Watery Windows To Boost Building Efficieny

Watery Windows To Boost Building Efficieny

Researchers at the University of Toronto describe a novel process to cut down on heat loss during the winter and can provide 7º to 9º C of cooling to buildings during the summer which can improve the efficiency of buildings by fitting window panes with tiny channels of water. The scientists says that these channels were inspired by vascular systems in nature such as blood vessels in the human body which can expand and contract to increase or reduce heat loss when too warm or cold. 

The researchers developed a sheet of transparent flexible polymer with a "cooling layer" of clear silicone, inside which there are the tiny channels with a cross section 1 or 2 mm high and 100 micrometers across. Through these, room temperature water was circulated to and from an external source at a rate of 2 ml per minute.

The sheet was applied to a model window 10 x 10 cm (3.9 x 3.9 in) in size, an analyzed with an infrared camera. The researchers say that the temperature of the window, which had been artificially heated, was reduced by 7º to 9º C. Because the temperature of the water is lower relative to the window, it is able to absorb heat energy and take it away. The process would be the opposite during the winter, when room temperature water would supply heat to the rest of the window. In either case the idea is that the window would become a more effective barrier to convective heat transfer, making the building more energy efficient.

When filled with water, the researchers say that the channels are "not clearly visible," but that when filled with a different liquid which refracts light a similar amount to the surrounding material, they become almost invisible. They suggest that different liquids could be used for various aesthetic effects such as altering color and transparency.

The technology  could also be applied to solar panels, increasing their efficiency. He also noted that as the water flows through the panels, it gets hotter, and this hot water could be used to supply heated water to an existing hot water system or to a heat storage system.

Do you really think that the water hold the key to more efficient windows?

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Write by: RC - Tuesday, August 6, 2013

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