查看更多>>摘要：Isothermal compressed gas energy storage (I-CGES) systems are widely recognized for their simplicity and high cycle efficiency. However, challenges such as limited energy storage density and suboptimal thermodynamic performance remain. In this study, an innovative isothermal compressed carbon dioxide energy storage (I-CCES) system is proposed, which utilizes a dual-liquid piston structure and uses carbon dioxide as the working medium, taking full advantage of the superior thermal conductivity of carbon dioxide. A comprehensive model is developed to evaluate the system performance, and the main indexes include energy storage density, round-trip efficiency and compression/expansion efficiency. The effects of ambient temperature, pressure parameters and flow rate were systematically analyzed. The results show that the system has an energy storage density of 0.404 kWh/m3, round-trip efficiency of 58.24 % and an indicated efficiency of 74.48 % under the design parameters. By optimizing the ambient temperature (296.15-300.15 K), minimum pressure (2.0-3.0 MPa) and maximum pressure (5.0-6.0 MPa), the round-trip efficiency and energy storage density can be increased to 64.54 % and 0.409 kWh/m3, respectively. It is noteworthy that the flow rate variation has a negligible effect on the efficiency, which emphasizes the robustness of the system under dynamic operating conditions.
查看更多>>摘要：This study examines the effectiveness of three controllers-Proportional-Integral (PI), Sequential quadratic programming-gradient Descent (SQP-GD), and Adaptive Neuro-Fuzzy Inference System (ANFIS)-in reducing the effects of abrupt load changes in an off-board electric vehicle (EV) charging station using an isolated dual active bridge converter (DAB) topology. The charging station uses single-phase shift modulation to transfer power from the DC grid to an electric vehicle. It works with an input of 24 V and an output of 12 V and 10 A current, following the laboratory model. The controllers, PI, SQP-GD, and ANFIS, are evaluated in the same operating conditions, and their transient settling times are measured and studied. The study shows that despite ANFIS being a contemporary controller, it is not superior to SQP-GD. PI is a mathematically proven controller, however it has a longer settling period when dealing with load disturbances. Settling times for PI are 302.89 ms and 569.03 ms, SQP-GD are 33.92 ms and 51.846 ms, and for ANFIS are 69.99 ms and 187.95 ms. The results highlight the excellent performance of SQP-GD in attaining quick settling times, making it a strong option for handling abrupt load fluctuations in off-board EV charging stations.
Mohan, A.Prakash, J. UdayaKabeel, Abd ElnabyManokar, A. Muthu...
1.1-1.12页
查看更多>>摘要：This experimental study compared the performance of a Solar Distiller (SD) with and without black-painted crab shells in Chennai, India. The findings revealed that using energy storage materials, such as crab shells and blackpainted crab shells, significantly enhanced the SD's output. Key results showed that the distilled water output was 1.68 kg for the SD, 2.4 kg for the SD with crab shells, 1.69 kg for the SD, and 2.95 kg for the SD with blackpainted crab shells. Energy efficiency increased from 17.07 % in the SD to 26.62 % with crab shells and 30.74 % with black-painted crab shells. Similarly, exergy efficiency rose from 1 % in the SD to 2.09 % with crab shells and 2.37 % with black-painted crab shells. Notably, the distilled water output in the SD with black-painted crab shells improved by 74.8 % compared to the SD without them.
查看更多>>摘要：O3-NaNi0.5Mn0.5O2 cathode with high reversible capacity are promising cathode candidates for Na-ion batteries. However, the poor cycling performance caused by layered structure collapse and side reaction with the electrolyte during charging and discharging limits the practical application of NaNi0.5Mn0.5O2. Here, we propose a synergistic strategy of stepwise calcination and surface modification to enhance structural stability and electrochemical performance of NaNi0.5Mn0.5O2 cathode. Firstly, the crystallinity and the structural stability of the synthesized cathode have been optimized by unique stepwise calcination, in which Ni0.5Mn0.5(OH)2 precursor was calcined separately at 750 degrees C for 20 h. The spacing of Na layer is enlarged and the diffusion rate of Na is increased. In addition, the interface side reactions between cathode and electrolyte are suppressed by coupling with the TiO2 surface coating, improving cycle performance while increasing capacity. As expected, the optimized sample presents a high specific capacity of 145.8 mAh & sdot;g- 1 with a high capacity retention rate of 87.4 % after 100 cycles at 1C. This work provides a novel way to develop O3 layered cathode materials for sodium-ion batteries with high capacity and long cycle life.
