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An electric circuit board is to be cooled by forced convection through cooling fins. Heat of 100W needs to be removed from this board from a maximum temperature of 40 degree Celsius above the room air temperature of 20 degree Celsius. The forced convection heat transfer coefficient is 355W/(m2K). Determine the required surface area of the fins. ANSWER IN m2

User Dariol
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1 Answer

4 votes

Answer:


A = 0.00704 m^2

Step-by-step explanation:

Amount of heat to be removed,
\dot{Q} = 100 W

Change in temperature,
\triangle T = 40^0 C

The room air temperature,
T_1 = 20^0C

The forced convection heat transfer coefficient, h = 355 W/(m²K)

Required surface area of the fins, A = ?

Given all the above parameters, the surface area of the fins is given by the formula:


A = \frac{\dot{Q}}{h * \triangle T} \\\\A = (100)/(355 * 40)\\\\A = 0.00704 m^2

User Sanjay Prajapati
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