Article
Chemistry, Multidisciplinary
Andres Calcabrini, Paul Procel Moya, Ben Huang, Viswambher Kambhampati, Patrizio Manganiello, Mirco Muttillo, Miro Zeman, Olindo Isabella
Summary: This study analyzes how interdigitated back-contact solar cells with low-breakdown voltages can improve the shading tolerance of PV modules. Through simulations and monitoring activities, it is demonstrated that this new technology can significantly increase the annual energy yield of PV systems, particularly under partial shading conditions.
CELL REPORTS PHYSICAL SCIENCE
(2022)
Article
Thermodynamics
Abdelhak Keddouda, Razika Ihaddadene, Ali Boukhari, Abdelmalek Atia, Muesluem Arici, Nacer Lebbihiat, Nabila Ihaddadene
Summary: This study proposes artificial neural network (ANN) and regression models for predicting the power output of photovoltaic (PV) modules, considering the effects of climatic conditions and operating temperature. The models were trained using experimental data and selected attributes such as solar irradiation, temperature, wind speed, and humidity. The ANN model showed higher accuracy compared to linear regression models, while the Rational-PowerLaw (RPL) and Power-Law (PL) models captured the nonlinearity of the system and achieved excellent precision. The proposed models outperformed others in the literature, demonstrating superior performance and accuracy.
ENERGY CONVERSION AND MANAGEMENT
(2023)
Article
Environmental Sciences
Fan Yang, Wenzhou Yu, Jiale Wen, Weiyan Jiang, Nyarko-Appiah Joseph Emmanuel
Summary: In this study, an efficient and environmental friendly method for oxygen removal and silicon recovery from polycrystalline silicon kerf loss (PSKL) was proposed by combining vacuum magnesium thermal reduction and hydrochloric acid leaching. The effects of temperature, duration, and particle size on the reduction of PSKL were thoroughly investigated. The results showed that a high efficiency recovery of silicon from PSKL was achieved, with an oxygen removal fraction of 98.43% and a silicon recovery efficiency of 94.46%, under the optimal conditions. Compared to existing deoxidation technologies, this method requires a relatively lower temperature and allows for easy recovery of waste acid. The recycling of MgCl2 in the leaching liquor further enhances the environmental friendliness and commercial prospects of this process.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2023)
Article
Green & Sustainable Science & Technology
Mahdi Motamedi, Mehdi Rafeie, Ehsan Ebrahimnia Bajestan, Robert A. Taylor
Summary: This study investigates the impact of using nanofluids, super-hydrophobic walls, an anti-reflective coating, and a transparent selective surface on the thermal efficiency of a microchannel-based solar receiver. The study found that nanofluids have the biggest potential in reducing optical losses in direct absorption solar collectors.
Article
Energy & Fuels
Vallisree Sivathanu, R. Thangavel, Trupti Ranjan Lenka
Summary: The study analyzes a dual-junction CZTS-Si tandem solar cell structure and identifies current mismatch and photon losses as the main factors limiting efficiency. Through optimization of material parameters and structure design, the predicted efficiency of the tandem structure can be significantly improved to over 20%.
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
(2021)
Article
Optics
J. Dickmann, L. Shelling Neto, M. Gaedtke, S. Kroker
Summary: The frequency of ultra-stable lasers provides the most precise measurement in science, allowing for the detection of the smallest effects in nature. By optimizing the internal noise sources of the optical components, a design stability of 8 x 10-18 can be achieved for the laser.
Article
Energy & Fuels
Anh Huy Tuan Le, Rabin Basnet, Di Yan, Wenhao Chen, Naomi Nandakumar, Shubham Duttagupta, Johannes P. Seif, Ziv Hameiri
Summary: The temperature coefficient (TC) is crucial for evaluating solar cell performance, and TOPCon cells have shown promising results. This study investigates the temperature dependence of TOPCon cells and finds that the fill factor TC (TCFF) is superior to other cell structures. The observed improvement in passivation quality at higher temperatures has little impact on open-circuit voltage TC.
SOLAR ENERGY MATERIALS AND SOLAR CELLS
(2021)
Review
Thermodynamics
B. Kalidasan, Muhammed A. Hassan, A. K. Pandey, Subramaniyan Chinnasamy
Summary: Hollow cavity receivers are a new type of structure that overcomes the drawbacks of conventional evacuated tube receivers. They have advantages such as extended working temperature ranges, reduced thermal losses, and improved efficiency. Future research should focus on optimization and economic assessments to promote the diversified development of the solar receiver industry.
