Article
Energy & Fuels
Ciril Arkar, Tej Zizak, Suzana Domjan, Saso Medved
Summary: This article investigates the free cooling techniques for PV cells and compares them with evaporative cooling technique under different climate conditions. The study shows that free cooling of PV cells can be as efficient as evaporative cooling in the hottest and coldest climates, but not in mild climates. The thermal properties of PCM layer play a significant role in the effectiveness of free cooling.
JOURNAL OF ENERGY STORAGE
(2022)
Article
Thermodynamics
Ahmad Al Miaari, Hafiz Muhammad Ali
Summary: This study focuses on a cooling method for a 20 Watt photovoltaic module using phase change material, which improves module performance and efficiency by absorbing and storing heat. By using multiple small containers filled with phase change material, it provides technical feasibility and allows convenient adjustment to adapt to weather changes. The method also reduces the amount of phase change material and prevents leakage issues. Experimental results show that appropriate phase change material can reduce the module's temperature by 10 degrees Celsius and enhance its power performance by 5.23%.
CASE STUDIES IN THERMAL ENGINEERING
(2023)
Article
Energy & Fuels
Sajid Mehmood, Jesus Lizana, Daniel Friedrich
Summary: This study proposes a novel low-energy and resilient cooling solution for extremely hot climates in southern Asia, combining geothermal heat dissipation and latent heat storage. Numerical analysis shows that integrating PCM-based ceiling panels with geothermal heat dissipation can reduce discomfort hours and extend thermal comfort periods, especially in areas with intermittent access to electricity.
JOURNAL OF ENERGY STORAGE
(2023)
Article
Green & Sustainable Science & Technology
Farouk Badr, Ali Radwan, Mahmoud Ahmed, Ahmed M. Hamed
Summary: Conducting outdoor experimental investigations of the performance of a hybrid concentrator photovoltaics/thermoelectric generators system is vital for obtaining reliable performance data under real solar conditions. This study investigated a multi-junction solar cell subjected to a solar concentration ratio of 50 suns using different passive cooling methods. The results showed a significant enhancement in the power output of a CPV-TEG-MCHP-HS system compared to alternate configurations.
Article
Engineering, Environmental
Lu-Yao Yang, Chang-Ping Feng, Lu Bai, Rui-Ying Bao, Zheng-Ying Liu, Ming-Bo Yang, Wei Yang
Summary: The study fabricated flexible shape-stabilized phase change materials (PCMs) with excellent thermal management capability, showing great potential in practical applications for decreasing temperatures of electronic devices and buildings.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Energy & Fuels
Ramy Rabie, Mohamed Emam, Ahmed Elwardany, Shinichi Ookawara, Mahmoud Ahmed
Summary: This study aims to enhance the performance of concentrator photovoltaic cells integrated with passive heat sinks by utilizing combined aluminum fins and phase change materials (PCMs) for passive cooling. The developed design effectively improves the steady state temperature of solar cells and elongates the melting time of PCM materials. Traditional aluminum heat sinks and heat sinks with PCM are unable to control temperature effectively after the PCM materials have fully melted, while the new heat sink design can maintain a steady state temperature even after PCM complete melting.
Article
Green & Sustainable Science & Technology
Sheng Zhang, Pawel Oclon, Jiri Jaromir Klemes, Piotr Michorczyk, Kinga Pielichowska, Krzysztof Pielichowski
Summary: This paper introduces the recent developments in Renewable Energy Systems for building heating, cooling and electricity production with thermal energy storage. The buildings contribute about 40% of total energy consumption, with significant potential for primary energy savings. The application of various Renewable Energy based systems is discussed including: the presentation of Hybrid Renewable Energy bases systems, methodology for their design and methods for the optimisation of Buildings RES.
