Solar thermal collectors as the
name suggests are collectors designed to absorb the heat and radiation
from the sun and convert it into thermal energy. There are different
types of solar thermal collectors available, which can be sourced from
the market or can be built by individuals themselves. Solar thermal
collectors are basically of three types i.e. concentrating, flat-plate,
and evacuated tube.
Concentrating solar collectorsare usually used for commercial power production systems, as it can
generate large amount of energy due to its capacity to reach high
temperatures. More often, concentrating collectors is made of parabolic
troughs with a mirrored surface, which helps to concentrate and collect
the solar energy on the absorber tube. The absorber tubes either
contain water or heat transfer fluids. However, since these collectors
are largely dependent on direct sunlight they are not feasible in
places where the sun light is not abundant or in places which remain
cloudy for long periods of time.