07 gregers reimann, day lighting technologies, 14 october 2009

8/2/2019 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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professionals in Singapore


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Survey among 569 office buildingoccupant in Manila, Philippines


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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

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07 gregers reimann, day lighting technologies, 14 october 2009

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