A lot of families have such a feeling, sit by the window in the winter, always feel the cold wind blew in from the window; In summer, near the window and sweltering heat. Actually, this is caused by Windows and doors of cold and heat radiation. And improve the window after the performance, less cold heat radiation, an increase in people living comfort at the same time, virtually also increased building indoor area of effective use.

In addition, the performance good doors and Windows, do not underestimate its energy saving effect. Have data statistics, a set of contains 8 outside the window of the bedroom, if you use the window of the heat insolation, in 20 years, will than ordinary window saves the refrigeration and heating costs 5000 yuan of above; A set contains 100 outside the window of a building, if you use the window of the heat insolation, in 20 years, refrigeration and heating costs than using normal window saved amounted to 60000 yuan of above.

China construction metal structure association of steel and wood doors and Windows commission according to the survey, the current consumer demand for Windows and doors the functionalization of already more and more obvious, adapted to different climatic conditions, different regions, different functions on the system of Windows and doors will have huge market space.

Building energy efficiency, Windows and doors is the key

"Every family with doors and Windows, however, few people are willing to pay close attention to, think the doors and Windows are only tools of rain, don't know the role of the doors and Windows in the building energy conservation." Pan, director of the China construction metal structure association of steel and wood doors and Windows committee champion, points out that in three of the whole society of energy consumption, building energy consumption accounts for over 40% of the total energy consumption in the whole society, and building loss through doors and Windows account for nearly half of the total energy consumption of building energy consumption.

"Building energy efficiency, Windows and doors is the key. But for a long time, due to the social cognitive problems, the important energy saving fields, has long been ignored, marginalized." Pan Guanjun says, reduce indoor heat loss in winter, summer block outdoor to indoor heat conduction, maintain indoor cooling effect, the door to play a key role.

According to nine is building materials is understood, compared with the developed countries, energy-saving doors and Windows industry in China is still in its infancy. At present, the developed countries use the percentage of high-performance energy-saving Windows and doors had 70% of the total of doors and Windows, and in our country, high-performance systems Windows only accounted for 0.5% of total doors and Windows. On the basis of the domestic existing buildings housing area of 43 billion square meters, calculate by Windows account for 25% of the construction area of meter, about 11 billion square meters of the doors and Windows, if the energy level to achieve the current European standard, will save BiaoMei 420 million tons a year, equivalent to 20% of the total in coal production.

China construction metal structure association committee of steel wood doors and Windows, according to the data provided by the present domestic Windows and doors manufacturer for more than 1 m, plastic doors and Windows processing capacity of 700 million square meters, are in more than 450 million square meters, accounting for more than 50% of all kinds of building Windows and doors. At the same time, the annual output of 8.4 million tons of glass (about 600 million square meters), including energy saving coated glass 640000 tons (about 43 million square meters), accounting for 7.6%; With an annual output of 360000 tons of hollow glass (24 million square meters), accounted for 4.3%, generally low proportion.

Earlier this year, Beijing began to implement new standard DB11/891-2012 "residential building energy saving design standard", in "the palisade structure heat transfer coefficient K limit", external window, balcony door (window) K values to make the rules --

3 the following construction:

North: M1 (window wall area ratio) of 0.2 or less, K value of 1.8 or less; M1 > 0.2, the K value of 1.5 or less;

To the east, and west: M1 0.25 or less, K value of 1.8 or less; M1 > 0.25; K value of 1.5 or less;

South: M1 0.4 or less, K value of 1.8 or less; M1 > 0.4, the K value of 1.5 or less;

More than three layer architecture:

North: M1 0.2 or less, K value of 2.0 or less; M1 > 0.2, the K value of 1.8 or less;

To the east, and west: M1 0.25 or less, K value of 2.0 or less; M1 > 0.25; K value of 1.8 or less;

South: M1 0.4 or less, K value of 2.0 or less; M1 > 0.4, K value of 1.8 or less.

Industry insiders said the Beijing took the lead in the country to take 75% of building energy saving measures, the doors and Windows have very positive to push the development of the industry, promote the role. Doors and Windows products in our country overall energy saving indexes with the international developed countries there is a big gap, doors and Windows enterprise should take Beijing building energy-saving new standard as an opportunity to make doors and Windows energy saving technology upgrades.

To breakthrough development bottleneck

From countries that have introduced the "twelfth five-year" energy conservation planning, lead to Beijing put forward to realize the doors and Windows K value and relevant local standards, it can be seen that the domestic energy saving consciousness gradually improve. But with the development of green building industry chain link in any other industry, energy-saving Windows and doors industry also need to precipitate out of its energy saving effect. Pan Guanjun, said to some problems existed in the Windows and doors industry, is vital for industry development in the future --

In building energy-saving door window is not green, a lot of doors and Windows can play a role of energy saving, but the doors and Windows material production of high energy consumption, high consumption, high pollution. Such as the familiar broken bridge aluminum alloy, low-e glass, etc., on the material selection is not green. Comparing the performance of the same broken bridge aluminum alloy profiles and co-extrusion profiles, stamped with a dosage of unit area of broken bridge aluminum alloy window 2 3 times higher than the co-extrusion for aluminium window and unit area production energy consumption is aluminous model co-extrusion window of 1.3 times; And energy-saving glass coating process in the process of production consumes a lot of water, electricity, emissions of industrial dust, etc.

Green doors and Windows energy saving, green doors and Windows material production process saving energy and reducing consumption, but the energy saving effect is poorer. Such as single-layer glass plastic window, there is no emphasis on comprehensive performance, including the green material, green glass, window of the whole climate adaptability.

Green energy-saving door window is not safe, can not deny the fact that some companies due to factors such as technology, cost, production of energy-saving doors and Windows of low strength, large deformation, the problem of poor durability, cannot be used in high-rise buildings.

Pan Guanjun says, composite doors and Windows will become the mainstream of green energy-saving Windows and doors. And one of the main technology used in composite doors and Windows is a composite co-extrusion profiles technology, this technology can maximize meet green, energy saving, safety performance requirements. Therefore, the current co-extrusion profiles for aluminium window, gradually replace broken bridge aluminum window, fully replace the traditional plastic window, model steel window is a kind of inevitable trend. In addition, composite glass manufacturing technique can adapt to seasonal variation, diurnal variation, sunshade pervious to light performance can be adjusted, is one of the technology development trend of the future energy saving doors and Windows.