In this paper different approaches to groundwater flow and its effect in the vicinity of a borehole ground heat … exchanger are discussed. The common assumption that groundwater flow in hard rock may be modelled as a homogeneous flow in a … medium with an effective porosity is confronted and models for heat transfer due to groundwater flow in fractures and …

A modified three-dimensional finite difference model for the borehole ground heat exchangers of a ground-source heat … borefield at no groundwater flow. The present model was used to investigate the impact of ignoring ground layers in the thermal …

most ground-coupled heat pump environments with the exception of geological settings where there is significant groundwater … numerical groundwater flow and heat transfer model. The input temperature signal is specified at the entrance of the ground heat …

inhomogeneous groundwater flow in the soil. The model was validated using FLUENT for a single borehole based on a constant load … the groundwater table on the performance of the BHE. It was found that with the borehole partially-submerged in … groundwater flow, the borehole specific load along the borehole depth became stratified, the extent of which depended on the …

Computer simulation of borehole ground heat exchangers used in geothermal heat pump systems was conducted using three …-dimensional implicit finite difference method with rectangular coordinate system. Each borehole was approximated by a square column … circumscribed by the borehole radius. Borehole loading profile calculated numerically based on the prescribed borehole temperature …

The objective of this study is to show the temperature distribution development in the borehole of the ground … was placed in a vertical borehole (VB) with 30 (VB1), 60 (VB2) and 90 (VB3)m depths and 150mm diameters. The experimental …

Ground source heat pump systems are often coupled to the ground by circulating a fluid through vertical Borehole Heat … Exchangers (BHEs). The design of a system requires estimates of the ground thermal conductivity and the borehole thermal … resistance, which are usually determined by an in situ thermal response test on a completed borehole. The usual test …

A conventional thermal response test (TRT) provides a bulk estimate of the subsurface and borehole thermal properties … over the length of the ground heat exchanger (GHE). The measurement of temperature inside the borehole during a TRT can be … subsurface thermal conductivity and the borehole thermal resistance was within 20% of the expected values, except when the …