Static, velocity, total pressure and input kW for a marine ventilation / engine-room-supply fan.
Formula
$$ P = \frac{Q \cdot \Delta p_\text{total}}{\eta}, \quad \Delta p_\text{total} = \Delta p_\text{static} + \tfrac{1}{2}\rho V^2 $$
Symbol legend
| Symbol | Meaning | Unit | Source |
|---|---|---|---|
| $Q$ | Flow | m³/h (÷3600 for m³/s) | fan rating |
| $\Delta p_\text{static}$ | Static pressure rise | Pa | system curve |
| $V$ | Discharge velocity | m/s | area / Q |
| $ρ$ | Air density at condition | kg/m³ | 1.2 at 20 °C standard |
Sources
- AMCA 210 - Fan testing.