Replacement of Compressed Air Compressors up to 250 kW
Compressed Air
Measure Goal
The goal of this document is to estimate the electricity savings triggered by the replacement of compressed air compressors up to 250 kW on a flat-rate basis.
Symbols, Terms and Units
| Symbol | Description | Unit |
|---|---|---|
E | annual electricity consumption | kWh/a |
ΔEeco | cumulative electricity savings | kWh |
Ė | electrical rated power (motor) | kW |
Ns | standard effective duration | a |
f | factor | — |
t | full load hours | h/a |
Calculation Formulas
Creditable Savings
The creditable electricity savings of the measure is the difference between the current and the new annual electricity consumption, cumulated over the standard effective duration. To account for the natural renewal and optimization rate, the creditable electricity savings are reduced by a reduction factor f_eco of 0.75.
Annual Electricity Consumption (Flat-rate Approach)
For small capacities, the flat-rate approach can be applied. The new electricity consumption is calculated with a savings factor f_eff of 10%. The flat-rate approach is limited to compressed air compressors up to a maximum of 30 kW.
Annual Electricity Consumption (System Approach)
A compressed air analysis should always be preferred because the savings are usually greater. The analysis should be carried out over at least 1 week, including weekends. The savings factor is limited to a maximum of 50%.
Examples and Scenarios
Single compressor replacement (flat-rate approach): A 30 kW compressed air compressor is replaced without analysis and electricity consumption is estimated using the table (2-shift operation, 150,000 kWh/a).
Inputs
30 kW, 2-shift operation, 10% factor
System replacement (3 compressors to 2) with analysis: A system with 3 compressed air compressors is replaced, with the new state containing only 2 compressed air compressors. Annual savings are calculated with a compressed air analysis and amount to 14% (980,000 kWh/a old consumption).
Inputs
Multi-compressor system, 14% factor
Downloads
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