Air conditioner, control method of air conditioner, program, and computer readable storage medium

Abstract

To provide an air conditioner which can efficiently adjust the ventilatory capacity of a ventilation device.SOLUTION: An air conditioner includes a ventilation device which ventilates the inside of a room, and a control device which controls the ventilation device. The control device acquires information related to a pressure in the inside of the room, and adjusts a ventilatory capacity of the ventilation device on the basis of the information related to the pressure in the inside of the room.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present disclosure relates to an air conditioner, a control method for an air conditioner, a program, and a computer-readable storage medium. [Background technology]

[0002] Patent Document 1 discloses an air conditioner that controls a fan motor to adjust the ventilation air volume so that the indoor humidity approaches a set indoor target humidity. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2007-187334 Summary of the Invention [Problem to be solved by the invention]

[0004] In recent years, there has been a demand for efficient adjustment of ventilation capacity in air conditioners equipped with ventilation devices.

[0005] Therefore, an object of the present disclosure is to provide an air conditioner that can efficiently adjust ventilation capacity, an air conditioner control method, a program, and a computer-readable storage medium. [Means for solving the problem]

[0006] In order to solve the above-mentioned problems, according to one aspect of the present disclosure, A ventilation system for ventilating the room; a control device for controlling the ventilation device; Equipped with The control device obtaining information about the pressure in the chamber; adjusting the ventilation capacity of the ventilation device based on information about the pressure in the room; An air conditioner is provided.

[0007] According to one aspect of the present disclosure, A control method for an air conditioner equipped with a ventilation device that ventilates a room, obtaining information about the pressure in the chamber; adjusting the ventilation capacity of the ventilation device based on information about the pressure in the room; Including, A method for controlling an air conditioner is provided.

[0008] According to one aspect of the present disclosure, A program for causing an air conditioner to execute the above-described control method is provided.

[0009] According to one aspect of the present disclosure, A computer-readable storage medium is provided that stores a program for causing an air conditioner to execute the above-described control method. [Effects of the Invention]

[0010] According to the present disclosure, it is possible to provide an air conditioner that can efficiently adjust ventilation capacity, a control method for an air conditioner, a program, and a computer-readable storage medium. [Brief explanation of the drawings]

[0011] [Figure 1] Schematic diagram of an air conditioner according to a first embodiment of the present disclosure. [Figure 2] FIG. 1 is a schematic block diagram showing the main configuration of an air conditioner according to a first embodiment of the present disclosure. [Figure 3] Flowchart of control of the air conditioner according to the first embodiment of the present disclosure [Figure 4] Flowchart of control of the air conditioner according to the first embodiment of the present disclosure [Figure 5] Timing chart of control of the air conditioner according to the first embodiment of the present disclosure [Figure 6] Another timing chart of control of the air conditioner according to the first embodiment of the present disclosure. [Figure 7]Timing chart of control of air conditioner according to Modification 1 [Figure 8] 1 is a schematic block diagram showing the main configuration of an air conditioner according to a second embodiment of the present disclosure. [Figure 9] Flowchart of control of an air conditioner according to a second embodiment of the present disclosure [Figure 10] Flowchart of control of an air conditioner according to a second embodiment of the present disclosure [Figure 11] Timing chart of control of an air conditioner according to a second embodiment of the present disclosure [Figure 12] Another timing chart of control of the air conditioner according to the second embodiment of the present disclosure. [Figure 13] Flowchart of control of air conditioner according to Modification 2 [Figure 14] Flowchart of control of air conditioner according to Modification 2 [Figure 15] Timing chart of control of air conditioner according to Modification 2 [Figure 16] Another timing chart for controlling the air conditioner according to Modification 2 [Figure 17] 10 is a schematic block diagram showing the main configuration of an air conditioner according to a third embodiment of the present disclosure. [Figure 18] Flowchart of control of an air conditioner according to a third embodiment of the present disclosure [Figure 19] Flowchart of control of an air conditioner according to a third embodiment of the present disclosure [Figure 20] Timing chart of control of an air conditioner according to a third embodiment of the present disclosure [Figure 21] Another timing chart of control of the air conditioner according to the third embodiment of the present disclosure. [Figure 22] FIG. 10 is a schematic block diagram showing the main configuration of an air conditioner according to a fourth embodiment of the present disclosure. [Figure 23] Flowchart of control of an air conditioner according to a fourth embodiment of the present disclosure [Figure 24] Flowchart of control of an air conditioner according to a fourth embodiment of the present disclosure [Figure 25]Timing chart of control of an air conditioner according to a fourth embodiment of the present disclosure [Figure 26] Another timing chart of control of the air conditioner according to the fourth embodiment of the present disclosure. [Figure 27] 10 is a schematic block diagram showing the main configuration of an air conditioner according to a fifth embodiment of the present disclosure. [Figure 28] Flowchart of control of an air conditioner according to a fifth embodiment of the present disclosure [Figure 29] Flowchart of control of an air conditioner according to a fifth embodiment of the present disclosure [Figure 30] Timing chart of control of an air conditioner according to a fifth embodiment of the present disclosure [Figure 31] Timing chart of control of air conditioner according to Modification 3 DETAILED DESCRIPTION OF THE INVENTION

[0012] Hereinafter, an embodiment of the present disclosure will be described with reference to the drawings.

[0013] It should be noted that, in this specification, terms such as "first," "second," etc. are used for descriptive purposes only and should not be understood as expressing or implying the relative importance or ranking of technical features. Features qualified as "first" and "second" expressly or imply the inclusion of one or more of such features.

[0014] (Embodiment 1) Fig. 1 is a schematic diagram of an air conditioner according to a first embodiment of the present disclosure, and Fig. 2 is a schematic block diagram showing the main configuration of the air conditioner according to the first embodiment of the present disclosure.

[0015] As shown in Fig. 1, the air conditioner 10 according to this embodiment comprises an indoor unit 20 arranged in the room Rin to be air-conditioned, an outdoor unit 30 arranged in the outdoor Rout, and a ventilation device 50 arranged in the outdoor Rout. Furthermore, as shown in Fig. 2, the air conditioner 10 comprises a control device 60 and a first pressure sensor 70.

[0016] The indoor unit 20 is provided with an indoor heat exchanger 22 that exchanges heat with the indoor air A1, and a fan 24 that draws the indoor air A1 into the indoor unit 20 and blows the indoor air A1 into the room Rin after heat exchange with the indoor heat exchanger 22.

[0017] The outdoor unit 30 is provided with an outdoor heat exchanger 32 that exchanges heat with outdoor air A2, and a fan 34 that draws the outdoor air A2 into the outdoor unit 30 and blows the outdoor air A2 out to the outdoor Rout after exchanging heat with the outdoor heat exchanger 32. The outdoor unit 30 is also provided with a compressor 36, an expansion valve 38, and a four-way valve 40 that execute a refrigeration cycle with the indoor heat exchanger 22 and the outdoor heat exchanger 32.

[0018] The indoor heat exchanger 22, the outdoor heat exchanger 32, the compressor 36, the expansion valve 38, and the four-way valve 40 are each connected by a refrigerant pipe through which a refrigerant flows. In cooling operation and dehumidification operation (weak cooling operation), the air conditioner 10 executes a refrigeration cycle in which the refrigerant flows from the compressor 36 through the four-way valve 40, the outdoor heat exchanger 32, the expansion valve 38, and the indoor heat exchanger 22 in that order, before returning to the compressor 36. In heating operation, the air conditioner 10 executes a refrigeration cycle in which the refrigerant flows from the compressor 36 through the four-way valve 40, the indoor heat exchanger 22, the expansion valve 38, and the outdoor heat exchanger 32 in that order, before returning to the compressor 36.

[0019] The ventilation device 50 ventilates the room Rin. The ventilation device 50 performs, for example, supply ventilation and exhaust ventilation. The supply ventilation blows outdoor air A3 from the outdoor Rout to the room Rin. The exhaust ventilation blows room air A4 from the room Rin to the outdoor Rout.

[0020] The ventilation device 50 is connected to the indoor unit 20 via a ventilation duct 52. The ventilation duct 52 connects the indoor Rin and the outdoor Rout. One end of the ventilation duct 52 is arranged on the indoor Rin side. The other end of the ventilation duct 52 is arranged on the outdoor Rout side. In supply ventilation, the ventilation device 50 supplies outdoor air A3 to the indoor unit 20 via the ventilation duct 52. This supplies the outdoor air A3 to the indoor Rin. In exhaust ventilation, the ventilation device 50 exhausts indoor air A4 to the outdoor Rout via the ventilation duct 52.

[0021] The control device 60 includes, for example, a memory that stores a program and a processing circuit corresponding to a processor such as a CPU (Central Processing Unit). The functions of the control device 60 may be configured solely by hardware, or may be realized by combining hardware and software. The control device 60 realizes predetermined functions by reading data and programs stored in the memory and performing various arithmetic processing.

[0022] The control device 60 controls the components of the air conditioner 10. In this embodiment, the control device 60 controls the indoor unit 20, the outdoor unit 30, and the ventilation device 50.

[0023] The first pressure sensor 70 detects the indoor pressure Pin in the room Rin. For example, the first pressure sensor 70 is disposed in the indoor unit 20. Information detected by the first pressure sensor 70 is transmitted to the control device 60.

[0024] 3 and 4 are flowcharts of control of the air conditioner according to the first embodiment of the present disclosure.

[0025] As shown in FIG. 3, the control device 60 of the air conditioner 10 executes steps S10 and S20.

[0026] In step S10, the control device 60 acquires information about the pressure in the room Rin.

[0027] The information related to the pressure of the room Rin may be information that is directly or indirectly related to the room pressure Pin of the room Rin. For example, the information related to the pressure of the room Rin may be the room pressure Pin itself, or the pressure difference between the room Rin and the outdoor Rout. Alternatively, the information related to the pressure of the room Rin may be information that affects the room pressure Pin. For example, the information related to the pressure of the room Rin may be information that allows the room pressure Pin to be estimated, or information that allows the pressure difference between the room Rin and the outdoor Rout to be estimated. For example, the information related to the pressure of the room Rin may be temperature or humidity.

[0028] In this embodiment, the information about the pressure of the room Rin is the room pressure Pin itself detected by the first pressure sensor 70. That is, in step S10, the control device 60 acquires the room pressure Pin detected by the first pressure sensor 70.

[0029] The indoor pressure Pin may be an average value of the indoor pressure Pin over a predetermined time period, or may be a median value of the indoor pressure Pin over a predetermined time period.

