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09:30 ics Saal 4
Pneumatic or electromechanical drives - a comparison regarding their exergy efficiency
Stephan Merkelbach, RWTH Aachen University, Institute for Fluid Power Drives and Controls (IFAS), Germany
Hubertus Murrenhoff, RWTH Aachen University, Institute for Fluid Power Drives and Controls (IFAS)
Christian Brecher, RWTH Aachen University, Laboratory for Machine Tools and Production Engineering (WZL)
Marcel Fey, RWTH Aachen University, Laboratory for Machine Tools and Production Engineering (WZL)
Bastian Eßer, RWTH Aachen University, Laboratory for Machine Tools and Production Engineering (WZL)
Pneumatic linear drives are widely used in manufacturing, mainly for handling tasks. Due to rising interest in environmental matters and increasing energy costs, energy efficiency has become a major issue in industrial applications. There is a growing competition between pneumatic and electromechanical drives. Pneumatic drives are said to have a lower efficiency while the initial costs of electromechanical drives are higher. The operating costs of electromechanical as well as pneumatic drives are induced by their exergy efficiency. The efficiency of the drives depends on parameters like cycle time, load applied to the cylinder and its acceleration and velocity. Former research did only provide limited data on the influence of these parameters.
The paper provides an overview on the exergy efficiency of pneumatic and electromechanical drives and its dependency on the mentioned parameters. Since electromechanical drives are often used to replace pneumatic drives both technologies are examined in typical applications for pneumatic drives, including horizontal and vertical movement and sustaining a load for different periods in vertical usage.