Article
Thermodynamics
Ali Gholami, Mofid Gorji
Summary: This study used sodium sulfate decahydrate (Na2SO4.10H2O) with different masses as a phase change material (PCM). The use of rigid blades and heated sinks improved thermal conductivity. Results showed that fixed blades and heatsinks had a positive effect on temperature parameters and panel efficiency. The panel with phase change material and fixed blades maintained the same temperature as the standard panel even after the test, with a temperature difference of 11.5 degrees C. The maximum efficiency difference between the panel with phase change material and a conventional panel was 3.05% and 6.17%, respectively.
CASE STUDIES IN THERMAL ENGINEERING
(2023)
Article
Energy & Fuels
Zhanpeng Wei, Yiheng Shi, Qing Li, Qiang Niu, Yu Hou, Shuang Yang
Summary: This study develops an analytical model to understand the temperature sensitivity of perovskite solar cells (PSCs). By considering the temperature-dependent bandgap and band edge, the model quantitively describes the impact of various physical factors on photovoltaic performance. It was found that the built-in electrical field and minority carrier concentration at interface are closely related to temperature, which affect the temperature sensitivity of the device.
Article
Energy & Fuels
Ali M. Eltamaly
Summary: Solar photovoltaic energy systems are an attractive source of energy, and accurate modeling of PV cells is crucial for sizing and cost estimation. This paper introduces a new optimization algorithm, the musical chairs algorithm (MCA), which can quickly and accurately estimate the parameters of PV cells. Results show that MCA outperforms other optimization algorithms in terms of accuracy and time efficiency.
Article
Physics, Applied
Emily S. S. Kessler-Lewis, Stephen J. J. Polly, George T. T. Nelson, Michael A. A. Slocum, Nikhil Pokharel, Phil Ahrenkiel, Seth M. M. Hubbard
Summary: GaSb grown on GaAs through interfacial misfit (IMF) arrays via molecular beam epitaxy has been extensively studied, but research on IMF growth through metal-organic vapor phase epitaxy (MOVPE) is limited. To demonstrate viability for integration in terrestrial multijunction solar cells, high quality GaSb grown on GaAs through MOVPE is crucial. The preferred gallium precursors for n-type and p-type GaSb were determined to be trimethylgallium and triethylgallium, respectively. A heteroepitaxial GaSb-on-GaAs device achieved an open-circuit voltage of 190 mV and an efficiency of 2.2%. The threading dislocation density of the heteroepitaxial GaSb-on-GaAs device was determined to be 7.5 x 10( 6) cm( - 2) based on minority carrier lifetime. In a modeled multijunction solar cell, this device contributed to an overall efficiency of 33.1% under AM1.5g illumination.
JOURNAL OF APPLIED PHYSICS
(2023)
Review
Nanoscience & Nanotechnology
Chunlei Sun, Yuan Zou, Caiyan Qin, Bin Zhang, Xiaohu Wu
Summary: This review examines previous studies on the temperature effect in solar cells (SCs) and discusses its impact on SC performance. It introduces various methods to deal with the temperature effect of SCs and analyzes other factors that affect SC performance.
ADVANCED COMPOSITES AND HYBRID MATERIALS
(2022)
Article
Engineering, Multidisciplinary
Waleed Abd El Maguid Ahmed, Hala M. Abdel Mageed, Samah AbdEltwab Mohamed, Amr A. Saleh
Summary: Improved Fractional Order Darwinian Particle Swarm Optimization (FODPSO) is proposed to identify parameters of solar PV cells and modules. Comparative studies show that FODPSO outperforms traditional PSO algorithm in modeling PV units.
ALEXANDRIA ENGINEERING JOURNAL
(2022)
Article
Green & Sustainable Science & Technology
M. Piliougine, R. A. Guejia-Burbano, G. Petrone, F. J. Sanchez-Pacheco, L. Mora-Lopez, M. Sidrach-de-Cardona
Summary: This paper analyzes a selection of explicit methods to test their capability to detect degradation in photovoltaic modules. The study shows that only few methods exhibit enough reliability to estimate correctly the model parameters in the presence of degradation.
