A parabolic trough collector (PTC) is a type of that is straight in one dimension and curved as a in the other two, lined with a polished metal . The which enters the mirror parallel to its plane of symmetry is focused along the , where objects are positioned that are intended to be heated. In a , for example, food is placed at the foc.
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A solar mirror contains a substrate with a reflective layer for reflecting the solar energy, and in most cases an interference layer. This may be a planar mirror or parabolic arrays of solar mirrors used to achieve a substantially concentrated reflection factor for solar energy systems. See article "Heliostat" for. .
Glass or metal substrateThe substrate is the mechanical layer which holds the mirror in shape. Glass may also be used as a protective layer to protect the other layers from abrasion and corrosion.. .
The use of solar mirrors as a form of for has been proposed to address local temperature increases as well as to decrease . Propositions have focused on the usage of solar mirrors both on the. .
(PV) which can convert solar radiation directly into are quite expensive per unit area. Some types of PV cell, e.g. , if cooled, are capable of converting efficiently up to 1,000 times as much radiation as is normally provided by. .
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The intensity of from at the surface of the is about 1 kilowatt per square metre (0.093 kW/sq ft), of area to the direction of the , under clear-sky conditions. When solar energy is unconcentrated, the maximum collector. .
Another advanced space concept proposal is the notion of space reflectors which reflect sunlight on to small spots on the night side of the Earth to provide night time illumination. An early proponent of this concept was Dr. , who wrote about.
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