Shielding coefficient prediction system
The shading coefficient prediction system addresses the challenge of calculating indoor shading coefficients by incorporating louver dimensions and sunlight types, enhancing the accuracy and simplicity of heat shielding assessments.
Patent Information
- Authority / Receiving Office
- JP · JP
- Patent Type
- Patents
- Current Assignee / Owner
- DAIWA HOUSE INDUSTRY CO LTD
- Filing Date
- 2022-09-30
- Publication Date
- 2026-06-16
AI Technical Summary
Existing systems struggle to accurately calculate the indoor shielding coefficient of a room with a louvered opening, particularly failing to account for the influence of direct sunlight.
A shading coefficient prediction system that includes a processing device to calculate the shading coefficient through louvers, considering the dimensions of slat members, gaps, and direct vs. diffuse sunlight, with units to determine direct and diffuse heat shielding degrees and a correction mechanism for contact with window glass.
Enables more accurate and simplified prediction of the shading coefficient by accounting for direct and diffuse sunlight, improving the calculation of heat shielding through louvers.
Smart Images
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Abstract
Description
Technical Field
[0001] The present invention relates to a shielding coefficient prediction system including a processing device that calculates the indoor shielding coefficient through a louver in a state where louver members are held at intervals and installed in an opening of a building.
Background Art
[0002] Conventionally, the indoor shielding coefficient through an opening has been obtained from tests using actual environments or devices that simulate solar radiation pseudo - physically. However, actually, manufacturing a device that simulates indoor solar radiation is a large - scale task, and it is not easy to simply obtain the shielding coefficient. From this perspective, for example, a system including a processing device that calculates the solar heat load based on meteorological data, preset data, and measurement data has been proposed. In this processing device, the solar heat load is calculated based on the total daily solar radiation amount, window area, and window material information.
Prior Art Documents
Patent Documents
[0003]
Patent Document 1
Summary of the Invention
Problems to be Solved by the Invention
[0004] However, for example, when a louver is provided at an opening of a building, it is not easy to calculate the indoor shielding coefficient of the building using the system shown in Patent Document 1, and in this calculation, the influence of direct sunlight is not taken into account.
[0005] The present invention has been made in view of such problems, and an object thereof is to provide a shielding coefficient prediction system that can more simply and accurately predict the shielding coefficient of the interior of a room formed by an opening when a louver is provided at the opening of a building. [Means for solving the problem]
[0006] In view of the above issues, the shading coefficient prediction system according to the present invention is a shading coefficient prediction system comprising a processing device that calculates the shading coefficient of the room through a louver when a louver in which slat members are held at intervals is installed in an opening of a building, the processing device comprising a louver setting unit that sets the dimensions of the slat members constituting the louver and the size of the gap between adjacent slat members, and a processing device that, at the position of the sun at a specific time, calculates the shading coefficient of the room through the louver when the louver set by the louver setting unit is installed relative to the total area of the opening The device is characterized by comprising: a direct sunlight calculation unit that calculates the ratio of the area of the irradiated portion that is irradiated by direct sunlight as the direct sunlight ratio; a direct heat shielding degree calculation unit that calculates the direct heat shielding degree by multiplying the ratio of the direct solar radiation at the point to the total solar radiation at the point by the direct sunlight ratio; a diffuse heat shielding degree calculation unit that calculates the diffuse solar radiation by subtracting the direct solar radiation from the total solar radiation, and calculates the diffuse heat shielding degree as the ratio of the diffuse solar radiation to the total solar radiation; and a shielding coefficient calculation unit that calculates the shielding coefficient by adding the direct heat shielding degree and the diffuse heat shielding degree.
