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Glass greenhouse refers to the greenhouse with hot-dip galvanized steel framework and glass as the lighting material. The top and surrounding of the greenhouse are dedicated aluminum profiles. In cultivation facilities, the glass greenhouse is the longest service life form and is suitable for a variety of regions. And use under various climatic conditions. This type of greenhouse can realize fully automatic control, supporting facilities are optional, external shading system, internal shading system, fan water curtain cooling system, top opening window ventilation system, fill light system, seedbed nursery system, spray system, computer control system, etc.

1. Understand what is the thermal insulation effect of the atmosphere? (The earth ’s atmosphere is almost transparent to the short-wave radiation of the sun. Most of the solar radiation can be transmitted to the ground through the atmosphere to warm the ground; the long-wave radiation of the atmosphere to the ground is an insulation layer Most of the heat radiated from the ground is trapped in the atmosphere, and the heat is returned to the ground through atmospheric reverse radiation. People call this effect of the atmosphere, called the atmosphere insulation effect.) Therefore, the increase of carbon dioxide will strengthen the atmosphere. "Greenhouse effect." (The carbon dioxide increases, the atmosphere's ability to absorb ground long-wave radiation is enhanced, and the temperature of the atmosphere is increased; the atmosphere's ability to reverse radiation is enhanced, and the heat lost from the ground is also increased)

2. How to understand the greenhouse effect of glass greenhouse? The effect of glass is similar to the thermal insulation effect of carbon dioxide. Solar short-wave radiation can heat up indoors through glass and plastic greenhouses, and the ground radiation emitted after the indoor floor warms up is blocked by glass or plastic greenhouses, reducing heat loss. At the same time, glass also prevents indoor (warm) and outdoor (cold) air from exchanging heat by convection or turbulence, making the temperature inside the greenhouse higher than outdoors.

3. What are the beneficial effects of greenhouse technology on light, heat, and water conditions in agricultural production in the north? (① The sunlight in winter is fully utilized; ② Increase the temperature in the greenhouse to reduce the impact of low temperature freezing damage on agriculture in winter, so that crops can be used in winter. Can also be planted; ③ helps to maintain and regulate the moisture of air and soil in the greenhouse.)

    Before the beginning of the 20th century, people had mistakenly thought that the thermal insulation mechanism of glass greenhouses (flower growing rooms without artificial heating) was the same as the thermal insulation mechanism of the atmosphere, so it was called the "greenhouse effect". In 1909, the American physicist Wood made greenhouse (flower room) experiments with rock salt (transparent to both long and short wave radiation and not retaining long wave radiation) and glass (with the ability to intercept long wave radiation through short wave radiation). The temperature in the greenhouse is as high. This shows that the thermal insulation effect of the greenhouse is not mainly whether to block or absorb long-wave radiation, but that its glass or rock salt wall prevents the indoor (warm) and outdoor (cold) air from exchanging heat by convection or turbulence. According to research, this effect of preventing air from exchanging heat indoors and outdoors is 3-4 times greater than the effect of atmospheric insulation gases on long-wave radiation absorption.