Question

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.

Answer 1

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