**4. Experimental setup and calibration**

A general view of the thermally insulated chamber (TIC-1) in **Figure 1** and the geometric mean areas of the chamber elements are given in **Table 3**.

The test chamber is made of 100 mm thick expanded polystyrene, the inner dimension of which is 220 220 280 mm. The top of the test chamber (cover) is a test piece of thermal insulation (fence). Samples for the calibration of the test chamber were designed in the form of a cover measuring 320 320 mm and a thickness of 50 and 100 mm.


#### **Table 3.**

*Geometric average areas of the chamber elements.*

*Experimental Research of New Design Solutions for Fencing Refrigerated Wagon Bodies… DOI: http://dx.doi.org/10.5772/intechopen.109744*

The geometric mean areas of the fence elements of the test chamber (**Table 3**) were determined by the formula:

$$F\_{av} = \sqrt{F\_{out} \cdot F\_{in}},\tag{7}$$

The TIC-1 chamber is equipped with a heating element (electric lamp 25 W), connected through a meter to an electric source, and MS-227R4 thermocouples, as well as a W1209 thermostat for temperature control. The heating element is installed so that it evenly heats the inside of the test chamber.

The test chamber was placed in a special climatic chamber of the (CHALLENGE CH600C) series equipped with the necessary measurement and monitoring means, where the temperature can be maintained in the range from �75 to +180°C. When calibrating, the test chamber was placed inside the climatic chamber, and the temperature was maintained at 40°C inside and �20°C outside. The correlation between

#### **Figure 2.**

*Dependence of power consumption on the time of the experiment at a temperature outside* �*20°C (2) and inside the test chamber +40°C (3).*


#### **Table 4.**

*Experimental data and results of determining the heat transfer coefficient of the TIC-1 test chamber.*

electricity consumption and temperature inside and outside is shown in **Figure 2**. It can be seen from it that the temperature remained practically constant, and the power consumption linearly depended on the time of the experiment. The results of processing the experimental data are shown in **Table 4**.
