Search results for " tecnica"

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

2008

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…

Short term wind speed prediction using Multi Layer Perceptron

2012

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…

Life cycle assessment of building materials: A comparison by electre methodology

1996

There is a growing awareness that in selection of building materials the designer must also consider environmnental impacts, either in global and local scale. Unfortunately, design community has an inadequate knowledge about the factors that affects environmental consequences of producing and operating buidings. To increase understanding on selection criteria and comparison of building alternatives in an “energy and environmental point of view”, is a significant goal for restraining gloabl enevironmental degradation. An interesting approach for assessing comparable products is the so called “multicriteria decision making”, but there is much debate about aggregation of criteria and weights a…

A new hybrid procedure for the definition of seismic vulnerability in Mediterranean cross-border urban areas

2016

Assessment of seismic vulnerability of urban areas provides fundamental information for activities of planning and management of emergencies. The main difficulty encountered when extending vulnerability evaluations to urban contexts is the definition of a framework of assessment appropriate for the specific characteristics of the site and providing reliable results with a reasonable duration of surveys and post-processing of data. The paper proposes a new procedure merging different typologies of information recognized on the territories investigated and for this reason called “hybrid.” Knowledge of historical events influencing urban evolution and analysis of recurrent building technologie…

Assessing the electricity consumption of outdoor lighting systems in the presence of automatic control: The OL-BAC factors method

2020

Abstract Building automation systems are able to influence significantly buildings’ energy performance. The BAC factors method, presented for the first time by the International Standard EN 15232, is the most used and simple instrument for evaluating the impact of such systems in terms of reduction of the electrical and thermal energy consumption of buildings services. Nevertheless, Standard EN 15232 does not take into consideration the automation of lighting systems serving buildings’ external areas like passages, gardens, entrance walkways, etc. In some cases, such areas can be very extended and, as a consequence, responsible for a not negligible percentage of the overall electricity cons…

Convezione Naturale in un Canale Verticale Riscaldato: un algoritmo per la gestione automatica mediante LabView della movimentazione della sonda anem…

2002

Si è progettato e realizzato un sistema semiautomatico per acquisizione dati finalizzato allo studio della convezione naturale in un canale verticale riscaldato, applicabile ad un’apparecchiatura sperimentale già esistente in un laboratorio del Dipartimento di Ricerche Energetiche ed Ambientali (DREAM). Tale sistema si è reso necessario in quanto detta apparecchiatura sperimentale era corredata da una serie di strumenti risalenti ad una configurazione in buona parte datata, e che quindi presentava molti limiti. In particolare essa utilizzava un vecchio linguaggio Basic HP ormai del tutto abbandonato, e pertanto non suscettibile di implementazione. Per di più non è compatibile con gli attual…

Simplified analytical model for moment–axial force domain in the presence of shear in R.C. members externally strengthened with steel cages

2015

Equations for a hand calculation of moment–axial force domain in the presence of shear for R.C. beam/column externally strengthened with steel angles and strips are developed. The analytical derivation is made assuming, for axial load and flexure, the equivalent stress-block parameters for internal forces, considering the confinement effects induced in the concrete core by external cages both in the cases of strips or angles yielding. Limit states due to bond failure, concrete crushing and yielding of steel angles and strips in flexure and in shear, including moment-to-shear interaction, are considered. The proposed model gives results in a good agreement with available experimental data an…

Modellizzazione energetico – ambientale per la valutazione di criteri di efficienza energetica

2010

Exemple du projet Arena Naterre

2014

L’article traite de façon technique le travail réalisé sur le projet Arena Nanterre (projet de Christian de Portzamparc) à Paris dans le cadre d’une mission de BIM (Building Information Model). Notre engagement était d’aider tous les intervenants à concevoir et construire autrement le bâtiment grâce à la maquette numérique. Celle-ci a évolué et a été mise à jour tout au long des études pour permettre, d’un côté, un partage réel et instantané des informations et, de l’autre, une optimisation du projet en termes techniques, économiques ou encore de gestion. L’organisation mise en place a permis de créer une plateforme collaborative dans laquelle nous étions en charge de la gestion BIM de tout…

Building integrated solar thermal design: assessment of performances of a low cost solar wall in a typical Italian building

2016

Abstract Present work deals with the topic of building integration of solar thermal collector (BIST) as a refurbishment measure. Such equipment, more than its main function as heating generator, plays a specific role as a building component (envelope finishes, thermal insulation layer, roof cover etc). Consequently, from a heat transfer point of view, an integrated component affects twice the global building balance: supporting the thermal plant (i.e. providing heat for final uses) and modifying the wall heat-transfer pattern (i.e. reducing thermal losses). In turn, the collector performance itself is influenced by the wall structure (back losses reduction). Present work proposes a method f…