ZEMCH 2015 - International Conference Proceedings | Page 711

cerned , the original ones were to be replaced with new thermally insulated ones , respecting the existing window sizes in keeping with the facade ’ s enclosed and empty space rapport . The plastered walls compared to the previous grit-blasted ones no longer result in a facade dominated by horizontal stripes , which made the buildings seem much longer ( fig . 4 ). To lessen the complex ’ s compactness , terraces were introduced at different levels , which other than creating a landing to access some apartments , break the linear aspect of the balconied gallery and become places for people to relax or socialize . To understand the energy performance of Building A , a study was carried out using STIMA software which resulted in drawing up a model where , for each environment , the elements of the existing closures , walls and floors , and the relevant trasmittance value , were included to obtain an energy performance assessment for the whole construction .
Figure 5 : Building A today : duplex apartment and transmittance evaluation for external wall and windows
Furthermore , as it is a building with a centralized heating system , the simplex apartments were considered as one single large environment while the duplexes were considered as two different environments . The transmittance values were compared with the ministerial decree of 26 November 2010 published in Official Gazette n . 35 , 12 / 02 / 20106 concerning building energy requalification , updated from the ministerial decree of 11 March 2008 ( amendment of legislative decree n . 192 , 19 August 2005 ). Instead , for the total building calculation and the relevant energy certificate , the UNITS11300 ( the recommendation of the Comitato Termotecnico Italiano regarding building energy certification ) was used . The checks were carried out taking into account the present exterior walls , made of an 8 cm reinforced concrete panel , a 14 cm air cavity , a layer of 8 cm perforated plaster and of plaster board , where , as can be seen in the Glaser diagram , no condensation occurs between the layers . The calculation of the transmittance , instead , highlighted the problem of thermal dispersion being u = 0.518 w / m ² k more than the minimum values forecasted by law ( 0.29 w / m ² k ). In the covering floor , the Glaser diagram highlights the formation of condensation inside the damp-proofing and this would require adding a vapour barrier before insulating to avoid the damaging effects of condensation . In this case , the transmittance value ( u = 0.492 w / m ² k ) is much higher than the values forecasted by law ( 0.26 w / m ² k ).
Energy retrofit for Rome municipality ’ s residential real estate ( ATER ) 709