Carbon dioxide emission calculation system, method, and program

Abstract

The present invention provides a carbon dioxide emission calculation system, method, and program that can more accurately determine the CO2 emissions of a product even when the product is manufactured over multiple periods. [Solution] In a factory capable of manufacturing multiple types of products that are produced from raw materials through multiple processes, a carbon dioxide emission calculation system for determining the CO2 emissions of a target product during a target period among several different periods calculates the total emissions of raw materials for the beginning work-in-process products, the total emissions of raw materials for the ending work-in-process products, and the total emissions of raw materials for the period for products at the start of production during the target period. The difference between the total emissions of beginning work-in-process and the total emissions of ending work-in-process is added to or subtracted from the total emissions for the period according to the relationship between the total emissions of beginning work-in-process and the total emissions of ending work-in-process to determine the net CO2 emissions of raw materials during the target period and the CO2 emissions to be allocated to the target product.

Description

Technical Field

[0001] The present invention relates to a carbon dioxide emission calculation system, a carbon dioxide emission calculation method, and a carbon dioxide emission calculation program for obtaining the amount of carbon dioxide emissions of raw materials of products manufactured through a plurality of processes.

Background Art

[0002] In recent years, from the perspective of protecting the global environment and the like, attention has been paid to the amount of carbon dioxide emissions (carbon dioxide emissions, CO2 emissions). Technologies related to such carbon dioxide emissions are disclosed, for example, in Patent Document 1. This Patent Document 1 discloses a carbon dioxide emission calculation system for obtaining the amount of CO2 emissions related to target products of a target type manufactured in a factory capable of manufacturing products through a plurality of processes in a predetermined period.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] The carbon dioxide emission calculation system disclosed in Patent Document 1 can determine the CO2 emissions for a target product of a target type manufactured during a predetermined period. That is, the carbon dioxide emission calculation system disclosed in Patent Document 1 can determine the CO2 emissions when multiple processes for manufacturing the product are included in the predetermined period. However, some products are manufactured over multiple periods, and in such cases, the product may be an unfinished product (semi-finished product) that is not completed at the end of the target period (the current period) for which CO2 emissions are calculated, or the product that was unfinished at the beginning of the current period may be manufactured and completed during the current period. For this reason, if the CO2 emissions of the raw materials used in the manufacture of the product are allocated to the product that was completed in the current period, the accuracy of the CO2 emissions of the product may deteriorate.

[0005] This invention was made in view of the above circumstances, and its purpose is to provide a carbon dioxide emission calculation system, a carbon dioxide emission calculation method, and a carbon dioxide emission calculation program that can more accurately determine the CO2 emissions of a product even when the product is manufactured over multiple periods. [Means for solving the problem]

[0006] The inventors have found, after various studies, that the above objective can be achieved by the present invention as follows. That is, a carbon dioxide emission calculation system according to one aspect of the present invention is a carbon dioxide emission calculation system that calculates the CO2 emissions of a target product during a target period among several different periods in a factory capable of manufacturing multiple types of products that are manufactured from raw materials through multiple processes, wherein the multiple processes include shipping operations for shipping the manufactured products, and for each of the multiple products, a product information storage unit that stores product information including raw material emission information representing the CO2 emissions of the raw materials used in the manufacture of the product and product performance information representing the completion date of each of the multiple processes carried out in the manufacture of the product, and a total work-in-progress emission calculation unit that calculates the total amount of CO2 emissions of raw materials used in the manufacture of products that are work-in-progress at the beginning of the target period and the total amount of CO2 emissions of raw materials used in the manufacture of products that become work-in-progress at the end of the target period as the total work-in-progress emissions at the beginning of the period and the total work-in-progress emissions at the end of the period, respectively, and the product information storage unit The system includes: a total period emissions calculation unit that calculates the total amount of CO2 emissions from raw materials used in the manufacture of products manufactured during the target period, based on product information stored in the memory unit, as the total period emissions; a net total period emissions calculation unit that calculates the difference between the total work-in-progress emissions at the beginning of the period and the total work-in-progress emissions at the end of the period, and if the total work-in-progress emissions at the beginning of the period are equal to or greater than the total work-in-progress emissions at the end of the period, it calculates the net total period emissions by adding the difference to the total period emissions calculated by the total period emissions calculation unit; and if the total work-in-progress emissions at the beginning of the period are less than or equal to the total work-in-progress emissions at the end of the period, it calculates the net total period emissions by subtracting the difference from the total period emissions calculated by the total period emissions calculation unit; and a product allocated emissions calculation unit that calculates the CO2 emissions to be allocated to the target products during the target period, as product allocated emissions, by multiplying the net total period emissions calculated by the net total period emissions calculation unit by a predetermined percentage. Here, "work in progress" refers to semi-finished products in the process of manufacturing, as well as finished products that have not yet been shipped, since the aforementioned processes include shipping operations.

[0007] This carbon dioxide emission calculation system adds or subtracts the difference between the total emissions of beginning work-in-process inventory and the total emissions of ending work-in-process inventory to the total emissions for the period, according to the relative magnitudes of the two total emissions. Therefore, it can determine the net total emissions for the period with greater accuracy, even when a product is manufactured over multiple periods. By multiplying this more accurately determined net total emissions for the period by a predetermined percentage, the CO2 emissions to be allocated to the target product during the target period are determined. Therefore, this carbon dioxide emission calculation system can determine the CO2 emissions of a product with greater accuracy, even when a product is manufactured over multiple periods. Since the shipping operation is also considered as one of the multiple processes and included in the multiple processes, the manufacturing period for the product is from the start date of manufacturing to the completion date of the shipping operation, and it is determined whether the product is work-in-process or not.

[0008] In another embodiment, in the carbon dioxide emission calculation system described above, the raw material emission information includes raw material quantity information representing the amount of raw materials used in the manufacture of the product, and the product allocation emission calculation unit, when determining the product allocation emission, determines the ratio of the amount of the target product during the target period to the total amount of products completed during the target period as the predetermined ratio.

[0009] Such a carbon dioxide emission calculation system can allocate product-based emissions, calculated as the ratio of the quantity of the target product during the target period to the total quantity of products completed during the target period, to the product.

[0010] In another embodiment, in the carbon dioxide emission calculation system described above, the raw materials comprise a plurality of raw material types, the product information further includes raw material type information representing the raw material type used in the manufacture of each of the plurality of products, the work-in-progress total emission calculation unit calculates the beginning work-in-progress total emission and ending work-in-progress total emission for each of the plurality of raw material types, the period total emission calculation unit calculates the period total emission for each of the plurality of raw material types, the net period total emission calculation unit calculates the net period total emission for each of the plurality of raw material types, and the product allocated emission calculation unit calculates the product allocated emission to be allocated to the target product during the target period by multiplying the net period total emission calculated by the net period total emission calculation unit for the raw material types of the target product during the target period by a predetermined ratio.

[0011] The CO2 emissions from raw materials can vary depending on the type of raw material. The above carbon dioxide emission calculation system calculates the emissions for each type of raw material, so even if the CO2 emissions from raw materials differ depending on the type of raw material, it can calculate the CO2 emissions of the product with greater accuracy.

[0012] In another embodiment, in the carbon dioxide emission calculation system described above, the product information further includes residual raw material emission information representing the CO2 emissions of the remaining raw materials obtained by subtracting the total amount of raw materials used to manufacture products that were manufactured during the target period from the total amount of raw materials consumed at the factory during the target period, and the net period total emission calculation unit further includes the CO2 emissions of the remaining raw materials in the net period total emission.

[0013] The raw materials consumed in a factory may include not only those used in the final product, but also those not used in the final product. For example, in a factory that manufactures metal materials as products, the raw materials may be used for cleaning the melting furnace, heating the rolling mill, or as auxiliary materials. The carbon dioxide emission calculation system described above takes into account the CO2 emissions from the remaining raw materials in the total net emissions for the period, so the calculation of CO2 emissions can also take into account the raw materials not used in the final product.

[0014] In another embodiment, in the carbon dioxide emission calculation system described above, the raw material emission information includes raw material quantity information representing the amount of raw materials used in the manufacture of the product, and unit emission information representing the raw material unit emission, which is the amount of CO2 emitted per unit amount of the raw material. The work-in-progress total emission calculation unit extracts products that are work-in-progress at the beginning of the target period from among the plurality of products based on the product performance information stored in the product information storage unit, determines the total amount of raw materials used in the manufacture of the extracted products as the beginning work-in-progress raw material total, calculates the beginning work-in-progress total emission by multiplying the determined beginning work-in-progress total raw material by the raw material unit emission, and calculates the beginning work-in-progress total emission based on the product performance information stored in the product information storage unit. The calculation unit then extracts products that are work-in-progress at the end of the target period from among the multiple products, determines the total amount of raw materials used in the manufacture of the extracted products as the total amount of raw materials for work-in-progress at the end of the period based on the raw material quantity information stored in the product information storage unit, and calculates the total amount of raw materials for work-in-progress at the end of the period by multiplying the calculated total amount of raw materials for work-in-progress by the raw material unit discharge rate. The calculation unit then extracts products that started manufacturing during the target period from among the multiple products based on the product performance information stored in the product information storage unit, determines the total amount of raw materials used in the manufacture of the extracted products as the total amount of raw materials for the period based on the raw material quantity information stored in the product information storage unit, and calculates the total amount of raw materials for the period by multiplying the calculated total amount of raw materials for the period by the raw material unit discharge rate.

