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Thermal response test : ウィキペディア英語版 | Thermal response test
Thermal response test (TRT) is used to determine the thermal properties of the ground. There is no direct way to measure the ground thermal conductivity and the borehole thermal resistance. These tests are vital for designing ground source heat pump 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 the effective thermal properties, Gehlin 2002.〔http://epubl.ltu.se/1402-1544/2002/39/index-en.html〕 Thermal Response Tests were first suggested by Mogensen (1983) at an international conference in Stockholm.〔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.〕 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. ==Equipment== The system consists of a borehole, pipe system, circulation pump, a chiller or heater with constant power rate, and continuous logging of the inlet and outlet temperatures of the flow. The thermal response data (i.e. temperature development in the borehole at a certain energy injection/extraction) allow estimation of the effective thermal conductivity of the ground and the thermal resistance of the borehole.
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