What is the advantage of a counterflow arrangement in heat exchangers?

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The main idea is that heat transfer is driven by the temperature difference between the hot and cold streams. In a counterflow heat exchanger, the two streams move in opposite directions, so the hottest part of one stream faces the coldest part of the other. This keeps the temperature difference large along most of the length, which means a higher average driving force for heat transfer. As a result, more heat can be transferred for the same area or you can achieve closer outlet temperatures with the same arrangement. Other statements aren’t inherent advantages of counterflow: noise levels, insulation needs, and zero pressure drop aren’t guaranteed benefits of this flow setup and aren’t the primary reason counterflow is favored.