[0007] The shading coefficient is generally defined as the solar radiation shading coefficient (SC value). The "shading coefficient" according to the present invention is a coefficient that indicates the degree of heat shielding from heat transmitted into the room through the opening by the louvers. This shading coefficient takes an upper limit of 1.0 when the louvers are not installed, and represents the ratio of solar radiation gain when the louvers are installed. It is an evaluation variable that changes so that the shading coefficient approaches 0 as the shielding of the opening increases due to the louvers. In other words, the larger the value of the "shading coefficient," the smaller the shielding effect of the louvers. According to the present invention, the direct heat shielding calculation unit can calculate the direct heat shielding rate as the ratio of the area of the irradiated portion of the opening that is irradiated by direct sunlight by the louvers set by the louvers, relative to the total area of the opening, at the position of the sun at a specific time. As a result, the direct heat shielding degree calculation unit can easily calculate the degree of direct heat shielding to the room through the opening by direct sunlight via the louvers. The "direct heat shielding degree" is the shielding coefficient of the louvers due to direct sunlight only, and is a variable that changes so that the shielding coefficient approaches 0 as the shielding performance of the opening by the louvers increases. On the other hand, the diffuse heat shielding degree due to diffused light other than direct sunlight can be calculated by the diffuse heat shielding degree calculation unit. Here, assuming that diffused light reaches the room uniformly, and since it does not depend on the shape of the louvers, the "diffuse heat shielding degree" can be calculated from the ratio of diffuse solar radiation to total solar radiation. The "diffuse heat shielding degree" is a shielding coefficient that depends only on the diffuse solar radiation, and is a variable that changes so that the shielding coefficient approaches 0 as the amount of solar radiation due to diffuse light (diffuse solar radiation) decreases. In summary, the shielding coefficient due to the louvers can be easily calculated by the shielding coefficient calculation unit by adding the direct heat shielding degree and the diffuse heat shielding degree.
[0008] In a more preferred embodiment, the opening is covered with window glass, the louver setting unit sets whether or not the louver's finial is in contact with the window glass, and the diffusion heat shielding degree calculation unit corrects the diffusion heat shielding degree by a correction coefficient set based on the thermal conductivity of the louver material if the finial is in contact with the window glass.
[0009] Here, the degree of diffuse heat shielding calculated while excluding the effect of direct sunlight is affected when the louver's slat members are in contact with the window glass, as heat from the louver is transferred into the room through the window glass. Therefore, according to this embodiment, when the slat members are in contact with the window glass, the diffuse heat shielding calculation unit can improve the accuracy of the calculated degree of diffuse heat shielding by correcting the degree of diffuse heat shielding with a correction coefficient set based on the thermal conductivity of the louver material.
[0010] In a more preferred embodiment, the opening is covered with window glass, the louver setting unit sets whether or not the louver's finial is in contact with the window glass, and the diffusion heat shielding degree calculation unit corrects the diffusion heat shielding degree by a correction coefficient set based on the thickness of the louver's finial and the size of the gap, if the finial is not in contact with the window glass.
[0011] According to this embodiment, the degree of diffuse heat shielding calculated excluding direct sunlight changes depending on the thickness of the louver's slat members and the size of the gaps when the louver's slat members are not in contact with the window glass. Therefore, according to this embodiment, the degree of diffuse heat shielding calculation unit can improve the accuracy of the calculated degree of diffuse heat shielding by correcting the degree of diffuse heat shielding with a correction coefficient set based on the thickness of the louver members and the size of the gaps when the louver members are not in contact with the window glass.
[0012] In a more preferred embodiment, the louver is a vertical louver in which the vane members extend vertically and a plurality of the vane members are installed at intervals in the horizontal direction, and the direct sunlight calculation unit calculates the direct sunlight based on the azimuth angle of the sun at the specific time and the azimuth angle of the opening.
