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Heat
Transfer Engineering Knowledge
Finned Extruded Heat Sink Supplier
Use the following equation to calculate the radiation from an extruded (finned) heat sink.
Where:
Q = Radiation
Nf = Number of fins heat sink has
Ts = Surface tenperature of the heat sink
TA = Ambient Temperature
 = Apparent Emissitivity
( Apparent Emissitivity) is derived from the heat sink area and surface emittance.
Graph of apparent emissivity of 0.08 
Graph of apparent emissivity of 0.8 
References: "Thermal Radiation from Finned Heat Sinks"
Samuel Rea, S.E. West
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