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WindowWords

Fenestration
Originally, the arrangement of windows in a building. Now, windows, glazing, and shading devices.

Solar‐optical properties
The transmittance, reflectance, and absorptance of glazing materials for solar radiation.

Visible–light transmittance
That portion of the solar spectrum which is visible to the human eye. Too much visible light transmittance creates brightness and glare problems within the room. Visible–light transmittance must be a primary consideration when selecting a sunscreen shadecloth.

Solar heat gain
The amount of heat admitted through fenestration due to transmitted radiation and the inward flow of absorbed radiation.

Shading coefficient (SC)
The percentage of solar heat gain that passes through a combination of glass and screen. A lower shading coefficient means lower heat gain (better thermal performance). When used on the interior, light colors have lower shading coefficients than dark colors. Thus, light colors outperform dark colors. A lower shading coefficient equals lower heat gain, i.e., SC 0.60 = 60% relative solar heat gain; SC 0.45 = 45% relative solar heat gain.
When these same shadecloths are used on the exterior, this performance is reversed. For exterior shading, dark colors have a lower coefficient and, thus, outperform light colors. An explanation for this is that the lighter colors not only reflect heat away from the window but also reflect a substantial percentage back into the building as well.

Solar reflectance (SR)
The percentage of solar energy which is reflected or bounces off the shadecloth. Light colors are more reflective with lower heat gain and shading coefficients but with a higher percentage of daylight and solar transmittance. Light colors are brighter when sunlit (which causes high surface brightness, or bare–light–bulb syndrome) and may transmit excessive, debilitating light onto computer screens and workstations.

Solar absorbance (SA)
The percentage of solar energy which is absorbed by shadecloth. Dark colors absorb light and heat and are less energy efficient than lighter colors. They transmit less light and have a lower surface brightness which lessens the reflectivity and provides excellent glare–free environments on computer monitors and workstations.

Openness factor (OF)
The density of a shadecloth’s weave. To assure personal comfort near the window wall, it is necessary to control the direct solar–radiant energy (sunshine) that penetrates the glass/shade combination. This is accomplished with proper selection of shadecloth density in conjunction with the visible light transmittance of the glass.

Wave length
The distance between successive peaks or valleys of radiation waves: Measurement is in millions of a meter.

U–value
A measurement of the conductive inward or outward heat flow expressed as a percentage.

Emittance
The ability to give off radiant energy when compared to a perfect absorber. Different materials emit stored energy at different temperatures. Shadecloths emit much lower temperatures than, as examples, polished–aluminum or satin–aluminum finishes.

Long–wave emittance
Long–wave emittance is sensible heat which heats the air.

White and dark surfaces
Most shadecloth surfaces have a high long–wave emittance. Light–colored fabric surfaces will reflect more short–wave solar radiation and, therefore, absorb less. Dark–colored fabric surfaces absorb more short–wave radiation and reflect less.

E.S.I.
Equivalent sphere illumination which is provided by the luminous hemisphere.

Solar altitude
In degrees, the angle between a solar ray and the horizon.

Solar azimuth
In degrees, the angle between the north–south line and the horizontal projection of the solar ray.

WindowManagement®
The control of the admission of heat and light through windows by means of adjustable shading devices.