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Audit Introduction

AE Industrial & Air Equipment were asked to undertake a compressed air energy audit at ************ Ltd. The purpose of the audit was to identify how the existing compressed air system performs, operates and how well the existing system is matched to the current compressed air demand from the facility. The audit is intended to highlight any potential energy savings that could be realised by optimising the existing system, along with adding or replacing equipment.


The audit was performed using SCADAR™, an advanced, application specific audit system product.  SCADAR™ consists of precision and high frequency data loggers that incorporate high quality sensors to collect and store information relating to a compressed air system’s pressure  and flow rate. In addition, current and voltage loggers enable current, volts, power factor and the true power of each air compressor to be accurately logged.

Purpose of the Audit

The purpose of carrying out a compressed air energy audit is to provide the user visibility of a systems efficiency, performance characteristics and how well matched the system is to the intended application.


An audit can provide vital information to assist the user in making decisions when consideration is being given to the investment of new equipment, either for future expansion or an immediate requirement when a facility has outgrown the compressed air system.

System supply, flow pressure & status

The graph displays the same information as the previous graph but from the supply side of the system.

Also, the compressors status are displayed separately with C1: ML55 and C2: R90n models. The solid green areas are ‘productive power’ (compressor loaded and delivering air). The Yellow areas are ‘non-productive power’ (compressor running off-load: consuming 30 – 40% of the total package kW but not delivering air).

As can be seen from the graph; the R90n VSD compressor is operating continuously, with the 55 kW fixed speed loading when the demand is higher than the maximum output of the 90 kW compressor.