Search results for " Wind"
showing 10 items of 403 documents
An Innovative Photovoltaic Luminescent Solar Concentrator Window: Energy and Environmental Aspects
2022
Over the years, different types of smart windows have been tested and developed. In this study, an innovative prototype of a photovoltaic smart window, that integrates luminescent solar concentrators, was analysed. The device independently regulates the movement of the shading system and allows energy surplus, through the electricity generated by modules. Considering the peculiar structure (characterized by the presence of a light shelf) and the thermal characteristics of the device, the analyses focused on optical, thermal, and electrical performances, comparing them with those of a traditional window. The analysis followed an experimental approach that involved lighting and electrical mon…
A Ferrite Tubular Linear Motor (FTLM): Analysis and design
2015
The electromagnetic linear machines have wide applications in the electromagnetic aircraft launch systems [1] and in transportation systems [2]. Additional energy saving and efficiency can be achieved using a linear motor in the refrigeration application [3]. Linear electromagnetic machines are also very suitable for high-speed packaging, manufacturing sectors and precision positioning. There are different linear motor topologies. Tubular permanent-magnets are particularly attractive since they have a high thrust force density and high efficiency, no end windings, and zero net attractive force between stator and armature. There are various tubular motor topologies, in which the armature may…
Wave and Wind Energy Systems Integration in Vietnam: Analysis of Energy Potential and Economic Feasibility
2020
Vietnam energy demand is currently growing at a very high annual rate, with the government being very interested in investments in renewable energies. Since the region with the highest solar and wind potential is far away from the big load centers, an investigation of offshore energy resources is here proposed. In this study, a review of previous energy potential assessments is provided. Moreover, the minimum feed-in-tariff to make the investments profitable is evaluated, showing that the current tariff for offshore wind plants is largely unattractive.
Introduction of Offshore Wave, Wind and Solar Energies in Vietnam
2020
In Vietnam, the energy demand shows an ever-increasing trend. To limit the utilization of fossil fuels and the following consequences for the environment, renewable energy sources must be adopted. In this context, the paper assesses the utilization of offshore wind and sea wave, by considering a commercial wind turbine and a prototypical wave energy converter. Solar energy can be optionally also collected by this device. An algorithm is introduced to find the best composition of the three sources able to cover a desired share of energy demand. The approach is applied to Ca Mau, a province in the southern part of Vietnam. Finally, the results encourage the adoption of these energy sources th…
A telescopic wind tower with reduced environmental impact - The Perima Project
2019
A prototype of a telescopic pole for wind energy production with low environmental impact and its lifting system for a 60 to 250 kW turbine and a height of 30 m have been designed and manufactured. A telescopic tower, which is raised and lowered by automation or by remote control, allows to differentiate the presence of the generator within the landscape over time. Research target: the optimal design of the telescopic coupling, the design for maintaining the preload and for the rotational decoupling, the optimization of the pairs of sleeves, the design of the pegs and the bushes of the jack-up lifting system. All the components of the wind tower have been preliminary analyzed through FEM st…
Wind tunnel testing, numerical analyses and shape optimization of a vertical axis wind turbine
2011
In this work the aerodynamic efficiency of a small commercial vertical axis wind turbine is investigated experimentally and numerically. The turbine is a Darrieus type with three vertical airfoil blades having helical twist of 78 degrees, height 1.45m and diameter of 1.45m. The airfoils have a chord of 222 mm and a thickness of 35 mm. The experimental studies were made in a wind tunnel where a hot-wire anemometer was used to measure the wind speed. The power curves of the turbine were extracted using a generator connected with an inverter able to vary the resistant moment applied to the turbine and to measure its resulting angular speed. The energy produced by the turbine itself at various …
Palo telescopico per produzione eolica con ridotto impatto ambientale
2017
Tra il 2015 e il 2016 un consorzio costituito da differenti partner ha sviluppato un progetto di ricerca per la realizzazione di un prototipo di un palo telescopico per produzione eolica con ridotto impatto ambientale ed il relativo sistema di sollevamento per una turbina di potenza da 60 a 250 kW e un’altezza di 30 m. Un palo eolico telescopico, che si solleva e si abbassa mediante automatismi o mediante controllo remoto, consente di differenziare nel tempo la presenza dell’aerogeneratore all’interno del paesaggio. La tecnologia attualmente disponibile per la movimentazione assiale dei pali eolici è applicabile a infrastrutture con altezze inferiori ai 10 metri e a pali ribaltabili di alte…
Financial Measures for Supporting Wind Power Systems in Europe: A Comparison between Green Tags and Feed’in Tariffs
2008
Distributed Generation demonstrates to be able to significantly influence the electric power system, bringing considerable benefits to the quality of service and improving the energetic efficiency of the distribution network. In particular, in the last few years, Distributed Generation from renewable energy sources is considerably increased thanks to the many support policies promoted worldwide with the aim of facing the environmental issue and the problem of the permanent rise of prices of the fossil energy. In this contest, after a brief review on the financing strategies carried out in Europe in the last decade for promoting the recourse to renewable energy, the paper presents a comparis…
Does More Context Help? Effects of Context Window and Application Source on Retrieval Performance
2021
We study the effect of contextual information obtained from a user’s digital trace on Web search performance. Contextual information is modeled using Dirichlet–Hawkes processes (DHP) and used in augmenting Web search queries. The context is captured by monitoring all naturally occurring user behavior using continuous 24/7 recordings of the screen and associating the context with the queries issued by the users. We report a field study in which 13 participants installed a screen recording and digital activity monitoring system on their laptops for 14 days, resulting in data on all Web search queries and the associated context data. A query augmentation (QAug) model was built to expand the or…
Salvatore Sciarrino. The Sicilian alchemist composer
2012
Salvatore Sciarrino (Palermo, 1947) began his career in the fervent climate of the six Settimane Internazionali Nuova Musica. Still very young he attracted the attention of the musical world, with his sonorous invention full of startling innovation that was to make him one of the protagonists of the contemporary musical panorama. Sciarrino is today the best-known and most performed Italian composer. His catalogue is a prodigiously large one, and his career is dotted with prestigious prizes and awards. Alchemically transmuting sound, finding new virginity in it has for fifty years been the objective of his music. Timbric experimentation is the goal of his virtuosity. The prevailing use of ha…