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Rooftop Low Angle Tilted Photovoltaic Installation Under Polish Climatic Conditions

Zdyb Agata, Szałas Grzegorz

Journal of Ecological Engineering

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2021

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Vol. 22, nr 8

223--233

EN

The performance of a 15 kWp roof mounted, low angle tilted photovoltaic installation over the year 2019 has been analyzed in terms of the role of solar irradiation, ambient and module temperature, clouds cover and wind speed. The studied photovoltaic system operates under warm summer humid continental climate with the considerable influence of temperate oceanic zone. The role of significant changes of weather conditions in warm and cold part of the year has been shown. The negative impact of external temperature increase on the modules efficiency has been observed. The experimentally determined temperature coefficient of efficiency of the modules is equal to -0.06%/°C. Relatively high sum of insolation registered in the location in 2019 together with a lack of shade assure annual energy yield of 1098 kWh/kWp, energy density 188 kWh/m2, capacity factor 12.53% and performance ratio 82%.

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The Effect of Electrode Immersion Time and Ageing on N719 Dye-Sensitized Solar Cells Performance

Krawczak Ewelina, Zdyb Agata

Journal of Ecological Engineering

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2020

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Vol. 21, nr 6

53--60

EN

One of the most promising devices belonging to the third generation of photovoltaic technologies is dye-sensitized solar cell (DSSC). It can be considered as an economic substitute for the first and second generation of solar cells which provides relatively high conversion efficiency at low cost of material and simple manufacturing. This technology is widely developed nowadays thus it can contribute the meeting of the current and future energy demands. However, much work should be done to increase solar-electricity conversion efficiency of DSSC. It is identified that a crucial component which strongly affects the performance of the working dye-sensitized cell is dye sensitizer used to enhance the light harvesting. The adjustment of the amount of the adsorbed dye by a modification of photoelectrode immersion time in dye solution plays a crucial role. The objective of this study was to report the influence of electrode immersion time on dye-sensitized solar cells performance and to evaluate the stability of obtained cells. DSSC assemblies were prepared in the sandwich way with the working area equal to 0.8 cm2. The impact of various immersion times in N719 dye solution of the TiO2 covered photoelectrodes have been investigated. In the study, the process of encapsulation of the cells with sealant gaskets was enhanced which caused the improvement of the stability and tightness of the obtained DSSC devices. The methodological process adopted in this investigation includes measurements of current-voltage (I-V) characteristics performed right after cell preparation, and after 72 hours to evaluate the role of ageing. The characterization of the obtained solar cells was carried out under standard test conditions (STC; temperature 25°C, irradiance 100 mW/cm2, air mass AM 1.5). On the basis of I-V curves measurements, characteristic operating parameters of the obtained DSSC assemblies such as open circuit voltage (VOC), short circuit current (ISC), and maximum power point (MPP) have been established. The results of this research indicate that the time of electrode immersion in the dye solution affects strongly the DSSC performance. Thus, the control of the stage of the dye adsorption by the TiO2 layer is vitally important.

3

Photovoltaic System Integrated Into the Noise Barrier – Energy Performance and Life Cycle Assessment

Zdyb Agata, Żelazna Agnieszka, Krawczak Ewelina

Journal of Ecological Engineering

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2019

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Vol. 20, nr 10

183--188

EN

The presented work is devoted to the analysis of the performance of an installation comprising photovoltaic modules (3.56 kWp) integrated into a noise barrier under temperate climate. The application of the DDS-Cad software enables to estimate the amount of electricity produced annually. The use of LCA (Life Cycle Assessment) method, based on the material and energy balance of the system, allows the ecological evaluation of the analyzed solution. The designed installation, in which the thin film cadmium telluride modules were applied, can produce 3390 kWh of electric energy per year. This kind of photovoltaic system can be multiplied depending on the available number of acoustic panels oriented at the desired azimuth along the highway or railway.

4

Natural flavonoids as potential photosensitizers for dye-sensitized solar cells

Zdyb Agata, Krawczyk Stanisław

Ecological Chemistry and Engineering. S

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2019

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Vol. 26, nr 1

29--36

EN

Natural flavonoids quercetin, morin, fisetin and luteolin were studied as potential photosensitizers for dye-sensitized solar cells (DSSC). Spectroscopic methods were used to investigate the formation of dye/TiO2 nanoparticles assemblies and the development of their absorption spectra. The results show that the flavonoids adsorb well on TiO2 nanoparticles and this process causes the shift of absorption spectra from the near UV into the visible range of solar light. The mode of binding of the dye molecules on TiO2 surface is analyzed by comparison of spectral absorption properties and with the use of structural differences introduced by fisetin and luteolin for discrimination between several possibilities.