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CasE study 06 BEndigo BanK HEadQuartErs Sustainability with a community focus Through the use of ecologically An integrated approach to the ESD elements of the building was produced through collaboration between sustainable principles for the design building designers Bligh Voller nield and Gray and construction of this building, Puksand, engineers Meinhardt and ESD consultants Bendigo Bank is demonstrating its Connell Wagner. ongoing commitment both to the The new Bank building is not just a bank headquarters; it regenerates an area of the central city and extends local Bendigo community and the the commercial hub of the city. Modern urban design, global natural environment. with mixed use and increased street level activity is set to make the centre of Bendigo more vital, accessible The new state-of-the-art Bendigo Bank headquarters and diverse. sets new environmental building standards for commercial buildings in regional Victoria. Bendigo Bank is redeveloping an entire city block bordered by KEY STATISTICS Bendigo Bank headquarters Mitchell Street to the north and High Street and the Bendigo Creek to the west, in central Bendigo. The Predicted energy savings 51% six-storey office building, including retail on the ground Estimated greenhouse pollution saved 1175 t CO2e/annum floor, will accommodate approximately 900 staff. The building includes one of the first large-scale applications of under-floor air conditioning in Australia, an innovative external screening design to the large west-facing façade, and blackwater recycling. C O B E I I > C o M M E r C i a l o F F i C E B u i l d i n g E n E r g y i n n o vat i o n i n i t i at i v E Figure 1: West elevation CasE study 06 sustainaB lE d Esign solutions Building details community’ through the joint development of 600m2 Esd strategy of public square at the front of the building with Building name Bendigo Bank Head Office Bendigo City Council. Bendigo Bank had three main priorities in the Address brief for the new building; to provide a first class Under Floor air conditioning Fountain Court, Bath Lane, Bendigo working environment for staff; to enhance the Bath Under Floor Air (UFA) conditioning is unusual in lane precinct; and to create a world class building Building cost Australia because most buildings do not have the regarding its environmental performance. in turn, $57.5m for base building, raised floor required for the ductwork. However, it this required careful attention to construction and $15.75m for integrated fitout provides significant advantages to ceiling-mounted materials and the design of office areas to maximise delivery systems which force air down onto building Total floor area (NLA) natural light, comfort and wellbeing, coupled with occupants. UFA conditioning provides fresh, clean 13,336m2 (office area) an urban design approach ensuring that the new air at low pressure as a gentle breeze, with many headquarters complements rather than dominates Number of storeys outlets, which occupants can control locally for their the cityscape. Six own comfort needs. The ESD strategy aims to achieve significant Occupier The UFA system is simple and easy to use by staff performance improvements on a conventional Owner occupied with retail and has clear environmental benefits. Fans use building, while assisting in long term savings on ground floor less energy as the air is at lower pressure, and the through lower running costs. it is predicted that the system works with the natural stratification process, New or refurbished building will consume half the energy of a typical introducing air at floor level, allowing warmed New office building, reduce potable water use by over and polluted waste air to rise naturally, where it is 50%, and allow for ease of maintenance, repair Construction time extracted at ceiling level. Further, ambient air can and replacement. The latter will make for a more Stage 1: 20 months be used for more of the year than with conventional Stage 2: 15 months sustainable building, with a lifespan of 80 years, systems, further reducing energy use by reducing thus reducing the overall environmental impact of Delivery method chiller operation. the materials. Lump sum contract in keeping with the Bank’s focus on regional daylight and lighting Project team community and the environment, most of the Double glazing is used throughout the building, building materials were sourced from within and daylight and views are key features; external Client/partner 200km of the site. Also, they were selected for views will be available from 75% of the office area Bendigo Bank their low embodied energy, providing an overall (nlA), and provide views over rosalind Park and Project manager 20% reduction in embodied energy compared to the cathedral. Gallagher Jeffs conventional construction materials. Embodied Daylight is good for staff and the environment, energy describes the energy required to Architect since it provides a link