Air conditioner

Abstract

To disclose one example of an air conditioner in view of the fact that when an air conditioner is thermo-off, an indoor unit itself stops and thus the temperature / humidity of an air conditioning space serviced by the indoor unit cannot be adjusted until the indoor unit is re-operated.SOLUTION: In an air conditioner, ventilation coordination control to increase an amount of introduction of outdoor air compared to before can be executed when an outdoor air temperature is higher than an indoor air temperature during air-cooling operation, and a temperature difference is equal to or greater than a predefined temperature difference, and when it is possible to consider that a generation capacity of an indoor unit has fallen below a predefined generating capacity equal to or greater than a lower limit. Thus, the air conditioner can suppress the stop of the indoor unit while suppressing the stop of a steam compression type refrigerating machine.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present disclosure relates to an air conditioner having a ventilation function. [Background technology]

[0002] In order to suppress an increase in power consumption due to the start and stop of the compressor, for example, the air conditioner described in Patent Document 1 can execute a start / stop suppression operation mode. The start / stop suppression operation mode is an operation mode in which, when one of multiple indoor units meets the compressor stop conditions and there are no other indoor units in operation, the indoor unit in question is stopped and the other indoor units are operated. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] International Publication WO2016 / 016918 Summary of the Invention [Problem to be solved by the invention]

[0004] In the air conditioner described in Patent Document 1, the indoor unit itself stops, and therefore the temperature and humidity of the air-conditioned space that the indoor unit is responsible for cannot be regulated until the indoor unit starts operating again. The present disclosure discloses an example of an air conditioner that takes this point into consideration. [Means for solving the problem]

[0005] The air conditioner preferably includes at least one of the following components: an indoor unit (3) that performs air conditioning in a room by utilizing cold heat generated by a vapor compression refrigerator (hereinafter referred to as air conditioning capacity), an indoor air temperature sensor (Si1) that detects the indoor air temperature, an outdoor air temperature sensor (So) that detects the outdoor air temperature, a first control unit (13) that controls the increase / decrease of the air conditioning capacity (hereinafter referred to as generation capacity) by utilizing at least the temperature detected by the indoor air temperature sensor (Si1), the first control unit (13) being capable of performing thermo-off control to stop the vapor compression refrigerator when the generation capacity reaches a predetermined lower limit value, and an outdoor air temperature sensor (So) that controls the increase / decrease of the air conditioning capacity by utilizing at least the temperature detected by the indoor air temperature sensor (Si1), the first control unit (13) being capable of performing thermo-off control to stop the vapor compression refrigerator when the generation capacity reaches a predetermined lower limit value. and a second control unit (13) that controls the amount of outdoor air introduced by the ventilation unit (9) (hereinafter referred to as the intake amount), and that is capable of executing ventilation interlocking control, wherein the ventilation interlocking control is a control that increases the intake amount compared to immediately before the execution of the ventilation interlocking control, and further, the ventilation interlocking control is executed when the temperature detected by the outside air temperature sensor (So) is higher than the temperature detected by the inside air temperature sensor (Si1) and the temperature difference is equal to or greater than a predetermined temperature difference, and when it is possible to consider that the generation capacity has become equal to or less than the predetermined generation capacity that is equal to or greater than a lower limit value.

[0006] As a result, in the air conditioner, the vapor compression refrigeration machine can be prevented from stopping, and the indoor unit (3) can also be prevented from stopping. Incidentally, the symbols in each of the parentheses above are examples showing the correspondence with the specific configurations, etc. described in the embodiments described below, and the present disclosure is not limited to the specific configurations, etc. shown by the symbols in the parentheses above. [Brief explanation of the drawings]

[0007] [Figure 1] 1 is a diagram showing an air conditioning device according to a first embodiment. [Figure 2] 1 is a control block diagram of an air conditioner according to a first embodiment. [Figure 3] 3 is a flowchart of the air conditioner according to the first embodiment. [Figure 4] 4A to 4C are diagrams illustrating the effects of the air conditioner according to the first embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0008] The following "embodiments of the invention" are examples of embodiments that fall within the technical scope of the present disclosure. In other words, the invention-specific matters described in the claims are not limited to the specific configurations and structures shown in the following embodiments.

