Carbon dioxide concentration measurement sensor calibration system, system control device for carbon dioxide concentration measurement sensor calibration system, and carbon dioxide concentration measurement sensor calibration method

Abstract

A system control device (40) comprises: a timing unit (43) that measures time; a calibration information generation unit (45) that generates calibration information for a plurality of slave CO2 sensor values; and a ventilation control unit (44) that generates a ventilation control command for causing a plurality of ventilation mechanisms to perform forced ventilation. Upon detecting that the time for forced ventilation has been reached, the timing unit (43) provides notification to the ventilation control unit (44). The ventilation control unit (44) generates a ventilation control signal in response to the notification of forced ventilation, and outputs the ventilation control signal to a plurality of ventilation mechanisms (61-64). The plurality ventilation mechanisms (61-64) perform forced ventilation on the basis of the ventilation control signal. The calibration information generation unit (45) generates the calibration information on the basis of the plurality of slave CO2 sensor values and a master CO2 sensor value acquired during a calibration reference acquisition period (Trc) set after forced ventilation.

Description

[Technical Field]

[0001] The present invention relates to a technique for calibrating a carbon dioxide concentration measurement sensor. [Background technology]

[0002] A central air-conditioning system is described in Patent Document 1. The central air-conditioning system of Patent Document 1 has an air quality sensor disposed in each of a plurality of rooms.

[0003] The multiple air quality sensors measure the carbon dioxide concentration and other parameters of the rooms in which they are located. The central air conditioning system performs air conditioning based on the sensor values ​​detected by the multiple air quality sensors. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Publication No. 2022-010779 Summary of the Invention [Problem to be solved by the invention]

[0005] In an air conditioning control system that uses multiple sensors to control air conditioning, such as that shown in Patent Document 1, air conditioning may be performed based on the carbon dioxide concentration in each room. For example, when the carbon dioxide concentration in a room exceeds a ventilation threshold, the air conditioning control system may perform forced ventilation or send a notification urging ventilation.

[0006] In such cases, the accuracy of the sensor values ​​(CO2 measurement values) of multiple carbon dioxide concentration measurement sensors (CO2 sensors) becomes important. Generally, CO2 sensors are classified into high-precision CO2 sensors that have a calibration function within the device, and general-purpose CO2 sensors that do not have a calibration function within the device. High-precision CO2 sensors can continuously output highly accurate CO2 measurement values, but are expensive. On the other hand, general-purpose CO2 sensors are inexpensive, but cannot continuously output highly accurate CO2 measurement values.

[0007] In a system using multiple sensors as described above, if all CO2 sensors are high-precision CO2 sensors, highly accurate CO2 measurements can be obtained continuously, but this will result in a significant increase in costs.On the other hand, if all CO2 sensors are general-purpose CO2 sensors, the increase in costs can be avoided, but highly accurate CO2 measurements cannot be obtained continuously.

[0008] Therefore, an object of the present invention is to provide a calibration system for carbon dioxide concentration measurement sensors that enables the continuous acquisition of highly accurate CO2 measurement values ​​using multiple CO2 sensors while minimizing increases in the cost of the air conditioning system. [Means for solving the problem]

[0009] The carbon dioxide concentration measurement sensor calibration system of this invention includes a master sensor, multiple slave sensors, and multiple ventilation mechanisms. The master sensor is installed in a reference environment in a building having multiple rooms to be measured, where the carbon dioxide concentration is more stable than the multiple rooms, and measures the carbon dioxide concentration of the reference environment with high accuracy and outputs the master CO2 sensor value. The multiple slave sensors, which have lower carbon dioxide concentration measurement accuracy than the master sensor, are installed in each of the multiple rooms, measure the carbon dioxide concentration in each room, and output the slave CO2 sensor value to each. The system control device calibrates the multiple slave CO2 sensor values ​​based on the master CO2 sensor value. The multiple ventilation mechanisms ventilate the multiple rooms.

[0010] The system control device includes a timer unit that keeps time, a calibration information generator that generates calibration information for the multiple slave CO2 sensor values, and a ventilation controller that generates ventilation control commands to cause the multiple ventilation mechanisms to perform forced ventilation. When the timer unit detects that the time for forced ventilation has arrived, it notifies the ventilation controller. In response to the forced ventilation notification, the ventilation controller generates a ventilation control signal and outputs it to the multiple ventilation mechanisms. The multiple ventilation mechanisms perform forced ventilation based on the ventilation control signal. The calibration information generator generates calibration information based on the master CO2 sensor value and the multiple slave CO2 sensor values ​​acquired during a calibration reference acquisition period set after the forced ventilation.

[0011] In this configuration, by forcibly ventilating multiple rooms, it is possible to forcibly create a period in which fluctuations in the CO2 concentration measurement values ​​(slave CO2 sensor values) due to factors such as human movement are small. This allows the calibration system to forcibly create timing for generating highly accurate calibration information. Furthermore, because slave sensors are cheaper than master sensors, such a calibration system can be constructed inexpensively.

[0012] The present invention also provides a calibration system for carbon dioxide concentration measurement sensors, comprising a master sensor, multiple slave sensors, a system control device, and multiple ventilation mechanisms. The master sensor is installed in a reference environment in a building having multiple rooms to be measured, where the carbon dioxide concentration is more stable than the multiple rooms. The master sensor measures the carbon dioxide concentration of the reference environment with high accuracy and outputs a master CO2 sensor value. The multiple slave sensors, each with lower carbon dioxide concentration measurement accuracy than the master sensor, are installed in each of the multiple rooms, measure the carbon dioxide concentration in each room, and output a slave CO2 sensor value to each. The system control device calibrates the multiple slave CO2 sensor values ​​based on the master CO2 sensor value. The multiple ventilation mechanisms ventilate the multiple rooms.

[0013] The system control device includes a calibration information generation unit that generates calibration information for multiple slave CO2 sensor values, a ventilation control unit that generates ventilation control commands to cause multiple ventilation mechanisms to perform forced ventilation, and a power consumption prediction unit that predicts the power consumption of the building.