[0013] In the case of vertical louvers, the ratio of the area of the opening illuminated by direct sunlight (direct sunlight coefficient) to the total area of the opening can be calculated more accurately from the azimuth angle of the sun at a specific time and the azimuth angle of the opening. [Effects of the Invention]
[0014] According to the present invention, when louvers are installed in an opening in a building, the shading coefficient of the room in which the opening is formed can be calculated more easily. [Brief explanation of the drawing]
[0015] [Figure 1] (a) is a schematic conceptual diagram of vertical louvers as seen from the outside of the building, and (b) is a schematic conceptual diagram of vertical louvers as seen from inside the building. [Figure 2] This is a schematic diagram of a system including a shielding coefficient processing device according to this embodiment. [Figure 3] This is a block diagram of the shielding coefficient processing device according to this embodiment. [Figure 4] Figure 3 is a partial cross-sectional view of a vertical louver used to explain the setting conditions set by the louver setting unit and the calculations performed by the direct sunlight ratio calculation unit. [Figure 5] This is an explanatory diagram showing an example of the direct sunlight coefficient calculated by the direct sunlight coefficient calculation unit shown in Figure 4, in response to changes in the angle of solar radiation. [Figure 6] Figure 2 is a flowchart for setting the correction coefficient for the degree of diffuse heat shielding. [Modes for carrying out the invention]
[0016] The calculation device for the shading coefficient according to the present embodiment will be described below with reference to FIGS. 1 to 6.
[0017] 1. Regarding the opening 7 of the building 100 and the vertical louvers 5 FIG. 1(a) is a schematic conceptual diagram of the vertical louvers viewed from the outside of the building, and FIG. 1(b) is a schematic conceptual diagram of the vertical louvers viewed from the inside of the building. The processing device 10 according to the present embodiment is a device that calculates the shading coefficient from the opening 7 to the interior 21 in a state where the vertical louvers 5 in which the blade members 51 are held at intervals are installed in the opening 7 of the building 100.
[0018] In the present embodiment, window glass 71 is attached to the opening 7, and vertical louvers 5 are attached to the wall portion 4 of the building 100 so as to cover the opening 7. In the present embodiment, the vertical louvers 5 are composed of a plurality of long blade members 51, 51,... extending along the vertical direction, and adjacent blade members 51, 51 are held at equal intervals (equal pitch) in the horizontal direction. In the present embodiment, as an example, the vertical louvers 5 constituting a part of the building 100 are illustrated. However, for example, instead of the vertical louvers 5, horizontal louvers may be used.
[0019] Here, due to the dimensions of the blade members 51 of the vertical louvers 5, the intervals between them, the position of the sun, etc., the heat insulation properties of sunlight (including natural light) by the vertical louvers 5 are different, and the shading coefficients taken into the room from sunlight through the vertical louvers 5 are different. Therefore, in the present embodiment, the following processing device 10 is used to calculate the shading coefficient simply and accurately.
[0020] 2. Regarding the hardware configuration of the shading coefficient prediction system 1 As shown in Figure 2, the prediction system 1 has a processing unit 10 which includes a storage unit 10A composed of ROM, RAM, etc., and an arithmetic unit 10B composed of a CPU, etc. The storage unit 10A records conditions such as a program for performing calculations described later, the dimensions of the opening 7 of the building 100, the dimensions of the slat members 51, the size of the gaps between adjacent slat members 51, and the material, and the arithmetic unit 10B executes the program, etc.
[0021] The prediction system 1 may include an input device 31 and an output device 32. In this case, the input device 31 and the output device 32 are connected to the processing unit 10. In this embodiment, the input device 31 and the output device 32 may be integrated into a single touch panel display.
[0022] The input device 31 receives initial conditions for executing the program described above (for example, the dimensions of the wing plates and their spacing) and program data. The data entered by the input device 31 is stored in the storage unit 10A. The output device 32 displays the results calculated by the processing unit 10.
[0023] 3. Software configuration of the processing unit 10 In this embodiment, as shown in Figure 3, the processing apparatus 10 comprises at least a louver setting unit 11, a direct radiation coefficient calculation unit 12, a direct heat shielding degree calculation unit 13, a diffuse heat shielding degree calculation unit 14, and a shielding coefficient calculation unit 15.
[0024] 3-1. Regarding the louver setting section 11 Figure 3 shows the slat members 51 of the vertical louver 5 aligned horizontally, and a cross-sectional view. The louver setting unit 11 sets the dimensions of the slat members 51 constituting the vertical louver 5 and the size S of the gap between adjacent slat members 51 based on input from the input device 31. For example, in this embodiment, as shown in Figure 4, the dimensions of the slat member 51 are set to the thickness t and depth L of the slat member 51. In this embodiment, the spacing (pitch) P between adjacent slat members 51 is equal and corresponds to the sum of the thickness t of the slat member 51 and the size S of the gap between the slat members 51. The size S of the gap is the distance between the surfaces of opposing slat members 51, 51 along the arrangement direction (horizontal direction) when multiple slat members 51, 51 are arranged together.
