Solar radiation absorbed by various materials
Title: Limiting Effects of Temperature on the Performance of a Si-PV Array in Trinidad and Tobago Author: Nia Thompson Subject: This presentation/poster was presented at the 2015 NREL Photovoltaic Module Reliability Workshop, held Tuesday, February 24 Friday, February 27, in Golden, Colorado.
Absorbed Solar Radiation by Surface Color
Solar energy absorbed depends on surface color:
Surface Color | Absorb Factor - Fraction of Incident Radiation Absorbed (approximated) |
---|---|
White smooth surfaces | 0.25 - 0.40 |
Grey to dark grey | 0.40 - 0.50 |
Green, red and brown | 0.50 - 0.70 |
Dark brown to blue | 0.70 - 0.80 |
Dark blue to black | 0.80 - 0.90 |
Absorbed Solar Radiation by Material
Substance | Absorb Factor - Fraction of Incident Radiation Absorbed |
---|---|
Aluminum, polished | 0.30 |
Aluminum paint | 0.20 |
Aluminum, anodized | 0.15 |
Brick, glazed | 0.35 |
Brick, common light red | 0.55 |
Brick, common red | 0.68 |
Brick, wire cut red | 0.52 |
Brick, blue | 0.89 |
Cork | 0.45 |
Limestone, light | 0.35 |
Limestone, dark | 0.50 |
Linoleum, red-brown | 0.84 |
Sandstone, light grey | 0.62 |
Sandstone, red | 0.73 |
Marble, white | 0.44 |
Soft rubber, gray | 0.65 |
Marble, dark | 0.66 |
Granite, reddish | 0.55 |
Magnesium oxide, evaporated | 0.08 |
Graphite | 0.84 |
Porcelain | 0.50 |
Steel, vitreous enameled green | 0.76 |
Steel, vitreous enameled dark red | 0.81 |
Steel, vitreous enameled blue | 0.80 |
Iron, galvanized new | 0.64 |
Iron, galvanized dirty | 0.92 |
Iron, galvanized white washed | 0.22 |
Concrete | 0.60 |
Copper, polished | 0.18 |
Copper, tarnished | 0.64 |
Lead, old | 0.79 |
Asbestos cement, roof tiles old | 0.83 |
Asbestos cement, roof tiles red | 0.69 |
Asbestos slate | 0.81 |
Asphalt roofing, new | 0.91 |
Asphalt roofing, old | 0.82 |
Bitumen-covered roofing sheet, brown | 0.87 |
Slate, blue grey | 0.87 |
Tile, clay red | 0.64 |
Tile, concrete uncolored | 0.65 |
Tile, concrete black | 0.91 |
Vitreous enamel, white | 0.39 |
White Dutch tile | 0.18 |
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