residential window energy use
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Residential Window Energy Use Residential Heating Energy Use of Windows is about 2 Quads / year Total energy consumption in US is about 100 Quads / year All Energy Star windows, still 1 Quad Goal: Zero Energy Windows Performance Goals Heating Climates:

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Presentation Transcript
residential window energy use
Residential Window Energy Use
  • Residential Heating Energy Use of Windows is about 2 Quads / year
  • Total energy consumption in US is about 100 Quads / year
  • All Energy Star windows, still 1 Quad
  • Goal: Zero Energy Windows
performance goals
Performance Goals

Heating Climates:

- static high solar, hi-R (U=0.1 Btu/h-ft2-F) can meet ZEH goals

- dynamic solar gain (.6

heat transfer in windows
Heat Transfer in Windows

Low-e coatings

Radiation

Conduction

Special gas fills

Multiple cavities

Convection

Low conductance spacers

Better frames

Conduction

background
low-e

low-e

2 sealed gas gaps at different temperatures and pressures

thin glass or plastic held by spacer

with standard glass, unit is thicker and heavier

spacer

only 2 paths for gas loss

Background
  • Vacuum windows, aerogels high-risk strategies
  • Current technologies for highly insulating products use multiple layers of low-e and gas fill
    • All glass is heavy
    • Thin film products expensive
    • Multiple spacers can lead to gas leakage
    • Market share is low (<1%)
  • This research aims to develop lower-cost, non-structural center layers
    • Utilize available low-e and gas-fill technologies
    • Research novel center layer designs and materials
prototypes
Prototypes
  • Utilize available low-e and gas-fill technologies
  • Research novel center layer designs and materials
  • Develop interests from industry partners who would supply new components

Bent edge insert prototype

alternative designs
Alternative Designs

Acrylic in Groove

Spec 6

Angled Acrylic

Spec 7

Two Layer Teflon

Spec 8

One Layer Teflon

Spec 13, 16

alternative designs7
Alternative Designs

Screen Insert

Spec 9,15

Acrylic Insert on standoffs

Spec 10, 17

Partial Triple

Spec 11

results
Results

Simple insert performs as well as fixed layer

angular selective center layers
Angular Selective Center Layers

High Angle summer sun blocked

Low Angle winter sun admitted

conclusions to date
Conclusions to Date
  • Possible to get very close to “net zero energy windows”
    • Climate based
    • No single, ideal, cost-effective window
  • Performance potentials of various insert materials studied
  • High-performance frames still necessary

Picture of a zh

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