Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Numerical Modeling of Thermally Induced Pore Water Flow in Saturated Soil Surrounding Geothermal Piles
Among several parameters that affect pile-soil heat exchange, ground thermal properties play a major role. Although heat conduction is commonly considered to be the key heat transfer mechanism within the ground, heat convection in the presence of ground water flow can increase heat rejection and extraction to and from the ground. On the other hand, temperature gradient induced by thermal operations of geothermal piles may alter pore fluid density, and consequently, buoyant flow can occur even under hydrostatic condition within saturated soil in the vicinity of heat exchanger piles. Thermally induced pore water flow and its effect on temperature increment in the soil surrounding geothermal piles are investigated in this paper by coupling heat transfer equations and Brinkman’s momentum equation that considers a Boussinesq buoyancy term. Results demonstrate that thermally induced pore water flow in saturated soil may cause a considerable reduction in ground temperature increment in a zone surrounding the pile. Such a reduction in ground temperature increment for most part of the pile length is expected to increase heat exchange efficiency of geothermal piles.
Numerical Modeling of Thermally Induced Pore Water Flow in Saturated Soil Surrounding Geothermal Piles
Among several parameters that affect pile-soil heat exchange, ground thermal properties play a major role. Although heat conduction is commonly considered to be the key heat transfer mechanism within the ground, heat convection in the presence of ground water flow can increase heat rejection and extraction to and from the ground. On the other hand, temperature gradient induced by thermal operations of geothermal piles may alter pore fluid density, and consequently, buoyant flow can occur even under hydrostatic condition within saturated soil in the vicinity of heat exchanger piles. Thermally induced pore water flow and its effect on temperature increment in the soil surrounding geothermal piles are investigated in this paper by coupling heat transfer equations and Brinkman’s momentum equation that considers a Boussinesq buoyancy term. Results demonstrate that thermally induced pore water flow in saturated soil may cause a considerable reduction in ground temperature increment in a zone surrounding the pile. Such a reduction in ground temperature increment for most part of the pile length is expected to increase heat exchange efficiency of geothermal piles.
Numerical Modeling of Thermally Induced Pore Water Flow in Saturated Soil Surrounding Geothermal Piles
Ghasemi-Fare, Omid (Autor:in) / Basu, Prasenjit (Autor:in)
IFCEE 2015 ; 2015 ; San Antonio, Texas
IFCEE 2015 ; 1668-1677
17.03.2015
Aufsatz (Konferenz)
Elektronische Ressource
Englisch
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