[0014] When the power consumption prediction unit predicts that there will be a power surplus over a predetermined period of time, it notifies the ventilation control unit. The ventilation control unit generates a ventilation control signal in response to the forced ventilation notification and outputs it to multiple ventilation mechanisms. The multiple ventilation mechanisms perform forced ventilation based on the ventilation control signal. The calibration information generation unit generates calibration information based on the master CO2 sensor value and multiple slave CO2 sensor values ​​acquired during a calibration reference acquisition period set after the forced ventilation.

[0015] In this configuration, by performing forced ventilation in multiple rooms, it is possible to forcibly create a period in which fluctuations in CO2 concentration measurements (slave CO2 sensor values) due to factors such as human movement are small. This allows the calibration system to forcibly create timing for generating highly accurate calibration information. Furthermore, since slave sensors are cheaper than master sensors, such a calibration system can be configured inexpensively. Furthermore, with this configuration, air conditioning control during and after forced ventilation can be controlled so that the contract power threshold is not exceeded. This also helps to prevent indirect increases in costs. [Effects of the Invention]

[0016] According to this invention, it is possible to continuously obtain highly accurate CO2 measurement values ​​using a plurality of CO2 sensors while suppressing increases in the cost of the air conditioning system. [Brief explanation of the drawings]

[0017] [Figure 1] FIG. 1 is a diagram showing an example of an air conditioning system including a calibration system for a carbon dioxide concentration measurement sensor according to a first embodiment of the present invention. [Figure 2] FIG. 2 is a functional block diagram showing an example of a system control device according to the first embodiment of the present invention. [Figure 3] FIG. 3 is a diagram showing an example of the forced ventilation start timing, the forced ventilation end timing, and the calibration reference acquisition period, as well as an example of the master CO2 concentration (master CO2 sensor value) and the slave CO2 concentration (slave CO2 sensor value). [Figure 4] FIG. 4 is a graph showing an example of a change in the value of the slave CO2 sensor over time. [Figure 5] FIG. 5 is a flowchart showing a first example of a calibration flow according to the first embodiment. [Figure 6] FIG. 6 is a flowchart showing a second example of the calibration flow according to the first embodiment. [Figure 7] FIG. 7 is a diagram showing an example of the configuration of a system control device in a calibration system for a carbon dioxide concentration measurement sensor according to the second embodiment of the present invention. [Figure 8] FIG. 8 is a flowchart showing an example of a calibration flow according to the second embodiment. [Figure 9] FIG. 9 is a diagram showing an example of an air conditioning system including a calibration system for a carbon dioxide concentration measurement sensor according to the third embodiment of the present invention. [Figure 10] FIG. 10 is a diagram showing an example of the configuration of a system control device according to the third embodiment of the present invention. [Figure 11] FIG. 11 is a diagram showing an example of the transition of daily power consumption by season. [Figure 12] FIG. 12 is a diagram showing an example of an air conditioning system including a calibration system for a carbon dioxide concentration measurement sensor according to the fourth embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0018] [First embodiment] A calibration system for a carbon dioxide concentration measurement sensor according to a first embodiment of the present invention will be described with reference to the drawings. Fig. 1 is a diagram showing an example of an air conditioning system including a calibration system for a carbon dioxide concentration measurement sensor according to the first embodiment of the present invention. Note that, hereinafter, the carbon dioxide concentration will be referred to as CO2 concentration, and the carbon dioxide concentration measurement sensor will be referred to as a CO2 sensor.

[0019] As shown in FIG. 1, the air conditioning system includes a master CO 2 sensor 20, a plurality of slave CO 2 sensors 31-34, a system control device 40, a plurality of air conditioners 51-54, 59, a plurality of ventilation mechanisms 61-64, and a chiller 80.

[0020] The master CO2 sensor 20 is a sensor with a self-calibration function. For example, the master CO2 sensor 20 is a CO2 sensor using a single light source and two wavelengths. The multiple slave CO2 sensors 31-34 are sensors without the self-calibration function described above. For this reason, the master CO2 sensor 20 is more expensive than each of the multiple slave CO2 sensors 31-34.

[0021] The air conditioning system is installed in a building 90 that includes, for example, a plurality of rooms 91-94 and a machine room 99. The plurality of rooms 91-94 are rooms where people come and go, for example, during the daytime on weekdays, and where the CO2 concentration fluctuates greatly. The machine room 99 is a room where people usually do not come and go, and where the CO2 concentration fluctuates less than the plurality of rooms 91-94. Therefore, the environment inside the machine room 99 corresponds to the "reference environment" of the present invention. Note that the number of rooms in the building 90 is not limited to this.

[0022] A plurality of air conditioners 51-54, a plurality of slave CO2 sensors 31-34, and a plurality of ventilation mechanisms 61-64 are installed in a plurality of rooms 91-94, respectively. Specifically, the air conditioner 51, the slave CO2 sensor 31, and the ventilation mechanism 61 are installed in room 91, and the air conditioner 52, the slave CO2 sensor 32, and the ventilation mechanism 62 are installed in room 92. The air conditioner 53, the slave CO2 sensor 33, and the ventilation mechanism 63 are installed in room 93, and the air conditioner 54, the slave CO2 sensor 34, and the ventilation mechanism 64 are installed in room 94.

[0023] The air conditioner 59 and the master CO2 sensor 20 are installed in the machine room 99. The installation location of the master CO2 sensor 20 is not limited to the machine room 99, but may be any environment where fluctuations in CO2 concentration are smaller than those in the multiple rooms 91-94.

[0024] The plurality of air conditioners 51-54 and air conditioner 59 are connected to a chiller 80 installed on rooftop 901 of building 90. The air conditioning of building 90 is controlled by chiller 80, the plurality of air conditioners 51-54, and air conditioner 59.

[0025] The plurality of air conditioners 51-54 condition the respective plurality of rooms 91-94 in which they are installed. The air conditioner 59 conditions the air in the machine room 99.

