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Aluminum - Radiation Heat Emissivity

Radiation heat emissivity of unoxidized, oxidized and polished aluminum

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The emissivity coefficient - ε - indicates the radiation of heat from a body according the Stefan-Boltzmann Law, compared with the radiation of heat from a ideal black body where the emissivity coefficient ε = 1.

The emissivity coefficient - ε - for some common qualities of aluminum:

Aluminum	Temperature ^oF (^oC)	Emissivity Coefficient - ε -
Unoxidized	77 (25)	0.02
Unoxidized	212 (100)	0.03
Unoxidized	932 (500)	0.06
Oxidized	390 (199)	0.11
Oxidized	1110 (599)	0.19
Oxidized at 1110^oF (599^oC)	390 (199)	0.11
Oxidized at 1110^oF (599^oC)	1110 (599)	0.19
Heavily Oxidized	200 (93)	0.20
Heavily Oxidized	940 (504)	0.31
Highly Polished	212 (100)	0.09
Roughly Polished	212 (100)	0.18
Commercial Sheet	212 (100)	0.09
Highly Polished Plate	440 (227)	0.04
Highly Polished Plate	1070 (577)	0.06
Bright Rolled Plate	338 (170)	0.04
Bright Rolled Plate	932 (500)	0.05
Alloy A3003, Oxidized	600 (316)	0.40
Alloy A3003, Oxidized	900 (482)	0.40
Alloy 1100-0	200-800 (93-427)	0.05
Alloy 24ST	75 (24)	0.09
Alloy 24ST, Polished	75 (24)	0.09
Alloy 75ST	75 (24)	0.11
Alloy 75ST, Polished	75 (24)	0.08

The relatively low emissivity coefficient makes aluminum a suitable product for limiting the radiated heat from a body. Its by example common to use aluminum coating in rescue and survival equipment for outdoor operations.

calculate radiation heat transfer from a hot body to colder surroundings

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Related Topics

Thermodynamics - Effects of work, heat and energy on systems

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