JP2010019484A - Ventilation amount estimating device and ventilation amount estimating method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a ventilation amount estimating device for estimating a ventilation amount accurately at low cost using indoor contaminant concentration and estimating the number of people in a room with high accuracy from the estimated ventilation amount. <P>SOLUTION: The ventilation amount estimating device for estimating the ventilation amount of a predetermined closed space has a contaminant concentration measuring means installed in the predetermined closed space to measure the concentration of a predetermined contaminant, and an arithmetic means for determining the ventilation amount by substituting the concentration of the predetermined contaminant at two different times measured by the contaminant concentration measuring means in a time zone where the generated amount of the predetermined contaminant is known, as the concentration at the first time and second time in a relational expression representing the contaminant concentration in the closed space at the first time based on influence from the contaminant concentration at the second time before the first time and influence from the generation of the contaminant in the closed space, taking the ventilation amount in the closed space into consideration. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to a ventilation amount estimation device using indoor pollutant concentration, and more particularly, ventilation capable of estimating a ventilation amount at low cost and with high accuracy, and enabling accurate estimation of the number of indoor persons with the estimated ventilation amount. The present invention relates to a quantity estimation device and the like.

  Conventionally, various proposals related to indoor air conditioning control have been made from the viewpoint of energy saving and improvement of the indoor environment. In such air conditioning control, grasping the number of people in the room to be controlled is one important factor, and various methods have been proposed for grasping the number of people in the room.

  As the prior art, there are a method of measuring the number of people passing through the entrance of a room and a method of analyzing an image taken by a camera. In addition, Patent Documents 1 and 2 below describe how to know the number of people in a room using the carbon dioxide concentration.

Patent Document 1 below shows that the number of people in a room is calculated from the air amount and carbon dioxide concentration on the air supply side of the target room, the air amount and carbon dioxide concentration on the exhaust side, and the like. Patent Document 2 below discloses a technique for optimally controlling an air conditioner in response to a sudden change in the indoor environment, in which detecting the number of indoor persons using a CO ₂ sensor is disclosed. Yes.
JP 2004-278868 A JP-A-6-26687

  However, the above-described method using the measurement at the entrance of the room or the camera has a problem that cost and labor are required to introduce the system.

Further, in the method described in Patent Document 1, it is necessary to install devices in the air supply and exhaust ducts of the room, and it is not easy to apply to already completed equipment, and costs are also high. There was a problem. Furthermore, in the method, since the ventilation of the target room is made only by the air supply and exhaust ducts, in consideration of the fact that ventilation from the windows and doors of the room also actually occurs, the method Therefore, it can be said that there is a problem with accuracy in grasping the number of people in the room. Further, Patent Document 2 does not specifically show how the number of indoor persons is detected by the CO ₂ sensor.

  The above-mentioned determination of ventilation volume is an important element not only for estimating the number of people in the room but also for optimal air conditioning control and the determination of the indoor environment. No method has been proposed.

  Therefore, an object of the present invention is a ventilation amount estimation device using indoor pollutant concentration such as carbon dioxide concentration, which can estimate the ventilation amount at low cost and with high accuracy, and further, with the estimated ventilation amount, a highly accurate indoor volume. It is to provide a ventilation amount estimation device and the like that enable estimation of the number of people.

  In order to achieve the above object, according to one aspect of the present invention, a ventilation amount estimation device for estimating a ventilation amount in a predetermined closed space is installed in the predetermined closed space, and a predetermined pollutant concentration is determined. Contaminant concentration measuring means for measuring, and the concentration of the pollutant in the closed space at the first time from the concentration of the pollutant at the second time before the first time, taking into consideration the ventilation amount in the closed space The relational expression expressed on the basis of the influence of the pollutant on the closed space and the influence of the pollutant generation on the closed space is different from the difference 2 measured by the pollutant concentration measuring means in the known time zone. And calculating means for obtaining the ventilation amount by substituting the concentration of the predetermined pollutant at the time as the concentration at the first time and the second time.

  Furthermore, in the above invention, the preferable aspect is that the calculation means obtains the ventilation amount for a plurality of different periods, and sets an average value of the obtained plurality of ventilation amounts as a ventilation amount in the predetermined closed space. It is characterized by that.

