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Research Papers

Analysis of Thermo-Active Foundations With U-Tube Heat Exchangers

[+] Author and Article Information
Khaled Rouissi

 Ecole Polytechnique de Tunisie, P.O. Box 743, La Marsa 2078, Tunisia

Moncef Krarti, John S. McCartney

Department of Civil, Environmental and Architectural Engineering,  University of Colorado, Boulder, CO 80309

J. Sol. Energy Eng 134(2), 021008 (Mar 06, 2012) (8 pages) doi:10.1115/1.4005755 History: Received February 16, 2011; Accepted October 26, 2011; Published March 01, 2012; Online March 06, 2012

This paper presents a heat transfer model for thermo-active drilled-shaft foundations used for heating and cooling buildings. Specifically, this paper presents a numerical approach to evaluate the unsteady temperature distribution within the ground medium surrounding the foundation as well as indoor/outdoor heat fluxes. In particular, a 2D numerical solution was obtained using the finite difference technique with a purely implicit solution scheme. The results of the sensitivity analysis indicate that the efficiency of the thermo-active foundation can be significantly improved with a proper selection of design parameters including heat exchanger fluid flow velocity, foundation depth, and foundation materials.

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Copyright © 2012 by American Society of Mechanical Engineers
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Figures

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Figure 1

Description of a thermo-active foundation with a U tube

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Figure 2

Control volume for the finite difference method

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Figure 3

Geometric mesh for a layered soil

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Figure 4

Variation of the total slab heat flux normalized error and the CPU time as functions of the number of nodes N in a mesh

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Figure 5

Soil temperature isotherms for four representative days during 1 year

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Figure 6

Variation of the indoor heat flux Vs the distance from the wall

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Figure 7

Variation of the outdoor heat flux Vs the distance from the wall

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Figure 8

Variation of the indoor and the outdoor total heat flux over the course of 2 years

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Figure 9

Annual variation of the inlet, outlet, and indoor temperatures

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Figure 10

Annual variation of heat charge (inlet temperature – outlet temperature)

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Figure 11

Impact of the depth of the foundation on outlet fluid temperatures

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Figure 12

Variation of the rate charge80m /charge40m

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Figure 13

Annual variation of the inlet, outlet, and indoor temperature

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Figure 14

Annual variation of the inlet, outlet, and indoor temperatures

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