| Peer-Reviewed

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

Received: 22 September 2018     Accepted: 10 October 2018     Published: 30 October 2018
Views:       Downloads:
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
[1] GAO, Liuhua; ZHAO, Jun; TANG, Zipeng. A review on borehole seasonal solar thermal energy storage. Energy procedia, 2015, vol. 70, p. 209-218.
[2] GUADALFAJARA, M.; LOZANO, M. A.; SERRA, L. M. Simple calculation tool for central solar heating plants with seasonal storage. Solar Energy, 2015, vol. 120, p. 72-86.
[3] ZHU, Neng; WANG, Jingmei; LIU, Long. Performance evaluation before and after solar seasonal storage coupled with ground source heat pump. Energy Conversion and Management, 2015, vol. 103, p. 924-933.
[4] Sibbet, B., and D. McClenahan. "Seasonal Borehole Thermal Energy Storage—Guidelines for Design & Construction." Natural Resources: Hvalsoe, Denmark (2015).
[5] Kavanaugh, Stephen P., and Kevin D. Rafferty. Geothermal heating and cooling: design of ground-source heat pump systems. ASHRAE, 2014.
[6] Thompson III, Willis Hope. Numerical Analysis of Thermal Behavior and Fluid Flow in Geothermal Energy Piles. Diss. Virginia Tech, 2013.
[7] Javed, Saqib. Thermal modelling and evaluation of borehole heat transfer. Chalmers University of Technology, 2012.
[8] Weiss, Werner. Solar heating systems for houses: a design handbook for solar combisystems. Routledge, 2003.
[9] TAO, Tao, et al. Low cost and marketable operational experiences for a solar heating system with seasonal thermal energy storage (SHSSTES) in Hebei (China). Energy Procedia, 2015, vol. 70, p. 267-274.
[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.
[12] Xu, Q. and Dubljevic, S., 2017. Modelling and control of solar thermal system with borehole seasonal storage. Renewable Energy, 100, pp. 114-128.
[13] Rad, F. M., Fung, A. S. and Rosen, M. A., 2017. An integrated model for designing a solar community heating system with borehole thermal storage. Energy for Sustainable Development, 36, pp. 6-15.
[14] Cecinato, F. and Loveridge, F. A., 2015. Influences on the thermal efficiency of energy piles. Energy, 82, pp. 1021-1033.
[15] Bidarmaghz, A., G. Narsilio, and I. Johnston. "Numerical modelling of ground heat exchangers with different ground loop configurations for direct geothermal applications." In Proceedings of the 18th International Conference on Soil Mechanics and Geotechnical Engineering, Paris, France, pp. 2-6. 2013.
[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.
[17] Chapuis, Simon, and Michel Bernier. "Seasonal storage of solar energy in borehole heat exchangers." (2009).
[18] Bezyan, B., Porkhial, S. and Mehrizi, A. A., 2015. 3-D simulation of heat transfer rate in geothermal pile-foundation heat exchangers with spiral pipe configuration. Applied Thermal Engineering, 87, pp. 655-668.
[19] Miyara, A., 2012. Thermal performance investigation of several types of vertical ground heat exchangers with different operation mode. Applied Thermal Engineering, 33, pp. 167-174.
[20] Madani, H., Claesson, J. and Lundqvist, P., 2011. Capacity control in ground source heat pump systems: Part I: modeling and simulation. International Journal of Refrigeration, 34(6), pp. 1338-1347.
Cite This Article
  • 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

    Copy | Download

    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

    Copy | Download

    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

    Copy | Download

  • @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}
    }
    

    Copy | Download

  • 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  - 

    Copy | Download

Author Information
  • College of Mechanical and Electrical Engineering, Hohai University, Changzhou, China

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

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

  • Sections