Question: You have to design a 1-2 (one shell pass, two tube pass) shell and tube heat exchanger (STHE) for heating milk from 40 C to

You have to design a 1-2 (one shell pass, two tube pass) shell and tube heat exchanger (STHE) for heating milk from 40 C to 73-C with a flow rate of 5 kg/s. Milk is flowing in tube side. Heating will be accomplished by steam having a gauge pressure of 97.2 kPa and condensing in the shell side. The STHE contains 86 tubes, 1 in Outer Diameter (OD) 16 BWG (British Wire Gauge) stainless steel tubes arranged in staggered pitch with longitudinal and transverse pitches of S=S,*

The shell has inner diameter of 15 in and outer diameter of 16 in.

Assume surface

temperature (T.) at the outer surface of inner tube as 115 C

The milk side fouling

coefficient is 0.0005 mC/W.

1 in=2.54 cm

atm=101.325

If the STHE is located in a plant where ambient temperature is at 20 C, to prevent heat loss what do you recommend. Your recommendations should based on calculations.

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