[0025] 3-2. Regarding the direct sunlight calculation unit 12 The direct sunlight calculation unit 12 calculates the direct sunlight coefficient as the ratio of the area of the opening 7 (window glass 71 in this embodiment) that is irradiated by direct sunlight R to the total area of the opening 7, with the vertical louvers 5 set by the louver setting unit 11 installed, at the position of the sun at a specific time.
[0026] Specifically, as shown in Figure 4, when direct sunlight R is shone toward the opening 7 during the day, some of the direct sunlight R that hits the vane members 51 does not reach the opening 7, and a shadowed portion (shadowed portion) a is formed on the opening 7 (window glass 71). On the other hand, some of the direct sunlight R that passes between the vane members 51, 51 reaches the opening 7, and an illuminated portion (irradiated portion) b is formed on the opening 7 (window glass 71). Therefore, the direct sunlight rate can be calculated by dividing the total area of the illuminated portion b of the opening 7 (window glass 71) by the total area of the opening 7 (window glass 71).
[0027] In this embodiment, the slat members 51, 51 of the vertical louver 5 are installed at equal intervals in the horizontal direction. As shown in Figure 4, the sum of the width A of the shaded portion a and the width B of the illuminated portion b in the horizontal direction corresponds to the pitch P. Therefore, in the opening 7 (window glass 71), the shaded portion a and the illuminated portion b are repeatedly arranged along the horizontal direction at a pitch P. From this point of view, the direct sunlight coefficient V can be easily calculated by calculating "V = B / (A + B) = B / P". The shielding coefficient D can be expressed as A / P, and satisfies the relationship "direct sunlight coefficient V = 1 - shielding coefficient D".
[0028] To clarify, the width A of the shaded area a and the width B of the illuminated area b can be calculated using the thickness t of the vane members 51, the size S of the gaps between the vane members 51, and the angle θ of sunlight formed by the direct light R with respect to the normal direction of the opening 7 (window glass 71) in the horizontal direction. Specifically, the width A of the shaded area a can be calculated using "A = L × sinθ + t". The width B of the illuminated area b can be calculated using "B = PA".
[0029] Here, since the direct radiation rate changes depending on the solar radiation angle θ as described above, the solar radiation angle θ can be determined if the azimuth angle of the sun and the azimuth angle of the opening 7 are known. As shown in Figure 5, for example, if true north is set to 0° and clockwise is considered a positive angle, and the range of the sun's azimuth angle is set to 160° to 220°, and the azimuth angle of the opening 7 is set to 180° (the window glass 71 faces due south), then the range of the solar radiation angle θ changes from -20° to 40°. Within this range of solar radiation angle θ, the direct radiation rate calculation unit 12 calculates the direct radiation rate in the same way as described in Figure 4.
[0030] In Figure 5, the direct sunlight coefficient is calculated when the thickness t of the wing plate member 51 is 30 mm, the depth dimension L is 150 mm, and the pitch P is 150 mm. For example, when the sun's azimuth angle is 160°, the sun is located in the south-southeast direction, and the window glass 71 faces due south, so the solar radiation angle θ is -20°. In this case, the direct sunlight coefficient is 65 mm / 150 mm, which is 0.43.
[0031] Furthermore, when the sun's azimuth angle is 180°, the sun is directly south, and the window glass 71 faces directly south, so the solar radiation angle θ is 0°. In this case, the direct sunlight coincides with the normal direction of the window glass 71, so the direct sunlight coefficient is 120mm / 150mm, which is 0.80.
[0032] Furthermore, when the sun's azimuth angle is 220°, the sun is located in the southwest, and the window glass 71 faces due south, so the solar radiation angle θ is 40°. In this case, direct sunlight is completely blocked by the vertical louvers, so the direct sunlight coefficient is 0.00.
