Abstract
This work is part of a major investigation the authors are undertaking aiming to evaluate the energy performance of different retrofitting strategies for housing buildings, in order to establish preferential criteria of intervention according to its climate zone location, morphology, constructive features and patrimonial values. In the historic centre of Oporto, one of the major actions resides on a significant reduction in the heating loads of these distinctive buildings by decreasing the windows infiltration rate. To be able to accurate this potential for energy savings, in situ measurements of the infiltration rate of this houses at present were required, previous to a possible intervention. This article presents the data obtained using a fan pressurization method in two non-refurbished characteristic buildings of the Oporto’s Historic Centre, and analyses the results obtained for both a typical sash window and a casement window. Some relations between these infiltration rates and the buildings morphological and typological characteristics are considered.
Highlights
AND OBJECTIVESEnergy efficiency is nowadays one of the major guidelines for all the construction interventions (1) (2)
Considering that in Oporto the cooling demand is generally 10% of the heating demand, SRU (4) defends that ventilation has a major impact in buildings heating demand and that the renewal of the interior air may be responsible for 30% to 50% of the total energy needs in the heating season, which leads to the need to minimize the flow rates to reduce energy consumption
The data obtained in the experiments was incorporated into a Microsoft Excel spread sheet in order to analyse them in conjunction with the morphological characteristics of each room and window studied (Table 4)
Summary
AND OBJECTIVESEnergy efficiency is nowadays one of the major guidelines for all the construction interventions (1) (2). When dealing with retrofitting of historic buildings one must try to join this concept with the buildings morphology, its constructive characteristics and its patrimonial values such as traditional building materials and techniques that should be preserved. Considering that in Oporto the cooling demand is generally 10% of the heating demand, SRU (4) defends that ventilation has a major impact in buildings heating demand and that the renewal of the interior air may be responsible for 30% to 50% of the total energy needs in the heating season, which leads to the need to minimize the flow rates to reduce energy consumption
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