**Abstract**

In this chapter, in order to select the directions of development and develop scientifically based technical solutions to improve the thermal parameters of the bodies of refrigerated wagons and containers for the transportation of perishable goods in the conditions of the Republic of Uzbekistan, experimental studies of new design solutions for fencing refrigerator bodies and containers have been carried out. For conducting experimental research a method of experimental determination of the body heat transfer coefficient using a closed thermally insulated chamber in the form of a parallelepiped with a replaceable upper face (cover) has been developed. As a result of comprehensive research using analytical calculations and field experiments, it was found that a promising option for thermal body fencing is a technical solution where polyurethane foam and "Corundum" are used as thermal insulation. The use of these technical solutions in the fences of refrigerated wagons bodies and containers will reduce the heat transfer coefficient by up to 20% and, accordingly, reduce the thickness of the fence by 20–30%, which will lead to an increase in the internal useful volume of the body, a decrease in its mass and consumption of materials used, and an improvement in the thermal state of the body.

**Keywords:** refrigerated wagon, refrigerated container, body fencing, heat transfer coefficient, thermal insulation, thermal insulation material, corundum material, test chamber, climatic chamber
