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Solar collector overheating protection

Authors
Journal
Solar Energy
0038-092X
Publisher
Elsevier
Publication Date
Volume
83
Issue
7
Identifiers
DOI: 10.1016/j.solener.2009.01.001
Keywords
  • Solar Thermal Collector
  • Total Reflection
  • Overheat Protection
  • Optical Switch
  • Prismatic Structure

Abstract

Abstract Prismatic structures in a thermal solar collector are used as overheating protection. Such structures reflect incoming light efficiently back whenever less thermal power is extracted from the solar collector. Maximum thermal power is generated when the prismatic structure is surrounded by a switching fluid with an index of refraction comparable to that of the prismatic structure. Thermal heat can be harvested via extra fluid channels in the solar absorber or directly via the switching fluid near the prisms. The light reducing effect of prismatic structures is demonstrated for a typical day and a season cycle of the Earth around the Sun. The switchability and the light reducing effect are also demonstrated in a prototype solar collector.

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