JP6370106B2 - Natural ventilation system - Google Patents

Description

  The present invention relates to a natural ventilation system that performs natural ventilation through an opening of a building.

  2. Description of the Related Art Conventionally, a natural ventilation system that takes outdoor airflow indoors through a plurality of openings in a building is known (see Patent Documents 1 and 2). In this natural ventilation system, an opening / closing damper is provided at each opening, and a sensor is provided in the vicinity of the opening / closing damper. The sensor measures the wind direction and pressure of the outdoor airflow, opens and closes the open / close damper according to the measurement result, and controls the airflow of the airflow entering the room indoors through the opening.

JP 2014-47606 A JP 2002-257390 A

  However, the above-described natural ventilation system has a structure that simply opens and closes the open / close damper based on only the wind direction and pressure of the airflow at each opening. That is, it controls the amount of airflow entering the indoor from the outside, but does not control the indoor airflow in the living room. Therefore, in practice, the above-described natural ventilation system can not cope with the case where the airflow is excessive or small in each indoor room, or when a strong wind is generated locally in each room, and keeps the indoor environment appropriately. There was a problem that it was not possible.

  An object of this invention is to provide the natural ventilation system which can maintain an indoor environment appropriately.

The natural ventilation system according to claim 1 (for example, a natural ventilation system 1 described later) has an allowable maximum wind speed setting that sets an allowable maximum wind speed of an indoor airflow as an allowable maximum wind speed (for example, an allowable maximum wind speed Vt described later). A plurality of different azimuths (for example, 16 azimuths described later) are set for the means (for example, allowable maximum wind speed setting unit 11 described later) and the outdoor airflow, and a building (for example, for later described) is set for each of the set outdoor airflows. Wind pressure coefficient calculating means (for example, wind pressure coefficients P _{1 to} P _k , which will be described later) in each opening (for example, W _{1 to} W _{k which will be} described later) of the building 2) as a first table. The wind pressure coefficient calculation means 12 described later), the wind direction and wind speed of the outdoor airflow (for example, average wind speed Vout described later) are acquired, and the maximum indoor wind speed (for example, Maximum wind calculating means for calculating a maximum wind speed Vmax) below (e.g., characterized by comprising a maximum wind calculating means 14) below, the.

  According to this invention, the wind pressure at the opening of the building is calculated in consideration of the influence of the surrounding environment of the building, and is used as the first table. And the wind direction and wind speed of an outdoor airflow are acquired, and the indoor maximum wind speed in each case is estimated based on this 1st table. Therefore, since the conditions for performing natural ventilation can be accurately grasped and the indoor airflow in the living room can be controlled within an appropriate range, the indoor environment can be appropriately maintained.

The natural ventilation system according to claim 1 is a plurality of cases (for example, cases C _{0 to} C _n described later) with respect to each of the plurality of set outdoor airflows, wherein at least some of the openings of the building are different from each other. ) For all of the set cases, the wind speed proportional coefficient (for example, wind speed proportional coefficient Q described later) of the indoor airflow is calculated based on the first table, and the calculated wind speed proportional coefficient is calculated. Of these, the largest one is extracted as the maximum wind speed proportional coefficient (for example, the maximum wind speed proportional coefficient Q ₁ max to Q _j max described later) and is used as the second table for calculating the maximum wind speed proportional coefficient (for example, the maximum wind speed proportional coefficient described later). Calculating means 13), wherein the maximum wind speed calculating means obtains a wind direction and a wind speed (for example, an average wind speed Vout described later) of the outdoor airflow, That is, the maximum wind speed proportional coefficient for each of the plurality of cases in the acquired wind direction is read, and the read maximum wind speed proportional coefficient is multiplied by the acquired wind speed to increase the indoor maximum wind speed (for example, the maximum wind speed described later). Vmax) is calculated.

According to this invention, for each wind direction, a plurality of cases in which at least some of the openings of the building openings are different from each other are set. For all of the plurality of cases, the largest one of the wind speed proportional coefficients of the indoor airflow is extracted as the maximum wind speed proportional coefficient and set as the second table.
And the wind direction and wind speed of outdoor airflow are acquired, and the wind direction and wind speed of this acquired outdoor airflow are collated with a 2nd table, and the indoor maximum wind speed in each case is estimated.
Therefore, the conditions for performing natural ventilation can be grasped more accurately, and the indoor environment can be kept more appropriate.

The natural ventilation system according to claim 1 includes an extraction unit (for example, an extraction unit 15 to be described later) that extracts, among the plurality of cases, an indoor maximum wind speed that is equal to or lower than the allowable maximum wind speed. It is characterized by.

