Housing design methods, manufacturing methods, design systems, and computer programs

Abstract

To provide a method for designing a house that can improve an own-house power consumption quantity.SOLUTION: There is provided a method of designing a house equipped with a solar power generation device. This designing method includes: a first step S1 of inputting a first design factor required for calculating energy consumption performance; a second step S2 of calculating the energy consumption performance based on the first design factor; a third step S3 of inputting a second design factor for improving an own-house power consumption quantity; a fourth step S4 of adding the selected second design factor to calculate an updated own-house power consumption quantity obtained by improving the own-house power consumption quantity; a fifth step S5 of calculating income and expenditure information based on the updated own-house power consumption quantity; and a sixth step S6 of outputting the income and expenditure information.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present invention relates to a housing design method and the like.

Background Art

[0002] Conventionally, energy-saving houses incorporating renewable energy such as sunlight have been proposed. In such houses, surplus power obtained by subtracting the self-consumption power consumed within the house from the power generated by a solar power generation device can be sold to an electric power company, enabling income to be obtained. Patent Document 1 below describes a control method for an information terminal device for displaying information related to power selling and power buying.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In recent years, with the decline in the selling price of electricity, it has become difficult to obtain sufficient income from selling electricity. Therefore, it is important to improve the amount of self-consumption power and reduce the expenditure on power purchase.

[0005] The present invention has been devised in view of the above actual situation, and its main object is to provide a method for designing a house capable of improving the amount of self-consumption power.

Means for Solving the Problems

[0006] The present invention relates to a method for designing a house having a solar power generation system, comprising: a first step of inputting into a computer a first design factor necessary for calculating the energy consumption performance of the house, including the amount of electricity used, the amount of solar power generated, and the amount of self-consumption of electricity used by the house, from among the design factors of the house; a second step of the computer calculating the energy consumption performance based on the first design factor; a third step of selecting at least one second design factor from a plurality of predetermined second design factors for improving the amount of self-consumption of electricity used and inputting it into the computer; a fourth step of the computer calculating an updated amount of self-consumption of electricity used by adding the selected second design factor to the amount of self-consumption of electricity used; a fifth step of the computer calculating balance information for a predetermined period based on the amount of electricity used and the amount of solar power generated, which are specified from the calculated energy consumption performance, and the updated amount of self-consumption of electricity used; and a sixth step of the computer outputting the balance information.

[0007] In the housing design method according to the present invention, if the income and expenditure information does not satisfy predetermined criteria, the method may include a step of changing the selected second design factor and repeating at least the fourth, fifth, and sixth steps.

[0008] In the housing design method according to the present invention, if the income and expenditure information does not satisfy predetermined standards, the method may include a step of changing the first design factor and repeating at least the second, fifth, and sixth steps.

[0009] In the housing design method according to the present invention, the plurality of second design factors may include a whole-house air conditioning system, a storage battery, V2H (Vehicle to Home) equipment, and a daytime water heating system.

[0010] In the housing design method according to the present invention, the housing may be a ZEH (Zero Energy House).

[0011] The present invention is a method for manufacturing a house, characterized by comprising the step of manufacturing the house based on the first design factor and the second design factor specified by any of the above-described house design methods.

[0012] The present invention relates to a design system for a house having a solar power generation device, and is characterized by including: a first design factor storage unit for inputting a first design factor necessary for calculating energy consumption performance, which includes the amount of electricity used, the amount of solar power generated, and the amount of self-consumption of electricity of the house among the design factors of the house; a consumption performance calculation unit for calculating the energy consumption performance based on the first design factor; a second design factor storage unit for inputting a second design factor, which is selected from a plurality of predetermined second design factors for improving the amount of self-consumption of electricity; an updated electricity amount calculation unit for calculating an updated amount of self-consumption of electricity with the selected second design factor added to improve the amount of self-consumption of electricity; a balance information calculation unit for calculating balance information for a predetermined period based on the amount of electricity used and the amount of solar power generated, which are specified from the calculated energy consumption performance, and the updated amount of self-consumption of electricity; and an output unit for outputting the balance information.

[0013] The present invention relates to a computer program for designing a house having a solar power generation system, characterized in that the computer functions as follows: a means for inputting a first design factor necessary for calculating the energy consumption performance of the house, which includes the amount of electricity used, the amount of solar power generated, and the amount of self-consumption of electricity of the house; a means for calculating the energy consumption performance based on the first design factor; a means for inputting a second design factor, in which at least one of a predetermined plurality of second design factors for improving the amount of self-consumption of electricity is selected; a means for calculating an updated amount of self-consumption of electricity with the selected second design factor added to improve the amount of self-consumption of electricity; a means for calculating balance information for a predetermined period based on the amount of electricity used and the amount of solar power generated, which are specified from the calculated energy consumption performance, and the updated amount of self-consumption of electricity; and a means for outputting the balance information. [Effects of the Invention]

[0014] By adopting the above-described steps, the housing design method of the present invention makes it possible to design a house that can improve its self-consumption of electricity. [Brief explanation of the drawing]

