Fabricated building carbon label calculation method and system based on BIM

Abstract

The invention provides a BIM-based fabricated building carbon label calculation method and system, and belongs to the technical field of building carbon labels. The fabricated building carbon label calculation method based on the BIM comprises the steps that S01, BIM model information is associated with whole life cycle information, and the whole life cycle is divided into a plurality of stages; s02, acquiring configuration data of static carbon labels of the BIM model components; s03, dynamic data of net carbon emission and carbon offset of the fabricated building are obtained; s04, calculating a carbon emission result of the fabricated building in real time based on the BIM model; s05, displaying a carbon emission calculation result of the carbon emission of the fabricated building by taking components and the whole as units; s06, corresponding electronic carbon labels are given according to the carbon emission result of the fabricated building; and S07, authenticating and supervising the electronic carbon tag. According to the method, the BIM model adopts an import and modification mode, so that timely response of information can be ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of building carbon labels, and in particular to a method and system for calculating carbon labels for assembled buildings based on BIM. Background Art

[0002] The purpose of carbon labeling is to mitigate climate change, reduce greenhouse gas emissions, promote low-carbon emission technologies, and indicate the greenhouse gas emissions emitted by commodities during the production process on product labels with a quantitative index, so as to inform consumers of the carbon information of products in the form of labels. Prefabricated buildings refer to buildings assembled on site with prefabricated components. At a time when energy conservation and environmental protection are emphasized, the construction industry needs to make necessary contributions to energy conservation and emission reduction. Therefore, it is also necessary to conduct carbon emission environmental assessments based on the links related to carbon emissions of prefabricated buildings, and assign corresponding carbon label information to prefabricated buildings based on the carbon emission results.

[0003] In order to respond to the international community's call to control greenhouse gas emissions, the carbon emissions status of my country's future prefabricated buildings should be labeled.

[0004] At present, the issuance of carbon labels for prefabricated building carbon emissions usually involves manual statistics, aggregation and calculation of various carbon emission data in prefabricated buildings, and the corresponding carbon labels are distributed according to the calculation results. Since the statistical period of paper carbon labels is one year, they can only statically represent the carbon emissions of the past year, and cannot conduct corresponding real-time supervision based on the real-time dynamic carbon emission data of prefabricated building construction and operation, which is not conducive to the healthy and stable development of prefabricated buildings.

[0005] BIM is the abbreviation of Building Information Modeling, which is a method of building design, construction and management based on digital technology. It integrates all aspects of building design, construction and management into one model through digital technology. This model can contain information on building structure, decoration, equipment, materials, etc. In BIM buildings, designers, construction workers, material suppliers and other related personnel can work together on the same platform to edit and view building models in real time, thereby improving communication efficiency, reducing errors, and better coordinating various links.

[0006] BIM can be used as a comprehensive management platform to integrate the operating data of various building systems, helping managers to find problems in a timely manner and take corresponding measures. Therefore, how to use BIM to build a dynamic data system that can realize building carbon labeling is a technology urgently needed by the industry. Summary of the invention

[0007] In order to solve the problems mentioned in the background technology, the present invention adopts a full life cycle electronic carbon label for prefabricated buildings based on BIM to form a dynamic electronic carbon label, and a BIM-based prefabricated building carbon label calculation method and system for real-time supervision of carbon emissions of prefabricated buildings.

[0008] Specifically:

[0009] A method for calculating carbon label of prefabricated buildings based on BIM, including:

[0010] S01: Associate BIM model information with the full life cycle information, which is divided into several stages;

[0011] S02: Obtain the configuration data of the static carbon label of the BIM model component;

[0012] S03: Obtain dynamic data on net carbon emissions and carbon offsets of prefabricated buildings;

[0013] S04: Real-time calculation of carbon emissions of prefabricated buildings based on BIM model;

[0014] S05: Display the carbon emission calculation results of prefabricated buildings in terms of components and the whole;

[0015] S06: Assign corresponding electronic carbon labels based on the carbon emission results of prefabricated buildings;

[0016] S07: Certify and monitor electronic carbon labels.

