TY - JOUR N2 - The main task of mathematical modelling of thermal and flow processes in vertical ground heat exchanger (BHE-Borehole Heat Exchanger) is to determine the unit of borehole depth heat flux obtainable or transferred during the operation of the installation. This assignment is indirectly associated with finding the circulating fluid temperature flowing out from the U-tube at a given inlet temperature of fluid in respect to other operational parameters of the installation. The paper presents a model of thermal and flow processes in BHE consisting of two analytical models separately-handling processes occurring inside and outside of borehole. A quasi-three-dimensional model formulated by Zeng was used for modelling processes taking place inside the borehole and allowing to determine the temperature of the fluid in the U-tube along the axis of BHE. For modelling processes occurring outside the borehole a model that uses the theory of linear heat source was selected. The coupling parameters for the models are the temperature of the sealing material on the outer wall of the borehole and the average heat flow rate in BHE. Experimental verification of the proposed model was shown in relation to BHE cooperating with a heat pump in real conditions. L1 - http://www.czasopisma.pan.pl/Content/105895/PDF/03-paper-Pater-Ciesielczyk.pdf L2 - http://www.czasopisma.pan.pl/Content/105895 PY - 2017 IS - No 4 EP - 533 DO - 10.1515/cpe-2017-0041 KW - vertical ground heat exchanger KW - borehole KW - geothermal heat pumps KW - thermal and flow processes A1 - Pater, Sebastian A1 - Ciesielczyk, Włodzimierz PB - Polish Academy of Sciences Committee of Chemical and Process Engineering VL - vol. 38 DA - 2017.12.15 T1 - Mathematical modelling of thermal and flow processes in vertical ground heat exchangers SP - 523 UR - http://www.czasopisma.pan.pl/dlibra/publication/edition/105895 T2 - Chemical and Process Engineering ER -