solaveil data 2011
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8/7/2019 Solaveil Data 2011
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Solaveil™ Diffused Daylight Not Sunlight
Telephone
+44 (0) 2920 837 460
Facsimile
+44 (0) 2920 793 867
www.solaveil.co.uk
Head Office
Suite 8
CBTC2 Off Parkway
Capital Business Park
Cardiff, UK CF3 2PX
TM
Sun Shading - Basic Facts Solaveil™
Human Intervention
Solar shading, or the process of controlling sunlight entering a
building, can be accomplished through a number of different
methods. The techniques generally employed depend on the climate
and the intended use of the space.
For instance, in climates with a high cooling load, sun entering the
space (Solar Heat Gain) will significantly increase cooling energy
needs. In cooler climates, the excess heat from the sun may be
desirable at times, but glare and high contrast ratios may make it
difficult for occupants to work efficiently.
Unfortunately, all building shading systems still required the addition
of internal window blinds to block low-angle sun.
Building occupants seldom adjust their window blinds during the
course of the day; they tend to leave their blinds closed even when
glare-free diffuse daylight could be admitted.
Window blinds are typically more than 50% closed at any time.
It might be expected that occupants would close blinds to exclude
sunlight, and open them again under cloudy skies to admit more
daylight, but results show that occupants set their blinds to a
position in which solar glare is sufficiently excluded under most sky
conditions, and leave the blinds in that position for weeks, months or
even years.
Window blinds in an office building were monitored using
photographs of the façade. The east, south and west facades hadan average of 50%, 66% and 62% occlusion respectively.
Between cloudy days and sunny days, these occlusions varied up or
down from the average by only 10%, 1% and 2% respectively.
Solaveil™ allows some of the daylight incident on the surface to
pass through it undisturbed in the normal way, but intercepts the
majority and redirects it into the room in other directions.
The optical process involves, refraction and reflection, and is
extremely efficient, with virtually no daylight being rejected or
absorbed, and no chromatic aberration (colour fringing) is
introduced into the processed daylight.
Daylight arriving from higher elevations, which is normally wasted
by falling on the floor just inside the window causing glare for
those nearest the window, is intercepted and redirected deep
inside the room where the light is needed most.
This combination of reduced illumination levels near the window
and increased illumination elsewhere means that the room is much
more evenly lit; further enhancing comfort for the occupants.
Moreover, the extra light directed to the back of the room is
relayed there by the room’s normal light coloured ceiling and side
walls, making the additional illumination appear to come from a
generally overhead source, to the further benefit of the occupants’
feeling of wellbeing.
Solaveil™ Daylighting strategies can provide large reductions in
lighting and cooling related energy use, as well as improved
amenity, satisfaction, and occupant performance.
Solaveil™ is a new innovative
technology, with proven
effectiveness at lowering the solar
heat gain coefficient to reduce
cooling, while maintaining thevisual transmission of the glass
to capture daylight savings.
An integrated design balances
the cooling load of the window
against required day light
illuminance levels, thereby
capturing both cooling and
lighting energy savings without
creating discomfort.
Solaveil™ is a Daylight Activated,
Variable Optical Element (VOE) inthe form of an intelligent,
nanostructured material consisting
of nanometre sized crystallites,
primarily intended for use in
windows, vertical walls and
skylights to enhance the
daylighting performance of
a room and building.
2400
gy(
y)
P e a k ( W / m 2 )
85 87 88
320
240
Cooling
Single-pane of selective Tint Clear glass (85)
Low-e selective Tint (87)
SolaVeil sV0 (88)
Fans
Lighting
Peak Energy
160
80
80
1800
1200
600
0