air conditioning unit

Abstract

This document discloses an example of an air conditioning system that takes into account the fact that exhaust gas recirculation is likely to occur when multiple outdoor units are installed together. [Solution] The control unit 5 is capable of controlling the airflow rate of the fan of outdoor unit D if such a unit exists. Outdoor unit D refers to a second outdoor unit in which the intake air temperature has remained above a threshold temperature for a predetermined period of time. The threshold temperature refers to the temperature obtained by adding a predetermined temperature to the intake air temperature of the first outdoor unit. The first outdoor unit refers to the outdoor unit with the lowest intake air temperature among the multiple outdoor units. The second outdoor unit refers to an outdoor unit other than the first outdoor unit among the multiple outdoor units.

Description

[[Technical Field]]

[0001] The present disclosure relates to an air conditioner including at least a plurality of outdoor units each having a heat exchanger and a blower. [[Background Art]]

[0002] An air conditioner for large buildings such as buildings includes a plurality of outdoor units as disclosed in Patent Document 1 and the like. [[Prior Art Documents]] [[Patent Documents]]

[0003] [[Patent Document 1]] Japanese Unexamined Patent Publication No. 2005-283087 [[Summary of the Invention]] [[Problem to be Solved by the Invention]]

[0004] When a plurality of outdoor units are installed collectively, a short circuit (exhaust gas recirculation) phenomenon of exhaust gas is likely to occur. Occurrence of this phenomenon causes performance degradation and operation shutdown of the air conditioner. The exhaust gas recirculation phenomenon refers to a phenomenon in which exhaust gas discharged from an outdoor unit (air after heat exchange) is sucked into the outdoor unit, making heat exchange with fresh air difficult. The present disclosure discloses an example of an air conditioner made in view of this point. [[Means for Solving the Problem]]

[0005] It is desirable that an air conditioner including a plurality of outdoor units each having a heat exchanger and a blower includes at least one of the following constituent features, for example. That is, the constituent features include: a plurality of temperature sensors (4A to 4C) that detect the temperature of air sucked into each of the plurality of outdoor units; and a control unit (5) capable of controlling the operating state of each of the blowers (1A to 3C), the control unit (5) being capable of executing control using detection temperatures from the plurality of temperature sensors (4A to 4C), and the control unit (5), when there is a D outdoor unit, is capable of executing control to increase the air flow volume of the blower of the D outdoor unit.

[0006] Note that "Outdoor Unit D" refers to the second outdoor unit in which the intake air temperature has remained above the threshold temperature for a predetermined period of time. The threshold temperature is the temperature obtained by adding a predetermined temperature to the intake air temperature of the first outdoor unit. The first outdoor unit refers to the outdoor unit with the lowest intake air temperature among multiple outdoor units. The second outdoor unit refers to the outdoor units other than the first outdoor unit among multiple outdoor units.

[0007] Therefore, the air conditioning system has a function to detect the occurrence of exhaust recirculation, and when the occurrence of exhaust recirculation is detected by this function, the amount of air supplied is increased, thereby promoting the stirring of the outdoor air and suppressing exhaust recirculation.

[0008] The air conditioning system may, for example, have at least one of the following constituent elements: In other words, it is desirable that the system includes multiple temperature sensors (4A to 4C) that detect the temperature of the air drawn into each of the multiple outdoor units, and a control unit (5) that can control the operating state of each of the blowers (1A to 3A), and that, if an outdoor unit D is present, it is possible to perform control to increase the airflow rate of the blower of that outdoor unit D.

[0009] Note that "Outdoor Unit D" refers to the second outdoor unit in which the intake air temperature remains below the threshold temperature for a predetermined period of time. The threshold temperature is the temperature obtained by subtracting a predetermined temperature from the intake air temperature of the first outdoor unit. The first outdoor unit refers to the outdoor unit with the highest intake air temperature among multiple outdoor units. The second outdoor unit refers to the outdoor units other than the first outdoor unit among multiple outdoor units.

