JP7638846B2 - Air conditioning equipment - Google Patents

Description

This disclosure relates to air conditioning devices.

For example, Patent Document 1 describes an air conditioner that grasps the operating status of multiple compressors and controls the on/off and operating capacity of each compressor accordingly.

JP 2012-145275 A

The purpose of this application is to disclose an example of an air conditioner that can suppress fluctuations in indoor temperature while extending as long as possible the operating time until thermo-off, i.e., when the supply of cold or hot heat to the room is stopped.

It is desirable for the air conditioner to have at least one of the following components, for example. That is, the first requirement is that the air conditioner has a plurality of heat exchangers (15) for cooling or heating the air to be supplied to the room, a plurality of blowers (15A) for blowing the air cooled or heated by each of the plurality of heat exchangers (15) into the room, a plurality of temperature sensors (17A, 17B) for detecting the temperature of the air before being cooled or heated by each of the plurality of heat exchangers (15) or the temperature of the air after being cooled or heated by the heat exchanger (15), and at least one control unit (10, 16) for controlling the cold or hot heat generated by each of the plurality of heat exchangers (15) and the plurality of blowers (15A).

The second requirement is that when a stop condition is met in any of the multiple air conditioners (11) and the predicted power consumption during increased air volume (Pw2) is less than the predicted power consumption during thermo-off (Pw1), the control unit (10, 16) executes increased air volume control without executing thermo-off control for the air conditioner (11) for which the stop condition is met.

The air conditioner (11) refers to a combination of a heat exchanger (15), a temperature sensor (17A, 17B) corresponding to the heat exchanger (15), and a blower (15A) corresponding to the heat exchanger (15).

The control unit (10, 16) controls the cold or hot heat generated by the heat exchanger (15) using the temperature detected by the temperature sensor (17A, 17B) corresponding to the heat exchanger (15), and can also perform thermo-off control, air volume increase control, and power consumption prediction functions.

Thermo-off control is executed at least when the detected temperature meets a predetermined temperature condition, and is a control that stops the generation of cold or hot heat, while the airflow increase control is a control that increases the airflow volume compared to before the airflow increase control was executed, regardless of the detected temperature.

The power consumption prediction function is executed when the necessary conditions for executing thermo-off control (hereinafter referred to as the stop conditions) are met, and is a function that predicts the total power consumption when thermo-off control is executed without increasing airflow control (hereinafter referred to as predicted power consumption when thermo-off (Pw1)), and the total power consumption when increasing airflow control is executed without executing thermo-off control (hereinafter referred to as predicted power consumption when increasing airflow (Pw2)).

This makes it possible for the air conditioner to suppress fluctuations in indoor temperature while extending as long as possible the operating time until the thermostat is turned off, i.e., the supply of cold or hot heat to the room is stopped.

Incidentally, the symbols in parentheses above are examples showing the corresponding relationship with the specific configurations etc. described in the embodiments described below, and the present disclosure is not limited to the specific configurations etc. shown by the symbols in parentheses above.

1 is a diagram showing an air conditioning device according to a first embodiment; 3 is a flowchart showing the operation of the air conditioner according to the first embodiment.

The following "embodiment of the invention" shows an example of an embodiment that falls within the technical scope of this disclosure. In other words, the invention-specific matters described in the claims are not limited to the specific configurations and structures shown in the embodiment below.

At least one of each of the components or parts described with a reference number is provided, unless otherwise specified by "one". In other words, unless otherwise specified by "one", two or more of the components may be provided. The air conditioner shown in this disclosure includes at least the components described with a reference number, as well as the structural elements shown in the drawings.

First Embodiment
1. Overview of air conditioning equipment
In this embodiment, an example of an air conditioning device according to the present disclosure is applied to an air conditioning device that provides air conditioning in a server room such as a data center or a communication equipment room, etc. As shown in FIG.

Each air conditioner 11 is a so-called "package air conditioner" that is configured with a vapor compression refrigeration unit. Note that each of the multiple air conditioners 11 according to this embodiment is a vapor compression refrigeration unit with the same configuration and specifications.

Each air conditioner 11 generates cold or hot heat (cold in this embodiment) to condition the server room. The air conditioner 11 includes a compressor 12, a condenser 13, an expansion valve 14, an evaporator 15, a control unit 16, a first temperature sensor 17A to a fourth temperature sensor 17D, a first pressure sensor 17E, etc.

