The general code for building energy conservation and renewable energy utilization requires that carbon emission reports should be submitted in the feasibility study report, construction scheme and preliminary design documents for new, expanded and reconstructed buildings and energy-saving reconstruction of existing buildings.
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How to calculate the carbon emission in the construction and demolition stage? The carbon emissions in the construction stage and demolition stage shall be determined according to the different types of energy consumption (such as electricity, gasoline, diesel, etc.) in the construction stage (KWH or kg) and the carbon emission factors of different types of energy (kgco / kWh or kgco / kg)..
how to calculate the carbon emission during the operation phase? In addition to the carbon emissions of HVAC, domestic hot water, lighting and elevators during building operation, the carbon emissions in the operation stage also need to consider the carbon reduction of renewable energy and building carbon sink system.
Carbon emission report shall be provided in the stages of pre evaluation (after completion of construction drawings) and evaluation (after completion acceptance / one year of operation).
As a mandatory engineering construction specification, all provisions are required to be strictly implemented.
The “feasibility study report”, “construction scheme” and “preliminary design document” of the construction project shall include the analysis report on building energy consumption, renewable energy utilization and building carbon emission.
Among them, the calculation of building carbon emission has become a mandatory requirement in architectural design documents for the first time.
2.0.5 building energy efficiency design shall be carried out for new, expanded and reconstructed buildings and energy-saving transformation of existing buildings.
Requirements of various standards for carbon emission calculation submission stage 3 What are the different requirements for carbon emission reporting in each design stage? Due to the different design depth in each design stage, the requirements for the scope of carbon emission calculation are also different, as shown in the table below.
In the evaluation standard for green buildings, carbon emission calculation is the scoring item in the chapter of “improvement and innovation” (article 9.2.7).
China’s relevant standards for carbon emission calculation (the picture comes from the network).
How to calculate the carbon emission during the production and transportation of building materials? The carbon emission calculation of building materials production and transportation shall include building main structure materials, building envelope materials, building components and parts, etc.
The carbon emission in the transportation stage of building materials shall be determined according to the consumption of main building materials (T), the average transportation distance of building materials (km), and the carbon emission factor per unit weight transportation distance under the mode of transportation (kgcoe / (t.km)).
The use of low value waste and recyclable materials can effectively reduce carbon emissions from building materials production.
For the project put into use, the relevant data of carbon emission in the operation stage shall be obtained based on the actual operation data.
On carbon emissions, we need to know the following nine points: 1 What phases of the building’s life cycle are included in the carbon emission calculation? According to the calculation standard of building carbon emission (GB / t51366-2019), the calculation of carbon emission in the whole life cycle of buildings mainly includes carbon emission in operation stage, construction and demolition stage and building materials production and transportation stage.
The announcement made it clear that the national standard general code for energy conservation and renewable energy utilization in buildings (gb55015-2021) will be implemented from April 1, 2022.
The carbon emission in the operation stage shall be determined according to the different types of energy consumption of each system (such as natural gas, electricity, etc.) and the carbon emission factors of different types of energy.
In addition, different calculation methods of building carbon emissions are also proposed in the industrial standard calculation standard for green performance of civil buildings JGJ / t449-2018 and the national standard atlas 15j904.
The calculation range of carbon emission in each stage is as follows: the calculation range of building carbon emission in each stage is 2 Which design stages need to submit carbon emission calculation reports? At present, there are two main standards that have clear requirements for carbon emission report: general code for energy efficiency and renewable energy utilization in buildings gb55015-2021 and evaluation standard for green buildings GB / t50378-2019.
For projects that have not been put into use, the predicted carbon emissions of buildings under standard operating conditions shall be adopted.
On September 8, 2021, the Ministry of housing and urban rural development issued an announcement on the national standard general code for building energy conservation and renewable energy utilization.
Each standard puts forward the carbon emission calculation methods at different stages of the whole life cycle of buildings, as follows: the carbon emission calculation methods proposed in the relevant standards for carbon emission calculation.
The construction drawing design documents shall specify the technical requirements for building energy conservation measures and operation management of renewable energy utilization system.
Calculation requirements of carbon emission report in each stage 4 What are the methods of carbon emission calculation? What standards and atlas can you refer to? At present, China mainly calculates carbon emissions according to the calculation standard of building carbon emissions (GB / t51366-2019) issued by the Ministry of housing and urban rural development in 2019.
According to the key points of construction drawing design of green buildings in Beijing, if this score item is selected, the carbon emission calculation report shall also be submitted during the external review of construction drawings.
Among them, the calculation method of carbon emission in the whole life cycle of buildings is introduced in the most comprehensive and detailed way in GB / t51366-2019, which is the main basis for China’s current carbon emission calculation.
the total weight of main building materials involved in the calculation shall not be less than 95% of the total weight of building materials consumed by the building.
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Relevant standard provisions: 2.0.3 the carbon emission intensity of new residential and public buildings shall be reduced by an average of 40% based on the energy-saving design standards implemented in 2016, and the carbon emission intensity shall be reduced by more than 7kgco / (M.A).
The carbon emission in the production stage of building materials shall be determined according to the consumption of each main building material and its carbon emission factor.
