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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.

Respuesta :

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

Explanation :

It is given that,

Temperature of flat surface, [tex]T_1 = 30^0\ C[/tex]

Temperature of flat surface,[tex]T_2 = 80^0\ C[/tex]

Area of surface, [tex]A=8\ m^2[/tex]

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

So, rate of heat transfer,

[tex]Q=HA(T_2-T_1)[/tex]

[tex]Q=55\times 8\times (80-30)[/tex]

[tex]Q=55\times 8\times 50[/tex]

[tex]Q=22000\ W[/tex]

[tex]Q=22\ KW[/tex]

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

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