[0033] In this way, the ratio of the area of the illuminated portion b of the aperture 7 that is illuminated by direct sunlight to the total area of the aperture 7 (i.e., the direct sunlight coefficient) can be calculated more accurately from the azimuth angle of the sun and the azimuth angle of the aperture 7.
[0034] In Figure 5, the range of the sun's azimuth angle was varied, but the sun's azimuth angle changes with time. Therefore, the direct illumination calculation unit 12 may, for example, pre-read the sun's azimuth angle for each time period, as shown in Table 1 below, and use this sun's azimuth angle to calculate the direct illumination.
[0035] [Table 1]
[0036] Table 1 shows that the direct sunlight coefficient is 0.00 until 10:00, and remains 0.00 after 14:00. When calculating the amount of solar heat gain, for example, the average of the direct sunlight coefficients at 11:00, 12:00, and 13:00 may be used as the direct sunlight coefficient. In this way, the direct sunlight coefficient calculation unit 12 calculates the time periods at which the direct sunlight coefficient is greater than 0 at equal intervals, and calculates the average of these values to determine the average direct sunlight coefficient for the day.
[0037] 3-3. Regarding the direct heat shielding degree calculation unit 13 The direct heat shielding degree calculation unit 13 calculates the direct heat shielding degree by multiplying the ratio of direct solar radiation at a given point to total solar radiation at that point by the direct radiation coefficient. Here, total solar radiation may be obtained from meteorological data or from data for sunny days at that point. Direct solar radiation can be measured at that point using a rotating pyranometer. If total solar radiation is St, direct solar radiation is Sd, direct radiation coefficient is V, and direct heat shielding degree is Vd, then the direct heat shielding degree can be calculated as "Vd = V × Sd / St".
[0038] 3-4. Regarding the Diffusion Heat Shielding Degree Calculation Unit 14 The diffuse heat shielding degree calculation unit 14 calculates the diffuse solar radiation by subtracting the direct solar radiation from the total solar radiation, and calculates the ratio of diffuse solar radiation to total solar radiation as the diffuse heat shielding degree. Here, diffuse solar radiation is obtained from various angles through reflection from the sky and ground objects, regardless of the angle or altitude of the sun. Therefore, if the vertical louvers 5 and the window glass 71 of the opening 7 are in contact (close contact), it will affect the diffuse heat shielding degree, and it is assumed that some solar heat penetration will be hindered by shading caused by diffuse solar radiation from the vertical louvers 5. From this point of view, the diffuse heat shielding degree calculation unit 14 corrects the diffuse heat shielding degree Vr depending on whether or not the slat members 51 of the vertical louvers 5 are in contact with the window glass 71 placed in the opening 7.
[0039] Here, if we denote the total solar radiation as St, the direct solar radiation as Sd, the degree of diffuse heat shielding as Vr, and the correction coefficient as k, then the degree of diffuse heat shielding can be calculated as "Vr = k(St - Sd) / St". When determining this correction coefficient k, we determine whether the slat member 51 is in contact with the window glass 71, as shown in step S601 of the flowchart in Figure 6. If the slat member 51 is in contact with the window glass 71 (YES), we proceed to step S602.
[0040] From step S602 onward, the diffusion heat shielding degree calculation unit 14 corrects the diffusion heat shielding degree using a correction coefficient k set based on the thermal conductivity of the material of the vertical louver 5, if the slat member 51 is in contact with the window glass 71. The correction coefficient k is greater than 0 and less than or equal to 1. Here, in step S602, it is determined that the thermal conductivity of the material of the slat member 51 of the vertical louver 5 is greater than or equal to a predetermined value. If it is greater than or equal to the predetermined value (YES), heat is easily transferred from the slat member 51 to the window glass 71, so the process proceeds to step S603 and the correction coefficient k = 1. In this case, the diffusion heat shielding degree is essentially not corrected.
[0041] On the other hand, in step S602, if the thermal conductivity of the material of the slat member 51 of the vertical louver 5 is less than a predetermined value (NO), it is considered that the vertical louver 5 has high heat shielding capability. Therefore, in this case, the process proceeds to step S604, where the maximum value of the direct sunlight V calculated for each time step is substituted into the correction coefficient k. However, instead of steps S602 to S604, the correction coefficient k may be set to a value that approaches 1 as the thermal conductivity of the material of the slat member 51 of the vertical louver 5 increases.
