07 gregers reimann, day lighting technologies, 14 october 2009
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Daylighting Technologiesin the tropics
By:
Gregers ReimannIEN Consultants Sdn Bhdwww.ien.com.my
The Royal Chulan Hotel14 October 2009, Malaysia
Main TopicsIssue 1: Do people want daylight?Issue 2: GlazingIssue 3: Daylight systems
Issue 4: Daylight controlsIssue 5: Task lighting
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DO PEOPLE WANT DAYLIGHTING?
Question
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Survey among 46 building
professionals in Singapore
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Survey among 46 building
professionals in Singapore
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Survey among 569 office buildingoccupant in Manila, Philippines
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Survey among 46 building
professionals in SingaporeMisconception that daylight is hot:
Daylight through normal glazing is 2.6 times cooler than
people think
Daylight through high performance glazing is 4.9 timescooler than people think
Misconception that
daylight is hot!
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Daylight Sub-ConclusionSurveys show that:
People want daylighting
Offices with daylighting are marketable
Misconception that daylighting is hot,
when it is actually the coolest light source
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GLAZING
Best properties in the tropics for
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Glazing Terminology VLT
Visible Light Transmittance (0-100%)The amount of visible light that istransmitted through a glazing
SHGCSolar Heat Gain Coefficient (0-100%)The amount of solar energy (visible,near infrared and UV light) that entersthrough a glazing
Sunlight interacting with glazing forhigh performance spectrally selectiveglazing (applicable in the tropics)
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Advanced Lighting with RadianceNUS Department of Architecture
VLTVisible light tranmittance [%]
SHGCSolar Heat Gain Coefficient [%]
Pilkington productsU-value / VLT / SHGC
Different
GlazingPerformancesExamples
a) Suncool HP Brilliant 50- VLT: 51%- SHGC: 26%- VLT/SHGC ratio: 1.96
NB. Spectrally selective,allowing light, blockingheat
b) Optifloat Clear
- VLT: 81%- SHGC: 73%- VLT/SHGC ratio: 1.11NB. Only slightlyspectrally selective
a
b
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TECHNOLOGIES
Daylight
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Distributing Daylight
Roof lights
Lightshelf
Normal window
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Lightshelf (external)
Pro Reflection of light onto ceiling Shading of lower window
Con Cleaning of lightshelf Glare control needed
Wish list Spectrally selective lightshelf Automatic blind control
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Lightshelf (internal)
Pro Reflection of light onto ceiling Lighshelf easy to clean Less glare control
Con Lower window no shade Higher solar gain Internal lightshelf
Wish list Automatic blind control
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Higher Suspended Ceiling
Benefit Higher suspended ceiling alow for deeper daylight throw
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Daylight Facade with Mirror Lightshelves
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PTM ZEO building(Bangi, Malaysia)
No electric light 88%of the time
Lighting consumption is0.56 W/m
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Roof Lights
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Other Daylight Technologies
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Fish Reflecting Louvres
Always reflecting light onto the ceiling
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Okasolar reflective Louvres
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Tilting Light Shelf for Active
Daylight Control
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Variable Area Light Reflecting AssemblyMorning
Mid day
The position of the roller is adjusted as the suns altitude changes
through the day, to reflect sunlight onto the ceiling.
viewing window
path of roller
roller, morning position
roller, mid day position
glass panes
reflective plastic film
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Laser-cut Light Deflecting Panel
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View Through a Laser-cut Panel
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Venetian Blind of Laser-cut Panels
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Laser-cut Panel in Pyramid
Skylight
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Waterford School, Brisbane,
Australia
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CONTROL
Daylight responsive lighting
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Daylight Responsive Lighting
Lighting Control Automatic off (light sensor and/or occupancy sensor) Manual on (people press the wall switch)
Use task light (table lamp)
Lighting Zone 1 Lighting Zone 2
Task light(example)
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THANK YOU
Last slide