Article
Chemistry, Physical
Uday Raj Singh, Satyasekhar Bhogilla
Summary: This study presents a comparative analysis of the performance of metal hydride hydrogen storage units using LaNi5 and compacts of LaNi5 incorporated with expanded natural graphite (ENG). The research highlights the need to enhance thermal conductivity to improve heat transfer during hydrogen absorption. The results demonstrate that the use of LaNi5 and ENG compacts significantly improves heat transfer, hydrogen storage capacity, and reduces absorption time.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Chemistry, Physical
Satyaki Chandra, Pratibha Sharma, P. Muthukumar, Sankara Sarma Tatiparti
Summary: The hydrogen sorption characteristics of a 5 kg-LaNi5 reactor with conical fins and heat transfer tubes were experimentally studied. The results showed that higher water flow rates, lower inlet temperatures, and higher hydrogen pressures could result in faster absorption. Additionally, higher temperatures and water flow rates also increased the driving force for atmospheric desorption.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Green & Sustainable Science & Technology
S. Saedi Ardahaie, M. J. Hosseini, M. Eisapour, A. H. Eisapour, A. A. Ranjbar
Summary: The study focuses on enhancing the storage performance of metal hydride reactors by integrating PCM and spiral tube heat exchangers, showing that increasing the number of FSTPs on the PMHT can reduce absorption duration and improve absorption and desorption performance. The variation in air inlet temperature also affects total desorption and absorption duration. Conical-shaped PCM jackets demonstrate better performance, allowing the PMHT to achieve higher absorption with less PCM usage compared to annulus-shaped PCM jackets.
JOURNAL OF CLEANER PRODUCTION
(2021)
Article
Thermodynamics
Dong-min Kim, Joong Kim, Jungchul Lee, Bong Jae Lee
Summary: The effective thermal conductivity of LaNi5 powder packed bed was analyzed using a miniaturized guarded hot-plate apparatus in this study. Calibration experiment and uncertainty analysis were conducted to validate the accuracy of the apparatus. The study estimated the effect of particle size on the contact factor of the packed bed and analyzed the impact of contact factor and gas thermal conductivity on the characteristic length of the gas film using the Yagi and Kunii model.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2021)
Article
Thermodynamics
Guixiang Lu, Yanyun Liu, Jianye Kang, Mingxin Lyu, Yanhua Lai, Zhen Dong
Summary: This study proposes a numerical model that considers both axial and radial heat conduction for a thermal mass flowmeter (TMF) to address the limitations of traditional models. By using a feedback adjustment convergence program, the improved model reduces the calculation errors compared to experimental data.
APPLIED THERMAL ENGINEERING
(2024)
Article
Thermodynamics
Xiao-Shuai Bai, Wei-Wei Yang, Xin-Yuan Tang, Zhou-Qiao Dai, Fu-Sheng Yang
Summary: This study investigates the coupled fin-metal foam metal hydride reactor using a 3D multi-physical model. The results show that the fin-metal foam reactor has lower thermal resistance and improved charging time and hydrogen absorption performance.
Article
Materials Science, Ceramics
Nazmul Huda, Mark A. Whitney, Mohammad H. Razmpoosh, Adrian P. Gerlich, John Z. Wen, Stephen F. Corbin
Summary: Ceramic materials have the potential to store thermal energy with reasonable cost, with their thermodynamic properties depending on temperature and energy storage capacity varying significantly with microstructure and porosity. The correlation between microstructure change and energy storage capacity is explored through characterization of alumina specimens.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2021)
Article
Chemistry, Physical
Yi Yang, Xiaofeng Mou, Zezhi Zhu, Zewei Bao
Summary: In this study, an ETC measurement cell based on the steady-state radial heat flow method was fabricated and its reliability was confirmed. The experimental results show that the ETC of activated LaNi5 powder is lower than that of unactuated material, and it increases with pressure and thermal conductivity of filling gas. The effects of hydrogen absorption and desorption on ETC depend on hydrogen concentration and expansion/constriction of MH particles.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Thermodynamics
Quyen Nguyen, Alireza Naghieh, Rasool Kalbasi, Mohammad Akbari, Arash Karimipour, Iskander Tlili
Summary: Incorporating phase change materials (PCM) into building walls can effectively reduce annual heat transfer, with better performance in warmer months and a more significant effect with lower thermal conductivity.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2021)
Article
Chemistry, Physical
Hongen Yu, Yong Wu, Shunpeng Chen, Zewei Xie, Yiman Wu, Nuo Cheng, Xue Yang, Wei Lin, Lei Xie, Xingguo Li, Jie Zheng
Summary: In this study, a palladium catalyst loaded on a hydrogen storage support-Pd/LaNi5 was synthesized and its catalytic property in reversible hydrogen storage of N-ethylcarbazole (NEC) was investigated. The results showed that the catalytic performance of 1 wt%Pd/LaNi5 was significantly better than that of Pd/Al2O3 with the same Pd loading. This improvement was attributed to the ample lattice hydrogen bonding sites and fast bulk hydrogen diffusion kinetics of LaNi5.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2022)
