Article
Thermodynamics
Hong-Jin Joo, Hee-Youl Kwak, Minsuk Kong
Summary: The present study experimentally investigates the effect of twisted tape inserts on the thermal performance of an eccentric inlet and outlet heat pipe evacuated-tube solar thermal collector (HP-ESTC). The results show that the addition of twisted tape inserts enhances heat transfer performance by eliminating stagnation flow, reducing flow skewness, and generating rotating flow. A comprehensive performance analysis considering both heat transfer and pressure drop characteristics confirms that using twisted tape inserts can improve overall performance by approximately 7.7%. To assess its applicability for commercial HP-ESTCs, an HP-ESTC containing twisted tape inserts was manufactured and tested outdoors.
Article
Thermodynamics
Mesay Siyoum Gudeta, Samson Mekbeb, Migbaru Shibeshi, Eneyw Gardie
Summary: This study investigates the use of solar energy as a source for water heating systems in Ethiopia, aiming to reduce the reliance on conventional energy sources and achieve significant energy savings and emission reductions. By adjusting the tilt angles, the collection efficiency of solar radiation can be greatly improved. The findings also indicate that the system efficiency increases with the increase in heat transfer fluid flow rate. This research has important implications for achieving sustainable energy supply and environmental protection in Ethiopia.
CASE STUDIES IN THERMAL ENGINEERING
(2022)
Article
Thermodynamics
Kishor Deshmukh, Suhas Karmare, Pradeep Patil
Summary: The convective heat transfer performance of U-pipe evacuated tube solar thermal collector with TiN nanofluid was investigated in this study. TiN nanoparticles with sizes of 40-50 nm were dispersed in distilled water at different volume concentrations. The stability and thermophysical properties of TiN nanofluid were experimentally measured. The experimental investigation included the convective heat transfer coefficient, friction factor characteristic, and solar thermal efficiency at different volume concentrations and mass flow rates. The performance of the solar thermal collector was tested under outdoor conditions. A correlation was proposed to determine the Nusselt number, friction factor, and solar thermal efficiency in laminar flow. The TiN nanofluid was recommended for industrial solar thermal applications due to its notable improvement in convective heat transfer performance despite the friction factor penalty.
APPLIED THERMAL ENGINEERING
(2023)
Article
Environmental Sciences
Alicja Siuta-Olcha, Tomasz Cholewa, Kinga Dopieralska-Howoruszko
Summary: This study presents the experimental results on the energy performance of an evacuated solar collector, heat pipe type, in different weather conditions and operating parameters. The research defines the thermal and exergy efficiencies of the solar collector and shows that increasing wind speed significantly decreases both efficiency values.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2021)
Article
Green & Sustainable Science & Technology
Santanu Malakar, Vinkel Kumar Arora, Prabhat K. Nema
Summary: The study designed and developed an evacuated tube collector-based solar dryer with heat pipe for drying garlic cloves. Experimental results showed that the dryer performed best at an air flow velocity of 2 m/s, capable of efficiently drying garlic cloves within 8 hours with a short payback period of 1.3 years.
Article
Multidisciplinary Sciences
Nokwanda Mthembu, Lagouge Tartibu, Jean Gad Mukuna
Summary: In this study, a thermal resistance network model was developed for an evacuated tube heat pipe, and the impact of adding an I-section geometry insert on the system performance was analyzed. The results indicate that the addition of the insert reduces the total thermal resistance and improves the efficiency.
ARABIAN JOURNAL FOR SCIENCE AND ENGINEERING
(2023)
Article
Thermodynamics
Shady M. Henein, Ahmed A. Abdel-Rehim
Summary: In this study, the effect of using MgO/MWCNT hybrid nanofluid on the thermal performance of the evacuated tube solar collector was investigated. The results showed that increasing the weight ratios of MWCNTs nanoparticles and volume flow rate improved the energy and exergy efficiencies of the collector. Furthermore, MgO/MWCNT (50:50) hybrid nanofluid performed better than other hybrid nanofluids at all volume flow rates.
