Heat loss reduction techniques for annular solar receiver designs
Analytical and experimental work has been undertaken to quantify thermal conduction and natural convection heat losses in annular solar receiver geometries. Techniques studied for reducing conduction heat loss include evacuation of the annulus gas, oversizing of the annualar space while maintaining slight vacuum levels, and use of gases other than air in the annular space. The receiver configuration chosen for study is typical of those used in the Midtemperature Solar Systems Test Facility at Sandia Laboratories. The receiver tube has a black-chrome selective coating and is 2.54 cm in outside diameter. The inside diameter of the glass envelope is approximately 4.4 cm. Typical maximum operating temperatures of the receiver tube and glass envelope are approximately 589 K and 373 K, respectively.
- Research Organization:
- Sandia Labs., Albuquerque, NM (USA)
- DOE Contract Number:
- EY-76-C-04-0789
- OSTI ID:
- 6070553
- Report Number(s):
- SAND-78-1769
- Country of Publication:
- United States
- Language:
- English
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Techniques for reducing thermal conduction and natural convection heat losses in annular receiver geometries
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Related Subjects
141000* -- Solar Collectors & Concentrators
ANNULAR SPACE
ARGON
BLACK CHROME
BLACK COATINGS
COATINGS
CONCENTRATING COLLECTORS
CONFIGURATION
DESIGN
ELEMENTS
ENERGY LOSSES
EVACUATED COLLECTORS
FLUIDS
FLUORIDES
FLUORINE COMPOUNDS
FREONS
HALIDES
HALOGEN COMPOUNDS
HALOGENATED ALIPHATIC HYDROCARBONS
HEAT LOSSES
HEAT TRANSFER FLUIDS
KRYPTON
LOSSES
NONMETALS
ORGANIC COMPOUNDS
ORGANIC HALOGEN COMPOUNDS
PARABOLIC COLLECTORS
PARABOLIC TROUGH COLLECTORS
RARE GASES
REFRIGERANTS
SOLAR ABSORBERS
SOLAR COLLECTORS
SPECTRALLY SELECTIVE SURFACES
SULFUR COMPOUNDS
SULFUR FLUORIDES
SURFACES
XENON