changes of indoor thermal environment of the double film solar greenhouse through comparative test and analysis with the single film solar greenhouse in the same location and volume.The test results show that:compared with single-film solar greenhouse,double-film solar greenhouse indoor temperature is higher than sin-gle-film solar greenhouse and humidity is smaller than single-film solar greenhouse;CO2 concentration is 14％higher than single-film solar greenhouse;soil temperature is higher than single-film solar greenhouse;the relative humidity is smaller than single-film solar greenhouse;the shallow soil temperature fluctuations by the influence of the external environment is smaller than the single-film solar greenhouse.Double-film solar greenhouse indoor thermal environment is more favorable to the growth of crops in cold regions of Northwest China.The indoor thermal environment of double-film solar greenhouse is more favorable for the growth of crops in the cold region of Northwest China.The results of the study are of great significance to the optimization and control of the indoor thermal environment of daytime greenhouses in Northwest China,the design of greenhouse and the improvement of crop yield.
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