The Effectiveness of Borehole Heat Exchanger Depth on Heat Transfer Rate, Study with Numerical Method Using a CFD 3D Simulation

Ebrahim Mohammed; Wei Liu; Waleed Karrar

doi:doi:10.11648/j.ajai.20180202.12

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The Effectiveness of Borehole Heat Exchanger Depth on Heat Transfer Rate, Study with Numerical Method Using a CFD 3D Simulation

Ebrahim Mohammed, Wei Liu, Waleed Karrar

Published in American Journal of Artificial Intelligence (Volume 2, Issue 2)

Received: 22 September 2018 Accepted: 10 October 2018 Published: 30 October 2018

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Abstract

Excess solar thermal energy is available, while in winter, when thermal energy is needed for heating systems, its quantity is usually not sufficient. There are different options to cope with the seasonal offset of thermal energy supply and demand. One of these options is borehole thermal energy storages (BTES). Borehole thermal energy storages coupled with ground source heat pumps have been widely developed and researched. The major disadvantage of (BTES) is the initial capital cost required to drill the boreholes. Geothermal energy piles were developed to help offset the high initial cost of these systems. This study investigates thermal performance of vertical ground heat exchangers with constant inlet water temperatures and deferent borehole depths. The performances of three models of U-tube with depth of 100m, 60m, and 30m are evaluated by numerical method using a CFD 3D simulation. The simulation results show that heat transfer rates decrease in the heating mode for 100m depth, and show that the best borehole depth regarding to heat transfer rate efficiency is 60m depth borehole. However for heat storage capacity the model of 100m depth is the best. The results show that increasing the depth of borehole heat exchangers lower the heat exchange efficiency with the ground. By comparing with 100 m depth, the heat transfer rates per unit borehole depth lower of 3.1% in 60 m depth. According to all results, it is highly recommended to construct medium depth around 60 m depth of borehole with U-shaped pipe configuration, due to higher efficiency in heat transfer rate.

Published in	American Journal of Artificial Intelligence (Volume 2, Issue 2)
DOI	10.11648/j.ajai.20180202.12
Page(s)	22-29
Creative Commons	This is an Open Access article, distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution and reproduction in any medium or format, provided the original work is properly cited.
Copyright	Copyright © The Author(s), 2018. Published by Science Publishing Group

Keywords

Heat Transfer Rate, Different Borehole Depths, Numerical Method, CFD 3-D Simulation

References

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[10]	Ur Rehman, H., Hirvonen, J. and Sirén, K., 2016. Design of a simple control strategy for a community-size solar heating system with a seasonal storage. Energy Procedia, 91, pp. 486-495.
[11]	Osorio, J. D., Hovsapian, R. and Ordonez, J. C., 2016. Effect of multi-tank thermal energy storage, recuperator effectiveness, and solar receiver conductance on the performance of a concentrated solar supercritical CO2-based power plant operating under different seasonal conditions. Energy, 115, pp. 353-368.
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[16]	Bär, K., Rühaak, W., Welsch, B., Schulte, D., Homuth, S. and Sass, I., 2015. Seasonal high temperature heat storage with medium deep borehole heat exchangers. Energy Procedia, 76, pp. 351-360.
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APA Style

Ebrahim Mohammed, Wei Liu, Waleed Karrar. (2018). The Effectiveness of Borehole Heat Exchanger Depth on Heat Transfer Rate, Study with Numerical Method Using a CFD 3D Simulation. American Journal of Artificial Intelligence, 2(2), 22-29. https://doi.org/10.11648/j.ajai.20180202.12

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ACS Style

Ebrahim Mohammed; Wei Liu; Waleed Karrar. The Effectiveness of Borehole Heat Exchanger Depth on Heat Transfer Rate, Study with Numerical Method Using a CFD 3D Simulation. Am. J. Artif. Intell. 2018, 2(2), 22-29. doi: 10.11648/j.ajai.20180202.12

