Numerical and analytical study of a geo?exchange borehole using conventional grout and <scp>bentonite?based</scp> backfilling material

Ground source heat pumps (GSHP) have been used in various types of residential and commercial buildings due to their high efficiency. Numerical models are useful predict the overall performance ground temperature response these systems. This paper presents a hybrid model that contains modified finite element an analytical solution for single conventional vertical borehole system. In this model, turbulent transfer equations were solved exchanger actual building load variation pump considered. The present was then explore emerging geo-exchange technology, which involves use bentonite slurry enhanced with graphite flakes vicinity exchanger. results revealed slight increases mean average by 1.1°C over 4 years. Furthermore, good agreement obtained using within maximum relative error 3% (0.5°C). 40 m depth bentonite-based achieved better than design 5% 13% monthly COP.