Patent Publication Number: US-2023151995-A1

Title: Environmental control system

Description:
FIELD 
     The present disclosure relates to an environmental control system. 
     BACKGROUND 
     An environmental control system is disclosed in PTL 1. The environmental control system disclosed in PTL 1 uses an environment forming device such as an electric fan or an air conditioner configured to form an airflow to direct the airflow toward a worker, thereby improving the work efficiency of the worker. 
     CITATION LIST 
     Patent Literature 
     [PTL 1] JP 2016-171840 A 
     SUMMARY 
     Technical Problem 
     In the technique disclosed in PTL 1 described above, in the case where a worker is located away from the environment forming device configured to form an airflow, it is difficult to direct an airflow of a sufficient strength toward the worker. In the technique disclosed in PTL 1 described above, in the case where a worker is located away from the environment forming device, the effect of improving the work efficiency cannot be sufficiently obtained. 
     The present disclosure has been made in order to solve the problems described above. An object of the present disclosure is to provide an environmental control system that can reliably achieve the effect of improving the work efficiency of a worker. 
     Solution to Problem 
     An environmental control system according to the present disclosure comprises a first air conditioner body having a plurality of air outlets, a human body detector for detecting a human body, and a system controller for controlling the first air conditioner body. The system controller executes a first control when a distance from a human body detected by the human body detector to the first air conditioner body is a first distance, and executes a second control when a distance from a human body detected by the human body detector to the first air conditioner body is a second distance larger than the first distance. The first air conditioner body blows air from one of the air outlets toward the human body detected by the human body detector when the first control is executed, and blows air from at least two of the air outlets toward the human body detected by the human body detector when the second control is executed. 
     In addition, an environmental control system according to the present disclosure comprises a first air conditioner body having a plurality of air outlets, and one fan for sending an airflow to the plurality of air outlets, a human body detector for detecting a human body, and a system controller for controlling the first air conditioner body. The system controller executes a first control when a distance from a human body detected by the human body detector to the first air conditioner body is a first distance, and executes a second control when a distance from a human body detected by the human body detector to the first air conditioner body is a second distance larger than the first distance. The first air conditioner body blows air at a first airflow speed toward the human body detected by the human body detector when the first control is executed, and closes at least one of the air outlets and blows air at a second airflow speed toward the human body detected by the human body detector, the second airflow speed being greater than the first airflow speed, when the second control is executed. 
     In addition, an environmental control system according to the present disclosure comprises a first air conditioner body, a second air conditioner body, a human body detector for detecting a human body, and a system controller for controlling the first air conditioner body and the second air conditioner body. The system controller executes a first control when a distance from a human body detected by the human body detector to the first air conditioner body is a first distance, and executes a second control when a distance from a human body detected by the human body detector to the first air conditioner body is a second distance larger than the first distance. The first air conditioner body blows air toward the human body detected by the human body detector when the first control is executed, and the first air conditioner body and the second air conditioner body blow air toward the human body detected by the human body detector when the second control is executed. 
     Furthermore, an environmental control system according to the present disclosure comprises a first air conditioner body capable of blowing air toward a first area, a second air conditioner body capable of blowing air toward a second area different from the first area, a human body detector for detecting human bodies that are present in the first area and the second area, and a system controller for controlling the first air conditioner body and the second air conditioner body according to the number of human bodies in the first area and the number of human bodies in the second area, the human bodies being detected by the human body detector. The system controller causes the first air conditioner body and the second air conditioner body to blow air toward the human body in the first area when the number of human bodies in the first area is equal to or larger than a reference value and the number of human bodies in the second area is less than a reference value. 
     Advantageous Effects of Invention 
     The environmental control according to the present disclosure can reliably achieve the effect of improving the work efficiency of a worker. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
         FIG.  1    is a perspective view of an air conditioner body comprising an air conditioner constituting an environmental control system of Embodiment 1. 
         FIG.  2    is diagram illustrating an internal structure of a louver included in the air conditioner body of Embodiment 1. 
         FIG.  3    is a diagram schematically illustrating a configuration of the air conditioner body of Embodiment 1. 
         FIG.  4    is a block diagram illustrating a control system of the environmental control system of Embodiment 1. 
         FIG.  5    is a diagram illustrating an example of a configuration for implementing functions of a system controller according to the present disclosure. 
         FIG.  6    is diagram illustrating a first operation of the air conditioner body of Embodiment 1. 
         FIG.  7    is diagram illustrating a second operation of the air conditioner body of Embodiment 1. 