  Furthermore, in the above-mentioned invention, a preferable aspect thereof is that the calculating means changes the concentration of the predetermined contaminant measured by the contaminant concentration measuring means during a time zone in which the amount of contaminant generated is known. It is determined based on.

  Further, in the above invention, one aspect is characterized in that the predetermined pollutant is carbon dioxide, and the source of the predetermined pollutant is a person existing in the predetermined closed space. To do.

  Moreover, in the above invention, according to one aspect, the calculation means further applies the calculated ventilation amount to the relational expression, and the predetermined time at two different times measured by the pollutant concentration measurement means. The number of persons existing in the predetermined closed space is obtained by substituting the concentration of the pollutant as the concentration at the first time and the second time.

  In order to achieve the above object, another aspect of the present invention provides a ventilation amount estimation method for estimating a ventilation amount in a predetermined closed space by means of a pollutant concentration measuring unit installed in the predetermined closed space. Measuring the concentration of a predetermined pollutant, and the concentration of the pollutant in the closed space at the first time in consideration of the amount of ventilation in the closed space, the pollutant at the second time before the first time. The amount of the predetermined pollutant generated is measured by the pollutant concentration measuring means in a known time zone in a relational expression expressed based on the influence from the concentration of the pollutant and the influence from the occurrence of the pollutant in the closed space. And substituting the concentration of the predetermined pollutant at two different times as the concentrations at the first time and the second time to obtain the ventilation amount.

  Further objects and features of the present invention will become apparent from the embodiments of the invention described below.

  Embodiments of the present invention will be described below with reference to the drawings. However, this embodiment does not limit the technical scope of the present invention. In the drawings, the same or similar elements are denoted by the same reference numerals or reference symbols.

  FIG. 1 is a configuration diagram according to the present embodiment of an environment information acquisition system using a ventilation amount estimation device to which the present invention is applied. The ventilation amount estimation device 1 shown in FIG. 1 is a device to which the present invention is applied, and the carbon dioxide concentration at a predetermined time is determined based on the influence from the carbon dioxide concentration at the previous time and the influence of the increase in carbon dioxide by the occupants in the room. Apply the measured value of carbon dioxide concentration in the time zone when the number of people in the room is known to the relational expression to estimate the ventilation volume of the target room, and apply the estimated ventilation volume to the above relational expression. The number of people in the room at an arbitrary time is estimated.

  As shown in FIG. 1, the present ventilation amount estimation device 1 is installed in a room 2 (closed space) for estimating a ventilation amount. In the present embodiment, an environment information acquisition system 100 is shown as an example when the ventilation amount estimation device 1 is used. In the system, the ventilation amount estimation device 1 is installed in each of a plurality of rooms 2. As shown in FIG. 1, they are connected to the environment information server 3 through a network 4.

  Although details of the ventilation amount estimation device 1 will be described later, information such as the ventilation amount, the number of people in the room, the carbon dioxide concentration, etc. acquired by the device is appropriately sent to the environment information server 3 via the network 4. The information is transmitted and held in the environment information server 3 in a usable state. The stored information can be used, for example, for air-conditioning control and environment grasping of each room 2 where the ventilation amount estimation device 1 is installed. The room 2 includes an air conditioning facility, a door for entering and exiting a person, a window, and the like (not shown). The environment information server 3 can be configured by a computer system such as a personal computer, and the network 4 can be configured by a LAN, a WAN, the Internet, or the like.

FIG. 2 is a configuration diagram of the ventilation amount estimation apparatus 1 according to the present embodiment. As shown in FIG. 2, the ventilation amount estimation device 1 includes a concentration measurement unit 11, a calculation unit 12, an operation unit 13, and an I / F unit 14. The concentration measuring unit 11 is a sensor that measures the concentration of contaminants in the room 2, and here is a concentration sensor (CO ₂ sensor) of carbon dioxide. The CO ₂ sensor is a conventional device that is commercially available, and detects the concentration of carbon dioxide from the amount of light that has not been absorbed by applying light of a wavelength that is easily absorbed by carbon dioxide to a measurement target. The concentration measuring unit 11 measures the concentration of carbon dioxide at a predetermined time interval (for example, every 15 seconds), and notifies the calculation unit 12 of the measurement result as needed.