[0030] In step S20, the control device 60 adjusts the ventilation capacity of the ventilation device 50 based on information about the pressure of the room Rin. Specifically, the control device 60 adjusts the ventilation capacity of the ventilation device 50 based on the room pressure Pin detected by the first pressure sensor 70.

[0031] The ventilation capacity includes, for example, the ventilation volume, the air blowing pressure, etc. In this embodiment, the control device 60 adjusts the ventilation volume of the ventilation device 50 based on the indoor pressure Pin. Specifically, the ventilation device 50 is equipped with a ventilation fan that blows air. The control device 60 adjusts the ventilation volume by adjusting the rotation speed of the ventilation fan of the ventilation device 50. Note that the ventilation capacity may be any parameter related to ventilation.

[0032] As shown in FIG. 4, step S20 includes steps S21 and S22.

[0033] In step S21, the control device 60 acquires the first threshold value T1. For example, the control device 60 reads out the first threshold value T1 stored in a memory.

[0034] The first threshold value T1 is a reference value of the indoor pressure Pin for adjusting the ventilation capacity of the ventilation device 50. The first threshold value T1 is, for example, the pressure of the indoor pressure Rin when the air conditioner 10 is not operating. Specifically, when the air conditioner 10 is not operating, the first pressure sensor 70 acquires the pressure of the indoor pressure Rin. The control device 60 determines the acquired pressure of the indoor pressure Rin as the first threshold value T1 and stores it in memory.

[0035] The first threshold value T1 is not limited to the pressure of the indoor air Rin when the air conditioner 10 is not operating. For example, the first threshold value T1 may be calculated using the pressure of the indoor air Rin when the air conditioner 10 is not operating and a correction coefficient. Alternatively, the first threshold value T1 may be a value determined in advance, or may be a value set by the user.

[0036] In step S22, the control device 60 adjusts the ventilation capacity based on the indoor pressure Pin and the first threshold value T1.

[0037] For example, the control device 60 adjusts the ventilation volume of the ventilation device 50 based on the difference between the indoor pressure Pin and the first threshold value T1.

[0038] Fig. 5 is a timing chart of control of the air conditioner according to the first embodiment of the present disclosure. Fig. 5 shows an example of adjustment of ventilation capacity based on the indoor pressure Pin and the first threshold value T1 while the indoor pressure Rin is positive and the ventilation device 50 is performing supply ventilation.

[0039] As shown in Figure 5, the control device 60 adjusts the ventilation rate of supply air ventilation in response to fluctuations in the indoor pressure Pin. For example, when the indoor pressure Pin moves away from the first threshold value T1 so that it is smaller than the first threshold value T1, the control device 60 increases the ventilation rate of supply air ventilation by the ventilation device 50. On the other hand, when the indoor pressure Pin approaches the first threshold value T1, the control device 60 decreases the ventilation rate of supply air ventilation by the ventilation device 50. In other words, while the indoor pressure Pin is smaller than the first threshold value T1, when the difference between the indoor pressure Pin and the first threshold value T1 increases, the control device 60 increases the ventilation rate of supply air ventilation by the ventilation device 50. On the other hand, when the difference between the indoor pressure Pin and the first threshold value T1 decreases, the control device 60 decreases the ventilation rate of supply air ventilation by the ventilation device 50.

[0040] Fig. 6 is another timing chart of control of the air conditioner according to the first embodiment of the present disclosure. Fig. 6 shows an example of adjustment of ventilation capacity based on the indoor pressure Pin and the first threshold value T1 while the indoor pressure Rin is positive and the ventilation device 50 is performing exhaust ventilation.

[0041] As shown in Fig. 6, the control device 60 adjusts the ventilation rate of exhaust ventilation in accordance with fluctuations in the indoor pressure Pin. For example, when the indoor pressure Pin moves away from the first threshold value T1 in a direction that increases the ventilation rate of exhaust ventilation of the ventilation device 50. On the other hand, when the indoor pressure Pin approaches the first threshold value T1, the control device 60 decreases the ventilation rate of exhaust ventilation of the ventilation device 50. In other words, while the indoor pressure Pin is greater than the first threshold value T1, if the difference between the indoor pressure Pin and the first threshold value T1 increases, the control device 60 increases the ventilation rate of exhaust ventilation of the ventilation device 50. On the other hand, if the difference between the indoor pressure Pin and the first threshold value T1 decreases, the control device 60 decreases the ventilation rate of exhaust ventilation of the ventilation device 50.

[0042] Whether to perform supply ventilation or exhaust ventilation may be determined based on a user operation. For example, the user may be able to perform supply ventilation or exhaust ventilation by operating a remote controller of the air conditioner 10. Alternatively, the control device 60 may determine whether to perform supply ventilation or exhaust ventilation based on information related to the pressure of indoor Rin.

[0043] As described above, the air conditioner 10 of this embodiment includes the ventilation device 50 that ventilates the indoor Rin, and the control device 60 that controls the ventilation device 50. The control device 60 acquires information related to the pressure of the indoor Rin, and adjusts the ventilation capacity of the ventilation device 50 based on the information related to the pressure of the indoor Rin.

[0044] With this configuration, the air conditioner 10 equipped with the ventilation device 50 can efficiently adjust the ventilation capacity of the ventilation device 50. Specifically, the control device 60 can adjust the ventilation capacity in response to changes in the indoor pressure Pin. This reduces discomfort felt by the user due to changes in the indoor pressure Pin.

[0045] For example, when the ventilation device 50 ventilates the indoor Rin, the pressure of the indoor Rin may change due to the ventilation. For example, by performing supply ventilation, outdoor air A3 from the outdoor Rout is supplied to the indoor Rin. This may increase the pressure of the indoor Rin. Alternatively, by performing exhaust ventilation, the air of the indoor Rin is exhausted to the outdoor Rout. This may decrease the pressure of the indoor Rin. Such changes in the pressure of the indoor Rin may cause discomfort to the user. In the air conditioner 10 of this embodiment, the ventilation capacity is adjusted based on information related to the pressure of the indoor Rin, and therefore changes in the pressure of the indoor Rin due to ventilation can be suppressed.

[0046] Furthermore, even when the pressure of the indoor Rin changes due to an external disturbance, the air conditioner 10 of this embodiment can adjust the ventilation capacity based on information about the pressure of the indoor Rin. This makes it possible to suppress changes in the pressure of the indoor Rin due to external disturbances. External disturbances include, for example, the activation of other equipment such as a range hood or a ventilation fan, and the opening and closing of a door or window.

[0047] The information relating to the pressure of the room Rin includes the room pressure Pin of the room Rin. The control device 60 adjusts the ventilation capacity based on the room pressure Pin.

[0048] This configuration allows the ventilation capacity to be adjusted more efficiently based on the indoor pressure Pin.

[0049] The air conditioner 10 is equipped with a first pressure sensor that detects the indoor pressure Pin. The control device 60 adjusts the ventilation capacity based on the indoor pressure Pin detected by the first pressure sensor 70.

[0050] With this configuration, the indoor pressure Pin can be detected by the first pressure sensor 70. This allows the control device 60 to efficiently adjust the ventilation capacity based on the indoor pressure Pin detected by the first pressure sensor 70.

[0051] Note that, in the present embodiment, an example has been described in which the air conditioner 10 is equipped with the first pressure sensor 70, but this is not limiting. For example, if a pressure gauge separate from the air conditioner 10 is placed in the room Rin and the air conditioner 10 and the pressure gauge are connected via a network, the air conditioner 10 does not need to be equipped with the first pressure sensor 70. The air conditioner 10 may acquire the indoor pressure Pin obtained by the pressure gauge, and the air conditioner 10 may acquire information about the indoor pressure Pin from the pressure gauge via the network. Alternatively, the air conditioner 10 may be connected to the pressure gauge via a wired connection.

[0052] In the present embodiment, an example has been described in which the ventilation device 50 is capable of performing both supply ventilation and exhaust ventilation, but the present invention is not limited to this. For example, the ventilation device 50 may be capable of performing at least one of supply ventilation and exhaust ventilation.

[0053] Furthermore, when the control device 60 is capable of performing supply ventilation and exhaust ventilation, the control device 60 may switch between supply ventilation and exhaust ventilation based on information related to the pressure of the room Rin.

[0054] <Variation 1> In Modification 1, the control by the control device 60 to switch between supply ventilation and exhaust ventilation based on information about the pressure of the room Rin will be described with reference to FIG.

[0055] Fig. 7 is a timing chart of control of the air conditioner according to Modification 1. In Fig. 7, the room pressure Pin is used as an example of information relating to the pressure of the room Rin.

[0056] 7, in step S21, a first threshold value T1 is acquired. For example, the control device 60 reads out the first threshold value T1 stored in a memory. In the first modification, the first threshold value T1 is a reference value that serves as a criterion for switching between supply ventilation and exhaust ventilation.

[0057] In step S23, the control device 60 determines whether the indoor pressure Pin is greater than the first threshold value T1.

[0058] If the indoor pressure Pin is greater than the first threshold value T1, the process proceeds to step S24. In step S24, the control device 60 controls the ventilation device 50 to perform exhaust ventilation.

[0059] If the indoor pressure Pin is equal to or lower than the first threshold value T1, the process proceeds to step S25. In step S25, the control device 60 controls the ventilation device 50 to perform supply ventilation.

[0060] In step S22, the control device 60 adjusts the ventilation capacity based on the indoor pressure Pin and the first threshold value T1. For example, the control device 60 adjusts the ventilation volume of the ventilation device 50 so as to prevent the indoor pressure Pin from changing beyond the first threshold value T1.

[0061] This configuration allows for efficient adjustment of ventilation capacity and reduces the number of times the ventilation mode is switched.

[0062] (Embodiment 2) An air conditioner according to a second embodiment of the present disclosure will be described.

[0063] In the second embodiment, differences from the first embodiment will be mainly described. In the second embodiment, the same or equivalent configurations as those in the first embodiment will be denoted by the same reference numerals. Also, in the second embodiment, descriptions that overlap with those in the first embodiment will be omitted.

[0064] Fig. 8 is a schematic block diagram showing the main configuration of an air conditioner according to embodiment 2 of the present disclosure. Fig. 9 is a flowchart of control of the air conditioner according to embodiment 2 of the present disclosure. Fig. 10 is a flowchart of control of the air conditioner according to embodiment 2 of the present disclosure.

