[Explanation] On May 18, the two-day 2021 (seventeenth) International Green Building and Building Energy Conservation Conference and New Technology and Product Expo was held in Chengdu, Sichuan.

As the most influential science and technology forum in the field of green building in China and even Asia, the conference invited more than 20 academicians and more than 400 well-known experts and scholars at home and abroad to participate.

  [Explanation] Under the current background of “carbon neutrality and carbon peaking”, green buildings have become an important starting point for promoting the transformation, upgrading and high-quality development of the construction industry.

How to promote the "carbon neutrality" of the construction industry and build a new system of green production and life has become the core issue discussed at this conference.

At the opening ceremony, Jiang Yi, academician of the Chinese Academy of Engineering and director of the Building Energy Conservation Research Center of Tsinghua University, gave a speech entitled "The Low-Carbon Development Path of Buildings in my country".

He pointed out that the construction industry, as a major carbon emitter, should replace fossil fuels with electricity as much as possible in future end-use energy to achieve full electrification.

  [Concurrent] Jiang Yi, Academician of the Chinese Academy of Engineering, Director of the Building Energy Efficiency Research Center of Tsinghua University

  Now the central government has proposed the "dual carbon" strategy, which has put forward new requirements for our construction industry, which is a challenge and an opportunity.

So how can architecture contribute to China's low-carbon development?

The first is to eliminate direct carbon dioxide emissions in buildings, which is to fully realize electrification, changing gas to electricity, and coal to electricity.

No longer in buildings, to burn any fossil fuels for energy.

  [Explanation] Jiang Yi said that with the full electrification of buildings in the future, the direct application of other types of fuels will be converted to electricity, and the electricity consumption of buildings will continue to increase.

This requires the building to improve the degree of power flexibility and optimize the intelligent control algorithm of various power consumption terminals.

  [Concurrent] Jiang Yi, Academician of the Chinese Academy of Engineering, Director of the Building Energy Efficiency Research Center of Tsinghua University

  After coal and gas are converted to electricity, buildings must take advantage of the characteristics of electricity consumption to help the power system to cut peaks and fill valleys, and better absorb wind power and photovoltaics, so it is necessary to build light storage, direct and flexible buildings.

"Light" means installing photovoltaics on the surface and roof of buildings, which can bear 20% to 30% of the electricity consumption of buildings in the city; "storage" means putting some distributed chemical energy storage in the building; "straight" means the inside of the building. It needs to be changed to DC power supply; "flexible", the building realized by the above method becomes a flexible load, it is not how much electricity I need to be supplied by the grid, but how much electricity the grid allows me to take from the Internet when Electricity, I can get as much electricity, if it is bad, it can be solved from energy storage and flexible electricity use.

  [Explanation] Urban demolition and construction is an important factor that is not conducive to reducing carbon emissions.

Jiang Yi said that on the basis of the continuous expansion of the scale of buildings, it is necessary to strengthen the energy-saving and comfortable renovation of existing buildings, and reduce major demolition and construction.

  [Concurrent] Jiang Yi, Academician of the Chinese Academy of Engineering, Director of the Building Energy Efficiency Research Center of Tsinghua University

  Vigorously reduce the use of steel, cement and other building materials in the process of building houses and repairs, and (reduce) carbon dioxide emissions during the production of these building materials.

A very small number of houses demolished now are due to poor longevity and poor structure. Most of them are to increase area, improve functions, and improve quality.

The emission reduction of industrial production must first be adjusted on the demand side, and the demand side means that the scale of construction needs to be controlled.

  Chen Xuanbin reports from Chengdu

Editor in charge: [Ji Xiang]