69 Robertson Street, Fortitude Valley
The innovative Floth office building is located beside the Brisbane CBD and comprises three storeys of office over a small carpark.
The building was designed by Mondo Architects, with all engineering services and sustainable design by Floth. The Queenslander that was previously located at this site was transported to Esk (QLD) to become the new home of a family who lost their house to fire.
The building achieved a 6 Star Green Star Design and As Built v1.1 rating, the first building to achieve this rating in Australia. The building was also the first recognized to comply with the Australian Sustainable Built Environment Council’s (ASBEC) zero carbon building guidelines.
Sustainable principles guided the design of the development and include features such as roof rainwater harvest, PV panels, occupancy and daylight-controlled LED lighting systems and heat recovery air conditioning systems.
The eToolLCD software was used to complete the Life Cycle modelling of the building in accordance with the EN15978 standard as required by the Green Star Life Cycle Impact credit. Following training from eTool, Floth conducted a whole of building Life Cycle Assessment on the building compared to a ‘Business as Usual (BAU)’ reference case and presented the findings of 10 environmental impact categories.
It is observed through the LCA modeling that the following areas have the greatest impact to the overall environmental footprint of the building:
The operational energy use for the building was the focus of the design since conception. The high performance façade consisted of well insulated assemblies and low-e double glazed units with integral shading provided by balcony elements and green walls. Air conditioning is provided by energy efficient heat recovery Variable Refrigerant Flow (VRF) fan coil units distributed throughout office space. The absorbed fan power of the units is reduced by selection at lowest fan speed setting via ductwork design for reduced airflow resistance. The ventilation system is demand controlled with CO2 sensors located in all office zones. A solar thermal hot water preheat system with an efficient gas heated storage tank was installed. An LED lighting system was used to achieve a lighting power density less than 6W/m2 . The lighting is also being automatically controlled with occupancy and daylight sensors located throughout the building. A 15kW roof-mounted solar photovoltaic system has been estimated to produce 28% of the total operational electricity used by the building.