Patent Publication Number: US-10309674-B2

Title: Air-conditioning control system, air-conditioning control apparatus, and air-conditioning control method

Description:
CROSS REFERENCE TO RELATED APPLICATION 
     This application claims priority to and the benefit of Japanese Patent Application No. 2015-014100 (filed on Jan. 28, 2015), the entire disclosure of which is incorporated herein by reference. 
     TECHNICAL FIELD 
     The disclosure relates to an air-conditioning control method, air-conditioning control system, and air-conditioning control apparatus for stores, buildings, factories, and the like. 
     BACKGROUND 
     Conventional air-conditioning control in a store involves measuring environmental information (e.g., temperature) in the store by environmental sensors (e.g., temperature sensors) and controlling air conditioners based on the measured environmental information. In the case of measuring environmental information in a store or a building, environmental sensors are mounted on shelves or equipment in the store to acquire environmental information close to that experienced by a body (e.g., a temperature that would be experienced by a body). A conventional technique uses environmental sensors that are capable of wireless communication and can be placed anywhere. 
     An air-conditioning control system according to an aspect of the disclosure is an air-conditioning control system provided in an area and comprising an air-conditioning control apparatus configured to control a plurality of environmental sensors which acquire environmental information in the area and a plurality of air conditioners which air-condition the area, wherein the air-conditioning control apparatus is configured to: group the plurality of environmental sensors into a plurality of groups, based on correlation coefficients between environmental information acquired by the plurality of environmental sensors; regularly calculate a correlation coefficient between environmental information acquired by one or more environmental sensors in each of the plurality of groups; reset, in the case where the calculated correlation coefficient does not exceed a first threshold, a group associated with the one or more environmental sensors; and control an air conditioner in the plurality of air conditioners that is associated with any of the plurality of groups, based on environmental information acquired by each environmental sensor in the group associated with the air conditioner. 
     An air-conditioning control apparatus according to an aspect of the disclosure is an air-conditioning control apparatus provided in an area to control a plurality of environmental sensors which acquire environmental information in the area and a plurality of air conditioners which air-condition the area based on the environmental information acquired by the plurality of environmental sensors, the air-conditioning control apparatus comprising: a group generator configured to group the plurality of environmental sensors into a plurality of groups, based on correlation coefficients between environmental information acquired by the plurality of environmental sensors; a correlation coefficient calculator configured to regularly calculate a correlation coefficient between environmental information acquired by one or more environmental sensors in each of the plurality of groups; a group reset unit configured to reset, in the case where the calculated correlation coefficient does not exceed a first threshold, a group associated with an environmental sensor; and an air conditioner controller configured to control an air conditioner in the plurality of air conditioners that is associated with any of the plurality of groups, based on environmental information acquired by each environmental sensor in the group associated with the air conditioner. 
     An air-conditioning control method according to an aspect of the disclosure is an air-conditioning control method used in an area to control a plurality of environmental sensors which acquire environmental information in the area and a plurality of air conditioners which air-condition the area, the air-conditioning control method including: grouping the plurality of environmental sensors into a plurality of groups, based on correlation coefficients between environmental information acquired by the plurality of environmental sensors; regularly calculating a correlation coefficient between environmental information acquired by one or more environmental sensors in each of the plurality of groups; resetting, in the case where the calculated correlation coefficient does not exceed a first threshold, a group associated with an environmental sensor; and controlling an air conditioner in the plurality of air conditioners that is associated with any of the plurality of groups, based on environmental information acquired by each environmental sensor in the group associated with the air conditioner. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       In the accompanying drawings: 
         FIG. 1  is an overall schematic diagram of an air-conditioning control system according to one of the disclosed embodiments; 
         FIG. 2  is a block diagram of the air-conditioning control system according to the embodiment; 
         FIG. 3A  is a graph illustrating the correlation between temperature information acquired by temperature sensors; 
         FIG. 3B  is a graph illustrating the correlation between temperature information acquired by temperature sensors; 
         FIG. 4  is an overall schematic diagram illustrating groups to which temperature sensors belong; 
         FIG. 5  is a diagram illustrating an example of a temperature sensor table indicating groups to which temperature sensors belong; 
         FIG. 6  is a diagram illustrating an example of an air conditioner table indicating groups associated with air conditioners; 
         FIG. 7  is an overall schematic diagram illustrating groups to which temperature sensors belong in the case where a temperature sensor has been moved; 
         FIG. 8  is a diagram illustrating an example of a reset temperature sensor table in the case where a temperature sensor has been moved; 
         FIG. 9  is a flowchart illustrating the initial operation of the air-conditioning control system according to the embodiment; 
         FIG. 10  is a flowchart illustrating the regular operation of the air-conditioning control system according to the embodiment; and 
         FIG. 11  is a flowchart illustrating operation relating to a group reset process. 
