 | | Kaeser’s new ESD rotary screw compressors | |
Space- and Energy Savings |  |
Kaeser’s new ESD series rotary screw compressors combine impressive air delivery and availability with maximum efficiency and compact design. With motor powers of 200 kW and 250 kW respectively, the ESD 352 and ESD 442 cover free air deliveries from 36.5 to 42 m³/min (at 8 bar) and - just like all Kaeser rotary screw compressors - are designed for pressures up to 15 bar. Their exceptional efficiency and performance is the result of Kaeser’s meticulous engineering and design. The new ESD models save energy in four key ways: 1. Operating at low speeds of 1500 rpm, the airend in every unit features refined flow-optimised “Sigma Profile” rotors for superior efficiency - the ESD 442 is equipped with a specifically-developed airend. In combination with additional optimisation measures, such as the minimisation of internal pressure losses, Kaeser’s energy-efficient design has enabled specific power to be reduced by up to 5 % compared with previous models. 2. Kaeser rotary screw airends are powered by IE3 drive motors for maximum performance and reliability. These motors will become obligatory in the EU from 01.01.2015, but users can already enjoy the benefits that these premium efficiency motors have to offer by choosing Kaeser compressors. 3. Kaeser’s highly efficient 1:1 drive design eliminates the transmission losses associated with gear or V-belt driven systems, as the motor directly drives the airend. 4. With 5 pre-programmed control modes, the newly developed PC-based “Sigma Control 2” compressor controller enables compressor performance to be precisely matched to actual air demand thereby allowing additional energy savings. Kaeser’s new Sigma Control 2 controller also offers added advantages: This advanced system provides greater flexibility through its numerous interfaces and innovative plug-in communication modules. Therefore, connection to energy-saving master control systems, computer networks and/or remote diagnostics and monitoring systems, such as Kaeser's Teleservice facility, couldn’t be easier. The large display located on the control panel also simplifies on-site communication with the system, whilst an SD card slot speeds up data-reading and update processes. Furthermore, the addition of an RFID reader ensures service continuity, increases security and significantly raises service quality. The “Sigma Control 2” is also responsible for monitoring of compressors, refrigeration dryers and frequency converters as available. The efficient cooling system in ESD compressors not only enables exceptionally low compressed air discharge temperatures, but also saves energy, as a speed-controlled fan is responsible for fluid cooling. This intelligent system optimises specific power according to ambient conditions and includes a condensate separator with automatic drain monitoring. Therefore, over 95 percent of accumulating condensate can be separated from the air flow. The cooler is located on the rear-side of the unit where a generously sized intake opening is available for the cooling air. This system prevents the cooling air from being pre-warmed and, as a result, optimises the cooling effect. The efficiency and reliability of downstream compressed air treatment equipment is also considerably enhanced. As frequency-controlled compressors have advantages for certain applications, both models are available with speed control via a frequency converter. All of these advantages, coupled with unprecedented efficiency and compact design, make Kaeser’s new ESD rotary screw compressors true standout systems in their class. |
