i have set up an equation to get the heat transfer rate Q for a combined system where heat is transfered from a cylindrical outer wall set at 500 C. the wall heats a gas, which in turn heats a solid block of cylindrical metal positioned in the centre of the heated walls with a starting temperature of 20 C.(adsbygoogle = window.adsbygoogle || []).push({});

the equation i have is

Q=[1]\frac{}{}[/(A0/(h*A_{lm1}))+((r*A0)/(k*A2))+(A0/(h*A_{lm3}))+((r*A0)/(k*A4))+(A0/(h*A_{lm5}))]*A0*[tex]\Delta[/tex]T

and it give a result of 11.3213 Watts or the situation above.

but too me this seems small?? am i right in thinking this?

also can anyone tell me how i can relate this heat transfer to time. ie. know how long it would take to heat the central metal part.

Thank you in advance.

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# Heat transfer rate to heating time

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