THE ENERGY INTENSITY AS A NEW PARAMETER FOR THE VALUE PERFORMANCE OF THE ENVELOPE OF BUILDING STOCK

In the general context of the impact evaluation of the building sector on the environmental systems, the energy parameter represents a fundamental factor for the inquiry a necessary indicator to give a quantitative evaluation to the environmental compatibility of a building technical system. In this studies, the research are focalized on the building envelope, in particular the value of the “energy intensity” used in the production of materials and components. The objectives derive from the necessity to define a methodology of intervention in this ambit and to associate it to systems that, since the production phase, have an energy behaviour in line with the necessity to guarantee interventions with low environmental impact. In addition, the choice of the technical solution to adopt in the actions on existing building, takes in consideration the “new” parameter of the energy intensity in production phase. The existing building stock already embodies a certain quantity of energy, defined as “latent energy”. Such energy store should not undergo excessive increase in consequence of over-dimensioned actions for energy requalification.