1,721,053 research outputs found
SUPARSTHAS and SWAGWAUTAS: Colonisers of the Ancient World. Part II: Late migrations.
Full text linkIn the second part of this study the main migrations of the peoples descending from *Suparsthas and *Swagwautas are reconstructed in Asia and Europe from the second millennium BC to the tenth AD. The role of Etruscan relative peoples in the evolution of Indo-European nations and languages is investigated and highlighted
Experimental Characterization of a New Hybrid Thermophotovoltaic Industrial Prototype
No full textAbstractThe described work involves the construction and experimental characterization of a new hybrid thermophotovoltaic prototype panel for small vessels and vehicles applications. The first prototype, previously numerically optimized by genetic algorythm, has been entirely built in the university lab in Forlì. Concerning the presented results, they show some of the last outdoor experimental analysis under specific site outdoor conditions. Subsequently the aim of this analysis has been to evaluate further improvements data concerning concept design in order to ensure for next prototypes the optimal integration of mechanical properties and specific output requirements requested by users
Integrated PV-TEG Cooling System and Support
Full text linkBeing continuously exposed to solar radiation, photovoltaic cells usually overheat, resulting in rapid degradation over time. For the same reason, the efficiency of energy production also decreases. To overcome these problems, the proposed integrated TEG cooling system removes heat from the cells during periods of strong solar radiation. In contrast to existing products that use the Seebeck or Peltier effect, within the patented system, the given Seebeck effect occurs internally at the same heat sink that acts as a support for the cells and only a small part of the removed heat is used to create the required temperature difference. The invention concerns a drastic simplification of solar cell cooling and thermoelectric conversion technology. This also allows for cascading economic advantages in terms of overall system costs. A preliminary numerical analysis was carried out to analyse the characteristics of the prototype
Innovativa piastrella termofotovoltaica calpestabile in resina.
No full textLa piastrella sviluppata dagli inventori è costituita da uno strato di celle
fotovoltaiche poste a contatto, mediante pasta termoconduttiva, con un
dissipatore di calore in lega di alluminio che trasferisce il calore dalle celle
al flusso d'acqua. La parte inferiore del dissipatore di calore e i connettori
idraulici ed elettrici sono incapsulati in una resina opaca e termoisolante.
La parte superiore e le celle sono ricoperte da una resina trasparente.
Tale soluzione risulta idonea per qualunque superficie piana esposta
all'irraggiamento solare, spesso non fruibile e/o inutilizzata dal punto di
vista energetico, permettendo una doppia fruizione energetica (termica ed
elettrica) ed una garantita calpestabilità 365 giorni l’anno
Use of microspheres in thermally insulating hybrid solar panels
No full textIn this work the problem of thermally insulating a PhotoVoltaic Thermal (PVT) hybrid solar panel is investigated. In particular, a
PVT panel designed to be laid on the ground like a tile is considered. Such a hybrid solar tile, previously presented, is resistant,
walkable and can be used to cover places, terraces and roof. It consists in a core composed of a photovoltaic cell layer placed in
contact with an aluminum heat sink which transfers heat from the cells to a water flow. This core
is coated on the upper side with
a transparent epoxy resin and on the lower and lateral sides with an opaque epoxy resin. To thermally insulate such a panel, the
insertion of microspheres in the opaque resin is then considered. In particular, the maximum concentration of the microspheres
acceptable with respect to the production process is evaluated. Moreover, the effect
on the heat dispersed by the panel, which is
produced by inserting microspheres in the opaque resin, is experimentally investigated. Some preliminary results are presented
showing reductions in the dispersed heat
Experimental dataset of seasonal behaviour of a hybrid solar tile
