THERMAL SCIENCE

International Scientific Journal

Songying Zhao

,

Yifan Zhu

,

Kai Xu

,

Hong Chang

,

Lei Chen

EXPERIMENTAL AND SIMULATION STUDY ON THE THERMAL-MECHANICAL PERFORMANCE OF PHASE CHANGE ENERGY PILE

ABSTRACT
Phase change materials are incorporated into concrete to create phase change pile storage concrete, significantly enhancing the heat transfer efficiency of energy piles. However, adding these aggregates reduces concrete strength. This research examines how different proportions of steel balls, silicon carbide powder, and steel fibers affect the thermal and mechanical properties of pile foundation concrete. An orthogonal test under compressive design strength shows that a mix of 9% silicon carbide powder, 0.7% steel fiber, and 15% steel balls increases thermal conductivity by 25.3%. Numerical simulations with this optimized ratio indicate a 21% increase in heat transfer per unit depth compared to standard energy piles. The phase change energy pile notably lessens thermal effects on soil. Within 30 days of operation, its thermal influence radius decreased by 11.9%. Furthermore, maximum reductions in side friction, pile side stress, and displacement were recorded at 95.9%, 59.1%, and 80.3%, respectively, demonstrating excellent structural stability.
KEYWORDS
phase change materials, energy pile, enhance heat transfer, mechanical properties
PAPER SUBMITTED: 2024-06-30
PAPER REVISED: 2024-10-01
PAPER ACCEPTED: 2024-10-11
PUBLISHED ONLINE: 2024-11-09
DOI REFERENCE: https://doi.org/10.2298/TSCI240630243Z
CITATION EXPORT: view in browser or download as text file
THERMAL SCIENCE YEAR 2025, VOLUME 29, ISSUE Issue 3, PAGES [2369 - 2381]
REFERENCES
  1. Shortall, R., et al., Geothermal Energy for Sustainable Development: A Review of Sustainability Impacts and Assessment Frameworks, Renewable and Sustainable Energy Reviews, 44 (2015), Apr., pp. 391-406
  2. Hamada, Y., et al., Field Performance of an Energy Pile System For Space Heating, Energy & Buildings, 39 (2006), 5, pp. 517-524
  3. Bozis, D., et al., On the Evaluation of Design Parameters Effects on the Heat Transfer Efficiency of Energy Piles, Energy & Buildings, 43 (2010), 4, pp. 1020-1029
  4. Zhao, Q., et al., Study on the Thermal Performance of Several Types of Energy Pile Ground Heat Exchangers: U-Shaped, W-Shaped and Spiral-Shaped, Energy & Buildings, 133 (2016), Dec., pp. 335-344
  5. Luo, J., et al., Thermo-Economic Analysis Of Four Different Types Of Ground Heat Exchangers In Energy Piles, Applied Thermal Engineering, 108 (2016), Sept., pp. 11-19
  6. Chang, H., et al., Study on the Thermal Response of Spiral Energy Piles Based on Field Test, Thermal Science, 27 (2023), 1A, pp. 195 - 205
  7. You, T.,.Yang, H., Influences of Different Factors on the 3-D Heat Transfer of Spiral-Coil Energy Pile Group with Seepage, International Journal of Low-Carbon Technologies, 15 (2020), 3, pp. 458-470
  8. Zhang, W., et al., The Influence of Groundwater Seepage on the Performance of Ground Source Heat Pump System with Energy Pile, Applied Thermal Engineering, 162 (2019), C, pp. 114217-114217
  9. Tian, Y., Weitao, Z., Zoning Operation of Energy Piles to Alleviate the Soil Thermal Imbalance of Ground Source Heat Pump Systems, Energy and Built Environment, 4 (2023), 1, pp. 57-63
  10. Xu, B., et al., Study on Heat Transfer Performance of Geothermal Pile-Foundation Heat Exchanger with 3-U Pipe Configuration, International Journal of Heat and Mass Transfer, 147 (2020), Feb., pp. 119020-119020
  11. Park, S., et al., Effect of Thermal Interference on Energy Piles Considering Various Configurations of Heat Exchangers, Energy & Buildings, 199 (2019), Sept., pp. 381-401
  12. Qingwen, L., et al., Enhancing Heat Transfer in the Heat Exchange Medium of Energy Piles, Journal of Building Engineering, 40 (2021), 102375
  13. Barbi, S., et al., Phase Change Material Evolution in Thermal Energy Storage Systems for the Building Sector, with a Focus on Ground-Coupled Heat Pumps, Polymers (Basel), 14 (2022), 3, 620
  14. Liang, M., Thermal Performance Experiment and Numerical Simulation of Micro-PCM Cement Mortar Composite Wall, Thermal Science, 27 (2023), 4A, pp. 3013-3028