[0015] [Figure 1] This is a cross-sectional view showing a house designed using a specific residential design method. [Figure 2] This is a block diagram showing computers (house design systems) used in the design of houses. [Figure 3] This is a flowchart showing the processing steps for the design method (manufacturing method) of a house. [Figure 4] This figure shows the energy consumption performance calculated based on the first design factor. [Figure 5] This figure shows the screen displaying the options for the second design factor. [Figure 6] This figure shows the balance sheet information calculated based on the updated amount of electricity consumed by the self-consumption facility. [Figure 7] This graph shows monthly electricity consumption, solar power generation, and self-consumption of electricity. [Figure 8] This chart shows the correction factors for electricity consumption, solar power generation, and replacement self-consumption of electricity on a monthly basis. [Modes for carrying out the invention]

[0016] Embodiments of the present invention will be described below with reference to the drawings. It should be understood that the drawings contain exaggerations and representations that differ from the actual dimensional ratios of the structures in order to aid in understanding the content of the invention. Furthermore, the same or common elements are denoted by the same reference numerals throughout each embodiment, and redundant explanations are omitted. Moreover, the specific configurations shown in the embodiments and drawings are for the purpose of understanding the content of the present invention, and the present invention is not limited to the specific configurations shown in the drawings.

[0017] [Housing] In the housing design method of this embodiment (hereinafter sometimes simply referred to as the "design method"), a house having a solar power generation device is designed. The house of this embodiment is a commissioned house in which design factors (specifications) are determined based on the requests of the client. Note that the house is not limited to a commissioned house, and may be, for example, a house for sale or the like. FIG. 1 is a cross-sectional view showing a house 1 designed by the housing design method.

[0018] In this embodiment, for example, a house 1 that meets the energy conservation standards set by the Ministry of Land, Infrastructure, Transport and Tourism is designed. Examples of the energy conservation standards include the FY2016 Energy Conservation Standards (Grade 4 standards based on the Act on Promotion of Quality Assurance of Housing, etc.), the FY2018 Energy Conservation Standards (ZEH standards), and the Housing Business Building Owner Standards (Top Runner Standards). In this embodiment, a ZEH house (that is, a house that meets the ZEH standards) is designed. Note that the house is not limited to the house 1 that meets these energy conservation standards, and for example, a house (not shown) that meets other energy conservation standards may be designed.

[0019] In order to design an energy-saving house as described above, it is necessary to know the energy consumption performance (for example, the primary energy consumption) of the house 1. For the calculation of the primary energy consumption, for example, Non-Patent Document 1 (National Institute of Advanced Industrial Science and Technology, "Energy Consumption Performance Calculation Program (Residential Version)", [online], [searched on March 18, 2022], Internet <URL:http: / / house.app.lowenergy.jp / >) can be used.

[0020] In the above program, it is necessary to input information (hereinafter sometimes simply referred to as the "first design factor") necessary for the calculation of the energy consumption performance among the design factors (specifications) of the house 1. The first design factor 21 of this embodiment includes information regarding the facilities 2 of the house 1, the outer skin 3 of the house 1, the floor plan of the house 1, and the region where the house 1 is planned to be constructed. <​​Equipment 2 is a device installed in the house 1. Equipment 2 in this embodiment includes, for example, an air conditioner 4, a ventilation system 5, a water heater 6, a lighting system 7, and a solar power generation system 8. The water heater 6 in this embodiment is configured as a night-time water heater that heats water using off-peak electricity.

[0022] The building envelope 3 consists of the exterior walls 3a, floor 3b, ceiling 3c, roof 3d, windows 3e, and foundation 3f, which form the thermal boundary. The floor plan includes the arrangement of the living rooms 9 and their floor areas, etc.

[0023] Details of the first design factor 21 can be found in Non-Patent Document 1 and Non-Patent Document 2 (National Institute for Land and Infrastructure Management, "Technical Information on the Evaluation of Energy Consumption Performance in accordance with the 2016 Energy Conservation Standards (Housing)", [online], [Accessed March 18, 2022], Internet).<URL:https: / / www.kenken.go.jp / becc / house.html> ) and so on. Furthermore, the first design factor 21 corresponds to, for example, the first design information and the second design information described in the patent document (Japanese Patent Publication No. 6997699).

[0024] The program described in Non-Patent Document 1 above can calculate energy consumption performance when the first design factors 21 of the above-mentioned house 1 (information regarding equipment 2, building envelope 3, floor plan, and the area where construction is planned) are input. This energy consumption performance includes the electricity consumption, solar power generation, and self-consumption of electricity of house 1.

[0025] Incidentally, in a house like the one described above (energy-efficient house) 1, the surplus electricity generated by the solar power generation system 8, after deducting the electricity consumed within the house 1, can be sold to the power company, thus generating income. However, in recent years, with the decline in electricity selling prices, it has become difficult to earn sufficient income from selling electricity. Therefore, it is important to increase the amount of electricity consumed by the homeowner to reduce expenses related to purchased electricity.

[0026] [House design methods and housing manufacturing methods] In the design method of this embodiment, a house 1 capable of improving its self-consumption is designed. Furthermore, in the manufacturing method of the house of this embodiment (hereinafter simply referred to as the "manufacturing method"), the house 1 is manufactured based on the design factors of the house 1 (first design factor 21 and the second design factor described later) specified in the design method. A computer is used in the design method of this embodiment. Figure 2 is a block diagram showing the computer 10 (house design system 11) used in the house design method.

