Article
Thermodynamics
A. M. Alklaibi, L. Syam Sundar, A. C. M. Sousa
Summary: The experimental results demonstrate that the parameters are strongly influenced by changes in solar irradiation. The highest collector thermal efficiency is achieved by using 1.0 vol% ND/water nanofluid, showing a 12.7% increase compared to pure water. Furthermore, the study reveals that the nanofluid is more sensitive to entropy generation than water as the working fluid.
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
(2021)
Article
Thermodynamics
M. Sheikholeslami, Seyyed Ali Farshad, Zafar Said
Summary: The research demonstrates that using aluminum oxide nanomaterial as a turbulator can enhance the flow of nanofluids, improving heat transfer efficiency. The values of Be and Phi s vary with different Re and TTn, showing that turbulators can reduce exergy losses.
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
(2021)
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
Thermodynamics
Evangelos Bellos, Christos Tzivanidis
Summary: This study investigates the performance of an efficient evacuated flat plate collector and develops a correlation for the daily useful output. The results show that the optimum exergy efficiency is 13.33% at an operating temperature of 125 degrees C, with a corresponding thermal efficiency of 47.24%.
APPLIED THERMAL ENGINEERING
(2023)
Article
Thermodynamics
Latif Aref, Rasoul Fallahzadeh, Seyed Reza Shabanian, Mojtaba Hosseinzadeh
Summary: The study aims to increase the thermal efficiency of a flat plate closed-loop pulsating heat pipe solar collector by introducing a novel closed-loop pulsating heat pipe (CLPHP) with a dual-diameter structure. Experimental results show that the thermal performance of the dual-diameter configuration is considerably better than the single-diameter in different inclination angles, achieving a thermal efficiency of 72.4% under sunny weather conditions.
Article
Environmental Sciences
Noushin Azimy, Mohammad Reza Saffarian, Aminreza Noghrehabadi
Summary: This research aims to increase the heat transfer efficiency of flat-plate solar collectors by designing the collector pipe in a zigzag shape. Through a 3D coupled investigation and analysis of fly ash-Cu/water hybrid nanofluids, the study found that the zigzag pipe design improves thermal efficiency compared to conventional straight pipes. Additionally, increasing mass flow rate, temperature, and irradiation leads to higher Nusselt numbers.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2022)
Article
Thermodynamics
Dengjia Wang, Zhelong Mo, Yanfeng Liu, Yuchao Ren, Jianhua Fan
Summary: Increasing the collector dimensions effectively improves the thermal performance of FPSCs, with LSFPSCs outperforming conventional FPSCs in parallel. The collector efficiency of LSFPSCs is higher than that of conventional FPSCs, especially under low solar irradiance, low ambient temperatures, and high mass flow rates. Additionally, LSFPSCs excel in solar-energy rich areas, with Lhasa having the longest daily operating time among the studied cities and a useful energy proportion of about 55%.
Article
Thermodynamics
Hassan Hajabdollahi, Mohammadreza Khosravian, Mohammad Shafiey Dehaj
Summary: This study models and optimizes a solar network heater using flat plate collectors, considering both cost ratio and exergy efficiency as objective functions. The results show that the device is not cost-effective in the case of high collector efficiency.
Article
Green & Sustainable Science & Technology
Saeed Aghakhani, Masoud Afrand, Arash Karimipour, Rasool Kalbasi, Mohammad Mehdi Razzaghi
Summary: This study investigates the performance of a flat plate solar collector with a spiral pipe containing water through numerical and experimental research. The results show that increasing the outer diameter of the spiral and the diameter of the collector pipe enhances the average temperature and heat transfer coefficient, while reducing the flow rate decreases these parameters. Moreover, the pressure drop and pumping power are influenced by the flow rate, outer diameter of the spiral, and pipe diameter.
SUSTAINABLE ENERGY TECHNOLOGIES AND ASSESSMENTS
(2022)
Article
Green & Sustainable Science & Technology
K. Farhana, K. Kadirgama, Hussein A. Mohammed, D. Ramasamy, M. Samykano, R. Saidur
Summary: The study shows that using Al2O3 and CNC nanofluids can increase the efficiency of solar collectors, with good to moderate stability performance of the nanofluids. The thermal conductivity of nanofluids increases while viscosity decreases with increasing temperature. Nanofluids have the potential to enhance the efficiency of flat-plate solar collectors.
