text: 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