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Energies 2017, 10(4), 548; doi:10.3390/en10040548

Dynamic Simulation of an Organic Rankine Cycle—Detailed Model of a Kettle Boiler

Institute for Energy Systems, Department of Mechanical Engineering, Technical University of Munich, Garching bei München, 85748, Germany
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Academic Editor: Antonio Calvo Hernández
Received: 1 March 2017 / Revised: 10 April 2017 / Accepted: 12 April 2017 / Published: 17 April 2017
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Abstract

Organic Rankine Cycles (ORCs) are nowadays a valuable technology to produce electricity from low and medium temperature heat sources, e.g., in geothermal, biomass and waste heat recovery applications. Dynamic simulations can help improve the flexibility and operation of such plants, and guarantee a better economic performance. In this work, a dynamic model for a multi-pass kettle evaporator of a geothermal ORC power plant has been developed and its dynamics have been validated against measured data. The model combines the finite volume approach on the tube side and a two-volume cavity on the shell side. To validate the dynamic model, a positive and a negative step function in heat source flow rate is applied. The simulation model performed well in both cases. The liquid level appeared the most challenging quantity to simulate. A better agreement in temperature was achieved by increasing the volume flow rate of the geothermal brine by 2% over the entire simulation. Measurement errors, discrepancies in working fluid and thermal brine properties and uncertainties in heat transfer correlations can account for this. In the future, the entire geothermal power plant will be simulated, and suggestions to improve its dynamics and control by means of simulations will be provided. View Full-Text
Keywords: Organic Rankine Cycle (ORC); evaporator; kettle; dynamic simulation; geothermal; two-volume cavity Organic Rankine Cycle (ORC); evaporator; kettle; dynamic simulation; geothermal; two-volume cavity
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Pili, R.; Spliethoff, H.; Wieland, C. Dynamic Simulation of an Organic Rankine Cycle—Detailed Model of a Kettle Boiler. Energies 2017, 10, 548.

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