This workshop will provide a general overview of daylighting strategies in commercial buildings, emphasizing the importance of integrating daylighting with energy-efficient lighting systems and controls. We will also explore how daylighting is achieved from a LEED standpoint and how CA's Title 24 addresses daylighting.
Sandy Houck, LC, LEED AP of Brummitt Energy Associates will present the benefits of daylighting strategies for your commercial project.
1. OPTIMIZING DAYLIGHTING
STRATEGIES
PRESENTED BY:
Sandy Houck, LEED AP, LC
August 18, 2011
Improving the performance and value of your buildings
2. GOALS
MAKE DAYLIGHTING A PRIORITY IN DESIGN
START EARLY IN THE DESIGN PROCESS
PROVIDE AUTOMATIC DAYLIGHTING CONTROLS
PROVIDE COMMISSIONING & EDUCATE OCCUPANTS
3. DAYLIGHTING FOR
TASK-ORIENTED SPACES
PHOTO CREDIT: SQUARE1
SUNLIT SPACE DAYLIT SPACE
4. WHAT WE DON’T WANT TO CREATE…
A SAUNA WHERE PEOPLE HAVE TO WORK
PHOTO CREDIT: DAYLIGHTING COLLABORATIVE
5. WHAT WE DON’T WANT TO CREATE…
A DOUBLE-LIT SPACE
IT’S NOT EFFECTIVE
DAYLIGHT UNLESS THE
ELECTRIC LIGHTS
ARE OFF.
6. DAYLIGHT AVAILABILITY
DIRECT SUN
DIFFUSE SKY LIGHT
REFLECTED LIGHT
SOURCE: ILLUMINATING ENGINEERING SOCIETY NORTH AMERICA
7. AESTHETIC QUALITIES OF DAYLIGHTING
DAYLIGHT IS DYNAMIC
FULL SPECTRUM
PHOTO CREDIT: GREENSOURCE MAGAZINE
PHOTO CREDIT: LRC DAYLIGHTING DIVIDENDS
8. ENERGY EFFICIENT QUALITIES OF
DAYLIGHTING
EFFICACY OF LIGHT SOURCE (LUMENS/WATT)
INCANDESCENT (16-40 LUMENS/WATT)
FLUORESCENT (90-100 LUMENS/WATT)
DIFFUSE SKY LIGHT (125-150 LUMENS/WATT)
SOURCE: HIGH TECH HIGH CHULA VISTA
9. BEST BUILDING FOOTPRINTS FOR
DAYLIGHTING
LONG AND NARROW
FOOTPRINT
ORIENT LONG AXIS
RUNNING EAST/WEST
HIGH PERCENT OF
PERIMETER AREA
IESNA RP-5
10. TOPLIGHTING
-OPENINGS IN THE ROOF PLANE-
ONE-STORY
BUILDINGS
TOP FLOOR OF
MULTI-STORY
BUILDINGS
REPRESENTS
~60% OF SOURCE: IESNA
COMMERCIAL
FLOOR SPACE
11. SAWTOOTHS, MONITORS &
CLERESTORIES
DELIVERS DAYLIGHT
DEEPER INTO SPACE
ORIENTATION HAS
AN IMPACT
CLEAR GLAZING
(WHEN NORTH-
FACING)
CHAPARRAL HIGH SCHOOL
MORE CHALLENGING
TO DARKEN SPACE
12. SKYLIGHTS
3% - 5%
SKYLIGHT
TO
FLOOR
AREA
RATIO
SOURCE: VELUX
29. INTERIOR DESIGN TO OPTIMIZE
DAYLIGHTING
LIGHT-COLORED SURFACES
AVOID ‘CAVE’ EFFECT WITH
LIGHT-COLORED CEILING
30. DESIGN ELECTRIC LIGHTING FOR
DAYLIT SPACES
TASK/AMBIENT
DESIGN
DIRECT/INDIRECT
LIGHTING
ORIENT PARALLEL TO
WINDOW
LAMP COLOR
TEMPERATURE
(MIN. 4100K)
45. LEED PRESCRIPTIVE CALCULATIONS
V2.2 V3 (2009)
ACHIEVE A MINIMUM 2% FORMULA BASED ON
GLAZING FACTOR IN AT GEOMETRY AND
LEAST 75% OF ALL
GLAZING VLT
REGULARLY OCCUPIED
SPACES.
ACHIEVABLE IN
VERY LIMITED
RELATIVELY EASY TO
COMPLY TYPES OF SPACES
BASED ON GEOMETRY &
GLAZING VLT ONLY
48. 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
49. OPTIMIZING DAYLIGHTING STRATEGIES
PRESENTED BY:
Sandy Houck, LEED AP, LC
shouck@brummitt.com
August 18, 2011
B R U M M I TT E N E R G Y A S S O C I AT E S , I N C .
Helping people achieve very energy efficient buildings