China is a large developing country and a large building country. The annual housing area is as high as 1.7-1.8 billion square meters, which exceeds the total construction area of ​​all developed countries. With the gradual advancement of building a well-off society in an all-round way, the construction industry has developed rapidly and building energy consumption has grown rapidly. The so-called building energy consumption refers to the energy consumption of buildings, including heating, air conditioning, hot water supply, lighting, cooking, household appliances, elevators and other aspects of energy consumption. The energy consumption of heating and air conditioning accounts for 60%~70%.
China has nearly 40 billion square meters of buildings, only 1% of which are energy-efficient buildings. The rest are high-energy buildings, measured by building envelopes and heating and air conditioning systems. The energy consumption per unit area of ​​heating is equivalent to 2 to 3 times that of developed countries with similar latitudes. This is due to the poor thermal insulation performance of China's building envelopes, and 2/3 of the heating energy used to run away. The annual number of newly built buildings is really less than 100 million square meters. The total energy consumption of buildings has exceeded 27% of China's total energy consumption, and is gradually approaching 30%.
Since China is a developing country with a large population, the per capita energy resources are relatively scarce. The per capita arable land is only one-third of the world's per capita arable land, and the water resources are only one-fourth of the world's per capita possession. The proven coal reserves account for only 11% of the world's reserves, and crude oil accounts for 2.4%. The solid clay bricks used in the new construction every year will destroy 120,000 mu of fertile land. The level of material consumption is 10%-25% higher than that of developed countries, and 80 kg of cement per cubic meter of concrete. The wastewater reuse rate is only 25%. To achieve sustainable development in the national economy, it is imperative to implement building energy conservation.
At present, China's building energy consumption is extremely serious, and the growth rate of building energy consumption far exceeds the speed of China's energy production. If this high-energy building continues to develop, the country's energy production will be difficult to support this kind of long-term. Wasted demand, and thus forced to organize large-scale energy-saving renovation of old houses, which will cost more manpower and resources.
Actively improving energy efficiency in buildings can greatly alleviate the country's energy shortage and promote the development of China's national economic construction. Therefore, building energy conservation is an important measure to implement a sustainable development strategy, achieve national energy conservation planning goals, and reduce greenhouse gas emissions, in line with global development trends.
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