Article
Thermodynamics
A. Sathishkumar, M. Cheralathan
Summary: The present study investigates the performance of a low-capacity energy storage tank filled with spherical capsules containing nano-enhanced phase change material (nano-PCM) under different heat transfer fluid (HTF) conditions. The study analyzes the influence of HTF inlet temperature and volumetric flow rates on the charging and discharging time of the energy storage tank. It also examines the reduction in charging and discharging time and the amount of latent heat energy stored. The study finds that the dispersion of functionalized graphene nano-platelets (f-GNP) reduces the specific energy consumption of the nano-PCM. Controlling the flow rate of HTF and its inlet temperature can achieve the desired output temperature and average melting rate in practical applications.
Article
Thermodynamics
Bowen Xu, Shilei Lu, Ran Wang, Xue Zhai, Minchao Fan, Wei Jia, Haibing Du
Summary: Exergy analysis provides theoretical guidance for the cascaded latent heat storage system (CLHSS), but the analysis of charging-discharging processes has two problems; this paper solves these problems by revealing exergy flow paths, deriving overall exergy efficiency, and modifying models with constraints.
Article
Green & Sustainable Science & Technology
Mebrouk Benbrika, Mohamed Teggar, Muslum Arici, Kamal A. R. Ismail, Said Bouabdallah, El-Hacene Mezaache
Summary: The study investigated thermal charging and discharging processes of a phase change material dispersed with graphene nanoplatelets in a horizontal cylinder for thermal energy storage. It was found that the presence of GN expedited the charging time and solidification time, but led to a reduction in thermal storage capacity.
SUSTAINABLE ENERGY TECHNOLOGIES AND ASSESSMENTS
(2021)
Article
Thermodynamics
Lorenzo S. Correa, Andrew Rowe, Paulo Trevizoli
Summary: This paper proposes a mathematical model to simulate the heat transfer and thermodynamic cycle of a thermomagnetic motor, and optimizes the motor design to minimize entropy generation and back work ratio. Gadolinium is used as the magnetic material, and constraints such as heat exchanger length, spring constant, mass flow rate, and heat source temperature are considered.
APPLIED THERMAL ENGINEERING
(2023)
Article
Thermodynamics
Javid Zamani, Ali Keshavarz
Summary: Nowadays, the world is facing an energy crisis, with residential buildings in developed countries accounting for a significant portion of global energy demand. To achieve sustainable energy systems, it is crucial to reduce energy consumption in this sector. The use of phase change materials (PCMs) in energy systems is identified as one of the feasible solutions. This study focuses on investigating the application of PCMs in a dual-pipe latent heat exchanger system for thermal energy storage, with the aim of optimizing the charging and discharging operations to enhance energy efficiency and minimize exergy destruction.
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
(2023)
Article
Thermodynamics
Can Xu, Ming Liu, Haiyu Tang, Jinshi Wang, Junjie Yan
Summary: The evolution phenomenon and irreversibility of the thermocline storage tank (TCST) during time-varying charging parameters processes are studied through numerical simulations. The results show that the changes in charging temperature and mass flow rate have significant effects on the thermocline thickness and thermodynamic performance of the tanks. When the charging temperature difference exceeds 10 degrees C, the thermocline thickness and entropy generation rate increase remarkably, while the exergy efficiency decreases considerably.
APPLIED THERMAL ENGINEERING
(2023)
Article
Thermodynamics
Hitesh Khurana, Rudrodip Majumdar, Sandip K. Saha
Summary: The geometrical shapes of thermal energy storage and the configurations of immersed discharging coils have a significant impact on the effectiveness of low-to-medium temperature hot water applications. This study uses a three-dimensional numerical model to analyze the thermal characteristics of three storage configurations for simultaneous charging and discharging. Results show that the paraboloidal tank with a conical discharging coil configuration exhibits the best system reliability and energy management, leading to more efficient heat dispatch controllability.