[0017] Furthermore, the entire life cycle in S01 is divided into seven stages, consisting of the material preparation stage, component production stage, component operation stage, component assembly stage, building operation and maintenance stage, component transformation and reuse stage, and component dismantling and reuse stage.

[0018] Furthermore, the total carbon emissions of prefabricated buildings over their entire life cycle are the sum of the carbon emissions in the seven stages.

[0019] Furthermore, the configuration data in S02 consists of the carbon footprint of the prefabricated building and the credit certificate;

[0020] Carbon footprint of prefabricated buildings includes carbon footprint model, carbon calculation tool and carbon footprint report;

[0021] The credit certificate includes carbon information, carbon quota, carbon credit, green building star rating, ultra-low energy consumption building, near-zero energy consumption building, and carbon dioxide capture, utilization or storage.

[0022] Furthermore, the dynamic data of net carbon emissions in S03 include the total net carbon emissions of the prefabricated building as a whole in its entire life cycle, the net carbon emissions of the prefabricated building as a whole at each stage of its entire life cycle, the total net carbon emissions of each prefabricated building component in its entire life cycle, and the net carbon emissions of each prefabricated building component in its entire life cycle;

[0023] Dynamic data on carbon offsets include carbon emission reductions from purchased emission reduction projects, carbon sinks, and the use of renewable energy.

[0024] Furthermore, the carbon emission result of prefabricated buildings in S04 is the dynamic data of net carbon emissions minus the dynamic data of carbon offsets.

[0025] Furthermore, in S05, the total numerical results of the carbon emissions of the prefabricated building as a whole and the numerical calculation results at each stage of its life cycle are displayed in real time and dynamically on the BIM model; the numerical results of the carbon emissions calculation of each prefabricated building component during its life cycle are written into the shared parameters of the component.

[0026] Furthermore, the types of electronic carbon labels assigned in S06 are divided into overall carbon emissions of prefabricated buildings and carbon emissions of prefabricated building components.

[0027] Furthermore, the certification unit of the electronic carbon label in S07 needs to be stamped with an official seal, which will be displayed on the dynamic carbon label certificate.

[0028] On the other hand, the present invention also provides a BIM-based prefabricated building carbon label calculation system, which includes a full life cycle carbon label calculation module, a component dynamic data acquisition module, a carbon label generation module and a certification module;

[0029] The full life cycle carbon label calculation module package is used to calculate the carbon emissions of a single prefabricated building based on its components and generate comprehensive component carbon emission data;

[0030] The component dynamic data acquisition module is used to perform real-time dynamic calculations on the acquired component carbon emission comprehensive data to generate carbon emission calculation results for the prefabricated building as a whole and its components;

[0031] The carbon label generation module is used to dynamically generate component carbon labels and prefabricated building carbon labels according to the carbon emission calculation results, and to determine whether the annual carbon emissions in the operation and maintenance stage of the prefabricated building carbon label are qualified;

[0032] The authentication module is used to display the dynamic carbon label authentication certificate, and the dynamic carbon label certificate is printed with the official seal of the authentication unit.

[0033] Compared with the prior art, the present invention has the following beneficial features:

[0034] 1. Buildings emit large amounts of greenhouse gases during their life cycle, which has adverse effects on the ecological environment. Compared with ordinary products, due to their long life cycle and complex structure, the evaluation methods, life cycle stage divisions, and carbon emission source definitions are different, resulting in great differences in research results. Based on this, the present invention takes into account that the various stages of prefabricated buildings vary due to different carbon emission sources, and the corresponding carbon emissions also vary greatly. Therefore, it is necessary to consider and calculate each stage separately. The BIM-based prefabricated building carbon label calculation method can achieve carbon emission data for single prefabricated buildings and components covering the material preparation stage; component production stage; operation stage; assembly stage; operation and maintenance stage; transformation and reuse stage; demolition and reuse stage. The carbon emissions of prefabricated buildings adopt the weighted summation mode of carbon emissions of each component at different stages of the entire life cycle, which improves work efficiency and convenience while ensuring accuracy.

