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Theoretical and experimental characterization of single-screw expanders for ORC applications

Davide Ziviani UGent (2017)
abstract
Medium to low grade waste heat recovery from industrial processes is of particular interest to address both environmental concerns and the need of more efficient thermal systems. Organic Rankine cycles (ORCs) have been demonstrated to be a viable solution to convert waste heat into valuable electric power. In an ORC, the conversion of thermal energy into mechanical energy and, successively, into electrical energy occurs by means of an expander. In this work, a single-screw expander is investigated as a potential technology in the medium to low power output range due to its symmetric rotor configuration. At first, a generalized framework for the simulation of positive dispalcement compressors and expanders (PDSim) has been enhanced and applied to model both conventional and novel compressor types. A Z-compressor has been used as example to show how to handle different numerical challenges. Furthermore, such tool has been employed to develop a comprehensive mechanistic model of a single-screw machine. Secondly, a small scale ORC test rig has been used to characterized the performance of the expander with two working fluids, i.e. R245fa and SES36. This work resulted in numerical and experimental assessments of such machine to improve its design.
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author
promoter
UGent and UGent
organization
alternative title
Theoretische en experimentele karakterisering van enkele-schroefexpanders voor ORC-toepassingen
year
type
dissertation
publication status
published
subject
pages
XXXVII, 255 pages
publisher
Ghent University. Faculty of Engineering and Architecture
place of publication
Ghent, Belgium
defense location
Gent : Instituut der Wetenschappen (Jozef Plateaustraat 22, auditorium K)
defense date
2017-10-05 16:00
ISBN
9789463550475
language
English
UGent publication?
yes
classification
D1
id
8535070
handle
http://hdl.handle.net/1854/LU-8535070
date created
2017-10-20 13:21:12
date last changed
2017-10-23 06:55:57
@phdthesis{8535070,
  abstract     = {Medium to low grade waste heat recovery from industrial processes is of particular interest to address both environmental concerns and the need of more efficient thermal systems. Organic Rankine cycles (ORCs) have been demonstrated to be a viable solution to convert waste heat into valuable electric power. In an ORC, the conversion of thermal energy into mechanical energy and, successively, into electrical energy occurs by means of an expander. 
In this work, a single-screw expander is investigated as a potential technology in the medium to low power output range due to its symmetric rotor configuration. At first, a generalized framework for the simulation of positive dispalcement compressors and expanders (PDSim) has been enhanced and applied to model both conventional and novel compressor types. A Z-compressor has been used as example to show how to handle different numerical challenges. Furthermore, such tool has been employed to develop a comprehensive mechanistic model of a single-screw machine. Secondly, a small scale ORC test rig has been used to characterized the performance of the expander with two working fluids, i.e. R245fa and SES36. This work resulted in numerical and experimental assessments of such machine to improve its design.},
  author       = {Ziviani, Davide},
  isbn         = {9789463550475},
  language     = {eng},
  pages        = {XXXVII, 255},
  publisher    = {Ghent University. Faculty of Engineering and Architecture},
  school       = {Ghent University},
  title        = {Theoretical and experimental characterization of single-screw expanders for ORC applications},
  year         = {2017},
}

Chicago
Ziviani, Davide. 2017. “Theoretical and Experimental Characterization of Single-screw Expanders for ORC Applications”. Ghent, Belgium: Ghent University. Faculty of Engineering and Architecture.
APA
Ziviani, D. (2017). Theoretical and experimental characterization of single-screw expanders for ORC applications. Ghent University. Faculty of Engineering and Architecture, Ghent, Belgium.
Vancouver
1.
Ziviani D. Theoretical and experimental characterization of single-screw expanders for ORC applications. [Ghent, Belgium]: Ghent University. Faculty of Engineering and Architecture; 2017.
MLA
Ziviani, Davide. “Theoretical and Experimental Characterization of Single-screw Expanders for ORC Applications.” 2017 : n. pag. Print.