[0026] The multiple slave CO2 sensors 31-34 measure the CO2 concentration in the multiple rooms 91-94 in which they are installed at a predetermined sampling period and output the slave CO2 sensor values. Specifically, the slave CO2 sensor 31 measures the CO2 concentration in room 91 and outputs the slave CO2 sensor value for room 91. The slave CO2 sensor 32 measures the CO2 concentration in room 92 and outputs the slave CO2 sensor value for room 92. The slave CO2 sensor 33 measures the CO2 concentration in room 93 and outputs the slave CO2 sensor value for room 93. The slave CO2 sensor 34 measures the CO2 concentration in room 94 and outputs the slave CO2 sensor value for room 94.

[0027] The master CO2 sensor 20 measures the CO2 concentration in the machinery room 99 at a predetermined sampling period and outputs a master CO2 sensor value.

[0028] The system control device 40 is installed at a predetermined location in the building 90. As an example, in the case of FIG.

[0029] The slave CO2 sensor values ​​measured by each of the plurality of slave CO2 sensors 31-34 are input to the system control device 40. The master CO2 sensor value is input to the system control device 40 from the master CO2 sensor 20.

[0030] The system controller 40 has a timing function and generates a forced ventilation command when it is time for forced ventilation and outputs it to the multiple ventilation mechanisms 61-64. After outputting the forced ventilation command, the system controller 40 calibrates the multiple slave CO2 sensor values ​​based on the master CO2 sensor value and the multiple slave CO2 sensor values ​​acquired during the calibration reference acquisition period. The system controller 40 outputs calibration information for each of the slave CO2 sensors 31-34 to each of the slave CO2 sensors 31-34.

[0031] The plurality of slave CO2 sensors 31-34 calibrate their respective slave CO2 sensor values ​​based on the calibration information.

[0032] By such calibration, the carbon dioxide concentration measurement sensor calibration system, which includes the master CO2 sensor 20, the plurality of slave CO2 sensors 31-34, and the system control device 40, can suppress measurement errors, including time-dependent errors, of the plurality of slave CO2 sensors 31-34.

[0033] Furthermore, an air conditioning system including a calibration system for carbon dioxide concentration measurement sensors can continuously measure the CO2 concentration in each of the rooms 91-94 with high accuracy without installing a high-accuracy CO2 sensor similar to the master CO2 sensor 20 in every room.

[0034] Furthermore, the calibration system for the carbon dioxide concentration measurement sensor can calibrate the slave CO2 sensors 31-34 at predetermined timings simply by measuring time. Therefore, the calibration system for the carbon dioxide concentration measurement sensor can calibrate the slave CO2 sensors 31-34 with a simple configuration.

[0035] (Specific Configuration Example of System Control Device 40 and Specific Calibration Method) Fig. 2 is a functional block diagram showing an example of a system control device according to the first embodiment of the present invention. As shown in Fig. 2, the system control device 40 includes an IF 41, a data storage unit 42, a timing unit 43, a ventilation control unit 44, and a calibration information generation unit 45. The system control device 40 is configured by a microcomputer or a computer device.

[0036] The IF 41 is an interface between the system control device 40 and an external device, and is connected to the master CO2 sensor 20 and the plurality of slave CO2 sensors 31-34.

[0037] The IF 41 acquires the master CO2 sensor value measured at a predetermined sampling period and the values ​​of a plurality of slave CO2 sensors measured at the same predetermined sampling period, and outputs them to the data storage unit 42.

[0038] The data storage unit 42 stores the master CO2 sensor value measured at a predetermined sampling period and the multiple slave CO2 sensor values ​​measured at the same predetermined sampling period. At this time, the data storage unit 42 stores the master CO2 sensor value and the multiple slave CO2 sensor values ​​with, for example, a timestamp so that the master CO2 sensor value and the multiple slave CO2 sensor values ​​measured at approximately the same timing can be identified.

[0039] The timer 43 keeps time, and when it detects that it is time for forced ventilation, it notifies the ventilation control unit 44 to start forced ventilation. The timer 43, together with the ventilation control unit 44, notifies the calibration information generation unit 45 to start forced ventilation.

[0040] The ventilation control unit 44 generates a ventilation control signal in response to the notification of the start of forced ventilation. The ventilation control unit 44 outputs the ventilation control signal to the multiple ventilation mechanisms 61-64. The multiple ventilation mechanisms 61-64 perform forced ventilation based on (triggered by) the ventilation control signal. At this time, the multiple ventilation mechanisms 61-64 perform forced ventilation for a preset period. The ventilation control unit 44 can specify the period for which forced ventilation is to be performed. When specified, the multiple ventilation mechanisms 61-64 perform forced ventilation for the specified period.

[0041] The calibration information generating unit 45 sets a calibration reference acquisition period after forced ventilation. Fig. 3 is a diagram showing an example of the start timing, end timing, and calibration reference acquisition period of forced ventilation, as well as an example of the master CO2 concentration (master CO2 sensor value) and slave CO2 concentration (slave CO2 sensor value).

[0042] The calibration information generating unit 45 determines the forced ventilation start time ts to be the timing when it receives a forced ventilation start notification from the timing unit 43. The calibration information generating unit 45 waits for a predetermined delay time Dyt based on the forced ventilation start time ts, and then sets a calibration reference acquisition period Trc having a predetermined length of time.

[0043] The length of the calibration reference acquisition period Trc is set to a length of time that allows for the acquisition of master CO2 sensor values ​​and slave CO2 sensor values ​​with a sampling number that allows for the generation of highly accurate calibration information. The end timing of the calibration reference acquisition period Trc is preferably set to a time earlier than the forced ventilation end time te, but is not limited to this.

[0044] The delay time Dyt can be omitted. However, by setting the delay time Dyt, the forced ventilation is performed sufficiently so that highly accurate calibration information can be generated. Therefore, as shown in FIG. 3, the calibration reference acquisition period Trc can be set for the period after the fluctuations in the slave CO2 sensor value have become small. This allows the calibration information generation unit 45 to more reliably generate highly accurate calibration information.

