8/3/2019 Hermenean

1/2

Optimizarea eficienei sistemelor fotovoltaice prin orientare biaxial i concentrare a radiaieifolosind oglinzi plane

Efficiency Optimization of Photovoltaic Systems through Bi-axial Orientation and SolarRadiation Concentration using Plane Mirrors

Ing. Ioana Snziana I. HERMENEAN , Conductor tiinific: Prof.dr.ing. Ion VIA

REZUMAT

Schimbrile climatice i epuizarea resurselor de combustibili fosili au condus la accentuareainteresului pentru surse de energie regenerabil. O direcie prioritar de cercetare i dezvoltare

pe plan mondial o constituie conversia fotovoltaic. Pentru optimizarea eficienei conversieifotovoltaice, prin mrirea gradului de utilizare a radiaiei solare disponibile, se folosesc sistememecanice de orientare i elemente optice n vederea concentrrii radiaiei pe suprafaafotovoltaic.

ncadrndu-se astfel pe aceast direcie de cercetare, lucrarea de fa are ca obiectiv general:optimizarea eficienei conversiei fotovoltaice prin mrirea gradului de utilizare a energiei

solare, folosind mecanisme de orientare a modulelor PV i sisteme de concentrare joas aradiaiei prin oglinzi plane.

Pornind de la informaiile ntlnite n literatura de specialitate, prima etap a cercetrii aconstat n studiul parametriilor geometrici care influeneaz sistemele de concentrare joasfotovoltaic cu oglinzi plane. A urmat modelarea analitic a eficienei sistemelor fotovoltaice

prin modelarea radiaiei solare, a geometriei sistemelor PV cu concentrare joas prin oglinziplane i a radiaiei solare receptat prin orientare de tip ecuatorial, pseudo-ecuatorial i azimutal.O alt etap a constat n dezvoltarea i implementarea demonstratorului LCPV individual cuorientare azimutal cu precizie ridicat, construit modular, cu posibilitatea de instalare adiverselor tipuri de module fotovoltaice, n vederea testrii acestora, n condiiile concentrriiradiaiei. De asemenea s-au analizat, prelucrat i interpretat datele experimentale nregistrate i

s-au evideniat performanelor energetice aduse de sistemul LCPV i sistemul PV nclinat fix.Concluziile i rezultatele obinute n cadrul acestei teze de doctorat recomand utilizareasistemelor fotovoltaice cu concentrare joas n condiiile zonei Braov i, implicit, continuareacercetrii i dezvoltrii acestora.

ABSTRACT

Climate change and depletion of fossil fuels have led to increased interest in renewableenergy sources. A priority for research and development worldwide is the photovoltaicconversion. To optimize solar conversion efficiency by increasing the use of available solarradiation, mechanical systems are used for guidance and optics to focus the radiation on the

photovoltaic surface.

Thus fitting in this line of research, the paper aims to optimize PV solar conversionefficiency by increasing the use of solar energy using tracking mechanisms and lowconcentration of radiation by plane mirrors.

Starting from the state of the art, the first stage of the research was the geometrical study ofthe parameters that influence the low concentration photovoltaic systems with flat mirrors.Analytical modeling followed by radiation efficiency modeling of the LCPV systems withtracking of type: equatorial, pseudo-equatorial and azimuth. Another step was the developmentand implementation of an individual demonstrator LCPV with azimuth orientation of high

precision, modular building, with the possibility of installing various types of photovoltaicmodules to test their concentration under radiation. Also were analyzed, processed andinterpreted the recorded experimental data and the energy performance of the LCPV system

compared to the fix tilted PV system was highlighted.The conclusions and results obtained in this PhD thesis recommends the use of photovoltaic

8/3/2019 Hermenean

2/2

systems with low concentration in the Brasov area conditions and therefore further research anddevelopment.

2