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Modelling and design of a two-phase reciprocating expander for integration in a trilateral flash cycle

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Abstract
Two-phase expansion devices are used in a multitude of cycles and allow for an increase of the overall system efficiency. It has been shown that the trilateral flash cycle can improve the power output from the recovery of low temperature residual heat compared to the classic subcritical Organic Rankine cycle. Theoretical studies predict an improvement of at least 15%. The expanders that are mainly investigated for the purpose of two-phase expansion are the Lysholm and the reciprocating expanders. From these two, the reciprocating expander has been researched the least as it is not as easy to model. It has been shown that to model the reciprocating expander, there is a need to describe the non-equilibrium state of the phases during the expansion process. This study aims to fill the knowledge gap that exists for two-phase reciprocating expanders, by constructing a predictive model to describe the expansion process and the non-equilibrium phenomena occurring. The constructed model makes use of the homogeneous relaxation model to describe the thermal non-equilibrium between the phases. The working fluid used in initial modelling is cyclopentane. The resulting model will be used to formulate design guidelines for the construction of a two-phase reciprocating expander. This prototype will be used to gain experimental data, with which the theoretically predicted efficiency improvement can be validated.

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Citation

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MLA
van Heule, Xander, et al. “Modelling and Design of a Two-Phase Reciprocating Expander for Integration in a Trilateral Flash Cycle.” Proceedings of the 6th International Seminar on ORC Power Systems, edited by Christoph Wieland et al., Technical University of Munich, 2021.
APA
van Heule, X., Skiadopoulos, A., Manolakos, D., De Paepe, M., & Lecompte, S. (2021). Modelling and design of a two-phase reciprocating expander for integration in a trilateral flash cycle. In C. Wieland, S. Karellas, S. Quoilin, C. Schifflechner, F. Dawo, & H. Spliethoff (Eds.), Proceedings of the 6th International Seminar on ORC Power Systems. virtual: Technical University of Munich.
Chicago author-date
Heule, Xander van, Anastasios Skiadopoulos, Dimitrios Manolakos, Michel De Paepe, and Steven Lecompte. 2021. “Modelling and Design of a Two-Phase Reciprocating Expander for Integration in a Trilateral Flash Cycle.” In Proceedings of the 6th International Seminar on ORC Power Systems, edited by Christoph Wieland, Sotirios Karellas, Sylvain Quoilin, Christopher Schifflechner, Fabian Dawo, and Hartmut Spliethoff. Technical University of Munich.
Chicago author-date (all authors)
van Heule, Xander, Anastasios Skiadopoulos, Dimitrios Manolakos, Michel De Paepe, and Steven Lecompte. 2021. “Modelling and Design of a Two-Phase Reciprocating Expander for Integration in a Trilateral Flash Cycle.” In Proceedings of the 6th International Seminar on ORC Power Systems, ed by. Christoph Wieland, Sotirios Karellas, Sylvain Quoilin, Christopher Schifflechner, Fabian Dawo, and Hartmut Spliethoff. Technical University of Munich.
Vancouver
1.
van Heule X, Skiadopoulos A, Manolakos D, De Paepe M, Lecompte S. Modelling and design of a two-phase reciprocating expander for integration in a trilateral flash cycle. In: Wieland C, Karellas S, Quoilin S, Schifflechner C, Dawo F, Spliethoff H, editors. Proceedings of the 6th International Seminar on ORC Power Systems. Technical University of Munich; 2021.
IEEE
[1]
X. van Heule, A. Skiadopoulos, D. Manolakos, M. De Paepe, and S. Lecompte, “Modelling and design of a two-phase reciprocating expander for integration in a trilateral flash cycle,” in Proceedings of the 6th International Seminar on ORC Power Systems, virtual, 2021.
@inproceedings{8725807,
  abstract     = {{Two-phase expansion devices are used in a multitude of cycles and allow for an increase of the overall system efficiency. It has been shown that the trilateral flash cycle can improve the power output from the recovery of low temperature residual heat compared to the classic subcritical Organic Rankine cycle. Theoretical studies predict an improvement of at least 15%. The expanders that are mainly investigated for the purpose of two-phase expansion are the Lysholm and the reciprocating expanders. From these two, the reciprocating expander has been researched the least as it is not as easy to model. It has been shown that to model the reciprocating expander, there is a need to describe the non-equilibrium state of the phases during the expansion process. This study aims to fill the knowledge gap that exists for two-phase reciprocating expanders, by constructing a predictive model to describe the expansion process and the non-equilibrium phenomena occurring. The constructed model makes use of the homogeneous relaxation model to describe the thermal non-equilibrium between the phases. The working fluid used in initial modelling is cyclopentane. The resulting model will be used to formulate design guidelines for the construction of a two-phase reciprocating expander. This prototype will be used to gain experimental data, with which the theoretically predicted efficiency improvement can be validated.}},
  articleno    = {{27}},
  author       = {{van Heule, Xander and Skiadopoulos, Anastasios and Manolakos, Dimitrios and De Paepe, Michel and Lecompte, Steven}},
  booktitle    = {{Proceedings of the 6th International Seminar on ORC Power Systems}},
  editor       = {{Wieland, Christoph and Karellas, Sotirios and Quoilin, Sylvain and Schifflechner, Christopher and Dawo, Fabian and Spliethoff, Hartmut}},
  isbn         = {{9783000706868}},
  issn         = {{2709-7609}},
  language     = {{eng}},
  location     = {{virtual}},
  pages        = {{9}},
  publisher    = {{Technical University of Munich}},
  title        = {{Modelling and design of a two-phase reciprocating expander for integration in a trilateral flash cycle}},
  url          = {{https://mediatum.ub.tum.de/1632642?show_id=1632938&liststyle=list}},
  year         = {{2021}},
}