Cooling Tower Performance Test — online
Tower capability from a field test by the performance-curve method, with cell-by-cell results and screening diagnostics.
Yellow cells are inputs; orange cells are choices; blue cells choose the unit. Select or hover over an input to see its help in the box below the toolbar. The sheet is the same as the Excel tool (USD 49) — the Guide, method and references are in the Excel file.
What this cooling tower performance test calculator does
Find out how much of its design duty your tower really delivers — and which cell is letting you down. Tower capability from a field test by the performance-curve method, with cell-by-cell results and screening diagnostics.
- Capability by the performance-curve method. Aligned with the publicly documented CTI ATC-105 method. Full vendor curve table or three read values.
- Up to 12 cells. Cell-by-cell flow share, range, approach, fan power, motor loading and indicative capability.
- Screening diagnostics. Flags likely recirculation, nozzle choking, fill fouling, air bypass, flooding and fan problems, with what to inspect.
- Test-validity checks. Wet-bulb, range, flow, fan power, pressure, wind and duration against editable test limits.
- Corrections done properly. Fan-power correction, optional air-density correction, pump heat, cable losses and gearbox efficiency — each with its basis stated.
- History and trends. Log every test and trend capability and approach over time; print-ready report.
What you enter
- Test / document no.
- Test type
- Vendor performance curves
- Curve interpolation
- Air flow from fan power
- Fan power reading
- Air-density correction
- Design circulating water flow (whole tower)
- Design hot water temperature
- Design cold water temperature
- Design inlet wet-bulb temperature
- Design inlet dry-bulb temperature (optional)
- Design barometric pressure
- Design fan power is given as
What you get
- Hot water temperature used
- Cold water temperature used
- Cooling range
- Approach (cold water − inlet wet-bulb)
- Effectiveness, range ÷ (range + approach)
- Heat load
- Fan shaft power — average per cell in service
- Fan shaft power — % of design
- Fan shaft power — total
- Air flow per fan (average)
- Air flow — % of design
- Inlet air density, test / design
- Adjusted water flow (to design fan power)
- Predicted water flow from the curves
Related
- Free quick calculator — a simpler free version for a fast estimate.
- Calculation guide — the equations behind this tool, with a worked example.
- Cooling Tower Performance Test Excel tool — USD 49, keep the workbook and its Guide.
- All 40 online tools
Questions
Is the cooling tower performance test calculator free?
You can enter and check all your data free. The full results, findings and printable sheet are unlocked with a 3-run pack (USD 9), a monthly subscription to all 40 online tools (USD 15) or a yearly one (USD 99).
Are the results the same as the Excel tool?
Yes. The online tool runs the formulas of the Cooling Tower Performance Test Excel workbook, checked cell by cell against the Excel file.
Which units can I use?
SI, US customary and British units — choose the unit next to each input.