Chemical and Material Engineering Department
	CHE435L UNIT OPERATIONS LABORATORY
	Instructor: Thuan Ke Nguyen Office Hours

TKN page	CHE 435 Home	Syllabus	Assignments	Column
Heat Exchanger	Fluidized Bed	Batch Reactor	Superheat	Distillation

Double-Pipe Heat Exchanger

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We have recently purchased a double-pipe heat exchanger and wish to check on its performance. We plan to use the exchanger to study the variation of the overall heat transfer coefficient with flow rate. The exchanger has been piped to permit counter and parallel flow operation. The tube outer diameter is 15 mm with a wall thickness of 0.7 mm. The shell outer diameter is 22 mm with a wall thickness of 0.9 mm. The length for heat transfer is 1.5 m.

Determine the overall heat transfer coefficient for the exchanger using both experimental data and generalized correlations. Would you expect the overall heat transfer coefficient to be different for counter and parallel flow operation?

The overall heat transfer coefficient can be based on the inside or the outside surface area of the tubes. You can use the correlations given in Incropera for flow inside a pipe (Ref. 1, pg. 480). Be sure to use the equivalent diameter for the flow in the annular space.

References

1. Incropera, F. P. and DeWitt D. P, Fundementals of Heat and Mass Transfer, Wiley, 1996, pg. 460.
2. Hanesian, D. and Perna A. J., "A Laboratory Manual for Fundamentals of Engineering Design", NJIT.
3. Walas S. M., "Chemical Process Equipment, Selection and Design", Butterworths, 1988.

• Pre-requisite: CHE313