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Compressor Sizing Calculator
Polytropic and isentropic compression power calculation with gas properties, discharge temperatures, and shaft power for centrifugal and reciprocating compressors
Gas
Operating Conditions
Efficiencies
Results
Gas
Air
Gas Constant R
287.1000J/kg·K
Specific Heat cₚ
1,005J/kg·K
Ratio γ = cₚ/cᵥ
1.400
Inlet Density
1.1834kg/m³
Volumetric Flow
1,000m³/h
Mass Flow
0.328730kg/s
Pressure Ratio
4.94
Poly. Exponent n
1.556
Polytropic Eff.
80.0%
Discharge Temperature
Isentropic T₂
197.3°C
Polytropic T₂
254.2°C
Actual T₂
240.4°C
T₂ Rise ΔT
215.4°C
Power
Isentropic Power
56.9320kW
Polytropic Power
60.5569kW
Shaft Power
62.4298kW
Mech. Eff.
97.0%
Polytropic Eff: Good (80%)
Discharge T: High (240°C) — consider intercooling
Pressure Ratio: Multi-stage required (4.9)
Centrifugal Compressors
- Continuous flow, high capacity
- Typical polytropic efficiency: 70–85%
- Best for steady, large volume applications
- Multiple stages for high compression ratios
Reciprocating Compressors
- Positive displacement, high pressure
- Typical polytropic efficiency: 75–90%
- Best for high pressure, lower volume
- Intercooling between stages