[0065] Embodiment 2 differs from Embodiment 1 in that the air conditioner 10A is equipped with a second pressure sensor 72 that detects the outdoor pressure Pout. Embodiment 2 also differs from Embodiment 1 in that the information related to the pressure of the indoor air Rin is the pressure difference Pd between the indoor air Rin and the outdoor air Rout, and the control device 60 switches between supply ventilation and exhaust ventilation based on the pressure difference Pd.

[0066] 8, the air conditioner 10A is provided with a second pressure sensor 72 that detects the outdoor pressure Pout of the outdoor area Rout. The second pressure sensor 72 detects the outdoor pressure Pout and transmits it to the control device 60.

[0067] In step S10 of the second embodiment, the control device 60 acquires the pressure difference Pd between the indoor pressure Pin detected by the first pressure sensor 70 and the outdoor pressure Pout detected by the second pressure sensor 72 as information related to the pressure of the room Rin.

[0068] As shown in FIG. 9, step S10 includes steps S11A to S13A.

[0069] In step S11A, the first pressure sensor 70 detects the indoor pressure Pin in the room Rin. The indoor pressure Pin detected by the first pressure sensor 70 is sent to the control device 60.

[0070] In step S12A, the second pressure sensor 72 detects the outdoor pressure Pout of the outdoor unit Rout. The outdoor pressure Pout detected by the second pressure sensor 72 is sent to the control device 60.

[0071] In step S13A, the controller 60 calculates the pressure difference Pd between the indoor pressure Rin and the outdoor pressure Rout. For example, the controller 60 calculates the pressure difference Pd by subtracting the outdoor pressure Pout from the indoor pressure Pin.

[0072] In step S20 of the second embodiment, the control device 60 adjusts the ventilation capacity of the ventilation device 50 based on the pressure difference Pd between the indoor pressure Rin and the outdoor pressure Rout.

[0073] As shown in FIG. 10, step S20 includes steps S21A to S22A.

[0074] In step S21A, the control device 60 determines whether the pressure difference Pd is equal to or greater than the second threshold value T2.

[0075] The second threshold value T2 is a reference value indicating the pressure difference for adjusting the ventilation capacity of the ventilation device 50. For example, the second threshold value T2 is set to a pressure difference value at which the indoor pressure Pin becomes positive relative to the outdoor pressure Pout. The second threshold value T2 is stored in memory.

[0076] The second threshold T2 may be a predetermined value or may be a value set by the user.

[0077] In step S21A, the control device 60 adjusts the ventilation capacity of the ventilation device 50 based on the pressure difference Pd and the second threshold value T2.

[0078] For example, the control device 60 adjusts the ventilation volume of the ventilation device 50 based on the difference between the pressure difference Pd and the second threshold value T2.

[0079] Fig. 11 is a timing chart of control of an air conditioner according to Embodiment 2 of the present disclosure. Fig. 11 shows an example of adjustment of ventilation capacity based on the pressure difference Pd and the second threshold value T2 while indoor Rin is at a positive pressure and ventilation device 50 is performing supply ventilation.

[0080] As shown in Figure 11, the control device 60 adjusts the ventilation rate of the supply air ventilation in response to fluctuations in the pressure difference Pd. For example, when the pressure difference Pd moves away from the second threshold value T2, the control device 60 increases the ventilation rate of the supply air ventilation of the ventilation device 50. On the other hand, when the pressure difference Pd approaches the second threshold value T2, the control device 60 decreases the ventilation rate of the supply air ventilation of the ventilation device 50. For example, while the pressure difference Pd is smaller than the second threshold value T2, if the difference between the pressure difference Pd and the second threshold value T2 increases, the control device 60 increases the ventilation rate of the supply air ventilation of the ventilation device 50. On the other hand, if the difference between the pressure difference Pd and the second threshold value T2 decreases, the control device 60 decreases the ventilation rate of the supply air ventilation of the ventilation device 50.

[0081] Fig. 12 is another timing chart of control of the air conditioner according to the second embodiment of the present disclosure. Fig. 12 shows an example of adjustment of the ventilation capacity based on the pressure difference Pd and the second threshold value T2 while the indoor Rin is at a positive pressure and the ventilation device 50 is performing exhaust ventilation.

[0082] As shown in Fig. 12, the control device 60 adjusts the ventilation rate of the exhaust ventilation in accordance with fluctuations in the pressure difference Pd. For example, when the pressure difference Pd moves away from the second threshold value T2, the control device 60 increases the ventilation rate of the exhaust ventilation of the ventilation device 50. On the other hand, when the pressure difference Pd approaches the second threshold value T2, the control device 60 decreases the ventilation rate of the exhaust ventilation of the ventilation device 50. For example, while the pressure difference Pd is greater than the second threshold value T2, if the difference between the pressure difference Pd and the second threshold value T2 increases, the control device 60 increases the ventilation rate of the exhaust ventilation of the ventilation device 50. On the other hand, if the difference between the pressure difference Pd and the second threshold value T2 decreases, the control device 60 decreases the ventilation rate of the exhaust ventilation of the ventilation device 50.

[0083] As described above, in the air conditioner 10A of the present embodiment, information about the pressure of the room Rin includes the pressure difference Pd between the room Rin and the outdoor Rout, and the control device 60 adjusts the ventilation capacity based on the pressure difference Pd.

[0084] With this configuration, the ventilation capacity can be efficiently adjusted based on the pressure difference Pd between the indoor Rin and outdoor Rout.

[0085] The air conditioner 10A is equipped with a first pressure sensor 70 that detects the indoor pressure Pin of the indoor room Rin, and a second pressure sensor 72 that detects the outdoor pressure Pout of the outdoor room Rout. The control device 60 calculates the pressure difference Pd between the indoor room Rin and the outdoor room Rout from the indoor pressure Pin detected by the first pressure sensor 70 and the outdoor pressure Pout detected by the second pressure sensor 72.

[0086] With this configuration, the indoor pressure Pin and the outdoor pressure Pout can be obtained by the first pressure sensor 70 and the second pressure sensor 72, so that the pressure difference Pd can be calculated accurately and easily.

[0087] Note that, in this embodiment, an example has been described in which the air conditioner 10A is equipped with the second pressure sensor 72, but this is not limiting. For example, if a pressure gauge separate from the air conditioner 10A is disposed in the outdoor Rout and the air conditioner 10A and the pressure gauge are connected via a network, the air conditioner 10A does not need to be equipped with the second pressure sensor 72. The air conditioner 10A may acquire the outdoor pressure Pout acquired by a pressure gauge, and the air conditioner 10A may acquire information about the outdoor pressure Pout from the pressure gauge via the network. Alternatively, the air conditioner 10A may acquire information about the outdoor pressure Pout via the network from a server that stores air pressure information. Alternatively, the air conditioner 10A may be connected to the pressure gauge via a wired connection.

[0088] Alternatively, the air conditioner 10A may be provided with a differential pressure sensor that detects the pressure difference between the indoor Rin and outdoor Rout.

[0089] In the present embodiment, the second threshold value T2 is an example of the pressure difference value at which the indoor pressure Pin becomes a positive pressure relative to the outdoor pressure Pout, but is not limited to this. For example, the second threshold value T2 may be a pressure difference value at which the indoor pressure Pin becomes a negative pressure relative to the outdoor pressure Pout.

[0090] <Variation 2> In Modification 2, the control by the control device 60 to switch between supply ventilation and exhaust ventilation based on information about the pressure of the room Rin will be described with reference to FIGS.

[0091] Fig. 13 is a flowchart of control of an air conditioner according to Modification 2. Fig. 14 is a flowchart of control of an air conditioner according to Modification 2. Fig. 15 is a timing chart of control of an air conditioner according to Modification 2. Fig. 16 is another timing chart of control of an air conditioner according to Modification 2. In Figs. 13 to 16, the pressure difference Pd between the indoor Rin and the outdoor Rout is used as an example of information relating to the pressure of the indoor Rin.

[0092] FIG. 13 shows an example of control for switching between supply ventilation and exhaust ventilation based on the pressure difference Pd, the third threshold value T3, and the fourth threshold value T4.

[0093] 13, in step S31, if the pressure difference Pd is equal to or greater than the third threshold value T3, the process proceeds to step S32. In step S32, the control device 60 controls the ventilation device 50 to perform exhaust ventilation.

[0094] The third threshold T3 is a reference value indicating the pressure difference at which the exhaust ventilation mode is switched to. For example, the third threshold T3 is set to a pressure difference value at which the indoor pressure Pin becomes positive relative to the outdoor pressure Pout. The third threshold T3 is stored in memory.

[0095] The third threshold T3 may be a predetermined value or may be a value set by the user.

[0096] If the pressure difference Pd is smaller than the third threshold value T3, the process proceeds to step S33. At this time, the control device 60 may maintain the current ventilation mode. For example, if the control device 60 is performing supply ventilation, the control device 60 may continue to perform supply ventilation.

[0097] In step S33, the control device 60 determines whether the pressure difference Pd is equal to or less than a fourth threshold value T4.

[0098] The fourth threshold T4 is a reference value indicating the pressure difference at which supply ventilation is switched on. The fourth threshold T4 is smaller than the third threshold T3. For example, the fourth threshold T4 is set to a pressure difference value at which the indoor pressure Pin becomes negative relative to the outdoor pressure Pout. The fourth threshold T4 is stored in memory.

[0099] The fourth threshold T4 may be a predetermined value or may be a value set by the user.

[0100] If the pressure difference Pd is equal to or less than the fourth threshold value T4, the process proceeds to step S34. In step S34, the control device 60 controls the ventilation device 50 to perform supply ventilation.

[0101] If the pressure difference Pd is greater than the fourth threshold T4, step S20 is terminated. At this time, the control device 60 may maintain the current ventilation mode. For example, if the control device 60 is performing exhaust ventilation, the control device 60 may continue to perform exhaust ventilation.

[0102] For example, the pressure difference Pd fluctuates between -15 Pa and +100 Pa. For example, when the range hood is operating, the indoor pressure Pin becomes relatively smaller than the outdoor pressure Pout, and the pressure difference Pd becomes between -15 Pa and -10 Pa. Alternatively, when a strong wind is blowing outdoors Rout, the indoor pressure Pin becomes relatively larger than the outdoor pressure Pout, and the pressure difference Pd becomes between +50 Pa and +100 Pa.

