Discharge amount calculation device, discharge amount calculation method, and discharge amount calculation program

Abstract

A discharge amount calculation unit (21) calculates a CO2 emission amount in each of a plurality of stages from construction to disposal of a building of interest. A means-setting unit (23) sets a reduction means having a CO2 emission reduction effect to a setting stage which is any of the plurality of stages. An influence identification unit (24) identifies an influence stage in which the set reduction means affects the CO2 emission amount and that includes a stage other than the setting stage as well. A discharge amount calculation unit (21) re-calculates the CO2 emission amount for the identified influence stage.

Description

Emissions calculation device, emissions calculation method, and emissions calculation program

[0001] The present disclosure relates to a technology for supporting the creation of a plan to keep CO2 emissions of a building below a target value.

[0002] The definitions of LCCM and ZCB have been established with a view to achieving carbon neutrality in the future. LCC stands for Life Cycle Carbon Negative. ZCB stands for Zero Carbon Building. LCCM and ZCB define the CO2 balance as being negative throughout a building's life cycle. The CO2 emissions referred to here are the amount of CO2 emitted minus the amount of CO2 reduction. The reduction amount refers to the amount of CO2 reduced through self-consumption of solar power generation or the sale of surplus electricity. The life cycle of a building extends from its construction to its disposal, specifically construction, operation, renovation, and disposal. The life cycle of a building may also include the procurement of raw materials prior to construction.

[0003] In order to achieve LCCM and ZCB, it is necessary to create a plan to keep CO2 emissions below target values. In order to create this plan, it is necessary to predict CO2 emissions at each stage of a building's life cycle. Patent Document 1 describes a method for calculating CO2 emissions at each stage of a building's life cycle based on the building's design data.

[0004] JP 2015-041117 A

[0005] In a drawn-up plan, if the value obtained by subtracting the CO2 reduction amount from the CO2 emissions does not fall below the target value, the introduction of reduction measures to reduce CO2 emissions is incorporated into the plan. It is necessary to predict the CO2 emissions when the reduction measures are introduced, but recalculating the CO2 emissions at all stages would require a long processing time. It is also possible to recalculate the CO2 emissions only for the stage at which the reduction measures are introduced. However, some reduction measures affect not only the CO2 emissions at the stage at which they are introduced, but also those at other stages. Therefore, recalculating the CO2 emissions only for the stage at which the reduction measures are introduced would make it impossible to predict an appropriate CO2 reduction amount. The present disclosure aims to enable accurate prediction of CO2 emissions when reduction measures are introduced while reducing processing time.

[0006] The emission calculation device according to the present disclosure comprises an emission calculation unit that calculates CO2 emissions for each of a plurality of stages from construction to disposal of a target building; a means setting unit that sets reduction measures that have a CO2 emission reduction effect at a set stage that is one of the plurality of stages; and an impact identification unit that identifies impact stages in which the reduction measures set by the means setting unit have an impact on CO2 emissions, including stages other than the set stage, and the emission calculation unit recalculates the CO2 emissions for the impact stages identified by the impact identification unit.

[0007] In this disclosure, the impact stage where the reduction measures affect CO2 emissions is identified, and the CO2 emissions are recalculated for the impact stage. This makes it possible to accurately predict the CO2 emissions when the reduction measures are introduced while reducing the processing time.

[0008] FIG. 1 is a configuration diagram of an emission amount calculation device 10 according to a first embodiment. FIG. 2 is a flowchart showing the processing flow of the emission amount calculation device 10 according to the first embodiment. FIG. 3 is a diagram showing an example of a reduction means according to the first embodiment. FIG. 4 is an explanatory diagram of influence range information 34 according to the first embodiment. FIG. 5 is a configuration diagram of an emission amount calculation device 10 according to a second embodiment. FIG. 6 is a flowchart showing the processing flow of the emission amount calculation device 10 according to the second embodiment. FIG. 7 is a flowchart showing the processing flow of the emission amount calculation device 10 according to the third embodiment. FIG. 8 is an explanatory diagram of influence range information 34 according to the third embodiment. FIG. 9 is a flowchart showing the processing flow of the emission amount calculation device 10 according to the fourth embodiment. FIG. 10 is a configuration diagram of an emission amount calculation device 10 according to a fifth embodiment. FIG. 11 is a flowchart showing the processing flow of the emission amount calculation device 10 according to the fifth embodiment.

[0009] Embodiment 1. An emissions calculation device 10 that calculates CO2 emissions from a target building will be described. In embodiment 1, the life cycle of a building will be described as including four stages: a construction stage, an operation stage, a renovation stage, and a disposal stage. The construction stage is a stage related to the construction of the target building, including the manufacture of materials for the target building and the construction of the target building. The operation stage is a stage related to the operation of energy, light, heat, water, etc. of the constructed target building. The renovation stage is a stage related to renovations such as repairs and replacements of the framework and equipment of the constructed target building. The disposal stage is a stage related to disposal such as the demolition and removal of the target building after operation has ended and waste treatment.

