This can be done by reducing the light transmission or shading coefficient of the glass by integrally tinting it in various colours; grey, bronze, and green are common tints.
Furthermore, the yearly correlation models between shading ratio and shading coefficient for Hengchuen (22°N), Tainan (23°N), Taichung (24°N), and Taipei (25°N), respectively, are established as well.
The film can decrease the shading coefficient and solar heat gain coefficient by 44% and 22% if applied on the outside and inside of the existing windows, respectively.
This study provides a methodical procedure to establish summarized correlation for evaluating shading performance of horizontal shading devices based on the shading ratio and shading coefficient via the simulation of shading variables of 22 25° latitude north in Taiwan.
It is shown that the AZO/epoxy composite coating with 0.5 wt% AZO possesses excellent optical properties, i.e. visible light transmittance above 50% and shading coefficient of 0.45 are simultaneously achieved.
The energy efficiency for summer shading solar heat and for winter penetrating solar heat are both calculated for the choices and shading coefficient optimization analysis of the glass system.
Results show that significant energy savings are obtained for the thermal transmittance (U-value) of exterior walls, infiltration rate, ventilation and shading coefficient, of which the sum relative sensitivity is about 91.06%.
The results showed the effects of several conventional treatments at the façade for improving the energy performance of the envelope of a residential building, including increasing the wall thickness, reducing the window-to-wall area ratio, reducing the shading coefficient of the window glass, and inclusion of overhangs, and sidefins at windows.
These include: i) building envelope - window shading coefficient, window U-value and window-to-wall ratio; ii) internal load – equipment, lighting and occupancy; iii) HVAC system - outdoor fresh air, summer and winter thermostat set points, fan efficiency and fan static pressure; and iv) HVAC plant – chiller COP and boiler efficiency.
Overall heat transfer and shading coefficients are derived from the experimental results.
