Greenhouses reduce heat loss from cold bridges
The greenhouse reduces the heat loss of the cold bridge In the greenhouse structure, due to the needs of structure and installation equipment, the envelope structure of the greenhouse is often composed of a variety of materials.
In addition to the large-area lighting covering materials, the envelope structure of the smart greenhouse also includes bottom brick walls, concrete ring beams, metal columns on the outer walls, plastic or alloy skeleton systems supporting external lighting covering materials, roof skeleton systems, etc.
Due to the different types of these materials, their thermal conductivity and thermal insulation properties are also different. Materials with relatively high thermal conductivity can easily conduct heat. We usually refer to the parts with low thermal insulation performance as "cold bridges". The cold bridge is not only the main channel for heat conduction, but also the place where condensed water is easily generated, and they are the weak link of thermal insulation.
Therefore, taking measures to reduce the heat loss of the cold bridge is also an important means of energy saving and heat preservation.
To reduce the heat loss of the cold bridge, one is to try to block the passage of the cold bridge, and the other is to take special thermal insulation structural measures at the cold bridge.
In the design of the greenhouse, attention should be paid to the insulation of the gutter, the insulation of the foundation and the insulation of the external holes. The greenhouse gutter has the function of connecting the roof and collecting rainwater and drainage. Most of the gutters are made of steel or alloy, which has poor thermal insulation performance and large heat loss. Relevant studies have shown that the gutter occupies less than 5 percent of the greenhouse area, but the heat loss exceeds 9 percent . Therefore, the impact of the thermal insulation effect of the greenhouse gutter on the energy saving of the greenhouse cannot be ignored.
