| Autor: |
de Almeida Tonus, Bianca Penteado, Niedvieski, Letícia Becher, Lautenschläger, Carlos Emmanuel Ribeiro, de Hollanda Cavalcanti Tsuha, Cristina, Faro, Vítor Pereira |
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| Zdroj: |
Environmental Earth Sciences; Sep2024, Vol. 83 Issue 18, p1-17, 17p |
| Abstrakt: |
Ground source heat pump (GSHP) systems have been widely used to harvest shallow geothermal energy from the ground, providing renewable and low carbon energy sources. A comprehensive investigation of ground thermal properties is critical for effective design of GSHP systems in building heating and cooling applications. This study assesses the effectiveness of Thermal Cone Penetration Test (T-CPT) as a method for determining ground thermal conductivity of unsaturated tropical soils, in which saturation degree can vary seasonally, altering soil thermal properties. This work conducted laboratory model T-CPT tests on sand and clay soils with varying saturation degrees. For field measurements, T-CPT tests were carried out at three different sites of unsaturated tropical soils in South and Southeast regions of Brazil. As a result, measured thermal conductivity values were consistent with data available in literature. Furthermore, laboratory measurements demonstrate that soil thermal conductivity increases with saturation degree and soil density. Results indicate that T-CPT test is an efficient and practical method to capture the impact of saturation degree on thermal conductivity of unsaturated soils. The ease of test performing is a great advantage, because the field test used for this purpose is Thermal Response Test (TRT), which is a much longer test that requires prior installation of heat exchanger tubes in the soil, needs specific equipment for its execution and has a complex interpretation of results. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
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