[0009] At least one of a component or part that is described with a reference numeral is provided unless otherwise specified, such as "one." The air conditioner disclosed in this disclosure includes at least one of the components, such as a component or part, that is described with a reference numeral.

[0010] (First embodiment) <1. Air conditioning equipment configuration> In this embodiment, an example of an air conditioning system according to the present disclosure is applied to a building air conditioning system. Specifically, as shown in Fig. 1, the air conditioning system 1 includes at least a plurality of (two in Fig. 1) indoor units 3 and 5, an outdoor unit 7, indoor air temperature sensors Si1 and Si2, an outdoor air temperature sensor So, carbon dioxide sensors Sc1 and Sc2, ventilators 9 and 11, and a control device 13 (see Fig. 2).

[0011] The indoor units 3 and 5 condition the air in the rooms. The indoor unit 3 (hereinafter referred to as the first indoor unit 3) mainly conditions the air in the first room A1. The indoor unit 5 (hereinafter referred to as the second indoor unit 5) mainly conditions the air in the second room A2.

[0012] Each indoor unit 3, 5 has at least an indoor heat exchanger 3A, 5A, a blower 3B, 5B, and a pressure reducer 3C, 5C, etc. The indoor heat exchanger 3A, 5A exchanges heat between a refrigerant and air to be supplied indoors, thereby cooling or heating the air.

[0013] The fans 3B and 5B blow the air that has exchanged heat with the indoor heat exchangers 3A and 5A into the room. The pressure reducers 3C and 5C reduce the pressure of the refrigerant. The operation of the fans 3B and 5B and the pressure reducers 3C and 5C is controlled by a control device 13.

[0014] The outdoor unit 7 constitutes a vapor compression refrigeration machine in cooperation with the indoor units 3 and 5. Specifically, the outdoor unit 7 has at least a compressor 7A, an outdoor heat exchanger 7B, a blower 7C, a switching valve 7D, a pressure reducer 7E, and the like.

[0015] The compressor 7A sucks in, compresses, and discharges gas-phase refrigerant. The outdoor heat exchanger 7B exchanges heat between the refrigerant and outdoor air. The blower 7C blows outdoor air to the outdoor heat exchanger 7B. The switching valve 7D switches the connection destination of the suction side and the discharge side of the compressor 7A.

[0016] Specifically, during cooling operation, the switching valve 7D connects the suction side of the compressor 7A to the outlet side of the indoor heat exchangers 3A and 5A, and connects the discharge side of the compressor 7A to the inlet side of the outdoor heat exchanger 7B.

[0017] During heating operation, the switching valve 7D connects the suction side of the compressor 7A to the outlet side of the outdoor heat exchanger 7B and connects the discharge side of the compressor 7A to the inlets side of the indoor heat exchangers 3A and 5A. The pressure reducer 7E reduces the pressure of the refrigerant. The operations of the compressor 7A, the blower 7C, the switching valve 7D, and the pressure reducer 7E are controlled by the control device 13.

[0018] The inside air temperature sensors Si1 and Si2 detect the temperature of air inside the vehicle. The inside air temperature sensor Si1 detects the temperature of air inside the first compartment A1. The inside air temperature sensor Si2 detects the temperature of air inside the second compartment A2.

[0019] The carbon dioxide sensors Sc1 and Sc2 detect the carbon dioxide concentration in the room. The carbon dioxide sensor Sc1 detects the carbon dioxide concentration in the first chamber A1. The carbon dioxide sensor Sc2 detects the carbon dioxide concentration in the second chamber A2.

[0020] The outside air temperature sensor So detects the temperature of the outside air. The detected values ​​of the inside air temperature sensors Si1 and Si2, the outside air temperature sensor So, and the carbon dioxide sensors Sc1 and Sc2 are input to the control device 13.

[0021] The ventilation devices 9 and 11 introduce outside air into the room. The operation of the ventilation devices 9 and 11 is controlled by the control device 13. That is, the amount of outside air introduced by the ventilation devices 9 and 11 (hereinafter referred to as the introduction amount) is controlled by the control device 13. The ventilation device 9 introduces outside air into the first room A1. The ventilation device 11 introduces outside air into the second room A2.

