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In plate heat exchangers, counter-current flow maintains a consistent temperature difference between the two fluids throughout the heat exchange process, leading to higher efficiency, reduced thermal stresses, and improved overall performance. While parallel flow may have its applications, counter-current flow is the dominant and preferred method for achieving efficient heat exchange.

Parallel Flow

In parallel flow, both fluids enter at the same end and flow throughout the system in parallel. Initially, there is a significant temperature difference due to the coldest water entering at the inlet. However, as both fluids travel through the heat exchanger, the temperature differential diminishes. In a linear flow system like a plate heat exchanger, the maximum temperature change possible is limited to 50% of the initial temperature. Both fluids will reach the outlet at a similar, if not the same, temperature. We call this a logarithmic cooling relationship.

Counter-Current flow

Counter-current flow, on the other hand, reverses the direction of one fluid stream. As the hot fluid enters from one end, it encounters the already-warmed cold fluid coming from the opposite end. While the initial temperature difference is smaller than in parallel flow, that difference  is maintained throughout the cooling process. As the temperature of the hot fluid decreases, it interacts with progressively colder fluid. This results in a maximum cooling/heating theoretical potential of 100% of the initial temperature differential, making counter-current flow more effective for heat exchange.

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