Article
Environmental Sciences
Sonia Z. Issaq, Shamil K. Talal, Aasim A. Azooz
Summary: A new model has been developed to determine the optimal tilt angle for PV panels and solar collectors based on yearly, seasonal, and monthly basis. The model estimates the diffusion component of solar radiation using Orgill and Holland's model, and the relationship between diffusion and direct components is derived from empirical data. The optimal tilt angle for each month, season, and year is determined by maximizing the total amount of diffused and direct radiation. The model is programmed in MATLAB and is consistent with experimental data and other published model predictions.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2023)
Article
Energy & Fuels
Yusuf N. Chanchangi, Aritra Ghosh, Senthilarasu Sundaram, Tapas K. Mallick
Summary: The study found that the reduction in transmittance was most significant on horizontally positioned solar panels, with the least reduction on panels exposed vertically. Dust accumulation was highest on horizontally positioned panels and decreased gradually as the angle tilted towards vertical. This research highlights the importance of monitoring and predicting soiling events to optimize maintenance and restore PV performance.
Article
Energy & Fuels
Naveed Hussain, Nadia Shahzad, Tanzeela Yousaf, Adeel Waqas, Ahad Hussain Javed, Sheheryar Khan, Majid Ali, Rabia Liaquat
Summary: The study emphasizes the importance of indoor soiling station to simulate daily outdoor soil cycles for investigating the effects of pollution on Photovoltaic modules under controlled conditions. The uniformity of soiling in the chamber was confirmed using Scanning Electron Microscopy and ultraviolet-visible spectroscopy.
Article
Environmental Sciences
Hussein A. Kazem, Miqdam T. Chaichan, Ali H. A. Al-Waeli
Summary: This study compares the performance degradation of monocrystalline and polycrystalline photovoltaic modules due to dust accumulation and tests different cleaning methods. The results show that monocrystalline modules experience higher power degradation, but the dust accumulation rate in the study area is relatively low compared to other Gulf countries.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(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)
Review
Green & Sustainable Science & Technology
B. Laarabi, Y. El Baqqal, N. Rajasekar, A. Barhdadi
Summary: Solar energy can be easily converted to electricity using different technologies, but conversion efficiency is affected by factors such as soiling phenomenon caused by accumulation of dust and contaminants. This phenomenon, especially for photovoltaic modules, is the focus of the research, including methods of quantification and factors influencing soiling. The study also discusses mitigation methods and provides a summary of key contributions from Morocco and India.
JOURNAL OF CLEANER PRODUCTION
(2021)
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
Energy & Fuels
Hussein A. Kazem, Miqdam T. Chaichan, Ali H. A. Al-Waeli, K. Sopian
Summary: In this study, the impact of dust accumulation on photovoltaic modules was investigated, and the effectiveness of different cleaning methods was evaluated. The results showed that dust accumulation significantly decreased the power output, with polycrystalline modules being more affected than monocrystalline modules. The study recommended the use of a sodium solution with rubber and cloth brushes for optimal cleaning.
Article
Green & Sustainable Science & Technology
Khaled S. Alzahrani
Summary: This study examines the effects of dust, sand grains, and soiling on the efficiency of PV modules in industrial cities and arid coastal regions. The results show that PV modules with higher solar radiation absorption have lower resistance to soiling. Clean modules perform better than soiled modules. Additionally, modules installed at a greater tilt angle of 24 degrees have lower power losses.
Article
Green & Sustainable Science & Technology
N. Simal Perez, J. Alonso-Montesinos
Summary: This study developed a geographical map for selecting optimal sites for photovoltaic plants in the Iberian Peninsula and the Balearic Islands (Spain), considering factors such as photovoltaic potential, terrain orography, and losses caused by dust deposition. Economic profitability maps and amortization times were also developed, with the worst case scenario indicating that the installation can be amortized within 9 years with a total economic benefit of 806 Meuro. Additionally, the study calculated the annual savings in terms of CO2 emissions, resulting in a total saving of 3000 M metric tonnes of CO2.
JOURNAL OF CLEANER PRODUCTION
(2023)
Article
Construction & Building Technology
Seyfi Sevik, Abdulkadir Kocer, Huseyin Ince, Fazli Engin Tombus
Summary: This study aims to determine the optimal tilt angle for solar collectors or PVs in the province of Corum, Turkey, and evaluates the solar potential of existing building stocks. Adjusting tilt angles and positioning buildings properly can significantly increase efficiency and contribute to decarbonization.
ARCHITECTURAL ENGINEERING AND DESIGN MANAGEMENT
(2022)
Article
Green & Sustainable Science & Technology
Bouchra Laarabi, Srinivasa Sankarkumar, Natarajan Rajasekar, Youssef El Baqqal, Abdelfettah Barhdadi
Summary: This research focuses on the impact of pollution on solar energy systems, specifically the influence of dust on the transmittance of glass samples in Tamil Nadu, India. A comparative analysis is also conducted between this study and a previous one conducted in Morocco. The study concludes that pollution is a complex phenomenon affected by various variables such as location, time, and measurements.
SUSTAINABLE ENERGY TECHNOLOGIES AND ASSESSMENTS
(2022)
Review
Computer Science, Information Systems
Muhannad J. Alshareef
Summary: This paper provides a comprehensive review of the impact of dust on Photovoltaic (PV) systems and effective cleaning methods. It analyzes previous research and model development, highlighting the negative effects of dust accumulation on PV system efficiency and identifying research gaps for further exploration.