[0103] If the pressure difference Pd becomes large, it may cause discomfort to the user's ears. For example, if the pressure difference Pd becomes 50 Pa or greater, the user's ears may feel uncomfortable. Therefore, the third threshold T3 and the fourth threshold T4 may be determined so that the pressure difference Pd does not cause discomfort to the user's ears.

[0104] As shown in FIG. 14, step S20 in the second modification includes steps S21B to S23B.

[0105] In step S21B, the control device 60 determines whether the ventilation device 50 is performing supply ventilation or exhaust ventilation.

[0106] If the ventilation device 50 is performing supply ventilation, the process proceeds to step S22B. If the ventilation device 50 is performing exhaust ventilation, the process proceeds to step S23B.

[0107] In step S22B, while the ventilation device 50 is performing supply ventilation, the control device 60 adjusts the ventilation capacity based on the pressure difference Pd and the third threshold value T3.

[0108] FIG. 15 shows an example of adjusting the ventilation volume based on the pressure difference Pd and the third threshold value T3 while the ventilation device 50 is performing supply ventilation.

[0109] 15, when the pressure difference Pd is smaller than the third threshold T3, as the pressure difference Pd approaches the third threshold T3, the control device 60 reduces the ventilation rate of the supply ventilation of the ventilation device 50. On the other hand, as the pressure difference Pd moves away from the third threshold T3 in a direction that reduces the pressure difference Pd, the control device 60 increases the ventilation rate of the supply ventilation of the ventilation device 50. In other words, as the difference between the pressure difference Pd and the third threshold T3 increases while the pressure difference Pd is smaller than the third threshold T3, the control device 60 increases the ventilation rate of the supply ventilation of the ventilation device 50. On the other hand, as the difference between the pressure difference Pd and the third threshold T3 decreases, the control device 60 reduces the ventilation rate of the supply ventilation of the ventilation device 50.

[0110] In step S23B, while the ventilation device 50 is performing exhaust ventilation, the control device 60 adjusts the ventilation capacity based on the pressure difference Pd and the fourth threshold value T4.

[0111] FIG. 16 shows an example of adjusting the ventilation volume based on the pressure difference Pd and the fourth threshold value T4 while the ventilation device 50 is performing exhaust ventilation.

[0112] 16, when the pressure difference Pd is greater than the fourth threshold T4, as the pressure difference Pd approaches the fourth threshold T4, the control device 60 reduces the ventilation rate of the exhaust ventilation of the ventilation device 50. On the other hand, as the pressure difference Pd moves away from the fourth threshold T4 in a direction that increases the pressure difference Pd, the control device 60 increases the ventilation rate of the exhaust ventilation of the ventilation device 50. In other words, as long as the pressure difference Pd is greater than the fourth threshold T4, as the difference between the pressure difference Pd and the fourth threshold T4 increases, the control device 60 increases the ventilation rate of the exhaust ventilation of the ventilation device 50. On the other hand, as the difference between the pressure difference Pd and the fourth threshold T4 decreases, the control device 60 reduces the ventilation rate of the exhaust ventilation of the ventilation device 50.

[0113] In this way, the control device 60 may adjust the ventilation volume of the ventilation device 50 in accordance with the ventilation mode and fluctuations in the pressure difference Pd.

[0114] With this configuration, in the air conditioner 10A that performs control to switch the ventilation mode in accordance with the pressure difference Pd, it is possible to reduce the number of times the ventilation mode is switched.

[0115] In the second modification, an example has been described in which the third threshold T3 is a pressure difference value at which the indoor pressure Pin becomes a positive pressure relative to the outdoor pressure Pout, and the fourth threshold T4 is a pressure difference value at which the indoor pressure Pin becomes a negative pressure relative to the outdoor pressure Pout, but this is not limiting. For example, both the third threshold T3 and the fourth threshold T4 may be pressure difference values at which the indoor pressure Pin becomes a positive pressure relative to the outdoor pressure Pout. This allows the indoor pressure Pin to be maintained in a state greater than the outdoor pressure Pout. Alternatively, both the third threshold T3 and the fourth threshold T4 may be pressure difference values at which the indoor pressure Pin becomes a negative pressure relative to the outdoor pressure Pout. This allows the indoor pressure Pin to be maintained in a state smaller than the outdoor pressure.

[0116] In Modification 2, an example has been described in which the control device 60 switches between supply ventilation and exhaust ventilation using the third threshold value T3 and the fourth threshold value T4, but the present invention is not limited to this. For example, the control device 60 may switch between supply ventilation and exhaust ventilation based on one or more threshold values. Alternatively, the control device 60 may switch between supply ventilation and exhaust ventilation based on whether the pressure difference Pd is positive or negative. That is, the control device 60 may perform exhaust ventilation when the indoor pressure Pin is greater than the outdoor pressure Pout, and perform supply ventilation when the indoor pressure Pin is smaller than the outdoor pressure Pout.

[0117] (Embodiment 3) An air conditioner according to a third embodiment of the present disclosure will be described.

[0118] In the third embodiment, differences from the first embodiment will be mainly described. In the third embodiment, the same or equivalent configurations as those in the first embodiment will be denoted by the same reference numerals. Also, in the third embodiment, descriptions that overlap with those in the first embodiment will be omitted.

[0119] Fig. 17 is a schematic block diagram showing the main configuration of an air conditioner according to embodiment 3 of the present disclosure. Fig. 18 is a flowchart of control of an air conditioner according to embodiment 3 of the present disclosure. Fig. 19 is a flowchart of control of an air conditioner according to embodiment 3 of the present disclosure. Fig. 20 is a timing chart of control of an air conditioner according to embodiment 3 of the present disclosure. Fig. 21 is another timing chart of control of an air conditioner according to embodiment 3 of the present disclosure.

[0120] Embodiment 3 differs from Embodiment 1 in that the air conditioner 10B is equipped with a first temperature sensor 74 that detects the indoor temperature Tin of the indoor temperature Rin, and a second temperature sensor 76 that detects the outdoor temperature Tout of the outdoor temperature Rout. Embodiment 3 also differs from Embodiment 1 in that the information related to the pressure of the indoor temperature Rin is the temperature difference Td between the indoor temperature Rin and the outdoor temperature Rout caused by the pressure difference between the indoor temperature Rin and the outdoor temperature Rout, and the control device 60 adjusts the ventilation capacity of the ventilation device 50 based on the temperature difference Td.

[0121] The ventilation duct 52 spatially connects the indoor Rin and the outdoor Rout. Therefore, the outdoor air A3 moves from the outdoor Rout to the indoor Rin through the ventilation duct 52, and the indoor air A4 moves from the indoor Rin to the outdoor Rout through the ventilation duct 52. For example, when a pressure difference Pd occurs between the indoor Rin and the outdoor Rout, the pressure difference Pd causes the outdoor air A3 or the indoor air A4 to move through the ventilation duct 52.

[0122] For example, when the indoor pressure Pin is positive relative to the outdoor pressure Pout, the indoor air A4 moves from the indoor Rin to the outdoor Rout through the ventilation duct 52. When the indoor pressure Pin is negative relative to the outdoor pressure Pout, the outdoor air A3 moves from the outdoor Rout to the indoor Rin through the ventilation duct 52. As the outdoor air A3 or the indoor air A4 moves through the ventilation duct 52 due to the pressure difference Pd, the indoor temperature Tin or the outdoor temperature Tout fluctuates. Therefore, the pressure difference Pd can be estimated based on the temperature difference Td between the indoor temperature Tin and the outdoor temperature Tout.

[0123] For example, during cooling operation when the indoor temperature Tin is lower than the outdoor temperature Tout, if the outdoor temperature Tout drops and the temperature difference Td between the indoor temperature Tin and the outdoor temperature Tout decreases, it can be estimated that the indoor air A4 is moving from the indoor Rin to the outdoor Rout through the ventilation duct 52. In this case, it can be estimated that the indoor pressure Pin is positive relative to the outdoor pressure Pout, and the pressure difference Pd between the indoor Rin and the outdoor Rout is decreasing.

[0124] Furthermore, during cooling operation when the indoor temperature Tin is lower than the outdoor temperature Tout, if the indoor temperature Tin rises and the temperature difference Td between the indoor temperature Tin and the outdoor temperature Tout decreases, it can be estimated that the outdoor air A3 is moving from the outdoor Rout to the indoor Rin through the ventilation duct 52. In this case, it can be estimated that the indoor pressure Pin is negative relative to the outdoor pressure Pout, and the pressure difference Pd between the indoor Rin and the outdoor Rout is decreasing.

[0125] In this way, the pressure difference Pd between the indoor temperature Rin and the outdoor temperature Rout can be estimated based on the temperature difference Td between the indoor temperature Tin and the outdoor temperature Tout.

[0126] In the third embodiment, the control device 60 causes the ventilation device 50 to perform supply ventilation or exhaust ventilation based on a change in the indoor temperature Tin or a change in the outdoor temperature Tout. The control device 60 adjusts the ventilation capacity of the ventilation device 50 using the temperature difference Td between the indoor temperature Tin and the outdoor temperature Tout, which is caused by the pressure difference Pd between the indoor temperature Rin and the outdoor temperature Rout, as information related to the pressure of the indoor temperature Rin.

[0127] As shown in Fig. 17, the air conditioner 10B is equipped with a first temperature sensor 74 and a second temperature sensor 76. The first temperature sensor 74 detects the indoor temperature Tin of the indoor room Rin. The second temperature sensor 76 detects the outdoor temperature Tout of the outdoor room Rout.

[0128] The first temperature sensor 74 is disposed in the indoor unit 20. For example, the first temperature sensor 74 is disposed near one end of the ventilation duct 52 disposed on the room Rin side. The first temperature sensor 74 may also be disposed at one end of the ventilation duct 53. Alternatively, the first temperature sensor 74 may be disposed at a position within the indoor unit 20 through which the outdoor air A3 discharged from one end of the ventilation duct 53 flows.

[0129] The second temperature sensor 76 is disposed in the ventilation device 50. For example, the second temperature sensor 76 is disposed near the other end of the ventilation duct 52 disposed on the outdoor Rout side. The second temperature sensor 76 may also be disposed at the other end of the ventilation duct 53. Alternatively, the second temperature sensor 76 may be disposed in a position within the ventilation device 50 through which the room air A4 discharged from the other end of the ventilation duct 53 flows.

[0130] The indoor temperature Tin detected by the first temperature sensor 74 and the outdoor temperature Tout detected by the second temperature sensor 76 are sent to the control device 60.

