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VODAFONE SITE SOLUTIONS INNOVATION CENTRE, SACONCRETE CORE TEMPERING
www.rehau.co.za ConstructionConstruction
AutomotiveAutomotive
IndustryIndustry
SOUTH AFRICA SALES OFFICE
JOHANNESBURG, REHAU Polymer (Pty) Ltd, Pellmeadow Offi ce Park, Building B, Ground Floor, 60 Civin Drive, Bedfordview, Johannesburg, South Africa, Phone: 011 201 1300
Fax: 011 201 1350
www.rehau.co.za 11/2011/rowy
REHAU CONCRETE CORE TEMPERING SYSTEMINSTALLED IN INNOVATION CENTRE, SOUTH AFRICA
The six-star rating makes the Site
Solution Innovation Centre one
of Africa’s most environmentally
sustainable buildings. Located
at the Vodacom Campus in
Midrand, South Africa, it will be
powered with renewable solar
energy, use passive and thermal
cooling / heating technologies.
WSP Group commissioned
REHAU South Africa to design a
Concrete Core Tempering (also
referred to as Thermally Activated
Building Systems or simply
TABS) to augment and operate
in conjunction with the aircon-
ditioning system. Concrete Core
Tempering (CCT) is a method of
introducing heating or cooling
into a concrete structure by
means of embedding a series of
pipes in the concrete fl oor or ceil-
ing slab. The heating or cooling
energy thus produced is used to
substitute the heating or cooling
The single fl oor slab resulted in
a relatively simple installation.
Rolls of PE-Xa (cross-linked
polymer) pipes were decoiled on
site and fi xed to a steel mesh.
The loop lengths were designed
in such a way that there were no
joints required. Prior to casting
the concrete layer, the system
was tested at 6bar pressure.
The system was placed under
pressure the entire time it took
to pour the concrete. In this way
we were able to monitor the work
activity and check for leaks. As
a testimony to years of global
development and experience the
installation was leakproof and
the concreting operation went
smoothly.
“This is the second design, sup-
ply and install project undertaken
by REHAU Johannesburg and
served as a learning curve for the
fl edgeling CCT industry in South
Africa. This has enabled REHAU
in Johannesburg to confi dently
The Vodafone Site Solutions Innovation Centre has been awarded South Africa’s fi rst six-star Green Star rating. The building is expected to be completed by the fi rst quarter of 2012.
load generated by a central
airconditioning plant. Studies
have shown that as much as
70% of the airconditioned air can
be replaced in this way through
passive radiant heating/cooling,
saving on the electricity costs
used to drive the air-conditioning
system, as well as the size of the
air-conditioning plant.
CCT design was done by REHAU
in Ross-on-Wye, UK, whilst the
REHAU offi ce in Johannesburg
did the installation. The system
design consists of 18 loops, cul-
minating in 2 x 9 port manifolds,
generating approx 24.3 kW/m2
of cooling energy and 63 kW/m2
of heating energy. Approximately
2500m of 20 x 2mm PE-Xa pipes
were used on the project.
present its credentials and, with
its second successful project
complete, go into the market
with an installed base.” says Cliff
Barnard, Business Development
Manager at REHAU.
The CCT (passive heating/cool-
ing) industry is in its infancy in
RSA and requires a paradigm
shift in thinking by architects and
consulting mechanical engineers.
A recent article in the “Earth-
works” magazine states that
buildings use up to 15% of
the world’s energy usage with
HVAC accounting for 40% of
this amount. With world-class
technology REHAU is well placed
to play a leading role in the
reduction of these levels using
CCT technology.