APPLIED THERMAL ENGINEERING
(2023)
Article
Thermodynamics
Meng Yu, Chunwei Zhang, Yubin Fan, Xuejun Zhang, Yang Zhao
Summary: This paper introduced a single-stage air source heat pump system combined with a novel phase change material storage device to improve heating performance under extreme conditions in cold regions. By controlling the charging time, the system could reach steady state in 6 days and provide sufficient heat for continuous heating for 10 hours.
APPLIED THERMAL ENGINEERING
(2021)
Article
Physics, Fluids & Plasmas
Tanmoy Biswas, A. de Oliveira Junior, Michal Horodecki, Kamil Korzekwa
Summary: This paper derives a version of the fluctuation-dissipation theorem within a resource-theoretic framework, providing a connection between the response of a system subject to perturbation and the fluctuations associated with observables in equilibrium. The results enable the optimal performance analysis of thermodynamic protocols for quantum states with coherence between different energy eigenstates.
Article
Transportation Science & Technology
Bo Lin, Bissan Ghaddar, Jatin Nathwani
Summary: This paper investigates the EV routing problem with time windows and time-variant electricity prices to optimize the routing of an EV fleet and the charging/discharging schedule to benefit from storing and injecting energy to the grid at different price periods. The proposed model aims to reduce energy costs and potentially generate profits by utilizing energy storage capabilities of EVs.
TRANSPORTATION RESEARCH PART C-EMERGING TECHNOLOGIES
(2021)
Article
Engineering, Environmental
Alberto Maria Gambelli, Federico Rossi
Summary: In this study, methane hydrates were analyzed for their thermodynamic and kinetic properties in the presence of fresh water and a pure quartz porous medium. The Labile Clusters Theory was used to calculate the hydrate formation rate as a first-order chemical kinetic equation, providing insights into the time dependence of the process. Pressure variations were also discussed, revealing consistent similarities with other parameters and allowing for a detailed characterization of the entire process.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Green & Sustainable Science & Technology
Sumeet Kumar Dubey, K. Ravi Kumar
Summary: This study provides a detailed analysis of the energy absorption and desorption of a metal hydride suitable for high temperature in a dual bed metal hydride-based thermal energy storage system. The effects of the number of heat transfer fluid tubes and different aspect ratio geometry on the energy absorption characteristics and heat transfer phenomenon are studied. The outcomes of this study are crucial for the design of metal hydride-based thermochemical energy storage systems for process heating and power generation.
SUSTAINABLE ENERGY TECHNOLOGIES AND ASSESSMENTS
(2022)
Article
Green & Sustainable Science & Technology
Gurpreet Singh Sodhi, P. Muthukumar
Summary: This study presents a numerical model of a vertical shell and tube latent heat storage system, validated with experimental data, and analyzes the performance of single PCM and multiple PCM systems. The results show that the multi-PCM system has better charging and discharging performances compared to the single PCM system, with a significant improvement in specific power. By employing a compound enhancement technique, a reduction in charging and discharging time over the single PCM system is achieved.
Article
Thermodynamics
D. L. Yang, G. H. Tang, Q. Sheng, X. L. Li, Y. H. Fan, Y. L. He, K. H. Luo
Summary: This study investigates the effects of charging/discharging insufficiency on compressed carbon dioxide energy storage systems from the viewpoint of transient thermodynamic cycles. The results demonstrate that insufficiency significantly reduces the energy storage density, efficiency, and power output of the system, highlighting the importance of understanding charging and discharging in integrated renewable energy systems.
Article
Energy & Fuels
Biao Xiang, Xiang Wang, Wai On Wong
Summary: Flywheel energy storage system (FESS) is an energy conversion device with high requirements on power capacity, charging efficiency and output precision. This study proposes an observation control model to mitigate disturbance load torque during the charging process and a compound control model to improve response speed and output voltage precision during the discharging process of magnetically suspended FESS (MS-FESS). Simulations and experiments show improved charging efficiency and output voltage precision using the proposed control models.
