Fabricated steel structure building carbon emission calculation method and device based on BIM

Abstract

The invention discloses a BIM-based fabricated steel structure building carbon emission calculation method and device, and relates to the technical field of green building and intelligent building informationization, and the method comprises the steps: basic model construction: building a basic model of a building product by using Autodesk Revit software; construction of an engineering quantity model: establishing the engineering quantity model of the building product by using Guangdong BIM software; building an energy consumption model: building the energy consumption model of the building product by using GBS software; and carbon emission calculation: based on the engineering quantity model and the energy consumption model, calculating the carbon emission of the fabricated steel structure building by using Guangdi pricing software. According to the invention, the problem that the method for carbon emission measurement and calculation in the whole life cycle of the fabricated steel structure building is not perfect enough is solved, and the precision of carbon emission measurement and calculation of the whole project is improved; the problem that energy consumption generated in each stage of carbon emission calculation of the fabricated building is difficult to determine is solved, and the difficulty of carbon emission measurement and calculation in each stage is reduced.

Description

Technical Field

[0001] The present invention relates to the field of green building and intelligent building information technology, and in particular to a method and device for calculating carbon emissions of assembled steel structure buildings based on BIM. Background Art

[0002] With the rapid development of economy, energy and carbon emission consumption are increasing day by day, and carbon control and reduction have become the consensus of all countries. In this context, energy conservation and emission reduction in the construction industry is imperative, among which prefabricated steel structure buildings have received special attention due to their advantages such as short construction period, reduced construction waste, labor saving, and reduced carbon emissions.

[0003] Combining the carbon emission measurement of prefabricated steel structure buildings with BIM (Building Information Modeling) technology is expected to become one of the effective ways to achieve dynamic measurement and low-carbon management of carbon emissions in the construction industry.

[0004] At present, the research and theoretical system for the combination of BIM technology and carbon emission measurement of prefabricated steel structure buildings are still immature, and there are relatively few studies on carbon emission measurement for the entire life cycle of prefabricated steel structure buildings. The main problems to be solved are as follows: (1) Most of the studies focus on the carbon emission measurement in the prefabricated building construction stage, and there are fewer studies on the carbon emission measurement in the operation stage and the demolition and abandonment stage, which leads to a large deviation between the final carbon emission measurement results and the actual situation, affecting the accuracy of the carbon emission measurement of the overall project. (2) In the various stages of carbon emission calculation of prefabricated buildings, carbon emissions in the operation and demolition and abandonment stages are often difficult to measure, and there are many energy consumptions whose byproducts are not carbon dioxide. There is a lack of clear standards for the conversion between various energy consumptions and carbon emissions, making it difficult to measure energy consumption in some stages. Based on this, the present invention provides a method and device based on the combination of BIM technology and carbon emission measurement of prefabricated steel structure buildings. Summary of the invention

[0005] The purpose of the present invention is to provide a method and device for calculating carbon emissions of prefabricated steel structure buildings based on BIM. On the one hand, it solves the problem that the method for measuring and calculating carbon emissions in the entire life cycle of prefabricated steel structure buildings is not perfect, especially in the operation and demolition and abandonment stages, there is a lack of corresponding carbon emission calculation standards, and the accuracy of the overall project carbon emission measurement may be biased; on the other hand, it solves the problem that the energy consumption generated in each stage of the carbon emission calculation of prefabricated buildings is difficult to determine, and there is a lack of information technology support for building materials and energy consumption, which makes it difficult to infer the carbon emissions in some stages. To achieve the above purpose, the present invention provides the following technical solutions:

[0006] The first object of the present invention is to provide a method for calculating carbon emissions of prefabricated steel structure buildings based on BIM, the method comprising the following steps:

[0007] Basic model construction: Use Autodesk Revit software to build the basic model of the building product;

[0008] Construction of engineering quantity model: Based on the basic model, use Glodon BIM software to build the engineering quantity model of the building product;

[0009] Energy consumption model construction: Based on the basic model, use GBS software to establish the energy consumption model of building products;

[0010] Calculation of carbon emissions: Based on the engineering quantity model and the energy consumption model, the Glodon pricing software is used to calculate the carbon emissions of prefabricated steel structure buildings.