     
    
    
     DETAILED DESCRIPTION 
     In the case where a shelf or equipment is moved as a result of changing the layout in the store, an associated environmental sensor is also moved. In such a case, adaptive control of the air conditioners is desirable. 
     Accordingly, an aspect of the present disclosure provides an air-conditioning control system, air-conditioning control apparatus, and air-conditioning control method that can adaptively control air conditioners even in the case where an environmental sensor has been moved. 
     The following describes one of the disclosed embodiments. 
     Embodiment 
       FIG. 1  is an overall schematic diagram of an air-conditioning control system according to an embodiment of the present disclosure. In brief, the air-conditioning control system according to this embodiment includes an air-conditioning control apparatus  1 , a plurality of temperature sensors  2   a  to  2   f  (environmental sensors  2   a  to  2   f ), and a plurality of air conditioners  3   a  to  3   f . The air-conditioning control system is provided, for example, on a floor (hereafter also referred to as “area”) of a store, factory, or office.  FIG. 1  illustrates an example where the air-conditioning control system is provided in a store. Store shelves  4   a  to  4   e , lightings  5   a  to  5   e  mounted on the store shelves  4   a  to  4   e , a checkout counter  6 , and showcases  7   a  to  7   c  are arranged in the area in  FIG. 1 . The plurality of temperature sensors  2   a  to  2   f  are mounted on the top of the store shelves  4   a  to  4   e  and the top of the checkout counter  6 . The plurality of air conditioners  3   a  to  3   f  are mounted on the ceiling, and provide air-conditioning to the area based on environmental information acquired by the temperature sensors  2   a  to  2   f . In this embodiment, the environmental sensors are temperature sensors, and the environmental information is temperature information. Although in the following example the environmental sensors are temperature sensors and the environmental information is temperature information, this is not a limitation. 
       FIG. 2  is a block diagram of the air-conditioning control system according to an embodiment of the present disclosure. The air-conditioning control apparatus  1  includes a wireless communication unit  11 , a memory  12 , and a controller  13 . The temperature sensor  2   a  includes a wireless communication unit  21   a  and an environmental information acquisition unit  22   a . The wireless communication unit  21   a  communicates with the air-conditioning control apparatus  1  via a network N, to transmit temperature information acquired by the environmental information acquisition unit  22   a . For example, the temperature information is data acquired by measuring temperature 100 times at intervals of 5 minutes during the store&#39;s daily operating hours (e.g., 10:00 a.m. to 8:00 p.m.). The temperature sensors  2   b  to  2   f  have the same structure as the temperature sensor  2   a , and so their description is omitted. 
     The air-conditioning control apparatus  1  is described in detail below. The wireless communication unit  11  receives temperature information from the plurality of temperature sensors  2   a  to  2   f  via the network N. The wireless communication unit  11  also communicates with each of the air conditioners  3   a  to  3   f  via the network N, to transmit a control signal to each of the air conditioners  3   a  to  3   f.    