Article
Thermodynamics
Fatima Belabbes, Daniel T. Cotfas, Petru A. Cotfas, Mourad Medles
Summary: The accurate extraction of photovoltaic cells and panels parameters is crucial for energy forecasting and power point identification. This paper proposes the usage of the Snake optimization algorithms to extract parameters of three types of photovoltaic cells. The Snake algorithm outperforms several others, and an improved version is developed with better results. The improved snake algorithm reduces computational time and is one of the best algorithms for parameter extraction.
ENERGY CONVERSION AND MANAGEMENT
(2023)
Article
Physics, Multidisciplinary
D. Sahoo, N. B. Manik
Summary: Perovskite is a promising material for thin-film solar cells, but tin-based perovskite solar cells have issues with thermal instability and poor performance. This study investigates the temperature effects on the electrical and photovoltaic parameters of lead-free tin-based perovskite solar cells using simulation analysis.
INDIAN JOURNAL OF PHYSICS
(2023)
Article
Energy & Fuels
Majid Ahmed Mohammed, Bashar Mahmood Ali, Khalil Farhan Yassin, Obed Majeed Ali, Omar Rafae Alomar
Summary: This study compares the effects of different phase change materials on the performance of solar panels. The experiment shows that the use of beeswax can lower the temperature of the panel and increase the efficiency of the photovoltaic system.
Article
Computer Science, Information Systems
Subhash Chandra, Arvind Yadav, Mohd Abdul Rahim Khan, Mukesh Pushkarna, Mohit Bajaj, Naveen Kumar Sharma
Summary: This study focuses on the performance of PV modules under different environmental conditions, particularly the impact of natural cooling. The research shows that considering the natural cooling effect can lead to improvements in various performance parameters.
Article
Chemistry, Physical
Yunpeng Qin, Nrup Balar, Zhengxing Peng, Abay Gadisa, Indunil Angunawela, Anirban Bagui, Somayeh Kashani, Jianhui Hou, Harald Ade
Summary: Organic photovoltaic technology has achieved high power conversion efficiency, but achieving long-term stability is crucial. Research has identified a structure-T-g framework for BTP acceptors and shown that PC71BM can improve stability under certain conditions.
Article
Mathematics
Manoharan Madhiarasan, Daniel T. Cotfas, Petru A. Cotfas
Summary: The black widow optimization algorithm (BWOA) is proposed for the first time to identify the parameters of photovoltaic (PV) cells and panels. The BWOA shows good performance in most cases and has a relatively short computation time.
Article
Engineering, Electrical & Electronic
Papul Changmai, Shashank Kumar, Sisir Kumar Nayak, Sanjeev Kumar Metya
Summary: This article proposes a total cross tied (TCT) connection method to address the performance degradation of solar photovoltaic (PV) modules under partial shading conditions. It presents a simple and robust analytical algorithm to estimate the output power of TCT connected modules. The algorithm shows low error and significant performance improvement in practical applications.
IEEE JOURNAL OF EMERGING AND SELECTED TOPICS IN POWER ELECTRONICS
(2022)
Article
Chemistry, Physical
Memoona Khan, Faiza Jilani, Amna Ayub, Zubera Naseem, Ali Raza Ayub, Muhammad Shabir Mahr, Javed Iqbal
Summary: A theoretical analysis of the photovoltaic properties of nonfullerene organic solar cells was conducted by designing four molecules with different donor units around the central acceptor core through thiophene spacer. Among these molecules, M4 exhibited the highest bathochromic shift, lower electron and hole mobility, higher charge transfer capabilities, lower reorganization energy, and a higher open circuit voltage compared to the other designed molecules. The designed Acceptor-pi spacer-Donor molecule was found to open a new pathway for solar cell materials with modified and advanced properties.