[0015] According to this, a carbon dioxide emission calculation system can be provided that uses a single method to determine each type of emission.

[0016] In another embodiment, in the carbon dioxide emission calculation system described above, the raw material emission information includes raw material quantity information representing the amount of raw materials used in the manufacture of the product, and unit emission information representing the raw material unit emission, which is the CO2 emission per unit amount of the raw material, and the total work-in-progress emission calculation unit extracts products that are work-in-progress at the beginning of the target period from among the plurality of products based on the product performance information stored in the product information storage unit, and determines the total amount of raw materials used in the manufacture of the extracted products as the total amount of raw materials at the beginning of the work-in-progress, which replaces the total work-in-progress emissions at the beginning of the period, based on the product performance information stored in the product information storage unit, and extracts products that are work-in-progress at the end of the target period from among the plurality of products based on the product performance information stored in the product information storage unit, and determines the total amount of raw materials used in the manufacture of the extracted products as the total amount of raw materials at the end of the work-in-progress, which replaces the total work-in-progress emissions at the end of the period, based on the raw material quantity information stored in the product information storage unit, and the total period emission calculation unit stores Based on the product performance information, the system extracts products from the multiple products that were started to be manufactured during the target period, and based on the raw material quantity information stored in the product information storage unit, calculates the total amount of raw materials used to manufacture the extracted products as the total raw material quantity for the period which will replace the total emissions for the period. The net total emissions for the period calculation unit calculates the difference between the total raw material quantity for the beginning of the period and the total raw material quantity for the end of the period which was calculated by the total emissions for the work-in-progress calculation unit, and if the total raw material quantity for the beginning of the period is equal to or greater than the total raw material quantity for the end of the period, the system adds the calculated difference to the total raw material quantity for the period which was calculated by the total emissions for the period calculation unit, and calculates the net total emissions for the period by multiplying the added result by the raw material unit emissions. If the total raw material quantity for the beginning of the period is less than or equal to the total raw material quantity for the end of the period, the system subtracts the calculated difference from the total raw material quantity for the period which was calculated by the total emissions for the period, and calculates the net total emissions for the period by multiplying the subtracted result by the raw material unit emissions.

[0017] This allows for the provision of a carbon dioxide emission calculation system using another method for determining each emission level.

[0018] Another embodiment of the present invention relates to a carbon dioxide emission calculation method, which is a method for determining the CO2 emissions of a target product during a target period among several different periods in a factory capable of manufacturing multiple types of products from raw materials through multiple processes, comprising a work-in-progress total emission calculation step, a period total emission calculation step, a net period total emission calculation step, and a product allocated emission calculation step, wherein the multiple processes include shipping operations for shipping products after manufacturing is complete, and the product information includes, for each of the multiple products, raw material emission information representing the CO2 emissions of the raw materials used in the manufacture of the product, and product performance information representing the completion date of each of the multiple processes carried out in the manufacture of the product, and the work-in-progress total emission calculation step determines, based on the product information, the total amount of CO2 emissions of raw materials used in the manufacture of products that are work-in-progress at the beginning of the target period and the total amount of CO2 emissions of raw materials used in the manufacture of products that become work-in-progress at the end of the target period as the beginning work-in-progress total emission and the ending work-in-progress total emission, respectively. The total period emissions calculation step determines, based on the product information, the total amount of CO2 emissions from raw materials used in the manufacture of products manufactured during the target period as the total period emissions. The net total period emissions calculation step determines the difference between the total beginning work-in-process emissions and the total ending work-in-process emissions determined in the total work-in-process emissions calculation step. If the total beginning work-in-process emissions are equal to or greater than the total ending work-in-process emissions, the net total period emissions are calculated by adding the difference to the total period emissions determined in the total period emissions calculation step. If the total beginning work-in-process emissions are less than or equal to the total ending work-in-process emissions, the net total period emissions are calculated by subtracting the difference from the total period emissions determined in the total period emissions calculation step. The product allocated emissions calculation step determines the CO2 emissions to be allocated to the target product during the target period as the product allocated emissions by multiplying the net total period emissions determined in the net total period emissions calculation step by a predetermined percentage.

[0019] Such a carbon dioxide emission calculation method adds or subtracts the difference between the total emissions of work-in-progress at the beginning of the period and the total emissions of work-in-progress at the end of the period to the total emissions during the period according to the magnitude relationship between the total emissions of work-in-progress at the beginning of the period and the total emissions of work-in-progress at the end of the period. Therefore, the net total emissions during the period can be obtained more accurately even when the product is manufactured over a plurality of periods. By multiplying the more accurately obtained net total emissions during the period by a predetermined ratio, the CO2 emissions allocated to the target product in the target period are obtained. Therefore, the carbon dioxide emission calculation method can obtain the CO2 emissions of the product more accurately even when the product is manufactured over a plurality of periods.

[0020] A carbon dioxide emission calculation program according to another aspect of the present invention is a program for obtaining the CO2 emissions of a target product in a target period among a plurality of different periods in a factory capable of manufacturing a plurality of types of products manufactured through a plurality of processes from raw materials, and is a program for causing a computer to function as any of the above-mentioned carbon dioxide emission calculation systems.

[0021] According to this, a carbon dioxide emission calculation program can be provided, and this carbon dioxide emission calculation program exhibits the same operational effects as the above-mentioned carbon dioxide emission calculation systems.

Effects of the Invention

[0022] The carbon dioxide emission calculation system, carbon dioxide emission calculation method, and carbon dioxide emission calculation program according to the present invention can obtain the CO2 emissions of a product more accurately even when the product is manufactured over a plurality of periods.

Brief Description of the Drawings

[0023] [Figure 1] It is a diagram for explaining each emission amount obtained by the carbon dioxide emission calculation system in the embodiment. [Figure 2]It is a diagram showing the configuration of the carbon dioxide emissions calculation system in the embodiment. [Figure 3] As an example, it is a diagram showing the product performance information table. [Figure 4] As an example, it is a diagram showing the raw material type information table. [Figure 5] As an example, it is a diagram showing the unit emissions information table. [Figure 6] As an example, in the current period, it is a diagram showing the total amount of beginning work-in-process raw materials and the total amount of ending work-in-process raw materials obtained by summing up the amount of raw materials for each raw material type, as well as the difference between them. [Figure 7] As an example, in the current period, it is a diagram showing the total amount of in-process raw materials obtained by summing up the amount of raw materials used in the product for each raw material type. [Figure 8] As an example, in the current period, it is a diagram for explaining the calculation of the net period raw material total amount obtained for each raw material type. [Figure 9] As an example, in the current period, it is a diagram showing the net period total emissions excluding the CO2 emissions of the remaining raw materials and the total amount of the CO2 emissions of the remaining raw materials obtained for each raw material type. [Figure 10] As an example, in the current period, it is a diagram for explaining the calculation of the CO2 emissions of the remaining raw materials obtained for each raw material type. [Figure 11] As an example, in the current period, it is a diagram for explaining the calculation of the net period total emissions including the CO2 emissions of the remaining raw materials obtained for each raw material type. [Figure 12] As an example, in the current period, it is a diagram for explaining the calculation of the raw material unit emissions obtained for each raw material type. [Figure 13] As an example, in the current period, it is a diagram showing the product allocated emissions obtained for each product. [Figure 14] It is a flowchart showing the operation of the carbon dioxide emissions calculation system.

Embodiments for Carrying Out the Invention

[0024] Hereinafter, one or more embodiments of the present invention will be described with reference to the drawings. However, the scope of the invention is not limited to the disclosed embodiments. In each figure, components denoted by the same reference numerals are identified as identical components, and their descriptions are omitted where appropriate. In this specification, general reference numerals are used without subscripts, while individual components are indicated by subscripts.

