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Probe Measures Fouling As In Heat ExchangersCombustion deposits reduce transfer of heat. Instrument measures fouling like that on gas side of heat exchanger in direct-fired boiler or heat-recovery system. Heat-flux probe includes tube with embedded meter in outer shell. Combustion gases flow over probe, and fouling accumulates on it, just as fouling would on heat exchanger. Embedded heat-flow meter is sandwich structure in which thin Chromel layers and middle alloy form thermopile. Users determine when fouling approaches unacceptable levels so they schedule cleaning and avoid decreased transfer of heat and increased drop in pressure fouling causes. Avoids cost of premature, unnecessary maintenance.
Document ID
19900000418
Acquisition Source
Legacy CDMS
Document Type
Other - NASA Tech Brief
Authors
Marner, Wilbur J.
(Caltech)
Macdavid, Kenton S.
(Caltech)
Date Acquired
August 14, 2013
Publication Date
August 1, 1990
Publication Information
Publication: NASA Tech Briefs
Volume: 14
Issue: 8
ISSN: 0145-319X
Subject Category
Mechanics
Report/Patent Number
NPO-17322
Accession Number
90B10418
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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