OPTIMIZING DAYLIGHTING
STRATEGIES
PRESENTED BY:Sandy Houck, LEED AP, LC
August 18, 2011
Improving the performance and value of your buildings
GOALS MAKE DAYLIGHTING A PRIORITY IN DESIGN
START EARLY IN THE DESIGN PROCESS
PROVIDE AUTOMATIC DAYLIGHTING CONTROLS
PROVIDE COMMISSIONING & EDUCATE OCCUPANTS
DAYLIGHTING FOR
TASK-ORIENTED SPACES
PHO
TOCR
EDIT
: S
QU
ARE1
SUNLIT SPACE DAYLIT SPACE
WHAT WE DON’T WANT TO CREATE…
A SAUNA WHERE PEOPLE HAVE TO WORK
PHOTO CREDIT: DAYLIGHTING COLLABORATIVE
IT’S NOT EFFECTIVE
DAYLIGHT UNLESS THE
ELECTRIC LIGHTS
ARE OFF.
WHAT WE DON’T WANT TO CREATE…
A DOUBLE-LIT SPACE
DAYLIGHT AVAILABILITY
SOURCE: ILLUMINATING ENGINEERING SOCIETY NORTH AMERICA
DIRECT SUN
DIFFUSE SKY LIGHT
REFLECTED LIGHT
AESTHETIC QUALITIES OF DAYLIGHTING
DAYLIGHT IS DYNAMIC
FULL SPECTRUM
PHOTO CREDIT: GREENSOURCE MAGAZINE
PHOTO CREDIT: LRC DAYLIGHTING DIVIDENDS
ENERGY EFFICIENT QUALITIES OFDAYLIGHTING
SOURCE: HIGH TECH HIGH CHULA VISTA
EFFICACY OF LIGHT SOURCE (LUMENS/WATT) INCANDESCENT (16-40 LUMENS/WATT) FLUORESCENT (90-100 LUMENS/WATT) DIFFUSE SKY LIGHT (125-150 LUMENS/WATT)
BEST BUILDING FOOTPRINTS FORDAYLIGHTING
IESNA RP-5
LONG AND NARROWFOOTPRINT
ORIENT LONG AXISRUNNING EAST/WEST
HIGH PERCENT OFPERIMETER AREA
SOURCE: IESNA
ONE-STORYBUILDINGS
TOP FLOOR OFMULTI-STORYBUILDINGS
REPRESENTS
~60% OFCOMMERCIAL
FLOOR SPACE
TOPLIGHTING-OPENINGS IN THE ROOF PLANE-
CHAPARRAL HIGH SCHOOL
SAWTOOTHS, MONITORS & CLERESTORIES
DELIVERS DAYLIGHTDEEPER INTO SPACE
ORIENTATION HASAN IMPACT
CLEAR GLAZING(WHEN NORTH-FACING)
MORE CHALLENGINGTO DARKEN SPACE
SOURCE: VELUX
3% - 5% SKYLIGHT
TOFLOORAREARATIO
SKYLIGHTS
SOURCE: SOLATUBE
TUBULAR DAYLIGHTING DEVICES
USEFUL ON ANY LEVEL OFA BUILDING
PHOTO CREDIT: KALWALL
PHOTO CREDIT: LRC DAYLIGHT DIVIDENDS
SIDELIGHTING -VERTICAL GLAZING-
SIDELIGHTING GLAZING LOCATIONS
EXAMPLE BUILDING IN LOS ANGELES
HIGH PERFORMANCE GLAZING
Visible Light Transmittance (VLT) Solar Heat Gain Coefficient (SHGC)
SOURCE: PPG
HIGH PERFORMANCE GLAZING
LIGHT TO SOLAR GAIN FACTOR
LSG FACTOR = VLT/SHGC
SOURCE: PPG
IMPORTANCE OF TYPE & SIZEOF GLAZING
EXTERIOR SHADING STRATEGIES
NORTHERN HEMISPHERE
OVERHANGS (SOUTH)
SAN DIEGO CLIMATE – ALSO CONSIDER SHADING ATEQUINOX (SEPTEMBER 21)
SOURCE: WHOLE BUILDING DESIGN GUIDE
SOURCE: ILLUMINATING ENGINEERING SOCIETY NORTH AMERICA
FINS (EAST & WEST)
EXTERIOR SHADING STRATEGIES
SCREEN
SOURCE: NY TIMES BUILDING
SOURCE: NY TIMES BUILDING
EXTERIOR SHADING STRATEGIES
WATER LIFE MUSEUM, HEMET
SAN ELIJO LAGOON VISITOR’S CENTER
LIGHT SHELF (SOUTH)
Photo
Cre
dit:
Ash
Cre
ek
Ele
men
tary
, M
onm
outh
, O
R b
y BO
ORA A
rchitec
ts
SOURCE: ADVANCED LIGHTING GUIDELINES
INTERIOR SHADING STRATEGIES
Photo Credit: MechoShade
VIEW-PRESERVING
FABRIC SHADES
INTERIOR SHADING STRATEGIES
ARCHITECTS HANNAH GABRIEL WELLS HEADQUARTERS
BLACKOUT FABRIC SHADES
ARCHITECTS HANNAH GABRIEL WELLS HEADQUARTERS
INTERIOR SHADING STRATEGIES
BLINDS