to nature, and reduces Bligh Voller Nield/Gray Puksand manufacture and deliver building materials, from the need for artificial lighting. However, too much mining through to the construction process, and daylight produces glare, and so shading screens ESD consultant typically comprises 10-30% of the total life-cycle Connell Wagner are used along the longest (western) façade. energy requirements of a building. There are also automated internal blinds to all Services engineer windows and skylights, shading screens to the Meinhardt (Vic) northern façade, high performance double glazing Structural Engineer site context and layout throughout, and lighting control features which Meinhardt (Vic) Bendigo Bank made the conscious decision adjust artificial lighting in response to natural to redevelop a current site rather than opt for a daylighting conditions. Quantity surveyor greenfield development. in so doing, they are also WT Partnership The building as a whole achieves a good daylight assisting Bendigo City Council in their efforts to factor to the majority of the office floor space Builder revamp the Bath lane precinct. (nlA). This provides good general lighting which Probuild Constructions The new and old buildings are linked via aerial can be supplemented with task lights at work (Aust) Pty Ltd bridges at both car park and reception levels. To fit surfaces (a daylight factor of 5% or more could within the city scale, the new building is low by bank require no supplementary artificial lighting). The HQ standards at six storeys, and Bendigo Bank 2.5% daylighted areas extend up to 6m from the have highlighted their policy of ‘giving back to the windows on both the north and south sides of the Mechanical Treatment: Primary Treatment Biological Treatment: Secondary Treatment Disinfection Treatment: Tertiary Treatment Raw sewer from To secondary Nitrogen to Filtered water to waste stack treatment atmosphere Air blower tertiary treatment UV treatment Screening Chlorine dosing Aeration tank Anoxic tank Balance tank Transfer tank Contact tank Minerals and non-organic Fine particulate Class A water to roof Chlorine loop matters to sewer membrane filter mounted flusher tank Figure 2: Water treatment system building, and the internal atria cascade additional natural light into the core of the building. Artificial lighting is based on task lighting, to maximise user control. Additionally, some uplighting Double-coated is incorporated to illuminate the ceiling and add to colour back insulated spandrel panels the natural light in the office spaces. 30% perforated Water use and reuse sunscreens to in common with many Australian cities, Bendigo has a metal frame Acoustic insulation drought-vulnerable water supply and as a direct result, is currently experiencing extreme water restrictions. Motorised blinds Suspended ceiling Without the adoption of water saving technologies, this Internal blinds building would become one of the largest single water Front glazed framing users in the City of Bendigo, and place additional load system with vision glass OFFICE on the already stressed reticulated water system. Diffused light through Therefore, reducing the reliance on reticulated water perforated screens was a key design consideration for the building. This Perimeter rebate has seen the installation of a recycling water treatment Direct summer plant (rWTP) to treat both black and grey water and sun deflected provide treated Class ‘A’ water for use in toilet flushing throughout the building. The rWTP uses a three-stage Double-coated process whereby the water is mechanically filtered colour back insulated then biologically treated before being disinfected, then spandrel panels stored in a 10,000 litre tank located in the rooftop plant Warm air return Vision glass room and reused for toilet flushing. Thus no water from reticulated supply is used for toilet flushing. This will Hot air rises result in some 17,600 litres of wastewater treated per day, saving around 4.5 million litres of drinking water In a displacement from being flushed down the toilet each year. ventilation system the OFFICE Additionally, the use of AAA rated water saving toilet air, as it gains heat loads flush devices and tapware will ensure the minimal from the room, rises naturally to the air return amount of water is used. Proprietary floor system Cool air supplied via Rainwater use raised floor plenum and individually controlled rainwater will be collected from the roof area floor registers (960 sq.m.), filtered, and stored in a 10,000 litre rainwater storage tank located on the rooftop. This is solely for use in the drip fed irrigation system Perforated metal supplying the landscaped gardens at the front of sunscreens Air supply the building. The landscaping provides two main purposes; it provides an attractive and natural context for the OFFICE building, and contributes to the passive thermal comfort of the building. At least 60% of the planting stock is from indigenous sources, and features include restoration of the degraded Bendigo Creek and a green boardwalk link from the city centre Figure 3: diagrammatic section through window encourages visitors over to rosalind Park. wall showing floor plenum and sunshading ‘We expect the new building will have a positive effect on the productivity of our staff.’ RIChaRd hassELdInE, CHiEF GEnErAl MAnAGEr, GrOUP DEliVEry AT BEnDiGO BAnk. Indoor air quality Evaluation and lEarnings low VOC materials and finishes are used throughout The decision to redevelop an existing site is good for sustainability although the interior fit-out, to minimise off-gassing of it creates complexity and constraints in design and some existing buildings potentially toxic pollutants affecting air quality and and parking have had to be removed. However, most of the original Fountain user amenity. Also, a clean, dust-free atmosphere is Court building is retained, providing dual benefits of retained skyline and provided through incorporation of a Central Vacuum reduced construction costs. Cleaning System (CVCS). One proposal which was considered was to use triple glazing to enable high The CVCS provides multiple benefits for occupants, thermal efficiency while maximising daylight inside the office space. There cleaning staff and the environment. The technology were not enough suppliers able to provide triple glazing within the local area, includes bagless water filtration of dust and provides stipulated within the design brief, to be able to feel confident of competitive consistently strong suction. The result is a more pricing. This illustrates that the availability of suitable sustainable products is effective cleaning system that reduces allergenic often an issue in designing and building world class buildings incorporating mould, dust and moisture problems, and is some ESD principles. 40% faster than conventional vacuuming. Cleaning staff do not have to wear heavy, noisy backpack units, Vacuum flush toilets (similar to those used in aeroplanes) were also considered and are therefore more able to undertake thorough but were eventually rejected as it was felt that the noise would not be cleaning under desks and so on. acceptable to staff and finding local (Bendigo) repairers could be problematic. The quiet system also allows cleaning staff to operate Other major benefits predicted for the building include reduced staff during office hours, eliminating the need for after sickness and increased productivity and well-being. To investigate this, a hours lighting and ventilation and allowing for an pre-occupancy survey of staff currently based in five of the Bendigo based important social connection between the staff that buildings was undertaken, where staff commented on aspects such as occupy the offices and those that clean them. An lighting, heating, cooling and noise levels. The results from the survey additional environmental benefit will be reduced indicated that some buildings scored satisfactorily while others scored very flooring replacement since the more effective cleaning poorly. A post-occupancy survey will be conducted in the new building after can prolong the life of carpets. 9-12 months to assist the Bank to gain a better idea of the impact on comfort, satisfaction and productivity in the new working environment. Transport Over a quarter (27%) of parking space allocations are for small cars (22 spaces) and motor cycles (7 EnErgy savings spaces). This is to encourage the use of more fuel- Standard office building energy 600 MJ/m2/annum efficient personal transport amongst staff. A total of 49 bicycle spaces have also been allocated including 3 Estimated energy intensity 296 MJ/m2/annum for visitors, along with showering, changing room and locker facilities for bicycle users. Percentage energy saving 51% Estimated energy saved 4 054 144 MJ/annum The design of the building Estimated greenhouse pollution 1175 t CO2e/annum commenced with considerations of occupant amenity and the WatEr savings urban setting – we designed from Waste Water Collection Litres/day the inside out for high indoor Pan flushing 6935 environment quality. Urinal flushing 2667 PETER MaThIEsOn, ESD COnSUlTAnT, COnnEll WAGnEr Taps 2000 Showers 6000 aBout CoBEii Sustainability Victoria The Commercial Office Building Energy Innovation Initiative (COBEII) is designed to 1300 363 744 showcase the benefits and commercial viability of innovative sustainable energy design in Level 28, 50 Lonsdale St commercial buildings. Sustainability Victoria is partnering with the developer of this project Melbourne Victoria 3000 Australia to develop sustainable energy solutions that will significantly reduce the building’s energy www.sustainability.vic.gov.au consumption in operation. COBEII was launched in partnership with the Property Council of Australia in 2003 and is supported through the Victorian Greenhouse Strategy. Please refer to www.sustainability.vic.gov.au for more information. COBEII Project Partners
"Sustainability with a community "