[0011] Furthermore, the entire life cycle of the prefabricated steel structure building includes five parts: building material production, building material transportation, construction and building, construction operation and demolition and abandonment stages.

[0012] Furthermore, the calculation formula for the carbon emissions of the entire life cycle of the prefabricated steel structure building is as follows:

[0013] C t =C sc +C ys +C jz +C use +(C cc -C rec );

[0014] In the formula, C t is the carbon emission of the whole life cycle, in tCO2e; C sc is the carbon emission in the building materials production stage, in tCO2e; C ys is the carbon emission in the building materials transportation stage, in tCO2e; C jz is the carbon emission during the construction phase, in tCO2e; C use is the carbon emissions during the construction and operation phase, in tCO2e; C cc is the carbon emission of the building demolition stage during the demolition and abandonment stage, in tCO2e; C rec It is the carbon emissions from the recycling of building materials during the demolition and abandonment phase, measured in tCO2e.

[0015] Furthermore, the construction of the engineering quantity model is specifically as follows:

[0016] Use the GFC plug-in in the Glodon BIM software to import the basic model established by the Autodesk Revit software into the Glodon civil engineering measurement platform, build the engineering quantity model, and then use the engineering quantity model to export the bill of quantities for each stage.

[0017] Furthermore, the energy consumption model is constructed as follows:

[0018] Use GBS software to read the published gbXML format file from the basic model built by Revit software and build an energy consumption model.

[0019] Furthermore, the formula for calculating carbon emissions during the building materials production stage is as follows:

[0020]

[0021] In the formula, C sc It is the carbon emission in the building materials production stage, in tCO2e. i is the consumption of the i-th building material, in t; F i is the carbon emission factor corresponding to the i-th building material, and its unit is tCO2e / unit quantity of building material.

[0022] Furthermore, the formula for calculating carbon emissions during the building materials transportation phase is as follows:

[0023]

[0024] In the formula, C ys is the carbon emission in the building materials transportation stage, in tCO2e; M i is the consumption of the i-th building material, in t; D i is the average transportation distance of the ith type of building material, in km; T i It is the carbon emission factor per unit weight and transportation distance under the i-th mode of construction material transportation, and its unit is kgCO2 / (t*km).

[0025] Furthermore, the calculation formula for carbon emissions during the construction phase is as follows:

[0026] C jz =Y*A;

[0027] Y = X + 1.99;

[0028] In the formula, C jz is the carbon emission during the construction phase, in tCO2e, X is the number of floors above ground, Y is the carbon emission per unit area, in kgCO2, and A is the total building area, in m 2 .

[0029] Furthermore, the calculation formula for carbon emissions during the construction and operation phase is as follows:

[0030]

[0031] In the formula, C use is the carbon emissions during the construction and operation phase, in tCO2e; i is the type of energy consumption, including electricity, etc.; j is the type of building energy consumption, including HVAC, lighting, etc.; E i,j is the energy consumption value of the i-th type of system of type j; ER i,j The energy of type i consumed by type j system that can be provided by renewable energy system; C p is the annual carbon reduction of the building green space carbon sink system, and y is the service life of the building.

[0032] Furthermore, the formula for carbon emissions during the building demolition phase in the demolition and abandonment phase is as follows:

[0033]

[0034] In the formula, C cc is the carbon emission of the building demolition stage during the demolition and abandonment stage, in tCO2e; E cc,i is the total consumption of the i-th energy during the building demolition phase, in kg or kWh; EF i is the carbon emission factor corresponding to the i-th energy source.

[0035] The second object of the present invention is to provide a BIM-based carbon emission calculation device for prefabricated steel structure buildings, the device comprising: a basic model construction module, an engineering quantity model construction module, an energy consumption model construction module and a carbon emission calculation module; wherein,

[0036] The basic model building module is used for basic model building: using Autodesk Revit software to build a basic model of the building product;

[0037] The engineering quantity model building module is used for engineering quantity model building: based on the basic model, the engineering quantity model of the building product is established using the Glodon BIM software;

[0038] The energy consumption model building module is used for energy consumption model building: based on the basic model, the energy consumption model of the building product is established using GBS software;

[0039] The carbon emission calculation module is used for carbon emission calculation: based on the engineering quantity model and the energy consumption model, the carbon emissions of the prefabricated steel structure building are calculated using the Glodon pricing software.

