Heat exchanger types (parallel and counter heat exchanger) and their temperature profiles

Question

Accepted Answer

Parallel and counter heat exchangers have different temperature profiles.

In a parallel heat exchanger, the hot and cold fluids flow in the same direction.
In a counter heat exchanger, the hot and cold fluids flow in opposite directions.
In a parallel heat exchanger, the temperature difference between the hot and cold fluids is constant.
In a counter heat exchanger, the temperature difference between the hot and cold fluids varies along the length of the exchanger.
Examples of parallel heat exchangers include plate heat exchangers and shell and tube heat exchangers.
Examples of counter heat exchangers include double pipe heat exchangers and spiral heat exchangers.

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