[0010] As a result, the air conditioning system also has a function to detect the occurrence of exhaust recirculation, and when the occurrence of exhaust recirculation is detected by this function, the amount of air supplied is increased, thereby promoting the stirring of the outdoor air and suppressing exhaust recirculation.

[0011] The air conditioning system may, for example, have at least one of the following constituent elements: In other words, the system comprises multiple temperature sensors (4A to 4C) for detecting the temperature of the air drawn into each of the multiple outdoor units, and a control unit (5) capable of controlling the operating state of each of the blowers (1A to 3A). The control unit (5) is capable of performing control using the temperatures detected by the multiple temperature sensors (4A to 4C), and the control unit (5) is capable of increasing the airflow rate of all blowers if the temperature difference between the intake air temperature of the first outdoor unit and the intake air temperature of the second outdoor unit exceeds a predetermined temperature difference for a predetermined period of time.

[0012] Note that the first outdoor unit refers to the outdoor unit with the highest intake air temperature among multiple outdoor units. The second outdoor unit refers to the outdoor unit with the lowest intake air temperature among multiple outdoor units. Therefore, the air conditioning system also has a function to detect the occurrence of exhaust recirculation, and when the occurrence of exhaust recirculation is detected by this function, the amount of air supplied is increased, thereby promoting the stirring of the outdoor air and suppressing exhaust recirculation.

[0013] The air conditioning system may, for example, have at least one of the following constituent elements: In other words, the system comprises multiple temperature sensors (4A to 4C) for detecting the temperature of the air drawn into each of the multiple outdoor units, and a control unit (5) capable of controlling the operating state of each of the blowers (1A to 3A). The control unit (5) is capable of performing control using the temperatures detected by the multiple temperature sensors (4A to 4C), and the control unit (5) is capable of increasing the amount of air blown by the blower of the first outdoor unit if the temperature difference between the first intake air temperature and the second intake air temperature remains above a predetermined temperature difference for a predetermined period of time.

[0014] Note that the first outdoor unit refers to any outdoor unit among multiple outdoor units. The second outdoor unit refers to any outdoor unit other than the first outdoor unit among multiple outdoor units. The first intake air temperature refers to the temperature of the air drawn into the first outdoor unit. The second intake air temperature refers to the average value of the temperature of the air drawn into the second outdoor unit.

[0015] That is, this air conditioner also has a function of detecting the occurrence of exhaust recirculation, and increases the air supply volume when the occurrence of exhaust recirculation is detected by this function. Therefore, agitation of outdoor air or the like is promoted, and exhaust recirculation can be suppressed.

[0016] Incidentally, the reference signs in the above parentheses are examples showing the correspondence with specific configurations and the like described in the embodiments described later, and the present disclosure is not limited to the specific configurations and the like indicated by the reference signs in the above parentheses. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] [Figure 1] It is a figure showing the air conditioner according to the first embodiment. [Figure 2] It is a flowchart of a 1st air volume control. [Figure 3] It is a flowchart of a 2nd air volume control. [Figure 4] It is a flowchart of a 3rd air volume control. [Figure 5] It is a flowchart of a 3rd air volume control. DESCRIPTION OF EMBODIMENTS

[0018] The following "embodiments of the invention" show examples of embodiments belonging to the technical scope of the present disclosure. That is, the invention-specifying matters and the like described in the claims are not limited to the specific configurations, structures, and the like shown in the following embodiments.

[0019] (First Embodiment) <1. Overview of Air Conditioner> In the present embodiment, an example of the air conditioner according to the present disclosure is applied to an air conditioner for large buildings such as buildings. As shown in FIG. 1, the air conditioner includes at least a plurality of (three in the present embodiment) outdoor units 1 to 3, temperature sensors 4A to 4C, a control unit 5, and the like.

