A simplified method for calculating BEI, a building design method including that method, and a simplified BEI calculation system.
The simplified BEI calculation method using virtual rooms and specifications addresses the inefficiencies of detailed design-dependent methods, enabling quick energy-saving assessments and compliant building designs.
Patent Information
- Authority / Receiving Office
- JP · JP
- Patent Type
- Patents
- Current Assignee / Owner
- SUMITOMO MITSUI CONSTRUCTION CO LTD
- Filing Date
- 2024-05-09
- Publication Date
- 2026-06-17
Smart Images
Figure 0007875233000003 
Figure 0007875233000004 
Figure 0007875233000005
Abstract
Description
Technical Field
[0001] The present invention relates to a method for simply calculating BEI (Building Energy Index), a building design method including the method, and a BEI simple calculation system.
Background Art
[0002] BEI is the ratio of the primary energy consumption of a designed building compared to a reference building based on an energy consumption performance calculation program. BEI is (Designed primary energy consumption - Other primary energy consumption) / (Reference primary energy consumption - Other primary energy consumption). Here, "Designed primary energy consumption" is the primary energy consumption calculated based on the actual building design specifications, "Reference primary energy consumption" is the standard primary energy consumption determined for each facility, region, and room use, and "Other primary energy consumption" is the energy consumption of office equipment and home appliances, etc. It is judged that a smaller BEI indicates higher energy-saving performance of the building.
[0003] Laws regarding the improvement of building energy consumption performance have been enacted, and for buildings of a predetermined scale or more, it is required to make BEI less than or equal to a predetermined value. Furthermore, in some cases, a ZEB (Net Zero Energy Building), which aims to make the annual balance of primary energy consumed in the building zero, is required.
[0004] To perform energy-saving calculations including the calculation of BEI, basic designs such as building drawings and heat insulation ranges, and basic designs of various facilities are required (see, for example, Non-Patent Document 1). Table 1 shows conventional energy-saving calculation procedures and required times.
Table 1
[0005] As shown in Table 1, it takes approximately 14 days for a specialist company that receives information on the basic design to perform energy conservation calculations and produce results, during which time work cannot be carried out. Furthermore, if the building design is carried out during this time, and the BEI (Building Energy Index) does not fall below the target value as a result of the calculations, the basic design will need to be redone, and much of the work done during this period will be wasted.
[0006] Patent Document 1 describes a method for calculating predicted energy-saving performance by automatically filling in missing input data for unentered items, so that the energy-saving performance of a building can be predicted even when the basic design is incomplete. [Prior art documents] [Patent Documents]
[0007] [Patent Document 1] Japanese Patent Publication No. 2023-147393 [Non-patent literature]
[0008] [Non-Patent Document 1] Ministry of Land, Infrastructure, Transport and Tourism, National Institute for Land and Infrastructure Management; National Research and Development Agency, Building Research Institute (eds. and publishers), "Energy Consumption Performance Calculation Program (Non-Residential Version) Model Building Method Input Manual," Ver. 3.6, April 2024. [Overview of the project] [Problems that the invention aims to solve]
[0009] However, the method described in Patent Document 1 requires basic building design, including setting insulation specifications and selecting air conditioners and lighting fixtures, and therefore a further simplified method for calculating BEI was needed.
[0010] In view of the above background, the present invention aims to provide a simplified method for calculating BEI that can be calculated even in the early stages of design, a building design method including this method, and a simplified BEI calculation system. [Means for solving the problem]
[0011] To solve the above problems, one aspect of the present invention provides a simplified method for calculating BEI, comprising the steps of: obtaining basic information of a building, wherein the basic information includes information on the thermal insulation performance of the building envelope used in the building, information on the energy-saving performance of equipment including air conditioning equipment, mechanical ventilation equipment, lighting equipment, and hot water supply equipment used in the building, information on the energy-saving performance of elevators used in the building, and information on the amount of energy reduction by energy efficiency equipment used in the building; setting simplified specifications for each floor of the building, which includes setting two or more of a plurality of physical rooms (7) having common uses as one virtual room (8); and calculating the BEI of the building based on the simplified specifications using a computer (3).