         FIG.  8    is a diagram illustrating a first variant of the environmental control system of Embodiment 1. 
         FIG.  9    is a diagram illustrating a second variant of the environmental control system of Embodiment 1. 
         FIG.  10    is a flowchart illustrating an operation example of the environmental control system of Embodiment 1. 
         FIG.  11    is a diagram illustrating an operation of an environmental control system of Embodiment 2. 
         FIG.  12    is a diagram illustrating an operation of an environmental control system of Embodiment 3. 
         FIG.  13    is a diagram illustrating an operation of an environmental control system of Embodiment 4. 
     
    
    
     DESCRIPTION OF EMBODIMENTS 
     Hereinafter, embodiments will be described with reference to the accompanying drawings. The same reference numerals in the drawings indicate the same or corresponding portions. In addition, in the present disclosure, redundant descriptions are simplified or omitted as appropriate. Note that the present disclosure is not limited to the following embodiments. The present disclosure may include various variants and combinations of configurations disclosed by the following embodiments without departing from the gist thereof. 
     Embodiment 1 
     An environmental control system according to the present embodiment sends air to a user in a target area to thereby suppress a reduction in the work efficiency of the user or improve the work efficiency of the user. The environmental control system according to the present embodiment includes an air conditioner capable of sending air into a target area. Note that the environmental control system according to the present disclosure may be constituted by only an air conditioner or may be constituted by an air conditioner and an external device cooperating with the air conditioner. 
       FIG.  1    is a perspective view of an air conditioner body  1  comprising an air conditioner constituting an environmental control system of Embodiment 1.  FIG.  2    is a diagram illustrating an internal structure of a louver included in the air conditioner body  1  of Embodiment 1.  FIG.  2    illustrates the internal structure of a portion A enclosed by a broken line in  FIG.  1   .  FIG.  3    is a diagram schematically illustrating a configuration of the air conditioner body  1  of Embodiment 1.  FIG.  3 ( a )  is a plan view schematically illustrating a configuration of the air conditioner body  1  of Embodiment 1.  FIG.  3 ( b )  is a side view schematically illustrating a configuration of the air conditioner body  1  of Embodiment 1. 
     The air conditioner body  1  is a device also referred to as an “indoor unit.” The air conditioner body  1  is mounted in a ceiling surface of a room in which a space serving as a target area is formed, for example. The air conditioner body  1  corresponds to a first air conditioner body included in the environmental control system according to the present disclosure. 
     The air conditioner body  1  can execute air-conditioning operation including cooling operation for blowing cooling air, heating operation for blowing warm air, and air-sending operation for blowing air of ambient temperature. The air conditioner body  1  according to the present embodiment can execute a work efficiency improvement operation for blowing air to a user. 
     The air conditioner body  1  includes a housing  30 . The housing  30  of the air conditioner body  1  is formed into a rectangular parallelepiped box shape. A lower panel  31  having a rectangular shape is provided in a lower portion of the housing  30  of the air conditioner body  1 . An air inlet  5  is formed in the lower panel  31 . The air inlet  5  is an opening for taking air into the housing  30  from the outside. As an example, the air inlet  5  is arranged at a center of the lower panel  31 . 
     Air outlets  20  are formed in the lower panel  31 . The air outlet  20  is an opening for blowing air from the inside of the housing  30  to the outside. In the present embodiment, four air outlets  20  are formed in the lower panel  31 , as an example. Each of the four air outlets  20  is provided along the corresponding side of the lower panel  31 . The environmental control system according to the present embodiment includes the air conditioner body  1  in which a plurality of air outlets  20  are formed. 
     An outdoor unit is connected to the air conditioner body  1  via piping through which refrigerant flows. The piping and the outdoor unit are not illustrated in the present disclosure. 
     An air passage from the air inlet  5  to the air outlets  20  is formed in the housing  30 . A heat exchanger  21  is provided in the air passage from the air inlet  5  to the air outlets  20 . The heat exchanger  21  heats or cools air by heat exchange between the refrigerant and the air flowing through the air passage. Whether the air is heated or cooled by the heat exchanger  21  is determined by the type of air-conditioning operation executed by the air conditioner. The heat exchanger  21  adjusts the temperature and humidity of air by heating or cooling the air, and generates conditioned air. Specifically, the heat exchanger  21  heats the air during the heating operation. The heat exchanger  21  cools the air during the cooling operation. The air having passed through the heat exchanger  21  is generated as conditioned air of ambient temperature during the air-sending operation. 