  The calculation unit 12 can be configured by a general microcomputer or the like, and includes a CPU 121, a ROM 122, a RAM 123, and the like as shown in FIG. The calculation unit 12 is a part that calculates the ventilation amount and the number of people in the room estimated by the above-described ventilation amount estimation device 1 using the measurement result of the concentration measurement unit 11. The details of the ventilation amount and occupancy estimation processing performed by the calculation unit 12 and the preparation (calibration) for that will be described later. The ROM 122 stores a program and data indicating the procedure of the above process, and the CPU 121 executes each process according to the program stored in the ROM 122. The RAM 123 temporarily holds data and the like necessary for the above process.

  Next, the operation unit 13 is an interface with the user of the ventilation amount estimation device 1, and when the user inputs each parameter value necessary for the processing in the calculation unit 12, or the processing result in the calculation unit 12. That is, it is used when displaying the estimated ventilation amount, the number of people in the room, and the like to the user. As shown in FIG. 2, the operation unit 13 includes a display panel 131 and operation buttons 132, which are used for display to the user and input by the user, respectively.

  The I / F unit 14 is a part that controls an interface between the ventilation amount estimation device 1 and the outside. Here, communication with the environment information server 3 described above is performed via the I / F unit 14. Specifically, the ventilation amount and the estimation result of the number of people in the ventilation amount estimation device 1 and the measurement result of the carbon dioxide concentration are transmitted to the environment information server 3, and if necessary, from the environment information server 3 Parameter values necessary for the estimation process are transmitted to the ventilation amount estimation device 1 and set in the RAM 123 or the like.

  The environment information acquisition system 100 according to the present embodiment having the above-described configuration is characterized in the ventilation amount and the number of people in the room estimation process performed by the ventilation amount estimation device 1. explain.

First, calculation formulas used for estimating the ventilation amount and the number of people in the room will be described. FIG. 3 is a diagram for explaining the relationship between the pollutant concentration in the room and the ventilation amount. In the diagram shown in FIG. 3, the rectangular closed space is the estimation target room 2, the ventilation amount of the room is Q (m ³ / h), and the indoor pollutant concentration (in this embodiment example) CO ₂ concentration) is C (ppm). The pollutant concentration outside the room 2 (CO ₂ concentration) is C _{2 O} (ppm), and the amount of indoor pollutant (CO ₂ ) generation is M (m ³ / h). The capacity of the room is represented by V (m ³ ).

  The state shown in FIG. 3 shows a general state in the room 2 in which ventilation is performed, and outflow from the room 2 from the contaminated mass flowing into (added to) the room 2 within a predetermined time (dt). Since the result obtained by subtracting the contaminated mass is the contaminated mass accumulated in the room 2, the following equation (1) holds.

(C _O Qdt + Mdt) −CQdt = VdC (1)
When the above (1) is sequentially changed, the following equation (2) can be obtained.

^{_{C = C O + (C S}} -C O) e -Qt / V + (1-e -Qt / V) M / Q (2)
Here, _CS is the indoor pollutant initial concentration (ppm), and t is the elapsed time (h) from the time when the pollutant initial concentration _CS is measured to the time when the pollutant concentration C is measured.

In the present embodiment, the number of people in the room 2 is pollutant, that is, the source of CO ₂ , so the number of people in the room is n (person) and the amount of CO ₂ generated per person is If k (m ³ / (h · people)), then M = kn, and the above equation (2) becomes the following equation (3).

^{_{C = C O + (C S}} -C O) e -Qt / V + (1-e -Qt / V) kn / Q (3)
In the present ventilation amount estimation device 1, the ventilation amount and the number of people in the room are estimated using the equation (3).

FIG. 4 is a flowchart illustrating the procedure of the estimation process performed by the ventilation amount estimation apparatus 1. The ventilation amount estimation device 1 is relatively small and is manually brought into the target room 2 and installed. Then, in order to perform the estimation calculation by the above-described equation (3), a known parameter value is set (step S1). Specifically, the capacity of the room V, CO ₂ generation amount k per person, and each value of the external CO ₂ concentration _{C O} is located at a predetermined position of the RAM123 such ventilation quantity estimation apparatus 1.

