Abstract #

This article presents the basic elements necessary for the design and construction of an active piled raft foundation used as a heat exchanger in the climate control system of an industrial building in Jaén, Andalusia. The study highlights the main physical variables, analysis methods, and common issues during the installation of the heat exchanger. The paper also discusses the instrumentation installed in the active foundation to monitor temperatures.

Technical Relevance #

This document is highly relevant for geotechnical and civil engineers involved in foundation design, particularly in projects where foundations are used for both structural support and geothermal energy exchange. It provides insights into integrating geotechnical and thermal design considerations, making it essential for professionals working on energy-efficient building projects.

Target Audience #

The document is intended for geotechnical engineers, civil engineers, and professionals involved in the design and construction of foundations, particularly those interested in the application of geothermal energy in building climate control systems. It is also relevant for researchers and students studying advanced foundation techniques.

Software and Methodology #

The geotechnical analysis and design of the piled raft foundation were carried out using the PLATE software from the GEO4 suite, which employs the Finite Element Method (FEM) for solving foundation slab problems. The analysis includes thermal simulations to evaluate the heat exchange between the foundation and the ground. The design also considers the specific geotechnical conditions of the site, characterized by complex soil layers.

Process Description #

The paper begins with a description of the geotechnical and geological conditions of the site in Jaén, detailing the stratigraphy and the mechanical properties of the soils. The design process is outlined, including the configuration of the heat exchanger within the foundation, the installation of the micropiles, and the structural reinforcement of the slab. The document also discusses the construction challenges and the solutions implemented to ensure the efficiency of the geothermal system.

Main Findings #

The study demonstrates that the use of an active piled raft foundation can significantly contribute to the thermal efficiency of the building, providing up to 140 kW of the total 772 kW required for climate control. The integration of geotechnical and thermal design considerations ensures both the structural integrity of the foundation and its effectiveness as a heat exchanger.

Practical Applications #

The findings from this study are directly applicable to the design and construction of energy-efficient foundations in industrial and commercial buildings. Engineers can apply the methodologies and design strategies discussed to optimize the use of geothermal energy in foundation systems, enhancing both structural performance and energy efficiency.

Limitations and Considerations #

The document acknowledges that the success of the active foundation depends on accurate soil characterization and precise installation of the heat exchanger components. The study is based on specific geological conditions found in Jaén, and the design may need to be adapted for use in different environments with varying soil properties and thermal conditions.

Conclusions #

The paper concludes that an active piled raft foundation is a viable solution for integrating structural support with geothermal energy exchange in industrial buildings. The case study from Jaén demonstrates the potential for significant energy savings and reduced CO2 emissions, making it an attractive option for sustainable building design. The study highlights the importance of combining geotechnical and thermal analyses to achieve optimal results.

Related Resources #

Further reading includes case studies on the application of geothermal foundations in other industrial projects, as well as research on the design and optimization of thermal-active structures. Additional resources on the use of FEM in foundation design can provide deeper insights into improving both structural and energy performance.

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