Appendix

For heat transfer in a typical PHE with turbulent flow one can write the heat transfer performance in terms of a di-mensionless Dittus—Boelter equation

For applications in turbulent flow it is usually sufficiently accurate to omit the Sieder—Tate viscosity ratio and therefore the equation reduces to

tions to eliminate Af, it is possible to arrive at equation A8 for the film heat-transfer coefficient.

where and

2.5 po z 2gpAP

The pressure drop can be predicted in a similar exchanger by equations A3 and A4.

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