Energy Efficiency and Minimum Environmental Criteria

CAM, Minimum Environmental Criteria for public building notices, requires in section 2.3.2 the verification of the “Summer Operating Temperature” calculated in accordance with UNI 10375 or more accurate calculation methods.

ANIT is developing software for calculating the summer behavior of rooms that can be used for the purpose of meeting these requirements. And it is obvious that Pafile’s THERMO DRY Wood Fiber enables high performance results under conditions of increased thermal stress.

Fortunately, the regulations are increasingly precise and leave room for less misunderstanding.

Previously it was required, “The periodic internal areic thermal capacity (Cip) referring to each individual opaque structure of the external envelope, calculated according to UNI EN ISO 13786:2008, must have a value of at least 40 kJ/m2K.”

Now the following must be achieved: “adequate thermal comfort conditions in indoor environments, through a design that provides for a periodic internal areic thermal capacity (Cip) referred to each individual opaque structure of the external envelope, calculated according to UNI EN ISO 13786:2008, of at least 40 kJ/m 2K or by calculating the summer operating temperature and the deviation in absolute value evaluated in accordance with UNI EN 15251.”

Regarding envelope performance, the requirements for the year 2021 are no longer required to be met, but those for the year 2019, and reference is made to public buildings.

Another very important point emphasized is that: “The transmittance values in the previous tables are considered not to include the effect of thermal bridges.”

With respect to interior or cavity insulation interventions, the following alternative is added: “or alternatively, the summer operating temperature should be calculated in accordance with UNI 10375 and the deviation in absolute value evaluated in accordance with UNI EN 15251 with respect to a reference temperature.”

for verification is additionally required:
“The summer operating temperature (θo,t) is calculated according to the procedure described in UNI 10375, with reference to the hottest day of the summer season (according to UNI 10349 part 2) and for the environment of the building intended for the permanence of people considered most unfavorable. The deviation in absolute value (∆Ti), which corresponds to the minimum comfort level to be guaranteed in the most unfavorable environment, is evaluated with the following formula:

Alternatively, the above parameters can be evaluated by more accurate calculation methods.”

In this sense, municipal building codes are proving to be an excellent key to tell the story of the evolution toward sustainable building to which Pafile’s THERMO DRY fiber contributes. And at the same time to provide valuable tools to accompany the ongoing innovation, such as for proper design and energy-efficient buildings.

A strategy for upgrading the existing building stock is also indispensable, providing certainty for the 65 percent IRPEF deductions that could end a in the next few years and linking incentives to the results achieved in terms of reducing energy consumption, thus concretely helping households.

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