RENEWABLE & SUSTAINABLE ENERGY REVIEWS
(2022)
Article
Thermodynamics
Sandro Nizetic, Miso Jurcevic, Duje Coko, Muslum Arici, Anh Tuan Hoang
Summary: This study investigated various PVT-PCM solar collector designs and analyzed the thermal properties of PCM materials used in these systems. Results showed that PVT-PCM collector design greatly impacts system efficiency, with electrical efficiency improvement usually less than 20% and thermal efficiency improvement up to 70%. Existing literature lacks in addressing the economic and environmental evaluation of PVT-PCM systems, highlighting the need for further research in this area.
Article
Construction & Building Technology
Shufan Yang, Yuxuan Zhang, Yongling Zhao, Juan F. Torres, Xiaolin Wang
Summary: Passive cooling using phase change materials (PCMs) is a promising technique to stabilize indoor air temperature and reduce building energy demand. This study investigates the phase change behavior and thermal performance of PCM ceiling panels with different geometries. The results show that the pyramid array panel performs better than the tetrahedral-based panel, and hanging the panel enhances heat transfer compared to direct attachment to the ceiling.
ENERGY AND BUILDINGS
(2023)
Article
Chemistry, Physical
Paula F. De Castro, Sergiy Minko, Vladimir Vinokurov, Kirill Cherednichenko, Dmitry G. Shchukin
Summary: Microcapsules loaded with n-docosane as phase change material have been successfully used to impregnate cotton fabrics, providing temperature buffering and increase effects during heating and cooling processes. The impregnated fabrics maintained stable performance even after long-term storage, demonstrating high potential for commercial applications in thermal management.
ACS APPLIED ENERGY MATERIALS
(2021)
Article
Green & Sustainable Science & Technology
Xiangfei Kong, Lanlan Zhang, Han Li, Yongzhen Wang, Man Fan
Summary: The study found that the application of compound parabolic concentrator (CPC) in photovoltaic/thermal (PV/T) system enhances the thermal and electrical energy gain, and the phase change material (PCM) helps cool down the operating temperature of cells. The concentrating photovoltaic/thermal phase change (PV/T-CPCM) system outperforms the concentrating photovoltaic/thermal (PV/T-CPC) system in terms of thermal energy and efficiency, showing superior thermal, electrical, and exergy performance.
Article
Thermodynamics
Muhammad Imran Khan, Faisal Asfand, Sami G. Al-Ghamdi
Summary: Concentrated solar power (CSP) technologies are considered as one of the most promising ways to generate electric power in the future. The integration of efficient and cost-effective thermal energy storage (TES) systems is crucial for the development of CSP technology due to the unstable and intermittent nature of solar energy availability. Over the past decade, phase change materials (PCM) have gained significant interest for CSP applications as a latent heat TES system. This comprehensive review provides an overview of the current state and future challenges of cutting-edge PCM based TES technologies for CSP application, including the functional parts and research progress in each part.
APPLIED THERMAL ENGINEERING
(2023)
Article
Energy & Fuels
T. Surulivel Rajan, N. B. Geetha, S. Rajkumar
Summary: This study evaluates the parametric analysis of thermal behavior of building walls incorporated with PCM, demonstrating a significant reduction in maximum temperature, overall heat flux, thermal amplitude, and time lag with the use of PCM. This can greatly reduce energy consumption and improve thermal comfort inside buildings under hot climatic conditions.
ENERGY SOURCES PART A-RECOVERY UTILIZATION AND ENVIRONMENTAL EFFECTS
(2022)
Article
Materials Science, Ceramics
Yi Wang, Haining Ji, Yongxing Chen, Bin Liu, Jiamei Huang, Mingying Lu, Yangyong Ou, Yong Zhao, Jundong Tao, Yan Huang, Junlong Wang
Summary: Controlling the cooling effect in radiative cooling is a major challenge. This paper proposes a novel radiative cooling device that addresses this challenge by adjusting materials and stress to achieve different cooling modes. The device demonstrates excellent energy-saving capabilities in high-temperature environments and prevents excessive cooling in low-temperature environments.
CERAMICS INTERNATIONAL
(2023)
Article
Construction & Building Technology
Amirhamzeh Farajollahi, Mohsen Rostami, Milad Feili, Diyar N. Qader
Summary: This paper examines the impact of using phase change materials in building walls on the required thermal and cooling energy of the building through numerical analysis. The results suggest that under specific conditions, using a wall with two PCM cavities can significantly reduce energy consumption.
