Article
Energy & Fuels
Wei Le, Mingyao Lin, Keman Lin, Lun Jia, Anchen Yang
Summary: This article proposes an enhanced air-cooling method for the rotor of axial flux machines by mounting tile-shaped fins on the inner wall of the housing. Theoretical analysis and computational fluid dynamics demonstrate that this method effectively improves the thermal performance of the rotor, which is further validated through experimental studies.
IEEE TRANSACTIONS ON ENERGY CONVERSION
(2023)
Article
Thermodynamics
Myeong Hyeon Park, Sung Chul Kim
Summary: In this study, an asymmetric lumped parameter thermal network (LPTN) model of a rotational oil-spray-cooling motor is developed. The heat loss is calculated using correlation equations and electro-magnetic analysis, and the internal temperature distribution of the motor is predicted using conjugate heat transfer and multiphase flow computational fluid dynamics (CFD) analysis. The temperature of the coil inside the motor is measured using experiments. The developed LPTN model determined that the temperature prediction errors of coil parts were 0.15% and 4.42% at the nominal and maximum speeds, respectively.
APPLIED THERMAL ENGINEERING
(2023)
Article
Engineering, Electrical & Electronic
Amitav Tikadar, Joon Woo Kim, Yogendra Joshi, Satish Kumar
Summary: This article examines a novel concept of flow-assisted latent beat-driven two-phase evaporative cooling and evaluates its electrothermal performance using computational fluid dynamics/heat transfer and electromagnetic-lumped parameter thermal network models. The study shows that this cooling method improves heat management by utilizing thin-film evaporation on the outer surface of the winding. The results demonstrate that the EC approach achieves higher thermal efficiency under certain conditions.
IEEE TRANSACTIONS ON TRANSPORTATION ELECTRIFICATION
(2022)
Article
Engineering, Electrical & Electronic
Qiushuo Chen, Ying Fan, Junlei Chen, Yutong Lei, Can Yang
Summary: This paper proposes a thermal analytical model that combines lumped-parameter thermal network (LPTN) and the thermal analysis method (AM) to address boundary condition extraction and maximum temperature calculation. The model considers heat transfer between wheel end caps and outside air, improving the accuracy of temperature rise calculation.
IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY
(2022)
Article
Energy & Fuels
Emma Arfa Grunditz, Torbjorn Thiringer, Joachim Lindstrom, Sonja Tidblad Lundmark, Mikael Alatalo
Summary: The paper evaluates and quantifies the impact of varied stator slot size on the efficiency and thermal capability of a permanent magnet synchronous machine for an electric vehicle. By decreasing the slot size while keeping other dimensions fixed, core losses reduce, winding losses increase, and a higher maximum torque is reached.
Article
Computer Science, Information Systems
Yongming Tang, Shouguang Sun, Wenfei Yu, Wei Hua
Summary: This paper focuses on the thermal analysis of a water-cooling 200 kW PMSM for a port traction electric vehicle. A fast evaluation method for a transient temperature rise in the water-cooling machine under multiple operating conditions is proposed. Different cooling structures' influence on temperature distribution is studied using a lumped parameter thermal network (LPTN) model and a three-dimensional (3D) computational fluid dynamics (CFD) model.
Article
Green & Sustainable Science & Technology
Satish Vitta
Summary: The study analyzed the energy requirements and emissions of electric vehicles, highlighting that the battery assembly process is the main contributor to emissions and indicating that a breakeven is not possible with current manufacturing technologies. It also emphasized the need for significant technological developments in electric vehicles for them to be more environmentally advantageous compared to combustion engine based cars.
