A building carbon footprint accounting system based on localization dynamic factors
By constructing a localized dynamic emission factor database and performing precise factor calculations, the bias issues caused by regional and technological differences in building carbon footprint accounting have been resolved. This has enabled accurate accounting of the carbon footprint of building projects throughout their entire life cycle and determination of carbon sinks, thereby improving the scientific nature of green building assessments and the potential for assetization.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- GUIZHOU UNIV
- Filing Date
- 2026-01-30
- Publication Date
- 2026-06-23
AI Technical Summary
Existing building carbon footprint accounting systems rely on static, standardized emission factor databases, which fail to reflect regional and technological differences in a timely manner. This leads to discrepancies between the accounting results and actual emissions, making it impossible to effectively assess the potential carbon impact of special materials. Consequently, the environmental benefits assessment of materials and the overall carbon balance characterization of building projects are affected.
A localized dynamic emission factor database is constructed, which is combined with a building project data extraction module, a carbon footprint accounting module, a solid waste-based building material carbon benefit calculation module, and a net carbon flow accounting module. Through dynamic updates and accurate factor calculations, the carbon emissions and carbon benefits of building materials throughout their entire life cycle are quantified, enabling the determination of the net carbon flow of building projects.
It improved the accuracy and reliability of accounting results, scientifically assessed the net carbon contribution of solid waste-based building materials throughout their entire life cycle, identified and assetized the potential carbon sink value of buildings, and enhanced the tradability of green building projects.
Smart Images
Figure CN122264262A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of carbon footprint accounting technology, specifically to a building carbon footprint accounting system based on localized dynamic factors. Background Technology
[0002] Building carbon footprint accounting is a crucial tool for assessing the environmental impact of buildings and supporting the industry's low-carbon transformation. Currently, this field primarily relies on established, standardized emission factor databases for calculations. These databases are typically built based on industry-level average data, with factors that are relatively fixed over time and lack sufficient segmentation in terms of region and application scenario. In practical applications, the accounting process often directly references these general factors and combines them with the project's material usage list for calculation. Because the underlying data upon which the accounting is based fails to incorporate the actual differences and dynamic changes in energy structures, specific production processes, and supply chains across different regions, a systematic deviation exists between the final accounting results and the actual emissions of building projects, limiting the accuracy of the results and their guiding value for specific projects. The modeling boundaries and measurement logic of existing accounting frameworks mainly focus on identifying and quantifying explicit carbon emission sources, lacking an effective assessment and integration path for the potential carbon impact of indirect emission processes that may arise from the composition characteristics or usage of building materials themselves. This makes it difficult for existing accounting systems to capture and reflect the substantial carbon impact that some materials with special environmental properties can bring throughout the entire building life cycle. This not only affects the fair evaluation of the environmental benefits of materials, but also limits the integrity of the accounting results in representing the overall carbon balance of the building project. Summary of the Invention
[0003] To achieve the above objectives, this invention proposes a building carbon footprint accounting system based on localized dynamic factors, comprising: Localized dynamic emission factor database: used to build and maintain a database storing carbon emission factors of various building materials, including direct emission factors, indirect emission factors, and upstream and downstream emission factors; Construction Project Data Extraction Module: Used to extract the building material list and usage data of each building material from the building information model and construction plan data of the target construction project; Carbon footprint accounting module: The carbon footprint accounting module is configured as follows: Receive the building material list and usage data from the building project data extraction module; for each building material in the building material list, obtain the corresponding carbon emission factor from the localized dynamic emission factor database module; based on the obtained carbon emission factors and the corresponding building material usage data, calculate the preliminary carbon footprint data of the target building project. The solid waste-based building materials carbon benefit calculation module is used to calculate the carbon avoidance benefits generated by the solid waste-based building materials by replacing natural raw materials and the carbonization and carbon sequestration benefits generated by carbonization reaction during long-term use when the building materials list includes solid waste-based building materials. The net carbon flow calculation module is communicatively connected to the carbon footprint calculation module and the solid waste-based building materials carbon benefit calculation module; the net carbon flow calculation module is configured as follows: Receive preliminary carbon footprint data and the carbon avoidance benefits and carbon sequestration benefits; subtract the carbon avoidance benefits and carbon sequestration benefits from the preliminary carbon footprint to obtain the net carbon emissions of the target building project; wherein, if the net carbon emissions are negative, it is determined that the target building project forms a carbon sink.