  According to this invention, since the case where the estimated maximum wind speed is equal to or less than the maximum allowable wind speed is extracted, the indoor airflow in the living room can be obtained simply by setting the opening of each opening of the building as the opening of the extracted case. It can be controlled within an appropriate range. Therefore, in each indoor room, the resident can spend comfortably while keeping the indoor environment appropriately.

The natural ventilation system according to claim 1 , wherein the opening degree of each opening of the building is controlled so as to become the opening degree set in the extracted case (for example, an opening degree controlling means described later). 16) is further provided.

  According to this invention, the opening degree control means can automatically adjust the opening degree of each opening of the building to control the indoor airflow in the living room within an appropriate range.

The natural ventilation system according to claim 2 is characterized in that the allowable maximum wind speed setting means sets an allowable maximum wind speed based on a determination result of whether or not there is a resident in the room.

  According to this invention, the allowable maximum wind speed setting means sets the allowable maximum wind speed based on the determination result of whether or not there is a resident in the room. For example, if there is a resident in the room, the wind speed in the room is controlled within a comfortable range for the resident, and if there is no resident, the wind speed in the room is increased compared to when there is a resident. , Can increase the ventilation effect.

  According to the present invention, the wind pressure at the opening of the building is calculated in consideration of the influence of the surrounding environment of the building, and is used as the first table. And the wind direction and wind speed of an outdoor airflow are acquired, and the indoor maximum wind speed in each case is estimated using this 1st table. Therefore, since the conditions for performing natural ventilation can be accurately grasped and the indoor airflow in the living room can be controlled within an appropriate range, the indoor environment can be appropriately maintained.

It is a mimetic diagram showing the composition of the natural ventilation system concerning one embodiment of the present invention. It is a figure which shows the specific example which modeled the building controlled by the natural ventilation system which concerns on the said embodiment. It is a flowchart of operation | movement of the natural ventilation system which concerns on the said embodiment. It is a detailed flowchart (the 1) of a part of operation | movement of the natural ventilation system which concerns on the said embodiment. It is a detailed flowchart (the 2) of a part of operation | movement of the natural ventilation system which concerns on the said embodiment. It is a figure which shows the specific example of the 1st table of the natural ventilation system which concerns on the said embodiment. It is a detailed flowchart (the 3) of a part of operation | movement of the natural ventilation system which concerns on the said embodiment. It is a figure which shows the specific example of the 2nd table of the natural ventilation system which concerns on the said embodiment. It is a detailed flowchart (the 4) of a part of operation | movement of the natural ventilation system which concerns on the said embodiment. It is a figure which shows the example of calculation using the 2nd table of the natural ventilation system which concerns on the said embodiment.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
Drawing 1 is a mimetic diagram showing composition of natural ventilation system 1 concerning one embodiment of the present invention.
The natural ventilation system 1 naturally ventilates the building 2 by controlling the opening degree of the opening W of the building 2.
The natural ventilation system 1 includes an input device 3, a display device 4, an arithmetic processing device 5, and a storage device 6.

  The input device 3 is a device for inputting information to the arithmetic processing device 5 and is composed of a keyboard and a mouse.

The display device 4 is a device that displays information input from the input device 3 and information output from the arithmetic processing device 5.
The storage device 6 is a device that stores various types of information, such as a hard disk.
The arithmetic processing unit 5 is a computer, and reads out a program stored in the storage unit 6 and develops and executes it on an OS (Operating System) that performs operation control.

  The arithmetic processing unit 5 is a computer, and is a target building setting means 10, an allowable maximum wind speed setting means 11, a wind pressure coefficient calculation means 12, a maximum wind speed proportional coefficient calculation means 13, a maximum wind speed calculation means 14, an extraction means 15, and an opening degree. Control means 16 is provided.

The arithmetic processing unit 5 includes an outdoor air temperature sensor 20 that measures outdoor air temperature, an indoor air temperature sensor 21 that measures indoor air temperature, an outdoor humidity sensor 22 that measures outdoor humidity, and an indoor humidity that measures indoor humidity. A sensor 23, a rainfall sensor 24 for measuring rainfall, a wind sensor 25 for measuring the wind direction of the outdoor air current, a wind sensor 26 for measuring the wind speed of the outdoor air stream, and a human sensor 27 for detecting the presence of a person are connected. ing.
The wind direction sensor 25 and the wind speed sensor 26 are set on the roof of the building 2. The human sensor 27 is installed in each indoor area A _{1 to} A _j described later.