SUSTAINABLE MATERIALS AND TECHNOLOGIES
(2021)
Article
Thermodynamics
Sunjin Kim, Sangwook Lee, Dong Gyun Kang, Min Soo Kim
Summary: In order to improve the stability and efficiency of electric motors, an advanced cooling method that can replace the existing water-cooling method is required. This study applies a flow boiling cooling method using R134a and compares its cooling performance to that of a water-cooled motor. The results show that the flow boiling cooling method can maintain a lower winding temperature and reduce the power consumption of the cooling pump.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2023)
Article
Thermodynamics
Sunjin Kim, Sangwook Lee, Dong Gyun Kang, Min Soo Kim
Summary: In order to improve the stability and efficiency of electric motors, an advanced cooling method using flow boiling with R134a as the refrigerant is proposed and compared to the conventional water-cooling method. A transient three-dimensional thermal model is developed to calculate the heat loss and temperature change inside the motor, and the results show that flow boiling cooling can maintain lower winding temperatures and reduce power consumption. However, proper refrigerant flow rate is necessary to prevent complete vaporization and ensure efficient heat transfer.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2023)
Article
Engineering, Multidisciplinary
Yunlong Bi, Feng Chai, Lei Chen
Summary: This article investigates the thermal properties of axial flux permanent magnet motors, designs a modified cooling structure to enhance cooling performance, and discusses the influence of thermal conductivity and stator yoke thickness on cooling performance. Computational fluid dynamics thermal analysis is used for verification, and a prototype motor with the modified cooling structure is tested.
IEEE TRANSACTIONS ON INDUSTRY APPLICATIONS
(2021)
Article
Energy & Fuels
Yu Cao, Shushu Zhu, Junyue Yu, Chuang Liu
Summary: This paper conducts thermal analysis of a generator used in electric vehicles, building a thermal model and studying the influence of heat dissipation rib on temperature. It is found that adding heat dissipation rib can effectively reduce the maximum temperature of the generator.
Article
Thermodynamics
Zehui Sun, Yangfan Xu, Qunjing Wang, Jiazi Xu, Guoli Li, Yan Wen
Summary: This study proposes a lumped-parameter thermal network (LPTN) model to track the temperature changes of a permanent-magnet spherical motor (PMSphM). The model shows high precision and practical applicability for real-time temperature estimation, offering an efficient solution for the motor's heat dissipation issue.
THERMAL SCIENCE AND ENGINEERING PROGRESS
(2023)
Article
Thermodynamics
Dong-Min Kim, Jun-Woo Chin, Jae-Hyun Kim, Myung-Seop Lim
Summary: This study proposes a temperature estimation process for an air supply system based on a lumped parameter thermal network (LPTN), and verifies the feasibility of this method through performance modeling and thermal modeling.
Article
Energy & Fuels
Aldo Boglietti, Fabio Mandrile, Enrico Carpaneto, Mircea Popescu, Sandro Rubino, David Staton
Summary: This paper introduces a second-order thermal model for electrical machines, which is validated using AC tests after determining thermal parameters through DC tests. The proposed model shows high accuracy, with a maximum error below 3% during thermal transient, demonstrating its simplicity and effectiveness compared to a total enclosed fan cooled induction motor.
Article
Engineering, Multidisciplinary
Jun-Yeol Ryu, Sung-Woo Hwang, Jun-Woo Chin, Yong-Suk Hwang, Sang Won Yoon, Myung-Seop Lim
Summary: This article introduces a fast and accurate coupled electromagnetic-thermal analysis method for a permanent magnet synchronous motor, which reduces computational time by proposing mathematical models for electric parameters and characteristics, taking into account their nonlinear variations.
IEEE TRANSACTIONS ON INDUSTRY APPLICATIONS
(2021)
Article
Energy & Fuels
Ding Luo, Yuying Yan, Ying Li, Ruochen Wang, Shan Cheng, Xuelin Yang, Dongxu Ji
Summary: This study proposes a hybrid transient CFD-thermoelectric numerical model to predict the dynamic response characteristics of an automobile thermoelectric generator system. Through transient numerical study, it is found that the dynamic output power changes smoothly while the conversion efficiency fluctuates greatly. The findings contribute to a better understanding of the dynamic response characteristics of the automobile thermoelectric generator system.
