免费压缩机功率计算器
计算气体压缩机的理论功率和实际功率。
Actual Shaft Power
183.16 kW
Actual Shaft Power vs Mass Flow Rate (m)
公式
## Adiabatic Compressor Power The isentropic (ideal adiabatic) compression process provides the theoretical minimum power needed. Real compressors require more power due to irreversibilities. ### Formula **W_ideal = m × Cp × T1 × (PR^((gamma-1)/gamma) - 1)** **W_actual = W_ideal / eta_isentropic** **T2 = T1 × (1 + (PR^((gamma-1)/gamma) - 1) / eta)** where PR is the pressure ratio, gamma is the specific heat ratio, and eta is the isentropic efficiency.
计算示例
Compressing 1 kg/s of air from 300 K with pressure ratio 4, gamma=1.4, eta=80%.
- 01(gamma-1)/gamma = 0.4/1.4 = 0.2857
- 02PR^0.2857 = 4^0.2857 = 1.486
- 03Ideal power = 1 × 1.005 × 300 × (1.486 - 1) = 301.5 × 0.486 = 146.5 kW
- 04Actual power = 146.5 / 0.80 = 183.2 kW
- 05T2 = 300 × (1 + 0.486/0.80) = 300 × 1.608 = 482.3 K
常见问题
What is typical isentropic efficiency?
Centrifugal compressors: 75-85%, axial compressors: 85-92%, reciprocating compressors: 70-85%, screw compressors: 70-80%. Larger, more advanced machines tend toward the higher end.
Why is discharge temperature important?
High discharge temperatures can damage seals and lubricants, cause thermal expansion issues, and limit the pressure ratio per stage. Air compressors are often limited to about 200°C discharge, requiring intercooling for high pressure ratios.
When is multi-stage compression needed?
For pressure ratios above about 3-4 per stage (depending on gas and machine type), intercooling between stages reduces power consumption and limits discharge temperature. The ideal approach uses equal pressure ratios per stage.
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