     The memory  12  stores various information related to the air-conditioning control apparatus  1 . In this embodiment, the plurality of temperature sensors  2   a  to  2   f  are organized in groups, as described later. Moreover, the air conditioners  3   a  to  3   f  are associated with these groups. The memory  12  stores a temperature sensor table indicating the groups to which the temperature sensors belong. The memory  12  also stores an air conditioner table indicating the groups associated with the air conditioners. These tables will be described later. 
     The controller  13  performs various controls related to the air-conditioning control apparatus  1 . The controller  13  includes a correlation coefficient calculator  131 , a group generator  132 , an air conditioner controller  133 , a group reset unit  134 , and a notification unit  135 . 
     The correlation coefficient calculator  131  calculates a correlation coefficient (hereafter also denoted by “α”) between the temperature information received from the temperature sensors  2   a  to  2   f . The correlation coefficient (α) is expressed by the following Formula (1): 
     
       
         
           
             
               
                 
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     Here, the correlation coefficient calculator  131  calculates all correlation coefficients between the respective temperature information of the temperature sensors  2   a  to  2   f . In detail, the correlation coefficient calculator  131  in this embodiment calculates a correlation coefficient between the temperature information of each of 15 different temperature sensor pairs, namely, the temperature sensors  2   a  and  2   b , the temperature sensors  2   a  and  2   c , the temperature sensors  2   a  and  2   d , the temperature sensors  2   a  and  2   e , the temperature sensors  2   a  and  2   f , the temperature sensors  2   b  and  2   c , . . . , and the temperature sensors  2   e  and  2   f.    
     The group generator  132  groups the plurality of temperature sensors  2   a  to  2   f  into a plurality of groups, based on the correlation coefficients calculated by the correlation coefficient calculator  131 . In detail, in the case where the correlation coefficient between the temperature information of temperature sensors is a predetermined value or more (e.g., 0.8 or more), the group generator  132  puts those temperature sensors into the same group.  FIGS. 3A and 3B  are graphs illustrating the correlation between temperature information acquired by temperature sensors. The coordinates of each plot are xi and yi. Each plot indicates the temperatures acquired by the temperature sensors at the same time. The horizontal axis represents the temperature acquired by one temperature sensor, and the vertical axis represents the temperature acquired by another temperature sensor.  FIG. 3A  is a graph indicating the correlation between temperature information acquired by temperature sensors in the same group. The correlation coefficient between the temperature information of the temperature sensors in  FIG. 3A  is 0.96. On the other hand, the correlation coefficient between the temperature information of the temperature sensors in  FIG. 3B  is 0.68. The temperature sensors having the correlation illustrated in  FIG. 3B  belong to different groups. 
       FIG. 4  is an overall schematic diagram illustrating the groups to which the temperature sensors belong. The plurality of temperature sensors  2   a  to  2   f  are grouped into groups G 1  to G 3 , based on the correlation coefficients. In the store illustrated in  FIG. 4 , the temperature sensors  2   a  and  2   d  located backmost in the store and near the showcase  7   b  belong to the same group G 1 . The temperature sensors  2   c  and  2   f  located on the checkout counter  6  belong to the same group G 3 . The temperature sensors  2   b  and  2   e  located between the groups G 1  and G 3  belong to the same group G 2 . This is because the average temperature and the temporal temperature change differ between the surroundings of the checkout counter  6  near the entrance and the surroundings of the showcase  7   b  away from the entrance. 
     The group generator  132  stores information about the generated groups in the memory  12 , as the temperature sensor table.  FIG. 5  is a diagram illustrating an example of the temperature sensor table indicating the groups to which the temperature sensors belong. The temperature sensor table associates temperature sensor identification information and group identification information with each other. The temperature sensor identification information is information for uniquely identifying a temperature sensor in the system. In this embodiment,  2   a  to  2   f  are respectively the temperature sensor identification information of the temperature sensors  2   a  to  2   f . The group identification information is information for uniquely identifying a group in the system. In  FIG. 5 , G 1  to G 3  are group identification information. The temperature sensors  2   a  to  2   f  are each associated with any of the groups G 1  to G 3 , as illustrated in  FIG. 5 . 
