Why is it so hot inside the greenhouse?
For solar radiation, plastic greenhouses and glass are almost transparent, and solar radiation can enter most of them. However, for ground long-wave radiation, plastic greenhouses and glass are opaque. In this way, greenhouses and greenhouses allow the external solar energy to continuously enter the room, while the indoor heat is rarely dissipated, thus regulating the temperature. .
Due to the high price of off-season vegetables, relatively considerable profits, and the growing maturity of outdoor picking, greenhouses are widely used. Even in cold winters, the greenhouses are very warm. Everyone should not only wonder why the temperature in the greenhouses is so high, and the greenhouses are very warm. What is the principle of insulation of greenhouses, let's take everyone to understand.
Plastic greenhouses and glass are almost "transparent" to solar radiation, allowing most of the solar radiation to enter. But for ground long-wave radiation, plastic greenhouses and glass are not "transparent", and long-wave radiation is rarely transmitted. In this way, the greenhouses and greenhouses allow the external solar energy to continuously enter the room, while the indoor heat is rarely dissipated, thus playing a role in regulating the temperature.
Therefore, the sun shines into the greenhouse through the film, and the temperature is firmly locked by the film, so the temperature is relatively high. The surface itself also has temperature. Due to the blocking of the film, the cold air outside cannot enter, and it cannot contact the indoor air so that the temperature will not drop. The function of the film is to only let in the sunlight and not the air, so the indoor temperature is higher than The outside temperature is much higher.
With the maturity of greenhouse technology in recent years, the types of greenhouses are increasing, and the functions are beginning to be refined. According to the functions, there are ornamental greenhouses, amusement greenhouses, catering greenhouses, experimental greenhouses, etc. Of course, the most important thing is to use it for Greenhouses for vegetable cultivation, let's take a look at what kinds of greenhouses are classified by material?
1. Glass greenhouse
Why is the temperature in the greenhouse high, the principle of greenhouse insulation
Most of its covering materials are mainly transparent glass, and its light transmittance is very good, even reaching 70%. The skeleton is generally made of galvanized steel pipe or aluminum alloy light steel, and the cost is high. Maintenance is very inconvenient, and economic benefits cannot be effectively guaranteed.
2. Plastic greenhouse
Why is the temperature in the greenhouse high, the principle of greenhouse insulation
It is widely used in southern my country, mainly for horticultural facilities. The plastic greenhouse is made of plastic film as the covering material. Most of it is made of cement and steel mixed columns as the skeleton. It is a single-span arch without heating. Roof greenhouse, its main function is to keep warm in winter and shade in summer.