SUSTAINABLE ENERGY TECHNOLOGIES AND ASSESSMENTS
(2021)
Article
Chemistry, Multidisciplinary
R. M. Mostafizur, M. G. Rasul, M. N. Nabi, R. Haque, M. I. Jahirul
Summary: The performance of hybrid nanofluids in a flat plate solar collector was analyzed in this study based on various parameters. Five different base fluids were used to create five types of hybrid nanofluids containing CuO and MWCNT nanoparticles. The results showed that the CuO-MWCNT/water nanofluid performed the best in reducing entropy generation and had higher exergy efficiency and thermal performance.
Article
Engineering, Multidisciplinary
Ambarish Maji, Tuhin Deshamukhya, Gautam Choubey
Summary: In this study, four flat-plate solar collectors with similar dimensions were simulated using CFD approach. The effect of channel geometry on the collector's performance was investigated, and it was found that model 3 performed the best when the number of turns was maximum.
ENGINEERING ANALYSIS WITH BOUNDARY ELEMENTS
(2023)
Article
Green & Sustainable Science & Technology
Majid Ahmadlouydarab, Tahereh Dana Anari, Alireza Akbarzadeh
Summary: This research investigates the efficiency of energy absorption in a cylindrical solar collector and two flat plate solar collectors. The results show that increasing the concentration of nanofluid enhances the heat absorption efficiency of the collectors, and the flat plate solar collector with a smaller exposed surface area has the highest absorption efficiency. Additionally, experiments with shorter heat absorption time yield higher energy absorption efficiency.
Article
Environmental Sciences
Shiva Singh, Kuwar Mausam, Subrata Kumar Ghosh, Arun Kumar Tiwari
Summary: The study investigates the thermal performance of a solar flat plate collector using water and Cu-MWCNTs nanoparticle-based hybrid nanofluid through experimental and numerical approaches. X-ray diffraction and FESEM with EDAX mapping were used to characterize the nanoparticles. The experimental setup examined various parameters such as flow rates, inclination angle, volume concentration, and intensity, while a 3D numerical model was developed to simulate the collector's performance. The results showed improved efficiency and validated the use of numerical simulations to observe temperature and flow patterns in flat plate collectors with nanofluids.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2023)
Review
Environmental Sciences
Aaradhya Sharma, Neha Gunreddy, Akshith Reddy Mulamalla, Sakthivadivel Duraisamy, Suresh Sivan, Ganesh Kumar Poongavanam, Balaji Kumar
Summary: The paper aims to identify effective methods to enhance the conductive and convective heat transfer of a solar flat plate collector (FPSC). Various component enhancements and the use of different nanofluids for convective heat transfer in FPSC are reviewed in detail. The paper also provides suggestions for future research in this area. The findings and data presented in this review are valuable for researchers in the field of solar energy.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2022)
Article
Materials Science, Multidisciplinary
Kh. Hosseinzadeh, M. A. Erfani Moghaddam, SeyedKeivan Nateghi, Mohammad Behshad Shafii, D. D. Ganji
Summary: This study aimed to maximize thermal performance by simulating a curved porous star-shaped enclosure with a rounded cavity. The temperature difference between the inner cavity and outer surface stirred the heat flux. By investigating factors such as porosity, radiation intensity, magnetic field, and natural convection, optimal values were determined.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2023)
Article
Chemistry, Physical
M. Habibnia, M. Sheikholeslami, S. M. Tabarhoseini, Ali Taheri, M. Sheykhi
Summary: This study focuses on the evaluation of cutting fluids in the turning process. The results show that employing nanofluid minimum quantity lubrication strategy can lead to an average temperature reduction of about 60% in the cutting tool during Mo40 steel turning. Furthermore, increasing the concentration of the nanofluid can further decrease the temperature.
JOURNAL OF MOLECULAR LIQUIDS
(2023)
Article
Physics, Applied
Payam Jalili, Hossein Narimisa, Bahram Jalili, D. D. Ganji
Summary: This study investigated a rotating system of micro-polar nanofluid between two parallel plates under the influence of magnetic and electric fields. The impacts of Nusselt number, skin friction, and Sherwood number on temperature, velocity, and concentration distribution were discussed. The results demonstrated the effects of rotation, Brownian motion, thermophoresis analysis, and Hall current on the micro-polar nanofluid.