[0022] As shown in FIG. 2, the control device 13 uses the detection values ​​of the indoor air temperature sensors Si1 and Si2, the outdoor air temperature sensor So, and the carbon dioxide sensors Sc1 and Sc2 to control the operation of the indoor units 3 and 5, the outdoor unit 7, and the ventilators 9 and 11 according to a predetermined program.

[0023] The control device 13 is a computer-controlled controller having a CPU, a ROM, a RAM, etc. Software for executing the above programs is stored in advance in a non-volatile storage device (not shown) such as a ROM.

[0024] <2. Air conditioning system operation> The control device 13 according to this embodiment can execute at least a normal control mode, a thermo-off control mode, a thermo-on control mode, and a ventilation-linked control mode.

[0025] <2.1 Normal control mode> The control device 13 uses at least the temperature detected by the indoor air temperature sensor Si1 to increase or decrease the magnitude of the air conditioning capacity (hereinafter referred to as the generated capacity) generated in the first indoor unit 3. The air conditioning capacity generated in the first indoor unit 3 is the cold or hot heat generated in the indoor heat exchanger 3A.

[0026] That is, the control device 13 causes the indoor heat exchanger 3A to generate cold heat during cooling operation, and causes the indoor heat exchanger 3A to generate hot heat during heating operation. The control device 13 controls the air conditioning capacity generated in the first indoor unit 3 by adjusting the opening degree of the pressure reducer 3C and the rotation speed of the compressor 7A.

[0027] That is, the control device 13 controls the generating capacity and the amount of air blown so that the detected indoor temperature becomes the set temperature. The set temperature is a target indoor air temperature set in advance for the first room A1.

[0028] During cooling operation, when the indoor temperature is higher than the set temperature, the control device 13 increases the generating capacity by, for example, increasing the rotation speed of the compressor 7A. During cooling operation, when the indoor temperature is lower than the set temperature, the control device 13 decreases the generating capacity by, for example, decreasing the rotation speed of the compressor 7A.

[0029] Furthermore, during heating operation, when the room temperature is lower than the set temperature, the control device 13 increases the generating capacity by, for example, increasing the rotation speed of the compressor 7A. During heating operation, when the room temperature is higher than the set temperature, the control device 13 decreases the generating capacity by, for example, decreasing the rotation speed of the compressor 7A.

[0030] The control device 13 operates the ventilation device 9 in conjunction with the start of cooling operation or heating operation. In this embodiment, the amount of outside air introduced by the ventilation device 9 is, in principle, constant. When the concentration detected by the carbon dioxide sensor Sc1 exceeds a predetermined concentration, the control device 13 increases the amount of outside air introduced.

[0031] In the normal control mode for the second room A2, at least the temperature detected by the inside air temperature sensor Si2 is used to increase or decrease the generating capacity of the second indoor unit 5. The details of the control are the same as in the normal control mode for the first room A1.

[0032] The set temperature for the second room A2 is a target room temperature that is set separately from the set temperature for the first room A1. In other words, the set temperature for the first room A1 and the set temperature for the second room A2 may be the same or different.

[0033] <2.2 Thermo-off control and thermo-on control> Thermo-off control is control that stops the vapor compression refrigerator (compressor 7A in this embodiment) when the generating capacity reaches a predetermined lower limit value during execution of the normal control mode.

[0034] Specifically, the thermo-off control according to this embodiment stops the compressor 7A when the duration during which the generating capacity of both the first indoor unit 3 and the generating capacity of the second indoor unit 5 remain below the lower limit exceeds a predetermined time, with the reference time being the time when both the generating capacity of the first indoor unit 3 and the generating capacity of the second indoor unit 5 reach their lower limit values.

[0035] In other words, when one of the two generating capacities is at the lower limit and the other is above the lower limit, or when the duration during which the two generating capacities are below the lower limit is less than the above-mentioned time, thermo-off control is not executed.