[0004] Preferably, the localized dynamic emission factor database further includes: the localized dynamic emission factor database continuously collects actual energy consumption data and material balance data from the corresponding building material production links in the construction industry chain through a data interface; the actual energy consumption data includes electricity consumption data and fuel consumption data measured by smart meters and fuel flow meters at the production site; the material balance data includes raw material input and product output data recorded through enterprise resource planning or manufacturing execution systems; based on this continuously collected actual data, the localized dynamic emission factor database, for each type of building material, according to the specific characteristics clearly identified in its data records... The production area code and production process route code are used to perform dedicated carbon emission factor calculations. The localized dynamic emission factor database has an embedded dynamic update program. When the dynamic update program detects policy adjustments or market changes in the energy structure of a production area through data stream monitoring, or when a production process undergoes technological transformation with emission reduction effects, the dynamic update program triggers a recalculation process of the carbon emission factors corresponding to the affected building materials based on the newly collected actual energy consumption and material balance data, and iteratively updates the calculation results to the corresponding records in the localized dynamic emission factor database, thereby realizing the dynamism of carbon emission factors.
[0005] Preferably, the calculation and determination process of the direct emission factor is further refined as follows: For each type of building material under specific production regions and process routes, the system extracts data packets corresponding to multiple continuous or discrete production batches from the continuously collected actual energy consumption and material balance data; for each production batch data packet, the total CO2 emissions of the production process of that batch are parsed out. and the quality of qualified building materials produced in this batch. Subsequently, for each batch, the formula is applied... A calculation is performed to obtain an initial value representing the direct emission factor of the batch. After obtaining initial values for multiple batches, the system calls a data cleaning and analysis subroutine. This subroutine uses statistical methods, such as calculating the standard deviation and mean of all initial values, to identify and remove outlier data that deviates significantly from the normal range due to production equipment start-up and shutdown, sudden failures, or short-term anomalies in metering sensors. After removing outlier data, the system performs a weighted average calculation on the remaining valid initial batch values to finally determine the direct emission factor of the building material under the production conditions. The weights are allocated based on the production scale of each batch or the quality confidence label attached to the data package itself, so that data from large-scale stable production batches or calibrated and verified data have a higher proportion in the final factor, thereby ensuring the representativeness and robustness of the factor.
[0006] Preferably, the calculation process of the indirect emission factor further includes: for each building material production batch, the system extracts the total electricity consumption value P of the entire production process covered by the actual energy consumption data of that batch; simultaneously, the system accesses externally dynamically updated regional power grid carbon intensity data based on the production location identifier and precise production start and end timestamps carried in the batch data; by matching the region and time period, the system obtains the regional power grid carbon intensity factor that completely corresponds to the production batch and reflects the power grid emission level at that time. Then, the system uses the formula Perform a calculation to obtain the indirect emission factor corresponding to this batch of building materials. The indirect emission factor is essentially the total carbon emissions corresponding to the electricity consumed in producing this batch of building materials. Since the regional power grid carbon intensity factor will be dynamically adjusted with the change of the proportion of thermal power, hydropower, wind power and other power sources in the power structure of the region, the calculated indirect emission factor also has dynamic attributes and can reflect the changes in carbon emission intensity at the power production end in a timely manner.
[0007] Preferably, the upstream and downstream emission factors include two parts: upstream transportation emission factors and downstream waste disposal emission factors. For the upstream transportation emission factors, the system analyzes the associated raw material purchase orders and logistics tracking information for each batch of building materials recorded in the actual energy consumption and material balance data, extracts the actual transportation distance D of various raw materials from the supplier's location to the production plant, and identifies the main fuel type used by the transportation vehicle. Then, based on the fuel type, the system queries the fuel emission coefficient table to obtain the CO2 equivalent released per unit distance of combustion corresponding to that fuel. According to the formula The system calculates the emission factor generated during the transportation of this batch of raw materials, which can be allocated to a unit mass of building materials. This is used as the upstream transportation emission factor for the building materials. For the downstream waste disposal emission factor, the system first determines the main post-waste disposal method, such as landfill, incineration, or recycling, based on the product technical specifications of the building materials. Then, according to the disposal method, the system queries the life cycle assessment database or industry standards and specifications to obtain the CO2 equivalent released per unit mass of waste material when treated under the specified disposal method. According to the formula The downstream waste disposal emission factors of the building material can then be obtained; among which... The system calculates the emission factors for upstream transportation and downstream waste disposal, and then arithmetically sums the calculated emission factors for upstream transportation and downstream waste disposal to obtain the complete upstream and downstream emission factors for the building material, thus covering indirect emissions from raw material acquisition and product disposal stages within the accounting boundary.
