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ConcentratingCollector

ConcentratingCollector - Sustainable Energy Science and...

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S ustainable E nergy S cience and E ngineering C enter Concentrating Collectors Collectors are oriented to track the sun so that the beam radiation will be directed onto the absorbing surface Collector: Receiver and the concentrator Receiver: Radiation is absorbed and converted to some other energy form (e.g. heat). Concentrator: Collector that directs radiation onto the receiver. The aperture of the concentrator is the opening through which the solar radiation enters the concentrator Source: Chapter 7 of Solar Engineering of thermal processes by Duffie & Beckman, Wiley, 1991 Reference: http://www.powerfromthesun.net/book.htm
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S ustainable E nergy S cience and E ngineering C enter a) Tubular absorbers with diffusive back reflector; b) Tubular absorbers with specular cusp reflector; c) Plane receiver with plane reflector; d) parabolic concentrator; e) Fresnel reflector f) Array of heliostats with central receiver Collector Configurations Goal: Increasing the radiation flux on receivers
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S ustainable E nergy S cience and E ngineering C enter Concentrating Collectors Fresnel Lens: An optical device for concentrating light that is made of concentric rings that are faced at different angles so that light falling on any ring is focused to the same point. Parabolic trough collector: A high-temperature (above 360K) solar thermal concentrator with the capacity for tracking the sun using one axis of rotation. It uses a trough covered with a highly reflective surface to focus sunlight onto a linear absorber containing a working fluid that can be used for medium temperature space or process heat or to operate a steam turbine for power or electricity generation. Central Receiver: Also known as a power tower , a solar power facility that uses a field of two-axis tracking mirrors known as heliostat ( A device that tracks the movement of the sun). Each heliostat is individually positioned by a computer control system to reflect the sun's rays to a tower-mounted thermal receiver. The effect of many heliostats reflecting to a common point creates the combined energy of thousands of suns, which produces high-temperature thermal energy. In the receiver, molten nitrate salts absorb the heat energy. The hot salt is then used to boil water to steam, which is sent to a conventional steam turbine- generator to produce electricity.
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