2-137 A 10-cm high and 20-cm wide circuit board houses on its surface 100 closely spaced chips, each generating heat at a rate of 0.08 W and transferring it by convection to the surrounding air at 40°C. Heat transfer from the back surface of the board is negligible. If the convection heat transfer coefficient on the surface of the board is 10 W/m2 · °C and radiation heat transfer is negligble, the average surface temperature of the chips is a) 80°C b) 54°C c) 41°C d) 72°C e) 60°C | |
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