Air conditioner control device, air conditioner control method, and program

An air conditioner control device controls a plurality of air conditioners installed at different positions in a predetermined living room space. A memory unit manages presence and absence data on people who are in a room air-conditioned by each of the air conditioners. Based on the managed presence and absence data, a number-of-people-in-the-room calculation unit calculates, on a per-air-conditioner basis, the number of people who are in the room air-conditioned by each of the air conditioners. A control time determination unit increases or decreases the control time during which an energy saving control of each of the air conditioners is executed, depending on the calculated number of people in the room. A control execution unit repeatedly executes the energy saving control of each of the air conditioners, according to the determined control time.

CROSS REFERENCE TO RELATED APPLICATIONS

This application is a U.S. national stage application of PCT/JP2011/051657 filed on Jan. 27, 2011, and claims priority to, and incorporates by reference, Japanese Patent Application No. 2010-233845 filed on Oct. 18, 2010.

TECHNICAL FIELD

The present invention relates to an air conditioner control device, an air conditioner control method, and a program for performing energy-saving control of a plurality of air conditioners that are located at different positions in an inhabited space in a building or the like.

BACKGROUND ART

In recent years, air conditioner control devices have appeared that execute energy-saving control of an air conditioner by restricting the air conditioning performance of the air conditioner. However, when energy-saving control of an air conditioner is performed without taking into consideration the conditions inside the air-conditioned room or space where the air conditioner is located, there is a possibility that the comfort of the people in the air-conditioned room may be decreased.

Therefore, operation control methods and systems for maintaining the comfort of the people in an air-conditioned room by detecting the temperature difference between the room temperature of the air-conditioned room and the outside temperature, and the positions of the people in the air-conditioned room, and changing the amount of correction for maximum performance for the air-conditioned room (for example, refer to Patent Literature 1).

In this operation control method, the positions of people in an air-conditioned room are found by human body detection sensors that are provided in the indoor device of an air conditioner, and when the air conditioned room becomes stable, the overall heat transfer coefficient of the air-conditioned room (found by dividing the amount of injected heat by the difference between the room temperature and outside temperature) is found, and energy-saving control of the air conditioner is performed according to positions of the people in the room and the overall heat transfer coefficient. As a result, it is possible to execute energy-saving control of the air conditioner without users of the air conditioner feeling uncomfortable even when executing operation that restricts the maximum performance.

Moreover, demand control systems and methods have been disclosed wherein, by performing energy-saving control for a specified time of each of a plurality of air conditioners while at the same time shifting the time period, sudden changes in temperature that cause people in a room to feel uncomfortable are reduced, and a certain amount of comfort is maintained while saving energy (for example, refer to Patent Literature 2).

PRIOR ART LITERATURE

Patent Literature

DISCLOSURE OF THE INVENTION

Problem to be Solved by the Invention

When performing operation control of an air conditioner with the operation control method disclosed in Patent Literature 1, and when occupants of an air-conditioned room are all located in the same direction from a given air conditioner, saving energy by blowing out air in only the same direction is possible. However, in a large inhabited space such as in an office in an office building, when people are located in many directions from a given air conditioner, it becomes difficult to obtain the objective effect of reducing power consumption while trying to maintain the comfort of all of the occupants.

The demand control system in Patent Literature 2 performs control by stopping the air conditioner regardless of the condition of the inhabited space only for a fixed control time while energy-saving control is executed. When performing this kind of stopping control, in an air-conditioned area where there are many people, for example, the temperature rises rapidly while the air conditioner is stopped, and in and air-conditioned area where there are few people, the temperature rise is gradual. Therefore, when the control time is fixed, there is a possibility that differences in comfort will occur according to the number of people in the air-conditioned area.

Taking into consideration the situation described above, the objective of the present invention is to provide an air conditioner control device, an air conditioner control method and a program capable of preventing a drop in comfort due to air conditioning, while at the same time maintaining the effect of reducing the amount of power used by performing energy-saving control.

Means for Solving the Problem

In order to accomplish the objective above, the air conditioner control device of the present invention controls a plurality of air conditioners that are installed at different positions in a specified inhabited space. In this air conditioner control device, a management unit manages information related to people in a space. A number-of-people-in-a-room calculation unit calculates, for each air conditioner, the number of people in a space that is air conditioned by an air conditioner based on the information related to people in the space that is managed by the management unit. A control time determination unit reduces or increases the control time during which energy-saving control of each of the air conditioners is executed per a unit time according to the number people in a space that was calculated by the number-of-people-in-a-room calculation unit. A control execution unit repeatedly executes energy-saving control for each of the air conditioners according to the control time that is reduced or increased by the control time determination unit.