[0042] Thus, the degree of diffuse heat shielding calculated excluding direct sunlight R is affected when the slat members 51 of the vertical louver 5 are in contact with the window glass 71, as heat from the vertical louver 5 is transferred to the room through the window glass 71. Therefore, the degree of diffuse heat shielding calculation unit 14 can improve the accuracy of the calculated degree of diffuse heat shielding by correcting the degree of diffuse heat shielding with a correction coefficient k set based on the thermal conductivity of the material of the vertical louver 5 when the slat members 51 are in contact with the window glass 71.
[0043] On the other hand, if in step S601 it is determined that the vane member 51 is not in contact with the window glass 71 (NO), then in steps S605 to S607, the diffuse heat shielding degree calculation unit 14 corrects the diffuse heat shielding degree using a correction coefficient k set based on the thickness t of the vane member 51 and the size of the gap S. In this case, the correction coefficient k takes a value greater than 0 and less than 1. When the direct radiation coefficient under the condition that the solar radiation angle θ is 0° is taken as V0, the correction coefficient k is determined based on this direct radiation coefficient V0. This direct radiation coefficient can be calculated as "V0 = S / (S + t) = S / P".
[0044] Here, if the direct sunlight coefficient V0 is large, the thickness t of the vane member 51 is thin, so the width A of the shaded area a due to direct sunlight is narrow, making it susceptible to the effects of heat from diffused sunlight. On the other hand, if the direct sunlight coefficient V0 is small, the thickness t of the vane member 51 is thick, so the width A of the shaded area a due to direct sunlight is wide, making it less susceptible to the effects of heat from diffused sunlight.
[0045] Therefore, in step S605, if the direct sunlight coefficient V0 is greater than or equal to a predetermined value (for example, 0.75) (YES), the process proceeds to step S606, where the correction coefficient k is set to a large constant value (for example, k=0.90) because the shielding performance of the vertical louvers 5 due to diffused solar radiation is low. On the other hand, if the direct sunlight coefficient V0 is less than a predetermined value (for example, 0.75) (NO), the process proceeds to step S607, where the correction coefficient k may be set to a smaller constant value (for example, k=0.85) because the shielding performance of the vertical louvers 5 due to diffused solar radiation is high. Alternatively, instead of steps S605 to S607, the correction coefficient k may be set so that it increases as the magnitude of the direct sunlight coefficient V0 increases.
[0046] Thus, the degree of diffuse heat shielding calculated excluding direct sunlight changes depending on the thickness t of the vertical louver member 51 and the size of the gap S when the louver member 51 of the vertical louver 5 is not in contact with the window glass 71. Therefore, the diffuse heat shielding calculation unit 14 can improve the accuracy of the calculated degree of diffuse heat shielding by correcting the degree of diffuse heat shielding with a correction coefficient k set based on the thickness t of the louver member 51 and the size of the gap S when the louver member 51 is not in contact with the window glass 71.
[0047] 3-5. About the shielding coefficient calculation unit 15 The shielding coefficient calculation unit 15 calculates the shielding coefficient SC by adding the direct heat shielding degree Vd and the diffuse heat shielding degree Vr. When the series of calculations are put together in a single equation, the shielding coefficient SC can be expressed by the following equation (1).
[0048] SC=Vr+Vd=k(St-Sd) / St+V×Sd / St…(1) however, SC: Shading coefficient Vr: Diffuse heat shielding degree Vd: Direct heat shielding degree k: Correction coefficient St: Total solar radiation Sd: Direct solar radiation V: Direct radiation rate (B / P) B: Width of the irradiated area b P: Pitch of the wing plate members
[0049] Here, for example, the direct sunlight coefficient (average value) V calculated by the direct sunlight coefficient calculation unit 12 for each hour from 10:00 to 14:00 is 0.29, and the total solar radiation St is 1000 W / m². 2 Therefore, the direct solar radiation Sd is 700 W / m². 2 And if the correction factor k is 1.00, SC={1.00(1000-700) / 1000}+{0.29×700 / 1000}=0.503 This is the result.
