Ventilating and air conditioning control device, and ventilating and air conditioning control system

Abstract

A ventilating and air conditioning control device for controlling a ventilating and air conditioning control system having an air conditioning device that carries out air conditioning of a target space by adjusting a room temperature of the target space, and a ventilation device that ventilates the target space, the ventilating and air conditioning control device comprising: a control unit for performing a ventilating and air conditioning operation for operating the air conditioning device and the ventilation device; and a storage unit for storing an air conditioning schedule having a set temperature and a set time. In the ventilating and air conditioning operation during cooling, the control unit, after starting operation of the ventilation device at a first time, which is a time before the set time of the air conditioning schedule, determines an operation schedule for the air conditioning device for causing the room temperature of the target space to reach the set temperature at a second time, which is after the first time and before the set time, and operates the air conditioning device on the basis of the operation schedule.

Description

Ventilation and air conditioning control device and ventilation and air conditioning control system

[0001] The present invention relates to a ventilation and air conditioning control device and a ventilation and air conditioning control system that control a ventilation device and an air conditioner.

[0002] Conventionally, there is an air conditioning control device that controls an air conditioning device by starting the operation of the air conditioning device before a specified set time and controlling the temperature of the target space to reach a set temperature at the set time (see, for example, Patent Document 1).

[0003] Patent No. 7170740

[0004] The target space requires comfort not only in terms of room temperature but also in terms of ventilation, and the target space may be equipped with a ventilation device in addition to an indoor unit of an air conditioner. The air conditioning control device of Patent Document 1 does not take into consideration changes in room temperature when the ventilation device is operated to perform ventilation. Therefore, when a ventilation device is installed in the target space, the air conditioning control device of Patent Document 1 cannot respond to changes in room temperature due to ventilation, and there is a problem in that the room temperature of the target space may not reach the set temperature at the set time.

[0005] The present disclosure is intended to solve the above-mentioned problems, and aims to provide a ventilation and air conditioning control device and ventilation and air conditioning control system that can maintain an appropriate ventilation state in a target space and make the room temperature in the target space reach a set temperature at a set time.

[0006] The ventilation and air conditioning control device of the present disclosure is a ventilation and air conditioning control device that controls a ventilation and air conditioning control system having an air conditioner that adjusts the room temperature of a target space to air condition the target space, and a ventilation device that ventilates the target space, and is equipped with a control unit that performs ventilation and air conditioning operation to operate the air conditioner and ventilation device, and a memory unit that stores an air conditioning schedule having a set temperature and a set time, and in ventilation and air conditioning operation during cooling, the control unit starts operation of the ventilation device at a first time that is a time before the set time of the air conditioning schedule, and then at a second time that is after the first time and before the set time, determines an operation schedule for the air conditioner that will cause the room temperature of the target space to reach the set temperature at the set time, and operates the air conditioner based on the operation schedule.

[0007] The ventilation and air-conditioning control device according to the present disclosure is a ventilation and air-conditioning control system that controls an air conditioner that adjusts the room temperature of a target space to air-condition the target space, and a ventilation device that ventilates the target space, and includes a control unit that performs ventilation and air-conditioning operation to operate the air conditioner and the ventilation device, an air-conditioning schedule that has a set temperature and a set time, and a ventilation airflow rate and a target CO ２ and a storage unit that stores a ventilation schedule having a CO concentration in the target space at a first time, which is a time before the set time of the air conditioning schedule, during ventilation air conditioning operation during heating. ２ The concentration is set to the target CO ２ The ventilation start time, which is the time when the ventilation device starts operating to reach the CO concentration in the target space, is set as ２ concentration and target CO ２ The operation schedule is determined based on the concentration, ventilation air volume, and set time, and at a third time that is after the first time and before the set time, an operation schedule for the air conditioning unit is determined based on the room temperature of the target space, the set temperature, a temperature correction value resulting from the operation of the ventilation unit, and the ventilation start time, and after operating the air conditioning unit based on the operation schedule, control is performed to start the operation of the ventilation unit at the ventilation start time, and the operation schedule is a schedule that causes the room temperature of the target space to reach a temperature obtained by adding the temperature correction value to the set temperature at the ventilation start time.

[0008] The ventilation and air conditioning control system according to the present disclosure includes the above-described ventilation and air conditioning control device, a temperature detection device for detecting the room temperature of a target space, and a CO ２ CO concentration detection ２ The system includes a concentration detection device, a ventilation device, and an air conditioning device.

[0009] The ventilation and air conditioning control device and ventilation and air conditioning control system according to the present disclosure can maintain an appropriate ventilation state in a target space and can cause the room temperature in the target space to reach a set temperature at a set time.

[0010] 1 is an explanatory diagram of a usage form of a ventilation air-conditioning control system according to embodiment 1. FIG. 2 is a block diagram of the ventilation air-conditioning control system according to embodiment 1. FIG. 3 is a diagram showing an example of an air-conditioning schedule in the ventilation air-conditioning control system according to embodiment 1. FIG. 4 is a diagram showing an example of a ventilation schedule in the ventilation air-conditioning control system according to embodiment 1. FIG. 5 is a control flowchart (1 / 2) of the ventilation air-conditioning control system according to embodiment 1. FIG. 6 is a control flowchart (2 / 2) of the ventilation air-conditioning control system according to embodiment 1. FIG. 7 is an explanatory diagram of ventilation air-conditioning operation during cooling in the ventilation air-conditioning control system according to embodiment 1. FIG. 8 is an explanatory diagram of ventilation air-conditioning operation during heating in the ventilation air-conditioning control system according to embodiment 1. FIG. 9 is a control flowchart of the ventilation air-conditioning control system according to embodiment 2. FIG. 10 is a diagram showing an example of an operation log of the ventilation air-conditioning control system according to embodiment 2. FIG. 11 is an explanatory diagram of ventilation operation in the ventilation air-conditioning control system according to embodiment 2.

[0011] 1 is an explanatory diagram of a usage form of a ventilation air-conditioning control system 10 according to embodiment 1. The ventilation air-conditioning control system 10 of embodiment 1 includes a ventilation air-conditioning control device 1 and a CO ２ CO concentration detection ２ The apparatus includes a concentration detection device 2, a ventilation device 3 that ventilates the target space S, and an air conditioning device 4 that adjusts the room temperature of the target space S.