[0036] In addition, the state in which the generating capacity reaches the lower limit during cooling operation refers to a state in which the detected indoor temperature is below a predetermined temperature and the rotation speed of compressor 7A reaches the predetermined lower limit rotation speed.

[0037] The state in which the generating capacity reaches the lower limit during heating operation refers to a state in which the detected indoor temperature is higher than a predetermined temperature and the rotation speed of the compressor 7A reaches the predetermined lower limit rotation speed.

[0038] The predetermined temperature during cooling operation is lower than the predetermined temperature during heating operation. The predetermined lower limit rotation speed during cooling operation is the same as the predetermined lower limit rotation speed during heating operation. Hereinafter, the above "predetermined temperature" will be referred to as the thermo-off temperature.

[0039] As described above, for example, if the generating capacity of one indoor unit reaches its lower limit and the generating capacity of the other indoor unit exceeds the lower limit, the thermo-off control is not executed. Then, when the generating capacity remains at the lower limit for more than the above-mentioned time, the control unit 5 according to this embodiment closes the pressure reducer of the indoor unit whose generating capacity is at the lower limit.

[0040] As a result, the generating capacity of the indoor unit, which had been at the lower limit, becomes essentially 0. Then, when the generating capacity of the indoor unit, which had been above the lower limit, drops to the lower limit and remains at the lower limit for longer than the above-mentioned time, the control device 13 stops the compressor 7A.

[0041] During cooling operation, the control device 13 executes thermo-on control to start the compressor 7A when at least one of the temperatures detected by the inside air temperature sensors Si1 and Si2 exceeds the corresponding set temperature.

[0042] During heating operation, the control device 13 executes thermo-on control to start the compressor 7A when at least one of the temperatures detected by the inside air temperature sensors Si1, Si2 becomes lower than the corresponding set temperature.

[0043] <2.3 Ventilation linked control mode> The ventilation interlocking control mode is a control for increasing the amount of outside air introduced compared to the amount immediately before the ventilation interlocking control mode is executed. The ventilation interlocking control mode is executed at the following timing.

[0044] <Execution timing during cooling operation> The control device 13 executes the ventilation linked control mode when the outside air temperature is higher than the inside air temperature and the temperature difference is equal to or greater than a predetermined temperature difference, and when it is possible to consider that the generation capacity has fallen below a predetermined generation capacity (hereinafter referred to as the start capacity) that is equal to or greater than a lower limit value.

[0045] Specifically, when the generating capacity of the second indoor unit 5 reaches its lower limit and the generating capacity of the first indoor unit 3 is above the lower limit, the detected temperature of the outdoor air temperature sensor So is higher than the detected temperature of the indoor air temperature sensor Si1 and the temperature difference is equal to or greater than a predetermined temperature difference, and it is possible to consider that the generating capacity of the first indoor unit 3 has fallen below the starting capacity, the control device 13 executes the ventilation linked control mode.

[0046] Furthermore, when the generating capacity of the first indoor unit 3 reaches its lower limit and the generating capacity of the second indoor unit 5 is above the lower limit, the outdoor air temperature is higher than the temperature detected by the indoor air temperature sensor Si2, and the temperature difference is equal to or greater than a predetermined temperature difference, and the generating capacity of the second indoor unit 5 can be considered to be below the starting capacity, the control device 13 executes the ventilation linked control mode.

[0047] <Execution timing during heating operation> The control device 13 executes the ventilation interlocking control mode when the outdoor air temperature is lower than the indoor air temperature and the temperature difference is equal to or greater than a predetermined temperature difference, and when the generation capacity of the first indoor unit 3 can be considered to be equal to or less than the starting capacity.

[0048] Specifically, when the generating capacity of the second indoor unit 5 reaches its lower limit and the generating capacity of the first indoor unit 3 is above the lower limit, the outdoor air temperature is lower than the temperature detected by the indoor air temperature sensor Si1 and the temperature difference is equal to or greater than a predetermined temperature difference, and the generating capacity of the first indoor unit 3 can be considered to be below the starting capacity, the control device 13 executes the ventilation linked control mode.

