Let's talk about the important equipment for refrigerated transportation, which is the transportation tool. The refrigerated transportation vehicles in developed countries include railway refrigerated trucks, refrigerated containers, refrigerated cars, refrigerated trailers, refrigerated semi trailers, and railway road refrigerated vehicle bodies in various forms. In competition, railway refrigerated trucks are gradually being squeezed out by refrigerated containers and road refrigerated trucks.

Railway refrigerated trucks are still one of the basic tools for long-distance refrigerated transportation. The characteristics of railway refrigerated cars are: good insulation and air tightness of the body, cooling equipment inside the car, and the ability to maintain a lower temperature than the outside air during warm seasons.

In the cold season, refrigerated trucks can also be used for transportation without refrigeration or with heating appliances for transportation The interior of the car can maintain a higher humidity than the outside air. But because its main purpose is refrigeration So 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 efficiency K. The smaller the K value The fewer hot children are transmitted into the vehicle through the body enclosure structure per unit time. With the emergence of new insulation materials such as poly (azoxyacetic acid), as well as the trial production and successful application of sandwich insulation structures.

② Having useful refrigeration and heating equipment. To establish thermal balance inside the car and maintain the required stability.

③ Equipped with loading equipment and ventilation ring devices to ensure reasonable loading of goods and uniform temperature inside the vehicle. And it is possible to exchange air when needed.

④ Equipped with reliable detection instruments To accurately reflect the degree of depression inside the car.

A refrigerated truck can maintain some degree of coolness in the car, relying on these conditions The heat transmitted from the outside and the heat emitted by the goods themselves are continuously absorbed by the cold side inside the car, establishing a thermal balance inside the car.