Article
Thermodynamics
Jiahao Liu, Yining Fan, Qimiao Xie
Summary: This paper investigates the feasibility of using transformer oil to develop an oil-immersed battery thermal management system. Through model-scale experiments and theoretical analysis, it is found that stationary transformer oil can effectively cool the battery and reduce temperature inhomogeneity. Increasing oil flow rate can improve the cooling performance, but excessive flow rate will increase power consumption.
APPLIED THERMAL ENGINEERING
(2022)
Article
Thermodynamics
Johannes Kohler Mendizabal, Mahsa Montazeri, David Huitink, Nenad Miljkovic
Summary: The power densification of magnetic converters is hindered by the ineffective heat removal. The existing thermal management technologies for PCB transformers have limitations in improving overall thermal conductance and reducing temperature gradients. Direct liquid cooling technique reduces thermal resistances and temperature gradients. The choice between Novec 7300 and ethylene glycol depends on flow rate, pressure drop, and pumping power.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2022)
Article
Thermodynamics
Luyao Zhao, Wei Li, Guoyang Wang, Wenmin Cheng, Mingyi Chen
Summary: This research develops a novel hybrid battery thermal management system that combines direct liquid cooling with forced air cooling. Numerical simulations are conducted to analyze the effects of gap spacing, number of cooling pipelines, liquid flowing rate, and fan position on the cooling effects. The findings indicate the optimal configuration for the system, including a 5-mm spacing between the battery and liquid-cooling jacket, a double pipeline liquid-cooling structure, and a horizontal parallel flow of liquid coolant and air. The BTMS achieves good heat dissipation at a 4-C discharge rate and has the advantage of fire suppression in electric vehicles.
APPLIED THERMAL ENGINEERING
(2023)
Article
Instruments & Instrumentation
Gian Piero Malfense Fierro, Francesco Flora, Marco Boccaccio, Michele Meo
Summary: The study developed a novel real-time low-cost automated heating and cooling thermographic system with precise control over heating and cooling. By conducting experiments on composite material samples, the system's potential was showcased. The simulated heating and cooling process played a significant role in determining the best thermal profile sections.
INFRARED PHYSICS & TECHNOLOGY
(2021)
Article
Engineering, Electrical & Electronic
Shan Liu, Zhanbing Yue, Junyi Hou, Rui Li, Shan Gao, Hang Wang, Jianhui Zhou, Binxian Lu
Summary: This paper proposes a new method of cooling the epoxy resin impregnated paper (ERIP) high voltage direct current bushing using de-ionized water to resolve the overheating issues. A prototype of the de-ionized water cooling based ERIP (DIWC-ERIP) bushing is designed and built. Measurements and simulations show that the DIWC-ERIP bushing has better heat distribution and significantly lowers hotspot temperatures compared to other cooling schemes.
IEEE TRANSACTIONS ON POWER DELIVERY
(2023)
Article
Engineering, Electrical & Electronic
Shan Liu, Zhanbing Yue, Junyi Hou, Rui Li, Shan Gao, Hang Wang, Jianhui Zhou, Binxian Lu
Summary: This paper proposes a new method based on cooling of de-ionized water to solve the overheating problem of epoxy resin impregnated paper (ERIP) high voltage direct current bushing. The temperature distribution of the DIWC-ERIP bushing is measured and simulated, and the results show that the cooling effect of de-ionized water can effectively reduce the hotspot temperature and improve the heat distribution characteristics.
IEEE TRANSACTIONS ON POWER DELIVERY
(2023)
Article
Thermodynamics
Yun-Zhi Ling, Xiao-Hui She, Xiao-Song Zhang, Ting-Ting Chen, Xin-Ru Lin, Jun-Kai Feng
Summary: The current trend of miniaturisation and design flexibility poses challenges to thermal management systems. This study focused on a PCM-based thermal management system combined with a 3D-PHP and investigated its performance. The results showed that a 3D-PHP charged with methanol at a filling ratio of 34% exhibited the highest cooling efficiency.