Article
Thermodynamics
Shuai Zhang, Yuying Yan
Summary: This study conducted a comprehensive analysis on the energy, exergy, and economic aspects of using ceramic foam/molten salt composite phase change material (CPCM) for medium-and high-temperature thermal energy storage systems. The results showed that the melting rate and energy storage rate were significantly improved with the use of ceramic foam-enhanced molten salt. The exergy efficiency of CPCMs was also higher than that of pure PCM. Additionally, the economic analysis indicated the feasibility of CPCMs with certain porosities within a certain price range. This study is of great importance for the large-scale application of ceramic foam in thermal energy storage.
Article
Mechanics
Wenning Zhou, Yufu Xing, Xunliang Liu, Yuying Yan
Summary: In this study, a multi-relaxation time phase-field lattice Boltzmann model is proposed for simulating droplet dynamics with soluble surfactants. The accuracy and validity of the model are verified by benchmark tests, and the effects of surfactant, capillary number, and density ratio on droplet deformation and interaction are investigated. The simulation results show that the inhomogeneous distribution of surfactant generates Marangoni stress, which promotes droplet deformation and hinders droplet coalescence. Within the studied range, droplets deform more easily with a decrease in density ratio, while an increase in capillary number and surfactant concentration promotes droplet deformation and breakup. Moreover, a higher surfactant concentration results in a thicker liquid film between droplets, hindering their coalescence.
Article
Thermodynamics
Ding Luo, Yuying Yan, Ying Li, Wei-Hsin Chen, Xuelin Yang, Xuehui Wang, Bingyang Cao
Summary: This study evaluates the dynamic performance of a simplified automobile thermoelectric generator under different driving cycles and provides guidance for the application of automobile thermoelectric waste heat recovery. The findings suggest that the dynamic output power of the generator exhibits smoother fluctuations compared to exhaust temperature and displays hysteresis in its response, while the dynamic conversion efficiency experiences sharp fluctuations. The behavior of the generator in dynamic situations is not entirely proportional to vehicle speed but depends on changes in exhaust heat. Comparing steady and dynamic results, it is found that the steady-state model overestimates output power but may underestimate conversion efficiency. The automobile thermoelectric generator is more suitable for vehicles with frequent speed changes to enhance dynamic output performance.
APPLIED THERMAL ENGINEERING
(2023)
Review
Energy & Fuels
Dan Dan, Yihang Zhao, Mingshan Wei, Xuehui Wang
Summary: As the electric vehicle industry grows, efficient thermal management systems are crucial for battery safety, energy utilization, and vehicle lifespan. This paper presents a comprehensive review of various thermal management approaches for electric vehicle air conditioning systems, battery thermal management systems, and motor thermal management systems. The use of phase change heat transfer process is recommended for heat dissipation or direct cooling in each subsystem. The integration of AC systems, battery thermal management systems, and motor thermal management systems is expected to maximize energy utilization efficiency. The paper discusses the challenges and limitations of existing systems and provides potential avenues for future research. It is expected to serve as a valuable reference for future studies.
Article
Energy & Fuels
Shuai Zhang, Yuying Yan, Yingai Jin, Yang Gao
Summary: In this study, the energy storage performance of ceramic foam-enhanced molten salt in a shell-and-tube unit is investigated. The effects of ceramic foam configurations such as the filling height, porosity and outer diameter are studied. The results show that the enhancement performance is remarkable when the ceramic foam reaches the inner tube, while it is insignificant in the case of below the inner tube. The study suggests that ceramic foam can serve as a suitable thermal enhancer for molten salt in high-temperature solar thermal energy storage applications due to its corrosion resistance and cost advantage.
Article
Thermodynamics
Baoping Xu, Peihong Jiang, Zhuo Chen, Qiangang Li, Xi Wang, Yuying Yan
Summary: Intermittent heating is considered to be an effective way to save energy compared to continuous heating. However, the actual energy savings can vary greatly depending on building conditions, terminals, and heating supply systems. More research is needed on the energy savings resulting from intermittent heating for multi-zone buildings with heat pumps and specific terminals.
APPLIED THERMAL ENGINEERING
(2023)
Article
Engineering, Chemical
Xinyue Hao, Neng Gao, Xuehui Wang, Nian Li, Guangming Chen, Qin Wang
Summary: This study evaluated four potential alternatives to HFC-245fa for ERC and found that HCFO-1233zd(E) and HCFO-1224 yd(Z) are outstanding candidates with superior performance. HFO-1336mzz(Z) has lower pump power consumption, while HC-600 exhibits excellent performance but is hindered by its flammability.