[0027] [Housing design system] The computer 10 in this embodiment is configured as a housing design system (hereinafter sometimes simply referred to as the "design system") 11. The design system 11 (computer 10) in this embodiment may include, for example, a personal computer, a portable information terminal (such as a tablet), and a cloud server connected via the Internet.

[0028] The design system 11 of this embodiment includes an input device 12 as an input device, an output device 13 as an output device, and a calculation processing unit 14 for designing a house.

[0029] The input device 12 may be, for example, a keyboard, mouse, or touch panel. The output device 13 may be, for example, a display device or printer. The arithmetic processing unit 14 includes an arithmetic unit (CPU) 16 that performs various calculations, a storage unit 17 that stores data and programs, and a working memory 18.

[0030] The storage unit 17 is a non-volatile information storage device, such as a magnetic disk, optical disk, or SSD. The storage unit 17 is provided with a data unit 19 and a program unit 20.

[0031] The data unit 19 of this embodiment is for storing information necessary for designing a custom-built house. The data unit 19 of this embodiment includes a first design factor storage unit 19A, a second design factor storage unit 19B, a power consumption performance storage unit 19C, an updated power consumption storage unit 19D, and a revenue and expenditure information storage unit 19E.

[0032] The program unit 20 in this embodiment is a computer program necessary to cause the computer 10 to execute the design method. This program unit (computer program) 20 is executed by the calculation unit 16, thereby enabling the computer 10 to function as a specific means necessary for designing a house.

[0033] The program unit 20 of this embodiment includes a first design factor input unit 20A, a second design factor input unit 20B, a power consumption calculation unit 20C, an updated power consumption calculation unit 20D, a revenue and expenditure information calculation unit 20E, and a revenue and expenditure information output unit 20F. The functions of these program units 20 will be explained in each step of the design method described later.

[0034] [House design methods (house manufacturing methods)] Next, the design method of this embodiment will be described. Figure 3 is a flowchart showing the processing steps of the design method (manufacturing method of the house 1).

[0035] [Step 1 (Inputting the first design factor)] In the design method of this embodiment, first, the first design factor 21 (shown in Figure 1), which is necessary for calculating the energy consumption performance of the house 1, is input into the computer 10 (shown in Figure 2) (first step S1). In the first step S1 of this embodiment, the energy consumption performance calculated includes the amount of electricity used by the house 1, the amount of solar power generation, and the amount of electricity consumed by the house itself.

[0036] In the first step S1 of this embodiment, as shown in Figure 2, the first design factor input unit 20A is loaded into the working memory 18. Then, by executing the first design factor input unit 20A by the calculation unit 16, the computer 10 can be made to function as a means for inputting the first design factor 21 (shown in Figure 1).

[0037] In the first step S1 of this embodiment, first, based on the client's requests, etc., the first design factors 21 shown in Figure 1 (in this example, information regarding equipment 2, exterior envelope 3, floor plan, and the area where construction is planned) are determined. If the first design factors 21 have already been determined prior to the first step S1, those first design factors 21 will be used. Then, in the first step S1, the first design factors 21 are input into the computer 10 (first design factor storage unit 19A) shown in Figure 2.

[0038] [Step 2 (Calculating energy consumption performance)] Next, in the design method of this embodiment, the computer 10 (shown in Figure 2) calculates the energy consumption performance of the house 1 based on the first design factor 21 (second step S2). In the second step S2, as shown in Figure 2, the first design factor 21 input to the first design factor storage unit 19A and the energy consumption performance calculation unit 20C are loaded into the working memory 18. Then, the energy consumption performance calculation unit 20C is executed by the calculation unit 16, thereby enabling the computer 10 to function as a means for calculating energy consumption performance.

[0039] In the second step S2 of this embodiment, for example, the program described in Non-Patent Document 1 or the Energy Consumption Performance Calculation Program (Residential Version) API provided by the National Institute for Land and Infrastructure Management is used to calculate the energy consumption performance of the house 1. The first design factor 21 shown in Figure 1 (in this example, information on equipment 2, building envelope 3, floor plan, and the area where construction is planned) is input into this Energy Consumption Performance Calculation Program (Residential Version) API, and the energy consumption performance of the house 1 is calculated. The calculated energy consumption performance includes the electricity consumption, solar power generation, and self-consumption of the house 1. The energy consumption performance is input into the energy consumption performance storage unit 19C (computer 10) shown in Figure 2.

[0040] In the second step S2, the calculated energy consumption performance (electricity consumption of house 1, solar power generation amount, and self-consumption amount) may be output to, for example, the output device (display device, etc.) 13 shown in Figure 2. Figure 4 is a diagram showing the energy consumption performance 23 calculated based on the first design factor 21.

[0041] Figure 4 displays the energy consumption performance 23 calculated based on the first design factors 21 of the house 1 shown in Figure 1 (in this example, information on equipment 2, building envelope 3, floor plan, and the area where construction is planned). In this embodiment, the energy consumption performance 23 displays electricity usage 23A, solar power generation 23B, and self-consumption 23C. By outputting this energy consumption performance 23, the current energy consumption performance 23 of the house 1 (for example, self-consumption 23C, etc.) can be easily grasped by, for example, the homeowner.

