South Africa Green Star
was already under construction and Green Star
Project team
The professional team has been
requirements were not included in the tender
documents –so changes had to be made retrospectively.
Architects: GLH; Terra
unbelievably enthusiastic about All construction documents had to be reviewed and
Ether
Green Star. A lot of it is to do with
redrawn where necessary.
Sustainability adviser:
overcoming resistance to change in
The team needed to achieve consistency in modelling
WSP Green by Design
for daylight, thermal, energy – each of which was
Project manager: Coffey
people’s minds – Eric Noir done by different team members. There was also the
Projects
challenge of helping the whole team to understand the
Mechanical engineer:
Aurecom
to 40 per cent more energy efficient than conventional CIBSE Codes and other codes that are part of the Green
systems. It includes daylight sensors around the façade Star requirement.
Structural engineer: WSP
Structures
perimeter to adjust the electric lights according to Noir, a founding member of the Green Building
natural light levels, and motion sensors to switch them Council of South Africa, adds: ‘The professional
Electrical engineer:
Claasen Auret
on and off depending on whether anyone is working in team has been unbelievably enthusiastic about Green
the area. Occupants can also adjust the lighting levels Star. The rating entails quite a bit more effort and
Main construction
contractor: Group Five
in their own particular working area. documentation that they wouldn’t submit normally. A
To some extent the hands of the green construction lot of it is to do with overcoming resistance to change
Quantity surveyors:
SBOS; LDM JHM
team were tied by the fact that Phase II is an extension in people’s minds.’ l
of Phase I; the basement was already in place and the
orientation and massing were predetermined.
The aesthetics of the façade also had to follow
Phase I, including the glazing ratio; although Noir
says that, where possible, the tinted glass was actually
downgraded to clear glass, because anti-heat gain glass
captures the sun’s heat and acts like a radiator for a
two-metre zone near the window.
The windows are double-glazed, which is not a given
in South Africa, while the walls are well insulated
by local standards. In addition, the construction
company Group Five managed to recycle 85 per cent
of construction waste on the project.
Reinink says the Green Star application was a huge
learning curve for all concerned – WSP was effectively
‘test driving’ the newly introduced tool, and there was
no previous experience of the process.
WSP Africa team spent time with WSP Lincolne
Scott in Australia to benefit from their experience of
Adapting Nedbank Phase
developing and implementing the Australian Green
II for Green Star standards
Star system.
was a learning curve for the
One complication, say Reinink, was that building project team.
Design plan Environmental aims of Nedbank Phase II
Energy • Thermal insulants to have an ODP of zero • Carbon dioxide sensors integrated at
• Heat rejection via energy-efficient, open- • Development should not increase peak storm the return points on each floor to ensure
circuit evaporative cooling towers water flows for rainfall events of up to a 1-in-2 continuous monitoring and adjustments of
• Economy cycle designed to provide 100% year storm fresh air into the building
fresh air to 60% of the floor plates when • Outflows to sewerage system due to • High frequency ballasts installed in
outside conditions allow occupant use to be reduced by implementing fluorescent luminaries in all offices
• Lighting power densities for 95% of the offices high-efficiency fixtures and fittings, with the • Lighting design to achieve an average
with an energy use of 2.25 W/ sq m per 100 Lux blackwater treatment system to further reduce maintained illuminance level of no more than
• Digital addressable lighting system for 95% of the outflow 400 Lux for the offices
the offices, providing greater flexibility for light • 60% of the offices with a direct line of sight to
switching Indoor environment the outdoors or into the day-lit atrium
• Fresh air intake in the building 100% greater • Noise levels not to exceed 45dB(A)eq in open
Emissions than required by SANS 10400-O plan office
• Refrigerants and gaseous fire suppressants (5 litres/second/person for offices) • Volatile organic compounds of office interior
have an ozone depleting potential (ODP) of • Air Change Effectiveness to be >0.95 for 97% paint and carpets to minimum Green Star
zero of the office usable area South Africa Office v1 nominated levels
www.cibsejournal.com March 2010 CIBSE Journal 35
CIBSEmar10 pp32-35_nedbank.indd 35 26/2/10 12:00:49
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