EU stipulated that starting from 2020, all newly-built houses in the 27 EU countries that fail to meet the Passive House standard will not be issued with construction permits. In Europe, low energy consumption passive houses are increasing at an annual rate of 8%. As of January 2020, the number of certified Passive Houses worldwide has exceeded 25,000. The total construction area is nearly 2,350,000 square meters.
The entire structural system of the low-energy building is in the protective layer, protected from the erosion of wind, frost, rain, and snow. The temperature is basically between 20～26℃ throughout the year, which can greatly reduce the building loss.
(1) Get rid of the dependence on fossil energy, realize building energy saving and emission reduction
It allows heating to completely get rid of the dependence on fossil energy. A low-energy building can save at least 90% of energy compared with ordinary buildings.
(2) Low-energy buildings can be warm as spring without heating in winter
Low-energy buildings can provide people with a warm indoor environment in winter without heating facilities and maintain the indoor temperature above 20°C.
(3) It relieves the peak pressure of electricity consumption in summer and alleviates the urban heat island effect
If ordinary buildings that generate heat islands are transformed into low-energy buildings, the heat islands will be eliminated. In this way, as urban low-energy buildings gradually replace ordinary buildings, the urban summer temperature will also drop.
(4) It promotes the upgrading and development of the construction and building materials industry
Low energy buildings have extremely high requirements for construction standards and building materials, which will promote the provision of a competitive market environment and promote industrial progress. At the same time, result-oriented inspections force workers to perform delicate construction at every step.
(5) Low-energy buildings provide people with a healthy and safe indoor environment
Low-energy buildings can effectively isolate outdoor haze, carbon dioxide, carbon dioxide, Ozone, even mold spores, air can only enter the room through a fresh air system with efficient heat recovery. The fresh air system can control the in and out of water vapor to maintain a comfortable temperature and humidity.
(6) It provides a clear theory of building energy efficiency, making building energy efficiency simple and easy
The envelope structure standard of low-energy buildings is no thermal bridge and no air leakage. This feature makes the calculation method of building energy consumption very clear.
Therefore, the development oflow energy buildings is in line with the trend and is the only way for the development of building energy efficiency. The in-depth promotion of low energy consumption buildings and the creation of a healthy, comfortable and livable environment are of great significance to improving the level of building energy conservation, promoting industry transformation and upgrading, and environmental protection. New building materials such as autoclaved aerated concrete just meet the requirements of low-energy buildings, and significantly reduce energy consumption in production, construction, and application.