     The air conditioner controller  133  associates the plurality of groups and the air conditioners  3   a  to  3   f  with each other. In detail, the air conditioner controller  133  associates each air conditioner with any of the groups, based on the response time required for the temperature detected by each of the environmental sensors  2   a  to  2   f  to change by a predetermined temperature or more (e.g., 0.5° C. or more) in response to the operation of the air conditioner. In the example in  FIG. 4 , in the case where only the air conditioner  3   a  is operated to increase the temperature of the surroundings of the air conditioner  3   a , the temperature sensor  2   a  responds fastest and the temperature detected by the temperature sensor  2   a  increases. In this case, the air conditioner controller  133  accordingly associates the air conditioner  3   a  with the group G 1  to which the temperature sensor  2   a  belongs. In the example in  FIG. 4 , the air conditioners  3   a  and  3   d  are associated with the group G 1 . The air conditioners  3   b  and  3   e  are associated with the group G 2 . The air conditioners  3   c  and  3   f  are associated with the group G 3 . The association between the air conditioners and the groups is performed on the first day of installation of the system. 
       FIG. 6  is a diagram illustrating an example of the air conditioner table indicating the groups associated with the air conditioners  3   a  to  3   f . The air conditioner table associates air conditioner identification information and group identification information. The air conditioner identification information is information for uniquely identifying an air conditioner in the system. In this embodiment,  3   a  to  3   f  are respectively the air conditioner identification information of the air conditioners  3   a  to  3   f . The air conditioners  3   a  to  3   f  are each associated with any of the groups G 1  to G 3 , as illustrated in  FIG. 6 . 
     The air conditioner controller  133  controls each air conditioner, based on the temperature information acquired by each temperature sensor in the group associated with the air conditioner. In detail, for example, the air conditioner controller  133  controls the air conditioning by the air conditioners  3   a  and  3   d  associated with the group G 1 , based on the temperature information of the temperature sensors  2   a  and  2   d  in the group G 1 . Thus, the air-conditioning control system according to this embodiment can adaptively control the air conditioners based on the temperature information acquired by the temperature sensors. 
     Once the group generator  132  has generated the groups, the correlation coefficient calculator  131  regularly (e.g., daily) receives the temperature information of that day from each temperature sensor, and calculates the correlation coefficient between the temperature information of the temperature sensors in each group. In other words, once the group generator  132  has generated the groups, the correlation coefficient calculator  131  calculates the correlation coefficient between the temperature information of the temperature sensors in the same group, based on the temperature sensor table stored in the memory  12 . In detail, the correlation coefficient calculator  131  calculates a total of three correlation coefficients: the correlation coefficient between the temperature information of the temperature sensors  2   a  and  2   d  in the group G 1 , the correlation coefficient between the temperature information of the temperature sensors  2   b  and  2   e  in the group G 2 , and the correlation coefficient between the temperature information of the temperature sensors  2   c  and  2   f  in the group G 3 . 
     In the case where each correlation coefficient of temperature information regularly calculated by the correlation coefficient calculator  131  is a predetermined value or more (e.g., 0.8 or more), the controller  13  determines that a group reset is unnecessary. In the case where a correlation coefficient of temperature information regularly calculated by the correlation coefficient calculator  131  is less than the predetermined value, on the other hand, the controller  13  determines that a group reset is necessary. In the case where a correlation coefficient of temperature information regularly calculated by the correlation coefficient calculator  131  is less than the predetermined value, the group reset unit  134  resets the group associated with the temperature sensors. For example, in the case where the temperature sensor  2   e  has been moved from the store shelf  4   d  to the store shelf  4   e  as a result of a layout change as illustrated in  FIG. 7 , the correlation coefficient between the temperature sensors  2   b  and  2   e  decreases. The group associated with the temperature sensors is reset in such a case. 
