Page 461 - Handbook of Energy Engineering Calculations

Both the shellside and tubeside pressure drops are much lower than the

allowable. Therefore, the next step is to try the next-smaller exchanger, which
has a tube length of 19.14 ft.

5. Correct the heat-transfer factors, if necessary
The four preceding heat-transfer factors must now be corrected as follows:

The new SOP becomes:
SOP = 0.205 + 0.381 + 0.359 + 0.056 = 1.001
This exchanger, which is adequate for heat transfer, will have the following
pressure drops:
Tubeside:

Shellside:
2
2
ΔP = 0.163(27.5/19.14) = 0.336 Ib/in (2.3KPa)
The second exchanger selected is adequate with respect to heat transfer and

pressure drop for both fluids. An exchanger with the same transfer area but
with larger tubes would be more expensive. One with fewer or smaller tubes
would have an excessive tubeside pressure drop.

6. Summarize the final design chosen