Formula & worked example
w=0.62198Pv/(P−Pv); condensate=ṁdry-air·(win−wout).
Warm humid intake air compressed and cooled can shed many litres of condensate per day even when free-air flow looks modest.
Plant engineering calculator · Updated Sep 17, 2026
Compressed Air Moisture Calculator — Condensate Load & Dryer Duty
Estimate water entering with compressor intake air and condensate removed after cooling from ambient temperature/RH, free-air delivery, pressure and aftercooler temperature. Returns inlet moisture, retained moisture and condensate per hour/day.
Inputs
Live result
Intake humidity ratio 18.79211 g/kg dry air
Aftercooler saturation ratio 4.39831 g/kg dry air
Dry-air mass flow 1,356.299 kg/h
Estimated condensate 19.5223 kg/h ≈ L/h
Estimated condensate 468.5353 L/day
Assumptions & limits
- Uses saturation-vapor-pressure correlations and steady ideal-gas screening.
- Drain sizing and dryer selection need actual site peaks, pressure dew point and manufacturer ratings.
Frequently asked questions
What does this Compressed Air Moisture Calculator calculate?
Estimate water entering with compressor intake air and condensate removed after cooling from ambient temperature/RH, free-air delivery, pressure and aftercooler temperature. Returns inlet moisture, retained moisture and condensate per hour/day.
Can I use the result for final equipment selection?
Use it for screening, benchmarking and option comparison. Final selection should use measured conditions, manufacturer performance data and applicable engineering standards.
Why are assumptions shown beside the calculation?
Plant calculations change materially with pressure basis, reference conditions, efficiencies and operating profile. Explicit assumptions make the result auditable instead of hiding those choices.