Figure 17 Solar irradiation on April 22nd

However, it has been found that the results for the peak solar heat gains were

different from those got after Ecotect simulations. The reason for that has

been suggested the weather change during that day which could cause a cloud

cover blocking of some of the solar energy. It could be seen in the Figure 16

two dips are visible at around 11:00 and 14:00 o clock obtained from the

Ecotect weather tool. At those times the clouding has increased substantially.

W/ m²

1.0k

0.8k

0.6k

0.4k

0.2k

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec 0.0k

Thus, in order to check that Ecotect is reliable and if the assumptions are

wrong in calculating solar heat gains, an additional calculation was performed

manually, but for other date. The further calculations for solar gains at 13:00 on December 31st were chosen for comparison where there no great

variations of the solar irradiance.

At December 31st 13:00, the upper window part of a west sided second floor is

partly shaded as shown in Figure 17 West side shading of the building on

December 31st 1pm . Moreover, the east façade of the building is also fully

shaded.

Calculations: