Daylighting Buildings Buildings Nexus | November 12, 2009 Case Study Using Daylight Metrics Case...
Transcript of Daylighting Buildings Buildings Nexus | November 12, 2009 Case Study Using Daylight Metrics Case...
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Daylighting BuildingsNexus | November 12, 2009
Holly Wasilowski, Registered Architect, LEED AP
Doctor of Design Student in Sustainable Design Harvard Graduate School of Design
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Daylighting Buildings
Nexus | November 12, 2009
Agenda:
Introduction
Rules of Thumb
Metrics
Case Study Using Metrics
Software Overview
Daylighting and LEED
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Introduction
What is daylighting?
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What are some of the potential benefits of
daylighting?
Introduction
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What are some of the potential benefits of
daylighting?
reduced electric lighting load
reduced internal gains
reduced cooling loads
improved lighting conditions
color rendition
color temperature
“sparkle”
occupant satisfaction
occupant comfort
reduced cooling loads
connection to nature
time orientation
health: circadian rhythms…
etc.
Introduction
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What are some of the potential drawbacks of
daylighting?
Introduction
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What are some of the potential drawbacks of
daylighting?
increased heat gains
increased cooling loads
glare!
increased electric lighting load – how?
functional interference (example: projectors)
More is not always better.
Introduction
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Some Resources
Heating, Cooling,
Lighting –
Norbert Lechner
Sun, Wind &
Light – Brown
and DeKay
Environmental
Control Systems
– Fuller Moore
Green Studio
Handbook
- Kwok and
Grondzik
Introduction
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Rules of Thumb
For other Rules of Thumb and Tutorials Go to:www.gsd.harvard.edu/research/gsdsquare/tutorials.html
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Rules of Thumb
Daylighting Buildings
Nexus | November 12, 2009
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Rules of Thumb
Sun angles
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Rules of Thumb
Sun angles
Opinion poll: Would you rather have your office
window facing north, south, east, or west?
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Rules of Thumb
Sun angles
Opinion poll: Would you rather have your office
window facing north, south, east, or west?
What about your bedroom?
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Rules of Thumb
Sun angles
Opinion poll: Would you rather have your office
window facing north, south, east, or west?
What about your bedroom?
Would you rather have your outdoor swimming pool on
the north, south, east, or west of your Boston
apartment building?
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Rules of Thumb
Sun angles
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Rules of Thumb
Sun angles
Quiz question:
Does an east-facing surface in Boston receive more
solar radiation in the summer or the winter?
A horizontal surface?
A south-facing surface?
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Rules of Thumb
Sun angles
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Rules of Thumb
Sun angles
VS.
south
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Rules of Thumb
Building orientation: north/south +/- 15 degrees
Carmax Headquarters by ADD Inc
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Rules of Thumb
Façade Design and Building Massing
Carmax Headquarters by ADD Inc
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Rules of Thumb
External Shading
Why is EXTERNAL shading so important?
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Rules of Thumb
External Shading
Why is EXTERNAL shading so important?
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Rules of Thumb
Lighting Controls and Interior Design
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Rules of Thumb
Lighting Controls and Interior Design
Interior light shelf
photosensors
zoning of electric
lighting
reflective colors
low/translucent
partitions
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Rules of Thumb
Some definitions
Illuminance
Luminance
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Rules of Thumb
Some definitions
Illuminance Units: lux
(SI), footcandles (IP)
(1 fc = about 11 lux)*
Luminance Units:
candela/m2 (SI),
candela/ft2 (IP)(1 candela/ft2 = about 11
candela/m2)*
*Use a conversion
factor of 10 today, for
convenience.
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Rules of Thumb
Falsecolor Luminance Image from Radiance
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Rules of Thumb
Illuminance Image from Ecotect(calculations performed in Radiance)
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Rules of Thumb
What are some typical light levels?
Office:
Classroom:
Parking lot at night:
Overcast day outside:
Sunny day outside:
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Rules of Thumb
What are some typical light levels?
