Heat Transfer Performance in Energy Piles in Urban Areas: Case
The design of energy piles can be challengeable due to their complicated geometries and the requirement of mechanical load. This study focuses on the heat transfer
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The design of energy piles can be challengeable due to their complicated geometries and the requirement of mechanical load. This study focuses on the heat transfer
When comparing the performance of energy pile groups with a group of borehole heat exchangers commonly used in heat storage applications, the energy piles were approximately 1.2 times more
Highlights • A laboratory-scale coupled energy pile-solar collector system was constructed. • Effects of major parameters and their inter-dependence were evaluated. •
the heat transfer characteristics of energy piles. However, the low thermal conductivity of a concrete pile significantly limits its heat transfer efficiency . In recent years, many scholars have researched improving the thermal conductivity of concrete, and many scholars have used graphite as an additive for enhancing
Furthermore, a case study of an energy pile system was carried out, encompassing load calculation, pile group simulation, economic analysis, and design optimization. A comprehensive evaluation of the technical and economic feasibility demonstrates that the system exhibits excellent performance, particularly when the ratio of cooling and heating loads
This study presents a novel heat exchanger configuration, called a deeply penetrating U-shaped configuration, for energy piles. The outlet water temperature, temperature
The heat transmission efficiency of the energy pile can be improved by raising the temperature of the soil surrounding the pile through an increase in the concrete''s thermal
The results showed that 84% of the injected thermal energy could be transferred to the surrounding soil by the energy pile, and the total amount of the thermal energy stored by a single energy
Our results suggest that (1) incorporating MicroPCM into C50 concrete specimens (up to 5 wt.%), will dramatically reduce the compressive strength of C50 concrete; (2) Thermal conductivity and heat
Wu et al. investigated the solar energy storage capacity of an energy pile-based bridge de-icing system with the bridge deck embedded with thermal pipes severing as the solar collector.
Table 9 shows some thermodynamic parameters such as energy supplied, drying time and thermal efficiency of the solar kiln in mode of drying with thermal storage (Case 1) and without thermal storage (Case 2). The energy supplied to the dryer in June was respectively 1374 and 1290 KWh with and without thermal storage.
PDF | On Sep 18, 2018, Malin Malmberg and others published High temperature borehole thermal energy storage - A case study | Find, read and cite all the research you need on ResearchGate
This work uses a validated numerical model [3, 9] to simulate a grid of evenly distributed screw piles, where Energy Piles (EP) and Thermal Storage Piles (TSP) are positioned interspersed, evenly
The results show that SiC particle gradation strongly influences the thermal conductivity of concrete, with an average thermal conductivity of 2.87 W/ (mk); additionally, the
Properly sized heat pump systems with energy piles were characterized with high overall system SCOP values higher than 4.5, while some case studies reported two times smaller SCOP values that
Yan, J.-B., et al.:Experimental Study on Heat Transfer Enhancement of 594 THERMAL SCIENCE: Year 2023, Vol. 27, No. 1B, pp. 591-597 strength, its toughening-crack resistance effect will consume
According to Park et al. (2018), the concrete''s thermal capacity has a dominant effect on the thermal performance of energy piles in short-term periods, even more than thermal conductivity. Therefore, thermal storage of heat within the pile concrete should be accurately specified, and its incorporation into analytical analysis and design software of energy pile
The energy utilization of multiple energy piles would be expected to be larger than isolated energy piles due to the increased surface area for heat transfer between the piles and the soil, as has
In addition, the effects of the pile-pile thermal interference on reducing the rate of solar energy storage after a one-year operation were quantified to be within 10 W/m for groups with the pile
Group thermal response testing for energy piles Les essais réponse thermique de groupe pour les pieux énergétiques F.A. Loveridge*1, C.G. Olgun2, T. Brettmann3 and W. Powrie1 1 University of Southampton, Southampton, UK 2 Virginia Tech, Blacksberg, USA 3 A. H. Beck Foundation Co., Inc, Houston, USA * Corresponding Author ABSTRACT Thermal response testing is an in situ
The following results are obtained from this study: (1) the thermal performances of the PHC energy pile backfilled with ordinary grout and PCM-type backfill materials (i.e., PCM, enhanced-PCM, and
As a new carrier for collecting shallow geothermal energy, energy piles have been widely used around the world. However, the existing methods are limited by different factors, and they do not further improve the heat transfer efficiency. In this article, the preparation of a new high-thermal conductivity SiC concrete (HCSC) pile is described. Primarily, a study on the
The thermal performance of energy piles equipped with new metal fins to improve heat transmission is examined in this research. The solid heat transfer module of
The results showed that 84% of the injected thermal energy could be transferred to the surrounding soil by the energy pile, and the total amount of the thermal energy stored by a single energy
Reported investigations on the thermal and thermo-mechanical performance of the whole energy pile-based GSHP system are relatively limited .The case study reported by Wood et al. had a total of 21 energy piles equipped with single U-tube pipes serving as heat exchangers.The measured coefficient of performance (CoP) of the heat pump unit was about 3.6.
