Costs and savings

How much does reducing pressure save?

Compare the same air delivery at two pressures. First check the consumer's requirement.

Your inputs

Example data – these are not your operating figures. Adjust them before calculating.

Calculation basis [selection]Select the appropriate option.Current gauge pressure [bar(g)]Absolute pressure = gauge pressure + 1.01325 bar.Target gauge pressure [bar(g)]Absolute pressure = gauge pressure + 1.01325 bar.Minimum consumer pressure [bar(g)]Absolute pressure = gauge pressure + 1.01325 bar.Losses between compressor and consumer [bar]Range 0 to 10 bar.Current average power consumption for the given profile [kW]Range 0 to 1000000 kW.Power consumption at target pressure and the same profile [kW]Range 0 to 1000000 kW.Free air flow [m³/min]Dry air at 1.01325 bar abs and 20 °C, not the volume in the pressurised pipe.Annual operating time [h/year]Range 0 to 8760 h/year.Electricity price excluding VAT [CZK/kWh]Range 0 to 100 CZK/kWh.

Result

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How we calculate

Method: Measured case: ΔE = (Pexisting − Pnew) × hours at the same delivery and profile. Indicative calculation uses the ratio of isothermal compression work ln(p₂/patm) / ln(p₁/patm), with equal efficiency and delivery and absolute pressures.

Assumptions and limitations: The indicative model does not capture control, idle operation, machine efficiency or changes in leakage. There is no fixed saving percentage per bar. Power consumption must represent the same operating profile. Simple annual balance excluding VAT, discounting, financing and price increases. This is not an energy audit under ISO 11011.

Method references

CAGI Compressed Air & Gas Handbook, chapter 4, 2021 – system design, storage and pressure losses.
ISO 1217:2009 + Amd 1:2016: acceptance tests for displacement compressors, delivery and power consumption.

Method version 1.0. Standard references verified in the ISO catalogue; the physical balances are not calculations prescribed by ISO. Before final design, we will verify actual operating and catalogue data.