[0131] In step S10 of the third embodiment, the control device 60 acquires the temperature difference Td between the room temperature Tin detected by the first temperature sensor 74 and the outdoor temperature Tout detected by the second temperature sensor 76 as information related to the pressure of the room Rin.

[0132] As shown in FIG. 18, step S10 includes steps S11B to S13B.

[0133] In step S11B, the first temperature sensor 74 detects the room temperature Tin of the room Rin. The room temperature Tin detected by the first temperature sensor 74 is sent to the control device 60.

[0134] In step S12B, the second temperature sensor 76 detects the outdoor temperature Tout of the outdoor Rout. The outdoor temperature Tout detected by the second temperature sensor 76 is transmitted to the control device 60.

[0135] In step S13B, the control device 60 calculates the temperature difference Td between the room temperature Rin and the room temperature Rout. For example, the control device 60 calculates the temperature difference Td by subtracting the outdoor temperature Tout from the room temperature Tin.

[0136] In step S20 of the third embodiment, the control device 60 adjusts the ventilation capacity of the ventilation device 50 based on the change in the indoor temperature Tin, the change in the outdoor temperature Tout, and the temperature difference Td.

[0137] As shown in FIG. 19, step S20 includes steps S21C to S25C.

[0138] In step S21C, the control device 60 determines whether the room temperature Tin is changing. For example, the control device 60 determines that the room temperature Tin is changing when the rate of change of the room temperature Tin exceeds a predetermined threshold. For example, step S21C may be performed with the ventilation operation of the ventilation device 50 stopped.

[0139] When the room temperature Tin is changing, it can be estimated that the room temperature Rin is at a negative pressure relative to the outdoor temperature Rout because the outdoor air A3 is moving to the room temperature Rin through the ventilation duct 52.

[0140] If the room temperature Tin has changed, the process proceeds to step S24C. If the room temperature Tin has not changed, the process proceeds to step S22C.

[0141] In step S22C, the control device 60 determines whether the outdoor temperature Tout is changing. For example, the control device 60 determines that the outdoor temperature Tout is changing when the rate of change of the outdoor temperature Tout exceeds a predetermined threshold. For example, step S22C may be performed with the ventilation operation of the ventilation device 50 stopped.

[0142] When the outdoor temperature Tout is changing, it can be estimated that the indoor air A4 is moving to the outdoor air Rout through the ventilation duct 52, and therefore the indoor air Rin is at a positive pressure relative to the outdoor air Rout.

[0143] If the outdoor temperature Tout has changed, the process proceeds to step S23C. If the outdoor temperature Tout has not changed, the process returns to step S21C.

[0144] In step S23C, the control device 60 controls the ventilation device 50 to perform exhaust ventilation.

[0145] In step S24C, the control device 60 controls the ventilation device 50 to perform supply ventilation.

[0146] In step S25C, the control device 60 adjusts the ventilation capacity of the ventilation device 50 based on the temperature difference Td. For example, the control device 60 reduces the ventilation volume as the temperature difference Td decreases.

[0147] FIG. 20 shows an example of control during cooling operation.

[0148] As shown in Fig. 20, the indoor temperature Tin rises from a state in which it is lower than the outdoor temperature Tout. In this case, it can be estimated that the outdoor air A3 moves from the outdoor air Rout to the indoor air Rin through the ventilation duct 52, warming the indoor air A3 and causing the indoor temperature Tin to rise. For this reason, it can be estimated that the indoor air Rin is at a negative pressure relative to the outdoor air Rout.

[0149] When the control device 60 determines that the indoor temperature Tin is changing relative to the outdoor temperature Tout, it controls the ventilation device 50 to perform supply air ventilation. The control device 60 also adjusts the ventilation volume of the supply air ventilation in accordance with changes in the temperature difference Td. In the example shown in Figure 20, as the temperature difference Td decreases, the control device 60 decreases the ventilation volume of the supply air ventilation.

[0150] FIG. 21 shows another example of control during cooling operation.

[0151] As shown in Fig. 21, the outdoor temperature Tout drops from a state in which the indoor temperature Tin is lower than the outdoor temperature Tout. In this case, it can be estimated that the outdoor temperature Tout drops because the indoor air A4 moves from the indoor temperature Rin to the outdoor temperature Rout through the ventilation duct 52, cooling the outdoor temperature Rout with the indoor air A4. Therefore, it can be estimated that the indoor temperature Rin is at a positive pressure relative to the outdoor temperature Rout.

[0152] When the control device 60 determines that the outdoor temperature Tout is changing relative to the indoor temperature Tin, it controls the ventilation device 50 to perform exhaust ventilation. The control device 60 also adjusts the ventilation volume of the exhaust ventilation in accordance with changes in the temperature difference Td. In the example shown in Fig. 21, as the temperature difference Td decreases, the control device 60 decreases the ventilation volume of the exhaust ventilation.

[0153] As described above, in the air conditioner 10B of this embodiment, the information related to the pressure of the indoor temperature Rin includes the temperature difference Td between the indoor temperature Tin and the outdoor temperature Tout, which is caused by the pressure difference Pd between the indoor temperature Rin and the outdoor temperature Rout. The control device 60 adjusts the ventilation capacity based on the temperature difference Td.

[0154] With this configuration, the ventilation capacity can be efficiently adjusted based on the temperature difference Td between the indoor temperature Tin and the outdoor temperature Tout.

[0155] The air conditioner 10B is equipped with a first temperature sensor 74 that is arranged near one end of the ventilation duct 52 located on the indoor Rin side and detects the indoor temperature Tin, and a second temperature sensor 76 that is arranged near the other end of the ventilation duct 52 located on the outdoor Rout side and detects the outdoor temperature Tout. The control device 60 calculates the temperature difference Td based on the indoor temperature Tin detected by the first temperature sensor 74 and the outdoor temperature Tout detected by the second temperature sensor 76.

[0156] With this configuration, the correlation between the temperature difference Td and the pressure difference Pd is improved, and the ventilation capacity can be adjusted more efficiently based on the temperature difference Td.

[0157] In this embodiment, an example has been described in which the control device 60 performs supply ventilation or exhaust ventilation based on a change in the indoor temperature Tin or a change in the outdoor temperature Tout, but the present invention is not limited to this. For example, the control device 60 does not have to perform supply ventilation or exhaust ventilation based on a change in the indoor temperature Tin or a change in the outdoor temperature Tout. For example, the control device 60 may adjust the ventilation volume based on the temperature difference Td while maintaining the ventilation mode selected by the user.

[0158] (Fourth embodiment) An air conditioner according to a fourth embodiment of the present disclosure will be described.

[0159] In the fourth embodiment, differences from the first embodiment will be mainly described. In the fourth embodiment, the same or equivalent configurations as those in the first embodiment will be denoted by the same reference numerals. Also, in the fourth embodiment, descriptions that overlap with those in the first embodiment will be omitted.

[0160] Fig. 22 is a schematic block diagram showing the main configuration of an air conditioner according to embodiment 4 of the present disclosure. Fig. 23 is a flowchart of control of an air conditioner according to embodiment 4 of the present disclosure. Fig. 24 is a flowchart of control of an air conditioner according to embodiment 4 of the present disclosure. Fig. 25 is a timing chart of control of an air conditioner according to embodiment 4 of the present disclosure. Fig. 26 is another timing chart of control of an air conditioner according to embodiment 4 of the present disclosure.

[0161] Embodiment 4 differs from Embodiment 1 in that the air conditioner 10C is equipped with a first humidity sensor 78 that detects the indoor humidity Hin of the indoor room Rin, and a second humidity sensor 80 that detects the outdoor humidity Hout of the outdoor room Rout. Embodiment 4 also differs from Embodiment 1 in that the information related to the pressure of the indoor room Rin is the humidity difference Hd between the indoor room Rin and the outdoor room Rout caused by the pressure difference between the indoor room Rin and the outdoor room Rout, and the control device 60 adjusts the ventilation capacity of the ventilation device 50 based on the humidity difference Hd.

[0162] The ventilation duct 52 spatially connects the indoor Rin and the outdoor Rout. Therefore, the outdoor air A3 moves from the outdoor Rout to the indoor Rin through the ventilation duct 52, and the indoor air A4 moves from the indoor Rin to the outdoor Rout through the ventilation duct 52. For example, when a pressure difference Pd occurs between the indoor Rin and the outdoor Rout, the pressure difference Pd causes the outdoor air A3 or the indoor air A4 to move through the ventilation duct 52.

[0163] For example, when the indoor pressure Pin is positive relative to the outdoor pressure Pout, the indoor air A4 moves from the indoor Rin to the outdoor Rout through the ventilation duct 52. When the indoor pressure Pin is negative relative to the outdoor pressure Pout, the outdoor air A3 moves from the outdoor Rout to the indoor Rin through the ventilation duct 52. As the outdoor air A3 or the indoor air A4 moves through the ventilation duct 52 due to the pressure difference Pd, the indoor humidity Hin or the outdoor humidity Hout fluctuates. Therefore, the pressure difference Pd can be estimated based on the humidity difference Hd between the indoor humidity Hin and the outdoor humidity Hout.

[0164] For example, when the indoor humidity Hin is lower than the outdoor humidity Hout, if the outdoor humidity Hout decreases and the humidity difference Hd between the indoor humidity Hin and the outdoor humidity Hout decreases, it can be estimated that the indoor air A4 is moving from the indoor humidity Rin to the outdoor humidity Rout through the ventilation duct 52. In this case, it can be estimated that the indoor pressure Pin is a positive pressure relative to the outdoor pressure Pout, and the pressure difference Pd between the indoor humidity Rin and the outdoor humidity Rout is decreasing.

[0165] Furthermore, when the indoor humidity Hin is lower than the outdoor humidity Hout, if the indoor humidity Hin rises and the humidity difference Hd between the indoor humidity Hin and the outdoor humidity Hout decreases, it can be estimated that the outdoor air A3 is moving from the outdoor Rout to the indoor Rin through the ventilation duct 52. In this case, it can be estimated that the indoor pressure Pin is negative relative to the outdoor pressure Pout, and the pressure difference Pd between the indoor Rin and the outdoor Rout is decreasing.

[0166] In this way, the pressure difference Pd between the indoor humidity Rin and the outdoor humidity Rout can be estimated based on the humidity difference Hd between the indoor humidity Hin and the outdoor humidity Hout.

