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Modelling and preliminary design of a variable-BVR rotary valve expander with an integrated linear generator

Sergei Gusev UGent, Davide Ziviani UGent, Jasper De Viaene UGent, Stijn Derammelaere UGent and Martijn van den Broek UGent (2016) 23rd International Compressor Engineering Conference.
abstract
The Organic Rankine Cycle (ORC) is currently one of the most suitable technologies to convert waste heat into me- chanical work or electricity. While large and medium scale systems are widely available on the market for various temperature and power ranges, small-scale ORCs below 50 kWe are still in a pre-commercial phase because of the relatively high specific cost per kW and the lack of technologically mature and high efficient expanders. Small-scale ORC installations for automotive applications operate at variable heat source profiles combined with the fluctuating power demand from a vehicle. The prediction of an optimum operating point is challenging. Exhaust gases are a limited heat source, therefore the more heat is recovered at an optimal cycle efficiency level, the more power is produced. By using advanced cycle architectures (e.g. trilateral ORCs, partial-evaporating ORCs, zeotropic mixture ORCs, etc.) and the right fluids, an optimum can be found. An expander with a variable built-in volume ratio (BVR) can allow to operate at optimal conditions within the whole range of pressures imposed by the variable heat source and heat sink. Adjustable expanders are known but mainly limited to large-scale applications. Neither a positive displacement expander, nor a turbine can provide an optimal expansion of a working fluid in a wide range of operation conditions. As a response to this challenge, the concept of a variable-BVR piston expander with an integrated linear generator is proposed in this paper. The internal part-load control is based on a rotary valve which controls the suction and discharge processes in the expander. An analytic model has been developed to relate the position of the valve with the motion of the piston. By means of a deterministic model, the influence of the main design parameters is investigated. A preliminary design based on the expander model results is described and the predicted performance over the operating range of interest is discussed.
Please use this url to cite or link to this publication:
author
organization
year
type
conference
publication status
published
subject
keyword
linear generator, automotive, variable BVR, Small-scale ORC
in
23rd International Compressor Engineering Conference
pages
10 pages
place of publication
Purdue University, West Lafayette, USA
conference name
23rd International Compressor Engineering Conference
conference location
Purdue University, West Lafayette, USA
conference start
2016-07-11
conference end
2016-07-14
project
IOFPRO2015003101​
language
English
UGent publication?
yes
classification
C1
copyright statement
I have retained and own the full copyright for this publication
id
8042822
handle
http://hdl.handle.net/1854/LU-8042822
alternative location
https://www.conftool.com/2016Purdue/index.php/Gusev-2016-Modelling_and_Preliminary_Design_of_a_Variable-BVR_Rotary_Valve_Expander_with_an_Integrated_Linear.pdf?page=downloadPaper&filename=Gusev-2016-Modelling_and_Preliminary_Design_of_a_Variable-BVR_Rotary_Valve_Expander_with_an_Integrated_Linear.pdf&form_id=1539
date created
2016-08-01 20:59:39
date last changed
2017-01-02 09:53:15
@inproceedings{8042822,
  abstract     = {The Organic Rankine Cycle (ORC) is currently one of the most suitable technologies to convert waste heat into me-
chanical work or electricity. While large and medium scale systems are widely available on the market for various
temperature and power ranges, small-scale ORCs below 50 kWe are still in a pre-commercial phase because of the
relatively high specific cost per kW and the lack of technologically mature and high efficient expanders. Small-scale
ORC installations for automotive applications operate at variable heat source profiles combined with the fluctuating
power demand from a vehicle. The prediction of an optimum operating point is challenging. Exhaust gases are a limited heat source, therefore the more heat is recovered at an optimal cycle efficiency level, the more power is produced. By using advanced cycle architectures (e.g. trilateral ORCs, partial-evaporating ORCs, zeotropic mixture ORCs, etc.) and the right fluids, an optimum can be found. An expander with a variable built-in volume ratio (BVR) can allow to operate at optimal conditions within the whole range of pressures imposed by the
variable heat source and heat sink. Adjustable expanders are known but mainly limited to large-scale applications.
Neither a positive displacement expander, nor a turbine can provide an optimal expansion of a working fluid in a wide
range of operation conditions. As a response to this challenge, the concept of a variable-BVR piston expander with an integrated linear generator is proposed in this paper. The internal part-load control is based on a rotary valve which controls the suction and discharge processes in the expander. An analytic model has been developed to relate the position of the valve with the motion of the piston. By means of a deterministic model, the influence of the main design parameters is investigated. A preliminary design
based on the expander model results is described and the predicted performance over the operating range of interest is
discussed.},
  author       = {Gusev, Sergei and Ziviani, Davide and De Viaene, Jasper and Derammelaere, Stijn and van den Broek, Martijn},
  booktitle    = {23rd International Compressor Engineering Conference},
  keyword      = {linear generator,automotive,variable BVR,Small-scale ORC},
  language     = {eng},
  location     = {Purdue University, West Lafayette, USA},
  pages        = {10},
  title        = {Modelling and preliminary design of a variable-BVR rotary valve expander with an integrated linear generator},
  url          = {https://www.conftool.com/2016Purdue/index.php/Gusev-2016-Modelling\_and\_Preliminary\_Design\_of\_a\_Variable-BVR\_Rotary\_Valve\_Expander\_with\_an\_Integrated\_Linear.pdf?page=downloadPaper\&filename=Gusev-2016-Modelling\_and\_Preliminary\_Design\_of\_a\_Variable-BVR\_Rotary\_Valve\_Expander\_with\_an\_Integrated\_Linear.pdf\&form\_id=1539},
  year         = {2016},
}

Chicago
Gusev, Sergei, Davide Ziviani, Jasper De Viaene, Stijn Derammelaere, and Martijn van den Broek. 2016. “Modelling and Preliminary Design of a variable-BVR Rotary Valve Expander with an Integrated Linear Generator.” In 23rd International Compressor Engineering Conference. Purdue University, West Lafayette, USA.
APA
Gusev, S., Ziviani, D., De Viaene, J., Derammelaere, S., & van den Broek, M. (2016). Modelling and preliminary design of a variable-BVR rotary valve expander with an integrated linear generator. 23rd International Compressor Engineering Conference. Presented at the 23rd International Compressor Engineering Conference, Purdue University, West Lafayette, USA.
Vancouver
1.
Gusev S, Ziviani D, De Viaene J, Derammelaere S, van den Broek M. Modelling and preliminary design of a variable-BVR rotary valve expander with an integrated linear generator. 23rd International Compressor Engineering Conference. Purdue University, West Lafayette, USA; 2016.
MLA
Gusev, Sergei, Davide Ziviani, Jasper De Viaene, et al. “Modelling and Preliminary Design of a variable-BVR Rotary Valve Expander with an Integrated Linear Generator.” 23rd International Compressor Engineering Conference. Purdue University, West Lafayette, USA, 2016. Print.