[0050] In this way, the direct heat calculation unit 12 can calculate the direct heat coefficient as the ratio of the area of the irradiated portion b of the opening 7 that is irradiated by direct sunlight R from the sun, set by the vertical louver 5 set by the louver setting unit 11, to the total area of the opening 7, at the position of the sun at a specific time. As a result, the direct heat shielding degree calculation unit 13 can easily calculate the degree of direct heat shielding to the room 21 through the opening 7 by direct sunlight R from the sun via the vertical louver 5. On the other hand, the degree of diffuse heat shielding other than direct sunlight R is calculated by the diffuse heat shielding degree calculation unit 14, so the shielding coefficient through the opening 7 can be easily calculated by adding the direct heat shielding degree and the diffuse heat shielding degree, and this value can be predicted as the shielding coefficient.
[0051] Although embodiments of the present invention have been described in detail above, the present invention is not limited to the embodiments described above, and various design modifications can be made without departing from the spirit of the invention as described in the claims.
[0052] For example, in this embodiment, the shading coefficient was calculated (predicted) when using vertical louvers, but the shading coefficient could also be calculated (predicted) when using horizontal louvers in which the slat members extend horizontally and multiple slat members are installed at vertical intervals. In this case, the direct sunlight coefficient can be calculated based on the altitude of the sun. [Explanation of Symbols]
[0053] 1: Prediction system, 10: Processing unit, 11: Louver setting unit, 12: Direct radiation calculation unit, 13: Direct heat shielding degree calculation unit, 14: Diffuse heat shielding degree calculation unit, 15: Shielding coefficient calculation unit, 5: Vertical louver, 51: Blade member, 7: Opening, 71: Window glass, b: Irradiated area
Claims
1. A shading coefficient prediction system comprising a processing device for calculating the shading coefficient of a room through a louver, in which louver members are held at intervals, when the louver is installed in an opening of a building, The aforementioned processing apparatus is A louver setting unit for setting the dimensions of the slat members constituting the louver and the size of the gap between adjacent slat members, A direct sunlight calculation unit calculates the ratio of the area of the opening that is illuminated by direct sunlight to the total area of the opening, with the louvers set by the louver setting unit installed, at the position of the sun at a specific time, as the direct sunlight calculation unit. A direct heat shielding degree calculation unit calculates the direct heat shielding degree by multiplying the ratio of direct solar radiation at a given location to total solar radiation at that location by the direct heat coefficient, A diffuse heat shielding degree calculation unit calculates the diffuse solar radiation by subtracting the direct solar radiation from the total solar radiation, and calculates the ratio of the diffuse solar radiation to the total solar radiation as the diffuse heat shielding degree. A shielding coefficient prediction system characterized by comprising: a shielding coefficient calculation unit that calculates the shielding coefficient by adding the direct heat shielding degree and the diffuse heat shielding degree.
2. The aforementioned opening is covered with window glass. The louver setting unit sets whether or not the slat member of the louver is in contact with the window glass. The shielding coefficient prediction system according to claim 1, characterized in that the diffusion heat shielding degree calculation unit corrects the diffusion heat shielding degree by a correction coefficient set based on the thermal conductivity of the louver material when the slat member is in contact with the window glass.
3. The aforementioned opening is covered with window glass. The louver setting unit sets whether or not the slat member of the louver is in contact with the window glass. The shielding coefficient prediction system according to claim 1, characterized in that the diffusion heat shielding degree calculation unit corrects the diffusion heat shielding degree by a correction coefficient set based on the thickness of the finial member and the size of the gap when the finial member is not in contact with the window glass.
4. The louver is a vertical louver in which the slat members extend vertically and a plurality of the slat members are installed at intervals in the horizontal direction. The shading coefficient prediction system according to any one of claims 1 to 3, characterized in that the direct light calculation unit calculates the direct light coefficient based on the azimuth angle of the sun at the specific time and the azimuth angle of the aperture.