Utilization of heavy fill gases in annular solar receiver geometries for heat loss reduction
Analytical and experimental work has investigated reducing thermal conduction and natural convection heat losses in annular solar receiver geometries using high molecular weight fill gases. Gases analyzed in a Sandia Laboratories prototype receiver design included nitrogen, argon, krypton, xenon, sulfur hexafluoride, and Freon C-318. Experimental results indicate that high molecular weight monatomic gases can reduce receiver heat loss by nearly 50%, comparable to annulus gas evacuation to the 5.0 to 5.0 x 10/sup -1/ Pa range. Computer simulation studies show that heavy gas utilization in the annular space can improve overall collector performance by 4.5 to 13.5%, depending upon the gas and annulus pressure.
- Research Organization:
- Sandia Labs., Albuquerque, NM (USA)
- DOE Contract Number:
- EY-76-C-04-0789
- OSTI ID:
- 5962843
- Report Number(s):
- SAND-79-0726C; CONF-791205-6
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
141000* -- Solar Collectors & Concentrators
AIR
ANNULAR SPACE
ARGON
COMPUTERIZED SIMULATION
CONFIGURATION
CONVECTION
CRYOGENIC FLUIDS
DATA
ELEMENTS
ENERGY LOSSES
ENERGY TRANSFER
FLUIDS
FLUORIDES
FLUORINE COMPOUNDS
FREONS
GASES
HALIDES
HALOGEN COMPOUNDS
HALOGENATED ALIPHATIC HYDROCARBONS
HEAT LOSSES
HEAT TRANSFER
INFORMATION
KRYPTON
LOSSES
NATURAL CONVECTION
NITROGEN
NONMETALS
ORGANIC COMPOUNDS
ORGANIC HALOGEN COMPOUNDS
PERFORMANCE
PHYSICAL PROPERTIES
PRANDTL NUMBER
RARE GASES
REFRIGERANTS
SIMULATION
SOLAR RECEIVERS
SULFUR COMPOUNDS
SULFUR FLUORIDES
THERMAL CONDUCTION
THERMAL DIFFUSIVITY
THERMODYNAMIC PROPERTIES
VISCOSITY
XENON