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.
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
Requirements
Only measures that meet the requirements of the Energy Ordinance (SR 730.01; EnV) can be credited. The additional requirements for the technical characteristics and for the implementation of the measure are set out in Table 1.
| Old system | New system | |
|---|---|---|
| Energy efficiency | - | All compressed-air compressors must meet the limit values for specific power according to ISO 1217-2009 as set out in Annex 1. |
| Savings | Flat-rate approach: This approach can only be applied up to a total rated electrical motor power of 30 kW (old system). System approach: The analysis must be carried out over at least 1 representative week, including the weekend. It is important not to alter the actual state during the analysis. The following results of the analysis must be documented: - Compressed-air demand, including profile - Electricity demand - Extrapolation to 1 year The analysis must show the possible optimisation measures of the new compressed-air system as well as the calculation of the annual consumption taking into account a compressor that meets the minimum efficiency required in Annex 1. For savings of more than 20%, these must be justified clearly and in detail. | |
| Operational optimisation | It must be demonstrated that the compressed-air distribution system was optimised before implementation (e.g. standardised measure DL-02a). | |
| Sizing | The total installed rated power of the new system must be less than or equal to the total installed rated power of the old system. In addition, it must be demonstrated that a reduction of the compressed-air production capacity has been examined and implemented as far as possible. | |
| Implementation | The replacement and commissioning of the new system must be carried out by a qualified specialist or company. | |
| Disposal | The consumption-relevant components of the old devices may not continue to be operated within Switzerland. Proper disposal or export must be demonstrable on request. | |
Proof of compliance
Compliance with the requirements must be demonstrated by the following documents. The documents listed in Table 2 are an integral part of the proof of measure implementation.
- 1.In the case of a system approach: the analysis report (PDF format) prepared by a qualified person or company
- 2.Proof (PDF format) of compliance with the limit values according to Table 2 for each compressed-air compressor of the new installation
- 3.Explanation (PDF format, max. 2 A4 pages) of how it is ensured that the replaced devices were properly disposed of (e.g. by means of declarations, disposal items on contractor invoices, etc.).
- 4.Invoice documents (PDF, PNG or JPEG format)
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ContactSymbols, 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%.