[0049] Furthermore, when the generating capacity of the first indoor unit 3 reaches its lower limit and the generating capacity of the second indoor unit 5 exceeds the lower limit, the outdoor air temperature is lower than the temperature detected by the indoor air temperature sensor Si2, and the temperature difference is equal to or greater than a predetermined temperature difference, and the generating capacity of the second indoor unit 5 can be considered to be equal to or less than the starting capacity, the control device 13 executes the ventilation linked control mode.

[0050] <Timing for stopping ventilation interlock control mode> When the generation capacity reaches or exceeds a predetermined capacity that is greater than the starting capacity, the control device 13 stops the ventilation-linked control mode and returns the air conditioner 1 to the normal control mode.

[0051] <Details on the timing of running and stopping the ventilation interlock control mode> Figure 3 is an example of a flowchart showing the execution and stop of the ventilation interlock control mode during cooling operation when the generating capacity of the second indoor unit 5 is at its lower limit and the generating capacity of the first indoor unit 3 is above the lower limit (hereinafter referred to as the ventilation interlock preparation state).

[0052] The control shown in the flowchart of FIG. 3 is repeatedly executed while in the ventilation interlock preparation state, but is not executed in the normal control mode. When the ventilation interlock preparation state is entered, the control device 13 determines whether the temperature detected by the inside air temperature sensor Si1 (hereinafter referred to as the measured temperature) is equal to or lower than the thermo-off temperature during cooling operation (hereinafter simply referred to as the thermo-off temperature) (S1).

[0053] If it is determined that the measured temperature is not equal to or lower than the thermo-off temperature (S1: NO), the control device 13 terminates this control and then starts this control again.If it is determined that the measured temperature is equal to or lower than the thermo-off temperature (S1: YES), the control device 13 determines whether the current rotation speed of the compressor 7A is the minimum rotation speed (S2).

[0054] In this embodiment, the electric motor (not shown) that drives the compressor 7A is controlled by an inverter. Therefore, the control device 13 determines the rotation speed of the compressor 7A using the drive frequency of the inverter. The minimum rotation speed, i.e., the minimum frequency, is the drive frequency that corresponds to the above-mentioned lower limit.

[0055] If the current rotation speed of the compressor 7A is not the minimum rotation speed (S2: NO), the control device 13 terminates this control and then starts this control again.If the current rotation speed of the compressor 7A is the minimum rotation speed (S2: YES), the control device 13 determines whether the thermo-off temperature is lower than the temperature detected by the outside air temperature sensor So (hereinafter referred to as the outside air temperature) (S3).

[0056] Since the actual measured temperature is equal to or lower than the thermo-off temperature, if the thermo-off temperature is lower than the outside air temperature, the outside air temperature is higher than the actual measured temperature. If the thermo-off temperature is lower than the outside air temperature, the control device 13 increases the amount of outside air introduced (S4).

[0057] If the thermo-off temperature is not lower than the outside air temperature, the control device 13 executes a thermo-off determination (S5). The thermo-off determination means determining whether or not the following conditions are met: "The measured temperature is equal to or lower than the thermo-off temperature, and the drive frequency is at the minimum frequency, and this state continues for a predetermined period of time."

[0058] If it is determined that the requirements for thermo-off determination are not met (S5: NO), the control device 13 terminates this control and then starts this control again.If it is determined that the requirements for thermo-off determination are met (S5: YES), the control device 13 executes thermo-off control (S6).

[0059] After increasing the amount of outside air introduced (S4), the control device 13 determines whether the measured temperature is equal to or lower than the set temperature (S7). If the measured temperature is equal to or lower than the set temperature (S7: YES), the control device 13 determines whether the drive frequency is the minimum frequency (S8).

[0060] If the drive frequency is the lowest frequency (S8: YES), the control device 13 executes a thermo-off determination (S9). If it is determined that the requirements for the thermo-off determination are met (S9: YES), the control device 13 executes a thermo-off control (S10).

[0061] If the measured temperature is not below the set temperature (S7: NO), or if the drive frequency is the lowest frequency (S8: NO), the control device 13 reduces the amount of introduction that was increased in S4 to the original amount of introduction (S11).

