UPVC windows and doors are plastic-steel doors and windows made of polyvinyl chloride (PVC) resin as the main raw material and additives. It has obvious performance advantages in terms of energy saving and environmental protection. The door and window industry conforms to the development trend of green and environmentally friendly buildings in the future, and UPVC doors and windows (commonly known as plastic steel doors and windows) will be the best choice. This article focuses on the performance advantages of UPVC doors and windows in green and environmentally friendly building applications from four aspects: thermal insulation performance, sound insulation performance, mildew and condensation, and smog reduction, so as to provide reference for people’s selection of doors and windows
Among today’s three major social energy consumption, building energy consumption accounts for more than 40% of the total energy consumption, and building doors and windows are the weakest parts of building thermal insulation performance, especially in ordinary buildings, although the area of doors and windows only accounts for the area of the outer protective structure 20% to 30% of the energy consumption of the building envelope, but the long-term energy consumption of doors and windows accounts for 50% of the energy consumption of the building envelope and 25% of the total energy consumption of the building.” According to incomplete statistics, the existing buildings in China have exceeded 50 billion m2, More than 90% of them are buildings with high energy consumption, and the energy consumption of doors and windows is 2 to 3 times that of developed countries. China’s annual coal production accounts for about 20%. Therefore, it is an inevitable requirement for the future development of the door and window industry to vigorously develop energy-saving and environment-friendly doors and windows.
1.UPVC WINDOWS ADN DOORS- Excellent environmental performance
With the increasingly stringent national energy-saving standards, Beijing, Tianjin, Hebei and other regions have taken the lead in increasing the building energy-saving design standards from 65% energy-saving to 75% and 80% energy-saving. Beijing will reduce the heat transfer coefficient requirements of doors and windows from the original (1.5 ~ 2.0W/m’ K to 1.1W/m K2, and Tianjin and other regions will also significantly reduce the K value requirements of doors and windows. Therefore, while ensuring reasonable comfort Under such circumstances, the heat transfer performance of doors and windows should be reduced as much as possible to reduce energy loss, thereby reducing building energy consumption and saving energy.
For the material selection of energy-saving doors and windows, in addition to continuously improving the thermal insulation requirements for glass, the window frame materials that account for 30% or more of the door and window area are also particularly important. As an important energy-saving door and window, UPVC doors and windows have good thermal insulation performance and are becoming more and more More and more recognized by the industry. The main factors affecting the thermal insulation performance of window frames include two aspects: First, the thermal conductivity of UPVC profiles is relatively low. UPVC is a non-metallic polymer material. The material itself is a poor conductor of heat, and its thermal conductivity is 0.17W/m K3, while the thermal conductivity of metal materials is much higher than that of UPVC. The second is that UPVC profiles have a multi-cavity thermal insulation structure. The production process adopted by it can realize multi-cavity thermal insulation structures through different molds, as well as reinforced structures and drainage structures with different functions, which can meet various hardware installations and watertightness of doors and windows. Airtight and other unique designs. Compared with the processing and production of metal profiles, it is much more difficult. Generally, a single metal profile can only process 2~3 simple cavities, and it is difficult to produce multi-cavity and complex structures. In addition, after the UPVC profile is made into a cavity structure, the thermal insulation performance of the window frame profile is optimized again compared to the material itself.
2.UPVC WINDOWS ADN DOORS-Good sound insulation and noise reduction function
In order to improve the comfort of the indoor environment and meet people’s needs for a high-quality life, in addition to providing a balanced indoor air temperature with thermal insulation doors and windows, there should be a good acoustic environment in the room, that is, the doors and windows should have enough isolation from outdoor noise to enter the room. Ability. UPVC doors and windows have high sound insulation performance, thanks to the properties of the material itself. According to the principle of material sound absorption, when a sound wave encounters a wall or other obstacle, part of the sound energy is reflected, part of the sound energy is absorbed by the wall or obstacle and converted into heat energy, and a small part of the sound energy is transmitted to the other side. The sound absorption coefficient reflects the sound absorption capacity of a certain material or structure. The sound absorption coefficient of the material is generally between 0 and 1. The greater the sound absorption coefficient, the better the sound absorption performance of the material. Generally, materials with an average sound absorption coefficient greater than or equal to 0.2 are called sound-absorbing materials. Materials with an average sound absorption coefficient greater than 0.5 are ideal sound-absorbing materials. The sound absorption coefficient of UPVC material is greater than 0.2 at most frequencies, especially at the frequency of 2.2k ~ 3.0kHz. The sound absorption coefficient of UPVC material is about 20 times that of metal materials such as aluminum alloy.
UPVC door and window profiles rely on their relatively strong sound absorption characteristics and can be made into a multi-layer cavity structure. The noise sound wave is emitted and absorbed every time it passes through a layer of cavity wall. After layer-by-layer reflection and absorption, it reaches the indoor noise. There is not much left. Therefore, UPVC doors and windows can well isolate outdoor noise pollution, and the effect of sound insulation and noise reduction is good.
3.UPVC WINDOWS ADN DOORS-Prevent mildew and condensation
Doors and windows, as the weak link of thermal insulation in the external enclosure structure, are most likely to form heat transfer channels (commonly known as thermal bridges or cold bridges) at the frame and corners. In autumn and winter when the temperature is low, the local temperature of this part will be lower than that of other structures, and the air temperature in this area will also decrease accordingly. At the same time, the relative humidity of the air will increase. When the temperature drops to a certain temperature, the relative humidity will decrease. Increased to 80%, at this time the mold began to reproduce in large numbers, so that the number of mold spores in the air increased sharply, resulting in a decline in air quality, causing colds, allergies and other diseases. When the temperature continues to drop and the air humidity further increases, reaching above 99%, condensed water begins to form at the cold bridge, commonly known as condensation. Condensation can damage walls, causing dampness and further mildew.
For daily air quality, if the temperature of the window frame, glass and surrounding walls is higher than about 13C, mildew can be avoided; when the local temperature is higher than about 10C, condensation can be avoided. For energy-saving and thermal insulation doors and windows, usually the heat transfer coefficient of the entire window needs to reach (1.0 ~ 2.0) W/m·K. While the overall window heat transfer coefficient needs to be at this level, the balance of the window’s glass and frame heat transfer coefficients is equally important. If the heat transfer coefficient of the frame material is high, the use of glass with a lower heat transfer coefficient will lower the heat transfer coefficient of the entire window, and local thermal bridges at the window frame cannot be avoided, resulting in mildew and condensation. The internal design of UPVC profiles optimizes the temperature distribution, avoids condensation and mildew, and is conducive to improving indoor air quality.
4.UPVC WINDOWS ADN DOORS-reduce smog
In recent years, smog has occurred frequently, seriously affecting people’s lives, and PM2.5 is the main cause of smog and one of the important indicators of smog. It mainly comes from the residues discharged through combustion in the processes of daily power generation, industrial production, and automobile exhaust emissions, and most of them contain toxic substances such as heavy metals. For a long time, China’s energy consumption structure has been dominated by coal. In the proportion of energy structure, coal consumption accounts for about 70%, far exceeding the world’s average level of 30%. In 2013, my country’s coal consumption has exceeded The sum of coal consumption in other countries in the world, so in China, upvc doors and windows are highly advocated. Whether you are an individual or a business, we recommend that you take a look at the upvc casement window of our factory.
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