Article
Energy & Fuels
Liang Chen, Daxiang Deng, Qixian Ma, Yingxue Yao, Xinhai Xu
Summary: Efficient cooling is crucial for high concentration photovoltaic (HCPV) cells to maintain their electrical performance and extend their lifetime. In this study, a novel microchannel heat sink with serpentine reentrant microchannels (SRM) was developed for efficient cooling of HCPV cells. The SRM design effectively reduced cell temperatures and improved temperature uniformity, resulting in increased output power and electrical efficiency for the HCPV cell module.
Article
Thermodynamics
William J. Cameron, Mussad M. Alzahrani, James Yule, Katie Shanks, K. S. Reddy, Tapas K. Mallick
Summary: High concentration photovoltaic thermal hybrids are important for meeting energy demands, and a cooling system is necessary for optimal performance. This study develops a simulation model for a concentrated photovoltaic thermal hybrid system with serpentine-based cooling. The model has been validated through indoor experimentation and the effectiveness of cooling is evaluated based on thermal stresses. The double serpentine design and copper heat sink material demonstrated the highest performance and the recommended operating temperature was maintained.
APPLIED THERMAL ENGINEERING
(2023)
Article
Energy & Fuels
Taher S. Maatallah
Summary: The analysis of a single-cell concentration photovoltaic (CPV) system incorporating pin-fins heat sinks reveals promising thermal performance and suggests practical recommendations for operation.
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
(2021)
Article
Thermodynamics
Xiao Cheng, Junjun Wu
Summary: This study designed microchannels of different widths to investigate the influence of geometry on flow boiling characteristics. It was found that the flow patterns and heat transfer coefficient varied with microchannel widths, and the narrow 50 μm microchannel was highly susceptible to triggering the critical heat flux. Flow instability showed less dependence on microchannels but strong relevance to the mass flux.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Thermodynamics
Asmaa Ahmed, Katie Shanks, Senthilarasu Sundaram, Tapas Mallick
Summary: The study compared new heat sink configurations based on a serpentine design with straight channel arrangement for high concentrator photovoltaic systems, finding that the serpentine design offers better cooling efficiency. At a concentration of 2000x, the serpentine design can maintain uniform temperature distribution in the system, achieving the highest energy and exergy efficiencies.
APPLIED THERMAL ENGINEERING
(2021)
Article
Thermodynamics
Ali H. Al-Zaidi, Mohamed M. Mahmoud, Tassos G. Karayiannis
Summary: This paper presents an experimental study on flow boiling patterns, heat transfer rates, and pressure drop in multi-microchannels evaporators made of copper and aluminium. The results showed that aluminium heat sinks have comparable thermal performance to that of copper heat sinks.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2022)
Review
Thermodynamics
Daxiang Deng, Long Zeng, Wei Sun
Summary: This paper comprehensively reviews recent advancements in flow boiling enhancement and fabrication of enhanced microchannels. It emphasizes the flow boiling enhancement performance of these enhanced microchannels in microchannel heat sinks, while also discussing their advantages and disadvantages after summarizing the classification and manufacturing methods of enhanced microchannels.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2021)
Review
Energy & Fuels
Leticia de Oliveira Santos, Paulo Cesar Marques de Carvalho, Clodoaldo de Oliveira Carvalho Filho
Summary: This article provides a review of steady-state models for calculating the operating temperature of photovoltaic (PV) cells developed since 2000. It aims to assist researchers and professionals in selecting significant parameters and suitable experimental arrangements to create accurate models. The article summarizes 33 correlations found in the literature and presents three general forms of these correlations. The main parameters affecting the operating temperature are discussed, along with their most accurate data collection methods. The strategies for obtaining the operating temperature, such as using the module back side temperature or internal sensors, for model validation purposes are also discussed.
IEEE JOURNAL OF PHOTOVOLTAICS
(2022)
Article
Thermodynamics
X. L. Wu, C. Y. Li, J. L. Yang, Y. Liu, X. H. Han
Summary: Two-phase microchannel heat sink has attracted extensive attention due to its small size, high heat transfer efficiency, good temperature uniformity, and low working fluid charge. The heat transfer performance of the heat sink is influenced by heat flux and mass flow rate, and dry-out phenomenon can occur if the mass flow rate is not reasonable. A study was conducted to explore the influence of mass flow rate and heat flux on the flow boiling heat transfer performance and flow regimes of a two-phase microchannel heat sink using R245fa as the working fluid. The results showed that dry-out became more severe with higher heat flux and no dry-out was observed within certain ranges of mass flow rate and heat flux.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2023)
Article
Environmental Sciences
Sacithra Anandaraj, Manivannan Ayyasamy, Fausto Pedro Garcia Marquez, Muthu Manokar Athikesavan
Summary: The efficiency of photovoltaic cells decreases with increasing solar irradiation. This study introduces a novel design of a thermal absorber, made of a flat spiral tube, to decrease the cell temperature and improve the efficiency of the photovoltaic thermal system (PVTS). Water and titanium oxide nanofluid are used as the working fluid in the PVTS, and the results show that cooling using these fluids significantly reduces the cell temperature and increases the electrical efficiency.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2023)
Article
Thermodynamics
Zhigang Gao, Xiaolong Shang, Junhua Bai, Yuxin Yang, Peng Li
Summary: In this study, a 3D numerical model was established to examine the heat transfer and thermal performance of a microchannel heat sink for a power module with non-uniform heat flux. The effects of the inlet location and injection angle on flow distribution and heat dissipation were investigated. The results showed that the Z30 configuration provided the best inlet location and injection angle to match the non-uniform heat flux of the power module.