Effects of the Invention

With the present invention, the control time during which energy-saving control is executed for each air conditioner is increased or decreased according to the number of occupants, which become a heat source, in spaces that are air conditioned by a plurality of air conditioners. In doing so, reduced variation in the temperature due to energy-saving control without changing the amount that power consumption has been reduced is possible, regardless of the number of people in an inhabited space. As a result, minimizing a drop in comfort due to air conditioning, while at the same time, maintaining the effect of reduced power consumption by energy-saving control is also possible.

MODE FOR CARRYING OUT THE INVENTION

FIG. 1illustrates the construction of an air conditioning system1of a first embodiment of the present invention. As illustrated inFIG. 1, the air conditioning system1of this embodiment is provided with a plurality of air conditioners (indoor units)2, an electric power measurement device3, a wireless adapter4, remote controllers5, presence/absence sensors6and an air conditioner control device7.

The air conditioners (indoor units)2, the electric power measurement device3, the wireless adapter4and the air conditioner control device7are connected by dedicated communication lines8so as to be able to communicate with each other. Moreover, it is not particularly illustrated inFIG. 1, however, the air conditioner control device7is not only connected to the air conditioners (indoor units)2, but is also connected to heat source units (outdoor units), which have compressors and the like, by way of dedicated communication lines8such that communication is possible.

Furthermore, the remote controllers5are connected to respective air conditioners (indoor units)2such that operation is possible. Moreover, the presence/absence sensors6are connected to the wireless adapter4such that wireless communication is possible and so as to be able to respond with information of whether or not people are nearby, or in other words, information indicating the presence or absence of people in the room.

Each of the plurality of air conditioners (indoor units)2is arranged at a different location inside a specified inhabited space. Each air conditioner (indoor unit)2performs air conditioning of its respective space under the control of the air conditioner control device7such that the temperature of that space approaches the target temperature setting. More specifically, each air conditioner (indoor unit)2receives various instructions from the air conditioner control device7such as a stop instruction, fan instruction, performance limit, temperature setting change instruction and the like that are used for energy-saving control, and performs air conditioning of the corresponding space according to the received instruction. This plurality of air conditioners (indoor units)2will hereafter also be called an air conditioner group10.

The electric power measurement device3is a device for measuring the amount of electric power used by the air conditioning system1or the entire building. The amount of electric power measured by the electric power measurement device3is used for switching the control contents of the air conditioners (indoor units)2.

The wireless adapter4performs data conversion between data having a format that is specified by the communication protocol for data flowing on dedicated communication lines8, and data having a format specified by communication protocol for wireless communication. The air conditioner control device7and the presence/absence sensors6can communicate with each other by way of the wireless adapter4.

The remote controllers5are operation terminals by which a user operates the air conditioners (indoor units)2. By operating the remote controllers5, it is possible to turn ON or turn OFF the corresponding air conditioner (indoor unit)2, as well as change the operating mode between cooling and heating, and change the temperature setting, airflow direction and airflow speed.

The presence/absence sensors6are a way for detecting the presence or absence of people nearby. The presence/absence sensors6, for example, are pressure sensors or the like that are placed on seats inside the inhabited space. When a person in the room sits down on a seat, that presence/absence sensor6detects the presence of that person. When there is a change in the sitting or absence of the person, or when a fixed period of time has passed, the presence/absence sensor6notifies the air conditioner control device7with information related to the presence or absence of the person through the wireless adapter4by wireless communication. The plurality of presence/absence sensors6is hereafter also referred to as a presence/absence sensor group11.

The air conditioner control device7controls and manages the air conditioner group10that includes the plurality of air conditioners (indoor units)2. As illustrated inFIG. 2, the air conditioner control device7is provided with a display20, an input device30, a communication management unit40, a memory unit50and a control unit60.

The display20displays a monitoring screen and operation screen for monitoring the operating state and for operating each of the air conditioners (indoor units)2under the control of the control unit60.

