Three factors determine the quality of cold storage

Three factors determine the quality of cold storage 　 1. Volume of cold storage space The size of the cold storage should be designed according to the highest amount of agricultural products to be stored throughout the year. This capacity is calculated based on the volume that the stored products must occupy in the cold storage, plus the aisles between the rows, the space between the stack and the wall and ceiling, and the gap between the packaging. After determining the capacity, determine the length and height of the cold storage. The design of the cold storage must also consider the necessary auxiliary buildings and facilities, such as working rooms, packaging and finishing rooms, tool storage and loading and unloading stations, etc., so that the quality of the cold storage can be guaranteed. 2. The choice of insulation material and the relationship between the laying and the cold storage 　Choice of insulation materials for cold storage must be adapted to local conditions. It must have good heat insulation performance and be economic and practical. There are several types of heat insulation materials. One is processed into plates of fixed shape and specifications, with fixed length, width and thickness. The plates of corresponding specifications can be selected according to the needs of cold storage body installation. Generally, high and medium temperature cold storages are selected for 10 Centimeter-thick slabs, low-temperature cold storage and frozen cold storage generally use 12-cm or 15-cm-thick plates; another type can use polyurethane spray foam to spray the material directly into the built brick or concrete warehouse, after setting Both moisture-proof and thermal insulation. Insulation materials include polyurethane and polystyrene. Polyurethane does not absorb water and has good thermal insulation, but the cost is high; Polystyrene has strong water absorption and poor thermal insulation, but the cost is low. The structure of the modern cold storage is developing towards the assembly type. The components of the storage body including the moisture-proof layer and the heat-insulating layer are 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 also extremely important for the quality of the cold storage 　The choice of cold storage refrigeration system is mainly the choice of compressor and evaporator. 　Refrigeration system is the core of the cold storage, which is mainly composed of four parts: compression system, condensation system, evaporation system and regulating valve. In addition, there are accessories such as fans, ducts and instruments. The entire refrigeration system is a sealed circulation circuit, the refrigerant circulates in the sealed system, and the supply quantity and the number of times of entering the evaporator are controlled as required to obtain suitable low temperature conditions. The compressor is the heart of the refrigeration system. It drives 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 are air cooling, water cooling, and air and water. Air cooling is limited to small cold storage Application in refrigeration equipment. The function of the evaporator is to provide cooling capacity to the cold storage. The evaporator is installed in the cold storage, and the blower is used to blow the cooled air to various parts in the storage. The temperature drop is more uniform. Under normal circumstances, the small cold storage mainly uses fully enclosed compressors. Due to the small power of the fully enclosed compressor, the price is relatively cheap; semi-closed compressors are generally used for medium-sized refrigerators; semi-closed compressors are used for large refrigerators. When selecting, ammonia refrigeration compressors may also be considered, because the power of ammonia refrigeration compressors It is large and can be used in one machine, but the installation and management are more cumbersome. In the selection of the evaporator of the cold storage, the high-temperature cold storage uses the cooler as the evaporator, which is characterized by the rapid cooling speed, but it is easy to cause the loss of moisture in the cold storage; the medium and low temperature cold storage is mainly made of evaporative exhaust pipes made of seamless steel tubes It is characterized by good constant temperature effect and can store cold in time