[0045] The calibration information generation unit 45 generates calibration information based on the master CO2 sensor value and multiple slave CO2 sensor values ​​acquired during the calibration reference acquisition period Trc. More specifically, the calibration information generation unit 45 reads the slave CO2 sensor value and master CO2 sensor value during the calibration reference acquisition period Trc from the data storage unit 42. The calibration information generation unit 45 generates calibration information based on the read slave CO2 sensor value and master CO2 sensor value.

[0046] Figure 4 is a graph showing an example of the change in the slave CO2 sensor value over time. As shown in Figure 4, a slave CO2 sensor without self-calibration function is affected more by the offset value than by the difference in CO2 concentration. In other words, whatever the CO2 concentration, there will be a certain difference (offset value) from the actual CO2 concentration.

[0047] Specifically, in the case of Figure 4, when the actual CO2 concentration (two-dot chain line) changes linearly, the slave CO2 sensor value also changes linearly, but has an offset value b. This offset value b changes over time and gradually increases.

[0048] On the other hand, the master CO2 sensor value reflects the actual CO2 concentration with high accuracy.

[0049] During the calibration reference acquisition period Trc, the rooms 91-94 are forcibly ventilated, resulting in CO concentrations approximately equal to those in the machine room 99 (reference environment). Therefore, if there is no offset value, the master CO sensor value and the slave CO sensor value will be approximately equal.

[0050] Therefore, it can be determined that the difference between the slave CO2 sensor value and the master CO2 sensor value corresponds to the offset value b due to deterioration of the slave CO2 sensor over time.

[0051] The calibration information generating unit 45 calculates the difference between the slave CO2 sensor value and the master CO2 sensor value at approximately the same timing during the calibration reference acquisition period Trc, and outputs this difference as calibration information.

[0052] The calibration information generating unit 45 calculates the difference between the slave CO2 sensor value of each of the plurality of slave CO2 sensors 31-34 and the master CO2 sensor value, and outputs calibration information for each of the plurality of slave CO2 sensors 31-34.

[0053] The IF 41 outputs calibration information for each of the plurality of slave CO2 sensors 31-34 to each of the plurality of slave CO2 sensors 31-34.

[0054] The plurality of slave CO2 sensors 31-34 calibrate their respective slave CO2 sensor values ​​based on the calibration information input thereto.

[0055] This makes it possible to continuously obtain highly accurate CO2 measurement values ​​for each of the multiple rooms 91-94 using the multiple slave CO2 sensors 31-34 while suppressing increases in the cost of the air conditioning system.

[0056] Furthermore, the system control device 40 can calibrate the CO2 measurement values ​​of the multiple slave CO2 sensors 31-34 with high accuracy by simply measuring time.

[0057] It is preferable to set the forced ventilation period to, for example, nighttime or long vacations. This prevents sudden ventilation during working hours. This prevents discomfort for people in the multiple rooms 91-94.

[0058] (Proofreading flow 1-1) 5 is a flowchart showing a first example of a calibration flow according to the first embodiment. Note that the specific content of each process shown in the flow has been explained in the description of the configuration above, and therefore the specific content will be omitted from the description of the flowchart.

[0059] The system controller 40 sequentially acquires the master CO2 sensor value and the slave CO2 sensor value (S11). The system controller 40 continues acquiring the master CO2 sensor value and the slave CO2 sensor value until the ventilation start time arrives (S12: NO).

[0060] When the ventilation start time arrives (S12 YES), the system controller 40 generates a ventilation control signal and outputs it to the plurality of ventilation mechanisms 61-64. The plurality of ventilation mechanisms 61-64 are triggered by the ventilation control signal to start forced ventilation of the plurality of rooms 91-94 (S13).

[0061] After the forced ventilation is started, the system control device 40 acquires the master CO2 sensor value and the multiple slave CO2 sensor values ​​for calibration during the calibration reference acquisition period Trc (S14).

[0062] The ventilation mechanisms 61-64 continue the forced ventilation until the ventilation end time arrives (S16: NO). When the ventilation end time arrives (S16: YES), the ventilation mechanisms 61-64 end the ventilation (S17).

[0063] The system control device 40 calibrates the slave CO2 sensor value based on the master CO2 sensor value and the multiple slave CO2 sensor values ​​acquired during the calibration reference acquisition period Trc (S15).

[0064] (Proofreading flow 1-2) Fig. 6 is a flowchart showing a second example of the calibration flow according to the first embodiment. The calibration flow of the second example shown in Fig. 6 differs from the calibration flow of the first example in that a wait based on the delay time Dyt is added. Only the differences will be described below.

[0065] After starting forced ventilation, the system controller 40 waits for acquisition of the calibration master CO2 sensor value and the multiple slave CO2 sensor values ​​based on the delay time Dyt (S130). After waiting, the system controller 40 acquires the calibration master CO2 sensor value and the multiple slave CO2 sensor values ​​during the calibration reference acquisition period Trc (S14).

[0066] [Second embodiment] A calibration system for a carbon dioxide concentration measurement sensor according to a second embodiment of the present invention will be described with reference to the drawings. Fig. 7 is a diagram showing an example of the configuration of a system control device in the calibration system for a carbon dioxide concentration measurement sensor according to the second embodiment of the present invention.

[0067] 7, the air conditioning system according to the second embodiment differs from the air conditioning system according to the first embodiment in that it includes a system control device 40A. Explanation of the similarities between the air conditioning system according to the second embodiment and the air conditioning system according to the first embodiment will be omitted.

[0068] The system control device 40A differs from the system control device 40 according to the first embodiment in that the timer unit 43 is replaced with a power consumption prediction unit 46. Other configurations of the system control device 40A are the same as those of the system control device 40, and a description of similar parts will be omitted.

[0069] The power consumption prediction unit 46 predicts the power consumption of the building 90. Specifically, for example, the power consumption prediction unit 46 predicts the future power consumption of the multiple air conditioners 51-54, 59 and compares the predicted power consumption with the contract power threshold. Note that at this time, it is preferable that the power consumption prediction unit 46 predicts not only the power consumption of the multiple air conditioners 51-54, 59 but also the power consumption of the entire building 90 and compares it with the contract power threshold. The contract power threshold is the maximum amount of power that the building 90 currently has a contract for with the electric power company.

