Circumferential fins of rectangular profile are constructed of aluminum and attached to a copper tube having a diameter of 25 mm and maintained at 100ºC. The length of the fins is 2 cm and thickness is 2 mm. The arrangement is exposed to a convection environment at 30ºC with h = 15 W/m2 · ºC. Assume that a number of fins is installed such that the total fin surface area equals that of the total surface fine area in Problem 2-90. Calculate the total heat lost by the fins.
Problem 2-90
A finned tube is constructed as shown in Figure 2-10b. Eight fins are installed as shown and the construction material is aluminum. The base temperature of the fins may be assumed to be 100ºC and they are subjected to a convection environment at 30ºC with h = 15 W/m2 ∙ ºC. The longitudinal length of the fins is 15 cm and the peripheral length is 2 cm. The fin thickness is 2 mm. Calculate the total heat dissipated by the finned tube. Consider only the surface area of the fins.