College】 【weak main factors determine the quality of cold】..

<br> 1, cold storage warehouse capacity; refrigerator the size of the storage of agricultural products according to the maximum annual amount to be designed. .This capacity is based on stacking storage products in cold storage volume required to take, plus inter-row aisle, stack the wall, the space between the ceiling and the packaging so that the gap between the calculated. .Determine the capacity of the latter, and then determine the length of cold storage and height. .Cold storage design must also consider the necessary ancillary buildings and facilities, such as workstations, packaging finishing, the tool library and the loading platform, etc., so cold storage quality can be guaranteed. .2, insulation materials, the quality selection and installation of cold storage is very important; cold insulation materials used must be adapted to local conditions, we must have good insulation properties, but also economical and practical. .Several types of insulation material points, one is processed into a fixed shape and size of the plate, a fixed length, width and thickness, can be installed according to the needs of cold storage library to select the appropriate body size of the plate, high temperature and cold storage is generally used in the 10 .cm thick library boards, cold storage and freezing cold generally use 12 cm or 15 cm thick plate; the other can use polyurethane spray foam, spray directly into the material has been built of brick or concrete warehouse, after setting .both moisture and heat. .Plates with polyurethane insulation material, polystyrene resin and so on. .Polyurethane does not absorb water, better insulation, but the cost is high; polystyrene resin absorbent, insulation is poor, but the cost is low. .The structure of modern cold storage fabricated positive development, including the vapor barrier and insulation made of layers of the library body components, to achieve site assembly, the advantage of easy construction, fast, and can move, but the cost is high. .<BR> 3, the choice of cold storage refrigeration systems quality is most important. .The selection of cold storage refrigeration system is the selection of the compressor and evaporator. .Cold storage refrigeration system is the core, mainly by compression system, condensing system, evaporation system and control valve composed of four parts, in addition to fans, ducts and other accessories and instrumentation. .The entire refrigeration system is a closed loop circuit, the refrigerant in the closed loop system, according to the need to control supply and the number of times into the evaporator, to obtain the appropriate temperature conditions. .Compressor is the heart of the refrigeration system, which promote the circulation of refrigerant in the system. .The role of the condenser is to exclude the compressed gaseous refrigerant in the heat, it condenses into liquid refrigerant; condenser cooling with air cooling, water cooling, air and water combine the three, only a small cold air cooling .application of refrigeration equipment. .The role of the evaporator to provide cooling to the refrigerator, the evaporator installed in the cold storage by using the blower to blow cool air in all parts of the library, a large cold air duct connecting the evaporator used to extend the air supply distance, the library .more uniform temperature drop. .In general, small refrigerator compressors used primarily closed. .Closed compressor power due to the small, relatively cheap; medium-sized cold storage is generally used in semi-closed compressor based; large cold storage, semi-hermetic compressors used in the selection, may also be considering the selection of ammonia refrigeration compressor, because the ammonia refrigeration compressor power .large, and a machine, but more cumbersome to install and manage. .The selection of the evaporator in the refrigerator, the temperature cold to use the evaporator air cooler, which is characterized by fast cooling, but could easily lead to loss of refrigerated water; in selection of seamless steel pipe cold storage evaporator coils produced mainly .characterized by effective temperature, and timely storage. .<BR>.