MODERN PHYSICS LETTERS B
(2023)
Article
Energy & Fuels
M. Sheikholeslami, Hazim R. A. Al-Hussein
Summary: This study focuses on the unsteady flow within a solar system using the Trombe wall technique. To improve the productivity of the classic Trombe wall, a paraffin layer is combined with other layers. Adding alumina nanoparticles to the paraffin enhances its conduction mode. The positioning of the PCM layer is analyzed, and placing it in the middle results in the minimum heat loss from the walls.
JOURNAL OF ENERGY STORAGE
(2023)
Article
Energy & Fuels
M. Sheikholeslami, M. Jafaryar
Summary: In current work, it has been suggested to invent new fins with vase-shaped to incorporate in the storage enclosure in order to decrease energy consumption. The combination of heat storage with the shape of a triplex tube and a parabolic solar unit enhances efficiency. The properties of paraffin were improved by dispersing SiO2 nanoparticles. Different proposed models were analyzed using the finite volume method to determine the best arrangement for maximum efficiency and minimum charging time.
JOURNAL OF ENERGY STORAGE
(2023)
Article
Energy & Fuels
Hossein Nabi, Mosayeb Gholinia, Mehdi Khiadani, Abdellah Shafieian
Summary: This paper investigates the impact of red wine-rGO/H2O nanofluid and paraffin wax on the thermohydraulic properties of a photovoltaic/thermal system. Numerical simulations demonstrate that innovative serpentine tube designs significantly enhance the system's performance. The use of environmentally friendly materials such as red wine-rGO/H2O nanofluid and paraffin wax further improves the electrical and thermal efficiency of the system.
Article
Mathematics, Interdisciplinary Applications
Hossein Jafari, Roghayeh Moallem Ganji, Davood Domiri Ganji, Zakia Hammouch, Yusif S. S. Gasimov
Summary: In this paper, the study of fuzzy differential equations (FDEs) in fuzzy calculus is discussed, which provides a proper model to address real problems with uncertainties. Specifically, a class of fuzzy differential equations (FFDEs) with non-integer or variable order (VO) is considered. The main problem is converted to a new problem by utilizing the r-cut representation and is solved using operational matrices (OMs) based on shifted Legendre polynomials (SLPs), leading to a system of nonlinear algebraic equations. The accuracy of the proposed technique is confirmed with an example.
FRACTALS-COMPLEX GEOMETRY PATTERNS AND SCALING IN NATURE AND SOCIETY
(2023)
Article
Thermodynamics
Sajad Khodadadi, Mohammad Hassan Taleghani, Davood Domiri Ganji, Mofid Gorji-Bandpy
Summary: In this numerical study, the effect of bubble injection on the heat transfer rate next to an inclined heated wall is investigated. The solver used is the volume of fluid (VoF) method solver in the OpenFOAM package, extended with an energy equation and Boussinesq approximation to consider natural convection flow. The study explores the influence of parameters such as wall slope angle, contact angle, bubble pair, Bond number, and bubble regimes on the heat transfer rate. The results reveal the importance of wall slope and Bond number in determining the Nusselt number.
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
(2023)
Article
Materials Science, Multidisciplinary
Payam Jalili, Ali Ahmadi Azar, Bahram Jalili, Davood Domiri Ganji
Summary: This paper investigates the impact of thermo-diffusion, electrical field, and nonlinear thermal radiation. The analysis of radiation heat transfer in non-Newtonian fluids has significant industrial applications. The Hybrid Analytical and Numerical Method is utilized to examine the thermal nonlinear radiation heat transfer flow in non-Darcy Casson fluid on stretched surfaces.
RESULTS IN PHYSICS
(2023)
Article
Mathematics, Interdisciplinary Applications
Marcin B. Kaczmarek, Hassan HosseinNia
Summary: In this paper, a fractional-order extension of a negative position feedback (NPF) controller for active damping is proposed. The controller design is motivated by frequency-domain loop shaping analysis and maintains the high-pass characteristics of an integer-order NPF. Experimental results demonstrate the efficiency and feasibility of the proposed fractional-order controller.
FRACTAL AND FRACTIONAL
(2023)
Article
Thermodynamics
Mehran Ghasemian, M. Sheikholeslami, Maziar Dehghan
Summary: This study applies numerical techniques to assess the integration of twisted tapes in different cross-sectional tubes of Photovoltaic/Thermal (PV/T) collector units, and the impact on system performance. Computational fluid dynamics is used to evaluate PV/T systems with cylindrical, rectangular, and triangular cross-sectional tubes, with and without twisted tapes. Various pitch-to-width ratios (YD) of twisted tapes and total inlet mass flow rates are considered. The analysis of energy and exergy is carried out to evaluate system performance. The results show that the triangular cross-sectional tube is optimal without twisted tapes, but the cylindrical tube with twisted tapes outperforms other designs in terms of electrical and thermal aspects. The addition of a twisted tape in the cylindrical tube increases electrical efficiency by 7.2% and 9%, respectively. Furthermore, integrating twisted tapes with the lowest pitch-to-width ratio reduces surface temperature by 3.2℃ and 17.55℃ compared to systems with cylindrical tubes and PV alone.