[0035] 2. The present invention takes into account that the carbon in the project boundary green space belongs to the category of carbon sink in the entire life cycle of the building, which will have a certain offset effect on carbon emissions. Therefore, the carbon source and carbon offset are comprehensively considered to make the calculation of carbon emissions of prefabricated buildings more accurate.

[0036] 3. The BIM-based prefabricated building carbon label calculation method of the present invention can realize the calculation of carbon emission data over the entire life cycle of the building, and integrate the BIM model with the import and modification mode, which not only improves work efficiency and convenience, but also ensures accuracy. At the same time, the building's electronic dynamic carbon label is composed of component carbon emissions and building carbon emissions (one-year accounting period), which can ensure timely response of information, allowing users to directly judge the carbon information status of the building through vision, and quickly obtain carbon information by scanning the code, helping prefabricated buildings to achieve healthy and stable development of low-carbon and zero-carbon. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. The positional relationships described in the drawings in the following description are based on the directions in which the components are drawn in the diagrams, unless otherwise specified.

[0038] Figure 1 A flow chart of a BIM-based prefabricated building carbon label calculation method and system provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0039] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in combination with the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0040] The present invention provides a method for calculating the carbon label of prefabricated buildings based on BIM, comprising:

[0041] S01: Associate BIM model information with the full life cycle information, which is divided into several stages;

[0042] S02: Obtain the configuration data of the static carbon label of the BIM model component;

[0043] S03: Obtain dynamic data on net carbon emissions and carbon offsets of prefabricated buildings;

[0044] S04: Real-time calculation of carbon emissions of prefabricated buildings based on BIM model;

[0045] S05: Display the carbon emission calculation results of prefabricated buildings in terms of components and the whole;

[0046] S06: Assign corresponding electronic carbon labels based on the carbon emission results of prefabricated buildings;

[0047] S07: Certify and monitor electronic carbon labels.

[0048] Specifically, the whole life cycle is divided into seven stages, which are material preparation stage, component production stage, component operation stage, component assembly stage, building operation and maintenance stage, component transformation and reuse stage, and component dismantling and reuse stage. Therefore, from the perspective of the whole life cycle, the calculation model of the building carbon label is shown in formula (1):

[0049] E q =E cl +E gj +E yz +E zp +E yw +E gz +E cc (1)

[0050] In the formula, E q —Total carbon emissions over the entire life cycle (kgCO2e);

[0051] E cl —Carbon emissions during material preparation (kgCO2e);

[0052] E gj —Carbon emissions during component production (kgCO2e);

[0053] E yz —Carbon emissions during component operation (kgCO2e);

[0054] E zp —Carbon emissions during component assembly (kgCO2e);

[0055] E yw —Carbon emissions during building operation and maintenance (kgCO2e);

[0056] E gz —Carbon emissions from component transformation and reuse (kgCO2e);

[0057] E cc —Carbon emissions from component dismantling and reuse (kgCO2e).

[0058] According to this formula, the total carbon emissions of each prefabricated building component over its entire life cycle can be calculated, and the total carbon emissions of the prefabricated building as a whole over its entire life cycle can be obtained by adding up the calculated results of each prefabricated building component.

[0059] 1. Material preparation stage

[0060] The carbon emissions from the production process of building materials, including steel bars, concrete, cement, sand and gravel, are calculated according to formula (2):

[0061]

[0062] In the formula, CL is the usage of unit material component;

[0063] i—i represents the type of material component;

[0064] EF cl,i —Carbon emission factor of the i-th building material component;

[0065] 2. Component production stage

[0066] Carbon emissions during the component production stage are mainly caused by the coal, gas and oil, electricity and other energy consumed during the factory manufacturing process. Since the loss of building materials has been taken into account in the building budget, the loss is not taken into account in the calculations in this article. During the component production stage of a building, carbon emissions are calculated according to formula (3):

[0067]

[0068] Where, m is the amount of energy consumed in producing building components;

[0069] i—i represents the type of energy consumed;

[0070] EF m,i —Carbon emission factor of the i-th energy source;

[0071] 3. Component operation stage

[0072] The carbon emissions generated during transportation are shown in formula (4):

[0073]

[0074] In the formula, k i —The weight of the transported building material of type i (t);

[0075] L i —Transportation distance of the i-th type of building material (km);

[0076] EF i —Carbon emission factor per unit weight and unit distance of transportation (kgCO2e / (t·km)).

