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Hannah Rose Doran
University of Glasgow
Corresponding Author
ORCiD: https://orcid.org/0000-0002-0368-4992
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Alternative (unconventional) deep geothermal designs are needed to provide a secure and efficient geothermal energy supply. An in-depth sensitivity analysis was investigated considering a deep borehole closed-loop heat exchanger (DBHE) to overcome the current limitations of deep EGS. A T2Well/EOS1 model previously calibrated on an experimental DBHE in Hawaii was adapted to the current NWG 55-29 well at the Newberry volcano site in Central Oregon. A sensitivity analysis was carried out, including parameters such as: the working fluid mass flow rate, the casing and cement thermal properties and the wellbore radii dimensions. The results conclude the highest energy flow rate to be 1.5MW, after an annulus radii increase and an imposed mass flow rate of 5kg/. At 3kg/s, the DBHE yielded an energy flow rate a factor of 3.5 lower than the NWG 55-29 conventional design. Despite this loss, the sensitivity analysis allows an assessment of the key thermodynamics within the wellbore and provide a valuable insight into how heat is lost/gained throughout the system. This analysis was performed under the assumption of subcritical conditions, and could aid the development of unconventional designs within future EGS work like the Newberry Deep Drilling Project (NDDP). Requirements for further software development are briefly discussed, which would facilitate the modelling of unconventional geothermal wells in supercritical systems to support EGS projects that could extend to deeper depths.
Keywords
Closed-loop deep borehole heat exchanger, EGS, NDDP, T2Well, EOS1
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View the published article at Geothermal Energy.
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On 13 Jan, 2021
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On 08 Jan, 2021
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On 08 Jan, 2021
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On 08 Jan, 2021
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Review #2 received
Received 10 Dec, 2020
Editorial decision: Minor revision
On 10 Dec, 2020
Reviewer #2 agreed
On 28 Nov, 2020
Review #1 received
Received 26 Nov, 2020
Reviewers invited
Invitations sent on 24 Nov, 2020
Reviewer #1 agreed
On 24 Nov, 2020
Editor assigned
On 27 Oct, 2020
Submission checks complete
On 26 Oct, 2020
Editor invited
On 26 Oct, 2020
No comments provided
Editorial decision: Major revision
On 15 Sep, 2020
Review #3 received
Received 10 Sep, 2020
Reviewer #3 agreed
On 22 Aug, 2020
Review #2 received
Received 27 Jul, 2020
Reviewer #2 agreed
On 13 Jul, 2020
Review #1 received
Received 29 Jun, 2020
Reviewer #1 agreed
On 22 Jun, 2020
Reviewers invited
Invitations sent on 10 Jun, 2020
Editor assigned
On 08 Jun, 2020
First submitted
On 07 Jun, 2020
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On 07 Jun, 2020
Editor invited
On 07 Jun, 2020
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See the published version of this preprint at Geothermal Energy.
This is a preprint, a preliminary version of a manuscript that has not completed peer review at a journal. Research Square does not conduct peer review prior to posting preprints. The posting of a preprint on this server should not be interpreted as an endorsement of its validity or suitability for dissemination as established information or for guiding clinical practice.
Learn more about In Review
Research
Hannah Rose Doran
University of Glasgow
Corresponding Author
ORCiD: https://orcid.org/0000-0002-0368-4992
Badges
Prescreen
This manuscript passed our Prescreen assessment
Complete author information
Appropriate declaration statements
Potential risks to human health
Prescreen
Peer Review Timeline
CURRENT STATUS: Published
View the published article at Geothermal Energy.
Version 3
Posted 18 Jan, 2021
No community comments so far
Editorial decision: Accept
On 13 Jan, 2021
Editor assigned
On 08 Jan, 2021
Submission checks complete
On 08 Jan, 2021
Editor invited
On 08 Jan, 2021
No comments provided
Review #2 received
Received 10 Dec, 2020
Editorial decision: Minor revision
On 10 Dec, 2020
Reviewer #2 agreed
On 28 Nov, 2020
Review #1 received
Received 26 Nov, 2020
Reviewers invited
Invitations sent on 24 Nov, 2020
Reviewer #1 agreed
On 24 Nov, 2020
Editor assigned
On 27 Oct, 2020
Submission checks complete
On 26 Oct, 2020
Editor invited
On 26 Oct, 2020
No comments provided
Editorial decision: Major revision
On 15 Sep, 2020
Review #3 received
Received 10 Sep, 2020
Reviewer #3 agreed
On 22 Aug, 2020
Review #2 received
Received 27 Jul, 2020
Reviewer #2 agreed
On 13 Jul, 2020
Review #1 received
Received 29 Jun, 2020
Reviewer #1 agreed
On 22 Jun, 2020
Reviewers invited
Invitations sent on 10 Jun, 2020
Editor assigned
On 08 Jun, 2020
First submitted
On 07 Jun, 2020
Submission checks complete
On 07 Jun, 2020
Editor invited
On 07 Jun, 2020
Metrics
Comments: 0
PDF Downloads: ...
HTML Views: ...
Subject Areas
Renewable Resources
License:
This work is licensed under a CC BY 4.0 License. Read Full License
View the published article at Geothermal Energy.
Alternative (unconventional) deep geothermal designs are needed to provide a secure and efficient geothermal energy supply. An in-depth sensitivity analysis was investigated considering a deep borehole closed-loop heat exchanger (DBHE) to overcome the current limitations of deep EGS. A T2Well/EOS1 model previously calibrated on an experimental DBHE in Hawaii was adapted to the current NWG 55-29 well at the Newberry volcano site in Central Oregon. A sensitivity analysis was carried out, including parameters such as: the working fluid mass flow rate, the casing and cement thermal properties and the wellbore radii dimensions. The results conclude the highest energy flow rate to be 1.5MW, after an annulus radii increase and an imposed mass flow rate of 5kg/. At 3kg/s, the DBHE yielded an energy flow rate a factor of 3.5 lower than the NWG 55-29 conventional design. Despite this loss, the sensitivity analysis allows an assessment of the key thermodynamics within the wellbore and provide a valuable insight into how heat is lost/gained throughout the system. This analysis was performed under the assumption of subcritical conditions, and could aid the development of unconventional designs within future EGS work like the Newberry Deep Drilling Project (NDDP). Requirements for further software development are briefly discussed, which would facilitate the modelling of unconventional geothermal wells in supercritical systems to support EGS projects that could extend to deeper depths.
Figure 1
Figure 2
Figure 3
Figure 4
Figure 5
Figure 6
Figure 7
Figure 8
Figure 9
Figure 10
Figure 11
This preprint is available for download as a PDF.
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