Radiation heat transfer between parallel plates

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SUMMARY

The discussion focuses on calculating the heat transfer and final temperatures of two parallel plates exchanging radiation. The primary formula used is $$q=\frac{\sigma (T_{1}^{4}-T_{2}^{4})}{\frac{1}{\varepsilon_{1}}+\frac{1}{\varepsilon_{2}}-1}$$, where $$\sigma$$ is the Stefan-Boltzmann constant, and $$T_{1}$$ and $$T_{2}$$ are the initial temperatures of the plates. The participants explore the complexities of reaching steady-state temperatures, emphasizing the importance of thermal capacity and energy flow. A numerical simulation indicates that the final temperatures are approximately $$310 \ K$$, which contrasts with analytical predictions that yield incorrect results.

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  • #31
FEAnalyst said:
is there a way to calculate the final temperatures of the plates (in steady state, when the amount of heat known from above equation will be exchanged)?
##T_{final}## given ##T_1## and ##T_2## ? Stefan-Boltzmann equation : juggling, thereof.

For the two values given : 293.15K , 373.15K , the results of that (radiative) and the heat-conduction equation mentioned differ by ~2%.

Do the algebra first. Waaaay less messy.
 

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