How efficient is the station today? The report compares annual electricity, air volume and operating hours to form the current station performance frame.
Compressed air diagnosis
Compressed air energy savings calculator and diagnosis report
kWhScan helps plant teams and energy consultants screen compressed air savings from pressure, controls, equipment selection, leakage, dryer purge, distribution loss and heat recovery. Start with field-readable data, then add trend data when it improves the diagnosis.
- Estimate savings from pressure reduction, unload loss, low-load operation, centrifugal blow-off, dryer purge, leakage and recoverable waste heat.
- Separate the saving owner for each measure before totals are shown, so pressure, leakage and control improvements are not double counted.
- Use the free result as a pre-audit screen, then unlock the detailed engineering report only when the result is useful.
Why it matters
A compressed air saving estimate is only useful when it shows who owns the saving.
Compressed air systems waste energy in several connected ways. A high pressure setpoint can increase compressor power, leakage and unregulated end-use demand at the same time. Poor sequencing can create unloaded running, low-load operation or centrifugal blow-off. A dryer or filter can add pressure drop or purge air loss. A leak repair program may overlap with pressure reduction because both affect the same compressed air baseline.
This is why a single leakage calculator or pressure reduction formula is not enough for a report-ready diagnosis. The calculation must show which part of the system owns each saving and which measures overlap before the total saving is presented.
Diagnosis structure
Five checks behind the compressed air diagnosis
kWhScan follows the same structure used in an engineering diagnosis report: baseline, equipment, control, distribution and multi-energy boundary. Each module answers a different customer question.
Are the machines and pressure class matched to demand? The diagnosis checks capacity mix, rated pressure, rated flow, rated power and unit efficiency signals.
Is energy wasted through pressure, sequencing, unload, low-load or blow-off? Controller readings and trend data can improve this module.
Is air lost through pressure drop, dryer purge, drainage, leakage or inappropriate demand? These items are separated from compressor-side savings.
Can compressor waste heat offset hot water, space heating, process heat or boiler fuel? The report keeps heat recovery separate from compressed air electricity savings.
Unlock the detailed report when the free result shows a meaningful saving signal and the calculation basis is worth saving.
Data path
Start with site-readable values, then import trends when available.
The first diagnosis should not require a perfect instrumented system. Users can start with values that are usually available from energy bills, meters, compressor nameplates, controller screens and operator records. Trend data improves confidence, but it should refine the report rather than block the first result.
- Annual compressor station electricity or meter baseline.
- Annual air volume or average air flow.
- Operating hours and electricity price.
- Minimum end-use pressure, average supply pressure and pressure band.
- Compressor type, rated power, rated flow and rated pressure.
- Controller readings such as run hours, load hours, average load ratio, IGV position or BOV/blow-off information.
- Dryer type, purge ratio if known, pressure drop, leakage test or night baseline if available.
- Cooling method and useful heat demand for heat recovery.
- Timestamp, total station power, main air flow and header pressure.
- Aftertreatment inlet and outlet pressure if available.
- Critical end-use pressure if available.
- Equipment status, load state or controller counters if available.
Pressure and control
Pressure and control savings must be calculated together.
Reducing pressure can reduce compressor energy, but it can also reduce leakage and unregulated air demand. If these effects are calculated separately without an overlap rule, the final saving can be overstated.
Control loss is equipment-specific. Fixed-speed screw compressors may waste energy through unloaded running. VFD compressors may operate inefficiently at very low load. Centrifugal compressors may waste energy through blow-off or operation near the surge boundary. A mixed fleet may waste energy when the wrong machine carries the wrong load.
Equipment selection
Equipment selection is more than installed horsepower.
A compressed air station can have enough installed capacity and still be inefficient. The machines may be oversized for demand variation, rated for a higher pressure than the site needs, inefficient compared with current performance references, or poorly matched to the load profile.
For screw compressors, the diagnosis may flag low-efficiency units, pressure-class mismatch or replacement candidates. For centrifugal compressors, the diagnosis may flag impeller, stage, turndown or blow-off related opportunities. Final equipment selection still needs supplier validation, but the pre-audit report can show whether the current fleet deserves deeper review.
Distribution and end-use
Air loss belongs to the distribution and end-use side.
Leakage can be a major compressed air loss, but it should not be treated as an isolated number. Leak reduction, pressure reduction and end-use demand management can affect the same baseline. Dryer purge, drain leakage, filter pressure drop and aftertreatment pressure drop also need clear ownership so they are not counted again under equipment selection or station control.
Dryer diagnosis depends on the dryer type and air-quality requirement. A desiccant dryer with purge air loss should be evaluated differently from a refrigerated dryer. The report states the target basis and whether the result is measured, manufacturer-based or an engineering estimate.
Heat recovery
Heat recovery is valuable, but it is not compressed air electricity saving.
Most compressor input energy becomes heat. If the site has useful hot water, space heating, process heat or boiler make-up demand, compressor heat recovery may reduce another energy bill. This value should be reported, but it should be kept separate from the compressed air electricity saving rate unless the measure directly changes compressor electricity.
The diagnosis checks compressor cooling method, heat demand type, required temperature, operating hours, distance and usable heat demand. It also states the cross-energy boundary so the same benefit is not counted twice in the integrated energy report.
Report unlock
Free compressed air screening first. Detailed report when useful.
The free diagnosis is intended to answer whether the compressed air station has a meaningful saving signal. It shows the baseline, approximate opportunity direction and top findings. The paid unlock adds the full compressed air engineering report.
- Compressed air baseline and saving signal.
- Top findings across pressure, control, equipment, leakage and heat recovery.
- Project-level view of whether detailed diagnosis is worth continuing.
- Full compressed air diagnosis report.
- Measure-by-measure calculation basis.
- Five-module contribution table.
- Evidence labels and overlap notes.
- Implementation and measurement recommendations.
- Download access.
FAQ
Common questions
Is this only a leakage calculator?
No. Leakage is only one module. The diagnosis also checks pressure, control, equipment selection, dryer purge, distribution loss and heat recovery.
Do I need a flow meter?
No. You can start with annual air volume or average flow if available. If neither is available, the result becomes less precise and the report states the data basis.
Can I use controller readings instead of a full trend export?
Yes. Run hours, load hours, average load ratio, IGV position or BOV/blow-off information can support useful control-loss diagnosis before a full time-series export is available.
Can the tool recommend compressor replacement?
It can flag replacement or retrofit opportunities when rated pressure, capacity, specific power or operating pattern indicates a mismatch. Final equipment selection still needs supplier validation and site constraints.
How does the report avoid double counting?
Measures that affect the same baseline, such as pressure reduction, leakage reduction and control optimization, are grouped before totals are shown. The report states which item owns each saving.
Run the free compressed air diagnosis.
Use it as a pre-audit screen before spending time on detailed site measurement.