Glossary
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Definition
Solar water heating system
A solar water heating system is a device that converts light radiation from the sun into heat to produce hot water. It is made up of a solar panel, a storage tank and a circulation system that transfers the heat from the solar collectors to the tank. By using renewable energy, this device helps to reduce CO2 emissions into the atmosphere.
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Heat collectors, usually installed on the roof of the house, absorb solar radiation which produces heat. This heat is transferred to a heat transfer fluid contained in a copper pipe which in turn heats up the water stored in a tank. To compensate for any lack of sunshine, a back-up device such as a heating element or boiler is connected to the storage tank. A domestic solar water heating system can supply 40 to 60% of hot water requirements in the north of France and 60 to 80% in the south. In France, the number of solar water heating systems is constantly increasing. In 2004 an additional 50% solar water heating systems were installed compared to 2003 whereas the increase was only 35 to 40% in previous years.