[0012] According to this embodiment, the BEI can be calculated based on simplified specifications derived from a virtual room, without the need to design a physical room in detail.
[0013] The step of setting the simplified specifications may include setting the virtual room (8) such that the floor area of the virtual room (8) is equal to the sum of the floor areas of the physical rooms corresponding to the virtual room, and the output of each piece of equipment in the virtual room is equal to the sum of the outputs of each piece of equipment in the physical rooms corresponding to the virtual room.
[0014] In this embodiment, while floor area and output have a significant impact on BEI, the floor area of the virtual room and the output of each piece of equipment are equal to the sum of the floor areas of the multiple physical rooms corresponding to this virtual room and the sum of the outputs of each piece of equipment. Therefore, the error of the simplified BEI compared to the regular BEI is reduced.
[0015] In the above embodiment, the step of setting the simplified specifications may include inputting the simplified specifications into the computer (3), and inputting the simplified specifications may include, for each of the facilities in each virtual room (8), selecting equipment that matches the energy-saving performance from the equipment displayed by the computer, and setting the number of selected equipment such that the product of the output per selected equipment and the number of equipment corresponds to the total output.
[0016] According to this embodiment, the input process for simplified specifications becomes easier.
[0017] In the above embodiment, the step of setting the simplified specifications may include, even if the physical rooms (7) have a common purpose, assigning the physical rooms facing the exterior wall and the physical rooms not facing the exterior wall to different virtual rooms (8) if such rooms exist.
[0018] According to this embodiment, since the heat transfer patterns differ between physical rooms facing the exterior walls of a building and physical rooms not facing the exterior walls, the accuracy of the calculated BEI is improved by distributing these to different virtual rooms.
[0019] In the above embodiment, the step of setting the simplified specifications includes creating a simplified floor plan of each floor of the building, wherein one or more of the multiple virtual rooms in the simplified floor plan are located at least partially different from the actual rooms that correspond to those virtual rooms.
[0020] According to this embodiment, errors in setting simplified specifications are suppressed by creating a simplified floor plan. Furthermore, the creation of a simplified floor plan becomes easier because the virtual room and the corresponding physical room may be located in different positions.
[0021] One aspect of the present invention is a BEI simple calculation system (1) used to implement the above simple calculation method, comprising an input device (2) for inputting the basic information obtained in the step of obtaining the basic information or the simplified specification obtained in the step of setting the simplified specification, a computer (3) for processing the information input from the input device, and an output device (4) for outputting the information processed by the computer.
[0022] According to this aspect, it is possible to provide a BEI simple calculation system capable of calculating BEI based on a simplified specification based on a virtual room without performing a specific design of a physical room.
[0023] One aspect of the present invention is a building design method, comprising a step of calculating the BEI by the above simple calculation method, a step of repeating the steps of setting the simplified specification until the BEI becomes less than or equal to a predetermined value when the BEI is greater than the predetermined value, and a step of calculating the BEI of the building based on the simplified specification, a step of designing the building based on the physical room (7), and a step of calculating the BEI based on the specification of the physical room and determining whether the building meets the energy conservation standard.
[0024] According to this aspect, since the BEI is initially calculated by a simple calculation method and finally calculated by a regular method, it is possible to design a building having a desired energy conservation performance while shortening the building design period.
Effects of the Invention
[0025] According to the above aspects, it is possible to provide a simple calculation method of BEI that can be calculated in the initial stage of design, a building design method including the method, and a BEI simple calculation system.