Review
Energy & Fuels
A. Younis, Y. Alhorr
Summary: This article summarizes the research of scientists on the factors influencing the performance of solar panels, including the analysis of the impact of dust accumulation on the surface of solar panels using methods such as numerical simulation and modeling.
Article
Thermodynamics
Prasanth K. Enaganti, Ankur Bhattacharjee, Aritra Ghosh, Yusuf N. Chanchangi, Chanchal Chakraborty, Tapas K. Mallick, Sanket Goel
Summary: The study shows that natural dust accumulation significantly reduces energy generation from PV modules.
Article
Green & Sustainable Science & Technology
Francis M. Lopes, Ricardo Conceicao, Thomas Fasquelle, Hugo G. Silva, Rui Salgado, Paulo Canhoto, Manuel Collares-Pereira
Article
Green & Sustainable Science & Technology
Telma Lopes, Thomas Fasquelle, Hugo G. Silva
Summary: Direct circulation of molten salts in the solar field of parabolic trough solar power plants could be a breakthrough in reducing the levelized cost of electricity. By using molten salts instead of thermal oils, lower pressure drops, reduced electricity consumption, and simpler power block designs can be achieved, ultimately leading to cost savings and increased efficiency.
Article
Green & Sustainable Science & Technology
Ahmed Alami Merrouni, Ricardo Conceicao, Ammar Mouaky, Hugo Goncalves Silva, Abdellatif Ghennioui
Article
Green & Sustainable Science & Technology
Francis M. Lopes, Ricardo Conceicao, Hugo G. Silva, Rui Salgado, Manuel Collares-Pereira
Summary: This study enhances operational strategies of concentrating solar power plants by utilizing post-processing methods on numerical weather predictions to improve the accuracy of electricity forecasts. By using short-term forecasts from the Integrated Forecasting System and measurements in southern Portugal, the research significantly increases the prediction accuracy in hourly forecasts.
Article
Environmental Sciences
Francis M. Lopes, Emanuel Dutra, Isabel F. Trigo
Summary: In this study, a new machine learning algorithm using multivariate adaptive regression splines (MARS) and the combination of near-surface meteorological data with satellite cloud information is proposed for the estimation of downward long-wave radiation (DLR) at the surface. The algorithm is compared with the current operational formulation and shows improvement in DLR estimation, especially when trained with observations.
Article
Energy & Fuels
Ana Foles, Luis Fialho, Manuel Collares-Pereira, Pedro Horta
Summary: This study focuses on using VRFB to control the power output of PV installation and investigates energy key-performance indicators. Real-time validation results show the importance of applying these energy management strategies on VRFB to control power fluctuations. SCM+RR+WF is a robust approach for managing PV+VRFB systems, feasible in wintertime and high PV penetration building areas.
SUSTAINABLE ENERGY GRIDS & NETWORKS
(2022)
Article
Energy & Fuels
Ailton M. Tavares, Ricardo Conceicao, Francisco M. Lopes, Hugo G. Silva
Summary: Evaluation of the Concentrating Solar Power capacity factor is critical for regional energy investments. The Engerer model is used to estimate direct normal irradiance values for different locations, which helps in identifying suitable sites for Concentrating Solar Power systems. This study supports energy policies in promoting Concentrating Solar Power investments in specific regions of Portugal.
Article
Meteorology & Atmospheric Sciences
J. Bor, T. Bozoki, G. Satori, E. Williams, S. A. Behnke, M. J. Rycroft, A. Buzas, H. G. Silva, M. Kubicki, R. Said, C. Vagasky, P. Steinbach, K. Szabone Andre, M. Atkinson
Summary: This study discusses the responses of the AC and DC global electric circuits to the eruption of the Hunga Tonga-Hunga Ha'apai volcano on January 15, 2022. The AC investigation is based on Schumann resonance (SR) measurements, while the DC investigation utilizes atmospheric electric field measurements. The results show that the eruption enhanced lightning activity, leading to a global intensification of SR. It also suggests that the eruption caused impulse-like charging of the DC global electric circuit through negative cloud-to-ground lightning strokes.
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES
(2023)
Article
Computer Science, Cybernetics
Ana B. Cristobal, Cristina Sanz-Cuadrado, Zhe Zhang, Marta Victoria, Luis Fialho, Afonso Cavaco, Matevz Bokalic, Luis Narvarte
Summary: This paper explores the operationalization of energy communities as a tool to create large and stable citizen science and education hubs focused on energy. It presents the rationale behind energy communities and their potential for transformative change. The developed model has received positive feedback from European university communities, showing its acceptability and potential for inclusiveness and universal access to energy experiences.
UNIVERSAL ACCESS IN THE INFORMATION SOCIETY
(2023)
Article
Energy & Fuels
Ana Belen Cristobal, Luis Narvarte, Marta Victoria, Luis Fialho, Zhe Zhang, Cristina Sanz-Cuadrado, Matevz Bokalic
Summary: Universities can play a significant role in energy education and transition by establishing energy communities through collaboration with communities, providing sustainable education and practical experiences.
Article
Multidisciplinary Sciences
Humberto Queiroz, Rui Amaral Lopes, Joao Martins, Filipe Neves Silva, Luis Fialho, Nuno Bilo
Summary: The recent European legal framework allows buildings to function as energy communities, increasing the use of locally generated renewable energy through sharing coefficients. This study analyzed the energy sharing coefficients proposed by Portuguese legislation and found that time-variable coefficients are the best option for renewable energy communities. It also highlighted that larger consumers benefit more from integration into these communities.
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.
