We spend nearly twice the cost every year to pay for our own doors and windows that are not energy-efficient!
When you enjoy air conditioning or floor heating in your house, doors and windows can only solve the problem of heat convection, but can not stop the heat conduction. A lot of energy in the house flows through your doors and windows to the outside, generating energy waste and increasing your energy expenditure. If your doors and windows are more energy efficient, the situation will be different.
One day in early 2008, a German businessman used the European standard energy-saving windows and doors to repair the villa in order to make his villa in the suburb of Beijing meet the green energy saving standard of "passive room" in germany. After energy-saving transformation, he found that the summer indoor air conditioning is even lower than the outdoor 8 degrees Celsius, the monthly electricity bill is less than half of the past. Even if the air conditioner is opened, it will not run as frequently as before, refrigeration, noise, comfort is also greatly improved.
In fact, the importance of energy saving doors and windows has been widely recognized in developed countries. According to "2013-2017 years of China's metal door and window industry development prospects and investment forecast analysis report" to understand, in Europe, the use of energy-saving doors and windows has reached 67% of the total doors and windows. The vast majority of doors and windows in China are non energy saving plastic steel and ordinary aluminum alloy doors and windows, energy-saving doors and windows account for only 0.4% of the total window.
Doors and windows not save energy, not only make the people for daily energy expenditure spend a lot of undeserved money, but also make the country produce huge energy waste. Survey shows that in the society of our country in primary energy consumption, building energy consumption accounted for the total energy consumption of the whole society in 2000 20%, with the crazy development of real estate in recent years, the building energy consumption has accounted for 40% of the total energy consumption of the whole society, and the energy loss of doors and windows accounted for about 50% of building energy consumption, change in other words, the energy loss and total social energy consumption accounts for about 20%.
Energy saving doors and windows popularity is low, resulting in China's building energy consumption is more than 3 times of developed countries. According to the relevant department estimates, if the energy level of China's doors and windows 43 billion square meters of existing construction in the area of can reach the current European standards, annual savings of coal 4.2 tons, equivalent to China's annual coal output 20%. And the reduction of coal consumption, will directly help reduce haze generation (central heating, a large number of coal is one of the main causes of the northern winter prone to haze weather). The resulting health level, the improvement of the ecological environment and a series of good, far beyond the cost of energy-saving doors and windows replacement.
"Latent energy waste is now a hundredfold and a thousand times greater than a waste of food and drink, of which doors and windows are" big funnels ". Doors and windows can't be found in every family, but most people don't understand doors and windows now." Ni Shouqiang, vice president of China Building Metal Structure Association, said the whole story.
What is door and window energy saving? In the door and window industry, there is a heat transfer coefficient, K value. The greater the K value is, the more heat is transferred and the more energy is lost; on the contrary, the less heat is transferred, the less energy is lost.
According to the EU standards, the K value of doors and windows is generally between 1.1 and 1.3. In recent years, German doors and windows K value standard dropped from 1.3 to 1.1, Switzerland from 1.3 to 0.7, France plans to achieve zero energy consumption in 2020.
In contrast, the current status of energy-saving doors and windows in China is worrying. Compared with the developed countries, we are lagging behind for nearly 30 years. For example, the K value in Shanghai is 2.8, which is equivalent to the German standard in 1984.
Fortunately, the relevant government departments have been aware of the importance of energy-saving doors and windows, all over the country in the development and introduction of energy-saving doors and windows more stringent standards, Beijing, Tianjin area has begun to implement the K value is less than or equal to 2 of the standard, Inner Mongolia and Northeast China also carried out less than 2.2 standard.
The Copenhagen climate conference, Prime Minister's solemn commitment to the world: "by 2020, China's carbon dioxide emissions per unit of GDP fell 40% in 2005, 50% to 2020, China's non fossil energy accounts for the proportion of primary energy consumption reached 15%." This means that in the next 5 years, China will take effective measures to increase energy conservation and emission reduction efforts. As the building energy consumption accounted for the proportion of social energy consumption greatly will bear the brunt of the doors and windows as building opening lighting area, the actual building energy consumption accounted for 50%, such a change to the energy-saving doors and windows industry will become the inevitable trend.