日光温室内设保温幕的小气候效应及节能效果分析

Effect of Inside Thermal Screen on Microclimate Changing and Energy Saving in Sunlight Greenhouse

为减少夜间日光温室前屋面的热量损失,采用内设保温幕的方法测试其效果。结果表明:①保温幕的保温效果晴天优于阴天,其保温性表现在对气温的提高上,对土壤温度的提高效果不明显。晴天夜间室温平均提高1.5℃,幕上温度降低1.6℃,地表温度提高0.4℃;阴天夜间室温平均提高0.9℃,幕上温度降低0.9℃,地温提高不显著。②保温幕的降湿效果晴天优于阴天。晴天夜间相对湿度平均降低3.7%,绝对湿度降低1.48hPa,统计结果显著;阴天相对湿度平均降低2.9%,绝对湿度降低不显著。③日光温室保温幕能起到一定节能效果,晴天节能6%,阴天节能4%。

In order to reduce energy loss from south roof during nighttimes, the thermal screen was designed in sunlight greenhouse. The results showed： （1）The thermal screen effect on increasing temperature in clear day is better than that of in cloudy day. Using thermal screen is significant for air temperature, but not for soil temperature. In clear days, the average air temperature is 1.5℃ higher, the temperature above thermal screen is 1.6℃ lower and the average temperature on soil surface is 0.4℃ higher than those in contrast greenhouse.（2） The humidity decrease of having thermal screen in clear days exceeds that in cloudy days. In clear days, the average relative humidity and absolute humidity are 3.7% and 1.48hPa lower than those in contrast greenhouse respectively. In cloudy days, the average relative humidity is 2.9% lower and it has no significance for absolute humidity decrease. （3）It has some effect on energy saving to use thermal screen, the energy saving ration of thermal screen is 6% in clear day, and 4% in cloudy day.