Repeat Prob. 7–32 for a location at an elevation of 1610 m where the atmospheric pressure is 83.4 kPa.

Data from problem 32

An array of power transistors, dissipating 6 W of power each, are to be cooled by mounting them on a 25-cm × 25-cm-square aluminum plate and blowing air at 35°C over the plate with a fan at a velocity of 4 m/s. The average temperature of the plate is not to exceed 65°C. Assuming the heat transfer from the back side of the plate to be negligible and disregarding radiation, determine the number of transistors that can be placed on this plate.

Transcribed Image Text:

35°C Air 4 m/s Aluminum plate ↑ 25 cm Power transistor, 6 W 25 cm 65°C