PV uses specially designed silicon cells to turn sunlight into electricity. PV has been used for several years to power calculators, marine navigation aids etc. PV is also well-suited to providing power in areas without mains electricity. The collectors, which are usually mounted on a roof, contain a fluid which is warmed by the sun and used to heat a water tank. This involves designing buildings that make the most of natural sunlight for heating, lighting, ventilation and cooling.
Consideration is given to a building's layout and the materials it is made from.
They can also represent a cost-effective answer to meeting energy needs, although this can depend on location, availability of other options etc. PV modules form the sloping roofs of the atrium spaces in the four main buildings. The modules generate enough power to drive the mechanical ventilation system, and also provide shading for the atrium spaces below. Solar-heated Water for Domestic Houses Solar water heating has been installed on 35 properties in Wales owned by Gwalia Homes Housing Association. The active solar systems were funded by the National Assembly for Wales with a subsidy from the European Commission.