In the interview, Tian Guomin, director of the standard quota Department of the Ministry of housing and urban rural development, said that the Ministry of housing and urban rural development will formulate mandatory standards in the next step, continuously improve the level of building energy conservation, and comprehensively force the promotion of ultra-low energy consumption buildings in appropriate climate areas
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During the 13th Five Year Plan period, the cumulative promotion of ultra-low and near zero energy consumption buildings throughout the country reached 12 million square meters, covering residential, public buildings Various building types such as industrial buildings
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Most of the power resources used for cooling with air conditioning also rely on fossil energy such as coal power
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Compared with ordinary buildings, the cost per square meter should be increased by more than 1000 yuan, which reduces consumers’ purchase intention to a certain extent
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Construction accounts for a large proportion of total carbon emissions
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It is not simply energy-saving
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Obviously, in order for more people to actively choose ultra-low energy consumption buildings, in addition to technology and market, we also need to understand this technology and the guidance and support of relevant policies
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In addition, vapor barrier membrane and breathable membrane are set indoors and outdoors to ensure the air tightness of the building and minimize the loss of heat
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A resident of Gaobeidian, Hebei Province, had a personal experience after moving into the first batch of ultra-low energy consumption buildings built in China before the Spring Festival
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The common method is not to turn on the heating too high in winter and not to adjust the air conditioning temperature too low in summer
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At the same time, by formulating the implementation plan for carbon peaking in the field of urban and rural construction, we will comprehensively promote energy conservation and emission reduction and make positive contributions to China’s realization of the double carbon goal
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In the past, energy conservation and low carbon were advocated
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Xu Wei said: “in the northern residential buildings dominated by heating, if ultra-low energy consumption buildings are realized, they will be roughly reduced by more than 50% compared with the current energy-saving standards
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Therefore, how to implement emission reduction in the construction field has also become an important topic
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The thickness of thermal insulation materials on the building facade is 2 to 3 times that of ordinary houses, just like putting a thick cotton padded jacket on the house; The three-layer double insulating glass used in the window has a much better heat insulation and cold protection than ordinary glass
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1、 Lower energy consumption and more comfortable living
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On this basis, the energy consumption will be greatly reduced by using the high-efficiency fresh air system for temperature regulation
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There are few manufacturers and the price is relatively high
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At the same time, by formulating the implementation plan for carbon peaking in the field of urban and rural construction, we will comprehensively promote energy conservation and emission reduction and make positive contributions to China’s realization of the double carbon goal
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This has also resulted in a corresponding increase in the cost of ultra-low energy consumption buildings
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Click the blue words above to pay attention
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This is because China has promised to strive to reach the peak of carbon dioxide emissions by 2030, and the carbon dioxide emissions before 2060 should be offset in a variety of ways, which is carbon neutralization
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Efficiency improvement: greatly improve the efficiency of all energy consumption systems in buildings
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4、 In the interview, Tian Guomin, director of the standard quota Department of the Ministry of housing and urban rural development, said: the Ministry of housing and urban rural development will formulate mandatory standards in the next step, continuously improve the level of building energy conservation, and comprehensively force the promotion of ultra-low energy consumption buildings in appropriate climate areas
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Taking heating as an example, coal is directly consumed by most central heating
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The temperature has been maintained between 20-25 degrees, and the PM2.5 value of the air has also been reduced to single digits
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In coordination with the theme activities of the publicity week, CCTV1’s focus interview broadcast a program with the theme of ultra-low energy consumption and green buildings
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For example, there are certain parameter requirements for steam permeable membrane, gas barrier membrane and thermal insulation pad
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By adding insulation pads, direct contact between metal parts and concrete is prevented to form broken bridges and avoid unnecessary heat loss
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On August 24, 2021, ultra-low energy consumption buildings appeared in CCTV focus interview
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Thermal bridges often appear at the joints of doors and windows, brick walls and concrete floors
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2、 The technical cost problem needs to be solved
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In a month and a half, the electricity charge of the fresh air system only cost 260 yuan
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This week is the national energy conservation publicity week, and August 25 is the national low carbon day
