Cold storage equipment manufacturers discuss how to prevent moisture and insulate cold storage
Cold storage buildings are different from general industrial and civil buildings. Due to its special low-temperature storage purpose, the cold storage building not only needs to ensure the low-temperature environment in the cold storage, but also needs to solve the problem of keeping the shell structure insulated and moisture-proof. For some special cold storages, such as air-conditioned warehouses, air tightness issues need to be solved. In addition, the ambient temperature and humidity of the cold storage also change, but the internal environment of the cold storage needs to remain unchanged. Therefore, in the design and construction of cold storage, it is necessary to solve the problem of alternating hot and cold conditions in the cold storage. Next, the cold storage installation project will introduce you to the characteristics of cold storage buildings. In other words, how should cold storage be isolated from water and steam?
1. Cold storage installation project
Cold storage is both a warehouse and a factory.
The cold storage is a warehouse, which transports goods quickly and easily; the cold storage is also a factory, mainly engaged in low-temperature production. Therefore, the building structure of the cold storage must be able to meet the requirements of low-temperature production processes.
2. Insulation and cold-proof bridge
Insulation plays an important role in keeping the temperature of cold storage stable, reducing the heat load of cold storage, saving energy, and ensuring the quality of food storage. Therefore, the walls, floors and roofs of cold storage should be insulated. In addition, the cold storage should have a certain strength, and its floors and floors should have a large load-bearing capacity. The insulation should avoid "cold bridges" and have long-lasting insulation properties. The inner wall of the cold storage insulation layer is equipped with a protective layer to prevent damage to the insulation material during loading and unloading.
3. Moisture-proof and steam-proof
For example, due to the large temperature difference between the air inside and outside the refrigerator compartment, a water vapor pressure difference is formed corresponding to the temperature difference, and then the water vapor penetrates from the high-temperature side to the low-pressure refrigerator compartment through the shell structure. When water vapor enters the shell and reaches a certain temperature lower than the air dew point temperature, the water vapor condenses into water or ice, causing the insulation structure to be identified and the insulation performance to decrease. Therefore, on both sides of the refrigeration structure, when the design temperature difference is equal to or greater than 5°C, moisture-proof measures should be taken, or a moisture-proof layer should be installed on the high temperature side.
4. Doors, windows and holes
In order to reduce the impact of temperature and humidity changes inside and outside the warehouse, cold storage generally does not open windows. Open as few holes as possible, and open as many holes as possible for production process, water, electricity and other equipment pipes. The door is a necessary passage for goods to enter and leave the warehouse, and the single room is also an important place for air heat and moisture exchange inside and outside the warehouse. Due to heat and moisture exchange, condensation and frost will occur around the door, and repeated freezing and thawing can damage building materials near the door. Therefore, in normal use, the number of doors should be as small as possible. Also, take steps around the door such as adding air screens and wires.
5. Reduce heat radiation
In order to reduce the impact of solar radiation, the surface of the cold storage should be shallow, smooth, and smooth, and try to avoid large areas of sunlight. Corresponding measures can be taken on the floor, such as adding a ventilation layer and directly reducing the impact of solar radiation heat on warehouse temperature through the roof.
6. The floor is protected from frost heaving.
Civilian cold storage buildings are built on the ground. Groundwater vapor can penetrate the cold storage foundation due to heat flow created by the temperature gradient between depth and foundation surface. When the temperature of the cold storage floor drops below 0°C, it will cause the floor to freeze and damage the cold storage floor. Anti-freezing measures such as elevated floors, buried ventilation ducts or preheated floors should be taken on the cold storage floor.