Details
| Original language | English |
|---|---|
| Title of host publication | Proceedings of the 6th International Seminar on ORC Power Systems |
| Editors | Christoph Wieland, Sotirios Karellas, Sylvain Quoilin, Christopher Schifflechner, Fabian Dawo, Hartmut Spliethoff |
| ISBN (electronic) | 978-3-00-070686-8 |
| Publication status | Published - Oct 2021 |
| Event | 6th International Seminar on ORC Power Systems - Virtual, Online Duration: 11 Oct 2021 → 13 Oct 2021 |
Publication series
| Name | International Seminar on ORC Power Systems |
|---|---|
| ISSN (electronic) | 2709-7609 |
Abstract
Keywords
- Optimization, Organic rankine cycle, ORC, Expander
ASJC Scopus subject areas
- Engineering(all)
- Mechanical Engineering
- Energy(all)
- Energy Engineering and Power Technology
- Engineering(all)
- Engineering (miscellaneous)
- Energy(all)
- Renewable Energy, Sustainability and the Environment
Sustainable Development Goals
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Proceedings of the 6th International Seminar on ORC Power Systems. ed. / Christoph Wieland; Sotirios Karellas; Sylvain Quoilin; Christopher Schifflechner; Fabian Dawo; Hartmut Spliethoff. 2021. 58 ( International Seminar on ORC Power Systems).
Research output: Chapter in book/report/conference proceeding › Conference contribution › Research › peer review
}
TY - GEN
T1 - Optimization of a Rankine Cycle integrated in a Long-Range Intercity Bus with expander sizing
AU - Hadamitzky, Patrick
AU - Hebeler, Maximilan
AU - Köhler, Jürgen
AU - Scharf, Roland
PY - 2021/10
Y1 - 2021/10
N2 - In this work an optimization of a Rankine cycle, nested into a long-range intercity bus for the recovery of exhaust gas exergy is carried out. In order to optimize WHR-systems, it is of great importance to carry out a holistic optimization of the system in combination with all its subsystems and components. The applied working fluid is cyclopentane and the expander design is of scroll type. The main contributors to efficiency changes are the expansion machine and the heat exchangers. As can be seen in the literature, the process optimization is often carried out by assuming a constant efficiency of the expansion machine. If this is done, the relationship between the thermodynamic points of state applied to the in- and outlet of the expander and its efficiency is neglected. Thus, the full optimization potential of the process remains unused and leads to a non-realistic behaviour of the expander. In this paper a holistic approach to optimize the expansion machine and the thermodynamic process states is presented. The optimization is carried out by using accurate thermophysical properties of the working fluid. Part of this optimization is a novel approach to enable the scalability of the expander. The basis is a semi-empirical model well-known in the literature. This model allows the prediction of the expander performance in a wide operating range. To enable the optimization of the sizing of the expander, the model parameters are scaled based on the geometry and selected characteristic numbers. A stationary optimization is carried out. Thanks to its reasonable computational effort of the modelling approaches, an application in transient optimizations is feasible in future works.
AB - In this work an optimization of a Rankine cycle, nested into a long-range intercity bus for the recovery of exhaust gas exergy is carried out. In order to optimize WHR-systems, it is of great importance to carry out a holistic optimization of the system in combination with all its subsystems and components. The applied working fluid is cyclopentane and the expander design is of scroll type. The main contributors to efficiency changes are the expansion machine and the heat exchangers. As can be seen in the literature, the process optimization is often carried out by assuming a constant efficiency of the expansion machine. If this is done, the relationship between the thermodynamic points of state applied to the in- and outlet of the expander and its efficiency is neglected. Thus, the full optimization potential of the process remains unused and leads to a non-realistic behaviour of the expander. In this paper a holistic approach to optimize the expansion machine and the thermodynamic process states is presented. The optimization is carried out by using accurate thermophysical properties of the working fluid. Part of this optimization is a novel approach to enable the scalability of the expander. The basis is a semi-empirical model well-known in the literature. This model allows the prediction of the expander performance in a wide operating range. To enable the optimization of the sizing of the expander, the model parameters are scaled based on the geometry and selected characteristic numbers. A stationary optimization is carried out. Thanks to its reasonable computational effort of the modelling approaches, an application in transient optimizations is feasible in future works.
KW - Optimization
KW - Organic rankine cycle
KW - ORC
KW - Expander
UR - http://www.scopus.com/inward/record.url?scp=85143415811&partnerID=8YFLogxK
M3 - Conference contribution
SN - 9783000706868
T3 - International Seminar on ORC Power Systems
BT - Proceedings of the 6th International Seminar on ORC Power Systems
A2 - Wieland, Christoph
A2 - Karellas, Sotirios
A2 - Quoilin, Sylvain
A2 - Schifflechner, Christopher
A2 - Dawo, Fabian
A2 - Spliethoff, Hartmut
T2 - 6th International Seminar on ORC Power Systems
Y2 - 11 October 2021 through 13 October 2021
ER -