Question

# Water at a flow rate of 60 kg/s enters the shell-side of a baffled shell-and-tube heat...

Water at a flow rate of 60 kg/s enters the shell-side of a baffled shell-and-tube heat exchanger at 35 °C and leaves at 25 °C. The heat will be transferred to 150 kg/s of raw water coming from a supply at 15 °C. You are requested to design the heat exchanger for this purpose. A single shell and single tube pass is preferable. The tube diameter is ¾ in. (19 mm outer diameter with 16 mm inner diameter) and tubes are laid out on 1 in. square pitch. The water velocity in a single tube is 2.5 m/s. Maximum length of the heat exchanger 5 m is required because of space limitations. The tube material has k=70 W/m·K. Assume a total fouling resistance of 0.000176 m2·K/W. Baffle spacing is 650 mm. Reasonable design assumption can be made along with the calculation if it is needed. Calculate: The number of tubes, shell diameter, overall heat transfer coefficient and the length of the heat exchanger. Is this design acceptable?

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