What is the development direction of ultra-low energy consumption buildings?
The construction sector is one of the main areas of energy consumption and carbon emissions in my country. Accelerating energy conservation and carbon reduction in the construction sector is of great significance to achieving carbon peak and carbon neutrality and promoting high-quality development.
What is the development direction of ultra-low energy consumption buildings? How to achieve green and low-carbon transformation of existing buildings? Recently, at the 21st China International Residential Industry and Building Industrialization Products and Equipment Expo, the reporter interviewed relevant experts and business representatives.
As of the end of 2023, a total of 30 million square meters of ultra-low energy consumption buildings were under construction and completed nationwide
"Since 2013, my country has researched and promoted the development of ultra-low-energy buildings. Today, it has achieved three-dimensional development of policies, standards, technologies, products and engineering projects." Referring to the current situation of ultra-low-energy buildings in my country, Ma Yishuo, senior engineer of the Science and Technology and Industrialization Development Center of the Ministry of Housing and Urban-Rural Development and general manager of the Beijing Kangju Certification Center, told reporters.
As of the end of 2023, a total of 30 million square meters of ultra-low energy consumption buildings were under construction and completed nationwide, and more than 9.2 million square meters of ultra-low energy consumption buildings will be added in 2023. All ultra-low energy consumption building products have been localized, and the degree of industrialization continues to increase. The leading and supporting interaction between ultra-low-energy buildings and high-quality building materials industry has achieved initial results.
In Majshuo's view, ultra-low energy consumption buildings are an important aspect of the construction of "good houses" and an important starting point for accelerating the promotion of energy conservation and carbon reduction in the construction field. They are important for accelerating the formation of new productive forces in the construction field and promoting high-quality and sustainable industrial systems. Sustainable development also plays an important role.
"Ultra-low energy consumption buildings must meet the requirements of green, low-carbon, intelligent and safe." Maishuo further pointed out that "a large number of practical project experiences show that when power cuts are cut for 2-3 days in winter, the indoor temperature of ultra-low-energy buildings will only drop by 1 ° C-2 ° C, providing basic protection for residents. Therefore, it can serve as a huge buffer for the energy system, provide flexible support for the power grid and improve regional climate resilience."
Optical storage, direct and soft, passive technology, smart operation and maintenance, etc. are "opening up resources and reducing expenditure" for buildings
At this CIIE, many companies demonstrated the application practices of ultra-low energy consumption, near-zero energy consumption, and low-zero carbon building technologies. A zero-carbon house model with photovoltaic panels covering most of the facade of China Construction Intelligent Land Co., Ltd. attracted the attention of reporters.
This is the first completed scientific and technological demonstration project of the China-Switzerland zero-carbon building project-China Construction·Xuefu Yinyue zero-carbon house.
"Compared with ordinary buildings, this zero-carbon house can achieve energy saving by more than 40%. It is expected to save 90,000 kilowatt-hours of electricity and reduce carbon emissions by 85.7 tons per year." Song Zhicheng, deputy general manager of China Construction Intelligent Design Department, told reporters that during the design, construction, and operation and maintenance processes, they have formed a set of "optimization of building plans-fine simulation of carbon reduction measures-integration of renewable energy systems-intelligent operation and maintenance platform management". The technical model "uses building photovoltaic integration (BIPV), optical storage direct and flexible technology, smart operation and maintenance, etc. to" open up resources and reduce expenditure "for the building to achieve zero carbon emissions throughout the life cycle of the building.
Reclaimed glass landscape walls made of glass fragments, seats made of recycled milk cartons... In order to make the concept of low-carbon and zero-carbon deeply rooted in the hearts of the people, China Construction Intelligence has also built a zero-carbon park on the south side of the zero-carbon house, setting up interactive devices such as photovoltaic corridors and unpowered bicycles and a series of energy-saving publicity facilities to promote popular science.
Huajian Hotel also adopts passive ultra-low-energy building design.
"The efficient exterior wall insulation system improves the exterior wall insulation effect by 3.8 times; the door and window system with efficient insulation, sealing and sound insulation minimizes the heat conduction of the exterior window and improves the overall waterproofness and airtightness of the exterior window; The efficient heat recovery fresh air air conditioning system achieves a heat recovery rate of more than 75%, reducing heating energy consumption in winter..." Speaking of the hotel's low-energy technology, Ding Sanlian, executive vice president of Shandong Huajian Aluminum Group Co., Ltd., is familiar.
Not only that, the hotel has also built an energy consumption environmental monitoring platform, which can not only monitor indoor air temperature, humidity, PM2.5Concentration, CO2Monitoring the concentration can also classify and measure the energy consumption of heating and cooling, lighting, sockets and power.
How can ultra-low energy consumption buildings and their industries develop with high quality?
In Majshuo's view, after more than ten years of technical research and promotion, a large number of ultra-low energy consumption building projects have entered a stable operating state, and building energy consumption monitoring, publicity and evaluation have become the focus of work.
In the future, on how to promote the high-quality development of ultra-low energy consumption buildings and their industries, Ma Yishuo gave the following suggestions:
Establish and improve laws, regulations and policy systems. Clarify the promotion and regulatory requirements for ultra-low-energy buildings, low-carbon (zero-carbon) buildings, low-carbon renovation of existing buildings, and "dual control" of building carbon emissions, and revise relevant regulations that are not conducive to the efficient and energy-saving development of buildings. Establish and improve the reward and punishment mechanism and give full play to the role of standardization and guidance.
Pay equal attention to expanding scale and improving quality. Ultra-low-energy buildings require high-performance building materials and products, as well as refined design, construction and operation and maintenance management, to simultaneously achieve improved indoor comfort and reduced building energy consumption. We must persist in increasing awareness and expanding scale, insisting on implementing clear effectiveness supervision, comprehensively improving building quality and promoting high-quality development of the entire industry chain of the construction industry.
Play an important role in driving quantitative indicators. Only buildings that pass strict quantitative indicators can be called ultra-low-energy buildings. It is necessary to establish an assessment mechanism based on energy consumption data, which is connected with energy consumption limit management, linked with construction insurance, carbon trading, etc., and use "numbers" to speak, strengthen the responsibilities of competent departments and building construction operations entities, shift from government-driven vectorized benefits, and give full play to the virtuous cycle of quantitative results and ultra-low-energy buildings and their industries.
From "cost center" to linkage with industry. At present, various localities have not organically coordinated building energy conservation, high-quality development of the construction industry and the cultivation of industrial momentum in promoting ultra-low-energy buildings. Initial investment in ultra-low-energy building construction has increased, resulting in development bottlenecks. It is necessary to break the "cost-centered" thinking, actively link with industries, promote industrial upgrading and technical standard systems, and restructure new industries, new clusters, and new economies in the region.
