A Completed State Equations Model for the Simu-lation of Compression and Expansion of Gases- Application to Air and Hydrogen.
- Author Alfred Rufer
- DOI https://ww
- Country : Switzerland
- Subject :
Keywords : Gas compression, Gas expansion, State equations, Simulation model, Hydrogen.
Abstract
For modeling the compression and expansion of gases many different state equations can be used when the mechanical variables of compressors and expansion machines are simulated. The present paper simulates and compares different methods based on state equations combined with an integrated thermal model. The simplest model uses simple expressions where only the volumetric ratio is considered. Then different ways to use more complex state equations are presented for the simulation of non-ideal gases like hydrogen. The Van der Waals and the Beattie Bridgeman state equations take in account the attraction forces between molecules and the volume occupied by them. The simulations represent the phenomena in a specific piston cylinder system. Air and hydrogen compressions are defined between 15 and 160 bar. The behaviour in expansion mode is simulated with the same assembly, but where an intake action at constant pressure is realized during a first section of the stroke and which is followed by a real expansion process during the remaining part of the same stroke by closing the intake valve.
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