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

Author

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  • Roberto Pili

    (Institute for Energy Systems, Department of Mechanical Engineering, Technical University of Munich, Garching bei München, 85748, Germany)

  • Hartmut Spliethoff

    (Institute for Energy Systems, Department of Mechanical Engineering, Technical University of Munich, Garching bei München, 85748, Germany)

  • Christoph Wieland

    (Institute for Energy Systems, Department of Mechanical Engineering, Technical University of Munich, Garching bei München, 85748, Germany)

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.

Suggested Citation

  • Roberto Pili & Hartmut Spliethoff & Christoph Wieland, 2017. "Dynamic Simulation of an Organic Rankine Cycle—Detailed Model of a Kettle Boiler," Energies, MDPI, vol. 10(4), pages 1-28, April.
    • Handle: RePEc:gam:jeners:v:10:y:2017:i:4:p:548-:d:96039
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    References listed on IDEAS

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    Cited by:

    1. Pili, Roberto & Romagnoli, Alessandro & Jiménez-Arreola, Manuel & Spliethoff, Hartmut & Wieland, Christoph, 2019. "Simulation of Organic Rankine Cycle – Quasi-steady state vs dynamic approach for optimal economic performance," Energy, Elsevier, vol. 167(C), pages 619-640.
    2. Tim Eller & Florian Heberle & Dieter Brüggemann, 2019. "Transient Simulation of Geothermal Combined Heat and Power Generation for a Resilient Energetic and Economic Evaluation," Energies, MDPI, vol. 12(5), pages 1-16, March.
    3. Eyerer, Sebastian & Dawo, Fabian & Kaindl, Johannes & Wieland, Christoph & Spliethoff, Hartmut, 2019. "Experimental investigation of modern ORC working fluids R1224yd(Z) and R1233zd(E) as replacements for R245fa," Applied Energy, Elsevier, vol. 240(C), pages 946-963.
    4. Jiménez-Arreola, Manuel & Pili, Roberto & Wieland, Christoph & Romagnoli, Alessandro, 2018. "Analysis and comparison of dynamic behavior of heat exchangers for direct evaporation in ORC waste heat recovery applications from fluctuating sources," Applied Energy, Elsevier, vol. 216(C), pages 724-740.
    5. Eyerer, S. & Schifflechner, C. & Hofbauer, S. & Bauer, W. & Wieland, C. & Spliethoff, H., 2020. "Combined heat and power from hydrothermal geothermal resources in Germany: An assessment of the potential," Renewable and Sustainable Energy Reviews, Elsevier, vol. 120(C).
    6. Pili, R. & Eyerer, S. & Dawo, F. & Wieland, C. & Spliethoff, H., 2020. "Development of a non-linear state estimator for advanced control of an ORC test rig for geothermal application," Renewable Energy, Elsevier, vol. 161(C), pages 676-690.
    7. Imran, Muhammad & Pili, Roberto & Usman, Muhammad & Haglind, Fredrik, 2020. "Dynamic modeling and control strategies of organic Rankine cycle systems: Methods and challenges," Applied Energy, Elsevier, vol. 276(C).

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