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ISSN Online: 2377-424X

ISBN Print: 0-89116-909-1

International Heat Transfer Conference 9
August, 19-24, 1990 , Jerusalem, Israel

A SPHERICAL RECEIVER-REACTOR WITH SPECULARLY REFLECTING INNER SURFACES FOR HIGH-TEMPERATURE SOLAR FURNACE APPLICATIONS

Get access (open in a dialog) DOI: 10.1615/IHTC9.570
pages 127-132

Resumo

For cavity receivers and reactors for solar furnaces at moderate to high (2000K and above) temperatures, we propose an alternative to conventional insulated enclosures. It consists of a spherical shell with specularly reflecting inner walls concentric with a spherical crucible (reactor). The crucible is centered at the focal point of the solar concentrator. An analysis of the energy exchange among the surfaces based on the radiosity concept was formulated. Specific view factors used in the energy balances on each of the pertinent surfaces permit us to calculate losses and collection efficiencies. A prototype was experimentally investigated. The new design offers, in contrast to conventional insulated cavity receivers, excellent thermal shock resistance and an extremely low thermal capacitance. Its large aperture admits more radiation from the concentrator than do conventional cavities. There is no need for to use expensive and difficult-to-fabricate ceramic insulating materials; its cost is about one-tenth that of a comparable conventional cavity. The theoretically calculated maximum achievable crucible temperature are compared with the maximum temperatures we observed experimentally.