Doubling the flow rate in the laminar and transitional regions can more than double the heat exchanger performance. Is it worth it for your application?

The graph shows the effects of fluid velocity on performance and erosion on a 0.375" copper tube-fin, liquid-to-air heat exchanger. You can see that in the turbulent region of flow (Reynolds number greater than 4,000) and at volumetric flow rates of less than 2 gallons per minute (gpm), water velocities are within the recommended values of less than 8 ft/sec (2 gpm) for copper tubing.

Given the same diameter tubing, doubling the flow rate in the turbulent region of flow does not result in double the thermal performance. However, doubling the flow rate in the laminar and transitional regions can more than double the heat exchanger performance.

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