Method, processing device, or program
By converting transmissive bodies into window and inner wall elements with defined properties, the method addresses the challenge of inaccurate heat load calculations in buildings with partitions, enabling precise simulation of heat loads through combined element modeling.
Patent Information
- Authority / Receiving Office
- JP · JP
- Patent Type
- Patents
- Current Assignee / Owner
- OHBAYASHI GUMI LTD
- Filing Date
- 2022-04-21
- Publication Date
- 2026-05-19
AI Technical Summary
Conventional methods struggle to accurately perform heat load calculations in buildings with transmissive bodies such as partitions due to their complex light transmission properties.
A method is introduced to convert transmissive bodies into window and inner wall elements, allowing for precise heat load calculations by setting specific properties to these elements, including zero heat transfer for the window element and equivalent thermal properties for the inner wall element, which are combined to model the building's heat load.
Enables accurate simulation of heat load in buildings with transmissive bodies by separating and defining the functions of window and inner wall elements, facilitating easy and efficient dynamic heat load calculations.
Smart Images
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Abstract
Description
Technical Field
[0001] The present invention relates to a method, a processing device, or a program.
Background Art
[0002] As the prior art, devices, programs, etc. for performing dynamic heat load calculation are known.
Prior Art Documents
Patent Documents
[0003]
Patent Document 1
Summary of the Invention
Problems to be Solved by the Invention
[0004] In the conventional technology, when a member that transmits light (hereinafter referred to as a "transmissive body") such as a partition inside a building is used, it has been difficult to appropriately execute the heat load calculation of the building.
Means for Solving the Problems
[0005] In view of the above problems, as one aspect of the present invention, there is provided a method for calculating the heat load of a building having rooms partitioned by a transmissive body, which is executed by a processing device, the method including: a window element conversion process of converting the transmissive body into a window element that transmits light; an inner wall element conversion process of converting the transmissive body into an inner wall element that does not transmit light; and a process of calculating the heat load of the building using the window element and the inner wall element.
Effects of the Invention
[0006] According to the present invention, it is possible to appropriately calculate the heat load of a building in which a transmissive body is used inside.
Brief Description of the Drawings
[0007] [Figure 1] This is a flow chart for setting transmissive body elements in an embodiment. [Figure 2] (a) a cross-sectional view and (b) a perspective view of the building in the embodiment. [Figure 3] This diagram shows an overview of the transparent element and the awning element. [Figure 4] This is an explanatory diagram of a building modeled for thermal load calculations. [Figure 5] This is a block diagram of the computer system according to this embodiment. [Modes for carrying out the invention]
[0008] <Calculation method> The following describes a permeable element 1, which is one embodiment of the present invention.
[0009] Permeable element 1 is an element used for calculating the heat load of a permeable element G installed inside the building envelope. Specific examples of permeable elements include glass, roller screens, and blinds.
[0010] The transparent element 1 is configured based on the flow shown in Figure 1. The configuration method is described in detail below.
[0011] In the following explanation, we will assume and use an example of converting a building B (Figure 2) having a permeable element G into a model MB (Figure 4) for thermal load calculation. Building B comprises a permeable element G, an outer shell B1 having at least a portion of a permeable element such as glass, two side walls B2 perpendicular to the outer shell B1, a ceiling B3, and a floor B6. These elements also partition the space within building B, forming two rooms B4 and B5.
[0012] In step S1, the permeable element 1 is defined as a composite of two elements: the window element 11 and the inner wall element 12. That is, the performance of the permeable element 1 is defined as a composite of the performance of the two elements, the inner wall element 12 and the window element 11.
[0013] In step S3, the window element 11 is set as an element that only performs solar radiation acquisition, and in particular, the heat transfer coefficient of the window element 11 is set to 0 (zero). The light transmittance and reflectance of solar radiation of the window element 11 are set according to the physical properties of the actual transparent body G.
[0014] In step S5, an eaves element 2 is set on the outside of the window element 11 (the direction with the outer skin and outer wall). Note that in the window element 11, the calculation of the heat removal amount weighting coefficient WF for room temperature fluctuations is not performed (S9).
[0015] The eaves element 2 is an element for reducing the amount of solar radiation applied to the window element 11. The eaves element 2 is set as an element having the same shape as the portion outside the transparent body G among the side wall B2 and the ceiling B3 (FIG. 3). The amount of solar radiation applied to the window element 11 is reduced based on the shape of the eaves element 2 (details will be described later).