[0010] ***Description of Configuration*** The configuration of an emission amount calculation device 10 according to the first embodiment will be described with reference to Fig. 1. The emission amount calculation device 10 is a computer. The emission amount calculation device 10 includes the following hardware: a processor 11, a memory 12, a storage 13, and a communication interface 14. The processor 11 is connected to other hardware via signal lines and controls this other hardware.

[0011] The processor 11 is an IC that performs processing. IC stands for Integrated Circuit. Specific examples of the processor 11 include a CPU, a DSP, and a GPU. CPU stands for Central Processing Unit. DSP stands for Digital Signal Processor. GPU stands for Graphics Processing Unit.

[0012] The memory 12 is a storage device that temporarily stores data. Specific examples of the memory 12 include SRAM and DRAM. SRAM stands for Static Random Access Memory. DRAM stands for Dynamic Random Access Memory.

[0013] The storage 13 is a storage device that stores data. A specific example of the storage 13 is an HDD. HDD is an abbreviation for Hard Disk Drive. The storage 13 may also be a portable recording medium such as an SD (registered trademark) memory card, CompactFlash (registered trademark), NAND flash, a flexible disk, an optical disk, a compact disk, a Blu-ray (registered trademark) disk, or a DVD. SD is an abbreviation for Secure Digital. DVD is an abbreviation for Digital Versatile Disk.

[0014] The communication interface 14 is an interface for communicating with external devices. Specific examples of the communication interface 14 include Ethernet (registered trademark), USB, and HDMI (registered trademark) ports. USB stands for Universal Serial Bus. HDMI stands for High-Definition Multimedia Interface.

[0015] The emission calculation device 10 includes, as functional components, an emission calculation unit 21, a target determination unit 22, a means setting unit 23, and an impact identification unit 24. The functions of each functional component of the emission calculation device 10 are realized by software. The emission calculation unit 21 includes a construction calculation unit 211, an operation calculation unit 212, a modification calculation unit 213, and a disposal calculation unit 214. The storage 13 stores programs that realize the functions of each functional component of the emission calculation device 10. These programs are read into the memory 12 by the processor 11 and executed by the processor 11. In this way, the functions of each functional component of the emission calculation device 10 are realized.

[0016] The storage 13 stores design information 31, operation plan information 32, modification plan information 33, and impact range information 34.

[0017] 1 shows only one processor 11. However, there may be a plurality of processors 11, and the plurality of processors 11 may cooperate to execute programs that realize the respective functions.

[0018] ***Description of Operation*** The operation of the emission calculation device 10 according to the first embodiment will be described with reference to Figures 2 to 4. The operating procedure of the emission calculation device 10 according to the first embodiment corresponds to the emission calculation method according to the first embodiment. Furthermore, the program that realizes the operation of the emission calculation device 10 according to the first embodiment corresponds to the emission calculation program according to the first embodiment.

[0019] The processing flow of the emission calculation device 10 according to the first embodiment will be described with reference to FIG. 2 . (Step S11: Design Information Acquisition Process) The emission calculation unit 21 acquires design information 31, operation plan information 32, and renovation plan information 33 for the target building. Specifically, the emission calculation unit 21 acquires the design information 31, operation plan information 32, and renovation plan information 33 for the target building input by a user. The user may be, for example, a building designer. The design information 31 includes BIM data, CAD data, and information indicating the total floor area, number of floors, etc. BIM stands for Building Information Modeling. CAD stands for Computer-Aided Design. The operation plan information 32 is information that defines the operation method for the energy of the target building and the facilities related to light, heat, and water. The renovation plan information 33 is information that defines the renovation method and timing of each part of the target building.

[0020] (Step S12: Emission amount calculation process) The emission amount calculation unit 21 calculates the CO2 emissions for each of the multiple stages from construction to disposal of the target building based on the design information 31, operation plan information 32, and renovation plan information 33 acquired in step S11. Specifically, the construction calculation unit 211 calculates the CO2 emissions for the construction stage of the target building based on the design information 31. The operation calculation unit 212 calculates the CO2 emissions for the operation stage of the target building based on the design information 31 and the operation plan information 32. The renovation calculation unit 213 calculates the CO2 emissions for the renovation stage of the target building based on the design information 31 and the renovation plan information 33. The disposal calculation unit 214 calculates the CO2 emissions for the disposal stage of the target building based on the design information 31.

[0021] Here, CO2 emissions include not only the CO2 emissions generated by consuming energy, etc., but also the CO2 emissions reduced by power generation. In other words, CO2 emissions are the amount of CO2 emitted minus the amount of CO2 emissions reduced. The amount of reduction can be obtained, for example, by introducing solar power generation.