[0008] Preferably, the carbon footprint accounting module's calculation of preliminary carbon footprint data further includes: the carbon footprint accounting module first classifies the received building material list by usage stage, and according to the main function of each building material in the building life cycle, classifies its usage data into the physicalization stage, operation stage, or disposal stage; for example, the usage of structural concrete and steel bars is classified into the physicalization stage; the usage of lamps and insulation materials replaced during the operation period is classified into the operation stage; and the usage of the original building materials corresponding to the construction waste generated during demolition is associated with the disposal stage; after the classification is completed, the carbon footprint accounting module sends a request to the localized dynamic emission factor database for each building material i classified in the same stage to obtain the direct emission factor required for its assessment in the context of that stage. Indirect emission factors Upstream transportation emission factors and downstream waste disposal emission factors Next, for each building material i, the module performs the core operation: first, it sums the four acquired factors to obtain the unit comprehensive emission coefficient of the building material, and then it multiplies this coefficient by the amount of the building material used. Calculate the individual carbon footprint of this building material, i.e. Finally, the module initiates a summary function that iterates through all building materials across all stages, summing up the calculated individual carbon footprints for each item, strictly adhering to the formula. The preliminary carbon footprint (CF) data of the target building project is obtained.
[0009] Preferably, the process of calculating carbon avoidance benefits and carbon sequestration benefits by the solid waste-based building materials carbon benefit calculation module specifically includes: when calculating carbon avoidance benefits, the solid waste-based building materials carbon benefit calculation module first determines the substitution ratio of a certain natural raw material based on the material property data of the solid waste-based building materials, for example, one ton of granulated blast furnace slag can replace 0.95 tons of silicate cement clinker; subsequently, the module retrieves the weighted average unit carbon emission factor of the replaced natural raw material from the localized dynamic emission factor database. And the unit carbon emission factor of the solid waste building material itself. Then, based on the total usage of the solid waste-based building material in the project and the aforementioned replacement ratio, the module calculates the mass of the equivalent natural raw materials replaced by it. According to the formula The module precisely quantifies the carbon emissions avoided by using solid waste-based building materials. When calculating carbon sequestration benefits, the module first identifies solid waste-based building materials belonging to the magnesium cementitious material category in the building materials list and obtains their total usage. Simultaneously, the module extracts the building's design service life (T) from the project's basic information provided by the building project data extraction module. By obtaining long-term average environmental parameters of the project location and based on the material carbonization reaction kinetic model, the module determines the annual carbonization rate (r) of the magnesium cementitious material under these environmental conditions. Finally, based on the formula... The total amount of carbon dioxide that the magnesium cementitious material can absorb and fix through carbonization reaction during the entire service life of the building was calculated, i.e., the total carbon sequestration benefit. The mass of the magnesium cementitious material.
[0010] Preferably, the final steps of the net carbon flow accounting module in calculating and determining the net carbon emissions of the target building project specifically include: the module first receiving a data stream from the upstream module, including preliminary carbon footprint data (CF) and carbon avoidance benefits output by the solid waste-based building materials carbon benefit calculation module. With carbonization and carbon sequestration benefits Before the core calculation begins, the module performs a data validation step, checking whether all input data values are within a reasonable range, whether data fields are complete, and whether they carry a unique identifier traceable to the original data source or calculation module; after successful validation, the net carbon flow calculation module calculates the net carbon flow according to the formula. Performing the calculation, this formula is equivalent to The net carbon emission (NC) is calculated. The module's built-in judgment logic then activates: if the NC calculation result is negative, the system automatically marks the target building project as a carbon sink project, determining that it has formed a carbon sink; simultaneously, a structured net carbon flow accounting report is generated, which includes at least the project's unique identifier, the calculated net carbon emission value, a clear carbon sink project marking status, and a timestamp for this accounting. As a process compatibility design, if the building materials list provided by the building project data extraction module does not contain any solid waste-based building materials, the solid waste-based building materials carbon benefit calculation module will output... and The value is automatically set to zero, and the net carbon flow accounting module calculates according to the same NC formula. At this time, NC equals CF, and the system only completes the basic life cycle carbon footprint accounting and reporting functions.