[0077] 4. Component assembly stage

[0078] During the construction process, the use of various construction equipment consumes electricity, diesel and other energy sources, which generates carbon emissions. The calculation of carbon emissions can be seen in formula (5):

[0079]

[0080] In the formula, TB i —Number of machine shifts for the i-th type of machine (each continuous working hour is one shift);

[0081] i—represents the type of shift;

[0082] EF i —Carbon emission factor per unit shift of the i-th type of machinery (kgCO2e / shift).

[0083] 5. Building operation and maintenance stage

[0084] The operation and maintenance stage is the main stage that reflects the functions of the building, including the carbon emissions of related equipment systems such as heating, cooling, lighting, hot water supply, household appliances, green space carbon sinks, and the use of clean energy. Its carbon emissions are mainly reflected in the use of electricity, gas and water. The calculation of its carbon emissions can be seen in formula (6):

[0085] E yw =E ps -E th -E qj (6)

[0086] In the formula, E ps- The operation and maintenance phase includes carbon emissions from related equipment systems including heating, cooling, lighting, hot water supply, and household appliances, calculated as in formula (7);

[0087] E th - Carbon emissions from green land carbon sinks within the building red line;

[0088] E qj - The building uses clean energy to reduce carbon emissions;

[0089] in:

[0090]

[0091] In the formula, NY i —Annual consumption of the i-th energy source in the use phase;

[0092] i—represents the type of energy consumed;

[0093] EF i —Annual consumption of the i-th energy source during the use phase.

[0094]

[0095] Where M i —The amount of carbon sinks in green areas;

[0096] i—Types of green land carbon sinks;

[0097] TH i —Emission factors of green space carbon sinks.

[0098]

[0099] Where D i —Amount of electricity generated using renewable energy;

[0100] i—Types of renewable energy;

[0101] EF i —The carbon emission factor for electricity in the region where the building is located.

[0102] 6. Component transformation and reuse stage

[0103] The calculation of carbon emissions during the transformation and reuse stage can be seen in formula (10):

[0104] E gz =E ch +E qt +E hs (10)

[0105] In the formula, E ch —Carbon emissions from component dismantling (kgCO2e), calculated according to Formula 11;

[0106] E qt —Carbon emissions from material preparation to assembly of components (kgCO2e), calculated according to Formula 12;

[0107] E hs —Carbon emissions (kgCO2e) generated by component recycling and re-production are calculated according to Formula 13.

[0108]

[0109] In the formula, CNY i —The energy consumption of the i-th type of component removal activity;

[0110] EF i —Carbon emission factor of the ith energy source.

[0111] E qt =E cl +E gj +E yz +E zp (12)

[0112] In the formula, E cl —Carbon emissions during the material preparation stage (kgCO2e), calculated according to Formula 2;

[0113] E gj —Carbon emissions during component production (kgCO2e), calculated according to Formula 3;

[0114] E yz —Carbon emissions during component operation (kgCO2e), calculated according to Formula 4;

[0115] E zp —Carbon emissions during component assembly (kgCO2e), calculated according to Formula 5;

[0116]

[0117] Where, m—energy consumed by the recovery construction;

[0118] i—represents the type of energy;

[0119] EF i —Carbon emission factor represented by energy.

