MESSA A PUNTO DI UN SISTEMA SOLARE FOTOVOLTAICO-TERMICO PVT A BASSA CONCENTRAZIONE

Lo sfruttamento intensivo della risorsa solare può contribuire sensibilmente alla riduzione delle emissioni di gas clima alteranti. La crescita e la diffusione di impianti solari dipendono anche dalla capacità dell'industria di costruire e mettere in commercio collettori solari di nuova concezione ad alta efficienza energetica. Il presente lavoro descrive la realizzazione e la messa a punto di un circuito di prove sperimentali, presso il Dipartimento di Ricerche Energetiche ed Ambientali dell'Università di Palermo, relativo ad un impianto solare costituito da collettori solari parabolici lineari a debole concentrazione caratterizzati dal fatto di riunire in un’unica tecnologia chiamata CPVT…

L’influenza dei sistemi per il condizionamento dell’aria sul consumo di energia elettrica del settore residenziale: un modello neurale

Mezzi innovativi di trasporto per i collegamenti a breve raggio

Analisi statistica dei regimi di vento e di producibilità di un impianto eolico sito in Sicilia. Stima di previsione della producibilità eolica attraverso reti neurali

A Web-based Weather Monitoring Network in the city of Palermo

Small Wind Technology Diffusion in Suburban Areas of Sicily

Among renewable energy resources, wind energy became more attractive in the last decade. Wind farm installations dramatically increased in areas where climatic conditions, topography, and environment have allowed their development. The installation of wind turbines, usually carried out in remote areas, recently began to cover areas identified by a complex terrain such as urban and suburban zones. Although these new plant choices are characterized by lower productivity, there is increasing interest in wind energy production in both urban and suburban areas. In this work the authors have carried out an energy analysis developed from a sample of small wind turbines available on the market. Thi…

The Application of Different Model of Multi-Layer Perceptrons in the Estimation of Wind Speed

Wind speed forecasting is essential for effective planning of wind energy exploitation projects. The ability to predict short-term wind speed is a prerequisite for all the operators of the wind energy sector. Consequently it is essential to identify an efficient method for forecasts. In this paper, the wind speed in the province of Trapani (Sicily) is modeled by artificial neural network. Several model of neural network were generated and compared through error measures. Simulation results show that the estimated values of wind speed are in good agreement with the values measured by anemometers..

MIGLIORAMENTO DELLA RESA ENERGETICA DI UN PANNELLO FOTOVOLTAICO PER MEZZO DI MATERIALE A CAMBIAMENTO DI FASE

Short term wind speed prediction using Multi Layer Perceptron

Among renewable energy sources wind energy is having an increasing influence on the supply of energy power. However wind energy is not a stationary power, depending on the fluctuations of the wind, so that is necessary to cope with these fluctuations that may cause problems the electricity grid stability. The ability to predict short-term wind speed and consequent production patterns becomes critical for the all the operators of wind energy. This paper studies several configurations of Artificial Neural Networks (ANN), a well-known tool able to estimate wind speed starting from measured data. The presented ANNs, t have been tested through data gathered in the area of Trapani (Sicily). Diffe…

Sistema di rilevazione e pubblicazione dati meteo per la città di Palermo.

Influence of raw data analysis for the use of neural networks for win farms productivity prediction

In the last decade wind energy had a strong growth because of cost effectiveness of the technology and the high remunerative of investments.

influence of raw data analysis for the use of neural networks for wind farm productivity prediction

In the last decade wind energy had a strong growth because of cost effectiveness of the technology and the high remunerative of investments. The increase of wind power penetration in power grids, however, makes necessary the development of instruments for prediction of productivity of a wind farm. This paper presents a study dealing with the capability of neural network to forecast short term production of a wind farm by the correlation of wind and energy production data. Available measures of wind parameters were related to productivity data of a real wind farm. Also wind data not strictly related to the site have been used in order to assess their possible influence on the production. Aft…

A web-based autonomous weather monitoring system of the town of Palermo and its utilization for temperature nowcasting

Weather data are crucial to correctly design buildings and their heating and cooling systems and to assess their energy performances. In the intensely urbanized towns the effect of climatic parameters is further emphasized by the "urban heat island" phenomenon, known as the increase in the air temperature of urban areas, compared to the conditions measured in the extra-urban areas. The analysis of the heat island needs detailed local climate data which can be collected only by a dedicated weather monitoring system. The Department of Energy and Environmental Researches of the University of Palermo has built up a weather monitoring system that works 24 hours per day and makes data available i…

Quality of wind speed fitting distributions for the urban area of Palermo, Italy

Abstract This study investigates the wind speed characteristics recorded in the urban area of Palermo, in the south of Italy, by a monitoring network composed by four weather stations. This article has two main objectives: the first one, to describe with clarity and simplicity the numerical procedures adopted to perform a preliminary statistical analysis of wind speed data, providing at the same time, the necessary mathematical tools useful to perform this analysis also without special software. The second objective is to verify if there are more suitable probability distributions able to better represent the original data respect the traditional ones. After a preliminary statistical analys…

Analisi del regime anemometrico a scala urbana della città di Palermo

Allo scopo di valutare la possibilità di sfruttare l’energia eolica anche in zone fortemente urbanizzate recentemente la Comunità Europea ha posto tra le sue priorità scientifiche la redazione di atlanti eolici a piccola scala. Al fine di fornire dati che possano condurre ad una corretta valutazione eolica di centri urbani, nel seguente lavoro vengono analizzate le caratteristiche del regime anemometrico dell'area urbana di Palermo, registrate da un rete di monitoraggio automatica afferente al Dipartimento di Ricerche Energetiche ed Ambientali (DREAM) e composta da quattro stazioni meteo. Dopo un esame statistico preliminare, in cui le serie temporali della velocità del vento sono state div…

Nonlinear black-box models for short-term forecasting of air temperature in the town of Palermo

Weather data are crucial to correctly design buildings and their heating and cooling systems and to assess their energy performances. In the intensely urbanized towns the effect of climatic parameters is further emphasized by the Urban Heat Island (UHI) phenomenon, known as the increase in the air temperature of urban areas, compared to the one measured in the extra-urban areas. The analysis of the heat island needs detailed local climate data which can be collected only by a dedicated weather monitoring system. The Department of Energy and Environmental Researches of the University of Palermo (Italy) has built up a weather monitoring system that works 24 hours per day and makes data availa…

Evaluating the Performances of Small Wind Turbines: A Case Study in the South of Italy

AbstractAmong renewable energy resources, wind energy became more attractive in the last decade. Wind farms installations dramatically increased in areas where climatic conditions, topography and environment have allowed their development. The installation of wind turbines, usually carried out in remote areas, recently began to cover areas identified by a complex terrain such as urban and suburban zones. Although these new sites’ choices are characterized by lower productivity there is increasing interest in wind energy production in both urban and suburban area. In this work the authors have carried out an energy analysis developed from a sample of small wind turbines available on the mark…