Question: Consider a 1 6 - cm x 2 1 - cm printed circuit board ( PCB ) that has electronic components on one side. The

Consider a 16-cm x 21-cm printed circuit board (PCB)that has electronic components on one side. The board is placed in a room at 20C. The heat loss from the back surface of the board is negligible. Assume that the circuit board dissipates 8 W of power in steady operation. Take the emissivity of the surface of the board to be 0.8 and assume the surrounding surfaces to be at the same temperature as the air in the room. Evaluate air properties at a film temperature of 32.5C and 1 atm pressure. Determine the average temperature of the hot surface of the board, assuming the board is vertical. 21-cm is vertically up.

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