Article
Energy & Fuels
Monica Chinchilla, David Santos-Martin, Miguel Carpintero-Renteria, Scott Lemon
Summary: This study proposes models for accurately calculating the optimal tilt angle for solar photovoltaic arrays or solar collectors worldwide, using global horizontal radiation data. A mathematical model based on latitude has been developed. The results demonstrate the good performance of the proposed models.
Article
Green & Sustainable Science & Technology
Nicholas Mukisa, Ramon Zamora
Summary: The study investigated the optimal tilt angle for pitched rooftops in the low latitude equatorial region of Uganda, using a replicable methodology. Results showed that the annual optimal tilt angle and average monthly optimal angle vary within specific ranges, with adjustments in the support structure needed for installation.
SUSTAINABLE ENERGY TECHNOLOGIES AND ASSESSMENTS
(2022)
Article
Energy & Fuels
Raghed Melhem, Yomna Shaker
Summary: This article focuses on optimizing the tilt angle of solar panels in the GCC countries. By using a mathematical model and comparing it with the PVWatts calculator, the study calculates the optimal tilt angle based on latitude and longitude. The importance of choosing the right tilt angle for maximizing solar energy production is emphasized. The results show that changing the tilt angle 12 times a year can increase power output by 10.9%. The study highlights the importance of selecting the optimal tilt angle and provides valuable data for the GCC countries.
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
(2023)
Article
Green & Sustainable Science & Technology
Samuele Memme, Marco Fossa
Summary: This paper addresses the problem of determining the yearly maximum energy producibility in terms of optimum tilt angle for solar surfaces in 216 locations in France and Italy. Original correlations are proposed to calculate the optimal surface slope as a correction parameter. The formulas for the correction factor are based on local climate conditions and inferred from local monthly insolation data. An optimization problem is solved to maximize the yearly collectable energy by a sloped surface, considering different azimuth values. The proposed formulas provide accurate results and can lead to a 4% increase in solar energy collection.
Article
Computer Science, Interdisciplinary Applications
Faranak Gholampour, Esmail Hesameddini, Ameneh Taleei
Summary: This paper introduces an efficient global meshless method for solving elliptic problems with arbitrary interface, using RBF-QR collocation technique. The method is applied to two-dimensional elliptic interface problems, including Poisson, Helmholtz, and elasticity problems, and is shown to be effective and stable for complex interface geometries and discontinuous variable coefficients, even for small values of epsilon.
ENGINEERING WITH COMPUTERS
(2021)
Article
Green & Sustainable Science & Technology
Manoj Kumar Sharma, Jishnu Bhattacharya
Summary: This study investigates the deviation of actual power output of a photovoltaic panel from the rated value, which is caused by three major factors: irradiance, temperature, and spectral factor. While the first two factors are well understood, the spectral factor, which depends on spectral irradiance and material response, has received less attention. The study demonstrates that the angle of incidence (AOI) has a strong impact on the spectral factor, and the conventional methods that assume normal irradiance underestimate the spectral factor. The study also reveals significant underestimation of the modified definition for a specific location, suggesting that this underestimation may be even higher in locations with higher latitude.
Article
Energy & Fuels
Loiy Al-Ghussain, Onur Taylan, Mohammad Abujubbeh, Muhammed A. Hassan
Summary: To address the increasing installation capacities of solar PV systems in desert areas, this study examines the impacts of ambient temperature, wind speed, dust accumulation, and cleaning frequency on energy production and optimal angles of PV panels. Results show higher energy production estimates using an isotropic model, and the cooling effect of wind speed reduces the operating temperature of thin-film panels. Cleaning the panels bi-monthly decreases annual energy production, and doubling the dust accumulation rate decreases energy production for all cases. The optimal tilt and azimuth angles vary within -3.0 degrees with dust accumulation rate.
Review
Thermodynamics
Javier Almorox, Cyril Voyant, Nadjem Bailek, Alban Kuriqi, J. A. Arnaldo
Summary: This study reviewed Total Solar Irradiance (TSI) and Solar Constant (SC), reevaluated them, and developed new seasonal radiation coefficient sets. It recommended using a TSI value of 1361 W m(-2) in solar radiation models for accuracy, highlighting the importance of local and seasonal calibration coefficients.
Article
Computer Science, Interdisciplinary Applications
Nat H. Mathews, Natasha Flyer, Sarah E. Gibson
Summary: The study presents a novel magnetohydrostatic numerical model for directly solving the force-balanced magnetic field in the solar corona. The model utilizes Radial Basis Function Finite Differences with 3D polyharmonic splines plus polynomials as the core discretization. It addresses the challenges posed by the ill-posed and numerically intractable nature of the static force-balance equations in the limit of zero forcing.
JOURNAL OF COMPUTATIONAL PHYSICS
(2022)
Article
Thermodynamics
Jiaxuan Jing, Yong Zhou, Lingyu Wang, Yanfeng Liu, Dengjia Wang
Summary: This study aims to fill the gaps in global solar radiation data by using limited data from 85 meteorological observation stations and routine meteorological data from 2001 stations. The spatial distribution of global solar radiation and diffuse solar radiation is obtained using the Inverse Distance Weighing model. The optimum tilt angle of photovoltaic systems is calculated using the Collares-Pereira and Rabl hourly solar radiation model and the solar radiation on sloped surfaces model. The results show the range of annual global solar radiation and diffuse solar radiation in China, as well as the optimal tilt angle and photovoltaic power generation potential.
