Architect and Builder Magazine South Africa September/October 2014 | Page 23

Passive design strategies,
which were extensively
modelled by WSP
in Africa’s Green by
Design team, have been
incorporated to reduce the
amount of energy needed
to achieve a comfortable
indoor temperature

criss-crossing bridges above the atrium and
the use of natural light create a comfortable
and visually appealing working environment
that promotes internal communication and
interaction among the occupants.
Building users have access to fresh air
where they need it. Within the EY Tower,
fresh air is distributed through the access
flooring to users at 7.5 l/p/s, which is more
than required by SANS 10400-O. The
increased fresh air rates maintain the general
airborn contaminants at concentrations

102 Rivonia Road

below exposures that have potential to
cause adverse health effects to a substantial
majority of occupants. The HVAC systems
consist of 3 air-cooled chillers located on the
roof. Primary & secondary pumps are used to
circulate the chilled water to decentralised air
handling units on each floor. Insulated supply
air ducts and variable volume controls supply
air to the office spaces. The air is controlled
through a wall mounted set point adjuster
(serving 35m2), allowing occupants to adjust
the desired temperature set point.

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