[0070] The power consumption prediction unit 46 predicts that there is a power surplus if the predicted power consumption is below the contract power threshold. If the power consumption prediction unit 46 predicts that there is a power surplus for at least a period (length of time) that can ensure the calibration reference acquisition period Trc, it sets this period as the forced ventilation period. In this case, it is preferable that the power consumption prediction unit 46 predicts the forced ventilation period including the delay time Dyt until the CO2 concentration stabilizes.

[0071] The power consumption prediction unit 46 keeps time and notifies the ventilation control unit 44 when it is time to start the forced ventilation period. In response to this notification, the ventilation control unit 44 generates a ventilation control signal (start control signal) and outputs it to the multiple ventilation mechanisms 61-64. The multiple ventilation mechanisms 61-64 start forced ventilation based on the ventilation control signal (start control signal).

[0072] The power consumption prediction unit 46 keeps time and notifies the ventilation control unit 44 when the forced ventilation period ends. In response to this notification, the ventilation control unit 44 generates a ventilation control signal (end control signal) and outputs it to the multiple ventilation mechanisms 61-64. The multiple ventilation mechanisms 61-64 end the forced ventilation based on the ventilation control signal (end control signal).

[0073] After forced ventilation, the calibration information generation unit 45 acquires the master CO2 sensor value and the multiple slave CO2 sensor values ​​during at least the calibration reference acquisition period Trc. The calibration information generation unit 45 generates calibration information based on the acquired master CO2 sensor value and the multiple slave CO2 sensor values ​​during the calibration reference acquisition period Trc.

[0074] With this configuration, the calibration system according to the second embodiment can generate highly accurate calibration information and achieve an inexpensive configuration for the calibration system, similar to the first embodiment.

[0075] Furthermore, the calibration system according to the second embodiment can control air conditioning during and after forced ventilation to generate calibration information so that the contracted power threshold is not exceeded, thereby suppressing indirect increases in costs.

[0076] It is best to set the prediction period for the calibration system to nighttime or during long holidays. During nighttime and long holidays, there is likely to be a surplus in power consumption. Therefore, the calibration system can relatively easily set the forced ventilation period based on power consumption. Furthermore, setting the period to nighttime, especially in the summer, is better, as it helps reduce the load on the air conditioner when the air conditioning is restarted after forced ventilation.

[0077] (Proofreading flow 2) 8 is a flowchart showing an example of a calibration flow according to the second embodiment. Note that the specific content of each process shown in the flow has been explained in the description of the configuration above, and therefore will not be explained in the flowchart.

[0078] The system controller 40 sequentially acquires the master CO2 sensor value and the slave CO2 sensor value (S11). The system controller 40 predicts power consumption (S21). The system controller 40 sets the forced ventilation period to a period during which there is a margin for power consumption. The system controller 40 sets the start time and end time of the forced ventilation based on the set forced ventilation period.

[0079] When the ventilation start time arrives (S12 YES), the system controller 40 generates a ventilation control signal and outputs it to the plurality of ventilation mechanisms 61-64. The plurality of ventilation mechanisms 61-64 are triggered by the ventilation control signal to start forced ventilation of the plurality of rooms 91-94 (S13).

[0080] After the forced ventilation is started, the system control device 40 acquires the master CO2 sensor value and the multiple slave CO2 sensor values ​​for calibration during the calibration reference acquisition period Trc (S14).

[0081] The ventilation mechanisms 61-64 continue the forced ventilation until the ventilation end time arrives (S16: NO). When the ventilation end time arrives (S16: YES), the ventilation mechanisms 61-64 end the ventilation (S17).

[0082] The system control device 40 calibrates the slave CO2 sensor value based on the master CO2 sensor value and the multiple slave CO2 sensor values ​​acquired during the calibration reference acquisition period Trc (S15).

[0083] [Third embodiment] A calibration system for a carbon dioxide concentration measurement sensor according to a third embodiment of the present invention will be described with reference to the drawings. Fig. 9 is a diagram showing an example of an air conditioning system including the calibration system for a carbon dioxide concentration measurement sensor according to the third embodiment of the present invention. Fig. 10 is a diagram showing an example of the configuration of a system control device according to the third embodiment of the present invention.

[0084] 9 and 10, the calibration system for a carbon dioxide concentration measurement sensor according to the third embodiment differs from the calibration system for a carbon dioxide concentration measurement sensor according to the first embodiment in that it supplies power from a commercial power grid and power stored in a storage battery to a plurality of air conditioners to operate them, and in that it controls the plurality of air conditioners during forced ventilation. The other configurations and controls of the calibration system for a carbon dioxide concentration measurement sensor according to the third embodiment are the same as those of the calibration system for a carbon dioxide concentration measurement sensor according to the first embodiment, and a description of similar parts will be omitted.

[0085] As shown in Fig. 9, the calibration system for a carbon dioxide concentration measurement sensor according to the third embodiment includes a system control device 40B, a power control device 88, and a storage battery 89. Although Fig. 9 shows a state in which the power control device 88 and the storage battery 89 are installed on the roof of a building 90, the installation locations of the power control device 88 and the storage battery 89 are not limited to this.

[0086] The power control device 88 is connected to a storage battery 89 and also to a plurality of air conditioners (air conditioning devices) 51, 52, 53, 54, and 59.

[0087] During normal operation (when not calibrating the multiple slave CO2 sensors), the power control device 88 uses power from the commercial power system to supply operating power to the multiple air conditioners 51, 52, 53, 54, and 59. Furthermore, when there is excess power from the commercial power system, the power control device 88 charges the storage battery 89 with power from the commercial power system. Furthermore, when the power from the commercial power system is insufficient to cover the operating power of the multiple air conditioners 51, 52, 53, 54, and 59, the power control device 88 supplies auxiliary power from the storage battery 89 to the multiple air conditioners 51, 52, 53, 54, and 59.

