1. Building energy consumption accounts for about 1/3 of total social energy consumption. [2] The total energy consumption of buildings in China has increased year by year, and the proportion of total energy consumption has been 10% from the end of the 1970s. It rose to 27.45% in recent years. The energy consumption of buildings in developed countries generally accounts for about 33% of the total energy consumption in the country. Based on this, the research of the Science and Technology Department of the Ministry of Construction shows that with the acceleration of urbanization and the improvement of people's quality of life, the proportion of energy consumption in China's construction will eventually rise to around 35%. With such a large proportion, building energy consumption has become the soft underbelly of China's economic development.
2. The proportion of high-energy buildings is large, which has aggravated the energy crisis. Until the end of 2002, China's energy-efficient building area was only 230 million square meters. At present, more than 40 billion square meters of houses built in China are high-energy-consumption buildings, with a huge total and a huge energy crisis. As the relevant person in charge of the Ministry of Construction pointed out, by the end of 2000, China’s construction industry consumed 376 million tons of standard coal per year, accounting for 27.6% of the total energy consumption of the whole society, while the increase in building energy consumption for the country’s greenhouse gas emissions. The "contribution rate" has reached 25%. Due to the high proportion of high-energy buildings, the single northern heating area consumes 18 million tons of standard coal per year, with direct economic losses of 7 billion yuan and multi-row carbon dioxide of 520,000 tons. If this situation continues to develop, by 2020, China's building energy consumption will reach 108.9 billion tons; by 2020, the peak load of air conditioning summer will be equivalent to the full capacity of 10 Three Gorges power stations, which will be a very amazing quantity. According to analysis, China is currently in the period of construction and development, and the annual housing area is as high as 1.6 billion to 2 billion square meters, which exceeds the total construction area of ​​all developed countries, and more than 97% is high-energy buildings. With such a growth rate, it is estimated that by 2020, the country's high energy-consuming building area will reach 70 billion square meters. Therefore, if you do not start to pay attention to building energy-saving design now, it will directly aggravate the energy crisis.
3. China's building energy conservation [1] is in a backward situation and needs to be improved. After the energy crisis in the 1970s, developed countries began to study and implement building energy-saving technologies, but China has ignored this issue. Today, China's building energy efficiency [1] level lags far behind developed countries. For example, the thermal function of the envelope structure in most heating areas in China is much worse than that in developed countries with similar climate. The outer wall has a heat transfer coefficient of 3.5 to 4.5 times, the outer window is 2 to 3 times, the roof is 3 to 6 times, and the air permeability of the doors and windows is 3 to 6 times. At present, the actual annual heating energy consumption of European country houses has generally reached 6 liters of oil per square meter, which is equivalent to 8.57 kilograms of standard coal per square meter. In China, the building energy consumption is 50%, and its heating energy consumption per square meter. The rice should also reach 12.5 kilograms, about 1.5 times that of European countries. For example, in Germany, which is generally close to Beijing's climatic conditions, the building heating energy consumption standard before 1984 is similar to that of Beijing. It consumes 24.6 to 30.8 kg of standard coal per square meter per year, but by 2001, the figure in Germany was reduced to The average energy consumption of 3.7 to 8.6 kilograms of standard coal per square meter is reduced to about 1/3 of the original, while Beijing has always been 22.45.
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