Thermal capacitance/Heat Transfer

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SUMMARY

This discussion centers on the relationship between thermal capacitance, specific heat, and heat transfer in electronic components. The key point established is that specific heat does not influence steady-state temperature differences between materials, such as aluminum and copper, when subjected to the same energy input. Instead, thermal conductivity and emissivity are the primary factors affecting heat transfer efficiency. The transient response of different materials can vary, impacting short-term thermal performance.

PREREQUISITES
  • Understanding of thermal conductivity and emissivity
  • Basic knowledge of specific heat capacity
  • Familiarity with heat sink design principles
  • Concept of steady-state versus transient thermal analysis
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  • Research thermal conductivity of various materials used in heat sinks
  • Study the principles of transient thermal analysis in electronic components
  • Learn about the effects of emissivity on heat dissipation
  • Explore design techniques for optimizing heat sink performance
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Engineers and designers working in thermal management, electronics cooling specialists, and anyone involved in optimizing heat transfer in electronic devices.

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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