A modified multi-ground-layer model for borehole ground heat exchangers with an inhomogeneous groundwater flow

▸ New borehole model was developed which accounted for inhomogeneous groundwater flow. ▸ The new model was validated using FLUENT with a uniform borehole specific load. ▸ Actual borehole specific load became stratified with inhomogeneous groundwater flow. ▸ The groundwater table affected the borehole thermal resistance. ▸ The use of an effective groundwater flow velocity could produce erroneous results.