The target building setting means 10 schematically illustrates the building 2 to be controlled by natural ventilation, and divides the indoor space of the building 2 into a plurality of indoor areas A.
That is, the target building setting means 10 divides the indoor space of the building 2 into indoor areas A that are units for performing air conditioning control, and sets the indoor areas A _{1 to} A _j in the building 2. In addition, the opening W of building 2, the opening _W 1 ~W _k.
Here, the indoor areas A _{1 to} A _j are, for example, spaces partitioned by inner walls.

FIG. 2 is a diagram illustrating a specific example of the building 2 schematically.
For example, as shown in FIG. 2, a predetermined one floor indoor space of the building 2 is divided into indoor areas A _{1 to} A ₃ . Further, an opening W of building 2, and the opening _W 1 to _W-6.

The permissible maximum wind speed setting means 11 sets the permissible maximum wind speed of the indoor airflow as the permissible maximum wind speed Vt for each of the indoor areas A _{1 to} A _j of the building 2.

The wind pressure coefficient calculating means 12 sets 16 directions for the upper air flow, and calculates the wind pressure coefficients P _{1 to} P _k at the openings W _{1 to} W _k of the building 2 for each of the set 16 upper air flows. To generate a first table.
Here, the upper air flow is an air flow over the building 2.

Further, the wind pressure coefficient calculating means 12 calculates the wind direction and wind speed proportional coefficient of the roof airflow for each of the 16 directions of the upper airflow, and generates a correspondence table of the wind direction and the wind speed between the rooftop airflow and the upper airflow.
Here, the roof airflow is an airflow on the roof of the building 2. The rooftop airflow is affected by the topography around the building 2 and the arrangement and shape of the surrounding buildings, but the upper airflow is not affected by this.

The maximum wind speed proportional coefficient calculating means 13 sets a plurality of cases C _{0 to} C _{n in} which at least some of the openings of the openings W 1 to Wk of the building 2 are different from each other for each of the set 16-direction upper airflows. Then, the wind velocity proportional coefficient Q of the indoor airflow is calculated for all of the set cases C _{0 to} C _n based on the first table, and the maximum wind speed in the indoor areas A1 to Aj among these calculated wind velocity proportional coefficients Q is calculated. Those are extracted as maximum wind speed proportional coefficients Q ₁ max to Q _j max to generate the second table.

The maximum wind speed calculation means 14 acquires the wind direction and wind speed of the upper air flow. Then, reading the maximum wind speed proportional coefficient _Q 1 _{max~Q j} max in case C for wind direction over a stream obtained in the second table, and obtains the maximum wind proportionality coefficient _Q 1 _{max~Q j} max thus read out The indoor maximum wind speeds V ₁ max to V _j max in the indoor areas A1 to Aj are calculated by multiplying the wind speed of the upper air flow.

The extraction unit 15 extracts a plurality of cases C in which all of the indoor maximum wind speeds V ₁ max to V _j max are equal to or less than the allowable maximum wind speed Vt.
The opening degree control means 16 controls the opening degree of the openings W _{1 to} W _k of the building 2 so as to be the opening degree set in the extracted case C.

  Hereinafter, operation | movement of the natural ventilation system 1 is demonstrated, referring the flowchart of FIG.

In step S _< b> 1, the target building setting means 10 schematically models the building 2 that is a natural ventilation control target, and divides the indoor space of the building 2 into a plurality of indoor areas A _{1 to} A _j .

In step S2, the permissible maximum wind speed setting means 11 sets the permissible maximum wind speed of the indoor airflow as the permissible maximum wind speed Vt for each of the indoor areas A _{1 to} A _j of the building 2.
Step S2 will be described in detail later.

In step S3, the wind pressure coefficient calculation means 12 sets 16 directions for the upper air flow, and the wind pressure coefficients P _{1 to} P at the openings W _{1 to} W _k of the building 2 for each of the set 16 upper air flows. _k is calculated to generate a first table.
Further, the wind pressure coefficient calculating means 12 calculates the wind direction and the wind speed proportional coefficient of the air flow (roof air flow) on the roof of the building 2 for each of the 16 directions of the upper air flow, and the wind direction and the wind speed of the roof air flow and the upper air flow. Generate a correspondence table.
Step S3 will be described in detail later.

In step S4, the maximum wind speed proportional coefficient calculation means 13 sets a plurality of cases C _{0 to} C _n having different openings of the openings W _{1 to} W _k of the building 2 for each of the set 16-direction upper air flows. To do. Then, the maximum wind speed proportional coefficient calculating means 13 calculates the wind speed proportional coefficient Q of the indoor airflow based on the first table for all of the set cases C _{0 to} C _n , and these calculated wind speed proportional coefficients Q the largest of the indoor area A1~Aj generating a second table to extract a maximum wind proportional coefficient _Q 1 _{max~Q j} max of.
Step S4 will be described in detail later.