[0088] The system control device 40B includes a timer unit 43B and an air conditioning control unit 47.

[0089] The timekeeping unit 43B determines the season of the day when forced ventilation will be performed, and sets the time period during which forced ventilation will be performed based on the determined season.

[0090] The timer 43B notifies the ventilation control units 44 and 47 of the forced ventilation time period.

[0091] The air conditioning control unit 47 notifies the power control device 88 to supply power supplemented by the storage battery 89 during the time period when forced ventilation is performed.

[0092] The ventilation control unit 44 generates a ventilation control signal in response to the notification of the forced ventilation time period and outputs it to the plurality of ventilation mechanisms 61-64.

[0093] Based on a notification from the air conditioning control unit 47, the power control device 88 supplies power to the plurality of air conditioners 51, 52, 53, 54, and 59 with assistance from the storage battery 89.

[0094] The ventilation mechanisms 61-64 perform forced ventilation based on the ventilation control signal.

[0095] Fig. 11 is a diagram showing an example of the change in daily power consumption by season. As shown in Fig. 11, the peak power consumption times differ between summer and winter.

[0096] Taking advantage of this feature, the calibration system performs forced ventilation outside of peak power hours depending on the season, allowing the system to perform forced ventilation during times of day when there is more leeway in power consumption.

[0097] This allows the calibration system to have more leeway in terms of power consumption for air conditioning when restoring the temperatures of multiple rooms that have changed due to forced ventilation for CO2 sensor calibration to the temperature before the forced ventilation, and when reducing temperature changes in the rooms during forced ventilation.

[0098] For example, as shown in Figure 11, in winter, peak power consumption (power demand) occurs in the morning (from around 8:00 to around 11:00) when heating usage is high, and during the period when lights are on (from around 17:00 to around 20:00). In winter, the time periods during which power consumption is high are longer than in summer. Furthermore, power consumption is higher in winter late at night and early in the morning than in summer.

[0099] The calibration system responds to this characteristic by setting the forced ventilation time period from 11:00 to 17:00. This allows the calibration system to perform forced ventilation outside of peak power consumption times, allowing for a margin of power for air conditioning control generated by forced ventilation.

[0100] Furthermore, the difference between the indoor and outdoor temperatures during the day is smaller in winter than in summer. Therefore, the temperature change caused by forced ventilation is smaller. This allows the calibration system to reduce the power used for air conditioning control and makes it easier to control the power so that the power received from the commercial power grid does not exceed the contract power threshold.

[0101] At this time, as shown in this embodiment, the calibration system can more reliably control power by utilizing the auxiliary power of the storage battery 89 so that the power received from the commercial power grid does not exceed the contract power threshold.

[0102] [Fourth embodiment] A calibration system for a carbon dioxide concentration measurement sensor according to a fourth embodiment of the present invention will be described with reference to the drawings. Fig. 12 is a diagram showing an example of an air conditioning system including the calibration system for a carbon dioxide concentration measurement sensor according to the fourth embodiment of the present invention.

[0103] 12, the calibration system for a carbon dioxide concentration measurement sensor according to the fourth embodiment differs from the calibration system for a carbon dioxide concentration measurement sensor according to the third embodiment in that it includes a system control device 40C and air conditioners 51C, 52C, 53C, and 54C. Note that other configurations of the calibration system for a carbon dioxide concentration measurement sensor according to the fourth embodiment are the same as those of the calibration system for a carbon dioxide concentration measurement sensor according to the third embodiment, and a description of similar parts will be omitted.

[0104] Each of the multiple air conditioners 51C, 52C, 53C, and 54C has the function of an air conditioner as well as the function of a ventilation mechanism. For example, air conditioner 51C has the function of air conditioner 51 of the above-described embodiment and the function of ventilation mechanism 61. Therefore, air conditioner 51C performs air conditioning and ventilation for room 91, and air conditioner 52C performs air conditioning and ventilation for room 92. Air conditioner 53C performs air conditioning and ventilation for room 93, and air conditioner 54C performs air conditioning and ventilation for room 94.

[0105] In FIG. 12, the air conditioner 59 does not have a ventilation mechanism, but the air conditioner 59 may also have a ventilation mechanism.

[0106] The system control device 40C has the same configuration as the system control device 40B, except that it outputs ventilation control signals to a plurality of air conditioners 51C, 52C, 53C, and 54C.

[0107] In this way, even if the air conditioning function and the ventilation function are integrated, it is possible to achieve the same effects as in a configuration in which the air conditioning function and the ventilation function are separate.

[0108] The configurations and processes of the above-described embodiments can be combined as appropriate, and effects corresponding to each combination can be achieved. [Explanation of symbols]

[0109] 20: Master CO2 sensor 31, 32, 33, 34: Slave CO2 sensors 40, 40A, 40B, 40C: System control device 41:IF 42: Data storage unit 43, 43B: Timing section 44: Ventilation control unit 45: Calibration information generation section 46: Power consumption prediction unit 47: Air conditioning control unit 51, 52, 53, 54, 51C, 52C, 53C, 54C, 59: Air conditioner 61, 62, 63, 64: Ventilation mechanism 80: Chiller 88: Power control device 89: Storage battery 90: Building 91-94: Living room 99: Machine room 901: Rooftop

Claims

1. a master sensor that is installed in a reference environment in a building having a plurality of rooms to be measured, the reference environment having a more stable carbon dioxide concentration than the plurality of rooms, the master sensor measuring the carbon dioxide concentration of the reference environment with high accuracy and outputting a master CO2 sensor value; a plurality of slave sensors each having a lower measurement accuracy of carbon dioxide concentration than the master sensor, each of which is installed in each of the plurality of rooms, each measuring the carbon dioxide concentration in each room and outputting a slave CO2 sensor value; a system controller for calibrating the slave CO2 sensor values ​​based on the master CO2 sensor value; a plurality of ventilation mechanisms for ventilating the plurality of rooms; Equipped with The system control device a timing unit that measures time; a calibration information generating unit that generates calibration information for the plurality of slave CO2 sensor values; a ventilation control unit that generates a ventilation control command to cause the plurality of ventilation mechanisms to perform forced ventilation; Equipped with When the timer detects that the time for the forced ventilation has arrived, it notifies the ventilation control unit; the ventilation control unit generates a ventilation control signal in response to the notification of forced ventilation and outputs the ventilation control signal to the plurality of ventilation mechanisms; the plurality of ventilation mechanisms perform the forced ventilation based on the ventilation control signal; The calibration information generation unit generates the calibration information based on the master CO2 sensor value and the plurality of slave CO2 sensor values ​​acquired during a calibration reference acquisition period set after the forced ventilation. Calibration system for carbon dioxide concentration measurement sensors.

