Promoting Energy Efficiency Standards and Technologies for Windows

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Buildings and Utilities Project Manager Nils Petermann (npettermann@ase.org) presented specific Alliance experience in windows market transformation through the Efficient Windows Collaborative (EWC). …

Buildings and Utilities Project Manager Nils Petermann (npettermann@ase.org) 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.

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  • 1. Promoting Energy Efficiency Standards and Technologies for Windows February 23, 2010 Nils Petermann npetermann@ase.org Alliance to Save Energy www.ase.org www.efficientwindows.org / www.commercialwindows.org 1
  • 2. The 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 technologies, about half of this energy use can be saved. Source: Lawrence Berkeley National Laboratory Source: U.S. Department of Energy 2
  • 3. What Makes an Energy-Efficient Window? Energy- $0 $200 $400 $600 $800 Low-E coating $0 $200 $400 $600 $800 Gas fill Warm-edge spacers 3
  • 4. Window Energy Parameters Heat Transfer Daylight Access U-Factor Visible Transmittance (VT) Solar Heat Gain Infiltration Solar Heat Gain Air Leakage Coefficient (AL) (SHGC) 4
  • 5. 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 for fenestration products. NFRC ratings show the complete aggregated performance of the whole product, including: • frame • glazing • spacer 5
  • 6. The NFRC Label is the Basis for Energy Code Compliance and ENERGY STAR 6
  • 7. The Efficient Windows Collaborative Help with sorting through the complexities of window performance Residential Windows Info www.efficientwindows.org 7
  • 8. The Efficient Windows Collaborative Help with sorting through the complexities of window performance Commercial Windows Info www.commercialwindows.org 8
  • 9. Thank You Nils Petermann John Carmody Alliance to Save Energy University of Minnesota (202) 530-2254 carmo001@umn.edu npetermann@ase.org Steve Selkowitz Kerry Haglund LBNL University of Minnesota seselkowitz@lbl.gov (612) 626-9478 khaglund@umn.edu Dariush Arasteh LBNL d_arasteh@lbl.gov www.efficientwindows.org www.commercialwindows.umn.edu 9