Extruded Finned Heat Sink Radiation Formulae

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Extruded Finned Heat Sink Radiation Formulae

Use the following equation to calculate the radiation from an extruded (finned) heat sink.

Where:

Q = Radiation
N_f = Number of fins heat sink has
T_s = Surface temperature of the heat sink
T_A= Ambient Temperature
= Apparent Emissitivity

( Apparent Emissitivity) is derived from the heat sink area and surface emittance.

Graph of apparent emissivity of 0.08

Apparent emissivity of 0.08

Graph of apparent emissivity of 0.8

Apparent emissivity of 0.8

References: "Thermal Radiation from Finned Heat Sinks"
Samuel Rea, S.E. West

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