Solar And Shading Factor For Doors And Windows

Shading coefficient sc is a measure of thermal performance of a glass unit panel or window in a building.

Solar and shading factor for doors and windows.

The lower the window shading coefficient the less solar heat it transmits and the greater shading ability it has. Window and skylight u factor and shgc values are maximum acceptable levels. Our solar screen products are manufactured to block between 65 and 90 of the sun s heat and glare. In hot climates like arizona a low shgc helps reduce energy costs.

But like a winter coat you should pick the windows doors and skylights that make the most sense for your climate. Solar heat gain coefficient shgc is the fraction of solar radiation admitted through a window door or skylight either transmitted directly and or absorbed and subsequently released as heat inside a home. The window projection factor shall be determined in accordance with equation 4 5. The lower the shgc the less solar heat it transmits and the greater its shading ability.

This results in a more comfortable indoor air temperature more efficient air conditioning and ultimately energy conservation. The tight weave blocks solar rays from penetrating the glass on doors or windows. Windows energy holes in our homes. Phifer s exterior sun control products are designed to absorb and dissipate 65 to 90 percent of the sun s heat and glare before it reaches window or door glass.

The shading coefficient for window shades is expressed as a number between 0 and 1. The lower the shgc the less the amount of solar radiation that is allowed to pass through the window and become unwanted additional heat in the summer. In cold climates however a higher shgc helps reduce energy costs. The maximum u factor and solar heat gain coefficient shgc for fenestration shall be as specified in table c402 4.

When fixed exterior sun screens are installed in a window or door the tightly woven fabric acts as a barrier between solar rays and your home. As a result a lower number produces greater summer comfort. It is the ratio of solar gain due to direct sunlight passing through a glass unit to the solar energy which passes through 3mm clear float glass. Solar heat gain coefficient shgc is the total percentage of solar energy at a window opening that is either absorbed and reflected into a building or directly transmitted through the window.

Interior shades for windows though not generally as effective as exterior shading light colored drapes shades or blinds can reduce solar gain by 10 to 50 for typical curtains or blinds to as high as 70 for an insulated reflective shade that seals tightly around the window perimeter. Windows doors and skylights protect you from the elements just like a winter coat. It is an indicator of how well the glass is thermally insulating shading the interior when there is direct sunlight on the panel or window.