基于蓄热墙和内保温的钢架大棚保温模式研究

Study on Heat Insulation Mode of Steel Frame Shed Based on Heat Storage Wall and Interior Thermal Insulation

对采用蓄热墙、内保温及PO膜覆盖、EVA膜覆盖4种保温模式的大棚分别进行棚内温度、湿度的定时记录分析。结果表明:蓄热墙和内保温模式不仅对夜间最低温度有较大提升,而且对全天的温度也有较大的提升作用。在受冷空气影响的低温期,温度越低,这2种保温模式和对照的差异越大。在缺少太阳辐射的阴天条件下,钢架大棚增加蓄热墙或内保温对全天时段内的温度均有稳定的提升作用,PO膜覆盖和EVA膜覆盖的棚内温度基本一致,与之相比,蓄热墙的增温作用最明显,增加约6℃,内保温的增温作用次之,增加约3℃。4种保温模式的棚内相对湿度变化与温度变化相一致,蓄热墙大棚的相对湿度略低,在阴天条件下,蓄热墙大棚的相对湿度在白天可以下降到90%以下。

The temperature and humidity in the greenhouse with four kinds of thermal insulation modes, including heat storage wall, interior thermal insulation and PO film covering and EVA film covering, were recorded and analyzed respectively.The results showed that the heat storage wall and the internal heat preservation model not only increase the minimum temperature at night, but also the whole day temperature.The lower the temperature, the greater the difference between the two heat preservation modes and the control.Under the condition of lack of solar radiation, heat storage wall or interior thermal insulation in steel frame sheds has a stable lifting effect on the temperature during the whole day, and the temperature in the shed covered by PO film is basically the same as that by EVA film.The effect of heat storage wall is the most obvious, which increases about 6 ℃, followed by internal heat preservation, and increases about 3 ℃.The change of relative humidity in the four heat preservation modes is consistent with the change of temperature.The relative humidity of the heat storage wall shed is slightly lower, and the relative humidity of the heat storage wall shed can be reduced to less than 90% during the daytime under overcast conditions.