AWARDS | BUILDING PERFORMANCE CHAMPION and reduces waste to landfill significantly because of the increased life of LED fittings. Lighting control within office and back-of-house areas is via a range of motion (PIR and microphonic) and light (photoelectric) sensors. Lighting-control zones are smaller than 100m2 in area, and all lighting control interfaces with the building management system (BMS). Soft landings The scheme has achieved 5.5 Nabers stars for indoor environment theoffices while maintaining views out. Somfy manufactured the blind motors, producing a 365-day sun-tracker model, withintegrated web-based controls. This controls precisely the louvre angle, depending on where the sun is incident on afaade at a particular time, on a particular day of the year. The shadow-management software also predicts the areas of the buildings faade that will be shaded by the surrounding buildings at any time, and then opens the louvres in those areas to allow in more light. This may be a useful feature given that 75% of Mirvacs workstations are located within 7.5m of a window, giving employees access to natural light. The system also allowsadministrators to log on to the system to close the blinds further, should they wish. The system is based on an open-protocol KNX system; the blind motors are linked to controllers, which are connected to a LAN backbone and a central processing system based on a Tridium Niagara network. Sensors on the roof detect light levels relative to a threshold and the blind-management system will adjust the blind angle accordingly. This system manages 34 line masters, 754 motor controllers, 2,879 venetian blinds and motors across 351 zones, with each zone containing between four and 18 blinds. Palin says a key element in achieving the 5.5-star Nabers for Offices energy performance was the commissioning, tuning and handover phase. We put a fair bit of resource into having a 24-month tuning process under soft landings, he adds. Again, operational input was critical at an early stage to ensure a focused approach to tuning and to the allocation of resources to support that process. In conjunction with Mirvacs operational team, an independent commissioning agent (ICA) was appointed before commissioning, to review the design and give feedback. The commissioning team comprised Mirvac Development, Construction and Operational representatives, design consultants and contractors, and the ICA. Thisteam was in place for two years to optimise the building performance and to learn from the initial operational phase of thebuilding. To aid the tuning process, a SkySpark fault-detection and diagnosis package was used to monitor and interrogate building operations, and to detect control-system anomalies. This system was hosted and managed by Bueno, while the installed BMS is a Metasys Building Automation System. Regular meetings between BMS and mechanical contractors, facility management and sustainability teams are held to The towers structure comprises a reinforced concrete core and post-tensioned concrete floorplates LED lighting Lighting on the office floors is programmed for the varying levels of brightness throughout the day. The EY Centre is Australias first fully LED-lit buildings. At the time the scheme was being developed, LED lighting systems for open-plan office floors were still in their infancy. We trialled between 20 and 30 systems in the offices in which we were working, and inthe site offices, to find the best solution, Palin says. The extra effort was worth it: according to the schemes lighting designers, Arup, the solution offers energy-consumption savings of 25% over T5 fluorescent lighting, 34 March 2019 www.cibsejournal.com CIBSE Mar19 pp32-34, 36 Mirvac v2.indd 34 22/02/2019 16:37