A thermal response test (TRT) is used to determine the thermal properties of the ground. There is no direct way to measure ground thermal conductivity and borehole thermal resistance. The TRT is vital for designing ground source heat pumps and seasonal thermal energy storage (STES) systems. A TRT is an indirect (in-situ) measurement method which is the simplest and most exact way to determine precise thermal properties (Gehlin 2002).[1] Thermal response tests were first suggested by Mogensen (1983) at an international conference in Stockholm.[2] Mogensen suggested a simple arrangement in which heat at constant power is injected into (or extracted from) a borehole while the borehole mean temperature is measured.
^Mogensen P. 1983. Fluid to Duct Wall Heat Transfer in Duct System Heat Storage. Proc. Int. Conf. On Subsurface Heat Storage in Theory and Practice. Stockholm. Sweden, June 6–8, 1983. PP: 652-657.
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