[0025] Figure 1 is a diagram illustrating the various emissions calculated by the carbon dioxide emission calculation system in the embodiment. The carbon dioxide emission calculation system in the embodiment is a system that calculates the carbon dioxide emissions (CO2 emissions) of a target product during a target period among several different periods in a factory capable of manufacturing multiple types of products from raw materials through multiple processes. The multiple processes are considered as a single process and include the shipping operation for shipping the completed product. This carbon dioxide emission calculation system comprises a product information storage unit, a work-in-progress total emissions calculation unit, a period total emissions calculation unit, a net period total emissions calculation unit, and a product allocated emissions calculation unit. The product information storage unit stores product information for each of the multiple products, including raw material emission information representing the CO2 emissions of the raw materials used in the manufacture of the product, and product performance information representing the completion date of each of the multiple processes carried out in the manufacture of the product. In Figure 1, the work-in-progress total emissions calculation unit calculates, based on the product information stored in the product information storage unit, the total amount of CO2 emissions from raw materials used to manufacture products that are work-in-progress at the beginning of the target period (CO2(A)) and the total amount of CO2 emissions from raw materials used to manufacture products that become work-in-progress at the end of the target period (CO2(C)), respectively, as the beginning work-in-progress total emissions (CO2(A)) and the ending work-in-progress total emissions (CO2(C)), respectively. The period total emissions calculation unit calculates, based on the product information stored in the product information storage unit, the total amount of CO2 emissions from raw materials used to manufacture products that started production during the target period (CO2(B)), as the period total emissions (CO2(B)).The net total emissions calculation unit calculates the difference (CO2(AC)) between the beginning total emissions of work-in-process (CO2(A)) and the ending total emissions of work-in-process (CO2(C)) obtained by the work-in-process total emissions calculation unit. If the beginning total emissions of work-in-process (CO2(A)) are equal to or greater than the ending total emissions of work-in-process (CO2(C)), the net total emissions for the period (D=CO2(B+(AC))) is calculated by adding the difference to the total emissions for the period (CO2(B)) obtained by the total emissions calculation unit. If the beginning total emissions of work-in-process (CO2(A)) are less than or equal to the ending total emissions of work-in-process (CO2(C)), the net total emissions for the period (D=CO2(B-(AC))) is calculated by subtracting the difference from the total emissions for the period (CO2(B)) obtained by the total emissions calculation unit. The product allocation emission calculation unit calculates the CO2 emissions to be allocated to the target product during the target period as the product allocation emission by multiplying the net period total emission D obtained by the net period total emission calculation unit by a predetermined ratio. Here, "work in progress" refers to semi-finished products in the process of manufacturing, and products before the completion of shipping operations, since the aforementioned multiple processes also include shipping operations.

[0026] The following provides a more detailed explanation of such a carbon dioxide emission calculation system, as well as the carbon dioxide emission calculation method and carbon dioxide emission calculation program implemented therein. Here, as an example, we will explain using a factory (plant) capable of manufacturing various types of rolled steel sheets, but the factory (plant) can be any type as long as it has multiple pieces of equipment and is capable of manufacturing multiple types of products from raw materials through multiple processes. The carbon dioxide emission calculation system may be configured by connecting an input / output terminal device for inputting and outputting data, one or more processing units (e.g., a server device) that perform various calculation processes, and one or more database devices that store (manage) various data in a way that allows them to communicate with each other. At least some of these input / output terminal devices, one or more processing units, and one or more database devices may be configured as a single unit and connected to the rest in a way that allows them to communicate with each other, but here we will explain the carbon dioxide emission calculation system using a carbon dioxide emission calculation device that integrates all of these components as an example.

[0027] Figure 2 shows the configuration of a carbon dioxide emission calculation system (a carbon dioxide emission calculation device as an example) in an embodiment.

[0028] The carbon dioxide emission calculation system (carbon dioxide emission calculation device as an example) 1000 in this embodiment includes, for example, a control processing unit 1, an input unit 2, an output unit 3, an interface unit (IF unit) 4, and a storage unit 5, as shown in Figure 2.

[0029] The input unit 2 is connected to the control processing unit 1 and is a device that inputs various commands to the carbon dioxide emission calculation device 1000, such as a command to instruct the start of CO2 emission calculation, and various data necessary for operating the carbon dioxide emission calculation device 1000, such as the CO2 emissions of raw materials used in the manufacture of the product and the completion dates of each of the multiple processes carried out in the manufacture of the product. For example, the input unit 2 is a device that is connected to the control processing unit 1 and outputs commands, data, and calculation results input from the input unit 2 according to the control of the control processing unit 1. For example, the output unit 3 is a device that is connected to the control processing unit 1 and outputs commands, data, and calculation results input from the input unit 2. For example, the output unit 3 is a display device such as a CRT display, LCD (liquid crystal display device), and organic EL display, or a printing device such as a printer.

[0030] The input unit 2 and output unit 3 may be configured as touch panels. In this configuration, the input unit 2 is a position input device that detects and inputs the operating position, such as a resistive or capacitive touch panel, and the output unit 3 is a display device. In this touch panel, a position input device is provided on the display surface of the display device, and one or more candidate input contents that can be input to the display device are displayed. When the user touches the display position that displays the input content they wish to input, the position input device detects that position, and the display content displayed at the detected position is input to the carbon dioxide emission calculation device 1000 as the user's operation input. With such a touch panel, the user can easily understand the input operation intuitively, thus providing a carbon dioxide emission calculation device 1000 that is easy for the user to use.

[0031] The IF unit 4 is connected to the control processing unit 1 and, in accordance with the control of the control processing unit 1, is a circuit that inputs and outputs data to and from external devices, for example. Examples include an RS-232C serial communication interface circuit, an interface circuit using the Bluetooth® standard, and an interface circuit using the USB standard. Alternatively, the IF unit 4 may be a communication interface circuit that sends and receives communication signals to and from external devices, such as a data communication card or a communication interface circuit conforming to the IEEE 802.11 standard.

[0032] The memory unit 5 is connected to the control processing unit 1 and is a circuit that stores various predetermined programs and various predetermined data in accordance with the control of the control processing unit 1.

[0033] The various predetermined programs mentioned above include, for example, a control processing program, which includes, for example, a control program, a work-in-progress total emissions calculation program, a period total emissions calculation program, a net period total emissions calculation program, and a product allocation emissions calculation program. The control program is a program that controls each of the parts 2 to 5 of the carbon dioxide emission calculation device 1000 according to the function of each part. The work-in-progress total emissions calculation program is a program that calculates the total amount of CO2 emissions from raw materials used to manufacture products that are work-in-progress at the beginning of the target period and the total amount of CO2 emissions from raw materials used to manufacture products that become work-in-progress at the end of the target period, based on product information stored in the product information storage unit 51 of the storage unit 5, as the beginning work-in-progress total emissions and the ending work-in-progress total emissions, respectively. The period total emissions calculation program is a program that calculates the total amount of CO2 emissions from raw materials used to manufacture products that started manufacturing during the target period, based on product information stored in the product information storage unit 51, as the period total emissions. The net period total emissions calculation program calculates the difference between the beginning work-in-process total emissions and the ending work-in-process total emissions obtained by the work-in-process total emissions calculation program. If the beginning work-in-process total emissions are equal to or greater than the ending work-in-process total emissions, the program calculates the net period total emissions by adding the calculated difference to the period total emissions obtained by the period total emissions calculation unit. If the beginning work-in-process total emissions are less than or equal to the ending work-in-process total emissions, the program calculates the net period total emissions by subtracting the calculated difference from the period total emissions obtained by the period total emissions calculation program. The product allocated emissions calculation program calculates the product allocated emissions, which are the CO2 emissions to be allocated to the target product during the target period, by multiplying the net period total emissions obtained by the net period total emissions calculation program by a predetermined percentage.

[0034] The aforementioned various predetermined data include, for example, product information, various calculation results during the calculation process, and the final calculation result, which are all data necessary for executing these programs.

[0035] Such a storage unit 5 may include, for example, a non-volatile memory element such as ROM (Read Only Memory) or a rewritable non-volatile memory element such as EEPROM (Electrically Erasable Programmable Read Only Memory). Furthermore, the storage unit 5 includes RAM (Random Access Memory) which serves as the working memory of the control processing unit 1, storing data generated during the execution of the predetermined program. The storage unit 5 may also be configured to include a hard disk drive or solid-state drive (SSD) with a relatively large storage capacity.

[0036] The memory unit 5 is functionally equipped with a product information storage unit 51 for storing product information.

[0037] The product information storage unit 51 stores product information. The product information includes raw material emission information, product performance information, raw material type information, and residual raw material emission information. The raw material emission information represents the CO2 emissions of the raw materials used in the manufacture of the product. The raw material emission information may be stored in the product information storage unit 51 as raw material emission amounts themselves, but in this embodiment, the raw material emission information includes, for example, raw material quantity information representing the amount of raw materials used in the manufacture of the product (raw material quantity), and unit emission information representing raw material unit emission, which is the CO2 emissions per unit quantity of the raw material, and is stored in the product information storage unit 51 as raw material quantity and raw material unit emission. The raw material unit emission can be different depending on the type of raw material because the type of metal, the type of auxiliary material, and the composition ratio of these when constituting the raw material differ depending on the type of raw material. The product performance information represents the completion date of each of the multiple processes carried out in the manufacture of the product, and is stored in the product information storage unit 51 as, for example, the process completion date, which is the date on which the process was completed. The raw material type information is information representing the type of raw material used in the manufacture of the product (raw material type), and is stored in the product information storage unit 51 as the name of the raw material type. The residual raw material emission information is information representing the CO2 emissions (residual raw material emissions) of the remaining raw materials (residual raw materials) obtained by subtracting the total amount of raw materials used in the manufacture of products that were started during the target period from the total amount of raw materials consumed by the factory during the target period. The residual raw material emission information may be stored in the product information storage unit 51 as the residual raw material emissions themselves, but in this embodiment, it is stored in the product information storage unit 51 as the amount of residual raw materials (residual raw material amount) and the raw material unit emission, which is the CO2 emissions per unit amount of residual raw materials. The residual raw material amount is stored as is in the product information storage unit 51, and the raw material unit emission for the residual raw materials is registered in the unit emission information table UT as described later and stored in the product information storage unit 51. Product information is provided for each of multiple products, and products and product information are stored in association.