CASE STUDIES IN THERMAL ENGINEERING
(2022)
Article
Thermodynamics
Ismail Ozcan, Ahmet Ozsoy, Arif Emre Ozgur, Mustafa Karaboyaci
Summary: This study investigates the thermal efficiency and pressure drop of a solar collector with serial connected U-pipe evacuated tubes, using nanofluid of different concentration ratios. It was found that the efficiency increased by 14.3% to 22.1% compared to water when using a 2% concentration nanofluid with decreasing reduced temperature. The highest collector efficiency was approximately 80% with a 2% TiO2 concentrated nanofluid.
APPLIED THERMAL ENGINEERING
(2023)
Article
Thermodynamics
Azim Dogus Tuncer, Ipek Aytac, Halil Ibrahim Variyenli, Ataollah Khanlari, Sedat Mantici, Alim Kararti
Summary: This study aims to improve the thermal performance of heat pipe evacuated tube solar collectors (HP-ETSCs) by replacing the working fluid with magnetic nanofluid. The results showed that utilizing NiFe2O4/water magnetic nanofluid as the working fluid in the HP-ETSC significantly increased the thermal performance and exergy efficiency of the system.
THERMAL SCIENCE AND ENGINEERING PROGRESS
(2023)
Article
Energy & Fuels
A. Allouhi, M. Benzakour Amine
Summary: This study aims to characterize the performance of a heat pipe flat plate solar collector using different nanofluids, with CuO-based nanofluid showing the highest enhancements in energetic and exergetic efficiencies. The decrease in specific heat of nanofluids is identified as the main thermal property responsible for performance improvement.
SOLAR ENERGY MATERIALS AND SOLAR CELLS
(2021)
Article
Energy & Fuels
Moucun Yang, Liming Zhi, Kelong Diao, Yuezhao Zhu, Robert A. Taylor
Summary: A new solar collector was designed for producing mid-temperature heat, with a unique structure and coating. Genetic algorithm was used to optimize the collector's parameters, and theoretical and numerical analysis were conducted for its optical and thermal performance. The results showed that the collector had an optical efficiency of 57.6% and a thermal efficiency of 30.6% at 250 degrees C.
Article
Green & Sustainable Science & Technology
S. Mojtaba Tabarhoseini, M. Sheikholeslami
Summary: This research focused on examining the thermal characteristic of a thermosyphon evacuated tube collector for domestic use and modifying the structure by adding longitudinal fins within the absorber to enhance thermal efficiency. Computational fluid dynamics were used to study the efficacy of water-based Cu and MWCNT nanofluids in different volume fractions on the collector's performance. The analysis also discussed the impact of variations in solar radiation incidence angles on fluid flow structure and average tank temperature, revealing improvements in heat transfer and system's thermal efficiency with the employment of longitudinal fins.
SUSTAINABLE ENERGY TECHNOLOGIES AND ASSESSMENTS
(2022)
Article
Energy & Fuels
Mohamad Aramesh, Bahman Shabani
Summary: This study presents a novel self-storing design of evacuated tube solar collector (ETSC) with a PCM-MF composite, which shows superior performance in storage and transfer of solar thermal energy compared to designs with pure PCM or PCM-fin composite. Despite containing less mass of PCM, the design with PCM-MF composite achieves higher maximum output temperature and stores more thermal energy. It also demonstrates longer temperature maintenance during periods without solar energy input.
JOURNAL OF ENERGY STORAGE
(2023)
Article
Energy & Fuels
A. Veera Kumar, T. V. Arjunan, D. Seenivasan, R. Venkatramanan, S. Vijayan
Summary: The thermal performance of an evacuated tube solar air collector with inserted baffles was investigated through experiments and analysis, showing that inserted baffles can enhance heat transfer efficiency. Increasing the length of the baffles has a positive impact on temperature rise and thermal efficiency, but also results in higher pumping power.
Review
Thermodynamics
Hong Li, Hongyuan Liu, Min Li
Summary: This paper provides a comprehensive overview of heat pipe based solar collectors (HP-SCs), summarizing their classification, performance evaluation and optimization, and effective improvements. It discusses the common features and relationships between HP-STCs and HP-PV/T technology. The paper concludes with remarks on application situations, performance analysis and comparison, and identifies new research directions and potentials in this field.