The compressor 12 compresses low-pressure gas-phase refrigerant and supplies it to the condenser 13. The compressor 12 is driven by an electric motor (not shown). The electric motor is driven by an inverter-type drive circuit (not shown). The operation of the drive circuit is controlled by the control unit 16.

That is, the drive circuit supplies a drive current to the electric motor and can change the frequency of the drive current (hereinafter referred to as the drive frequency). The drive circuit supplies the electric motor with a drive current having a drive frequency according to a command frequency from the control unit 16. In other words, the operation of the compressor 12 is controlled by the control unit 16 via the drive circuit.

The condenser 13 is a high-pressure side heat exchanger that cools the high-pressure refrigerant compressed by the compressor 12. In the condenser 13, the gas phase refrigerant is cooled and liquefied (condensed). The expansion valve 14 reduces the pressure and expands the high-pressure refrigerant flowing out from the condenser 13, and supplies it to the evaporator 15.

The evaporator 15 evaporates the low-pressure liquid refrigerant to generate cold heat. The first fan 3A blows cooling air to the condenser 13. The second fan 5A generates an airflow that passes through the evaporator 15 and is supplied to the server room.

The control unit 16 controls at least the opening degree of the compressor 12, the second blower 5A, and the expansion valve 14. That is, the control unit 16 constitutes a capacity control unit that controls the rotation speed of the compressor 2, and a fan control unit that controls the air volume of the second blower 5A.

The control unit 16 is configured with a microcomputer having a CPU, ROM, RAM, etc. The capacity control unit and fan control unit are realized by the CPU executing software stored in a non-volatile storage unit such as the ROM.

The control unit 16 receives detection signals from the first temperature sensor 17A to the fourth temperature sensor 17D and the first pressure sensor 17E. The first temperature sensor 17A detects the temperature of the air before it is cooled by the evaporator 15.

The second temperature sensor 17B detects the temperature of the air after it has been cooled by the evaporator 15. The third temperature sensor 17C detects the refrigerant temperature at the refrigerant outlet of the evaporator 15. The fourth temperature sensor 17D detects the refrigerant temperature at the refrigerant inlet of the evaporator 15. The first pressure sensor 17E detects the refrigerant pressure inside the evaporator 15.

2. Control of Air Conditioner Operation
<2.1 Control operation of each air conditioner>
<Expansion valve control>
Each control unit 16 controls the opening degree of the expansion valve 14 so that the degree of superheat of the refrigerant at the refrigerant outlet of the evaporator 15 becomes a predetermined degree of superheat. Each control unit 16 grasps the temperature difference between the temperature detected by the third temperature sensor 17C and the evaporation temperature calculated from the pressure detected by the first pressure sensor 17E as the degree of superheat.

<Compressor control>
Each capacity control section, i.e., each control section 16, can control the compressor 12 by suction priority control or refrigeration off control. In the suction priority control, the refrigeration capacity generated in the evaporator 15 is controlled. In the refrigeration off control, the compressor 12 is stopped.

<Suction priority control>
In suction priority control, the control unit 16 controls the rotation speed of the compressor 12 so that the temperature detected by the first temperature sensor 17A (hereinafter, in this embodiment, referred to as the suction temperature) becomes a predetermined temperature (hereinafter, referred to as the suction set temperature).

Specifically, when the suction temperature is higher than the suction set temperature, the control unit 16 increases the rotation speed of the compressor 12. When the suction temperature is lower than the suction set temperature, the control unit 16 decreases the rotation speed of the compressor 12.

<Thermo-off control>
In the thermo-off control, the control unit 16 stops the compressor 12 when a state in which a predetermined condition (hereinafter, referred to as a stop condition) is satisfied exceeds a predetermined time. In other words, the stop condition is a necessary condition for executing the thermo-off control.

The stop condition in this embodiment refers to a state in which the temperature condition is met in which the suction temperature is equal to or lower than a predetermined temperature (hereinafter referred to as the thermo-off threshold) and the rotation speed of the compressor 12 is equal to or lower than a predetermined rotation speed (hereinafter referred to as the lower limit rotation speed).

The control unit 16 according to this embodiment grasps the "rotation speed of the compressor 12" from the drive frequency. Therefore, the control unit 16 stops the compressor 12 when the suction temperature drops below the thermo-off threshold and the drive frequency remains below the frequency corresponding to the above rotation speed (hereinafter referred to as the minimum frequency) for a predetermined period of time.

