analysis of the influences of solar radiation and façade glazing ...

3.4 Testing of a building indoor environment during the warm period 85
Based on the results of the simulation we can affirm that:
• Intensive cooling with outside air at night, protection facade shields and window
shades located on the internal side do not secure thermal comfort during more than
half of the warm period,
• The window shade with the high reflection surface mounted outside and near the
fenestration guarantees the best protection of gains resulting from solar radiation
during the summer.
First of all, the relatively high inside operate air temperature is the result of a large
fenestration area of each segment and also of internal heat gains. Apart from that, the high
thermal insulation of the windows limits heat transfer when the outside air temperature is
lower than the inside temperature. We can observe the lowest level of thermal comfort in
apartments OG2 and OG3. The PMV index reaches about 3 in June and September.
Comparatively good conditions of comfort are present in segments OG1 and OG4. Due to
effective external shading devices and night cooling, the internal air temperature stays
below 28°C.
The next simulations were conducted to compare the designed fenestration area with the
optimal windows area in summer conditions. Results of the analysis are presented in the
figures below.