[0040] Technical effects and advantages of the present invention:

[0041] (1) The present invention proposes a method for measuring and calculating carbon emissions over the entire life cycle of prefabricated steel structure buildings, thereby improving the accuracy of carbon emissions measurement and calculation for the entire project.

[0042] (2) The present invention uses building information modeling technology to clarify the energy consumption generated in the process according to different material types and engineering requirements during the process of engineering quantity calculation, thereby reducing the difficulty of carbon emission measurement and calculation at each stage.

[0043] (3) The present invention helps to improve the low-carbon construction management level of prefabricated steel structure buildings, and can assist in predicting the carbon emissions of each link and component of the building during the design stage. For processes or building materials with concentrated carbon emissions, it can assist in modifying the design plan or construction organization, thereby achieving energy conservation and emission reduction and improving economic benefits.

[0044] Other features and advantages of the present invention will be described in the following description, and partly become obvious from the description, or be understood by implementing the present invention. The purpose and other advantages of the present invention can be realized and obtained by the structures pointed out in the description and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] 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 paying creative work.

[0046] Figure 1 A flow chart of a method for calculating carbon emissions during the entire life cycle of a prefabricated steel structure building provided by the present invention;

[0047] Figure 2 A schematic diagram of the concept of calculating carbon emissions during the entire life cycle of a prefabricated steel structure building based on BIM provided by the present invention;

[0048] Figure 3 A flow chart of a method for calculating carbon emissions of prefabricated steel structure buildings based on BIM provided by the present invention;

[0049] Figure 4 A bar chart showing the calculation results of carbon emissions of a comprehensive shift room over the entire life cycle provided by the present invention;

[0050] Figure 5 A schematic diagram of a BIM-based carbon emission calculation device for prefabricated steel structure buildings provided by the present invention. DETAILED DESCRIPTION

[0051] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only 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.

[0052] The present invention uses BIM technology to calculate the carbon emissions of prefabricated steel structure buildings over their entire life cycle. Figure 1 The flowchart of the method for calculating the carbon emissions of the prefabricated steel structure building during the entire life cycle provided by the present invention is as follows: Figure 1 As shown, the whole life cycle of prefabricated steel structure buildings includes five parts: building materials production, building materials transportation, construction, construction operation (construction operation), and demolition and abandonment. Among them, the calculation basis of carbon emissions in the building materials production stage is the carbon emission factor in the bill of quantities, the calculation basis of carbon emissions in the building materials transportation stage is the transportation distance, transportation method and carbon emission factor, the calculation basis of carbon emissions in the construction stage is the carbon emissions per unit area, the calculation basis of carbon emissions in the construction and operation stage is the lighting energy consumption, hot water energy consumption, air conditioning energy consumption and ventilator energy consumption, and the calculation basis of carbon emissions in the demolition and abandonment stage is the demolition carbon emissions per unit area and the building materials recycling carbon emission factor.

[0053] Figure 2 The schematic diagram of the carbon emission calculation concept of the prefabricated steel structure building based on BIM during the whole life cycle provided by the present invention is as follows: Figure 2 As shown, the present invention first uses Autodesk Revit software to establish a basic model of the building product, then imports the basic model into the Glodon model to generate a quantity model, and exports the quantity list of each stage, and then uses the Glodon cost software to link the corresponding carbon emission factor, combined with the energy consumption model constructed based on the basic model, and finally calculates the carbon emissions of each stage.