查看更多>>摘要：In the current electricity grids, it is becoming pivotal to install a large amount of storage capacity in order to maximize the deployment of renewable energy sources, stabilize the grid, and mitigate electricity price volatility. Engineering research focused on improving storage technologies performance aiming to improve the round-trip efficiency and increase the utilization opportunities. Besides storage implementation, power plant flexibility is pursued as well to support electricity grids in the transient stage towards a decarbonized energy mix. Recent studies have investigated the possibility of enhancing the flexibility of Combined Cycle Gas Turbine (CCGT) power plants by means of a heat pump and a cold thermal energy storage, this solution demonstrated a relevant potential, especially in those locations characterized by warm climates and volatile electricity markets. In such a situation is possible to fully exploit the cold thermal energy storage, decreasing the net power output, during storage charging in off-peak periods, and boosting it, through inlet cooling, during the most profitable periods. This paper performs a techno-economic comparison between cold thermal energy storage for gas turbines air inlet cooling and other established energy storage technologies (such as pumped hydro, batteries, compressed air, and pumped thermal storage) for time load shifting and energy arbitrage on the day ahead electricity market. The analysis is based on Linear Programming (LP) and Mixed Integer Linear Programming (MILP) models for the optimization of the dispatch. The impact of real market parameters on storage technologies performance is investigated and discussed, considering the twofold impact of storage duration on capital expenditure and the ability to exploit short peak in price. Once discussed and selected the proper sizing conventional pure storage technologies are benchmarked against the thermal storage for gas turbine, finding that the last outperforms the stand-alone Storages when the Clean Spark Spread is above 10-15<euro>/MWh.
Mousavian, Seyed Mohammad HosseinBautin, Vasily Anatolievich
1.1-1.18页
查看更多>>摘要：Rechargeable magnesium batteries (RMBs) are gaining attention as a viable alternative to lithium-ion batteries, leveraging magnesium's high volumetric capacity (3833 mAh/cm3), inherent safety due to dendrite-free operation, and cost-effectiveness stemming from its abundance. This comprehensive review explores the electrochemical fundamentals, recent material advancements, performance characteristics, key technical hurdles, and prospective applications of RMBs. Despite their promising theoretical advantages, practical implementation is impeded by challenges such as sluggish Mg2+ diffusion, anode passivation, and limited cathode-electrolyte compatibility. Innovations like nanostructured cathodes (e.g., Cu2S, Mo3S13), stable electrolytes (e.g., Mg (TFSI)2-based systems), and hybrid Mg-Li designs address these barriers. Potential applications span electric vehicles, grid-scale energy storage, aerospace, and portable electronics. Advances driven by artificial intelligence (AI) and sophisticated material engineering may accelerate their commercialization. This review highlights RMBs' potential to revolutionize sustainable energy storage and outlines a strategic roadmap for future research and industrial adoption.