[0020] Each of the outdoor units 1 to 3 includes at least a heat exchanger (not shown) and blowers 1A to 3A, etc. Each heat exchanger is a device that exchanges heat between a refrigerant (for example, a liquid such as R32 or water) and outdoor air. Each of the blowers 1A to 3A blows outdoor air to the corresponding heat exchanger.

[0021] Note that, when performing indoor cooling (cooling), each of the blowers 1A to 3A dissipates heat to outdoor air by exchanging heat with the outdoor air. When performing indoor heating (heating), each of the blowers 1A to 3A absorbs heat from outdoor air by exchanging heat with the outdoor air.

[0022] Each of the temperature sensors 4A to 4C detects the temperature of air sucked into each of the corresponding outdoor units 1 to 3 (hereinafter referred to as intake air temperature). The control unit 5 controls the operating states of the blowers 1A to 3A. The control unit 5 can execute air volume control using the temperatures detected by the temperature sensors 4A to 4C.

[0023] That is, when a plurality of outdoor units 1 to 3 are installed collectively, exhaust gas discharged from an outdoor unit (air after heat exchange) is sucked into the outdoor unit, which easily causes a phenomenon in which heat exchange with fresh air is hindered (also referred to as exhaust gas recirculation). The above-mentioned air volume control is air volume control for suppressing exhaust gas recirculation.

[0024] <2. Air Volume Control> As air volume control for suppressing exhaust gas recirculation, the control unit 5 according to the present embodiment can execute any one of first air volume control to third air volume control.

[0025] Each air volume control is a control that can execute a function of detecting the occurrence of exhaust gas recirculation (hereinafter referred to as a detection function) and a function of increasing the air volume when the occurrence of exhaust gas recirculation is detected (hereinafter referred to as an air volume increasing function).

[0026] The control unit 5 according to the present embodiment executes each detection function simultaneously in parallel. When the occurrence of exhaust gas recirculation is detected by any one of the detection functions, the control unit 5 executes the air volume increasing control corresponding to the detection function that has detected the exhaust gas recirculation.

[0027] In the following, when identifying one of the multiple outdoor units 1 to 3, outdoor unit 1 will be referred to as Unit 1, outdoor unit 2 as Unit 2, and outdoor unit 3 as Unit 3. Similarly, the blower 1A of Unit 1 will be referred to as Fan 1A, the blower 2A of Unit 2 will be referred to as Fan 2A, and the blower 3A of Unit 3 will be referred to as Fan 3A.

[0028] <2.1 First Airflow Control> <Definition of Terms> Any of the multiple outdoor units 1 to 3 will be designated as the first outdoor unit, and the other outdoor units from those multiple outdoor units 1 to 3 will be designated as the second outdoor units. The intake air temperature of the first outdoor unit will be designated as the first intake air temperature, and the average of the intake air temperatures of the second outdoor unit will be designated as the second intake air temperature.

[0029] Specifically, for example, if the first outdoor unit is Unit 1, the first intake air temperature will be the intake air temperature of Unit 1, and the arithmetic mean of the intake air temperatures of Unit 2 and Unit 3 will be the average intake air temperature of the second outdoor unit.

[0030] Incidentally, if there are two outdoor units, there will be only one second outdoor unit. Therefore, in this case, the intake air temperature of that one second outdoor unit will correspond to the "average intake air temperature of the second outdoor unit."

[0031] <Detection function and airflow increase function> The control unit 5, which performs the first airflow control, determines that exhaust recirculation has occurred if the temperature difference between the first intake air temperature and the second intake air temperature remains above a predetermined temperature difference for a predetermined period of time, and increases the airflow rate from the blower of the first outdoor unit.

[0032] Specifically, as shown in Figure 2, when the air conditioning system is in operation, the control unit 5 measures the intake air temperature of each outdoor unit 1 to 3 until a predetermined time has elapsed (S1). Next, when that time has elapsed, the control unit 5 identifies the first outdoor unit and the second outdoor unit, and determines whether the temperature difference between the first intake air temperature and the second intake air temperature is greater than or equal to a predetermined temperature difference (S2).

