A model-based optimal operation strategy for an energy storage system exhibiting significant stand-by energy losses is presented. Specifically, a thermodynamic model of an advanced adiabatic compressed air energy storage (AA-CAES) plant, consisting of compression/expansion trains, a thermal energy storage (TES) system, and an underground cavern for compressed air storage, is used in this work. ...

Energy saving for compressed air production is of great importance all over the world due to its energy cost and indispensable utility in industrial sector. In recent years, oil-injected two-stage screw compressors, especially driven by dual motors, are becoming a promising alternative other compression equipment their extraordinary efficiency high reliability wide range applications. However, ...

cement powder size classification efficiency significantly affects quality of final product and extent of energy consumption in clinker grinding circuits. static and dynamic or high efficiency air separators are being used widely in closed circuit with multi-compartment tube ball mills, high pressure grinding rolls (hpgr) and more recently vertical roller mills (vrm) units in cement plants to c...

There is a growing need for compressed air free of entrained oil to be used in industry. In many cases it can be supplied by oil flooded screw compressors with multi stage filtration systems, or by oil free screw compressors. However, if water injected screw compressors can be made to operate reliably, they could be more efficient and therefore cheaper to operate. Unfortunately, to date, such m...

In order to improve the energy efficiency of multi-actuator pneumatic systems, a control scheme for recovery exhausted compressed air is designed and studied herein. This paper explains procedure development balanced operation system through collection reuse air. Compared with traditional motion actuators, significant savings can be achieved, while dynamic behavior cylinders from which collecte...

A problem with pneumatic positioning systems is the low energetic efficiency. This paper presents a structure of a compressed air saving for pneumatic positioning systems with capacity to move high loads. This structure use the loading to save compressed air and thus to increase the energetic efficiency of these systems. This configuration adds a fast switching on/off valve in a feedback betwee...

Conventional data envelopment analysis (DEA) models are used to measure efficiency score of production systems when they are considered as black boxes and their internal relationship is ignored. This paper deals with a common special case of network systems which is called multi-stage production system and can be generalized to many organizations. A multi stage production system has some stages...