[0011] This invention provides a building carbon footprint accounting system based on localized dynamic factors, which has the following beneficial effects: 1. This invention replaces the static macro-average factor by constructing and applying a continuously updated, regionally segmented localized dynamic emission factor database, thereby solving the problem of significant deviations between building carbon footprint accounting results and actual emissions due to differences in region, technology, and energy structure, thus improving the accuracy and reliability of the accounting results.
[0012] 2. Based on this, the present invention solves the problem that traditional accounting systems cannot scientifically assess the net carbon contribution of such materials throughout their entire life cycle by quantifying the carbon avoidance benefits and carbon sequestration benefits of solid waste-based building materials, thereby improving the scientificity and completeness of the environmental benefit assessment of low-carbon building materials.
[0013] 3. This invention integrates accurate accounting and carbon benefit data to establish a building carbon sink determination and certification mechanism based on negative net carbon emissions. This solves the core problem that the building sector has long been regarded as a pure emission source, and its potential carbon sink value cannot be identified and assetized, thereby increasing the possibility of converting green building projects into tradable carbon assets. Attached Figure Description
[0014] Figure 1 A schematic diagram of the process of this invention. Detailed Implementation
[0015] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.
[0016] refer to Figure 1This invention provides a building carbon footprint accounting system based on localized dynamic factors. This system integrates a localized dynamic emission factor database, a building project data extraction module, a carbon footprint accounting module, a solid waste building material carbon benefit calculation module, and a net carbon flow accounting module. This enables accurate and dynamic accounting of the carbon footprint of a building project throughout its entire lifecycle, and scientifically quantifies the carbon avoidance and carbon sequestration benefits of solid waste building materials. Ultimately, it generates net carbon emission data for the building project, providing technical support for carbon sink identification and carbon asset management. The invention will now be described in detail with reference to specific embodiments.
[0017] The system of this invention first establishes and maintains a localized dynamic emission factor database. This localized dynamic emission factor database continuously collects actual energy consumption data and material balance data from the building material production process in the construction industry chain through a data interface. The actual energy consumption data includes real-time electricity and fuel consumption measured by smart meters and fuel flow meters at the production site. The material balance data comes from raw material input and product output recorded in the enterprise resource planning system or manufacturing execution system. For each type of building material, the system performs a dedicated carbon emission factor calculation based on the production region code and production process route code clearly marked in its data records. For example, for ordinary silicate cement, if it is produced from a specific production line in North China, the system will use the actual production data corresponding to that production line in that region for factor calculation. The calculation process for direct emission factors involves analyzing the data packets of multiple consecutive production batches of the building material under specific production conditions, analyzing the total carbon dioxide emissions of each batch's production process and the quality of qualified building materials produced in that batch, and then applying the formula... Calculate the initial value of the direct emission factor for each batch; where Direct emission factor , The total CO2 emissions (kg) from the production process. The system first calculates the building material mass (kg). Then, it calls the data cleaning and analysis subroutine to use statistical methods to identify and remove outliers caused by production start-up / shutdown or equipment failure. For example, if the initial value of the direct emission factor of a certain batch deviates from the average of all batches by more than two standard deviations, the data will be considered an outlier and removed. After removal, the system performs a weighted average of the initial values of the remaining valid batches. The weights are set according to the production scale of each batch, with larger batches having higher weights. This yields the final direct emission factor of the building material under the production region and process.
