Glass greenhouse is a type of greenhouse that uses glass as the main transparent covering material. Long service life, suitable for various regions and climates, divided into different greenhouses for planting different plants.

In most parts of China, summer is hot and the temperature is high. When the outdoor temperature is above 30 ℃, the temperature inside the greenhouse exceeds 40 ℃. If only ventilation is used, the temperature inside the greenhouse will still be above 35 ℃, and normal production cannot be carried out inside the greenhouse. Other cooling methods need to be used in conjunction to reduce the indoor temperature. The main greenhouse cooling methods used in daily production include:

1. Shade cooling is the use of opaque or low transmittance materials to shade and reduce light, preventing excess solar radiation from entering the greenhouse, ensuring normal crop growth, and reducing greenhouse temperature. Due to differences in shading materials and installation methods, greenhouse temperatures can generally be reduced by 3 ℃ to 10 ℃. The shading methods include indoor shading and outdoor shading. The indoor shading system is a support system made by connecting metal wires or plastic mesh wires to the greenhouse frame, and installing the shading net on the support film line. Generally, electric control or manual control is used. The outdoor shading system is to install a shading framework outside the greenhouse framework, and install a shading net on the framework. The shading net can be driven by a curtain pulling mechanism or a film rolling mechanism to open and close freely. The installation of sunshade nets outdoors has a good cooling effect, which can directly block solar energy outside the greenhouse. Various types of sunshade nets can be used.

2. Evaporative cooling is the use of the unsaturation of air and the latent heat of evaporation of water to cool down. When the moisture in the air has not reached saturation, it evaporates into water vapor and enters the air. While the water evaporates, it absorbs heat from the air, lowers its temperature, and increases its humidity. During the process of evaporative cooling, it is necessary to ensure the flow of air inside and outside the greenhouse, to remove high temperature and high humidity gases from the greenhouse, and to supplement fresh air. Therefore, forced ventilation is required. Evaporation cooling methods include wet curtain fan cooling and spray cooling.

3. The roof sprinkler cooling system evenly sprays water onto the roof of a glass greenhouse to reduce the temperature of the greenhouse. When water flows on the roof of a glass greenhouse, it exchanges heat with the glass on the greenhouse roof, taking away the heat inside the greenhouse. In addition, when the thickness of the water film is greater than 0 At 2 millimeters, all the energy radiated by the sun is absorbed and carried away by the water film, which is equivalent to shading.