<Control of the second fan>
The fan control unit, i.e., the control unit 16, can control the second blower 5A in normal control or air volume increase control. The normal control is executed at least when the suction priority control is executed. The capacity control unit and the fan control unit operate independently and in parallel with each other.

<Normal control>
The control unit 16 controls the air volume of the second blower 5A so that the temperature detected by the second temperature sensor 17B (hereinafter referred to as the blowing temperature) becomes a preset temperature (hereinafter referred to as the blowing/suction setting temperature).

Specifically, when the blowing temperature is higher than the blowing/suction set temperature, the control unit 16 decreases the command speed to the second blower 5A, and when the blowing temperature is lower than the blowing/suction set temperature, the control unit 16 increases the command speed. The blowing/suction set temperature is a temperature obtained by adding a predetermined value to the suction set temperature.

<Air volume increase control>
The airflow increase control according to this embodiment is a control for increasing the airflow rate compared to before the airflow increase control is executed, regardless of the blowing temperature. In this embodiment, when the airflow increase control is executed, the blowing/suction set temperature is changed to a lower temperature (hereinafter referred to as the increased set temperature) compared to before the airflow increase control is executed only during the airflow increase control.

For this reason, if the amount of heat generated in the server room (hereinafter referred to as the thermal load) fluctuates from the time the airflow increase control is started, the control unit 16 may set the airflow to a smaller volume than the airflow immediately before the airflow increase control was started in order to maintain the blowing temperature at the increased setting temperature.

In other words, the air volume increase control has a first air volume increase control period during which the air volume is greater than the air volume immediately before the air volume increase control is started, and a second air volume increase control period following the first air volume increase control period, that is, a period during which the air volume changes so that the blowing temperature becomes the increased setting temperature.

<2.2 Timing of Execution of Air Volume Increase Control>
When each control unit 16 receives an execution permission signal, it executes the airflow increase control without executing the thermo-off control. When each control unit 16 does not receive an execution permission signal, it executes the normal control and the thermo-off control without executing the airflow increase control.

That is, when a stop condition is satisfied, each control unit 16 transmits a signal to that effect (hereinafter, referred to as a stop condition satisfaction signal) to the power consumption prediction unit 10A of the integrated control unit 10. When the power consumption prediction unit 10A receives the stop condition satisfaction signal, it executes the power consumption prediction function.

The integrated control unit 10 is configured as a microcomputer having a CPU, ROM, RAM, etc., and is capable of communicating with each control unit 16. The power consumption prediction unit 10A, etc. are realized by the CPU executing software stored in a non-volatile storage unit such as a ROM.

The power consumption prediction unit 10A, i.e., the integrated control unit 10, calculates and predicts the predicted power consumption when the thermo is off Pw1 and the predicted power consumption when the air volume is increased Pw2.

The predicted power consumption when thermo is off Pw1 refers to the total power consumption when thermo is off control is executed without increasing airflow control. The predicted power consumption when airflow is increased Pw2 refers to the total power consumption when airflow is increased control is executed without thermo is off control.

Then, when the predicted power consumption when the air volume is increased Pw2 is smaller than the predicted power consumption when the thermostat is off Pw1, the integrated control unit 10 sends an execution permission signal to the control unit 16 that sent the stop condition establishment signal.

In addition, when the predicted power consumption when the air volume is increased Pw2 is not smaller than the predicted power consumption when the thermostat is off Pw1, the integrated control unit 10 sends an execution prohibition signal to the control unit 16 that sent the stop condition establishment signal without sending an execution permission signal.

In other words, if the integrated control unit 10 predicts that the execution of air volume increase control will result in a reduction in power consumption (hereinafter referred to as an energy saving effect), it allows the execution of air volume increase control, and if it predicts that no energy saving effect will occur, it does not allow the execution of air volume increase control.

Then, when the total power consumption after a predetermined time has elapsed since the start of the air volume increase control is equal to or greater than the power consumption before the air volume increase Pw3, the integrated control unit 10 sends a signal to the control unit 16 that sent the execution prohibition signal to stop the air volume increase control and execute the thermo-off control.

Note that the power consumption before air volume increase Pw3 refers to the total power consumption before air volume increase control is executed. The total power consumption refers to the power consumption of each air conditioner 11 (particularly the compressor 12).

In other words, after the integrated control unit 10 assumes that an energy saving effect will occur and issues a command to execute air volume increase control, it verifies whether or not the energy saving effect has actually occurred, and if the energy saving effect has not actually occurred, it stops the air volume increase control and executes thermo-off control.

