Rotary screw compressors

Kaeser Compressors has announced the launch of its latest generation DSD series rotary screw compressors.

At the heart of every DSD.3 series compressor is a rotary screw compressor block equipped with the flow-optimised and energy-saving ‘Sigma Profile’ rotors. In the next generation models, the profile rotors have been further refined. Together with additional optimisation measures, the rotors boast up to six per cent better power performance compared with previous models. They also include a ‘super premium efficiency’ IE4 electric motor that complies with and exceeds prevailing Australian GEMS regulations for 3 phase electric motors, whilst also contributing to lower energy costs. Transmission losses associated with gear or belt drive solutions are also further eliminated with these 1:1 direct drive systems.

All models feature a built-in Sigma Control 2 industrial PC-based compressor controller that is responsible for dynamically adjusting the flow rate to match actual compressed air demand, thereby enabling further energy savings. RFID technology further ensures secure login, meaning that service work and system changes to the compressor can only be performed by authorised personnel.

Furthermore, the compressors are available with heat recovery. All models can be optionally equipped with an integrated fluid/water plate-type exchanger and an additional fluid-thermal valve. The Sigma Control 2 controls the compressor temperature to ensure that hot process water supplied by the heat recovery system attains the desired water outlet temperature. In addition, if all of the heat energy is drawn off by the heat recovery system, the Control 2 detects that cooling is no longer required at the package cooler and the fan on the oil cooler is shut down. This saves fan power at the oil cooler, thereby reducing energy costs. In addition, if heat recovery is not required, it can simply be deactivated via the Control 2. This has the advantage that the package reverts to operation with the lowest possible screw compressor block discharge temperature – creating further energy savings.

The compressors are available air- or water-cooled, with drive power 75 to 132kW, working pressure 5.5 to 15bar and free air deliveries from 3.6 to 25.45m3 /min. They are available as a standard machine, with integrated refrigeration dryer and/or with Sigma Frequency Control.