In step S5, the sensors 20 to 24 measure a natural environment other than the wind environment.
That is, the outdoor air temperature sensor 20 measures the outdoor air temperature, and the indoor air temperature sensor 21 measures the indoor air temperature. The outdoor humidity sensor 22 measures outdoor humidity, the indoor humidity sensor 23 measures indoor humidity, and the rainfall sensor 24 measures rainfall.

In step S6, the arithmetic processing unit 5 determines whether or not to perform natural ventilation based on the measured outdoor air temperature, indoor air temperature, humidity, and rainfall.
When this determination is Yes, the process proceeds to step S7, and when this determination is No, the process proceeds to step S10.

In step S7, the sensors 25 and 26 measure the wind environment.
That is, the wind direction sensor 25 measures the wind direction of the roof airflow, and the wind speed sensor 26 measures the wind speed of the roof airflow.

In step S8, the maximum wind speed calculation means 14 calculates the wind direction and wind speed of the upper air flow according to the correspondence table generated in step S3 based on the measured wind direction and wind speed of the roof airflow.
Then, the maximum wind speed calculating means 14 reads out the maximum wind speed proportional coefficients Q ₁ max to Q _j max in the case C of the wind direction of the upper air flow in the second table, and the read maximum wind speed proportional coefficients Q ₁ max to Q Q Multiplying _j max by the wind speed of the upper air flow, the maximum indoor wind speed V ₁ max to V _j max in the indoor areas A _{1 to} A _j is calculated. Further, the opening degree control means 16 extracts a plurality of cases C in which all indoor maximum wind speeds V ₁ max to V _j max are equal to or less than the allowable maximum wind speed Vt.
Step S8 will be described later in detail.

In step S9, the opening control unit 16, the opening of the opening W ₁ to _W-k building 2, controlled to be opening set in case C which is the extraction.

In step S10, the opening degree control means 16 controls to close all apertures _W 1 to _W-k.

Hereinafter, the operation of step S2 will be described with reference to the flowchart of FIG.
In step S41, for each of the indoor areas A _{1 to} A _j , measurement points for room temperature (Ta) and ceiling radiation panel temperature (Trad), which are factors for setting the allowable maximum wind speed Vt, are set.
Here, the ceiling radiant panel temperature is radiant heat radiated from the ceiling surface. Note that the measurement points of the room temperature and the ceiling radiant panel temperature are not limited to one location, and a plurality of locations may be set and the average of the measurement values at these locations may be used.

  In step S42, room temperature (Ta) and ceiling radiation panel temperature (Trad) are measured at the set measurement points.

In step S43, the allowable maximum wind speed setting means 11 sets the maximum allowable wind speed when the occupant is in the room as the allowable maximum wind speed Vt1 in the room for each of the indoor areas A _{1 to} A _j .

Specifically, for example, the allowable maximum wind speed Vt1 in the room is set as follows.
When Ta ≧ 25 [° C.] and Trad ≧ 23 [° C.], Vt1 = 0.2 [m / sec].
When Ta ≧ 25 [° C.] and Trad <23 [° C.], Vt1 = 0.1 [m / sec].
When Ta <25 [° C.], Vt1 = 0.1 [m / sec].

  That is, in an environment where indoor occupants feel hot, the occupants can spend comfortably even if the indoor wind speed is somewhat high. On the other hand, in an environment where indoor residents feel cool, it is necessary to keep the indoor wind speed low to some extent in order for the residents to spend comfortably. That is, Vt1 is the maximum wind speed that the resident feels comfortable.

In step S44, the allowable maximum wind speed setting means 11 sets the maximum value of the wind speed allowable when the occupant is absent for each of the indoor areas A _{1 to} A _{j as} the allowable maximum wind speed Vt2 when absent.
That is, when there are no residents in the room, it is sufficient to suppress the wind speed to such an extent that documents and accessories are not blown away. That is, Vt2 is the maximum value of the wind speed at which the document or accessory is not blown away.

In step S45, the allowable maximum wind speed setting means 11 sets one of the indoor areas _A 1 to A _j.

In step S46, the allowable maximum wind speed setting means 11 determines whether there is a resident in the set indoor area A.
Specifically, when the human sensor 27 installed in the indoor area A detects the presence of a person, it is determined that there is a resident in the indoor area A, and the human sensor 27 detects the presence of a person. If not detected, it is determined that there is no resident in the indoor area A.
If this determination is Yes, since there are residents, the process proceeds to step S47. On the other hand, if this determination is No, there is no resident, and the process moves to step S48.

