Where is the secret of energy saving in cold storage

Where is the secret of energy saving in cold storage

For most fruit farmers, the storage of fruits and vegetables is particularly important in order to gain a good momentum in the coming year. Everyone is not unfamiliar with the storage method of fruits and vegetables in cold storage, but how can we save energy when using cold storage? Maybe many friends are not very clear. The editor of okmarts.com will discuss with you the energy saving of cold storage and other related issues.

The factors of cold storage energy consumption mainly include the type and thickness of the cold storage insulation layer, the performance of the cold storage refrigeration system, the selection of refrigerants, the selection of compressor condensers and evaporators, the scale and layout of the cold storage, and the cold storage The number of times of entering and exiting the goods, the insulation performance of the outer door of the cold storage, etc., to improve the energy saving efficiency of the cold storage, all factors should be considered.

　　 Energy-saving cold storage means to reduce energy consumption is usually divided into two parts: 1) reduce the cold storage cooling load, (2) cold storage equipment selection.

　　Energy saving of fruit and vegetable cold storage

Fruit and vegetable mini cold storage refers to the cold storage board, refrigeration unit, evaporator, etc., which must be pre-manufactured in the factory, and then installed on the factory site to become an assembled cold storage or a civil cold storage or a semi-assembled and semi-civilized cold storage for preservation. Cold storage for storage. Classified by design temperature, Guoshu mini cold storage is a high-temperature cold storage. Mini cold storage is composed of refrigeration system, warehouse, control system, etc.

　　Shadow Fruit and Vegetable Cold Storage Energy Consumption Factors and Cold Storage Energy Saving Measures:

　　1. Cold storage enclosure structure

　　The cooling capacity of the cold storage through the enclosure structure is proportional to the unit heat flow of the cold storage enclosure. Therefore, more efforts should be made to reduce the unit heat flow index of the cold storage enclosure structure of the cold storage. To reduce the unit heat flow of the envelope structure, firstly, the thermal conductivity of the insulation material should be small, and the secondly, the envelope structure layer should be thicker. However, the thickness should generally not be too thick, otherwise problems such as increased construction costs and wasted space will occur. Therefore, insulation materials should be selected within a suitable thickness range. Under normal circumstances, insulation materials are required to have low thermal conductivity, low water absorption, good low temperature resistance, and the cost should not be too high.

2. Moisture-proof and steam-proof of cold storage enclosure structure

　　 It is also necessary to take moisture-proof and vapor-proof measures for the enclosure structure of the cold storage, otherwise the insulation performance of the insulation material will deteriorate. This is the reason why the insulation performance of the cold storage body is good when it is first used, but the insulation effect becomes worse after a period of use. Since water vapor permeates from the high-temperature side to the low-temperature side, the moisture-proof vapor barrier layer should be placed on the side with the higher temperature of the insulation layer.

　　3. Evaporating pressure and temperature of cold storage

　　The evaporation temperature corresponds to the evaporation pressure. After knowing the evaporation pressure, the evaporation temperature can be obtained by looking up the table. Under the condition of a certain temperature in the cold storage warehouse, the temperature difference (the difference between the evaporating temperature and the warehouse temperature) is reduced, the evaporating temperature can be increased accordingly, and the refrigeration capacity of the cold storage refrigerator will be increased, that is, the cycle efficiency will be improved. It also saves power.

　　4. Cold storage defrost operation

Generally speaking, when the resistance of the frost layer on the surface of the evaporator to the air is not significant, before the flow of air through the evaporator has not been reduced, the effect of the frost layer is not serious, and defrost is not necessary; when the air flow is significantly reduced , Defrost should be carried out. The greater the humidity of the air, the greater the temperature difference between the evaporator and the cold storage, the easier it is to frost on the evaporator.

　　 5. Cold storage storage temperature and cold storage warehouse utilization

　　 Different fruits and vegetables have different storage temperatures, and each kind of fruit and vegetable also has a suitable temperature range for its storage. Without affecting the quality of fruits and vegetables, energy-saving cold storage should use a higher storage temperature. As the temperature of the cold storage is high, the evaporation temperature of the refrigeration system will increase accordingly, the refrigeration capacity of the refrigerator will be increased, and the cycle efficiency will of course be improved. Increasing the temperature of the cold storage is more importantly, it can also reduce the heat transfer through the storage body.

　　The utilization rate of the energy-saving cold storage warehouse is the ratio of the actual volume of fruits and vegetables to the effective volume of the warehouse. The volume utilization rate of the mini cold storage is generally not less than 0.3, and of course it cannot be too high, otherwise it will be difficult to cool down. When the volume of the fruits and vegetables to be stored changes greatly, they should be divided into two or more cold storage rooms. In addition, a reasonable storage period must be selected, which is self-evident for the energy saving of cold storage.