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PF-120 · Verified method

Compressor Condensate Calculator

Calculate condensate formed after compression and aftercooling.

Inputs

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ENGINEERING GUIDE

Use the Compressor Condensate Calculator to calculate condensate formed after compression and aftercooling. The calculator uses Intake reference flow, Ambient temperature, Ambient RH, Ambient absolute pressure and Discharge absolute pressure and reports condensate rate.

How to interpret the result

Read the result in the context of the selected units and pressure basis. For this tool, the primary outputs are condensate rate. Change one input at a time when comparing scenarios so the effect of each variable remains clear.

Formula and methodology

PneumaForge applies this verified method: Calculate intake humidity ratio and dry-air mass flow; after compression/aftercooling use saturation ratio at outlet P,T; condensate=ṁ_dry·max(0,x_in-x_sat,out). The functional engine is shared with related tools in the condensate family, while this page solves the specific intent represented by compressor condensate calculator.

Calculate intake humidity ratio and dry-air mass flow; after compression/aftercooling use saturation ratio at outlet P,T; condensate=ṁ_dry·max(0,x_in-x_sat,out).

Variables and inputs

  • Intake reference flow
  • Ambient temperature
  • Ambient RH
  • Ambient absolute pressure
  • Discharge absolute pressure
  • Aftercooler outlet temperature

Worked example

Reproducible example: start with the calculator's default values (Intake reference flow = 5000; Ambient temperature = 25; Ambient RH = 60; Ambient absolute pressure = 1.01325) and calculate the result. Then change the variable most relevant to your application and compare the new condensate rate against the baseline.

Assumptions and limits

Steady state; separator removes condensed liquid. Use actual ambient RH/T/P.

Engineering tips

  • Use absolute total pressure in psychrometric calculations.
  • Compare moisture on a dry-air mass basis when pressure changes significantly.
  • Use correction factors from the actual dryer manufacturer rather than universal tables.
  • Keep the inputs used for compressor condensate calculator on a consistent engineering basis before comparing alternatives.

Frequently asked questions

What does the Compressor Condensate Calculator calculate?

It is designed to calculate condensate formed after compression and aftercooling. The reported outputs are condensate rate.

What inputs does the Compressor Condensate Calculator use?

The calculator uses Intake reference flow, Ambient temperature, Ambient RH, Ambient absolute pressure and Discharge absolute pressure. Only use values that represent the same operating condition or design case.

What formula or method is used?

The calculation follows: Calculate intake humidity ratio and dry-air mass flow; after compression/aftercooling use saturation ratio at outlet P,T; condensate=ṁ_dry·max(0,x_in-x_sat,out). The page also states the assumptions that define where the method is valid.

Which assumptions can affect the result?

Steady state; separator removes condensed liquid. Use actual ambient RH/T/P.

Can I use different units?

Yes. PneumaForge converts supported units through canonical engineering units. For compressed-air reference flows and pressure bases, the reference pressure and temperature must also remain consistent.