Customer: Sheet metal cutting and fabrication
Reason for audit: Fixed speed compressor, exploring savings
Current compressor: Atlas Copco GA18+ (18.5kw)
Cost of electricity: £0.34 /kWh (average cost)
Results of Audit: Measured potential savings 49% = £9,050/year
Simulated compressor: Atlas Copco GA11VSDs (11kW) IE5
ROI on equipment: 13 Months
How does this GA11VSDs compressor save so much energy and money?
Atlas Copco’s state-of-the-art element in a unique vertical configuration with an ultra-premium efficiency (IE5) ferrite assisted synchronous reluctance motor. This new motor technology equals IE5 efficiency without the need of rare earth materials, making it a completely sustainable solution.
Above is an energy chart (Amps) showing the compressor running condition, running on load, running unloaded (not pumping air), and stopped.
Green is loaded running – efficient use of power.
Orange is unloaded running, not producing air – wasted electricity.
The compressor is a typical fixed speed unit, correctly sized for the air demand and running normally, but we can see from the volume of off-load running, that there is great potential to save with a variable speed drive replacement.
Weekly Flow chart (l/s)
Survey results
