Conference article

Transient modelling and simulation of a double-stage Organic Rankine Cycle

Tim Eller
Institute of Engineering Thermodynamics and Transport Processes (LTTT), Center of Energy Technology (ZET), University of Bayreuth, 95440 Bayreuth, German

Florian Heberle
Institute of Engineering Thermodynamics and Transport Processes (LTTT), Center of Energy Technology (ZET), University of Bayreuth, 95440 Bayreuth, German

Dieter Brüggemann
Institute of Engineering Thermodynamics and Transport Processes (LTTT), Center of Energy Technology (ZET), University of Bayreuth, 95440 Bayreuth, German

Download articlehttp://dx.doi.org/10.3384/ecp19157679

Published in: Proceedings of the 13th International Modelica Conference, Regensburg, Germany, March 4–6, 2019

Linköping Electronic Conference Proceedings 157:70, s. 8

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Published: 2019-02-01

ISBN: 978-91-7685-122-7

ISSN: 1650-3686 (print), 1650-3740 (online)

Abstract

Geothermal energy is a renewable resource for power and heat production. For low enthalpy reservoirs the geothermal energy is usually converted to electricity by an Organic Rankine Cycle (ORC). The efficiency and profitability of these power plants can be increased by combined heat and power production. In this study, a dynamic model of a double-stage ORC power plant is developed to investigate and evaluate geothermal combined heat and power plant concepts. The simulation model is validated by operational data of a real geothermal power plant in the South of Germany. For the validation, the relative root mean squared error (RRMSE) is used. In addition, the coefficient of correlation is calculated to evaluate the dynamic behavior. The results show that the electrical power output of the power plant can be predicted by an RRMSE of 3.9 %. The coefficient of correlation is 0.99 and shows that the model is capable to predict the dynamic behavior of the power plant.

Keywords

transient simulation, Organic Rankine Cycle, geothermal heat and power production

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