1x100 m and 1x150 m BHEs were installed in Budapest IV. district in 2008 and we carried the Thermal Response Test out. The pipes were single U with 40mm diameter.
At first we measured the undisturbed in situ temperature in the BHE after drilling and after that the TRT was carried out. The inlet, outlet temperature, mass flow and air temperature were recorded. The result of evaluation was the thermal conductivity value.
Based on these tests we designed the BHE field.