2. a master sensor that is installed in a reference environment in a building having a plurality of rooms to be measured, the reference environment having a more stable carbon dioxide concentration than the plurality of rooms, the master sensor measuring the carbon dioxide concentration of the reference environment with high accuracy and outputting a master CO2 sensor value; a plurality of slave sensors each having a lower measurement accuracy of carbon dioxide concentration than the master sensor, each of which is installed in each of the plurality of rooms, each measuring the carbon dioxide concentration in each room and outputting a slave CO2 sensor value; a system controller for calibrating the slave CO2 sensor values ​​based on the master CO2 sensor value; a plurality of ventilation mechanisms for ventilating the plurality of rooms; Equipped with The system control device a calibration information generating unit that generates calibration information for the plurality of slave CO2 sensor values; a ventilation control unit that generates a ventilation control command to cause the plurality of ventilation mechanisms to perform forced ventilation; a power consumption prediction unit that predicts the power consumption of the building; Equipped with When the power consumption prediction unit predicts that there will be a surplus of power over a predetermined period in the future, it notifies the ventilation control unit of forced ventilation during this prediction period; the ventilation control unit generates a ventilation control signal in response to the notification of forced ventilation and outputs the ventilation control signal to the plurality of ventilation mechanisms; the plurality of ventilation mechanisms perform the forced ventilation based on the ventilation control signal; The calibration information generation unit generates the calibration information based on the master CO2 sensor value and the plurality of slave CO2 sensor values ​​acquired during a calibration reference acquisition period set after the forced ventilation. Calibration system for carbon dioxide concentration measurement sensors.

3. a master sensor that is installed in a reference environment in a building having a plurality of rooms to be measured, the reference environment having a more stable carbon dioxide concentration than the plurality of rooms, the master sensor measuring the carbon dioxide concentration of the reference environment with high accuracy and outputting a master CO2 sensor value; a plurality of slave sensors each having a lower measurement accuracy of carbon dioxide concentration than the master sensor, each of which is installed in each of the plurality of rooms, each measuring the carbon dioxide concentration in each room and outputting a slave CO2 sensor value; a system controller for calibrating the slave CO2 sensor values ​​based on the master CO2 sensor value; a plurality of ventilation mechanisms for ventilating the plurality of rooms; a plurality of air conditioners that condition the plurality of rooms; a power control device that controls power supply to the plurality of air conditioners; Equipped with The system control device a timing unit that measures time; an air conditioning control unit that issues instructions to the power control device regarding power supply to the plurality of air conditioners; a calibration information generating unit that generates calibration information for the plurality of slave CO2 sensor values; a ventilation control unit that generates a ventilation control command to cause the plurality of ventilation mechanisms to perform forced ventilation; Equipped with The timing unit Setting a time period for performing the forced ventilation based on the season, Notifying the ventilation control unit and the air conditioning control unit of the time period of the forced ventilation; the air conditioning control unit notifies the power control device to perform the power supply with assistance from a storage battery during the time period in which the forced ventilation is performed; the ventilation control unit generates a ventilation control signal in response to the notification of forced ventilation and outputs the ventilation control signal to the plurality of ventilation mechanisms; the power control device supplies power to the plurality of air conditioners using assistance from the storage battery; the plurality of ventilation mechanisms perform the forced ventilation based on the ventilation control signal; The calibration information generation unit generates the calibration information based on the master CO2 sensor value and the plurality of slave CO2 sensor values ​​acquired during a calibration reference acquisition period set after the forced ventilation. Calibration system for carbon dioxide concentration measurement sensors.

4. The plurality of air conditioning devices and the plurality of ventilation mechanisms are configured as integrated air conditioning devices integrated for each of the plurality of rooms. The calibration system for a carbon dioxide concentration measurement sensor according to claim 3.

5. a data acquisition unit that continuously acquires, over time, a master CO2 sensor value that measures with high accuracy the carbon dioxide concentration of a reference environment in which the carbon dioxide concentration is more stable than that of a living room, and a slave CO2 sensor value that measures the carbon dioxide concentration of the living room and has lower measurement accuracy than the master CO2 sensor value; a timing unit that measures time; a calibration information generating unit that generates calibration information for the plurality of slave CO2 sensor values; a ventilation control unit that generates a ventilation control command to perform forced ventilation in the plurality of rooms; Equipped with When the timer detects that the time for the forced ventilation has arrived, it notifies the ventilation control unit; the ventilation control unit generates a ventilation control signal in response to the notification of forced ventilation and outputs the ventilation control signal to the plurality of ventilation mechanisms; The calibration information generation unit generates the calibration information based on the master CO2 sensor value and the plurality of slave CO2 sensor values ​​acquired during a calibration reference acquisition period set after the forced ventilation. System control device for the calibration system of the carbon dioxide concentration measurement sensor.

