Compressed air system optimization Sandie B. Nielsen Søren Draborg Claus M. Hvenegaard Danish Technological Institute, Department of Energy & Climate Abstract There are considerable opportunities for increased efficiency in compressed air systems that can be realized through demand-based control methods and use of energy efficient components. Experiences from studies show that in many cases a potential of up to 30% still can be realized despite years of focus on energy efficiency. The primary purpose of the project was to develop a calculation tool for compressed air systems, which enables the user to quickly and easily make calculations of different configurations of air compressors with varying capacity control. The calculation program is accompanied by a user guide that illustrates the use of the calculation tool. In connection with the above-mentioned calculation tool, a guide in design of energy-efficient compressed air systems has been developed, as the experience is that the interaction between the capacity of compressors, air treatment, compressed air tanks and the overall control of the installations in relation to the actual needs is far from optimal. In addition, a guide has been developed in which it is explained how measurements should be performed on compressed air systems. The development of the calculation tool has taken place in close collaboration with a supplier of compressed air systems, an educational institution and an industrial company represented by:  Kaeser Kompressorer A/S Denmark  The Mechanical Engineering School Copenhagen  Topsoe A/S The project was funded by the Danish ELFORSK program and the participating companies was led by Danish Technological Institute.