[0054] Further, Figure 3 The flowchart of the method for calculating carbon emissions of prefabricated steel structure buildings based on BIM provided by the present invention is as follows: Figure 3 As shown, the following are the specific steps for establishing each model and calculating carbon emissions:

[0055] Step S101: basic model construction:

[0056] Based on the market share and the compatibility status of various software, the present invention chooses to use Autodesk Revit software to establish the basic model of the building product. The model can be established according to the currently commonly used CAD drawings, and the compatibility of the model can ensure the rapid establishment of the model of the building at various stages (such as preliminary design, construction drawing design, completion design and other stages in the construction process), avoiding the increase in time cost and information asymmetry caused by reshaping the model.

[0057] Step S102: Construction of engineering quantity model:

[0058] The present invention chooses to use the Glodon BIM software to establish the bill of quantities of building products. The GFC (Global Foundation Classes, digital building data exchange standard) plug-in in the Glodon BIM software can import the basic model constructed by the Autodesk Revit software into the Glodon civil engineering measurement platform (GTJ2018) to construct a quantity model. The model can export the bill of quantities for each stage, which can be used for the calculation of carbon emissions in the stages of building materials production, building materials transportation, construction, construction operation, and demolition and abandonment.

[0059] Step S103: Energy consumption model construction:

[0060] Since GBS software has good interactivity with Revit software, GBS software can directly read the published gbXML format file from the basic model constructed by Revit software, and construct the energy consumption model on this basis. Therefore, the energy consumption of the building product in the construction and operation stage of the present invention can be converted using the energy consumption analysis software GBS (Green Building Studio) developed by Autodesk and the energy consumption model.

[0061] Step S104: Calculation of carbon emissions:

[0062] The calculation of carbon emissions is simulated with the help of Glodon Pricing Software. The established engineering quantity model is imported into the Glodon Pricing Software, and the relevant carbon emission factor database is linked to the corresponding engineering quantity list. Combined with the energy consumption model, the carbon emission results of the five stages of building materials production, building materials transportation, construction, construction operation, and demolition and abandonment can be calculated. The carbon emissions of prefabricated steel structure buildings throughout their life cycle are divided into the sum of the carbon emissions of the five stages, and the carbon emissions calculation formula is as follows:

[0063] C t =C sc +C ys +C jz +C use +(C cc -Crec ); (1)

[0064] In formula (1), C t is the carbon emission of the whole life cycle, in tCO2e; C sc is the carbon emission in the building materials production stage, in tCO2e; C ys is the carbon emission during the transportation of building materials, in tCO2e; C jz is the carbon emission during the construction phase, in tCO2e; C use is the carbon emission during the construction and operation phase, in tCO2e; C cc is the carbon emission of the building demolition stage during the demolition and abandonment stage, in tCO2e; C rec It is the carbon emission of building material recovery during the demolition and abandonment stage, measured in tCO2e.

[0065] Step S104.1: Calculation of carbon emissions during the building materials production phase

[0066] The materials used in this project mainly include construction steel, steel bars, concrete, cement mortar, masonry bricks, etc. The carbon emissions in this stage come from the carbon emissions in the production process of the construction materials of the project. Using the carbon emission coefficient method, the carbon emission calculation formula for the building materials production stage in Article 6.2.1 of the "Building Carbon Emission Calculation Standard" GB / T 51366-2019 is selected to calculate the carbon emissions in this stage. The calculation formula is as follows:

[0067]

[0068] In formula (2), C sc It is the carbon emission in the building materials production stage, in tCO2e. i is the consumption of the i-th building material, in units of t; through the construction drawings of the project, combined with Autodesk Revit software, BIM modeling is performed on the building used in the project to obtain the consumption of the building materials of the project. i is the carbon emission factor corresponding to the i-th main building material, in units of tCO2e / unit of building material quantity; in accordance with Appendix D of the "Building Carbon Emission Calculation Standard" GB / T51366-2019 and relevant literature reports, the carbon emission factor of building material production is selected. In addition, among the building materials selected for calculation, including the main structural materials and building components of the buildings in the project, the building materials with a weight share of less than 0.1% are not included in the calculation.

