Repeat Problem 11.14 for parallel flow in the exchanger and discuss the differences between parallel and countercurrent flow.

Prob. 11.14

Benzene vapor at 100°C is cooled and condensed at atmospheric pressure in a shell-and-tube exchanger. The cooling water enters at 20°C and leaves at 45°C. For countercurrent flow, calculate Δ̅T̅_L for the cooling and condensing sections of the exchanger. What fraction of the total heat is transferred in each section? The specific heat of benzene is 0.35 cal/g · °C and the heat of vaporization is 165 cal/g.