[0038] Figure 3 shows an example of a product performance information table. Figure 4 shows an example of a raw material type information table. Figure 5 shows an example of a unit emission information table.

[0039] In this embodiment, product information is stored in the product information storage unit 51 in table format, and the raw material discharge information, product performance information, and raw material type information in the product information are divided into multiple tables and stored in the product information storage unit 51. For example, in this embodiment, the aforementioned information of the product is divided into three tables: the product performance information table PT, the raw material type information table ST, and the unit discharge information table UT, and stored in the product information storage unit 51. These aforementioned pieces of product information may be stored together in one table in the product information storage unit 51, or they may be stored in two or more tables in the product information storage unit 51.

[0040] The product performance information table PT is provided for each of the aforementioned products and is a table that registers the amount of raw materials used in the manufacture of the product, the multiple processes carried out in the manufacture of the product, the processing volume of each of the multiple processes carried out in the manufacture of the product, and the completion date of each of the multiple processes carried out in the manufacture of the product. The product performance information table PT for a product is stored in the product information storage unit 51 in association with the product identifier (product ID) of that product. This product performance information table PT (PT-1, ..., PT-30, ..., PT-51, ..., PT-60, ...) includes, for example, as shown in Figure 3, a process number field 511 for registering the process number, an equipment name field 512 for registering the equipment name of the equipment that carries out the process of the process number registered in the process number field 511, a processing volume field 513 for registering the processing volume of the process of the process number registered in the process number field 511, and a completion date field 514 for registering the completion date of the process of the process number registered in the process number field 511, and has a record for each process in the product. In the product performance information table PT, the shipping operation is considered one of the processes, and information regarding the shipping operation is registered in the product performance information table PT. To indicate that it is a record that registers information regarding the shipping operation, "Shipping" is registered in the equipment name field 512, and in the record in which "Shipping" is registered in the equipment name field 512, the shipping quantity is registered in the processing volume field 513, and the shipping completion date is registered in the completion date field 514. The shipping quantity also represents the quantity of the product (product quantity), and in this embodiment, since information regarding the shipping operation is registered in the product performance information table PT, the product quantity is registered in the product performance information table PT. Note that the equipment name (equipment name field 512) is not necessarily required for calculating the product allocation discharge amount, but in the example shown in Figure 3, the equipment name field 512 is provided in the product performance information table PT.

[0041] The process number is a number that represents the order of execution in multiple processes carried out in the manufacturing of the product. In this embodiment, one process is carried out by one piece of equipment. As shown in Figure 3C, the same equipment may be used for multiple processes. The equipment name is an example of an identifier (equipment ID) for identifying and distinguishing equipment. The process volume is the amount processed in the execution of the process. The process volume is expressed in a predetermined unit that is set appropriately in advance, such as weight (processing weight, e.g., tons or kilograms) or time (processing time, e.g., hours or minutes). In the example shown in Figure 3, the process volume is expressed in weight [tons]. Therefore, the shipment volume (product volume) is also expressed in weight [tons]. The process completion date is the date the process was completed. The shipment completion date is the date the shipment was completed. In the example shown in Figure 3, the process completion date and the shipment completion date are expressed in months and days, but they may be expressed in other units such as year, month, and day.

[0042] Since the shipping operation is also considered as one of the aforementioned multiple processes and included in those processes, the manufacturing period for the product is from the start date of manufacturing to the completion date of the shipping operation, and it is determined whether or not the product is work in progress. The start date of manufacturing may be included in the product information, but in this embodiment, the start date of manufacturing is not included in the product information, and the start date of manufacturing is before the completion date of process number "1". Therefore, whether or not the product is work in progress is determined by the period from the completion date of process number "1" to the completion date of the shipping operation.

[0043] In this embodiment, the processing amount registered in the processing amount field 513 of a record in which the process number "1" is registered in the process number field 511 also represents the amount of raw materials used in the manufacture of the product (raw material amount).

[0044] The aforementioned product ID is an identifier used to identify and distinguish a product, such as the product name. The product ID is assigned to each product order, and in this embodiment, it also represents the product type. Therefore, in this embodiment, different orders will have different product types. In this embodiment, the product type is defined on an order-by-order basis, but it is not limited to this and may be defined according to other rules. For example, the product type may be defined by the product model number or the product's component composition. In cases where the product type is defined on an order-by-order basis, there may be exceptional provisions where the product type is the same even if the orders are different.

[0045] As described above, a product performance information table PT is provided for each of the aforementioned products. Figure 3 shows product performance information table PT-1 for product name "P001", product performance information table PT-30 for product name "P030", product performance information table PT-51 for product name "P051", and product performance information table PT-60 for product name "P060", while the product performance information tables PT for other products are not shown.

[0046] For example, in the product performance information table PT-1 for the product with product name "P001" shown in Figure 3A, in a record where process number "1" is registered in process number field 511, the equipment name field 512, processing volume field 513, and completion date field 514 will each be registered as "Equipment A", "15", and "April 20th", respectively. In a record where process number "2" is registered in process number field 511, the equipment name field 512, processing volume field 513, and completion date field 514 will each be registered as "Equipment B", "12", and "April 23rd", respectively. In a record where process number "3" is registered in process number field 511, the equipment name field 512, processing volume field 513, and completion date field 514 will each be registered as In the record where the process number field 511 is set to process number; "4" is set to process number; in the record where the process number field 511 is set to process number; "4" is set to process number; in the record where the process number field 511 is set to process number; "4" is set to process number; in the record where the process number field 511 is set to process number; "5" is set to process number; in the record where the process number field 512 is set to process number; "5" is set to process number; in the record where the process number field 512 is set to process number; "10" is set to process number; and in the record where the process number field 512 is set to process number; and "10" is set to process number; and "15" is set to process number; and "15" is set to process number; and Assuming the length of the predetermined period is one month and the target period (current period) is May, each of the processes with process numbers "1" through "4" is carried out in April of the previous period, which is one period prior to the target period, and each of the processes with process number "5" and "shipping" is carried out in May of the current period, which is the target period. For this product with product name "P001", manufacturing begins in April of the previous period, and by April of the previous period, the implementation of processes up to process number "4" is completed. In May of the current period, manufacturing begins from process number "5", and manufacturing is completed and shipped in May of the current period.

[0047] Furthermore, the length of the period is not limited to one month, but may be set appropriately according to the purpose of managing CO2 emissions, such as three months, six months, or one year.

[0048] The raw material type information table ST is a table that registers the raw material type and product quantity for each of the multiple products mentioned above. Note that the product quantity is registered in the product performance information table PT and may be omitted from the raw material type information table ST. The raw material type information table ST includes, for example, a product name field 521 for registering the product name, a raw material type name field 522 for registering the raw material type name for the product with the product name registered in the product name field 521, and a product weight field 523 for registering the product quantity for the product with the product name registered in the product name field 521, and has a record for each product. The raw material type name is the name of the raw material type and is an example of an identifier (raw material type ID) for identifying and distinguishing the raw material type. In the example shown in Figure 4, the product quantity is expressed in weight [tons].

[0049] For example, in the raw material type information table ST shown in Figure 4, in the record where the product name "P001" is registered in the product name field 521, the raw material type name field 522 and the product weight field 523 are registered as "H1" and "10" respectively.

[0050] The Unit Emission Information Table UT is a table that registers the unit emission amount for each of several raw material types. As shown in Figure 5, for example, the Unit Emission Information Table UT includes a raw material type name field 531 for registering the name of the raw material type, and a unit emission field 532 for registering the unit emission amount for the raw material type registered in the raw material type name field 531, and has a record for each raw material type. In the example shown in Figure 5, the unit emission amount for raw materials is expressed in [tCO2 / ton].

[0051] For example, in the unit emission information table UT shown in Figure 5, the unit emission field 532 in a record where the raw material type name "H1" is registered in the raw material type name field 531 is "8". The raw material type name "HX" is the raw material type name of the residual raw material.

[0052] Note that a unit emission information table UT is prepared for each of multiple periods, and the unit emissions of raw materials may differ from period to period. In this case, the unit emission information table UT corresponding to the target period is used.

[0053] Returning to Figure 2, the control processing unit 1 is a circuit that controls each of the parts 2 to 5 of the carbon dioxide emission calculation device 1000 according to the function of each part, and calculates the CO2 emissions to be allocated to the target product during the target period (product-allocated emissions). The control processing unit 1 is configured, for example, with a CPU (Central Processing Unit) and its peripheral circuits. When the control processing program is executed, the control unit 11, the work-in-progress total emissions calculation unit 12, the period total emissions calculation unit 13, the net period total emissions calculation unit 14, and the product-allocated emissions calculation unit 15 are functionally configured in the control processing unit 1.

