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

Question

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

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Thạch Thảo 3 years 2021-08-19T18:23:12+00:00 1 Answers 12 views 0

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  1. kiet
    0
    2021-08-19T18:25:00+00:00
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    Answer:

    A = 0.00704 m^2

    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 = \frac{100}{355 * 40}\\\\A = 0.00704 m^2

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