     The air conditioner body  1  includes a fan  22  for blowing air from the air outlets  20 . The fan  22  is provided in the air passage from the air inlet  5  to the air outlets  20 . The fan  22  generates an airflow from the air inlet  5  to the air outlets  20 . 
     When the fan  22  operates, the air is sucked through the air inlet  5 , and is blown from the air outlets  20 . 
     In the present embodiment, the air conditioner body  1  includes, as an example, one fan  22  that can send the airflow to the plurality of air outlets  20 . Note that the first air conditioner body included in the environmental control system according to the present disclosure may include a plurality of fans  22 . 
     As illustrated in  FIGS.  1 ,  2 , and  3   , the air conditioner body  1  includes up-and-down louvers  2  and left-and-right louvers  4 . The up-and-down louver  2  and the left-and-right louver  4  are provided in each of the plurality of air outlets  20 . The up-and-down louver  2  is configured to adjust a blowing angle in an up-and-down direction of the air to be blown from the air outlet  20 . The left-and-right louver  4  is configured to adjust a blowing angle in a left-and-right direction of the air to be blown from the air outlet  20 . The air conditioner body  1  can send the air in various directions by changing a combination between orientation of the up-and-down louver  2  and orientation of the left-and-right louver  4 . 
     In the present embodiment, the up-and-down louver  2  is configured to allow the air outlets  20  to be closed. In the state illustrated in  FIG.  1   , the air outlets  20  are closed by the respective up-and-down louvers  2 . In the air conditioner body  1  according to the present embodiment, some air outlets  20  of the plurality of air outlets  20  can be closed by the up-and-down louvers  2 , to thereby stop air sending from those air outlets  20 . 
     As illustrated in  FIG.  1   , in the present embodiment, a surface temperature sensor  3  is attached to the lower panel  31 . The surface temperature sensor  3  can detect a surface temperature of an object in a target area in a non-contact manner. 
     The surface temperature sensor  3  scans inside of a target area to obtain surface temperature distribution data of the inside of the target area. The surface temperature distribution data is also referred to as heat image data. The detected surface temperature distribution data acquired by the surface temperature sensor  3  is processed by a controller section  6  or the like, which will be described later. This makes it possible to detect a position of the human body that is present in the target area. The surface temperature sensor  3  in the present embodiment constitutes an example of a human body detector for detecting a human body. 
     Note that a method of detecting a human body in the target area is not limited to a method performed by obtaining heat image data using the surface temperature sensor  3 . In the present disclosure, a human body may be detected by, for example, obtaining actual image data using a camera and processing the obtained actual image data. The human body detector according to the present disclosure is not limited to the surface temperature sensor  3 , and may be constituted by the above-described camera, another human sensor provided in the target area, a wearable sensor to be worn by a user, or the like. An apparatus such as the surface temperature sensor  3  or the camera constituting the human body detector according to the present disclosure may be provided outside the air conditioner body  1 . 
       FIG.  4    is a block diagram illustrating a control system of the environmental control system of Embodiment 1. The environmental control system of the present embodiment includes the controller section  6  and a control circuit substrate  11 . The controller section  6  and the control circuit substrate  11  are included, as an integrated device, in the air conditioner body  1 . Alternatively, the controller section  6  and the control circuit substrate  11  may be provided as an external device of the air conditioner body  1 . One of the controller section  6  and the control circuit substrate  11  may be provided in the air conditioner body  1  and the other may be provided as the external device. The controller section  6  and the control circuit substrate  11  constitute an example of a system controller according to the present disclosure. 
     The controller section  6  processes the surface temperature distribution data output from the surface temperature sensor  3 . The controller section  6  includes, for example, an information obtaining unit  7  and a human position determination unit  8 . 
     The information obtaining unit  7  obtains the surface temperature distribution data output from the surface temperature sensor  3 . The human position determination unit  8  determines a position of a human body in the target area on a basis of the surface temperature distribution data obtained by the information obtaining unit  7 . The human position determination unit  8  determines a position of a human body from a difference in the surface temperature, a distribution shape of the surface temperature and the like. 
     The environmental control system according to the present embodiment may include a temperature sensor  3   a  for detecting a room temperature of the target area. The data of the room temperature detected by the temperature sensor  3   a  is obtained by the information obtaining unit  7 . The controller section  6  may include a room temperature determination unit  9 . The room temperature determination unit  9  determines whether the room temperature becomes a set temperature of the air conditioner, on the basis of the data of the room temperature obtained by the information obtaining unit  7 . The air conditioner constituting the environmental control system according to the present embodiment may be configured to perform an air-conditioning operation on the basis of the determination result of the room temperature determination unit  9 . 