APPLIED THERMAL ENGINEERING
(2023)
Article
Green & Sustainable Science & Technology
Abdelaziz Zerglaine, Ahmed Mohammedi, Nasser Eddine Mebarki, Djamila Rekioua, Toufik Rekioua
Summary: The study aims to investigate the performance of a PV generator under different shading scenarios and compare the efficiency under various shading conditions. The results show that partial shading can significantly increase PV power gain, while random shading leads to a larger decrease in PV efficiency.
SUSTAINABLE ENERGY TECHNOLOGIES AND ASSESSMENTS
(2021)
Article
Chemistry, Physical
Simon M. F. Zhang, Johannes P. Seif, Malcolm D. Abbott, Anh Huy Tuan Le, Thomas G. Allen, Ivan Perez-Wurfl, Ziv Hameiri
Summary: This study investigates the temperature coefficients of different silicon solar cell technologies and explores the relationship between the temperature coefficient of short-circuit current, open-circuit voltage, and the illumination spectrum and intensity.
Article
Engineering, Electrical & Electronic
Jinhao Shen, Jian Zhang, Xiaoyan Huang, Lin Qiu, Youtong Fang
Summary: In output-parallel dual active-bridge (OP-DAB) converters, the thermal imbalance caused by asymmetrical phase-shift modulation (PSM) and mismatched parameters can lead to premature aging and failure. To suppress the thermal imbalance, an active thermal management method consisting of an improved PSM and a reliability-based power divider (PD) is proposed. By optimizing the modulation process and power distribution coefficient, the proposed method can balance the thermal distribution and increase the converter reliability without compromising electrical performance.
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2023)
Article
Thermodynamics
Hamdi Ayed, Hazim Moria, Fayez Aldawi, Naeim Farouk, Kamal Sharma, Mohammad Mehdizadeh Youshanlouei, Ibrahim Mahariq, Fahd Jarad
Summary: The investigation evaluated the thermal and power output of novel-shaped solar panels, with the conical shape exhibiting better performance than pyramid and hexagonal shapes. The corners of pyramid and hexagonal-shaped panels had higher temperatures. The efficiency of the conical shaped panel was up to 8.4% higher than that of the pyramid-shaped panel.
CASE STUDIES IN THERMAL ENGINEERING
(2021)
Article
Energy & Fuels
K. Ganesan, D. Prince Winston, Jeslin Drusila Nesamalar, M. Pravin
Summary: A bifacial solar photovoltaic module may have various faults that reduce its performance. Common faults include glass breakage, soiling, and delamination. Appropriate diagnostic techniques or design modifications are necessary to eliminate the negative effects of these faults. The proposed upside down installation method can enhance the output power.
Article
Green & Sustainable Science & Technology
Yang Liu, Huafei Du, Ziyuan Xu, Kangwen Sun, Mingyun Lv
Summary: This paper aims to maximize the output energy of the solar array by optimizing the configuration of insulation layers to ensure the normal operation of the stratospheric airship. The study finds that the output energy can be maximized while maintaining the differential pressure within a limited range by adjusting the insulation parameters.
Article
Energy & Fuels
Anh Huy Tuan Le, Julie Dreon, Jesus Ibarra Michel, Mathieu Boccard, James Bullock, Nino Borojevic, Ziv Hameiri
Summary: This study investigates the temperature-dependent performance of solar cells with TMO-based passivating contacts at different illumination intensities. It finds that the efficiency TC of MoOx and TiOx-based cells is similar and superior to standard SHJ cells, with MoOx cells benefiting from favorable TCJsc and TCFF, while TiOx cells benefiting solely from superior TCFF. The favorable TCJsc of MoOx cells is attributed to enhanced spectral response at short wavelengths due to improved passivation quality, and the beneficial TCFF of both cells is partly due to improved contact resistivity counterbalancing fill factor losses at elevated temperatures.