[0033] In this embodiment, the control unit 5 identifies the first outdoor unit in the following order: Unit 1 → Unit 2 → Unit 3 → Unit 1 → Unit 2... In other words, in the initial S2, Unit 1 is identified as the first outdoor unit.

[0034] In the second S2, Unit 2-3 is identified as the first outdoor unit. In the third S2, Unit 3-3 is identified as the first outdoor unit. And in the fourth S2, Unit 1-1 is identified as the first outdoor unit.

[0035] If the temperature difference between the first intake air temperature and the second intake air temperature is less than a predetermined temperature difference (S2: NO), the control unit 5 executes S1. If the temperature difference between the first intake air temperature and the second intake air temperature is greater than or equal to a predetermined temperature difference (S2: YES), the control unit 5 determines whether the condition has continued for longer than a predetermined time (S3).

[0036] If it is determined that the temperature difference between the first intake air temperature and the second intake air temperature has remained above a predetermined temperature difference for a period of time exceeding a predetermined time (S3: YES), the current airflow rate of the first outdoor unit is increased by a predetermined amount (S4).

[0037] For example, when Unit 1 is identified as the first outdoor unit, the control unit 5 increases the airflow of the first fan 1A by a predetermined amount, while maintaining the second fan 2A and the third fan 3A at their current state.

[0038] Then, the control unit 5 stops the airflow boost function (S5) and then executes S1 again when the first of the following conditions is met: "when the temperature difference between the first intake air temperature and the second intake air temperature falls below a predetermined temperature difference" or "when a predetermined amount of time has elapsed since the start of the airflow boost function".

[0039] The above explanation regarding the first airflow control is a control that is performed in both cooling and heating operations. In other words, the first airflow control is performed periodically or irregularly while the air conditioning system is in operation.

[0040] <2.2 Second Airflow Control> <Definition of Terms> Of the multiple outdoor units 1 to 3, the outdoor unit with the highest intake air temperature is designated as the first outdoor unit, and the outdoor unit with the lowest intake air temperature is designated as the second outdoor unit.

[0041] <Detection function and airflow increase function> The control unit 5, which performs the second airflow control, determines that exhaust recirculation has occurred if the temperature difference between the intake air temperature of the first outdoor unit and the intake air temperature of the second outdoor unit remains above a predetermined temperature difference for a predetermined period of time, and increases the airflow rate of all blowers.

[0042] Specifically, as shown in Figure 3, when the air conditioning system is in operation, the control unit 5 measures the intake air temperature of each outdoor unit 1 to 3 until a predetermined time has elapsed (S11). Next, the control unit 5 sets the intake air temperature of the first outdoor unit as α and the intake air temperature of the second outdoor unit as β (S12).

[0043] Next, the control unit 5 determines whether the temperature difference between α and β is greater than or equal to a predetermined temperature difference (S13). If the temperature difference between α and β is less than the predetermined temperature difference (S13: NO), the control unit 5 repeats S11.

[0044] If the temperature difference between α and β is greater than or equal to a predetermined temperature difference (S13:YES), it is determined whether the condition has continued beyond a predetermined time (S14). If it is determined that the condition has continued beyond a predetermined time (S14:YES), the control unit 5 increases the airflow rate of the first fan 1A to the third fan 3A by a predetermined amount (S15).

[0045] Then, the control unit 5 stops the airflow boost function (S16) and executes S11 again when the condition is met earlier than the condition that "the temperature difference between α and β falls below a predetermined temperature difference" or "a predetermined time has elapsed since the start of the airflow boost function".

[0046] The above explanation regarding the second airflow control applies to both cooling and heating operations. In other words, the second airflow control is performed periodically or irregularly along with the first airflow control while the air conditioning system is in operation.

[0047] <2.3 Third Airflow Control (During Cooling Operation)> <Definition of Terms> Among the multiple outdoor units 1 to 3, the outdoor unit with the lowest intake air temperature is designated as the first outdoor unit, and the other outdoor units are designated as the second outdoor units. The threshold temperature is the intake air temperature of the first outdoor unit plus a predetermined temperature.

