Article
Thermodynamics
Amir Hossein Mardan Dezfouli, Sahand Majidi, Ali Jahangiri
Summary: A detailed simulation of the melting process in a latent thermal energy storage system showed that the presence of a uniform magnetic field improved the phase change behavior and accelerated the charging process.
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
(2023)
Article
Engineering, Multidisciplinary
Parinya Kiatpachai, Thawatchai Keawkamrop, Lazarus Godson Asirvatham, Mehrdad Mesgarpour, Ahmet Selim Dalkilic, Ho Seon Ahn, Omid Mahian, Somchai Wongwises
Summary: We investigated the effect of different fin patterns on the air-side performance of a novel heat exchanger, louver spiral fin-and-tube heat exchangers (LSFTHXs). The results showed that the louver-spiral fin performed better than the plain-spiral fin in terms of heat transfer rate, heat transfer coefficient, and Colburn factor. There was no significant difference in pressure drop and friction factor between the louver-spiral and plain-spiral fins.
ALEXANDRIA ENGINEERING JOURNAL
(2022)
Article
Energy & Fuels
Sunnykumar Patel, Syeda Humaira Tasnim, Shohel Mahmud
Summary: This study presents a novel approach of charging PCM inside toroidal tubes in LHTES system. Numerical investigations reveal that fin orientation plays a dominant role in enhancing heat transfer. In the toroidal tube LHTES system, correctly oriented fins provide higher rate of energy storage and save melting time.
JOURNAL OF ENERGY STORAGE
(2022)
Article
Engineering, Multidisciplinary
Mohamed A. Alnakeeb, Mahmoud A. Saad, Mohamed A. Hassab
Summary: Numerical study on thermal and hydraulic performance of a fin and flat tube heat exchanger with various aspect ratios revealed that the flat-tube aspect ratio has a significant effect on pressure drop and heat transfer per unit fan power. It is recommended to choose flat tubes with lower aspect ratios to reduce energy consumption and improve overall performance.
ALEXANDRIA ENGINEERING JOURNAL
(2021)
Article
Engineering, Multidisciplinary
Mao QianJun, Cao Yan, Li Tao
Summary: This study experimentally researched and compared the thermal behavior of two thermal storage units using different heat transfer tubes. The results showed that using a spiral tube as the heat transfer tube can increase the energy storage efficiency of PCMs and shorten the melting time.
SCIENCE CHINA-TECHNOLOGICAL SCIENCES
(2023)
Article
Environmental Sciences
Imran Nazir Unar, Ghulamullah Maitlo, Sikandar Ali Abbasi, Masroor Abro, Raja Fahad Qureshi, Sheeraz Ahmed Memon, Tanveer Hussain, Kashif Hussain Mangi
Summary: Pakistan suffers from energy deficiency, despite having abundant sunlight resources. The research measures the performance of solar flat plate collectors at different tilt angles and geographical coordinates through numerical simulations.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2022)
Article
Green & Sustainable Science & Technology
Abdulmunem R. Abdulmunem, Pakharuddin Mohd Samin, Hasimah Abdul Rahman, Hashim A. Hussien, Izhari Izmi Mazali, Habibah Ghazali
Summary: This study evaluates the impact of tilt angle on the characteristics of the melting process of PCM-based heat sink inside PV cells, showing that increasing tilt angle decreases PCM melting time and reduces overall PV cell temperature. The results demonstrate excellent agreement between experiments and numerical simulations, highlighting the importance of tilt angle in thermal management of PV cells.
