Air passes over a hot metal bar which has a surface area of 2.5 ft2. The temperature of the air is 70°F, while the bar has a temperature maintained at 280°F. If the convective heat transfer coefficient is 4 Btu/h-ft2-°F, determine the rate of convective heat transfer from the plate.
Given: A = 2.5 ft2; Tf = 70°C; Ts = 280°C; h = 4 Btu/h-ft2-°F
What will be an ideal response?
Qconv = hA(Tf -Ts) = (4 Btu/h-ft2-°F)(2.5 ft2)(70°F - 280°F) = -2,100 Btu/h
The heat is transferred from the the bar to the air.
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