Electronically Tintable Glass
The LEED rating system has a strong emphasis on Daylighting and Views. This is a credit in the Indoor Environmental Quality section, of which a project has the ability to earn as many as 15 points towards certification.
In the case of Daylight and Views, there are two separate credits, Credit 8.1 -- Daylight for at least 75 percent of spaces, and Credit 8.2 -- Views for at least 90 percent of spaces.
Normally, for views, this can be accomplished by placing windows within proper line of site from where the occupants are sited, as prescribed by the USGBC LEED Reference Guide. For Daylight, this can be also accomplished by window placement as well as skylights, clerestories and use of reflective wall coatings to further increase the required amount of daylight to 75 percent of the building's occupants.
In the case of views, the type of glass chosen can have a significant effect on the not only the available view, but several additional factors that can lead to earning additional LEED credits in related areas. This is a good example of the concept of Synergy and Trade-Offs, which are a feature that sets the sustainable building process apart from that of standard construction.
Sage Glass has a product that can be of real value here in not only the area of views but also for the category of Optimize Energy Performance -- Credit EA 1, as well as three Indoor Environmental Quality credits -- Credit 6,-- Controllability of Systems, Credit 7 -- Thermal Comfort, and Credit 8 -- Daylight and Views.
This is due to the fact that their electronically tintable glass products have an exceptional performance rating in the areas of solar heat gain factor. The value here is .09, in its tinted state, which helps with summer air conditioning loads, as well as glare control. In addition, their glass in clear state, has a 100 percent clear outside view at times when tinting is not needed. The Department of Energy considers glass "green spectrally selective" when it has a Light to Solar Gain (LSG) of 1.25 or greater. The Sage Glass product has an LSG range of 3.9 to 6.9, making it far exceed the requirements, and thus make it help to qualify for not one, but up to FOUR LEED credits, for a total of four points, as described above. In using this type of glass, glare is reduced, heat gain is reduced, and 100 percent view to the outside are preserved when appropriate. The controllability of Systems is accomplished by the electronic tintable feature of the glass, which cuts glare without having to totally rely on shades, drapes or blinds.
In the case of Daylight and Views, there are two separate credits, Credit 8.1 -- Daylight for at least 75 percent of spaces, and Credit 8.2 -- Views for at least 90 percent of spaces.
Normally, for views, this can be accomplished by placing windows within proper line of site from where the occupants are sited, as prescribed by the USGBC LEED Reference Guide. For Daylight, this can be also accomplished by window placement as well as skylights, clerestories and use of reflective wall coatings to further increase the required amount of daylight to 75 percent of the building's occupants.
In the case of views, the type of glass chosen can have a significant effect on the not only the available view, but several additional factors that can lead to earning additional LEED credits in related areas. This is a good example of the concept of Synergy and Trade-Offs, which are a feature that sets the sustainable building process apart from that of standard construction.
Sage Glass has a product that can be of real value here in not only the area of views but also for the category of Optimize Energy Performance -- Credit EA 1, as well as three Indoor Environmental Quality credits -- Credit 6,-- Controllability of Systems, Credit 7 -- Thermal Comfort, and Credit 8 -- Daylight and Views.
This is due to the fact that their electronically tintable glass products have an exceptional performance rating in the areas of solar heat gain factor. The value here is .09, in its tinted state, which helps with summer air conditioning loads, as well as glare control. In addition, their glass in clear state, has a 100 percent clear outside view at times when tinting is not needed. The Department of Energy considers glass "green spectrally selective" when it has a Light to Solar Gain (LSG) of 1.25 or greater. The Sage Glass product has an LSG range of 3.9 to 6.9, making it far exceed the requirements, and thus make it help to qualify for not one, but up to FOUR LEED credits, for a total of four points, as described above. In using this type of glass, glare is reduced, heat gain is reduced, and 100 percent view to the outside are preserved when appropriate. The controllability of Systems is accomplished by the electronic tintable feature of the glass, which cuts glare without having to totally rely on shades, drapes or blinds.
Posted by Alan L. Englander at 12/25/2008 11:59 PM 
Categories: Windows, Trade-Offs, LEED Credits, Synergy, Glazing
Categories: Windows, Trade-Offs, LEED Credits, Synergy, Glazing
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