First,Cold storage site selection and preparation
According to the using properties，the cold storage can be divided into three categories， the distributive cold storage, retail nature of cold storage and production of cold storage.Productive cold storage was built near the source relatively concentrated,which also need to consider the convenient transportation, market contact, and other factors. Cold store built in the absence of sunlight and shade of hot air frequently as well, small refrigerator the best built in the interior. Cold storage should have good drainage conditions, lower groundwater level, preferably insulating layers under the cold storage, and maintaining a good ventilation, dry cold storage is very important.Cold storage construction should follow the freezer before three-phase electric power set up well in advance of the appropriate capacity, if the refrigerator is water cooled, water pipe should be well laid and build the good cooling tower.
Second, Determination of warehouse capacity.
Cold storage size depending of the highest amount of agricultural products. This capacity is according to the storage products in cold storage pile up in the volume of the necessary to occupy, plus multiple corridor, with wall, ceiling of the space between and space etc packing the calculated. After suring the cold storage capacity , then determine the length and height of the cold storage. Freezer design even consider the ancillary buildings and facilities, such as workshop, packing arrangement between the library and the loading and unloading machine tools, etc.
Third,Heat preservation material selection and installation.
The section of heat preservation material must adjust to local conditions,it not only have the good heat insulation, but also economic and practical. Cold storage heat insulation materials points several types, one is processed into fixed shape and size plate, have the fixed length, width and thickness, which based on the need of library body installation, choose relevant specification, high temperature, cold storage is generally selected 10 cm thick library board,low temperature cold storage and freezing cold storage general choose 12 cm or 15 cm of library board. Another kind of cold storage can use polyurethane spraying foam, print directly into the material of brick or concrete cold storage warehouse. After setting,it is both moisture and heat. Heat insulation materials have polyurethane, polystyrene fat, etc. Polyurethane is not bibulous, better stayed, but the cost is higher.While polystyrene fat has strong water imbibition, bad stayed, and the cost is low. The structure of the modern refrigerator is fabricated the cold storage development, including moistureproof layer and thermal insulation layer of the cold storage components.The point is: easy assembly, fast, and can be moved, but the cost is high.
Fourth, Selection of cooling system.
Cold storage cooling system is the choice of refrigerator compressor and evaporator selection.Generally,small refrigerator choose the closed compressor because closed compressor power is small and relatively cheap, Medium-sized cold storage generally choose insemi-closed compressor,the large cold storage use the semi-hermetic compressors.In selection, ammonia refrigeration compressor may also be considered. Because ammonia refrigeration compressor has the big power and has multi-function,and cold storage setup and management are more cumbersome. In the evaporator choose, high temperature cold storage choose the cooling fan for evaporator, Which is characterized by the cooling speed, but could easily lead to the loss of water of refrigerated goods. Low temperature cold storage mainly use seamless steel tubes produced by the evaporator coils, which is characterized by a temperature effect,and the timely storage.