Article
Environmental Sciences
Sonia Z. Issaq, Shamil K. Talal, Aasim A. Azooz
Summary: A new model has been developed to determine the optimal tilt angle for PV panels and solar collectors based on yearly, seasonal, and monthly basis. The model estimates the diffusion component of solar radiation using Orgill and Holland's model, and the relationship between diffusion and direct components is derived from empirical data. The optimal tilt angle for each month, season, and year is determined by maximizing the total amount of diffused and direct radiation. The model is programmed in MATLAB and is consistent with experimental data and other published model predictions.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(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
Hawatchai Keawkamrop, Lazarus Godson Asirvatham, Ahmet Selim Dalkilic, Ho Seon Ahn, Omid Mahian, Somchai Wongwi
Summary: This study experimentally investigates the performance of crimped spiral fin-and-tube heat exchangers with a small tube diameter. The results show that the fin pitch and outer diameter have significant effects on the heat transfer characteristics and friction factor. Correlations between the Nu, j, and f are proposed for designing heat exchangers in the thermal industry.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2021)
Article
Thermodynamics
Mohamed A. Alnakeeb, Mohamed A. Abdel Salam, Mohamed A. Hassab
Summary: Phase-change materials store large amounts of energy in small spaces, but have poor thermal conductivity. This study used numerical analysis to investigate the impact of angular orientation on the charging rate and time of a double tube latent heat storage system. The findings showed that decreasing the aspect ratio increases the average charging rate, and the inner tube with an aspect ratio of 0.5 and angular orientation of 90 degrees had the highest average charging rate.
CASE STUDIES IN THERMAL ENGINEERING
(2022)
Article
Chemistry, Physical
Ying-Fang Zhang, Ahmad Shafee, Mahmoud M. Selim, Alibek Issakhov, Ahmad B. Albadarin
Summary: This study explores the use of a storage tank for charging paraffin, utilizing a spiral pipe with hybrid nanomaterial for effective heat transfer to PCM. Transient modeling in a two-dimensional unit was conducted based on the FVM method, with a focus on the impact of gravity on the unsteady process. Testing the model accuracy against experimental data revealed the importance of selecting a homogeneous model for nanomaterial properties to reduce computational costs.
JOURNAL OF MOLECULAR LIQUIDS
(2021)
Article
Thermodynamics
Hussein M. Maghrabie, A. S. A. Mohamed, Amany M. Fahmy, Ahmed A. Abdel Samee
Summary: In this study, the use of a phase change material (PCM) of paraffin wax RT-42 to cool a photovoltaic (PV) panel was experimentally investigated. The results showed that using PCM can reduce the uneven temperature distribution of the PV panel and increase the electrical efficiency of the panel.
CASE STUDIES IN THERMAL ENGINEERING
(2023)
Article
Thermodynamics
Ahmed Saad Soliman, Li Xu, Junguo Dong, Ping Cheng
Summary: A novel design of photovoltaic phase change materials (PV-PCMs) system is established to improve the thermal and electrical performance of solar panels. Numerical analysis and experimental testing were conducted to find the optimal design, which can enhance the operating temperature duration and electrical efficiency of the solar panel.
APPLIED THERMAL ENGINEERING
(2022)
Article
Thermodynamics
Heng Chen, Hamdi Ayed, Riadh Marzouki, Faezeh Emami, Ibrahim Mahariq, Fahd Jarad
Summary: The study demonstrates that using a flat tube and dual conic turbulator can enhance the performance of a heat exchanger, resulting in up to 33% higher heat transfers and 30% less exergy loss compared to a plain tube heat exchanger. The heat exchanger with a modified dual turbulator with convergent embellishment was selected as the economic case with the highest thermal performance enhancement factor (TEF) and net profit of unit transferred heat load (eta(p)), showing an increase in eta(p) up to 1.26 times with the application of an enhanced conical turbulator.