     In detail, the group reset unit  134  calculates, for the temperature sensors (the temperature sensors  2   b  and  2   e  in the example in  FIG. 7 ) whose correlation coefficient is less than the predetermined value, the correlation coefficient between the temperature sensor and each of the other temperature sensors including the temperature sensors of the other groups (the groups G 1  and G 3  in the example in  FIG. 7 ), using the correlation coefficient calculator  131 . If there is a combination whose correlation coefficient is the predetermined value or more, the group reset unit  134  changes the temperature sensor to the same group as the group to which the other temperature sensor in the combination whose correlation coefficient is the predetermined value or more belongs. In the example in  FIG. 7 , the correlation coefficient between the temperature information of the temperature sensors  2   e  and  2   a  (or the temperature sensors  2   e  and  2   d ) is the predetermined value or more. The group reset unit  134  accordingly changes the temperature sensor  2   e  to the group G 1  to which the temperature sensor  2   a  belongs. The group reset unit  134  updates the temperature sensor table in the memory  12 .  FIG. 8  illustrates an example of the updated temperature sensor table. The group to which the temperature sensor  2   e  belongs has been changed from the group G 2  to the group G 1 , as illustrated in  FIG. 8 . 
     If there is no combination whose correlation coefficient is the predetermined value or more, the group reset unit  134  changes the temperature sensor such that it no longer belongs to any group. For example in the case where the temperature sensor  2   e  has been moved to another area such as outside the store, there will be no combination whose correlation coefficient is the predetermined value or more. 
     In the case where the group to which a temperature sensor belongs has been changed or the temperature sensor has been changed such that it no longer belongs to any group, the notification unit  135  notifies an administrator accordingly. For example, the notification unit  135  transmits an email to the administrator through the wireless communication unit  11 . Alternatively, in the case where the air-conditioning control apparatus  1  includes an interface such as a display, the notification unit  135  may display the change of the group or the like on the display to notify the administrator. In the example in  FIG. 7 , the notification unit  135  notifies, through the wireless communication unit  11 , the administrator that the group to which the temperature sensor  2   e  belongs has been changed from the group G 2  to the group G 1 , by email or the like. 
     Next, operation of the air-conditioning control system according to this embodiment will be described with reference to flowcharts in  FIGS. 9 to 11 .  FIG. 9  illustrates initial operation.  FIG. 10  illustrates regular operation after the initial operation.  FIG. 11  illustrates operation relating to a group reset process. First, the initial operation will be described. The initial operation is performed, for example, on the first day of installation of the air-conditioning control system. 
     (Initial Operation) 
     The initial operation illustrated in  FIG. 9  is described first. First, each of the environmental information acquisition units  22   a  to  22   f  of the plurality of temperature sensors  2   a  to  2   f  acquires temperature information of the surroundings on the first day. For example, each of the environmental information acquisition units  22   a  to  22   f  acquire data by measuring temperature 100 times at intervals of 5 minutes during the store&#39;s operating hours of the first day, as the temperature information. Each of the wireless communication units  21   a  to  21   f  communicates with the air-conditioning control apparatus  1  via the network N, to transmit the temperature information acquired by the environmental information acquisition units  22   a . The wireless communication unit  11  in the air-conditioning control apparatus  1  receives the temperature information from each of the plurality of temperature sensors  2   a  to  2   f  via the network N (step S 1 ). 
     Next, the correlation coefficient calculator  131  in the air-conditioning control apparatus  1  calculates the correlation coefficients between the received temperature information (step S 2 ). The correlation coefficient calculator  131  calculates all correlation coefficients between the temperature information of the temperature sensors  2   a  to  2   f.    
     Following this, the group generator  132  groups the plurality of temperature sensors  2   a  to  2   f  into a plurality of groups, based on the correlation coefficients calculated by the correlation coefficient calculator  131  (step S 3 ). The group generator  132  stores information about the generated groups in the memory  12 , as the temperature sensor table. This completes the initial operation. 
