*3.1. DSC Test*

Before starting the dynamic DHFMA testing of the building material, thanks to the kindness of Netzsch, it was possible to perform a calorimetric study of the Micronal itself. It is an organic material which, according to the manufacturer's data, has a melting point of 23 ◦C. PCM makes up about 30% of the weight of the SmartBoard panel. The phase change material added to the plasterboard matrix is in the form of microcapsules (with a diameter of 2–20 μm) filled with paraffin.

The thermal characteristics of the PCM materials used, obtained as a result of DSC tests, are shown in Figure 1. The tests performed by Netzsch were carried out in the DSC 214 Polyma calorimeter with an aluminum melting pot, for the range from −50 ◦C to +50 ◦C. Calorimetric studies allowed the value of the heat of the phase change to be determined: PCM 23: 127.7 J/g. This value is similar to the properties of PCM described in article [9], where Micronal with a heat of fusion of 110 J/g was used and was significantly lower than the paraffin presented in [11] of 151 J/g. The phase transition range is a wide temperature range from 17.8 ◦C to 31.5 ◦C, practically identical in the case of heating and cooling of the material. However, the peak heat flux was achieved at 25.1 ◦C, not 23 ◦C. During the DSC test, there was no sub-cooling effect, but there was a noticeable difference between the heat capacity in the entire heating and solidification process.

**Figure 1.** Results of DSC test.

#### *3.2. FOX 314 Tests*

The equipment used for dynamic tests of thermal conductivity and heat capacity is a device called FOX 314, manufactured by LaserComp USA, serial number: 1043. The design of the FOX 314 device is based on the method of measuring thermal resistance using heat flux sensors in stationary conditions and is compatible with the following standards:


The characteristics of the sample tested in the FOX 314 apparatus are:

geometrical dimensions: 300 × <sup>301</sup> × 14.8 mm; volume: 0.001336 m3; weight: 1089.36 g; density: 815.12 kg/m3.

3.2.1. Thermal Conductivity Tests

The values of the thermal conductivity coefficient shown in Table 1 were tested for two sets of temperature differences:


**Table 1.** Thermal conductivity coefficients of Micronal® PCM SmartBoard™ 23 plasterboard in two temperature ranges: from 0 to 20 ◦C and from 10 to 30 ◦C.