[0120] 7. Dismantling and Reusing Components

[0121] After the life of a building ends, it is demolished. The demolition machinery consumes electricity and fuel during the demolition, resulting in carbon emissions. This also includes carbon emissions during the transportation of demolition waste to the landfill. Reuse mainly consists of two links: one is the carbon emissions caused by the energy consumption of mechanical equipment during the recycling process, and the other is the offset of carbon emissions from recycled building materials. Since mechanical equipment consumes little energy, this paper ignores its role and focuses on carbon offset from recycled building materials. For construction waste, my country currently adopts recyclable and non-recyclable treatment methods. For most non-recyclable building materials, after they are dismantled, they will be transported to the garbage disposal site for landfill or incineration, and only the transportation process is counted. For recyclable building materials, they can be recycled. As a new material, they enter the life cycle of the new building again without causing actual environmental impact, resulting in carbon emissions being offset.

[0122] E cc =E ch +E yz +E hs (14)

[0123] In the formula, E ch —Carbon emissions from component dismantling (kgCO2e), calculated according to formula (11);

[0124] E yz —Carbon emissions during component operation (kgCO2e), calculated according to formula (4);

[0125] E hs —Carbon emissions from component recycling and re-production (kgCO2e), calculated according to formula (13).

[0126] The above introduces the carbon emissions of seven stages respectively. The component data of the design simulation stage (plan) can be extracted or estimated based on the building design model, etc.; the actual stage data are all calculated based on the actual data of the building.

[0127] Specifically, the dynamic data of net carbon emissions in S03 include the total net carbon emissions of the prefabricated building as a whole in the whole life cycle, the net carbon emissions of the prefabricated building as a whole at each stage of the whole life cycle, the total net carbon emissions of each prefabricated building component in the whole life cycle, and the net carbon emissions of each prefabricated building component in the whole life cycle. Net carbon emissions are calculated using the above formula.

[0128] Specifically, the carbon emission result of prefabricated buildings in S04 is the dynamic data of net carbon emissions minus the dynamic data of carbon offsets. Through this method, it can be based on:

[0129] The total carbon emissions of the prefabricated building in its entire life cycle are calculated by deducting the carbon offset value from the total net carbon emissions of the prefabricated building in its entire life cycle;

[0130] The carbon emissions of the prefabricated building as a whole at each stage of its life cycle can be calculated by deducting the carbon offset value from the net carbon emissions of the prefabricated building as a whole at each stage of its life cycle.

[0131] The total net carbon emissions of each prefabricated building component over its entire life cycle can be calculated by deducting the carbon offset value from the total net carbon emissions of each prefabricated building component over its entire life cycle;

[0132] The net carbon emissions of each prefabricated building component over its entire life cycle can be calculated by subtracting the carbon offset value from the net carbon emissions of each prefabricated building component over its entire life cycle.

[0133] Specifically, in S06, the types of electronic carbon labels assigned are divided into overall carbon emissions of prefabricated buildings and carbon emissions of components;

[0134] The overall carbon emissions of prefabricated buildings are in the form of a bar graph (the horizontal axis represents the operation and maintenance stage, and the vertical axis represents the carbon emissions), which is divided into 7 areas, each corresponding to a stage of the entire life cycle; the operation and maintenance stage increases annually, and when the annual carbon emissions in the operation and maintenance stage are unqualified (exceeding the carbon emission quota of the building), the corresponding area is red, and when the annual carbon emissions in the operation and maintenance stage are qualified, the corresponding area is green;

[0135] The carbon emissions of components are in the form of QR codes, and the carbon emissions at each stage of the life cycle are written into the QR code corresponding to the component; users can view the carbon emissions of each component throughout its life cycle by scanning the QR code on the component.

[0136] The following is further described in conjunction with the embodiments:

[0137] Example

[0138] Take campus buildings as an example. Figure 1 As shown, a method for calculating the carbon label of prefabricated buildings based on BIM includes the following steps:

[0139] S01: Link BIM model information with full life cycle information

[0140] In step S01, the entire life cycle of the prefabricated building is divided into seven stages and the corresponding calculation method is proposed: material preparation stage; component production stage; operation stage; assembly stage; operation and maintenance stage; transformation and reuse stage; and dismantling and reuse stage.

