Energy-saving features for new compressors

The flow-optimised SIGMA Profile rotary screw airends are controlled by a PC-based SIGMA Control 2 compressor controller which precisely adjusts air delivery to suit demand.

An electronic thermal management (ETM) system for the cooling fluid makes its debut in these two compressor ranges. Based on input from a sensor, the SIGMA Control 2 controller directly controls a servo motor that drives a temperature control valve integrated into the cooling fluid circuit. This allows efficient control of the compressor discharge temperature and enables the heat recovery system to be optimised to match the user’s needs.

Developed by HPC Kaeser, the ETM also allows cooler intake air to be used, saving energy and preventing over-temperature at the discharge side. The active control slows down the heating of the components and reduces thermal stress on the compressor airend and cooler, which in turn extends component and cooling fluid service life.

HPC Kaeser uses IE4 'Super Premium Efficiency' motors in the BSD series. These are said to be even more efficient than 'Premium Efficiency' IE3 motors, which the company has been using for its screw compressors for some time. They continue to be used in the new ASD series packages.