A Study on Comparison of Cooling Efficiency for the East-China Type Multi-span Plastic Greenhouse in Summer

Based on preliminary experiment and comparative analysis, Authors found a system to lower temperature inside greenhouse during the muggy summer by spraying water above the solar screen inside, which is the most economical and effective cooling method adapting to the typical climate of the East-China in summer. The temperatures of ambient air inside greenhouse 6℃ lower than those outside and 10℃ lower than those Inside comparative greenhouse in accordance with system being used while the mean effectiveness of the cooling system was 80%. In addition to, the paper has also discussed the relationship between the cooling efficiency and temperature of outside greenhouse and effects of types of spraying and weather. [