Bio Building

Energy certification of buildings: how reliable is it?

With IR thermography the quality of the thermal insulation of a building is verified

There energy certification of buildings was born to allow people to be sure of energy quality in terms of consumption of the property they purchase. The theoretical mechanism is similar to that of the energy certification of household appliances, where a clearly visible label on the casing should let you know how much electricity the washing machine, refrigerator, dishwasher, etc. consume. The properties on the market today are equipped with energy label which certifies the quality from the point of view of consumption.

L'energy efficiency of a building, however, does not depend only on the quality of the summer heating and air conditioning systems, but also and above all onenvelope insulation: well insulated walls and roof make it possible to reduce heat loss and optimize the operation of the systems themselves. This triggers an additional reasoning: insulation and energy saving do not always coincide with healthiness and housing well-being. A quality house is not only one that consumes little, but one in which the insulation has been created with healthy materials and techniques aimed at living comfort.

Apart from the discourse on living comfort, the certification of energy efficiency it is valid only if it is reliable: that is, if what is stated in the table by the seller is true. From this point of view there is some problem.

Speaking atProgrammatic Assembly on Efficiency and Energy Saving of States General of the Green Economy which took place on July 12 in Milan, Alessandro Picchiolutto, an expert in energy management, said: "We have an energy certification mechanism in Italy that is dangerously drifting towardsunreliability. There energy certification, created to allow people to be sure of what they buy, is a winning concept only if it involves the quality of the entire supply chain, starting with the service providers, that is, the certifiers. The problem - he added - is the lack of standardization of the process: a standard product is reliable because it is based on a control of the supply chain, but where is the benefit? "

Italy is actually the only country in Europe that with Legislative Decree 115/2008 has activated a supply chain qualification mechanism that leads to the energy certification of buildings, the problem is that this mechanism is not implemented. The engineer Cesare Maria Joppolo of the Energy Department of the Politecnico di Milano, intervened by the public with an intervention on the subject that concluded with this sentence: "An energy certificate that is sold for little money and without any control, what is its value?"

From the consumer's point of view, i energy certificates they must be carefully evaluated and checked when buying a property, verifying that they are not simple pieces of paper drawn up on the basis of theoretical calculations, sometimes not even so precise. There are also tools, such as the IR thermography, which allow to evaluate the insulation quality of the envelope and the existence of any thermal bridges which can cause dispersion, infiltration and mold formation.

Video: Energy Efficient - The secret for saving energy and building an energy efficient home (October 2020).