Sensible thermal energy storage (STES) systems involve raising the temperature of the storage material by adding heat from a source or a heat transfer fluid (HTF), thereby increasing its internal energy. STES systems have found practical application across a wide temperature range, spanning from 120 °C to 1250 °C [12].
The charging speed of the charging piles was shorted rapidly, which was a challenge for the heat dissipation system of the charging pile. In order to reduce the operation temperature of the charging pile, this paper proposed a fin and ultra-thin heat pipes (UTHPs) hybrid heat dissipation system for the direct-current (DC) charging pile.
The efficiency of heat transfer in an energy pile depends on the design parameters concerning the characteristics of the pile, pipe, concrete, fluid, and ground. The configuration of heat exchanger pipes is found to be the most influential parameter.
The thermal process goes in an energy pile, as in a borehole heat exchanger, in different stages: heat transfer through the ground, conduction through pile concrete and heat exchanger pipes, and convection in the fluid and at the interface with the inner surface of the pipes (Figure 2).
amount of thermal energy. Considering that thermal ing a factor to the discharging needs. ) and the storage capacity (Cap). In the would be 350 kWh (70 kW during 5 hours). These specifi- Figure 2) and 70 kW for discharging. From it, a limiting will assure the 43.75 kW required for the charging. It can enough power to maintain the storage power.
Conclusions Conclusions While the thermal analysis of borehole heat exchangers is specified, and their design and dimensions can be controlled to meet thermal requirements and establish the optimal system, the design of energy piles is a complex matter derived from the interaction between thermal and mechanical loads.
The results showed that the increase in the number of energy piles decreases the pile stresses but increases the displacements of the foundation to critical values. Wu et al. introduced the effect of the pile cap on the thermo-mechanical behavior of energy piles.
Sensible thermal energy storage (STES) systems involve raising the temperature of the storage material by adding heat from a source or a heat transfer fluid (HTF), thereby increasing its internal energy. STES systems have found practical application across a wide temperature range, spanning from 120 °C to 1250 °C [12].
Simultaneous charging and discharging (SCD) of the latent thermal energy storage (LTES) can improve the flexibility of solar thermal systems and ensure the continuity of energy supply. Experiments and numerical simulation are conducted in this study to reveal the SCD thermal behavior of LTES device using flat micro-heat pipe array–metal foam composite …
The evolution of thermocline in the TES tank equipped with the parallel-disks diffuser suggests that for well-insulated large volume storage tanks and with high charging flow rates, a cluster of parallel-disks diffusers guarantee a low momentum induced mixing, resulting in a small TLT and consequently, and can pave the way for a high storage thermal performance.
The methodology is divided into 4 steps covering: (i) description of the thermal process or application, (ii) definition of the specifications to be met by the TES system, (iii)...
In order to reduce the operation temperature of the charging pile, this paper proposed a fin and ultra-thin heat pipes (UTHPs) hybrid heat dissipation system for the direct-current (DC)...
In this paper, the energy pile was simplified as a finite-length solid cylindrical heat source, and an analytical model was established for layered heat transfer of energy piles …
The global energy demand has been escalating due to the increased reliance on fossil fuels. Nevertheless, the environmental consequences have led to a decrease in the utilization of fossil fuels, while the use of passive methods, renewable energy, energy storage, and electric cars has increased [1], [2].Thermal energy technologies are crucial in many solar …
The methodology is divided into 4 steps covering: (i) description of the thermal process or application, (ii) definition of the specifications to be met by the TES system, (iii)...
It is found that the thermal efficiency improves significantly by increasing the number of pipes inside the piles and by adding thermally conductive materials to the concrete within acceptable …
Experimental analysis to improve charge/discharge of thermal energy storage in phase change materials using helical coil and porous metal foam
It is found that the thermal efficiency improves significantly by increasing the number of pipes inside the piles and by adding thermally conductive materials to the concrete within acceptable limits. Besides, this paper reviews most of the studies conducted on optimizing vertical ground heat exchangers coupled with heat pumps.
Finally, the thermal efficiency η characterises the capability of the igniter to transfer the primary energy to the inner chamber medium as thermal energy and is defined as the ratio between the released (thermal) energy Er and the supplied (electric) energy Es : = EP η Er Es (3) 3.3. Test Campaign The test campaign is built by varying each operating parameter, one at a time, …
The latent heat thermal energy storage (LHTES) unit offers a versatile solution for storing waste heat and solar thermal energy across various temperature ranges. Despite its potential, limited experimental research has been conducted on LHTES units operating at low temperature ranges. This study addresses this gap by experimentally investigating the …
Unsaturated soil layers are advantageous for thermal energy storage due to enhanced convective heat transfer during injection associated with vapor diffusion and favorable insulation properties ...
Through in situ experiments and a simulation algorithm, the research investigated the heat transmission characteristics of the deeply buried pipe energy pile group and …
Energy piles have recently emerged as a viable alternative to borehole heat exchangers, but their energy efficiency has so far seen little research. In this work, a finite element numerical model is developed for the accurate 3D analysis of transient diffusive and convective heat exchange phenomena taking place in geothermal structures.
Energy storage needs to account for the intermittence of solar radiation if solar energy is to be used to answer the heat demands of buildings. Energy piles, which embed thermal loops into the pile body, have been used as heat exchangers in ground source heat pump systems to replace traditional boreholes. Therefore, it is proposed to store ...
DOI: 10.3390/pr11051561 Corpus ID: 258811493; Energy Storage Charging Pile Management Based on Internet of Things Technology for Electric Vehicles @article{Li2023EnergySC, title={Energy Storage Charging Pile Management Based on Internet of Things Technology for Electric Vehicles}, author={Zhaiyan Li and Xuliang Wu and Shen Zhang …
Sensible thermal energy storage (STES) systems involve raising the temperature of the storage material by adding heat from a source or a heat transfer fluid …
Energy storage pile foundations are being developed for storing renewable energy by utilizing compressed air energy storage technology. Previous studies on isolated piles indicate...
In this paper, the energy pile was simplified as a finite-length solid cylindrical heat source, and an analytical model was established for layered heat transfer of energy piles considering the interfacial thermal resistance effect.
Experimental analysis to improve charge/discharge of thermal energy storage in phase change materials using helical coil and porous metal foam
Energy piles have recently emerged as a viable alternative to borehole heat exchangers, but their energy efficiency has so far seen little research. In this work, a finite element numerical model …
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Thermal energy storage (TES) can be used to ensure the continuity of many thermal processes due to the temporal difference between energy supply and utilization in energy systems. 1, 2 TES has been widely used to achieve …
Energy storage pile foundations are being developed for storing renewable energy by utilizing compressed air energy storage technology. Previous studies on isolated piles indicate...
In order to reduce the operation temperature of the charging pile, this paper proposed a fin and ultra-thin heat pipes (UTHPs) hybrid heat dissipation system for the direct …
Thermal energy storage (TES) ... Each operation was composed of several steps, briefly described as follows (charging as example). (1) Preparation: the water quantity was ensured to be sufficient inside both water tanks. The closed loops for water heating and cooling were then turned on. (2) Filling-up: once the temperature set points in water tanks were …
Through in situ experiments and a simulation algorithm, the research investigated the heat transmission characteristics of the deeply buried pipe energy pile group and optimized different intermittent operation schemes.
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