Full text linkThe state of the art of research related to thermophotovoltaic hybrid panels has been widely described by Zondag et al. [1,2] and Michael et al. [3]. Through a seasonal experimental campaign, conducted with an outdoor test bench in Forlì (North-East of Italy), a hybrid thermophotovoltaic tile has been investigated. The double resin hybrid tile, patented by University of Bologna, is mechanically resistant, walkable and can be used to cover surfaces in order to obtain a full exploitation of the horizontal covers from an exergetic and functional point of view. The glass cover is replaced with a resin one that aims to achieve comparable optical properties but also to improve the mechanical characteristics, making it walkable and facilitating cleaning and maintenance. An extensive dataset was collected over several days of seasonal testing with the aim of determining its electrical and thermal performance compared to commercial PV (photovoltaic) panels of the same size placed in the same experimental apparatus
Innovative Thermophotovoltaic Hybrid Resin Tile
Full text linkThe product developed and here presented is the result of a widespread research project
related to hybrid thermophotovoltaic panels. Starting from the numerical analysis, experimental testing and
relative optimization of different hybrid solutions, we moved on final prototyping of an innovative
thermophotovoltaic bi-resin walkable tile suitable for covering different kinds of surfaces subjected to solar
radiation. The tile is made up of a layer of photovoltaic cells placed in contact, by means of a thermoconductive
paste, with an aluminum alloy heat sink which transfers the heat from the cells to the water flow. The bottom of
the heat sink and the hydraulic and electrical connectors are encapsulated in an opaque insulated resin. The top
and the cells are covered with a transparent resin. This solution is suitable for any flat surface exposed to solar
irradiance (often not usable and / or unused from an energy point of view) allowing a double energy output
(thermal and electric) and a guaranteed walkability 365 days a year
An Innovative Design of Heat Sink for Microelectronics
No full textSome high-effectiveness heat sinks of novel conception are proposed for the forced cooling of electronic devices.The heat sinks –eight models in total- can be easily machined at low production costs.The performance of the heatsinks under steady-state conditions is experimentally investigated, when these are heated by a source at uniform tem-perature. In particular, the temperature of the heat sink surface in contact with the devices to be cooled is measuredtogether with the temperature of the cooling air. Two configurations of the fan are tested, namely a blowing and asucking arrangement. The pressure drops for both cases are also measured for each heat sink. The thermal resistanceof the heat dissipators, together with their weight, is then calculated and compared to that of heat sinks commerciallyavailable, one of which has also been tested under the same experimental conditions. It is concluded that such newdesign is competitive with the devices currently available, as the production costs and weight are lower and perform-ances are either comparable or better
Pannello termofotovoltaico e procedimento di realizzazione di pannello termfotovoltaico
No full textL'oggetto brevettato è un pannello termofotovoltaico di tipologia innovativa, che può essere utilizzato per pavimentare piazzali o terrazzi oppure per ricoprire tetti. Il pannello è costituito da uno strato di celle fotovoltaiche posate su di un blocco di alluminio nel quale sono stati ricavati dei canali all'interno dei quali scorre una portata di acqua. Lo stato di celle e lo scambiatore di calore di alluminio sono rivestiti con una resina trasparente sulla parte superiore e con una opaca su quella inferiore. La resina opaca è utilizzata anche per creare gli appoggi del pannello, che ne consentono la posa sopra una rete di tubazioni e di cavi. Il pannello viene realizzato mediante colatura delle resine in un particolare stampo
Experimental characterization of a hybrid industrial solar tile
No full textIn this work an innovative hybrid solar panel is presented. The panel is particularly resistant. It is walkable and can be used as a tile to cover places, terraces and roofs. It consists in a photovoltaic cell layer placed in contact with an aluminium heat sink which transfers heat from the cells to a water flow. The lower part of the heat sink and the hydraulic and electrical connectors are encapsulated in an opaque and insulating resin. The upper part and the cells are covered with a transparent resin. The heat sink consists in an aluminium block in which some channels and the input and output plena are created. In the prototype version of the panel, a circular section has been assigned to the channels. Some preliminary results are presented, which have been obtained on the hybrid panel prototype. In particular the efficiency of the photovoltaic cells has been investigated by changing the water temperature and flow under different solar conditions
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