Calculate key parameters for centrifugal, reciprocating, axial, and screw compressors
Adiabatic Head
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kJ/kg
Polytropic Head
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kJ/kg
Power Requirement
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kW
-
-
°C
-
%
-
%
| Stage | Pressure Out (kPa) | Temp Out (°C) | Head (kJ/kg) | Power (kW) |
|---|
Polytropic efficiency accounts for heat transfer during compression and is typically 70-85% for centrifugal compressors.
Adiabatic head is the work required to compress gas isentropically, calculated using gas properties and pressure ratio.
Power required depends on mass flow, head, and efficiency, with additional mechanical losses and safety margins.
ηp = [ln(P2/P1)] / [ln(T2/T1)] × (γ-1)/γ where γ is the ratio of specific heats (Cp/Cv).
Had = ZavgRT1(γ/(γ-1))[(P2/P1)(γ-1)/γ - 1] where Zavg is average compressibility, R is gas constant, and T1 is inlet temperature.
P = (ṁ × H) / (η × 1000) where ṁ is mass flow, H is head, and η is efficiency. For multi-stage compressors, power is summed across all stages plus mechanical losses.