Each of these parameter values can be set by the user through the operation unit 13 or set via the network from the environment information server 3, but the CO ₂ generation amount per person k and the external CO 2 About ₂ density | concentration _CO , you may set to the ventilation quantity estimation apparatus 1 beforehand as a substantially constant value. Also, an external CO ₂ concentration C _O is the number of people is the CO ₂ concentration in the steady state of 0, may be set from the measurement results of the concentration measuring unit 11 for aforementioned of the ventilation quantity estimation apparatus 1 .

FIG. 5 is a diagram illustrating an example of a measurement result of the concentration measurement unit 11. In the graph shown in FIG. 5, the horizontal axis is time t, and the vertical axis is the measured CO ₂ concentration. The portion that is the mountain at the center of the graph is a time zone where there are people in the room and therefore CO ₂ is generated. On the other hand, the portions on both sides (a and b in the figure) are night time periods or early morning time periods when no occupants are present. Therefore, the concentration measured in the time zone a or b can be set to C 2 _O , and the calculation unit 12 calculates C 2 _{O according} to the measurement result notified from the concentration measurement unit 11 in the time zone a or b. You may make it set. In addition, since it is determined that it is a time zone when there is no occupant as in a or b, the measured values are notified from the concentration measurement unit 11 at predetermined time intervals (for example, 15 seconds) after the installation. Can be determined to be in the relevant time zone when the value of is changing below a predetermined low value. Moreover, the time zone when there is no occupant may be set in advance as an absolute time, for example, from 11 pm to 5 am.

It is also possible to set the value of C _O receives the measured value of the CO ₂ sensor mounted on the outside of the room 2.

Next, the calculation part 12 of the ventilation quantity estimation apparatus 1 determines the time slot | zone (period) when the occupancy number n becomes known (step S2). In the above (3), the indoor CO ₂ concentration C of the indoor CO ₂ concentration C _S and end time in the start time of the time t, as described above, the value by the notification of periodic measurements from density measurement unit 11 it can be known, also, as described above, the capacity of the room V, CO ₂ generation amount k per capita, and since the values of the external CO ₂ concentration C _O is set, at this point, the value is unknown Important parameters are the number of people in the room n and the ventilation rate Q.

Therefore, in the time zone in which the number of people n in the room 2 is known, only the ventilation amount Q is unknown in the above equation (3), that is, the measured CO ₂ concentration in this time zone is applied to the equation (3). Thus, the ventilation amount Q can be calculated.

  The time zone can be determined by various methods. First, there is a method in which the user inputs the time zone. In this case, the user grasps the number of people in the room 2, inputs the time zone of the number of people and information on the number of people from the operation unit 13 or the environment information server 3, and the calculation unit 12 inputs these information. The above decision is made based on information.

In addition, the number of people in the room becomes 0 after the last person leaving the room 2 leaves, and the number of people in the room becomes 1 after the first person enters the room. A time zone may be determined. In the case of the change in the CO ₂ concentration as shown in FIG. 5 described above, the time zone in which the occupant becomes 0 after the final exit has left corresponds to the time zone indicated by T2 in FIG. The time zone in which the number of people in the room becomes 1 after the first guest enters the room corresponds to the time zone indicated by T1 in FIG. Therefore, based on the measurement value from the concentration measurement unit 11 notified at any time, the calculation unit 12 can extract a portion showing such a change and determine the time zone. That can be done CO ₂ concentration measurements to be notified, a time zone rises from near the value of C _O being set, or, the decision by extracting the time zone which falls to near the value of C _O .

  In addition, since it is possible to grasp the fact that the last evacuee has exited by other acts such as turning off the lights in the room 2, for example, a signal that the lights have been turned off is displayed. If the occupant can receive the signal, the time when the calculation unit 12 receives the signal can be determined as the time when the occupant becomes 0, and the time period can be determined. The same can be done when the first person entering the room grasps that it has entered the room.

