Evaluating non-intrusive energy retrofits for the built heritage of historic centre of Oporto
Traditional building materials and techniques should be preserved when selecting retrofit strategies. The most recurrent energy retrofit strategies proposed for the historic centre of Oporto are mainly fo-cused on achieving, or even overlapping, the reference U-values established for the external en...
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| Format: | article |
| Status: | Published version |
| Publication Date: | 2017 |
| Country: | España |
| Institution: | Universidad de Sevilla (US) |
| Repository: | idUS. Depósito de Investigación de la Universidad de Sevilla |
| OAI Identifier: | oai:idus.us.es:11441/97578 |
| Online Access: | https://hdl.handle.net/11441/97578 https://doi.org/10.2495 |
| Access Level: | Open access |
| Keyword: | energy efficiency glazing heritage buildings historic centres retrofitting ventilation |
| Summary: | Traditional building materials and techniques should be preserved when selecting retrofit strategies. The most recurrent energy retrofit strategies proposed for the historic centre of Oporto are mainly fo-cused on achieving, or even overlapping, the reference U-values established for the external envelope on national energy regulations, although historic sites are not obliged to comply with it. On the other hand, national cultural heritage preservation policies, by allowing alterations on these historic buildings interior, validate the adding of thermal insulation materials on internal walls. Nevertheless, these inter-ventions may put to risk architectural patrimonial values, hence, sustainable ones. A more opportune intervention could be the enhancement of the windows performance, due to its most common bad state of conservation. This article analyses the performance of two non-intrusive retrofit strategies, in a rep-resentative model of these buildings: the enhancement of ventilation and the substitution of the single glazed windows for double glazed ones, and the two combined. On a first approach, using as a reference the heating loads limits established in the energy regulation of 2013 and the normative methodology, it is calculated the corresponding number of hours of daily heating use, in order to stand below these limits. The results obtained showed that this is attainable, in comfortable conditions of heating use. In order to achieve more accurate results and conclusions a dynamic simulation was performed using energy models, for the heating and cooling season. The enhancement of ventilation proved to be the most effective retrofit strategy. |
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