Refrigerated truck is a closed van truck used to transport frozen or fresh goods, is a refrigerated special transport vehicle equipped with a refrigeration unit and a polyurethane insulated compartment, often used to transport frozen food (frozen car), dairy products (dairy transport vehicle), vegetables and fruits (fresh cargo transport vehicle), vaccine drugs (vaccine transport vehicle), etc.

The refrigerated car consists of the walking part of the special automobile chassis, and the thermal insulation envelope (generally composed of polyurethane materials, glass fiber reinforced plastic, color steel plate, stainless steel, etc.), refrigeration unit, temperature recorder and other components in the compartment, for special requirements of the vehicle, such as the meat hook car, can be equipped with meat hook, waist, aluminum alloy guide rail, ventilation groove and other options.

During the operation of the refrigeration system, the air compressor continuously inhales the low-pressure gaseous refrigerant in the evaporator, and after the compressor works, it becomes high-pressure refrigerant vapor and flows to the condenser, due to the high pressure, the condensation process is carried out in the condenser, and a large amount of heat is emitted to the surrounding environment, and the refrigerant from the condenser completely becomes liquid, when the liquid refrigerant flows into the expansion valve, due to the sharp drop in pressure, the liquid refrigerant undergoes an evaporation process in the evaporator, absorbing a large amount of heat from the compartment. As a result, the temperature in the compartment is lowered. The refrigerant vapor enters the air compressor again for the next working cycle, and so on, that the heat in the cabin is continuously transferred to the surrounding atmosphere.