promoting energy efficiency standards and technologies for windows
DESCRIPTION
Buildings and Utilities Project Manager Nils Petermann ([email protected]) presented specific Alliance experience in windows market transformation through the Efficient Windows Collaborative (EWC). Nils directs the EWC, and his expertise includes window energy efficiency standards and technologies as well as analysis of the energy savings achievable through building codes.TRANSCRIPT
Promoting Energy Efficiency Standards Promoting Energy Efficiency Standards and Technologies for Windowsand Technologies for Windows
Promoting Energy Efficiency Standards Promoting Energy Efficiency Standards and Technologies for Windowsand Technologies for Windows
February 23, 2010
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www.efficientwindows.org / www.commercialwindows.org
Nils [email protected]
Alliance to Save Energywww.ase.org
The Impact of Window PerformanceThe Impact of Window PerformanceThe Impact of Window PerformanceThe Impact of Window Performance
In the United States, about 23% of heating energy use and about 34% of cooling energy use is due to windows.
With current, cost-effective
2
With current, cost-effective technologies, about half of this energy use can be saved.
Source: Lawrence Berkeley National Laboratory
2Source: U.S. Department of Energy
What Makes an EnergyWhat Makes an Energy--Efficient Window?Efficient Window?What Makes an EnergyWhat Makes an Energy--Efficient Window?Efficient Window?
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Warm-edge spacers
Gas fill
Low-E coating
$0 $200 $400 $600 $800
$0 $200 $400 $600 $800
Window Energy ParametersWindow Energy Parameters
U-Factor Visible Transmittance (VT)
Heat Transfer Daylight Access
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Solar Heat Gain Coefficient
(SHGC)
Air Leakage (AL)
Solar Heat Gain Infiltration
The Information Source for Window Energy Properties:The NFRC Label
The Information Source for Window Energy Properties:The NFRC Label
The National Fenestration Rating Council (NFRC) has established a voluntary national energy performance rating and labeling system
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energy performance rating and labeling system for fenestration products.
NFRC ratings show the complete aggregated performance of the whole product, including:
• frame• glazing• spacer
The NFRC Label is the Basis for Energy The NFRC Label is the Basis for Energy Code Compliance and ENERGY STARCode Compliance and ENERGY STARThe NFRC Label is the Basis for Energy The NFRC Label is the Basis for Energy Code Compliance and ENERGY STARCode Compliance and ENERGY STAR
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The Efficient Windows CollaborativeThe Efficient Windows CollaborativeThe Efficient Windows CollaborativeThe Efficient Windows Collaborative
Residential Windows Infowww.efficientwindows.org
Help with sorting through the complexities of window performance
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The Efficient Windows CollaborativeThe Efficient Windows CollaborativeThe Efficient Windows CollaborativeThe Efficient Windows Collaborative
Commercial Windows Info www.commercialwindows.org
Help with sorting through the complexities of window performance
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Thank YouThank YouThank YouThank You
Nils PetermannAlliance to Save Energy
(202) [email protected]
Kerry HaglundUniversity of Minnesota
(612) 626-9478
John CarmodyUniversity of Minnesota
Steve SelkowitzLBNL
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(612) [email protected] Dariush Arasteh
www.efficientwindows.orgwww.commercialwindows.umn.edu