A window to warm up his house

With the University of Strasbourg, an industrialist is launching solar glazing with promising qualities.

"We all have a wall in the house in the sun that is useless!" ". Jean-Marc Robin proposes to use this wall. By replacing it with insulating glass, lined with a solar energy collection system to produce hot water! Nothing to do with the traditional opaque sensors fixed until then on the roof. The idea has been developed for four years by this industrialist, in partnership with the research teams of the National Institute of Applied Sciences (INSA) in Strasbourg. (formerly ENSAIS)

Solar has been around for twenty years. The basic technique did not evolve much in the end. Today, we just manage to capture more and more energy and lose less and less, "explains Jean-Marc Robin.

Transparent on 40% of the surface

Transparency and isolation are the keys to innovation which is now entering the commercialization phase. It is in the form of a classic window, cut however in an extra-white glass, in front of which runs a copper coil hidden behind dark colored fins. At the rear, silver reflective strips further increase the productivity of the system. In the network circulates a heat transfer fluid which, by heat exchange, then makes it possible to heat the water intended to temper the interior of the dwelling.

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The fins, combined with the metal strips, allow 95% absorption of solar energy. They also play the role of solar shading. “In front of a standard glazing, the sunshine is generally such that one cannot stick to it. There, the radiation is very attenuated. »While maintaining transparency on 40% of the surface! “In addition, we increase the brightness at the back of the room. "
Conversely, the high quality of insulation chosen for the glazing prevents heat loss to the outside and provides protection identical to that of a wall.

30% of energy requirements covered

For the time being, the device is installed on the Climatherm platform of INSA Strasbourg where it is being tested under the authority of Bernard Flament, doctor of energy. Its development has benefited from aid from Anvar and the Alsace region. Because the market is promising. In the public sector, but also with individuals. It must be said that the performance of the system is something to dream about. In a so-called low energy house, that is to say one that consumes less than 6 liters of fuel per m2 per year, we can consider that a 10 m2 solar glazing covers 30% of energy needs. »For an installation cost between 900 to 1100 € per m2.

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Jean-Marc Robin is particularly cautious about the time required to amortize the cost of the installation, "probably on the order of ten years". With the unknown price trends for non-renewable traditional energies.

A research center in Freiburg, another in Stuttgart, validated the project, which was based on readings from the Nancy weather station. We know that the region does not shine by the quality of its sunshine!

However, solar glazing has kept its promise. Besides, Jean-Marc Robin confides to be in contact with public organizations of collective housing of the sector, where his invention could well find outlets.

according to Est Républicain on 07/03/05

Contact: Jean-Marc Robin, INSA Strasbourg, 24, Bld Victory, 67084 Strasbourg. E-mail: robinsun@web.de

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