<Details of energy saving effect forecast>
When a stop condition is met in any of the multiple air conditioners 11 and a pre-stop compressor is present among one or more non-target compressors 12, the integrated control unit 10 determines that an energy saving effect will be achieved for the target air conditioner and permits the execution of air volume increase control.

In other words, when one or more non-target compressors 12 include a compressor that has not yet been stopped, the integrated control unit 10 determines that the predicted power consumption during increased airflow Pw2 is less than the predicted power consumption during thermo-off Pw1, and sends an execution permission signal.

The target air conditioner refers to an air conditioner among the multiple air conditioners 11 for which the stop condition is met. The non-target compressor refers to a compressor corresponding to an air conditioner among the multiple air conditioners 11 for which the stop condition is not met. The pre-stop compressor refers to a compressor that is operating at or above a predetermined rotation speed that is higher than the lower limit rotation speed.

<See example of air conditioner operation (Figure 2)>
Fig. 2 is a flowchart showing an example of the operation of the air conditioner 1. The control shown in Fig. 2 is started simultaneously with the start of the compressor 12, and is stopped simultaneously with the stop of the compressor 12. Hereinafter, each control unit 16 and the integrated control unit 10 will be collectively referred to as the "control unit".

When this control is activated, the control unit controls the second blower 5A with normal control and the compressor 12 with suction priority control (S1). Hereinafter, these controls are simply referred to as "normal control." Next, the control unit determines whether the stop condition is met (S2).

If the stop condition is not met (S2: NO), the control unit continues normal control (S1). If the stop condition is met (S1: YES), the control unit calculates and predicts whether or not there is an energy saving effect (S3).

If it is determined that there is an energy saving effect (S3: YES), the control unit executes the air volume increase control (S4). If it is determined that there is no energy saving effect (S3: NO), the control unit executes the thermo-off control.

Then, after the air volume increase control is executed, the control unit determines whether the compressor speed (capacity) of the air conditioners other than the air conditioner for which the air volume increase control is executed has decreased, i.e., whether an energy saving effect has actually occurred (S5).

If the energy saving effect is actually occurring (S5: YES), the control unit executes S3 again. If the energy saving effect is not actually occurring (S5: NO), the control unit executes the thermo-off control.

3. Features of the Air Conditioner According to the Present Embodiment (See FIG. 3)
When the predicted power consumption Pw2 during increased air volume is smaller than the predicted power consumption Pw1 during thermo-off, the integrated control unit 10 instructs the control unit 16, which sent the stop condition establishment signal, to execute increased air volume control without executing thermo-off control.

This makes it possible for the air conditioner 1 to suppress fluctuations in indoor temperature while extending as long as possible the operating time until the thermostat is turned off, i.e., the supply of cold or hot heat to the room is stopped.

When the integrated control unit 10 determines that an energy saving effect is occurring and issues a command to execute air volume increase control, and then determines that an energy saving effect is not actually occurring, it stops the air volume increase control and executes thermo-off control. This can prevent an increase in total power consumption.

Other Embodiments
In the above embodiment, the description focuses on the cooling operation. However, the present disclosure is not limited to this. That is, the present disclosure is also applicable to the heating operation. In this case, the target heat exchanger is the condenser 3, and the target blower is the first blower 3A.

The air conditioner according to the above embodiment is a so-called "package air conditioner" configured with a vapor compression refrigeration machine. However, the present disclosure is not limited to this. In other words, the present disclosure is also applicable to air conditioners that perform cooling or heating by circulating cold water or hot water through a heat exchanger, for example.

The capacity control unit of the air conditioner controls the amount of cold or hot heat generated in the heat exchanger by controlling the flow rate of cold or hot water circulated through the heat exchanger. Specifically, the capacity control unit controls the amount of cold or hot heat generated by controlling the opening of the flow control valve.

In the air conditioner 1 according to the embodiment described above, the compressor 12 is controlled so that the suction temperature becomes the suction set temperature, and the second blower 15A is controlled so that the blowing temperature becomes the blowing set temperature.

However, the present disclosure is not limited to this. That is, the present disclosure may be configured, for example, to control the compressor 12 so that the blowing temperature becomes the blowing set temperature, and to control the air volume of the second blower 15A in conjunction with the drive frequency of the compressor 12.

Specifically, the second blower 15A in this configuration is controlled so that when the rotation speed of the compressor 12 increases, the air volume increases accordingly, and when the rotation speed of the compressor 2 decreases, the air volume decreases accordingly.