[0048] In this embodiment, for example, if Unit 1 is the first outdoor unit, then Unit 2 and Unit 3 become the second outdoor units. Incidentally, in the case where there are only Unit 1 and Unit 2 outdoor units, for example, if Unit 2 is the first outdoor unit, then Unit 1 becomes the second outdoor unit.

[0049] <Detection function and airflow increase function> If there is an outdoor unit among the second outdoor units in which the intake air temperature has remained above the threshold temperature for a predetermined period of time or longer (hereinafter referred to as a Doubt outdoor unit (hereinafter referred to as a D outdoor unit)), the control unit 5 shall consider that exhaust recirculation has occurred.

[0050] The control unit 5 then increases the airflow rate of the fan on the outdoor unit D. If there are two or more outdoor units D, the control unit 5 increases the airflow rate of any of the outdoor units D (for example, the outdoor unit with the smallest unit number). Hereinafter, the second outdoor unit whose airflow rate has been increased by the airflow rate increase function will be referred to as the Execution outdoor unit (hereinafter referred to as the E outdoor unit).

[0051] Furthermore, in the case where there are two or more second outdoor units, as in this embodiment, if an outdoor unit D is present when a predetermined time has elapsed since the airflow rate of outdoor unit E was increased, the control unit 5 stops increasing the airflow rate of outdoor unit E, and then increases the airflow rate of the fans of the other second outdoor units.

[0052] Specifically, for example, if Unit 1 is the first outdoor unit, Units 2 and 3 are outdoor units D, and Unit 2 is outdoor unit E, and if outdoor unit D is present when a predetermined time has elapsed since the airflow rate of Unit 2 was increased, the control unit 5 will stop increasing the airflow rate of Unit 2 and then increase the airflow rate of the blower of Unit 3.

[0053] Furthermore, for example, if Unit 1 is the first outdoor unit and only Unit 2 is the D outdoor unit, and the D outdoor unit is still present when a predetermined time has elapsed since the airflow rate of Unit 2, which is the D outdoor unit, was increased, the control unit 5 stops increasing the airflow rate of Unit 2, and then increases the airflow rate of the blower of Unit 3, 3.

[0054] In other words, if outdoor unit D is present, control unit 5 increases the airflow rate of one of the fans for a predetermined time, and then determines whether or not outdoor unit D is present. If outdoor unit D is present, control unit 5 increases the airflow rate of the other outdoor units, and then determines again whether or not outdoor unit D is present.

[0055] Then, if outdoor unit D is present, control unit 5 again pre-increases the airflow rate of the other outdoor units. In this way, as long as outdoor unit D is present, control unit 5 sequentially changes which outdoor unit's airflow rate is increased.

[0056] Specifically, as shown in Figure 4, for example, when the air conditioning system is in operation, the control unit 5 measures the intake air temperature of each outdoor unit 1 to 3 until a predetermined time has elapsed (S21). Next, after obtaining the intake air temperature Y of the first outdoor unit (for example, unit 3) (S22), the control unit 5 determines whether or not outdoor unit D is present (S23).

[0057] If it is determined that outdoor unit D exists (S23: YES), the control unit 5 increases the airflow rate of the fan of outdoor unit D (for example, unit 1) for a predetermined period of time (S24). Next, the control unit 5 determines whether or not outdoor unit D exists after a predetermined period of time has elapsed since the airflow rate was increased (S25).

[0058] If it is determined that outdoor unit D exists (S25: YES), the control unit 5 stops increasing the airflow rate of outdoor unit E (in this example, unit 1), and then increases the airflow rate of the blower of the second outdoor unit other than outdoor unit E (for example, unit 2) (S26).

