Engineering referenceIndustrial Compressed Air Assessment
Assess compressor energy, leakage, unloaded operation, pressure performance, treatment losses, heat recovery and prioritized optimization.
Calculation method
Each compressor is modeled from available power, capacity and operating-state hours. Pressure, leakage, receiver, dryer and network inputs activate deeper analyses; every estimate retains its method and evidence level. Combined savings are constrained to reduce overlap.
Formulas used
Annual energy = Σ(state power × state hours)Specific energy = compressor energy / delivered normal volumeLeakage cost = estimated leakage energy × electricity tariff
Worked example
A 75 kW unit loaded for 4,000 h and drawing an entered 30% of rated power for 1,000 unloaded hours uses 322.5 MWh/year before auxiliary treatment loads.
How to interpret the result
Separate measured quantities from inferred leakage or control losses. First actions should target the largest supported cost with acceptable confidence, not a generic equipment replacement.
Common mistakes
- Treating rated motor power as measured power in every state.
- Estimating leakage from a percentage without labeling it.
- Adding pressure, leakage and sequencing savings without overlap control.
Scope and limitations
- Simplified network and receiver checks do not replace pressure/flow logging, ultrasonic leak survey or a full pneumatic-network study.
Frequently asked questions
Can leakage be calculated without a flow meter?
It can be estimated from off-production cycling or an explicit leakage percentage, but it is labeled estimated.
Does reducing pressure always save energy?
Only when process minimum pressure and network drop leave a safe margin; the assumption used must remain visible.
Is VSD always recommended for fixed-speed compressors?
No. Variable demand, unloaded operation and sequencing evidence must justify the study.
Can recovered heat be counted as electrical savings?
No. It is a separate thermal-energy potential valued only against the displaced thermal source.