[0012] The ventilation and air conditioning control device 1 ２ This is a device that controls the ventilation device 3 based on the detection result of the concentration detection device 2. ２ The concentration detection device 2 is composed of a concentration detection sensor, and detects CO ２ The temperature detecting device 4a1 detects the concentration of ozone and transmits the detection results to the ventilation and air conditioning control device 1. The ventilation and air conditioning control device 1 is also a device that controls the air conditioner 4 based on the detection results of the temperature detecting device 4a1 that detects the room temperature in the target space S. The temperature detecting device 4a1 is made up of a temperature sensor, and is a device that detects the room temperature every certain time period (for example, every minute) and transmits the detection results to the ventilation and air conditioning control device 1. The temperature detecting device 4a1 is provided in the indoor unit 4a of the air conditioner 4.

[0013] The ventilation device 3 is a device capable of ventilating the target space S, and is equipped with an exhaust fan that exhausts air from the target space S to the outside of the target space S, and an intake fan that draws air from the outside of the target space S into the target space S. The configuration of the ventilation device 3 is not limited to a configuration equipped with an exhaust fan and an intake fan, and may be any device that is capable of ventilating a room. The ventilation device 3 is a device that can adjust the ventilation rate in two stages, weak and strong. The ventilation device 3 is not limited to a device that can adjust the ventilation rate in two stages, and may be a device that can adjust the ventilation rate in three or more stages.

[0014] The air conditioner 4 is a device that can adjust the room temperature of the target space S to condition the target space S. The air conditioner 4 performs at least one of cooling and heating of the target space S. The air conditioner 4 has an indoor unit 4a installed in the target space S and an outdoor unit 4b installed outside the target space S. The air conditioner 4 is a device that performs at least one of cooling and heating by performing a refrigeration cycle by circulating a refrigerant through a refrigerant circuit that includes a compressor, a condenser, a pressure reducing device, and an evaporator. Here, the air conditioner 4 will be described as a device that has a flow path switching device in the refrigerant circuit and performs both cooling and heating.

[0015] FIG. 2 is a block diagram of a ventilation and air-conditioning control system 10 according to the first embodiment. The ventilation and air-conditioning control device 1 includes a control unit 11, a storage unit 12, and an operation unit 13. The control unit 11 is configured with a microprocessor unit and includes a CPU, RAM, ROM, etc., and a control program, etc. is stored in the ROM. The control unit 11 controls the entire ventilation and air-conditioning control system 10 in accordance with the control program. The control unit 11 is not limited to a microprocessor unit. For example, the control unit 11 may be configured with updatable firmware, etc. Alternatively, the control unit 11 may be a program module that is executed in response to commands from a CPU, etc. (not shown).

[0016] The control unit 11 controls the air conditioners 4 and the ventilation devices 3 based on an air conditioning schedule and a ventilation schedule set by the user. The air conditioning schedule and the ventilation schedule are stored in the storage unit 12. The air conditioning schedule and the ventilation schedule will be described later.

[0017] The memory unit 12 stores an air conditioning schedule, a ventilation schedule, etc. The memory unit 12 includes a ROM, a RAM, etc. The operation unit 13 is a part where operation inputs from the user are made. The operation unit 13 is composed of, for example, buttons, a touch panel, a display panel, etc., and is a part that accepts instructions and operations from the user and outputs the contents of the instructions and operations to the control unit 11.

[0018] The ventilation and air conditioning control device 1 further ２ CO that communicates with the concentration detection device 2 ２ The CO meter includes an inter-device communication unit 14, a ventilation device communication unit 15 that communicates with the ventilation device 3, and an air conditioner communication unit 16 that communicates with the air conditioner 4. ２ The concentration detection device communication unit 14 and the CO ２ Communication 5a with the concentration detection device 2, communication 5b between the ventilation device communication unit 15 and the ventilation device 3, and communication 5c between the air conditioner communication unit 16 and the air conditioner 4 are performed wirelessly or via wire. The ventilation and air conditioning control device 1 is configured, for example, by being incorporated into a remote control or the like.

[0019] CO ２ The concentration detector 2 detects CO ２ CO sensor ２ Concentration detection unit 22 and CO ２ The detection result of the concentration detection unit 22 is input to the CO ２ and an inter-controller communication unit 21 that transmits the signal to the inter-concentration detection device communication unit 14. ２ Although the concentration detection device 2 is an independent device installed separately from the ventilation air-conditioning control device 1 and the ventilation device 3 in the example shown, it may also be installed in the ventilation air-conditioning control device 1 or the ventilation device 3. ２ The installation position of the concentration detecting device 2 is not particularly limited.

[0020] 3 is a diagram showing an example of an air conditioning schedule in the ventilation and air conditioning control system 10 according to Embodiment 1. The air conditioning schedule has a set temperature and a set time Ts. The set temperature is a target temperature for the room temperature of the target space S. The set time Ts is a target time for the room temperature of the target space S to reach the set temperature. The air conditioning schedule is set by the user by operating the operation unit 13, and is stored in the memory unit 12.

[0021] 4 is a diagram showing an example of a ventilation schedule in the ventilation air-conditioning control system 10 according to Embodiment 1. The ventilation schedule includes a start time Tst, an end time Tet, a ventilation air volume, and a target CO ２ The ventilation air volume is set to weak or strong here. When the ventilation air volume is weak, the rotation speed of the fan constituting the ventilation device 3 is set to be smaller than when the ventilation air volume is strong. When the ventilation air volume is strong, the rotation speed of the fan constituting the ventilation device 3 is set to be larger than when the ventilation air volume is weak. Target CO ２ The concentration is the CO ２ The ventilation schedule is set by the user through operation of the operation unit 13 and stored in the storage unit 12. Note that the start time Tst and end time Tet of the ventilation schedule are not used in the first embodiment but are used in the second embodiment.

[0022] The ventilation and air-conditioning control device 1 performs ventilation and air-conditioning operation to keep the target space S in an appropriate state and to operate the ventilation device 3 and the air conditioner 4 so that the room temperature reaches the set temperature at the set time Ts of the air-conditioning schedule. ２ The concentration is the target CO ２ This refers to a state in which the concentration is below 100 ppm. In ventilation / air-conditioning operation, different controls are performed during cooling and heating. Here, an overview of the control of ventilation / air-conditioning operation during cooling and ventilation / air-conditioning operation during heating will be explained.