ASIA-PACIFIC JOURNAL OF CHEMICAL ENGINEERING
(2023)
Article
Materials Science, Multidisciplinary
Zhiming Xu, Yu Zhao, Yuying Yan, Hao Zhang
Summary: This study investigates the corrosion inhibition properties of Sodium carboxymethyl cellulose (SCMC) on Fe, Cu, and Al using molecular dynamics simulations. The effects of the adsorption configuration, interaction energy of SCMC on different metal surfaces, and the degree of polymerization change of SCMC molecules were analyzed. The results show that SCMC has a strong interaction with metal surfaces and can still adsorb to the metal surface in a water environment, although the adsorption energy is reduced.
COMPUTATIONAL MATERIALS SCIENCE
(2023)
Article
Thermodynamics
Ding Luo, Yuying Yan, Ying Li, Xuelin Yang, Hao Chen
Summary: The automobile thermoelectric generator is a promising technology for improving fuel economy. By optimizing the fin distance and thickness of the heat exchanger, significant improvements in performance are observed, with increases in power, efficiency, net power, and net efficiency compared to the generator without fin optimizations.
Article
Thermodynamics
Ding Luo, Ying Li, Yuying Yan, Xiaoming Hu, Xi'an Fan, Wei-Hsin Chen, Yong Ren, Bingyang Cao
Summary: This study aims to address the low conversion efficiency of thermoelectric modules by introducing a novel periodic heating method. Testing and modeling analysis showed that the periodic heating method greatly improved the average efficiency and ZTta value of the thermoelectric modules. Additionally, recommendations for optimizing parameters were provided to further enhance the dynamic behavior.
ENERGY CONVERSION AND MANAGEMENT
(2023)
Article
Energy & Fuels
Wanchen Sun, Wenpeng Zeng, Liang Guo, Hao Zhang, Yuying Yan, Shaodian Lin, Genan Zhu, Mengqi Jiang, Changyou Yu, Fei Wu
Summary: Under the background of the carbon peak and carbon neutrality, the development and utilization of zero-carbon fuels, such as green ammonia and green hydrogen, have gained attention. The transportation and storage issues of hydrogen limit its industrial development, while ammonia has advantages as a hydrogen energy carrier for power systems. A study on the combustion and flame development of the ammonia-diesel dual-fuel engine was conducted, and the results showed that ammonia combustion has lower heat release and lower indicated mean effective pressure compared to pure diesel combustion. The flame characteristics of the ammonia-diesel dual-fuel combustion mode differed from the pure diesel combustion mode.
Article
Thermodynamics
Ding Luo, Yuying Yan, Wei-Hsin Chen, Xuelin Yang, Hao Chen, Bingyang Cao, Yulong Zhao
Summary: This paper proposes a comprehensive hybrid transient CFD-thermal resistance model for predicting the dynamic behavior of an automobile thermoelectric generator (ATEG) system. The model considers temperature dependencies, topological connections of thermoelectric modules, and dynamic characteristics, providing high accuracy and short computational time. The dynamic behavior of the ATEG system is analyzed using transient exhaust heat as the heat source input. The model results show that the dynamic output power of the ATEG system follows the same variation trend as the exhaust temperature, but with more stability. The model is experimentally validated, yielding mean deviations of 7.70% for output voltage and 1.12% for outlet air temperature. It serves as a convenient tool for evaluating the behavior of ATEG systems under different topological connections and assessing their dynamic performance.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2023)
Article
Green & Sustainable Science & Technology
Shuai Zhang, Yuying Yan
Summary: Latent heat thermal energy storage improves the utilization efficiency of renewable energy. Stones are used as both sensible heat storage media and thermal enhancer of phase change materials, which are widely accessible, low-cost and environmentally friendly. This method eliminates the need for additional material preparation and processing, making it more cost-effective and environmentally friendly.
