Four major issues to be considered in the cold storage design process

Four major issues to be considered in the cold storage design process

1. Cold storage volume

　　The size of the cold storage should be calculated based on the volume that the stored products must occupy in the cold storage, plus the aisles between rows, the space between the stack and the wall, ceiling, and the gap between the packaging. After determining the capacity, determine the length and height of the cold storage. The cold storage design must also consider the necessary auxiliary buildings and facilities, such as workshops, packing and sorting rooms, tool storage and loading docks, etc., so that the quality of the cold storage can be guaranteed.

　　2, the choice of insulation material is very important to the quality of cold storage

　　The selection of heat insulation materials for cold storage must be adapted to local conditions. It must have good heat insulation performance and be economical and practical. There are several types of thermal insulation materials. One is processed into a plate with a fixed shape and specification, with a fixed length, width and thickness. The plate of the corresponding specification can be selected according to the installation needs of the cold storage body. The high and medium temperature cold storage generally choose 10cm Thick slabs, low-temperature cold storages and freezing cold storages generally use 12cm or 15cm thick slabs; the other can be sprayed and foamed with polyurethane, and the material can be sprayed directly into the built brick or concrete warehouse, which is moisture-proof and Insulation. The thermal insulation materials include polyurethane and polyphenylene resin. Polyurethane does not absorb water and has better heat insulation, but the cost is higher; Polyphenyl has strong water absorption and poor heat insulation, but the cost is lower. The structure of modern cold storage is developing towards assembly type, and it is made into the structure of the storage body including the moisture-proof layer and the heat-insulating layer. It can be assembled on-site. The advantage is that the construction is convenient, fast, and movable, but the cost is relatively high.

　　3. The choice of refrigeration system is important to the quality of cold storage. The choice of cold storage refrigeration system is mainly the selection of compressor and evaporator. The refrigeration system is the core of the cold storage. It is mainly composed of four parts: compression system, condensing system, evaporation system and regulating valve. In addition, there are fans, ducts and instruments, etc. Accessories. The entire refrigeration system is a sealed circulation loop, the refrigerant circulates in the sealed system, and the supply and the number of times it enters the evaporator is controlled as required to obtain suitable low temperature conditions. The compressor is the heart of the refrigeration system. It pushes the refrigerant to circulate in the system. The function of the condenser is to remove the heat in the compressed gaseous refrigerant and condense it into a liquid refrigerant; the cooling methods of the condenser include air cooling, water cooling, and a combination of air and water. Air cooling is limited to small cold storage. Application in refrigeration equipment. The role of the evaporator is to provide cold energy to the cold storage. The evaporator is installed in the cold storage, and the blower is used to blow the cooled air to all parts of the storage. The common air duct of the large cold storage is connected to the evaporator to extend the air supply distance and make the storage The temperature drop is more even.

　　 4. Under normal circumstances, small-scale cold storages use hermetic compressors as the main choice

Because of the low power of hermetic compressors, the price is relatively cheap; medium-sized cold storages generally use semi-hermetic compressors; large-scale cold storages use semi-hermetic compressors. When choosing, you can also consider using ammonia refrigeration compressors because of the power of ammonia refrigeration compressors. It is large and can be used in one machine, but installation and management are more cumbersome. In the selection of cold storage evaporator, the high temperature cold storage uses air cooler as the evaporator, which is characterized by fast cooling speed, but it is easy to cause moisture loss in the refrigerated products; medium and low temperature cold storage mainly use evaporating pipes made of seamless steel pipes. It is characterized by a good constant temperature effect and can store cold in a timely manner. ,