Page 449 - Handbook of Energy Engineering Calculations

Fouling, Eq. (12):

Plate, Eq. (10):

Sum of Products (SOP):
SOP = 0.848 + 0.927 + 0.050 + 0.052 = 1.877(18.6m)

Because SOP is greater than 1, the assumed heat exchanger is inadequate.
The surface area must be enlarged by increasing the plate width or the plate
length. Because, in all equations, L applies directly, the following new length
is adopted:

1.877 × 32.5 = 61 ft

5. Compute the pressure drops in the hot and cold sides
Hot side, Eq. (15):

Cold side, Eq. (15):

Because the pressure drop is less than the allowable, the spacing can be