Brief Description of the Drawings
[0026] [Figure 1] Block diagram of the system according to the embodiment [Figure 2] Flowchart of the method according to the embodiment [Figure 3] Example of a questionnaire used in the method according to the embodiment [Figure 4] A simplified plan view used in the method described in the embodiment. [Figure 5] Examples of simplification in the method according to the embodiment [Figure 6] Example of specification input in the system according to the embodiment [Figure 7] Example of a calculation aid sheet in the method according to the embodiment [Figure 8] Example of output format of calculation results in the method according to the embodiment [Figure 9] Example of output format of calculation results in the method according to the embodiment [Figure 10] Examples of using the calculation results in the method according to the embodiment [Modes for carrying out the invention]
[0027] Embodiments of the present invention will be described below with reference to the drawings. Figure 1 is a block diagram of a simplified BEI calculation system 1 according to an embodiment. The simplified BEI calculation system 1 comprises an input device 2, a computer 3 that receives information input from the input device 2 and performs calculations related to that information, and an output device 4 that outputs the calculation results of the computer 3.
[0028] Input device 2 is a device that accepts input operations from the user, and includes, for example, a keyboard, mouse, touch panel, and / or microphone.
[0029] Computer 3 includes a processor 5 composed of a CPU (Central Processing Unit), etc., and a storage device 6 including RAM (Random Access Memory), ROM (Read-Only Memory), SSD (Solid State Drive), and / or HDD (Hard Disk Drive).
[0030] Output device 4 is a device that enables the user to recognize the output results of computer 3 visually or aurally, and includes a display, touch panel, speaker, and / or printer.
[0031] Figure 2 is a flowchart illustrating a method for preparing a proposal to a building owner in a competition, etc., including a simplified method for calculating BEI according to the embodiment. Table 2 shows the working time and required time. [Table 2]
[0032] Users of the BEI Simplified Calculation System 1 obtain the project overview of the building to be designed (ST1) and conduct a questionnaire for the designer (ST2, see Figure 3) in order to obtain basic information about the building. The project overview includes the address of the building site, land area, floor area, and / or the structure of the building. The information entered in the questionnaire may also include information about product names and equipment suppliers.
[0033] The information to be filled out in the questionnaire includes information on the thermal insulation performance of the building envelope, information on the energy-saving performance of various equipment used in the building, information on the energy-saving performance of elevators used in the building, and information on the amount of energy saved by energy efficiency equipment used in the building.
[0034] The building envelope includes glass, exterior walls, and roof. Information regarding glass includes the number of layers (single pane, double pane, triple or more), whether it is eco-glass (glass coated with a special metal film on the surface), whether blinds are present, and the direction in which they are applied (e.g., applying eco-glass or blinds only to the south side). Information regarding exterior walls and roof includes information regarding the type and thickness of insulation material.
[0035] Various types of equipment include air conditioning equipment, mechanical ventilation equipment, lighting equipment, and hot water supply equipment. Information regarding the energy-saving performance of air conditioning equipment includes information such as whether the compressor is driven by an electric motor or a gas engine. The inventor discovered that the energy-saving performance and output of each piece of equipment greatly affect the design primary energy consumption, while, for example, the length and arrangement of ventilation equipment ducts do not have much effect on the design primary energy consumption. Therefore, in the questionnaire, information regarding the energy-saving performance of mechanical ventilation equipment may include the presence or absence of a total heat exchanger and the presence or absence of control, but it is not necessary to include specific design details such as duct length. Information regarding the energy-saving performance of lighting equipment includes the type of lighting fixture (fluorescent lamp fixture, HID fixture, incandescent lamp fixture, LED), the presence or absence of a motion sensor, and the presence or absence of schedule control. Information regarding the energy-saving performance of hot water supply equipment includes the type of heat source (electric, gas, heat pump water heater using carbon dioxide, etc.).
[0036] Information regarding the energy-saving performance of elevators includes the speed control method and whether or not regenerative power is reused.
[0037] The amount of energy saved by energy efficiency improvement equipment includes information on electricity supplied by solar power generation equipment, as well as electricity supplied by cogeneration equipment and the amount of heat that can be effectively utilized.
