4/2/2023 0 Comments Solar screens for windowsIf aerogel were used to fill air gaps between glass panes, the consequent benefits would be represented by lower solar heat gain coefficient, as glazing containing aerogel is translucent and lower values of glazing thermal transmittance ( U g) would be obtained. Aerogel for Super-InsulationĪerogel can be used in windows in various ways, as reported in the literature. The gel is generally made by means of low temperature sol–gel technique. The name itself, aerogel, indicates a precise property of the material, namely, the substitution of the liquid component of the gel with a gas. For these reasons, interest in a nanostructured porous material called aerogel has been growing in recent years. The main evaluation parameters in the choice of an innovative insulating material are undoubtedly the thermal conductivity, but also volume and cost. This challenge can be taken up by some materials, defined as super-insulators, characterized by a relatively lower thermal conductivity compared with the typical insulating materials used in building envelopes. One of the possible approaches, especially in countries with a more rigid climate, is to find new devices to increase the standards of insulation of buildings. To do this, in the EU and worldwide, the priority is to enhance energy efficiency by deploying low-cost renewable energies and innovative technologies, especially deriving from recent achievements in the field of nanomaterials research, with reference to building integration of novel technologies, spanning from chromogenics to semi-transparent photovoltaics, super-insulating materials, and phase change materials. The 2015 Paris Agreement on climate change, following the United Nations Conference on Climate Change (COP21), required the subscribing States to reduce carbon emissions in the building stock. The latest European Directive 2018/844 reports that the building stock contributes to 36% of greenhouse gas emissions, considering that almost 50% of the Union’s final energy consumption is used for heating and cooling, and 80% of this amount is employed in buildings. For this reason, the control of energy consumption of buildings is a pivotal challenge. Awareness of the anthropogenic effects on the environment dramatically has increased in recent years, especially in terms of global warming and uncontrolled greenhouse gas production.
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