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EN
Cross-dating of bricks and mortars from historical building, through thermal (TL) and optically stimulated (OSL) luminescence have achieved good accuracy and precision. However this approach is, in many cases, not exhaustive especially for buildings with different construction phases closely temporally spaced to each other. The uncertainties of experimental data added to the reuse of old bricks and/or the presence of mortars applied on restorations represent the main limits to obtain the complete chronology. In the case of the Convento de S. Francisco (Coimbra, Portugal), the dating results were crossed with the stratigraphic study of the building, mineralogical characterization by XRD and colorimetric data of the mortar samples. Thanks to luminescence ages, mineralogical composition and color specification, two phases of construction were identified: the first from the 17th century and the first half of the 18th century and the second from the second half of the 18th century to the first half of the 19th century. These results were confirmed by mineralogical characterization and colorimetric measurements of mortars that identify two different types of materials in aggregate/binder ratio terms and superficial optical characteristics.
EN
The article aims to evaluate the Portuguese building stock energy policies and strategy for energy saving in buildings among the EU members. It was found out the average heat transfer coefficients of the main structural elements of Portuguese Buildings and analyzed the U-values of this elements considering different time periods. The fundamentals of this study were funded by the Agency for Development and Innovation (ADI) and co-financed by the European Regional Development Fund (FEDER) through the Operational Program for Competitiveness Factors (POFC) assigned to the Building Physics and Construction Technology Laboratory with the reference SB Tool SPT_2011_4.
EN
Independent Subspace Analysis (ISA) consists in separating sets (subspaces) of dependent sources, with different sets being independent of each other. While a few algorithms have been proposed to solve this problem, they are all completely general in the sense that they do not make any assumptions on the intra-subspace dependency. In this paper, we address the ISA problem in the specific context of Separation of Synchronous Sources (SSS), i.e., we aim to solve the ISA problem when the intra-subspace dependency is known to be perfect phase synchrony between all sources in that subspace. We compare multiple algorithmic solutions for this problem, by analyzing their performance on an MEG-like dataset.
4
Content available remote Energy of efficiency for typical 2-floor buildings in Portugal
EN
The purpose of this paper is to develop a relative evaluation, from the energetic point of view, of different building layouts. Buildings can be classified, according to their position within the lot, as perimeter yard buildings, rear yard buildings, and side yard buildings. This classification covers the layout solutions traditionally adopted by architects for 2-floor residential buildings. The thermal performance of each building layout was evaluated through the quantification of its energetic consumption (per square meter of built area), for the heating and cooling seasons, and according to the geographic orientation. The simulation tool used in this evaluation is based on the Transfer Function Method. The results obtained showed that the rear yard buildings have the better thermal performance, with an average energy consumption that is around 40addition, for all building layouts studied, the North-South orientation requires the minimum energetic consumption to maintain comfortable indoor air temperature.
PL
Zadaniem pracy jest stworzenie porównawczej oceny — z punktu widzenia energetyki — różnych rodzajów rozplanowania budynków. Zależnie od ich usytuowania na działce, budynki można podzielić na wolnostojące, szeregowe i bliźniaki. Taki podział pokrywa wszystkie moźliwości rozwiązań usytuowania przyjmowane tradycyjnie przez architektów dla dwukondygnacyjnych budynków mieszkalnych. Wydajność termiczna każdego rozplanowania budynków została oceniona przez kwantyfikację zużycia energii (na m2 zabudowy) w sezonach grzewczym i chłodniczym oraz w zależności od kierunku ustawienia względem stron świata. Narzędzie symulacji zastosowane do tej oceny jest oparte na Metodzie Funkcji Przeniesienia. Otrzymane wyniki pokazują, że budynki szeregowe mają lepszą wydajność termiczną przy zużyciu energii mniejszym o 40% od pozostałych przypadków. Ponadto, dla wszystkich rozpatrywanych rozplanowań kierunek ustawienia północ-południe wymaga najmniej zużycia energii dla zapewnienia komfortowej temperatury wnętrz.
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