[0022] (Step S13: Target Determination Processing) The target determination unit 22 determines whether the total amount of CO2 emissions at each of the multiple stages calculated in step S22 is equal to or less than the target amount. Specifically, the target determination unit 22 calculates the total amount by adding up the CO2 emissions at each stage calculated in step S22. That is, the target determination unit 22 calculates the total amount by adding up the CO2 emissions at the construction stage, the CO2 emissions at the operation stage, the CO2 emissions at the renovation stage, and the CO2 emissions at the disposal stage. The target determination unit 22 determines whether the total amount is equal to or less than the target amount. The target amount is a value set in advance. For example, if the goal is to achieve LCCM and ZCB, the target amount is 0. If the total amount is equal to or less than the target amount, the target determination unit 22 presents the reduction measures set so far in step S14, which will be described later, and ends the processing. On the other hand, if the total amount is greater than the target amount, the target determination unit 22 proceeds to step S14.

[0023] (Step S14: Means Setting Process) The means setting unit 23 sets a reduction means that has a CO2 emission reduction effect at a set stage, which is one of the multiple stages. Specifically, the means setting unit 23 sets one reduction means to be used from multiple reduction means prepared for each stage as shown in Fig. 3. For example, the means setting unit 23 sets a reduction means designated by the user.

[0024] (Step S15: Impact Identification Processing) The impact identification unit 24 identifies an impact stage, which is a stage at which the reduction measures set in step S14 affect CO2 emissions. Here, the impact identification unit 24 identifies impact stages that include stages other than the set stage corresponding to the reduction measures set in step S14. Specifically, the impact identification unit 24 refers to the impact range information 34 to identify the impact stage. As shown in FIG. 4, the impact range information 34 indicates the stage at which each of a plurality of reduction measures affects CO2 emissions. In FIG. 4, the set stage, which is a stage corresponding to the reduction measure, is marked with a diagonal line, as it naturally has the effect of reducing CO2 emissions. For stages other than the set stage, an impact (◯) or no impact (X) is set. An impact means that CO2 emissions will increase or decrease.

[0025] The following are specific examples of impacts on CO2 emissions other than those in the installation stage: (1) During the construction stage, changing materials from steel to wood changes the insulation properties. This impacts CO2 emissions during the operation stage. (2) During the operation stage, changing the operating hours of equipment changes the equipment's useful life. This impacts CO2 emissions during the renovation stage. (3) During the renovation stage, extending the renovation cycle from 10 years to 13 years. In this case, CO2 emissions during the renovation stage are reduced. However, old equipment will be in operation for 11 to 13 years after installation, which impacts CO2 emissions during the operation stage.

[0026] The impact identification unit 24 instructs the emission calculation unit 21 to recalculate the CO2 emission amount for the identified impact stage, and returns the process to step S12. Then, in step S12, the emission calculation unit 21 recalculates the CO2 emission amount using the reduction means set in step S14.

[0027] In this way, reduction measures are added until the total amount of CO2 emissions at each stage is equal to or less than the target amount. This gradually refines the plan for each stage, and ultimately leads to a plan that will bring the total amount of CO2 emissions below the target amount.

[0028] The calculation method for CO2 emissions at each stage in step S12 of FIG. 2 will be described. (Construction Stage) The emission calculation unit 21 calculates the CO2 emissions for each building material, such as concrete and steel frame. First, the emission calculation unit 21 calculates the quantity of each building material from the design information 31. Then, for each building material, the emission calculation unit 21 multiplies the calculated quantity by a CO2 conversion factor to calculate the CO2 emissions for that building material. The emission calculation unit 21 also calculates the CO2 emissions associated with the transportation of each building material. For each building material, the emission calculation unit 21 calculates the CO2 emissions associated with the transportation of that building material by multiplying the transportation volume by the transportation distance by the CO2 conversion factor. Note that, for each building material, if the production location can be identified, the emission calculation unit 21 identifies the distance from the production location to the construction site as the transportation distance. If the production location cannot be identified, the emission calculation unit 21 may use a predetermined distance as the transportation distance. The emission calculation unit 21 calculates the CO2 emissions during the construction stage by adding up the CO2 emissions for each building material and the CO2 emissions associated with the transportation of each building material. Note that the CO2 conversion coefficient may use information set in the emission intensity database.

[0029] (Operation Phase) The emission calculation unit 21 acquires the layout, area, insulation properties of walls and windows of each room, and the capacity of equipment installed in each room from the design information 31. The emission calculation unit 21 also acquires information on the average annual climate of the area where the target building is located from a server such as the Japan Meteorological Agency. Using the acquired information, the emission calculation unit 21 estimates the annual energy consumption of each piece of equipment when the building is operated according to the plan indicated in the operation plan information 32. The pieces of equipment include air conditioners, ventilation systems, lighting systems, hot water heaters, elevators, etc. The energy consumption can be estimated using a simulator that recreates a digital twin of the building and estimates the energy consumption of each piece of equipment. The emission calculation unit 21 calculates the energy consumption of the target building from its construction to its abandonment from the estimated annual energy consumption. The period from its construction to its abandonment is, for example, 50 years. The emission calculation unit 21 may multiply the annual energy consumption by the number of years from its construction to its abandonment to calculate the energy consumption for that period. Alternatively, for each year since construction, the energy consumption for that year may be calculated by multiplying the energy consumption by a coefficient that takes into account the deterioration of each piece of equipment, and the calculated energy consumption may be summed up to calculate the energy consumption for that period. The emission calculation unit 21 calculates the CO2 emissions by multiplying the energy consumption from the construction of the target building to its disposal by a CO2 conversion coefficient. The CO2 conversion coefficient may be a value according to the electric power company with which the target building has a contract.

