Saturated process steam at 1 atm is condensed in

Chapter 11, Problem 11.56

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Saturated process steam at 1 atm is condensed in ashell-and-tube heat exchanger (one shell, two tubepasses). Cooling water enters the tubes at 15?C with anaverage velocity of 3.5 m/s. The tubes are thin walledand made of copper with a diameter of 14 mm andlength of 0.5 m. The convective heat transfer coeffi-cient for condensation on the outer surface of the tubesis 21,800 W/m2?K.(a) Find the number of tubes/pass required to con-dense 2.3 kg/s of steam.(b) Find the outlet water temperature.(c) Find the maximum possible condensation rate thatcould be achieved with this heat exchanger usingthe same water flow rate and inlet temperature.(d) Using the heat transfer surface area found in part(a), plot the water outlet temperature and steamcondensation rate for water mean velocities in therange from 1 to 5 m/s. Assume that the shell-sideconvection coefficient remains unchanged.