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Ground Thermal Diffusivity Calculation by Direct Soil Temperature Measurement. Application to very Low Enthalpy

José Manuel Andújar Márquez1, Miguel Ángel Martínez Bohórquez2, Sergio Gómez Melgar3

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This study introduces a simple, cost-effective method to measure soil thermal diffusivity using temperature readings. This technique is valuable for designing geothermal energy systems and has applications in construction, agriculture, and biology.

Keywords:
ground temperature probeground thermal diffusivityinstrumentation systemsoil temperaturevery low enthalpy geothermal energy

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Area of Science:

  • Geotechnical Engineering
  • Renewable Energy Systems
  • Environmental Science

Background:

  • Accurate soil thermal properties are crucial for designing efficient geothermal energy systems.
  • Existing methods for measuring thermal diffusivity can be complex and costly.
  • Very low enthalpy geothermal energy (VLEGE) systems require precise ground thermal data for optimal performance.

Purpose of the Study:

  • To develop and validate a methodology and instrumentation system for the indirect measurement of soil thermal diffusivity.
  • To enable cost-effective thermal property assessment using existing geotechnical boreholes.
  • To support the design and sizing of VLEGE systems and explore broader applications.

Main Methods:

  • Indirect measurement of soil thermal diffusivity by analyzing temperature data at a specific depth.
  • Utilizing temperature measurements taken during routine geotechnical drilling.
  • Development of a dedicated instrumentation system for temperature data acquisition.

Main Results:

  • The proposed methodology provides an accurate and inexpensive way to determine soil thermal diffusivity.
  • The system was successfully tested and applied in the design of a VLEGE facility.
  • Experimental results confirmed the validity and effectiveness of the developed approach.

Conclusions:

  • The presented methodology offers a practical solution for assessing soil thermal properties.
  • This approach can significantly reduce costs and complexity in VLEGE system design.
  • The technique has potential applications across various fields including construction, agriculture, and biology.