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AMA Style

Ebrahim Mohammed, Wei Liu, Waleed Karrar. The Effectiveness of Borehole Heat Exchanger Depth on Heat Transfer Rate, Study with Numerical Method Using a CFD 3D Simulation. Am J Artif Intell. 2018;2(2):22-29. doi: 10.11648/j.ajai.20180202.12

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@article{10.11648/j.ajai.20180202.12,
  author = {Ebrahim Mohammed and Wei Liu and Waleed Karrar},
  title = {The Effectiveness of Borehole Heat Exchanger Depth on Heat Transfer Rate, Study with Numerical Method Using a CFD 3D Simulation},
  journal = {American Journal of Artificial Intelligence},
  volume = {2},
  number = {2},
  pages = {22-29},
  doi = {10.11648/j.ajai.20180202.12},
  url = {https://doi.org/10.11648/j.ajai.20180202.12},
  eprint = {https://article.sciencepublishinggroup.com/pdf/10.11648.j.ajai.20180202.12},
  abstract = {Excess solar thermal energy is available, while in winter, when thermal energy is needed for heating systems, its quantity is usually not sufficient. There are different options to cope with the seasonal offset of thermal energy supply and demand. One of these options is borehole thermal energy storages (BTES). Borehole thermal energy storages coupled with ground source heat pumps have been widely developed and researched. The major disadvantage of (BTES) is the initial capital cost required to drill the boreholes. Geothermal energy piles were developed to help offset the high initial cost of these systems. This study investigates thermal performance of vertical ground heat exchangers with constant inlet water temperatures and deferent borehole depths. The performances of three models of U-tube with depth of 100m, 60m, and 30m are evaluated by numerical method using a CFD 3D simulation. The simulation results show that heat transfer rates decrease in the heating mode for 100m depth, and show that the best borehole depth regarding to heat transfer rate efficiency is 60m depth borehole. However for heat storage capacity the model of 100m depth is the best. The results show that increasing the depth of borehole heat exchangers lower the heat exchange efficiency with the ground. By comparing with 100 m depth, the heat transfer rates per unit borehole depth lower of 3.1% in 60 m depth. According to all results, it is highly recommended to construct medium depth around 60 m depth of borehole with U-shaped pipe configuration, due to higher efficiency in heat transfer rate.},
 year = {2018}
}

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TY - JOUR
T1 - The Effectiveness of Borehole Heat Exchanger Depth on Heat Transfer Rate, Study with Numerical Method Using a CFD 3D Simulation
AU - Ebrahim Mohammed
AU - Wei Liu
AU - Waleed Karrar
Y1 - 2018/10/30
PY - 2018
N1 - https://doi.org/10.11648/j.ajai.20180202.12
DO - 10.11648/j.ajai.20180202.12
T2 - American Journal of Artificial Intelligence
JF - American Journal of Artificial Intelligence
JO - American Journal of Artificial Intelligence
SP - 22
EP - 29
PB - Science Publishing Group
SN - 2639-9733
UR - https://doi.org/10.11648/j.ajai.20180202.12
AB - Excess solar thermal energy is available, while in winter, when thermal energy is needed for heating systems, its quantity is usually not sufficient. There are different options to cope with the seasonal offset of thermal energy supply and demand. One of these options is borehole thermal energy storages (BTES). Borehole thermal energy storages coupled with ground source heat pumps have been widely developed and researched. The major disadvantage of (BTES) is the initial capital cost required to drill the boreholes. Geothermal energy piles were developed to help offset the high initial cost of these systems. This study investigates thermal performance of vertical ground heat exchangers with constant inlet water temperatures and deferent borehole depths. The performances of three models of U-tube with depth of 100m, 60m, and 30m are evaluated by numerical method using a CFD 3D simulation. The simulation results show that heat transfer rates decrease in the heating mode for 100m depth, and show that the best borehole depth regarding to heat transfer rate efficiency is 60m depth borehole. However for heat storage capacity the model of 100m depth is the best. The results show that increasing the depth of borehole heat exchangers lower the heat exchange efficiency with the ground. By comparing with 100 m depth, the heat transfer rates per unit borehole depth lower of 3.1% in 60 m depth. According to all results, it is highly recommended to construct medium depth around 60 m depth of borehole with U-shaped pipe configuration, due to higher efficiency in heat transfer rate.
VL - 2
IS - 2
ER -

