Mean measured groundwater temperature based on surveys.

The intrinsic ability of hard rock samples to conduct heat.

Maximum yield or pumping rate of a groundwater well doublet per square meter at a given location.

Annual maximum groundwater temperature.

The intrinsic ability of unconsolidated sediment to conduct heat.

Thermal response test (TRT) is the customary method to determine ground thermal conductivity in situ.

Specific annual thermal energy content for heating and / or cooling referring per surface area for borehole heat exchangers at a defined length.

The maximum temperature shift between the production and the injection well that is possible with regards to legal or ecological limitations.

Measured effective average interval thermal conductivity also accounting for advective heat transport caused by groundwater. The data is obtained from Thermal Response Tests.

Annual minimum groundwater temperature.