ENERGY CONVERSION AND MANAGEMENT
(2023)
Article
Green & Sustainable Science & Technology
Olle Michel Kam, Stephane Noel, Harry Ramenah, Pierre Kasser, Camel Tanougast
Summary: This paper investigates the use of Weibull distribution analysis for accurate global solar irradiance assessment aimed at providing precise estimation of PV energy output. By comparing different methods and databases, the study identifies the most suitable method and model, leading to a more accurate tool for solar energy forecasting.
Article
Green & Sustainable Science & Technology
Maryon Eliza Matius, Mohd Azlan Ismail, Yan Yan Farm, Adriana Erica Amaludin, Mohd Adzrie Radzali, Ahmad Fazlizan, Wan Khairul Muzammil
Summary: The study aims to estimate the optimal tilt angle and orientation for solar PV modules using several isotropic models, with the Tian model showing the closest approximation to the data provided by GSA 2.3. However, all isotropic models demonstrated an error of around 30% compared to GSA 2.3.
Article
Chemistry, Multidisciplinary
Xavier Serrano-Guerrero, Eduardo Cantos, Juan-Javier Feijoo, Antonio Barragan-Escandon, Jean-Michel Clairand
Summary: This study proposes a computer application based on existing mathematical models and meteorological data to determine the optimal tilt and orientation angles for maximizing solar insolation capture in the main cities of Ecuador. The results show that flat solar capture surfaces in Ecuador can be oriented between 20 and 60 degrees north, with tilt angles between 12 and 19 degrees, contrasting with conventional recommendations.
APPLIED SCIENCES-BASEL
(2021)
Article
Energy & Fuels
Rahul Chandel, Shyam Singh Chandel
Summary: This study analyzed the performance of a 19 MWp PV plant in India with fixed-tilt, seasonal adjustable-tilt, and horizontal single-axis solar tracking configurations, providing a comparative power enhancement analysis. The study found that the single-axis solar tracking configuration had higher annual performance ratio and capacity factors, leading to significantly improved energy yield compared to fixed-tilt and seasonal adjustable-tilt configurations.
PROGRESS IN PHOTOVOLTAICS
(2022)
Article
Computer Science, Interdisciplinary Applications
Jonah A. Reeger
Summary: This article describes a method for evaluating definite integrals over bounded volumes with smooth boundaries in three dimensions using a Radial Basis Function Generated Finite-Differences (RBF-FD) inspired technique. This approach allows the user to approximate the integral value without knowing the expression for the boundary surface. The method utilizes a tesselation of the node set to determine the domain geometry and can handle node sets with spatially varying density. The algorithm computes quadrature weights for N arbitrarily scattered nodes with tunable orders of accuracy in only O(N log N) operations.
JOURNAL OF COMPUTATIONAL PHYSICS
(2023)
Review
Engineering, Multidisciplinary
C. D. Argyropoulos, N. C. Markatos
APPLIED MATHEMATICAL MODELLING
(2015)
Article
Mechanics
D. P. Karadimou, N. C. Markatos
JOURNAL OF TURBULENCE
(2016)
Article
Chemistry, Physical
I. C. Tolias, A. G. Venetsanos, N. Markatos, C. T. Kiranoudis
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2017)
Article
Engineering, Environmental
C. D. Argyropoulos, A. M. Ashraf, N. C. Markatos, K. E. Kakosimos
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
(2017)
Article
Chemistry, Multidisciplinary
Charalampos Themistokleous, Nikolaos-Grigorios Markatos, John Prospathopoulos, Vasilis Riziotis, Giorgos Sieros, George Papadakis
Summary: This study optimized the morphed shapes of a NACA 64A010 airfoil using morphing technology, which can significantly improve lift characteristics, with a potential increase of around 100% by combining leading and trailing edge morphing. Among the various optimization algorithms tested, the Particle Swarm Optimizer performed the best, producing maximum lift increase designs with the lowest computational cost.
APPLIED SCIENCES-BASEL
(2021)
Article
Engineering, Chemical
G. Momferatos, S. G. Giannissi, I. C. Tolias, A. G. Venetsanos, A. Vlyssides, N. Markatos
Summary: In this study, three different types of vapor cloud explosion experiments were simulated to evaluate a newly developed CFD model and analyze the involved phenomena. The CFD model, implemented in the ADREA-HF CFD code, successfully predicted the overpressure values and discussed the factors contributing to the pressure rise in each experiment.
JOURNAL OF LOSS PREVENTION IN THE PROCESS INDUSTRIES
(2022)
Proceedings Paper
Mathematics, Interdisciplinary Applications
S. G. Giannissi, A. G. Venetsanos, N. Markatos
4TH INTERNATIONAL CONFERENCE ON MATHEMATICAL MODELING IN PHYSICAL SCIENCES (IC-MSQUARE2015)
(2015)
Article
Multidisciplinary Sciences
D. P. Karadimou, P. A. Papadopoulos, N. C. Markatos
JOURNAL OF KING SAUD UNIVERSITY SCIENCE
(2019)
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.