[0030] In the operation phase, measures to reduce CO2 emissions may be installed. For example, the target building may be equipped with a solar power generation facility. If a solar power generation facility is installed, the emission calculation unit 21 acquires the capacity, installation location, installation envelope, and installation angle of the solar power generation facility from the design information 31. The emission calculation unit 21 also acquires the average annual amount of solar radiation and duration of sunlight in the area where the target building is located from a server such as the Japan Meteorological Agency. The emission calculation unit 21 estimates the power generation energy using the acquired information. The emission calculation unit 21 multiplies the estimated power generation energy by a CO2 conversion coefficient to calculate the amount of CO2 reduction. The emission calculation unit 21 then subtracts the amount of reduction from the above-mentioned CO2 emissions to calculate the CO2 emissions in the operation phase.

[0031] (Renovation Stage) The emission calculation unit 21 identifies the number of updates and the number of updates for each building material and each piece of equipment from the renovation plan information 33. The renovation plan information 33 sets the timing of updates for each building material and piece of equipment based on its lifespan, etc. The emission calculation unit 21 calculates the CO2 emissions for each building material and piece of equipment by multiplying the number of updates by the number of updates and multiplying the result by a CO2 conversion coefficient. The emission calculation unit 21 calculates the CO2 emissions in the renovation stage by adding up the CO2 emissions calculated for each building material and piece of equipment. It is possible to obtain the CO2 conversion coefficient from the emission intensity database used in the construction stage.

[0032] (Disposal stage) The emission calculation unit 21 calculates the total floor area and amount of waste of the target building from the design information 31. The emission calculation unit 21 calculates the CO2 conversion factor in the disposal stage by multiplying the total floor area and the amount of waste by the CO2 conversion factor for demolition and landfill. Note that the CO2 conversion factor may use information set in the emission intensity database used to calculate the CO2 emissions in the construction stage.

[0033] At each stage, costs may be calculated in addition to CO2 emissions. By showing the calculated costs to the user, it becomes easier to select reduction measures taking costs into consideration. The method for calculating costs at each stage will now be described.

[0034] (Construction Stage) The emission calculation unit 21 calculates the cost for each building material and each piece of equipment. First, the emission calculation unit 21 calculates the quantity of each building material and each piece of equipment from the design information 31. Then, for each building material and each piece of equipment, the emission calculation unit 21 multiplies the calculated quantity by the unit price to calculate the cost of that building material or piece of equipment. The emission calculation unit 21 calculates the cost of transporting each building material and each piece of equipment. For each building material and each piece of equipment, the emission calculation unit 21 calculates the number of trucks from the transport volume. The emission calculation unit 21 multiplies the number of trucks by the transport distance and then multiplies this by the transport unit price (gasoline cost + labor cost) to calculate the cost of transportation. The emission calculation unit 21 calculates the cost of construction work (labor cost). The emission calculation unit 21 calculates the total floor area of ​​the target building from the design information 31. The emission calculation unit 21 multiplies the total floor area by the work unit price (yen / m ２ The emission calculation unit 21 calculates the cost during the construction stage by adding up the cost of each building material and each piece of equipment, the cost of transporting each building material and each piece of equipment, and the cost of construction work.

[0035] (Operation Phase) The emission calculation unit 21 calculates the energy purchased and energy sold for one year from the energy consumed and energy generated for one year. The emission calculation unit 21 calculates the contracted power (kW) and the amount of power used (kWh) from the energy purchased for one year, and multiplies each by the basic fee (yen / kW) and the energy charge (yen / kWh) to calculate the cost of purchasing power. The emission calculation unit 21 also multiplies the energy sold for one year by the power selling price (yen / kWh) to calculate the cost of selling power. The costs of purchasing and selling power are added together to calculate the cost in the operation phase.

[0036] (Renovation Stage) The emission calculation unit 21 identifies the number of updates and the number of updates for each building material and each piece of equipment from the renovation plan information 33. For each building material and piece of equipment, the emission calculation unit 21 multiplies the number of updates multiplied by the number of updates and then multiplies the result by the unit price to calculate the cost of that building material or equipment. In addition, the emission calculation unit 21 calculates the transportation costs and the work costs, just as in the construction stage. Then, the emission calculation unit 21 calculates the costs for each building material and piece of equipment, the transportation costs for each building material and piece of equipment, and the work costs to calculate the costs in the renovation stage.