[0059] Then, the control unit 5 determines whether or not outdoor unit D is present after a predetermined time has elapsed since the airflow rate was increased (S27). If it is determined that outdoor unit D is present (S27: YES), the airflow rate of the fan of the outdoor unit other than outdoor unit E (for example, unit 1) is increased (S28).

[0060] Furthermore, if it is determined in S23, S25, or S27 that outdoor unit D does not exist, the control unit 5 will execute S21 again. In other words, if outdoor unit D does not exist, the control unit 5 will not execute the airflow increase function.

[0061] The above-mentioned third airflow control is performed periodically or irregularly along with the first and second airflow control during cooling operation. The third airflow control during heating operation is as follows. The third airflow control during heating operation is also performed periodically or irregularly along with the first and second airflow control.

[0062] <2.4 Third Airflow Control (during heating operation)> <Definition of Terms> Of the multiple outdoor units 1 to 3, the outdoor unit with the highest intake air temperature is designated as the first outdoor unit, and the other outdoor units are designated as the second outdoor units. The threshold temperature is the intake air temperature of the first outdoor unit minus a predetermined temperature.

[0063] <Detection function and airflow increase function> If there is an outdoor unit (D) among the second outdoor units in which the intake air temperature remains below the threshold temperature for a predetermined period of time, that is, an outdoor unit D during heating operation, the control unit 5 will consider that exhaust recirculation has occurred.

[0064] The control unit 5 then increases the airflow rate of the fan on the outdoor unit D. If there are two or more outdoor units D, the control unit 5 selects any of the outdoor units D from among them and increases the airflow rate of that unit as the outdoor unit E.

[0065] Furthermore, in the case where there are two or more second outdoor units, as in this embodiment, if an outdoor unit D is present when a predetermined time has elapsed since the airflow rate of outdoor unit E was increased, the control unit 5 stops increasing the airflow rate of outdoor unit E, and then increases the airflow rate of the fans of the other second outdoor units.

[0066] In other words, if outdoor unit D is present, control unit 5 increases the airflow rate of one of the fans for a predetermined time, and then determines whether or not outdoor unit D is present. If outdoor unit D is present, control unit 5 increases the airflow rate of the other outdoor units, and then determines again whether or not outdoor unit D is present.

[0067] Then, if outdoor unit D is present, control unit 5 again pre-increases the airflow rate of the other outdoor units. In this way, as long as outdoor unit D is present, control unit 5 sequentially changes which outdoor unit's airflow rate is increased.

[0068] Specifically, as shown in Figure 5, for example, when the air conditioning system is in operation, the control unit 5 measures the intake air temperature of each outdoor unit 1 to 3 until a predetermined time has elapsed (S21). Next, after obtaining the intake air temperature Y of the first outdoor unit (for example, unit 3) (S22), the control unit 5 determines whether or not outdoor unit D is present (S23A).

[0069] If it is determined that outdoor unit D exists (S23A: YES), the control unit 5 increases the airflow rate of the fan of the outdoor unit D (for example, unit 1) for a predetermined period of time (S24). Next, the control unit 5 determines whether or not outdoor unit D exists after a predetermined period of time has elapsed since the airflow rate was increased (S25A).

[0070] If it is determined that outdoor unit D exists (S25A: YES), the control unit 5 stops increasing the airflow rate of outdoor unit E (in this example, unit 1), and then increases the airflow rate of the blower of a second outdoor unit other than outdoor unit E (for example, unit 2) (S26).

[0071] Then, the control unit 5 determines whether or not outdoor unit D is present after a predetermined time has elapsed since the airflow rate was increased (S27A). If it is determined that outdoor unit D is present (S27A: YES), the airflow rate of the fan of the outdoor unit other than outdoor unit E (for example, unit 1) is increased (S28).

[0072] Furthermore, if it is determined in S23A, S25A, or S27A that outdoor unit D does not exist, the control unit 5 will execute S21 again. In other words, if outdoor unit D does not exist, the control unit 5 will not execute the airflow increase function.