[0167] In the fourth embodiment, the control device 60 causes the ventilation device 50 to perform supply ventilation or exhaust ventilation based on a change in the indoor humidity Hin or a change in the outdoor humidity Hout. The control device 60 adjusts the ventilation capacity of the ventilation device 50 using the humidity difference Hd between the indoor humidity Hin and the outdoor humidity Hout, which is generated by the pressure difference Pd between the indoor humidity Rin and the outdoor humidity Rout, as information related to the pressure of the indoor humidity Rin.

[0168] As shown in Fig. 22, the air conditioner 10C is equipped with a first humidity sensor 78 and a second humidity sensor 80. The first humidity sensor 78 detects the indoor humidity Hin of the room Rin. The second humidity sensor 80 detects the outdoor humidity Hout of the outdoor Rout.

[0169] The first humidity sensor 78 is disposed in the indoor unit 20. For example, the first humidity sensor 78 is disposed near one end of the ventilation duct 52 disposed on the room Rin side. The first humidity sensor 78 may also be disposed at one end of the ventilation duct 53. Alternatively, the first humidity sensor 78 may be disposed at a position within the indoor unit 20 through which the outdoor air A3 discharged from one end of the ventilation duct 53 flows.

[0170] The second humidity sensor 80 is disposed in the ventilation device 50. For example, the second humidity sensor 80 is disposed near the other end of the ventilation duct 52 disposed on the outdoor Rout side. The second humidity sensor 80 may be disposed at the other end of the ventilation duct 53. Alternatively, the second humidity sensor 80 may be disposed in a position within the ventilation device 50 where the room air A4 discharged from the other end of the ventilation duct 53 flows.

[0171] The indoor humidity Hin detected by the first humidity sensor 78 and the outdoor humidity Hout detected by the second humidity sensor 80 are sent to the control device 60.

[0172] In step S10 of the fourth embodiment, the control device 60 acquires the humidity difference Hd between the indoor humidity Hin detected by the first humidity sensor 78 and the outdoor humidity Hout detected by the second humidity sensor 80 as information regarding the pressure of the room Rin.

[0173] As shown in FIG. 23, step S10 includes steps S11C to S13C.

[0174] In step S11C, the first humidity sensor 78 detects the indoor humidity Hin of the room Rin. The indoor humidity Hin detected by the first humidity sensor 78 is transmitted to the control device 60.

[0175] In step S12C, the second humidity sensor 80 detects the outdoor humidity Hout of the outdoor area Rout. The outdoor humidity Hout detected by the second humidity sensor 80 is transmitted to the control device 60.

[0176] In step S13C, the control device 60 calculates the humidity difference Hd between the indoor humidity Rin and the outdoor humidity Rout. For example, the control device 60 calculates the humidity difference Hd by subtracting the outdoor humidity Hout from the indoor humidity Hin.

[0177] In step S20 of the fourth embodiment, the control device 60 adjusts the ventilation capacity of the ventilation device 50 based on the change in the indoor humidity Hin, the change in the outdoor humidity Hout, and the humidity difference Hd.

[0178] As shown in FIG. 24, step S20 includes steps S21D to S25D.

[0179] In step S21D, the control device 60 determines whether the indoor humidity Hin has changed. For example, the control device 60 determines that the indoor humidity Hin has changed when the rate of change of the indoor humidity Hin exceeds a predetermined threshold. For example, step S21D may be performed with the ventilation operation of the ventilation device 50 stopped.

[0180] When the indoor humidity Hin is changing, it can be estimated that the outdoor air A3 is moving to the indoor Rin through the ventilation duct 52, and therefore the indoor Rin is at a negative pressure relative to the outdoor Rout.

[0181] If the indoor humidity Hin has changed, proceed to step S24D. If the indoor humidity Hin has not changed, proceed to step S22D.

[0182] In step S22D, the control device 60 determines whether the outdoor humidity Hout is changing. For example, the control device 60 determines that the outdoor humidity Hout is changing when the rate of change of the outdoor humidity Hout exceeds a predetermined threshold. For example, step S22D may be performed with the ventilation operation of the ventilation device 50 stopped.

[0183] When the outdoor humidity Hout is changing, it can be estimated that the indoor air A4 is moving to the outdoor air Rout through the ventilation duct 52, and therefore the indoor air Rin is at a positive pressure relative to the outdoor air Rout.

[0184] If the outdoor humidity Hout has changed, the process proceeds to step S23D. If the outdoor humidity Hout has not changed, the process returns to step S21D.

[0185] In step S23D, the control device 60 controls the ventilation device 50 to perform exhaust ventilation.

[0186] In step S24D, the control device 60 controls the ventilation device 50 to perform supply ventilation.

[0187] In step S25D, the control device 60 adjusts the ventilation capacity of the ventilation device 50 based on the humidity difference Hd. For example, the control device 60 reduces the ventilation volume as the humidity difference Hd decreases.

[0188] FIG. 25 shows an example of control of an air conditioner in the fourth embodiment.

[0189] 25, the indoor humidity Hin is rising from a state in which it is lower than the outdoor humidity Hout. In this case, it can be estimated that the outdoor air A3 moves from the outdoor air Rout to the indoor air Rin through the ventilation duct 52, causing the indoor humidity Hin to be humidified by the outdoor air A3, resulting in an increase in the indoor humidity Hin. For this reason, it can be estimated that the indoor humidity Rin is at a negative pressure relative to the outdoor air Rout.

[0190] When the control device 60 determines that the indoor humidity Hin is changing relative to the outdoor humidity Hout, it controls the ventilation device 50 to perform supply air ventilation. The control device 60 also adjusts the ventilation volume of the supply air ventilation in accordance with changes in the humidity difference Hd. In the example shown in Figure 25, as the humidity difference Hd decreases, the control device 60 decreases the ventilation volume of the supply air ventilation.

[0191] FIG. 26 shows another example of control of the air conditioner in the fourth embodiment.

[0192] As shown in Figure 26, the outdoor humidity Hout decreases from a state in which the indoor humidity Hin is smaller than the outdoor humidity Hout. In this case, it can be estimated that the outdoor humidity Hout decreases because the indoor air A4 moves from the indoor humidity Rin to the outdoor humidity Rout through the ventilation duct 52, and the outdoor humidity Rout is humidified by the indoor air A4. Therefore, it can be estimated that the indoor humidity Rin is at a positive pressure relative to the outdoor humidity Rout.

[0193] When the control device 60 determines that the outdoor humidity Hout is changing relative to the indoor humidity Hin, it controls the ventilation device 50 to perform exhaust ventilation. The control device 60 also adjusts the ventilation volume of the exhaust ventilation in accordance with changes in the humidity difference Hd. In the example shown in Fig. 26, as the humidity difference Hd decreases, the control device 60 decreases the ventilation volume of the exhaust ventilation.

[0194] As described above, in the air conditioner 10C of this embodiment, the information related to the pressure of the indoor temperature Rin includes the humidity difference Hd between the indoor humidity Hin and the outdoor humidity Hout, which is caused by the pressure difference Pd between the indoor temperature Rin and the outdoor temperature Rout. The control device 60 adjusts the ventilation capacity based on the humidity difference Hd.

[0195] With this configuration, the ventilation capacity can be efficiently adjusted based on the humidity difference Hd between the indoor humidity Hin and the outdoor humidity Hout.

[0196] The ventilation device 50 includes a first humidity sensor 78 that is arranged near one end of the ventilation duct 52 located on the indoor Rin side and detects the indoor humidity Hin, and a second humidity sensor 80 that is arranged near the other end of the ventilation duct 52 located on the outdoor Rout side and detects the outdoor humidity Hout. The control device 60 calculates the humidity difference Hd based on the indoor humidity Hin detected by the first humidity sensor 78 and the outdoor humidity Hout detected by the second humidity sensor 80.

[0197] With this configuration, the correlation between the humidity difference Hd and the pressure difference Pd is improved, and the ventilation capacity can be adjusted more efficiently based on the humidity difference Hd.

[0198] In the present embodiment, an example has been described in which the control device 60 performs supply ventilation or exhaust ventilation based on a change in the indoor humidity Hin or a change in the outdoor humidity Hout, but the present invention is not limited to this. For example, the control device 60 does not have to perform supply ventilation or exhaust ventilation based on a change in the indoor humidity Hin or a change in the outdoor humidity Hout. For example, the control device 60 may adjust the ventilation volume based on the humidity difference Hd while maintaining the ventilation mode selected by the user.

[0199] (Embodiment 5) An air conditioner according to a fifth embodiment of the present disclosure will be described.

[0200] In the fifth embodiment, differences from the first embodiment will be mainly described. In the fifth embodiment, the same or equivalent configurations as those in the first embodiment will be denoted by the same reference numerals. Also, in the fifth embodiment, descriptions that overlap with those in the first embodiment will be omitted.

[0201] Fig. 27 is a schematic block diagram showing the main configuration of an air conditioner according to embodiment 5 of the present disclosure. Fig. 28 is a flowchart of control of an air conditioner according to embodiment 5 of the present disclosure. Fig. 29 is a flowchart of control of an air conditioner according to embodiment 5 of the present disclosure. Fig. 30 is a timing chart of control of an air conditioner according to embodiment 5 of the present disclosure.

[0202] The fifth embodiment differs from the first embodiment in that the information regarding the pressure of the indoor air Rin is the voltage value of the motor 56, which varies depending on the pressure difference Pd between the indoor air Rin and the outdoor air Rout, and the control device 60 adjusts the ventilation capacity of the ventilation device 50 based on the voltage value of the motor 56.

[0203] For example, when exhaust ventilation is performed, the volume of room air A4 blown from the room Rin to the room Rout is controlled by the voltage value of the motor 56 that drives the ventilation fan 54. For example, if the motor 56 is a DC motor, the rotation speed of the DC motor decreases as the load torque increases. For this reason, the voltage value is increased as the load torque increases, and the voltage value is decreased as the load torque decreases, thereby controlling the rotation speed of the motor 56 to maintain a target value.

[0204] When exhaust ventilation is being performed, if the indoor Rin is at a positive pressure relative to the outdoor Rout and the pressure difference Pd is relatively high ("high positive pressure"), indoor air A4 moves easily from the indoor Rin to the outdoor Rout through the ventilation conduit 52. That is, under "high positive pressure," the load torque of the motor 56 is small. Therefore, control is performed to reduce the voltage value in order to maintain the rotation speed of the motor 56 at a target value. On the other hand, under "low positive pressure," the pressure difference Pd is relatively low, compared to "high positive pressure," indoor air A4 moves less easily from the indoor Rin to the outdoor Rout through the ventilation conduit 52. That is, under "low positive pressure," the load torque of the motor 56 is greater than under "high positive pressure." Therefore, control is performed to increase the voltage value in order to maintain the rotation speed of the motor 56 at a target value.

