An ideal gas. Cp = (7/2) R, is heated in a steady-flow heat exchanger from 70oC to 190oC by another stream of the same ideal gas which enters at 320oC. The flow rates of the two streams are the same, and heat losses from the exchanger are negligible.
a) Calculate the molar entropy changes of the two gas streams for both parallel and countercurrent flow in the exchanger.
(b) What is (Stotal in each case?
(c) Repeat ports (u) and (h) tor countercurrent flow if the heating stream enters at 200 C?