PROGRESS IN PHOTOVOLTAICS
(2022)
Article
Energy & Fuels
K. A. Kavadias, D. Apostolou, J. K. Kaldellis
Article
Green & Sustainable Science & Technology
K. Moustris, K. A. Kavadias, D. Zafirakis, J. K. Kaldellis
Article
Meteorology & Atmospheric Sciences
Harry D. Kambezidis, Basil E. Psiloglou, Dimitris G. Kaskaoutis, Dimitris Karagiannis, Kalliopi Petrinoli, Ariadne Gavriil, Kosmas Kavadias
THEORETICAL AND APPLIED CLIMATOLOGY
(2020)
Article
Green & Sustainable Science & Technology
Michael Darmanis, Murat Cakan, Konstantinos P. Moustris, Kosmas A. Kavadias, Konstantinos-Stefanos P. Nikas
Review
Energy & Fuels
Kosmas A. Kavadias, Panagiotis Triantafyllou
Summary: This study aims to categorize existing HRES simulation methods by reviewing modelling techniques and simulation software, analyzing widely used optimization targets, and evaluating the sensitivity of two commercial software tools through case studies. The results are compared with an ESA Microgrid Simulator to assess deviations detected in the selected software tools based on diversified renewable energy potential inputs.
Article
Energy & Fuels
Kosmas A. Kavadias, Vasileios Kosmas, Stefanos Tzelepis
Summary: Hydrogen has the potential to be a promising energy carrier, particularly for decarbonizing the economy and the transport sector. Fuel Cell Electric Vehicles (FCEVs) can reduce air pollution and greenhouse gas emissions when powered by hydrogen produced from renewable sources and accessed through a widespread network of refueling stations. This study analyzed the sizing and financial analysis of a hydrogen refueling station supplied with excess electrical energy from a 10 MW wind park. The results showed that a wind-powered refueling station can be a viable solution when sized appropriately.
Article
Energy & Fuels
Evangelos I. I. Sakellariou, Petros J. J. Axaopoulos, Bill Vaneck Bot, Kosmas A. A. Kavadias
Summary: This paper compares the energy performance of a forced circulation solar water heating system (FC) with a thermosyphon SHWS through an experiment. Identical systems were installed side by side at the University of West Attica in Athens, Greece, and received the same hot water load via a microcontroller-based dispensing unit. The results showed that both systems had similar solar fraction and thermal efficiency in similar weather conditions, but the FC system outperformed the thermosyphon system in a four-day continuous operation.
Article
Energy & Fuels
Stefanos Tzelepis, Kosmas A. Kavadias, George E. Marnellos
Summary: A three-dimensional steady-state model was used to study phenomena during PEMFC operation, with a focus on the composition and structure of the catalyst layers. Bimetallic catalyst layers consisting of Pt-Ru/C with a 50-50 ratio significantly improved the overall electrochemical performance of PEMFC.
Article
Construction & Building Technology
Evangelos I. Sakellariou, Petros J. Axaopoulos, Kosmas A. Kavadias, Antonios Nazos
Summary: In this study, the most prevalent space heating systems in Athens are assessed using a probabilistic economic method. The results show that the cost of all systems is higher than pre-crisis levels and not feasible in the current economic period. However, a solution to the volatility of the energy market can be achieved through energy cost subsidies and pairing heat pumps with PV systems.
JOURNAL OF BUILDING ENGINEERING
(2023)
Proceedings Paper
Green & Sustainable Science & Technology
Stefanos Tzelepis, Kosmas A. Kavadias
TECHNOLOGIES AND MATERIALS FOR RENEWABLE ENERGY, ENVIRONMENT AND SUSTAINABILITY: TMREES19GR
(2019)
Proceedings Paper
Green & Sustainable Science & Technology
Kosmas A. Kavadias, Panagiotis Alexopoulos, George Charis, John K. Kaldellis
TECHNOLOGIES AND MATERIALS FOR RENEWABLE ENERGY, ENVIRONMENT AND SUSTAINABILITY (TMREES)
(2019)
Proceedings Paper
Energy & Fuels
Georgios Tzanes, Effrosyni Zafeiraki, Christiana Papapostolou, Dimitrios Zafirakis, Moustris Konstantinos, Kosmas Kavadias, Konstantinos Chalvatzis, John K. Kaldellis
RENEWABLE ENERGY INTEGRATION WITH MINI/MICROGRID
(2019)
Proceedings Paper
Energy & Fuels
Kosmas A. Kavadias, Emily Karamanou
RENEWABLE ENERGY INTEGRATION WITH MINI/MICROGRID
(2019)
Proceedings Paper
Energy & Fuels
Kosmas A. Kavadias, Panagiotis Alexopoulos, George Charis
RENEWABLE ENERGY INTEGRATION WITH MINI/MICROGRID
(2019)
Proceedings Paper
Energy & Fuels
K. A. Kavadias, D. Zafirakis, A. G. Paliatsos
8TH INTERNATIONAL CONFERENCE ON APPLIED ENERGY (ICAE2016)
(2017)
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.
