). Multiple ground layers with regard to GHE and the presence of more than one loops in each borehole (multiple U-tubes) are … study of a double U-tube GHE in a single borehole and the assessment of its efficiency with regard to its building cost … developed for energy flows and temperature changes in and around a borehole, when a fluid circulates through single and double U …

A numerical model has been developed to study the complex thermal behavior of a CO2-filled vertical geothermal borehole …-state conservation equations of mass, momentum and energy is applied. The borehole is divided into small volume elements due to … relatively significant changes in the thermophysical properties of the fluid. Borehole wall temperature variations as well as …

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 …

In this paper an improvement of the model CaRM (CApacity Resistance Model) is presented to consider the borehole … thermal capacitance, both of the filling material of the borehole and of the heat carrier fluid inside the ground heat …-coupled heat pump systems. According to the modelling for the surrounding ground, the new approach for the inside of the borehole …

needed during design: both the borehole and the surrounding ground are affected by thermal exchange. The model here presented …-tube or coaxial pipes. Besides, ground temperature at different distances from borehole are calculated, taking into account …

A modified model for a borehole ground heat exchanger borefield (BHE) of a ground-source heat pump (GSHP) system was … inhomogeneous groundwater flow in the soil. The model was validated using FLUENT for a single borehole based on a constant load … along the effective length of the borehole with good agreement. The present model was then used to investigate the effect of …

properties. A ground loop consisted of a rectangular field of 15 borehole heat exchangers is utilized to cover building loads …. GLD 2009 sizing software calculates borehole length setting two different fixed temperatures for the heat carrier fluid …

A modified three-dimensional finite difference model for the borehole ground heat exchangers of a ground-source heat …