In step S47, the permissible maximum wind speed setting unit 11 sets the permissible maximum wind speed Vt1 for the set indoor area A to the permissible maximum wind speed Vt.
In step S48, the allowable maximum wind speed setting means 11 sets the absent maximum allowable wind speed Vt2 to the allowable maximum wind speed Vt for the set indoor area A.

In step S49, the permissible maximum wind speed setting means 11 determines whether or not the permissible maximum wind speed Vt has been set for all of the indoor areas A _{1 to} A _j .
If this determination is No, the process proceeds to step S50. On the other hand, if this determination is Yes, the process ends.

  In step S50, the allowable maximum wind speed setting means 11 sets another indoor area A that has not been set, and returns to step S46.

  Hereinafter, the operation of step S3 will be described with reference to the flowchart of FIG.

In step S51, the wind pressure coefficient calculating means 12 sets outdoor air flow analysis conditions.
Specifically, the shape of the building 2, the position of the opening W of the building 2, the relative position of the surrounding building with respect to the building 2, and the shape of the surrounding building are set.
Further, 16 directions are set as the wind direction of the upper air flow.

  In step S52, the wind pressure coefficient calculating means 12 sets the wind direction of the upper air flow to one of 16 directions.

In step S53, the wind pressure coefficient calculation means 12 performs a three-dimensional fluid analysis of the air flow outside the building 2 with the set wind direction of the upper air flow, and wind pressure coefficients P _{1 to} P of the openings W _{1 to} W _k of the building 2. Calculate _k .

Here, the three-dimensional fluid analysis is CFD analysis (Computational Fluid Dynamics). Specifically, a mesh is generated around the building 2 in the virtual space, and a wind pressure coefficient of a point corresponding to the opening W of the building 2 among the lattice points of the CFD mesh is obtained. The wind direction and wind speed proportional coefficient of the point corresponding to are obtained.
The three-dimensional fluid analysis is an isothermal analysis that ignores the influence of buoyancy due to the temperature of the air. Thereby, the analysis of a necessary condition can be completed within the range of realistic analysis cases.

  In step S54, the wind pressure coefficient calculation means 12 generates a correspondence table of wind direction and wind speed between the rooftop airflow that is the airflow over the building 2 and the upper airflow that is the airflow over the building 2.

Further, the wind pressure coefficient calculating means 12 generates a first table by associating the set wind direction with the calculated wind pressure coefficients P _{1 to} P _k of the openings W _{1 to} W _k of the building 2, and stores them in the storage device 6. Remember.
FIG. 6 is a diagram illustrating a specific example of the first table.
For example, as shown in FIG. 6, when the wind direction is southeast, the wind pressure coefficients of the openings W1 to W6 are 0.15, 0.20, 0.20, −0.05, −0.10, −0. 05.

In step S55, the wind pressure coefficient calculation means 12 determines whether or not the analysis of the outdoor airflow has been completed for all the wind directions of the upper airflow.
If this determination is No, the process proceeds to step S56. On the other hand, if this determination is Yes, the process ends.

In step S56, the wind pressure coefficient calculation means 12 sets the wind direction of the upper air flow to another wind direction that has not been set, and returns to step S53.
For example, if the wind direction is southeast, the wind direction is shifted by one clockwise and set to southeast.

  Hereinafter, the operation of step S4 will be described with reference to the flowchart of FIG.

In step S61, the maximum wind speed proportional coefficient calculating means 13 sets the total number N of openings W that are finally half open.
In the present embodiment, the total number N of openings W that are finally half-opened is set. However, the present invention is not limited thereto, and the ratio of the openings W that are finally half-opened may be set. For example, when there are 10 openings W and the ratio of the openings W to be half-opened is set to 30%, the three openings W are finally set to a half-open state.

In step S62, the maximum wind speed proportional coefficient calculating means 13 sets the wind direction of the upper air flow to one of 16 directions.
For example, as shown in FIG. 8, southeast is set as the wind direction of the upper air flow.

In step S63, the maximum wind speed proportional coefficient calculating means 13 reads the first table for the upward air flow in the set wind direction, and sorts the building openings in descending order of the wind pressure coefficient.
For example, as shown in FIG. 8, when the wind direction is north, the openings W _{1 to} W ₆ are arranged in descending order of the wind pressure coefficient, and W ₂ , W ₃ , W ₁ , W ₄ , W ₆ , W ₅ and To do.

In step S _< b> 64, the maximum wind speed proportional coefficient calculating unit 13 sets a state in which all the openings W _{1 to} W _k of the building 2 are fully opened as one case C.
For example, as shown in FIG. 8, when the wind direction of the upper air flow is southeast, a state in which all the openings W _{1 to} W ₆ are fully opened is referred to as case C ₀ .

