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Changle Luguang Plastic Products Co., Ltd. is mainly engaged in various high-temperature shed films, PO films, grouting films, anti-fog films, two-layer films, and mulching films.
The relationship between the thickness of plastic film and thermal insulation
Release time:
2017-11-08
Many people think that the thicker the plastic film, the better the thermal insulation effect.
Many people think that the thicker the plastic film, the better the thermal insulation effect. In fact, this perception is wrong. First of all, let's understand the principle of plastic film insulation: plastic film divides the space into an independent closed space, saves heat, and prevents heat exchange between inside and outside. Where does the heat in the plastic film come from? Its heat mainly comes from the infrared radiation generated by the sunlight irradiating the wall and the reverse radiation of the earth. If the plastic film we choose is too thick, the sunlight will pass through the plastic film. The ability of the plastic film is greatly reduced (the light transmittance of the plastic film we say), resulting in poor temperature in the enclosed space, so it is not that the thicker the plastic film, the better the insulation.
The insulation of the greenhouse does not only rely on plastic film. Under normal circumstances, the temperature difference between the inside and outside of the greenhouse is only about 3-6 degrees. But such a temperature is difficult to be satisfied with the growth of crops in the cold north, so how can we maintain the temperature in the shed. What are the main points of insulation in general sheds?
First of all, we should choose the height of the shed reasonably when building the greenhouse, which is conducive to increasing the lighting.
Secondly, we choose the shed film seasonally. Especially in the cold winter in the north, we generally use PVC weather-resistant and drip-free dust-proof film. This film is not only resistant to weathering and dripping, but also has strong light transmission and thermal insulation performance. It is widely used in winter. shed film.
Build a "shed within a shed". What is a "shed within a shed"? It is to build a small shed inside the greenhouse. This method is used in areas where the temperature drops sharply and in extremely cold areas. Its thermal insulation performance can be imagined.
The outside of the shed is covered with straw curtains or greenhouse insulation quilts. Generally, greenhouse insulation quilts are generally selected. Because the straw curtain is easy to scratch the greenhouse film, and it is known that the insulation of the greenhouse is about 1.5 times higher than that of the straw curtain.
A heater is added to the shed. The biomass pellet hot blast stove is currently popular, which is economical and environmentally friendly. Remember to prevent fire.
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