Information | Development prospects of China's energy-saving doors and windows industry


Release time:

2015-11-17

Although some areas of our country have begun to formulate energy-saving door and window industry standards, they are quite backward compared with developed countries. At present, the domestic energy-saving doors and windows very high standards of Beijing, K value also has a certain gap with European standards. Among the three major energy consumption in the whole society, building energy consumption accounts for more than 40% of the total energy consumption of the whole society, and the energy consumption of buildings lost through doors and windows accounts for nearly half of the total energy consumption of buildings. Building energy efficiency, doors and windows are the key. But for a long time, due to social cognitive problems, this important energy-saving field has been neglected and marginalized for a long time. Reduce indoor heat loss in winter, block outdoor heat conduction to indoor in summer, maintain indoor cooling effect, doors and windows play a key role. 1. The development process of European doors and windows The typical representative of European doors and windows energy saving is Germany. The change of German doors and windows energy saving standard is the future development direction of China's doors and windows energy saving. The heat transfer coefficient of German doors and windows was called K value before 1995 (consistent with our country now), and then changed to U value. In 1977, Germany required that the value of profile k should not exceed 3.5w/m2 k, which was reduced to 1.8w/m2 k in 1995, a reduction of nearly half. In 2002, the Uw value of the whole window was required to be no more than 1.7w/m2 k, and in 2009 it was reduced to 1.3w/m2 k. In 32 years, the heat transfer coefficient of German doors and windows has been reduced by 63%, that is to say, the energy consumption has been reduced by 63%. In 2010, Uw in Germany was reduced to 1.0W/m2 · k, and it will be reduced to 0.8W/m2 · k by 2013. The heat transfer coefficient of doors and windows is required to be basically close to the wall. By 2012, except for Spain Uw ≤ 3.1w/m2 k and France Uw ≤ 2.6w/m2 k, Uw in other countries is below 2.0w/m2 k, especially in northern Europe, all below 1.5w/m2 k. 2. China's current status of building energy efficiency standards is an important means to promote China's building energy efficiency. Energy-saving standards have been developed since the 1980 s. In 2005, an energy-saving design standard system covering 50% energy-saving for public buildings and residential buildings was basically established for different climate zones across the country. So far, it has gone through three stages: 30% energy-saving, 50% energy-saving and 65% energy-saving. However, China's energy-saving doors and windows industry is still in its infancy. At present, the heat transfer coefficient of domestic windows is generally between 2.5 and 4.0, which is similar to the level of Germany in 1995. Since 2013, Beijing has taken the lead in implementing the new standard of window heat transfer coefficient less than 1.5 below 3 floors and less than 2.0 above 3 floors, but it is still not as good as the energy-saving requirements implemented in Germany at this stage. China is a big country in energy consumption and real estate. High-performance system doors and windows only account for 0.5 percent of the total number of doors and windows. According to the existing domestic construction housing area of about 43 billion square meters, according to the doors and windows accounting for 25% of the construction area, there are about 11 billion square meters of doors and windows. If the energy saving level reaches the current European standard, 0.42 billion tons of standard coal will be saved each year, which is equivalent to 20% of China's total coal output for the whole year. The country has issued the "Twelfth Five-Year" energy-saving plan, and Beijing has proposed to take the lead in realizing relevant local standards such as the K value of doors and windows. It can be seen that the domestic energy-saving awareness is gradually increasing. However, like other industries in the development of the green building industry chain, the energy-saving door and window industry also needs to precipitate its own energy-saving effects. Many families have such a feeling, sitting by the window in winter, always feel the cold wind blowing in from the window; and in summer, the location near the window is unbearable. In fact, this is caused by the cold and heat radiation of the doors and windows. After improving the performance of the window, the cold and heat radiation is relatively reduced, which not only increases the comfort of people's living, but also increases the effective use area of the building interior. In addition, the performance of good doors and windows, its energy-saving effect can not be underestimated. According to statistics, if a room with 8 external windows uses a broken bridge insulation window, it will save more than 5000 yuan in cooling and heating costs than ordinary windows within 20 years. If a building with 100 external windows uses a broken bridge insulation window, it will save a total of more than 60000 yuan in cooling and heating costs compared with ordinary windows within 20 years. According to a survey conducted by the Steel and Wood Doors and Windows Committee of the China Building Metal Structure Association, the current consumer demand for doors and windows has become more and more obvious. Adapting to different climatic conditions and different regions, system doors and windows with different functional focuses will have huge market space. The development of energy-saving doors and windows industry in China has a long way to go. "Every family uses doors and windows, but few people are willing to pay attention to them. They think that doors and windows are just tools for shelter from wind and rain, and they do not understand the role of doors and windows in building energy conservation." Pan Guanjun, director of the Steel and Wood Doors and Windows Committee of the China Building Metal Structures Association, pointed out that among the three major energy consumption in the whole society, building energy consumption accounts for more than 40% of the total energy consumption of the whole society, and the energy consumption of buildings through doors and windows accounts for the total energy consumption of buildings. Nearly half. "Building energy efficiency, doors and windows are the key. But for a long time, due to social cognitive problems, this important energy-saving field has long been ignored and marginalized." Pan champion said that in winter to reduce indoor heat loss, summer block outdoor heat conduction to the indoor, maintain indoor cooling effect, doors and windows play a key role. It is understood that compared with developed countries, China's energy-saving doors and windows industry is still in its infancy. At present, the proportion of high-performance energy-saving doors and windows in developed countries has reached 70% of the total number of doors and windows, while in China, high-performance system doors and windows only account for 0.5 of the total number of doors and windows. According to the existing domestic construction housing area of about 43 billion square meters, according to the doors and windows accounting for 25% of the construction area, there are about 11 billion square meters of doors and windows. If the energy saving level reaches the current European standard, 0.42 billion tons of standard coal will be saved each year, which is equivalent to 20% of China's total coal output for the whole year.

