Emittance theory for thin film selective emitter

Conference · Mon Aug 01 04:00:00 EDT 1994

OSTI ID:6776342

Chubb, D L; Lowe, R A; Good, B S

Thin 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).

• Research Organization: National Aeronautics and Space Administration, Cleveland, OH (United States). Lewis Research Center
• OSTI ID: 6776342
• Report Number(s): N-95-11903; NASA-TM--106727; E--9097; NAS--1.15:106727; CONF-9407100--; CNN: RTOP 233-01-0A
• Country of Publication: United States
• Language: English

Related Subjects

14 SOLAR ENERGY
140501* -- Solar Energy Conversion-- Photovoltaic Conversion
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
CHALCOGENIDES
CONVERSION
DIRECT ENERGY CONVERSION
DIRECT ENERGY CONVERTERS
ELEMENTS
EMISSIVITY
ENERGY CONVERSION
ENERGY TRANSFER
EQUIPMENT
ERBIUM
FERRITE GARNETS
FILMS
HEAT TRANSFER
HOLMIUM
METALS
MINERALS
OPTICAL PROPERTIES
OXIDE MINERALS
OXIDES
OXYGEN COMPOUNDS
PHOTOELECTRIC CELLS
PHOTOVOLTAIC CELLS
PHOTOVOLTAIC CONVERSION
PHYSICAL PROPERTIES
RADIANT HEAT TRANSFER
RARE EARTHS
SILICATE MINERALS
SOLAR EQUIPMENT
SPECTRALLY SELECTIVE SURFACES
SURFACE PROPERTIES
SURFACES
THIN FILMS
TRANSITION ELEMENT COMPOUNDS
YTTRIUM COMPOUNDS