Article
Chemistry, Physical
C. Juillet, M. Tupin, F. Martin, Q. Auzoux, C. Berthinier, F. Gaudier, T. Guilbert, C. Toffolon
Summary: This study identifies and quantifies the rate-limiting steps of the hydrogen desorption process from unoxidized M5 alloy. It reveals that surface molecular recombination and trapping of hydrogen by Nb-rich precipitates are key factors affecting desorption kinetics. The kinetic constant for surface recombination on M5 alloy is found to be identical to that on Zircaloy-4.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Green & Sustainable Science & Technology
Yang Ye, Yi Yue, Jianfeng Lu, Jing Ding, Weilong Wang, Jinyue Yan
Summary: This paper proposes a novel hydrogen storage reactor design using metal hydride materials, phase change materials, and a heat exchanger to enhance heat transfer efficiency and hydrogen storage performance; the results show that effective thermal conductivity plays a key role in improving heat transfer and reaction rates, and increasing hydrogen supply pressure can effectively accelerate hydrogen absorption rates.
Article
Green & Sustainable Science & Technology
Min Liu, Bo Zhao, Yaze Li, Zhen Wang, Xuesong Zhang, Liang Tong, Tianqi Yang, Xuefang Li, Jinsheng Xiao
Summary: This study investigated the effects of fin structure and injection tube on the performance of a hydrogen storage tank packed with LaNi5 alloy. A parametric study was conducted to optimize the tank design and improve its efficiency and safety. The results showed that the fin structure improved heat transfer performance and the injection tube enhanced hydrogen mass transfer in the tank.
Article
Materials Science, Ceramics
Xianxi Li, Liwen Yan, Yibo Zhang, Xukun Yang, Anran Guo, Haiyan Du, Feng Hou, Jiachen Liu
Summary: The demand for high-performance lightweight thermal insulation materials in reusable spacecraft and vehicles has led to the development of porous silica ceramics with lightweight, ultra-low thermal conductivity, and enhanced compressive strength. By using different sizes of silica particles, the compressive strength and pore structure integrity of the ceramics were improved. These ceramics have a very low thermal conductivity and are suitable for use as thermal insulation materials in aerospace and space applications.
CERAMICS INTERNATIONAL
(2022)
Article
Thermodynamics
Xiaofeng Mou, Zewei Bao, Weixing Huang
Summary: A three-dimensional model was used to study the performance of a metal hydride reactor with a helically coiled heat exchanger. The influence of different operation parameters at various stages of hydrogen absorption and desorption was explored. The simulation results showed that the hydrogen absorption or desorption reaction was mainly dependent on the hydrogen supply pressure or outlet pressure during the initial stage, while it was determined by the heat transfer rate beyond the initial stage. Factors such as inlet temperature, thermal resistance, and flow rate of the heat transfer fluid were found to affect the hydrogen absorption process.
THERMAL SCIENCE AND ENGINEERING PROGRESS
(2023)
Article
Energy & Fuels
Aissa Dehane, Slimane Merouani
Summary: The sonolysis of methane in a single acoustic bubble at frequencies ranging from 140 kHz to 515 kHz was investigated. The yield of H2 was improved regardless of the methane dose, especially at lower wave frequencies. The optimal methane fraction, hydrogen production, and methane conversion were found at different frequencies.
Article
Chemistry, Physical
Aissa Dehane, Slimane Merouani, Oualid Hamdaoui, Kyuichi Yasui, Muthupandian Ashokkumar
Summary: In sonochemistry, acoustic bubbles serve as microreactors for producing hydrogen and oxidants. This study developed a novel semi-empirical method using hydrogen sono-production to determine the number density of micro-bubbles during water sonolysis. The results showed that the number density of bubbles ranged from -108 to -1013 L-1 s-1, depending on the experimental conditions, and the calculation method used. The study also found that the number of active bubbles increased with frequency, but decreased when calculated via the total single-bubble yield, especially at higher frequencies and colder liquid temperatures.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Chemistry, Physical
Atef Chibani, Ghania Mecheri, Slimane Merouani, Aissa Dehane
Summary: A computational fluid dynamics model was used to simulate the heat transfer in industrial-scale hydrogen storage using activated carbon and metal foam phase change material. The study found that adjusting the porosity of the metal foam can accelerate the heat transfer in the activated carbon layer.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Chemistry, Physical
Mohamed Larbi Djaballah, Aouattef Belghit, Aissa Dehane, Slimane Merouani, Oualid Hamdaoui, Muthapandian Ashokkumar
Summary: This study developed a chemical kinetic model to investigate the intensified removal mechanism of reactive green 12 dye using UV/chlorine AOP. The model fits well with experimental data across different pH values and initial chlorine concentrations. The results showed that (OH)-O• radicals contributed majorly (about 85%) to the degradation, while Cl• and ClO• contributed about 15%.
