4. Steam in a heating system flows through tubes whose outer…
4. Steam in a heating system flows through tubes whose outer diameter is and whose walls are maintained at a temperature of . Circular aluminum alloy fins () of outer diameter and constant thickness are attached to the tube, as shown in the figure. Heat is transferred to the surrounding air at , with a combined heat transfer coefficient of . (a). (4 pts) Determine the heat transfer rate for a single fin if the fin efficiency of a single fin is known to be