     A control circuit for controlling the entire operation of the air conditioner body  1  is mounted on the control circuit substrate  11 . The control circuit substrate  11  includes, for example, an information processing unit  12 , a controller  13 , an airflow direction controller  14 , an air volume controller  15 , and an air outlet opening and closing controller  16 . 
     The airflow direction controller  14  controls the operation of an airflow direction adjusting unit  17  included in the air conditioner body  1  to thereby control an airflow direction of air blown from each air outlet  20 . The airflow direction adjusting unit  17  is configured to adjust an airflow direction of air blown from each air outlet  20 . The airflow direction adjusting unit  17  specifically includes devices such as the up-and-down louvers  2 , the left-and-right louvers  4 , and a motor (not illustrated) for operating each louver. 
     The air volume controller  15  controls the operation of an air volume adjusting unit  18  included in the air conditioner body  1  to thereby control the air volume and airflow speed of air blown from each air outlet  20 . The air volume adjusting unit  18  is configured to adjust the air volume and airflow speed of air blown from each air outlet  20 . The air volume adjusting unit  18  specifically includes devices such as the fan  22 , and a motor (not illustrated) for driving the fan  22 . 
     The air outlet opening and closing controller  16  controls the operation of an air outlet opening and closing unit  19  included in the air conditioner body  1  to thereby open and close the air outlets  20 . The air outlet opening and closing unit  19  is configured to open and close any of the plurality of air outlets  20 . The air outlet opening and closing unit  19  specifically includes devices such as the up-and-down louvers  2  and a motor (not illustrated) for driving the up-and-down louvers  2 . Alternatively, the air outlet opening and closing unit  19  may include, for example, members different from the up-and-down louver  2 . The air conditioner body  1  may include members for opening and closing the air outlets  20  in addition to the up-and-down louvers  2  for adjusting the airflow direction. 
     The information processing unit  12  determines control contents of the air conditioner body  1  on the basis of the information about the position of the human body detected by the surface temperature sensor  3  and the controller section  6 . The controller  13  outputs a specific control command to the airflow direction controller  14 , the air volume controller  15 , and the air outlet opening and closing controller  16  according to the control contents determined by the information processing unit  12 . The airflow direction controller  14 , the air volume controller  15 , and the air outlet opening and closing controller  16  control the operations of the airflow direction adjusting unit  17 , the air volume adjusting unit  18 , and the air outlet opening and closing unit  19  according to the control command from the controller  13 . 
     The information processing unit  12  has, as a specific function, a function of determining the control contents of the air conditioner body  1  according to a distance from a human body to the air conditioner body  1 . In the present disclosure, the distance from a human body to the air conditioner body  1  is defined as a distance from the human body to a reference point of the air conditioner body  1 . The reference point is set as, for example, a center of the air conditioner body  1 . Alternatively, the reference point may be set as a position of the air outlet  20  closest to the human body. The above-described reference point may be set at any position according to the specifications of the human body detector such as the surface temperature sensor  3 . 
       FIG.  5    is a diagram illustrating an example of a configuration for implementing the functions of a system controller according to the present disclosure. The functions of the controller section  6  and the control circuit substrate  11  that constitute an example of the system controller are implemented by a processing circuit, for example. The processing circuit may be dedicated hardware  40 . The processing circuit may include a processor  41  and a memory  42 . A part of the processing circuit is formed as the dedicated hardware  40 , and the processing circuit may further include the processor  41  and the memory  42 . In the example illustrated in  FIG.  5   , a part of the processing circuit is formed as the dedicated hardware  40 . In the example illustrated in  FIG.  5   , the processing circuit further includes the processor  41  and the memory  42 . 
     The processing circuit, a part of which is at least one piece of dedicated hardware  40 , is, for example, a single circuit, a complex circuit, a programmed processor, a parallel programmed processor, an ASIC, an FPGA, or a combination thereof. 
     When the processing circuit includes at least one processor  41  and at least one memory  42 , the functions of the controller section  6  and the control circuit substrate  11  is implemented by software, firmware, or a combination of software and firmware. 
