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http://hdl.handle.net/10397/78985
| Title: | Simulation of thermo-mechanical performance of Pile Geothermal Heat Exchanger (PGHE) considering temperature-depend interface behavior | Authors: | Wang, D Lu, L Cui, P |
Issue Date: | 5-Jul-2018 | Source: | Applied thermal engineering, 5 July 2018, v. 139, p. 356-366 | Abstract: | Pile geothermal heat exchanger (PGHE) has attracted great interests in recent years, but some new challenges have emerged with its application, especially in understanding its thermo-mechanical behaviors. In this paper, based on the experimental data from a modified direct shear test, a finite element simulation model is developed to investigate the thermo-mechanical behavior of PGHE. The simulation model has been verified by an in-suit test. The influence of interface behavior, thermal loads, and soil properties on the PGHE's thermo-mechanical behavior has been investigated. The results show that the changes in contact force and friction coefficient has to be considered in a comprehensive way in estimating the influence of thermal load on the bearing capacity of PGHE. Compared with the results without thermal loads, bearing capacity of PGHE shows a decreasing ratio of 8.7%, and an increasing ratio of heating is found to be 13.2%. In addition, the simulation results suggest that without head load imposed, at a certain depth, the axial stress has a linear relationship with the change of temperature, but when a head load is imposed, the linear relationship is only separately valid in 'each temperature region (heating or cooling). The thermo-mechanical performance of PGHE should be fully considered during the design stage, and this paper has the certain actual reference significance to engineering applications. | Keywords: | Ground-coupled heat pump Pile geothermal heat exchanger Thermo-mechanical performance Energy pile |
Publisher: | Pergamon Press | Journal: | Applied thermal engineering | ISSN: | 1359-4311 | EISSN: | 1873-5606 | DOI: | 10.1016/j.applthermaleng.2018.02.020 | Rights: | © 2018 Elsevier Ltd. All rights reserved © 2018. This manuscript version is made available under the CC-BY-NC-ND 4.0 license https://creativecommons.org/licenses/by-nc-nd/4.0/ The following publication Wang, D., Lu, L., & Cui, P. (2018). Simulation of thermo-mechanical performance of pile geothermal heat exchanger (PGHE) considering temperature-depend interface behavior. Applied Thermal Engineering, 139, 356-366 is available at https://doi.org/10.1016/j.applthermaleng.2018.02.020. |
| Appears in Collections: | Journal/Magazine Article |
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|---|---|---|---|---|
| Simulatithermo-mechanical_Performance_Pile.pdf | Pre-Published version | 2.11 MB | Adobe PDF | View/Open |
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