Ground Source Heat Exchanger Systems (GSHES) are commonplace throughout the world. Many parameters influence the behavior of GSHES. These parameters could be listed as; the thermal conductivity of the formation, the velocity of the underground water flow, the inlet temperature and etc. Mathematical models used in the modeling of GSHE performance are well established. These models usually account for the conductive heat transfer into the strata and the convective heat transfer within the tubes the fluids flow. Underground convective flows could affect the behavior of GSHES significantly. A numerical model is developed in this study for the purpose of analyzing the effects of underground water flow and various other parameters on the performance of GSHES. The model is based on solving the energy balance equation only. The energy balance considered has three main components; an accumulation term, a conductive term and a convective term. Steady state flow of fluid in the underground and in the tubes is assumed, which allows for solving only the energy balance equation. The model is verified with existing analytical and numerical solutions. The model is then used to study the effects of various parameters on the performance of GSHES.

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