Data for the article "A numerical study on performance efficiency of a low-temperature horizontal ground-source heat pump system".

In this study, a three-dimensional coupled thermal-hydraulic model with realistic boundary conditions is proposed, validated, and applied for evaluating a horizontal ground source heat pump (HGSHP) system to support the development of a 5th generation district heating and cooling (DHC) network on a potential site in the UK. Important influencing factors by a total of eight simulations are studied to assess the performance efficiency of the HGSHP system and the evolution of ground thermal behaviour in response to heat extraction or rejection into the ground. Two simulations (BL 1-A/B, PW1 and BL 1-A/B, PW2) were created to study the effect of moisture transport in the ground on the performance of the HGSHP system. Two simulations (BL 1-A/B and BL 2-A/B) were carried out to investigate the effect of building thermal load on the performance of the HGSHP system. Two simulations (BL 1-A/B, H=3.0m and BL 1-A/B, H=3.5m) were conducted to study the effect of buried depth on the performance of the HGSHP system. Two simulations (BL 1-A/B, GT1 and BL 1-A/B, GT2) were modelled to explore the effect of initial ground temperature on the performance of the HGSHP system. Data of the model validations based on an on-site heating experiment with a vertical borehole and a laboratory heating experiment with a horizontal ground heat exchanger are included. Data of the eight simulations' results with time, including ground temperature at the observation point P (0.52,-3.0,0), inlet fluid temperature, outlet fluid temperature, and heat pump COP, are listed.Research results based on these data are published at https://doi.org/10.1016/j.enbuild.2023.113137