Flow calculation worksheet
Compare measured differential pressure against equipment design data to estimate water flow.
● READY FOR INPUT
01
Design conditions
Equipment reference
Used if design PSI is not entered.
Water is approximately 1.00.
If both design PSI and design head are provided, design PSI is used as the reference value. For glycol or other fluids, enter the applicable specific gravity.
02
Field measurements
On-site readings
Used to estimate water-side capacity when provided.
Take both pressure readings across the same component and at the specified test points. Confirm gauge zero and pressure units before calculating.
03
Calculated performance
Field estimate
Estimated water flow
—
GALLONS PER MINUTE (GPM)
Differential pressure
—
PSI
Differential head
—
FEET OF FLUID
Design flow ratio
—
PERCENT OF DESIGN
Estimated capacity
—
BTU/HR • WATER APPROX.
Design comparison
Measured ΔP / design ΔP—
Design pressure reference—
Enter design conditions and field readings, then select Calculate Results.
Calculation basis & independent-tool notice: Estimated GPM = design GPM × √(measured ΔP ÷ design ΔP). Differential head = PSI × 2.31 ÷ specific gravity. Approximate water-side capacity = GPM × 500 × ΔT. Results depend on accurate design data, fluid properties, test locations, and operating conditions. Verify against the equipment submittal and applicable manufacturer service documentation. This is an independently created Daikin Applied-inspired utility; it is not an official Daikin Applied application and is not endorsed by Daikin.