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Люба в категроии Английский язык, вопрос открыт 25.05.2018 в 08:13

Capturing Energy from the Sun

Solar energy can be collected in three main ways: photovoltaic (PV) cells, solar collectors and solar furnaces. The first are used to convert sunlight directly into electricity. They are known to be first introduced in 1958 in order to power satellites in space. Now the cells seem to run everything from lighting systems to water pumps not to mention pocket calculators. At the Sydney Olympic village more than 8,000 photovoltaic panels that cover over 6,000 square metres provide 650 kilowatts of electricity. All houses in the Olympic village have PV cells built into the roof, to make the most of sunlight that falls on them.
Hot water for the village is supplied by solar thermal heating systems. Such systems include solar panels on the roof and large solar collectors. These are normally dark in order to absorb more sunlight. Their surface is covered with glass to let in the rays but hold heat. The heat is transferred to water, which runs through small pipes. The hot water is then circulated through the house. Solar thermal heaters are believed to reduce water-heating costs by about 50% as some still use natural gas as a back up on cloudy days. It is estimated that 40 million solar heated buildings will be constructed in the near future.
The Olympic village is likely to be converted to housing for ordinary citizens now the games are over, and the houses are expected to generate electricity for years to come. The village is one of the largest housing developments in the world to use solar electric power.