Next, the calculating part 12 calculates the ventilation amount Q in the determined time zone, and estimates the ventilation amount Q of the room 2 (step S3). As described above, in the time zone in which the number of people in the room is known, only the ventilation amount Q is unknown in the above equation (3), so the calculation unit 12 notifies the CO ₂ concentration value measured by the concentration measurement unit 11. The ventilation amount Q is calculated using the above equation (3) at the timing of coming (for example, every 15 seconds). Specifically, a notification interval (for example, 15 seconds) from the concentration measuring unit 11 is set as a time t, a CO ₂ concentration value notified at the end of the time t is set as a C value, and the notification is made immediately before. It has been, i.e., determine the Q at the time t the notified CO ₂ concentration value at the beginning of the time t as the value of C _S.

  The calculation unit 12 repeatedly executes the calculation of Q at each time t for the determined time period, obtains an average value of the calculated Q, and uses the obtained average value as the ventilation amount of the room 2. To do. Note that the time zone in which the number of people in the room n is known does not have to be one, and a time zone in which n is different may be used. For example, the user monitors the room 2 for a certain period, inputs the occupancy number n to the ventilation amount estimation device 1 every time the occupancy changes, and sets the certain period as the determined time zone. The ventilation amount Q can be obtained from the period.

Next, the ventilation amount estimation device 1 starts estimating the number of people n in the room using the estimated ventilation amount Q. Specifically, the calculation unit 12 first sets the ventilation amount Q obtained as the average value to the value of Q in the equation (3). Thus, in addition to the parameter value set in step S1, the unknowns are C, C _S , t, and the number of people in the room n in the equation (3). Here, t is the notification interval (for example, 15 seconds) of the measurement result from the concentration measuring unit 11 described above, and therefore the CO ₂ concentration values notified before and after the interval are _CS and C. Therefore, in Equation (3), the unknown number is only the number of people n in the room, and the calculation unit 12 calculates the number of people n in the room by applying the CO ₂ concentration value notified in Equation (3) at each notification interval. (Step S4).

  In this process, the number of people n in the room is obtained for each notification interval, and this process is sequentially continued. If the notification interval is as short as 15 seconds, for example, the number of people in the plurality of notification intervals is n is obtained as an average value of n obtained at each notification interval, and the value is defined as n in the room.

When the occupancy number n of the room 2 is estimated in this way, the ventilation amount estimation device 1 outputs the estimated ventilation amount Q and the occupancy number n (step S5). Specifically, as described above, the measured values of the ventilation amount Q, the number of people n in the room, and the CO ₂ concentration are transmitted to the environment information server 3 via the network 4. Further, these values are displayed on the display panel 131 of the operation unit 13 as necessary. The output timing of these values can be arbitrarily set. For example, the ventilation amount Q can be output when the estimation is completed.

  As described above, the ventilation amount and the number of people in the room are estimated in the ventilation amount estimation apparatus 1. The amount of ventilation Q is estimated appropriately after the number of people in the room is estimated. May be performed for value review. Ventilation volume in the room varies somewhat depending on temperature, humidity, etc. even if the air-conditioning equipment and the room configuration are the same. In order to estimate the number of people in the room more accurately, ventilation is appropriate for each season. It is desirable to review the quantity Q.

  Thus, when the estimation result in the ventilation amount estimation apparatus 1 of each room 2 is transmitted to the environment information server 3, such information is held available and used for air conditioning control of each room 2. . For example, since the number of people in each room 2 is grasped, it is effectively used when optimal air conditioning control is performed for a plurality of rooms as a whole.

Next, a verification result of estimation using the present ventilation amount estimation device 1 will be described. FIG. 6 is a graph showing the measured value of the CO ₂ concentration in the room used in the verification experiment and the CO ₂ concentration value based on the estimation formula used in the ventilation amount estimation device 1 in time series. The measured CO ₂ concentration indicated by a wide line in FIG. 6 is a measured value of the CO ₂ concentration, and the value has a width because it represents the measurement error of the CO ₂ sensor.

On the other hand, the estimated CO ₂ concentration line in FIG. 6 is obtained by plotting the CO ₂ concentration C obtained at the predetermined time interval t by the above equation (3). Here, the number of people in FIG. 6 is the actual number of people n in the room. The estimated CO ₂ concentration is expressed by the following equation (3): n in the period for obtaining C, external CO ₂ concentration C _O , which is a known number, room capacity V, and CO ₂ generation amount k per person , and CO ₂ concentration C _S of the previous period, is obtained determined by applying the previously assumed ventilation Q. Here, the ventilation volume Q is set so that the level of the measured CO ₂ concentration and the estimated CO ₂ concentration are generally matched, and a constant value was used in the time zone of the experiment.

