Chilled Water Piping Friction Head Loss Calculator
Hydronic Systems Engineering: Calculate fluid velocity ($V$), Darcy-Weisbach friction factor ($f$), piping head loss ($\Delta H$), and pump brake horsepower ($BHP$).
Hydronic Flow & Pipe Geometry
Pump & Fluid Properties
Hydraulic Friction & Pumping Power
Flow Velocity ($V$)
-- ft/s
ASHRAE: 4 - 10 ft/s target
Total Head Loss ($\Delta H$)
-- ft H₂O
Pressure Drop: -- psi
Head Loss Rate
-- ft / 100 ft
Darcy f: --
Pump Brake Power ($BHP$)
-- BHP
Electric Power: -- kW
ASHRAE Sizing Criteria:
• Recommended head loss: $1.0$ to $4.0$ ft per 100 ft of pipe run.
• Darcy-Weisbach: $h_f = f \frac{L_{total}}{D} \frac{V^2}{2g}$. Pump power: $BHP = \frac{GPM \cdot Head}{3960 \cdot \eta_{pump}}$.
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