[0038] Next, the user creates a simplified specification sheet (ST3). As shown in Figures 4 and 5, when creating the simplified specification sheet, it is preferable for the user to create a simplified floor plan for each level. Creating the simplified specification sheet and floor plan involves setting up two or more of the multiple physical rooms 7 that have common uses on each level as one virtual room 8.
[0039] Figure 4 is a floor plan of the virtual room 8. For example, while there are actually separate changing rooms and toilets for men and women, in the simplified specifications and floor plan, they are shown as separate rooms. The arrangement of the virtual room 8 in the floor plan may differ from the actual arrangement. For example, while corridors actually face the entrances to each room, in the simplified floor plan, they may be shown in a different location as long as the floor area matches the actual corridor floor area. The ceiling height (CH, in mm), as well as the presence or absence of air conditioning (AC), mechanical ventilation (V), lighting (L), and hot water supply (HW) equipment, are indicated in the simplified specifications. These should also be indicated in each virtual room 8 in the simplified floor plan.
[0040] If there are multiple actual reception rooms on a single floor, the simplified specification sheet and floor plan may classify them into reception rooms facing an exterior wall and reception rooms not facing an exterior wall, and each may be treated as a single virtual room 8 (in Figure 4, the rooms labeled "reception room" are rooms where multiple reception rooms facing an exterior wall have been replaced by a single virtual room 8, and the rooms labeled "corridor reception area" are rooms where reception rooms not facing an exterior wall have been replaced by a single virtual room 8). Furthermore, for physical rooms 7 facing an exterior wall that are used for common purposes, the physical room 7 facing the south exterior wall and the physical room 7 facing the north exterior wall may be assigned to different virtual rooms 8.
[0041] The simplified specification sheet is created so that the floor area of virtual room 8 and the output of various equipment (power consumption and fuel consumption) are equal to the sum of the floor areas and the sum of the output of various equipment of the multiple physical rooms 7 corresponding to virtual room 8. The simplified floor plan may be created using graph paper or similar.
[0042] As shown in Figure 5(A), even if rooms have different names, such as reception rooms and conference rooms, if they have a common purpose, they can be considered to have a common purpose and treated as one virtual room 8. In physical rooms 7, adjacent reception rooms and conference rooms can be treated as one virtual room 8 by ignoring the wall between them. In this case, the energy-saving performance of the air conditioning equipment in virtual room 8 is selected to be equivalent to that of the air conditioning equipment in physical room 7, and the total output of the air conditioning equipment in virtual room 8 matches the total output of the air conditioning equipment in physical room 7. However, the output of each air conditioning unit in virtual room 8 is selected from the outputs registered in computer 3 and does not necessarily have to match the output of each air conditioning unit in physical room 7.
[0043] As shown in Figure 5(B), for the lighting equipment in each virtual room 8, the type of lighting equipment (LED, fluorescent lamp, etc.) and the total output are set to match the type of lighting equipment and the total output of the corresponding physical room 7. The number of lighting equipment and the individual outputs are selected from the outputs registered in computer 3 and do not necessarily have to match the number of lighting equipment and the individual outputs of the corresponding physical room 7.
[0044] The same applies to equipment other than air conditioning and lighting systems. Therefore, the application for calculating BEI only needs to have a standard device registered for each piece of equipment according to its energy-saving performance; it is not necessary to register all commercially available equipment.
[0045] Next, as shown in Figure 2, the user inputs the contents of the simplified specification sheet into the computer 3 (see Figure 1) using the input device 2 (ST4). A commercially available application for calculating the BEI is installed on the computer 3 or on a server that can communicate with the computer 3. Based on the simplified specification sheet, the user selects the equipment and inputs the number of units.