[0069] Step S104.2: Calculation of carbon emissions during the building materials transportation phase

[0070] The system boundary of this stage is from the factory of building materials to the construction site. The main source of carbon emissions in this stage is the energy consumption of transportation tools. According to the calculation formula of carbon emissions in the building materials transportation stage in Article 6.3.1 of the "Building Carbon Emission Calculation Standard" GB / T 51366-2019, the carbon emissions in this stage are calculated as follows:

[0071]

[0072] In formula (3), C ys is the carbon emission during the transportation of building materials, in tCO2e; M i is the consumption of the i-th building material, in t; D i is the average transportation distance of the ith type of building material, in km; T i It is the carbon emission factor per unit weight and transportation distance of the i-th mode of construction material transportation, in kgCO2 / (t*km).

[0073] Due to the lack of clear data on the transportation stage of building materials, such as the transportation methods and distances of various materials, the values ​​are taken in accordance with Appendix E of the "Building Carbon Emission Calculation Standard" GB / T51366-2019. The default average transportation distance of concrete is 40km, and the average transportation distance of other building materials is 500km. The transportation method is a light gasoline truck with a load capacity of 2t, and the loss value of building materials during transportation is 5%.

[0074] Step S104.3: Calculation of carbon emissions during construction phase

[0075] The carbon emission data of the construction phase of the project includes the carbon emissions generated during the construction of each building within the project and the carbon emissions generated during the implementation of the measures. It mainly considers the energy consumption of mechanical equipment, the processing energy consumption of some building materials and the carbon emissions generated by the work of construction personnel. The system boundary is from the start of the project to the completion acceptance. However, due to the lack of clear unit shift data during the construction phase, the empirical formula of the "Guidelines for Calculating Carbon Emissions in Buildings (Trial)" of the Guangdong Provincial Department of Housing and Urban-Rural Development is used to estimate the carbon emission data per unit area during the construction phase, and then the carbon emissions of the entire construction process are calculated based on the building area. The empirical formula is as follows:

[0076] Y=X+1.99; (4)

[0077] C jz =Y*A; (5)

[0078] In formula (4)-(5), C jzis the carbon emission during the construction phase, in tCO2e, Y is the carbon emission per unit area, in kgCO2, X is the number of floors above ground, A is the total building area, in m 2 .

[0079] Step S104.4: Calculation of carbon emissions during construction and operation

[0080] The carbon emissions during the construction and operation phase of the project are calculated based on the energy consumption during the construction and operation period, including HVAC, lighting energy consumption, domestic hot water energy consumption, and ventilator energy consumption. The carbon emissions calculation formula for this phase is:

[0081]

[0082] In formula (6), C use is the carbon emissions during the construction and operation phase, in tCO2e; i is the type of energy consumption, including electricity, etc.; j is the type of building energy consumption, including HVAC, lighting, etc.; E i,j is the energy consumption value of the i-th type of system of type j; ER i,j The energy of type i consumed by type j system that can be provided by renewable energy system; C p is the annual carbon reduction of the building green space carbon sink system, and y is the service life of the building.

[0083] Step S104.5: Calculation of carbon emissions during the demolition and abandonment phase

[0084] This stage includes two parts: building demolition and building material recycling. The sources of carbon emission data include energy consumption of machinery during demolition, waste transportation, etc. The calculation formula for carbon emissions during building demolition is:

[0085]

[0086] In formula (7), C cc is the carbon emission of the building demolition stage during the demolition and abandonment stage, in tCO2e; E cc,i is the total consumption of the i-th energy during the building demolition phase, in kg or kWh; EF i is the carbon emission factor corresponding to the i-th energy source.

[0087] Carbon emissions from the recycling of building materials during the demolition and abandonment phase C rec In accordance with the "Carbon Footprint of the Building Life Cycle", the building material recycling factor and recycling rate are selected, the transportation distance is defaulted to 10km, and the transportation mode category is defaulted to light gasoline truck transportation (load capacity 2t), and the total carbon emission reduction in the building material recycling stage is calculated.

[0088] Example

[0089] The present invention takes the comprehensive shift building of a certain project as an example to calculate the carbon emissions of prefabricated steel structure buildings based on BIM technology.