[0016] In the next step S11, an inner wall element 12 is set. The inner wall element 12 is an element that does not transmit solar radiation, that is, an element with a solar radiation transmittance of zero. On the other hand, the thermal conductivity, volumetric specific heat, and density of the inner wall element 12 are set to values equal to the thermal conductivity, volumetric specific heat, and density of the transparent body G, respectively.
[0017] Furthermore, in step S19, the removal heat weight coefficient of the inner wall element 12 is included in the removal heat amount weighting coefficient WF for room temperature fluctuations in each of the rooms B4 and B5. Specifically, the removal heat amount weighting coefficient WFIW for room temperature fluctuations in the rooms B4 and B5 where the inner wall element 12 is arranged at the position of the transparent body G is calculated.
[0018] By setting the model MB by the method as described above, it becomes possible to appropriately execute heat load calculations such as dynamic heat load calculations even in the building B having the transparent body G further inside the window constituting the outer skin (S21).
[0019] The model MB shown in FIG. 4 is part of the model for heat load calculation in the building B. The model MB includes an outer skin part MB1 and room parts MB4 and MB5, which respectively correspond to the outer skin B1, rooms B4, and B5. The outer skin part MB1, room parts MB4, and MB5 are composed of nodes (joints) shown as black circles in the figure and edges (branches) connecting the nodes. For each edge, heat transfer coefficients α0, α r1 , α r3 , α c1 ~α c5 are assigned. Each edge performs heat transfer between nodes according to the assigned heat transfer coefficient. Note that the model MB only shows an example of the modeling in the building B, and various modeling methods other than the above can be considered.
[0020] <Heat Load Calculation> In heat load calculation, the solar radiation on the transparent element 1 shown in FIG. 3 passes through the window element 11 while being blocked by the inner wall element 12. As described above, the amount of solar radiation transmitted through the window element 11 is set based on the physical properties of the actual transparent body G. Therefore, during dynamic heat load calculation, the amount of solar radiation passing through the window element 11 appropriately reflects the performance of the transparent body G.
[0021] Also, the solar radiation reaching the transparent element 1 is appropriately calculated by the eaves element 2. As described above, the eaves element 2 is set based on the shapes of the side wall B2 and the ceiling B3. Therefore, as shown in FIG. 3, the solar radiation blocked by the side wall B2 and the ceiling B3 is appropriately calculated. Based on the shape of the eaves element 2, the relationship between the solar altitude and azimuth at a certain date and time and the amount of solar radiation reaching the transparent element 1 can be calculated. For example, the amount of solar radiation incident on the transparent element 1 is a reduced amount obtained by multiplying the amount of solar radiation input to the outer skin part MB1 by a coefficient within the range of 0 or more and 1.0 or less. In this way, for the transparent element 1 (window element 11), solar radiation acquisition is calculated based on the amount of solar radiation reduced compared to the amount of solar radiation in the outer skin part MB1.
[0022] In the window element 11, which has a thermal transmittance of zero, no heat transfer occurs. On the other hand, the inner wall element 12 is set to have the same thermal conductivity, volumetric specific heat, and density as the permeator G. Therefore, the heat load transferred around the permeator G is appropriately calculated via the inner wall element 12.
[0023] Thus, the heat load calculation for the permeable element 1 is performed as a combination of the window element 11 and the interior wall element 12. As a result of combining the calculations for the two elements, the heat load calculation using model MB is performed appropriately, making it possible to accurately simulate the heat load in building B.
[0024] The above method for configuring Model MB will be automatically, simply, and quickly executed by configuring it as a program that can function on the processing unit and running it on that unit.
[0025] For example, as shown in the block diagram of Figure 5, a computer system C is configured in which a storage device 30 for storing a program and a processing device 40 are able to communicate with each other, and the processing device 40 is made to perform dynamic thermal load calculations using model MB.
[0026] When using a program, some or all of steps S1-S19 may be calculated manually in advance, loaded as settings for model MB, and then the program may be instructed to perform the dynamic load calculation.
[0027] Specific examples of programs include using HASP or New HASP, programs provided by the Japan Association of Building Equipment Engineers. When using HASP or New HASP, it is preferable to input a value that is sufficiently larger than the actual solar radiation (for example, 1000W per square meter) for the limit solar radiation for blind control at the window element 11.