In the air conditioner 1 according to the embodiment described above, the outlet/intake set temperature is changed to the increased set temperature only during air volume increase control. However, the present disclosure is not limited to this. In other words, the disclosure may be, for example, that the air volume is the air volume immediately before the start of the air volume increase control plus a predetermined amount until a predetermined time has elapsed from the start of the air volume increase control.

In the air conditioner 1 according to the embodiment described above, the control unit 16 and the integrated control unit 10 communicate with each other and cooperate to execute the above control. However, the present disclosure is not limited to this. That is, the disclosure may be, for example, a configuration in which everything is controlled by the integrated control unit 10 alone, or a configuration in which the integrated control unit 10 is eliminated and each control unit 16 also executes the power consumption prediction function.

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

REFERENCE SIGNS LIST 1 air conditioning device 10 integrated control unit 11 air conditioner 12 compressor 13 condenser 14 expansion valve 15 evaporator 16 control unit

Claims (6)

A plurality of heat exchangers for cooling or heating air to be supplied to the room;
A plurality of fans for blowing the air cooled or heated by each of the plurality of heat exchangers into a room;
A plurality of temperature sensors that detect the temperature of air before being cooled or heated by each of the plurality of heat exchangers, or the temperature of air after being cooled or heated by the heat exchangers;
At least one control unit that controls the cold or hot heat generated in each of the plurality of heat exchangers and the plurality of blowers;
The control unit is capable of controlling the cold or hot heat generated in the heat exchanger by utilizing the detected temperature of the temperature sensor corresponding to the heat exchanger, and of executing a thermo-off control, an air volume increase control, and a power consumption prediction function;
The thermo-off control is a control that is executed at least when the detected temperature satisfies a predetermined temperature condition, and is a control that stops the generation of cold or hot heat,
the airflow rate increase control is a control for increasing an airflow rate compared to before the airflow rate increase control is executed, regardless of the detected temperature;
The power consumption prediction function is a function that is executed when a necessary condition for executing the thermo-off control (hereinafter referred to as a stop condition) is satisfied, and is a function that predicts the total power consumption in the case where the thermo-off control is executed without the air volume increase control being executed (hereinafter referred to as a predicted power consumption during thermo-off), and the total power consumption in the case where the air volume increase control is executed without the thermo-off control being executed (hereinafter referred to as a predicted power consumption during air volume increase),
When a combination of the heat exchanger, the temperature sensor corresponding to the heat exchanger, and the blower corresponding to the heat exchanger is an air conditioner,
When the stop condition is met in any one of the plurality of air conditioners and the predicted power consumption during increased air volume is smaller than the predicted power consumption during thermo-off, the control unit executes the increased air volume control for the air conditioner for which the stop condition is met without executing the thermo-off control. The air conditioner according to claim 1, wherein when the stop condition is met and the predicted power consumption during thermo-off is less than the predicted power consumption during air volume increase, the control unit executes the thermo-off control without executing the air volume increase control for the air conditioner for which the stop condition is met. A plurality of heat exchangers that use the cold or hot heat generated by the vapor compression refrigerator to cool or heat air to be supplied to a room;
A plurality of fans for blowing the air cooled or heated by each of the plurality of heat exchangers into a room;
A plurality of temperature sensors that detect the temperature of air before being cooled or heated by each of the plurality of heat exchangers, or the temperature of air after being cooled or heated by the heat exchangers;
At least one control unit that controls the cold or hot heat generated in each of the plurality of heat exchangers and the plurality of blowers;
The control unit is capable of controlling the cold or hot heat generated in the heat exchanger by utilizing the detected temperature of the temperature sensor corresponding to the heat exchanger, and of executing a thermo-off control and an airflow increase control;
The thermo-off control is a control for stopping the compressor when the detected temperature satisfies a predetermined temperature condition, a condition (hereinafter referred to as a stop condition) that the rotation speed of the compressor is equal to or lower than a predetermined rotation speed (hereinafter referred to as a lower limit rotation speed) is satisfied, and the state in which the stop condition is satisfied continues for a predetermined time or more,
the airflow rate increase control is a control for increasing an airflow rate compared to before the airflow rate increase control is executed, regardless of the detected temperature;
