Sun protection - Warema

Art. No. 9967k0.06.2005
Object
report
Optimal heat
protection
Efficient glare
protection
Convenient control
The ultimate in air
conditioning with
WAREMA
LONWorks® control system
U N I Q A Towe r Vi e n n a , Au s t r i a
Sun. Light. WAREMA.

Property
The UNIQA Tower, new corporate
headquarters for Austria's leading
insurance firm, stands in Vienna right
next to the Danube Canal. The building
with a mullion and transom
façade was designed to achieve the
maximum possible energy efficiency.
For this purpose, the building was
given an additional second outer
envelope. The sun protection system
behind this consists of venetian blinds
engineered to ensure optimal lighting
conditions.
Client
UNIQA Immobilien-Projekterrichtungs
GmbH in Vienna has created state-ofthe-art
workplaces here for 1,100 persons.
On 22 storeys, the building provides
32,000 m 2 of office space. From
the first floor upwards, it is used
exclusively by UNIQA Versicherungen
AG. At the base of the tower, the
'Platinum Vienna' centre has been
integrated. This centre can be used
for events with up to 1,000 guests
and also has a café/bistro which is
open to the public. The building has
largely been automated through the
use of state-of-the-art technology. In
concrete terms, this means that
workplaces have standardised, optimal
conditions whereby each member
of staff has the possibility of altering
'their area' individually.
Architect
The building, a new landmark in
Vienna, was conceived and planned
by the winner of the international
architects' competition, Arch. Dipl.-
Ing. Heinz Neumann from
Architekturbüro Neumann & Partner in
Vienna.

Building details
Building use: offices, public areas
Workplaces: 1.100
Building height: 75 m
Storeys: 22
Basement levels: 5
Gross floor area: 38.500 m 2
Construction period: 33 months
Building costs: 70,04 Millionen Euro
Picture credits
Photographs: Gerald Zugmann
Specifications
Glazing
Outer envelope: 12 mm toughened safety
glass
Inside façade: Heat protection glass
– Ug : 1,1 W/ m 2
– g : 0,56 (g=SHGC)
Sun protection system
– 1650 light guiding venetian blinds
E80 LBAP with Hall sensor, slats
with half side perforation
Glare protection
– 1597 roller blinds, integrated into the
inner façade, running bottom-up, fabric
made of anti-glare foil
LONWorks control
– 850 LONMSE 230V for controlling light
guiding venetian blinds
– 425 LONMSE 24VDC for controlling
anti-glare roller blinds
– 1 LON weather station
– 20 LONVCU room control units
– Manual control via web browser, per
workplace
– slat guidance
– annual shade diagram
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Sun protection
Daylight systems
The 1650 sun protection systems with daylight technology
that are integrated into the double façade
have several functions:
– optimal sun protection: location in the double
façade allows g-values to be achieved by external
systems, independently of the weather. Cooling
loads are considerably reduced.
– the perforated slats ensures that visual contact with
the outside world is largely maintained, without
impairing thermal functioning.
– the LONWorks control system in conjunction with
the Hall sensor integrated in the blinds ensures that
slats are at the best angle in relation to the sun at
any particular time of day. This ensures maximum
efficiency of sun protection and daylight utilisation.
Sun protection and contact with the outside
world
The microperforated slats make for active sun protection,
allowing outward visibility without being detrimental
to the sun protection function. This design
guarantees that statutory requirements are met in
terms of screen workstations and thus that comfortable
workplaces are created.
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Optimisation of daylight
The blinds are divided into two
sections. The top section ensures
that natural daylight is utilised
while the bottom section
protects against insolation and
glare. In conjunction with the
controller, this allows maximum
benefit in terms of daylight utilisation
and sun protection.

Glare protection
Glare protection
Glare protection is integrated into the construction of
the façade elements (fixed glazing and moving pivot
casements). This planning design ensures that, when
glare protection is deactivated, it is concealed 'almost
invisibly' in the façade.
This obviously requires special technical solutions. The
necessary elements such as covers, guide rails, end
sections, etc. have been specially coordinated and
colour-matched to façade profiles with the result that
the entire construction appears as a homogenous
whole.
Efficient glare protection
The bottom-up functioning of the glare protection
system ensures optimal glare protection for screen
workplaces. Daylight utilisation is not impaired. The
fabric consists of an anti-glare high-transparency foil,
which guarantees excellent outward visibility.
It is driven by a 24 V DC shaft motor and controlled
decentrally from the respective PC workplace, thereby
taking account of employees' individual needs.
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Control
LONWORKS ®
Besides supreme functionality, planners and owner also
required a standardised, fast and reliable system. That
is why the owner opted for LONWORKS ® technology.
The particular advantage of this technology is its decentralised
processing of data, which makes this system
enormously powerful and immune to disturbance. The
control unit largely consists of a weather station, motor
control units, also known as actors, and the manual
control facility via the web browser as well as
WAREMA LONVCU room control elements.
The LON sensor unit is the first component to which
the sensors are connected for measuring outside
brightness and outside temperature. The measured
data recorded here as well as the date, time and current
sun position (elevation and azimuth) are made available
to all bus participants. The sun protection motors
are controlled by the dual motor control unit LONMSE
2M230I, which processes all the necessary data and
controls two light-control blinds independently of each
other. In conjunction with position feedback (Hall sensor),
the LONMSE 2M230I allows particularly accurate
position control.
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Features of the LONMSE
– Decentralised processing of data
– Switching points for sun, timer
– Parametrisable scenes
– Parametrisable automatic return
– Support of heating/cooling requirements
– Annual shade diagram
– Sat guidance
– Very accurate position control through use of the Hall
sensor
– Processing of window contacts
– Connection possible of up to 2 manual overrides
– Visualisation of weather data, blind position and
causes for movement is possible via central
building management system (BMS).
VCU LONMSE M230I
LONSE

Window contacts
Most inside-opening glass fronts are designed as
pivot vent windows. Window contacts that are connected
to the sensor inputs of the LONMSE 4MDC
block any movement of the roller blinds when the
window is open and at the same time, via a network
variable, indicate that the window is open to the
Johnson Controls individual room control unit. As a
result of this, air-conditioning is switched off and
power is saved.
Heating and cooling support
In order to save energy, the sun protection system is
also involved in the heating and cooling requirement
of the individual room control unit. A occupancy
detector signals to the LONMSE whether there are
any people in the room. If there is someone present,
thermal and visual comfort is provided through the
slat tracking. If none is present and the room needs
to be cool, the sun protection system is let down
and completely closed. When there is a need for
warmth, however, the system is retracted entirely in
order to heat the rooms using solar power.
Slat guidance
Slat tracking is according to the sun's orbit. As a
result, no direct sunrays come through the slats
while at the same time a maximum amount of diffused
daylight enters the room. The motor control unit
receives the computed sun position from the sensor
unit. It uses the parametrised limit values and façade
position to compute the optimal slat position and
controls the drive for the blind accordingly.
Annual shading
An important element in optimising sun protection
and daylight control on the UNIQA Tower is the
annual shade diagram. The building and neighbouring
construction are shown in a CAD programme and a
reference point is defined for each light control blind.
The specially developed WAREMA software computes
the shade patterns for each reference point
according to the time of day and season. This data is
entered in the motor control units and has the result
that the respective blind is only activated when it is
actually exposed to sunlight.
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WAREMA Renkhoff Holding AG
Hans-Wilhelm-Renkhoff-Straße 2 · 97828 Marktheidenfeld
www.warema.com · e-mail: info@warema.com