[0018] The calculation of indirect emission factors is closely linked to the real-time carbon intensity of the regional power grid. For each production batch, the system extracts the total electricity consumed from the actual energy consumption data. Simultaneously, based on the production location identifier and precise production timestamp for that batch, it accesses an externally updated regional power grid carbon intensity database to obtain the power grid carbon intensity factor matching that region and time period. For example, assuming a batch of cement was produced in the East China power grid coverage area during the third quarter of 2023, the system obtains the average carbon intensity factor of the East China power grid for that period. It is 0.55 kg of carbon dioxide equivalent per kilowatt-hour; then according to the formula The indirect emission factor for this batch was calculated; P represents the electricity consumption during the building materials production process; since the energy structure of the regional power grid changes over time, for example, an increase in the proportion of renewable energy will reduce the carbon intensity factor of the power grid, the indirect emission factor calculated based on this is dynamic and can reflect the actual changes in carbon emission intensity at the electricity production end.
[0019] For upstream and downstream emission factors, the system breaks them down into upstream transportation emission factors and downstream waste disposal emission factors. When calculating the upstream transportation emission factor, the system analyzes the raw material procurement logistics information associated with each batch of building materials, extracting the actual transportation distance and fuel type of various raw materials. For example, when calculating the upstream transportation emission factor of a batch of steel, the system identifies that its iron ore raw material was transported from a mine in Shanxi to a steel plant in Hebei by heavy-duty diesel trucks, a transportation distance of 500 kilometers. A query of the fuel emission coefficient table reveals that the carbon dioxide equivalent per unit distance for heavy-duty diesel trucks is 0.15 kg of carbon dioxide equivalent per kilometer. Based on the formula... The emission factors during the transportation phase of this batch of steel raw materials were calculated; among which... For transport distance (km), The CO2 equivalent per unit distance of fuel combustion (kg CO2 / km) is used. The determination of downstream waste disposal emission factors is based on the product specifications of building materials and the pre-set waste disposal scenario. For example, for ordinary concrete, assuming it is disposed of by landfill, the industry standard database shows that the CO2 equivalent generated by landfill disposal per unit mass of concrete is 0.01 kg CO2 equivalent per kilogram. If the future waste material mass corresponding to this batch of concrete is 1000 kg, then according to the formula... The emission factors of its waste disposal were calculated; among which Waste material mass (kg) Carbon dioxide equivalent per unit mass of waste Finally, the upstream transportation emission factors and the downstream waste disposal emission factors of the building material are summed to obtain the complete upstream and downstream emission factors. All calculated emission factors are stored in a structured manner according to the type of building material, production region, process route and time version, forming a localized dynamic emission factor database that can be dynamically queried and updated.
[0020] The building project data extraction module is responsible for automatically extracting building material lists and usage data of each building material from the building information model (BIM) file and construction plan document of the target building project. This module can identify the component types and material information in the model and associate them with the bill of quantities. For example, for an office building project, the building project data extraction module extracts the types, strength grades, and volume or mass data of building materials such as concrete, steel bars, and masonry blocks used in components such as walls, floors, beams, and columns from its BIM model. At the same time, it obtains the usage information of building materials such as doors and windows, insulation materials, and decorative surfaces from the construction plan. The extracted data is organized into a structured building material list. Each item in the list includes the building material identification, usage, unit of measurement, and the system's preset usage stage based on its usage scenario, namely the materialization stage, operation stage, or disposal stage. For example, the usage of concrete and steel bars used in the main structure is classified into the materialization stage, the usage of light fixtures and air conditioning filters planned to be replaced during the operation period is classified into the operation stage, and the original building material usage corresponding to the construction waste generated during the building demolition stage is associated with the disposal stage.
[0021] After receiving the building material list and usage data from the construction project data extraction module, the carbon footprint accounting module initiates the accounting process. First, for each building material in the list, the carbon footprint accounting module requests the localized dynamic emission factor database based on its identifier and usage stage to obtain the corresponding direct emission factors, indirect emission factors, upstream transportation emission factors, and downstream waste disposal emission factors. For example, when calculating the carbon footprint of C30 grade concrete used in the physicalization stage, the carbon footprint accounting module will query the database for various carbon emission factors of C30 concrete produced near the project location using mainstream processes. After obtaining the carbon emission factors, for each building material, the core carbon footprint calculation is performed, namely… Where CF represents the project's total carbon footprint. CO), These are the fourth category emission factors for the i-th type of building material. The amount of this building material used Assuming the comprehensive emission coefficient of C30 concrete is 300 kg CO2 equivalent per cubic meter, and the project uses 500 cubic meters, then the individual carbon footprint of this concrete is 300 multiplied by 500, which equals 150,000 kg CO2 equivalent. The module iterates through all building materials, calculates their individual carbon footprints one by one, and finally sums up all individual carbon footprints based on... Preliminary carbon footprint data for the target building project was obtained.
