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ESP=ΔPstraight+ΔPfittings+ΔPaccessoriesESP equals cap delta cap P sub straight end-sub plus cap delta cap P sub fittings end-sub plus cap delta cap P sub accessories end-sub ΔPstraightcap delta cap P sub straight end-sub = Linear friction losses in straight duct sections. ΔPfittingscap delta cap P sub fittings end-sub
Where:
Use friction chart or: $$\Delta P_f = 0.109136 \times (Q^1.9) / (D_e^5.02)$$ Where:
External Static Pressure represents the cumulative pressure drops across all components located outside the air-handling unit casing. By principles of fluid dynamics and ASHRAE fundamentals , ESP is calculated along the (the aerodynamically longest run, which yields the maximum pressure drop):
(with 10% safety margin → 1.1 in. w.g.)
Common fittings include:
$$ \textTotal ESP = \textSupply Loss (0.36) + \textReturn Loss (0.20 est.) + \textSafety Factor $$
ESP=ΔPstraight+ΔPfittings+ΔPaccessoriesESP equals cap delta cap P sub straight end-sub plus cap delta cap P sub fittings end-sub plus cap delta cap P sub accessories end-sub ΔPstraightcap delta cap P sub straight end-sub = Linear friction losses in straight duct sections. ΔPfittingscap delta cap P sub fittings end-sub
Where:
Use friction chart or: $$\Delta P_f = 0.109136 \times (Q^1.9) / (D_e^5.02)$$ Where:
External Static Pressure represents the cumulative pressure drops across all components located outside the air-handling unit casing. By principles of fluid dynamics and ASHRAE fundamentals , ESP is calculated along the (the aerodynamically longest run, which yields the maximum pressure drop):
(with 10% safety margin → 1.1 in. w.g.)
Common fittings include:
$$ \textTotal ESP = \textSupply Loss (0.36) + \textReturn Loss (0.20 est.) + \textSafety Factor $$