Matched-interval measurement arithmetic
Compressed-Air Electricity Cost per Reference Volume
Use measured electrical energy and delivered reference volume from the same interval and declared system boundary. This page calculates electricity-only arithmetic—not annual projection or total ownership cost.
Interval electricity arithmetic
Matched interval equations
If interval duration t is supplied, average input power is E/t and average reference flow is V/t. These averages do not reconstruct part-load states, peak demand or controls.
System and compressor standards
ISO 11011:2013, confirmed in 2020 and reviewed again in 2026, sets requirements for compressed-air energy-efficiency assessments across supply, transmission and demand, from energy inputs to work performed. ISO 1217:2009 with Amendment 1:2016 covers displacement-compressor acceptance tests for volume flow and power and is under revision.
The CAGI compressor handbook/data-sheet guidance identifies total package input power, rated capacity, operating pressure, inlet conditions and specific power together. Do not divide a shaft/nameplate kW by an unrelated flow value.
Electricity-only result: this excludes capacity/demand charges unless embedded in the entered aggregate price, maintenance, capital, installation, cooling/treatment, pressure-drop and purge/leak losses outside the declared boundary, downtime and opportunity cost. It also makes no generic claim about percentage savings or relative efficiency.
Nikolai Shelkovenko
Nikolai Shelkovenko is a vibration analysis engineer and the founder and CEO of Vibromera. For more than 15 years he has balanced rotating equipment in the field rather than on a test bench: mulchers, industrial fans, crushers, centrifuges, shafts and spindles. That work is what the Balanset instruments grew out of — they were designed as a tool a specialist can carry to the machine and use alone, on site, not as laboratory equipment. Vibromera was founded in 2017 and has been based in Porto, Portugal, since 2023. Development, assembly and support of the Balanset line all happen here. The flagship instrument is the Balanset-1A, a portable analyser for single- and two-plane balancing and for vibration diagnostics. Nikolai is personally involved in customer support, in working through difficult balancing cases and in the development of the software. He works with customers worldwide, in any language.
