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3D CFD analysis of a twin screw expander for small scale ORC systems

Iva Papeš, Joris Degroote UGent and Jan Vierendeels UGent (2014) Proceedings of the 11th World Congress on Computational Mechanics. p.7207-7217
abstract
Among a number of solutions to generate electricity from low temperature heat sources, the Organic Rankine Cycle (ORC) is the most widely used. In small scale ORC systems (below 300 kWe) with a low temperature heat source (from 55◦C till 150◦C), twin screw expanders are commonly used to recover the mechanical power. In this paper, 3D CFD (Computational Fluid Dynamics) calculations of a twin screw expander, with R245fa as a working fluid, are performed. The mesh motion is handled by an in-house code which generates a block-structured grid with the help of solutions of Laplace problems. Since the ideal gas equation of state shows big deviations in the ORC working conditions, the cubic Aungier Redlich-Kwong equation of state has been used because of its relative simplicity and low computational cost. The performance of the expander is evaluated for different pressure ratios and for two different designs. It is observed that the leakage flows have a significant effect on the screw expander’s efficiency. In order to evaluate the effects of individual clearance gaps on the performance of the expander, diagrams with the mass flow rate as a function of the rotation angle are provided.
Please use this url to cite or link to this publication:
author
organization
year
type
conference
publication status
published
subject
keyword
R245fa, Screw expander, ORC, Redlich-Kwong, real gas
in
Proceedings of the 11th World Congress on Computational Mechanics
pages
7207 - 7217
conference name
11th World Congress on Computational Mechanics (WCCM XI - 2014)
conference location
Barcelona, Spain
conference start
2014-07-20
conference end
2014-07-25
ISBN
9788494284472
language
English
UGent publication?
yes
classification
C1
copyright statement
I have transferred the copyright for this publication to the publisher
id
5701087
handle
http://hdl.handle.net/1854/LU-5701087
alternative location
http://www.wccm-eccm-ecfd2014.org/frontal/Ebook.asp
date created
2014-09-11 14:38:00
date last changed
2016-12-19 15:36:35
@inproceedings{5701087,
  abstract     = {Among a number of solutions to generate electricity from low temperature heat sources, the Organic Rankine Cycle (ORC) is the most widely used. In small scale ORC systems (below 300 kWe) with a low temperature heat source (from 55\unmatched{25e6}C till 150\unmatched{25e6}C), twin screw expanders are commonly used to recover the mechanical power. In this paper, 3D CFD (Computational Fluid Dynamics) calculations of a twin screw expander, with R245fa as a working fluid, are performed. The mesh motion is handled by an in-house code which generates a block-structured grid with the help of solutions of Laplace problems. Since the ideal gas equation of state shows big deviations in the ORC working conditions, the cubic Aungier Redlich-Kwong equation of state has been used because of its relative simplicity and low computational cost.
The performance of the expander is evaluated for different pressure ratios and for two different designs. It is observed that the leakage flows have a significant effect on the screw expander{\textquoteright}s efficiency. In order to evaluate the effects of individual clearance gaps on the performance of the expander, diagrams with the mass flow rate as a function of the rotation angle are provided.},
  author       = {Pape\v{s}, Iva and Degroote, Joris and Vierendeels, Jan},
  booktitle    = {Proceedings of the 11th World Congress on Computational Mechanics},
  isbn         = {9788494284472},
  keyword      = {R245fa,Screw expander,ORC,Redlich-Kwong,real gas},
  language     = {eng},
  location     = {Barcelona, Spain},
  pages        = {7207--7217},
  title        = {3D CFD analysis of a twin screw expander for small scale ORC systems},
  url          = {http://www.wccm-eccm-ecfd2014.org/frontal/Ebook.asp},
  year         = {2014},
}

Chicago
Papeš, Iva, Joris Degroote, and Jan Vierendeels. 2014. “3D CFD Analysis of a Twin Screw Expander for Small Scale ORC Systems.” In Proceedings of the 11th World Congress on Computational Mechanics, 7207–7217.
APA
Papeš, I., Degroote, J., & Vierendeels, J. (2014). 3D CFD analysis of a twin screw expander for small scale ORC systems. Proceedings of the 11th World Congress on Computational Mechanics (pp. 7207–7217). Presented at the 11th World Congress on Computational Mechanics (WCCM XI - 2014).
Vancouver
1.
Papeš I, Degroote J, Vierendeels J. 3D CFD analysis of a twin screw expander for small scale ORC systems. Proceedings of the 11th World Congress on Computational Mechanics. 2014. p. 7207–17.
MLA
Papeš, Iva, Joris Degroote, and Jan Vierendeels. “3D CFD Analysis of a Twin Screw Expander for Small Scale ORC Systems.” Proceedings of the 11th World Congress on Computational Mechanics. 2014. 7207–7217. Print.