Article
Construction & Building Technology
M. Sheikholeslami, Z. Khalili
Summary: A new configuration of photovoltaic-thermal unit with a thermoelectric layer has been proposed to enhance electrical performance. The system includes a circular duct with a turbulator and a mini channel with jet impingement for hybrid nanofluid flow. By selecting the turbulator with the highest revolution, the electrical efficiency improves by about 1.41% and useful heat increases by about 5.72%. The best case equipped with confined jets achieves an electrical performance of 15.50% and a thermal performance of 85.30%, with a temperature uniformity improvement of about 46.89%.
JOURNAL OF BUILDING ENGINEERING
(2023)
Article
Construction & Building Technology
M. Sheikholeslami, Hazim R. A. Al-Hussein
Summary: This study combines Trombe wall with paraffin layer and fins for solar energy saving and ventilation purposes. Alumina nanoparticles are loaded into pure paraffin to enhance the performance. Two heat generation terms are added to consider solar irradiation, and temperature equations with heat sources are applied for modeling different layers. The impacts of fins' thickness, length, and paraffin layer's position are investigated. The system with Y-shaped fins shows higher liquid fraction and lower heat loss, leading to a 28.41% increase in heat capacity at 17:00 with the best configuration.
JOURNAL OF BUILDING ENGINEERING
(2023)
Article
Green & Sustainable Science & Technology
Cameron Bracken, Nathalie Voisin, Casey D. Burleyson, Allison M. Campbell, Z. Jason Hou, Daniel Broman
Summary: This study presents a methodology and dataset for examining compound wind and solar energy droughts, as well as the first standardized benchmark of energy droughts across the Continental United States (CONUS) for a 2020 infrastructure. The results show that compound wind and solar droughts have distinct spatial and temporal patterns across the CONUS, and the characteristics of energy droughts are regional. The study also finds that compound high load events occur more often during compound wind and solar droughts than expected.
Article
Green & Sustainable Science & Technology
Ning Zhang, Yanghao Yu, Jiawei Wu, Ershun Du, Shuming Zhang, Jinyu Xiao
Summary: This paper provides insights into the optimal configuration of CSP plants with different penetrations of wind power by proposing an unconstrained optimization model. The results suggest that large solar multiples and TES are preferred in order to maximize profit, especially when combined with high penetrations of wind and photovoltaic plants. Additionally, the study demonstrates the economy and feasibility of installing electric heaters (EH) in CSP plants, which show a linear correlation with the penetration of variable energy resources.
Article
Green & Sustainable Science & Technology
M. Szubel, K. Papis-Fraczek, S. Podlasek
Article
Green & Sustainable Science & Technology
J. Silva, J. C. Goncalves, C. Rocha, J. Vilaca, L. M. Madeira
Summary: This study investigated the methanation of CO2 in biogas and compared two different methanation reactors. The results showed that the cooled reactor without CO2 separation achieved a CO2 conversion rate of 91.8%, while the adiabatic reactors achieved conversion rates of 59.6% and 67.2%, resulting in an overall conversion rate of 93.0%. Economic analysis revealed negative net present worth values, indicating the need for government monetary incentives.
Article
Green & Sustainable Science & Technology
Yang Liu, Yonglan Xi, Xiaomei Ye, Yingpeng Zhang, Chengcheng Wang, Zhaoyan Jia, Chunhui Cao, Ting Han, Jing Du, Xiangping Kong, Zhongbing Chen
Summary: This study investigated the effect of using nanofiber membrane composites containing Prussian blue-like compound nanoparticles (PNPs) to relieve ammonia nitrogen inhibition of rural organic household waste during high-solid anaerobic digestion and increase methane production. The results showed that adding NMCs with 15% PNPs can lower the concentrations of volatile fatty acids and ammonia nitrogen, and increase methane yield.