Article
Thermodynamics
Zeyu Liu, Yuying Yan
Summary: This study experimentally investigates the formation of deposition patterns during the evaporation of magnetic nanofluid droplets at different substrate temperatures. The experimental results show that as the temperature increases, the droplet evaporation exhibits uniform patterns, typical 'coffee ring' patterns, and dual ring patterns. The study also reveals the crucial role of Marangoni flow in the formation of secondary ring patterns.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2024)
Article
Thermodynamics
Hai Zhao, Puzhen Gao, Xiaochang Li, Ruifeng Tian, Hongyang Wei, Sichao Tan
Summary: This study numerically investigates the interaction between flow-induced vibration and forced convection heat transfer in a tube bundle. The results show that the impact of flow-induced vibration on heat transfer varies in different flow velocity regions.
APPLIED THERMAL ENGINEERING
(2024)
Article
Thermodynamics
Rohit Chintala, Jon Winkler, Sugirdhalakshmi Ramaraj, Xin Jin
Summary: The current state of fault detection and diagnosis for residential air-conditioning systems is expensive and not suitable for widespread implementation. This paper proposes a cost-effective solution by introducing an automated fault detection algorithm as a screening step before more expensive tests can be conducted. The algorithm uses home thermostats and local weather information to identify thermodynamic parameters and detect high-impact air-conditioning faults.
APPLIED THERMAL ENGINEERING
(2024)
Article
Thermodynamics
A. Azimi, N. Basiri, M. Eslami
Summary: This paper presents a novel optimization algorithm for improving the water-film cooling system of photovoltaic panels, resulting in a significant increase in net energy generation.
APPLIED THERMAL ENGINEERING
(2024)
Article
Thermodynamics
Duc-Thuan Phung, Chin-Hsiang Cheng
Summary: In this study, a novel CFDMD model is used to analyze and investigate the behavior of thermal-lag engines (TLE). The study shows that the CFDMD model effectively captures the thermodynamic behavior of the working gas and the dynamic behavior of the engine mechanism. Additionally, the study explores the temporal evolution of engine speed and the influence of various parameters on shaft power and brake thermal efficiency. The research also reveals the existence of a thermal-lag phenomenon in TLE.
APPLIED THERMAL ENGINEERING
(2024)
Article
Thermodynamics
Haiying Yang, Yinjie Shen, Lin Li, Yichen Pan, Ping Yang
Summary: The purpose of this article is to find a measure to improve the interfacial thermal transfer of graphene/silicon heterojunction. Through molecular dynamics simulation, it is found that surface modification can significantly reduce the thermal resistance, thereby improving the thermal conductivity of the graphene/silicon interface.
APPLIED THERMAL ENGINEERING
(2024)
Article
Thermodynamics
Qiong Wu, Yancheng Wang, Haonan Zhou, Xingye Qiu, Deqing Mei
Summary: This article introduces a visible methanol steam reforming microreactor, which uses an optical crystal as an observation window and measures the reaction temperature in real-time using infrared thermography. The results show that under lower oxygen to carbon ratio conditions, the microreactor has a higher heating rate and a stable gradient in temperature distribution.
APPLIED THERMAL ENGINEERING
(2024)
Review
Thermodynamics
Giulia Manco, Umberto Tesio, Elisa Guelpa, Vittorio Verda
Summary: In the past decade, there has been a growing interest in studying energy systems for the combined management of power vectors. Most of the published works focus on finding the optimal design and operations of Multi Energy Systems (MES). However, for newcomers to this field, understanding how to achieve the desired optimization details while controlling computational expenses can be challenging and time-consuming. This paper presents a novel approach to analyzing the existing literature on MES, with the aim of guiding practical development of MES optimization. Through the discussion of six case studies, the authors provide a mathematical formulation as a reference for building the model and emphasize the impact of different aspects on the problem nature and solver selection. In addition, the paper also discusses the different approaches used in the literature for incorporating thermal networks and storage in the optimization of multi-energy systems.
