With the rapid development of China's economy, refrigeration equipment has entered supermarkets, commerce, agriculture, industry and other fields, closely linked with our lives. Due to the rapid development of refrigeration, users face numerous manufacturers and various varieties on the market, often do not know how to choose, especially large demand, more investment, more difficult to increase the choice. Here we lianyungang freight forwarding company to introduce some cold storage common sense and purchasing methods, may be helpful for your purchase of cold storage.

Use and classification of cold storage

A cold storage house is a building that USES artificial refrigeration to change the temperature in a fixed space to a specified temperature so as to store goods easily. Cold storage can be widely used in food factories, dairy factories, pharmaceutical factories, chemical plants, fruit and vegetable warehouses, poultry and eggs warehouses, hotels, hotels, supermarkets, hospitals, blood stations, troops, laboratories and so on. Cold storage is mainly used for constant temperature storage of food, dairy products, meat, aquatic products, poultry, fruits and vegetables, cold drinks, flowers, green plants, tea, pharmaceuticals, chemical raw materials, electronic instruments and so on. Cold storage can be divided into different types according to various characteristics.

The first is classified according to the size of cold storage capacity. At present, the cold storage capacity is not unified, generally divided into large, medium and small. The refrigerating capacity of large cold storage is more than 10,000 tons; The refrigerated capacity of medium-sized cold storage is 10 ~ 10 thousand tons; The refrigerated capacity of small cold storage is under 1000 tons.

The second is classified by design temperature of refrigeration. Can be divided into high temperature, medium temperature, low temperature and ultra-low temperature four categories of cold storage.

The design temperature of general high temperature cold storage is -2℃~+8℃. The design temperature of medium temperature cold storage is -10℃~-23℃. The temperature of low-temperature cold storage is generally -23℃~-30℃. The temperature of ultra-low temperature quick-frozen storage is generally -30℃~-80℃.

Third, according to the library structure category classification.

The first is civil cold storage. This is a kind of cold storage building more at present, can build a single or multi-storey. The main body of the building is usually reinforced concrete frame structure or brick and concrete structure. The envelope structure of the civil cold storage is a heavy structure with high thermal inertia. The diurnal fluctuation of outdoor air temperature and diurnal temperature fluctuation caused by solar radiation on the outer surface of the envelope structure attenuates greatly in the envelope structure, so the internal surface temperature fluctuation of the envelope structure is small and the storage temperature is easy to be stable.

The second is the combination of plate cold storage. This kind of cold storage is in the form of single layer, and the storage board is the assembly structure of steel frame light prefabricated heat insulation board, and its load-bearing members are mostly made of thin-wall steel. The inner and outer plates of the storage board are colored steel plates, and the core material of the storage board is foamed rigid polyurethane or adhesive polystyrene foam board. Except for the ground, all components are prefabricated in a complete set in a professional factory and assembled on the site according to a unified standard, so the construction progress is fast and the construction period is short.

Again is the soil cold storage. It is also called earth cave cold storage, cave body is mostly arch structure, there are single cave body, also have continuous arch form. Generally for masonry, and a certain thickness of loess overburden as insulation layer. The foundation of the cave body should be on the sand and stone layer or bedrock which is not easy to frost heave. Due to its advantages of local conditions, local materials, simple construction, low cost and strong durability, it has developed greatly in northwest China.

There is a cave cold storage. Generally built in the stone is relatively hard, good integrity of the rock layer, the inner side of the cave generally do lining or spray anchor treatment, the rock cover thickness of the cave body is generally not less than 20 meters. Features and requirements

In order to maintain a certain low temperature inside the cold storage, insulation materials of a certain thickness are laid on the walls, floors and flat tops of the cold storage to reduce the heat from outside. In order to reduce the absorption of solar radiation energy, the exterior walls of cold storage are usually painted white or light color. Therefore, the cold storage building has its unique structure, which is different from the general industrial and civil buildings.

Cold storage building to prevent the diffusion of water vapor and air penetration. Outdoor air invasion not only increase the consumption of cold storage, but also into the warehouse moisture, moisture condensation caused by the building structure, especially heat insulation structure damage by moisture, so to set moisture-proof insulation layer, so that the cold storage building has good sealing and moisture-proof insulation performance.

The foundation of cold storage is affected by low temperature, and the moisture in the soil is easy to be frozen. Due to the volume expansion of the frozen soil, the ground will be broken and the whole building structure will be deformed, which will make the cold storage unusable. Therefore, in addition to effective heat insulation layer, the floor of low temperature cold storage must be treated under the heat insulation layer to prevent soil freezing.

Cold storage floor to pile up a lot of goods, but also to pass a variety of loading and unloading transport machinery and equipment, so its structure should be strong and have a larger bearing capacity. In the low temperature environment, especially in the periodic freezing and melting cycle, the building structure is vulnerable to damage. Therefore, the building materials of the cold storage and the construction of each part of the cold storage should have sufficient anti-freezing performance.

In general, the cold storage building is its strict insulation, sealing, firmness and frost resistance to ensure the quality of the building.

Choose the right cold storage

The import forwarder of lianyungang determines the size of the cold storage, the size of the door and the opening direction of the door according to the tonnage of the goods stored, the daily purchase and shipment volume and the size of the building. The installation environment of cold storage should be clean, dry and ventilated.

According to the stored items, choose to determine the temperature in the library. Select fresh storage (+ 5 ℃ ~ 5 ℃), refrigeration freezing (0 ℃ ~ - 18 ℃), or cryopreservation (30 ℃ - 18 ℃ ~ -).

According to the characteristics of their own buildings and the local water source, the choice of refrigerator refrigeration mode, generally have air cooling and water cooling. If the refrigerator is air-cooled, the user only needs to select the placement position. The refrigerating machine is water-cooled, and the size of the pool, the setting of the deep well, circulating water pipes and inlet and outlet pipes, as well as the placement of the water pump and cooling tower are required.

Complete the construction of auxiliary facilities

The foundation of the cold storage shall be 10cm gravel filling layer, and then 5 ~ 10cm concrete shall be poured. The ground shall be level. Expansion joints or ventilation pipes should be reserved on the ground of the cryogenic storage to prevent the ground from being affected by the low temperature and the volume expansion of the ground after it is frozen, resulting in ground fracture and structural deformation of the whole cryogenic storage.

According to the in and out of the weight of the vehicle (except people in and out), cold storage inside floor should not only should also be reinforcement, waterproof thermal insulation with Φ 10 ~ 14 mm rebar laid stencil, pouring 10 ~ 25 cm thick concrete.

Users who choose water-cooled chiller shall drill deep water Wells or build a water pool near the cold storage tank as required by the factory and lay circulating water pipes to connect to the cooling tower and unit location.

Power supply (three phase and four wire) is configured to meet the requirements of the cold storage. The power supply is led to the side of the cold storage and the special safety switch is configured.