When a combination of the heat exchanger, the temperature sensor corresponding to the heat exchanger, and the blower corresponding to the heat exchanger is defined as an air conditioner, an air conditioner among the plurality of air conditioners for which the stop condition is satisfied is defined as a target air conditioner, a compressor corresponding to an air conditioner among the plurality of air conditioners for which the stop condition is not satisfied is defined as a non-target compressor, and a compressor operating at or above a predetermined rotation speed that is higher than the lower limit rotation speed is defined as a pre-stop compressor,
When the stop condition is satisfied in any one of the plurality of air conditioners and a pre-stop compressor is present among one or more of the non-target compressors, the control unit executes the air volume increase control for the target air conditioner without executing the thermo-off control. When the total power consumption before the airflow increase control is executed is the power consumption before the airflow increase control,
4. The air conditioning device according to claim 1, wherein when a total power consumption when a predetermined time has elapsed since the start of the air volume increase control is equal to or greater than the power consumption before the air volume increase control, the control unit is capable of stopping the air volume increase control and executing the thermo-off control. A plurality of heat exchangers for cooling or heating air to be supplied to the room;
A plurality of fans for blowing the air cooled or heated by each of the plurality of heat exchangers into a room;
and a plurality of temperature sensors for detecting the temperature of air before being cooled or heated by each of the plurality of heat exchangers, or the temperature of air after being cooled or heated by the heat exchangers,
a combination of the heat exchanger, the temperature sensor corresponding to the heat exchanger, and the blower corresponding to the heat exchanger is defined as an air conditioner;
An air conditioning control program incorporated in at least one control unit that controls the cold or hot heat generated in each of the plurality of heat exchangers and the plurality of fans,
A function of controlling the cold or hot heat generated in the heat exchanger by utilizing the detected temperature of the temperature sensor corresponding to the heat exchanger;
a thermo-off control function that stops the generation of cold or hot heat, which is a control that is executed at least when the detected temperature satisfies a predetermined temperature condition;
an airflow increase control function for increasing the airflow rate regardless of the detected temperature;
A power consumption prediction function which is executed when a necessary condition for executing the thermo-off control (hereinafter referred to as a stop condition) is met, and which predicts the total power consumption when the thermo-off control is executed without the air volume increase control being executed (hereinafter referred to as a predicted power consumption when thermo-off) and the total power consumption when the air volume increase control is executed without the thermo-off control being executed (hereinafter referred to as a predicted power consumption when air volume is increased); and an air conditioning control program which realizes the function of executing the air volume increase control without executing the thermo-off control for the air conditioners for which the stop condition is met, when the stop condition is met in any of the multiple air conditioners and the predicted power consumption when air volume is increased is smaller than the predicted power consumption when thermo-off. A plurality of heat exchangers that use the cold or hot heat generated by the vapor compression refrigerator to cool or heat air to be supplied to a room;
A plurality of fans for blowing the air cooled or heated by each of the plurality of heat exchangers into a room;
and a plurality of temperature sensors for detecting the temperature of air before being cooled or heated by each of the plurality of heat exchangers, or the temperature of air after being cooled or heated by the heat exchangers,
An air conditioning control program incorporated in at least one control unit that controls the cold or hot heat generated in each of the plurality of heat exchangers and the plurality of fans,
A function of controlling the cold or hot heat generated in the heat exchanger by utilizing the detected temperature of the temperature sensor corresponding to the heat exchanger;
a thermo-off control function for stopping the compressor when the detected temperature satisfies a predetermined temperature condition, and a condition (hereinafter referred to as a stop condition) is met under which the rotation speed of the compressor is equal to or lower than a predetermined rotation speed (hereinafter referred to as a lower limit rotation speed), and the state in which the stop condition is met continues for a predetermined time or longer;
an air volume increase control function for increasing the volume of air sent regardless of the detected temperature, and a combination of the heat exchanger, the temperature sensor corresponding to the heat exchanger, and the blower corresponding to the heat exchanger is defined as an air conditioner, an air conditioner among the plurality of air conditioners for which the stop condition is satisfied is defined as a target air conditioner, a compressor corresponding to an air conditioner among the plurality of air conditioners for which the stop condition is not satisfied is defined as a non-target compressor, and a compressor operating at or above a predetermined rotation speed that is higher than the lower limit rotation speed is defined as a pre-stop compressor,
an air conditioning control program that realizes a function of executing the air volume increase control for the target air conditioner without executing the thermo-off control when the stop condition is satisfied in any of the multiple air conditioners and the pre-stop compressor is present among one or more of the non-target compressors.

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