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What is concurrent flow heat exchanger ?

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Counter Flow Heat Exchanger

A counterflow heat exchanger has the hot fluid entering at one end of the heat exchanger flow path and thecold fluid entering at the other end of the flow path. Counter flow is the most common type of liquid-liquid heat exchanger, because it is the most efficient. A double pipe heat exchanger is usually operated as a counter flow heat exchanger, as shown in the diagram at the left. A picture of a double pipe heat exchanger is shown at the right. The flow pattern in a shell and tube heat exchanger with a single tube

pass will be approximately counterflow if it is long in comparison with its diameter. Because of the baffles and the need to distribute the flow of the shell side fluid over the cross-section of the shell, the flow is not as close to counterflow in a shell and tube heat exchanger as it is in a double pipe heat exchanger. The bottom diagram on the left shows approximately counter flow in a straight tube, one tube pass shell, and tube heat exchanger.

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