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Title: Heat loss reduction techniques for annular solar receiver designs

Abstract

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.

Authors:
;
Publication Date:
Research Org.:
Sandia Labs., Albuquerque, NM (USA)
OSTI Identifier:
6070553
Report Number(s):
SAND-78-1769
DOE Contract Number:  
EY-76-C-04-0789
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
14 SOLAR ENERGY; PARABOLIC TROUGH COLLECTORS; HEAT LOSSES; ANNULAR SPACE; ARGON; BLACK CHROME; DESIGN; ENERGY LOSSES; EVACUATED COLLECTORS; FREONS; HEAT TRANSFER FLUIDS; KRYPTON; SOLAR ABSORBERS; SPECTRALLY SELECTIVE SURFACES; SULFUR FLUORIDES; XENON; BLACK COATINGS; COATINGS; CONCENTRATING COLLECTORS; CONFIGURATION; ELEMENTS; FLUIDS; FLUORIDES; FLUORINE COMPOUNDS; HALIDES; HALOGEN COMPOUNDS; HALOGENATED ALIPHATIC HYDROCARBONS; LOSSES; NONMETALS; ORGANIC COMPOUNDS; ORGANIC HALOGEN COMPOUNDS; PARABOLIC COLLECTORS; RARE GASES; REFRIGERANTS; SOLAR COLLECTORS; SULFUR COMPOUNDS; SURFACES; 141000* - Solar Collectors & Concentrators

Citation Formats

Ratzel, A.C., and Simpson, C.E. Heat loss reduction techniques for annular solar receiver designs. United States: N. p., 1979. Web.
Ratzel, A.C., & Simpson, C.E. Heat loss reduction techniques for annular solar receiver designs. United States.
Ratzel, A.C., and Simpson, C.E. Thu . "Heat loss reduction techniques for annular solar receiver designs". United States.
@article{osti_6070553,
title = {Heat loss reduction techniques for annular solar receiver designs},
author = {Ratzel, A.C. and Simpson, C.E.},
abstractNote = {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.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1979},
month = {2}
}

Technical Report:
Other availability
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