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Author Information

Ebrahim Mohammed

College of Mechanical and Electrical Engineering, Hohai University, Changzhou, China
Wei Liu

College of Mechanical and Electrical Engineering, Hohai University, Changzhou, China
Waleed Karrar

College of Mechanical and Electrical Engineering, Hohai University, Changzhou, China

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APA Style

Ebrahim Mohammed, Wei Liu, Waleed Karrar. (2018). The Effectiveness of Borehole Heat Exchanger Depth on Heat Transfer Rate, Study with Numerical Method Using a CFD 3D Simulation. American Journal of Artificial Intelligence, 2(2), 22-29. https://doi.org/10.11648/j.ajai.20180202.12

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ACS Style

Ebrahim Mohammed; Wei Liu; Waleed Karrar. The Effectiveness of Borehole Heat Exchanger Depth on Heat Transfer Rate, Study with Numerical Method Using a CFD 3D Simulation. Am. J. Artif. Intell. 2018, 2(2), 22-29. doi: 10.11648/j.ajai.20180202.12

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AMA Style

Ebrahim Mohammed, Wei Liu, Waleed Karrar. The Effectiveness of Borehole Heat Exchanger Depth on Heat Transfer Rate, Study with Numerical Method Using a CFD 3D Simulation. Am J Artif Intell. 2018;2(2):22-29. doi: 10.11648/j.ajai.20180202.12

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@article{10.11648/j.ajai.20180202.12,
  author = {Ebrahim Mohammed and Wei Liu and Waleed Karrar},
  title = {The Effectiveness of Borehole Heat Exchanger Depth on Heat Transfer Rate, Study with Numerical Method Using a CFD 3D Simulation},
  journal = {American Journal of Artificial Intelligence},
  volume = {2},
  number = {2},
  pages = {22-29},
  doi = {10.11648/j.ajai.20180202.12},
  url = {https://doi.org/10.11648/j.ajai.20180202.12},
  eprint = {https://article.sciencepublishinggroup.com/pdf/10.11648.j.ajai.20180202.12},
  abstract = {Excess solar thermal energy is available, while in winter, when thermal energy is needed for heating systems, its quantity is usually not sufficient. There are different options to cope with the seasonal offset of thermal energy supply and demand. One of these options is borehole thermal energy storages (BTES). Borehole thermal energy storages coupled with ground source heat pumps have been widely developed and researched. The major disadvantage of (BTES) is the initial capital cost required to drill the boreholes. Geothermal energy piles were developed to help offset the high initial cost of these systems. This study investigates thermal performance of vertical ground heat exchangers with constant inlet water temperatures and deferent borehole depths. The performances of three models of U-tube with depth of 100m, 60m, and 30m are evaluated by numerical method using a CFD 3D simulation. The simulation results show that heat transfer rates decrease in the heating mode for 100m depth, and show that the best borehole depth regarding to heat transfer rate efficiency is 60m depth borehole. However for heat storage capacity the model of 100m depth is the best. The results show that increasing the depth of borehole heat exchangers lower the heat exchange efficiency with the ground. By comparing with 100 m depth, the heat transfer rates per unit borehole depth lower of 3.1% in 60 m depth. According to all results, it is highly recommended to construct medium depth around 60 m depth of borehole with U-shaped pipe configuration, due to higher efficiency in heat transfer rate.},
 year = {2018}
}

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