Refrigeration mode of refrigerated vehicle

date:2021-05-07

-----------------------------------------------

Refrigerator van truck

Refrigerated cars are cooled in several ways

Refrigerated vehicles are refrigerated in the following ways

1, water ice and salt ice refrigeration

The melting point of ice at atmospheric pressure is 0℃.The heat absorption of ice at melting is.8kJ/kg. The melting point can be reduced by adding salt to water ice.Within a certain range, the more salt in the water ice, the lower the melting point.The experiment

It is proved that when the mass of salt is 29% of the mass of water ice, the melting point of the mixture can reach the lowest value of -21.2℃.If the salt content is increased, the melting point will not decrease.It is usually based on the temperature at which refrigerated goods are transported

Choose salt ice with different ingredients.For example, by using salt ice with a salt content of 22%, the temperature in the carriage can be kept between -18 ℃ and -13℃.

The water ice refrigeration device has less investment and low operating cost, but the heat absorption per unit mass of ordinary water (salt) ice is small, and the cooling in the carriage is limited.In addition, the melting of salt ice can pollute the environment, food, corrode train cars and damp goods.Therefore, water (salt) ice refrigeration is mainly used for the refrigerated transportation of fish and other aquatic products.

2, dry ice refrigeration truck

Under one atmospheric pressure, the sublimation temperature of dry ice (solid CO2) is low (-78.9℃), and the sublimation heat absorption is large (.5kJ/kg). Therefore, it can be used as the carriage cold source, not only to obtain a lower temperature (generally lower than -20℃), but also to obtain a larger cooling capacity.Therefore, the refrigeration method is suitable for the transportation of frozen food.

The dry ice refrigeration equipment is simple, the investment and the operation cost is low, the use is convenient, the cargo will not be affected by the damp.Coz gas produced by sublimation of dry ice inhibits microbial growth, slows fat oxidation, and impairs the respiration of fruits and vegetables.However,

The sublimation of dry ice causes frost easily.Excessive CO2 gas will lead to fruit, vegetables and other refrigerated breathing difficulties and necrosis;The temperature in the box is difficult to adjust;Dry ice is less practical because of its high cost and high consumption.

3, cold plate refrigerator box truck

The principle of cold plate refrigeration is to use the refrigerant (refrigerant) refrigerated after the storage of cold amount of refrigeration.Before transportation, the cold storage agent in the cold plate in the compartment is "chilled" to cool and freeze it, and then the cold storage agent in the cold plate is used to melt and absorb heat during transportation, so that the temperature in the compartment is kept within the appropriate temperature range of the transportation goods.Therefore, the cold plate is also called "storage cold plate".

The structure type of cold plate refrigeration device is divided into integral type and split type.The integrated power unit, refrigerating unit and cold storage plate are all placed on the vehicle;The split type is only equipped with refrigeration unit and cold storage plate on the vehicle.When parking, use ground fixation

The force device drives the refrigerating unit to "charge" the cold storage plate.The latter is often used in practical applications.Commonly used cold accumulators are eutectic solutions with low melting point, whose melting point is usually about 10℃ lower than the appropriate temperature in the chamber.When the appropriate temperature for transporting goods changes

, the composition of the selected eutectic solution should also be changed accordingly.

--------------------------------------------

Hot sales refrigerated models are as follows:

1. High cost performance refrigerated freezer truck : 15tons refrigerated truck DONGFENG
2. High quality ISUZU refrigerated van truck: ISUZU 10-15TONS fish freezer van truck
3. load 5tons cool trucks:  5tons ISUZU ELF refrigerator truck sale  
4. load 8tons fridge van trucks : ISUZU ELF 8tons 10tons freezer van truck
5.  load 20TONS 30tons refrigerated box truck : 20tons ISUZU refrigerator truck
6.  load 40TONS 50tons 60TONS refrigerated truck : 12 wheels 50TONS ISUZU refrigerator truck