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...careful building design and by the use of controls to switch off artificial lighting when there is sufficient natural light available. Active solar water heating and space heating This involves discrete solar collectors, usually mounted on the roof of a building, to gather solar radiation to provide hot water for washing or for space heating. Solar thermal power plants...

...adults and three children costing less than five times my salary.' There could be millions of possible designs meeting this specification; and there would be millions more designs not meeting the specification. How can the designer find a good design from all these millions of possibilities? One approach would be to try looking at them all, and judging which is the best....