[0054] The control unit 11 controls each of the parts 2 to 5 of the carbon dioxide emission calculation device 1000 according to the function of each part, and is in charge of the overall control of the carbon dioxide emission calculation device 1000.

[0055] The work-in-progress total emissions calculation unit 12 calculates, based on the product information stored in the product information storage unit 51, the total amount of CO2 emissions from raw materials used to manufacture products that were work-in-progress at the beginning of the target period and the total amount of CO2 emissions from raw materials used to manufacture products that became work-in-progress at the end of the target period, respectively, as the beginning work-in-progress total emissions and the ending work-in-progress total emissions.

[0056] The total emissions calculation unit 13 calculates the total amount of CO2 emissions from raw materials used in the manufacture of products that were manufactured during the target period, based on the product information stored in the product information storage unit 51, as the total emissions for the period.

[0057] The Net Period Total Emissions Calculation Unit 14 calculates the difference between the beginning total work-in-process emissions and the ending total work-in-process emissions calculated by the Work-in-Process Total Emissions Calculation Unit 12. If the beginning total work-in-process emissions are equal to or greater than the ending total work-in-process emissions (or if the beginning total work-in-process emissions are greater than the ending total work-in-process emissions), it calculates the Net Period Total Emissions by adding the calculated difference to the period total emissions calculated by the Period Total Emissions Calculation Unit 13. If the beginning total work-in-process emissions are less than or equal to the ending total work-in-process emissions (or if the beginning total work-in-process emissions are equal to or less than the ending total work-in-process emissions), it calculates the Net Period Total Emissions by subtracting the calculated difference from the period total emissions calculated by the Period Total Emissions Calculation Unit 13.

[0058] The product allocation emission calculation unit 15 calculates the CO2 emissions to be allocated to the target product during the target period as the product allocation emission by multiplying the total net period emissions calculated by the net period total emissions calculation unit 14 by a predetermined ratio. In this embodiment, when calculating the product allocation emission, the product allocation emission calculation unit 15 determines the ratio of the amount of the target product during the target period to the total amount of products completed during the target period as the predetermined ratio ((the ratio) = (amount of target product during the target period) / (total amount of products completed during the target period)). In this embodiment, as described above, the shipping operation is also considered as one of several processes, so the completed product is the shipped product (the product for which the shipping operation has been completed).

[0059] More specifically, the total work-in-progress discharge calculation unit 12 extracts products that are work-in-progress at the beginning of the target period from among the multiple products based on the product performance information stored in the product information storage unit 51, and determines the total amount of raw materials used to manufacture the extracted products as the total amount of raw materials at the beginning of the work-in-progress period, which substitutes for the total work-in-progress discharge at the beginning of the period, based on the raw material quantity information stored in the product information storage unit 51. In other words, the total work-in-progress discharge calculation unit 12 extracts products that are work-in-progress at the beginning of the target period from among the multiple products based on the product performance information stored in the product information storage unit 51, and determines the total amount of raw materials at the beginning of the period, which is the sum of the amounts of raw materials used to manufacture the extracted products, as the total work-in-progress discharge at the end of the period.

[0060] The total work-in-progress discharge calculation unit 12 extracts products that are work-in-progress at the end of the target period from among the multiple products based on the product performance information stored in the product information storage unit 51, and determines the total amount of raw materials used in the manufacture of the extracted products as the total amount of raw materials at the end of the work-in-progress period, which substitutes for the total work-in-progress discharge at the end of the period, based on the raw material quantity information stored in the product information storage unit 51. In other words, the total work-in-progress discharge calculation unit 12 extracts products that are work-in-progress at the end of the target period from among the multiple products based on the product performance information stored in the product information storage unit 51, and determines the total amount of raw materials at the end of the work-in-progress period, which is the sum of the amounts of raw materials used in the manufacture of the extracted products, as the total work-in-progress discharge at the end of the period.

[0061] The total emissions calculation unit 13 extracts products from the multiple products that started production during the target period based on the product performance information stored in the product information storage unit 51, and calculates the total amount of raw materials used in the production of the extracted products as the total raw material amount for the period, which substitutes for the total emissions for the period. In other words, the total emissions calculation unit 13 extracts products from the multiple products that started production during the target period based on the product performance information stored in the product information storage unit 51, and calculates the total raw material amount for the period, which is the sum of the amounts of raw materials used in the production of the extracted products, as the total emissions for the period.

[0062] The Net Period Total Emissions Calculation Unit 14 calculates the difference between the total amount of raw materials for the beginning work-in-process inventory, which is the total work-in-process inventory emissions at the beginning of the period, and the total amount of raw materials for the ending work-in-process inventory, which is the total work-in-process inventory emissions at the end of the period, which is the total work-in-process inventory emissions at the beginning of the period, and if the total amount of raw materials for the beginning of the period is greater than or equal to the total amount of raw materials for the ending work-in-process inventory (or if the total amount of raw materials for the beginning of the period is greater than the total amount of raw materials for the ending work-in-process inventory), the total raw materials for the period, which is the total emissions for the period, calculated by the Period Total Emissions Calculation Unit 13, and the difference between the total raw materials for the period, which is the total emissions for the period which is the difference between the total raw materials for the beginning of the period, which is the total emissions for the period, and the difference between the total raw materials for the beginning of the period, which is the total emissions for the period, which is the difference The net total emissions for the period are calculated by adding the difference and multiplying the added result by the raw material unit emissions. If the total amount of raw materials for work-in-process at the beginning of the period is less than the total amount of raw materials for work-in-process at the end of the period (or if the total amount of raw materials for work-in-process at the beginning of the period is less than or equal to the total amount of raw materials for work-in-process at the end of the period), the net total emissions for the period are calculated by subtracting the difference obtained from the total amount of raw materials for the period obtained by the total emissions calculation unit 13 and multiplying the subtracted result by the raw material unit emissions.

[0063] In this embodiment, the net period total emissions calculation unit 14 further includes the CO2 emissions from the remaining raw materials in the net period total emissions.

[0064] If there is only one type of raw material, or if there are multiple types of raw materials but the calculation is not performed separately for each type, the calculation can be performed using the calculation units 12 to 15 described above. In this case, the unit discharge amount of raw materials is the weighted average of the unit discharge amounts of each raw material across multiple types of raw materials. Each weight in the weighted average for each of the multiple types of raw materials is the ratio of the total amount of raw materials of that type during the target period to the total amount of raw materials consumed by the factory during the target period ((weight of the raw material type) = (total amount of raw materials of that type) / (total amount of raw materials)).

[0065] In this embodiment, each calculation is performed for each of the multiple raw material types. Therefore, the total work-in-process emissions calculation unit 12 calculates the total beginning work-in-process emissions and the total ending work-in-process emissions for each of the multiple raw material types. The total period emissions calculation unit 13 calculates the total period emissions for each of the multiple raw material types. The net period total emissions calculation unit 14 calculates the net period total emissions for each of the multiple raw material types. The product allocated emissions calculation unit 15 calculates the product allocated emissions to be allocated to the target product during the target period by multiplying the net period total emissions calculated by the net period total emissions calculation unit 14 for the raw material types of the target product during the target period by a predetermined ratio.

[0066] Let's take an example and explain each operation in calculation units 12-15 in more detail.

[0067] Figure 6 shows, as an example, the total amount of raw materials in beginning and ending work-in-process inventory, and the difference between them, calculated by summing the amounts of raw materials for each type of raw material during the current period. Figure 7 shows, as an example, the total amount of raw materials in period work-in-process inventory, calculated by summing the amounts of raw materials used in products for each type of raw material during the current period. Figure 8 is a diagram illustrating, as an example, the calculation of the net total amount of raw materials for the period, calculated for each type of raw material during the current period. Figure 9 shows, as an example, the net total emissions for the period, excluding CO2 emissions from residual raw materials, and the total amount of CO2 emissions from residual raw materials, calculated for each type of raw material during the current period. Figure 10 is a diagram illustrating, as an example, the calculation of CO2 emissions from residual raw materials, calculated for each type of raw material during the current period. Figure 11 is a diagram illustrating, as an example, the calculation of net total emissions for the period, including CO2 emissions from residual raw materials, calculated for each type of raw material during the current period. Figure 12 is a diagram illustrating, as an example, the calculation of unit emissions from raw materials, calculated for each type of raw material during the current period. Figure 13 shows, as an example, the product-allocated emissions calculated for each product during the current period.

[0068] In this example, the product information storage unit 51 stores the product performance information table PT, the raw material type information table ST, and the unit emission information table UT shown in Figures 3 to 5, and the residual raw material quantity is stored as "100" [ton]. Regarding the calculation of CO2 emissions from the residual raw material, in order to treat it similarly to the product, the product information storage unit 51 may store, for example, the residual raw material quantity at the beginning of the period as "20" [ton], the residual raw material quantity (usage) for the current period (target period) as "80" [ton], and the residual raw material quantity at the end of the period as "0" [ton]. The current period is assumed to be "May".

