How to refrigerate?

When doing cold storage, we should pay attention to the following points: the classification of cold storage, the determination of cold storage capacity, the selection and installation of cold storage insulation materials and the selection of cold storage cooling system.

1, cold storage classification

The production of cold storage can be divided into three categories: storage cold storage, retail cold storage and productive cold storage.

Productive cold storage is carried out according to the nature of use, aiming at the origin of centralized supply. We should also consider factors such as convenient transportation and access to the market. Cold storage should be built in a cool place without sunlight and frequent hot air, and small cold storage should be built indoors.

There should be good drainage conditions around the cold storage, the groundwater level should be low, and it is best to have an interlayer under the cold storage. It is very important for the cold storage to adhere to good ventilation and drying. In addition, before the cold storage is completed, a three-phase power supply with corresponding capacity should be set in advance according to the power of the refrigerator.

2. Determination of cold storage capacity

Plus the aisle between rows, the size of the cold storage should be designed according to the maximum number of agricultural products to be stored all year round. This capacity is based on the volume that storage products must occupy in the cold storage. The space between the pile and the wall, the gap between the ceiling and the packaging are calculated.

Determine the capacity of the cold storage, then determine the length and height of the cold storage. Necessary ancillary buildings and facilities, such as workshop, packaging and sorting room, tool library and loading and unloading platform, should also be considered when building cold storage.

3. Selection and installation of insulation materials in cold storage production

To have good thermal insulation performance, the selection of thermal insulation materials for cold storage must be adapted to local conditions. But also economical and practical.

There are several types of insulation materials for cold storage. One is a plate with a fixed shape and specification, which has a fixed length, width and thickness, and the corresponding specifications can be selected according to the installation needs of storage objects. 15cm thick plate is generally used for high and medium temperature cold storage, and 15cm thick plate is generally used for low temperature cold storage and frozen cold storage.

Another kind of cold storage can be sprayed with polyurethane foam, and the data can be directly sprayed into the brick or concrete warehouse to be built, and then it is moisture-proof and heat-insulating. The structure of modern cold storage is developing to assembled cold storage. The cold storage components, including moisture-proof layer and insulation layer, are made and assembled on site. Its advantages are convenient, fast and movable construction, but its cost is high.

4. Selection of cooling system in cold storage production

Small cold storage is mainly based on fully enclosed compressor, which is relatively cheap because of its low power. The choice of refrigeration system in cold storage is mainly the choice of compressor and evaporator in cold storage. Medium-sized cold storage generally chooses semi-enclosed compressor as the main; Semi-enclosed compressor is selected for large cold storage.

Extended data:

Cold storage equipment composition:

1. Generally, the cold storage is mostly refrigerated in the refrigerator. Liquid (ammonia or freon) with extremely low gasification temperature is used as coolant, which evaporates under low pressure and mechanical control to absorb the heat in the storage room, thus achieving the purpose of cooling down.

2. The most commonly used is the compression refrigerator, which is mainly composed of compressor, condenser, throttle valve and evaporation tube. According to the evaporation tube device, it can be divided into direct cooling and indirect cooling. The direct cooling evaporation pipe is installed in the cold storage. When the liquid refrigerant passes through the evaporation tube, it directly absorbs the heat in the warehouse and cools down.

3. Indirect cooling means that the air in the warehouse is sucked into the air cooling device by the blower, and then absorbed by the evaporation tube hovering in the cooling device and sent to the warehouse for cooling. The advantages of air cooling mode are rapid cooling, uniform temperature in the warehouse, and harmful gases such as carbon dioxide generated during storage can be taken out of the warehouse.

Baidu encyclopedia-cold storage