Office: 50 fc, 500 lux
Classroom: 30 fc, 300 lux
Parking lot at night: 1 fc, 10 lux
Overcast day outside: 1500 fc, 15,000 lux
Sunny day outside: 8000 fc, 80,000 lux
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Rules of Thumb
Illuminance meter
$60 to $500 +/-
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Rules of Thumb
Glare
direct glare
discomfort glare -
physical discomfort
disability glare – reduced
visual performance
indirect glare
veiling reflections
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Rules of Thumb
Maximum Recommended Brightness Ratios for
Indoor Lighting1
1 From Heating, Cooling, Lighting, Lechner 2009
Ratio Areas Example
3:1 Task to immediate
surroundings
Book to desk top
5:1 Task to general
surroundings
Book to nearby
partitions
10:1 Task to remote
surroundings
Book to remote wall
20:1 Light source to large
adjacent area
Window to adjacent
wall
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Rules of Thumb
Maximum Recommended Luminance Ratios for
Indoor Lighting1
1 From Heating, Cooling, Lighting, Lechner 2009
Ratio Areas Example
3:1 Task to immediate
surroundings
Book to desk top
5:1 Task to general
surroundings
Book to nearby
partitions
10:1 Task to remote
surroundings
Book to remote wall
20:1 Light source to large
adjacent area
Window to adjacent
wall
What is wrong with these rules of thumb for daylighting?
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Rules of Thumb
A Glare Study
Classroom renderings from Radiance
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Rules of Thumb
A Study of Contrast Ratios in a Daylit Space
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Rules of Thumb
A Study of Contrast Ratios in a Daylit Space
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Rules of Thumb
Daylight Penetration
X
How far can daylight
penetrate into a space?
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Rules of Thumb
Daylight Penetration1
1 From Christoph Reinhart, Harvard Graduate School of Design 2009
In a sidelit space with a standard window and
venetian blinds, the depth of the daylit area usually
lies between 1.5 and 2 time the window-head-
height. If a space does not require the use of a
shading device the ratio can increase up to 2.5.
X
1.5X 2 X 2.5 X
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Rules of Thumb
For other Rules of Thumb and Tutorials Go to:www.gsd.harvard.edu/research/gsdsquare/tutorials.html
Current Tutorials:
Daylighting Rules of Thumb
Getting Started with Ecotect/Radiance/Daysim
From Rhinoceros to Ecotect
Getting Started with DesignBuilder/EnergyPlus
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Daylighting Metrics
Daylighting Buildings
Nexus | November 12, 2009
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Daylighting Metrics
Daylight Factor (DF)
Ratio of Outside
Illuminance to Inside
Illuminance
DF = 100 * Ein / Eext
From: www.learn.londonmet.ac.uk/packages/clear/visual/daylight/analysis/hand/daylight_factor.html
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Daylighting Metrics
Daylight Factor (DF)
Widely used metric
Easy to understand
2% or 5% DF are 2 common thresholds for
daylighting
Limitations:
Overcast sky only!!!
More is not always better
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Daylight Factor Image in Ecotect(Calculations Performed in Radiance)
Daylighting Metrics
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Daylighting Metrics
Dynamic Climate Responsive Daylight Metrics
Consider daylight over a period of time, such as
a year
Use actual occupied hours
Use actual climate conditions
TMY weather files
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Daylighting Metrics
Daylight Autonomy (DA)
Percentage of working hours when a minimum
work plane illuminance (example, 300 lux or 28
fc) is maintained by daylight alone
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Daylighting Metrics
Useful Daylight Illuminance (UDI)
Divides working hours into three bins:
% < 100 lux (insufficient daylight)
% between 100 lux (9.2 fc) and 2000 lux (186 fc)
(useful daylight)
% > 2000 lux (186 fc) (too much daylight)
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A Case Study Using Daylighting Metrics
Daylighting Buildings
Nexus | November 12, 2009
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Case Study Using Daylight Metrics
Case Study
Academic Building in Northern Kentucky
West-facing Laboratories
South-facing Classrooms
East-facing Offices
Comparing Design Alternatives for Each
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Case Study Using Daylight Metrics
Case Study Variant A: “No Shade” Same as
E but without sun shelf.
Variant B: “Different Glass”
60% visible transmittance rather
than 72%
Variant C: “Horizontal Louvers”
6” deep louvers at 6” O.C. for
portion of windows above 7’
Variant D: “Interior/Exterior
Shelf” 24” exterior shelf plus 36”
interior shelf at 10’
Variant E: “As Designed” 3’ or
7’ sill, 12’-6” head, 24” deep
exterior sun shelf at 10’
AB
C
D
E
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Case Study Using Daylight Metrics
Case Study: Daylight Autonomy (DA)
A
B
C
D
E
Here all the variants show that there
is plenty of daylight in the space.
