Glass greenhouse is a greenhouse with the main light transmittance material, which belongs to a greenhouse. Long service life is suitable for a variety of regions and climate, and it is divided into different greenhouses to plant different plants.
In most parts of my country, the summer is hot, the temperature is high, and the outdoor temperature is above 30 ° C. The temperature inside the greenhouse exceeds 40 ° C. If only ventilation, the temperature owner indoor in the greenhouse is still above 35 ° C, and normal production cannot be performed in the greenhouse. It is necessary to use other cooling methods to reduce the indoor temperature. The greenhouse cooling methods applied in production are mainly:
1. The shading and cooling is the use of the material with the obsession or the low light transmittance of the light to prevent the light from entering the greenhouse to prevent the excess solar from entering the greenhouse to ensure that the crops can grow normally and reduce the temperature of the greenhouse. Due to the differences and differences in the installation method, the temperature of the greenhouse can generally reduce the temperature of 3 ° C to 10 ° C. The shading method has indoor shading and outdoor shading. The indoor shading system is a supporting system made by the greenhouse skeleton to pull the metal line or plastic network cable, and the shading net is installed on the membrane line. Electric control or manual control is generally used. The outdoor shading system is installed with a shaded skeleton outside the greenhouse skeleton, and the shading net is installed on the skeleton. The shading net can be driven by the curtain mechanism or curling mechanism to open and close freely. Outside the net outdoor installation of the cooling effect is good, and the solar energy can be used directly to the warm indoor. Various types of shading nets can be used.
2. Evaporation and cooling Evaporation and cooling are the use of the unsaturated air and the evaporation of water to cool down. When the water contained in the air does not reach saturation, the water will evaporate into water vapor into the air. While the water evaporates, absorb the heat in the air, reduce the temperature of the air, and increase the air humidity. During the process of evaporation and cooling, the air flow in the greenhouse must be ensured, and the high temperature and high humidity of the greenhouse are discharged from the greenhouse, and fresh air is supplemented. Therefore, the method of mandatory ventilation is needed. The method of evaporating and cooling has a wet curtain -the wind turbine to cool down and spray the cooling.
3. The roof spray cooling system is sprayed evenly on the roof of the glass greenhouse evenly to reduce the temperature of the greenhouse. When the water flows on the glass greenhouse roof, the glass of the water and the greenhouse roof is changed to take away the heat in the greenhouse. In addition, when the thickness of the water film is greater than 0.2 mm, the energy of the solar radiation is absorbed and brought by the water film and brought with Go, this is equivalent to shading.