查看更多>>摘要：All-solid-state supercapacitors (ASSSCs) represent longer cycling life, higher safety and improved chemical stability compared to liquid electrolyte-based supercapacitors. However, relatively low energy density and high interfaical resistance of electrode/electrolyte are still major obstacles for developing high performance ASSSCs. Herein, a high performance ASSSCs is realized based on nano-carbon silicon oxycarbide (SiCO) electrode and lithium phosphorous oxynitride (LiPON). First-principles calculations reveal that high concentration of carbon network in SiCO impedes volumetric expansion and leads to higher formation energy of the interface, doping Al in LiPON improves ion diffusion and charge transfer capability of the interface, thus enhancing electrical conductivity and cycling performance of ASSSC. The ASSSC device with the optimal carbon content of SiCO and doping strategy improved LiPON exhibits higher capacity retention of 80.88 % after 1000 cycles life. In addition, a small impedance of 172.8 S2 for SiCO/LiAlPON interface is achieved, which is obviously lower than the result of 310 S2 for SiCO/LiPON interface. This work offers an experimental and computational framework for developing novel nanomaterials-based ASSSCs.
查看更多>>摘要：Thermal energy storage wood (TESW) is a passive energy-efficient building material that effectively regulates indoor temperature and homogenizes the heat distribution. However, the energy storage performance of TESW is diminished by leakage. In addition, the flammable phase change materials incorporated within the wood are potential fire hazards. In this study, TESW with flame-retardant and anti-leakage (P9A1-UP-woodC) was prepared by impregnating wood cell lumen with polyethylene glycol (PEG), phytic acid, urea and acrylic acid, and thermally initiating cross-linking. Accordingly, the enthalpy and phase change temperature of P9A1-UP-woodC were 47.98 J g-1 and 25.07 degrees C, respectively. Meanwhile, 98.95 % of the enthalpy remained after 100 cycles. In addition, the total smoke release of P9A1-UP-woodC was reduced by 28.61 % from that of raw wood (woodC), and the production rates of CO2 and CO during the combustion process were also significantly decreased, indicating good smoke-suppressing and toxicity-reducing effects of the flame retardants. The building-energy efficiency of the TESW was simulated in Designbuilder software. This flame-retardant, leakage-resistant TESW prepared via a toxic solvent-free method can improve the safety and long-term stability of passive energy-saving materials and promotes the storage and reuse of low-grade thermal energy.
查看更多>>摘要：To address the challenges of high lifespan loss, operational imbalance, poor robustness, and the lack of consideration for time-varying delays in conventional distributed energy management strategies for battery energy storage systems (BESS), this paper proposes a distributed energy management strategy for BESS incorporating time-varying delays with an improved bipartite grouping model, balancing state of health (SOH) and state of charge (SOC) simultaneously. Firstly, a BESS response capability evaluation model is developed to balance SOH and SOC. Building on this, the bipartite grouping model is further refined to maintain this balance. Next, state feedback predictive control (SFPC) is introduced into the distributed consensus algorithm (DCA) forming a new algorithm called SFPC-DCA, with its state-space equations adjusted for time-varying delays. Then, a hierarchical response principle is devised to determine which battery groups should engage in energy management, factoring in the maximum charge/discharge power. SFPC-DCA is used for balanced energy management across the battery groups, and BESS responds to the allocated power signals. Simulations and hardware experiments confirm that the proposed strategy improves SOC and SOH balance, reduces lifespan loss, and enhances operational robustness under time-varying delays.
查看更多>>摘要：Cold store is a critical component of the cold chain and represents a significant energy-consuming segment within the entire process. Energy efficiency and consumption reduction during cold store operations can lower costs across the cold chain, enhance enterprise market competitiveness, and contribute to power grid stability. The innovative use of low-temperature phase change materials in cold store offers a novel pathway for carbon reduction in the cold chain industry, addressing the high energy consumption of traditional cold store. This topic has garnered significant attention from researchers and industry stakeholders. This paper reviews the fundamental principles, types, and characteristics of phase change cold store systems, summarizes low-temperature phase change materials suitable for application in cold store, and analyzes the current status of design and performance research on phase change cold store, encompassing both theoretical and experimental studies. Additionally, the operational control strategies and economic aspects of existing phase change cold store systems are examined. Finally, based on the current advancements in phase change cold store systems and materials, this paper proposes principles for material selection, system design, and operational optimization, while envisioning future developments and application prospects in this field.
NETL
NSTL
Elsevier