[0042] In the second step S2, balance information 24 for a predetermined period may be displayed based on the amount of electricity used 23A, the amount of solar power generated 23B, and the amount of self-consumption 23C included in the energy consumption performance 23. Balance information 24 is calculated, for example, based on the following formula (1). Revenue and expenditure information = Initial installation costs + (Electricity purchase expenses - Electricity sales revenue - Expenses assuming that electricity for self-consumption was purchased) × Period ... (1)

[0043] The "initial installation cost" in formula (1) above is the cost required to install the solar power generation system 8 shown in Figure 1 (for example, including the price of the solar power generation system 8 itself and installation costs). This initial installation cost is output as, for example, the initial installation cost 25 in Figure 4.

[0044] In equation (1) above, "electricity purchase expenses" are the expenses incurred from purchasing electricity from the power company. These electricity purchase expenses are calculated by multiplying the amount of electricity purchased (26) in Figure 4 by the electricity purchase price (27). In equation (1) above, "electricity sales revenue" are the revenue that can be obtained by selling electricity to the power company. These electricity sales revenue are calculated by multiplying the amount of electricity sold (28) in Figure 4 by the electricity sales price (29).

[0045] The amount of electricity purchased 26 is calculated by subtracting the amount of electricity consumed by the user (23C) from the amount of electricity used 23A. On the other hand, the amount of electricity sold 28 is calculated by subtracting the amount of electricity consumed by the user (23C) from the amount of solar power generated 23B. Since these amounts of electricity used 23A, solar power generated 23B, and amount of electricity consumed by the user (23C) are calculated as energy consumption performance 23, the amount of electricity purchased 26 and the amount of electricity sold 28 can be easily calculated. The depreciation period 31 is calculated by dividing the initial installation cost 25 of the solar power generation equipment 8 by the sum of the amount of electricity sold 28 multiplied by the selling price 29 and the amount of electricity consumed by the user (23C) multiplied by the purchase price 27.

[0046] The electricity purchase price 27 and the electricity sales price 29 can be set as appropriate. In this embodiment, the electricity purchase price 27 and the electricity sales price 29 are set, for example, based on actual fluctuations in electricity purchase and sales prices, from the viewpoint of accurately obtaining future revenue and expenditure information.

[0047] The "period" in formula (1) above is set appropriately based on, for example, the income and expenditure information 24 to be acquired. In this embodiment, the period is set to 15 to 25 years (20 years in this example).

[0048] The expression "(expenses for purchasing electricity - revenue from selling electricity - expenses assuming that electricity for self-consumption was purchased) × period" in formula (1) above represents the amount that the residents of house 1 will actually pay to the power company over a predetermined period (20 years in this example). By adding the initial installation cost 25 of the solar power generation system 8 to this amount, the balance sheet information 24 (initial installation cost + electricity bill) that will occur over a predetermined period (20 years in this example) for house 1 shown in Figure 1 is calculated. The lower the amount of this balance sheet information 24, the greater the benefit of installing the solar power generation system 8. This balance sheet information 24 (before the introduction of the second design factor) is input into, for example, the balance sheet information storage unit 19E (computer 10) shown in Figure 2.

[0049] [Step 3 (Selecting the second design factor)] Next, in the design method of this embodiment, at least one second design factor is selected from a plurality of predetermined second design factors for improving the self-consumption power consumption 23C (shown in Figure 4) and input into the computer 10 (shown in Figure 2) (third step S3).

[0050] In the third step S3 of this embodiment, first, as shown in Figure 2, the energy consumption performance (self-consumption amount 23C shown in Figure 4) stored in the energy consumption performance storage unit 19C is loaded into the working memory 18. Furthermore, the second design factor input unit 20B (including a predetermined number of second design factors) is loaded into the working memory 18. Then, the second design factor input unit 20B is executed by the calculation unit 16, thereby enabling the computer 10 to function as a means for inputting the selected second design factors. Figure 5 is a diagram showing a screen displaying the selection of second design factors 22.

[0051] In the third step S3 of this embodiment, first, a plurality of second design factors 22 are displayed on the output unit (display device, etc.) 13 shown in Figure 2. The plurality of second design factors 22 can be determined as appropriate if they can improve the self-consumption power consumption 23C (shown in Figure 4). The plurality of second design factors 22 include a whole-house air conditioning system 22A, a storage battery 22B, V2H (Vehicle to Home) equipment 22C, and a daytime water heater 22D. Note that some of these plurality of second design factors 22 may be omitted, or other second design factors (not shown) may be included.

[0052] The whole-house air conditioning system 22A of this embodiment is for supplying air-conditioned by a single air conditioner to multiple spaces (in this example, living rooms 9). Since such a whole-house air conditioning system 22A operates the air conditioner 4 and fans (not shown) for supplying the conditioned air 24 hours a day, it can consume the electricity generated by the solar power generation device 8 (shown in Figure 1) during the daytime when it is generating power. Therefore, a house equipped with the whole-house air conditioning system 22A can improve its self-consumption of electricity 23C (shown in Figure 4) compared to a house 1 (shown in Figure 1) where each living room 9 is individually air-conditioned.

