Variation of Solar-Selective Properties of Black Chrome with Plating Time

Technical Report · Thu May 01 04:00:00 EDT 1975

DOI:https://doi.org/10.2172/7348343· OSTI ID:7348343

McDonald, Glen E. ^[1]; Curtis, Henry B. ^[1]

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1. NASA Lewis Research Center, Cleveland, OH (United States)

The spectral reflectance properties of a commercially prepared black chrome over dull nickel, both plated on steel, for various plating times of the black chrome were measured. The plating current was 180 amperes per square foot. The following values of absorptance α integrated over the solar spectrum, and of infrared emittance ϵ integrated over black-body radiation at 250°F were obtained for the plating times. The heat absorbed over the solar spectrum for insolation of 250 Btu/hr-ft², and the heat lost by radiation at a plate temperature of 250°F in radiation equilibrium with a 100°F body were each calculated for the various combinations of α and ϵ given above. The results indicate that plating between one and two minutes produces the optimum combination of highest heat absorbed and lowest heat lost by radiation.

• Research Organization: NASA Lewis Research Center, Cleveland, OH (United States)
• Sponsoring Organization: National Aeronautics and Space Administration (NASA)
• OSTI ID: 7348343
• Report Number(s): NASA-TM-X--71731
• Country of Publication: United States
• Language: English

Related Subjects

14 SOLAR ENERGY
141000* -- Solar Collectors & Concentrators
CHROMIUM
COATINGS
DEPOSITION
ELECTRODEPOSITED COATINGS
ELECTRODEPOSITION
ELECTROLYSIS
ELECTROPLATING
ELEMENTS
FABRICATION
LYSIS
METALS
OPTICAL PROPERTIES
PHYSICAL PROPERTIES
PLATING
SPECTRALLY SELECTIVE SURFACES
SURFACE COATING
SURFACES
TRANSITION ELEMENTS