In step S65, the maximum wind speed proportional coefficient calculating means 13 is the wind direction set by the upper air flow and the case C in which the openings W1 to Wk of the building 2 are set. The air velocity proportional coefficient Q of the indoor airflow is calculated for each of the indoor areas A _{1 to} A _j .

  In step S66, the maximum wind speed proportional coefficient calculating means 13 extracts the largest one of the calculated wind speed proportional coefficients as the maximum wind speed proportional coefficient Qmax and associates the set case C with the maximum wind speed proportional coefficient Qmax. A second table is generated and stored in the storage device 6.

For example, as shown in FIG. 8, in the case C ₀ where the wind direction of the upper air flow is southeast, the maximum wind speed proportional coefficients of the indoor areas A _{1 to} A ₃ are 0.30, 0.30, 0. 20

In step S67, the maximum wind speed proportional coefficient calculating means 13 determines whether or not the number of openings W that are half-opened in the building 2 is the set total number N.
If this determination is No, the process proceeds to step S68. On the other hand, when this determination is Yes, since the analysis of the indoor airflow has been completed for all cases with respect to the upward airflow of the set wind direction, the process proceeds to step S69.

In step S68, the maximum wind speed proportional coefficient calculating means 13 sets the state having the highest wind pressure coefficient among the openings W that are fully open of the building 2 to be half open, and sets this state as a new case C, and then proceeds to step S66. Return.
For example, as shown in FIG. 8, when the wind direction over the airflow is southeast, the highest opening W ₂ is the wind pressure coefficients of the opening W ₁ to _W-6 and half-open state, this state, a new case C Set as ₁ .

In step S69, the maximum wind speed proportional coefficient calculating means 13 determines whether or not the analysis of the indoor airflow has been completed for all the wind directions of the upper airflow.
If this determination is No, the process proceeds to step S70. On the other hand, when this determination is Yes, the analysis of the indoor airflow has been completed for all cases of the upward airflow in all the wind directions, and the process ends.

In step S70, the maximum wind speed proportional coefficient calculating means 13 sets the wind direction of the upper air flow to another wind direction that has not been set, and the process returns to step S63.
For example, if the wind direction is southeast, the wind direction is shifted by one clockwise and set to southeast.

  Hereinafter, the operation of step S8 will be described with reference to the flowchart of FIG.

  In step S81, the maximum wind speed calculating means 14 calculates the average of the wind direction of the rooftop airflow for a predetermined time (for example, 10 minutes) and sets it as the average wind direction of the rooftop airflow. Then, the maximum wind speed calculating means 14 calculates the average wind direction of the upper air flow according to the correspondence table generated in step S54 based on the average wind direction of the roof airflow, and corresponds to the calculated average wind direction of the upper air flow. Read the second table from the storage device.

For example, if the average wind direction Calculation the sky airflow is southeast, as shown in FIG. 8, reads the case C ₀ -C ₆ wind direction is south-east. Of these, the case _{C 2,} the maximum wind speed proportional coefficient Qmax of the indoor areas _A 1 to A ₃ has a 0.05,0.05,0.20. Further, in case _{C 3,} the maximum wind speed proportional coefficient Qmax indoor area A1~A3 has a 0.05,0.05,0.03.

  In step S82, the maximum wind speed calculation means 14 calculates the average wind speed of the rooftop airflow for a predetermined time (for example, 10 minutes) to obtain the average windspeed of the rooftop airflow. Then, the maximum wind speed calculation means 14 calculates the average wind speed of the upper air flow based on the average wind speed of the rooftop airflow according to the correspondence table generated in step S54, and sets it as the average wind speed Vout of the upper air flow.

In step S83, the maximum wind speed calculation means 14 changes the average wind speed Vout of the upper air flow to the maximum wind speed proportional coefficients Q ₁ max to Q _j max of the indoor areas A _{1 to} A _j of each case C of the read second table. Multiply. Thereby, the maximum wind speeds V ₁ max to V _j max of the indoor areas A _{1 to} A _j of each case C are calculated.

For example, when the average wind speed Vout of the upper air flow is 3 m / s, the average wind speed 3 m / s is multiplied by the maximum wind speed proportional coefficient of the indoor areas A _{1 to} A ₃ of the case C ₂ as shown in FIG. In addition, the maximum wind speed is 0.15, 0.15, and 0.60 m / s. Further, when the average wind speed of 3 m / s of the upper air flow is multiplied by the maximum wind speed proportional coefficient of the indoor areas A _{1 to} A ₃ of the case C ₃ , the maximum wind speed is 0.15,. 15, 0.09 m / s.

