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Status
Electronic Resource
Call number
Publication
SAND Report: SAND89-0899, June 1989
Collection
Language
Library's review
ABSTRACT:
A liquid—metal pool-boiler solar receiver has been proposed to link a paraboloidal-dish concentrator to a Stirling heat engine operating in the temperature range 700-800 C. Preliminary to the construction of a full- scale receiver of this type, a bench-scale version using liquid sodium
A liquid—metal pool-boiler solar receiver has been proposed to link a paraboloidal-dish concentrator to a Stirling heat engine operating in the temperature range 700-800 C. Preliminary to the construction of a full- scale receiver of this type, a bench-scale version using liquid sodium
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was designed, built and tested. Conclusions drawn from the test included: (1) boiling instability will occur in the full-scale receiver unless special measures are taken, (2) boiling was stabilized in the bench-scale receiver after the addition of "artificial cavities", but other stabilizing influences may also have been present, (3) "hot restarts" can under some circumstances lead to unacceptably—high incipient-boiling superheats, (4) no thermal-fatigue damage was evident after 100 hours of boiling interspersed with 24 cooldown periods, (5) 0.01—inch— diameter sheathed thermocouples used to provide an estimate of heated—wall temperature survived over 100 hours at 830 C , (6) other instrumentation and control techniques that were tested were shown to be appropriate for future full- scale receiver tests. Show Less