Ricerc@Sapienza

Heating and cooling in buildings is a central aspect for adopting energy efficiency measures and implementing local policies for energy planning. The knowledge of features and performance of those existing systems is fundamental to conceiving realistic energy savings strategies. Thanks to Information and Communication Technologies (ICT) development and energy regulations’ progress, the amount of data able to be collected and processed allows detailed analyses on entire regions or even countries.

An improved algorithm to generate skeletal mechanisms from the original detailed chemical kinetic mechanisms is proposed. The new algorithm builds on the computational singular perturbation (CSP) framework, by adding an additional layer of automation based on the tangential stretching rate (TSR) and the species’ participation index to TSR. The main advantage of the new approach is that it does not require the specification of a set of target species.

Turbulent premixed flames at high Karlovitz numbers exhibit highly complex structures in different reactive scalar fields to the extent that the definition of the flame front in an unambiguous manner is not straightforward. This poses a significant challenge in characterizing the observable turbulent flame behaviour such as the flame surface density, turbulent burning velocity, and so on. Turbulent premixed flames are reactive flows involving physical and chemical processes interacting over a wide range of time scales.

In this study Ni-Co-W alloys have been produced by electrodeposition on Al net. Two electrolytic baths, with and without sodium citrate, having the same metal ion content (20 g/l Ni, 8 g/l Co and W in the range 2-8 g/l) and boric acid content 20 g/l, have been used. Temperature and current density operative conditions have been varied in the range 30-60 degrees C and 260-350 A/m(2) respectively.

The aim of the paper is to preliminary analyse the performance of several nearshore Wave Energy Converters (WEC) sited in the west coast of Sicily close to the Favignana island's shorelines. In particular, the four WEC technologies that have been considered are Wave Star, Oyster, Wave Dragon and Archimedes Wave Swing. The power performance assessment has been developed through the comparison of various scaled versions of the WEC using a proved scaling process based on the Froude similitude.

Energy costs, carbon dioxide emissions, security of supply and system stability are common challenges in small islands. Many European islands have become pilot sites of energy innovation, but this green transition goes slowly in other ones usually not connected to the national grid.

The forecasting of electricity load is considered as an essential instrument, especially in countries with a restructured electricity market. The mid-term prediction is performed for the period within 1 month to 1 or 2 years and it is important for mid-term planning, including planning of repairs and economic exploitation of power systems, which are related to the reliability of the system directly. The forecast horizon in this paper is monthly and on a daily basis (peak load).

Il concetto di Smart Campus ha iniziato a svilupparsi negli ultimi anni come possibile adattamento del modello di città intelligente ai campus universitari. La trasformazione di un campus standard in uno Smart Campus richiede lo sviluppo di un quadro di valutazione che consenta di valutare lo stato dell'arte mediante indicatori compositi. Applicando una nuova metodologia, lo scopo di questo progetto è definire un insieme globale di indicatori.

The present study investigates an oil spill event in the Al Khafji region using Sentinel 1 SAR images. Al Khafji is on the border between Saudi Arabia and Kuwait in the Persian Gulf and it is considered a neutral zone. Al Khafji region has the potential to produce more than 470,000 barrels of oil per day (Mbbl/d). Methods based on multi sensor satellite images (Sentinel-2, Landsat 8, Terra, Cosmo_SkyMed, RADARSAT, etc.) analysis have been developed for detecting oil slicks from known natural seeps as well as oil spill events.

In HVDC submarine cable connections, electrodes design is paramount for technical and economic feasibility. The cathode is designed as simple as possible, if bidirectional operations are not required since reduction reactions does not produce corrosion of the material. The situation is completed reversed for the anodes submersed in seawater: in this case, the corrosion mechanism provokes removal of surface material.