[0053] The battery 22B in this embodiment is for storing electricity generated by the solar power generation system 8 (shown in Figure 1). Such a battery can store the electricity generated by the solar power generation system 8 during the daytime, for example. Furthermore, the battery 22B can use the electricity stored during the day, for example, at night. Therefore, a house equipped with a battery can improve its self-consumption of electricity.

[0054] The V2H device 22C of this embodiment is for storing electricity in the battery of an electric vehicle or the like, and supplying that stored electricity to the house 1. Such a V2H device 22C can, for example, store the electricity generated by the solar power generation device 8 (shown in Figure 1) in the battery of an electric vehicle or the like during the daytime when the device is generating electricity. Furthermore, the V2H device 22C can, for example, supply the electricity stored in the battery of an electric vehicle or the like to the house 1 at night. Therefore, a house equipped with the V2H device 22C can improve its self-consumption of electricity.

[0055] The daytime water heater 22D of this embodiment is capable of heating (reheating) hot water during the daytime. Such a daytime water heater 22D can heat water using the electricity generated by the solar power generation device 8 (shown in Figure 1) during the daytime when it is generating electricity. Therefore, for example, a house that has installed the daytime water heater 22D instead of the nighttime water heater 6 (shown in Figure 1) can improve its self-consumption of electricity.

[0056] These multiple second design factors 22 (in this example, the whole-house air conditioning system 22A, the battery 22B, the V2H equipment 22C, and the daytime water heater 22D) are set, for example, in the second design factor input unit 20B (shown in Figure 2) prior to the execution of the third step S3.

[0057] In this embodiment, checkboxes are displayed that allow selection of each second design factor 22 (whole-house air conditioning system 22A, storage battery 22B, V2H equipment 22C, and daytime water heater 22D). These checkboxes are displayed on the output device 13 (shown in Figure 2), making it easy to select multiple second design factors 22.

[0058] Next, in the third step S3 of this embodiment, after at least one second design factor 22 is selected from among the multiple second design factors 22, the button (next) 31 is pressed. As a result, in the third step S3, the selected second design factor 22 is input into the second design factor storage unit 19B (computer 10) shown in Figure 2. If no second design factors 22 have been selected, it is preferable that a message prompting the selection of a second design factor 22 (not shown) is displayed.

[0059] [Step 4 (Calculating the amount of electricity consumed during the upgrade)] Next, in the design method of this embodiment, the computer 10 (shown in Figure 2) adds the selected second design factor 22 to calculate the updated self-consumption amount which improves the self-consumption amount 23C (shown in Figure 4) (fourth step S4).

[0060] In the fourth step S4 of this embodiment, first, as shown in Figure 2, the self-consumption amount 23C (shown in Figure 4) stored in the power consumption performance storage unit 19C and the second design factor 22 stored in the second design factor storage unit 19B are loaded into the working memory 18. Furthermore, the updated power consumption calculation unit 20D is loaded into the working memory 18. Then, the updated power consumption calculation unit 20D is executed by the calculation unit 16, thereby enabling the computer 10 to function as a means for calculating the updated self-consumption amount.

[0061] The replacement self-consumption power can be appropriately calculated based on the selected second design factor 22 (at least one of the whole-house air conditioning system 22A, storage battery 22B, V2H equipment 22C, and daytime water heater 22D shown in Figure 5). In this embodiment, the replacement self-consumption power is determined based on the following formula (2). Updated private power consumption = private power consumption x improvement magnification…(2)

[0062] In equation (2) above, the "self-consumption amount" is substituted with the self-consumption amount 23C shown in Figure 4. The "improvement multiplier" in equation (2) above represents the multiplier by which the self-consumption amount 23C improves when the selected second design factor 22 is added to (introduced to) the house 1. Such an improvement multiplier can be appropriately set, for example, by the specifications of the second design factor 22.

[0063] The performance multiplier for the whole-house air conditioning system 22A is set to, for example, 1.08 to 1.15 times (1.12 times in this example). The performance multiplier for the battery storage system 22B is set to, for example, 1.15 to 1.35 times (1.25 times in this example). The performance multiplier for the V2H equipment 22C is set to, for example, 1.25 to 1.35 times (1.30 times in this example). The performance multiplier for the daytime water heater 22D is set to, for example, 1.08 to 1.45 times (1.20 times in this example).

[0064] For example, if a daytime water heater 22D is selected as the second design factor 22, the self-consumption energy consumption 23C shown in Figure 4 (3,693 kWh / year in this example) is multiplied by the improvement multiplier (1.20 times in this example) based on the above formula (2). This calculates the replacement self-consumption energy consumption (4,431.6 kWh / year in this example).

[0065] If multiple second design factors 22 are selected in the third step S3, the increase multipliers of the selected second design factors 22 are added together, then the total number of selected second design factors 22 is subtracted, and then 1 is added to obtain the improvement multiplier. The calculated updated self-consumption power is input to the updated power storage unit 19D (computer 10) shown in Figure 2.

[0066] [Step 5 (Calculating Income and Expenditure Information)] Next, in the design method of this embodiment, the computer 10 (shown in Figure 2) calculates balance information for a predetermined period (5th step S5). This balance information is calculated based on the amount of electricity used 23A and the amount of solar power generated 23B (shown in Figure 4) identified from the calculated energy consumption performance 23, and the amount of electricity consumed by the replacement self-consumption system.

