Directly or indirectly, virtually all energy we use is
derived from solar energy: wind is created when solar energy creates
differences of temperature on areas of the earth’s surface, biomass energy is
derived from solar energy that has been captured and stored and fossil fuels
are derived from biomass that has been trapped and transformed by geological
processes over millions of years. In addition to the many indirect ways we use
the sun’s energy, there are three main ways that we use solar energy directly:
Passive Solar
Passive solar is when buildings directly take advantage
of solar energy. A green house is an example of a passive solar structure.
While virtually all structures capture passive solar energy to some extent,
sophisticated passive solar buildings are precisely designed to take maximum
advantage of solar energy during the course of year. A trombe wall is an
example of passive solar technology: this is a when a wall (often dark colored)
with large amounts of thermal mass is placed between large south facing windows
and the main building.
Solar Thermal
Solar thermal systems actively collect, transport and
utilize solar energy to generate heat. The most common systems are those used
to heat water but there are also systems designed for other applications like
space heating and cooking.
Solar Photovoltaic:
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