Polytropic Head β’ Discharge Temperature β’ Stages β’ Power β’ Z-effect β’ Anti-surge (Screening)
Scope: Polytropic compression screening for centrifugal/axial style estimation.
Anti-surge is an approximate control-line estimate; real surge line must come from OEM map.
Suction / Discharge Conditions
Gas Properties
Performance Assumptions
Flow
Staging Limits (Design Rules)
Anti-surge (Screening)
Compression Results
Overall Pressure Ratio, PR:-
Polytropic Exponent used, n:-
Avg Compressibility, Zavg:-
Polytropic Head, Hp:-
Discharge Temperature, T2:-
Staging Estimate
Stages Required (by PR & T2):-
Estimated Stage PR:-
Estimated T2 per Stage:-
Power
Gas Power (shaft), Pgas:-
Driver Power, Pdriver:-
Anti-surge (Screening)
Estimated Surge Control Flow:-
Recommended Min Operating Flow:-
Polytropic head (per kg): Hp = (n/(n-1)) Β· (ZavgΒ·RspecΒ·T1) Β· (PR^((n-1)/n) β 1) / Ξ·p
Rspec = Ru/MW (J/kgΒ·K). Zavg = (Z1+Z2)/2. T2 = T1 Β· PR^((n-1)/n) (screening)
Power: Pgas = αΉ(kg/s) Β· Hp (J/kg). Driver power = Pgas/(Ξ·mΒ·Ξ·d)
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