Geothermal energy is a clean energy source which is being exploited in ground heat exchangers (GHE). GHE is of great interest to the community of researchers due to its advantages in offering a renewable and pollution free alternative. Although many research has been done on GHE but the use of nanoparticle in enhancing energy efficiency is novel. In the present work, the improvement towards the heat transfer and thermal performances of the triple helix ground heat exchanger (GHE) model is studied by mixing nanoparticles of different concentrations to the base fluid which is water. The numerical simulation of the present GHE model has been performed in Computational Fluid Dynamics software i.e. ANSYS FLUENT. The results show that the heat transfer and various other thermal performance characteristics such as outlet temperature of the water, rate of heat exchange, effectiveness, efficiency, and thermal resistance have been improved by the addition of nanoparticles in water. The heat transfer is increased by approximately 5 W, temperature difference is enhanced by 5 K and effectiveness is increased by 0.01 when compared to with 8 % nanoparticles and without addition of nanoparticles. It is also found that by increasing the concentration of nanoparticles from 2 to 8 % the thermal performance characteristics of triple-helical GHE are further improved.