229 research outputs found
Per l'iconografia cinquecentesca di Caterina Cornaro
No full textIl saggio ripercorre il formarsi dell'iconografia di Caterina Cornaro alla luce della sua vicenda biografica e della funzionalità politica attribuita alla medesima da Venezia, nonchè secondo una prospettiva celebrativa e encomiastica promossa dalla famiglia e ricca di ricadute sulla storia del collezionismo veneziano
Energy Efficiency in Buildings and Innovative Materials for Building Construction
No full textThe main topics of this Special Issue regard energy efficiency in buildings and the use of innovative materials for design and retrofitting to pursue this goal [...
Caterina e i suoi contemporanei. Annotazioni sulla presenza di Caterina Cornaro tra viaggiatori, storici e poeti.
No full textCome venne ricordata Caterina Cornaro dai suoi contemporanei? Individuazione e analisi di brani più o meno estesi in relazioni di viaggio, testi storici e poetici cronologicamente vicini ai tempi in cui visse l'ultima Regina di Cipr
Comparative analysis of crystalline and double junction amorphous silicon modules performance in outdoor conditions
No full texthe paper deals with an extensive photovoltaic (PV) modules monitoring activity carried out at the outdoor station ESTER (Solar Energy TEst and Research) of the University of Rome Tor Vergata, Italy. The purpose of the work was to evaluate and compare the performance of PV silicon modules of polycrystalline (poli-Si) and amorphous (a-Si) technologies during a medium-term outdoor exposure at optimized tilt angle, facing south. Two PV modules, one polycrystalline silicon and one double-junction amorphous silicon, have been exposed since May 2009 until Oct. 2010. A complete characterization of the weather conditions at the site during the test has been performed, and the most relevant parameters for the performance comparison of the two technologies have been derived. In order to compare different technologies and power productions, the energy yield (Y) and performance ratio (PR) for the two modules have been evaluated on a monthly and yearly basis. The typical seasonal trend of PR has been observed for the polycrystalline module, essentially due to the temperature influence on the module performance. For the a-Si module, instead, a degradation trend has been observed for the first months of operation. Subsequently, a significant recovery in the PR and energy production has been registered
Influence of Average Photon Energy index on solar irradiance characteristics and outdoor performance of photovoltaic modules
No full textSolar spectral irradiance measurements on a routinely basis are relevant to study the influence of solar spectrum on the photovoltaic (PV) module performance, especially for thin film and third generation PV. Two spectroradiometers from EKO were added to the instrumentation available at the ESTER outdoor station of the University of Rome Tor Vergata. A detailed characterisation of the spectral irradiance at the site was carried on during more than 6 months of monitoring activity measuring spectral solar irradiance in the range 350–1700 nm with a time interval of 10 min on a horizontal plane. A wide variety of spectra were acquired in various weather conditions, and indications about the spectra behaviour on a daily and seasonal basis were obtained. Moreover, information about the effect of the weather conditions on the solar radiation spectral distribution were identified. The Average Photon Energy index was used as an indicator of the spectra characteristics. The same index was also used to evidence the solar spectrum influence on polycrystalline and double junction amorphous silicon PV modules
Solar spectral irradiance measurements relevant to photovoltaic applications
No full textRecently, two spectroradiometers from EKO have been added to the instrumentation available
at the ESTER outdoor station of the University of Rome Tor Vergata, with the aim to
characterize the spectral irradiance at the site and evaluate its influence on the performances of
photovoltaic modules, especially thin films and third generation devices as Dye Sensitized
Solar Cells (DSSC). The paper will present the results of more than six months monitoring
activity where the spectral solar irradiance in the range 350 nm – 1,700 nm has been measured
continuously with a time interval of 10 minutes on a horizontal plane. A wide variety of spectra
have been acquired in various weather conditions and first indications about the spectra
behaviour on a daily and seasonal basis have been obtained. Moreover also some information
about the effect of the weather conditions on the solar radiation spectral distribution will be
presented
Performance analysis of PV modules of various technologies after more than one year of outdoor exposure in Rome
No full textThe paper deals with an extensive PV modules monitoring activity carried out at the outdoor
station ESTER of the University of Rome Tor Vergata. The purpose of the work was to
evaluate and compare the performances of PV silicon modules of polycrystalline and
amorphous technologies during a medium term outdoor exposure at optimized tilt angle, facing
south. Two PV modules, one polycrystalline by Kyocera and one double junction amorphous
by EPV Solar have been exposed since May 2009. A complete characterization of the weather
conditions at the site during the test has been performed and the most relevant parameters for
the performance comparison of the two technologies have been derived. In order to compare
different technologies and power productions, the energy Yield (Y) and Performance Ratio
(PR) for the two modules have been evaluated on a monthly and yearly basis. The typical
seasonal trend of PR has been observed for the polycrystalline module, essentially due to the
temperature influence on the module performances. For the EPV module, instead, a
degradation trend has been observed for the first months of operation. Subsequently a
significant recovery in the PR and energy production has been registered
Global, direct and diffuse radiation measurements at ground by the new environmental station of the University of Rome Tor Vergata
No full text- …
