Dynamic modeling and optimal control strategy of waste heat recovery Organic Rankine Cycles |
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Authors: | Sylvain Quoilin Richard Aumann Andreas Grill Andreas Schuster Vincent Lemort Hartmut Spliethoff |
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Affiliation: | 1. Thermodynamics Laboratory, University of Liège, Campus du Sart Tilman, B49, B-4000 Liège, Belgium;2. Technische Universität München, Institute for Energy Systems, Boltzmannstr. 15, 85748 Garching, Germany |
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Abstract: | Organic Rankine Cycles (ORCs) are particularly suitable for recovering energy from low-grade heat sources. This paper describes the behavior of a small-scale ORC used to recover energy from a variable flow rate and temperature waste heat source. A traditional static model is unable to predict transient behavior in a cycle with a varying thermal source, whereas this capability is essential for simulating an appropriate cycle control strategy during part-load operation and start and stop procedures. A dynamic model of the ORC is therefore proposed focusing specifically on the time-varying performance of the heat exchangers, the dynamics of the other components being of minor importance. Three different control strategies are proposed and compared. The simulation results show that a model predictive control strategy based on the steady-state optimization of the cycle under various conditions is the one showing the best results. |
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Keywords: | Organic Rankine Cycle Waste heat recovery ORC Volumetric expander Dynamic modeling Control strategy |
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