Thermal response testing through the Chalk aquifer in London, UK
| Autor: | William Powrie, Fleur Loveridge, T. O. L. Roberts, Gary Holmes |
|---|---|
| Rok vydání: | 2013 |
| Předmět: |
Engineering
geography geography.geographical_feature_category Groundwater flow business.industry Renewable heat Borehole Aquifer Geotechnical Engineering and Engineering Geology Thermal conductivity Thermal response test Heat transfer Thermal Earth and Planetary Sciences (miscellaneous) Geotechnical engineering business |
| Zdroj: | Proceedings of the Institution of Civil Engineers - Geotechnical Engineering. 166:197-210 |
| ISSN: | 1751-8563 1353-2618 |
| DOI: | 10.1680/geng.12.00037 |
| Popis: | Thermal conductivity of the ground is an important parameter in the design of ground energy systems, which have an increasing role to play in providing renewable heat to the built environment. For larger schemes, the bulk thermal conductivity of the ground surrounding the system is often determined in situ using a thermal response test. Although this test method is commonly used, its limitations are often not fully understood, leading to an over-simplistic interpretation that may fail to identify key facets of the ground thermal behaviour. These limitations are highlighted using data from an instrumented thermal response test carried out in a 150 m deep borehole in east London. It is shown that a single, unique value of bulk thermal conductivity may not be appropriate, as stratification of the ground can lead to differences in thermal performance, depending on the direction of heat flow. Groundwater flow within the Chalk aquifer is also shown to have an important effect on the long-term heat transfer characteristics. |
| Databáze: | OpenAIRE |
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