  15. Ganbin, L., et al., Experiment and Simulation on Thermodynamic Characteristics of Phase Change SteeBall Concrete Energy Pile (in Chinese), Journal of Hunan University (Natural Sciences), 50 (2023), 11, pp. 136-146
  16. Li, X., et al., Research on U-Tube Heat Exchanger with Shape-stabilized Phase Change Backfill Material, Procedia Engineering, 146 (2016), Dec., pp. 640-647
  17. Liu, Z., et al., Application of Phase Change Energy Storage in Buildings: Classification of Phase Change Materials and Packaging Methods, Thermal Science, 26 (2022), 5B, pp. 4315-4332
  18. Zhang, X., et al., Numerical Simulation of Heat-Storage Performance of Filling Body with Uniformly Mixed Phase Change Paraffin, Thermal Science, 27 (2023), 6A, pp. 4609 - 4624
  19. Chang, H., et al., Experimental Study of Phase Change Energy Pile Based on Gum Arabic and Polyethylene Glycol 600 under Multiple Thermal-Cold Cycles, Construction and Building Materials, 438 (2024), 137109
  20. Kong, L.-P., et al., A Study on Heat Transfer Characteristics and Pile Group Influence of Enhanced Heat Transfer Energy Piles, Journal of Building Engineering, 24 (2019), 100768
  21. Zhang, H., et al., Graphite as Anode Materials: Fundamental Mechanism, Recent Progress and Advances, Energy Storage Materials, 36 (2021), Apr., pp. 147-170
  22. Li, Q., et al., Enhancing Heat Transfer in the Heat Exchange Medium of Energy Piles, Journal of Building Engineering, 40 (2021), 102375
  23. Kousksou, T., et al., Paraffin Wax Mixtures as Phase Change Materials, Solar Energy Materials and Solar Cells, 94 (2010), 12, pp. 2158-2165
  24. Lu, B., et al., Experimental investigation on Thermal Properties of Paraffin/Expanded Graphite Composite Material for Low Temperature Thermal Energy Storage, Renewable Energy, 178 (2021), Nov., pp. 669-678
  25. Cui, H., et al., Experimental Study on Thermo-Mechanical Behavior of a Novel Energy Pile with Phase Change Materials Using Fiber Bragg Grating Monitoring, Sustainability, 16 (2023), 1, 206
  26. Dong, Z., et al., Development of Hollow Steel Ball Macro-Encapsulated PCM for Thermal Energy Storage Concrete, Materials, 9 (2016), 1, 59
  27. Yan, J. B., Gao, S., Experimental Study on Heat Transfer Enhancement of Heat Storage Material for Energy Pile, Thermal Science, 27 (2023), 1B, pp. 591-597
  28. Cui, H., et al., Study on the Thermal and Mechanical Properties of Steel Fibre Reinforced PCM-HSB Concrete for High Performance in Energy Piles, Construction and Building Materials, 350 (2022), 128822
  29. Kim, H. G., et al., Assessment of PCM/SiC-Based Composite Aggregate in Concrete, Energy Storage Performance, 258 (2020), 119637
  30. Bahari, A., et al., Modification of Portland Cement with NanoSiC, Proc. Natl. Acad. Sci., India, Sect. A, Phys. Sci., 86 (2016), Jan., pp. 323-331
  31. Yu, R., et al., Study on Preparation and Heat Transfer Enhancement of Expanded Graphite/Paraffin Composites, Journal of Physics: Conference Series, 2671 (2024), 012021
  32. Juchun, T., Jianmin, W., New Study on Determining the Weight of Index in Synthetic Weighted Mark Method, Systems Engineering-Theory & Practice, 21 (2001), 08, pp. 43-48
  33. Kong, L.-P., et al., A Study On Heat Transfer Characteristics and Pile Group Influence of Enhanced Heat Transfer Energy Piles, Journal of Building Engineering, 24 (2019), July, pp. 100768-100768
  34. Bao, X., et al., Experimental Study on Thermal Response of a PCM Energy Pile in Unsaturated Clay, Renewable Energy, 185 (2022), Feb., pp. 790-803
  35. Ziming, C., et al., Influence of Backfilling Phase Change Material on Thermal Performance of Precast High-Strength Concrete Energy Pile, Renewable Energy, 184 (2022), Jan., pp. 374-390
  36. Liu, H.-L., et al., Ultimate Bearing Capacity of Energy Piles in Dry and Saturated Sand, Acta Geotechnica, 14 (2019), 3, pp. 869-879
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Experimental and simulation study on the thermal-mechanical performance of phase change energy pile

2025 Society of Thermal Engineers of Serbia. Published by the Vinča Institute of Nuclear Sciences, National Institute of the Republic of Serbia, Belgrade, Serbia. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution-NonCommercial-NoDerivs 4.0 International licence