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LOW-E

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GLASS WEST WE COME TO YOU                         10 MOBILE SHOPS TO FIX YOUR WINDOWS, SCREENS, SCREEN DOORS, ENTRANCE DOORS, MIRRORS AND ALL YOUR GLASS NEEDS                                        Email us at - glasswest.com or call us at 1-800-U-4-GLASS

Electronic mail:
Sales: Dave Blake daveblake@glasswest.com
 

 

 

Low-E GlassSafeco Field in Seattle, WA


 

 

 

 

Low-E glass improves thermal performance and reduces solar heat gain in residential and commercial glazing applications compared to standard uncoated glass units.


 

Winter Time

Conference rooms gain comfort through Low-E glass performance

Text Box: The sun's energy is "SHORT WAVE RADIATION" which passes through the window and is absorbed by carpet, furniture, etc. The energy is then transformed into long wave radiation. The long wave radiation wants to flow from warm to cool. Naturally, it will try to escape from the glass. At night the radiant heat produced from furnaces, wood stoves, etc., will also want to escape out through the glazing. The Low-E coating prevents this when the radiant room-side heat is reflected back into the building. This results in a lower winter U-value. For winter comfort, the higher the indoor glass temperature, the better the product is for comfort.

 

 

 

 

 

 

 

 

 

 



 

Text Box: The Low-E coating manages the sun's heat in the summer by reducing the amount of heat transferred through the window in the summer. The Low-E coating filters the sun's short-wave radiation, which cuts down on the amount of solar heat gain into your building. For summer comfort, the lower the indoor glass temperature, the better the product is for comfort.  

 


Washington Convention Center, downtown Seattle

Summer Time

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 




 

How Low-E Works





 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Text Box: 1. The Low-E allows most natural light to enter freely, but reflects a significant portion of long and short wave heat energy.   2. In the summer, long-wave heat energy radiating from objects is reflected back outside, lowering cooling cost.   3. In winter, internal long-wave heat energy is reflected back inside, lowering heating cost.  

Hard Coat vs. Soft Coat Low-E


Low-E glass is available in two basic types, hard coat or soft coat.
 

Santa Clara Police Department, evergreen eclipse glass over Hard-Coat Low-E Hard Coat Low-E
Hard coat Low-E, or pyrolytic coating, is a coating applied at high temperatures and is sprayed onto the glass surface during the float glass process.

 

 

 

Advantages

The advantage is that the coating is relatively durable, which allows for ease of handling and tempering.
 

bulletCan be tempered after coating application
 
bulletCan be used in single glazing applications.
 
bulletUtilizes passive solar heat gain.

Disadvantages

  • Higher U-values compared to soft coat Low-E products
     
  • Slightly higher haze levels
     
  • Higher solar heat gain coefficient compared to soft coat Low-E products.


 

 

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Napa Food, Art and Wine Center, Napa, CA Soft Coat Low-E
 

Soft coat Low-E, or sputter coating, is applied in multiple layers of optically transparent silver sandwiched between layers of metal oxide in a vacuum chamber. This process provides the highest level of performance and a nearly invisible coating.

 


 

Advantages

  • High visible light transmission
     
  • Ultra-low emissivities giving optimum winter U-values
     
  • Up to 70% less UV transmission compared with standard clear glazing
     
  • Optical clarity - minimal color haze


 

Disadvantages

  • Soft coat Low-E must be used in a double glazed unit; the soft coating is sensitive to handling.
     
  • Most soft coat Low-E products require tempering the glass prior to the coating application.
     
  • Edge deletion of the coating is required to insure a proper seal in an insulated unit
     
  • There can be slight color variations of coating.

 

 

 

SPECIFICATIONS

 

Performance values calculated using Windows5 from LBNL.

 Insulated Unit Performance Data                                                      1/4" Clear over 1/4" Clear w/ 1" OA, Air Filled

Low E Coating U-Value Shading Coefficient SHGC Visible Light Transmittance
TI-AC 36 on #2 0.29 0.41 0.36 65%
TI-AC 36 on #3 0.29 0.51 0.44 65%
Cardinal 172/Q4 on #2 0.29 0.46 0.40 69%
Cardinal 172/Q4 on #3 0.29 0.54 0.47 69%
Cardinal 140 on #2 0.30 0.29 0.25 37%
Cardinal 140 on #3 0.30 0.54 0.47 37%
Energy Advantage on #2 0.33 0.71 0.62 73%
Energy Advantage on #3 0.33 0.77 0.66 73%
Solar E on #2 0.33 0.53 0.46 54%
Solar E on #3 0.33 0.72 0.63 54%
Sungate 500 on #2 0.35 0.71 0.62 73%
Sungate 500 on #3 0.35 0.76 0.66 73%
Solarban 60 on #2 0.29 0.44 0.38 69%
Solarban 60 on #3 0.29 0.53 0.46 69%
Solarban 80 on #2 0.29 0.28 0.24 47%
Solarban 80 on #3 0.29 0.34 0.29 47%

 

 

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