Technical information

Windowpane

One of the most important factors is the windowpane, which is a thermal-acoustic insulation composed of two or more glass sheets. It saves energy, reduces energy bills, helps improve the environment by reducing Co2 emissions and can still significantly reduce the noise (acoustic attenuation) inside your home giving more comfort to your home. We care about you ...

SOUTH FACADES

The south facing windows benefit from a maximum sun exposure in the winter (low sun). Therefore, it should be sought to increase thermal gains during the cold season.
In summer (high sun), they can be easily protected with the help of a visor (balcony, windlass).

EAST AND WEST FACADES

Glasses with East or West orientation receive maximum energy in Summer, East in the morning and West in the afternoon.
When the sun is low on the horizon, the exposed spans sometimes have a very high temperature (late afternoon). The opening of the windows does not allow to cool the place.

WE RECOMMEND

In matters of energy and climate, we propose to you glasses with high coefficient of protection in double glass version and triple glass.

The Light Transmission (TL)

It is the total amount of visible light that passes through a glass. It is expressed as percentage of light incident on it.

The Uf Coefficient (W / m2.K)

Thermal transmission value of the profiles (Uf)
This represents the heat flow that crosses a m2 of the surface to a temperature difference of 1 degree between the interior and the exterior.

The Coefficient Ug (W / m2.K)

Thermal transmission value of glass (Ug)
This represents the heat flow that crosses a m2 of the surface to a temperature difference of 1 degree between the interior and the exterior.

The Coefficient Uw (W / m2.K)

Thermal transmission of windows (Uw) = Frame (Uf) thermal profiles transmission + Glass thermal transmission (Ug) + Insulating double glass spacer
In order to obtain energy efficient windows, it is essential that they have the lowest heat transfer value (value Uw)
It results from the conjugation of frames with a low thermal transmission value (Uf) with a low thermal transmission value of the glass (Ug).
The coefficient U is the amount of energy in kilo calories that goes through one square meter of glass per hour and for each degree centigrade of difference between both sides of the glass.

The Light Reflection (RL)

It is the total amount of visible light that is reflected by a glass. It is expressed as percentage of light incident on it. Both the TL and RL calculations are considered when the sun is at an angle of 300 over the horizon.

The Energy Reflection (RE)

It is the amount of energy reflected by a glass. It is expressed in the percentage of energy incident on it.

The Solar Factor (g)

It is the total amount of energy that the sun introduces into the building. It consists of the sum of Energy Transmission (TE) plus the part radiated into the interior derived from its absorption (Ai).

                  (Te + ai = g)

The Energy Transmission (TE)

It is the amount of energy that flows directly through a glass. It is expressed in percentage of energy incident thereon.

Energy Absorption (AE)

It is the amount of incident solar energy absorbed by a glass. This absorption by the glass causes an increase of the temperature of the same irradiating to the outside and to the interior, part of that absorbed energy (Ai, Ae). Both the calculation of TE, RE and AE are considered when the sun is at an angle of 300 on the horizon.

Glass is one of the most amazing discoveries of man and its history is full of mysteries. Although historians do not have accurate data on their origin, glass objects have been discovered in Egyptian necropolises, so glass is thought to have been known for at least 4,000 years before the Christian Era. Some authors point to Phoenician navigators as the precursors of the glass industry. The origin would have been casual: preparing a campfire on a beach in the back of Syria to heat their meals, improvised stoves using blocks of saltpeter and soda. After a while, they noticed that a brilliant substance was dripping from the fire and it solidified immediately. The glass would then be discovered which, with its beauty, functionality and multiple applications, would definitely become part of our daily lives.

Development

During the Roman Empire, there was a great development of this activity, with apogee of century XIII, in Venice. After fires provoked by the glass kilns of the time, the glass industry was transferred to Murano, island near Venice. Murano glassworks produced glass in various colors, a milestone in the history of glass, and the fame of its crystals and mirrors endure to this day. France had already made glass since the time of the Romans. But it was not until the end of the eighteenth century that the industry prospered and reached a remarkable degree of perfection. In the middle of this century, the French king Louis XIV gathered some glassmakers and set up the Saint-Gobain Company, one of the oldest companies in the world, today a private company. The modern glass industry has emerged with the industrial revolution and the mechanization of processes. In the 1950s, in England, Pilkington invented the process for producing Float glass, also known as crystal, which revolutionized the technology of this thriving industry.

The float glass process was developed by Pilkington in 1952 and is a worldwide standard for the production of high quality flat glass.

The process, which originally produced only 6mm thick glass, currently produces glass sizes ranging from 1.8mm to 19mm. The raw materials are precisely mixed and melted in the oven. The molten glass, at approximately 1600 ° C, is continuously poured into a chemically controlled liquefied tin tank. It floats on the tin, spreading evenly. The thickness is controlled by the speed of the glass sheet which solidifies as it continues to advance. After annealing (controlled cooling), the process ends with the glass having polished and parallel surfaces.

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Cidade PVC

PVC City, a company specialized in the manufacture of PVC and Aluminum frames, was born in early 2001 and is proud to be among the first in the production of doors and windows in PortugalRead More →

Portugal2020

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Zona Industrial, Lote I 24,2330 - 210 Entroncamento

(+351) 249 820 380

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