The refrigerated door for cold room is access to the cold storage room. It must be responsible for the sanitation of the cold storage, the convenience of entering and leaving goods, and the evacuation in case of accidents. Therefore, the design and manufacture of refrigerated door for cold room materials should not be sloppy. The important point of the refrigerated door is to have a good heat insulation effect to ensure that the temperature of cold storage is continuously stable without large errors.
First of all, the design of the refrigerated door for cold room should consider meeting the use requirements. The cold storage door shall be set at the position convenient for goods to enter and leave the warehouse. Its size shall not only reduce the loss of cooling capacity when the door is opened but also adapt to the needs of transportation and stacking tools according to the user requirements.
The refrigerator door shall be closed tightly, opened flexibly, with firm structure and small deformation; the mechanical strength shall be the same and the rigidity shall be good. To reduce the weight of the door leaf, the refrigerated door for cold room should be made of the structural material with smaller volume weight and the heat insulation and steam insulation material. For example, the use of polystyrene foam as a thermal insulation layer, the refrigerated door for cold room with plastic film as the insulation layer, the weight of the refrigerated door is much less than that of the cork insulation layer, and the asphalt coating is used as the insulation layer.
The refrigerated door for cold room is a part of the enclosure structure of the warehouse, and its main function is for people and goods to enter and leave the warehouse. The main difference between the cold storage door and the common door is that it must be insulated, which is equivalent to the heat insulation structure that can be opened and closed. The design and management of the cold storage door is directly related to the service life of the whole cold storage and the quality of the cold storage goods.
To reduce the influence of the temperature and humidity of the air outside the warehouse on the inside of the warehouse. The refrigerated door for cold room shall have certain heat insulation performance (generally similar to the heat insulation performance of the attached enclosure). Therefore, the door leaf of the cold storage door shall be provided with a sufficient thickness of the heat insulation layer, and the corresponding steam insulation layer shall be provided to prevent the heat insulation layer from failure due to moisture.
At present, polystyrene foam or cork is commonly used as insulation materials for cold storage doors, and plastic film or hot asphalt is adopted as the insulation layer. To reduce the heat transfer of the cold storage door, the door leaf and the door frame of the cold storage door shall have enough lap width, and the door leaf shall have good sealing when it is closed.
In the design of the door frame of the cold storage door, attention must also be paid to avoid the formation of a "cold bridge" cold storage door, and safety requirements shall be considered. To facilitate the personnel in the warehouse to leave the warehouse quickly in case of an accident, the warehouse door shall be opened externally, and the closed warehouse door must be able to be opened from the warehouse. The electric door must be equipped with a manual device, and an alarm device shall be installed in the warehouse.
The cold storage door is the throat for goods entering and leaving the warehouse, which is opened frequently. When the door is opened, the hot and cold air inside and outside the warehouse exchanges hot and cold air near the door opening
The wall, floor, and ceiling around the door opening are prone to condensation, dripping, frosting and icing, which will cause the heat insulation materials of the enclosure to be damped and reduce the heat insulation efficiency, shorten the service life of the refrigerator, and affect the safe operation of the warehouse workers.