[0069] First, the total work-in-progress discharge calculation unit 12 refers to the product performance information table PT (PT-1, PT-2, PT-3, ...) stored in the product information storage unit 51 and extracts products that are work-in-progress at the beginning of the current period from among the multiple products registered in the product performance information table PT. Next, the total work-in-progress discharge calculation unit 12 extracts the raw material quantities for these extracted products from the product performance information table PT, and then extracts the raw material types for the extracted products from the raw material type information table ST. Next, the total work-in-progress discharge calculation unit 12 aggregates (sums) the raw material quantities for these extracted products by raw material type, thereby determining the total amount of raw materials for work-in-progress at the beginning of the period for each raw material type. Next, the total work-in-progress discharge calculation unit 12 refers to the product performance information table PT (PT-1, PT-2, PT-3, ...) stored in the product information storage unit 51 and extracts products that are work-in-progress at the end of the current period from among the multiple products registered in the product performance information table PT. Next, the total work-in-progress discharge calculation unit 12 extracts the raw material quantities for the extracted products from the product performance information table PT, and then extracts the raw material types for the extracted products from the raw material type information table ST. Subsequently, the total work-in-progress discharge calculation unit 12 aggregates (sums up) the raw materials for the extracted products by raw material type, thereby determining the total amount of raw materials for work-in-progress at the end of the period for each raw material type. For example, as shown in Figure 6, the total amount of raw materials for work-in-progress at the beginning and the total amount of raw materials for work-in-progress at the end of the period are determined for each raw material type. For example, for the raw material type name "H1", the total amount of raw materials for work-in-progress at the beginning is "300" [tons], and the total amount of raw materials for work-in-progress at the end of the period is "50" [tons]. In Figure 6, the quantities of the remaining raw materials are shown in the dashed lines.

[0070] Next, the total emissions calculation unit 13 refers to the product performance information table PT (PT-1, PT-2, PT-3, ...) stored in the product information storage unit 51 and extracts products that started production during the current period from among the multiple products registered in the product performance information table PT. Next, the total emissions calculation unit 13 extracts the raw material quantities for these extracted products from the product performance information table PT, and then extracts the raw material types for the extracted products from the raw material type information table ST. Next, the total emissions calculation unit 13 aggregates (sums up) the raw material quantities for these extracted products for each raw material type, thereby determining the total raw material quantity for each raw material type during the period. For example, as shown in Figure 7, the total raw material quantity for each raw material type during the period is determined. For example, for the raw material type with the name "H1", the total raw material quantity for the period is "700" [tons]. In Figure 7, the quantity of the remaining raw materials is shown in the dashed line row.

[0071] Next, the net period total emissions calculation unit 14 calculates the difference for each of the multiple raw material types between the total amount of raw materials for the beginning of the period, which is calculated by the total amount of raw materials for the beginning of the period, and the total amount of raw materials for the ending of the period, which is calculated by the total amount of raw materials for the beginning of the period, which is calculated by the total amount of raw materials for the ending of the period, for each of the multiple raw material types. For example, as shown in Figure 6, the difference for each raw material type is calculated. For example, for the raw material type name "H1", the difference is "250" (=|300-50|) [tons], and for the raw material type name "H2", the difference is "100" (=|0-100|) [tons]. Here, in Figure 6, the sign "+" indicates that the total amount of raw materials for the beginning of the period is equal to (or greater than) the total amount of raw materials for the ending of the period, and the sign "-" indicates that the total amount of raw materials for the beginning of the period is less than (or less than) the total amount of raw materials for the ending of the period. The same applies to Figure 8.

[0072] Next, the net total emissions calculation unit 14 calculates the net total emissions for each of the multiple raw material types. If the total amount of raw materials in the beginning of the period is equal to or greater than the total amount of raw materials in the ending of the period, it adds the difference calculated above to the total amount of raw materials for the period calculated by the total emissions calculation unit 13, and this added result is taken as the net total amount of raw materials for the period. If the total amount of raw materials in the beginning of the period is less than or equal to the total amount of raw materials in the ending of the period, it subtracts the difference calculated above from the total amount of raw materials for the period calculated by the total emissions calculation unit 13, and this subtracted result is taken as the net total amount of raw materials for the period. For example, as shown in Figure 8, the net total amount of raw materials for each raw material type is calculated. For example, for the raw material type named "H1", the net total amount of raw materials for the period is "950" (=700+250) [tons], and for the raw material type named "H2", the net total amount of raw materials for the period is "400" (=500-100) [tons]. In Figure 7, the quantities of each of the remaining raw materials are shown in the dashed lines.

[0073] Next, the net period total emissions calculation unit 14 calculates the net period total emissions for each of the multiple raw material types by multiplying the net period total amount of raw material calculated above by the raw material unit emissions for that raw material type. For example, as shown in Figure 9, the net period total emissions for each raw material type are calculated. For example, for the raw material type named "H1", the net period total emissions are "7600" (=950 × 8) [tCO2].

[0074] In this embodiment, the net total emissions include the CO2 emissions from the residual raw materials. Subsequently, the net total emissions calculation unit 14 calculates the final net total emissions for each of the multiple raw material types by adding the CO2 emissions from the residual raw materials to the net total emissions calculated as described above for that raw material type. The residual raw materials are, for example, in a factory that manufactures metal materials as products, raw materials used for cleaning the melting furnace, raw materials used for heating the rolling mill, or raw materials used as auxiliary materials.

[0075] In this embodiment, first, the CO2 emissions of the residual raw materials are determined for each of the multiple raw material types. More specifically, the CO2 emissions of the residual raw materials for a given raw material type are calculated by multiplying the CO2 emissions of the residual raw materials for the current period, as determined above, by the ratio of the total amount of products shipped (completed) for that raw material type during the current period to the total amount of products shipped (completed) during the current period ((CO2 emissions of the residual raw materials for that raw material type) = (CO2 emissions of the residual raw materials for the current period) × ((total amount of products shipped for that raw material type during the current period) / (total amount of products shipped during the current period)). For example, as shown in Figure 10, the total amount of products shipped for each raw material type during the current period is determined, and the total amount of products shipped during the current period is determined to be "1600" [tons], and the CO2 emissions of the residual raw materials for the current period are determined to be "1000" [tCO2]. The CO2 emissions of the remaining raw materials for each raw material type are determined by apportionment based on the total amount ratio of the raw material type. For example, for the raw material type named "H1", the CO2 emissions of the remaining raw materials for that raw material type are "500" (=1000 × (800 / 1600)) [tCO2]. Then, the net period total emissions calculation unit 14 calculates the final net period total emissions for each of the multiple raw material types by adding the CO2 emissions of the remaining raw materials, as calculated above, to the net period total emissions for that raw material type, as calculated above, as shown in Figure 11, for example. For example, for the raw material type named "H1", the final net period total emissions are "8100" (=7600 + 500)) [tCO2].

[0076] Next, the product allocation emission calculation unit 15 calculates the CO2 emissions to be allocated to the target product during the target period as the product allocation emission by multiplying the net period total emission (in this embodiment, the final net period total emission) obtained by the net period total emission calculation unit 14 by a predetermined ratio. In this embodiment, first, as shown in Figure 12, for example, the product allocation emission calculation unit 15 calculates the unit emission per product (unit emission per product for each type of raw material) for each of the multiple types of raw materials by dividing the final net period total emission for that type of raw material by the total amount of products shipped (completed) during the period ((unit emission per product for that type of raw material) = (final net period total emission for that type of raw material) / (total amount of products shipped during the period for that type of raw material)). For example, for the raw material type named "H1", the unit emission per product for that type of raw material is "10.125" (=8100 / 800) [tCO2 / ton]. The product allocation emission calculation unit 15 then calculates the product allocation emission for the target product during the target period by multiplying the product unit emission of the raw material type for the target product during the target period by the product quantity of the target product during the target period. For example, if the target product during the target period is each of the multiple products, the product allocation emission for each product can be calculated as shown in Figure 13. For example, the product allocation emission for product name "P001" is "101.25" (=10 × 10.125) [tCO2], and the product allocation emission for product name "P002" is "142.5" (=20 × 7.125) [tCO2].

[0077] In the above description, the product-allocated emissions were calculated by multiplying the product quantity by the product unit emissions of each type of raw material. This is equivalent to calculating the product-allocated emissions by multiplying the net period total emissions (in this embodiment, the final net period total emissions) by a predetermined ratio, where the ratio of the quantity of the target product during the target period to the total quantity of products completed (shipped) during the target period is predetermined ((quantity of the target product during the target period) × ((final net period total emissions of each type of raw material in the target product) / (total quantity of products shipped during the period for each type of raw material in the target product)) = (final net period total emissions of each type of raw material in the target product) × ((quantity of the target product during the target period) / (total quantity of products shipped during the period for each type of raw material in the target product)).

[0078] By calculating the product unit emissions for each type of raw material, it becomes possible to compare CO2 emissions for each type of raw material, for example. This provides a practical value (convenience). Furthermore, by managing the product unit emissions for each type of raw material, it becomes possible to apply the same unit emissions for raw materials of the same type to shipments during a given period. This is useful when you want to apply the same unit consumption (average unit consumption) regardless of individual product yields for the same type of raw material over the same period (the idea being that yield differences depend on the equipment, not the product).

