Why do painted stainless steel or aluminum control panels dissipate more heat than un

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Why do painted stainless steel or aluminum control panels dissipate more heat than un
Why do painted stainless steel or aluminum control panels dissipate more heat than un

aluminiumsheet > 08-17-2018, 06:43 AM

Metals have lower emissivity, and anodized aluminum lower than stainless steel unpolished, thus they need a higher temperature than a painted surface, for example black, to radiate the same amount of heat to the surroundings. Conversely, for the same surface temperature, painted metals radiate more heat than unpainted ones.
RE: Why do painted stainless steel or aluminum control panels dissipate more heat than un

lolitahe69 > 08-17-2018, 06:44 AM

If the unpainted metals are not heavily oxidized (corroded), then painted metals will radiate more heat since the hemispherical IR emittances of organic finishes is much higher than for unpainted metals. Radiated IR energy (heat) is proportional to the IR emittance. The higher the emittance the greater the radiated heat. The IR emittances are properties only of the finishes and don’t depend on the host material. Usually a shiny metal surface has a much lower IR emittance than a painted surface.
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