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Case Study Using Daylight Metrics
Case Study: Useful Daylight Index (UDI)
A
B
C
D
E
The UDI for all 5 variants indicates that glare
control near the windows is a concern. Variant B
shows that glass with less visible transmittance is
actually beneficial from a daylighting perspective.
This would allow for a lower solar heat gain
coefficient, which would be beneficial from an
energy stand-point as well.
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Case Study Using Daylight Metrics
Case Study: Direct Shading Studies
South-Facing Classroom: June 21, noon
South-Facing Classroom: March 21, noon
South-Facing Classroom: Dec 21, noon
The louvers of variant C and the deep
lightshelf of variant D help control
glare; however, interior blinds will be
needed during low sun-angles for
each of the current variants.
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Case Study Using Daylight Metrics
Case Study: Conclusions
The classroom receives plenty of daylight. If the window sizes could
be reduced it would likely be beneficial from an energy stand-point
as well as cost. The lower glazing provides the least lighting benefit
but the best view.
Use photo-controlled dimmers throughout the space. Zone
perimeter space separately if possible.
A glass that provides more shade is recommended for this space.
Consider 0.6 visible transmittance or higher and 0.35 shading
coefficient or lower (instead of 0.7 and 0.43 respectively.)
Add an interior sun shelf if possible or consider horizontal louvers.
Provide as much depth as feasible for the shading devices.
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Software Overview
Daylighting Buildings
Nexus | November 12, 2009
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Software Overview:
Direct Shading
Solar Position
Static Simulations
Dynamic Simulations
Glare Probability
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Software Overview
Direct Shading:
SketchUp, Ecotect…
Any other 3D modeling program in which you
can accurately set:
Your location (longitude/latitude or city)
Your orientation (face your building the
right direction)
And the time of day and year
And which accurately positions the sun
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Software Overview
Solar Position:
Climate Consultant (freeware)
http://www.energy-design-tools.aud.ucla.edu/
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Software Overview
Solar Position:
Ecotect / Ecotect Weather Tool
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Software Overview
Radiance:
Accurate, physically-based renderings
Static (one moment in time) Calculations
Luminance values
Illuminance values
Freeware:
http://radsite.lbl.gov/radiance/download.html
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Software Overview
Radiance Rendering
From: www.artifice.com/radiance.html
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Software Overview
Radiance Illuminance Images
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Exporting to Radiance in Ecotect
Software Overview
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Radiance Calculations Visualized in Ecotect
Software Overview
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Software Overview
Daysim:
Dynamic, Climate-Based Calculations
UDI
DA
Uses Radiance Engine
Can Model Blind Operations
Freeware: http://www.nrc-
cnrc.gc.ca/eng/projects/irc/daysim/versions.html
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The Daysim GUI
Software Overview
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Software Overview
Evalglare: For Calculating Glare Probability
A classroom rendering in Radiance
A glare study in Evalglare
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Software Overview
Evalglare: For Calculating Glare Probability
http://www.sbi.dk/download/pdf/Evalglare.pdf
Freeware (Site in German. Look for evalglare v0.9f –
Windows Version in lower right)
http://www.ise.fhg.de/radiance
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Daylighting and LEED
Daylighting Buildings
Nexus | November 12, 2009
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Daylighting and LEED
LEED 2009 IEQ Credit 8.1
75% of Occupied Spaces Daylit = 1 point
90% of Occupied Spaces Daylit = 2 points
Option 1: Simulation
Option 2: Prescriptive
Option 3: Measurement
Option 4: Combination
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Daylighting and LEED
Option 1 Simulation
To qualify as daylit, space
must meet a minimum of 25
fc and max of 500 fc on
September 21 at 9am and
3pm under clear skies
Automated shades exempt
you from the maximum
illuminance limitations
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Daylighting and LEED
Option 2 Prescriptive
To qualify as daylit, the visible light transmittance (VLT)
times the window-to-floor area ratio (WFR) must be
between 0.150 and 0.180
And the space must meet this ceiling height
requirement…
0.150 < VLT X WFR < 0.180
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Daylighting and LEED
Option 2 Prescriptive
0.150 > VLT X WFR < 0.180
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Daylighting and LEED
Option 3 Measurement
To qualify as daylit, space must meet a minimum of
25 fc measured on a 10 foot grid
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Daylighting and LEED
Option 3 Combination
To qualify as daylit, each space
must meet one of the methods
described above
In all cases (Options 1-4)
provide glare control
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Questions?
Daylighting Buildings
Nexus | November 12, 2009