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This study introduces a new model for simulating borehole geothermal systems, coupling local heat transfer in borehole heat exchangers with field-scale heat transport. The model accurately predicts thermal changes and evaluates ground source heat pump efficiency.

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Area of Science:

  • Geothermal Energy Engineering
  • Environmental Engineering
  • Numerical Modeling

Background:

  • Borehole heat exchangers (BHEs) are crucial for ground source heat pump systems.
  • Accurate simulation of thermal transport in BHEs and surrounding soil is essential for system efficiency.
  • Existing models often lack integrated dynamic simulation capabilities for field-scale applications.

Purpose of the Study:

  • To develop and validate a novel integrated two-region model for dynamic simulation of borehole geothermal systems.
  • To couple local heat transfer in BHEs with field-scale heat transport.
  • To predict subsurface thermal perturbation and evaluate ground source heat pump efficiency.

Main Methods:

  • Developed a two-region model integrating local BHE heat transfer with field-scale heat transport using MT3DMS.
  • Created new Python modules for analytical solutions of borehole thermal processes and iterative interfacing with MT3DMS.
  • Utilized the Flopy Python package to script the MODFLOW-based MT3DMS numerical model.

Main Results:

  • Successfully predicted subsurface thermal perturbation induced by BHEs.
  • Derived U-pipe circulating fluid temperature profiles within boreholes.
  • Evaluated ground source heat pump efficiency based on building heat load time series.
  • Validated the model against analytical solutions and demonstrated its application to complex scenarios.

Conclusions:

  • The integrated two-region model provides a robust tool for dynamic simulation of borehole geothermal systems.
  • The model enables accurate prediction of thermal behavior and performance evaluation of ground source heat pumps.
  • The developed approach facilitates the design and optimization of geothermal energy systems.