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

3.3 Estimation of thermal energy gain and loss through building fenestration 71
Window Heat Gain and Loss Energy [kWh/m 2 ]
1,000
0,800
0,600
0,400
0,200
0,000
‐0,200
‐0,400
12/01
12/03
12/05
12/07
12/09
12/11
12/13
12/15
12/17
12/19
12/21
Fig. 3.20: Energy balance for the south window in December (left side of fig.) and in March (right side of
fig.).
From the above figures, it can clearly be seen that even a window with a view facing south
has a negative balance of energy during December. Therefore it is necessary to analyze not
only the entire building performance, but each façade separately and their influence on the
total energy consumption. All shading surfaces, attached as well as detached to the
building structure, are included within the energy simulation model in order to create the
optimal physical reality.
3.3.2 Analysis of the energy balance for windows
12/23
12/25
12/27
12/29
12/31
Window Heat Gain and Loss Energy [kWh/m 2 ]
This part of the dissertation focuses on the relationship between the space-heating energy
consumption and the area of the glazing system. It was decided to change the window-towall
ratio (WWR) for the whole building to ensure that the optimal value of WWR exists in
the first order. The simulations were done for a heating period and the results are shown in
Fig. 3.21.
1,800
1,600
1,400
1,200
1,000
0,800
0,600
0,400
0,200
0,000
‐0,200
‐0,400
03/01
03/03
03/05
03/07
03/09
03/11
03/13
03/15
03/17
03/19
03/21
03/23
03/25
03/27
03/29
03/31