Architect and Builder Magazine South Africa January/February 2015 | Page 27

clear for Building 3’s volumetric evolution
and, ultimately, the piazza between the three
buildings. The three buildings will complete
the enclosure for a much-needed green lung
in Sandton’s office precinct.
Sustainability
Alice Lane Phase 2 achieved a 4 Star Green
Star SA – Office v1 Design rating in December
2013. In order to achieve this rating,
sustainabilty aspects include:
The structure of the building is
predominantly concrete.
The main electrical supply consists of two
sections. The critical section is backed up by
a generator. The non-critical section powers
items such as HVAC chillers, pumps and other
non areas not requiring generator backup. All
other items are backed up via the generator.
There is one generator which provides the
emergency backup required for the building.
The fire protection system does not expel
water during testing. Water is directed back
into storage tanks. Energy consumption is
reduced to 165kWh/m2/year and carbon
emissions to 198kgCO2/m2/year. A groundwater harvesting system is in place.
The building is mechanically ventilated.
Heating and cooling is provided by means of a
four pipe central chilled water system using air
cooled reversible hear pump chillers and four
pipe in-ceiling fan coil units. Chillers placed
on the roof make use of the compression cycle
of refrigerants in order to transfer heat from
the chilled water circuit to the atmosphere.
Conclusion
The completion of the second building in the
Alice Lane trilogy brings the vision of three
iconic buildings surrounding a distinctive
piazza closer to being realised.

Alice Lane Phase 2

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