Water with a mass flow rate of 30,000 lbm/hr is heated from 100 to 130 F in a tube and shell heat exchanger. A
single pass of water at 15,000 lbm/hr and 200 F is used on the shell side as the heating fluid. The overall heat
transfer coefficient is 250 Btu/hr-ft2-F and the average water velocity in the 0.75 inch I.D. tubes is 1.2 ft/sec.
Because of space limitations, the heat exchanger must be no longer than 8 feet. Consistent with this restriction,
calculate the number of tube passes, the number of tubes per pass, and the length of the tubes.