[0067] In the fifth step S5 of this embodiment, first, as shown in Figure 2, the updated self-consumption amount stored in the updated power amount storage unit 19D and the energy consumption performance 23 stored in the consumption performance storage unit 19C are loaded into the working memory 18. Furthermore, the balance information calculation unit 20E is loaded into the working memory 18. Then, the balance information calculation unit 20E is executed by the calculation unit 16, thereby enabling the computer 10 to function as a means for calculating balance information. Figure 6 is a diagram showing the balance information 24 calculated based on the updated self-consumption amount 33. Figure 6 also shows the balance information 24 before the introduction of the second design factor 22 (shown in Figure 4).

[0068] In the fifth step S5 of this embodiment, first, the balance sheet information 24 for a predetermined period is calculated based on the updated self-consumption amount 33. The balance sheet information 24 is calculated based on the above formula (1). In this embodiment, the initial installation cost 25, the electricity purchase price 27, the electricity sales price 29, and the predetermined period are set to the above values ​​(the same values ​​as in the second step S2).

[0069] In the fifth step S5 of this embodiment, the amount of electricity purchased 26 (in this example, 7,689.4 kWh / year) is obtained by subtracting the updated self-consumption amount 33 (in this example, 4431.6 kWh / year) from the power consumption amount 23A (in this example, 12,121 kWh / year) in Figure 6. Also in the fifth step S5, the amount of electricity sold 28 (in this example, 7,746.4 kWh / year) is obtained by subtracting the updated self-consumption amount 33 (in this example, 4431.6 kWh / year) from the solar power generation amount 23B (in this example, 12,178 kWh / year) in Figure 6. Since the updated self-consumption amount 33 has improved compared to the self-consumption amount 23C before the introduction of the second design factor 22, the amount of electricity purchased 26 and the amount of electricity sold 28 have both decreased.

[0070] In the fifth step S5 of this embodiment, the electricity purchase expenditure (electricity purchase amount 26 × electricity purchase price 27) obtained from the electricity purchase amount 26, and the electricity sales revenue (electricity sales amount 28 × electricity sales price 29) obtained from the electricity sales amount 28 are calculated. Then, by substituting the electricity purchase expenditure, electricity sales expenditure, initial installation cost, and period into the above formula (1), the balance sheet information 24 based on the updated self-consumption amount 33 (in this example, 5,234,996 yen) is calculated.

[0071] In this embodiment, although the amount of electricity sold 28 decreases due to the improvement in the updated self-consumption amount 33, the amount of electricity purchased 26, which has a high electricity purchase price 27, can be reduced. As a result, the electricity expenditure of the house 1 in which the second design factor 22 is introduced can be made smaller than that of the house 1 in which the second design factor 22 is not introduced, and the amount of the income and expenditure information 24 (and amortization period 31) can be reduced. This income and expenditure information 24, etc., is stored in the income and expenditure information storage unit 19E (computer 10) shown in Figure 2.

[0072] [Step 6 (Outputting Income and Expense Information)] Next, in the design method of this embodiment, the computer 10 (shown in Figure 2) outputs the income and expenditure information 24 (sixth step S6). In the sixth step S6 of this embodiment, first, as shown in Figure 2, the income and expenditure information 24 (shown in Figure 6) stored in the income and expenditure information storage unit 19E and the income and expenditure information output unit 20F are loaded into the working memory 18. Then, the income and expenditure information output unit 20F is executed by the calculation unit 16, thereby enabling the computer 10 to function as a means for outputting the income and expenditure information 24.

[0073] In the sixth step S6 of this embodiment, as shown in Figure 6, the revenue and expenditure information (revenue and expenditure information after the introduction of the second design) 24 calculated based on the updated self-consumption energy consumption 33, etc., is output to the output device (display device, etc.) 13 shown in Figure 2. Furthermore, in this embodiment, the updated self-consumption energy consumption 33 is also output. As a result, in the design method (design system 11) of this embodiment, the amount of the updated self-consumption energy consumption 33 which has improved due to the introduction of the selected second design factor 22, and the amount of the revenue and expenditure information 24 which has decreased due to the improvement in the updated self-consumption energy consumption 33, can be easily grasped by the client, etc.

[0074] In this embodiment, the amount of electricity used 23A and the amount of solar power generated 23B, which are determined from the energy consumption performance 23, may be output. Furthermore, the purchase price 27, the sale price 29, the amount of electricity purchased 26, the amount of electricity sold 28, and a predetermined period may also be output. This makes it possible for the design method (design system 11 (computer program)) of this embodiment to show the calculation conditions of the income and expenditure information 24 to the client, etc.

[0075] Thus, in the design method (design system 11 (computer program)) of this embodiment, the above-mentioned revenue and expenditure information 24 is output, making it easy to evaluate the improved updated self-consumption energy consumption 33 that is achieved by introducing the selected second design factor 22. Therefore, the design method (design system 11) of this embodiment makes it possible to design a house (in this example, a ZEH house) 1 having a second design factor 22 that can improve the self-consumption energy consumption 23C.

