Article
Engineering, Environmental
Xiaomang Miao, Fahid Riaz, Badr Alotaibi, Manoj Kumar Agrawal, Mohammed Abuhussain, Theyab R. Alsenani, Mansoureh Alizadeh Balderlou, Qing Lin
Summary: This study investigated the influence of spiral fins on the performance enhancement of a vertical tube-shell LHTESS in the solidification process. Different forms of fins, including quadruple, triple, double, and single fins, were studied. The triple fin case showed the best performance, while the single fin case showed the least enhancement. There was a trade-off between fin number and length of each fin in terms of performance enhancement.
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
(2023)
Article
Green & Sustainable Science & Technology
Juan Duan, Zeyu Peng
Summary: In the annular tube with spiral fins, adding nanoparticles to phase change material (nano-PCM) can greatly enhance energy storage efficiency. The study investigates the energy storage process and enhancement rate of nano-PCM in the annular tube with spiral fins, and finds that adding graphene to PCM leads to a sixfold increase in melting rate compared to adding Al2O3. Adding 1% graphene significantly enhances the energy storage process.
Article
Thermodynamics
Akshat Patel, Vivek Kumar Singh
Summary: This study aims to improve the energy release and storage rate of PCM heat sinks by employing a novel PCM heat sink with double-sided spiral fins. The results show that increasing the diameter and length of the fins reduces the critical temperature and time taken to reach initial conditions. The best configuration of spiral fins reduces the critical temperature and time by 7 K and 19 mins, respectively, compared to traditional pin fins.
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
(2022)
Article
Green & Sustainable Science & Technology
Jerzy Woloszyn, Krystian Szopa
Summary: The objective of this research is to design a new latent heat thermal energy storage system with improved thermal conductivity and reduced melting and solidification time. Numerical experiments comparing different designs show that the proposed system significantly reduces melting and solidification time compared to traditional systems, and achieves the highest efficiency.
Article
Thermodynamics
Digant S. Mehta, Bhavesh Vaghela, Manish K. Rathod, Jyotirmay Banerjee
Summary: The experimental analysis on the heat transfer enhancement in concentric tube type Latent Heat Storage Unit (LHSU) using spiral fins revealed that the provision of fins expedited the melting rate and reduced the time required for energy storage. The maximum reduction in charging time of 51.61% was observed with vertical orientation, while inclined and horizontal orientations offered reductions of 40.97% and 34.1% respectively. Integration of spiral fins may enable the application of LHSU to large scale solar thermal applications.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2021)
Article
Thermodynamics
Shu-Bo Chen, S. Saleem, Mohammed N. Alghamdi, Kottakkaran Sooppy Nisar, Akbar Arsalanloo, Alibek Issakhov, Wei-Feng Xia
Summary: This study investigated the performance of a vertically oriented PCM storage system with different types and combinations of PCM. Lower volume fractions of nanoparticles can enhance melting performance when using nano-PCMs, while using porous media can significantly improve the melting process.
CASE STUDIES IN THERMAL ENGINEERING
(2021)
Article
Energy & Fuels
Sajjad Ahangar Zonouzi, Arash Dadvar
Summary: This paper focuses on improving the thermal performance of a vertically oriented shell and tube latent heat thermal energy storage (LHTES) system by using helical fins. The results show that the use of helical fins can reduce the total melting time of the phase change material (PCM) by 18.25% to 21.5% compared to axially finned LHTES systems. The presence of helical fins allows for both transverse and longitudinal convection, resulting in deeper penetration of heat and faster melting of the PCM.
JOURNAL OF ENERGY STORAGE
(2022)
Article
Energy & Fuels
Fakhar ul Hasnain, Muhammad Irfan, Muhammad Mahabat Khan, Lehar Asip Khan, Hassan Farooq Ahmed
Summary: This study highlights the enhancement of PCM melting performance through the application of branched fins and nanoparticles. Different fin designs are found to significantly improve melting efficiency, while the addition of nanoparticles further reduces melting time. However, the additional nanoparticles decrease the energy storage capacity.
