PERFORMANCE REQUIREMENTS AND OSCURANT CLOSURE SAFETY
The CE marking of blackout systems (roller shutters, shutters, blinds, etc.) is mandatory as of 01 April 2006.
From the 9 of July 2015 the regulatory update of the product standard that regulates the CE marking of the blackout closures came into force (UNI EN 13569: 2015); the main process related to the steps to be taken for the Marking is substantially unchanged (tests, FPC and supporting documentation) but in detail there are important and important news.
Among the main news it is highlighted:
1) The inclusion of two other relevant services in Annex ZA, which therefore consists of:
a. Wind resistant
b. G tot value definition
c. Additional thermal transmittance ΔR
The modification and integration of the supporting documentation to be supplied to the market, composed of the DoP and the CE Label
Furthermore, from 1 October 2015, according to the inter-ministerial decree, approved on 26 June 2015, "Application of energy performance calculation methods and definition of minimum building requirements ", the limit values of the characteristic parameters are introduced (U and G tot) of building elements in existing buildings subjected to energy upgrading.
The current Stability Law has extended the tax deduction for the whole of 2017 to the extent of 65% for CERTIFIED SOLAR SHIELDS.
This event continues to represent an important step forward for the whole shielding sector which has officially recognized the fundamental role played by the different types of screens for the energy efficiency of buildings and summer energy savings.
RESISTANCE TO WIND
Under the action of the wind, determining a positive or negative pressure, the curtain or the darkening closure must not:
a) suffer a deformation or deterioration that could affect its correct functioning (nominal load Fn);
b) cause a risk to the safety of people (safety load F s)
Both standards also attribute a classification based on the product's ability to withstand, in terms of correct operation and safety, the stresses of the wind to which it is subjected.
P: Represents the wind pressure applied to the darkening closure for which there must be no deformation or deterioration that damages the correct functioning.
P 1.5: Represents the wind pressure applied to the darkening closure for which no deterioration should be observed that could be dangerous for people.
SOLAR SHIELDING SOLAR FACTOR
Attachment F, or the information sheet prepared by ENEA for the purpose of requesting tax deductions, expressly requires the specification of the solar shielding class as defined in the UNI EN 14501 standard, as in relation to the solar factor G tot.
If by solar factor g (or total transmittance of solar energy) is meant the fraction of solar energy that enters an internal environment compared to the solar energy incident on the window (solar factor of the window), the G tot is the solar factor of glazed in combination with the shielding.
Among the various factors that determine the energy efficiency of a solar shield, the G tot is therefore the most important as it characterizes the overall performance, glass + screen.
CALCULATION OF THE G TOT
After determining the transmission and reflection factors (luminous and solar) referring only to the sample in the absence of glazing (following the procedure described in the UNI EN 410 standard and using the spectral distribution shown in table 1 of the same standard), the characteristics are determined of thermal comfort of the shield in combination with the glass window. The characteristics of thermal comfort concern the ability of the darkening closure to maintain, in an environment directly exposed to solar radiation, a more comfortable temperature than that which would be had without the darkening closure (ie with only the window). The thermal comfort characteristics are: the solar factor "g tot", the direct solar transmission factor "te, tot", the secondary heat transfer factor "qi, tot" and the solar shading factor "FC, determined in according to paragraphs 5.2 and 5.3 of the UNI EN 14501 standard, considering the sample in three different installation conditions (outside the window, inside the window, integrated in the window) and in combination with four different reference windows, whose characteristics are shown in Appendix A of the same standard.
In particular, for the calculation of the solar factor "g tot" and of the direct solar transmission factor "te, tot", of the sample in combination with the glazing, reference is made to the UNI EN 13363-1 or UNI EN 13363-2 a depending on the calculation method used, simplified or detailed.
According to the results of the G tot, the UNI EN 14501 identifies 5 performance classes of the solar shielding.
Class 0: g tot ≥ 0, 50
Class 1: 0,35 ≤ g tot < 0,50
Class 2: 0,15 ≤ g tot < 0,35
Class 3: 0,10 ≤ g tot < 0,15
Class 4: g tot < 0,10