Which heat exchanger performs better?

Same fluids. Same inlet conditions. Different flow arrangement.
In a parallel-flow heat exchanger, both fluids move in the same direction, causing the temperature difference between them to decrease rapidly along the exchanger.
In a counter-flow heat exchanger, the fluids move in opposite directions, maintaining a larger temperature difference over the length of the exchanger.
The result:
• Higher average temperature driving force
• More effective heat transfer
• Higher heat exchanger effectiveness
Counter-flow wins. But the reason is the temperature difference.

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