COMPARISONS ON THE RESPONSE OF SHALLOW GEOTHERMAL ENERGY PILE EMBEDDED IN SOFT AND FIRM SOILS

2015 ◽  
Vol 77 (11) ◽  
Author(s):  
Aminaton Marto ◽  
Ahmad Mahir Makhtar ◽  
Adriana Amaludin
Keyword(s):  
Geothermal Energy ◽  
Thermal Load ◽  
Soft Soil ◽  
Thermal Loads ◽  
Thermally Induced ◽  
Energy Pile ◽  
Global Factor ◽  
Shallow Geothermal Energy ◽  
Load Tests ◽  
Building Cooling

Shallow geothermal energy pile, particularly the one used in tropical countries, is a sustainable geostructure system that transforms the soil surrounding the geostructure as a heat sink, for building cooling purposes. Thermal loads stored in the soil will cause thermally induced settlement. A series of laboratory tests were performed to study the behaviour of model energy piles installed in kaolin soil with soft and firm consistencies. Twelve tests which included thermal load tests (35˚C and 40˚C) and thermo-axial load tests (100 N and 200 N, combined with thermal loads) were performed. The pile response to thermal and thermo-axial loads were attributed to the soil consistency and the magnitude of the loads applied to the pile head. Firm soils produce lower thermally induced settlement, due to higher level of restraint compared to soft soils. To ensure that the thermo-axial settlement does not exceed the limiting settlement, the recommended global factor of safety used for soft soil and firm soils subjected to 40˚C thermal load should be more than 4.0 and 2.5, respectively.

scholarly journals A review of shallow geothermal energy pile from numerical study

2018 ◽  
Author(s):  
M. M. Nujid ◽  
J. Idrus ◽  
K. A. Hashim ◽  
D. A. Tholibon ◽  
N. S. Azizan
Keyword(s):  
Geothermal Energy ◽  
Numerical Study ◽  
Energy Pile ◽  
Shallow Geothermal Energy

scholarly journals Load transfer approach for the geotechnical analysis of energy piles in a group with slab

2020 ◽  
Vol 205 ◽  
pp. 05008
Author(s):  
Elena Ravera ◽  
Melis Sutman ◽  
Lyesse Laloui
Keyword(s):  
Load Transfer ◽  
Individual Response ◽  
Thermal Loads ◽  
Thermally Induced ◽  
Soil Response ◽  
Energy Pile ◽  
Analysis And Design ◽  
Energy Piles ◽  
Transfer Method ◽  
Load Transfer Method

Thermally induced group effects characterise closely spaced energy piles. It has been observed experimentally that the behaviour of energy piles subjected to mechanical and thermal loads, in which the piles are located sufficiently close to each other, is different from the behaviour of single isolated piles. Therefore, civil engineers encounter new challenges in the geotechnical design of such foundations. This leads to the necessity to develop practical tools to address their analysis and design. The conventional load transfer method is one of the commonly used methods for the analysis of axially loaded conventional piles. Thus, the purpose of this study has been to propose a formulation of the load transfer method to consider the thermally induced effects among energy piles in groups. The soil response is characterized in a lumped form by ascribing the behavioural features of the soil to interface elements. The individual response, in terms of strain and stress of an energy pile in a group, can be addressed for the first time through the application of the displacement factor in the load displacement curve of the single isolated energy pile. A validation through a full-scale field test reveals the capability of the approach to provide the necessary information in the analysis and design phases of the foundation for one-way thermal loads.

Technological advances and applications of geothermal energy pile foundations and their feasibility in Australia

2010 ◽  
Vol 14 (9) ◽  
pp. 2683-2696 ◽  
Author(s):  
Monique de Moel ◽  
Peter M. Bach ◽  
Abdelmalek Bouazza ◽  
Rao M. Singh ◽  
JingLiang O. Sun
Keyword(s):  
Geothermal Energy ◽  
Pile Foundations ◽  
Energy Pile ◽  
Technological Advances

scholarly journals Improvement on the Calculation of Heat Transfer Rate for a New Type of Geothermal Energy Pile

