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Performance evaluation of organic Rankine cycle architectures: application to waste heat valorisation

Steven Lecompte (UGent)
(2016)
Author
Promoter
(UGent) and (UGent)
Organization
Project
IWT SBO-110006
Abstract
In our society, there is an ever increasing need for electricity. However, today most of the electricity is generated by burning fossil fuels in a thermal power plant. A proposed alternative is to make use of low temperature heat from renewable sources (geothermal and solar) or waste heat (excess heat that is dumped into the atmosphere) in an organic Rankine cycle (ORC) to generate electricity. The purpose of the presented work is to support further adoption of ORC technology. To achieve this, two main challenges need to be resolved. First, sound criteria should be devised to compare and size ORCs and secondly the performance of the ORC should be increased further. From literature it is clear that novel ORC architectures have the opportunity to increase the performance of the basic subcritical ORC. However these studies are not cross comparable. As such, a new screening approach is created which rigorously compares and quantifies the potential of three different ORC architectures. Secondly, the sizing and the financial appraisal of the ORC is tackled by introducing a multi-objective optimization which combines financial and thermodynamic criteria in the optimization objectives. Finally, experimentally validated part-load models of the ORC were developed. These part-load models are crucial to predict the actual power output of time varying heat sources like waste heat streams. In addition, the models permit to investigate the concept of retrofitting existing subcritical ORCs to work under the more optimal working regime of partial evaporation.
Keywords
organic Rankine cycle, numerical optimization, thermodynamics, experimental, thermo-economic

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Citation

Please use this url to cite or link to this publication:

Chicago
Lecompte, Steven. 2016. “Performance Evaluation of Organic Rankine Cycle Architectures: Application to Waste Heat Valorisation”. Ghent, Belgium: Ghent University. Faculty of Engineering and Architecture.
APA
Lecompte, Steven. (2016). Performance evaluation of organic Rankine cycle architectures: application to waste heat valorisation. Ghent University. Faculty of Engineering and Architecture, Ghent, Belgium.
Vancouver
1.
Lecompte S. Performance evaluation of organic Rankine cycle architectures: application to waste heat valorisation. [Ghent, Belgium]: Ghent University. Faculty of Engineering and Architecture; 2016.
MLA
Lecompte, Steven. “Performance Evaluation of Organic Rankine Cycle Architectures: Application to Waste Heat Valorisation.” 2016 : n. pag. Print.
@phdthesis{7223134,
  abstract     = {In our society, there is an ever increasing need for electricity. However, today most of the electricity is generated by burning fossil fuels in a thermal power plant. A proposed alternative is to make use of low temperature heat from renewable sources (geothermal and solar) or waste heat (excess heat that is dumped into the atmosphere) in an organic Rankine cycle (ORC) to generate electricity. The purpose of the presented work is to support further adoption of ORC technology. To achieve this, two main challenges need to be resolved. First, sound criteria should be devised to compare and size ORCs and secondly the performance of the ORC should be increased further. From literature it is clear that novel ORC architectures have the opportunity to increase the performance of the basic subcritical ORC. However these studies are not cross comparable. As such, a new screening approach is created which rigorously compares and quantifies the potential of three different ORC architectures. Secondly, the sizing and the financial appraisal of the ORC is tackled by introducing a multi-objective optimization which combines financial and thermodynamic criteria in the optimization objectives. Finally, experimentally validated part-load models of the ORC were developed. These part-load models are crucial to predict the actual power output of time varying heat sources like waste heat streams. In addition, the models permit to investigate the concept of retrofitting existing subcritical ORCs to work under the more optimal working regime of partial evaporation.},
  author       = {Lecompte, Steven},
  isbn         = {9789085788973},
  keyword      = {organic Rankine cycle,numerical optimization,thermodynamics,experimental,thermo-economic},
  language     = {eng},
  pages        = {XXXI, 239},
  publisher    = {Ghent University. Faculty of Engineering and Architecture},
  school       = {Ghent University},
  title        = {Performance evaluation of organic Rankine cycle architectures: application to waste heat valorisation},
  year         = {2016},
}