[0062] 3. Features of the Air Conditioner According to the Present Embodiment (See FIGS. 4A to 4C) In the air conditioner according to this embodiment, when the outdoor air temperature is higher than the indoor air temperature and the temperature difference is equal to or greater than a predetermined temperature difference during cooling operation, and the generating capacity of the indoor units 3, 5 can be considered to have fallen below a predetermined generating capacity that is equal to or greater than a lower limit, ventilation-linked control can be executed to increase the amount of outdoor air introduced compared to before. This makes it possible to prevent the indoor units 3, 5 from stopping while preventing the vapor compression refrigeration machine from stopping.

[0063] Similarly, in the air conditioner according to this embodiment, when the outdoor air temperature is lower than the indoor air temperature and the temperature difference is equal to or greater than a predetermined temperature difference during heating operation, and when the generation capacity of the indoor units 3, 5 can be considered to be equal to or less than a predetermined generation capacity that is equal to or greater than a lower limit, ventilation-linked control can be executed to increase the amount of outdoor air introduced compared to before. This makes it possible to prevent the indoor units 3, 5 from stopping while preventing the vapor compression refrigeration machine from stopping.

[0064] (Second embodiment) In the above-described embodiment, only one of the indoor units 3 and 5 exerts its air conditioning capacity, and the other indoor units are in a state where they are not actually exerting their air conditioning capacity, which is the ventilation linkage preparation state.

[0065] In contrast, this embodiment is an example of control that is executed when two or more indoor units satisfy the above-mentioned S3. That is, the control unit 5 according to this embodiment executes ventilation interlock control by giving priority to the ventilator that is in charge of the room with the highest carbon dioxide concentration among two or more rooms.

[0066] That is, when both the first indoor unit 3 and the second indoor unit 5 are in a state that satisfies S3 above, the control device 13 executes ventilation interlocking control on the ventilator responsible for the room with a high carbon dioxide concentration.

[0067] This can prevent the vapor compression refrigerator and the indoor units 3 and 5 from stopping, while also preventing an increase in the carbon dioxide concentration. (Other embodiments) In the second embodiment described above, when both the first indoor unit 3 and the second indoor unit 5 are in a state that satisfies S3, ventilation interlocking control is executed on the ventilator that is responsible for the room with a high carbon dioxide concentration. However, the present disclosure is not limited to this.

[0068] That is, according to the disclosure, even if neither the first indoor unit 3 nor the second indoor unit 5 satisfies S3, the amount of outside air introduced by the ventilation device in charge of the room with a high carbon dioxide concentration may be increased. This can prevent the thermo-off control from being executed.

[0069] In the above-described embodiment, the carbon dioxide sensors Sc1 and Sc2 directly detect the carbon dioxide concentration. However, the present disclosure is not limited to this. That is, the present disclosure may, for example, count the number of people in a room using a camera or the like, and indirectly detect the carbon dioxide concentration using the number of people. In other words, since the carbon dioxide concentration increases as the number of people increases, the carbon dioxide concentration may be indirectly detected using the number of people.

[0070] In the above-described embodiment, the amount of introduced air increased by the ventilation-linked control is a predetermined amount. However, the present disclosure is not limited to this. That is, the present disclosure may be configured such that the amount of introduced air increased is changed depending on the carbon dioxide concentration immediately before the execution of the ventilation-linked control.

[0071] The flowchart (FIG. 3) according to the above embodiment includes steps S7 and S8. However, the present disclosure is not limited to this. That is, the present disclosure may also include a control in which, for example, either S7 or S8 is omitted.

[0072] In the above-described embodiment, the indoor units 3, 5 and the ventilation device 9 are controlled by a single control device 13. However, the present disclosure is not limited to this. That is, the present disclosure may be configured to include, for example, a control unit that controls the indoor units 3, 5 and a control unit that controls the ventilation device 9, and these control units may cooperate to perform control.

[0073] The indoor units 3 and 5 according to the above-described embodiments constitute a vapor compression refrigeration machine together with the outdoor unit 7. However, the present disclosure is not limited to this. That is, the present disclosure may also be a system in which cold or hot heat generated by a heat source machine is supplied to the indoor units 3 and 5 as a fluid, for example.