[0141] S02: Obtain the configuration data of carbon labels for BIM model components

[0142] The configuration data of the static carbon label of prefabricated buildings consists of the carbon footprint of prefabricated buildings and the credit certificate. The campus carbon footprint includes the carbon footprint model, carbon calculation tool and carbon footprint report. The credit certificate includes campus carbon information, carbon quota, carbon credit, green building star rating, ultra-low energy consumption building, near-zero energy consumption building and carbon dioxide capture, utilization or storage.

[0143] S03: Obtain dynamic data on net carbon emissions and carbon offsets of prefabricated buildings

[0144] In step S03, the dynamic data of net carbon emissions include carbon emissions in seven stages: material preparation stage; component production stage; component operation stage; component assembly stage; building operation and maintenance stage; component transformation and reuse stage; and component dismantling and reuse stage.

[0145] In step S03, the dynamic data of carbon offsets includes carbon emission reductions from purchased emission reduction projects, carbon sinks, and renewable energy use;

[0146] S04: Real-time calculation of carbon emissions of prefabricated buildings based on BIM model

[0147] In step S04, the campus carbon emission result is calculated as A, the campus net carbon emission is calculated as B, and the campus carbon offset is calculated as C. The calculation formula of the campus carbon emission result is: A=BC;

[0148] S05: Differentiate and display the campus carbon emission calculation results;

[0149] The carbon emission calculation results of prefabricated buildings are displayed in terms of components and as a whole.

[0150] In step S05, the total numerical results of carbon emissions of prefabricated buildings and the numerical calculation results of each stage of the whole life cycle are displayed in real time on the BIM model; the numerical results of carbon emissions calculation of each component throughout its life cycle are written into the shared parameters of the component, among which the carbon emissions generated by cooling and heating during the operation and maintenance stage are displayed on an annual basis;

[0151] S06: Assign corresponding electronic carbon labels based on the carbon emission results of prefabricated buildings

[0152] In step S06, the types of electronic carbon labels assigned are divided into overall carbon emissions of prefabricated buildings and carbon emissions of components;

[0153] The overall carbon emissions of prefabricated buildings are in the form of a bar graph (the horizontal axis represents the operation and maintenance stage, and the vertical axis represents the carbon emissions), which is divided into 7 areas, each corresponding to a stage of the entire life cycle; the operation and maintenance stage increases annually, and when the annual carbon emissions in the operation and maintenance stage are unqualified (exceeding the carbon emission quota of the building), the corresponding area is red, and when the annual carbon emissions in the operation and maintenance stage are qualified, the corresponding area is green;

[0154] The component carbon emissions are in the form of QR codes, and the carbon emissions at each stage of the life cycle are written into the QR code corresponding to the component; users can view the carbon emissions of each component throughout its life cycle by scanning the QR code on the component;

[0155] S07: Certification and supervision of electronic carbon labels

[0156] In step S07, the certification unit of the electronic carbon label needs to be stamped with an official seal, and the stamped official seals can include multiple units, which are displayed on the dynamic carbon label certificate to increase the certification unit's sense of responsibility and public supervision.

[0157] The present invention also provides a BIM-based prefabricated building carbon label calculation system, comprising: a full life cycle carbon label calculation module, a component dynamic data acquisition module, a carbon label generation module and a certification module;

[0158] The full life cycle carbon label calculation module is used to calculate the carbon emissions of a single prefabricated building based on its components, and obtain the comprehensive carbon emissions data of the components after processing;

[0159] The component dynamic data acquisition module is used to perform real-time dynamic calculation on the acquired component carbon emission comprehensive data to generate;

[0160] The carbon label generation module is used to dynamically generate component carbon labels and prefabricated building carbon labels, and to determine whether the annual carbon emissions in the operation and maintenance phase of the prefabricated building carbon label are qualified;

[0161] The certification module is used to display the certification seal of the dynamic carbon label certificate, thereby increasing the sense of responsibility of the certification unit and the supervision of the public.

