The air-cooled unit is the preferred form of small-scale cold storage, which has the advantages of simple, compact, easy installation, convenient operation, less auxiliary equipment and so on. Generally, the color steel plate is used as the panel, and the rigid polyurethane foam is used as the thermal insulation material. The storehouse has the characteristics of good rigidity, high strength, good heat insulation performance, and flame retardance. In general, the small-scale cold storage adopts eccentric hook connection of embedded parts in the plate wall or field foaming fixation, with good sealing, convenient installation, removal and handling, a small amount of field construction and installation, labor-saving, good quality, and quick effect. It can meet the needs for different purposes and is suitable for various industries and departments.
Cold storage, generally refers to facilities that use various equipment to cool, control and maintain stable low temperatures. Its basic components are refrigeration system; electric control device; storehouse with certain thermal insulation performance; attached buildings, etc. The refrigeration system mainly includes all kinds of refrigeration equipment. The refrigeration equipment is the heart of the cold storage, which makes the cooling capacity and ensures the supply of cold source in the warehouse. The electronic control device is the brain of the cold storage, which commands the refrigeration system to ensure the supply of cooling capacity. The storehouse with certain heat insulation performance is the place for storing fresh agricultural products. Its function is to keep the stability of low-temperature environment. Generally speaking, the heat insulation performance is called heat preservation. The good heat insulation structure of the warehouse can keep the cooling capacity of the refrigeration equipment manufacturers in the warehouse to the maximum extent and leak out less. On the contrary, it is to minimize the heat leakage out of the warehouse to the warehouse, which is also the main difference between the cold warehouse and the general house.
Small refrigerators are generally divided into the indoor type and outdoor type
1. Ambient temperature and humidity outside the refrigerator: temperature is + 35 ℃; relative humidity is 80%.
2. Set temperature in cold storage: fresh-keeping cold storage: + 5 ~ – 5 ℃; cold storage: – 5 ~ – 20 ℃; low temperature cold storage: – 25 ℃
3. The temperature of food entering the cold storage: l level cold storage: + 30 ℃; D level and j level cold storage: + 15 ℃.
4. The effective storage volume of the assembled cold storage is about 69% of the nominal volume, which is multiplied by a correction factor of 0.8 when storing fruits and vegetables.
5. The daily purchase quantity is 8-10% of the effective volume of the cold storage.
Key design points of a small refrigerator
If the temperature of the cold storage is below 0 ℃ (- 16 ℃), 10 channel steel shall be set on the ground (under the storage plate) for overhead, so as to make it naturally ventilated. Small cold storage, the temperature in the cold storage is 5 ~ – 25 ℃, the cold storage plate can directly contact with the ground, but the ground should be flat. If high points are required, wooden strips can be placed under the cold storage to enhance ventilation; channel steel can also be placed under the cold storage to enhance ventilation.
Small refrigerator installation
The lapping of the wall panel and the top plate, the reinforcement of the wall panel and the steel frame, and the hoisting of the ceiling panel and the frame are all equipped with special combined accessories and special forms to ensure the airtight, firm and safe insulation of the cold storage. High strength locks are embedded around each precast slab, which is very convenient for assembly.