DIN EN ISO 17628:2015-12

This standard specifies requirements for the Geothermal Response Test. This test comprises the in situ determination of the thermal conductivity in saturated and unsaturated soil and rock in a heat exchanger installed in a borehole. For this test liquid heat transfer media not subjected to phase changes are used. The thermal conductivity is an important parameter used in the design of thermal storage and thermal exchange systems. A Geothermal Response Test measures the temperature response to a thermal energy forcing of a borehole heat exchanger. The temperature response is related to the ground and borehole thermal parameters such as thermal conductivity, heat capacity and the conductivity of the borehole material and is therefore used to obtain estimates on these important parameters. This standard applies to heat exchangers installed in vertical or inclined boreholes of a common length up to e. g. 400 m and of a diameter of up to 200 mm.