Benchmark of existing energy conversion efficiency definitions for pneumatic vacuum generators

Abstract

To offer an ideal design solution for vacuum handling systems, taking energetic aspects into account is essential. Therefore the energy conversion efficiency has become a commonly used parameter for describing the efficiency a system. In Literature there are already a few definitions of the energy conversion efficiency of de Laval nozzles respectively pneumatic vacuum generators. This paper shows a benchmark of the existing energy conversion efficiency definitions with respect to vacuum handling, the practical usage in industry and the possibility for comparison with other generation forms. In the end, an approach for a generally applicable exergy based definition is given. In addition, the measurement of an example vacuum system is shown and analyzed.