Counter Flow Heat Exchanger Example

For a parallel flow heat exchanger n 0 and for a counterflow heat exchanger n 1.

Counter flow heat exchanger example.

Crossflow parallel flow and counterflow heat exchanger configurations are three examples. The simplest heat exchanger is one for which the hot and cold fluids move in the same or opposite directions in a concentric tube or double pipe construction. In parallel flow heat exchangers the two fluids enter the exchanger at the same end and travel in parallel to one another to the other side. The direction in which the two fluids travel through the heat exchanger can be either parallel flow or counter flow.

There are three primary classifications of heat exchangers according to their flow arrangement. The counter current design is the most efficient in that it can transfer. In counter flow heat exchangers the fluids enter the exchanger from opposite ends. A thermoconductive membrane or an open section allows heat transfer between the two flows.

In a shell and tube heat exchanger coolant usually flows through the central tube core to cool hot oil water or air which passes over and around the tubes. Two tubes have a liquid flowing in the same direction. A heat exchanger can have several different flow patterns. Consider a parallel flow or counterflow heat exchanger consisting of fluid 1 fluid 2 and the wall separating these two fluids.

One starts off hot at 60 c the second cold at 20 c. In the parallel flow arrangement of figure 18 8 a the hot and cold fluids enter at the same end flow in the same direction and leave at the same end.