JOURNAL OF BUILDING ENGINEERING
(2022)
Article
Mathematics
Sid Ahmed Ould Ahmed Mahmoud, El Moctar Ould Beiba, Fei Zuo
Summary: This work introduces and studies the concepts of n-quasi-m-hypercontractive and n-quasi-m-hyperexpansive operators on a Hilbert space. Some characterizations of these classes of operators are established, and many algebraic and spectral properties related to the members of these classes are extracted from these characterizations.
LINEAR & MULTILINEAR ALGEBRA
(2023)
Article
Thermodynamics
Mohamed Emam, Aly M. A. Soliman, M. A. Abdelrahman, Ahmed A. A. Attia
Summary: A newly integrated single-junction PV-heat pipe system with innovative heat sink design is proposed and experimentally investigated. The results showed that the heat pipe with an elliptical cross-section area performed better than the one with a circular cross-section area, and the heat pipe filled with Ethanol as the working fluid and a charge ratio of 70% performs better for all operating temperatures tested.
APPLIED THERMAL ENGINEERING
(2023)
Article
Green & Sustainable Science & Technology
Hesham Zaghloul, M. A. Abdelrahman, M. F. Abd Rabbo, Mohamed Emam
Summary: Designing an effective, lightweight, inexpensive, and simple to manufacture heat sink is vital for controlling the temperature of high concentrated triple-junction solar cells. In this study, four different heat sink configurations were investigated for their thermal regulation performance. The results showed that the integration of each heat sink design enabled the cell to operate safely at high concentration ratios, producing large electric power. The environmental analysis revealed that utilizing a specific heat sink configuration could significantly reduce CO2 emissions compared to another configuration at the maximum permissible solar concentration ratio.
JOURNAL OF CLEANER PRODUCTION
(2023)
Article
Medicine, Research & Experimental
Mahmoud S. Ahmed, Ayman B. Farag, Ian N. Boys, Ping Wang, Ivan Menendez-Montes, Ngoc Uyen Nhi Nguyen, Jennifer L. Eitson, Maikke B. Ohlson, Wenchun Fan, Matthew B. McDougal, Katrina Mar, Suwannee Thet, Francisco Ortiz, Soo Young Kim, Ashley Solmonson, Noelle S. Williams, Andrew Lemoff, Ralph J. DeBerardinis, John W. Schoggins, Hesham A. Sadek
Summary: The study aimed to identify therapeutic options for the COVID-19 pandemic through structure-based drug repurposing. FDA-approved drugs were screened for their inhibitory effects against SARS-CoV-2's main protease enzyme (Mpro) substrate-binding pocket. Five promising candidates, including atovaquone and mebendazole, demonstrated antiviral activity against SARS-CoV-2. Atovaquone was also found to potentially inhibit viral replication by targeting host purine metabolism.
BIOMEDICINE & PHARMACOTHERAPY
(2023)
Article
Radiology, Nuclear Medicine & Medical Imaging
Adam D. Yock, Mahmoud Ahmed, Sarah Masick, Manuel Morales-Paliza, Christien Kluwe, Ashwin Shinde, Austin Kirschner, Eric Shinohara
Summary: This study analyzed the clinical experience of CBCT-based daily online adaptive radiotherapy and demonstrated the impact of adaptive triggers on dosimetric and procedural outcomes. The results showed that daily online adaptive radiotherapy improved target coverage in multiple pelvic treatment sites, while the improvement in organ-at-risk metrics was randomly distributed.
JOURNAL OF APPLIED CLINICAL MEDICAL PHYSICS
(2023)
Article
Mechanics
Ahmed Elhanafy, Yasser Abuouf, Samir Elsagheer, Shinichi Ookawara, Mahmoud Ahmed
Summary: Diagnostic technology based on magnetic fields is commonly used in medicine, but exposure to strong electromagnetic fields has adverse effects on patients. This study investigates the effects of external uniform magnetic fields on blood flow in healthy and diseased cases, and determines safe values for field strength. A three-dimensional non-Newtonian flow model is developed to investigate the effects of the magnetic field on shear rate and hematocrit. Numerical simulations are conducted at different field strengths and orientations, and results demonstrate the dominant effect of the magnetic field in the Y-direction.