[0046] For example, as shown in Figure 6(A), one standard specification and two high-efficiency specification outdoor units for air conditioning equipment are registered in the application. The user selects the outdoor unit from these based on a simplified specification table and enters the number of units. Similarly, as shown in Figure 6(B), standard equipment for indoor units of air conditioning equipment is also registered in the application, and the user selects the corresponding equipment from these based on a simplified specification table and enters the number of units. Furthermore, as shown in Figure 6(C), for lighting equipment, the lighting load per unit area for illuminances of 200lx, 500lx, and 700lx are registered in the application, and the user selects the corresponding equipment from these based on a simplified specification table and enters the number of units. Figure 7 shows an example of a simplified specification table (energy saving calculation basic information sheet).
[0047] Computer 3 calculates the BEI based on the input data. The application is preferably configured to output the BEI not only as a numerical value but also as a graph, as shown in Figure 8. In the figure, AC, V, L, HW, EV, CG, and SP represent air conditioning equipment, mechanical ventilation equipment, lighting equipment, hot water supply equipment, elevators, cogeneration equipment, and solar power generation equipment.
[0048] Next, as shown in Figure 2, the user or computer 3 (see Figure 1) determines whether the BEI calculated based on the simplified specification sheet is less than or equal to the target value (ST5). If the BEI is greater than the target value (ST5 No.), the user reviews the use of the building (ST6), and redoes the creation of the simplified specification sheet (ST3) and inputting the contents of the simplified specification sheet into computer 3 (ST4).
[0049] If the BEI is below the target value (Yes in ST5), the user has the BEI simplified calculation system 1 (see Figure 1) output an energy-saving summary table (Figure 9) which includes the specifications of the standard building, the specifications of the building to be calculated for BEI, and a comparison table comparing their energy consumption. The user also creates a proposal to the building owner, which includes a graph as shown in Figure 10 (ST10).
[0050] Once a contract for the design and construction of a building is awarded, the designer performs detailed design work. Based on the detailed design, the user requests a specialist to calculate the Building Energy Index (BEI) using the standard calculation method and confirms that the BEI calculated using the standard method is below the target value. After the contract is awarded, design changes are often made based on the client's requests, etc., but even if such common design changes occur, a recalculation using a simplified calculation method can be performed early, allowing for flexible responses. The difference between the BEI calculated based on the simplified specification sheet and the standard BEI calculated after detailed design is expected to be 5% or less.
[0051] For verification purposes, a simplified specification sheet was created for a pre-designed building for which a standard BEI had been calculated, corresponding to the detailed post-design specifications. When the BEI was calculated based on this simplified specification sheet, the difference between the two BEIs was approximately 2%. Therefore, in the planning stage, where design changes are expected to occur later, the BEI calculated based on the aforementioned simplified specification sheet can be considered a sufficiently reliable value.
[0052] The effects and benefits of the simplified BEI calculation method according to this embodiment will be explained. Since the number of days required to calculate the BEI during the planning stage is significantly reduced compared to conventional methods, the creation of proposal materials and cost calculation can be advanced more efficiently.
[0053] By setting up virtual room 8, the number of rooms that need to be configured is reduced, making it easier to create the specification sheet.
[0054] For each piece of equipment in virtual room 8 and the corresponding physical room 7, if their energy-saving performance is equivalent, then the sum of their outputs must be equal, thus reducing the number of devices that need to be registered in the application. Designers only need to set the number of devices in the simplified specification sheet according to the equipment registered in the application, making it easier to create a simplified specification sheet.
[0055] Even for physical rooms 7 used for common purposes, the heat transfer characteristics differ significantly depending on whether or not they face an exterior wall. Therefore, even for physical rooms 7 used for common purposes, the accuracy of the calculated BEI is improved by assigning physical rooms 7 facing an exterior wall and physical rooms 7 not facing an exterior wall to different virtual rooms 8.
[0056] Creating a simplified floor plan helps to reduce errors in setting specifications. Furthermore, allowing the arrangement of virtual room 8 in the simplified floor plan to differ from the arrangement of actual room 7 makes the creation of the simplified floor plan easier.