Among the three major energy consumption in the whole society, building energy consumption accounts for more than 40% of the total energy consumption of the whole society, and the energy consumption of buildings through doors and windows accounts for nearly half of the total energy consumption of buildings. Building energy efficiency, doors and windows are the key. But for a long time, due to social cognitive problems, this important energy-saving field has been neglected and marginalized for a long time. Reduce indoor heat loss in winter, block outdoor heat conduction to indoor in summer, maintain indoor cooling effect, doors and windows play a key role.1. The development process of European doors and windows
The typical representative of European doors and windows energy saving is Germany. The change of German doors and windows energy saving standard is the future development direction of China's doors and windows energy saving.
The heat transfer coefficient of German doors and windows was called K value before 1995 (consistent with our country now), and then changed to U value. In 1977, Germany required the value of profile k to be no more than 3.5w/m2 k, and in 1995 it was reduced to 1.8w/m2 k, a reduction of nearly half. In 2002, the Uw value of the whole window was required to be no more than 1.7w/m2 k, and in 2009 it was reduced to 1.3w/m2 k. In 32 years, the heat transfer coefficient of German doors and windows has been reduced by 63%, that is to say, the energy consumption has been reduced by 63%. In 2010, Uw in Germany was reduced to 1.0W/m2 · k, and it will be reduced to 0.8W/m2 · k by 2013. The heat transfer coefficient of doors and windows is required to be basically close to the wall.
by 2012, except for Spain Uw ≤ 3.1w/m2 k and France Uw ≤ 2.6w/m2 k, Uw in other countries is below 2.0w/m2 k, especially in northern Europe, all below 1.5w/m2 k.
2. China's current situation
Building energy efficiency standards are an important means to promote China's building energy efficiency work. Energy-saving standards have been developed since the 1980 s. In 2005, an energy-saving design standard system covering 50% energy-saving for public buildings and residential buildings was basically established for different climate zones across the country. So far, it has gone through three stages: 30% energy-saving, 50% energy-saving and 65% energy-saving. However, China's energy-saving doors and windows industry is still in its infancy. At present, the heat transfer coefficient of domestic windows is generally between 2.5 and 4.0, which is similar to the level of Germany in 1995. Since 2013, Beijing has taken the lead in implementing the new standard of window heat transfer coefficient less than 1.5 below 3 floors and less than 2.0 above 3 floors, but it is still not as good as the energy-saving requirements implemented in Germany at this stage.
China is a big country in energy consumption and real estate. High-performance system doors and windows only account for 0.5 percent of the total number of doors and windows. According to the existing domestic construction housing area of about 43 billion square meters, according to the doors and windows accounting for 25% of the construction area, there are about 11 billion square meters of doors and windows. If the energy saving level reaches the current European standard, 0.42 billion tons of standard coal will be saved each year, which is equivalent to 20% of China's total coal output for the whole year. The country has issued the "Twelfth Five-Year" energy-saving plan, and Beijing has proposed to take the lead in realizing relevant local standards such as the K value of doors and windows. It can be seen that the domestic energy-saving awareness is gradually increasing. However, like other industries in the development of the green building industry chain, the energy-saving door and window industry also needs to precipitate its own energy-saving effects.
Many families have such a feeling. When sitting by the window in winter, they always feel the cold wind blowing in from the window; in summer, the position near the window is extremely hot. In fact, this is caused by the cold and heat radiation of the doors and windows. After improving the performance of the window, the cold and heat radiation is relatively reduced, which not only increases the comfort of people's living, but also increases the effective use area of the building interior.
In addition, the energy-saving effect of doors and windows with good performance should not be underestimated. According to statistics, if a room with 8 external windows uses a broken bridge insulation window, it will save more than 5000 yuan in cooling and heating costs than ordinary windows within 20 years. If a building with 100 external windows uses a broken bridge insulation window, it will save a total of more than 60000 yuan in cooling and heating costs compared with ordinary windows within 20 years.
China Construction Metal Structure Association Steel Wood Doors and Windows Committee survey shows that the current consumer demand for doors and windows has become more and more obvious functional, to adapt to different climatic conditions, different regions, with different functional focus on the system doors and windows will have a huge market space.
The development of China's energy-saving doors and windows industry has a long way to go
"Every family uses doors and windows, but few people are willing to pay attention to them. They think that doors and windows are just tools for shelter from wind and rain, and they do not understand the role of doors and windows in building energy conservation." Pan Guanjun, director of the Steel and Wood Doors and Windows Committee of the China Building Metal Structures Association, pointed out that among the three major energy consumption in the whole society, building energy consumption accounts for more than 40% of the total energy consumption of the whole society, and the energy consumption of buildings through doors and windows accounts for the total energy consumption of buildings. Nearly half.
"Building energy efficiency, doors and windows are the key. But for a long time, due to social cognitive problems, this important energy-saving field has long been ignored and marginalized." Pan champion said that in winter to reduce indoor heat loss, summer block outdoor heat conduction to the indoor, maintain indoor cooling effect, doors and windows play a key role.
It is understood that compared with developed countries, China's energy-saving doors and windows industry is still in its infancy. At present, the proportion of high-performance energy-saving doors and windows in developed countries has reached 70% of the total number of doors and windows, while in China, high-performance system doors and windows only account for 0.5 of the total number of doors and windows. According to the existing domestic construction housing area of about 43 billion square meters, according to the doors and windows accounting for 25% of the construction area, there are about 11 billion square meters of doors and windows. If the energy saving level reaches the current European standard, 0.42 billion tons of standard coal will be saved each year, which is equivalent to 20% of China's total coal output for the whole year.