[0076] Furthermore, the design method (design system 11 (computer program)) of this embodiment allows for easy evaluation of the reduced electricity expenditure (amount of electricity purchased 26), the amortization period 31, and the balance sheet information 24 resulting from the updated self-consumption 33. Therefore, the design method (design system 11) of this embodiment makes it possible to design a house (ZEH house) 1 that offers significant cost benefits to the homeowner.

[0077] In the sixth step S6 of this embodiment, the financial information 24 for the ZEH house is output, but for example, financial information (not shown) for a house 1 that meets other energy conservation standards may also be output. This makes it possible to compare the financial information 24 for multiple energy conservation standards.

[0078] In the sixth step S6 of this embodiment, the power consumption 23A, the solar power generation 23B, and the replacement self-consumption 33 may be output on a monthly basis. Figure 7 is a graph showing the power consumption 23A, the solar power generation 23B, and the replacement self-consumption 33 on a monthly basis.

[0079] In this embodiment, the graph shown in Figure 7 can show the relationship between the amount of electricity used 23A and the amount of solar power generated 23B, which fluctuate depending on the season (such as outside temperature), and the updated self-consumption of electricity 33 on a monthly basis. Such a graph makes it possible to easily evaluate the updated self-consumption of electricity 33 that has been improved by the selected second design factor 22.

[0080] In the sixth step S6 of this embodiment, correction coefficients for the monthly electricity consumption 23A, solar power generation 23B, and self-consumption 23C are used to create the graph. Figure 8 shows the correction coefficients 35 for electricity consumption 23A, solar power generation 23B, and updated self-consumption 33 on a monthly basis.

[0081] The correction coefficient 35 in this embodiment is the ratio of electricity usage 23A, solar power generation 23B, and replacement self-consumption 33 for each month, with the electricity usage 23A, solar power generation 23B, and replacement self-consumption 33 for a predetermined month (April in this example) set to 1.0. The correction coefficient 35 includes the correction coefficient 35A for electricity usage, the correction coefficient 35B for solar power generation, and the correction coefficient 35C for replacement self-consumption.

[0082] Each correction coefficient 35A to 35C is useful for understanding the monthly increase or decrease (ratio) of electricity consumption 23A, solar power generation 23B, and replacement self-consumption 33. Furthermore, by multiplying each month's correction coefficient 35A to 35C by the electricity consumption 23A, solar power generation 23B, and replacement self-consumption 33 of a predetermined month (April), the electricity consumption 23A, solar power generation 23B, and replacement self-consumption 33 of other months can be easily determined.

[0083] Each correction factor 35A to 35C can be determined as appropriate. The correction factor 35A for electricity consumption and the correction factor 35C for updated self-consumption can be determined, for example, based on measurements using an actual house 1 or simulations. On the other hand, the correction factor 35B for solar power generation can be determined, for example, from Non-Patent Literature 3 (Ministry of the Environment, "Understanding Household Energy Situation in FY2017", [online], [Accessed March 18, 2022], Internet).<URL:http: / / www.env.go.jp / earth / ondanka / kateico2tokei / 2017 / result3 / detail3 / index.html> This is calculated based on Figure 3, "Monthly power generation and sales of solar power generation systems (per household) (FY2017)," shown in [the relevant document].

[0084] [Process for evaluating income and expenditure information] Next, in the design method of this embodiment, it is determined whether the income and expenditure information 24 satisfies predetermined criteria (step S7). In step S7 of this embodiment, if the amount of the income and expenditure information 24 is less than a predetermined threshold (amount), it is determined that the income and expenditure information satisfies the criteria. Such a determination may be made by the computer 10 (design system 11) or by the client, etc. The threshold (criteria) is set appropriately according to the energy-saving performance required for the house (in this example, a ZEH house) 1, for example.

[0085] In process S7, if the revenue and expenditure information 24 satisfies the criteria ("Yes" in process S7), the next process S8 is performed. On the other hand, if the revenue and expenditure information 24 does not satisfy the criteria ("No" in process S7), the selected second design factor 22 is changed (process S9), and at least the fourth process S4, the fifth process S5, and the sixth process S6 are performed again.

[0086] In step S9 of this embodiment, the previously selected second design factor 22 and combinations of the second design factor 22 are excluded, and other second design factors or other combinations of the second design factor 22 are selected. As a result, the design method (design system 11 (computer program)) of this embodiment makes it possible to reliably design a house (in this example, a ZEH house) 1 that improves the amount of self-consumption of electricity and satisfies the criteria for the income and expenditure information 24.

[0087] [Manufacturing houses] Next, in the manufacturing method of this embodiment, the house 1 is manufactured based on the first design factor 21 (shown in Figure 1) and the second design factor 22 (shown in Figure 5) specified in the design method (step S8). As a result, the manufacturing method of this embodiment makes it possible to reliably manufacture a house (in this example, a ZEH house) 1 having a second design factor 22 that can improve the self-consumption energy consumption 23C (shown in Figure 6).

[0088] [Housing design method and housing manufacturing method (second embodiment)] In the design method of the previous embodiment, as shown in Figure 3, if the revenue and expenditure information 24 (shown in Figure 6) does not satisfy a predetermined criterion in step S7, the selected second design factor 22 is changed (step S9). However, the embodiment is not limited to this. For example, if the revenue and expenditure information 24 does not satisfy the criterion in step S7 ("No" in step S7), the first design factor 21 (shown in Figure 1) may be changed, and at least the second step S2, the fifth step S5, and the sixth step S6 may be performed again.