JOURNAL OF ENERGY STORAGE
(2022)
Article
Energy & Fuels
Shitong Fang, Houfan Du, Tao Yan, Keyu Chen, Zhiyuan Li, Xiaoqing Ma, Zhihui Lai, Shengxi Zhou
Summary: This paper proposes a new type of nonlinear VIV energy harvester (ANVEH) that compensates for the decrease in peak energy output at low wind speeds by introducing an auxiliary structure. Theoretical and experimental results show that ANVEH performs better than traditional nonlinear VIV energy harvesters under various system parameter variations.
Article
Energy & Fuels
Wei Jiang, Shuo Zhang, Teng Wang, Yufei Zhang, Aimin Sha, Jingjing Xiao, Dongdong Yuan
Summary: A standardized method was developed to evaluate the availability of solar energy resources in road areas, which combined the Analytic Hierarchy Process (AHP) and the Geographic Information System (GIS). By analyzing critical factors and using a multi-indicator evaluation method, the method accurately evaluated the utilization of solar energy resources and guided the optimal location selection for road photovoltaic (PV) projects. The results provided guidance for the application of road PV projects and site selection for route corridors worldwide, promoting the integration of transportation and energy.
Article
Energy & Fuels
Chang Liu, Jacob A. Wrubel, Elliot Padgett, Guido Bender
Summary: The study investigates the effects of coating defects on the performance of the anode porous transport layer (PTL) in water electrolyzers. The results show that an increasing fraction of uncoated regions on the PTL leads to decreased cell performance, with continuous uncoated regions having a more severe impact compared to multiple thin uncoated strips.
Article
Energy & Fuels
Marcos Tostado-Veliz, Xiaolong Jin, Rohit Bhakar, Francisco Jurado
Summary: In this paper, a coordinated charging price mechanism for clusters of parking lots is proposed. The research shows that enabling vehicle-to-grid characteristics can bring significant economic benefits for users and the cluster coordinator, and vehicle-to-grid impacts noticeably on the risk-averse character of the uncertainty-aware strategies. The developed pricing mechanism can reduce the cost for users, avoiding to directly translate the energy cost to charging points.
Article
Energy & Fuels
Duan Kang
Summary: Building an energy superpower is a key strategy for China and a long-term goal for other countries. This study proposes an evaluation system and index for measuring energy superpower, and finds that China has significantly improved its ranking over the past 21 years, surpassing other countries.
Article
Energy & Fuels
Fucheng Deng, Yifei Wang, Xiaosen Li, Gang Li, Yi Wang, Bin Huang
Summary: This study investigated the synergistic blockage mechanism of sand and hydrate in gravel filling layer and the evolution of permeability in the layer. Experimental models and modified permeability models were established to analyze the effects of sand particles and hydrate formation on permeability. The study provided valuable insights for the safe and efficient exploitation of hydrate reservoirs.
Article
Energy & Fuels
Hao Wang, Xiwen Chen, Natan Vital, Edward Duffy, Abolfazl Razi
Summary: This study proposes a HVAC energy optimization model based on deep reinforcement learning algorithm. It achieves 37% energy savings and ensures thermal comfort for open office buildings. The model has a low complexity, uses a few controllable factors, and has a short training time with good generalizability.
Article
Energy & Fuels
Moyue Cong, Yongzhuo Gao, Weidong Wang, Long He, Xiwang Mao, Yi Long, Wei Dong
Summary: This study introduces a multi-strategy ultra-wideband energy harvesting device that achieves high power output without the need for external power input. By utilizing asymmetry, stagger array, magnetic coupling, and nonlinearity strategies, the device maintains a stable output voltage and high power density output at non-resonant frequencies. Temperature and humidity monitoring are performed using Bluetooth sensors to adaptively assess the device.