     (Regular Operation) 
     The regular operation illustrated in  FIG. 10  is described next. The regular operation illustrated in  FIG. 10  is performed, for example, on a daily basis after the initial operation. First, each of the environmental information acquisition units  22   a  to  22   f  of the plurality of temperature sensors  2   a  to  2   f  acquires the temperature information of the surroundings on the day. For example, each of the environmental information acquisition units  22   a  to  22   f  acquires data by measuring temperature 100 times at intervals of 5 minutes during the store&#39;s operating hours of the day, as the temperature information. Each of the wireless communication units  21   a  to  21   f  communicates with the air-conditioning control apparatus  1  via the network N, to transmit the temperature information acquired by the environmental information acquisition unit  22   a . The wireless communication unit  11  in the air-conditioning control apparatus  1  receives the temperature information from each of the plurality of temperature sensors  2   a  to  2   f  via the network N (step S 4 ). 
     Next, the correlation coefficient calculator  131  in the air-conditioning control apparatus  1  calculates the correlation coefficient between the temperature sensors in each group (step S 5 ). 
     Following this, in the case where each correlation coefficient of temperature information calculated by the correlation coefficient calculator  131  is a predetermined value or more (e.g., 0.8 or more), the controller  13  determines that a group reset is unnecessary (step S 6 : NO). In the case where a correlation coefficient of temperature information regularly calculated by the correlation coefficient calculator  131  is less than the predetermined value, on the other hand, the controller  13  determines that a group reset is necessary (step S 6 : YES). In this case, the air-conditioning control apparatus  1  performs a group reset process (step S 7 ). This completes the operation. 
     (Operation of Group Reset Process) 
     In the case where a correlation coefficient of temperature information calculated by the correlation coefficient calculator  131  is less than the predetermined value, the group reset process of step S 7  in  FIG. 10  is performed.  FIG. 11  is a flowchart illustrating the group reset process in detail. 
     First, the group reset unit  134  calculates, for a temperature sensor corresponding to the correlation coefficient which is less than the predetermined value, the correlation coefficient between the temperature sensor and each of the other temperature sensors including the temperature sensors outside the group, using the correlation coefficient calculator  131  (step S 701 ). 
     The group reset unit  134  then determines whether or not there is a combination whose correlation coefficient is greater than or equal to the predetermined value (step S 702 ). In the case where there is a combination whose correlation coefficient is greater than or equal to the predetermined value (step S 702 : YES), the group reset unit  134  changes the temperature sensor to the same group as the group to which the other temperature sensor in the combination whose correlation coefficient is greater than or equal to the predetermined value belongs (step S 703 ). After this, the notification unit  135  notifies the administrator that the group to which the temperature sensor belongs has been changed, by email or the like (step S 704 ). This completes the operation. 
     In the case where there is no combination whose correlation coefficient is greater than or equal to the predetermined value (step S 702 : NO), the group reset unit  134  changes the temperature sensor such that it no longer belongs to any group (step S 705 ). After this, the notification unit  135  notifies the administrator that the temperature sensor has been changed such that it no longer belongs to any group, by email or the like (step S 706 ). This completes the operation. 
     Thus, in the air-conditioning control system according to this embodiment, the temperature sensors are grouped based on correlation coefficients, and the air conditioners are controlled on a group-by-group basis. In the case where a temperature sensor has been moved, the groups are reset based on correlation coefficients. This enables adaptive control of the air conditioners even when any of the temperature sensors have been moved. In other words, this avoids the acquisition of environmental information which is different from that of the location for which environmental information was to be acquired. Moreover, there is no risk of degrading the environment of the area to which the temperature sensor has been moved. Furthermore, the location of the moved environmental sensor can be determined easily. 
     In the air-conditioning control system according to this embodiment, the correlation coefficient between the temperature information of the temperature sensors in each group is calculated in step S 5 , without calculating the correlation coefficients between all temperature sensors on the floor. This reduces the processing load on the air-conditioning control apparatus  1  in the regular operation. 