As can be seen from FIG. 6, the estimated CO ₂ concentration almost coincides with the measured CO ₂ concentration at any time in the experimental time zone. Specifically, 83.3% of the estimated CO ₂ concentration is an error. It was within the line of measured CO ₂ concentration considering the range. This result shows that the setting of the ventilation rate Q is correct in each time zone where the occupancy number n is different, and it can be treated from the experiment that the value of the ventilation rate Q can be treated as almost constant regardless of the occupancy number n. I can say that. Therefore, it can be said that it is appropriate to estimate the ventilation amount Q in step S3 of FIG. 4, that is, to set Q at a predetermined n value as the ventilation amount of the room 2. In other words, it can be said that the method for estimating the ventilation amount Q has good accuracy.

In FIG. 6, the measured CO ₂ concentration does not take a value of 2000 ppm or more, and has a flat graph shape around 18:00, but this is because the measurement limit of the sensor used in the experiment is 2000 ppm. Therefore, more accurate measurement can be performed by using another sensor having a high measurement limit. Then, in that case, CO ₂ estimated concentration is considered likely to more consistent with CO ₂ measurement levels.

  Next, FIG. 7 is a graph in which the actual number of people in the room used in the verification experiment and the estimation result of the number of people in the room by the ventilation amount estimation device 1 are plotted. In both graphs of FIGS. 7A and 7B, the measurement value indicated by the bold line is the actual number of people in the room, and the estimation value indicated by the thin line is the estimation result. Both graphs (A) and (B) are obtained by changing the average period of n obtained as the average value described above.

  As is apparent from both graphs, the estimation result is in good agreement with the actual value, and it can be seen that the accuracy of estimation by the ventilation amount estimation device 1 is high.

  In the above-described embodiment, a plurality of ventilation amount estimation devices 1 are installed as the environment information acquisition system 100 and connected to the environment information server 3 via the network 4. It may be used alone. In this case, the above estimation result and measurement result can be output to the display panel 131.

In the above-described embodiment, the ventilation amount and the number of people in the room are estimated by each ventilation amount estimation device 1. However, the estimation information is collectively performed by the environment information server 3. Also good. In this case, each ventilation quantity estimation device 1 appropriately transmits the measured CO ₂ concentration value to the environment information server 3.

In this embodiment, the indoor pollutant is CO ₂ , but the same ventilation amount estimation can be performed using the concentrations of other substances. In this case, the above (2) is used. For example, if the generation amount of a chemical substance generated in a room is substantially constant, the ventilation amount can be calculated using a measurement value of the chemical substance by a concentration sensor. It is also possible to estimate the ventilation volume and the number of people in the room using O ₂ instead of CO ₂ . In this case, an O ₂ concentration sensor is used as the concentration measuring unit 11, and the CO ₂ generation amount k per person in the above equation (3) is negative for this parameter as the O ₂ absorption amount (consumption amount) per person. To give the value of.

Further, the ventilation amount estimated by the ventilation amount estimation device 1 according to the present embodiment can be used not only for estimating the number of people in the room but also for other purposes. For example, when the harmful gas concentration in a room becomes high, the time from when the harmful gas source is shut off until the allowable concentration is reached is the value obtained by estimating the ventilation rate Q in the above equation (2). And the generation amount M is 0, the gas concentration at that time is C _S , and the allowable concentration value is C, and can be estimated by obtaining the time t. Similarly, if the dust concentration can be measured, the time until the dust concentration becomes a predetermined value or less can be estimated.

As described above, in the ventilation amount estimation apparatus 1 according to the present embodiment, it is possible to estimate the ventilation amount with high accuracy from the change in the indoor pollutant concentration using the above-described estimation formula. For this purpose, a small device equipped with a densitometer and a microcomputer may be installed in the room, and the amount of ventilation can be estimated easily and inexpensively. Furthermore, since the parameter (C _O , n) value necessary for performing the estimation can be automatically set based on the measurement result of the densitometer provided by itself, the estimation process can be easily performed in this respect as well. Can do.