[0037] (Disposal Stage) The emission calculation unit 21 calculates the total floor area and the amount of waste of the target building from the design information 31. The emission calculation unit 21 multiplies the total floor area and the amount of waste by the unit price to calculate the cost in the disposal stage.

[0038] The method for selecting a reduction measure in step S14 of FIG. 2 will now be described. As described above, the user may be allowed to select any reduction measure. However, the means setting unit 23 may preferentially select a reduction measure extracted by any of the following methods (Method 1) to (Method 3). For example, the means setting unit 23 may display the reduction measures extracted by any of the following methods (Method 1) to (Method 3) and allow the user to select the reduction measure to be set. Furthermore, the means setting unit 23 may set any reduction measure from the reduction measures extracted by any of the following methods (Method 1) to (Method 3).

[0039] (Method 1) The means setting unit 23 extracts reduction means that shorten the processing time required for recalculating the CO2 emissions. Reduction means that shorten the processing time required for recalculating the CO2 emissions are reduction means that have no or few impacts on the stages. For example, the means setting unit 23 extracts reduction means that have the fewest impacts on the stages.

[0040] (Method 2) The means setting unit 23 extracts reduction means that result in the largest reduction in CO2 emissions. Specifically, a reference value for the amount of CO2 emission reduction for each reduction means is stored in the list of reduction means shown in Figure 3. The means setting unit 23 refers to this reference value and extracts the reduction means with the largest reduction amount, a reference number of reduction means starting from the largest reduction amount, or all reduction means with reduction amounts greater than the reference amount. The reference value for the amount of CO2 emission reduction is calculated by averaging the results of trial calculations of reduction amounts for multiple buildings designed in the past, by total floor area, etc. By preferentially selecting reduction means with the largest reduction amount, it is possible to make the total amount below the target amount using fewer reduction means. As a result, the processing time required to recalculate CO2 emissions can be shortened.

[0041] (Method 3) The means setting unit 23 extracts low-cost reduction means. Specifically, a reference value of cost for each reduction means is stored in a list of reduction means shown in FIG. 3. The means setting unit 23 refers to this reference value and extracts the lowest-cost reduction means, a reference number of reduction means starting from the lowest cost, or all reduction means whose costs are less than the reference value. The reference cost value is calculated by averaging the estimated cost results for multiple buildings designed in the past, based on the total floor area, etc.

[0042] ***Effects of First Embodiment*** As described above, the emission calculation device 10 according to the first embodiment identifies the impact stage at which the reduction measures affect the CO2 emissions, and recalculates the CO2 emissions only for the impact stage. This makes it possible to accurately predict the CO2 emissions when the reduction measures are introduced while minimizing the processing time.

[0043] ***Other configurations***

[0044] <Modification 1> In the first embodiment, each functional component is realized by software. However, in Modification 1, each functional component may be realized by hardware. The following describes the differences between Modification 1 and the first embodiment.

[0045] When each functional component is realized by hardware, the emission calculation device 10 includes an electronic circuit instead of the processor 11, the memory 12, and the storage 13. The electronic circuit is a dedicated circuit that realizes the functions of each functional component, the memory 12, and the storage 13.

[0046] Possible electronic circuits include a single circuit, a composite circuit, a programmed processor, a parallel programmed processor, a logic IC, a GA, an ASIC, and an FPGA. GA stands for Gate Array. ASIC stands for Application Specific Integrated Circuit. FPGA stands for Field-Programmable Gate Array. Each functional component may be realized by a single electronic circuit, or each functional component may be distributed across multiple electronic circuits.

[0047] <Modification 2> As a modification 2, some of the functional components may be realized by hardware, and other functional components may be realized by software.

[0048] The processor 11, the memory 12, the storage 13, and the electronic circuitry are collectively referred to as a processing circuit. In other words, the functions of the respective functional components are realized by the processing circuit.

[0049] Furthermore, the term "unit" in the above description may be read as a "circuit," "step," "procedure," "process," or "processing circuit."

[0050] Second Embodiment The second embodiment differs from the first embodiment in that newly added reduction measures are set in the influence extent information 34. In the second embodiment, this difference will be explained, and explanation of the same points will be omitted.

[0051] ***Description of Configuration*** The configuration of the emission calculation device 10 according to the second embodiment will be described with reference to Figure 5. The emission calculation device 10 differs from the emission calculation device 10 shown in Figure 1 in that it includes an influence range setting unit 25 as a functional component. The function of the influence range setting unit 25, like the other functional components, is realized by software or hardware.

[0052] ***Description of Operation*** The flow of processing by the emission calculation device 10 according to the second embodiment will be described with reference to Figure 6. The processing shown in Figure 6 is executed as a preliminary preparation for the processing shown in Figure 2. (Step S21: New Measure Determination Processing) The impact range setting unit 25 determines whether or not a new reduction measure has been added. A new reduction measure is set by the user at any timing. At this time, the new reduction measure is associated with one of the stages. If a new reduction measure has been added, the impact range setting unit 25 proceeds with the processing to step S22. On the other hand, if a new reduction measure has not been added, the impact range setting unit 25 ends the processing.