     In the air-conditioning control system according to this embodiment, the change of the group to which the temperature sensor belongs is notified. This makes it possible to estimate where the temperature sensor has been moved to, and facilitates determination of the location of the moved temperature sensor. 
     Although the embodiment describes an example where the group generator  132  groups the environmental sensors based only on correlation coefficients, this is not a limitation. The group generator  132  may group the environmental sensors based on correlation coefficients and temperature differences. In detail, in the case where the correlation coefficient between temperature sensors is greater than or equal to a predetermined value and the temperature difference in average between the temperatures acquired by the temperature sensors is less than a predetermined temperature, the group generator  132  may put the temperature sensors into the same group. Since temperature sensors that are strongly correlated but have a temperature difference greater than or equal to a predetermined temperature are not put into the same group, it is possible to put only the more closely correlated temperature sensors into the same group. Based on the temperature information acquired by the temperature sensors in each group, the air-conditioning control apparatus  1  controls each air conditioner associated with the group. More appropriate control can thus be achieved. 
     Although the embodiment describes an example where the group reset unit  134  performs the group reset process based only on correlation coefficients, this is not a limitation. The group reset unit  134  may reset the environmental sensors based on correlation coefficients and temperature differences. In detail, in the case where the correlation coefficient between temperature sensors is greater than or equal to a predetermined value and the temperature difference in average between the temperatures acquired by the temperature sensors is less than a predetermined temperature, the group generator  132  may change the group. Since temperature sensors that are strongly correlated but have a temperature difference greater than or equal to a predetermined temperature are not put into the same group, it is possible to put only the more closely correlated temperature sensors into the same group. Based on the temperature information acquired by the temperature sensors in each group, the air-conditioning control apparatus  1  controls each air conditioner associated with the group. More appropriate control can thus be achieved. 
     Moreover, in the case where the temperature acquired by a temperature sensor in the group is unchanged after a predetermined time has passed from the start of controlling the air conditioners associated with each group, the group reset unit  134  may perform a group reset only for the temperature sensor having no temperature change. In the examples shown in  FIGS. 4 and 7  according to the present embodiment, the number of temperature sensors belonging to each group is two in the initial state. In such a case, this determination is performed to omit the group reset process for the temperature sensor (the temperature sensor  2   b  in the example in  FIG. 7 ) for which no group change is necessary. This determination need not be performed in the case where the number of temperature sensors belonging to each group is three or more. 
     Although the embodiment describes an example where the group reset unit  134  calculates the correlation coefficient between the temperature sensor and each of the other temperature sensors including the temperature sensors outside the group using the correlation coefficient calculator  131  and, if there is a combination whose correlation coefficient is a predetermined value or more, changes the temperature sensor to the same group as the group to which the other temperature sensor in the combination whose correlation coefficient is the predetermined value or more belongs, this is not a limitation. For example, the group reset unit  134  may change the temperature sensor to the same group as the group to which a temperature sensor having the highest correlation coefficient with the temperature sensor belongs. The group reset unit  134  may perform a group reset process that results in the temperature sensor belonging to the same group as before the reset. The group reset unit  134  may calculate the correlation coefficient between the temperature information acquired by the temperature sensor in one day and the temperature information acquired by the same temperature sensor in the previous day. The group reset unit  134  may perform no group change in the case where the correlation coefficient is a predetermined value or more, and change the group in the case where the correlation coefficient is less than the predetermined value. 
     In the case where the values of the temperature sensors  2   a  to  2   f  do not follow air-conditioning control, air-conditioning control using the temperature sensors  2   a  to  2   f  may be canceled and switched to another control method. As an example, automatic control by the air conditioners may be performed. As another example, past (e.g., the previous day) control under the same conditions may be performed. As another example, the same control as that of neighboring air conditioners may be performed. 
     The temperature sensors  2   a  to  2   f  may each include a pressure sensor. The vertical movement of each of the temperature sensors  2   a  to  2   f  may then be detected based on the pressure detected by the temperature sensor. For example, an increase in pressure can be used to determine that the temperature sensor has dropped. 
