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An Aluminium bar is 3.25m long and has a diameter of 25mm. If the temperature difference between the ends is 250°C, find the rate of heat transfer along the bar. (Where the Thermal conductivity for Al is 205W/m°C)

is it 5.67 W, 7.74 W, or 10.5 W?

Respuesta :

smmwaite

Answer

7.74 W


Explanation

The formula for getting the the rate of heat transfer is:

[tex]\frac{Q}{T}[/tex]=[tex]\frac{KA(T2 - T1) }{d}[/tex]

A = πr² = π×(12.5/1000)²

            = 4.908×10⁻⁴m²

Rate of heat transfer   = [tex]\frac{205*4.908×10⁻⁴*250}{3.25}[/tex]

                                      = 7.74 W


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