[0053] The processes of steps S22 and S23 are executed for each new reduction means.

[0054] (Step S22: Emission amount calculation process) The emission amount calculation unit 21 calculates the CO2 emissions at each of multiple stages when the target new reduction measures are applied to a past building, which is a building designed in the past. In other words, the emission amount calculation unit 21 calculates the CO2 emissions when the target new reduction measures are applied for all stages. The emission amount calculation unit 21 calculates the CO2 emissions when the target new reduction measures are not applied to the past building. If the CO2 emissions when the target new reduction measures are not applied are stored in storage 13, etc., the emission amount calculation unit 21 simply reads out the stored CO2 emissions. In principle, the case when the new reduction measures are applied and the case when the target new reduction measures are not applied are the same except for whether the new reduction measures are applied or not.

[0055] (Step S23: Influence range setting process) The influence range setting unit 25 calculates the difference between the CO2 emissions when the target new reduction measure is applied and the CO2 emissions when the new reduction measure is not applied, for each of multiple stages other than the stage corresponding to the target new reduction measure. The influence range setting unit 25 identifies, among the multiple stages, a stage where the difference is equal to or greater than a standard as a stage that will affect the CO2 emissions for the new reduction measure. Then, the influence range setting unit 25 adds the new reduction measure to the influence range information 34. At this time, the influence range setting unit 25 marks the corresponding stage for the new reduction measure with a diagonal line, marks the identified stage with an impact (◯), and marks the remaining stages with no impact (X).

[0056] ***Effects of Second Embodiment*** As described above, when a new reduction measure is added, the emission calculation device 10 according to the second embodiment identifies the affected stage and adds the affected stage to the impact extent information 34. This makes it possible to appropriately identify the affected stage even when a new reduction measure is added.

[0057] Embodiment 3. Embodiment 3 differs from Embodiments 1 and 2 in that, with regard to the operation stage, affected equipment is identified and the CO2 emissions are recalculated only for the identified equipment. Embodiment 3 will explain this difference, and will omit explanation of the same points. In Embodiment 3, a case where a function is added to Embodiment 1 will be explained. However, it is also possible to add a function to Embodiment 2.

[0058] ***Description of Operation*** The processing flow of the emission calculation device 10 according to the third embodiment will be described with reference to Fig. 7. The processing from step S31 to step S35 is the same as the processing from step S11 to step S15 in Fig. 2. However, in step S35, the impact identification unit 24 does not instruct the emission calculation unit 21 to recalculate the CO2 emission amounts for the impact stages that have not yet been identified.

[0059] (Step S36: Operation Stage Determination Process) The impact identification unit 24 determines whether the operation stage is included in the impact stages identified in step S35. If the operation stage is included in the impact stages, the impact identification unit 24 proceeds to step S37. On the other hand, if the operation stage is not included in the impact stages, the impact identification unit 24 instructs the emission calculation unit 21 to recalculate the CO2 emissions for the identified impact stages, and returns the process to step S32. Then, in step S32, the emission calculation unit 21 recalculates the CO2 emissions using the reduction means set in step S34.

[0060] (Step S37: Equipment Identification Processing) The impact identification unit 24 identifies equipment that is affected by the reduction measures set in step S34 as affected equipment. Specifically, the impact identification unit 24 identifies affected equipment by referring to the impact range information 34. As shown in Fig. 8 , the impact range information 34 indicates the stage at which each of the multiple reduction measures has an impact on CO2 emissions, and also indicates whether or not there is an impact on each piece of equipment at each operation stage.

[0061] The impact identification unit 24 instructs the emission calculation unit 21 to recalculate the CO2 emissions for the identified impact stage, and returns the process to step S32. At this time, for the operation stage, the impact identification unit 24 specifies the affected equipment and instructs the emission calculation unit 21 to recalculate the CO2 emissions. Then, in step S32, the emission calculation unit 21 recalculates the CO2 emissions using the reduction means set in step S34. For the operation stage, the emission calculation unit 21 recalculates the CO2 emissions for the affected equipment, thereby recalculating the CO2 emissions for the operation stage.

[0062] ***Effects of Embodiment 3*** As described above, in the operation stage, the emission calculation device 10 according to Embodiment 3 identifies affected equipment where the reduction measures have an impact on CO2 emissions, and recalculates the CO2 emissions only for the affected equipment. This makes it possible to accurately predict the CO2 emissions when the reduction measures are introduced while reducing the processing time more than in the configuration of Embodiment 1.

[0063] Embodiment 4. Embodiment 4 differs from embodiments 1 to 3 in that affected areas are identified and CO2 emissions are recalculated only for the identified areas. In embodiment 4, this difference will be explained, and explanations of the same points will be omitted. In embodiment 4, a case where a function is added to embodiment 1 will be explained. However, it is also possible to add a function to embodiments 2 and 3.