[0162] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for calculating carbon labels for prefabricated buildings based on BIM, characterized in that: include: S01: Associate BIM model information with the full life cycle information, which is divided into several stages; S02: Obtain the configuration data of the static carbon label of the BIM model component; S03: Obtain dynamic data on net carbon emissions and carbon offsets of prefabricated buildings; S04: Real-time calculation of carbon emissions of prefabricated buildings based on BIM model; S05: Display the carbon emission calculation results of prefabricated buildings in terms of components and the whole; S06: Assign corresponding electronic carbon labels based on the carbon emission results of prefabricated buildings; S07: Certify and monitor electronic carbon labels.

2. The carbon label calculation method for prefabricated buildings based on BIM according to claim 1 is characterized in that: The entire life cycle of S01 is divided into seven stages, including material preparation stage, component production stage, component operation stage, component assembly stage, building operation and maintenance stage, component transformation and reuse stage, and component dismantling and reuse stage.

3. The method for calculating carbon labels for prefabricated buildings based on BIM according to claim 2, characterized in that: The total carbon emissions of prefabricated buildings throughout their life cycle are the sum of the carbon emissions in the seven stages.

4. The method for calculating carbon labels for prefabricated buildings based on BIM according to claim 1, characterized in that: The configuration data in S02 consists of the carbon footprint and credit certificate of the prefabricated building; Carbon footprint of prefabricated buildings includes carbon footprint model, carbon calculation tool and carbon footprint report; The credit certificate includes carbon information, carbon quota, carbon credit, green building star rating, ultra-low energy consumption building, near-zero energy consumption building, and carbon dioxide capture, utilization or storage.

5. The method for calculating carbon labels for prefabricated buildings based on BIM according to claim 1, characterized in that: The dynamic data of net carbon emissions in S03 include the total net carbon emissions of the prefabricated building as a whole in its entire life cycle, the net carbon emissions of the prefabricated building as a whole at each stage of its entire life cycle, the total net carbon emissions of each prefabricated building component in its entire life cycle, and the net carbon emissions of each prefabricated building component in its entire life cycle; Dynamic data for carbon offsets include carbon reductions from purchased emission reduction projects, carbon sinks, and the use of renewable energy.

6. The method for calculating carbon labels for prefabricated buildings based on BIM according to claim 1, characterized in that: The carbon emission result of prefabricated buildings in S04 is the dynamic data of net carbon emissions minus the dynamic data of carbon offsets.

7. The method for calculating carbon labels for prefabricated buildings based on BIM according to claim 1, characterized in that: In S05, the total numerical results of the carbon emissions of the prefabricated building as a whole and the numerical calculation results at each stage of its life cycle are displayed in real time and dynamically on the BIM model; the numerical results of the carbon emissions calculation of each prefabricated building component during its life cycle are written into the shared parameters of the component.

8. The method for calculating carbon labels for prefabricated buildings based on BIM according to claim 1, characterized in that: The types of electronic carbon labels assigned in S06 are divided into overall carbon emissions of prefabricated buildings and carbon emissions of prefabricated building components.

9. The method for calculating carbon labels for prefabricated buildings based on BIM according to claim 1, characterized in that: In S07, the certification unit of the electronic carbon label needs to be stamped with an official seal, which will be displayed on the dynamic carbon label certificate.

10. A BIM-based prefabricated building carbon label calculation system, characterized in that: It includes a full life cycle carbon label calculation module, a component dynamic data collection module, a carbon label generation module and a certification module; The full life cycle carbon label calculation module package is used to calculate the carbon emissions of a single prefabricated building based on its components and generate comprehensive component carbon emission data; The component dynamic data acquisition module is used to perform real-time dynamic calculations on the acquired component carbon emission comprehensive data to generate carbon emission calculation results for the prefabricated building as a whole and its components; The carbon label generation module is used to dynamically generate component carbon labels and prefabricated building carbon labels according to the carbon emission calculation results, and to determine whether the annual carbon emissions in the operation and maintenance stage of the prefabricated building carbon label are qualified; The authentication module is used to display the dynamic carbon label authentication certificate, and the dynamic carbon label certificate is printed with the official seal of the authentication unit.

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