Thermal capacitance/Heat Transfer

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In heat transfer, specific heat capacity does not significantly impact steady-state conditions, as thermal conductivity and emissivity are more critical factors. When an electrical component dissipates power, the temperature reached depends on the thermal transfer characteristics of the materials involved rather than their specific heat. While aluminum and copper may initially respond differently to heat due to their specific heat capacities, they will eventually reach the same temperature under steady-state conditions if subjected to the same energy input. Transient heat dissipation can cause variations in temperature response based on the materials used for the heatsink. Understanding these principles is essential for effective thermal management in electronic components.
vettett15
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Guys,

Maybe someone can help, as I am having a brain fart here trying to think of how this all works. Say for instance I have an electrical part that dissipates 10 W of power and I am removing this power through the use of a thermal strap to a heatsink.



I think the problem I am having is I don't see how specific heat plays into heat transfer since the specific heat can tell you for a given energy input this is how hot your part will get. Doesn't thermal transfer depend on the temperature of the two parts. Does specific heat not matter at steady state? Would an aluminum and copper part reach the same temperature eventually given the same energy?

Dazed and confused,
Pete
 
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You are right. The SHC doesn't count in the long term - just the conductivity / emissivity etc.. The effect of transient bursts of high device dissipation could be different for different heat sink materials and shapes, though.
 
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