[0064] The processing flow of the emission calculation device 10 according to the fourth embodiment will be described with reference to Fig. 9. The processing from step S41 to step S45 is the same as the processing from step S11 to step S15 in Fig. 2. However, in step S45, the impact identification unit 24 does not instruct the emission calculation unit 21 to recalculate the CO2 emission amounts for the impact stages that have not yet been identified.

[0065] (Step S46: Area Identification Processing) The impact identification unit 24 identifies an area that will be affected by the reduction measures set in step S44 as an affected area, that is, as affected equipment. Specifically, the impact identification unit 24 identifies the affected area by, for example, having the user specify an area where the reduction measures will be introduced. For example, when the floor on which the reduction measures will be introduced has been determined, the impact identification unit 24 identifies the floor on which the reduction measures will be introduced as the affected area.

[0066] The impact identification unit 24 instructs the emission calculation unit 21 to recalculate the CO2 emission amount for the identified impact stage, and returns the process to step S42. At this time, the impact identification unit 24 specifies the impact area and instructs the emission calculation unit 21 to recalculate the CO2 emission amount. Then, in step S42, the emission calculation unit 21 recalculates the CO2 emission amount for the impact area using the reduction means set in step S44, thereby recalculating the CO2 emission amount.

[0067] ***Effects of Embodiment 4*** As described above, the emission calculation device 10 according to Embodiment 4 identifies the areas affected by the reduction measures and recalculates the CO2 emissions only for the affected areas. This makes it possible to accurately predict the CO2 emissions when the reduction measures are introduced while reducing the processing time more than in the configuration of Embodiment 1.

[0068] Fifth Embodiment The fifth embodiment differs from the first to fourth embodiments in that, when the operation plan information 32 is changed by the reduction means, the modification plan information 33 is changed based on the changed operation plan information 32. In the fourth embodiment, this difference will be explained, and explanations of the same points will be omitted. In the fifth embodiment, a case where a function is added to the first embodiment will be explained. However, it is also possible to add a function to the second to fourth embodiments.

[0069] ***Description of Configuration*** The configuration of the emission calculation device 10 according to the fifth embodiment will be described with reference to Figure 10. The emission calculation device 10 differs from the emission calculation device 10 shown in Figure 1 in that it includes a modification plan change unit 26 as a functional component. The function of the modification plan change unit 26, like the other functional components, is realized by software or hardware.

[0070] ***Description of Operation*** The processing flow of the emission calculation device 10 according to the fifth embodiment will be described with reference to Figure 11. The processing from step S51 to step S55 is the same as the processing from step S11 to step S15 in Figure 2. However, in step S35, the impact identification unit 24 does not instruct the emission calculation unit 21 to recalculate the CO2 emission amounts for the impact stages that have not yet been identified.

[0071] (Step S56: Operation Stage Determination Process) The impact identification unit 24 determines whether the setting stage corresponding to the reduction means set in step S54 is the operation stage. If the setting stage is the operation stage, the impact identification unit 24 proceeds to step S37. On the other hand, if the setting stage is not the operation stage, the impact identification unit 24 instructs the emission calculation unit 21 to recalculate the CO2 emission amount for the identified impact stage, and returns the process to step S52. Then, in step S52, the emission calculation unit 21 recalculates the CO2 emission amount using the reduction means set in step S54.

[0072] (Step S57: Renovation Plan Change Processing) The renovation plan change unit 26 identifies the impact of the change in the operation stage made by the reduction means on the renovation stage and changes the plan for the renovation stage in accordance with the identified impact. Specifically, the operation plan information 32 may be changed by the reduction means. The renovation plan change unit 26 identifies the changes made to the operation plan information 32 made by the reduction means and changes the renovation plan information 33, which is the plan for the renovation stage, in accordance with the identified changes. For example, the renovation plan change unit 26 may change the useful life of each piece of equipment in accordance with the operation plan and change the renovation plan so that renovations are performed at a frequency in accordance with the useful life. The useful lives of building equipment such as air conditioners, ventilation systems, and lighting equipment vary depending on the operation plan. As a specific example, equipment that operates 24 hours a day has a short useful life, but the useful life can be extended by shortening the operating hours. Furthermore, equipment that is frequently switched on / off or has its settings changed has a short useful life, but the useful life can be extended by reducing the frequency of switching on / off or changing its settings. Extending the service life means that repairs will need to be carried out less frequently.

[0073] The impact identification unit 24 instructs the emission calculation unit 21 to recalculate the CO2 emission amount for the identified impact stage, and returns the process to step S52. Then, in step S52, the emission calculation unit 21 recalculates the CO2 emission amount by using the reduction means set in step S54. At this time, the emission calculation unit 21 recalculates the CO2 emission amount for the renovation stage based on the changed plan.