[0090] According to the two-dimensional design drawings, Autodesk Revit was selected to build the basic model of the building product. Combined with the Glodon BIM software, the calculation table information of the doors and windows table, standard floors, building material consumption, etc. of the comprehensive shift building can be exported. The following is the carbon emission calculation of each stage of the project's life cycle.

[0091] (1) Building materials production stage

[0092] The consumption data of building materials in the building materials production stage is obtained through modeling with Glodon BIM software, and the carbon emissions of the prefabricated project in the building materials production stage can be calculated by combining formula (2). Among them, the selection of carbon emission factors for building materials in the building materials production stage is carried out in accordance with GB / T51366-2019 "Building Carbon Emission Calculation Standard", as shown in Table 1.

[0093] Calculation example: The amount of steel bars required for the factory building is 1577.99t, and the production factor of steel bars is 2.34tCO2e / unit usage). The carbon emissions generated by this process are calculated as follows:

[0094] C sc =M 钢筋 *F 钢筋 =1577.99*2.34≈3692.51;

[0095] The carbon emissions generated by steel bars during the production of building materials are 3692.51tCO2e. Similarly, the carbon emissions of building materials required for other buildings during the production of building materials can be calculated. The carbon emission calculation results are shown in Table 2.

[0096] Table 1 Summary of carbon emission factors in the building materials production stage

[0097]

[0098]

[0099] Table 2 Summary of carbon emissions in the building materials production stage (comprehensive shift building)

[0100]

[0101] (2) Construction materials transportation stage

[0102] The values ​​are taken in accordance with Appendix E of the "Building Carbon Emission Calculation Standard" GB / T51366-2019, where the default average transportation mileage of concrete is 40km, the average transportation distance of other construction materials is 500km, and the transportation method is a light gasoline truck with a load capacity of 2t. The loss of each construction material during transportation is 5%.

[0103] Calculation example: The transport volume of steel bars is 52.997 tons, and the transport mode is a light gasoline truck (load 2 tons). The transport factor is 3.34×10 -4 [tCO2e / (t*km)], the transportation distance is 500km, then the carbon emission calculation formula for transporting this material is:

[0104] C=52.997*3.34*10 -4 *500≈8.850;

[0105] A 2-ton light gasoline truck is used to transport 1824.65 tons of steel bars over a distance of 500 km, and the carbon emissions generated during the transportation are 300.57 tCO2e. Similarly, the carbon emissions generated during the transportation of other building materials can be calculated. The calculation results of carbon emissions during the transportation of building materials are shown in Table 3.

[0106] Table 3 Summary of carbon emissions during the construction materials transportation phase (comprehensive shift building)

[0107]

[0108] (3) Construction phase

[0109] The carbon emissions of the comprehensive shift building construction phase of the prefabricated steel structure project were calculated according to formula (4) and formula (5), and the results are shown in Table 4.

[0110] Table 4 Summary of carbon emissions during construction phase

[0111]

[0112] (4) Construction and operation phase

[0113] The energy consumption during the building operation phase should be calculated according to formula (6). The energy consumption during the operation phase of the prefabricated steel structure project integrated shift building is simulated using the energy consumption analysis software GBS developed by Autodesk. The carbon emission calculation results during the construction and operation phase are shown in Table 5.

[0114] Table 5 Summary of carbon emissions during construction and operation phase

[0115]

[0116]

[0117] (5) Demolition and Abandonment Stage

[0118] The demolition data in this article calculates the engineering volume and energy consumption of the demolition phase in detail based on the construction organization ledger, construction organization plan, construction machinery list, etc.

[0119] Because there is no clear building demolition data, the demolition data in this article estimates the engineering volume or carbon emission data per unit area during the demolition phase based on the empirical formula and proportion estimation method of the "Guidelines for Calculating Building Carbon Emissions (Trial)" of the Guangdong Provincial Department of Housing and Urban-Rural Development.

[0120] Y = 0.06X + 2.01;

[0121] Where X is the number of aboveground layers, and Y is the carbon emissions per unit area, in units of tCO2 / m 2 .

[0122] The calculation results of carbon emissions during the demolition and abandonment stage are shown in Table 6.

