Stress in Shaped Glass Evacuated Collectors

[+] Author and Article Information
J. D. Garrison

Physics Department, San Diego State University, San Diego, CA 92182

A. Fischer-Cripps

Applied Physics, University of Technology, Sydney, NSW 2007 Australia

J. Sol. Energy Eng 119(1), 79-84 (Feb 01, 1997) (6 pages) doi:10.1115/1.2871857 History: Received December 01, 1995; Revised August 01, 1996; Online February 14, 2008


Shaped glass evacuated collectors have the lower vacuum envelope formed with a CPC shape. The internal surface is silvered. This surface concentrates solar radiation onto an internal absorbing tube. The upper part of the vacuum envelope is a window to pass the solar radiation in to the absorbing tube. A computer program using analytical equations is used to design these collectors while keeping the glass tensile stress arising from evacuation below acceptable limits. A finite element computer program is used to test the accuracy of the stress calculated analytically. The calculations agree within about 1 MPa. Wind and thermal stresses in the glass are lower than the stresses caused by evacuation.

Copyright © 1997 by The American Society of Mechanical Engineers
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