Usually, the pile-pile spacing is about 3–5 times the pile diameter. Therefore, thermal interference between energy piles will occur if installed in a pile group. The rate of solar thermal energy storage is thus expected to decrease more due to an even higher increase in ground temperature for an energy pile group.
DOI: 10.1016/j.jobe.2023.106349 Corpus ID: 257672894; Experimental study of the thermodynamic properties of high thermal conductivity energy pile @article{Chang2023ExperimentalSO, title={Experimental study of the thermodynamic properties of high thermal conductivity energy pile}, author={Hong Chang and Haoquan Wang and
log, the comprehensive thermal conductivity coefficient of the energy pile was calculated to be 2.330 W/moC, according to the change rule of the average water temperature of the energy pile. This is difference with the soil thermal conductivity of 1.538 W/moC measured in the laboratory. References . Rotta Loria A.F. & Laloui, L. (2016) .
The unbalanced thermal loading of energy piles in hot-dominated climates is an important aspect to consider for these applications. Having an unbalanced thermal load can lead to an increase in soil and pile temperatures over time which then leads to a decrease in the efficiency of the system in the long term .Olgun et al. found that the extent of the
The boundary conditions applied in this model included: undisturbed ground temperature of 13oC, ground thermal conductivity of 2.3 Wm−1K−1 and concrete thermal conductivity of 1.7
Moreover, the thermal-mechanical coupling responses of the energy piles in summer and winter conditions are also different and need to be explored separately. Based on
Results revealed that implementing the PCM containers increased the energy storage from 16.4 to 48.2 kJ/kg (in the case of PCM 2), while the temperature distribution was always lower during the charging, due to the smaller thermal radius of the piles.
The results show that when the pile-to-well ratio is approximately 0.3–0.4, the heat exchange of the energy pile obtains the best benefit; the inlet water temperature is the most significant
Results. The temperature distribution (°C) for the concrete secant pile and the steel sheet piles after 100 hours of operation is shown below. At this 100hr stage, prior to reaching quasi-steady state conditions, the thermal contours show the
DOI: 10.1016/j.enbuild.2024.114658 Corpus ID: 271849368; Thermal performance of energy piles in unsaturated soils: Experiment, simulation, and case study @article{Zeng2024ThermalPO, title={Thermal performance of energy piles in unsaturated soils: Experiment, simulation, and case study}, author={Shuo Zeng and Zhenguo Yan and Jun Yang and Zhibo Duan},
Charging pile energy storage system can improve the relationship between power supply and demand. Applying the characteristics of energy storage technology to the charging piles of electric vehicles and optimizing them in conjunction with the power grid can achieve the effect of peak-shaving and valley-filling, which can effectively cut costs.
The effects of the thermal interference of piles on the performance of the system over one year is assessed for the presented case study according to an infinite pile group
Fig. 7 shows the temperature distribution along the depth of the ordinary energy pile and the high thermal conductivity energy pile at 11 h. The average temperature of the ordinary energy pile, the soil at 1 D, and the soil at 2 D are 35.07, 24.65, and 20.40 °C, and the average temperature of the high thermal conductivity energy pile, the soil
A parametric analysis is performed to investigate the effects of several important parameters (i.e., pile spacing, pile diameter, soil type, and thermal parameters) on the heat transfer performance of an energy pile group with the proposed deeply penetrating U-shaped configuration.
Regarding the influences of pile materials on the heat exchange performance levels of energy piles, Bai Lili [ 20] has introduced phase change materials into concrete to build phase change energy piles and compared the heat transfer differences.
The pile diameter is another important design parameter influencing the thermal performance of the energy pile group with a deeply penetrating U-shaped heat exchanger. Four different values, presented in Table 8, varying from 400 mm to 1000 mm, are analyzed.
For an energy pile group with a deep penetration U-shaped heat exchanger, it is important to analyze the effect of pile arrangement on thermal performance. Two common arrangements (i.e., quincuncial and squared arrangements) are discussed in this paper.
It can be noticed that the difference in the heat transfer coefficient for the Shell Centre energy pile was smaller than that for the Lambeth College one. The reason could be that the Shell Centre energy pile has a smaller diameter.
The pile spacing, S, which is the center-to-center distance between adjacent piles, is one of the most important parameters affecting the thermal performance of an energy pile group with a deeply penetrating U-shaped heat exchanger.