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 …

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 …