In recent years, cold storage facilities for truck refrigeration units have been gradually established, and related refrigeration technologies have also received much attention. The preservation of frozen and refrigerated foods depends on the temperature control of the cold storage, refrigeration base, and truck refrigeration unit. As an infrastructure in the cold chain industry, temperature control of cold storage is critical. Under normal circumstances, how much is the temperature of the cold storage should be controlled?
Generally, when constructing the cold storage of truck refrigeration unit, the best recommendation is that the thickness of the cold storage wall is 100 mm, the thickness of the insulated wall is 120 mm, the load density is 250kg/m3, the cargo storage rate is 10%, and the ambient temperature is 35 degrees Celsius. The highest cargo entry temperature, refrigerated items 25 ° C, frozen items -35 ° C, cargo specific heat, refrigerated items 0.77kJ / kg ° C, frozen items 0.44kJ / kg ° C. Compressor running time, 18 hours a day.
In addition, according to the role of the cold storage, it can be divided into fresh storage, quick-freezing, low-temperature storage, and frozen storage. The specific control is as follows:
1, fresh storage
The temperature of the reservoir is generally from 0 ° C to 5 ° C. 0 ° C ~ 5 ° C is mainly used for preservation of fresh meat, dairy products, fresh eggs, fruits and vegetables, so that the food is in a lower temperature environment, and the temperature is not lower than 0 ° C, in this environment, food can be as much as possible Keep it fresh.
2, frozen library
The temperature of the reservoir is generally below -30 °C. -30 °C is mainly used for quick freezing of food, such as quick-frozen meat, quick-frozen dumplings, quick-frozen vegetables, etc., and it is required to freeze the food quickly within a limited time.
3, low temperature library
The temperature of the reservoir is generally -22 ° C ~ -25 ° C. -22 ° C ~ -25 ° C is mainly used for food storage when the temperature is -22 ° C ~ -25 ° C. Only under this temperature condition will the food not deteriorate. For example, when the ice cream is stored at a temperature higher than -25 ° C, the fragrance disappears, and if the seafood is higher than the temperature, the taste is lost.
4, frozen refrigerator
The temperature of the reservoir is generally -15 ° C ~ -18 ° C. -15 ° C ~ -18 ° C is mainly used for food refrigeration. Some foods are put into the cold storage from time to time, and at the same time, another part of the food is taken out of the cold storage from time to time. There is no specific requirement for the refrigeration time of the food, and the storage temperature is kept in the range of -15 °C ~ -18 °C.
