Solar shields, what are they here what are sunscreens and how they are classified, the benefits linked to energy saving and the economic incentives available.
Thesolar shieldsare structures designed to protect the home from sunlight, a simple but effective solution to save energy in your home. Thesolar shieldsare born to strengthen the role of windows, a weak link when it comes toinsulation of buildings.
A system ofsolar shadingeffective could be crucial for maximizing thermal gains in winter and cooling in summer, especially in homes with large windows. Another key point, thesolar shieldsthey must ensure maximum visual comfort by letting natural light penetrate according to the needs of the inhabitants.
On the market there are different types ofsolar shieldswith a different effectiveness. The effectiveness ofsolar shieldsit does not depend only on the composition materials but also on the implementation of the installation, the position of the glass surfaces and the local climate. However, it is crucial that the material used for theshielding(as well as its color) has specific values of transmittance, reflectance and absorbance.
Transmittance, reflectance and absorbency, what do these terms mean?
The transmittance indicates the fraction of light incident at a given wavelength that passes through a sample, therefore the light that manages to penetrate through the window. We have already dealt with the concept of transmittance in green building but that time we did it referring to thermal energy talking about insulating materials (thermal transmittance). Broadly speaking, the concept is almost the same but with thesolar shieldswe do not speak of heat but of transmitted light intensity.
It is the relationship between lighting and illuminance. Reflectance indicates the proportion of incident light that a given surface is able to reflect. In other words, it indicates the light that once it reaches our surface is reflected so it does not illuminate the internal environments.
Absorbance is defined as the logarithm of the inverse of the transmittance; in other words, it is the light absorbed by the shielding that is neither transmitted inside the building nor reflected outside.
Returning to thesolar shading, its effectiveness depends on these three properties but also on the type ofshielding, if fixed or mobile, by the type of position of the screen with respect to the window frame (so if it is asolar shadinginternal, external or integrated into the frame) and again, from the position of the screen with respect to the facade: if placed in parallel, if placed orthogonally, horizontally or vertically. The position of thesolar shadingwith respect to the facade, it must be chosen according to the circumstances (position and type of windows to be shielded).
All these features just mentioned must be taken care of in the smallest details to optimize the energy performance of the building.
A goodsolar shadingit must take into account a large number of factors and correlate them to the desired effects of the end user without forgetting that needs change according to seasonality!
- Light radiation
- Thermal radiation
- Protection from sun and rain
- Resistance to atmospheric agents
Those who intend to make use of solar shading to improve the energy efficiency of an existing building or property, can take advantage of the economic incentives made available with theThermal Accountor fromTax deductionsprolonged with the decreeSave Italy.All information is available in the article dedicated toDiscounts for energy saving.
Another related article of ours that might interest you is: Solar shields: deductions.