Oscillatory thermal response tests to estimate the ground thermal diffusivity

Lamarche, Louis; Raymond, Jasmin; Giordano, Nicolò

doi:10.1016/j.apenergy.2023.122078

Cited by 1 publication

(1 citation statement)

References 17 publications

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“…This problem can be addressed by using methods for measuring thermal diffusivity in situ. These methods can be grouped into two categories: The first system is based on the thermal response test (TRT), as presented in studies such as [3,4,[14][15][16][17][18], among others. The second relies on extensive time series of naturally occurring ground temperature measurements at different depths, as discussed by [19][20][21][22][23][24][25][26][27][28].…”

Section: Introductionmentioning

confidence: 99%

Thermal Diffusivity in the Subsoil: A Case Study in the Asturias (Northern Spain)

Marcos-Robredo,

Castro-García,

Rey-Ronco

et al. 2023

Energies

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This study presents a novel methodology for determining the apparent thermal diffusivity of subsoil in situ, employing two heat transfer models within the subsurface: one method is based on heat conduction caused by air temperature oscillations, while the other considers heat transmission via both conduction and convection due to groundwater flow. Differential equations were solved, and non-linear regression analysis was employed. This method has direct applications in various engineering and environmental domains, such as underground transmission lines, oil and gas pipelines, radioactive waste management, and geothermal systems, especially in the context of implementing horizontal geothermal collectors (HGC). The apparent thermal diffusivity value of 1.514 × 10−6 m2 s−1, within a 95% confidence interval spanning 1.512 × 10−6 m2 s−1 and 1.516 × 10−6 m2 s−1, was obtained from the section between 1.67 and 3.86 m depth in a research borehole located in Asturias, Northern Spain, using twenty-one temperature sensors. The method allowed for the calculation of the subsoil’s apparent thermal diffusivity up to a depth of 14.55 m.

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