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Thermal conductivity of soils by the needle probe method, for energy foundation applications

Thermal conductivity of soils by the needle probe method, for energy foundation applications
Thermal conductivity of soils by the needle probe method, for energy foundation applications
Soil thermal conductivity is an important parameter in the design of ground source heat pump and energy foundation systems. One laboratory method for measuring the soil thermal conductivity is the needle probe method. Previously, analysis of the needle probe test data has been simplistic, relying heavily on human judgment and rules of thumb. This paper presents an alternative method of analyzing the needle probe data with the aid of a MATLAB program. Four agar-kaolin specimens of varying densities were prepared to resemble simple soils. These were tested using the needle probe for a range of heating times and heating powers, to see what effect these parameters would have on the results. The repeatability when keeping the heating time and heating power constant was within ±2%. When the heating time and heating power were varied, the variation in results from the average for a given specimen ranged from ±4% to +10%/-8%. This range is significantly higher than the repeatability. Possible reasons for this are discussed
Low, J.
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Loveridge, F.A.
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Powrie, W.
600c3f02-00f8-4486-ae4b-b4fc8ec77c3c
Low, J.
b43962ad-3717-4981-a2a6-e33118a33f85
Loveridge, F.A.
fb5b7ad9-d1b8-40d3-894b-bccedf0e8a77
Powrie, W.
600c3f02-00f8-4486-ae4b-b4fc8ec77c3c

Low, J., Loveridge, F.A. and Powrie, W. (2014) Thermal conductivity of soils by the needle probe method, for energy foundation applications. 32nd International Thermal Conductivity Conference and 20th International Thermal Expansion Symposium, Lafeyette, United States. 27 Apr - 01 May 2014. 11 pp .

Record type: Conference or Workshop Item (Paper)

Abstract

Soil thermal conductivity is an important parameter in the design of ground source heat pump and energy foundation systems. One laboratory method for measuring the soil thermal conductivity is the needle probe method. Previously, analysis of the needle probe test data has been simplistic, relying heavily on human judgment and rules of thumb. This paper presents an alternative method of analyzing the needle probe data with the aid of a MATLAB program. Four agar-kaolin specimens of varying densities were prepared to resemble simple soils. These were tested using the needle probe for a range of heating times and heating powers, to see what effect these parameters would have on the results. The repeatability when keeping the heating time and heating power constant was within ±2%. When the heating time and heating power were varied, the variation in results from the average for a given specimen ranged from ±4% to +10%/-8%. This range is significantly higher than the repeatability. Possible reasons for this are discussed

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Published date: 2014
Venue - Dates: 32nd International Thermal Conductivity Conference and 20th International Thermal Expansion Symposium, Lafeyette, United States, 2014-04-27 - 2014-05-01
Organisations: Infrastructure Group

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Local EPrints ID: 364338
URI: http://eprints.soton.ac.uk/id/eprint/364338
PURE UUID: 6f0ce89d-d9a5-45cf-b7b0-99967e44c943
ORCID for F.A. Loveridge: ORCID iD orcid.org/0000-0002-6688-6305
ORCID for W. Powrie: ORCID iD orcid.org/0000-0002-2271-0826

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Date deposited: 24 Apr 2014 10:56
Last modified: 02 Nov 2023 02:38

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Contributors

Author: J. Low
Author: F.A. Loveridge ORCID iD
Author: W. Powrie ORCID iD

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