Fixed-speed or variable-speed air compressor?
Compare both configurations against measured air demand and operating hours rather than a universal savings claim.
| Decision | Fixed speed | Variable speed (VSD/VFD) |
|---|---|---|
| Demand pattern to examine | Steady demand and the proposed control arrangement. | Changing demand and the model’s usable operating range. |
| Capacity comparison | Delivered airflow at the required pressure. | Delivered airflow at the same pressure across the required range. |
| Cost comparison | Purchase, measured operating energy and maintenance. | Purchase, measured operating energy and maintenance. |
| Decision evidence | Demand profile and site assessment. | Demand profile and site assessment. |
Measure the operating pattern
Record when production starts, when individual machines run and how demand changes during breaks and shifts. Use that profile to ask for a comparison at your required pressure and air quality.
Evaluate the system together
Include the existing receiver, dryer, filtration and distribution layout in the assessment. Request a documented operating-cost estimate with its assumptions. The catalog does not establish a guaranteed energy-saving percentage for your workshop.