Repeat Problem 2-125 for aluminum fins installed on a copper tube.
Problem 2-125
Calculate the R value for the fin-tube combination in Problem 2-116.
Problem 2-116
An aluminum fin is attached to a transistor that generates heat at the rate of 300 mW. The fin has a total surface area of 9.0 cm2 and is exposed to surrounding air at 27ºC. The contact conductance between transistor and fin is 0.9 × 10−4 m2 ∙ ºC/W, and the contact area is 0.5 cm2. Estimate the temperature of the transistor, assuming the fin is uniform in temperature.