JOURNAL OF ENERGY STORAGE
(2021)
Article
Energy & Fuels
Gabriele Humbert, Yulong Ding, Adriano Sciacovelli
Summary: This paper addresses the need to enhance heat and mass transfer in solid-gas reactive beds by proposing the use of branched fins made of high conducting material. The optimal fin designs are derived through surrogate models and the results show that the use of optimized branched fins can increase the discharged energy by up to +9.1%. However, in reactive beds where heat and mass transfer mainly occur along the same direction, bifurcations in the fins may hinder reactant transfer, reducing thermal performance.
Article
Thermodynamics
Sachin Rana, Mohammad Zunaid, Rajesh Kumar
Summary: This research work evaluates the thermal performance capabilities of a heat exchanger with multiple circular tubes and fins, and a phase change material charged in the shell region. The study shows that adding fins to the tubes improves heat transmission and reduces melting time of the PCM.
CASE STUDIES IN THERMAL ENGINEERING
(2022)
Article
Energy & Fuels
Somayeh Davoodabadi Farahani, Amir Davoodabadi Farahani, Amirhossein Jazari Mamoei, Wei-Mon Yan
Summary: In this work, the numerical analysis of heat transfer and melting enhancement of phase change material (PCM) in a cylindrical thermal energy storage system was studied. The RT82 was used as PCM and the finite volume method was employed for numerical solution. The effects of strip fins, Fe3O4 nanoparticles, and uniform and non-uniform magnetic fields on PCM melting were investigated. The results showed that the new arrangement of strip fins reduced the melting time by about 51%. Addition of nanoparticles improved the melting time by 15-22%. The use of uniform magnetic field had little effect, but in finned cases it doubled the amount of releasing energy compared to those without magnetic field. The variable magnetic field improved the phase change process by 39% and a >60% reduction in melting time was observed with parabolic changes in the z-direction of magnetic field origin (electric voltage).
JOURNAL OF ENERGY STORAGE
(2023)
Article
Energy & Fuels
Sachin Rana, Mohammad Zunaid, Rajesh Kumar
Summary: The study examines the thermal performance of a heat exchanger with multiple elliptical tubes and a phase change material. By incorporating fins on the elliptical tubes, the heat transmission is improved. The results show that adding fins reduces the melting time and enhances heat transfer efficiency.
JOURNAL OF ENERGY STORAGE
(2022)
Article
Thermodynamics
Saif Ed-Din Fertahi, A. Samaouali, T. Bouhal, A. Arid
Summary: The study found that the time required for complete melting of phase change material varied depending on its shape, with cylindrical capsules taking longer than elliptical ones. Different shapes of phase change materials also affected thermal storage efficiency, with the middle section of the tank showing the highest efficiency compared to the bottom and top sections.
APPLIED THERMAL ENGINEERING
(2022)
Review
Energy & Fuels
Xueliang Zhu, Yan Li, Qunzhi Zhu
Summary: In the process of industrial waste heat recovery, phase change heat storage technology is popular due to its high heat storage density and constant temperature absorption/release process. This paper summarizes the development of new fins in the industry and the optimization results of size, shape, and arrangement. The research shows that multi-branch structure, non-uniform fin array, and targeted fin arrangement can enhance heat transfer.
JOURNAL OF ENERGY STORAGE
(2022)
Article
Thermodynamics
Thavamalar Kumaravelu, Syamimi Saadon, Abd Rahim Abu Talib
Summary: The Stirling engine has high theoretical efficiency and multi-fuel adaptability, but its performance is penalized when integrated with a low heat source. This paper focuses on enhancing engine performance through heat transfer, investigating the effects of different types of fins on efficiency through numerical analysis. The addition of rectangular fins led to the highest efficiency of 19.03% with improvements in heat transfer rate, efficiency, and power output.
Article
Energy & Fuels
Grzegorz Czerwinski, Jerzy Woloszyn
Summary: Air cooling systems are popular and cost-effective in maintaining safe temperatures for electronic devices, with heat sinks widely used to increase heat transfer surface area. The study optimized heat sink shape using the Adjoint Solver technique, with findings showing that increased fin angle and height led to decreased temperature behind the heat sink and increased heat source temperature. The best design for minimal temperature behind the heat sink was achieved with deformed fins in iteration 14, resulting in a significant temperature reduction.