[0023] (Ventilation air-conditioning operation during cooling) During cooling, hot air is trapped within the target space S. For this reason, during ventilation air-conditioning operation during cooling, the ventilation device 3 is operated to ventilate the target space S and lower the room temperature, and then the air conditioner 4 is operated to air-condition the target space S. In other words, during ventilation air-conditioning operation during cooling, the ventilation device 3 is operated in advance to lower the room temperature of the target space S, and then the air conditioner 4 is operated to make the target space S reach the set temperature at the set time Ts. This allows the ventilation air-conditioning control device 1 to operate the air conditioner 4 from a state where the difference between the room temperature and the set temperature is smaller than when the air conditioner 4 is operated at the same time as the ventilation device 3 starts operating, thereby reducing power consumption.

[0024] Here, since the room temperature of the target space S drops due to the operation of the ventilation device 3, it is necessary to take the drop in room temperature into consideration when controlling the air conditioner 4. This is because if the air conditioner 4 is controlled without taking into consideration the drop in room temperature due to the operation of the ventilation device 3, there is a possibility that the room temperature will not reach the set temperature at the set time Ts.

[0025] Therefore, the control unit 11 of the ventilation air-conditioning control device 1 determines an operation schedule for the air conditioner 4 using the room temperature after it has been lowered by the ventilation device 3. The operation schedule is a schedule for causing the room temperature to reach a set temperature at a set time Ts, and includes an air conditioning start time Tas at which the operation of the air conditioner 4 is to begin, and the operating capacity of the air conditioner 4. The air conditioning start time Tas is the time at which the room temperature can reach the set temperature at the set time Ts by starting the operation of the air conditioner 4 from that time. The operating capacity of the air conditioner 4 specifically refers to, for example, the operating frequency of the compressor.

[0026] The process for determining the operation schedule in the control unit 11 is not particularly limited and can employ existing technology, such as the technology disclosed in Japanese Patent No. 7170740. Specifically, the control unit 11 determines the air conditioning start time Tas and the operating capacity of the air conditioner 4 based on a learning model that indicates the input / output relationship between input data that influences the thermal load of the air conditioner 4 and output data that indicates the thermal load. The input data includes the current room temperature detected by the temperature detection device 4a1, the set temperature for the air conditioning schedule, the outdoor temperature, and the operating frequency of the air conditioner compressor. The output data is the thermal load processed by the air conditioner 4. The thermal load is proportional to the temperature difference between the room temperature and the set temperature. The control unit 11 determines the air conditioning start time Tas and the operating capacity of the air conditioner 4 using the current room temperature, the set temperature, the set time Ts, the outdoor temperature, and the learning model. The control unit 11 calculates the thermal load using the learning model and determines the air conditioning start time Tas and the operating capacity of the air conditioner 4 taking the thermal load into consideration. The process for determining the operation schedule is not limited to the above process, but may be determined based on at least the current room temperature, the set temperature, and the set time Ts.

[0027] (Ventilation air-conditioning operation during heating) In ventilation air-conditioning operation during heating, the air conditioner 4 is operated before the ventilation device 3 to heat the target space S, and then the ventilation device 3 is operated to ventilate. This is because if the air conditioner 4 and the ventilation device 3 are started to operate simultaneously during heating, it is difficult for the room temperature to rise and power consumption increases. For this reason, in ventilation air-conditioning operation during heating, the air conditioner 4 is operated in advance to heat the target space S. This allows the ventilation air-conditioning control device 1 to reduce power consumption compared to when the air conditioner 4 and the ventilation device 3 are operated simultaneously.

[0028] Here, since the room temperature of the target space S drops due to the operation of the ventilation device 3, when controlling the air conditioner 4, it is necessary to perform control taking into account the drop in room temperature due to ventilation by the ventilation device 3, which starts operating after the air conditioner 4. This is because if the air conditioner 4 is controlled without taking into account the drop in room temperature due to ventilation by the ventilation device 3, there is a possibility that the room temperature will not reach the set temperature at the set time Ts.

[0029] Therefore, the control unit 11 of the ventilation and air conditioning control device 1 presets a temperature correction value Δt due to the operation of the ventilator 3, updates the set temperature by adding Δt°C to it as the new set temperature, and determines the operation schedule of the air conditioner 4 so that the room temperature will reach the new set temperature. The temperature correction value Δt corresponds to the temperature range of the room temperature drop due to the operation of the ventilator 3. If the set temperature is, for example, 25°C and the temperature correction value Δt is, for example, 2°C, the control unit 11 determines the operation schedule of the air conditioner 4 so that the room temperature will be raised to 27°C when the operation of the ventilator 3 starts. In this way, the ventilation and air conditioning control device 1 can cause the room temperature to reach 25°C at the set time Ts.

[0030] Fig. 5 is a control flowchart (1 / 2) of the ventilation and air-conditioning control system 10 according to Embodiment 1. Fig. 6 is a control flowchart (2 / 2) of the ventilation and air-conditioning control system 10 according to Embodiment 1.

[0031] The user operates the operation unit 13 to set a schedule, for example, at 7:00 a.m. In setting the schedule, an air conditioning schedule and a ventilation setting that specifies whether ventilation is to be performed are input. In the following explanation, it is assumed that the air conditioning schedule shown in FIG. 3 has been input. When the user sets a schedule (step S1), the control unit 11 determines whether the schedule setting is set to ventilation ON (to ventilate) or ventilation OFF (to not ventilate) (step S2). If the control unit 11 determines that ventilation is set to ON, it then determines whether a ventilation schedule has been set (step S3). Whether a ventilation schedule has been set corresponds to whether a ventilation schedule has been set in advance by the user and stored in the memory unit 12.

[0032] If the control unit 11 determines that a ventilation schedule has been set, it temporarily suspends processing and enters a standby state until the first time T1 arrives (step S4). The first time T1 is, for example, a certain time (hereinafter referred to as the first time width W1) before the set time Ts. The first time width W1 is set to, for example, a time longer than the time required for the ventilation device 3 to operate at the lowest ventilation air volume, i.e., the lowest air volume, to replace the air in the entire volume of the target space S. The first time width W1 is, for example, 90 minutes.

[0033] At the first time T1, the control unit 11 returns from the standby state and determines whether the operation mode currently set in the air conditioner 4 is cooling or heating (step S5). If the control unit 11 determines that the operation mode is set to cooling, it starts operation of the ventilator 3 at the ventilation air volume set in the ventilation schedule (step S6) and starts ventilation of the target space S. That is, in the case of cooling operation, the ventilator 3 starts operation at the first time T1 at the ventilation air volume set in the ventilation schedule.

