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Emittance Theory for Thin Film Selective EmitterThin films of high temperature garnet materials such as yttrium aluminum garnet (YAG) doped with rare earths are currently being investigated as selective emitters. This paper presents a radiative transfer analysis of the thin film emitter. From this analysis the emitter efficiency and power density are calculated. Results based on measured extinction coefficients for erbium-YAG and holmium-YAG are presented. These results indicated that emitter efficiencies of 50 percent and power densities of several watts/sq cm are attainable at moderate temperatures (less than 1750 K).
Document ID
19950005490
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Chubb, Donald L.
(NASA Lewis Research Center Cleveland, OH, United States)
Lowe, Roland A.
(NASA Lewis Research Center Cleveland, OH, United States)
Good, Brian S.
(NASA Lewis Research Center Cleveland, OH, United States)
Date Acquired
September 6, 2013
Publication Date
August 1, 1994
Subject Category
Energy Production And Conversion
Report/Patent Number
NAS 1.15:106727
NASA-TM-106727
E-9097
Meeting Information
Meeting: Conference on Thermophotovoltaic Generation of Electricity
Location: Copper Mountain, CO
Country: United States
Start Date: July 24, 1994
End Date: July 26, 1994
Accession Number
95N11903
Funding Number(s)
PROJECT: RTOP 233-01-0A
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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