The input device30includes a touch panel, mouse, keyboard or the like. The touch panel is located on the display20. When an administrator or the like operates the touch panel, mouse, keyboard or the like, a signal is outputted to the control unit60according to the contents of that operation (for example, an instruction to switch the monitoring screen, operation of the air conditioner group10, various settings and the like).

The communication management unit40is a communication interface with the dedicated communication lines8. Data is transmitted to and from the air conditioners (indoor units)2by way of the communication management unit40.

The memory unit50stores various data necessary for the control unit60to perform control of the air conditioner group10. The data stored by the memory unit50includes air conditioner data51, energy-saving setting data52, presence/absence data53and measurement device data54.

Air conditioner data51includes connection information71for the connection of each air conditioner (indoor unit)2, and operating state data72of each air conditioner (indoor unit)2.

The connection information71is data necessary for controlling each of the air conditioners (indoor units)2such as the address number, operation group number, model type and the like of each air conditioner (indoor unit)2managed by the air conditioner control device7.

The operating state data72is data that indicates the current operating state of the air conditioners (indoor units)2such as the ON/OFF state of the air conditioners, operating mode such as cooling or heating, the temperature setting, the indoor temperature and the like. The operating state data72is updated when necessary by transmitting data to and receiving data from the air conditioners (indoor units)2.

The area information81is data in which the air conditioners (indoor units)2that are managed by the air conditioner control device7are correlated with a plurality of respective areas that are divided into rooms, departments or the like.

The control level82includes threshold values for switching the control level. When the amount of electric power that is obtained from the electric power measurement device3exceeds a threshold value, the air conditioner control device7switches the control level of the air conditioner (indoor unit)2.

The control time83is data that specifies the execution time for executing energy-saving control of the air conditioners (indoor units)2per a unit time. The control time83can be specified for each area or for each control level82.

The control contents84is data that specifies details of the energy-saving control such as stop control, fan control, performance control and the like. The control contents84can be specified for each area or for each control level82.

The connection information91includes address information of the wireless adapter4and presence/absence sensors6that detect the presence and absence, and various setting data for setting the wireless adapter4and presence/absence sensors6.

The presence/absence status data92is data that indicates the status of people sitting, or the current absence state that is notified from the presence/absence sensor group11. The presence/absence status data92is updated as necessary by exchanging data with the presence/absence sensors6.

The presence/absence correlation data93is data that correlates each of the presence/absence sensors6with a respective air conditioner (indoor unit)2and manages the correlation. The presence/absence sensor6that senses people in a space that is air conditioned by an air conditioner (indoor unit)2is correlated with that air conditioner (indoor unit)2.

The presence/absence status data92and the presence/absence correlation data93can also be said to indicate information related to people in spaces that are air conditioned by the air conditioners (indoor units)2.

The measurement device data54includes connection information101and measurement status data102.

The connection information101includes address information of the electric power measurement device3that measure the amount of electric power, and various setting data for setting the electric power measurement device3.

The measurement status data102includes various measurement data that is obtained from the electric power measurement device3such as the amount of electric power, instantaneous power, voltage, current and the like.

The various data described above that is stored in the memory unit50is written and read as necessary by the control unit60.

The control unit60is provided with a CPU and memory (neither is illustrated in the figure). The function of the control unit60is achieved by the CPU executing a program that is stored in the memory.

The control unit60controls the air conditioner group10that includes the air conditioners (indoor units)2. The control unit60includes a number-of-people-in-a-room calculation unit61, a control time determination unit62, a control execution unit63and management unit64.

The number-of-people-in-a-room calculation unit61calculates for each air conditioner (indoor unit)2the number of presence/absence sensors6that are correlated with the air conditioners (indoor units)2that indicate that a person is present based on presence/absence data53(presence/absence status data92and presence/absence correlation data93) that is stored in the memory unit50. The presence/absence data53is information about the people in spaces that are air conditioned by the air conditioners (indoor units)2. Therefore, the number-of-people-in-a-room calculation unit61can also be said to calculate for each air conditioner (indoor unit)2the number of people in the space air conditioned by the air conditioner (indoor unit)2based on the presence/absence data53.

The control time determination unit62obtains how many people are in spaces air conditioned by the air conditioners (indoor units)2according to the number of people present that was calculated by the number-of-people-in-a-room calculation unit61. Then the control time determination unit62sets the ratio of control time of each air conditioner (indoor unit)2with respect to a unit time, with the control time that is specified by the control time83in the energy-saving setting data52as a reference. The control time determination unit62increases the control time based on this ratio, and sets the control time for which energy-saving control is to be executed for each air conditioner (indoor unit)2.