[0205] In this way, in terms of adjusting the air volume of the indoor air A4 blown from the indoor Rin to the outdoor Rout to a target value when exhaust ventilation is being performed, at "high positive pressure," the indoor air A4 moves relatively easily from the indoor Rin to the outdoor Rout, so the voltage value of the motor 56 becomes relatively small. On the other hand, at "low positive pressure," the indoor air A4 moves relatively difficultly from the indoor Rin to the outdoor Rout, so the voltage value of the motor 56 becomes relatively large.

[0206] Therefore, when the pressure difference Pd between the indoor Rin and outdoor Rout fluctuates, the voltage value of the motor 56 that drives the ventilation fan 54 fluctuates.

[0207] In the fifth embodiment, the control device 60 adjusts the ventilation capacity of the ventilation device 50 based on the voltage value of the motor 56, which varies depending on the pressure difference Pd between the room Rin and the outdoor Rout, as information about the pressure of the room Rin.

[0208] As shown in FIG. 27, the ventilation device 50 includes a ventilation fan 54 and a motor 56 .

[0209] The ventilation fan 54 is a fan for blowing air. In supply ventilation, the ventilation fan 54 blows outdoor air A3 from the outdoor Rout to the indoor Rin through the ventilation duct 52. In exhaust ventilation, the ventilation fan 54 blows indoor air A4 from the indoor Rin to the outdoor Rout through the ventilation duct 52.

[0210] The motor 56 is a motor that drives the ventilation fan 54. The motor 56 is controlled by a control device 60.

[0211] The control device 60 controls the rotation speed of the ventilation fan 54 by controlling the voltage value of the motor 56. In this way, the amount of air blown by the ventilation fan 54, that is, the ventilation amount, is controlled.

[0212] As shown in FIG. 28, step S10 of the fifth embodiment includes step S11D.

[0213] In step S11D, the control device 60 acquires the voltage value of the motor 56. Note that step S11D may be performed, for example, with the ventilation operation of the ventilation device 50 stopped.

[0214] As shown in FIG. 29, step S20 in the fifth embodiment includes step S21E.

[0215] In step S21E, the control device 60 adjusts the ventilation capacity based on the voltage value of the motor 56. The control device 60 adjusts the ventilation volume of the ventilator 50 based on the voltage value of the motor 56, which varies depending on the pressure difference Pd.

[0216] For example, the control device 60 adjusts the ventilation volume based on the voltage value of the motor 56 and a fifth threshold value T5. For example, when exhaust ventilation is being performed, if the voltage value of the motor 56 is lower than the fifth threshold value T5, the control device 60 reduces the ventilation volume of the ventilation device 50. If the voltage value of the motor 56 is equal to or higher than the fifth threshold value T5, the control device 60 increases the ventilation volume of the ventilation device 50.

[0217] The fifth threshold T5 is a reference value for adjusting the ventilation volume. For example, the fifth threshold T5 may be the voltage value of the motor 56 when the pressure difference Pd between the indoor air Rin and the outdoor air Rout is 0. The fifth threshold T5 may be a predetermined value or a value set by the user.

[0218] FIG. 30 shows an example of control of ventilation volume when exhaust ventilation is being performed.

[0219] As shown in Figure 30, the control device 60 adjusts the ventilation volume of the exhaust ventilation in accordance with fluctuations in the voltage value of the motor 56. Specifically, when the voltage value of the motor 56 is lower than a fifth threshold T5, the control device 60 determines that the indoor Rin relative to the outdoor Rout is a "high positive pressure" and adjusts the ventilation volume of the exhaust ventilation so that the ventilation volume becomes relatively small. When the voltage value of the motor 56 is equal to or higher than the fifth threshold T5, the control device 60 determines that the indoor Rin relative to the outdoor Rout is a "low positive pressure" and adjusts the ventilation volume of the exhaust ventilation so that the ventilation volume becomes relatively large.

[0220] As described above, in the air conditioner 10D of the present embodiment, the information related to the pressure of the indoor air Rin includes the voltage value of the motor 56, which varies depending on the pressure difference Pd between the indoor air Rin and the outdoor air Rout. The control device 60 adjusts the ventilation capacity based on the voltage value of the motor 56.

[0221] With this configuration, the ventilation capacity of the ventilation device 50 can be efficiently adjusted based on the voltage value of the motor 56.

[0222] In this embodiment, the control in exhaust ventilation has been described, but the present invention is not limited to this and can also be applied to, for example, supply ventilation.

[0223] When supply ventilation is performed, when the indoor Rin is at negative pressure relative to the outdoor Rout and the pressure difference Pd is relatively high ("high negative pressure"), outdoor air A3 moves easily from the outdoor Rout to the indoor Rin through the ventilation duct 52. On the other hand, when the pressure difference Pd is relatively low ("low negative pressure"), outdoor air A3 moves less easily from the outdoor Rout to the indoor Rin through the ventilation duct 52 compared to "high negative pressure." Therefore, at "high negative pressure," outdoor air A3 moves relatively easily from the outdoor Rout to the indoor Rin, and the voltage value of motor 56 becomes relatively small. On the other hand, at "low negative pressure," outdoor air A3 moves relatively less easily from the outdoor Rout to the indoor Rin, and the voltage value of motor 56 becomes relatively large.

[0224] For this reason, when the voltage value of motor 56 is smaller than a predetermined threshold, control device 60 may determine that indoor Rin relative to outdoor Rout is "high negative pressure" and adjust the ventilation volume of supply air ventilation so that the ventilation volume becomes relatively small. Alternatively, when the voltage value of motor 56 is equal to or greater than a predetermined threshold, control device 60 may determine that indoor Rin relative to outdoor Rout is "low negative pressure" and adjust the ventilation volume of supply air ventilation so that the ventilation volume becomes relatively large.

[0225] In the present embodiment, an example has been described in which the control device 60 adjusts the ventilation capacity based on the voltage value of the motor 56. However, the present invention is not limited to this. For example, the control device 60 may adjust the ventilation capacity based on the current value of the motor 56.

[0226] <Variation 3> In the third modification, the control by the control device 60 to adjust the ventilation capacity based on the current value of the motor 56 that varies depending on the pressure difference Pd will be described with reference to FIG.

[0227] Fig. 31 is a timing chart of control of an air conditioner according to Modification 3. In Fig. 31, the current value of the motor 56, which varies depending on the pressure difference Pd, is used as an example of information relating to the pressure of the room Rin.

[0228] As shown in Figure 31, the control device 60 adjusts the ventilation volume of the exhaust ventilation in accordance with fluctuations in the current value of the motor 56. Specifically, when the current value of the motor 56 is smaller than a sixth threshold T6, the control device 60 determines that the indoor Rin relative to the outdoor Rout is a "high positive pressure" and adjusts the ventilation volume of the exhaust ventilation so that the ventilation volume becomes relatively small. When the current value of the motor 56 is equal to or greater than the sixth threshold T6, the control device 60 determines that the indoor Rin relative to the outdoor Rout is a "low positive pressure" and adjusts the ventilation volume of the exhaust ventilation so that the ventilation volume becomes relatively large.

[0229] With this configuration, the ventilation capacity of the ventilation device 50 can be efficiently adjusted based on the current value of the motor 56.

[0230] Although the present invention has been described above using the above-mentioned embodiments, the present disclosure is not limited to the above-mentioned embodiments, and the technology in the present disclosure is also applicable to embodiments in which modifications, substitutions, additions, omissions, etc. are made as appropriate.

[0231] Although the present disclosure has been fully described in connection with the preferred embodiments with reference to the accompanying drawings, various changes and modifications will be apparent to those skilled in the art, and such changes and modifications are to be understood as being included within the scope of the present disclosure as defined by the appended claims unless they depart therefrom.

[0232] Furthermore, the general and specific aspects of the present disclosure may be realized by a system, a method, a computer program, a computer-readable storage medium, and combinations thereof.

[0233] (Other embodiments) For example, in the above-described embodiment, the air conditioners 10 to 10D have been described as separate-type air conditioners in which the indoor unit 20 and the outdoor unit 30 are separate. However, the air conditioners 10 to 10D may also be integrated-type air conditioners in which the indoor unit 20 and the outdoor unit 30 are integrated. Alternatively, the air conditioners 10 to 10D may be central air conditioning systems that include a heat source unit and multiple fan coil units and control the air conditioning of multiple rooms.

[0234] (Addendum) The above description of the embodiments discloses the following techniques.

[0235] (Technology 1) An air conditioner comprising a ventilation device that ventilates a room and a control device that controls the ventilation device, wherein the control device acquires information about the pressure in the room and adjusts the ventilation capacity of the ventilation device based on the information about the pressure in the room.

[0236] With this configuration, the ventilation capacity of the ventilation device can be adjusted efficiently.

[0237] (Technology 2) The air conditioner according to Technology 1, wherein the information relating to the indoor pressure includes an indoor pressure in the room, and the control device adjusts the ventilation capacity based on the indoor pressure.

[0238] With this configuration, the ventilation capacity of the ventilation device can be efficiently adjusted based on the indoor pressure.

[0239] (Technology 3) The air conditioner according to Technology 2, further comprising a first pressure sensor that detects the indoor pressure, and the control device adjusts the ventilation capacity based on the indoor pressure detected by the first pressure sensor.

[0240] With this configuration, the indoor pressure can be easily obtained and the ventilation capacity of the ventilation device can be efficiently adjusted based on the indoor pressure.

[0241] (Technology 4) The air conditioner according to Technology 1, wherein the information about the indoor pressure includes a pressure difference between the indoor and outdoor pressures, and the control device adjusts the ventilation capacity based on the pressure difference.

[0242] With this configuration, the ventilation capacity of the ventilation device can be efficiently adjusted based on the pressure difference between the inside and outside of the room.

[0243] (Technology 5) An air conditioner according to Technology 4, further comprising a first pressure sensor that detects an indoor pressure inside the room and a second pressure sensor that detects an outdoor pressure outside the room, wherein the control device calculates a pressure difference between the indoor and outdoor spaces from the indoor pressure detected by the first pressure sensor and the outdoor pressure detected by the second pressure sensor.

