When you look at the total invoice in industrial facilities, there are three major consumers hidden under the “process” or “production line” item: electric motors, air conditioning (HVAC) and compressed air systems. In the literature, it is stated that engines consume 60-70% of industrial electricity; It is frequently emphasized that compressed air errors turn 20-40% of the total compressor energy into loss. The main OSOS counter does not parse these — the sub-counter is essential.
60–70%
Engine share
Industrial electrical literature
20–40%
Compressed air leak
Compressor energy loss
10–30%
VFD saving
Depends on load profile
kWh/m³
EnPI example
Compressed air specific energy
Electric motors: why are they dominant?
Asynchronous motors operate continuously or cyclically in pumps, fans, conveyors, compressors and production lines. Low load factor, wrong motor selection, belt slippage and outdated efficiency class (IE1/IE2) produce unnecessary kWh. Engine efficiency is not just “buy a bigger engine”; It is a combination of right sizing, soft start and variable speed (VFD).
HVAC: cost of comfort
Chiller, air handling unit, fan coil and ventilation systems create demand peaks, especially in summer months. In our Contract Power and Peak Load guide, the demand contribution of HVAC during peak hours is highlighted. Set temperature optimization, free cooling, maintenance (filter, coil) and BMS integration provide rapid gains.
Compressed air: invisible leak
- Leak detection: ultrasonic measurement, pressure drop test
- Idle compressor (idling) — control strategy
- Pressure band optimization (unnecessarily high bar)
- Heat recovery (dryer, process heat)
- Specific energy: kWh/m³ compressed air — monthly KPI
| System | EnPI | good practice | improvement area |
|---|---|---|---|
| Production line engines | kWh/ton | The trend is stable | VFD + maintenance |
| compressed air | kWh/m³ | < 0.10 kWh/m³ | Leak + pressure |
| HVAC (building) | kWh/m² | Season normalized | Setpoint + BMS |
| chiller | kWh/ton of cooling | COP monitoring | Condenser cleaning |
VFD, maintenance and efficiency
Variable frequency drive (VFD) dramatically reduces fan/pump consumption at part load; However, harmonic and engine compatibility should be checked. The maintenance–efficiency relationship is clear: belt tension, bearing, filter clogging and compressor oil directly create kWh increases. In the ISO 50001 Significant Energy Uses (SEC) list, engine, HVAC and compressed air station should be on separate lines.
Regional monitoring with submeter
As described in our guide to Energy Use Measurement in Industry, the sub-meter makes consumption visible behind the main OSOS meter. Separate counter for compressor room, cooling center and main line motor board; Night shift base load analysis and anomaly alarm are possible. ENOPTIMAL consumption module offers line-based ranking in multi-meter facilities.
Conclusion
Operational efficiency projects can save 10–25% without requiring major investment — measure first, prioritize VFD/leak/maintenance later. With the demo, you can create an engine-HVAC-compressed air consumption map specific to your facility.