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Qian Jiang
School of Energy Safety Engineering, Tianjin Chengjian University, Tianjin, China
Corresponding Author
ORCiD: https://orcid.org/0000-0001-8955-5499
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A borehole heat exchangers (BHEs) combined with pumping-injection well is established in areas where the groundwater is shallow and the seepage velocity is weak. The pumping and injection wells are set on both sides of the BHEs. According to the three-dimensional unsteady heat transfer model in aquifer, the convection-dispersion analytical solution of excess temperature is derived that considers groundwater forced seepage and thermal dispersion effects and axial effect of the BHEs. Then, the dimensional analysis method and similarity criteria we used to build a controllable forced seepage sandbox. The software FEFLOW 7.1 is adopted and the simulation results are validated by the theoretical analysis and the indoor experiment test. On this basis, the numerical simulation calculation is used to explore the influence of different pumping-injection flow volume on the Darcy flow velocity of the aquifer where the BHEs are located, the average heat transfer efficiency and the heat transfer rates with borehole depth. The results show that when the pumping flow volume increases from 200 m3∙d-1 to 1200 m3∙d-1, the Darcy velocity correspondingly increases to about 10 times. The average heat efficiency coefficient of the BHEs is increased by 11.5% in cooling stage, and by 7.5% in heating stage. When the pumping-injection flow volume is 400~600 m3∙d-1, the increment of heat transfer rates of the BHEs reaches 12.8~17.9 W∙m-1 and 3.6~4.2 W∙m-1 per unit of borehole depth during the cooling stage and heating stage respectively, and then decreases as the flow volume increases gradually.
Keywords
borehole heat exchangers, groundwater forced seepage, analytical solution, laboratory experiment, numerical simulation calculation, pumping-injection well
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View the published article at Geothermal Energy.
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Editorial decision: Major revision
On 26 Oct, 2020
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Received 22 Oct, 2020
Review #1 received
Received 25 Sep, 2020
Reviewer #2 agreed
On 21 Sep, 2020
Reviewers invited
Invitations sent on 17 Sep, 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
Qian Jiang
School of Energy Safety Engineering, Tianjin Chengjian University, Tianjin, China
Corresponding Author
ORCiD: https://orcid.org/0000-0001-8955-5499
Badges
Prescreen
This manuscript passed our Prescreen assessment
Complete author information
Appropriate declaration statements
Potential risks to human health
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Peer Review Timeline
CURRENT STATUS: Published
View the published article at Geothermal Energy.
Version (no preprint)
Posted 01 Feb, 2021
Editorial decision: Minor revision
On 01 Feb, 2021
Review #1 received
Received 28 Jan, 2021
Reviewer #1 agreed
On 24 Jan, 2021
Reviewers invited
Invitations sent on 23 Jan, 2021
Editor assigned
On 21 Jan, 2021
Submission checks complete
On 21 Jan, 2021
Editor invited
On 21 Jan, 2021
First submitted
On 21 Jan, 2021
This version was not preprinted
Version 3
Posted 29 Jan, 2021
No community comments so far
Editor assigned
On 21 Jan, 2021
Submission checks complete
On 21 Jan, 2021
Editor invited
On 21 Jan, 2021
No comments provided
Editorial decision: Minor revision
On 03 Jan, 2021
Editor assigned
On 01 Dec, 2020
Submission checks complete
On 01 Dec, 2020
Editor invited
On 01 Dec, 2020
No comments provided
Editorial decision: Major revision
On 26 Oct, 2020
Review #2 received
Received 22 Oct, 2020
Review #1 received
Received 25 Sep, 2020
Reviewer #2 agreed
On 21 Sep, 2020
Reviewers invited
Invitations sent on 17 Sep, 2020
Reviewer #1 agreed
On 17 Sep, 2020
Editor assigned
On 03 Aug, 2020
Submission checks complete
On 02 Aug, 2020
Editor invited
On 02 Aug, 2020
First submitted
On 01 Aug, 2020
Metrics
Comments: 0
PDF Downloads: ...
HTML Views: ...
Subject Areas
Food Science & Technology
License:
This work is licensed under a CC BY 4.0 License. Read Full License
View the published article at Geothermal Energy.
A borehole heat exchangers (BHEs) combined with pumping-injection well is established in areas where the groundwater is shallow and the seepage velocity is weak. The pumping and injection wells are set on both sides of the BHEs. According to the three-dimensional unsteady heat transfer model in aquifer, the convection-dispersion analytical solution of excess temperature is derived that considers groundwater forced seepage and thermal dispersion effects and axial effect of the BHEs. Then, the dimensional analysis method and similarity criteria we used to build a controllable forced seepage sandbox. The software FEFLOW 7.1 is adopted and the simulation results are validated by the theoretical analysis and the indoor experiment test. On this basis, the numerical simulation calculation is used to explore the influence of different pumping-injection flow volume on the Darcy flow velocity of the aquifer where the BHEs are located, the average heat transfer efficiency and the heat transfer rates with borehole depth. The results show that when the pumping flow volume increases from 200 m3∙d-1 to 1200 m3∙d-1, the Darcy velocity correspondingly increases to about 10 times. The average heat efficiency coefficient of the BHEs is increased by 11.5% in cooling stage, and by 7.5% in heating stage. When the pumping-injection flow volume is 400~600 m3∙d-1, the increment of heat transfer rates of the BHEs reaches 12.8~17.9 W∙m-1 and 3.6~4.2 W∙m-1 per unit of borehole depth during the cooling stage and heating stage respectively, and then decreases as the flow volume increases gradually.
Figure 2
Figure 3
Figure 4
Figure 5
Figure 6
Figure 7
Figure 8
Figure 9
Figure 10
Figure 11
Figure 12
Figure 13
Figure 14
Figure 15
The full text of this article is available to read as a PDF.
This is a list of supplementary files associated with this preprint. Click to download.
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