IFCEE 2021 ◽  
2021 ◽  
Author(s):  
Yong Zou ◽  
Jie Huang ◽  
Fei Wang ◽  
John S. McCartney ◽  
Elahe Jafari
Keyword(s):  
Heat Transfer ◽  
Heat Transfer Rate ◽  
Geothermal Energy ◽  
Transfer Rate ◽  
Energy Pile ◽  
New Type

Exact Solution of Axial Stress for a Multilayered Pressure Vessel Subjected to Mechanical and Thermal Loads

2012 ◽  
Vol 197 ◽  
pp. 185-189
Author(s):  
Ze Wu Wang ◽  
Qian Zhang ◽  
Liang Zhi Xia ◽  
Da Peng Hu
Keyword(s):  
Exact Solution ◽  
Numerical Solution ◽  
Pressure Vessel ◽  
Thermal Load ◽  
Structural Strength ◽  
Axial Stress ◽  
Urea Synthesis ◽  
Thermal Loads ◽  
Precise Calculation ◽  
Good Agreement

At present, limited work was reported on the exact solution of axial stress for a multilayered pressure vessel subjected to mechanical and thermal loads. However, the axial stress plays an important role to the structural strength due to the influence of thermal load. Based on the theory of thermo-elasticity and finite element (FE) technology, therefore, the exact solution and numerical solution were constructed for a multilayered urea synthesis tower made of different kinds of materials subjected to an internal pressure and a thermal load. Results show good agreement between the theoretical solution and numerical solution, and thus it demonstrates the reliability of the derivation process and developed calculation formula, which would be helpful for more precise calculation and scientific design of the multilayered pressure vessel.

Utilisation of Ambient Air and Shallow Geothermal Energy

2007 ◽  
pp. 385-435
Author(s):  
Martin Kaltschmitt ◽  
Wolfgang Streicher ◽  
Andreas Wiese
Keyword(s):  
Geothermal Energy ◽  
Ambient Air ◽  
Shallow Geothermal Energy

Harmonized web-based information systems for shallow geothermal energy use in Austria

2021 ◽  
Author(s):  
Cornelia Steiner ◽  
Gregor Goetzl ◽  
Martin Fuchsluger ◽  
Alexander Rehbogen
Keyword(s):  
Geothermal Energy ◽  
Role Model ◽  
Energy Use ◽  
Green Energy ◽  
Energy Resources ◽  
Infrastructure Development ◽  
Information Platform ◽  
Groundwater Availability ◽  
Shallow Geothermal Energy ◽  
Cover Ratio

<p>Neither regional development, construction projects nor infrastructure development – structural planning does not fully consider energy supply in Austria (yet). The project “Spatial Energy Planning for Heat Transition” is part of the research initiative “Green Energy Lab”, which has a project life-time from June 2018 to May 2021. It aims to provide a sound basis for the integration of heat in private and public planning processes and for the implementation of the energy infrastructure of the future together with energy providers.</p><p>Three Austrian states (Vienna, Styria and Salzburg), their capital cities and pilot-municipalities of all scales work together to provide all information necessary for the implementation of spatial heat-planning – as role model for Austria and other European countries. The GIS-based web-tool “heat-atlas” will provide this harmonized data and serve an information platform for project developers as well as for regional planning, fostering a sustainable use of all available sustainable energy resources and infrastructures to their full extent. The system of the information platform is arbitrarily scalable and is aimed to be expanded to other interested regions of Austria on demand.</p><p>One part of this “heat-atlas” is about shallow geothermal energy and covers vertical closed loop and open loop systems. The Geological Survey of Austria developed new methods to estimate capacity and energy resources as well as to show possible limitations of shallow geothermal energy use on property level. The resource calculations combine location-specific parameters such as thermal conductivity, underground temperature and groundwater availability with system-specific parameters such as mode of operation, operational hours, geometry and threshold values demanded by official regulations.</p><p>The method provides not only information about the maximum amount of energy available on the property, but also about the cover ratio of the demand. So called level-1 maps show the resources for standardized well-doublets and borehole heat exchangers independently of the property. The calculations for level-2 maps consider site-specific properties such as heating and cooling demand, operational hours and size of the property. This enables the estimation of the overall energy resources and the cover ratio of the property.</p><p>The results are shown as maps and as location specific query, which gives a concise summary of all relevant information for one location in form of an automatically generated report. More information about the project is available at http://www.waermeplanung.at/.</p>

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