CATEGORIES2018 Conference Papers Architectural Science: Building and Energy Conference Papers
The minimisation of building energy needs for cooling is challenging as acting on the building envelope and services is not sufficient. To achieve significant cooling savings, the mitigation of the local outdoor climate is necessary. This is particularly relevant in Australian Cities. Here we show the cooling energy savings that can be achieved with local climate mitigation in Darwin and Western Sydney with greenery, cool roofs and cool pavements, water sprinklers and fountains, water technologies and greenery, or and water technologies and cool roofs and pavements. In Western Sydney, in the unmitigated scenario, the cooling energy needs 50 km from the coast are approximately 1.5 times than if the same unretrofitted buildings were in coastal suburbs. Cool roofs and pavements combined with water fountains yield to savings of 39% for the residential and by 32% for the office building. In Darwin, combined greenery, cool roofs and pavements and urban shading can reduce the annual cooling load by 7.2%. In both cities, our results indicate the need to improve both building quality and outdoor local climate. Acting on only one of the two sides is not sufficient to achieve nearly zero energy buildings in Australian climates.