The control execution unit63repeatedly executes energy-saving control during the control time for each air conditioner (indoor unit)2according to the set control time.

The management unit64manages various data that is stored in the memory unit50by reading or writing the various data above stored in the memory unit50. Particularly, the management unit64also manages the presence/absence status data92and presence/absence correlation data93, and can be said to manage information related to people in spaces that are air conditioned by the air conditioners (indoor units)2.

More specifically, the management unit64collects presence/absence status data92about people detected by the presence/absence sensors6. The management unit64then stores the presence/absence correlation data93in which the air conditioners (indoor units)2and presence/absence sensors6are correlated.

In this case, the number-of-people-in-a-room calculation unit62calculates the number of people in spaces that are air conditioned by the air conditioners (indoor units)2based on the presence/absence status92that is collected by the management unit64and presence/absence correlation data93that is stored by the management unit64.

The control unit60also controls all of the component elements of the air conditioner control device7.

Next, the operation of the air conditioner control device7will be explained.

First, the initial setting process for setting various data in the memory unit50of the air conditioner control device7is explained.

After starting the air conditioning system1, first, the management unit64of the control unit60, according to operation input from the input device30, registers connection information71for the air conditioners (indoor units)2that will be managed, connection information91for the wireless adapter4and presence/absence sensors6, and connection information101for the electric power measurement device3, and other various setting data in the memory unit50(step S1).

Next, the management unit64, through operation input from the input device30, registers the presence/absence sensors6that are located in spaces that are air conditioned by the air conditioners (indoor units)2as presence/absence correlation data93(step S2). The presence/absence correlation data93can also assign a plurality of presence/absence sensors6for an air conditioner (indoor unit)2, or can assign a plurality of air conditioners (indoor units)2for a presence/absence sensor6.

FIG. 5illustrates the relationship between each air conditioner (indoor unit)2and the presence/absence sensors6. InFIG. 5, which air conditioner (indoor unit)2the presence/absence sensors6, which are matched to the seating locations, are assigned to is illustrated using arrows.FIG. 4collects this relationship in the form of a table.

Continuing, the management unit64, through operation input from the input device30, registers areas divided into rooms or department units as area information81(step S3). Each area is set so as to include at least one air conditioner (indoor unit)2. It is also possible for one area to include a plurality of air conditioners (indoor units)2.

FIG. 6schematically illustrates an example of area information81in which a plurality of air conditioners (indoor units)2is correlated with areas. Each area is divided in room units or department units. In the area information81illustrated inFIG. 6, air conditioners01to05are correlated with area01. Air conditioners06to10are correlated with area02. Moreover, air conditioners11to14are correlated with area03. Similar to this, air conditioners are correlated with areas04to09. Furthermore, air conditioners45to50are correlated with area10. In this embodiment, energy-saving control is cyclically executed for each area.

Next, the management unit64is such that through operation input from the input device30, for each control level82, the amount of time that energy-saving control is executed per unit of time (for example 3 minutes of control during 30 minutes) is set as the control time83, and the control contents (stopping control, blower control, performance restrictions, and the like) are set as control contents84(step S4). The control level82is switched according to the amount of electric power obtained from the electric power measurement device3. A user can register threshold values for switching the control level.

By performing the processing above, the initial setting process is complete.

FIG. 7is an example of control when five air conditioners01to05are registered to one area, and the control time83for performing energy-saving control is registered as 6 minutes during a unit time (30 minutes). When the control time is 6 minutes, 3 minutes of energy-saving control is performed two times, and in this example, energy-saving control is performed for air conditioner01during minute 0 to 3, and during minute 15 to 18 for a total of 6 minutes. Energy-saving control is performed for air conditioner02during minute 3 to 6, and during minute 18 to 21 for a total of 6 minutes. Moreover, energy-saving control is performed for air conditioner03during minute 6 to 9, and during minute 21 to 24 for a total of 6 minutes. Energy-saving control is performed for air conditioner04during minute 9 to 12, and during minute 24 to 27 for a total of 6 minutes. Furthermore, energy-saving control is performed for air conditioner05during minute 12 to 15, and during minute 27 to 30 for a total of 6 minutes.

