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On Indirectly Irradiated Solar Receiver-Reactors for High-Temperature Thermochemical Processes

[+] Author Affiliations
Christian Wieckert, Anton Meier

Paul Scherrer Institute, Villigen, Switzerland

Aldo Steinfeld

ETH-Swiss Federal Institute of Technology, Zurich, Switzerland

Paper No. SED2002-1059, pp. 251-255; 5 pages
  • ASME Solar 2002: International Solar Energy Conference
  • Solar Energy
  • Reno, Nevada, USA, June 15–20, 2002
  • Conference Sponsors: Solar Energy Division
  • ISBN: 0-7918-1689-3
  • Copyright © 2002 by ASME


A solar receiver-reactor concept for high-temperature thermochemical applications involving gas and condensed phases is presented. It features two cavities in series. The inner cavity is an enclosure, e.g. made of graphite, with a small aperture to let in concentrated solar power. It serves as the solar receiver, radiant absorber, and radiant emitter. The outer cavity is a well-insulated enclosure containing the inner cavity. It serves as the reaction chamber and is subjected to thermal radiation from the inner cavity. The advantages of such a two-cavity reactor concept are outlined. A radiation heat transfer analysis based on the radiosity enclosure theory is formulated and results are presented in the form of generic curves that indicate the design constraints. High energy absorption efficiency can be achieved by minimizing the aperture area, by maximizing the size of the inner cavity, and by constructing it from a material of high emissivity.

Copyright © 2002 by ASME



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