[0123] Table 6 Summary of carbon emissions during building demolition phase

[0124]

[0125] In the recycling stage of construction, it is necessary to consider the recycling and reuse of building materials. For example, materials such as steel bars have a relatively high recycling value, and recycling can effectively reduce carbon emissions. By searching relevant standards and literature, the recycling factors and recycling rates of building materials are obtained as shown in Table 7.

[0126] Table 7 Data table of building materials recycling stage

[0127]

[0128]

[0129] The carbon emissions in the building materials recycling stage are determined by selecting the building materials recycling factor and recycling rate according to the table above. The transportation method, transportation distance and transportation carbon emission factor of the materials are selected according to Appendix B of "Carbon Footprint of the Entire Life Cycle of Buildings". The default data selected in this article are: the transportation distance defaults to 10km, and the transportation method category defaults to light gasoline truck transportation (load capacity 2t). The total carbon emission reduction in the building materials recycling stage is calculated.

[0130] Calculation example: The amount of steel bars used is 52.997t, the recyclability is 0.90, the recycling factor is 1.97tCO2e / unit, and when the mode of transportation is a 2t light gasoline truck with a transportation distance of 10km, the carbon emissions calculation results of recycled building materials are shown in Table 8 below.

[0131] The calculation is as follows:

[0132] C rec =52.997*0.9*1.97-52.997*0.00034*10≈93.787;

[0133] Table 8 Summary of carbon emissions in the building materials recycling stage

[0134]

[0135]

[0136] The calculation results of the carbon emissions of the prefabricated project's comprehensive shift housing over its entire life cycle are summarized in Table 9 and Figure 4 As shown:

[0137] Table 9 Summary of calculation results of carbon emissions over the entire life cycle

[0138]

[0139] The present invention also provides a BIM-based carbon emission calculation device for assembled steel structure buildings. Figure 5 A schematic diagram of a BIM-based carbon emission calculation device for assembled steel structure buildings provided by the present invention, such as Figure 5 As shown, the device includes: a basic model construction module 201, an engineering quantity model construction module 202, an energy consumption model construction module 203 and a carbon emission calculation module 204; wherein the basic model construction module 201 is used for basic model construction: using Autodesk Revit software to establish a basic model of a building product; the engineering quantity model construction module 202 is used for engineering quantity model construction: based on the basic model, using Glodon BIM software to establish an engineering quantity model of a building product; the energy consumption model construction module 203 is used for energy consumption model construction: based on the basic model, using GBS software to establish an energy consumption model of a building product; the carbon emission calculation module 204 is used for carbon emission calculation: based on the engineering quantity model and the energy consumption model, using Glodon pricing software to calculate the carbon emissions of prefabricated steel structure buildings.

[0140] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for calculating carbon emissions of prefabricated steel structure buildings based on BIM, characterized in that: The method comprises the following steps: Basic model construction: Use Autodesk Revit software to build the basic model of the building product; Construction of engineering quantity model: Based on the basic model, use Glodon BIM software to build the engineering quantity model of the building product; Energy consumption model construction: Based on the basic model, use GBS software to establish the energy consumption model of building products; Calculation of carbon emissions: Based on the engineering quantity model and the energy consumption model, the Glodon pricing software is used to calculate the carbon emissions of prefabricated steel structure buildings.

2. According to the BIM-based carbon emission calculation method for prefabricated steel structure buildings according to claim 1, it is characterized in that: The entire life cycle of the prefabricated steel structure building includes five parts: building materials production, building materials transportation, construction, construction operation and demolition and abandonment stages.

3. The method for calculating carbon emissions of prefabricated steel structure buildings based on BIM according to claim 2 is characterized in that: The calculation formula for the carbon emissions of the prefabricated steel structure building throughout its life cycle is as follows: C t =C sc +C ys +C jz +C use +(C cc -C rec ); In the formula, C t is the carbon emission of the whole life cycle, in tCO2e; C sc is the carbon emission in the building materials production stage, in tCO2e; C ys is the carbon emission in the building materials transportation stage, in tCO2e; C jz is the carbon emission during the construction phase, in tCO2e; C use is the carbon emissions during the construction and operation phase, in tCO2e; C cc is the carbon emission of the building demolition stage during the demolition and abandonment stage, in tCO2e; C rec It is the carbon emissions from the recycling of building materials during the demolition and abandonment phase, measured in tCO2e.