INTERNATIONAL JOURNAL OF QUANTUM CHEMISTRY
(2021)
Article
Chemistry, Physical
Petru A. Cotfas, Daniel T. Cotfas
Summary: Solar energy is increasingly used as a renewable energy source, and improving the efficiency of energy conversion is a key research direction. Hybrid systems for cogeneration can be a solution, where the exposed surface affects the efficiency of each component. Increasing the concentration ratio can lead to different effects on the system components.
INTERNATIONAL JOURNAL OF PHOTOENERGY
(2021)
Article
Green & Sustainable Science & Technology
Daniel T. Cotfas, Adrian M. Deaconu, Petru A. Cotfas
Summary: A new hybrid successive discretisation algorithm is introduced for calculating parameters of photovoltaic cells and panels, showing improved accuracy and reliability compared to current best algorithms in specialized literature.
IET RENEWABLE POWER GENERATION
(2021)
Article
Thermodynamics
S. Mahmoudinezhad, D. T. Cotfas, P. A. Cotfas, Enok J. H. Skjolstrup, K. Pedersen, L. Rosendahl, A. Rezania
Summary: The study demonstrates significant impact of spectrum splitting technique on a hybrid PV-TEG system, enhancing power generation of PV cell and overall power generation.
Article
Computer Science, Information Systems
Octavian Machidon, Jani Asprov, Tine Fajfar, Veljko Pejovic
Summary: This study investigates how a user's physical activity, the spatial/temporal properties of the video, and the user's personality traits interact and jointly influence the minimal acceptable playback resolution. The findings show that the minimal acceptable resolution varies across different contextual factors. The predictive models and power consumption measurements suggest an opportunity for energy saving through context-adaptable approximate computing.
MULTIMEDIA TOOLS AND APPLICATIONS
(2023)
Article
Chemistry, Analytical
Manoharan Madhiarasan, Daniel T. Cotfas, Petru A. Cotfas
Summary: The goal of this research is to accurately extract the parameters of photovoltaic cells and panels and reduce the extraction time. For this purpose, the barnacles mating optimizer algorithm is proposed and its accuracy and quickness are proven by comparing it with other methods and algorithms. This algorithm outperforms several algorithms and reduces the computational time significantly.
Article
Green & Sustainable Science & Technology
Abdelkader Rjafallah, Daniel Tudor Cotfas, Petru Adrian Cotfas
Summary: The performance of thermoelectric modules is influenced by the geometry of the legs, module area, and number of pairs. This study compares the performance of different thermoelectric modules based on shape and dimensions. Simulation results show that thermoelectric modules with filled square legs perform the best.
Article
Chemistry, Multidisciplinary
Florin Radu, Petru A. Cotfas, Marian Alexandru, Titus C. Balan, Vlad Popescu, Daniel T. Cotfas
Summary: In this paper, the implementation of a system for identifying the modulation of complex radio signals is presented. An artificial intelligence model developed and integrated with Microsoft Azure cloud is used. Cloud-based platforms are considered as an alternative to conventional computers for signal processing based on artificial intelligence due to their flexibility and processing power. The system is tested using a software-defined radio platform developed in GNU Radio to ensure its viability in real signal processing systems. The results show successful identification of certain modulation types, and the use of a cloud-based platform allows quick access to the system using just a laptop with internet access.
APPLIED SCIENCES-BASEL
(2023)
Editorial Material
Mathematics
Adrian Marius Deaconu, Daniel Tudor Cotfas, Petru Adrian Cotfas
Article
Mathematics
Manoharan Madhiarasan, Daniel T. Cotfas, Petru A. Cotfas
Summary: The black widow optimization algorithm (BWOA) is proposed for the first time to identify the parameters of photovoltaic (PV) cells and panels. The BWOA shows good performance in most cases and has a relatively short computation time.