APPLIED THERMAL ENGINEERING
(2024)
Article
Thermodynamics
Xuepeng Yuan, Caiman Yan, Yunxian Huang, Yong Tang, Shiwei Zhang, Gong Chen
Summary: In this study, a multi-scale microgroove wick (MSMGW) was developed by laser irradiation, which demonstrated superior capillary performance. The surface morphology and performance of the wick were affected by laser scan pitch, laser power, repetition frequency, and scanning speed. The MSMGW showed optimal capillary performance in alumina material and DI water as the working fluid.
APPLIED THERMAL ENGINEERING
(2024)
Article
Thermodynamics
Maofei Mei, Feng Hu, Chong Han
Summary: This paper proposes an effective local search method based on detection of droplet boundaries for understanding the dynamic process of droplet growth during dropwise condensation. The method is validated by comparing with experimental data. The present simulation provides an effective approach to more accurately predict the nucleation site density in future studies.
APPLIED THERMAL ENGINEERING
(2024)
Article
Thermodynamics
Rahul Kumar Sharma, Ashish Kumar, Dibakar Rakshit
Summary: The study explores the use of phase change materials (PCM) as a retrofit with Heating Ventilation and Air-conditioning systems (HVAC) to reduce energy consumption and improve air quality. By incorporating PCM with specific thickness and fin configurations, significant energy savings can be achieved in comparison to standard HVAC systems utilizing R134a. This research provides policymakers with energy-efficient and sustainable solutions for HVAC systems to combat climate change.
APPLIED THERMAL ENGINEERING
(2024)
Article
Thermodynamics
Zhenhua Ren, Xiangjin Meng, Xingang Qi, Hui Jin, Yunan Chen, Bin Chen, Liejin Guo
Summary: This paper investigates the heat transfer mechanism and factors influencing thermal radiation in the process of supercritical water gasification (SCWG) of coal, and proposes a comprehensive numerical model to simulate the process. Experimental validation results show that thermal radiation accounts for a significant proportion of the total heat exchange in the reactor and a large amount of radiant energy exists in the important spectral range of supercritical water. Enhancing radiative heat transfer can effectively increase the temperature of the reaction medium and the gasification rate.
APPLIED THERMAL ENGINEERING
(2024)
Article
Thermodynamics
Mauro Abela, Mauro Mameli, Sauro Filippeschi, Brent S. Taft
Summary: Pulsating Heat Pipes (PHP) are passive two-phase heat transfer devices with a simple structure and high heat transfer capabilities. The actual unpredictability of their dynamic behavior during startup and thermal crisis hinders their large-scale application. An experimental apparatus is designed to investigate these phenomena systematically. The results show that increasing the number of evaporator sections and condenser temperature improves the performance of PHP. The condenser temperature also affects the initial liquid phase distribution and startup time.
APPLIED THERMAL ENGINEERING
(2024)
Article
Thermodynamics
Ke Gan, Ruilian Li, Yi Zheng, Hui Xu, Ying Gao, Jiajie Qian, Ziming Wei, Bin Kong, Hong Zhang
Summary: A 3-dimensional enhanced heat pipe radiator has been developed to improve heat dissipation and temperature uniformity in cooling high-power electronic components. Experimental results show that the radiator has superior heat transfer performance compared to a conventional aluminum fin radiator under different heating powers and wind speed conditions.
APPLIED THERMAL ENGINEERING
(2024)
Article
Thermodynamics
Xinyi Zhang, Shuzhong Wang, Daihui Jiang, Zhiqiang Wu
Summary: This study focuses on recovering waste heat from blast furnace slag using dry centrifugal pelletizing technology. A comprehensive two-dimensional model was developed to analyze heat transfer dynamics and investigate factors influencing heat exchange efficiency. The findings have important implications for optimizing waste heat recovery and ensuring safe operations.
APPLIED THERMAL ENGINEERING
(2024)
Article
Thermodynamics
Xincheng Wu, An Zou, Qiang Zhang, Zhaoguang Wang
Summary: The boosting heat generation rate of high-performance processors is challenging traditional cooling techniques. This study proposes a combined design of active jet intermittency and passive surface modification to enhance heat transfer.
APPLIED THERMAL ENGINEERING
(2024)