In this embodiment, the air conditioner control device7adjusts the control time for actual energy-saving control of the air conditioners01to05. In other words, for the air conditioners01to05, the actual control time may become shorter or less than 6 minutes depending on the number of people in an area.

Next, the control time calculation process of this embodiment will be explained with reference toFIG. 8.

FIG. 8illustrates a flowchart of the control time calculation process for energy-saving control. This process is executed at the starting time (for example, at 0 minutes or at 30 minutes) for each unit time (for example 30 minutes). By executing this process, the control time for which energy-saving control is executed for each air conditioner (indoor unit)2is calculated based on the presence/absence status data92.

First, the number-of-people-in-a-room calculation unit61calculates how many people are present for each air conditioner (indoor unit)2based on the presence/absence status data92and the presence/absence correlation data93(step S11).

Next, the control time determination unit62uses equation (1) below to calculate the ratio of control time according to the number of people correlated with each air conditioner (indoor unit)2in the same area (step S12).
Ratio of control time=(total number of people inside an area−the number of people)/total of the(total number of people inside an area−the number of people) of air conditioners inside an area  (1)

Next, by calculating the ratio of the total control time of energy-saving control that is executed for the air conditioners (indoor units)2in an area using equation (2) below, it is possible to set the control time for performing energy-saving control (step S13).
Control time=Total control time of energy-saving control of air conditioners in an area×ratio of control time  (2)

Here, an example of calculating the control time for the case in which the respective number of people for the five air conditioners01to05is the number of people as illustrated inFIG. 9.

As illustrated inFIG. 9the number of people associated with air conditioner01is four people, the number of people correlated with air conditioner02is two people, the number of people correlated with air conditioner03is three people, the number of people correlated with air conditioner04is three people, and the number of people correlated with air conditioner05is zero. For this case, there are the total of 12 people in the area, and the sum total of (the total number of the people in the area−(minus) the number of the people) for each of the conditioners in the area is obtained as, (12−4)+(12−2)+(12−3)+(12−3)+(12−0)=48.

Therefore, with the equation above, the ratio of control time for air conditioner01is (12−4)/48, the ratio of control time for air conditioner02is (12−2)/48, the ratio of control time for air conditioner03is (12−3)/48, the ratio of control time for air conditioner04is (12−3)/48, and the ratio of control time for air conditioner05(12−0)/48. When the control time83, which is a reference value of the energy-saving control, is registered as 6 minutes, the total control time for the air conditioners in the area is 6×5=30 minutes, and the value obtained by multiplying this value with the control time ratio is actual control time.

In this example, the energy-saving control time per of time for each air conditioner is 5.0 minutes for air conditioner01, 6.25 minutes for air conditioner02, 5.625 minutes for air conditioner03, 5.625 minutes for air conditioner04and 7.5 minutes for air conditioner05.

FIG. 10illustrates a timing chart for the ON/OFF pattern of energy-saving control of air conditioners01to05that is executed during the control times found as described above. As illustrated inFIG. 10, by executing energy-saving control during a control time, it is possible to shorten the execution time for areas where there are many people, and thus it is possible to improve comfort.

Moreover, the total execution time for energy-saving control for all air conditioners in an area becomes the same as the value set by the administrator using the control time83, so that it is possible to maintain the same amount of electric power reduction as in the case of conventional energy-saving control.

In this embodiment, the control time was found by using the equations above, however, it is also possible to use a method wherein priority is assigned using a control ratio, and the control time is determined by assigning patterns in one-minute units.

Moreover, in this embodiment, the presence/absence sensors6were connected wirelessly; however, the connection is not limited to being wireless, and it possible to connect the presence/absence sensors6directly to the dedicated communication lines8, or to directly connect the sensors6to the air conditioner control device7using an LAN or the like.

Furthermore, in this embodiment, a method was employed by which an administrator inputted presence/absence correlation data93that correlated the presence/absence sensors6and air conditioners (indoor units)2. However, it is also possible to use a method wherein position information about the air conditioners (indoor units)2and presence/absence sensors6are stored together with floor plan data inside the air conditioner control device7, and the control unit60automatically generates presence/absence correlation data93from the position data.