In step S84, the extraction means 15 extracts the case C in which all the maximum wind speeds V ₁ max to V _j max in the indoor areas A _{1 to} A _j are equal to or lower than the allowable maximum wind speed Vt.

For example, if the allowable maximum wind speed Vt and 0.2 m / s, as shown in FIG. 10, in the case _{C 2,} the maximum velocity of the indoor area _{A 3} is more than 0.2 m / s, Case _{C 2} is not extracted . On the other hand, in Case _{C 3,} since all of the maximum wind speed of the indoor areas _A 1 to A ₃ is less than 0.2 m / s, the case _{C 3} is extracted.

According to this embodiment, there are the following effects.
(1) Considering the influence of the surrounding environment of the building 2, the wind pressure of the openings W _{1 to} W _k of the building 2 is calculated and used as the first table. And the wind direction and wind speed of an upper airflow are acquired, and the indoor maximum wind speed in each case is estimated based on this 1st table. Therefore, since the conditions for performing natural ventilation can be accurately grasped and the indoor airflow in the living room can be controlled within an appropriate range, the indoor environment can be appropriately maintained.

(2) For each wind direction, setting at least a portion of the opening different from each other case _C 0 -C _n of the opening _W 1 to _W-k building 2. For all of these cases C _{0 to} C _n , the largest one of the wind speed proportional coefficients of the indoor airflow is extracted as the maximum wind speed proportional coefficients Q ₁ max to Q _j max and set as the second table.
Then, the wind direction and wind speed of the upper air flow are acquired, and the indoor maximum wind speed Vmax in each case C is estimated by comparing the acquired wind direction and wind speed of the upper air flow with the second table. Therefore, the conditions for performing natural ventilation can be grasped more accurately, and the indoor environment can be kept more appropriate.

(3) Since the case where the estimated maximum wind speed Vmax is equal to or less than the allowable maximum wind speed Vt is extracted, the openings of the openings W _{1 to} W _k of the building 2 are only set to the openings set in the extracted case C. Thus, the indoor airflow in the living room can be controlled within an appropriate range. Therefore, in each indoor room, the resident can spend comfortably while keeping the indoor environment appropriately.

(4) by opening control means 16, the opening of each aperture W ₁ to _W-k building 2 adjusted automatically, to control the indoor air flow in the room in a proper range.

  (5) The permissible maximum wind speed setting means 11 sets the permissible maximum wind speed based on the determination result of whether or not there is a resident in the room. When there is a resident in the room, the wind speed in the room is controlled to be within a comfortable range for the resident, and when there is no resident, the air speed is increased in the room compared to when there is a resident. The effect can be increased.

(6) In the present embodiment, in step S65, the maximum wind speed proportional coefficient is obtained by three-dimensional analysis. As a result, the indoor situation can be accurately grasped and predicted with high accuracy.
In step S65, it is conceivable to actually measure the indoor wind speed and use this measured value as disclosed in Japanese Patent Laid-Open No. 5-248684. However, with this method, the places where measurement is possible are limited, and the wind speed in the room varies greatly depending on the location, so it is impossible to grasp a situation in which strong wind is generated at locations other than the measurement point.

  (7) In the above-mentioned JP 2002-257390 A, the ventilation frequency is used as an index of the indoor wind speed. Using this index, the average wind speed in the room can be obtained, but the spatial distribution of the wind speed cannot be obtained. Since the indoor wind speed varies greatly depending on the position, Japanese Patent Laid-Open No. 2002-257390 cannot deal with a case where a strong wind is locally generated indoors. On the other hand, in this embodiment, since the indoor maximum wind speed is estimated by three-dimensional fluid analysis based on the first table, it is possible to accurately predict the situation in which strong wind is generated indoors.

  In addition, the opening serving as an intake port for outside air can have an opening through which strong wind blows in a strong wind and an opening that does not, depending on the wind direction, but JP 2002-257390 A controls using the total value of the opening area. Therefore, the rate of increase / decrease of the opening area cannot be changed depending on the position of the opening to prevent the strong wind from flowing into the room. On the other hand, in this embodiment, since the rate of increase / decrease of the opening area is changed depending on the position of the opening, it is possible to make the entire ventilation amount constant while preventing the strong wind from flowing into the room.

  Japanese Patent Application Laid-Open No. 2002-257390 considers the case where buildings are densely packed around and the case where the buildings are not dense, but does not consider the influence of the wind pressure coefficient of each opening due to the shape of the surrounding buildings. On the other hand, in this embodiment, since the three-dimensional fluid analysis is performed, it is possible to consider the influence of the ventilation amount of each opening due to the shape of the surrounding building.