Article
Energy & Fuels
Grzegorz Czerwinski, Jerzy Woloszyn
Summary: The paper focuses on modifying the evaporation-condensation model in ANSYS Fluent for two-phase closed thermosyphon, by adjusting the mass transfer time relaxation parameter values to simulate heat transfer processes accurately. The variable parameter values depending on the density of liquid and vapor phase were considered in the calculations to achieve more precise modeling.
Article
Chemistry, Multidisciplinary
Jerzy Woloszyn, Gabriela Wyciszkiewicz
Summary: The numerical analysis of a heat exchanger with phase change material examined the impact of fins design parameters on the melting time of the storage medium. Increasing the number and length of fins was found to shorten the phase change time, but excessively long fins would inhibit convective currents.
PRZEMYSL CHEMICZNY
(2021)
Article
Green & Sustainable Science & Technology
Grzegorz Suchanek, Jerzy Woloszyn, Andrzej Golas
Summary: Polluted air has a significant impact on human health. To address the persistent smog problem, there is a need to locate illegal waste incineration sites. One potential solution is the use of multi-rotor drones, which has become an important research topic. This study aimed to determine the feasibility of using simple algorithms to identify pollution sources. Three different search algorithms were simulated and analyzed, with a focus on accuracy and scalability. Fieldwork tests were conducted with two multi-rotor robots, and the results showed that the robot's indication of the pollution source's position had a maximum difference of 15 meters compared to the actual position.
Article
Energy & Fuels
Joanna Iwaniec, Marek Iwaniec, Piotr Kurowski, Krystian Szopa
Summary: This paper presents a pseudo-impulse pull-and-release method for dynamic analysis of large-scale constructions. The method allows for the determination of frequency response functions and estimation of modal parameters of lightly damped structures. The method has the advantage of independence from repeated experimental parameters and the ability to accurately synchronize and normalize output time histories without measuring the input excitation signal. It improves the conditioning of excitation and enables visualization of poles that are non-detectable in classical analysis.
Article
Energy & Fuels
Grzegorz Czerwinski, Jerzy Woloszyn
Summary: Changes in the energy sector, associated with the move away from fossil fuels, present a challenge for thermal energy management in residential buildings. Latent heat thermal energy storage is an important method to handle the variability of renewable energy in thermal systems. This research investigates the global sensitivity of fin geometrical parameters on the melting and solidification times, as well as the energy efficiency of these processes.
Article
Chemistry, Multidisciplinary
Jerzy Woloszyn
Summary: The enthalpy and phase transition temperature remained unchanged with the addition of nanopowders, while a significant increase in phase transition time was observed as the nanomaterial content increased.
PRZEMYSL CHEMICZNY
(2022)
Article
Green & Sustainable Science & Technology
Jerzy Woloszyn, Krystian Szopa
Summary: The objective of this research is to design a new latent heat thermal energy storage system with improved thermal conductivity and reduced melting and solidification time. Numerical experiments comparing different designs show that the proposed system significantly reduces melting and solidification time compared to traditional systems, and achieves the highest efficiency.
Article
Chemistry, Multidisciplinary
Jerzy Woloszyn, Pawel Zieba, Slawomir Rozycki
Summary: The operation of control devices in direct heating substations for technol. facilities and buildings was simulated using OpenModelica. The study found that these devices can maintain the required temperature across a wide range of settings. The results for a selected case were presented.
PRZEMYSL CHEMICZNY
(2023)
Article
Computer Science, Theory & Methods
Marek Jaszczur, Karolina Papis, Michal Ksiazek, Grzegorz Czerwinski, Gabriel Wojtas, Wojciech Koncewicz, Sylwia Nabozna, Marcin Wojcik
Summary: The study selected classical and laminar (Wortmann) airfoils as the basis for the solar plane design, and provided recommendations on the method of connecting the wing to the nacelle and the installation of PV panels through numerical simulation and experimental validation.
COMPUTER SCIENCE-AGH
(2021)
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)
