Compare energy use for fixed-speed and variable-speed operating profiles.
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Use the Fixed Speed vs VSD Compressor Savings Calculator to compare energy use for fixed-speed and variable-speed operating profiles. The calculator uses Demand bins: hours,fixed_kW,vsd_kW — one per line, Electricity price and VSD extra investment and reports energy/cost savings; payback support.
Read the result in the context of the selected units and pressure basis. For this tool, the primary outputs are energy/cost savings; payback support. Change one input at a time when comparing scenarios so the effect of each variable remains clear.
PneumaForge applies this verified method: Time-weighted energy comparison across demand bins: E_fixed=ΣP_fixed(load_i)·t_i; E_VSD=ΣP_VSD(load_i)·t_i; savings=(E_fixed-E_VSD)·tariff. The functional engine is shared with related tools in the compressor-economics family, while this page solves the specific intent represented by VSD air compressor savings calculator.
Time-weighted energy comparison across demand bins: E_fixed=ΣP_fixed(load_i)·t_i; E_VSD=ΣP_VSD(load_i)·t_i; savings=(E_fixed-E_VSD)·tariff.Reproducible example: start with the calculator's default values (Demand bins: hours,fixed_kW,vsd_kW — one per line = 2000,60,45\n2000,35,25; Electricity price = 0.2; VSD extra investment = 5000) and calculate the result. Then change the variable most relevant to your application and compare the new energy/cost savings; payback support against the baseline.
Power curves/points come from user or CAGI/OEM data; never invent a generic VSD efficiency curve.
It is designed to compare energy use for fixed-speed and variable-speed operating profiles. The reported outputs are energy/cost savings; payback support.
The calculator uses Demand bins: hours,fixed_kW,vsd_kW — one per line, Electricity price and VSD extra investment. Only use values that represent the same operating condition or design case.
The calculation follows: Time-weighted energy comparison across demand bins: E_fixed=ΣP_fixed(load_i)·t_i; E_VSD=ΣP_VSD(load_i)·t_i; savings=(E_fixed-E_VSD)·tariff. The page also states the assumptions that define where the method is valid.
Power curves/points come from user or CAGI/OEM data; never invent a generic VSD efficiency curve.
Yes. PneumaForge converts supported units through canonical engineering units. For compressed-air reference flows and pressure bases, the reference pressure and temperature must also remain consistent.