[0034] The control unit 11 then temporarily suspends processing and enters a standby state until the second time T2 arrives (step S7). The second time T2 is, for example, a certain time (hereinafter referred to as the second time width W2) before the set time Ts. The second time width W2 is set to a time shorter than the first time width W1. The second time width W2 is set to a time longer than the maximum required time for the room temperature to reach the set temperature through operation of the air conditioner 4. The second time width W2 is, for example, 60 minutes. The maximum required time is based on the maximum temperature difference between the room temperature and the set temperature expected in summer. Then, at the second time T2, the control unit 11 determines an operation schedule for the air conditioner 4 based on the current room temperature, the set temperature, and the set time Ts (step S8).

[0035] As described above, existing technology can be used for the process of determining the operation schedule. As described above, the second time width W2 is set to a time width longer than the maximum time required for the room temperature to reach the set temperature by operating the air conditioner 4. Therefore, the air conditioning start time Tas in the operation schedule is determined to be a time later than the current time, i.e., the second time T2. Then, the control unit 11 operates the air conditioner 4 based on the operation schedule (step S9). In other words, when the air conditioning start time Tas arrives, the control unit 11 operates the compressor of the air conditioner 4 at the operation frequency set in the operation schedule.

[0036] 3 and the ventilation schedule of FIG. 4 are set, the first time span W1 is, for example, 90 minutes, and the second time span W2 is, for example, 60 minutes, then the first time T1 is 10:30 and the second time T2 is 11:00. In this case, the above processing results in the control of the ventilation and air conditioning control device 1 being as follows: After the air conditioning schedule is input at 7:00, the ventilation and air conditioning control device 1 starts operating the ventilation device 3 at a high ventilation airflow rate at 10:30 (first time T1). The ventilation and air conditioning control device 1 then determines an operation schedule based on the room temperature at 11:00 (second time T2), and when the air conditioning start time Tas of the operation schedule arrives, it operates the air conditioner 4 at the determined operating capacity.

[0037] The air conditioning start time Tas is determined using the room temperature at 11:00 (second time T2), and is therefore determined using the room temperature that has dropped due to the operation of the ventilation device 3. This allows the ventilation air conditioning control device 1 to operate in a way that takes into account changes in room temperature caused by the ventilation device 3, and allows the room temperature to reach the set temperature at the set time Ts.

[0038] In addition, the ventilation device 3 starts operating at 10:30 with a strong ventilation air volume, so the CO ２ Although not shown in the flowchart of FIG. 5, the control unit 11 controls the CO ２ CO detected by concentration detection device 2 ２ The target CO concentration set in the ventilation schedule ２ The control unit 11 checks whether the CO concentration has reached the set value. ２The target concentration is CO ２ When it is determined that the concentration has reached the predetermined value, the operation of the ventilation device 3 is stopped.

[0039] CO ２ The target concentration is CO ２ The timing at which the concentration is reached is the CO concentration in the target space S at the start of operation of the ventilation device 3. ２ concentration and target CO ２ Although it depends on the concentration and ventilation air volume, it will be a time before the set time Ts. This is because the first time width W1 is set to a time longer than the time required for the entire volume of air in the target space S to be replaced by, for example, operating the ventilation device 3 at the minimum air volume, as described above. By setting the first time width W1 to the above time and starting operation of the ventilation device 3 at the first time T1, the ventilation air-conditioning control device 1 will be able to ２ Target concentration CO ２ Concentrations can be reached.

[0040] The ventilation and air conditioning control device 1 ２ The target concentration is CO ２ In this example, the operation of the ventilation device 3 is stopped when the concentration reaches the set value, but the control is not limited to this. The ventilation air-conditioning control device 1 may continue to operate the ventilation device 3 until the set time Ts, and then stop the ventilation device 3 when the set time Ts is reached. In this case, the ventilation air-conditioning control device 1 ２ Target concentration CO ２ The concentration can be lower than that.

[0041] If the operation mode of the air conditioner 4 is set to heating in step S5, the control unit 11 determines a ventilation start time Tvs for operating the ventilation device 3 (step S10). The control unit 11 first calculates the ventilation required time Tv as follows, and determines the ventilation start time Tvs based on the ventilation required time Tv and the set time Ts.

[0042] The ventilation time Tv is the CO ２ The concentration is the target CO ２ The control unit 11 controls the CO ２The CO concentration detected by the concentration detection device 2 at the present time, i.e., the first time T1 ２ concentration and target CO ２ It is calculated based on the concentration, the ventilation air volume set in the ventilation schedule, and ventilation capacity information (described later) previously set in the storage unit 12. The ventilation required time Tv is calculated to be "10 minutes" in the following cases:

[0043] Current CO ２ Concentration: 1000ppm Target CO ２ Concentration: 800 ppm Ventilation airflow: Weak Ventilation capacity information: -20

[0044] Ventilation capacity information is the CO₂ per unit time according to the ventilation air volume. ２ The ventilation capacity information is information about the amount of change in concentration. Specifically, for example, the horizontal axis is time (minutes) and the vertical axis is CO ２ The ventilation capacity information "-20" indicates the CO concentration (ppm) in one minute of operation of the ventilation device 3. ２ This indicates a 20 ppm decrease in concentration. This example is for a case where the ventilation air volume is weak, and when the ventilation air volume is strong, the negative slope is greater than when the ventilation air volume is weak.

[0045] The ventilation start time Tvs is set to be earlier than the set time Ts by the required ventilation time Tv. Therefore, if the set time Ts is 12:00 and the required ventilation time Tv is 10 minutes, the ventilation start time Tvs will be 11:50.

[0046] Next, the control unit 11 changes the target time, which is the time when the set temperature is reached, to the ventilation start time Tvs and sets a new target time (step S11). The control unit 11 adds a preset Δt°C to the set temperature set in the air conditioning schedule to set a new set temperature (step S12). The control unit 11 then temporarily suspends processing and enters a standby state until a third time T3 arrives (step S25). The third time T3 is a second time width W2 before the new target time set in step S11.

[0047] At the third time T3, the control unit 11 determines an operation schedule for the air conditioner 4 (step S14). The control unit 11 determines the operation schedule for the air conditioner 4 based on the current room temperature detected by the temperature detection device 4a1, the new set temperature (set temperature Ts + temperature correction value Δt) set in step S12, and the new target time (ventilation start time Tvs) set in step S11. As described above, existing technology can be used for the process of determining the operation schedule. The control unit 11 then operates the air conditioner 4 based on the operation schedule (step S15), and then starts operation of the ventilator 3 at the ventilation airflow rate set in the ventilation schedule at the ventilation start time Tvs determined in step S10 (step S16).