APPLIED THERMAL ENGINEERING
(2022)
Article
Energy & Fuels
Jiale Peng, Chao Deng, Fulong Wei, Siqi Ding, Run Hu, Xiaobing Luo
Summary: A hybrid thermal management system using liquid cooling and phase change material (PCM) is proposed in this study to extend the workable time of downhole electronics, which are prone to failure in extreme thermal environments. The performance of this system is investigated through transient flow and heat transfer simulation, showing an error of less than 6.7% when compared with reported experimental results. The results indicate that the hybrid thermal management system increases the operating time of the electronics from 230 min to 450 min and reduces the maximum temperature difference between the electronics and PCM from 30 degrees C to 2 degrees C. The effect of flow rate, spiral pipe spacing, heating power, and ambient temperature on the temperature control performance is also explored.
JOURNAL OF ENERGY STORAGE
(2023)
Article
Thermodynamics
Wencan Zhang, Weijian Wan, Weixiong Wu, Zhongbo Zhang, Xiao Qi
Summary: This study establishes a prediction model to reveal the internal temperature of lithium-ion batteries under various boundary conditions. Internal and surface temperatures are obtained by inserting thermocouples, and the thermal network method is used to calculate the battery internal temperature under different cooling modes. Experimental data verifies the accuracy of the model and highlights the importance of internal temperature.
APPLIED THERMAL ENGINEERING
(2022)
Article
Multidisciplinary Sciences
Lei Fang, Junren Li, Ming Zhao, Li Tan, Jian-Guang Lou
Summary: The study develops a machine learning model to learn substructures from a large reaction dataset, aiming to achieve chemist-like intuitions. The model improves on previous approaches and provides additional insights for decision-making in retrosynthesis analysis.
NATURE COMMUNICATIONS
(2023)
Review
Chemistry, Multidisciplinary
Cristian Olmo, Cristina Mendez, Pedro J. Quintanilla, Felix Ortiz, Carlos J. Renedo, Alfredo Ortiz
Summary: Nanofluids, as a coolant and dielectric medium in transformers, have shown promising application potential compared to traditional dielectric oils. Research has shown that nanofluids can enhance thermal conductivity and dielectric strength, as well as improve their stability over time. However, further research is needed to ensure the stability of nanofluids for practical use.
Article
Thermodynamics
Jiahao Liu, Yining Fan, Manjiang Yang, Jinhui Wang, Qimiao Xie
Summary: This paper proposes an oil-immersed battery thermal management system to reduce battery temperature and improve its thermal safety. Experimental results show that insulating oils, such as transformer oil and silicon oil, have better cooling effectiveness than natural convection. The transformer oil outperforms silicon oil in terms of cooling and temperature homogenization. The feasibility of the self-designed oil-immersed battery cooling system is verified, providing guidance for the development of more efficient liquid cooling systems in the future.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2022)
Article
Thermodynamics
F. Todd Davidson, David Helmer, Collin Parker, Lee Cox, Kalen Kahn, Christopher J. Elkins, John P. Clark, Nathan Humbert, Bret P. Van Poppel, Michael J. Benson
Summary: This study reports the results of paired experiments for the aft section of a complex internal cooling flow within a gas turbine vane using Magnetic Resonance Velocimetry (MRV) and steady-state Infrared (IR) thermography. The results provide important information about flow distribution, impingement hole performance, and cross flow effects, which are crucial for the study of vane cooling.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2022)
Article
Engineering, Electrical & Electronic
M. M. Oliveira, L. H. Medeiros, A. M. Kaminski Jr, C. E. G. Falcao, R. C. Beltrame, V. C. Bender, T. B. Marchesan, M. A. Marin
Summary: This article introduces a thermal-hydraulic model for predicting and studying the thermal behavior of power transformers. The model determines the complete oil flow and temperature distributions over the magnetic core, windings, and radiators. The validation results show that the model accurately describes the flow and temperature fields of the transformer.
INTERNATIONAL JOURNAL OF ELECTRICAL POWER & ENERGY SYSTEMS
(2023)
Article
Thermodynamics
Alireza Qaderi, Farzad Veysi
Summary: Water-nano encapsulated phase change material (water-NEPCM) is a promising coolant made from PCM nano capsules dispersed in water. This study investigated the thermal management system of an 18650 Li-ion battery pack using water-NEPCM. The results showed that water-NEPCM can significantly lower the battery cell's temperatures, increase temperature uniformity, and affect the Li-ion concentration and voltage.
