期刊
ACTA GEOTECHNICA
卷 10, 期 2, 页码 209-218出版社
SPRINGER HEIDELBERG
DOI: 10.1007/s11440-014-0333-0
关键词
Energy foundations; Ground source heat pumps; Needle probe; Thermal cell; Thermal conductivity
资金
- EPSRC [EP/H0490101/1]
- Mott MacDonald Group Ltd
- Cementation Skanska Ltd
- WJ Groundwater Ltd
- Golder Associates
- Engineering and Physical Sciences Research Council [EP/H049010/1] Funding Source: researchfish
- EPSRC [EP/H049010/1] Funding Source: UKRI
Soil thermal conductivity is an important factor in the design of energy foundations and other ground heat exchanger systems. It can be determined by a field thermal response test, which is both costly and time consuming, but tests a large volume of soil. Alternatively, cheaper and quicker laboratory test methods may be applied to smaller soil samples. This paper investigates two different laboratory methods: the steady-state thermal cell and the transient needle probe. U100 soil samples were taken during the site investigation for a small diameter test pile, for which a thermal response test was later conducted. The thermal conductivities of the samples were measured using the two laboratory methods. The results from the thermal cell and needle probe were significantly different, with the thermal cell consistently giving higher values for thermal conductivity. The main difficulty with the thermal cell was determining the rate of heat flow, as the apparatus experiences significant heat losses. The needle probe was found to have fewer significant sources of error, but tests a smaller soil sample than the thermal cell. However, both laboratory methods gave much lower values of thermal conductivity compared to the in situ thermal response test. Possible reasons for these discrepancies are discussed, including sample size, orientation and disturbance.
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