As explained in detail above, with this embodiment, the control time during which energy-saving control is executed is increased or decreased according to the number of people, who act as heat sources, in spaces that are air conditioned by each of a plurality of air conditioners (indoor units)2. In doing so, it is possible to reduce fluctuation in temperature due to energy-saving control without changing the amount of consumed electric power that is reduced regardless of the number of people in the spaces. As a result, it is possible to suppress a drop in comfort by air conditioning, while at the same time maintaining the effect of reducing the amount of electric power consumed by energy-saving control.

Moreover, the control time for performing energy-saving control of the air conditioners is determined according to the current presence/absence status. Therefore, even when the number of people differs over time, it is possible to determine the corresponding control time for executing optimum energy-saving control. By doing so, it is possible to improve the comfort in the air-conditioned room.

In the first embodiment described above, the presence/absence sensors6were special sensors, however, in this embodiment, information processing terminals that are located in the inhabited space, for example personal computers, are used to detect the presence or absence of people.

FIG. 11illustrates an air conditioning system1of a second embodiment of the present invention. As illustratedFIG. 11, in the air conditioning system1of this second embodiment, personal computers (PC)9are provided instead of presence/absence sensors6. A collection of a plurality of PCs9is also called a PC group12.

In this embodiment, information related to the PCs9that are located in spaces air conditioned by the air conditioners (indoor units)2is stored in the memory unit50as presence/absence correlation data93of the presence/absence data53.

Special software is installed in each PC9. The PC9executes the special software and generates presence/absence information about people in the space according to whether or not there is operation input using the keyboard or mouse within a specified time, and transmits the information to the air conditioner control device7by way of a wireless adapter4.

This transmission can be in the form of a response to a request from the air conditioner control device7, or can be in the form of a notification when there was no operation input to the PC9within a fixed amount of time, or can be in the form of a periodic notification.

The air conditioner control device7receives this information, and when this information indicates that there was operation input, determines that there is a person near that PC9, and when this information indicates that there was no operation input, and that the PC is in a standby state, determines that there is no person near the PC9.

Moreover, it is possible to use various kinds of devices such as temperature sensors that operate by receiving an electric power supply from a USB terminal of the PC9, and by the operation of the devices such as temperature sensors stopping when the power supply from the USB terminal stops when the PC9is in standby, the air conditioner control device7can determine that there is no person near the PC9whose operation has stopped.

In each of the embodiments above, the timing for determining the control time is after each unit of time (for example, every 30 minutes). However, the timing for determining the control time is not limited to this. It is also possible to use a method of determining the control time in real-time.

Furthermore, in this embodiments above, when there is a large number of people in a room, the control time during which energy-saving control of the air conditioners (indoor units)2is executed is shortened. However, shortening the control time is not limited to this, and it is possible to take into consideration the amount of heat generated by the number people, and to shorten the control time during which energy-saving control of the air conditioners (indoor units)2is executed the greater the number of people there are in the case of cooling. In the case of heating, it is possible to lengthen the control time during which energy-saving control of the air conditioners (indoor units)2is executed the greater the number of people there are.

In the embodiment above, the program that is executed can be distributed on a recording medium that can be read by a computer such as a flexible disk, CD-ROM (Compact Disk Read-Only Memory), DVD (Digital Versatile Disk), MO (Magneto-Optical Disk) or the like, and the system can be created by installing that program and executing the processing described above.

Moreover, it is possible to store the program in a disk device of a specified server on a communication network such as the Internet, and to download the program by superimposing the program on a carrier wave.

When achieving the functions above by sharing by the OS (Operating System), or by the OS and applications working together, it is possible to store just the part other than the OS on a recording medium and distribute that part, or to download that part to a computer.

Various embodiments and variations of the present invention are possible within the broad spirit and scope of the invention. The embodiments described above are for explaining the present invention and do not limit the scope of the invention. In other words, the scope of the present invention is as disclosed in the claims and not the embodiments. Moreover, various modifications and variations that are within the scope of the claims or within the scope of an equivalent invention are considered to be within the scope of the present invention.

This application is based on Japanese Patent Application No. 2010-233845, filed on Oct. 18, 2010. The entire specification, claims and drawings of Japanese Patent Application No. 2010-233845 are incorporated in this specification by reference.

INDUSTRIAL APPLICABILITY

The present invention is suitable for controlling the environment of an inhabited room where a plurality of air conditioners (indoor units) is installed.

DESCRIPTION OF REFERENCE NUMERALS