Article
Green & Sustainable Science & Technology
Zhong Ge, Xiaodong Wang, Jian Li, Jian Xu, Jianbin Xie, Zhiyong Xie, Ruiqu Ma
Summary: This study evaluates the thermodynamic, exergy, and economic performance of a double-stage organic flash cycle (DOFC) using ten eco-friendly hydrofluoroolefins. The influences of key parameters on performance are analyzed, and the advantages of DOFC over single-stage type are quantified.
Article
Green & Sustainable Science & Technology
Nicolas Kirchner-Bossi, Fernando Porte-Agel
Summary: This study investigates the optimization of power density in wind farms and its sensitivity to the available area size. A novel genetic algorithm (PDGA) is introduced to optimize power density and turbine layout. The results show that the PDGA-driven solutions significantly reduce the levelized cost of energy (LCOE) compared to the default layout, and exhibit a convex relationship between area and LCOE or power density.
Article
Green & Sustainable Science & Technology
Chunxiao Zhang, Dongdong Li, Lin Wang, Qingpo Yang, Yutao Guo, Wei Zhang, Chao Shen, Jihong Pu
Summary: In this study, a novel reversible liquid-filled energy-saving window that effectively regulates indoor solar radiation heat gain is proposed. Experimental results show that this window can effectively reduce indoor temperature during both summer and winter seasons, while having minimal impact on indoor illuminance.
Article
Green & Sustainable Science & Technology
Alessandro L. Aguiar, Martinho Marta-Almeida, Mauro Cirano, Janini Pereira, Leticia Cotrim da Cunha
Summary: This study analyzed the Brazilian Equatorial Shelf using a high-resolution ocean model and found significant tidal variations in the area. Several hypothetical barrages were proposed with higher annual power generation than existing barrages. The study also evaluated the installation effort of these barrages.
Article
Green & Sustainable Science & Technology
Francesco Superchi, Nathan Giovannini, Antonis Moustakis, George Pechlivanoglou, Alessandro Bianchini
Summary: This study focuses on the optimization of a hybrid power station on the Tilos island in Greece, aiming to increase energy export and revenue by optimizing energy fluxes. Different scenarios are proposed to examine the impact of different agreements with the grid operator on the optimal solution.
Article
Green & Sustainable Science & Technology
Peimaneh Shirazi, Amirmohammad Behzadi, Pouria Ahmadi, Sasan Sadrizadeh
Summary: This research presents two novel energy production/storage/usage systems to reduce energy consumption and environmental effects in buildings. A biomass-fired model and a solar-driven system integrated with photovoltaic thermal (PVT) panels and a heat pump were designed and assessed. The results indicate that the solar-based system has an acceptable energy cost and the PVT-based system with a heat pump is environmentally superior. The biomass-fired system shows excellent efficiency.
Article
Green & Sustainable Science & Technology
Zihao Qi, Yingling Cai, Yunxiang Cui
Summary: This study aims to investigate the operational characteristics of the solar-ground source heat pump system (SGSHPS) in Shanghai under different operation modes. It concludes that tandem operation mode 1 is the optimal mode for winter operation in terms of energy efficiency.
Article
Green & Sustainable Science & Technology
L. Bartolucci, S. Cordiner, A. Di Carlo, A. Gallifuoco, P. Mele, V. Mulone
Summary: Spent coffee grounds are a valuable biogenic waste that can be used as a source of biofuels and valuable chemicals through pyrolysis and solvent extraction processes. The study found that heavy organic bio-oil derived from coffee grounds can be used as a carbon-rich biofuel, while solvent extraction can extract xantines and p-benzoquinone, which are important chemicals for various industries. The results highlight the promising potential of solvent extraction in improving the economic viability of coffee grounds pyrolysis-based biorefineries.
Article
Green & Sustainable Science & Technology
Luiza de Queiroz Correa, Diego Bagnis, Pedro Rabelo Melo Franco, Esly Ferreira da Costa Junior, Andrea Oliveira Souza da Costa
Summary: Building-integrated photovoltaics, especially organic solar technology, are important for reducing greenhouse gas emissions in the building sector. This study analyzed the performance of organic panels laminated in glass in a vertical installation in Latin America. Results showed that glass lamination and vertical orientation preserved the panels' performance and led to higher energy generation in winter.
Article
Green & Sustainable Science & Technology
Zhipei Hu, Shuo Jiang, Zhigao Sun, Jun Li
Summary: This study proposes innovative fin arrangements to enhance the thermal performance of latent heat storage units. Through optimization of fin distribution and prediction of transient melting behaviors, it is found that fin structures significantly influence heat transfer characteristics and melting behaviors.