Article
Environmental Sciences
Hitesh Panchal, Ali Sohani, Nguyen Van Nguyen, Shahin Shoeibi, Mehdi Khiadani, Pham Quang Huy, Siamak Hoseinzadeh, Abd Elnaby Kabeel, Saboor Shaik, Erdem Cuce
Summary: This study investigates the impact of using evacuated tubes solar collector, perforated fins, and pebbles on the performance enhancement of a solar still. The results show that these methods significantly increase evaporation rate and distillate output, while reducing costs and CO2 emissions.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2023)
Article
Environmental Sciences
Mahmoud Elgendi, Abd Elnaby Kabeel, Fadl Abdelmonem Essa
Summary: Solar still is a cheap and decentralized method for obtaining potable water from saline water using solar energy, but it has low productivity. Previous studies have shown that using pin fins in the absorber can increase the efficiency and yield of solar still. However, this study found that heat sinks have a weak impact on the performance of solar still, suggesting that the previous conclusion needs further investigation.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2023)
Article
Engineering, Chemical
Swellam W. Sharshir, Mohamed A. Farahat, Abanob Joseph, A. W. Kandeal, M. A. Rozza, Fawzy Abou-Taleb, A. E. Kabeel, Zhanhui Yuan
Summary: The thermal, cost, and environmental analyses of a five-slope trapezoidal solar still and its comparison with a conventional single-slope solar still are evaluated. Three promising modifications are applied to improve freshwater productivity, including thin film evaporation, cover cooling, and the use of reflectors. The best case shows a significant increase in freshwater productivity, as well as improved thermal and exergy efficiency. The environmental analysis also indicates a reduction in CO2 emissions and potential carbon credit.
Article
Environmental Sciences
Mohammed El Hadi Attia, Abd Elnaby Kabeel, Ayman Refat Abd Elbar, Mohamed Abdelgaied, Abd Elkader Abdallah
Summary: The present study aims to achieve the highest cumulative yield of the hemispherical distillers by designing and constructing new reflector mirrors (truncated circular cone-shaped reflector mirrors). The experimental results indicate that utilizing reflector mirrors with a 25 degrees inclination angle achieves the maximum cumulative yield, with an improvement of 42.74% compared to traditional reflector mirrors.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2023)
Article
Environmental Sciences
Arani Rajendra Prasad, Ravishankar Sathyamurthy, Abd Elnaby Kabeel, Meganathan Sudhakar
Summary: The present experimental study aims to improve the efficiency of freshwater production by a single solar still, and investigates the factors affecting its performance. The results show that an integrated system can increase the generation of drinkable water, but increasing the flow velocity of distilled water reduces the efficiency. Additionally, the flowrate of fluid and the depth of water also have an impact on the efficiency of the system.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2023)
Article
Environmental Sciences
Saleh Shalaby, Abd Elnaby Kabeel, Bahaa Eddin Moharram, Areeg Shama, Hatem Abosheiasha Abosheiasha
Summary: In this study, a latent heat storage system was integrated with a single basin solar still. The results showed that the storage system improved the daily productivity of fresh water and had the potential to reduce costs in large-scale applications.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2023)
Article
Energy & Fuels
Habib Ben Bacha, Abdelkader Saad Abdullah, Mutabe Aljaghtham, Reda S. Salama, Mohamed Abdelgaied, Abd Elnaby Kabeel
Summary: Recently, a system incorporating geothermal energy and photovoltaic/thermal panels was proposed to reduce the rates of electrical energy consumption in reverse osmosis desalination plants. The results showed that incorporating geothermal energy and photovoltaic/thermal panels has positive effects in terms of increasing productivity and reducing specific power consumption in RO desalination plants. The average savings in specific power consumption reached 29.1% and 40.75% for seawater and brackish water treatment, respectively. Additionally, the economic feasibility showed cost savings of up to 39.6% for freshwater production.