CASE STUDIES IN THERMAL ENGINEERING
(2021)
Article
Construction & Building Technology
M. Rahimi, M. J. Hosseini, M. Gorzin
SUSTAINABLE CITIES AND SOCIETY
(2019)
Article
Engineering, Multidisciplinary
S. M. Borhani, M. J. Hosseini, A. A. Ranjbar, R. Bahrampoury
APPLIED MATHEMATICAL MODELLING
(2019)
Article
Green & Sustainable Science & Technology
M. H. Joneidi, M. Rahimi, R. Pakrouh, R. Bahrampoury
Article
Energy & Fuels
Majid Gorzin, Mohammad J. Hosseini, Masoume Rahimi, Rasool Bahrampoury
JOURNAL OF ENERGY STORAGE
(2019)
Article
Green & Sustainable Science & Technology
A. Ebrahimi, M. J. Hosseini, A. A. Ranjbar, M. Rahimi, R. Bahrampoury
Article
Thermodynamics
N. Pahlevaninejad, M. Rahimi, M. Gorzin
Summary: The study investigates the hydrodynamic and heat transfer behavior of non-Newtonian nanofluid in a wavy microchannel with rectangular obstacles. By adding aluminum oxide nanoparticles of different sizes and volume fractions to pure water, the effects of different rib heights, Reynolds numbers, and friction factors on heat transfer performance were studied. Results showed that increasing the volume fraction of Al2O3 nanoparticles increased the average Nusselt number, and the case with the highest obstacle height exhibited the largest friction factor value.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2021)
Article
Green & Sustainable Science & Technology
M. Rahimi, S. Saedi Ardahaie, M. J. Hosseini, M. Gorzin
Article
Thermodynamics
Z. Soleymani, M. Rahimi, M. Gorzin, Y. Pahamli
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2020)
Article
Green & Sustainable Science & Technology
A. Ghanbarpour, M. J. Hosseini, A. A. Ranjbar, M. Rahimi, R. Bahrampoury, M. Ghanbarpour
Summary: This paper presents a numerical study on heat sink thermal performance using phase change materials (PCM) and a vapor chamber for heat source cooling, finding that in natural convection, adding PCM and vapor chamber effectively reduces the heat source temperature, while in forced convection, the vapor chamber has a more significant effect and adding PCM may adversely affect heat sink performance.
Article
Thermodynamics
F. Nikkerdar, M. Rahimi, A. A. Ranjbar, R. Pakrouh, R. Bahrampoury
Summary: This study presents a numerical investigation on the performance enhancement of a phase change material (PCM) based heat exchanger combined with a solar air heater for free heating applications during the night-time in moderate climates. The research showed that the heat storage with 110 x 110 number of air channels exhibits the best performance based on various indicators.
Article
Thermodynamics
A. Torbatinezhad, M. Rahimi, A. . A. . Ranjbar, M. Gorzin
Summary: This investigation conducted a numerical analysis of a cooling system for a solar panel in a concentration photovoltaic system. The results show that the application of a heat sink enhanced with pin fins improves heat transfer characteristics, increases electrical efficiency, and reduces heat sink temperature with increasing fins angle.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2021)
Article
Green & Sustainable Science & Technology
Y. Pahamli, M. J. Hosseini, S. Saedi Ardahaie, A. A. Ranjbar
Summary: This paper introduces a novel latent heat storage system for hot water systems, and investigates the impact of various geometrical parameters on the system's performance. The results show that variations in fin number and fin compactness can improve charging time and exergy efficiency, while fin height parameter variations can improve melting performance but with reduced exergy efficiencies. These findings highlight the importance of considering geometric parameters when choosing a suitable heat exchanger based on desired application.
Article
Thermodynamics
Rasool Bahrampoury, Younes Pahamli, Ali Torbatinejad, Mohammad Javad Hosseini
Summary: To improve the thermal efficiency and reduce industrial equipment costs, research has been conducted on the development and performance improvement of power generation cycles. Investigations focusing on Kalina cycles as a power generation system for low-grade heat sources have gained attention. This research studied KCS-11 and Ekalina cycles, introducing the SEKalina cycle as a modification of the Ekalina cycle. The use of an ejector in SEKalina cycle has shown significant improvements in thermal efficiency and net power output compared to EKalina and KCS-11 cycles. The net power output in SEKalina cycle is 2% higher than that of EKalina cycle.
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART A-JOURNAL OF POWER AND 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
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)