[0079] The control unit 11 then outputs the product allocation emissions for the target product for the target period, as determined by the product allocation emissions calculation unit 15, to the output unit 3, and the output unit 3 outputs this data externally. In addition, the total emissions of beginning work-in-process (total amount of beginning work-in-process), total emissions of ending work-in-process (total amount of ending work-in-process), total emissions for the period (total amount of raw materials for the period), and net total emissions for the period may also be output to the output unit 3 and output externally.

[0080] In a carbon dioxide emission calculation device 1000, which is an example of a carbon dioxide emission calculation system, the control processing unit 1, input unit 2, output unit 3, IF unit 4, and storage unit 5 can be configured by computers such as desktop or notebook computers. Of course, as mentioned above, the carbon dioxide emission calculation system may be configured by multiple computers that are connected in a communicative manner.

[0081] Next, the operation of this embodiment will be described. Figure 14 is a flowchart showing the operation of the carbon dioxide emission calculation system.

[0082] When the carbon dioxide emission calculation device 1000 with this configuration is powered on, it performs the initialization of each necessary part and starts operating. The control processing unit 1 is functionally configured with a control unit 11, a work-in-progress total emission calculation unit 12, a period total emission calculation unit 13, a net period total emission calculation unit 14, and a product allocation emission calculation unit 15, through the execution of its control processing program.

[0083] In Figure 14, when the target period and target product are input and specified by the user (operator) from the input unit 2, the carbon dioxide emission calculation device 1000 first calculates the total work-in-process emissions at the beginning of the period and the total work-in-process emissions at the end of the period using the work-in-process total emission calculation unit 12 of the control processing unit 1, and stores them in the storage unit 5 (S1). In this embodiment, the work-in-process total emission calculation unit 12 calculates the total amount of raw materials for work-in-process at the beginning of the period and the total amount of raw materials for work-in-process at the end of the period as the total work-in-process emissions at the beginning of the period and the total work-in-process emissions at the end of the period, respectively.

[0084] Next, the carbon dioxide emission calculation device 1000 calculates the total emissions for the period using the total emissions calculation unit 13 of the control processing unit 1 and stores it in the storage unit 5 (S2). In this embodiment, the total emissions calculation unit 13 calculates the total amount of raw materials for the period as the total emissions for the period.

[0085] Next, the carbon dioxide emission calculation device 1000 uses the net period total emission calculation unit 14 of the control processing unit 1 to determine the net period total emission and stores it in the storage unit 5 (S3). In this embodiment, the net period total emission calculation unit 14 determines the final net period total emission.

[0086] Next, the carbon dioxide emission calculation device 1000 uses the product allocation emission calculation unit 15 of the control processing unit 1 to determine the product allocation emission for the target product during the target period and stores it in the storage unit 5 (S4).

[0087] Then, the carbon dioxide emission calculation device 1000, via the control unit 11 of the control processing unit 1, outputs the product-allocated emission amount for the target product for the target period, which was determined by the product-allocated emission calculation unit 15, to the output unit 3 (S5), and the output unit 3 outputs it externally, thus ending this process. The control unit 11 may, if necessary, output the product-allocated emission amount for the target product for the target period to an external device via the IF unit 4.

[0088] As described above, the carbon dioxide emission calculation system (a carbon dioxide emission calculation device as an example) 1000 in the embodiment, as well as the carbon dioxide emission calculation method and carbon dioxide emission calculation program implemented therein, add or subtract the difference between the total amount of raw materials for work-in-process at the beginning of the period as total emissions of work-in-process and the total amount of raw materials for work-in-process at the end of the period as total emissions of work-in-process, to the total amount of raw materials for the period as total emissions of work-in-process, according to the relationship between the total amount of raw materials for work-in-process at the beginning of the period as total emissions of work-in-process and the total amount of raw materials for work-in-process at the end of the period as total emissions of work-in-process. Therefore, the net total emissions for the period can be determined with greater accuracy, even when the product is manufactured over multiple periods. By multiplying this more accurately determined net total emissions for the period by a predetermined ratio, the amount of CO2 emissions to be allocated to the target product during the target period is determined. Therefore, the carbon dioxide emission calculation system (carbon dioxide emission calculation device) 1000, the carbon dioxide emission calculation method and carbon dioxide emission calculation program can determine the CO2 emissions of a product with greater accuracy, even when the product is manufactured over multiple periods. In particular, when manufacturing metal materials as products, the proportion of CO2 emissions from raw materials is high within the total CO2 emissions of the product. Therefore, the above-mentioned carbon dioxide emission calculation system (carbon dioxide emission calculation device) 1000, carbon dioxide emission calculation method, and carbon dioxide emission calculation program are highly useful.

[0089] The above carbon dioxide emission calculation system (carbon dioxide emission calculation device) 1000, carbon dioxide emission calculation method, and carbon dioxide emission calculation program can allocate product-allocated emissions, calculated as the ratio of the amount of target products during the target period to the total amount of products completed during the target period, to the products.

[0090] The CO2 emissions of raw materials can vary depending on the type of raw material. The above-mentioned carbon dioxide emission calculation system (carbon dioxide emission calculation device) 1000, carbon dioxide emission calculation method, and carbon dioxide emission calculation program calculate the emissions for each type of raw material, so even if the CO2 emissions of raw materials differ depending on the type of raw material, the CO2 emissions of the product can be calculated with greater accuracy.

[0091] The raw materials consumed in a factory may include not only those used in the final product, but also those not used in the final product. For example, in a factory that manufactures metal materials as products, raw materials may be used for cleaning the melting furnace, heating the rolling mill, or as auxiliary materials. The carbon dioxide emission calculation system (carbon dioxide emission calculation device) 1000, carbon dioxide emission calculation method, and carbon dioxide emission calculation program described above take into account the CO2 emissions of the residual raw materials in the total emissions for the net period, so raw materials not used in the final product can also be taken into consideration when calculating CO2 emissions.

[0092] In the above, the net total emissions for the period were calculated by first determining the total amount of raw materials for beginning work-in-process, the total amount of raw materials for ending work-in-process, the total amount of raw materials for the period, and the net total amount of raw materials for the period, and then multiplying the net total amount of raw materials for the period by the raw material unit emissions in the final calculation. However, the net total emissions for the period may also be calculated by using the raw material unit emissions in each calculation to determine the total emissions for beginning work-in-process, the total emissions for ending work-in-process, and the total emissions for the period.

[0093] In this case, the total work-in-progress emissions calculation unit 12 extracts products that are work-in-progress at the beginning of the target period from among the multiple products based on the product performance information stored in the product information storage unit 51, determines the total amount of raw materials used to manufacture the extracted products as the total amount of raw materials for work-in-progress at the beginning of the period based on the raw material quantity information stored in the product information storage unit 51, and calculates the total amount of work-in-progress emissions at the beginning of the period by multiplying the calculated total amount of raw materials for work-in-progress at the beginning of the period by the raw material unit emissions. Based on the product performance information stored in the product information storage unit 51, it extracts products that are work-in-progress at the end of the target period from among the multiple products, determines the total amount of raw materials used to manufacture the extracted products as the total amount of raw materials for work-in-progress at the end of the period by multiplying the calculated total amount of raw materials for work-in-progress at the end of the period by the raw material unit emissions.

[0094] The total emissions calculation unit 13 extracts products from the plurality of products that were started to be manufactured during the target period based on the product performance information stored in the product information storage unit 51, determines the total amount of raw materials used to manufacture the extracted products as the total raw material amount for the period based on the raw material quantity information stored in the product information storage unit 51, and calculates the total emissions for the period by multiplying the determined total raw material amount for the period by the raw material unit emissions.