(NOTICE SEPARATE
CONTROL OF VIEW &DAYLIGHT SECTION OF
WINDOW)
INTERIOR SHADING STRATEGIES
HORIZONTAL BLINDS
(SOUTH FAÇADE)
VERTICAL BLINDS
(EAST & WEST FAÇADE)
INTERIOR DESIGN TO OPTIMIZEDAYLIGHTING
LIGHT-COLORED SURFACES
AVOID ‘CAVE’ EFFECT WITHLIGHT-COLORED CEILING
DESIGN ELECTRIC LIGHTING FORDAYLIT SPACES
TASK/AMBIENTDESIGN
DIRECT/INDIRECTLIGHTING
ORIENT PARALLEL TOWINDOW
LAMP COLORTEMPERATURE
(MIN. 4100K)
ZONE ELECTRIC LIGHTING FOR
DAYLIGHT RESPONSIVE CONTROL
IESNA RP-5
THE NEED FOR AUTOMATIC CONTROLS
PROVIDE DAYLIGHT RESPONSIVECONTROLS FOR ELECTRIC LIGHTING
Credit: LC&D, Lutron & WattStopper
COMMISSIONING & MAINTENANCE
OF
AUTOMATIC CONTROLS
SAN ELIJO LAGOON VISITOR’S CENTER
COMMISSIONING & MAINTENANCE OF AUTOMATIC CONTROLS
NOT A DAYLIT SPACE . . . YET
A DAYLIT SPACE
TITLE 24 2008 & DAYLIGHTING
SIDELIGHTING
SO
URCE:
CA T
ITLE
24 N
ON
RES M
AN
UAL
TITLE 24 2008 - DAYLIT ZONES
TOPLIGHTING
SO
URCE:
CA T
ITLE
24 N
ON
RES M
AN
UAL
TITLE 24 2008 - DAYLIT ZONES
TITLE 24 2008 – CONTROL CREDITS
LEED & DAYLIGHTING
INDOOR ENVIRONMENTAL QUALITY CATEGORY
IEQC8.1 – DAYLIGHT
-PROVIDE ADEQUATE DAYLIGHT FOR 75% OFREGULARLY OCCUPIED SPACES
MED IMPACT – LEED GOLD CERTIFIED
SDCCD WEST CITY CENTER – LEED GOLD CERTIFIED
LEED DAYLIGHT CREDIT IEQC8.1
CALCULATION METHODS
LEED v2
Option 1
Glazing Factor Calculation
Option 2
Daylight Simulation
Model
Option 3
Daylight Measurement
LEED v3
Option 1
Simulation
Option 2
Prescriptive
Option 3
Measurement
Option 4
Combination
LEED DAYLIGHT CREDIT IEQC8.1
PRESCRIPTIVE CALCULATIONS
LEED v2
Option 1
Glazing Factor Calculation
Option 2
Daylight Simulation
Model
Option 3
Daylight Measurement
LEED v3
Option 1
Simulation
Option 2
Prescriptive
Option 3
Measurement
Option 4
Combination
V2.2
ACHIEVE A MINIMUM 2% GLAZING FACTOR IN ATLEAST 75% OF ALLREGULARLY OCCUPIEDSPACES.
RELATIVELY EASY TOCOMPLY
BASED ON GEOMETRY & GLAZING VLT ONLY
V3 (2009)
FORMULA BASED ON
GEOMETRY AND
GLAZING VLT
ACHIEVABLE IN
VERY LIMITED
TYPES OF SPACES
LEED PRESCRIPTIVE CALCULATIONS
LEED v2
Option 1
Glazing Factor Calculation
Option 2
Daylight Simulation
Model
Option 3
Daylight Measurement
LEED v3
Option 1
Simulation
Option 2
Prescriptive
Option 3
Measurement
Option 4
Combination
LEED DAYLIGHT CREDIT IEQC8.1
PERFORMANCE CALCULATIONS
V2.2
COMPUTER SIMULATIONNOON ON EQUINOX
(SEPT. 21)
MINIMUM ILLUMINANCE25FC
V3 (2009)
COMPUTER SIMULATION
9AM AND 3PM ONEQUINOX
(SEPT. 21)
10FC < ILLUMINANCE < 500FC
LEED PERFORMANCE CALCULATIONS
TOP 4 THINGS TO REMEMBER . . .
1. MAKE DAYLIGHTING A PRIORITY IN YOUR PROJECT
2. START EARLY IN THE DESIGN
3. PROVIDE AUTOMATIC DAYLIGHTING CONTROLS
4. COMMISSION THE SYSTEM & EDUCATE THE USERS
OPTIMIZING DAYLIGHTING STRATEGIES
PRESENTED BY:
Sandy Houck, LEED AP, [email protected]
August 18, 2011
BRUMMITT ENERGY ASSOCIATES , INC .Helping people achieve very energy efficient buildings
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