8. Solved Problem

Example 1: Comparison of \(\Delta T\) of Cocurrent and Countercurrent Flows Hot water (0.01 m\(^3\)/min) enters the tube side of a cocurrent shell and tube heat exchanger at 80oC and leaves at 50oC. Cold oil (0.05 m\(^3\)/min) of density 800 kg/m\(^3\) and specific heat of 2 kJ/(kg.K) enters at 20oC. The log mean temperature difference in oC  is approximately

2004-61

(a) 32 (b) 37 (c) 45 (d) 50

What is the log mean temperature difference if the flow is countercurrent?