[0048] 3 and the ventilation schedule of Fig. 4 are set, the first time width W1 is, for example, 90 minutes, the second time width W2 is, for example, 60 minutes, the ventilation required time Tv is, for example, 10 minutes, and the air conditioning start time Tas is, for example, 11:40, the control by the ventilation air conditioning control device 1 is as follows: The ventilation air conditioning control device 1 starts operation of the air conditioner 4 at 11:40 to heat the target space S, and at 11:50, causes the room temperature to reach a temperature Δt°C higher than the set temperature and starts operation of the ventilation device 3 at a weak ventilation airflow rate.

[0049] The set temperature, which is the target temperature for the air conditioner 4, is updated to a temperature obtained by adding Δt°C to the set temperature, and the temperature setting takes into account the temperature correction value Δt for the temperature drop caused by the operation of the ventilation device 3. As a result, the ventilation air-conditioning control device 1 can operate in a way that takes into account changes in room temperature caused by the ventilation device 3, and can cause the room temperature to reach the set temperature at the set time Ts.

[0050] Furthermore, the ventilation air conditioning control device 1 starts the operation of the ventilation device 3 before the ventilation required time Tv at the set time Ts. ２ Target concentration CO ２ Concentrations can be reached.

[0051] On the other hand, if the control unit 11 determines in step S3 that a ventilation schedule has not been set, it temporarily suspends processing and enters a standby state until the first time T1 (step S17). Then, at the first time T1, the control unit 11 returns from the standby state and determines whether the operation mode currently set in the air conditioner 4 is cooling or heating (step S18).

[0052] If the control unit 11 determines that the operation mode is set to cooling, it determines whether the temperature obtained by subtracting the outdoor temperature from the room temperature (hereinafter, "room temperature - outdoor temperature") is, for example, less than 5°C or greater than 5°C (step S19). If "room temperature - outdoor temperature" is less than 5°C, the control unit 11 starts operation of the ventilator 3 at a weak ventilation airflow rate (step S20). If "room temperature - outdoor temperature" is 5°C or greater, the control unit 11 starts operation of the ventilator 3 at a strong ventilation airflow rate (step S21). In other words, if a ventilation schedule is not set, no ventilation airflow rate is specified, and the control unit 11 starts operation of the ventilator 3 at a weak ventilation airflow rate or a strong ventilation airflow rate based on the result of "room temperature - outdoor temperature." Subsequent processing is the same as steps S7 to S9.

[0053] When the control unit 11 determines in step S18 that the operation mode is set to heating, it determines the ventilation start time Tvs at which the ventilation device 3 is to operate (step S22). ２ Because the concentration is not set, the control unit 11 determines the fourth time T4 as the ventilation start time Tvs. The fourth time T4 is a certain time (hereinafter, referred to as the third time width W3) before the set time Ts. The third time width W3 is, for example, 10 minutes.

[0054] Next, the control unit 11 changes the target time, which is the time when the set temperature is reached, to the ventilation start time Tvs and sets a new target time (step S23). The control unit 11 adds a preset Δt°C to the set temperature set in the air conditioning schedule to set a new set temperature (step S24). The control unit 11 then temporarily suspends processing and enters a standby state until a third time T3 is reached (step S25). The third time T3 is a second time width W2 before the target time set in step S23. When the third time T3 is reached, the control unit 11 proceeds to the processing of step S14.

[0055] In step S14, the control unit 11 determines an operation schedule based on the current room temperature detected by the temperature detection device 4a1, the new set temperature set in step S24, and the new target time (ventilation start time Tvs) set in step S23 (step S14). The control unit 11 then operates the air conditioner 4 based on the operation schedule (step S15), and then starts operation of the ventilation device 3 at the ventilation start time Tvs determined in step S22 (step S16). Note that when the ventilation device 3 is operating without a set ventilation schedule, the control unit 11 operates the ventilation device 3 at the same air volume setting as the previous air volume setting. When the ventilation device 3 is operating without a set ventilation schedule and there is no previous air volume setting, the control unit 11 operates the ventilation device 3 at a low ventilation air volume.

[0056] 3 is set, a ventilation schedule is not set, the first time span W1 is, for example, 90 minutes, the second time span W2 is, for example, 60 minutes, and the third time span W3 is, for example, 10 minutes, the first time T1 is 10:30, the third time T3 is 10:50, and the fourth time T4 is 11:50. In this case, the control of the ventilation air-conditioning control device 1 is as follows.

[0057] In the case of cooling, the ventilation and air conditioning control device 1 starts operation of the ventilation device 3 at a weak or strong ventilation air volume based on the result of "room temperature - outside air temperature" as of 10:30. In the case of heating, the ventilation and air conditioning control device 1 determines the air conditioning start time Tas based on the room temperature as of 10:50, which is the third time T3. If the air conditioning start time Tas is, for example, 11:10, the ventilation and air conditioning control device 1 will start operation of the air conditioner 4 at 11:10, and then start operation of the ventilation device 3 at 11:50, which is the fourth time T4.

[0058] Furthermore, if the control unit 11 determines in step S2 that ventilation is set to OFF, it temporarily suspends processing and enters a standby state until the second time T2 (step S26). Then, at the second time T2, the control unit 11 determines an operation schedule for the air conditioner 4 (step S27). The process of determining the operation schedule is the same as the process of step S8. Then, the control unit 11 operates the air conditioner 4 based on the operation schedule (step S28).

[0059] Through the above control, the ventilation and air conditioning control system 10 can reduce the feeling of heat or cold and insufficient ventilation when a user enters the target space S, thereby improving comfort and reducing power consumption during both cooling and heating.

[0060] The specific values ​​of the temperature, time duration, time, etc. in the above flow are merely examples, and may be set appropriately depending on the actual conditions of use, etc.

[0061] FIG. 7 is an explanatory diagram of ventilation air-conditioning operation during cooling in the ventilation air-conditioning control system 10 according to Embodiment 1. FIG. 7 shows an example when a ventilation schedule is set. In FIG. 7, the horizontal axis represents time and the vertical axis represents room temperature. (1) in FIG. 7 is a graph for ventilation air-conditioning operation according to Embodiment 1. (2) in FIG. 7 is a graph for a comparative example. FIG. 7 shows an example when the outside air temperature is 35°C in summer.

[0062] As shown in Figure 7 (1), in the ventilation air-conditioning operation during cooling in the first embodiment, the operation of the ventilation device 3 is started at the ventilation start time Tvs, which is before the air-conditioning start time Tas. As a result, the room temperature gradually drops from 35°C. Then, the operation of the air-conditioning device 4 is started at the air-conditioning start time Tas, which is determined based on the room temperature of 33°C at the second time T2, so that the room temperature further drops, and reaches the target temperature of 25°C at the set time Ts.

