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Australian Solar Energy Society & Institute of Sustainable Futures Information Night - Radiative Cooling - Professor Geoff Smith and Dr Angus Gentle
University of Technology, Sydney

Cooling buildings and cities naturally with higher albedos and night sky radiation Large cooling capability without external power is easy once you know which materials and structures to use. In addition these
approaches to cooling pump heat directly back into space, to improve microclimates around buildings. In contrast compressor
driven (and solar absorption) cooling exacerbate the urban heat island problem, which arises mainly from the combination of low urban albedos and high thermal masses. Various ways of using both high solar reflectance and night sky radiative cooling will be discussed ranging from special roof paints to simple systems which collect and store sub-ambient "cool" at night. After
introducing the principles of radiative cooling, including which surfaces work best, dealing with convective gain, moisture condensation, and role of humidity, exciting initial results with prototype collectors 3.6m2 in area will be presented. Models have been developed which predict observed sub-ambient cooling powers, and can be used in design.

Geoff Smith has worked on materials for solar energy, radiative cooling, daylighting and lighting for over three decades, often with industry. A number of products have resulted. Much involves use of nanostructures and thin films. Just out is his book coauthored with Prof Claes Granqvist from Uppsala, Sweden "Green nanotechnology: Solutions for sustainability and energy in
the built environment" which shows in detail how we can best get back "in tune" with nature, and what to expect if we make the effort. Angus Gentle has degrees in both Applied Science and Electrical Engineering from UTS. His PhD involved research on energy efficient window coatings including new work on thermochromic thin films. He has since carried out research on solar cells at UNSW and has recently achieved several advances in radiative cooling coatings and systems at UTS