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Supermarkets and other mechanically cooled buildings can directly measure the benefits of SkyCool through energy savings. However, non-air conditioned shopping complexes, warehouses and factories can have equally important need for keeping their environment cool and comfortable.
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One such building is the Direct Factory Outlet centre at Moorabbin, Victoria. While the most recently constructed sections of the building contain air conditioning, the original 13,000 square metres laboured under a non-insulated roof, with a small number of evaporative cooling towers. This large shopping area of the building was experiencing difficulties with over heating during the warmer months.
It was recognised by the centre’s consultant engineers that the majority of the heat was entering through the roof from the solar load. A normal galvanised metal roof will often attain temperatures approximately twice that of the ambient shade temperature – on a 30°C day, the roof can be as much as 60°C transforming it into a large overhead radiator.
As part of their pre-application research into SkyCool, the Queensland University of Technology was asked to model the effect of SkyCool on their building. The following graph produced by the University takes into account Melbourne weather variations hour-by-hour throughout the year. It shows the effect of SkyCool on the temperature of the air immediately below the uninsulated roof. At the peak of summer, SkyCool has the ability of bringing an overall sub-roof temperature of 65°C down to about 25°C. The occupied level of the building would experience a resultant temperature move from the mid to high thirties to the mid twenties.
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