Article
Green & Sustainable Science & Technology
Nafila Smakdji, Abderrahmane Khechekhouche, Mohamed Abdelgaied, Abd Elnaby Kabeel, Ali Sadoun, Sayed A. Ward
Summary: Renewable energy-based desalination systems are important for addressing climate damage caused by fossil fuel-based systems. This study explores the use of industrial coal debris as energy storage material to improve the performance of solar stills. The results showed that carbon debris increased productivity and thermal efficiency, and the investment in building the solar stills was recovered within a short period of time.
ENVIRONMENTAL PROGRESS & SUSTAINABLE ENERGY
(2023)
Article
Green & Sustainable Science & Technology
Mohammed El Hadi Attia, Abd Elnaby Kabeel, Azzeddine Beggas, Mohamed Abdelgaied
Summary: This study aims to enhance the production rate of drink water from hemispherical solar distillers by using red bricks filled with cement as low-cost storage materials. Experimental investigations were conducted on different heights (1, 2, and 3 cm) and gap distances (4 and 6 cm) of red brick tiles to determine the optimal height and gap distance that achieve the highest productivity of hemispherical distillers. The results showed that red brick tiles filled with cement at a height of 2 cm and a gap distance of 4 cm demonstrated the best performance of hemispherical distillers.
ENVIRONMENTAL PROGRESS & SUSTAINABLE ENERGY
(2023)
Article
Water Resources
Abd Elnaby Kabeel, Mohammed El Hadi Attia, Abdelkader Bellila, Wael M. El-Maghlany, Mohamed Fayed, Abdelkader Saad Abdullah, Iham F. Zidane
Summary: In this study, the impact of corrugated absorber shape on the performance of hemispherical solar stills was investigated through experiments. Four geometric corrugated shapes were tested: flat, triangular, semi-circular, and square. The results showed that the triangular corrugated absorber shape had the highest thermal efficiency, with a 48.96% increase in total freshwater yield compared to the conventional distiller.
APPLIED WATER SCIENCE
(2023)
Article
Green & Sustainable Science & Technology
Abdelkrim Khelifa, A. E. Kabeel, Mohammed El Hadi Attia, Mohamed E. Zayed, Mohamed Abdelgaied
Summary: This study presents a detailed numerical analysis of the thermal performance of PVT solar collectors integrated with flax fibers as natural porous materials. The optimal design for cooling photovoltaic panels is achieved by incorporating porous flax fibers materials with a thickness of 50 mm and a cooling water flowrate of 0.907 m/s. The thermal efficiencies of the PVT system using water with a flax fibers layer, pure water, and air are 69.58%, 50.02%, and 34.60%, respectively.
Article
Energy & Fuels
Eman Ashraf, A. E. Kabeel, Yehia Elmashad, Sayed A. Ward, Warda M. Shaban
Summary: Solar stills are an eco-friendly and efficient method for generating drinking water. This paper proposes a novel model, named Enhanced Genetic Algorithm - Multi-Layer Perceptron (EGA-MLP), to predict the productivity of Hemispherical Solar Stills (SSs). The EGA-MLP model outperforms standalone MLP and Particle Swarm Optimization with MLP (PSO-MLP) models, achieving higher accuracy in predicting SS yield and demonstrating potential for improving SS system design and optimization.
Article
Energy & Fuels
Abd Elnaby Kabeel, Mohamed Abdelgaied, Mohammed El Hadi Attia, Muslum Arici, Moataz M. Abdel-Aziz
Summary: Conical solar stills have advantages over simple solar stills. Through experimental tests on conical solar stills with different inclination angles, it is determined that CoSS with a 30 degrees inclination angle provides the best performance.
Editorial Material
Chemistry, Multidisciplinary
Marcos Tostado-Veliz, Salah Kamel, Abd Elnaby Kabeel
APPLIED SCIENCES-BASEL
(2023)
Article
Environmental Sciences
Khaled Ramzy, Mohamed Abdelgaleel, Abd Elnaby Kabeel, Heba Mosalam
Summary: This study aimed to improve the performance and productivity of solar stills by using different absorbing materials. Steel wool pads achieved the highest productivity at 4.384 l/m(2) and the highest thermal efficiency at 32.74%. The cost per liter was the lowest with steel wool pads at 0.0034 $/l/m(2), and incorporating them was the most promising modification for enhancing solar still performance.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(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)
