*5.4. Analysis of Thermal Power Variability for Heating Purposes*

Using the proposed methodology, calculations of thermal power for heating were performed for the conditions assumed in Section 2. The diagram given in Figure 12 shows the dependence of this power on the insulation thickness.

The chart of changes in heat demand for heating (Figure 11) clearly shows the division into the heating season and the summer season. The demand in the heating season depends (which is obvious) on the insulation of the outer wall. The length of the heating season tg also depends on the insulation performance.

The maximum heat output, which is the basis for the selection of heating devices, is also different for each case. The comparison of these powers is shown in Figure 13. The diagram also includes heating powers Qmaxn calculated on the basis of the applicable standards. Qmax denotes the maximum thermal power for a given case of the partition structure, calculated according to the considered methodology. Qmaxn means the maximum thermal power for a given case of the partition structure, calculated on the basis of the applicable standard PN EN 12831 titled "Heating installations in buildings. Design heat load calculation method".

**Figure 12.** Variability of thermal power for heating over time.

**Figure 13.** The dependence of the maximum heat output of heating on the thickness of the insulation.

Among the calculated thermal powers presented in Figure 12, the maximum powers Qgmax necessary to ensure thermal comfort were selected. Such powers Qgmaxn were also calculated for the considered cases in accordance with the standard. The values are presented in the Table 3 and in the diagram in Figure 13.


**Table 3.** Results of thermal power calculations for various insulation thickness.

The following conclusions can be drawn from the presented values:

