Natural ventilation system

Abstract

To obtain an optical opening / closing state of each of a plurality of ventilation windows that can actually realize optimization of an indoor airflow state while shortening the overall analysis time, when performing natural ventilation analysis based on a boundary area wind condition in a boundary area near a building to obtain the optimal opening / closing state of each ventilation window, in a building composed of a plurality of floors, which enables natural ventilation through the plurality of ventilation windows.SOLUTION: A natural ventilation system performs natural ventilation analysis for each of a plurality of floors F1, F2, F3 based on a boundary area wind condition using models MF1, MF2, MF3 of the floors F1, F2, F3 individually, to obtain an initial opening / closing state for overall analysis of each ventilation window that optimizes an airflow state in the floors F1, F2, F3; and performs natural ventilation analysis for the entire building 1 based on a boundary area wind condition using a model M1 of the entire building 1 with the initial opening / closing state for the overall analysis set as an initial value, to determine an optimal opening / closing state of each ventilation window.SELECTED DRAWING: Figure 5

Description

Technical Field

[0001] The present invention relates to a natural ventilation system including: a boundary region wind condition acquisition means for acquiring a boundary region wind condition indicating a wind state in a boundary region near a building in a building composed of a plurality of floors capable of natural ventilation through a plurality of ventilation windows; a natural ventilation analysis means for performing a natural ventilation analysis based on the boundary region wind condition and obtaining an optimal opening / closing state of each ventilation window in which the state of indoor air flow is optimized; and an output means for outputting opening / closing state setting information for setting the opening / closing state of each ventilation window to the optimal opening / closing state.

Background Art

[0002] In a building capable of natural ventilation through a plurality of ventilation windows, there is known a natural ventilation system that obtains an optimal opening / closing state of each ventilation window in which the state of indoor air flow is optimized, and outputs opening / closing state setting information for setting the opening / closing state of each ventilation window to the optimal opening / closing state (see, for example, Patent Document 1). Further, the natural ventilation system described in Patent Document 1 includes means for automatically setting the opening / closing state of each ventilation window to the optimal opening / closing state based on the output opening / closing state setting information.

[0003] For example, in such a natural ventilation system, a boundary region wind condition indicating a wind state such as wind direction and wind speed in a boundary region near a building is acquired, and a natural ventilation analysis based on the acquired boundary region wind condition is performed to obtain an optimal opening / closing state of each ventilation window in which the state of indoor air flow such as indoor wind speed is optimized. And for a building composed of a plurality of floors, the natural ventilation analysis based on the boundary region wind condition is generally executed for the entire building.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, when there are a large number of ventilation windows in a building, in the above natural ventilation analysis, the operation of the indoor air flow state is performed while changing the opening and closing states of the large number of ventilation windows as parameters (variables). Therefore, it may take a considerable amount of time to obtain the optimal opening and closing states of the respective ventilation windows as analysis results, and there is a risk that the optimal opening and closing states are no longer the optimal ones at that time when setting the respective ventilation windows using the analysis results. Further, in the natural ventilation analysis performed for the entire building in this way, since the contribution rate of the opening and closing states of the respective ventilation windows to the indoor air flow state is small, the analysis ends in a state where the achievement rate of optimizing the indoor air flow state (the degree of improvement with respect to the target) is low, and there may be a case where the optimal opening and closing states of the respective ventilation windows for sufficiently optimizing the indoor air flow state cannot be obtained.

[0006] Further, when performing natural ventilation analysis for each of a plurality of floors of a building instead of performing natural ventilation analysis for the entire building, the natural ventilation analysis for each floor can be executed in a short time. However, the optimal opening and closing states of the respective ventilation windows obtained by the analysis may not take into account the influence of, for example, a through space such as a staircase spanning a plurality of floors, and may not be effective for actually realizing the optimization of the indoor air flow state.

[0007] In view of this actual situation, the main problem of the present invention is to perform natural ventilation analysis based on boundary region wind conditions indicating the wind state in the boundary region near the building in a building composed of a plurality of floors capable of natural ventilation through a plurality of ventilation windows, and when obtaining the opening and closing states of the respective ventilation windows that optimize the indoor air flow state as the optimal opening and closing states, while shortening the overall analysis time, to provide a technique for obtaining effective optimal opening and closing states of the respective ventilation windows that can actually realize the optimization of the indoor air flow state.

Means for Solving the Problem

[0008] The first characteristic configuration of the present invention is in a building composed of a plurality of floors capable of natural ventilation through a plurality of ventilation windows, Boundary region wind condition acquisition means for acquiring boundary region wind conditions indicating the state of wind in the boundary region near the building, Natural ventilation analysis means for performing natural ventilation analysis based on the boundary region wind conditions and obtaining the optimal opening / closing states of the ventilation windows as the optimal opening / closing states in which the state of the indoor air flow is optimized, An output means for outputting opening / closing state setting information for setting the opening / closing states of the ventilation windows to the optimal opening / closing states, and a natural ventilation system comprising: The natural ventilation analysis means comprises individual natural ventilation analysis means and overall natural ventilation analysis means, The individual natural ventilation analysis means individually performs natural ventilation analysis based on the boundary region wind conditions using the model of each floor for each of a plurality of floors, and obtains the opening / closing states of the ventilation windows provided on each floor in which the state of the air flow within the floor is optimized as the initial opening / closing states for overall analysis, The overall natural ventilation analysis means performs natural ventilation analysis based on the boundary region wind conditions using the model of the entire building, with the initial opening / closing states for overall analysis obtained by the individual natural ventilation analysis means set as the initial values for the entire building, and obtains the opening / closing states of the ventilation windows provided in the entire building in which the state of the indoor air flow is optimized as the optimal opening / closing states.

[0009] According to this configuration, when performing natural ventilation analysis based on boundary region wind conditions for a building composed of a plurality of floors and obtaining the optimal opening / closing states of the ventilation windows as the optimal opening / closing states in which the state of the indoor air flow is optimized, after individually performing natural ventilation analysis for each of the plurality of floors by the individual natural ventilation analysis means, the natural ventilation analysis is performed for the entire building by the overall natural ventilation analysis means using the analysis results, whereby the optimal opening / closing states of the effective ventilation windows can be obtained in a relatively short time.

[0010] That is, in the natural ventilation analysis individually performed for each of the plurality of floors by the above-described individual natural ventilation analysis means, a model of each floor excluding the influence of a through space such as a staircase spanning multiple floors is used, and the opening / closing state of each ventilation window that optimizes the airflow state within each floor is obtained as the initial opening / closing state for overall analysis. By doing so, the initial opening / closing state for overall analysis as the opening / closing state of each ventilation window provided on each floor can be obtained in a relatively short time as being close to the optimal opening / closing state of each effective ventilation window that can actually achieve the optimization of the indoor airflow state.

[0011] And, in the natural ventilation analysis performed for the entire building by the above-described overall natural ventilation analysis means, a model of the entire building considering the influence of a through space such as a staircase spanning multiple floors is used, and while setting the initial opening / closing state for overall analysis obtained by the natural ventilation analysis by the above-described individual natural ventilation analysis means as the initial value of the opening / closing state of each ventilation window, the opening / closing state of each ventilation window that optimizes the indoor airflow state is obtained as the optimal opening / closing state. By doing so, the analysis is continued until the achievement rate of the optimization of the indoor airflow state sufficiently increases, and the optimal opening / closing state of each effective ventilation window that can actually achieve the optimization of the indoor airflow state can be obtained in a relatively short time.

[0012] Therefore, according to the present invention, in a building composed of a plurality of floors capable of natural ventilation through a plurality of ventilation windows, when performing a natural ventilation analysis based on boundary region wind conditions indicating the state of wind in the boundary region near the building and obtaining the opening / closing state of each ventilation window that optimizes the indoor airflow state as the optimal opening / closing state, it is possible to provide a technique for obtaining the optimal opening / closing state of each effective ventilation window that can actually achieve the optimization of the indoor airflow state while shortening the overall analysis time.

[0013] The second characteristic configuration of the present invention includes weather information acquisition means for acquiring weather information indicating the state of outdoor wind. As the boundary region wind condition acquisition means, it is provided with block wind analysis means for performing a block wind analysis regarding the state of wind using a model of the block where the building is located and obtaining the boundary region wind conditions from the weather information.

[0014] According to this configuration, by performing neighborhood wind analysis regarding the wind state using the model of the neighborhood where the building is provided by the above neighborhood wind analysis means, it is possible to simply and accurately obtain the boundary region wind conditions indicating the wind state in the boundary region near the building from the weather information acquired by the above weather information acquisition means.

[0015] The third characteristic configuration of the present invention is that a plurality of ventilation windows are provided on each of a plurality of floors, and the natural ventilation analysis means obtains the optimal opening / closing state for each ventilation window group composed of the plurality of ventilation windows.

[0016] According to this configuration, even when there are a large number of ventilation windows on each floor, the natural ventilation analysis means does not individually obtain the optimal opening / closing state of each of these many ventilation windows, but obtains the optimal opening / closing state for each ventilation window group composed of a plurality of ventilation windows, so that the overall analysis time can be further shortened.

[0017] The fourth characteristic configuration of the present invention is that it includes ventilation window automatic opening / closing means for automatically setting the opening / closing state of each ventilation window to the optimal opening / closing state based on the opening / closing state setting information output by the above output means.

[0018] According to this configuration, since the opening / closing state of each ventilation window is automatically set to the optimal opening / closing state obtained by a short-time natural ventilation analysis in accordance with the wind state in the boundary region near the building by the above ventilation window automatic opening / closing means, the state of the indoor air flow can always be kept optimized.

Brief Description of the Drawings

[0019]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Mode for Carrying Out the Invention

[0020] Embodiments of the present invention will be described with reference to the drawings. The natural ventilation system (hereinafter referred to as "this natural ventilation system") 10 of this embodiment shown in FIG. 1 is, with reference to FIGS. 4 and 6 as well, in a building 1 composed of a plurality of floors F1, F2, F3 capable of natural ventilation through a plurality of ventilation windows 3. Based on the boundary region wind conditions indicating the state of the wind Wa in the boundary region 50a near the building 1, natural ventilation analysis is performed to obtain the optimal opening and closing states of each ventilation window 3 for optimizing the state of the indoor air flow Wr (inside the building 1) as the optimal opening and closing states. It is configured as a system for this purpose.

[0021] This natural ventilation system 10 employs a configuration for obtaining the optimal opening and closing states of each effective ventilation window 3 that can actually achieve optimization of the state of the indoor air flow Wr while shortening the overall analysis time. Details thereof will be described below. In addition, in this embodiment, the state of closing or opening the ventilation window 3 is referred to as the opening and closing state of the ventilation window 3.

[0022] As shown in FIG. 4, the building 1 is composed of a plurality of floors F1, F2, F3 capable of natural ventilation through a plurality of ventilation windows 3. In addition, in this embodiment, for the sake of simplicity of explanation, the building 1 has a three-story configuration having three floors F1, F2, F3, namely, the first floor F1, the second floor F2, and the third floor F3.

[0023] As shown in Fig. 6, a plurality of ventilation windows 3 are provided on each floor F1, F2, and F3. By appropriately opening the ventilation windows 3, natural ventilation is possible. Each ventilation window 3 is provided with ventilation window automatic opening / closing means 5 such as an actuator that can automatically open and close the ventilation window 3. Each ventilation window automatic opening / closing means 5 operates to set the opening / closing state of the ventilation window 3 to be driven for opening and closing to the optimal opening / closing state included in the opening / closing state setting information received from the output means 30 of the present natural ventilation system 10 described later. In the present embodiment, the ventilation window automatic opening / closing means 5 is configured to open and close the ventilation window 3 in a form that switches the opening degree of the ventilation window 3 between 100% (fully open) and 0% (fully closed). Also, a large number of ventilation windows 3 are provided on each floor F1, F2, and F3. These ventilation windows 3 are grouped into ventilation window groups G each consisting of a plurality of ventilation windows 3. In the present embodiment, a ventilation window group G is set for every three ventilation windows 3.

[0024] As shown in Fig. 1, the present natural ventilation system 10 is configured as a computer system that can access the Internet network 45 and the storage 35. And although details will be described later, the present natural ventilation system 10 includes a weather information acquisition means 11, an analysis means 20, and an output means 30 that function when this computer system executes a predetermined computer program. By these weather information acquisition means 11, analysis means 20, and output means 30, the natural ventilation method shown in Fig. 2 (hereinafter referred to as "the present natural ventilation method") and the analysis process shown in Fig. 3 (hereinafter referred to as "the present analysis process") are executed. Hereinafter, the detailed configuration of the present natural ventilation system 10, as well as the processing flow of the present natural ventilation method and the present analysis process executed by the present natural ventilation system 10, will be mainly described based on Figs. 1, 2, and 3.

[0025] The processing flow of the present natural ventilation method executed by the present natural ventilation system 10 and the related detailed configuration will be mainly described based on Figs. 1 and 2. This natural ventilation system 10 first acquires weather information from a weather information providing system 40 operated by the Japan Meteorological Agency or the like through the Internet network 45 by means of weather information acquisition means 11 (step #01 in FIG. 2). The weather information acquired by the weather information acquisition means 11 includes, as the state of the outdoor wind W in the block 50 where the building 1 is provided, the wind direction and wind speed of the wind W, the presence or absence of rainfall in the block 50, and the like.

[0026] Then, based on the weather information, outdoor air, and indoor temperature and humidity R thus acquired, it is determined whether the natural ventilation method described below can be executed (step #02 in FIG. 2). For example, when rainfall is occurring outdoors, or when natural ventilation cannot be expected to reduce the air conditioning load because the enthalpy of the outdoor air is higher than the enthalpy of the indoor R, the execution of this natural ventilation method is prohibited (no in step #02 of FIG. 2), and in other cases, the execution of this natural ventilation method is permitted (yes in step #02 of FIG. 2). Regarding the above outdoor air and indoor temperature and humidity R, although not shown in the figure, the measured values by the measuring instruments provided in the indoor R can be used.

[0027] When the execution of this natural ventilation method is permitted (yes in step #02 of FIG. 2), the analysis means 20, although details will be described later, executes this analysis process as shown in FIG. 3 in a timely manner, and under the condition of the state of the outdoor wind W in the block 50 indicated by the weather information acquired in step #01 of FIG. 2, obtains the optimal opening and closing states of each ventilation window 3 in which the state of the indoor air flow Wr (inside the building 1) is optimized (step #03 in FIG. 2). Furthermore, in this embodiment, in order to secure the analysis time, this analysis process is executed in advance, and an optimal opening and closing pattern database 35a showing the optimal opening and closing states of each ventilation window 3 for each pattern of the state of the wind direction and wind speed of the outdoor wind W in the assumed block 50 is constructed in the storage 35. Each time the weather information acquisition means 11 acquires weather information, the optimal opening and closing states of each ventilation window 3 corresponding to the state of the outdoor wind W indicated by the acquired weather information are obtained in a form of extraction from the optimal opening and closing pattern database 35a. It is also possible to execute the present analysis process each time the weather information acquisition means 11 acquires weather information.

[0028] The output means 30 outputs opening / closing state setting information for setting the opening / closing state of each ventilation window 3 to the optimal opening / closing state (step #04 in FIG. 2). Then, the ventilation window automatic opening / closing means 5 of each ventilation window 3 automatically sets the opening / closing state of each ventilation window 3 to the optimal opening / closing state based on the opening / closing state setting information output by the output means 30, and performs automatic opening / closing of each ventilation window 3 (step #05 in FIG. 2). Then, the state of the indoor airflow Wr (see FIG. 6) in the entire building 1 is always kept optimized.

[0029] When the execution of the present natural ventilation method is prohibited in the determination process of step #02 in FIG. 2 (no in step #02 in FIG. 2), each ventilation window 3 is manually opened and closed at the discretion of the occupant without performing the opening / closing control of each ventilation window 3 by the ventilation window automatic opening / closing means 5, or closing information for closing each ventilation window 3 is output as the opening / closing state setting information by the output means 30, and each ventilation window 3 is automatically closed based on the closing information output by the output means 30 by the ventilation window automatic opening / closing means 5.

[0030] Next, the processing flow of the present analysis process executed by the present natural ventilation system 10 and the related detailed configuration will be mainly described with reference to FIGS. 1 and 3. As the analysis means 20, a block wind analysis means 21, an individual natural ventilation analysis means 22, and an overall natural ventilation analysis means 23 are provided. The neighborhood wind analysis means 21 (an example of the boundary region wind condition acquisition means) functions as a boundary region wind condition acquisition means for acquiring boundary region wind conditions indicating the state of the wind Wa in the boundary region 50a near the building 1. Specifically, the neighborhood wind analysis means 21 constructs an optimal opening / closing pattern database 35a showing the optimal opening / closing state of each ventilation window 3 for each pattern of the state of the outdoor wind W such as the wind direction and wind speed in the assumed neighborhood 50. For each pattern of the state of the outdoor wind W, the neighborhood wind analysis means 21 performs a neighborhood wind analysis regarding the state of the wind W using the model M50 (see FIG. 4) of the neighborhood 50 where the building 1 is provided (step #11 in FIG. 3). Then, by performing the neighborhood wind analysis process, the neighborhood wind analysis means 21 obtains the state of the wind Wa in the boundary region 50a, such as the wind direction and wind speed, from the state of the wind W such as the outdoor wind direction and wind speed in the neighborhood 50 where the building 1 is provided, as the boundary region wind conditions.

[0031] In the neighborhood wind analysis with the neighborhood 50 as the analysis target, a so-called forward analysis is performed to obtain an unknown result using known analysis conditions. That is, in this neighborhood wind analysis, the state of the outdoor wind W in the neighborhood 50, such as the wind direction and wind speed, is set as the known analysis conditions, and the state of the wind W in the neighborhood 50 is analyzed using the model M50 of the neighborhood 50 so that the analysis conditions are satisfied, and the state of the wind Wa in the boundary region 50a, such as the wind direction and wind speed, is obtained as the boundary region wind conditions that are the unknown results.

[0032] The individual natural ventilation analysis means 22 and the overall natural ventilation analysis means 23 are provided as natural ventilation analysis means for performing natural ventilation analysis based on the boundary region wind conditions acquired as described above and obtaining the opening / closing state of each ventilation window 3 that optimizes the state of the indoor airflow Wr (see FIG. 6) as the optimal opening / closing state.

[0033] The individual natural ventilation analysis means 22 performs natural ventilation analysis (hereinafter referred to as "individual natural ventilation analysis") based on the boundary region wind conditions using the models MF1, MF2, MF3 (see FIG. 5) of the respective floors F1, F2, F3 for each of the plurality of floors F1, F2, F3 individually. (Steps #12F1, #12F2, and #12F3 in FIG. 3). Then, by performing the individual natural ventilation analysis, the individual natural ventilation analysis means 22 obtains the opening / closing states of the respective ventilation windows 3 provided in each of the floors F1, F2, F3 as the initial opening / closing states for overall analysis, where the state of the air flow Wr (see FIG. 6) in each of the floors F1, F2, F3 is optimized.

[0034] That is, the individual natural ventilation analysis means 22 performs the first-floor individual natural ventilation analysis, which is the individual natural ventilation analysis targeting the first-floor F1 (step #12F1 in FIG. 3), the second-floor individual natural ventilation analysis, which is the individual natural ventilation analysis targeting the second-floor F2 (step #12F2 in FIG. 3), and the third-floor individual natural ventilation analysis, which is the individual natural ventilation analysis targeting the third-floor F3 (step #12F3 in FIG. 3).

[0035] In the individual natural ventilation analysis of the first floor, the model MF1 of the first floor F1 (see Fig. 5) is used, and based on the boundary region wind conditions such as the wind direction and wind speed of the wind Wa in the boundary region 50a, the state of the air flow Wr (see Fig. 6) in the first floor F1 is optimized. The opening and closing states of each ventilation window 3 provided in the first floor F1 are obtained as the initial opening and closing states for the overall first floor analysis. In the individual natural ventilation analysis of the second floor, the model MF2 of the second floor F2 (see Fig. 5) is used, and based on the boundary region wind conditions such as the wind direction and wind speed of the wind Wa in the boundary region 50a, the state of the air flow Wr (see Fig. 6) in the second floor F2 is optimized. The opening and closing states of each ventilation window 3 provided in the second floor F2 are obtained as the initial opening and closing states for the overall second floor analysis. In the individual natural ventilation analysis of the third floor, the model MF3 of the third floor F3 (see Fig. 5) is used, and based on the boundary region wind conditions such as the wind direction and wind speed of the wind Wa in the boundary region 50a, the state of the air flow Wr (see Fig. 6) in the third floor F3 is optimized. The opening and closing states of each ventilation window 3 provided in the third floor F3 are obtained as the initial opening and closing states for the overall third floor analysis.

[0036] In the individual natural ventilation analysis for each of the floors F1, F2, and F3 as the analysis targets, a so-called inverse analysis is performed to estimate unknown analysis conditions from known results. That is, in these individual natural ventilation analyses, referring to Fig. 6, the target wind speed (for example, 0.5 m / s) when the state of the air flow Wr in the floors F1, F2, and F3 (indoors R) of the analysis target is optimized is set as a known result, and using the models MF1, MF2, and MF3 of the floors F1, F2, and F3 of the analysis target, the state of the air flow Wr in the models MF1, MF2, and MF3 of the floors F1, F2, and F3 of the analysis target is analyzed so as to satisfy the above-known results. Then, the opening and closing states of each ventilation window 3 when the state of the air flow Wr in the floors F1, F2, and F3 of the analysis target is optimized are obtained as the initial opening and closing states for the overall analysis, which are unknown analysis conditions.

[0037] Furthermore, the storage 35 stores in advance the opening / closing patterns of the ventilation windows 3 on each floor F1, F2, F3. The individual natural ventilation analysis means 22 performs individual natural ventilation analysis while referring to the opening / closing patterns of the ventilation windows 3 stored in the storage 35.

[0038] The models MF1, MF2, MF3 (see FIG. 5) of the respective floors F1, F2, F3 used in the above individual natural ventilation analysis exclude the influence of the through space 2 (see FIG. 6) such as a staircase straddling a plurality of floors F1, F2, F3. Therefore, the initial opening / closing state for overall analysis of each ventilation window 3 on each floor F1, F2, F3 obtained by the above individual natural ventilation analysis is not the optimal opening / closing state itself that can realize the optimization of the state of the air flow Wr (see FIG. 6) within each floor F1, F2, F3, but is close to it. Further, since the influence of the through space 2 and the like is excluded in the models MF1, MF2, MF3 of the respective floors F1, F2, F3, the initial opening / closing state for overall analysis of each ventilation window 3 can be obtained in a relatively short time in the above individual natural ventilation analysis.

[0039] Furthermore, in this individual natural ventilation analysis, an optimal opening / closing state is obtained for each ventilation window group G (see FIG. 6) composed of a plurality of ventilation windows 3. Therefore, the analysis time of the individual natural ventilation analysis is further shortened.

[0040] After the individual natural ventilation analysis means 22 executes the individual natural ventilation analysis (steps #12F1, #12F2, and #12F3 in FIG. 3) with each of the floors F1, F2, F3 as the analysis target, the overall natural ventilation analysis means 23 sets, for the entire building 1, the initial opening / closing state for overall analysis obtained by the individual natural ventilation analysis means 22 as the initial value and performs a natural ventilation analysis (hereinafter referred to as "overall natural ventilation analysis") based on the boundary region wind conditions using the model M1 (see FIG. 5) of the entire building 1 (step #13 in FIG. 3). Then, the overall natural ventilation analysis means 23 obtains, by performing the overall natural ventilation analysis, the opening / closing state of each ventilation window 3 provided in the entire building 1 in which the state of the air flow Wr (see FIG. 6) in the indoor area R is optimized as the optimal opening / closing state for all the floors F1, F2, F3.

[0041] In the overall natural ventilation analysis with the entire Building 1 as the analysis target, a so-called inverse analysis is performed to estimate unknown analysis conditions from known results. That is, in this overall natural ventilation analysis, referring to FIG. 6, when the state of the indoor airflow Wr in the entire Building 1 being analyzed is optimized, the wind speed (for example, 0.5 m / s) is set as a known result, and using the model M1 of the entire Building 1 being analyzed, the state of the airflow Wr in the indoor area R of the entire Building 1 being analyzed is analyzed to satisfy the above-known results. Then, the opening / closing state of each ventilation window 3 provided in the entire Building 1 when the state of the airflow Wr in the indoor area R of the entire Building 1 being analyzed is optimized is obtained as the optimal opening / closing state, which is an unknown analysis condition.

[0042] Furthermore, in the storage 35, the opening / closing patterns of each ventilation window 3 in the entire Building 1 are stored in advance. The overall natural ventilation analysis means 23 performs the overall natural ventilation analysis while referring to the opening / closing patterns of each ventilation window 3 stored in the storage 35.

[0043] The model M1 of the entire Building 1 (refer to FIG. 5) used in the above overall natural ventilation analysis takes into account the influence of the through-space 2 such as the staircase spanning multiple floors F1, F2, F3. Furthermore, in the overall natural ventilation analysis, the initial opening / closing states for overall analysis of each ventilation window 3 on each floor F1, F2, F3 obtained by the individual natural ventilation analysis by the individual natural ventilation analysis means 22 are set as the initial values of the opening / closing states of each ventilation window 3. Therefore, the analysis is continued until the achievement rate of optimizing the state of the indoor airflow Wr (refer to FIG. 6) is sufficiently increased, and the optimal opening / closing states of each effective ventilation window 3 that can actually achieve the optimization of the state of the indoor airflow Wr can be obtained in a relatively short time.

[0044] Furthermore, in this overall natural ventilation analysis, the optimal opening / closing state is obtained for each ventilation window group G (refer to FIG. 6) composed of a plurality of ventilation windows 3. Therefore, the analysis time of the overall natural ventilation analysis is further shortened. Then, the optimal opening / closing state of each ventilation window 3 obtained by the above-described analysis process is stored in the storage 35 as optimal opening / closing pattern database 35a in a state associated with meteorological information indicating the state of the outdoor wind W such as the wind direction and wind speed in the block 50.

[0045] 〔Alternative Embodiment〕 Another embodiment of the present invention will be described. Note that the configurations of the embodiments described below are not limited to being applied individually, and can also be applied in combination with the configurations of other embodiments.

[0046] (1) In the above embodiment, the meteorological information is acquired by the meteorological information acquisition means 11, and the block wind analysis regarding the state of the wind Wa using the model M50 of the block 50 where the building 1 is provided is performed by the block wind analysis means 21 to obtain the boundary region wind conditions used in the natural ventilation analysis from the meteorological information. However, the state of the outdoor wind W such as the wind direction and wind speed may be used as the boundary region wind conditions as they are without performing the block wind analysis. Also, for the state of the outdoor wind W such as the wind direction and wind speed, those measured by an anemometer or a wind vane installed outdoors can be used.

[0047] (2) In the above embodiment, an example in which the natural ventilation system 10 according to the present invention is applied to a three-story building 1 having three floors F1, F2, and F3 has been described. However, the number of floors of the building 1 can be appropriately changed.

[0048] (3) In the above embodiment, in the individual natural ventilation analysis means 22 and the overall natural ventilation analysis means 23, the optimal opening / closing state is obtained for each ventilation window group G consisting of three ventilation windows 3. However, the number of ventilation windows 3 included in the ventilation window group G can be appropriately changed, and the optimal opening / closing state may be obtained individually for each ventilation window 3 without setting the ventilation window group G.

[0049] (4) In the above-described embodiment, the ventilation window automatic opening / closing means 5 for automatically setting the opening / closing state of each ventilation window 3 to the optimal opening / closing state based on the opening / closing state setting information output by the output means 30 is provided, but the ventilation window automatic opening / closing means 5 can also be omitted. In this case, the output means 30 outputs a guidance display prompting the occupant to change the opening / closing state of each ventilation window 3 to the optimal opening / closing state as the opening / closing state setting information, and the occupant who has confirmed the opening / closing state setting information manually changes the opening / closing state of each ventilation window 3 to the optimal opening / closing state, so that the state of the indoor air flow Wr in the entire building 1 is maintained in an optimized state.

[0050] (5) In the above-described embodiment, each analysis is performed with the state of closing or opening the ventilation window 3 as the opening / closing state of the ventilation window 3, and the ventilation window automatic opening / closing means 5 is configured to perform opening / closing control in a form of switching the opening degree of the ventilation window 3 between 100% (open) and 0% (closed). However, a configuration in which the opening degree of the ventilation window 3 can be changed stepwise or continuously by the ventilation window automatic opening / closing means 5 may be adopted, and each analysis may be performed in a form of obtaining the optimal opening degree of the ventilation window 3 as the opening / closing state, and the ventilation window automatic opening / closing means 5 may be configured to control the opening degree of the ventilation window 3 stepwise or continuously.

Explanation of Signs

[0051] 1 Building 3 Ventilation window 5 Ventilation window automatic opening / closing means 10 Natural ventilation system 11 Weather information acquisition means 21 Block wind analysis means 22 Individual natural ventilation analysis means (natural ventilation analysis means) 23 Overall natural ventilation analysis means (natural ventilation analysis means) 30 Output means 50 Block 50a Boundary area F1 1st floor (floor) F2 2nd floor (floor) F3 3rd floor (floor) G Ventilation window group M1 Model of the entire building M50 Model of the block Model of the first floor of MF1 Model of the second floor of MF2 Model of the third floor of MF3 R Indoor W Outdoor wind Wa Wind in the boundary area Wr Indoor air flow

Claims

1. In a building consisting of multiple floors that can be naturally ventilated through multiple ventilation windows, a boundary region wind condition acquisition means for acquiring boundary region wind conditions indicating the state of wind in the boundary region near the building; a natural ventilation analysis means for performing a natural ventilation analysis based on the boundary region wind conditions to obtain the optimal opening and closing states of each ventilation window for optimizing the indoor air flow state as the optimal opening and closing states; an output means for outputting opening and closing state setting information for setting the opening and closing states of each ventilation window to the optimal opening and closing states, a natural ventilation system comprising: the natural ventilation analysis means consists of an individual natural ventilation analysis means and an overall natural ventilation analysis means; the individual natural ventilation analysis means individually performs a natural ventilation analysis based on the boundary region wind conditions using the model of each floor for each of the multiple floors, and obtains the opening and closing states of each ventilation window provided on the floor for optimizing the air flow state within the floor as the initial opening and closing states for overall analysis; the overall natural ventilation analysis means performs a natural ventilation analysis based on the boundary region wind conditions using the model of the entire building with the initial opening and closing states for overall analysis obtained by the individual natural ventilation analysis means set as the initial values for the entire building, and obtains the opening and closing states of each ventilation window provided on the entire building for optimizing the indoor air flow state as the optimal opening and closing states, a natural ventilation system.

2. comprising a weather information acquisition means for acquiring weather information indicating the state of outdoor wind; the natural ventilation system according to claim 1, wherein the boundary region wind condition acquisition means comprises a block wind analysis means for performing a block wind analysis regarding the state of wind using the model of the block where the building is located to obtain the boundary region wind conditions from the weather information.

3. a plurality of ventilation windows are provided on each of the multiple floors; the natural ventilation system according to claim 1 or 2, wherein the natural ventilation analysis means obtains the optimal opening and closing states for each ventilation window group consisting of the plurality of ventilation windows.

4. the natural ventilation system according to claim 1 or 2, further comprising a ventilation window automatic opening and closing means for automatically setting the opening and closing states of each ventilation window to the optimal opening and closing states based on the opening and closing state setting information output by the output means.

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