Classification of cold storage temperatures
Cold storage is usually divided into four temperatures: high temperature, medium and low temperature, low temperature, and ultra-low temperature, and the temperature required for different ingredients is different.
A. High temperature cold storage:
High temperature cold storage is what we call refrigerated preservation cold storage, the temperature is usually above 0 °C, usually used to store fruits and vegetables, eggs, medicinal materials, wood preservation, boring, etc. The insistence temperature is usually around 0°C, and the air cooler is used for blowing cooling.
B. Medium and low temperature cold storage:
Medium and low temperature cold storage is high temperature frozen cold storage, the temperature is usually within -18 °C, mainly used to store meat, aquatic commodities and commodities suitable for the temperature scale.
C. Low temperature cold storage:
Low-temperature cold storage, also known as frozen storage, frozen cold storage, usually the storage temperature is about -20 °C ~ -30 °C, through the air cooler or special freezing equipment to complete the freezing of food.
D. Ultra-low temperature cold storage:
Ultra-low temperature cold storage, ≤-30 °C cold storage, is mainly used for quick-frozen food and industrial experiments, medical treatment and other special uses, the use of the market is slightly smaller than the above three.
Calculation table of storage capacity of cold storage
Calculate the tonnage of cold storage: (calculated according to the cold storage design specifications and relevant national standards for cold storage capacity):
The internal volume of the refrigerator × the volume utilization coefficient × the unit weight of food = tonnage of cold storage.
The first step is to calculate the actual available and storage space inside the cold storage: the internal space of the cold storage - the aisle space that needs to be set aside in the warehouse, the location occupied by the internal equipment, and the space that needs to be reserved for internal air circulation;
In the second step, the weight of items that can be stored per cubic meter of space is queried according to the category of inventory items, and multiply by this to obtain how many tons of products can be stored in the cold storage;
500~1000 cubic =0.40;
1001~2000 cubic =0.50;
2001~10000 cubic meters =0.55;
10001~15000 cubic = 0.60.
Unit weight of food in active cold storage:
Frozen meat: 0.40 tons per cubic meter;
Frozen fish: 0.47 tons per cubic meter;
Fresh fruits and vegetables: 0.23 tons per cubic meter;
Machine-made ice: 0.75 tons per cubic meter;
Frozen sheep cavity: 0.25 tons per cubic meter;
Boneless and cut meat: 0.60 tons per cubic meter;
Frozen poultry in boxes: 0.55 tons per cubic meter.
Classification of cold storage plates
Cold storage plates are generally produced by manufacturers in advance, with fixed length, width and thickness, high and medium temperature cold storage generally use 10 cm thick plates, low temperature storage and freezing storage generally use 12 cm or 15 cm thick plates; Therefore, if it is not a scheduled library plate, it is necessary to pay attention to the density of the library plate and the thickness of the steel plate when purchasing, the thickness of the steel plate of the regular manufacturer is generally above 0.4MM, and the foaming density of the cold storage plate is 38KG ~ 40KG / cubic meter per cubic meter according to the national standard.
Polyurethane cold storage board rigid foam is currently recognized as the best building hot material. Its low thermal conductivity, good load resistance, high flexural strength, no water absorption, no rot, no moth bite, good flame retardancy, large temperature resistance range. Using the principle of roller barrel, the metal plate is placed on the specially designed feeding belt, and the polyurethane foaming agent is sprayed on the metal plate by the spraying device, and the foaming agent is foamed between the metal plates by high temperature treatment, and three layers of one-time integrated polyurethane (PU, PIER) color steel sandwich panels are completed.
The protection data of cold storage board mainly includes the following:
A. Embossed color steel plate;
B. Stainless steel plate;
C. Color zinc steel plate;
D. Salinized steel plate;
Cold storage plate thickness specifications: 60, 75, 100, 120, 150, 180, 200, 250; The cold storage board has a manual board and a mechanism board, the manual board is the hook version, the length is generally up to 12000mm (12 meters), the flame retardant is B2, often used in small cold storage; The mechanism plate is a spliced connection, flame retardant B1 B2, generally up to 28000mm (28 meters), commonly used in large cold storage.