[0074] ***Effects of Embodiment 5*** As described above, when the operation plan information 32 is changed by the reduction means, the emission calculation device 10 according to Embodiment 5 changes the modification plan information 33 based on the changed operation plan information 32. This allows the CO2 emission amount to be calculated based on an appropriate modification plan, making it possible to appropriately calculate the CO2 emission amount.

[0075] The embodiments and modifications of the present disclosure have been described above. Some of these embodiments and modifications may be combined and implemented. Furthermore, one or more of them may be implemented partially. Note that the present disclosure is not limited to the above embodiments and modifications, and various modifications are possible as needed.

[0076] 10 Emission amount calculation device, 11 Processor, 12 Memory, 13 Storage, 14 Communication interface, 21 Emission amount calculation unit, 211 Construction calculation unit, 212 Operation calculation unit, 213 Renovation calculation unit, 214 Disposal calculation unit, 22 Goal determination unit, 23 Means setting unit, 24 Impact identification unit, 25 Impact range setting unit, 26 Renovation plan change unit, 31 Design information, 32 Operation plan information, 33 Renovation plan information, 34 Impact range information.

Claims

1. An emission calculation device that calculates the CO₂ emissions at each of a plurality of stages from the construction to the disposal of a target building, a means setting unit that sets reduction means having a CO₂ emission reduction effect at a set stage which is any one of the plurality of stages, and an influence specifying unit that specifies an influence stage which is a stage other than the set stage and in which the reduction means set by the means setting unit affects the CO₂ emissions, wherein the emission calculation unit recalculates the CO₂ emissions using the reduction means set by the means setting unit for the influence stage specified by the influence specifying unit.

2. The emission calculation device according to claim 1, further comprising a target determination unit that determines whether or not the total amount of the CO₂ emissions at each of the plurality of stages calculated by the emission calculation unit is equal to or less than a target amount, and wherein the means setting unit sets new reduction means until the target determination unit determines that the total amount is equal to or less than the target amount.

3. The emission calculation device according to claim 1 or 2, wherein the influence specifying unit specifies the influence stage for the reduction means by referring to influence range information indicating a stage in which there is an influence on the CO₂ emissions for each of the plurality of reduction means.

4. When new reduction means is added, the emission calculation unit calculates the CO₂ emissions at each of the plurality of stages for a past building, which is a building designed in the past, when the new reduction means is applied to the past building. The emission calculation device further comprises an influence range setting unit that adds, to the influence range information, a stage in which the difference between the CO₂ emissions when the new reduction means is applied and the CO₂ emissions when the new reduction means is not applied among the plurality of stages is equal to or greater than a reference as a stage in which there is an influence on the CO₂ emissions for the new reduction means.

5. The plurality of stages includes an operation stage for operating the target building. When the operation stage is included in the impact stage, the impact identifying unit identifies, as affected facilities, the facilities among the facilities used in the operation stage that are affected by the reduction means. The emission amount calculating unit recalculates the CO₂ emission amount for the operation stage by recalculating the CO₂ emission amount for the affected facilities in the operation stage. The emission amount calculating apparatus according to any one of claims 1 to 4.

6. The impact identifying unit identifies, as an affected area, the area in the target building that is affected by the reduction means. The emission amount calculating unit recalculates the CO₂ emission amount for the affected stage by recalculating the CO₂ emission amount for the affected area in the impact stage. The emission amount calculating apparatus according to any one of claims 1 to 5.

7. The plurality of stages includes an operation stage for operating the target building and a renovation stage for renovating the target building. The emission amount calculating apparatus further includes a renovation plan changing unit that, when the setting stage is the operation stage, identifies the impact that the change in the operation stage by the reduction means has on the renovation stage and changes the plan for the renovation stage according to the identified impact. When the plan for the renovation stage is changed by the renovation plan changing unit, the emission amount calculating unit recalculates the CO₂ emission amount for the renovation stage based on the changed plan. The emission amount calculating apparatus according to any one of claims 1 to 6.

8. A computer calculates the CO₂ emission amount at each of a plurality of stages from the construction to the disposal of a target building, sets reduction means having a CO₂ emission reduction effect at a setting stage that is any one of the plurality of stages, identifies an impact stage in which the reduction means affects the CO₂ emission amount and includes stages other than the setting stage, and recalculates the CO₂ emission amount using the reduction means for the impact stage. A method for calculating emission amounts.

9. A computer functions as an emission calculation device that performs an emission calculation process for calculating CO2 emissions at each of a plurality of stages from the construction to the disposal of a target building, a means setting process for setting reduction means having a CO2 emission reduction effect at a setting stage that is any one of the plurality of stages, and an influence identification process for identifying an influence stage that is an influence stage in which the reduction means set by the means setting process affects CO2 emissions and includes stages other than the setting stage. In the emission calculation process, an emission calculation program that recalculates the CO2 emissions using the reduction means set by the means setting process for the influence stage identified by the influence identification process.

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