Reconsider the heat exchanger of Problem 6.38 with an inline tube arrangement, where the centerlines of the

Question:

Reconsider the heat exchanger of Problem 6.38 with an inline tube arrangement, where the centerlines of the tubes are spaced 7.5 cm apart, both in the longitudinal and transverse directions. Compare the results with those for the staggered tube arrangement and comment upon the difference. Also, which of the two arrangements is expected to have a larger pressure drop?

Data from in Problem 6.38

A multitube heat exchanger is used in a process plant to pre-heat air before it is enters a combustion chamber, using low pressure steam that flows inside the tubes and condenses. The tube bundle is configured with 6-cm outer diameter tubes in a staggered arrangement as shown in the accompanying figure. The condensing steam in the tubes maintains their outer surface temperature at 117°C, and air at 60° flows across the tube bank with a free stream velocity of 1.0 m/s. Determine the average heat transfer coefficient for air.