This paper presents the thermal modelling and performance predictions of high-temperature sensible heat storage (SHS) models of 50 MJ capacity designed for solar thermal power plant applications in the temperature range of 523–648 K. The SHS unit is a regenerator-type heat exchanger which stores/releases the heat on passing hot/cold heat transfer fluid …
Combining Figs. 10 and 11, it can be observed that, based on the cooperative effect of energy storage, in order to further reduce the discharge load of charging piles during peak hours, the optimized scheduling scheme transfers most of the controllable discharge load to the early morning period, thereby further reducing users' charging costs.
To optimize grid operations, concerning energy storage charging piles connected to the grid, the charging load of energy storage is shifted to nighttime to fill in the valley of the grid's baseline load. During peak electricity consumption periods, priority is given to using stored energy for electric vehicle charging.
Moreover, thermally-induced forces applied to energy piles due to compression and tension should not reach the ultimate pile capacity. The distribution of stresses and strains induced by imposed thermal loads highly depends on the degree of freedom of the pile (DOF).
In the charging and discharging process of the charging piles in the community, due to the inability to precisely control the charging time periods for users and charging piles, this paper divides a day into 48 time slots, with the control system utilizing a minimum charging and discharging control time of 30 min.
Due to the complexity of the interaction between piles and soil, full-scale in situ experiments are more practical for investigating the thermomechanical characteristics of energy piles. Some in situ experiments have been conducted to study the thermomechanical behavior of bored energy piles.
Depending on intended operational requirements or by accident, energy pile groups may be subjected to cyclic and variable thermal loadings. This study presents the results from a series of full-scale field tests of a 2 × 2 energy pile foundation.
This paper presents the thermal modelling and performance predictions of high-temperature sensible heat storage (SHS) models of 50 MJ capacity designed for solar thermal power plant applications in the temperature range of 523–648 K. The SHS unit is a regenerator-type heat exchanger which stores/releases the heat on passing hot/cold heat transfer fluid …
Depending on intended operational requirements or by accident, energy pile groups may be subjected to cyclic and variable thermal loadings. This study presents the results from a series of full-scale field tests of a 2 × 2 energy pile foundation.
Results reveal that higher-end complex models like the hypoplastic model are necessary to simulate the thermal behavior of soil. Song et al. [417] did a long-term evaluation of thermal piles...
The analysis results show that the group pile effect significantly increases the temperature up to more than 100 °C depending on the location and changes its distribution in both concrete and soil due to the heat transferred from the adjacent piles.
To reduce the temperature around the terminals and address the cooling issue for charging guns under high current, liquid cooling tubes are often added around the terminals. These tubes circulate high specific heat capacity liquids like silicone oil, water, or glycol to lower the terminal temperature, ensuring the charging gun operates properly. The internal structure of a liquid …
We have constructed a mathematical model for electric vehicle charging and discharging scheduling with the optimization objectives of minimizing the charging and discharging costs of electric vehicles and maximizing the revenue of Charging piles.
Jianghuai Yuan, Zhi Chen, Yan Zhuang, Yongli Liu, Model Test on Thermomechanical Behavior of Deeply Buried Pipe Energy Pile Under Different Temperature Loads and Mechanical Loads, Applied Sciences, 10.3390/app142210528, 14, 22, (10528), (2024).
It is concluded that a multi-objective optimization is highly recommended to enhance the dual performance of an energy pile system coupled with a heat pump using the 4E evaluation …
It is concluded that a multi-objective optimization is highly recommended to enhance the dual performance of an energy pile system coupled with a heat pump using the 4E evaluation criteria (energy, exergy, economy, and environment) while ensuring the safety of the foundation under thermal cyclic loads.
By altering the internal concrete of the piles, the heat exchange efficiency of energy piles can be maximized. Changing the filling material of PHC energy piles has a greater impact on heat transmission than altering the piles'' thermal characteristics, according to Guo''s novel analytical model of heat transfer of PHC energy piles [20].