[0089] In the step of changing the first design factor in this embodiment (not shown), the specifications of the building envelope 3 (for example, the thermal insulation performance of the exterior wall 3a) of the first design factor 21 are changed so that the income and expenditure information 24 satisfies the standard. This makes it possible to improve the amount of electricity consumed by the homeowner through the second design factor 22 and reduce the amount of electricity purchased through the change in the first design factor 21, thereby enabling the reliable design and manufacture of a house (in this example, a ZEH house) 1 that satisfies the standard of income and expenditure information 24.

[0090] In this embodiment, as in previous embodiments, the step S9 of changing the selected second design factor 22 may be further performed. This makes it possible to design and manufacture a house (in this example, a ZEH house) 1 in which the financial information 24 meets the criteria more reliably.

[0091] Although particularly preferred embodiments of the present invention have been described in detail above, the present invention is not limited to the illustrated embodiments and can be implemented in various modified forms. [Explanation of symbols]

[0092] S1 1st process S2 2nd process S3 3rd process S4 4th process S5 5th process S6 6th process

Claims

1. A method for designing a house equipped with a solar power generation system, The first step involves inputting into a computer the first design factor, which is necessary for calculating the energy consumption performance of the house, including the amount of electricity used, solar power generation, and self-consumption of electricity, from among the design factors of the house. The computer performs a second step of calculating the energy consumption performance based on the first design factor, A third step involves selecting at least one second design factor from a predetermined set of second design factors that differ from the first design factor and improve the amount of self-consumption power consumption compared to the amount of self-consumption power consumption included in the energy consumption performance calculated in the second step, and inputting it into the computer. The computer performs a fourth step of calculating an updated self-consumption amount with improved self-consumption amount by adding the selected second design factor, A fifth step in which the computer calculates balance information for a predetermined period based on the amount of electricity used and the amount of solar power generated, which are determined from the calculated energy consumption performance, and the amount of self-consumption power used for the renewal, The computer performs a sixth step in which it outputs the income and expenditure information, The process includes, if the aforementioned financial information does not satisfy predetermined criteria, changing the selected second design factor and repeating at least the fourth, fifth, and sixth steps, House design methods.

2. The housing design method according to Claim 1, further comprising the step of changing the first design factor and repeating at least the second, fifth, and sixth steps if the income and expenditure information does not satisfy predetermined criteria.

3. The housing design method according to claim 1 or 2, wherein the plurality of second design factors include a whole-house air conditioning system, a storage battery, V2H (Vehicle to Home) equipment, and a daytime water heating system.

4. The method for designing a house according to any one of claims 1 to 3, wherein the house is a ZEH (Zero Energy House).

5. The fourth step is to calculate the updated self-consumption of electricity based on the following formula (2), the method for designing a house according to any one of claims 1 to 4. Updated private power consumption = private power consumption x improvement rate...(2)

6. A design system for a house having a solar power generation device, A first design factor storage unit for inputting a first design factor necessary for calculating the energy consumption performance of the house, including the amount of electricity used, solar power generation, and self-consumption of electricity, among the design factors of the house, A power consumption performance calculation unit calculates the energy consumption performance based on the first design factor, A second design factor storage unit for inputting a second design factor in which at least one of a predetermined set of second design factors is selected, which differs from the first design factor and is used to improve the amount of self-consumption power consumption compared to the amount of self-consumption power consumption included in the energy consumption performance calculated by the energy consumption performance calculation unit, An updated power consumption calculation unit calculates an updated self-consumption amount that improves the self-consumption amount by adding the selected second design factor, A balance information calculation unit calculates balance information for a predetermined period based on the amount of electricity used and the amount of solar power generation specified from the calculated energy consumption performance, and the amount of self-consumption of electricity used for the renewal. It includes a revenue and expenditure information output unit that outputs the aforementioned revenue and expenditure information, If the aforementioned balance information does not satisfy predetermined criteria, the selected second design factor is changed, and at least the updated power consumption calculation unit, the balance information calculation unit, and the balance information output unit are executed again. A residential design system.

7. A computer program for designing a house having a solar power generation system, Computers, A means for inputting a first design factor, which is necessary for calculating the energy consumption performance of the house, including the amount of electricity used, solar power generation, and self-consumption of electricity, among the design factors of the house; A means for calculating the energy consumption performance based on the first design factor, A means for inputting a second design factor, which differs from the first design factor and is selected from a plurality of predetermined second design factors that improve the amount of self-consumption power consumption compared to the amount of self-consumption power consumption included in the energy consumption performance calculated by the means for calculating the energy consumption performance, A means for calculating the updated self-consumption amount with improved self-consumption amount by adding the selected second design factor, A means for calculating balance information for a predetermined period based on the amount of electricity used and the amount of solar power generated, which are determined from the calculated energy consumption performance, and the amount of self-consumption of electricity used for renewal, This is configured to function as a means for outputting the aforementioned income and expenditure information. If the aforementioned financial information does not satisfy predetermined criteria, the selected second design factor is changed to allow the computer to function again as at least a means for calculating the updated self-consumption amount, a means for calculating the financial information for the period, and a means for outputting the financial information. Computer program.

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