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RP1037: Driving Increased Utilisation of Cool Roofs on Large Footprint Buildings

Project leader name: 
Prof. Paul Cooper, University of Wollongong
Project status: 
Project period: 
08/2017 to 08/2018

Despite world-class products being manufactured in Australia, cool roof technology is, as yet, greatly under-utilised both locally and internationally.

Large-footprint buildings provide a significant opportunity for market penetration of local cool roof technologies, which will open up the cool roof market more generally; as long as the current barrier of lack of rigorous evidence and design information can be overcome.

Building energy modelling software packages, for example, greatly under-predict the benefit of cool roofs on large-footprint buildings because they do not account for the significant negative impact of the ‘heat-bubble’ that develops above a normal (non-reflective) roof in summer. The elevated temperatures in such heat-bubbles (or building-scale heat islands, BSHIs) significantly reduce the performance of roof-mounted cooling plant. The removal of this detrimental impact through use of cool roof products is likely to result in an even greater decrease in building energy use than through the ‘passive’ impact of the cool roof reducing heat flow through the roof structure into the building.

The project will deliver:

a) a comprehensive set of cool roof design and cost-benefit calculation resources, focussed on typical large-footprint Australian buildings; and

b) a rigorous experimental and simulation evidence-base of the impact of cool roof products on building thermal performance and the characteristics of the building-scale heat island above large-footprint buildings.

Publications related to this project

Peer Reviewed Research Publications

Proceedings of the 11th Australasian Heat and Mass Transfer Conference,  9-10th July 2018, RMIT University, Melbourne, Australia

Fact sheet

Cool roofs use roofing materials with high solar reflectance and thermal emittance, reducing the heat absorbed from the sun and increasing the heat radiated out to the sky. Cool roof technology reduces the amount of heat transmitted into buildings on hot days, and thus the amount of air-...