renewable energy sources and technology
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Renewable Energy Technologies
Renewable energy uses natural resources such as sunlight, wind, tides and geothermal heat which are naturally replenished. Most forms of renewable energy are cheap to operate, but relatively expensive to install, as they have to take quite dispersed energy and concentrate it into a useful form.
Until the industrial revolution almost all energy came from renewable sources, but much of it was used inefficiently. Modern technology can capture a lot more of this naturally occurring energy and convert it into electricity or useful heat.
Solar thermal - solar water heating collectors
The heat from solar energy can be captured by solar thermal panels. These panels absorb the energy from the sun and transfer it to heat water. Solar water heating systems are the most popular form of solar energy used in the UK. Solar water heating systems can typically provide over half of a household's hot water requirements over the year, but do not contribute towards central heating.
There are two types of solar water heating collector: flat plate and evacuated tubes. There are other active forms of solar heating, including ones designed to pre-heat air through sun spaces or solar walls.