[0063] Comparative example (2) is a graph showing a case where the ventilation device 3 is not operated and the same operation as the air conditioner 4 of embodiment 1 is started at the air conditioning start time Tas. In the comparative example, the same operation as the air conditioner 4 of embodiment 1 is started in an environment where the room temperature is 35°C, so the room temperature does not reach 25°C at the set time Ts and is slightly higher than 25°C.

[0064] FIG. 8 is an explanatory diagram of ventilation air-conditioning operation during heating in the ventilation air-conditioning control system 10 according to Embodiment 1. FIG. 8 shows an example in which a ventilation schedule is set. In FIG. 8, the horizontal axis represents time and the vertical axis represents room temperature. (1) in FIG. 8 is a graph in the case of ventilation air-conditioning operation according to Embodiment 1. (2) in FIG. 8 is a graph in the case of a comparative example. FIG. 8 shows an example in which the outside air temperature is 5°C in winter.

[0065] As shown in Figure 8 (1), in the ventilation air-conditioning operation during heating in embodiment 1, operation of the air conditioner 4 is started at the air-conditioning start time Tas. As a result, the room temperature gradually rises from 15°C, and at the ventilation start time Tvs, it reaches a temperature that is Δt°C higher than the set temperature of 25°C. Then, at the ventilation start time Tvs, operation of the ventilation device 3 is started, and the room temperature drops by Δt°C, and at the set time Ts, the room temperature reaches the target temperature of 25°C.

[0066] The comparative example (2) is a graph showing a case where the target arrival time of air conditioning control is set to the set time Ts and the operation of the air conditioner 4 and the ventilation device 3 is started at the ventilation start time Tvs. In the comparative example, the operation of the ventilation device 3 is started before the target space S is sufficiently warmed, so the room temperature does not reach the target temperature of 25°C.

[0067] As described above, the ventilation and air-conditioning control device 1 of embodiment 1 is a device that controls a ventilation and air-conditioning control system 10 that includes an air conditioner 4 that adjusts the room temperature of a target space S to air-condition the target space S, and a ventilation device 3 that ventilates the target space S. The ventilation and air-conditioning control device 1 includes a control unit 11 that performs ventilation and air-conditioning operation to operate the air conditioner 4 and the ventilation device 3, and a memory unit 12 that stores an air-conditioning schedule that includes a set temperature and a set time Ts. In ventilation and air-conditioning operation during cooling, the control unit 11 starts operation of the ventilator 3 at a first time T1, which is a time before the set time Ts. After starting operation of the ventilator 3 at the first time T1, the control unit 11 determines an operation schedule for the air conditioner 4 at a second time T2 that is after the first time T1 and before the set time Ts, so that the room temperature of the target space S will reach the set temperature at the set time Ts, and operates the air conditioner 4 based on the operation schedule.

[0068] With the above configuration, the ventilation and air conditioning control device 1 can perform sufficient ventilation by operating the ventilator 3 at the first time T1 before the air conditioner 4 starts operating, thereby ensuring an appropriate ventilation state in the target space S. Furthermore, because the ventilation and air conditioning control device 1 determines the operation schedule for the air conditioner 4 at the second time T2 after the ventilator 3 starts operating, the operation schedule reflects the room temperature in the target space S after it has been lowered by the operation of the ventilator 3. Therefore, the ventilation and air conditioning control device 1 can cause the room temperature to reach the set temperature at the set time Ts by operating the air conditioner 4 based on the operation schedule.

[0069] The storage unit 12 stores a ventilation schedule having ventilation air volumes. The control unit 11 operates the ventilation device 3 at the ventilation air volume at a first time T1.

[0070] With the above configuration, the ventilation and air conditioning control device 1 can operate the ventilator 3 at the ventilation air volume set in the ventilation schedule.

[0071] The first time T1 is a time before the set time Ts by a first time width W1. The first time width W1 is set to be a time longer than the time required for the ventilation device 3 to operate at the minimum air volume to replace the air in the entire volume of the target space S.

[0072] With the above configuration, the ventilation and air conditioning control device 1 can ２ The concentration can be sufficiently reduced by the set time Ts, and the ventilation state of the target space S can be made appropriate at the set time Ts.

[0073] The ventilation air-conditioning control device 1 of the first embodiment is a device that controls a ventilation air-conditioning control system 10 that has an air conditioner 4 that adjusts the room temperature of a target space S to air-condition the target space S, and a ventilation device 3 that ventilates the target space S. The ventilation air-conditioning control device 1 includes a control unit 11 that performs ventilation air-conditioning operation to operate the air conditioner 4 and the ventilation device 3, an air-conditioning schedule having a set temperature and a set time Ts, and a ventilation airflow rate and a target CO ２ The control unit 11 stores a ventilation schedule having a CO concentration in the target space S at a first time T1, which is a time before the set time Ts, during ventilation air-conditioning operation during heating. ２ The concentration is set to the target CO ２ The control unit 11 determines the ventilation start time Tvs, which is the time when the ventilation device 3 starts operating to reach the CO concentration in the target space S. ２ concentration and target CO ２ The control unit 11 determines a ventilation start time Tvs based on the concentration, ventilation airflow rate, and set time Ts. At a third time T3 that is after the first time T1 and before the set time Ts, the control unit 11 determines an operation schedule for the air conditioner 4 based on the room temperature of the target space S, the set temperature, a temperature correction value due to the operation of the ventilation device 3, and the ventilation start time Tvs. The control unit 11 operates the air conditioner 4 based on the operation schedule, and then controls the ventilation device 3 to start operating at the ventilation start time Tvs. The operation schedule is a schedule for causing the room temperature of the target space S to reach a temperature obtained by adding the temperature correction value Δt to the set temperature at the ventilation start time Tvs.

[0074] With the above configuration, the ventilation air-conditioning control device 1 determines the ventilation start time Tvs, and then determines an operation schedule for the air conditioners 4 to make the room temperature in the target space S reach a temperature obtained by adding a temperature correction value to the set temperature at the ventilation start time Tvs. Therefore, the operation schedule reflects the decrease in room temperature in the target space S due to the operation of the ventilation device 3. Therefore, the ventilation air-conditioning control device 1 can make the room temperature reach the set temperature at the set time Ts by operating the air conditioners 4 based on the operation schedule. In addition, the ventilation air-conditioning control device 1 determines the CO ２ The concentration is set to the target CO ２ By operating the ventilation device 3 at the ventilation start time Tvs, which is the time when the ventilation device 3 starts operating to reach the concentration, the ventilation state of the target space S can be made appropriate at the set time Ts.

