A 25 C water stream flowing at 90 kg/min in a process needs to be heated up by 10 C. Saturated steam at 40 C is available as the heating fluid. Your job is to design the single-pass shell and tube heat exchanger to do the job. Your boss tells you that 3-cm diameter thin-walled copper tubing is available and that your design should have the water flow inside the tube horizontally and have the steam condense on the outside of the tube in the shell side of the heat exchanger. How long will the heat exchanger need to be (in m)?

Answer should be 17.3 meters.