[0074] Furthermore, the present disclosure is not limited to the above-described embodiments as long as it conforms to the spirit of the disclosure described in the above-described embodiments. Therefore, the present disclosure may be a configuration in which at least two of the above-described embodiments are combined, or a configuration in which any of the components illustrated or described with reference numerals in the above-described embodiments is eliminated. [Explanation of symbols]

[0075] 1...air conditioning device, 3...first indoor unit, 5...second indoor unit, 7...outdoor unit, 9...ventilation device, 11...ventilation device, 13...control device, Sc1...carbon dioxide sensor, Sc2...carbon dioxide sensor, Si1...inside air temperature sensor, Si2...inside air temperature sensor, So...outside air temperature sensor.

Claims

1. an indoor unit that performs air conditioning in a room, the indoor unit using cold heat generated by a vapor compression refrigeration unit (hereinafter referred to as air conditioning capacity); an indoor air temperature sensor for detecting the indoor air temperature; an outside air temperature sensor that detects the temperature of the air outside the room; a first control unit that controls the increase or decrease of the magnitude of the air conditioning capacity (hereinafter referred to as the generation capacity) by using at least the temperature detected by the inside air temperature sensor, and that is capable of executing thermo-off control that stops the vapor compression refrigeration machine when the generation capacity reaches a predetermined lower limit value; a ventilation device that introduces outside air into the room; a second control unit that controls the amount of outdoor air introduced by the ventilation device (hereinafter referred to as the introduction amount), and that is capable of performing ventilation-linked control; the ventilation interlocking control is a control that increases the introduction amount compared to immediately before the ventilation interlocking control is executed, Furthermore, the ventilation interlocking control is executed by the air conditioning device when the temperature detected by the outside air temperature sensor is higher than the temperature detected by the inside air temperature sensor and the temperature difference is equal to or greater than a predetermined temperature difference, and when it is possible to consider that the generation capacity has become equal to or less than a predetermined generation capacity (hereinafter referred to as the start capacity) that is equal to or greater than the lower limit value.

2. an indoor unit that performs air conditioning in a room, the indoor unit utilizing heat generated by a vapor compression refrigeration unit (hereinafter referred to as air conditioning capacity); an indoor air temperature sensor for detecting the indoor air temperature; an outside air temperature sensor that detects the temperature of the air outside the room; a first control unit that increases or decreases the magnitude of the air conditioning capacity (hereinafter referred to as "generation capacity") by utilizing at least the temperature detected by the inside air temperature sensor, and that is capable of executing thermo-off control that stops the vapor compression refrigeration machine when the generation capacity reaches a predetermined lower limit value; a ventilation device that introduces outside air into the room; a second control unit that controls the amount of outdoor air introduced by the ventilation device (hereinafter referred to as the introduction amount), and that is capable of performing ventilation-linked control; the ventilation interlocking control is a control that increases the introduction amount compared to immediately before the ventilation interlocking control is executed, Furthermore, the ventilation linkage control is executed by the air conditioning device when the temperature detected by the outside air temperature sensor is lower than the temperature detected by the inside air temperature sensor and the temperature difference is equal to or greater than a predetermined temperature difference, and when it is possible to consider that the generation capacity has become equal to or less than a predetermined generation capacity (hereinafter referred to as the start capacity) that is equal to or greater than the lower limit value.

3. The air conditioning device according to claim 1 or 2, wherein the second control unit stops the ventilation interlocking control when the generating capacity reaches or exceeds a predetermined capacity that is greater than the starting capacity.

4. The system is provided with two or more ventilation devices and a plurality of carbon dioxide sensors that detect the carbon dioxide concentration in the ventilation target space that each of the ventilation devices is responsible for, The air conditioning device according to claim 3, wherein when executing the ventilation interlocking control, the second control unit is capable of executing the ventilation interlocking control by giving priority to the ventilation device that is responsible for the ventilation target space with the highest carbon dioxide concentration among two or more ventilation target spaces.

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