[0075] Embodiment 2. The ventilation and air-conditioning control system 10 of the above-mentioned embodiment 1 was an apparatus that performed ventilation and air-conditioning operation by operating both the ventilation device 3 and the air conditioner 4. The ventilation and air-conditioning control system 10 of embodiment 2 is capable of ventilation operation by operating only the ventilation device 3, and is a system that can selectively perform the above-mentioned ventilation and air-conditioning operation and ventilation operation. The following description will focus on the differences between embodiment 2 and embodiment 1, and matters not described in embodiment 2 are the same as embodiment 1. The configuration of the ventilation and air-conditioning control system 10 is the same as embodiment 1.

[0076] In the ventilation / air-conditioning control system 10 of the second embodiment, the control unit 11 selectively performs the ventilation / air-conditioning operation of the first embodiment and a ventilation operation that controls only the ventilator 3. The selection between the ventilation / air-conditioning operation and the ventilation operation is performed by the user operating the operation unit 13. Specifically, for example, the control unit 11 displays a selection screen for the ventilation / air-conditioning operation and the ventilation operation on the operation unit 13, and the user selects the ventilation / air-conditioning operation or the ventilation operation by performing a selection operation according to the selection screen.

[0077] FIG. 9 is a control flowchart of the ventilation air-conditioning control system 10 when ventilation operation is selected by the user.

[0078] 9 is a control flowchart of the ventilation air-conditioning control system 10 according to the second embodiment. For example, the user operates the operation unit 13 at 7:00 a.m. to select ventilation operation, and then sets a ventilation schedule. As shown in FIG. 4, the ventilation schedule includes a start time Tst, an end time Tet, a ventilation air volume, and a target CO ２ When the user sets a ventilation schedule (step S31), the control unit 11 temporarily suspends processing and enters a standby state until the fifth time T5 (step S32). The fifth time T5 is, for example, a certain time (hereinafter referred to as the fifth time width W5) before the start time Tst set in the ventilation schedule. The fifth time width W5 is, for example, 15 minutes. Then, at the fifth time T5, the control unit 11 returns from the standby state and starts the CO ２ Current CO detected by concentration detection device 2 ２ Target CO concentration and ventilation schedule ２ The density is compared (step S33).

[0079] In step S33, the control unit 11 ２ The target concentration is CO ２ If it is determined that the concentration is greater than the target concentration, the control unit 11 sets the start time Tst of the ventilation schedule to the target time (step S34). Then, the control unit 11 specifies ventilation capacity information corresponding to the ventilation air volume of the ventilation schedule (step S35). The ventilation capacity information is the CO 2 per unit time corresponding to the ventilation air volume. ２ The information on the amount of change in concentration is, for example, time (minutes) on the horizontal axis and CO ２ The slope of the graph is the concentration (ppm). The ventilation capacity information is calculated by the control unit 11 based on the operation log that is periodically stored in the memory unit 12 of the ventilation and air-conditioning control system 10. Fig. 10 shows an example of the operation log.

[0080] 10 is a diagram showing an example of an operation log of the ventilation air-conditioning control system 10 according to Embodiment 2. The operation log includes a target CO ２ concentration, target time, and current CO ２ The operation log shown in the figure shows that when the ventilation air volume is low, the CO ２Because the concentration has decreased by 20 ppm, the ventilation capacity information is calculated as "-20." The ventilation capacity information may be calculated using the operation log from the current time up to several hours ago, or may be calculated using the average of the operation logs from the past few days.

[0081] The ventilation capacity information specified in step S35 may be determined by the control unit 11 dynamically calculating the ventilation capacity information based on the latest operation log, or by searching for ventilation capacity information that has been calculated in advance based on the operation log and stored in the storage unit 12. In either case, the ventilation capacity information specified in the second embodiment may be calculated based on the operation log, and may be calculated dynamically or calculated in advance.

[0082] The control unit 11 receives ventilation capacity information, a ventilation schedule, and a current CO ２ concentration and target CO ２ Based on the concentration and the target time, the ventilation start time Tvs is determined in the same manner as above (step S36). The target time used to determine the ventilation start time Tvs is the target time set in step S34. When the ventilation start time Tvs determined in step S36 arrives, the control unit 11 starts operating the ventilator 3 at the ventilation airflow rate set in the ventilation schedule (step S37). Then, when the end time Tet arrives (step S38), the control unit 11 stops the operation of the ventilator 3 (step S39).

[0083] The start time Tst of the ventilation schedule is set to a time when it is considered that a user is present in the target space S. Therefore, the current CO ２ The target concentration is CO ２ If the concentration is greater than the target space S, the CO ２ The target concentration is CO ２ Therefore, the ventilation air-conditioning control device 1 ２ The target concentration is CO ２If the concentration is greater than the target concentration, the ventilation device 3 starts operating at the ventilation start time Tvs, which is earlier than the start time Tst of the ventilation schedule. ２ The concentration is set to the target CO ２ Concentrations can be reached.

[0084] On the other hand, the control unit 11 determines the current CO ２ The target concentration is CO ２ If it is determined that the concentration is below the current CO ２ If the concentration cannot be measured, the control unit 11 determines the start time Tst set in the ventilation schedule as the ventilation start time Tvs (step S40). After determining the ventilation start time Tvs in step S40, the control unit 11 performs the same processes as in steps S36 to S39. ２ When the concentration cannot be measured, ２ The concentration of CO ２ This refers to the case where, after measurement by the concentration detection device 2, a correct value cannot be received due to a communication error with the ventilation and air-conditioning control device 1.

[0085] Current CO of target space S ２ The target concentration is CO ２ If the concentration is below this level, immediate ventilation is not required. ２ The target concentration is CO ２ If the concentration is below the set value, control is performed according to the schedule set in the ventilation schedule, that is, the operation of the ventilation device 3 is started at the start time Tst and ended at the end time Tet.

[0086] Fig. 11 is an explanatory diagram of ventilation operation in the ventilation air-conditioning control system 10 according to Embodiment 2. In Fig. 11, the horizontal axis represents time, and the vertical axis represents CO ２ 11A is a graph showing the ventilation operation of the second embodiment. FIG. 11B is a graph showing the comparative example. FIG. 11 shows an example where the ventilation air volume is weak.