Article
Energy & Fuels
Tianshu Dong, Xiudong Duan, Yuanyuan Huang, Danji Huang, Yingdong Luo, Ziyu Liu, Xiaomeng Ai, Jiakun Fang, Chaolong Song
Summary: Electrochemical water splitting is crucial for hydrogen production, and improving the hydrogen separation rate from the electrode is essential for enhancing water electrolyzer performance. However, issues such as air bubble adhesion to the electrode plate hinder the process. Therefore, a methodology to investigate the two-phase flow within the electrolyzer is in high demand. This study proposes using a microfluidic system as a simulator for the electrolyzer and optimizing the two-phase flow by manipulating the micro-structure of the flow.
Article
Energy & Fuels
Shuo Han, Yifan Yuan, Mengjiao He, Ziwen Zhao, Beibei Xu, Diyi Chen, Jakub Jurasz
Summary: Giving full play to the flexibility of hydropower and integrating more variable renewable energy is of great significance for accelerating the transformation of China's power energy system. This study proposes a novel day-ahead scheduling model that considers the flexibility limited by irregular vibration zones (VZs) and the probability of flexibility shortage in a hydropower-variable renewable energy hybrid generation system. The model is applied to a real hydropower station and effectively improves the flexibility supply capacity of hydropower, especially during heavy load demand in flood season.
Article
Energy & Fuels
Zhen Wang, Kangqi Fan, Shizhong Zhao, Shuxin Wu, Xuan Zhang, Kangjia Zhai, Zhiqi Li, Hua He
Summary: This study developed a high-performance rotary energy harvester (AI-REH) inspired by archery, which efficiently accumulates and releases ultralow-frequency vibration energy. By utilizing a magnetic coupling strategy and an accumulator spring, the AI-REH achieves significantly accelerated rotor speeds and enhanced electric outputs.
Article
Energy & Fuels
Yi Yang, Qianyi Xing, Kang Wang, Caihong Li, Jianzhou Wang, Xiaojia Huang
Summary: In this study, a novel hybrid Quantile Regression (QR) model is proposed for Probabilistic Load Forecasting (PLF). The model integrates causal dilated convolution, residual connection, and Bidirectional Long Short-Term Memory (BiLSTM) for multi-scale feature extraction. In addition, a Combined Probabilistic Load Forecasting System (CPLFS) is proposed to overcome the inherent flaws of relying on a single model. Simulation results show that the hybrid QR outperforms traditional models and CPLFS exceeds the best benchmarks in terms of prediction accuracy and stability.
Article
Energy & Fuels
Wen-Jiang Zou, Young-Bae Kim, Seunghun Jung
Summary: This paper proposes a dynamic prediction model for capacity fade in vanadium redox flow batteries (VRFBs). The model accurately predicts changes in electrolyte volume and capacity fade, enhancing the competitiveness of VRFBs in energy storage applications.
Article
Energy & Fuels
Yuechao Ma, Shengtie Wang, Guangchen Liu, Guizhen Tian, Jianwei Zhang, Ruiming Liu
Summary: This paper focuses on the balance of state of charge (SOC) among multiple battery energy storage units (MBESUs) and bus voltage balance in an islanded bipolar DC microgrid. A SOC automatic balancing strategy is proposed considering the energy flow relationship and utilizing the adaptive virtual resistance algorithm. The simulation results demonstrate the effectiveness of the proposed strategy in achieving SOC balancing and decreasing bus voltage unbalance.
Article
Energy & Fuels
Raad Z. Homod, Basil Sh. Munahi, Hayder Ibrahim Mohammed, Musatafa Abbas Abbood Albadr, Aissa Abderrahmane, Jasim M. Mahdi, Mohamed Bechir Ben Hamida, Bilal Naji Alhasnawi, A. S. Albahri, Hussein Togun, Umar F. Alqsair, Zaher Mundher Yaseen
Summary: In this study, the control problem of the multiple-boiler system (MBS) is formulated as a dynamic Markov decision process and a deep clustering reinforcement learning approach is applied to obtain the optimal control policy. The proposed strategy, based on bang-bang action, shows superior response and achieves more than 32% energy saving compared to conventional fixed parameter controllers under dynamic indoor/outdoor actual conditions.