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A big reason why the traditional house is not energy-saving is that the house is not sealed well and the heat exchange between indoor and outdoor is fast
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After moving into the new house, there is no need for heating and air conditioning
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To achieve these two goals means that profound changes will take place in our future production and lifestyle
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Moreover, the energy consumption is also very low
Xu Wei said that the carbon emission from construction and operation accounts for about 20% of the country’s total carbon emission
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In 2016, the State Council issued the comprehensive work plan for energy conservation and emission reduction in the 13th five year plan, which proposed to “carry out the pilot of ultra-low energy consumption and near zero energy consumption buildings”
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Generally, the windows are not opened
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In fact, it improves energy-saving under the condition of high comfort
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Now, under the guidance of the overall goal of carbon peak and carbon neutralization, all localities are actively formulating relevant goals from supporting ultra-low energy consumption buildings
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The problem brought by this is that the comfort is not high
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However, because ultra-low energy consumption buildings have higher requirements in design, materials, construction technology and traditional technology, the construction cost is undoubtedly higher than traditional buildings, and not all people can accept this kind of building
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The passive architectural design adopted by ultra-low energy consumption buildings makes up for this
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In order to achieve peak carbon neutralization of building carbon, one of the most important measures is to promote new buildings to realize ultra-low energy consumption buildings as soon as possible
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The ventilation rate of traditional buildings should reach 2-3 times per hour
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Beijing, Shanghai, Hebei and other places also encourage the development and construction of ultra-low energy-saving buildings by means of financial incentives, plot ratio incentives and support for commercial housing development
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In recent years, China has successively promulgated relevant policies to support the construction of ultra-low energy consumption buildings
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The non thermal bridge link of the main structure has just been completed
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Instead, the unified fresh air system of the building works 24 hours to change the air and adjust the humidity, so that the air temperature and humidity in the house are in the most comfortable state of the human body
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” In the process of ultra-low energy consumption construction, it is very important to ensure the air tightness of the building, that is, to minimize the exchange rate of indoor and outdoor gas, prevent the loss of indoor heat in winter and prevent outdoor hot gas from entering the room in summer
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Open source: use renewable energy, solar energy, etc
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It is an important path for new buildings to realize ultra-low energy consumption as soon as possible
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The basic principle of non thermal bridge design is to block the thermal bridges at the joints of different materials by adding appropriate thermal insulation layers
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In addition, there is the problem of thermal bridge“ “Thermal bridge”, as its name implies, is a bridge used during heat conduction
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to directly supply energy to buildings, greatly reducing the consumption of fossil energy
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If the implicit carbon emission is calculated, it is close to 40%
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It needs to continuously use external energy, such as central heating or air conditioning, to heat up or cool down
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A construction site in Haidian District, Beijing is building the largest single ultra-low energy consumption building at present
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5、 New starting point, new challenges, China’s ultra-low energy consumption buildings have come to a new starting point
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As a relatively new building, ultra-low energy consumption building needs to be improved in design, material supply, construction technology, professionals and so on
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In the future, more people will live in high-quality houses that are comfortable and energy-saving.
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In the process of building construction, there are requirements not only for the doors and windows of the external enclosure, but also for the weak parts to be treated with steam permeable membrane and gas barrier membrane, so as to ensure that a technical index of ultra-low energy consumption buildings is reached: the number of air changes in an hour is less than 0.6
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The theme of this year’s national energy conservation publicity week is “energy conservation, carbon reduction and green development”
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The ultra-low energy consumption building can solve this problem, not only more comfortable to live, but also lower energy consumption
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When the resident moved in, it was the heating season
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3、 Significance of ultra-low energy consumption buildings Xu Wei, chief engineer of China Academy of Building Sciences, said: the reason why ultra-low energy consumption buildings can achieve lower energy consumption and higher comfort mainly depends on three points: energy saving: achieve high performance of building envelope, such as high-performance windows and good thermal insulation external envelope
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