Let's talk about aluminium

Aluminium is a very common element in nature and is available in the form of oxides of aluminium (bauxite). The bauxite reserves are currently guaranteed for hundreds of years, but today about a third of the aluminium used is made from recycled aluminium objects. Aluminium is a clean material, highly sustainable from the ecological point of view, thanks to the reduced amount of energy needed to work it, and to the infinite recycling options. It is oxidation and wear resistant, and allows a variety of colours to ensure architectural versatility as well as the highest functionality and lightness.

 

In the case of profiles for the construction of door and window frames, the aluminum is in the form of alloys with other chemical elements such as magnesium, silicon, manganese, zinc, copper etc .. which strongly improves the mechanical properties of hardness, workability, resistance etc.

Thermal insulation

Aluminium is a high thermal conductivity metal. When the outdoor temperature is many degrees lower than the one that is present in a room, aluminium gives rise to a heat flow, thus contributing to the transfer of heat from the internal environment to the external one. This effect is called thermal bridge. The higher the temperature difference between the two environments, the larger the amount and the higher the speed of the heat being transferred per unit of time to the external environment. This means that a part of the heat generated by our heating or cooling system will be lost.

In order to reduce the bridge effect, two aluminium profiles are mechanically united by two polyamide bars interrupting the continuity of the aluminium structure. This solution is known as thermal break, since the thermal conduction is interrupted, “broken” from this heat-insulating material. Thermal insulation has no seasons, so if in winter we have less heat dispersion outwards, in summer we have less dispersion of internal cooling outwards.

In a thermal break frame, glass becomes a significant component.

The aluminium thermal break systems achieve the best results in terms of thermal insulation in combination with high-performance glazing. The thermal performance of the glass increases if argon is introduced into the glass chamber, which decreases the transport of warm air outwards, and if on the inner sheet a low-emissivity film is applied, which increases the sealing performance. The glass chamber must always contain salts that absorb the humidity inside the chamber itself, thus avoiding the condensation formation. The edge of the glass is completely sealed with hot glue.

The low-emissivity glazing in winter prevents heat from escaping. It is usually installed in the frames lying in the north, on the colder side of the house. It is not suitable for blocking the sunlight; in this case you should use selective glass, which retains heat in winter and reflects it in summer, thus preventing direct sunlight, but also reducing summer air conditioning costs. This is usually installed in frames lying in the south.