*5.2. Calculation of Indoor Air Temperature*

In the heating season, the heat losses exceed the heat gains in the room, which are supplemented by the heating system. The regulation of this system allows for the maintenance of the constant temperature Ti = 20 ◦C, assumed in the example. In summer, the temperature of the indoor air is the result of the heat balance of gains and losses. Temperature fluctuations increase as the thickness of the insulation increases.

The calculation results of the average daily temperature of indoor air obtained using the Equation (14) are presented graphically in Figure 9.

During the heating season, the regulation ensures a constant temperature. In summer, there is a temperature change, and these fluctuations increase with increasing insulation thickness. The labels in Figures 9 and 10 were signed by adding units of insulation thickness as "Ti-0 cm" and analogously "Twi-0 cm".

From the graph in Figure 9 you can read the time during which heating is required, i.e., the duration of the heating season. This time depends on the insulation of the outer wall (insulation thickness).
