Determining effective soil formation thermal properties from field data using a parameter estimation technique

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A one-dimensional thermal model is derived to describe the temperature field around a vertical borehole heat exchanger (BHEx) for a geothermal heat pump. The inlet and outlet pipe flows are modeled as one, and an effective heat capacity is added to model the heat storage in the fluid and pipes. Parameter estimation techniques are then used to estimate various parameters associated with the model, including the thermal conductivity of the soil and of the grout which fills the borehole and surrounds the u-tube. The model is validated using test data from an experimental rig containing sand with known thermal conductivity. ... continued below

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[50] p.

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Shonder, J.A. & Beck, J.V. November 1, 1998.

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This article is part of the collection entitled: Office of Scientific & Technical Information Technical Reports and was provided by UNT Libraries Government Documents Department to Digital Library, a digital repository hosted by the UNT Libraries. It has been viewed 11 times . More information about this article can be viewed below.

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  • Shonder, J.A. Oak Ridge National Lab., TN (United States)
  • Beck, J.V. Michigan State Univ., East Lansing, MI (United States)

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Description

A one-dimensional thermal model is derived to describe the temperature field around a vertical borehole heat exchanger (BHEx) for a geothermal heat pump. The inlet and outlet pipe flows are modeled as one, and an effective heat capacity is added to model the heat storage in the fluid and pipes. Parameter estimation techniques are then used to estimate various parameters associated with the model, including the thermal conductivity of the soil and of the grout which fills the borehole and surrounds the u-tube. The model is validated using test data from an experimental rig containing sand with known thermal conductivity. The estimates of the sand thermal conductivity derived from the model are found to be in good agreement with independent measurements.

Physical Description

[50] p.

Notes

OSTI as DE99000227

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  • American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE) winter meeting, Chicago, IL (United States), 23-27 Jan 1999

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  • Other: DE99000227
  • Report No.: ORNL/CP--99428
  • Report No.: CONF-990102--
  • Grant Number: AC05-96OR22464
  • Office of Scientific & Technical Information Report Number: 290824
  • Archival Resource Key: ark:/67531/metadc686589

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

Office of Scientific and Technical Information (OSTI) is the Department of Energy (DOE) office that collects, preserves, and disseminates DOE-sponsored research and development (R&D) results that are the outcomes of R&D projects or other funded activities at DOE labs and facilities nationwide and grantees at universities and other institutions.

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  • November 1, 1998

Added to The UNT Digital Library

  • July 25, 2015, 2:20 a.m.

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  • Jan. 25, 2016, 6:15 p.m.

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Shonder, J.A. & Beck, J.V. Determining effective soil formation thermal properties from field data using a parameter estimation technique, article, November 1, 1998; Tennessee. (digital.library.unt.edu/ark:/67531/metadc686589/: accessed December 14, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.