Article
Clinical Neurology
Hani Chanbour, Jeffrey W. Chen, Lakshmi S. Gangavarapu, Gabriel A. Bendfeldt, Matthew E. LaBarge, Mahmoud Ahmed, Steven G. Roth, Silky Chotai, Leo Y. Luo, Amir M. Abtahi, Byron F. Stephens, Scott L. Zuckerman
Summary: This is a retrospective case-control study that aimed to identify risk factors associated with unplanned readmission after metastatic spine surgery and determine its impact on long-term outcomes. The results showed that postoperative complications were associated with unplanned readmission, and 3-month unplanned readmission was associated with a shorter time to local recurrence and decreased overall survival.
Editorial Material
Pharmacology & Pharmacy
Mahmoud Ahmed, Deok Ryong Kim
FRONTIERS IN PHARMACOLOGY
(2023)
Article
Thermodynamics
Mohamed M. Elsabahy, Mohamed Emam, Hidetoshi Sekiguchi, Mahmoud Ahmed
Summary: Characteristic performance maps (CPMAPs) are developed to solve the tradeoff between electrical generation and thermal utilization in solar cell systems. Several variables related to thermal, energy, and exergy are obtained using a validated thermo-fluid model. The findings show that maximizing the electrical exergy efficiency suggests non-concentrated solar cells with moderate cooling, while maximizing power generation requires high concentration ratios and reduced heat sink temperature. Maximizing overall exergy efficiency depends on the combination of concentration ratio and heat transfer coefficient based on the application temperature demand.
ENERGY CONVERSION AND MANAGEMENT
(2023)
Article
Thermodynamics
H. A. Refaey, Mathkar A. Alharthi, Samir Bendoukha, Said Ghani Khan, Mohamed Emam, M. A. Abdelrahman
Summary: This study evaluates the energy, exergy, and environmental performance of concentrated triple junction photovoltaic (CPV TJ) cells with different concentration ratios in hot weather conditions in Saudi Arabia. The results show that the size and design of the heat sinks significantly impact the efficiency and weight of the cells. The study also demonstrates that combining the TJ cells with heat sinks can reduce carbon emissions.
CASE STUDIES IN THERMAL ENGINEERING
(2023)
Article
Thermodynamics
Alaa Hamada, Mohamed Emam, H. A. Refaey, M. Moawed, M. A. Abdelrahman
Summary: This study proposes an innovative water-based PVT system coupled with phase change material (PCM) capsules to maximize the performance of photovoltaic panels in terms of power generation and thermal utilization. Experiments conducted in Cairo, Egypt showed that the actively cooled PVT-PCM panel achieved the highest electrical and thermal energy gain, surpassing the passively cooled and reference PV panels.
Article
Thermodynamics
Youssef A. Marei, Mohamed Emam, Mohamed E. A. E. Ahmed, Ahmed A. A. Attia, M. A. Abdelrahman
Summary: With the increasing global attention on energy consumption in buildings and the negative impact of carbon dioxide emissions on climate change, there has been a growing emphasis on sustainability and energy savings in buildings. This study investigates and compares the energy-saving capabilities of different transparent wall configurations under various environmental conditions. The findings suggest that integrating photovoltaics with building facades or basic glass walls can significantly contribute to energy savings.
ENERGY CONVERSION AND MANAGEMENT
(2024)
Article
Management
Mahmoud Ahmed
Summary: This paper investigates how women's representation on corporate boards affects financial reporting quality. The study finds that increasing women's representation on boards reduces undue CEO influence over the board and improves accounting quality. However, this effect is only significant in the long run and is attenuated for larger firms and larger boards.