[0022] The solid waste-based building materials carbon benefit calculation module is activated when the system identifies solid waste-based building materials in the building materials list. This module mainly quantifies two types of benefits: carbon avoidance benefits and carbon sequestration benefits. When calculating carbon avoidance benefits, the module first determines the substitution ratio of solid waste-based building materials to natural raw materials based on their material property data. For example, when fly ash is used as a concrete admixture, it is set that each ton of fly ash can replace 0.95 tons of silicate cement clinker. Subsequently, the module retrieves the unit carbon emission factor of the replaced natural raw materials, namely silicate cement clinker, and the unit carbon emission factor of fly ash itself, from the localized dynamic emission factor database. Assuming the unit carbon emission factor of silicate cement clinker is 850 kg CO2 equivalent per ton, and the unit carbon emission factor of fly ash is 250 kg CO2 equivalent per ton; if the project uses 200 tons of fly ash, then the equivalent mass of cement clinker replaced by it is 200 multiplied by 0.95, which equals 190 tons. According to the formula... The calculated carbon avoidance benefit is kilograms of carbon dioxide equivalent; of which To avoid carbon emissions, To replace material quality, Carbon emission factor per unit of natural materials The carbon emission factor per unit of solid waste-based materials.
[0023] When calculating the carbon sequestration benefits, the solid waste-based building materials carbon benefit calculation module first identifies whether the building materials list includes magnesium cementitious materials, such as magnesium oxide cement. After obtaining the total usage, the module extracts the design service life of the building from the basic project information provided by the building project data extraction module, assuming it is T=50 years. Simultaneously, the solid waste-based building materials carbon benefit calculation module obtains the long-term average environmental parameters of the project location, such as the annual average temperature and relative humidity, and determines the annual carbonization rate r of the magnesium cementitious material under these environmental conditions based on the material carbonization reaction kinetic model. For example, by fitting experimental data with the model, the annual carbonization rate of the material under a certain environment is determined to be 0.005 kg of carbon dioxide fixed per kilogram of material per year. If the usage of magnesium cementitious material in the project is 10,000 kg, then according to the formula... The total carbon sequestration benefit over its 50-year service life is calculated to be 2,500 kg of carbon dioxide equivalent.
[0024] The net carbon flow calculation module, as the final integration and judgment stage, sequentially receives preliminary carbon footprint data from the carbon footprint calculation module, and carbon avoidance benefit and carbon sequestration benefit data from the solid waste-based building materials carbon benefit calculation module. Before the core calculation begins, the module performs a data verification step, checking whether the values of all input data are within a preset reasonable range, such as whether the carbon emission factor is positive and whether the building material usage is non-negative, while also verifying the completeness of data fields and the traceability of source identification. After verification, the calculation is performed according to the formula... The calculation is performed as follows: Assuming the initial carbon footprint calculation result for an office building project is 500,000 kg CO2 equivalent, the carbon avoidance benefit is 114,000 kg CO2 equivalent, and the carbon sequestration benefit is 2,500 kg CO2 equivalent, then the net carbon emissions are 383,500 kg CO2 equivalent. The system's built-in judgment logic is then activated. If the net carbon emissions calculation result is negative, the system automatically marks the target building project as a carbon sink project, determining that it has formed a carbon sink. Regardless of whether it is a carbon sink project, the system will generate a structured net carbon flow accounting report, which includes the project's unique identifier, net carbon emissions value, carbon sink project marking status, and accounting timestamp. As a process compatibility design, if the building materials list provided by the building project data extraction module is found to contain no solid waste-based building materials, then the carbon avoidance benefit and carbon sequestration benefit values output by the solid waste-based building materials carbon benefit calculation module are automatically set to zero. The net carbon flow accounting module calculates according to the same formula. At this time, the net carbon emissions equal the initial carbon footprint, and the system completes the full life cycle carbon footprint accounting and reporting function.