We have constructed a mathematical model for electric vehicle charging and discharging scheduling with the optimization objectives of minimizing the charging and …
This paper presents a comprehensive review of all energy piles'' features: evaluation, design, and optimization. It interprets the complex performance of energy piles, …
This paper examines the thermal performance of pre-tensioned high strength concrete (PHC) energy piles through full-scale experiments. Thermal response tests (TRTs) and thermal performance tests (TPTs) were conducted on a PHC energy pile under different operating modes (continuous mode and intermittent mode) and temperatures (40 °C ...
It considers the attenuation of energy storage life from the aspects of cycle capacity and depth of discharge DOD (Depth Of Discharge) [13] believes that the service life of energy storage is closely related to the throughput, and prolongs the use time by limiting the daily throughput [14] fact, the operating efficiency and life decay of electrochemical energy …
Results reveal that higher-end complex models like the hypoplastic model are necessary to simulate the thermal behavior of soil. Song et al. [417] did a long-term evaluation …
We report six full-scale in situ tests on bored energy piles under heating or cooling conditions and multiple mechanical load levels in Shanghai, China. Each pile was tested with 24 h of mechanical loading, 48 h of heating or cooling, and …
This paper presents a comprehensive review of all energy piles'' features: evaluation, design, and optimization. It interprets the complex performance of energy piles, expands knowledge on their evaluation criteria and design parameters, and provides design recommendations. It also attempts to develop an approach to optimize energy piles ...
Depending on intended operational requirements or by accident, energy pile groups may be subjected to cyclic and variable thermal loadings. This study presents the results from a series …
This experimental research clarifies the advantageous effect of adding paraffin wax as the appropriate organic phase change material (PCM) to control the temperature rise of the fast charging ...
Among them, under the heating condition of the energy pile (Figure 8a), the temperature distribution in the radial direction at each depth gradually decreases from the inside to outside; the overall average temperature of the pile body increases to 22.8 °C compared with the initial temperature of 18.5 °C; thus, it increased by 4.3 °C. The maximum temperature in …
Depending on the physical phenomena in the melting and solidification processes and the heat transfer surface areas of the tube geometries, different geometries have shown high …
By altering the internal concrete of the piles, the heat exchange efficiency of energy piles can be maximized. Changing the filling material of PHC energy piles has a …
The study showed that heat transfer efficiency improved under intermittent operating mode and that cycle temperature variations significantly impacted the thermal response of energy piles. Yang et al. [24] conducted experimental studies on the thermal performance of energy piles under different temperature conditions. They reported that the ...
This paper examines the thermal performance of pre-tensioned high strength concrete (PHC) energy piles through full-scale experiments. Thermal response tests (TRTs) and thermal performance tests (TPTs) were conducted on a PHC energy pile under different …
In this study, the integrated cooling modality combining composite phase change material and liquid cooling is proposed to solve the thermal control problem of high power fast-charging piles. The temperature control performance for the power module using the proposed cooling system is experimentally assessed under various liquid flow rates ...
High-power capacitors are highly demanded in advanced electronics and power systems, where rising concerns on the operating temperatures have evoked the attention on developing highly reliable high-temperature dielectric polymers. Herein, polyetherimide (PEI) filled with highly insulating Al2O3 (AO) nanoparticles dielectric composite films have been fabricated …
To promote the clean energy utilization, electric vehicles powered by battery have been rapidly developed [1].Lithium-ion battery has become the most widely utilized dynamic storage system for electric vehicles because of its efficient charging and discharging, and long operating life [2].The high temperature and the non-uniformity both may reduce the stability …
Depending on the physical phenomena in the melting and solidification processes and the heat transfer surface areas of the tube geometries, different geometries have shown high performance in charge and discharge times. The lowest charging time was obtained for the triangle-tube designs and reduced charging time by 7.7 % to 10.4 % compared to ...
The analysis results show that the group pile effect significantly increases the temperature up to more than 100 °C depending on the location and changes its distribution in both concrete and soil due to the heat transferred from the …
We report six full-scale in situ tests on bored energy piles under heating or cooling conditions and multiple mechanical load levels in Shanghai, China. Each pile was …
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