Validation of a Simplified Model to Determine the Long-Term Performance of Borehole Heat Exchanger Fields With Groundwater AdvectionS. Lazzari, A. Priarone, and E. Zanchini
University of Bologna, Department DIENCA, Bologna, Italy
University of Genova, Department DIPTEM, Genova, Italy
Finite element simulations performed through COMSOL Multiphysics are used to study the long-term performance of BHE fields placed in a water-saturated porous soil subjected to groundwater movement. The heat transfer problem is written in a dimensionless form and the long-term time evolution of the mean surface temperature of the BHEs, sketched as cylindrical heat sources subjected to a regular time periodic heat load, is determined with reference to a single line of three BHEs and to a square field of twenty-five BHEs.
A simplified model to determine the long-term performance of BHE fields, based on the superposition principle, is proposed and validated. The accuracy of the simplified model is found to be excellent for design purposes
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