Cold chain transport monitoring - characteristics and requirements of cold storage

Cold chain transport monitoring - the characteristics and requirements of the cold storage are not only restricted by the production process, but also mainly by the temperature difference between the inside and outside of the cold storage and the pressure difference of water vapor, and the resulting temperature stress, water vapor penetration and heat transfer. Constraints. It should provide "cooling, preservation, freezing, and chilling" for perishable foods at low temperatures, and provide the necessary cold environment for maintaining the color, taste and nutritional value of foods. According to the nature of cold storage, the temperature in the warehouse is generally relatively stable - A temperature of 40°C—0°C. The interior of the cold store is often under low temperature conditions, while the outside is often in cyclical fluctuations with the change of the outdoor ambient temperature. In addition, frequent opening of the cold storage production operation results in hot and cold inside and outside the cold store. Exchanges, etc., to promote cold storage building must take appropriate technical measures to adapt to the characteristics of cold storage.



Cold chain transport monitoring - the characteristics and requirements of cold storage are as follows:



First, in order to maintain a certain low temperature in the cold storage, the walls, floors and flat tops of the cold storage are covered with a certain thickness of heat insulation material to reduce the heat transferred from outside. In order to reduce the radiant energy absorbed by the sun, the surface of the outer wall of the cold storage room is generally painted white or light color. Therefore, the cold storage building is different from the general industrial and civil buildings, and has its unique structure.



Second, cold storage buildings should prevent the spread of water vapor and air infiltration. The intrusion of outdoor air not only increases the cold spot of the cold storage, but also brings moisture to the warehouse. The condensation of moisture causes damage to the building structure, especially the thermal insulation structure, so it is necessary to install a moisture-proof and heat-insulating layer to make the cold storage building have good Sealing and moisture barrier properties.



Thirdly, the foundation of the cold storage is affected by the low temperature. The moisture in the soil is easily frozen. Because of the volume expansion after the soil freezes, it will cause ground cracking and deformation of the entire building structure, seriously making the cold storage unusable. For this reason, in addition to having an effective thermal insulation layer at the floor of the cold storage, it must be treated under the thermal insulation layer in order to prevent the freezing of the soil.



Fourth, the floor of the cold store should be piled up with a large amount of cargo, and it should be subject to various loading and unloading and transporting mechanical equipment. Therefore, its structure should be sturdy and have a large bearing capacity. In a low-temperature environment, especially during cyclic freezing and thawing cycles, the building structure is vulnerable to damage. Therefore, the building materials of the cold storage and the parts of the cold storage should have sufficient frost resistance.



In general, buildings guarantee the quality of buildings with their strict insulation, tightness, firmness and frost resistance. Choosing a suitable cold store should determine the size of the cold storage according to the tonnage of its own storage, the daily purchase volume and the size of the building, and determine the size of the storage door and the opening direction of the door.



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