As the weather gets hotter and hotter, people's demand for refrigerated trucks has increased. Today, Xiao Bian has taught you to quickly understand refrigerated trucks from two aspects. I hope to help everyone in the selection of refrigerated trucks.
First, the classification of refrigerated trucks
Refrigerated cars are actually called refrigerated and insulated cars and can be classified into two types, refrigerated cars and insulated cars.
Insulated cars have insulated cabins and are suitable for cars that are transported in close proximity.
According to the cooling method, mechanical refrigerated trucks, frozen-plate refrigerated vehicles, liquid-nitrogen refrigerated trucks, dry ice refrigerated vehicles, ice-cold refrigerated vehicles, etc. Among them, mechanical refrigerated vehicles are the main models in refrigerated vehicles, and most refrigerated vehicles in China are also mechanically refrigerated. car.
According to the chassis carrying capacity classification: micro-refrigerated cars, small refrigerators, medium-sized refrigerated trucks, large-scale refrigerated trucks.
By compartment type: bread-type refrigerated trucks, van-type refrigerated trucks, semi-trailer refrigerated trucks.
Second, the refrigeration principle of refrigerated trucks
Refrigerator vehicles have a variety of cooling methods. The following five types of cooling methods are more common:
1, water ice and salt ice refrigeration: water ice refrigeration device investment is small, the operating cost is low, but the ordinary water (salt) ice unit mass of heat absorption is small, the car cooling is limited, and the melting of salt ice will pollute the environment, Foods, corroded cabins and goods are damp,
Therefore, water (salt) ice cooling is mainly used for refrigerated transportation of fish and other aquatic products.
2. Dry ice cooling: The equipment is simple, the investment and operation costs are low, the use is convenient, and the goods are not affected by moisture. The CO2 gas produced by the sublimation of dry ice can inhibit the reproduction of microorganisms, slow the oxidation of fat, and weaken the respiration of fruits and vegetables. However, the sublimation of dry ice can cause frost formation. Excessive CO2 gas will lead to difficulty in breathing and necrosis of cold products such as fruits and vegetables. Moreover, the temperature inside the car is difficult to adjust, the cost of dry ice is high, and the consumption is large, so the actual application is less.
3, cold plate cooling: the device itself is heavier, larger volume, occupying a certain volume of the compartment, and the cold plate cooling once only sustainable work 8 ~ 15H. Therefore, cold plate refrigeration is suitable for medium and short-distance transportation of medium and light refrigerated vehicles. In recent years, with the increasingly prominent problems of energy and environmental pollution, the application of cold plate cooling has developed rapidly and has become the second only to mechanical refrigeration. the way.
4, liquid nitrogen refrigeration: device structure is simple, reliable, no noise and pollution; liquid nitrogen refrigeration capacity, rapid cooling, suitable for quick freezing. Liquid nitrogen vaporization does not make the cabin damp, and nitrogen is good for keeping food fresh and preventing drying. In addition, liquid nitrogen refrigeration temperature control (positive and negative two degrees). However, the liquid nitrogen has a high cost and needs to be filled frequently, so the promotion is limited. Similarly,
Other low-temperature vaporized liquid gases can also be used as refrigerants, such as liquid carbon dioxide.
5. Mechanical refrigeration: Mechanical refrigeration methods include vapor compression, absorption, and steam injection. At present, the vapor compression type is the most widely used. Compression refrigeration units are mainly composed of compressors, condensers, throttle valves (or expansion valves) and evaporators.
Only after truly understanding the refrigerated trucks can they select the appropriate refrigerated trucks according to their own needs, so as to avoid causing the wrong type of refrigerated trucks to be purchased due to insufficient understanding.
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