Selection of cold storage electrical control system and other design considerations

Selection of cold storage electrical control system and other design considerations

The refrigeration electrical control system is a necessary condition to ensure that the cold storage always automatically works within the set range. Its main work flow includes:

　　When the compressor works: the cold storage reaches the set temperature, and the compressor stops working. When the storage temperature rises to the set temperature, the compressor restarts to start refrigeration.

Automatic defrosting: Generally, the defrosting heating action is automatically started for about 6 hours. There are two control parameters for defrosting, one is time and the other is temperature. When one of the two conditions is reached, the defrosting process ends, and it takes 2 minutes after the end. Refrigerate after about the dripping time to make the temperature of the cold storage reach the required temperature as soon as possible. The cold storage design chooses Kuhua Refrigeration.

　　Alarm function: A warning is issued when the temperature library exceeds the set requirements, so that it can be processed in time to ensure food safety.

　　Safety requirements: The overall environment of the cold storage is relatively humid, and its surface is made of metal materials, which is prone to leakage. Therefore, the built-in electrical appliances in the cold storage body can use low-voltage equipment, such as lights, anti-condensation heating wires, etc.

Drainage: In the current design of small cold storage, air cooling is the main method (more and more cold storages are also water-cooled). The air cooler needs to be defrosted regularly to increase the heat exchange efficiency. Each cold storage should independently reserve a drainage position , Generally a PVC drainage pipe with a diameter of 50 is enough, located near the outside of the cold storage near the air cooler.

Exhaust air: Because small cold storage is generally installed indoors, the compressor matching is relatively small, considering the cooling loss, the compressor is generally near the cold storage, so the heat discharged by the cold storage may be in a certain narrow space, and exhaust air should be considered at this time , To ensure the proper condensing temperature of the compressor unit. The exhaust air volume should not be less than the exhaust air volume of the condenser of the compressor unit. Moisture-proof: The surface forming base plate of the cold storage is made of aluminum, color steel or galvanized sheet, and the cold storage is relatively humid due to the long-term low temperature, so it should be moisture-proof, especially the insulation material must not enter water, otherwise the insulation effect will not be good.