Page 447 - Handbook of Energy Engineering Calculations

(W/HZ), where W = flow rate, lb/h/1000; H = channel width, in; Z = fluid
viscosity, cp. Substituting, we have, for the hot side, N = (10,000)
Re
(6225/1000)/(24)(3.35) = 774.4. For the cold side, N = (10,000)
Re
(5925/1000)/(24)(8) = 308.6. Because both fluids are in laminar flow, spiral
flow will be chosen for this heat exchanger. From Table 9, the appropriate

expressions for rating are Eq. (3) for both fluids, Eq. (10) for the plate, Eq.
(12) for fouling, and Eq. (15) for pressure drop.

TABLE 9 Empirical Heat-Transfer and Pressure-Drop Relationships
for Rating Spiral-Plate Heat Exchangers