Plant engineering calculator · Updated 17 September 2026
Compressor Unload Savings Calculator — Loaded/Unloaded Energy & Annual Cost
Estimate annual compressor energy and savings from measured loaded/unloaded power and duty cycle, then compare with an improved unload/control case.
Inputs
Live results
- Current average power 72 kW
- Improved average power 86 kW
- Annual energy difference -84 MWh
- Annual cost difference -8,400
Formula
Pavg=LF·Pload+(1−LF)·Punload; savings=(Pavg1−Pavg2)·hours.
Worked example
A 100 kW compressor at 60% load with 30 kW unloaded power averages 72 kW.
Assumptions and limits
- Use measured kW rather than nameplate where possible.
- Cycling, blowoff and multiple-compressor interactions may change savings.
FAQs
What does this Compressor Unload Savings Calculator calculate?
Estimate annual compressor energy and savings from measured loaded/unloaded power and duty cycle, then compare with an improved unload/control case.
What should I verify before final design?
Verify measured operating data, fluid properties, equipment curves, safety margins and the applicable OEM or engineering standard.
Why are intermediate results shown?
They expose assumptions and make unit, load and operating-condition errors easier to catch.