The European Union stipulates that starting in 2020, the 27 countries of the European Union stipulate that all newly built houses that cannot meet the passive house standard will not be issued construction permits. In Europe, ultra-low energy passive houses are increasing by 8% per year.
As of January 2020, more than 25,000 Passive Houses have been certified worldwide. The total construction area is nearly 2,350,000 square meters.
In China, the annual coal consumption reaches 3.7 billion tons, and the pollution caused by a large amount of energy consumption is very serious. In the future, it has been a consensus from all walks of life that cities should take a green, low-carbon sustainable development route. Therefore, the development of ultra-low energy consumption buildings is in line with China's national conditions and is the only way for the development of building energy conservation. The in-depth promotion of ultra-low energy consumption buildings to create a healthy, comfortable and livable environment can effectively serve the strategic deployment of healthy China and contribute to the improvement of building energy efficiency. It is of great significance to improve the level, promote the transformation and upgrading of the industry, environmental protection, etc., and can promote the harmonious and orderly coexistence and development of people, buildings and the environment.
Change the current situation of short building life in our country
Promote the sustainable development of society
The entire structural system of the ultra-low energy building is in the protective layer, protected from the erosion of wind, frost, rain and snow, and is basically between 20 and 26 °C throughout the year, which can greatly reduce building losses.
Moreover, ultra-low energy consumption buildings are very beneficial to my country's future GDP growth. If we renovate the existing buildings of more than 60 billion square meters according to the passive house standard, it will take 300 years to complete the transformation based on the annual transformation of 200 million square meters. That is to say, Passive House can contribute to my country's GDP for at least 300 years.
It is estimated that by 2050, there will be 8 billion square meters to 26 billion square meters of ultra-low energy consumption building industry capacity in the country.
Get rid of dependence on fossil energy
Realize building energy saving and emission reduction
To completely get rid of the dependence on fossil energy for heating, an ultra-low energy consumption building can at least save more than 90% of energy than ordinary buildings.
At present, the consumption of fossil energy by the total building volume in my country is increasing year by year. The main factors for the increase in building energy consumption are: first, the rigid increase in energy consumption brought about by the increasing number of new buildings; second, the increase in energy consumption caused by people's pursuit of a more comfortable indoor environment.
If all the houses in our country are ultra-low energy consumption buildings, then it is possible to save about 40% of the social terminal energy consumption, which can greatly alleviate the energy shortage and greatly reduce greenhouse gas emissions.
Ultra-low energy buildings do not need heating in winter
as warm as spring
Ultra-low energy consumption buildings can provide people with a warm indoor environment in winter without heating facilities, and maintain the indoor temperature above 20°C. While reducing energy consumption, it can meet the needs of people's indoor temperature in winter.
Ease the pressure of peak electricity consumption in summer
Mitigate the urban heat island effect
Many cities in my country experience high temperatures and extreme heat in summer, and residents cannot live without air conditioners for temperature regulation. However, as the urban heat island effect becomes more and more severe (taking Shanghai and Beijing as examples, the urban heat island area is 7°C higher than the normal area- 9°C), raising the temperature of the entire city, which in turn leads to a further increase in air-conditioning energy consumption, forming a vicious circle.
And ultra-low energy buildings do not produce heat island effect. If ordinary buildings that generate heat islands are transformed into ultra-low energy buildings, heat islands will be eliminated. In this way, as urban ultra-low energy buildings gradually replace ordinary buildings, the summer temperature in cities will also drop.
Promote the construction and building materials industry
Industrial upgrading and development
Construction quality has always been a worrying issue. The reverse elimination of "bad money drives out good money" in the building materials industry has hindered the progress of my country's construction industry and corrupted the market environment, resulting in a huge waste of energy in the whole society.
my country's building life is generally short, a German expert estimates that all the investment costs of ultra-low energy buildings can be recovered in 60 years by saving energy. Ordinary houses are likely to face demolition and reconstruction in a few decades, and reconstruction will not only generate a pile of construction waste, but also consume resources and energy again.
Ultra-low energy consumption buildings have extremely high requirements on construction standards and building materials, which will promote the provision of a competitive market environment and promote industrial progress. At the same time, results-oriented inspections force workers to be meticulous at every step.
Ultra-low energy buildings provide people with
Healthy and safe indoor environment
At present, air pollution caused by industrial development and transportation is constantly intruding on people's living environment, and ultra-low energy consumption buildings can effectively isolate outdoor haze and carbon dioxide due to their tight building envelopes, especially high airtight passive windows. , ozone, and even mold spores, the air can only enter the room through a fresh air system with efficient heat recovery.
The fresh air system can control the inflow and outflow of water vapor to maintain a comfortable temperature and humidity for the human body. Therefore, ultra-low energy buildings can provide people with a safer and more comfortable indoor environment.
Provide a clear building energy efficiency theory
Making Building Energy Efficient Simple and Easy
The outer envelope standard for ultra-low energy buildings is no thermal bridges and no air leakage. This feature makes the energy consumption calculation method of the building very clear.
For example, it is difficult to determine the air leakage of ordinary houses, and it is impossible to accurately calculate the energy loss caused by air leakage; while the fresh air of ultra-low energy consumption buildings is organized, and the ventilation is determined according to the oxygen demand of people. In this way, the loss caused by the air exchange of the ultra-low energy building becomes calculable and easy to calculate. The generation of ultra-low energy buildings makes building energy-saving technology quantifiable and standard.