Results from both experimental measurements and 3D numerical simulations of Ground Source Heat Pump systems (GSHP) at a UK climate are presented. Experimental measurements of a horizontal coupled slinky GSHP were undertaken in Talbot Cottage at Drayton St Leonard site, Oxford shire, UK. The measured thermophysical properties of in-situ soil were used in the Computational Fluid Dynamics (CFD) model. The thermal performance of slinky heat exchangers for the horizontal coupled GSHP system for different coil diameters and slinky interval distances was investigated using a validated 3D model. The numerical prediction showed that there was no significant difference in the specific heat extraction of the slinky heat exchanger at different coil diameters. However, the larger the diameter of coil, the higher the heat extraction per meter length of soil. The specific heat extraction also increased but the heat extraction per meter length of soil decreased with the increase of coil central interval distance.
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