17 April 2013 — WT Sustainability’s Sydney office, at 181 Miller Street, has achieved a NABERS office tenancy rating of 6 Stars – before buying GreenPower.
NABERS tools were used during the design stage of the fitout to control and monitor sustainable design and construction targets, initially focussing on the large energy users within tenancies – supplementary air conditioning, lighting and office equipment.
The result has been delivered energy savings of up to 78 per cent on the average office tenancy.
Sustainability initiatives included the avoiding the use of a supplementary air conditioning system for the office’s meeting area by integrating the space into the open plan office. The base building air conditioning system was commissioned and balanced to suit the tenancy layout.
A high-speed temperature tolerant communications system linked to an off-site data centre was adopted, to avoid the need for a dedicated server room saving both server power and the power associated with additional cooling.
E1 light fittings controlled by occupancy sensors in zones of 30 square metres or less were installed. The lights dim to 50 per cent if no occupancy is sensed after five minutes, and after another five minutes with no occupancy sensed, the lights turn off. The sensing times are quicker for areas which are infrequently occupied, such as the tea room and photocopier areas.
The office layout was designed with low height partitions and glazed office partitions. Eighty-six per cent of work settings in the tenancy have access to daylight based on Green Star calculations. This allows lights to be controlled by photoelectric cells so they turn off or dim when there is adequate daylight.
WTS director Stephen Hennessy said the office was “light and bright” saving money with no loss of amenity.
“Most people walking into our office would be hard pressed to see how we are achieving such extraordinary energy results,” he said.
To control energy consumption by office equipment a timed power circuit was installed to the work stations which cuts out-of-hours power, eliminating standby loads.
Computers are off-the-shelf efficient laptops and the docking hub screens are large LED LCDs which makes it easy to review documents side by side, saving on printing costs.
The colour printer is an LED multifunction device that costs no more than comparable 32 page per minute machines, yet it uses up to 75 per cent less energy.
Sub meters were also installed by Commercial Energy Services, the building owner’s metering provider, which can be accessed via a web interface. This allows real time monitoring of energy consumption and helps to identify areas for further energy savings.