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One-Dimensional Modelling of a Trilateral Flash Cycle System with Two-Phase Twin-Screw Expanders for Industrial Low-Grade Heat to Power Conversion

1
Institute of Energy Futures, RCUK Centre for Sustainable Energy use in Food chains (CSEF), Brunel University London, Uxbridge UB8 3PH, UK
2
Howden Compressors Ltd., Renfrew PA4 8XJ, UK
3
Spirax Sarco Engineering PLC., Cheltenham GL51 9NQ, UK
*
Author to whom correspondence should be addressed.
Designs 2019, 3(3), 41; https://doi.org/10.3390/designs3030041
Received: 30 May 2019 / Revised: 25 July 2019 / Accepted: 26 July 2019 / Published: 29 July 2019
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Abstract

This paper provides an overview of a one-dimensional modelling methodology for equipment and systems for heat to power conversion based on a staggered grid space discretization and implemented in the commercial software GT-SUITE®. Particular attention is given to a newly developed modelling procedure for twin-screw machines that is based on a chamber modelling approach and considers leakage paths between cells and with the casing. This methodology is then applied to a low-grade heat to power conversion system based on a Trilateral Flash Cycle (TFC) equipped with two parallel two-phase twin-screw expanders and a control valve upstream of the machines to adapt the fluid quality for an optimal expander operation. The standalone expander model is used to generate performance maps of the machine, which serve as inputs for the TFC system model. Parametric analyses are eventually carried out to assess the impact of several operating parameters of the TFC unit on the recovered power and cycle thermal efficiency. The study shows that the most influencing factors on the TFC system’s performance are the inlet temperature of the heat source and the expander speed. While the first depends on the topping industrial process, the expander speed can be used to optimize and control the TFC system operation also in transient or off-design operating conditions. View Full-Text
Keywords: one-dimensional modelling; GT-SUITE®; energy conversion; positive displacement machine one-dimensional modelling; GT-SUITE®; energy conversion; positive displacement machine
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Bianchi, G.; Marchionni, M.; Kennedy, S.; Miller, J.; Tassou, S. One-Dimensional Modelling of a Trilateral Flash Cycle System with Two-Phase Twin-Screw Expanders for Industrial Low-Grade Heat to Power Conversion. Designs 2019, 3, 41.

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