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S. Horngacher, M. Kozek:
"Modelling of air pressure dynamics for clean room facilities";
Talk: 6th Vienna Mathmod 09, Vienna; 2009-02-11 - 2009-02-13; in: "Proceedings of the 6th Mathmod Vienna 09", Argesim Report, No. 35 (2009), ISBN: 978-3-901608-35-3; Paper ID 200, 9 pages.

In the pharmaceutical industry strict specifications concerning overpressure and actively overpressure controlling should guarantee that only preconditioned air enters clean room facilities. A modular and easily to parameterize model is created in Simulink to describe the system dynamics and to avoid pressure surges, which occur when doors between different control zones are closed. In addition to state of the art mathematical modelling, which is based on non-stationary mass balances and basic thermodynamic equations, the strongly non-linear behaviour of some components is identified from experimental data of a laboratory test set-up and of the real plant.
Experimental validation shows excellent results. The Phenomenon "pressure surge" turns out to be the consequence of integral controller action and measurement bias, which was proven by both the model prediction and measurements.