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Session: Poster session & Sponsor Exhibition
Session starts: Monday 07 October, 14:00

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Mohammad Kordi (Senior Research Scientist)
Vahid Esfahanian (Professor of Mechanical Eng.)

Abstract:
The invention of bond graph was driven by the need for a common language to model complex systems involving different energetic domains. Bond Graph is a graphical representation of a physical and energy system model. It is based on the representation of the flow of the different types of energy that are involved. An important advantage of this modelling process is its simplicity lends itself to be used for wider variation of system parameters. In this paper, an ORC-based unit for modelling and simulating its performance has been modelled in unsteady state. Our model subject find out the state space differential equations of the system which contains different subsystems such as burner, pumps, heat exchangers, turbine, generator, fuel injection system, nozzle and shaft dynamics. We use bond graph method for modelling this system especially because of complexity of components and stages in addition to nonlinearity performance of the subsystem. Whereas this system is base on energy distribution in all elements. First we draw our system bond graph then according to bond graph we find our state equations that has been simulated with use of initial conditions. Finally, the variability of pressure, temperature, rotational speed and pressure history in each stage according to time have been showen. The effects of variations for some significant parameters including the main component's pressures, temperatures and mass flow and main shaft inertia and velocity have been presented. The results are validated against published literatures. REFERENCES [1] D. Karnopp, D. Margolis, R. Rosenberg, Systems Dynamics a Unified Approach, John Wiley and Sons, 2000. [2] P.C. Breeveld, Multibond Graph Elements in Physical Systems Theory, J. Franklin Ins., 1985.