How to Select an AHU Cooling Coil: Rows, Fins and Face Velocity
Updated: 3 days ago
The cooling coil is one of the most important components in an air-handling unit. It determines whether the AHU can deliver the required:
Sensible cooling capacity
Moisture removal
Supply-air temperature
Indoor humidity control
Chilled-water temperature difference
Fan energy performance
Selecting a coil based only on total cooling capacity can lead to poor results. Two coils rated for the same capacity may have very different face velocities, row depths, fin densities, air-pressure drops, water-pressure drops and dehumidification performance.
A proper selection must balance five major factors:
Cooling capacity
Number of coil rows
Fin density
Coil face velocity
Airside and waterside pressure drop
This article explains how these factors interact and provides a practical method for selecting chilled-water AHU cooling coils. (How to Select an AHU Cooling Coil: Rows Fins and Face Velocity)
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Sizing equipment on a live project? The Cooling Load Design Handbook walks through the full design chain - envelope and internal loads, latent load, airflow, coil duty and equipment selection - with worked examples.
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