1,721,078 research outputs found
Speciale luce naturale
No full textSupplemento di 16 pagine a "Il Giornale dell'Architettura", pubblicato nel numero 113 nel mese di marzo 2013. Il supplemento contiene diversi articoli dai titoli: "Daylighting design: valore economico, comfort e risparmio energetico" (di Valerio R.M. Lo Verso); "La luce per plasmare spazi di qualità" (intervista a Maurizio Varratta, di Laura Milan); "La luce è un materiale fondamentale per l'architettura" (di Giulio Antonutto e Roberto Caria); "Please don't take my sunshine away" (di Federica Caffaro); "Un'alleanza che apre nuove possibilità" (di Valerio R.M. Lo Verso); "La luce come parametro di valutazione" (di Mariadonata Bancher, Martina Demattio, Gabriele Frasnelli); "Istruzioni per l'uso" (di Carlo Micono); "Model Home 2020: sei edifici efficienti" (di Velux); "Verso un protocollo «Active House» per il clima mediterraneo: Brera e Svevah" (di Arianna Brambilla, Michele Sauchelli); "VELUXlab. Architettura «attiva» per il futuro" (di Marco Imperadori
La progettazione dell’illuminazione naturale mediante cieli artificiali: rassegna delle strutture esistenti
No full textThe energy demand for electric lighting as a consequence of different architectural building features and lighting plant characteristics
No full textThis paper focuses on energy demand for electric lighting in office buildings: in particular, aim of the study is to estimate the variation of electric lighting energy demand in response to changes in some building features such as orientation, room depth (from a private to an open-plan office), window size (expressed in terms of window- to-wall ratio, which was varied in the range 0,2 – 0,6) and external obstruction (varied in the range 0° - 75° of obstruction angle). Furthermore, the impact of a daylight responsive lighting control system with respect to manual control is also considered. As a first step, the analysis is carried out for the climatic conditions of Turin, Italy (latitude: 45° north).
The software DAYSIM, which allows calculating daylighting availability and its integration with electric lighting through a dynamic climate-based annual simulation, was used for the purpose. Daylighting and energy demand were first calculated for a single office room; simulations were repeated changing the different building features. During a second phase, a number of simplified sample office buildings were considered: these were obtained by putting together some of the north-facing and south- facing single rooms which were simulated individually. The Lighting Energy Numerical Indicator value (LENI) was finally calculated for the sample buildings.
The results obtained in the study are intended to provide architects and designers with more detailed information about the consequences on daylighting and energy demand for electric lighting due to different architectural solutions, as well as, the other way around, with strategies to guarantee a desired energy and/or environmental performance. Results are hence expressed in terms of: comparison between the lighting energy demand for a manual and for a daylight-responsive control system; correlation of the energy demand to a daylight factor criterion; percent variation of energy demand as building features vary (room depth, WWR, obstruction angles),
highlighting for which combination a manual or a daylight responsive control system is worthwhile
Daylighting simulations in sky scanning simulators: application to buildings with repetitive bays
No full textEnergy Saving Generated Through Automatic Lighting Control Systems According to the Estimation Method of the Standard EN 15193-1
Get PDFThe standard EN 15193-1:2017 “Energy performance of buildings - Energy requirements for lighting” introduced a detailed method to calculate the energy demand for lighting in buildings. The method contains a calculation of the daylight supply, which accounts for the impact of lighting control systems, both daylight-linked and occupancy-based. This paper presents the results of a study carried out to quantify, with respect to a manual on/off switch, the energy savings due to the four typologies of daylight-linked controls included in the standards, as well as their combination with an occupancy auto off control. To highlight the factors that affect the amount of saved electric energy, several spaces were considered, with different daylight availability, windows orientation and shading system, located in sites at different latitudes and climate conditions, and considering two types of building: offices and classrooms. A database of 2880 cases was built. As a second step of the study, for each site and type of control, the minimum window-to-wall ratio necessary to obtain a pre-defined saving was calculated. The results show for what combinations of variables two target savings of 20% and of 30% can be reached using the photodimming and occupancy controls contained in the standard
La progettazione della luce naturale mediante l'uso di modelli in scala in cielo artificiale: esempi di applicazioni
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