[0057] During the planning stage, the BEI is calculated using a simplified method to confirm whether the building conforms to energy conservation standards. Subsequently, the BEI is calculated using a standard method based on the final design of the actual room 7 to confirm whether the building conforms to energy conservation standards. This allows for the design of a building that conforms to energy conservation standards or has the desired energy-saving performance, while shortening the design period for the building.
[0058] Since the BEI (Building Energy Intake) is calculated in the early stages of design, incorporating proposals based on the calculation results into the design minimizes rework, and concrete energy-saving effects can be shown to the client numerically during the planning stage.
[0059] This concludes the description of specific embodiments. However, the present invention is not limited to the above embodiments or modifications and can be broadly modified and implemented. For example, a user may input questionnaire results into a computer, and the computer may create a simplified specification sheet and floor plan. [Explanation of Symbols]
[0060] 1: BEI simplified calculation system 2: Input device 3: Computer 4: Output device 5: Processor 6:Storage device 7: The physical room 8: Virtual Room
Claims
1. A simplified method for calculating BEI, A step of obtaining basic information of a building, wherein the basic information includes information on the thermal insulation performance of the building envelope used in the building, information on the energy-saving performance of equipment including air conditioning equipment, mechanical ventilation equipment, lighting equipment, and hot water supply equipment used in the building, information on the energy-saving performance of elevators used in the building, and information on the amount of energy saved by energy efficiency equipment used in the building. A step of setting simplified specifications for each floor of the aforementioned building, which includes setting two or more of a plurality of physical rooms having a common purpose as a single virtual room, A step of using a computer to calculate the BEI of the building based on the basic information and the simplified specifications, A simplified calculation method comprising the following features.
2. The simplified calculation method according to claim 1, wherein the step of setting the simplified specifications includes setting the virtual room such that the floor area of the virtual room is equal to the total floor area of the physical room corresponding to the virtual room, and the output of each piece of equipment in the virtual room is equal to the total output of each piece of equipment in the physical room corresponding to the virtual room.
3. The step of setting the simplified specifications includes inputting the simplified specifications into the computer, The simplified calculation method according to claim 2, wherein inputting the simplified specifications includes, for each of the facilities in each virtual room, selecting equipment from the equipment displayed by the computer that has the same energy-saving performance, and setting the number of selected equipment such that the product of the output per selected equipment and the number of equipment corresponds to the total output.
4. The simplified calculation method according to claim 2, wherein the step of setting the simplified specifications includes, even if the physical rooms have a common purpose, if there are physical rooms that face the exterior wall of the building and physical rooms that do not face the exterior wall, assigning the physical rooms that face the exterior wall and the physical rooms that do not face the exterior wall to different virtual rooms.
5. The step of setting the simplified specifications includes creating simplified floor plans for each floor of the building, The simplified calculation method according to claim 2, wherein one or more of the multiple virtual rooms in the simplified floor plan are located at a different position from the actual room corresponding to that virtual room, at least partially.
6. A simplified BEI calculation system used to carry out the simplified calculation method described in claim 1, An input device for inputting the basic information obtained in the step of obtaining the basic information and the simplified specifications obtained in the step of setting the simplified specifications, A computer that calculates the BEI of the building based on the basic information and simplified specifications input from the input device, An output device that outputs information processed by the aforementioned computer, A simplified BEI calculation system equipped with the necessary features.
7. A method for designing buildings, A step of calculating the BEI by the simplified calculation method described in claim 1, If the BEI is greater than a predetermined value, the steps of setting the simplified specifications and calculating the BEI of the building based on the simplified specifications are repeated until the BEI is less than or equal to the predetermined value. The steps include designing the building based on the aforementioned physical room, The steps include: calculating the BEI based on the specifications of the actual room and determining whether the building conforms to the energy conservation standards; A design method that includes the following features.