[0028] <Effects> (Aspect 1) The above embodiment is a method for calculating the heat load for a building B having rooms B4 and B5 partitioned by a permeable body G, which is to be executed by a processing device 40, and the method includes a window element conversion process (S1-S5) in which the permeable body G is converted into a window element 11 that transmits light, an interior wall element conversion process (S1, S19) in which the permeable body G is converted into an interior wall element 12 that does not transmit light, and a process for calculating the heat load of building B (S21), which is shown as aspect 1.
[0029] In the above configuration, for a building B that has a permeable element G located further inside the windows that make up the building envelope, the permeable element G is modeled, and thermal load calculations such as dynamic thermal load calculations can be appropriately performed. Therefore, appropriate thermal load calculations can be performed even for buildings with double skins, or buildings with blinds or screens installed inside the rooms.
[0030] (Aspect 2) In the method of aspect 1, the window elementization process includes a process (S5) in which structures located outside the transparent body G are modeled as awnings.
[0031] By configuring the eaves element 2 as described above, it becomes possible to appropriately simulate solar radiation acquisition at the window element 11 and perform heat load calculations.
[0032] (Aspect 3) In either of the methods from aspects 1 to 2, the heat transfer coefficient of the window element 11 is zero. By making this setting, the solar heat load is calculated through the window element 11, while no heat transfer occurs through the window element 11. Therefore, overlap with heat transfer in the inner wall element 12 is prevented. By separating the functions of the window element 11 as an element for calculating the solar heat load and the inner wall element 12 as an element for calculating heat loads other than solar radiation, it becomes possible to perform calculations easily.
[0033] (Aspect 4) In any of the methods from aspects 1 to 3, the inner wall element 12 is set to have the same thermal conductivity, volumetric specific heat, and density as the permeator G. By making the inner wall element 12 function as a heat load calculation element other than solar radiation, calculations can be easily performed.
[0034] (Aspects 5 and 6) The above embodiments present a processing device 40 that implements any of the methods in aspects 1 to 4, and a program to be executed by the processing device 40.
[0035] <Variation> In the above embodiment, it is possible to set further functions and performance for the permeable body G. For example, if the permeable body G is a blind or a screen, the inner wall element 12 or window element 11 can be given the ability to permeate air, and the effects of air permeability and the resulting heat transfer can be added to the heat load calculation. [Explanation of Symbols]
[0036] Transparent element 1, window element 11, interior wall element 12 Building B, side wall B2, ceiling B3, room B4, B5, floor B6 Computer system C, storage device 30, processing unit 40
Claims
1. A method for calculating the heat load for a building having rooms partitioned by permeable materials, which is to be executed by a processing device, The aforementioned transparent material is subjected to a window element transformation process to make it a window element that transmits light, The aforementioned transparent material is subjected to an inner wall element transformation process to make it an inner wall element that does not transmit light, The process involves modeling the permeable body as a composite of the window element and the interior wall element, and calculating the heat load of the building. A method that includes this.
2. The aforementioned window element conversion process is, The method according to claim 1, further comprising a process of modeling a structure located outside the permeable body as an overhang.
3. A method for calculating the heat load for a building having rooms partitioned by permeables, which is to be performed by a processing device, The aforementioned transparent material is subjected to a window element transformation process to make it a window element that transmits light, The aforementioned transparent material is subjected to an inner wall element transformation process to make it an inner wall element that does not transmit light, The process includes calculating the heat load of the building using the aforementioned window elements and interior wall elements, A method wherein the thermal transmittance of the window element is zero.
4. A method for calculating the heat load of a building having rooms partitioned by light-transmitting permeable materials, which is to be performed by a processing device, The aforementioned transparent material is subjected to a window element transformation process to make it a window element that transmits light, The aforementioned transparent material is subjected to an inner wall element transformation process to make it an inner wall element that does not transmit light, The process includes calculating the heat load of the building using the aforementioned window elements and interior wall elements, A method wherein the inner wall element is given the same thermal conductivity, volumetric specific heat, and density as the permeable material.
5. A processing apparatus for carrying out the method of claim 1 or 2.
6. A program that causes a processing unit to execute the method of claim 1 or 2.