Review
Engineering, Electrical & Electronic
Ehsan Mazaheri-Tehrani, Jawad Faiz
Summary: Flux-based fault diagnosis methods have gained increasing attention for their potential diagnostic capabilities and ability to overcome weaknesses of traditional methods. This study reviews recent literature on these methods, discusses the strengths and limitations, and classifies flux-based approaches based on the type of utilized flux. Common faults in induction machines and permanent magnet machines are considered, and research gaps are identified for future research suggestions.
IET ELECTRIC POWER APPLICATIONS
(2022)
Review
Engineering, Electrical & Electronic
Sina Khalesidoost, Jawad Faiz, Ehsan Mazaheri-Tehrani
Summary: This paper reviews the state-of-the-art of thermal modelling techniques in permanent magnet (PM) machines and provides a detailed comparison of these techniques. The paper first discusses the fundamental concepts of heat transfer and sources of heat in PM machines, and then introduces and compares different thermal modelling techniques. Finally, the utilization of these models in the thermal design, control, and monitoring of PM machines is studied.
IET SCIENCE MEASUREMENT & TECHNOLOGY
(2022)
Article
Computer Science, Information Systems
Saeed Lotfifard, Donya Nojavanzadeh, Zhenwei Liu, Ali Saberi, Anton A. Stoorvogel
Summary: This article proposes a distributed voltage control strategy for multiterminal high-voltage dc systems, which achieves fair power sharing among converters. A mathematical model is established to represent the dynamics of converters in the systems. A distributed cooperative voltage control scheme is developed, where each converter communicates with the neighboring converters to regulate the voltage of the pilot bus. The proposed method is robust against communication systems failures, multiplicative noise in communication network, and degradations.
IEEE SYSTEMS JOURNAL
(2022)
Article
Energy & Fuels
Gholamreza Davarpanah, Jawad Faiz, Sajjad Mohammadi, James L. Kirtley
Summary: This paper presents a new self-starting technique for two-phase switched reluctance motors (SRMs) that offers higher efficiency and better performance compared to previous methods. Experimental results and finite element analysis confirm the advantages of the proposed topology.
IEEE TRANSACTIONS ON ENERGY CONVERSION
(2022)
Article
Chemistry, Multidisciplinary
Mohammadreza Askari, Ahmad Jafari, Feridun Esmaeilzadeh, Mohammad Khorram, Amir H. Mohammadi
Summary: In this study, the kinetics of supercritical fluid extraction of lipid from Nannochloropsis oculata using supercritical CO2 were investigated. The effects of temperature, pressure, and the co-solvent n-hexane were studied. The results show that temperature and pressure have opposite effects on the kinetic constant of lipid extraction, while the addition of n-hexane improves both the yield and the rate of extraction.
Article
Engineering, Electrical & Electronic
Arash Abyaz, Mohammad Hamed Samimi, Amir Abbas Shayegani Akmal
Summary: Condition monitoring of generators is crucial to ensure system stability and reduce outages. The partial discharge (PD) test is an effective tool for diagnosing insulation defects in generators. However, correlating the measurement results with the PD charge in generator windings is challenging, making it difficult to set a specific threshold for harmful PD activities. This paper presents a finite element method (FEM)-based model that accurately models PD pulse propagation in a wide frequency range and validates it through laboratory tests. The proposed model provides valuable insights for interpreting PD test results.
IEEE TRANSACTIONS ON POWER DELIVERY
(2023)
Article
Engineering, Electrical & Electronic
Mehrage Ghods, Jawad Faiz, Ehsan Rashipour, Mohammad Amin Bazrafshan, Mohammad Reza Besmi
Summary: This article introduces a special permanent magnet generator structure suitable for small-scale wind turbine generators, which has the advantages of high torque density, lightweight, and high efficiency. At the same time, an Equivalent-Magnetic-Network (EMN) model is established to accurately predict the behavior of flux lines and operating quantities of the structure, and the validity of the model is verified by comparing with finite element and experimental results.
IET ELECTRIC POWER APPLICATIONS
(2023)
Article
Engineering, Electrical & Electronic
Mehrage Ghods, Jawad Faiz, Hamed Gorginpour, Mohammad Amin Bazrafshan, Jonas Kristiansen Noland
Summary: This article presents a new variable-reluctance fractional-slot V-shaped VPM machine, along with an innovative equivalent magnetic network model and conformal mapping method, to improve the design process and performance prediction. Compared to traditional PMSMs, this machine has higher torque density and lower torque ripple, while enhancing flux linkage and power factor.