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
(2023)
Article
Thermodynamics
Atef Chibani, Aissa Dehane, Slimane Merouani
Summary: The effects of incorporating four different nanoparticles (Al2O3, MgO, SiO2, and SnO2) at various concentrations into PCM (RT82) were investigated in a cylindrical shell and multi-tube heat exchanger of large configuration. A numerical model was developed and validated using experimental and theoretical findings. The freezing rate of PCM was significantly enhanced with increasing metal oxides concentration, and the best performance was observed with SiO2 nanoparticles.
NUMERICAL HEAT TRANSFER PART A-APPLICATIONS
(2023)
Article
Thermodynamics
Atef Chibani, Slimane Merouani, Ghania Mecheri, Aissa Dehane, Djemaa Guerraiche
Summary: The effects of temperature variation on the melting/solidification of PCM phase change material (C-19-C-20) and the cooling/heating of air (HTF heat transfer fluid) in a heat exchanger were analyzed. Aluminum foam (20%, v/v) was used to improve the thermal conductivity of the PCM. It was found that increasing/decreasing the external temperature enhanced the melting/freezing processes of PCM, while the cooling/heating mechanisms of air were less affected by the external temperature. The freezing regime of PCM was observed to be slower compared to its fusion process.
NUMERICAL HEAT TRANSFER PART B-FUNDAMENTALS
(2023)
Article
Thermodynamics
Atef Chibani, Slimane Merouani, Mohamed Razi Morakchi, Noureddine Gherraf, Aissa Dehane, Ghania Mecheri, Cherif Bougriou, Djemaa Guerraiche
Summary: This study investigates the effects of metal foam and nano-sized particles on the solidification process of phase change materials in a large-scale latent thermal energy storage unit. The results show that the metal foam technique accelerates the solidification process more effectively than the nanoparticles system, and the improvement in solidification performance is influenced by the thermal conductivity and porosity of the metal foam.
NUMERICAL HEAT TRANSFER PART B-FUNDAMENTALS
(2023)
Article
Acoustics
Aissa Dehane, Boumediene Haddad, Slimane Merouani, Oualid Hamdaoui
Summary: This study numerically assesses the impact of methanol mass transport on the thermodynamics and chemical effects of acoustic cavitation. The study found that the impact of methanol concentration on various parameters is frequency dependent and more pronounced at lower ultrasound frequencies. However, decreasing acoustic intensity reduces the effect of methanol mass transport on bubble sono-activity. The findings highlight the importance of incorporating methanol evaporation and condensation mechanisms in numerical simulations.
ULTRASONICS SONOCHEMISTRY
(2023)
Article
Thermodynamics
Atef Chibani, Aissa Dehane, Slimane Merouani
Summary: To maintain a constant temperature in sonochemical reactors, cryothermostat systems are usually employed, which consume significant energy. In this study, a new approach utilizing phase change materials (PCMs) for heat recovery and storage in ultrasonic reactors was introduced. The analysis was conducted on sonicated water in a standing wave ultrasonic reactor, and promising results in thermal energy management and storage were obtained using a PCM instead of a water-cooling system.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2023)
Article
Acoustics
Atef Chibani, Aissa Dehane, Slimane Merouani, Oualid Hamdaoui
Summary: This study presents the use of a phase change material (PCM) as an alternative cooling system for a sonoreactor, and analyzes the performance of the PCM at different liquid heights and electric powers. Despite the low thermal conductivity of the PCM, promising results were obtained, with the best performance observed at a liquid height of 15.3 cm and an electric power of 60 W.
ULTRASONICS SONOCHEMISTRY
(2023)
Article
Thermodynamics
Atef Chibani, Slimane Merouani, Aissa Dehane
Summary: This study presents a numerical simulation of a packed bed reactor filled with activated carbon for hydrogen storage, incorporating phase change material (PCM) with various heat transfer enhancers. The results showed that metal foam provides the best cooling performance, while fins enhance the melting rate of the PCM.
NUMERICAL HEAT TRANSFER PART B-FUNDAMENTALS
(2023)
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)