Chongqing refrigerated truck editor will talk about the various forms of refrigerated transportation vehicles in developed countries, including railway refrigerated trucks, refrigerated containers, refrigerated cars, refrigerated trailers, refrigerated semi trailers, and railway highway refrigerated vehicle bodies. In competition, railway refrigerated trucks are gradually being squeezed out by refrigerated containers and road refrigerated trucks.

In the search for a country, railway refrigerated trains are still one of the essential tools for long-distance refrigerated transportation. The characteristics of railway refrigerated cars are: body insulation, good air tightness, cooling devices inside the car, and the ability to maintain a lower temperature than the outside during warm seasons.

In the cold season, refrigerated trucks can also be used for transportation without adding cold insulation or using thermal appliances (mechanical refrigerated trucks) to heat transportation, and the temperature inside the car can be maintained higher than the outside temperature. But because its main purpose is refrigeration, it is still called a refrigerated truck.

① Having a well insulated body to reduce heat exchange between the interior and the outside world. The thermal insulation performance of refrigerated trucks is represented by the total heat transfer coefficient K. The smaller the K value, the less heat demon is transmitted into the car through the body enclosure structure per unit time.

With the emergence of new insulation materials such as polyethylene terephthalate and the trial production and successful application of sandwich insulation structures, modern refrigerated trucks have reduced their heat transfer coefficient values to below 0.23W/(m2 · K).

② Having useful cooling and heating equipment to establish thermal balance inside the vehicle and maintain the required stable temperature.

③ Equipped with loading equipment and ventilation circulation equipment to ensure the reasonable loading of returned goods, uniform temperature inside the vehicle, and the possibility of air exchange when needed.

④ Equipped with reliable side gauges to accurately reflect the temperature conditions inside the vehicle.

A refrigerated truck can maintain some temperature inside the vehicle, relying on these conditions to continuously absorb the heat transmitted from the outside and the heat emitted by the goods themselves by the cold side inside the vehicle, establishing a thermal balance inside the vehicle.