IEEE TRANSACTIONS ON TRANSPORTATION ELECTRIFICATION
(2023)
Article
Engineering, Electrical & Electronic
Mohammad Hamed Samimi, Jawad Faiz, Jafar Ghasemi Parchini
Summary: Frequency response analysis (FRA) provides valuable information on internal electrical and mechanical faults in a transformer. This paper focuses on using numerical indices for the evaluation of FRA to diagnose the turn-to-turn fault (TTF) severity of the transformer winding. The experimental and simulation results demonstrate that the numerical indices can determine the TTF severity by assessing the FRA results in a transformer winding.
ELECTRIC POWER COMPONENTS AND SYSTEMS
(2023)
Article
Engineering, Electrical & Electronic
Ehsan Rahmkhoda, Jawad Faiz, Moein Abedini
Summary: Faults in the power system should be detected as soon as possible to prevent destructive damage to system equipment. Loss-of-excitation (LOE) in the excitation system of a synchronous generator can have harmful effects on the generator and power system. Conventional techniques for detecting LOE fault based on impedance measurement may not always be accurate, especially with the presence of flexible alternating current transmission system devices. This article proposes an algorithm that uses intelligent methods to detect LOE faults reliably and quickly, even in the presence or absence of a unified power flow compensator (UPFC), preventing maloperation of the protection system.
ELECTRIC POWER COMPONENTS AND SYSTEMS
(2023)
Article
Energy & Fuels
Mehrage Ghods, Hamed Gorginpour, Jawad Faiz, Mohammad Amin Bazrafshan, Mohammad Sedigh Toulabi
Summary: This paper presents a fractional-slot spoke-array Vernier-PM machine with a special rotor structure for small scale electric-vehicles. The advantages of this machine include high torque-density, low weight, torque-speed curve with a wide constant torque region, promising efficiency and power-factor. An equivalent-magnetic-network (EMN) model is developed to accurately predict the behavior and operating quantities of the proposed structure.
IEEE TRANSACTIONS ON ENERGY CONVERSION
(2023)
Article
Automation & Control Systems
Pouyan Pourhadi Abkenar, Mohammad Hamed Samimi, Alinaghi Marzoughi, Vahid Samavatian, Hossein Iman-Eini, Yousef Naghibzadeh
Summary: This article presents a novel low-cost, single-switch, high-step-up resonant dc-dc converter with high reliability. The proposed converter topology has a simple structure and a low count of components, achieving a low ripple input current characteristic. The circuit operates in the soft-switching condition, reducing the switching losses, and employs film capacitors instead of electrolytic capacitors to improve size and reliability. The article discusses the operational principle, steady-state analysis, and design considerations, and validates the theoretical equations through experiments.
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
(2023)
Article
Automation & Control Systems
Zahra Masoumi, Bijan Moaveni, Sayed Mohammad Mousavi Gazafrudi, Jawad Faiz
Summary: This article presents a signal-model based fault detection, isolation, and estimation approach for diagnosing RCSAW faults in synchronous generators (SGs) by estimating the eigenvalues. The subspace identification method is used to estimate the state matrix eigenvalues, and a form of the characteristic equation is introduced for fault diagnosis of SGs under linear and nonlinear loads. Stator and field currents and voltages, as well as rotor speed, are used for fault diagnosis. The effectiveness of the proposed method is demonstrated through simulation and experimental results on a salient-pole SG in Iran-Safir (ER24) diesel-electric locomotives.
IEEE TRANSACTIONS ON INDUSTRIAL INFORMATICS
(2023)
Review
Energy & Fuels
Farrokh Aminifar, Moein Abedini, Turaj Amraee, Peyman Jafarian, Mohammad Hamed Samimi, Mohammad Shahidehpour
Summary: Power system protection and asset management have long been areas of interest for researchers, but they face unresolved technical challenges. The integration of renewable energy, climate change, cyberattacks, and limited investments have further complicated the situation, while advanced technologies such as machine learning offer unprecedented opportunities. However, there are still barriers and challenges to the widespread application of these techniques in real-world practices.
ENERGY SYSTEMS-OPTIMIZATION MODELING SIMULATION AND ECONOMIC ASPECTS
(2022)
