Tower capability from a field test by the performance-curve method, with cell-by-cell results and screening diagnostics.
USD 49
| Format | Excel workbook (.xlsx), no macros |
| Version | v1.2 |
| Works in | Excel 2010 or later, Windows and Mac |
| Units | SI, US and British, mixed freely |
| Includes | Guide tab with method and references, calculator, print-ready report |
| Free version | Try the online calculator |
Single-user licence. Team and site licences: see options. Instant download after payment; you also get updates to this major version.
What it does
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.
Built for engineers
- Visible formulas — nothing hidden, so you can check every step.
- Fully referenced — methods from the standard references, checked against their published worked examples.
- Safe to share — sheets are protected against accidental edits, with an open password so you can still customise.
- Built-in input checks — clear warnings for impossible inputs and values outside typical ranges.
For engineering estimates; verify against site data. Code-based methods are aligned with the publicly documented procedure; they are not a licensed reproduction or a certification.