An aluminum heat transfer surface that is maintained at 100C is in contact with air at 20C.
Question:
An aluminum heat transfer surface that is maintained at 100°C is in contact with air at 20°C. The film heat transfer coefficient between the surface and the air is estimated to be 42 W/m /K. Determine the area of bare surface equivalent required to transfer 4 kW of power and the enhancement in heat transfer for the following cases:
A bare flat metal surface
A flat metal surface equipped with 50 mm long, 3 mm wide rectangular aluminum fins placed on 10 mm centers
A flat metal surface equipped with 50 mm long, 3 mm wide-base triangular aluminum fins placed on 10 mm centers
A bare 1-in, 14 BWG tube
A 1-in, 14 BWG tube with 2-in diameter annular fins of constant thickness of 3 mm placed on 10 mm centers
A 1-in, 14 BWG tube with 3-in diameter annular fins of constant thickness of 3 mm placed on 10 mm centers
Step by Step Answer:
From Table 203 for aluminum at 100C k 206 WmK From Table 204 OD 1in 14 BWG tube is 254 mm 4000 42 80 Q 4000hAAT 42 A 10020 A The arrangement of the fins is shown in Figure E2014a 119 m 3 mm 50 mm 7 mm ...View the full answer
Analysis Synthesis And Design Of Chemical Processes
ISBN: 9780134177403
5th Edition
Authors: Richard Turton, Joseph Shaeiwitz, Debangsu Bhattacharyya, Wallace Whiting
