Originally published in Interiors & Sources

08/17/2009

New Options for Insulated Glass

 
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    COURTESY OF SOUTHWALL TECHNOLOGIES

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    COURTESY OF SOUTHWALL TECHNOLOGIES

  • /Portals/2/ATWeekly/0809/A_0809_ATW_Insulated_Glass3.jpg

    COURTESY OF SOUTHWALL TECHNOLOGIES

  • /Portals/2/ATWeekly/0809/A_0809_ATW_Insulated_Glass4.jpg

    COURTESY OF SOUTHWALL TECHNOLOGIES

When it comes to energy efficiency in commercial buildings, windows can often be pinpointed as a setback. Twenty-five (25) to 35 percent of the energy used in commercial buildings is wasted because of old or inefficient glass, and glass in commercial buildings is to blame for more than 10 percent of carbon emissions. And, there’s often a large energy-performance gap between the R-values of walls and windows, devaluing a wall’s high R-value.

Low-E glass was once the answer to energy-efficient windows. Single-pane glass was no longer adequate for most commercial/institutional buildings, and standard insulating glass only provided an R-value of 2. Enter low-E glass: It provided twice the insulating performance of standard insulating glass, and it reflects radiant solar and ambient heat.

Although it provided great insulating performance when it was first introduced, generic low-E glass doesn’t represent the level of efficiency necessary to keep moving forward – especially considering the U.S. Department of Energy’s ENERGY STAR® new window performance standards, which will take effect as of Jan. 1, 2010. Even though it was once the standard, low-E coated glass has become a minimum performance standard. These days, there are some new options.

Make decisions about glass options in terms of how they affect LEED ratings:

The thermal and solar shading performance of suspended film insulating glass can earn up to 21 LEED points.

-Sustainable Sites (SS) Credit 1, Site Selection
-Energy and Atmosphere Credit 1, Optimize Energy Performance
-Materials and Resources Credit 1, Building Reuse
-Materials and Resources Credit 5, Regional Materials
-Indoor Environmental Quality Credit 2, Increased Ventilation
-Indoor Environmental Quality Credit 7, Thermal Comfort
-Indoor Environmental Quality Credit 8, Daylight & Views

Two choices that meet ENERGY STAR’s proposed Phase 2 window performance standards, which could take effect as early as 2013, stand out:

  1. Triple-pane glass. Triple-pane glass consists of three panes of glass and two low-E coatings. By using a third pane of glass, a second insulating cavity is produced (multi-cavity window construction). But, triple-pane glass is much heavier than standard insulating glass, which means that a stronger window framing is required (and costs increase, too). If this glass is used in doors/entrances, it can make door use tricky for seniors, children, and the physically disabled. Also, the additional coated glass can weaken visible light transmission by 20 percent or more, possibly reducing the comfort and efficiency benefits of natural light.
  2. Suspending a low-E, solar-reflective film inside an insulating glass unit. Film can create two, three, or four insulating cavities that maximize light transmission and provide a range of conservation performance. Internally mounted film has the benefits of film-based and glass-based technologies. It forms a lightweight, multi-cavity insulating glass that minimizes solar heat gain, blocks UV rays, reduces noise, etc. This glass also allows you to cut back on (or do away with) other building components, such as air conditioning, perimeter heating, etc.

Calculating energy efficiency in terms of glass is more meaningful when it’s seen as part of an integrated, holistic approach. When you’re evaluating energy efficiency, comfort, and emissions, windows should be viewed as part of all other building components – part of an integrated system.

 


Visit our website today to learn about the design flexibility of a Morton building and the endless possibilities of partnering with our designBUILD team.


Wood construction is both cost and energy efficient. Check out Morton Buildings and our designBUILD team online today to discover all the benefits of post-frame construction.


When choosing a metal-clad building for your next construction project, consider Morton Buildings, Inc., and their designBUILD team, we’ll make your dream a reality.

We Can Help You Reduce Energy by 30%

Our mission is to help our customers manage their buildings' energy costs, improve reliability, and enhance performance while having a positive impact on the environment.
CLICK HERE to find out how.

Add highly responsive multi-zone comfort to any building project, in any climate. Our CITY MULTI H2i R2- and Y-Series VRF systems give you flexibility to fit the needs of any building. Enjoy 100% heating capacity at 0°F outdoor ambient, and 85% heating capacity at -13°F outdoor ambient.  For more information, log on to www.mitsubishipro.com


Visit our website today to learn about the design flexibility of a Morton building and the endless possibilities of partnering with our designBUILD team.


Wood construction is both cost and energy efficient. Check out Morton Buildings and our designBUILD team online today to discover all the benefits of post-frame construction.


When choosing a metal-clad building for your next construction project, consider Morton Buildings, Inc., and their designBUILD team, we’ll make your dream a reality.

We Can Help You Reduce Energy by 30%

Our mission is to help our customers manage their buildings' energy costs, improve reliability, and enhance performance while having a positive impact on the environment.
CLICK HERE to find out how.

Add highly responsive multi-zone comfort to any building project, in any climate. Our CITY MULTI H2i R2- and Y-Series VRF systems give you flexibility to fit the needs of any building. Enjoy 100% heating capacity at 0°F outdoor ambient, and 85% heating capacity at -13°F outdoor ambient.  For more information, log on to www.mitsubishipro.com

 
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