- Отрасли: Government
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A solar day; an interval between successive transits of the sun's center across an observer's meridian; the time thus measured is not equal to clock time.
Industry:Energy
A solar collector that uses reflective surfaces to concentrate sunlight onto a small area, where it is absorbed and converted to heat or, in the case of solar photovoltaic (PV) devices, into electricity. Concentrators can increase the power flux of sunlight hundreds of times. The principal types of concentrating collectors include: compound parabolic, parabolic trough, fixed reflector moving receiver, fixed receiver moving reflector, Fresnel lense, and central receiver. A PV concentrating module uses optical elements (Fresnel lense) to increase the amount of sunlight incident onto a PV cell. Concentrating PV modules/arrays must track the sun and use only the direct sunlight because the diffuse portion cannot be focused onto the PV cells. Concentrating collectors for home or small business solar water heating applications are usually parabolic troughs that concentrate the sun's energy on an absorber tube (called a receiver), which contains a heat-transfer fluid.
Industry:Energy
A solar absorber surface that has high absorbence at wavelengths corresponding to that of the solar spectrum and low emittance in the infrared range.
Industry:Energy
A solar array tracking system capable of rotating independently about two axes (e.g., vertical and horizontal).
Industry:Energy
A smokestack or flue for exhausting the products of combustion from a combustion appliance.
Industry:Energy
A smaller version of standard fluorescent lamps which can directly replace standard incandescent lights. These lights consist of a gas filled tube, and a magnetic or electronic ballast.
Industry:Energy
A small groove scribed into the surface of a solar photovoltaic cell which is filled with metal for contacts.
Industry:Energy
A slightly sloped roof, usually with a tar and gravel cover. Most commercial buildings use this kind of roof.
Industry:Energy