  Furthermore, in the present ventilation amount estimation device 1, it is possible to estimate the number of people in the room with high accuracy by the above estimation formula using the estimated ventilation amount. Also in this case, it is only necessary to have a measured value by a densitometer, and the number of people in the room can be easily estimated. In addition, it is possible to estimate the number of people in the room with higher accuracy by reestimating the ventilation amount every season or the like.

  Further, as in the environment information acquisition system 100 according to the present embodiment, information such as the ventilation amount and the number of people in the room acquired by the ventilation amount estimation device 1 in a plurality of rooms is collected and held in a server. Thus, information such as the estimated ventilation volume can be effectively used in an air conditioning control device or the like for optimally controlling the entire plurality of rooms.

  The protection scope of the present invention is not limited to the above-described embodiment, but covers the invention described in the claims and equivalents thereof.

It is a lineblock diagram concerning this example of an embodiment of an environment information acquisition system using a ventilation quantity estimating device to which the present invention is applied. It is a block diagram concerning this example of an embodiment of ventilation quantity estimating device 1. It is a figure for demonstrating the relationship between the pollutant density | concentration of a room, and the ventilation rate. It is the flowchart which illustrated the procedure of the estimation process by the ventilation amount estimation apparatus. It is the figure which showed an example of the measurement result of the density | concentration measurement part. Is a graph showing the CO ₂ concentration levels of the measurement value and the ventilation quantity estimation apparatus estimating equation using one of the CO ₂ concentration of the room used in the verification experiment in time series. It is the graph which plotted the actual number of people in the room used in verification experiment, and the estimation result of the number of people in the room by this ventilation quantity estimating device 1.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 Ventilation amount estimation apparatus, 2 rooms, 3 Environment information server, 4 Network, 11 Concentration measurement part (pollutant concentration measurement means), 12 Computation part (calculation means), 13 Operation part, 14 I / F part, 100 Environmental information Acquisition system, 121 CPU, 122 ROM, 123 RAM, 131 display panel, 132 operation buttons

Claims (6)

A ventilation amount estimation device for estimating a ventilation amount in a predetermined closed space,
A pollutant concentration measuring means installed in the predetermined closed space for measuring the concentration of the predetermined pollutant;
The concentration of the pollutant in the closed space at the first time considers the ventilation amount in the closed space, the influence from the concentration of the pollutant at the second time before the first time, and the pollution in the closed space. The relational expression expressed based on the influence from the generation of the quality, the concentration of the predetermined pollutant at two different times measured by the pollutant concentration measuring means in the time zone in which the generation amount of the predetermined pollutant is known Substituting for the concentration at the first time and the second time, and calculating means for calculating the ventilation amount. In claim 1,
The said calculating means calculates | requires the said ventilation volume about several different periods, and makes the average value of the calculated | required several said ventilation volume into the ventilation volume in the said predetermined closed space. The ventilation volume estimation apparatus characterized by the above-mentioned. In claim 1 or claim 2,
The calculation means determines a time zone in which the pollutant generation amount is known based on a change in the concentration of the predetermined pollutant measured by the pollutant concentration measurement means. apparatus. In any one of Claims 1 thru | or 3,
The predetermined pollutant is carbon dioxide;
The predetermined amount of pollutant generation source is a person existing in the predetermined closed space. In claim 4,
The computing means further applies the obtained ventilation amount to the relational expression, and calculates the concentration of the predetermined contaminant at two different times measured by the contaminant concentration measuring means as the first time. Substituting as the concentration at the second time, the number of persons existing in the predetermined closed space is obtained. A ventilation amount estimation method for estimating a ventilation amount in a predetermined closed space,
Measuring the concentration of the predetermined pollutant by the pollutant concentration measuring means installed in the predetermined closed space;
The concentration of the pollutant in the closed space at the first time considers the ventilation amount in the closed space, the influence from the concentration of the pollutant at the second time before the first time, and the pollution in the closed space. The relational expression expressed based on the influence from the generation of the quality, the concentration of the predetermined pollutant at two different times measured by the pollutant concentration measuring means in the time zone in which the generation amount of the predetermined pollutant is known Substituting as the concentrations of the first time and the second time, and determining the ventilation amount.