1. The general cold storage is mostly cooled by the refrigeration machine, and the liquid (ammonia or Freon) with a very low gasification temperature is used as the coolant, so that it evaporates under low pressure and mechanical control conditions to absorb the heat in the storage warehouse, so as to achieve the purpose of cooling and cooling.
The most commonly used is the compression refrigerator, which is mainly composed of compressor, condenser and evaporation tube. According to the way of the evaporation tube device, it can be divided into two types: direct cooling and indirect cooling.
Direct cooling The evaporation tube is installed in the cold storage room, and when the liquid coolant passes through the low-pressure evaporation tube, it directly absorbs the heat in the warehouse and cools down. Indirect cooling is caused by a blower to suck the air in the warehouse into the air cooling device, and the air is hovered in the evaporation tube in the cooling device to absorb heat, and then sent into the warehouse to cool down.
The advantages of the air cooling method are rapid cooling, the temperature in the warehouse is relatively uniform, and at the same time, harmful gases such as carbon dioxide produced during the storage process can be taken out of the warehouse. 2. Small cold storage generally uses spray color steel plate as panel, rigid polyurethane foam or high-density polystyrene as insulation material, the library body has good rigidity, high strength, good thermal insulation performance, flame retardant and other characteristics.
The small cold storage body generally adopts the eccentric hook connection of the embedded parts inside the board wall or on-site foaming and solidification, which has good sealing and easy installation, easy installation, disassembly and handling, small amount of on-site construction and installation engineering, labor-saving, good quality and fast results. The small cold storage is equipped with advanced refrigeration unit, the storage capacity and the refrigeration equipment are fully matched, the cooling speed is fast, the power saving and energy saving, and all automatic operation, safe and reliable operation.
Small assembled cold storage is widely used, cold storage temperature range 5 °C--23 °C, special assembly cold storage can reach -30 °C below, can meet the needs of different uses, suitable for various industries and departments. 3. Small cold storage is generally divided into two types: indoor type and outdoor type1. Ambient temperature and humidity outside the cold storage: the temperature is 35°C; The relative humidity is 80%.
2. Set temperature in cold storage: fresh-keeping cold storage: 5~-5°C; Refrigerated cold storage: -5~-20°C; Low temperature cold storage: -25°C3. Food temperature in cold storage: L-level cold storage: 30°C; Class D, Class J cold storage: 15°C. 4. The effective volume of stacking of prefabricated cold storage is about 69% of the nominal volume, and the correction factor of 0.8 is multiplied by 0.8 when storing fruits and vegetables.
5. The daily purchase volume is 8~10% of the effective volume of the cold storage.
