Compare actual and ideal performance across common devices. Visualize efficiency, work, and power in seconds. Export clean reports for reviews, labs, maintenance, and design.
Turbine
ηt = (h₁ - h₂,actual) / (h₁ - h₂,isentropic)
Compressor
ηc = (h₂,isentropic - h₁) / (h₂,actual - h₁)
Pump
ηp = (h₂,isentropic - h₁) / (h₂,actual - h₁)
Power = ṁ × specific work
This calculator compares real device performance against an ideal reversible reference process. A lower efficiency usually indicates internal irreversibility, friction, leakage, heat transfer, or flow separation.
| Case | Device | h₁ | h₂,actual | h₂,is | Mass Flow | Estimated Efficiency |
|---|---|---|---|---|---|---|
| 1 | Turbine | 1450 | 1020 | 980 | 12.5 | 91.49% |
| 2 | Compressor | 280 | 415 | 392 | 7.8 | 82.96% |
| 3 | Pump | 95 | 121 | 116 | 20.0 | 80.77% |
It measures how closely a real device approaches an ideal reversible process. Higher values generally mean lower internal losses and better thermodynamic performance.
A turbine produces work while a compressor or pump consumes work. The efficiency definition changes so the final ratio remains meaningful and below ideal conditions.
This version uses enthalpy because it works across many fluids and operating ranges. If your process is an ideal gas, temperature-based relations may also be possible.
It depends on equipment type, size, age, and duty point. Many well-performing industrial machines often operate around 70% to 90% or higher.
That usually indicates inconsistent input data, wrong state points, unit mismatch, or swapped actual and isentropic outlet values. Review all thermodynamic properties carefully.
Mass flow does not change the efficiency ratio directly. It is used to estimate power, loss, and yearly cost impact from the specific work values.
Yes. Repeated checks can reveal performance drift, fouling, leakage, or internal wear. Trending the loss term can support maintenance and retrofit decisions.
Yes. It is useful for lab exercises, design comparisons, and quick engineering reviews. It also helps explain the gap between actual and ideal processes.
Important Note: All the Calculators listed in this site are for educational purpose only and we do not guarentee the accuracy of results. Please do consult with other sources as well.