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                                温室大棚的保温原理

                                2021-6-4??????浏览:

                                由于反季节蔬菜价格较高,利润相对可观,温室大棚被广泛应用起来,即使是寒冷的冬季,大棚里也是十分温暖,室内温度高于外界是有原因的。


                                第一、对于太阳辐射来说,塑料大棚和玻璃几乎是“透明”的,太阳辐射可以大部分进入。

                                第二、对于地面长波辐射来说,塑料大棚和玻璃却是不“透明”的,长波辐射很少能透过。这样,温室大棚就使得外界的太阳能量能不断进入室内,而室内的热量却很少散失出去,从而起到调节温度的作用。阳光透过薄膜照射到室内却难以散发出去,增加的温度要比流失的温度多得多,因此室内温度比较高。


                                第三、棚内地表本身具有温度的,由于薄膜的阻挡,外面的冷空气难以进入,无法与室内的空气进行气体交换,温度就高,再加上薄膜的功能是只进阳光不进空气,所以室内的温度比室外气温要高的多。

                                这也就是为什么温室大棚在北方寒冷地区被广泛应用的原因了。

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