Hot air at 250°C flows across a 20°C surface. If the heat transfer coefficient is $81 W / (m^{2} \cdot ° C)$ , the heat transfer rate (W) over $$2m^2$$ of the surface is most nearly:

1 Answer

Nick O

Updated on December 24th, 2020

Apply the basic equation for convection, $\overset{\cdot}{Q} = h A ∆ T$ , where h is the the heat transfer coefficient, A is the area of the surface, and $∆ T$ is the temperature difference.

$\overset{\cdot}{Q} = (81) (2) (250 - 20) = 37 k W$

Privacy

Hot air at 250°C flows across a 20°C surface. If the heat transfer coefficient is 81 W/(m2·°C), the heat transfer rate (W) over $$2m^2$$ of the surface is most nearly:

1 Answer

Nick O

Hot air at 250°C flows across a 20°C surface. If the heat transfer coefficient is $81 W / (m^{2} \cdot ° C)$ , the heat transfer rate (W) over $$2m^2$$ of the surface is most nearly: