Evaporation, drift, blowdown, makeup and water cost for open recirculating towers — three cases side by side.
USD 29
| Format | Excel workbook (.xlsx), no macros |
| Version | v1.3 |
| 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
Complete water balance
Evaporation, drift, blowdown and makeup, plus heat load, approach and effectiveness.
Cycles three ways
Enter cycles directly, work them out from a water analysis (conductivity, chloride, silica, hardness or TDS), or from measured blowdown.
Your choice of method
Evaporation factor from Perry, Marley or GPSA/Branan, or your own; blowdown with or without drift credited.
Annual cost and savings
Water and blowdown treatment cost per year, and a what-if table for higher cycles.
Field check
Compare the calculation with a site test using makeup, blowdown and basin level — find unaccounted losses and your tower's real evaporation factor.
Three cases side by side
Design, actual and proposed, in any mix of SI, US and British units.
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.