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Analysis of working fluids applicable in Enhanced Geothermal Systems: nitrous oxide as an alternative working fluid

Analysis of working fluids applicable in Enhanced Geothermal Systems: nitrous oxide as an alternative working fluid
Analysis of working fluids applicable in Enhanced Geothermal Systems: nitrous oxide as an alternative working fluid
This document presents a study into the working fluids that can be used at an Enhanced Geothermal System (EGS) plant as a way of making efficient, large-scale use of the enormous resources offered by geothermal energy.

First, we investigate the two working fluids most used in such plants: water (H2O) and carbon dioxide (CO2). The comparative analysis brings to light the advantages of each one, making it possible to assess their beneficial properties. This leads us to establish what properties any alternative working fluid should have.

Then, we analyse fluids included in the database of the Engineering Equation Solver (EES) program. This entails a study of their thermodynamic properties in the working conditions established. Based on the properties of each alternative working fluid and the results obtained from the EES, we seek to determine which working fluid has the best performance.

Finally, the results obtained after the analysis leads us to conclude that single supercritical phase nitrous oxide seems to be an alternative to the two working fluids used to date.
0360-5442
150-161
Olasolo, P.
3dac0c12-ad91-493c-8eea-687b6b44e610
Juárez, M.c.
d42521bd-82ed-4153-b123-505ebf931bc1
Morales, M.p.
eb14be43-19c9-425e-a7cd-3b0df3fdbc11
Olasolo, A.
c2a7c70d-e86d-4d59-8052-1898863b1dd6
Agius, M.R.
cb168c8d-0926-4c0d-951c-721fb4cf1ebf
Olasolo, P.
3dac0c12-ad91-493c-8eea-687b6b44e610
Juárez, M.c.
d42521bd-82ed-4153-b123-505ebf931bc1
Morales, M.p.
eb14be43-19c9-425e-a7cd-3b0df3fdbc11
Olasolo, A.
c2a7c70d-e86d-4d59-8052-1898863b1dd6
Agius, M.R.
cb168c8d-0926-4c0d-951c-721fb4cf1ebf

Olasolo, P., Juárez, M.c., Morales, M.p., Olasolo, A. and Agius, M.R. (2018) Analysis of working fluids applicable in Enhanced Geothermal Systems: nitrous oxide as an alternative working fluid. Energy, 157, 150-161. (doi:10.1016/j.energy.2018.04.006).

Record type: Article

Abstract

This document presents a study into the working fluids that can be used at an Enhanced Geothermal System (EGS) plant as a way of making efficient, large-scale use of the enormous resources offered by geothermal energy.

First, we investigate the two working fluids most used in such plants: water (H2O) and carbon dioxide (CO2). The comparative analysis brings to light the advantages of each one, making it possible to assess their beneficial properties. This leads us to establish what properties any alternative working fluid should have.

Then, we analyse fluids included in the database of the Engineering Equation Solver (EES) program. This entails a study of their thermodynamic properties in the working conditions established. Based on the properties of each alternative working fluid and the results obtained from the EES, we seek to determine which working fluid has the best performance.

Finally, the results obtained after the analysis leads us to conclude that single supercritical phase nitrous oxide seems to be an alternative to the two working fluids used to date.

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More information

Accepted/In Press date: 2 April 2018
e-pub ahead of print date: 4 May 2018
Published date: 1 August 2018

Identifiers

Local EPrints ID: 423825
URI: http://eprints.soton.ac.uk/id/eprint/423825
ISSN: 0360-5442
PURE UUID: 8d195d1f-f0be-4ff3-868a-761540e4f554

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Date deposited: 02 Oct 2018 16:30
Last modified: 15 Mar 2024 21:43

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Contributors

Author: P. Olasolo
Author: M.c. Juárez
Author: M.p. Morales
Author: A. Olasolo
Author: M.R. Agius

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