Engineering calculator reviewed for preliminary design use · Last updated: March 2026
Calculate compressor shaft power based on adiabatic compression theory. Compute theoretical power from inlet/outlet pressure, gas flow rate, temperature, and heat capacity ratio k. Apply to compressor selection and motor sizing.
Gas Compressor Adiabatic Power
The theoretical power required to compress a gas is calculated assuming an adiabatic (isentropic) process. Actual shaft power is the adiabatic power divided by the isentropic efficiency.
What efficiency should I use for preliminary sizing?
For centrifugal compressors, use 70-80% isentropic efficiency. For reciprocating compressors, 80-90%. For screw compressors, 60-75%. Actual efficiency depends on the specific machine and operating point.
Does this account for intercooling?
This calculates single-stage adiabatic power. For multi-stage compression with intercooling, calculate each stage separately and sum the power. Intercooling reduces total power and discharge temperature.
These results are preliminary estimates for screening-level design use. They do not replace detailed engineering, code compliance verification, or vendor-certified calculations.