INTERNATIONAL JOURNAL OF DISCLOSURE AND GOVERNANCE
(2023)
Article
Thermodynamics
Pengcheng Zhao, Jingang Wang, Liming Sun, Yun Li, Haiting Xia, Wei He
Summary: The production of green hydrogen through water electrolysis is crucial for renewable energy utilization and decarbonization. This research explores the optimal electrode configuration and system design of compactly-assembled industrial electrolyzer. The findings provide valuable insights for industrial application of water electrolysis equipment.
ENERGY CONVERSION AND MANAGEMENT
(2024)
Article
Thermodynamics
V. Baiju, P. Abhishek, S. Harikrishnan
Summary: Thermally driven adsorption desalination systems (ADS) have gained attention as an eco-friendly solution for water scarcity. However, they face challenges related to low water productivity and scalability. To overcome these challenges, integrating ADS with other desalination technologies can create a small-scale hybrid system. This study proposes integrating ADS with a Thermo Electric Dehumidification (TED) unit to enhance its performance.
ENERGY CONVERSION AND MANAGEMENT
(2024)
Article
Thermodynamics
C. X. He, Y. H. Liu, X. Y. Huang, S. B. Wan, Q. Chen, J. Sun, T. S. Zhao
Summary: A decentralized centroid multi-path RC network model is constructed to improve the temperature prediction accuracy compared to traditional RC models. By incorporating multiple heat flow paths and decentralizing thermal capacity, a more accurate prediction is achieved.
ENERGY CONVERSION AND MANAGEMENT
(2024)
Article
Thermodynamics
Chaoying Li, Meng Wang, Nana Li, Di Gu, Chao Yan, Dandan Yuan, Hong Jiang, Baohui Wang, Xirui Wang
Summary: There is an urgent need to shift away from heavy dependence on fossil fuels and embrace renewable energy sources, particularly in the energy-intensive oil refining process. This study presents an innovative concept called the Solar Oil Refinery, which applies solar energy in oil refining. A solar multi-energies-driven hybrid chemical oil refining system that utilizes solar pyrolysis and electrolysis has been developed, significantly improving solar utilization efficiency, cracking rate, and hydrogen yield.
ENERGY CONVERSION AND MANAGEMENT
(2024)
Article
Thermodynamics
Chao Ma, Guanghui Wang, Dingbiao Wang, Xu Peng, Yushen Yang, Xinxin Liu, Chongrui Yang, Jiaheng Chen
Summary: This study proposes a bio-inspired fish-tail wind rotor to improve the wind power efficiency of the traditional Savonius rotor. Through transient simulations and orthogonal experiments, the key factors affecting the performance are identified. A response surface model is constructed to optimize the power coefficient, resulting in an improvement of 9.4% and 6.6% compared to the Savonius rotor.
ENERGY CONVERSION AND MANAGEMENT
(2024)
Article
Thermodynamics
Sina Bahmanziari, Abbas-Ali Zamani
Summary: This paper proposes a new framework for improving electrical energy harvesting from piezoelectric smart tiles through a combination of magnetic plucking, mechanical impact, and mechanical vibration force mechanisms. Experimental results demonstrate a significant increase in energy yield and average energy harvesting time compared to other mechanisms.
ENERGY CONVERSION AND MANAGEMENT
(2024)
Article
Thermodynamics
Nanjiang Dong, Tao Zhang, Rui Wang
Summary: This study establishes a multiobjective mixed-variable configuration optimization model for a comprehensive combined cooling, heating, and power energy system, and proposes an efficient generating operator to optimize this model. The experimental results show that the proposed algorithm performs better than other state-of-the-art algorithms.
ENERGY CONVERSION AND MANAGEMENT
(2024)
Article
Thermodynamics
Ahmed E. Mansy, Eman A. El Desouky, Tarek H. Taha, M. A. Abu-Saied, Hamada El-Gendi, Ranya A. Amer, Zhen-Yu Tian
Summary: This study aims to convert office paper waste into bioethanol through a sustainable pathway. The results show that physiochemical and enzymatic hydrolysis of the waste can yield a high glucose concentration. The optimal conditions were determined using the Box-Behnken design, and a blended membrane was used for ethanol purification.