It should be noted that the present invention is not limited to the above-described embodiment, and modifications, improvements, etc. within a scope that can achieve the object of the present invention are included in the present invention.
For example, in this embodiment, in step S9, the opening of the opening W ₁ to _W-k of opening control means 16 Building 2, the control was such that the opening degree of the extracted case C, but not limited to . That is, the extracted case C may be displayed on the display device 4 and the openings of the openings W _{1 to} W _k may be manually set as the opening of the extracted case C.

In the present embodiment, in each case C, the openings W _{1 to} W _k are fully opened or half-opened. However, the present invention is not limited to this, and the openings W _{1 to} W _k are set to an opening between the fully opened and half-opened positions. Alternatively, the opening may be intermediate between half-open and fully-closed. In this case, for example, the opening degree may be estimated by an interpolation process such as an interpolation method or an extrapolation method based on the result of the airflow analysis performed.

  In this embodiment, the three-dimensional fluid analysis is performed in step S53 and step S65. However, the present invention is not limited to this, and a model imitating the position and shape of the building 2 and the surrounding building is manufactured and a wind tunnel experiment is performed. May be.

  In the present embodiment, the human sensor 27 that detects the presence of a person is used. However, the present invention is not limited thereto, and a human detection sensor that individually recognizes a person may be used.

In the present embodiment, the indoor areas A _{1 to} A _j are spaces partitioned by inner walls. However, the present invention is not limited to this, and one space is appropriately divided, such as a space partitioned by air conditioning zoning. It is good also as a separate indoor area.

  In the present embodiment, the three-dimensional fluid analysis is performed in step S65. However, the present invention is not limited thereto, and the ventilation circuit divides the room into one or several points of contact to analyze the macroscopic air flow. Network analysis may be performed.

DESCRIPTION OF SYMBOLS 1 ... Natural ventilation system 2 ... Building 3 ... Input device 4 ... Display apparatus 5 ... Arithmetic processing device 6 ... Memory | storage device 10 ... Target building setting means 11 ... Allowable maximum wind speed setting means 12 ... Wind pressure coefficient calculation means 13 ... Maximum wind speed proportional coefficient Calculation means 14 ... Maximum wind speed calculation means 15 ... Extraction means 16 ... Opening degree control means 20 ... Outdoor temperature sensor 21 ... Indoor temperature sensor 22 ... Outdoor humidity sensor 23 ... Indoor humidity sensor 24 ... Rainfall sensor 25 ... Wind direction sensor 26 ... Wind speed Sensor 27 ... Human sensor W _{1 to} W _k ... Building opening P _{1 to} P _k ... Wind pressure coefficient at building opening A _{1 to} A _j ... Indoor area Q ... Wind speed proportional coefficient Q ₁ max to Q _j max ... Maximum wind speed Proportional coefficient Vout: Average wind speed of the upper air flow Vmax: Maximum wind speed in the indoor area Vt: Maximum allowable wind speed Vt1: Maximum allowable wind speed in the room Vt2: Not Maximum allowable wind speed at the time C _{0 to} C _n ...

Claims (2)

An allowable maximum wind speed setting means for setting an allowable maximum wind speed of the indoor airflow as an allowable maximum wind speed;
Wind pressure coefficient calculating means for setting a plurality of different directions for the outdoor airflow, calculating the wind pressure coefficient at each opening of the building for each of the plurality of outdoor airflows set as a first table,
For each of the plurality of outdoor airflows set, set a plurality of cases in which the opening of at least a part of the opening of the building is different from each other, all of the plurality of cases set based on the first table, Calculating a wind speed proportional coefficient of the indoor airflow, extracting a maximum one of the calculated wind speed proportional coefficients as a maximum wind speed proportional coefficient, and calculating a maximum wind speed proportional coefficient as a second table;
The wind direction and wind speed of the outdoor airflow are acquired, the maximum wind speed proportional coefficient for each of the plurality of cases in the acquired wind direction in the second table is read, and the acquired wind speed is used as the read maximum wind speed proportional coefficient. Multiplying the maximum wind speed calculating means for calculating the maximum wind speed indoors ,
An extraction means for extracting the indoor maximum wind speed below the allowable maximum wind speed among the plurality of cases;
Opening control means for controlling the opening of each opening of the building so as to be the opening set in the extracted case . A natural ventilation system, comprising: The natural ventilation system according to claim 1 , wherein the allowable maximum wind speed setting unit sets the allowable maximum wind speed based on a determination result of whether or not there is a resident in the room.

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