APPLIED THERMAL ENGINEERING
(2023)
Article
Thermodynamics
Hesham Zaghloul, Mohamed Emam, M. A. Abdelrahman, M. F. Abd Rabbo
Summary: The study focuses on passive cooling of triple-junction solar cells using straight fins heat sink and found that the fins are effective in reducing cell temperature and increasing system efficiency under high temperatures. Environmental factors such as ambient temperature, wind speed, and concentration ratio have significant effects on the cooling system's performance and carbon emission reduction.
ENERGY CONVERSION AND MANAGEMENT
(2021)
Article
Thermodynamics
D. D. Ma, Y. X. Tang, G. D. Xia
Summary: The sinusoidal wavy microchannels with secondary channels (SWSC) show better heat removal performance in flow boiling studies compared to conventional microchannels, thanks to increased bubble nucleation induced by enlarged surface area and continuous development of thin liquid film due to the introduction of secondary channels. However, the SWSC microchannels suffer from a higher pressure drop penalty.
APPLIED THERMAL ENGINEERING
(2021)
Article
Thermodynamics
D. C. Moreira, V. S. Nascimento Jr, S. G. Kandlikar, G. Ribatski
Summary: The development of high heat flux cooling technologies has led to investigations in flow boiling in microchannels. A recent study introduced new heat sinks with asymmetric Dual-V microchannels and a tapered microgap, which demonstrated boiling inversion in flow boiling experiments using water. However, water may not meet certain cooling requirements, and the use of refrigerants is necessary. This study focused on flow boiling experiments with the Hydro-Fluoroolefin R1336mzz(Z) in copper heat sinks combined with a tapered manifold, and evaluated the effects of various parameters on heat transfer performance.
APPLIED THERMAL ENGINEERING
(2023)
Article
Engineering, Chemical
Muhammad Ibrahim, Tareq Saeed
Summary: This article investigates the cooling of photovoltaic cells using a newly designed heatsink, finding that using nanofluids can increase heat transfer coefficient but also require more pumping power. Addition of alumina nanoparticles can improve thermal efficiency, while addition of copper oxide nanoparticles can reduce it.
JOURNAL OF THE TAIWAN INSTITUTE OF CHEMICAL ENGINEERS
(2021)
Article
Thermodynamics
M. A. M. Hassan, H. M. Abd El-Hameed, Osama E. Mahmoud
HEAT AND MASS TRANSFER
(2017)
Article
Thermodynamics
Hosny Abou-Ziyan, Abdulrheem Kalender, Mohamed Shedid, Hala Abdel-Hameed
EXPERIMENTAL THERMAL AND FLUID SCIENCE
(2017)
Article
Thermodynamics
M. A. Yassin, M. H. Shedid, H. M. Abd El-Hameed, A. Basheer
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2018)
Article
Energy & Fuels
M. A. M. Hassan, H. M. Abdel-Hameed, Osama E. Mahmoud
JOURNAL OF ENERGY RESOURCES TECHNOLOGY-TRANSACTIONS OF THE ASME
(2019)
Article
Thermodynamics
Hosny Abou-Ziyan, Mohammed Ibrahim, Hala Abdel-Hameed
ENERGY CONVERSION AND MANAGEMENT
(2020)
Article
Energy & Fuels
Kareem Emara, Hossam Aliwa, Osama Ezza Abdellatif, H. M. Abd El-hameed
Summary: This study presents a novel hybrid technique for optimizing energy harvesting from solar radiation using combined cooling and heat storage mechanisms. The results show that adding phase change materials (PCM) and using nanofluids can effectively decrease the temperature of photovoltaic cells and increase electricity generation.
JOURNAL OF ENERGY STORAGE
(2022)
Article
Thermodynamics
Hussein S. Moghaieb, H. M. Abdel-Hamid, Mohamed H. Shedid, A. B. Helali
APPLIED THERMAL ENGINEERING
(2017)
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.