     Although the embodiment describes an example where the air-conditioning control apparatus  1  communicates with each of the air conditioners  3   a  to  3   f  by the wireless communication unit  11  via the network N to control the air conditioner, this is not a limitation. The air-conditioning control apparatus  1  may include a wired communication interface, and utilize wired communication to control each of the air conditioners  3   a  to  3   f.    
     Although the embodiment describes an example where the environmental sensors are temperature sensors and the environmental information is temperature information, this is not a limitation. Any other types of environmental sensors and environmental information may be used. For example, the environmental sensors may be sensors for measuring environmental information such as humidity or carbon dioxide concentration, and the environmental information may be humidity information, carbon dioxide concentration information, or the like. The air conditioners to be controlled may be, for example, ventilating fans. 
     A computer may be suitably used to function as the air-conditioning control apparatus  1 . In detail, the air-conditioning control apparatus  1  can be implemented by a central processing unit (CPU) of the computer reading and executing a program that is stored in a memory of the computer and in which the processes for achieving the functions of the air-conditioning control apparatus  1  are written. 
     While the disclosed system, apparatus, and method have been described by way of the drawings and embodiments, various changes or modifications may be easily made by those of ordinary skill in the art based on the disclosure. Such various changes or modifications are therefore included in the scope of the disclosure. For example, the functions included in the means, steps, etc. may be rearranged without logical inconsistency, and a plurality of means, steps, etc. may be combined into one means, step, etc. and a means, step, etc. may be divided into a plurality of means, steps, etc. 
     Many of the disclosed aspects are described in terms of sequences of operations performed by a computer system or other hardware capable of executing program instructions. Examples of the computer system or other hardware include a general-purpose computer, a personal computer (PC), a dedicated computer, a workstation, an electronic notepad, a laptop computer, and other programmable data processing apparatuses. In each embodiment, various operations are executed by dedicated circuitry (e.g., discrete logical gates interconnected to achieve specific functions) implemented by program instructions (software) or logical blocks, program modules, or the like executed by at least one processor. Examples of the at least one processor executing logical blocks, program modules, or the like include at least one microprocessor, central processing unit (CPU), application specific integrated circuit (ASIC), digital signal processor (DSP), programmable logic device (PLD), field programmable gate array (FPGA), controller, microcontroller, electronic device, other apparatuses designed to execute the functions described herein, and/or any combination thereof. The embodiments described herein are implemented, for example, by hardware, software, firmware, middleware, microcode, or any combination thereof. 
     Examples of the network used herein include, unless otherwise specified, the Internet, an ad hoc network, a local area network (LAN), other networks, or any combination thereof. The components of the wireless network include, for example, an access point (such as a Wi-Fi access point) and a femtocell. 
     The system is disclosed herein as having various modules and/or units for executing specific functions. These modules and units are schematically illustrated to simplify the description of its functionality, and do not necessarily represent specific hardware and/or software. In this regard, the modules, units, and other components may be hardware and/or software implemented to substantially execute the specific functions described herein. Various functions of different components may be any combination or separate ones of hardware and/or software, and may be used separately or in combination. Thus, the disclosed various aspects may be embodied in many different forms, and all such embodiments are within the scope of the disclosure. 
     REFERENCE SIGNS LIST 
     
         
         
           
               1  air-conditioning control apparatus 
               2   a  to  2   f  temperature sensor 
               3   a  to  3   f  air conditioner 
               4   a  to  4   e  store shelf 
               5   a  to  5   e  lighting 
               6  checkout counter 
               7   a  to  7   c  showcase 
               11  wireless communication unit 
               12  memory 
               13  controller 
               21   a  to  21   f  wireless communication unit 
               22   a  to  22   f  environmental information acquisition unit 
               131  correlation coefficient calculator 
               132  group generator 
               133  air conditioner controller 
               134  group reset unit 
               135  notification unit 
             N network