A double pipe heat exchanger is to be designed to cool 5 gal/min of hot oil...

A double pipe heat exchanger is to be designed to cool 5 gal/min of hot oil from 250°F to 120°F using 10 gal/min of cooling water available at 70°F. The heat exchanger is to consist of sections of 0.75 inch 16 BWG copper tubing inside 1.5 inch 16 BWG tubing; the water flows in the annular space. The shell-side heat transfer coefficient for this system is known to be 737 Btu/hr×ft²×°F.

a) Estimate the required length of the countercurrent exchanger, neglecting the resistance of the tube wall in your calculations.

b) Estimate the required lengthof the exchanger if operated co-currently

The following data are available:

	Oil	Water
C_p (Btu/lb_m°F)	0.55	0.98
density (lb_m/ft³)	52	62.3
viscosity (cP)	2.2	1.0
k (Btu/hr ft°F)	0.077	0.361

Wall thickness for 16 BWG = 0.065 in.

Expert Solution

Amanda K answered 2 years ago

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