6. a data acquisition unit that continuously acquires, over time, a master CO2 sensor value that measures with high accuracy the carbon dioxide concentration of a reference environment in which the carbon dioxide concentration is more stable than that of a living room, and a slave CO2 sensor value that measures the carbon dioxide concentration of the living room and has lower measurement accuracy than the master CO2 sensor value; a calibration information generating unit that generates calibration information for the plurality of slave CO2 sensor values; a ventilation control unit that generates a ventilation control command to perform forced ventilation in the plurality of rooms; a power consumption prediction unit that predicts power consumption of the building having the plurality of rooms; Equipped with When the power consumption prediction unit predicts that there will be a surplus of power over a predetermined period in the future, it notifies the ventilation control unit of forced ventilation during this prediction period; the ventilation control unit generates a ventilation control signal in response to the notification of forced ventilation and outputs the ventilation control signal to the plurality of ventilation mechanisms; The calibration information generation unit generates the calibration information based on the master CO2 sensor value and the plurality of slave CO2 sensor values ​​acquired during a calibration reference acquisition period set after the forced ventilation. System control device for the calibration system of the carbon dioxide concentration measurement sensor.

7. a data acquisition unit that continuously acquires, over time, a master CO2 sensor value that measures with high accuracy the carbon dioxide concentration of a reference environment in which the carbon dioxide concentration is more stable than that of a living room, and a slave CO2 sensor value that measures the carbon dioxide concentration of the living room and has lower measurement accuracy than the master CO2 sensor value; an air conditioning control unit that notifies a power control device that controls power supply to a plurality of air conditioners that perform air conditioning of the living room, regarding power control; a timing unit that measures time; a calibration information generating unit that generates calibration information for the plurality of slave CO2 sensor values; a ventilation control unit that generates a ventilation control command to perform forced ventilation in the plurality of rooms; Equipped with The timing unit Setting a time period for performing the forced ventilation based on the season, Notifying the ventilation control unit and the air conditioning control unit of the time period of the forced ventilation; the air conditioning control unit notifies the power control device to perform the power supply with assistance from a storage battery during the time period in which the forced ventilation is performed; the ventilation control unit generates a ventilation control signal in response to the notification of forced ventilation and outputs the ventilation control signal to the plurality of ventilation mechanisms; The calibration information generation unit generates the calibration information based on the master CO2 sensor value and the plurality of slave CO2 sensor values ​​acquired during a calibration reference acquisition period set after the forced ventilation. System control device for the calibration system of the carbon dioxide concentration measurement sensor.

8. a master sensor is installed in a reference environment in a building having a plurality of rooms to be measured, the reference environment having a more stable carbon dioxide concentration than the plurality of rooms, the master sensor measures the carbon dioxide concentration of the reference environment with high accuracy, and outputs a master CO2 sensor value; a plurality of slave sensors each having a lower accuracy of measuring a carbon dioxide concentration than the master sensor, each of which is installed in each of the plurality of rooms, each measuring a carbon dioxide concentration in each of the rooms and outputting a slave CO2 sensor value to each of the rooms; a system controller calibrating the slave CO2 sensor values ​​based on the master CO2 sensor value; A plurality of ventilation mechanisms ventilate the plurality of rooms. A method for calibrating a carbon dioxide concentration measurement sensor, comprising: the system control device generates a ventilation control signal when detecting that a time for forced ventilation has arrived and outputs the signal to the plurality of ventilation mechanisms; the plurality of ventilation mechanisms perform the forced ventilation based on the ventilation control signal; The system control device generates calibration information based on the master CO2 sensor value and the plurality of slave CO2 sensor values ​​acquired during a calibration reference acquisition period set after the forced ventilation. A method for calibrating a carbon dioxide concentration measurement sensor.

9. a master sensor is installed in a reference environment in a building having a plurality of rooms to be measured, the reference environment having a more stable carbon dioxide concentration than the plurality of rooms, the master sensor measures the carbon dioxide concentration of the reference environment with high accuracy, and outputs a master CO2 sensor value; a plurality of slave sensors each having a lower accuracy of measuring a carbon dioxide concentration than the master sensor, each of which is installed in each of the plurality of rooms, each measuring a carbon dioxide concentration in each of the rooms and outputting a slave CO2 sensor value to each of the rooms; a system controller calibrating the slave CO2 sensor values ​​based on the master CO2 sensor value; A plurality of ventilation mechanisms ventilate the plurality of rooms. A method for calibrating a carbon dioxide concentration measurement sensor, comprising: the system control device predicts that there will be a surplus of power over a predetermined period in the future, generates a ventilation control signal for performing forced ventilation during this predicted period, and outputs the signal to the plurality of ventilation mechanisms; the plurality of ventilation mechanisms perform the forced ventilation based on the ventilation control signal; The system control device generates calibration information based on the master CO2 sensor value and the plurality of slave CO2 sensor values ​​acquired during a calibration reference acquisition period set after the forced ventilation. A method for calibrating a carbon dioxide concentration measurement sensor.

10. a master sensor is installed in a reference environment in a building having a plurality of rooms to be measured, the reference environment having a more stable carbon dioxide concentration than the plurality of rooms, the master sensor measures the carbon dioxide concentration of the reference environment with high accuracy, and outputs a master CO2 sensor value; a plurality of slave sensors each having a lower accuracy of measuring a carbon dioxide concentration than the master sensor, each of which is installed in each of the plurality of rooms, each measuring a carbon dioxide concentration in each of the rooms and outputting a slave CO2 sensor value to each of the rooms; a system controller calibrating the slave CO2 sensor values ​​based on the master CO2 sensor value; a plurality of ventilation mechanisms for ventilating the plurality of rooms; A plurality of air conditioning devices condition the plurality of rooms, a power control device that controls the supply of power to the plurality of air conditioners; A method for calibrating a carbon dioxide concentration measurement sensor, comprising: The system control device Set the time period for forced ventilation based on the season, generating a ventilation control signal indicating a time period during which the forced ventilation is to be performed, and outputting the ventilation control signal to the plurality of ventilation mechanisms; notifying the power control device to supply power with assistance from a storage battery during the time period in which the forced ventilation is performed; The power control device supplies power to the plurality of air conditioners using the auxiliary power from the storage battery based on the notification, the plurality of ventilation mechanisms perform the forced ventilation based on the ventilation control signal; The system control device generates calibration information based on the master CO2 sensor value and the plurality of slave CO2 sensor values ​​acquired during a calibration reference acquisition period set after the forced ventilation. A method for calibrating a carbon dioxide concentration measurement sensor.

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