[0025] Through the above specific implementation methods, the present invention system realizes a complete technical closed loop from dynamic data acquisition, accurate factor calculation, full-stage carbon footprint accounting, carbon benefit quantification of special building materials to net carbon flow determination and report generation; the system ensures the accuracy of the accounting basis through a localized and dynamic factor library, enhances the scientificity and completeness of the assessment by introducing carbon avoidance and carbon sequestration benefit quantification methods, and finally provides a reliable technical basis for identifying and assetizing the potential carbon sink value of building projects through net carbon flow accounting.
[0026] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.
Claims
1. A building carbon footprint accounting system based on localized dynamic factors, characterized in that, include: Localized dynamic emission factor database: used to build and maintain a database storing carbon emission factors of various building materials, including direct emission factors, indirect emission factors, and upstream and downstream emission factors; Construction Project Data Extraction Module: Used to extract the building material list and usage data of each building material from the building information model and construction plan data of the target construction project; Carbon footprint accounting module: The carbon footprint accounting module is configured as follows: Receive the building material list and usage data from the building project data extraction module; for each building material in the building material list, obtain the corresponding carbon emission factor from the localized dynamic emission factor database module; based on the obtained carbon emission factors and the corresponding building material usage data, calculate the preliminary carbon footprint data of the target building project. The solid waste-based building materials carbon benefit calculation module is used to calculate the carbon avoidance benefits generated by the solid waste-based building materials by replacing natural raw materials and the carbonization and carbon sequestration benefits generated by carbonization reaction during long-term use when the building materials list includes solid waste-based building materials. The net carbon flow calculation module is communicatively connected to the carbon footprint calculation module and the solid waste-based building materials carbon benefit calculation module; the net carbon flow calculation module is configured as follows: Receive preliminary carbon footprint data and the carbon avoidance benefits and carbon sequestration benefits; subtract the carbon avoidance benefits and carbon sequestration benefits from the preliminary carbon footprint to obtain the net carbon emissions of the target building project; wherein, if the net carbon emissions are negative, it is determined that the target building project forms a carbon sink.
2. The building carbon footprint accounting system based on localized dynamic factors according to claim 1, characterized in that: The localized dynamic emission factor database includes: continuously collecting actual energy consumption and material balance data of corresponding building material production links in the construction industry chain through a data interface; the actual energy consumption data includes electricity consumption metering data and fuel consumption at the production site; the material balance data includes raw material input and product output; based on the collected actual energy consumption and material balance data, for each type of building material, according to its specific production region and process route, the carbon emission factor of the building material is calculated and generated separately, wherein the direct emission factor is calculated based on the material balance data and carbon emission metering data during the production process, and the indirect emission factor is calculated based on the electricity consumption metering data and the regional power grid carbon intensity factor of the production region; when a change in the energy structure of a certain production region or a technological transformation of the production process is detected, the corresponding carbon emission factor of the affected building material is recalculated and iteratively updated based on the newly collected actual energy consumption and material balance data.
3. The building carbon footprint accounting system based on localized dynamic factors according to claim 2, characterized in that: The process of calculating the direct emission factor based on material balance data and carbon emission measurement data during the production process includes: for each type of building material, under the production region and process route, obtaining the total CO2 emissions of the corresponding multiple production batches from the actual energy consumption and material balance data. and the quality of the building materials corresponding to this batch For each production batch, according to the formula The initial value of the direct emission factor for this batch is calculated. Then, the initial values of the direct emission factors for multiple batches are statistically analyzed to remove outlier data caused by production start-up and shutdown, equipment failure or metering anomalies. The weighted average of the remaining valid initial values of the batches is used as the final direct emission factor of the building material under the production conditions. The weights are determined based on the production scale or data quality confidence level of each batch.