[0244] With this configuration, the pressure difference between the inside and outside of the room can be easily obtained, and the ventilation capacity of the ventilation device can be efficiently adjusted based on the pressure difference.

[0245] (Technology 6) The ventilation device includes a ventilation fan that blows air and a motor that drives the ventilation fan, and the information about the pressure inside the room includes a voltage value or a current value of the motor that varies depending on the pressure difference between the inside and outside of the room, and the control device adjusts the ventilation capacity based on the voltage value or the current value of the motor. This is an air conditioner described in Technology 1.

[0246] With this configuration, the ventilation capacity of the ventilation device can be efficiently adjusted based on the voltage value or current value of the motor.

[0247] (Technology 7) The information regarding the pressure inside the room includes a temperature difference between the indoor temperature and the outdoor temperature caused by the pressure difference between the indoor and outdoor areas, and the control device adjusts the ventilation capacity based on the temperature difference.

[0248] With this configuration, the ventilation capacity of the ventilation device can be efficiently adjusted based on the temperature difference between the indoor temperature and the outdoor temperature.

[0249] (Technology 8) The ventilation device includes a ventilation duct connecting the indoors and the outdoors, a first temperature sensor located near one end of the ventilation duct located on the indoor side and detecting the indoor temperature, and a second temperature sensor located near the other end of the ventilation duct located on the outdoor side and detecting the outdoor temperature, and the control device calculates the temperature difference based on the indoor temperature detected by the first temperature sensor and the outdoor temperature detected by the second temperature sensor.

[0250] With this configuration, the temperature difference between the indoor temperature and the outdoor temperature can be easily obtained, and the ventilation capacity of the ventilation device can be efficiently adjusted based on the temperature difference.

[0251] (Technology 9) The information regarding the indoor pressure includes a humidity difference between the indoor humidity and the outdoor humidity caused by the pressure difference between the indoor and outdoor areas, and the control device adjusts the ventilation capacity based on the humidity difference.

[0252] With this configuration, the ventilation capacity of the ventilation device can be efficiently adjusted based on the humidity difference between the indoor humidity and the outdoor humidity.

[0253] (Technology 10) The ventilation device includes a ventilation duct connecting the indoors and the outdoors, a first humidity sensor located near one end of the ventilation duct located on the indoor side and detecting the indoor humidity, and a second humidity sensor located near the other end of the ventilation duct located on the outdoor side and detecting the outdoor humidity, and the control device calculates the humidity difference based on the indoor humidity detected by the first humidity sensor and the outdoor humidity detected by the second humidity sensor.

[0254] With this configuration, the humidity difference between the indoor humidity and the outdoor humidity can be easily obtained, and the ventilation capacity of the ventilation device can be efficiently adjusted based on the humidity difference.

[0255] (Technology 11) The ventilation device is capable of supplying air from the outside of the room to the inside of the room, and exhausting air from the inside of the room to the outside of the room, 11. The air conditioner according to any one of techniques 1 to 10, wherein the control device is capable of switching between the supply ventilation and the exhaust ventilation based on information about the pressure in the room.

[0256] This configuration allows switching between supply ventilation and exhaust ventilation.

[0257] (Technology 12) An air conditioner as described in Technology 11, wherein the information regarding the indoor pressure includes the indoor pressure in the room, and the control device obtains a first threshold value indicating the pressure at which to switch between the supply ventilation and the exhaust ventilation, and reduces the ventilation capacity when the indoor pressure approaches the first threshold value.

[0258] This configuration reduces the number of times that ventilation switches between supply ventilation and exhaust ventilation.

[0259] (Technology 13) An air conditioner described in Technology 11 or 12, wherein the information regarding the indoor pressure includes the indoor pressure in the room, and the control device obtains a first threshold value indicating the pressure at which to switch between the supply ventilation and the exhaust ventilation, and increases the ventilation capacity when the indoor pressure moves away from the first threshold value.

[0260] This configuration reduces the number of times that ventilation switches between supply ventilation and exhaust ventilation.

[0261] (Technology 14) The air conditioner according to any one of Technologies 1 to 13, wherein the ventilation capacity is a ventilation volume or a blowing air pressure of the ventilation device.

[0262] With this configuration, the ventilation capacity of the ventilation device can be adjusted efficiently.

[0263] (Technology 15) An air conditioner according to any one of technologies 1 to 14, wherein the ventilation device includes a ventilation fan that blows air, and the control device adjusts the ventilation capacity by controlling the rotation speed of the ventilation fan.

[0264] With this configuration, the ventilation capacity of the ventilation device can be adjusted efficiently.

[0265] (Technology 16) A control method for an air conditioner equipped with a ventilation device that ventilates a room, the control method for an air conditioner including the steps of acquiring information about the pressure in the room, and adjusting the ventilation capacity of the ventilation device based on the information about the pressure in the room.

[0266] With this configuration, the ventilation capacity of the ventilation device can be adjusted efficiently.

[0267] (Technology 17) A program that causes an air conditioner to execute the control method described in Technology 16.

[0268] With this configuration, the ventilation capacity of the ventilation device can be adjusted efficiently.

[0269] (Technology 18) A non-transitory computer-readable storage medium on which a computer program is stored, wherein when the computer program is executed by a processor, the control method described in Technology 16 is realized. A non-transitory computer-readable storage medium.

[0270] With this configuration, the ventilation capacity of the ventilation device can be adjusted efficiently. [Industrial Applicability]

[0271] The present disclosure is applicable to any air conditioner equipped with a ventilation device. [Explanation of symbols]

[0272] 10 Air conditioner 20 Indoor unit 22 Indoor heat exchanger 24 Fans 30 Outdoor unit 32 Outdoor heat exchanger 34 Fans 36 Compressor 38 Expansion valve 40 Four-way valve 50 Ventilation Equipment 52 Ventilation duct 54 Ventilation fan 56 Motor 60 Control device 70 First pressure sensor 72 Second pressure sensor 74 First temperature sensor 76 Second temperature sensor 78 First humidity sensor 80 Second humidity sensor

Claims

1. A ventilation system for ventilating the room; A control device that controls the ventilation device; Equipped with The control device obtaining information about the pressure in the chamber; adjusting the ventilation capacity of the ventilation device based on information about the pressure in the room; Air conditioner.

2. the information about the pressure in the chamber includes an internal pressure in the chamber; The control device adjusts the ventilation capacity based on the indoor pressure. The air conditioner according to claim 1.

3. a first pressure sensor for detecting the pressure inside the chamber; The control device adjusts the ventilation capacity based on the indoor pressure detected by the first pressure sensor. The air conditioner according to claim 2.

4. The information about the pressure inside the room includes a pressure difference between the inside and outside of the room, The control device adjusts the ventilation capacity based on the pressure difference. The air conditioner according to claim 1.

5. a first pressure sensor for detecting a pressure in the chamber; a second pressure sensor for detecting the outdoor pressure outside the room; Furthermore, the control device calculates a pressure difference between the indoor pressure and the outdoor pressure based on the indoor pressure detected by the first pressure sensor and the outdoor pressure detected by the second pressure sensor. The air conditioner according to claim 4.

6. The ventilation device includes: A ventilation fan for blowing air, a motor that drives the ventilation fan; Equipped with the information about the pressure inside the room includes a voltage value or a current value of the motor that varies depending on a pressure difference between the inside and outside of the room; The control device adjusts the ventilation capacity based on the voltage value or the current value of the motor. The air conditioner according to claim 1.

7. The information about the indoor pressure includes a temperature difference between the indoor temperature and the outdoor temperature caused by the pressure difference between the indoor and outdoor temperatures, The control device adjusts the ventilation capacity based on the temperature difference. The air conditioner according to claim 1.

8. The ventilation device includes: a ventilation duct connecting the indoor space and the outdoor space; a first temperature sensor disposed near one end of the ventilation duct disposed on the indoor side and detecting the indoor temperature; a second temperature sensor disposed near the other end of the ventilation duct disposed on the outdoor side and configured to detect the outdoor temperature; Equipped with the control device calculates the temperature difference based on the indoor temperature detected by the first temperature sensor and the outdoor temperature detected by the second temperature sensor. The air conditioner according to claim 7.

9. The information about the indoor pressure includes a humidity difference between the indoor humidity and the outdoor humidity caused by a pressure difference between the indoor and outdoor pressures, The control device adjusts the ventilation capacity based on the humidity difference. The air conditioner according to claim 1.

10. The ventilation device includes: a ventilation duct connecting the indoor space and the outdoor space; a first humidity sensor disposed near one end of the ventilation duct disposed on the indoor side and detecting the indoor humidity; a second humidity sensor disposed near the other end of the ventilation duct disposed on the outdoor side and detecting the outdoor humidity; Equipped with The control device calculating the humidity difference based on the indoor humidity detected by the first humidity sensor and the outdoor humidity detected by the second humidity sensor; The air conditioner according to claim 9.

11. The ventilation device is capable of supplying air ventilation by blowing air from the outside into the room and exhausting air by blowing air from the room to the outside, The control device The supply ventilation and the exhaust ventilation can be switched based on information about the pressure in the room. The air conditioner according to claim 1.

12. the information about the pressure in the chamber includes an internal pressure in the chamber; The control device obtaining a first threshold value indicating a pressure at which the supply ventilation and the exhaust ventilation are switched; When the indoor pressure approaches the first threshold, the ventilation capacity is reduced. The air conditioner according to claim 11.

13. the information about the pressure in the chamber includes an internal pressure in the chamber; The control device obtaining a first threshold value indicating a pressure at which the supply ventilation and the exhaust ventilation are switched; When the indoor pressure is away from the first threshold, the ventilation capacity is increased. The air conditioner according to claim 11.

14. The ventilation capacity is the ventilation volume or blowing pressure of the ventilation device. The air conditioner according to claim 1.

15. The ventilation device includes a ventilation fan that blows air, The control device adjusts the ventilation capacity by controlling the rotation speed of the ventilation fan. The air conditioner according to claim 1.

16. A control method for an air conditioner equipped with a ventilation device that ventilates a room, obtaining information about the pressure in the chamber; adjusting the ventilation capacity of the ventilation device based on information about the pressure in the room; Including, A method for controlling an air conditioner.

17. A program that causes an air conditioner to execute the control method according to claim 16.

18. A non-transitory computer-readable storage medium on which a computer program is stored, When the computer program is executed by a processor, the control method according to claim 16 is realized. A non-transitory computer-readable storage medium.

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