Solar Canopy Illumination System Technical slides supplementing the DVD

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Solar Canopy Illumination SystemTechnical slides
supplementing the DVD
Explanatory texts for each slide can be found in
the Notes section within this presentation. To
view the Notes, just right click on the screen
and select "edit slides
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Goal of the Solar Canopy Illumination System

• To establish feasibility and cost-effectiveness
  of core daylighting for standard multi-floor
  buildings
• Not expecting to address every type of building,
  but system could be used in many standard office
  towers

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Solar Canopy Illumination System
Solar canopies mounted on the south-facing wall
of a multi-storey building guide sunlight into
prism light guides
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Design of the Solar Canopy System
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The ABA mirrors
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Side View Of ABA Mirrors Showing Redirection Of
Sunlight
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Representation of Individual Mirror Movement
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Sun Overhead in Winter
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Reference Position
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Sun Overhead in Summer
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Reference Position
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Sun East of Canopy
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Reference Position
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Sun West of Canopy
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Cross Section of Dual-Function Prism Light Guide
(Not to Scale)
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Floor plan Of The Portable Test Facility
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Solar Canopy Portable Test Facility
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Visualizing the Canopies on a Multi-Storey
Building
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Workspace Illumination Measurements in the
Portable Test Facility

• Illumination Scenarios
• Electric Lighting only
• Daylight entering through the window only
• Daylight entering through the light guide only
• Daylight entering through window and light guide

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UBC Solar Canopy Illumination System
Illumination condition Weather cloudy Light
source window
Window Covered
Window Uncovered
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UBC Solar Canopy Illumination System
Illumination condition Weather cloudy Light
source light guide
Window Covered
Window Uncovered
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UBC Solar Canopy Illumination System
Illumination condition Weather cloudy Light
source electric
Window Covered
Window Uncovered
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UBC Solar Canopy Illumination System
Illumination condition Weather sunny Light
source light guide
Window Covered
Window Uncovered
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UBC Solar Canopy Illumination System
Illumination condition Weather sunny Light
source window
Window Covered
Window Uncovered
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Illuminance Distribution Daylight entering
through the window only
June 17th, 1244 TLT
overcast
Average Illuminance 223 lx
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Illuminance Distribution Daylight entering
through the window only
June 18th, 1305 TLT
sunny
Average Illuminance 388 lx
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Illuminance DistributionElectric Lighting Only
Dimming Level 40 Average Illuminance 552
lx
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Illuminance Distribution Daylight entering
through the light guide only
June 16th, 1259 TLT
sunny
Average Illuminance 742 lx
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Illuminance Distribution Daylight entering
through the light guide only
September 6th, 1330 TLT
sunny
Average Illuminance 583 lx
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Illuminance Distribution Daylight entering
through the light guide only
October 4th, 1300 TLT
sunny
Average Illuminance 511 lx
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Benefits of Hybridization

• Energy saving features
• Provides shade for the windows
• Collected heat can be conducted inside or
  rejected
• Protection for low-cost photovoltaic cells
• Dual-function light guide provides supplementary
  electric lighting
• Hybridized features enable a cost-effective
  system.

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Cost Benefit Analysis

• System cost
• Because of hybridization, partial system cost
  paid for by other aspects of the building
• Dedicated solar lighting elements in system are
  the adaptive butterfly array, its control system,
  the concentrating mirrors and the prism light
  guide films
• Cost effective purely in terms of energy savings

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Cost Benefit Analysis

• Human factors could provide additional benefits
• Glare reduction
• Contact with outdoors
• Color rendering
• We are not attempting to quantify these at this
  time, although others are doing so

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A Cost-Effective Solution for Core Daylighting
in Office Buildings