4. The building carbon footprint accounting system based on localized dynamic factors according to claim 2, characterized in that: The process for obtaining the indirect emission factor includes: for each batch of building materials production, extracting the total electricity consumed (P) during its production process from the actual energy consumption data; simultaneously, based on the production location identifier and production time period of that batch, calling and associating with an externally dynamically updated regional power grid carbon intensity database to obtain the regional power grid carbon intensity factor matching that production location and time period. According to the formula The indirect emission factor of this batch of building materials can be directly calculated. This factor characterizes the indirect carbon emission intensity corresponding to the electricity consumption per unit of production; the indirect emission factor varies with the regional power grid energy structure.
5. A building carbon footprint accounting system based on localized dynamic factors according to claim 2, characterized in that: The upstream emission factors include upstream transportation emission factors and downstream waste disposal emission factors. The upstream transportation emission factors include: for each batch of building materials recorded in the actual energy consumption and material balance data, analyzing its raw material procurement logistics information, extracting the actual transportation distance D of various raw materials and the fuel type used by the transportation vehicles; then, querying the corresponding CO2 equivalent per unit distance based on the fuel type. According to the formula The emission factor per unit mass generated during the transportation of this batch of raw materials is calculated and used as its upstream transportation emission factor; the downstream waste disposal emission factor is determined as follows: based on the product specifications of the building material and the waste disposal scenario, the CO2 equivalent of its unit mass of waste material under the specified disposal method is obtained. According to the formula The waste disposal emission factor per unit mass of building materials is calculated and used as its downstream waste disposal emission factor; whereby... The quality of waste materials is determined by summing the upstream transportation emission factors and the downstream waste disposal emission factors of the building material to form the upstream and downstream emission factors of the building material.
6. The building carbon footprint accounting system based on localized dynamic factors according to claim 1, characterized in that: The carbon footprint accounting module calculates preliminary carbon footprint data as follows: Each building material in the building materials list is categorized according to its usage stage in the construction project into the physicalization stage, operation stage, or disposal stage; then, for each building material categorized within the same usage stage, its corresponding direct emission factor is extracted from the localized dynamic emission factor database. Indirect emission factors Upstream transportation emission factors and downstream waste disposal emission factors Next, for each building material i, perform the calculation. The carbon footprint of this building material during its respective use phase was obtained, among which... This represents the usage amount of the building material; finally, the carbon footprint of all building materials across all stages of the building project is summed according to the formula. The preliminary carbon footprint (CF) data of the target building project is obtained.
7. A building carbon footprint accounting system based on localized dynamic factors according to claim 1, characterized in that: The process of calculating carbon avoidance benefits and carbon sequestration benefits in the solid waste-based building materials carbon benefit calculation module includes: when calculating carbon avoidance benefits, determining the unit mass substitution relationship between the solid waste-based building materials and the natural raw materials being replaced, based on the material property data of the solid waste-based building materials; and retrieving the unit carbon emission factors of the replaced natural raw materials from the localized dynamic emission factor database. and the unit carbon emission factor of the solid waste-based building materials. According to the formula Calculate carbon avoidance benefits, where The carbon sequestration benefit is calculated by multiplying the amount of solid waste building materials used by the unit mass substitution relationship; when calculating the carbon sequestration benefit, the amount of magnesium cementitious material used in solid waste building materials is obtained from the building project data extraction module, and the design life information of the target building project is analyzed to determine its full life cycle T; long-term environmental parameter data of the location of the target building project are obtained, and the annual carbonization rate r corresponding to the environmental parameters and material ratio is determined; according to the formula Calculate its total carbon sequestration benefits, of which The mass of the magnesium cementitious material.
8. A building carbon footprint accounting system based on localized dynamic factors according to claim 1, characterized in that, The process by which the net carbon flow accounting module calculates the net carbon emissions of the target building project includes: sequentially receiving preliminary carbon footprint data, and carbon avoidance benefits from the solid waste-based building materials carbon benefit calculation module. With carbonization and carbon sequestration benefits The data integrity and source identification are verified; after verification, the data is then processed according to the formula. Calculations are performed to obtain the net carbon emission (NC). If the calculated NC is negative, the target building project is marked as a carbon sink project, and a net carbon flow accounting report containing the project identifier, net carbon emission value, marking status, and calculation timestamp is generated. If the building materials list does not include solid waste-based building materials, then... and The value is assigned to zero, and then the calculation is performed according to the NC formula.