[0073] <3. Features of the air conditioning system according to this embodiment> The air conditioning system according to this embodiment has a function to detect the occurrence of exhaust gas recirculation, and when the occurrence of exhaust gas recirculation is detected by this detection function, the amount of air supplied is increased. This can promote the stirring of the outdoor air, and thus suppress exhaust gas recirculation.

[0074] (Other embodiments) The control unit 5 according to the above embodiment simultaneously and in parallel executes the detection functions for the first to third airflow control, and when exhaust recirculation is detected by any of the detection functions, it executes an airflow increase control corresponding to the detected detection function. However, the disclosure is not limited thereto.

[0075] In other words, the disclosure may be, for example, a configuration in which only one of the first to third airflow control functions is executed, or a configuration in which any two of the first to third airflow control functions are executed simultaneously in parallel, and when exhaust recirculation is detected by any of the detection functions, an airflow increase control corresponding to the detected detection function is executed.

[0076] Furthermore, this disclosure is not limited to the embodiments described above, but is sufficient to be consistent with the intent of the disclosures described in the embodiments described above. Therefore, it may be a configuration in which at least several of the embodiments described above are combined, or a configuration in which any of the illustrated components or components described with reference numerals in the embodiments described above are omitted. [Explanation of Symbols]

[0077] 1~3…Outdoor unit 1A~3A…Blower 4A~4C... Temperature sensor 5… Control Unit

Claims

1. In an air conditioning system that includes multiple outdoor units, each having a heat exchanger and a blower, Multiple temperature sensors for detecting the temperature of the air drawn into each of the multiple outdoor units, A control unit capable of controlling the operating state of each of the multiple blowers, comprising a control unit capable of performing control using the temperatures detected by the multiple temperature sensors, Among the multiple outdoor units, the outdoor unit with the lowest intake air temperature is designated as the first outdoor unit, and the other outdoor units among the multiple outdoor units are designated as the second outdoor units. When the threshold temperature is defined as the intake air temperature of the first outdoor unit plus a predetermined temperature, and the second outdoor unit in which the intake air temperature remains above the threshold temperature for a predetermined period of time is designated as outdoor unit D, The control unit is an air conditioning system that, if an outdoor unit D is present, can perform control to increase the airflow rate of the fan of the outdoor unit D.

2. When the second outdoor unit whose airflow rate has increased due to the above control is designated as outdoor unit E, The air conditioning system according to claim 1, in the case where there are two or more second outdoor units, and when a predetermined time has elapsed since the airflow rate of outdoor unit E has been increased, outdoor unit D is present, the control unit is capable of stopping the increase in the airflow rate of outdoor unit E and then controlling the airflow rate of the fans of the outdoor units other than outdoor unit E.

3. In an air conditioning system that includes multiple outdoor units, each having a heat exchanger and a blower, Multiple temperature sensors for detecting the temperature of the air drawn into each of the multiple outdoor units, The control unit is capable of controlling the operating state of each of the blowers, and includes a control unit capable of performing control using the temperatures detected by a plurality of temperature sensors. Among the multiple outdoor units, the outdoor unit with the highest intake air temperature is designated as the first outdoor unit, and the other outdoor units among the multiple outdoor units are designated as the second outdoor units. When the threshold temperature is defined as the intake air temperature of the first outdoor unit minus a predetermined temperature, and the second outdoor unit in which the intake air temperature remains below the threshold temperature for a predetermined period of time is designated as outdoor unit D, The control unit is an air conditioning system that, if an outdoor unit D is present, can perform control to increase the airflow rate of the fan of the outdoor unit D.

4. When the second outdoor unit whose airflow rate has increased due to the above control is designated as outdoor unit E, The air conditioning system according to claim 3, in the case where there are two or more second outdoor units, and a predetermined time has elapsed since the airflow rate of outdoor unit E was increased, if outdoor unit D is present, the control unit is capable of stopping the increase in the airflow rate of outdoor unit E and then controlling the airflow rate of the blowers of the second outdoor units other than outdoor unit E.

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