[0087] As shown in (1) of Fig. 11, in the ventilation operation of the second embodiment, the ventilation start time Tvs is determined at a fifth time T5, which is a fifth time width W5 before the start time Tst, and the operation of the ventilation device 3 starts at the ventilation start time Tvs. ２ The concentration gradually decreases from 1000 ppm, and the target CO ２ concentration is reached.

[0088] The comparative example (2) is a graph showing the case where ventilation operation is performed according to the ventilation schedule. That is, the operation of the ventilation device 3 starts at the start time Tst and stops at the end time Tet.

[0089] The ventilation air-conditioning control device 1 of the second embodiment can obtain the same effects as those of the first embodiment, and can improve convenience by being able to select between ventilation air-conditioning operation and ventilation operation. Furthermore, the ventilation air-conditioning control device 1 of the second embodiment can ventilate in advance, that is, by starting the operation of the ventilation device 3 before the start time Tst, thereby reducing the CO 2 in the target space S at the start time Tst. ２ Target concentration CO ２ It is possible to approach the concentration.

[0090] Furthermore, the ventilation air-conditioning control device 1 of embodiment 1 achieves the following effects by setting the timing for starting operation of the ventilator 3 in ventilation mode to a ventilation start time Tvs determined based on ventilation capacity information based on the operation log: The operation log is information that is affected by the size of the target space S in which the ventilator 3 is installed and the capacity of the ventilator 3. For this reason, the ventilation air-conditioning control device 1 of embodiment 2 sets the timing for starting operation of the ventilator 3 to a ventilation start time Tvs determined based on ventilation capacity information based on the operation log, thereby achieving a faster CO2 reduction in the target space S at the target time compared to, for example, using a ventilation start time set by default. ２ Target concentration CO ２ This increases the certainty of achieving the desired concentration.

[0091] 1 ventilation and air conditioning control device, 2 CO ２Concentration detection device, 3 Ventilation device, 4 Air conditioner, 4a Indoor unit, 4a1 Temperature detection device, 4b Outdoor unit, 5a Communication, 5b Communication, 5c Communication, 10 Ventilation and air conditioning control system, 11 Control unit, 12 Memory unit, 13 Operation unit, 14 CO ２ Inter-concentration detection device communication unit, 15 Ventilation device communication unit, 16 Air conditioning device communication unit, 21 Inter-controller communication unit, 22 CO ２ Concentration detection unit, S target space.

Claims

1. A ventilation and air conditioning control device that controls a ventilation and air conditioning control system having an air conditioner that adjusts the room temperature of a target space to air-condition the target space, and a ventilation device that ventilates the target space, comprising: a control unit that performs ventilation and air-conditioning operation to operate the air conditioner and the ventilation device; and a memory unit that stores an air-conditioning schedule having a set temperature and a set time, wherein the control unit, during the ventilation and air-conditioning operation during cooling, starts operation of the ventilation device at a first time that is a time before the set time on the air-conditioning schedule, and then, at a second time that is after the first time and before the set time, determines an operation schedule for the air conditioner that will cause the room temperature of the target space to reach the set temperature at the set time, and operates the air conditioner based on the operation schedule.

2. A ventilation and air conditioning control device as described in claim 1, wherein the memory unit stores a ventilation schedule having a ventilation air volume, and the control unit operates the ventilation device at the ventilation air volume at the first time.

3. A ventilation and air conditioning control device as described in claim 2, wherein the first time is a time a first time width before the set time, and the first time width is set to a time longer than the time required for the ventilation device to operate at the minimum air volume to replace the air in the entire volume of the target space.

4. A ventilation and air conditioning control device that controls a ventilation and air conditioning control system having an air conditioner that adjusts the room temperature of a target space to air condition the target space, and a ventilation device that ventilates the target space, the ventilation and air conditioning control system comprising: a control unit that performs ventilation and air conditioning operation to operate the air conditioner and the ventilation device; an air conditioning schedule that has a set temperature and a set time, and a ventilation air volume and a target CO ２ and a storage unit that stores a ventilation schedule having a CO concentration of the target space at a first time that is a time before the set time of the air conditioning schedule during the ventilation air conditioning operation during heating. ２ The concentration is set to the target CO ２ The ventilation start time, which is the time when the ventilation device starts operating to reach the CO concentration in the target space, is set to ２ concentration and the target CO ２ a ventilation air conditioning control device that determines an operation schedule for the air conditioner based on the concentration, the ventilation air volume, and the set time, and at a third time after the first time and before the set time, determines an operation schedule for the air conditioner based on the room temperature of the target space, the set temperature, a temperature correction value resulting from the operation of the ventilation device, and the ventilation start time, operates the air conditioner based on the operation schedule, and then controls the ventilation device to start operation at the ventilation start time, wherein the operation schedule is a schedule for causing the room temperature of the target space to reach a temperature obtained by adding the temperature correction value to the set temperature at the ventilation start time.

5. A ventilation and air conditioning control device as described in any one of claims 1 to 4, which has an operation unit that accepts operations from a user, and the control unit selectively performs the ventilation and air conditioning operation that operates the ventilation device and the air conditioning device, or the ventilation operation that operates only the ventilation device, based on a selection operation from the operation unit.

6. The ventilation schedule has a start time, and the control unit is configured to select the ventilation operation and control the CO 2 of the target space. ２ The target concentration is CO ２ A ventilation and air conditioning control device as described in any one of claims 5 dependent on claim 2, claim 5 dependent on claim 3, and claim 5 dependent on claim 4, wherein if the concentration is greater than the concentration, operation of the ventilation device is started before the start time.

7. The control unit determines a ventilation start time at which the operation of the ventilation device is started in the ventilation operation based on a CO 2 per unit time corresponding to a ventilation air volume of the ventilation device. ２ The ventilation air-conditioning control device according to claim 6, wherein the determination is based on ventilation capacity information relating to the amount of change in concentration.

8. Ventilation air volume and current CO2 in the target space ２ The ventilation air-conditioning control device according to claim 7, wherein an operation log including the concentration is periodically recorded in the storage unit, and the control unit determines the ventilation start time in the ventilation operation based on the ventilation capacity information calculated based on the operation log.

9. A ventilation and air-conditioning control device according to any one of claims 1 to 8, a temperature detection device for detecting the room temperature of the target space, and a CO ２ CO concentration detection ２ A ventilation and air-conditioning control system comprising: a concentration detection device; the ventilation device; and the air conditioner.

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