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132 PROPOSAL TO REVISE ENERGY EFFICIENCY REQUIREMENTS OF THE BUILDING CODE OF AUSTRALIA FOR COMMERCIAL BUILDINGS C Procedure for energy efficiency modelling As mentioned in the main body of the report, the energy savings associated with the proposed amendments to the BCA energy efficiency provisions were estimated using energy simulation output data provided by the ABCB. This Appendix provides additional details about the procedure used by the ABCB for modelling various energy efficiency features and defines the building forms, their systems and other criteria used. The information in this appendix was provided by the ABCB. Buildings The following three buildings are considered to represent the thermal performance of most of the buildings constructed today and are sufficiently diverse to test any proposed changes to the BCA Volume One Section J. They have been modelled as BCA 2009 compliant (where current stringency is being modelled, at the limit of compliance) and as follows. a) As Greenfield sites with no over-shadowing. b) Except for the square building, all buildings were modelled with the longitudinal building axis on an east–west orientation and a north–south orientation (across both orientations the variation in the building energy use varied by less than 5 per cent). c) With glazing generally 6 mm single tinted on all four facades and with a glazing area to façade area proportion of approximately 40 per cent adjusted to just comply with Section J2 without projections, external shading devices or reveals. The glazing was modelled with internal Venetian blinds with a shading attenuation coefficient of 0.74. Venetian blinds were assumed closed on weekdays when the solar radiation exceeds 170 W/m 2 and assumed open at other times. d) With the air conditioning systems. e) Specifically selected as being typical for each building form as described below. f) Details as described under Services Details. www.TheCIE.com.au
PROPOSAL TO REVISE ENERGY EFFICIENCY REQUIREMENTS OF THE BUILDING CODE OF AUSTRALIA FOR COMMERCIAL BUILDINGS 133 g) With building forms selected to accommodate variations in the area of external surfaces (roof and walls) to the Net Lettable Area (NLA). For BCA compliant buildings the lower the ratio of façade to NLA; the lower the impact of the external environment on the energy use of the building. Building Form 1 • 3 storeys, all floors above ground and no car park under. 90 mm concrete block walls, 150 mm high density concrete roof, 150 mm high density concrete floors and the envelope elements with insulation to provide the required thermal R-value. • 36.5 m long X 18.3 m wide X 3.6 m floor-to-floor; 2.7 m ceilings. • External surface area / NLA ~ 1.1. • 2 equal sized tenancies of 18.25 m x 18.25 m. • Air-conditioning — 8 fan-coil units per floor (4 per tenancy), two air cooled chillers, heating and primary and secondary pumping and heating in the fan-coil units. • Condenser water loop for tenant supplementary cooling. • Allowances for domestic hot water and lifts. Building Form 2 • 1 storey above ground and no car park under. Light weight FC walls, 100 mm concrete floor, metal deck roof and each envelope element with insulation to provide the required thermal R-value. • 20 m long X 10 m wide X 3.3 m floor-to-eaves, 2.4 m ceiling. • External surface area / NLA ~ 2.1 • 2 equal sized tenancies of 10 m x 10 m. • Air-conditioning. – Generally 8 air-cooled split package air conditioners (4 per tenancy), with heating in each air conditioner. – For a restaurant 2 air-cooled split package air www.TheCIE.com.au
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