A5076732045- Innovative Energy Harvesting Technologies
- Advanced Sensor and Energy Harvesting Materials
- Dielectric materials and actuators
- Advanced Thermoelectric Materials and Devices
- Thermal Radiation and Cooling Technologies
- Solar Thermal and Photovoltaic Systems
- Ferroelectric and Piezoelectric Materials
- Photovoltaic Systems and Sustainability
- Energy Harvesting in Wireless Networks
- Natural Fiber Reinforced Composites
- Nanocomposite Films for Food Packaging
- Engineering Applied Research
- Heat Transfer and Optimization
- Thermal properties of materials
- Wireless Power Transfer Systems
- Photovoltaic System Optimization Techniques
- Solar Radiation and Photovoltaics
- Solar-Powered Water Purification Methods
- biodegradable polymer synthesis and properties
- Acoustic Wave Resonator Technologies
Transylvania University of Brașov
2022-2024
Chouaib Doukkali University
2017-2024
École Marocaine des Sciences de l'Ingénieur
2022
This study investigated the impact of dust samples from Romania on small-scale silicon-based photovoltaic (PV) devices through field and laboratory experiments. Nonhomogeneous layers natural were intentionally applied to surfaces three crystalline amorphous silicon mini units, with film depth measured using an ultrasonic coating thickness gauge. Indoor testing employed a Xenon solar simulator. Key findings reveal significant deterioration in PV electrical characteristics, maximum losses...
In the contemporary quest for sustainable energy, potential of piezoelectric energy harvesters to convert mechanical vibrations into electrical has become increasingly important. This study focuses on composites, in particular a BaTiO3/PLA (Barium Titanate/ Polylactic Acid) system with different volume percentages BaTiO3 ceramic particles (20%, 40% and 60%), aim optimizing conversion efficiency. A mathematical model is introduced, encompassing material attributes, loading frequencies...
Solar Thermoelectric Generators (STEG) are gaining attention for clean energy but face nonuniform temperature distribution due to optical concentrators and heat sinks. While prior studies used central circles or identical squares represent variations, this paper examines six circular rectangular patterns. Using COMSOL, the TEG module was simulated under four boundary conditions: (1) uniform temperatures on both sides, (2) patterns hot side, (3) cold (4) sides first time. Experimentally, I-V...
Chitosan, which is a derivative of chitin, particularly popular due to its biodegradable and renewable nature. However, the properties chitosan can be inconsistent extraction process natural origin, poses challenge use in composite materials as matrix. The tuned by controlling degree deacetylation (the extent acetyl groups are removed from chitin form chitosan) molecular weight. This paper presents detailed study on characterization shrimp shells. structural thermal mechanical were studied...
Collecting the vibration energy existing in surrounding environment and its transformation to a useful electrical order supply ultra-low power systems remains an emerging promising technology. During last decades, most of research efforts dealt with energy-harvesting technology using piezoelectric ceramics. However, those materials are stiff limited mechanical strain abilities. In addition, they lose their stiffness piezoelectricity at high levels strain. Thus, unsuitable for many...
This paper investigates energy harvesting performances of porous piezoelectric polymer films to collect electrical from vibrations and power various sensors. The influence void content on the elastic matrix, dielectric, electrical, mechanical properties produced available commercial poly(ethylene-co-vinyl acetate) using an industrially applicable melt-state extrusion method (EVA) were examined discussed. Electrical characterization showed increase in harvested current a decrease Young’s...
The performance of the thermoelectric module highly depends on geometry legs, area, and implicitly number pairs, besides properties materials. legs consists shape, dimensions three axes, whether are filled or hollow. can have one hollow more, hole be from top to bottom not. This paper studies compares different modules in function shape: square, triangular, trapezoid, reverse hourglass, inverse hourglass (filled with not), length width. simulations performed using COMSOL Multiphysics...
Electrostrictive polymers have been investigated as electroactive materials for electromechanical energy harvesting. This kind of material is isotope, i.e. there no permanent polarization compared with piezoelectric material, so in order to ensure its and scavenging energy, the electrostrictive need necessarily an application a static field. To avoid this problem, we used hybridization polymer electret. The present work aims analytical modeling predicting power convert when was mechanically...
The microelectromechanical systems invade gradually the market with applications in many sectors of activity. Developing these micro-systems allows deploying wireless sensor networks that are useful to collect, process and transmit information from their environments without human intervention. In order keep micro-devices energetically autonomous using batteries because they have a limited lifespan, an energy harvesting ambient vibrations electrostrictive polymers can be used. These present...
More recently, the ferroelectric ceramic/polymer composites have been progressively replacing ceramics and polymers as they combine their interesting properties. Such high compliance of electromechanical coupling those are required for piezoelectric transducer applications. At same time, formalism predicting energy-conversion capabilities is both academic industrial interest. The novelty this paper that electrical power harvested by PZT/PU polarized composite has expressed in terms effective...
Energy harvesting is a very promising area for clean energy production, especially unused and wasted sources such as thermal energy. Therefore, pyroelectric PU- x PZT material implemented to convert waste heat into electricity make low-energy devices autonomous contribute sustainable development. The goal of this contribution present the relevant methods using composite, where = 10%, 20% 30% optimize in order systems from point view. In regard, an experimental setup was carried out polarize...
There is a large amount of thermal energy wasted during the driving cycle all kinds vehicles. In this paper, pyroelectric harvester system, based on temperature change, designed for low-powered sensors reliable electronic/electric architecture development autonomous fact, was designed, specifically, in order to capture braking system and convert heat contact process electrical energy. This conversion occurs due variation through material, given cooling phenomena ambient air. The potentially...
The cymbal piezoelectric transducers have been considered for a long time due to their feasibility harvesting energy from high-level vibration sources. In fact, thick elastic caps enhance the resistance of material bear high levels. addition, allows producing large longitudinal stresses in under perpendicular load applied on top endcap, which is profitable micro-energy harvesting. However, materials cannot support larger tensional stresses; thus, such serious problem when working...
The ferroelectric materials have been used in several piezoelectric sensors and actuators applications. Under strong mechanical electrical driving levels, the nonlinear behavior of these can be described by second order constitutive equations. However, their hysteretic cannot modeled In this paper, a novel phenomenological model was developed to describe behaviors ferroelectrics subjected strengths. model, based on theory Landau-Devonshire, simulate polarization/electric field cycles under...