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Hot air at 80°c is blown over a 2-m x 4-m flat surface at 45°c. if the average convection heat transfer coefficient is 55 w/m2·k, determine the rate of heat transfer from the air to the plate, in kw.

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Answer : The rate of heat transfer from air to plate is 22 KW

Explanation :

It is given that,

Temperature of flat surface,
T_1 = 30^0\ C

Temperature of flat surface,
T_2 = 80^0\ C

Area of surface,
A=8\ m^2

Heat coefficient,
H=55\ W/m^2K

So, rate of heat transfer,


Q=HA(T_2-T_1)


Q=55* 8* (80-30)


Q=55* 8* 50


Q=22000\ W


Q=22\ KW

Hence, the rate of heat transfer from air to plate is 22 KW

User Kshitij Banerjee
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