ENERGY CONVERSION AND MANAGEMENT
(2024)
Article
Thermodynamics
Sven Klute, Marcus Budt, Mathias van Beek, Christian Doetsch
Summary: Heat pumps are crucial for decarbonizing heat supply, and steam generating heat pumps have the potential to decarbonize the industrial sector. This paper presents the current state, technical and economic data, and modeling principles of steam generating heat pumps.
ENERGY CONVERSION AND MANAGEMENT
(2024)
Article
Thermodynamics
Le Zhang, To-Hung Tsui, Yen Wah Tong, Pruk Aggarangsi, Ronghou Liu
Summary: This study investigates the effectiveness of a current-carrying-coil-based magnetic field in promoting anaerobic digestion of chicken manure. The results show that the applied magnetic field increases methane yield, decreases carbon dioxide production, and reduces the concentration of ammonia nitrogen. Microbial community analysis reveals the enrichment of certain methanogenic genera and enhanced metabolic pathways. Pilot-scale experiments confirm the technical effectiveness of the magnetic field assistance in enhancing anaerobic digestion of chicken manure.
ENERGY CONVERSION AND MANAGEMENT
(2024)
Article
Thermodynamics
Bo Chen, Ruiqing Ma, Yang Zhou, Rui Ma, Wentao Jiang, Fan Yang
Summary: This paper presents an advanced energy management strategy for fuel cell hybrid electric heavy-duty vehicles, focusing on speed planning and energy allocation. By utilizing predictive co-optimization control, this strategy ensures safe inter-vehicle distance and minimizes energy demand. Simulation results demonstrate the effectiveness of the proposed method in reducing fuel cell degradation cost and overall operation cost.
ENERGY CONVERSION AND MANAGEMENT
(2024)
Article
Thermodynamics
Fabio Fatigati, Roberto Cipollone
Summary: Organic Rankine Cycle-based microcogeneration systems that use solar sources to generate electricity and hot water can help reduce CO2 emissions in residential energy-intensive sectors. The adoption of a recuperative heat exchanger in these systems improves efficiency, reduces thermal power requirements, and saves on electricity costs.
ENERGY CONVERSION AND MANAGEMENT
(2024)
Article
Thermodynamics
Lipeng He, Renwen Liu, Xuejin Liu, Xiaotian Zheng, Limin Zhang, Jieqiong Lin
Summary: This research proposes a piezoelectric-electromagnetic hybrid energy harvester (PEHEH) for low-frequency wave motion and self-sensing wave environment monitoring. The PEHEH shows promising power output and the ability to self-power and self-sense the wave environment.
ENERGY CONVERSION AND MANAGEMENT
(2024)
Article
Thermodynamics
Shangling Chu, Yang Liu, Zipeng Xu, Heng Zhang, Haiping Chen, Dan Gao
Summary: This paper studies a distributed energy system integrated with solar and natural gas, analyzes the impact of different parameters on its energy utilization and emissions reduction, and obtains the optimal solution through an optimization algorithm. The results show that compared to traditional separation production systems, this integrated system achieves higher energy utilization and greater reduction in carbon emissions.
ENERGY CONVERSION AND MANAGEMENT
(2024)
Article
Thermodynamics
Qingpu Li, Yaqi Ding, Guangming Chen, Yongmei Xuan, Neng Gao, Nian Li, Xinyue Hao
Summary: This paper proposes and studies a piston-type thermally-driven pump with a structure similar to a linear compressor, aiming to eliminate the high-quality energy consumption of existing pumps and replace mechanical pumps. The coupling mechanism of working fluid flow and element dimension is analyzed based on force analysis, and experimental data analysis is used to determine the pump operation stroke. Theoretical simulation is conducted to analyze the correlation mechanism of the piston assembly. The research shows that the thermally-driven pump can greatly reduce power consumption and has potential for industrial applications.
ENERGY CONVERSION AND MANAGEMENT
(2024)