4. The method for calculating carbon emissions of prefabricated steel structure buildings based on BIM according to claim 1 is characterized in that: The construction of the engineering quantity model is specifically as follows: Use the GFC plug-in in the Glodon BIM software to import the basic model established by the Autodesk Revit software into the Glodon civil engineering measurement platform, build the engineering quantity model, and then use the engineering quantity model to export the bill of quantities for each stage.

5. The method for calculating carbon emissions of prefabricated steel structure buildings based on BIM according to claim 1 is characterized in that: The energy consumption model is constructed as follows: Use GBS software to read the published gbXML format file from the basic model built by Revit software and build an energy consumption model.

6. The method for calculating carbon emissions of prefabricated steel structure buildings based on BIM according to claim 3 is characterized in that: The formula for calculating carbon emissions in the building materials production stage is as follows: In the formula, C sc It is the carbon emission in the building materials production stage, in tCO2e. i is the consumption of the i-th building material, in t; F i is the carbon emission factor corresponding to the i-th building material, and its unit is tCO2e / unit quantity of building material.

7. The method for calculating carbon emissions of prefabricated steel structure buildings based on BIM according to claim 3 is characterized in that: The formula for calculating carbon emissions during the construction materials transportation phase is as follows: In the formula, C ys is the carbon emission in the building materials transportation stage, in tCO2e; M i is the consumption of the i-th building material, in t; D i is the average transportation distance of the ith type of building material, in km; T i It is the carbon emission factor per unit weight and transportation distance under the i-th mode of construction material transportation, and its unit is kgCO2 / (t*km).

8. The method for calculating carbon emissions of prefabricated steel structure buildings based on BIM according to claim 3 is characterized in that: The calculation formula for carbon emissions during the construction phase is as follows: C jz =Y*A; Y = X + 1.99; In the formula, C jz is the carbon emission during the construction phase, in tCO2e, X is the number of floors above ground, Y is the carbon emission per unit area, in kgCO2, and A is the total building area, in m 2 .

9. The method for calculating carbon emissions of prefabricated steel structure buildings based on BIM according to claim 3 is characterized in that: The calculation formula for carbon emissions during the construction and operation phase is as follows: In the formula, C use is the carbon emissions during the construction and operation phase, in tCO2e; i is the type of energy consumption, including electricity, etc.; j is the type of building energy consumption, including HVAC, lighting, etc.; E i,j is the energy consumption value of the i-th type of system of type j; ER i,j The energy of type i consumed by type j system that can be provided by renewable energy system; C p is the annual carbon reduction of the building green space carbon sink system, and y is the service life of the building.

10. The method for calculating carbon emissions of prefabricated steel structure buildings based on BIM according to claim 3, characterized in that: The formula for carbon emissions during the building demolition phase in the demolition and abandonment phase is as follows: In the formula, C cc is the carbon emission of the building demolition stage during the demolition and abandonment stage, in tCO2e; E cc,i is the total consumption of the i-th energy during the building demolition phase, in kg or kWh; EF i is the carbon emission factor corresponding to the i-th energy source.

11. A BIM-based carbon emission calculation device for prefabricated steel structure buildings, characterized in that: The device comprises: a basic model construction module, an engineering quantity model construction module, an energy consumption model construction module and a carbon emission calculation module; wherein, The basic model building module is used for basic model building: using Autodesk Revit software to build a basic model of the building product; The engineering quantity model building module is used for engineering quantity model building: based on the basic model, the engineering quantity model of the building product is established using the Glodon BIM software; The energy consumption model building module is used for energy consumption model building: based on the basic model, the energy consumption model of the building product is established using GBS software; The carbon emission calculation module is used for carbon emission calculation: based on the engineering quantity model and the energy consumption model, the carbon emissions of the prefabricated steel structure building are calculated using the Glodon pricing software.

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