Search results for " U-value"
showing 4 items of 4 documents
Integrating thermal and mechanical characteristics of historic masonry categories: Development of a Sicilian database
2021
Detailed construction analysis is essential to the compatible energy improvement of historic buildings. In-situ measurements are crucial for energy diagnosis but their use is limited, especially in vernacular architecture. This paper exposes the development of a hygrothermal and mechanical database for Sicilian historic walls. The proposed method, applied to eleven historic centres, is based on the investigation of those masonry construction features, which recur in local contexts. Preliminary results concern the case study of Petralia Sottana, where a first set of laboratory measurements of stone compressive strength and thermal conductivity was conducted, together with in-situ tests of ma…
Software for the heat flow evaluation of the nearly-zero houses
2015
The windows in a building are the weakest part for energy saving and reduced consumption. In particular, the choice of window frames and glazing systems directly influences the amount of heat loss through a houses envelope. The paper will show the results of a work developed by PADesign srl company (Accademic Spin off of the Università degli Studi di Palermo). This is a software tool that allows a rapid comparison about the windows thermal performances, by calculating the global thermal transmittance and by showing the trend of the heat flow. The tool has a simple graphical interface that allows the users to select the climate data, the window typologies, the geometric features and the mate…
Approccio integrato per la caratterizzazione delle murature storiche siciliane. Il caso di Gangi
2022
This study is part of a research aimed at developing a database of mechanical and hygrothermal information for Sicilian historic walls. This database is intended to support the analysis of the envelope performances of the historic building and to integrate data collected through in-situ measurements. The method is based on the analysis of local contexts: stone walls are divided in typologies according to the detailed non-destructive examination of the historic building stock, and laboratory and in-situ tests are carried out to characterize the mechanical and thermophysical properties of walls and masonry materials. This study focuses on the local context of Gangi, where a large amount of hi…
Contributo alla conoscenza delle proprietà termofisiche delle murature storiche palermitane
2014
This paper presents the preliminary findings of in situ measurements of thermal transmittance taken in a monumental complex in Palermo. The objective of energy efficiency, one of the main aspects of sustainable construction, is now relevant also for historic architecture. The research aims at analysing the energy performance of the stone walls of the complex, characterized by various thickness, age and construction features. Measurements are taken in accordance with the international standard ISO 9869:1994. The U-values so obtained are compared with tabular data from the Italian standard UNI/TS 11300-1:2008 and with values calculated following the UNI EN ISO 6946:2008. Nine preliminary meas…