advanced window products – a key strategy to save energy, save money, and mitigate carbon
DESCRIPTION
Presentation by Marc LaFrance, U.S. Department of EnergyOn Thursday June 11th, the Alliance to Save Energy hosted a webinar for Alliance Associates and others interested in opportunities for window energy efficiency. Moderated by the Alliance’s Vice President for Programs Jeff Harris, speakers representing research, industry and low-income weatherization highlighted options that can minimize window heat loss far beyond common practice. The focus was on high-end R-5 window technologies, but lower-cost products, such as low-E storm windows, and the specific needs of low-income weatherization programs were also discussed. The five presenters’ different perspectives converged in the message that there is a great need for more energy-efficient windows and that advanced technologies and their integration in incentive and weatherization programs can bring far greater savings within reach.TRANSCRIPT
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Advanced Window Products – A Key Strategy to Save Energy, Save Money,
and Mitigate Carbon
June 11, 2009
P. Marc LaFrance, CEM
Technology Development Manager
Building Technology Program
Office of Energy Efficiency and Renewable Energy
US Department of Energy
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Facing our Energy Challenges
“The energy challenges our country faces are severe and have gone unaddressed for far too long. Our addiction to oil doesn’t just undermine our national security and wreak havoc on our environment – it cripples our economy and strains the budgets of working families all across America.”
White House Energy Statement
“We're using 19th and 20th century technologies to battle 21st century problems like climate change and energy security.”
Remarks of President Barack Obama, Signing of the American Recovery and Reinvestment Act, February 17, 2009
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Buildings40%
Transport28%
Industry32%
US Energy in Buildings
Total US Building Envelope Energy Loss:
14.1 quads (Windows ~ 4 quads)
14.1% of Energy in US Economy and about 3.5% of the world.
$133 Billion Annually
Electricity – 72% for Buildings
$370 Billion Annually
Natural Gas – 55% for Buildings
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Building Consumption – Window Relationship
Heating23%
Cooling13%
Lighting18%
Ventilation3%
Water Heating10%
Electronics7%
Appliances12%
Computers2%
Other12%
Consume about 10-15% of building energy
Have Impact on 57% of Loads
Building Technologies Goal
Net-Zero Energy Buildings by 2025
Net-Zero Energy Homes by 2020
Low incremental cost.
Capacity from Buildings for Transportation
Advanced windows save natural gas and electricity to free up capacity for bridging fuels.
Achievements: The Low-E Success Story
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• Transparent metal coating – Reflects heat back inside in winter– Reflects solar heat out in summer– Allows day light
• Reduces window energy by 30-65%.
• Very low cost
• Wide spread technology (60% of residential windows)
• Main attribute of code compliant windows
• Still needed for advanced windows
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2009-2010 Fenestration Tax Credit
• Raised limit for home improvements to $1500
• Increased to 30 percent of product cost
• Does not cover installation costs
• Removed individual caps on windows and doors
• Established U-factor and SHGC at 0.30 or less
• Took effect February 17, 2009
Window Technology Development
• Next generation window - highly insulating - dynamic solar control
• R10 future windows – possibly vacuum glazings
2006 Prototype – Concept Window (Highly Insulating and Dynamic
R 5.6 (U value 0.18), SHGC 0.04 – 0.34)Low cost unsealed center lite
USA, September 2008
Dynamic Windows – Now Market Ready
DOE Cooperative Agreement Prices will drop with greater production investment
See www.sage-ec.com for more information
Advanced Aluminum Framing
• Joint Project with DOE Cooperative Agreement
• An energy efficient window system able to meet both high performing energy, structural, safety and security values
• Low-E paint -- up to 14% improvement on window U-value
• Advanced thermal-break system, enhanced foam filling
Example: Triple Pane w/ Krypton
U value Center of Glass
U value Fixed Window
U value Casement
Traditional Thermal break 0.11 0.27 0.47
Advanced Frame 0.11 0.19 0.26
Percent Improvement 29% 43%
Visit TRACO’s website for more information at www.traco.com
The Potential Savings of New TechnologyExample: existing residential window stock
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Window Types
Energy use (quads) / savings potential (%)
Heating Cooling Total
2005 window stock (7% low-E)
1.30 0.94 2.24
2-pane, low-E 53% 46% 50%
3-pane, low-E 92% 47% 73%
R-10, dynamic solar control
115% 80% 100%
These estimates, based on 2006 LBNL simulations, do not take into account heating and cooling energy use due to infiltration.
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Windows Volume Purchase
www.R-5WindowsVolumePurchase.com
R5 and Low E Storm Volume Purchase
Develop Buyer Groups
Develop Draft RFP Specifications with Buyers and Possible
Manufacturer Bidders
Issue RFP
Make Awards for Purchasing Schedule
Promote Winner’s Products with Partners
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Oak Ridge National Laboratory / Building America Whole Building Demonstrations
• Highly Insulated R5 (U value 0.20) Window Demonstrations
• System affects – central ducts, reduced HVAC capacity, improved comfort
• Next project – highly insulating (>R5) and dynamic solar control, Serious Materials and Sage Electrochromics
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Key Conclusions
• DOE is working to develop the next generation of materials and products to achieve zero energy buildings
• R5 windows will be more economic for retrofit because labor cost are fixed -- marginal energy savings can be greater than marginal cost (compared to double pane low e)
• Low E storm windows may be viable where window replacement is not possible or viable
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Contact DataP. Marc LaFrance, CEM
US Department of Energy
1J-018, EE-2J
1000 Independence Ave, SW
Washington, DC 20585-0121
(202)–586–9142
www.govforums.org/e&w/
http://www.eere.energy.gov/buildings/