[0095] To illustrate the present invention, the embodiments have been adequately and fully described above with reference to the drawings. However, those skilled in the art should recognize that it is easy to modify and / or improve upon the embodiments described above. Therefore, unless such modifications or improvements implemented by those skilled in the art fall outside the scope of the claims, such modifications or improvements shall be considered to be included within the scope of the claims. [Explanation of Symbols]

[0096] 1000 Carbon Dioxide Emission Calculation System (An example of a carbon dioxide emission calculation device) 1 Control Processing Unit 2 Input section 3. Output section 4. Interface section (IF section) 5 Storage section 11 Control Unit 12. Work-in-Process Total Emission Calculation Unit 13. Total emissions calculation unit for the period 14 Net period total emissions calculation unit 15. Product Allocation Discharge Calculation Unit 51 Product information storage section

Claims

1. In a factory capable of manufacturing multiple types of products that are produced from raw materials through multiple processes, the CO2 of the target product during a target period among several different periods is measured. ２ A carbon dioxide emission calculation system for determining emissions, The aforementioned steps include shipping operations for shipping the completed products. For each of the aforementioned products, the CO2 used as raw material in the manufacture of the product ２ A product information storage unit stores product information including raw material emission information representing emissions and product performance information representing the completion date of each of the multiple processes carried out in the manufacture of the product. Based on the product information stored in the product information storage unit, the CO2 of the raw materials used in the manufacture of the work-in-progress product at the beginning of the target period. ２ The total amount of CO2 emissions and the amount of CO2 used in the production of raw materials for products that became work-in-progress at the end of the aforementioned period. ２ A work-in-process total emissions calculation unit calculates the total emissions for each as the beginning work-in-process total emissions and the ending work-in-process total emissions, respectively. Based on the product information stored in the product information storage unit, the CO2 of the raw materials used in the manufacture of the products that began production during the target period. ２ A total emissions calculation unit that determines the total amount of emissions as the total emissions for the period, A net period total emissions calculation unit calculates the difference between the beginning total emissions of work-in-process and the ending total emissions of work-in-process calculated by the aforementioned work-in-process total emissions calculation unit, and if the beginning total emissions of work-in-process are equal to or greater than the ending total emissions of work-in-process, it calculates the net period total emissions by adding the difference to the period total emissions calculated by the aforementioned period total emissions calculation unit, and if the beginning total emissions of work-in-process are less than or equal to the ending total emissions of work-in-process, it calculates the net period total emissions by subtracting the difference from the period total emissions calculated by the aforementioned period total emissions calculation unit, CO2 is allocated to the target product during the target period by multiplying the total net emissions calculated by the net period total emissions calculation unit by a predetermined percentage. ２ It includes a product allocation emissions calculation unit that determines emissions as product allocation emissions, A carbon dioxide emissions calculation system.

2. The aforementioned raw material discharge information includes raw material quantity information representing the amount of raw materials used in the manufacture of the product, The product allocation emission calculation unit, when determining the product allocation emission, determines the ratio of the amount of the target product during the target period to the total amount of products completed during the target period as the predetermined ratio. The carbon dioxide emission calculation system according to claim 1.

3. The aforementioned raw materials comprise multiple types of raw materials, The aforementioned product information further includes, for each of the aforementioned multiple products, raw material type information representing the types of raw materials used in the manufacture of the product, The aforementioned total work-in-process discharge calculation unit calculates, for each of the plurality of raw material types, the total beginning work-in-process discharge and the total ending work-in-process discharge for that raw material type, respectively. The aforementioned total emissions calculation unit calculates the total emissions for each of the plurality of raw material types for that raw material type for the period, The net period total emissions calculation unit calculates the net period total emissions for each of the plurality of raw material types, The product allocation emission calculation unit calculates CO2 emissions for the target product during the target period by multiplying the net period total emissions calculated by the net period total emissions calculation unit by a predetermined percentage for each type of raw material of the target product during the target period. ２ Emissions are calculated as product-allocated emissions. The carbon dioxide emission calculation system according to claim 1.

4. The aforementioned product information is the CO2 of the remaining raw materials obtained by subtracting the total amount of raw materials used in the manufacture of products whose manufacture began during the aforementioned period from the total amount of raw materials consumed at the aforementioned factory during the aforementioned period. ２ It further includes residual raw material emissions information that represents emissions, The net period total emission calculation unit includes the CO ２ emission of the remaining raw materials in the net period total emissions. The carbon dioxide emission calculation system according to claim 1.

5. The aforementioned raw material emission information includes raw material quantity information representing the amount of raw materials used in the manufacture of the product, and CO2 emissions per unit amount of the raw materials. ２ Includes unit emission information representing the unit emissions of raw materials, The Work-in-Process Total Emission Calculation Unit extracts products that are work-in-process at the beginning of the target period from among the multiple products based on the product performance information stored in the product information storage unit, determines the total amount of raw materials used to manufacture the extracted products as the beginning work-in-process raw material total amount based on the raw material quantity information stored in the product information storage unit, calculates the beginning work-in-process total emission by multiplying the calculated beginning work-in-process raw material total amount by the raw material unit emission rate, extracts products that are work-in-process at the end of the target period from among the multiple products based on the product performance information stored in the product information storage unit, determines the total amount of raw materials used to manufacture the extracted products as the ending work-in-process raw material total amount based on the raw material quantity information stored in the product information storage unit, calculates the ending work-in-process total emission by multiplying the calculated ending work-in-process raw material total amount by the raw material unit emission rate, The total emissions calculation unit for the period extracts products from among the multiple products that were manufactured during the target period based on the product performance information stored in the product information storage unit, determines the total amount of raw materials used to manufacture the extracted products as the total raw material amount for the period based on the raw material quantity information stored in the product information storage unit, and calculates the total emissions for the period by multiplying the determined total raw material amount for the period by the raw material unit emissions. The carbon dioxide emission calculation system according to claim 1.

6. The aforementioned raw material emission information includes raw material quantity information representing the amount of raw materials used in the manufacture of the product, and CO2 emissions per unit amount of the raw materials. ２ Includes unit emission information representing the unit emissions of raw materials, The Work-in-Process Total Discharge Calculation Unit extracts products that are work-in-process at the beginning of the target period from among the multiple products based on the product performance information stored in the product information storage unit, and calculates the total amount of raw materials used in the manufacture of the extracted products as the total amount of raw materials for the beginning of the work-in-process, which replaces the total work-in-process discharge at the beginning of the period, based on the product performance information stored in the product information storage unit, and extracts products that are work-in-process at the end of the target period from among the multiple products based on the product performance information stored in the product information storage unit, and calculates the total amount of raw materials used in the manufacture of the extracted products as the total amount of raw materials for the end of the work-in-process, which replaces the total work-in-process discharge at the end of the period, based on the raw material information stored in the product information storage unit. The total emissions calculation unit for the period extracts products from the plurality of products that were manufactured during the target period based on the product performance information stored in the product information storage unit, and determines the total amount of raw materials used in the manufacture of the extracted products as the total amount of raw materials for the period, which replaces the total emissions for the period, based on the raw material quantity information stored in the product information storage unit. The net period total emissions calculation unit calculates the difference between the total amount of raw materials for work-in-process at the beginning of the period and the total amount of raw materials for work-in-process at the end of the period, and if the total amount of raw materials for work-in-process at the beginning of the period is equal to or greater than the total amount of raw materials for work-in-process at the end of the period, it adds the difference calculated to the total amount of raw materials for the period calculated by the period total emissions calculation unit, and calculates the net period total emissions by multiplying the added result by the raw material unit emissions, and if the total amount of raw materials for work-in-process at the beginning of the period is less than or equal to the total amount of raw materials for work-in-process at the end of the period, it subtracts the difference calculated from the total amount of raw materials for the period calculated by the period total emissions calculation unit, and calculates the net period total emissions by multiplying the subtracted result by the raw material unit emissions. The carbon dioxide emission calculation system according to claim 1.

7. In a factory capable of manufacturing multiple types of products that are produced from raw materials through multiple processes, the CO2 of the target product during a target period among several different periods is measured. ２ A method for calculating carbon dioxide emissions to determine emissions, comprising a step for calculating total emissions for work in progress, a step for calculating total emissions for a period, a step for calculating total net emissions for a period, and a step for calculating allocated emissions for products, The aforementioned steps include shipping operations for shipping the completed products. Product information includes the CO2 content of the raw materials used in the manufacture of each of the aforementioned products. ２ This includes raw material emission information representing emissions and product performance information representing the completion date of each of the multiple processes carried out in the manufacturing of the product. The aforementioned work-in-progress total emissions calculation step involves calculating the CO2 emissions from raw materials used in the manufacture of products that were work-in-progress at the beginning of the target period, based on the product information. ２ The total amount of CO2 emissions and the amount of CO2 used in the production of raw materials for products that became work-in-progress at the end of the aforementioned period. ２ The total amount of emissions for each is calculated as the total emissions of beginning work-in-process and the total emissions of ending work-in-process, respectively. The aforementioned total emissions calculation step involves calculating the CO2 emissions of raw materials used in the manufacture of products that began production during the aforementioned period, based on the product information. ２ The total amount of emissions is calculated as the total emissions for the period. The net total period emissions calculation step calculates the difference between the beginning total work-in-process emissions and the ending total work-in-process emissions obtained in the total work-in-process emissions calculation step, and if the beginning total work-in-process emissions are equal to or greater than the ending total work-in-process emissions, the net total period emissions are calculated by adding the difference obtained to the total period emissions obtained in the total period emissions calculation step, and if the beginning total work-in-process emissions are less than or equal to the ending total work-in-process emissions, the net total period emissions are calculated by subtracting the difference obtained from the total period emissions obtained in the total period emissions calculation step. The product allocation emission calculation step involves multiplying the net period total emissions obtained in the net period total emission calculation step by a predetermined percentage to allocate CO2 to the target product during the target period. ２ Emissions are calculated as product-allocated emissions. Method for calculating carbon dioxide emissions.

8. In a factory capable of manufacturing multiple types of products that are produced from raw materials through multiple processes, the CO2 of the target product during a target period among several different periods is measured. ２ A carbon dioxide emission calculation program that determines the amount of emissions, A carbon dioxide emission calculation program for causing a computer to function as a carbon dioxide emission calculation system according to any one of claims 1 to 6.

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