Question

Section C – shell and tube heat exchanger sizing
The vapour condenser for the combined gas-steam power cycle described in Section B heats river
water from 15 °C to 18 °C. The condenser is a shell and tube heat exchanger with one shell pass and
two tube passes. The cooling water is inside the tubes while the shell side has the condensing vapour.
More details:
a. The tube OD is 1 ¼” (inches), the tube wall thickness is 0.05 inches. There are 400 tubes in
total.
b. The tube material is 316 Stainless Steel (SS). Assume that the effect of the steel’s thermal
conductivity is significant.
c. Steam condenses on the outer surface of the tubes with an associated convection coefficient
of 10000 W/m2.K. There is no fouling on the steam side of the tube surface.
Objectives:
1. Determine a fouling factor for the cooling river water and reference it.
2. Calculate the required mass flow rate of the cooling water.
3. Use the effectiveness-NTU method to determine the required tube length for the heat
exchanger. (Detail your calculations).

Answer 1

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