Question

value 12.50 points 1 out of 3 attempts Hot air at 85°C is blown over a 1.9-mx 3.9-m flat surface at 21°C. If the convection heat transfer coefficient is 51 W/㎡.oC, determine the rate of heat transfer from the air to the plate. kW

Answer 1

1. Given values

Temperature of hot air T₂ = 85⁰ C

Dimension of flat surface = $1.9m \times 3.9m$

Temperature of flat surface, T₁ = 21⁰C

Coefficient of heat transfer, h = 51W/m^{2 0}C

2. Step 2

Area of flat surface = 1.9*3.9 = 7.41m²

Heat transfer rate by convection is given by

Qcon = hA (T₂-T₁) = 51 * 7.41 (85-21)

Qcon = 26083.2 W

Qcon = 26.0832 KW

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