2,851 research outputs found
Energy demand for space heating through a statistical approach: application to residential buildings
No full textThis study deals with the statistical analysis of a data set of residential buildings to find simplified
correlations for the assessment of the energy demand for space heating.
The analyzed data come from a sample of 50 multi-family residential buildings of the local social
housing company, built in different periods between the end of the 19th century and the end of the last
century. Relationships are searched between the age of the building and its main geometric and thermophysical
properties: the shape ratio, the volume, the opaque and glazed surfaces, their transmittances,
the external and internal temperatures. These properties are suitably combined to find out statistical
relations. Moreover, starting from standard deterministic equations, this study revises them and
simplifies the most involved terms. This simplification is carried out making a statistical analysis of the
energy quantities that affect the performance of a building. In such a way the solution of the energy
balance is simplified, making the calculation easier and faster. Results are compared with those
calculated using the rigorous Standard procedure, showing a good agreement. Moreover, the assessed
energy demand is compared with the actual metered energy consumption.
The present statistical model estimates in a simple and prompt way the energy demand for space
heating of residential buildings, in particular the existing ones. It may represent a useful tool for their
energy certification
Indagine sul teleriscaldamento attivo nel contesto europeo
No full textLo studio si propone di fare il punto della situazione sulle reti di teleriscaldamento attivo attualmente operanti nel contesto europeo, prendendo in considerazione aspetti tecnici, economici e regolatori intercorrenti tra l’utility e l’utente produttore/consumatore di calore (prosumer). Lo studio ha evidenziato come nei vari Paesi siano state adottate soluzioni tecnologiche e gestionali differenti. Nonostante la diffusione del teleriscaldamento attivo sia tuttora limitata ad un numero piuttosto esiguo di casi nel Nord Europa, alla luce della presente indagine emerge come questa soluzione tecnologica possa giocare un ruolo da protagonista nelle future politiche di efficientamento dei sistemi di produzione e di distribuzione efficiente del calore orientate alla decarbonizzazione
Proposal of a statistical model for the estimation of energy demand for space heating in residential buildings
No full textMonitoraggio dei prezzi del GPL nel settore residenziale, dalle serie storiche uno strumento per valutare le differenze a livello locale
No full textA differenza dei principali combustibili utilizzati in ambito domestico (energia elettrica, gas naturale, gasolio) per il GPL distribuito sfuso o in bombole non esiste un’Autorità che raccolga periodicamente i prezzi al consumatore a livello nazionale, bensì i dati sono pubblicati dalle singole Camere di Commercio. Dal monitoraggio e dall’analisi dei database provinciali nel periodo compreso tra il 2012 e il 2017 sono emerse significative differenze locali nei prezzi di listino, che riflettono un contesto di mercato liberalizzato
The Permanent Monitoring System of the Campi Flegrei Caldera, Italy
No full textWe present the main features of the permanent monitoring system managed by the Istituto Nazionale di Geofisica e Vulcanologia-Osservatorio Vesuviano in the Campi Flegrei caldera. Eruptive history of this active volcano shows that the majority of the eruptive events has been characterised by high explosivity and was accompanied by pyroclastic density currents. Its last eruption occurred in AD 1538 and in the next centuries the Campi Flegrei caldera has experienced several episodes of bradyseism and also the progressive increasing of the urbanisation in the area (west of Naples). Monitoring the dynamics of a mainly explosive volcano completely embedded in a very populated area is a challenging task. In order to detect any variation in the physical and chemical parameters of the Campi Flegrei caldera, the Istituto Nazionale di Geofisica e
Vulcanologia-Osservatorio Vesuviano manages a permanent multi-parametric monitoring system. All the recorded h24 continuous data are transmitted to the Monitoring Room of the Osservatorio Vesuviano in Naples, where they are acquired, processed and evaluated to define changes in the dynamical state of the volcano. The caldera, since the end of 2004, is experiencing a bradyseismic episode characterised by a low velocity rate uplift, low energy earthquakes and increasing in the magmatic components of fumarolic fluids.
The monitoring and surveillance activity of the Campi Flegrei caldera plays a crucial role in the volcanic emergency plan that includes evacuation of approximately 500,000 people before the beginning of the eruption.Published219-2376SR VULCANI – Servizi e ricerca per la società1IT. Reti di monitoraggio e sorveglianza2IT. Laboratori analitici e sperimentali4IT. Banche dat
Who is the author of the 1876 Stefano manuscript?
No full textFor over one hundred years the Stefano manuscript was a private document in the possession of the Baccich family and descendants. It told a story of the 1875 Stefano shipwreck as narrated by the shipwreck survivor and the founding family patriarch Miho Baccich. In these circumstances the question of authorship of the manuscript was immaterial and did not arise as an issue. However, with the publication of the manuscript the author‟s name, or names, need to be formally attributed to it. It turns out that this is not such a clear-cut matter.
As we shall see, all informed sources attributed the authorship, and the ownership, of the manuscript to Miho Baccich. But the manuscript itself was written by Canon Stjepan Skurla – a priest from Miho‟s hometown of Dubrovnik. The question then arises: should Skurla also be considered as an author of the manuscript, or, even as the sole author (as some would have it)
Caldera subsidence in extensional tectonics
No full textWe consider here the effect of extensional tectonics
on the dynamics of large calderas. Active calderas are generally
characterised by different periods of uplift and subsidence, in
some cases spaced out by eruptions. Understanding of mechanisms which produces caldera uplift/subsidence is one of the
main topics of volcanological research but is still a matter of
debate. Using a simple conceptual model, we show analytically
that the tectonic extension and its rate can produce the condition
for the subsidence, in early stage, which in turn can also yield
the magma migration (uplift) and, eventually, eruption. This
work provides a possible hypothesis for caldera dynamic,
which initiates due to chamber depressurisation and evolves
towards potential conditions for magma re-mobilization as a
consequence of tectonic loading. The conceptual model is also
applied to the Campi Flegrei caldera (Italy), showing that the
observed subsidence may be a result of extensional processes.Published8706V. Pericolosità vulcanica e contributi alla stima del rischioJCR Journa
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