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

3.1 Building description 58
Case A4 0.0201 18.975 1.23 0.48 0.55 0.72 355.94
Case A5 0.0189 19.025 1.17 0.39 0.45 0.57 288.36
Case A6 0.0189 19.025 1.17 0.38 0.44 0.57 282.96
Case B1 0.0303 34.925 0.89 0.43 0.49 0.55 315.67
Case B2 0.0285 34.925 0.84 0.35 0.40 0.55 257.89
Case B3 0.0320 34.850 0.93 0.49 0.57 0.60 363.31
Case B4 0.0303 34.850 0.89 0.38 0.45 0.60 287.21
Case B5 0.0305 34.900 0.89 0.36 0.41 0.48 266.59
Case B6 0.0288 34.900 0.85 0.32 0.37 0.48 241.40
Explanation of symbols used in the Table 3.4:
Width – glazing system width; mm,
U-factor – standard measure of the rate of heat flow through the center of
(alternatively named glass in this case; W/m 2 K,
U-value)
SHGCc – the solar heat gain coefficient represents the solar heat gain
through the center of the glazing system relative to the total
incident solar radiation,
SCc – shading coefficient defines the amount of heat gain through the
center of glass compared to clear glass with 3 mm thickness,
VTc – visible transmittance defines the amount of light in the visible
radiation (portion of the solar spectrum between 380 nm to
760 nm) that passes through the center of glazing material,
The value of the U-factor depends on the thermal and optical properties of the glazing
systems as well as the external and internal environmental factors. The following
conditions are assumed in the computer code WINDOW 5.2:
• outside temperature – -21°C,
• indoor temperature – 18°C,
• windward speed – 5.5 m/s,
• sky temperature – -18°C,
• sky emissivity – 1.0,
• direct solar radiation flux – 0.0 W/m 2 .