Friction loss is usually expressed as pressure drop per unit length (e.g., YouTube·PASSIONATE ENGINEER
External Static Pressure. It sounded so clinical, but to Arthur, it was the difference between a building that breathed and one that choked. If he underestimated the resistance of the supply ducts or forgot to account for the pressure drop across the new high-efficiency filters, the massive air handling unit on the roof would be nothing more than an expensive, oversized paperweight. esp calculation hvac excel sheet
| Component | Typical Pressure Drop (in. w.g.) | | :--- | :--- | | Flexible duct (per 100 ft) | 0.10 – 0.50 | | Rigid metal duct (per 100 ft) | 0.05 – 0.20 | | 90° Elbow | 0.03 – 0.10 | | Supply diffuser | 0.05 – 0.15 | | Return grille | 0.03 – 0.10 | | MERV 8 Filter | 0.10 – 0.25 | | Cooling/Heating coil | 0.20 – 0.60 | Friction loss is usually expressed as pressure drop
Where the pressure loss ($\Delta P$) for any component is calculated as: $$\Delta P = C \times P_v$$ | Component | Typical Pressure Drop (in
Note : Exceeding the manufacturer’s rated ESP (often found on the unit’s nameplate) leads to motor burnout and inefficient operation.
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