27 June 2011 - Engineering, management and specialist technical services group Aurecon has a new home in Tshwane.
Their Lynnwood Bridge Office Park building, situated just off the N1 highway, houses approximately 1 000 of their Tshwane staff and is a celebration of green-minded design and construction. These offices have been registered with the Green Building Council of South Africa for a GreenStar SA – [Office Design v1, Office Design v1] rating, with the aim of achieving a 4 star GreenStar SA rating.
“Aurecon is a silver founding member of the Green Building Council of South Africa (GBCSA), an organisation which promotes, encourages and facilitates green building in the South African property and construction industries. Our sponsorship of the council’s efforts confirms our support of transformation in industry and affirms our commitment to playing a leading role in promoting environmentally sustainable development. In line with this, it is important that our own buildings and facilities are designed and built in a sustainable manner,” comments Aurecon’s Chief Operations Officer, Gustav Rohde.
As the developer and co-owner of the building, Atterbury Property was responsible for the project management on the entire project, which forms part of their new 73 000 m² Lynnwood Bridge precinct. Aurecon was responsible for all the engineering design disciplines on the project. Having gained vast experience on similar projects, including Phase II of Nedbank’s head office in Sandton, which was certified as South Africa’s first Green Star SA building, the group was certainly ready for the challenge.
“From the onset, we knew it wouldn’t be an easy task,” comments Aurecon’s national green building expert, Martin Smith. Conventionally, green buildings aren’t allowed to be built within 100 m of a wetland, yet the site allocated to Aurecon fell within 100 m of the Moreleta Spruit, which is classified as a wetland.
“There are good reasons for this rule,” explains Martin. “Potentially harmful water run-off from buildings can negatively affect the surrounding flora and fauna.”
This led the entire project team to explore innovative ways of ensuring storm water run-off from their building wouldn’t in any way harm the near-by spruit. The solution, consisting of various species of plants affixed to the building’s northern car park facade, which acts as a natural filtration system, is a first for South Africa and led the GBCSA to reconsider their ruling.
Added to this, because a GreenStar SA rating involves so many different elements of sustainability, it was crucial that Aurecon have a Green Star SA Accredited Professional on their team. Smith, who fulfilled the role of this accredited professional, comments: “A thorough understanding of each one of the GreenStar SA criteria, and how these interact with each other, doesn’t guarantee a successful rating, but it improves your chances of success because it enables you to unify the many sustainability concepts required on a single project.”
Aurecon will receive news on the success of their submission to the GBCSA later this year.
Aurecon’s quest for green-minded design and construction resulted in a number of innovative green building initiatives being applied at their Lynnwood Bridge Offices, especially in the areas of reducing the consumption of electricity and water, as well as improving indoor environment quality for staff, reducing the impact of materials on the environment, improving building design and management, and encouraging alternate forms of transport.
Reducing the consumption of electricity
The building was designed with an energy efficient facade, consisting of high performance glazing, extensive external shading, and insulated wall panels and an insulted roof.
Energy efficient light fittings with motion sensors have been used throughout Aurecon’s Lynnwood Bridge Offices. These ensure that lights are only turned on when a particular zone is occupied, and are predicted to save the company thousands of Rands in their overall electricity bill.
In order to even further reduce the amount of lighting required, the building design ensures that a maximum amount of natural daylight is brought into the space, reducing the need for artificial lighting during the day. A main element of this design includes a central atrium with a reflective high level ceiling. This ceiling was designed to reflect daylight into the windows on the southern facade of the building, simultaneously maximising natural light and ensuring minimal solar heat gain as windows on this side of the building do not receive direct sunlight.
Another significant energy saver in the building’s Heating, Ventilation and Air Conditioning (HVAC) system which is extremely efficient and includes carbon dioxide (CO2) sensors to ensure that enough fresh air is supplied into the building. Its full economy cycle ensures free cooling is possible when outside conditions are favourable. In addition, a central chilled water plant circulates chilled water throughout the building. Importantly, all HVAC refrigerants and gaseous fire suppression systems used have an Ozone Depletion Potential (OPD) of zero. All HVAC systems containing refrigerants are contained in a moderately airtight enclosure and a refrigerant leak detection system has been installed to cover high-risk parts of the plant.
Importantly, sub-metering has been installed for all major energy uses. This will enable the building owner and/or facilities manager to verify that equipment and systems are operating as per their design specifications, and to identify areas where potential energy savings can be achieved.
Reducing the consumption of water
The amount of potable (fresh, drinking) water supplied to and consumed by the building has been reduced through a number of measures, including:
Reducing the impact of materials on the environment
Building materials were selected to minimise possible negative impacts on the environment. This included:
Improving indoor environment quality for Aurecon staff
Staff flourish when they are placed in a comfortable and stimulating environment. Aurecon has achieved this in a number of ways, including:
Improving building design and management
After handover, the building owner will implement tuning of all building systems. Monthly monitoring will be undertaken and the outcomes will be reported to the building owner quarterly to allow corrective action to be taken. Full re-commissioning will be undertaken 12 months after practical completion. These initiatives will ensure that the building systems perform optimally, in the manner in which they were designed.
Encouraging alternate forms of transport
In order to encourage alternate forms of transport, 43 of the 844 parking spaces are dedicated solely for the use of car-pool vehicles, car share vehicles, hybrid or other alternative fuel vehicles. In addition, 76 secure bicycle storage racks have been provided, along with showers, changing facilities, and secure lockers. Visitor bicycle parking has also been provided.
“It’s important to realise that a green building is a long-term commitment,” comments Rohde. “What we set out to achieve is the creation of an office which doesn’t harm the natural landscape which surrounds it, and benefits the people who use it. I believe we’ve succeeded in achieving this vision.”
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