Question

A 6.38-in-wide and 27-in-high vertical hot surface in 78°F air is to be cooled by a heat sink with equally spaced fins of rectangular profile. The fins are 0.08 in thick and 27 in long in the vertical direction and have a height of 1.2 in from the base. Consider base temperature to be 180°F. Given: The properties of air at 1 atm and the film temperature at 129°F. k = 0.01597 Btu/h.ft.°F v = 0.1975 x 10-3 ft2/s, Pr = 0.7217, g = 32.2 ft/s2

A.

Determine the optimum fin spacing of the heat sink in inches.

B.

Determine the rate of heat transfer by natural convection from the heat sink.

____Btu/h

Answer 1