     Software and firmware are written as programs and stored in the memory  42 . The processor  41  reads out and executes the programs stored in the memory  42  to implement the functions of individual units. The processor  41  is also referred to as a central processing unit (CPU), a central processing unit, a processing unit, an arithmetic unit, a microprocessor, a microcomputer, or a DSP. The memory  42  is, for example, a non-volatile or volatile semiconductor memory such as a RAM, a ROM, a flash memory, an EPROM, and an EEPROM, or is, for example, a magnetic disk, a flexible disk, an optical disc, a compact disc, a mini disc, and a DVD. 
     In this manner, the processing circuit can implement the functions of the controller section  6  and the control circuit substrate  11  that constitute an example of the system controller, by hardware, software, firmware, or a combination thereof. 
     As described above, the air conditioner body  1  can execute a work efficiency improvement operation. The work efficiency improvement operation refers to an operation for blowing air toward a user, i.e., a human body. The work efficiency improvement operation can suppress a reduction in the work efficiency of the user or improve the work efficiency of the user. As an example, the air conditioner body  1  executes the air-sending operation to thereby blow air of the ambient temperature from the air outlet  20  toward the human body at the time of executing the work efficiency improvement operation. 
     Alternatively, the air conditioner body  1  may perform the cooling operation for blowing cooling air at the time of executing the work efficiency improvement operation. For example, in the case where the room temperature is below a predetermined temperature, the air conditioner body  1  may perform the heating operation for blowing warm air at the time of executing the work efficiency improvement operation. In the following, as an example, there will be described specific examples of the operations and controls of an air conditioner body  1  that performs the air-sending operation at the time of executing the work efficiency improvement operation, and the environmental control system including the air conditioner body  1 . 
     In the present embodiment, the controller section  6  and the control circuit substrate  11  that constitute an example of the system controller execute a first control when a distance from a human body detected by the surface temperature sensor  3  to the air conditioner body  1  is a first distance. In addition, the controller section  6  and the control circuit substrate  11  execute a second control when a distance from a human body detected by the surface temperature sensor  3  to the air conditioner body  1  is a second distance larger than the above-described first distance. 
     The above-described first distance is less than a preset first threshold D 1 . The above-described second distance is equal to or larger than the first threshold D 1 . That is, the controller section  6  and the control circuit substrate  11  execute the first control when a distance from a human body detected by the surface temperature sensor  3  to the air conditioner body  1  is less than the first threshold D 1 . The controller section  6  and the control circuit substrate  11  execute the second control when a distance from a human body detected by the surface temperature sensor  3  to the air conditioner body  1  is equal to or larger than the first threshold D 1 . 
     When the above-described first control is executed, the air conditioner body  1  executes a first operation.  FIG.  6    is diagram illustrating the first operation of the air conditioner body  1  of Embodiment 1. When the above-described second control is executed, the air conditioner body  1  executes a second operation.  FIG.  7    is diagram illustrating the second operation of the air conditioner body  1  of Embodiment 1. In  FIGS.  6  and  7   , each arrow indicates a flow of air blown by the air conditioner body  1 . 
     As illustrated in  FIG.  6   , the first operation is an operation for blowing air from one air outlet  20  to a human body. When a plurality of workers are present in the target area, the air is blown toward each worker. At this time, as illustrated in  FIG.  6   , the air conditioner body  1  may blow air from the air outlet  20  closest to a human body toward the human body. 
     As illustrated in  FIG.  7   , the second operation is an operation for blowing air from at least two air outlets  20 , i.e., a plurality of air outlets  20  toward a human body. In this way, the air conditioner body  1  included in the control system according to the present embodiment performs the second operation for blowing air from the plurality of air outlets  20  toward a human body far away from the air conditioner body  1  by the first threshold D 1  or larger. According to the above-described second operation, the airflow of a sufficient strength can be directed toward a worker far away from the air conditioner body  1 . In this way, the present embodiment can provide an environmental control system that can reliably achieve the effect of improving the work efficiency of a worker. 
     Note that, as illustrated in  FIG.  7   , the air conditioner body  1  may perform, in parallel, the first operation and the second operation. The air conditioner body  1  may blow air from one air outlet  20  toward a human body separated from the air conditioner body  1  by less than the first threshold D 1  while blowing air from a plurality of air outlets  20  toward a human body far away from the air conditioner body  1  by the second distance equal to or larger than the first threshold D 1 . That is, the above-described first control and second control may be performed in parallel. 
     As illustrated in  FIG.  7   , the air conditioner body  1  may close at least one air outlet  20  when the second control is executed to execute the second operation. Closing at least one air outlet  20  makes it possible to increase the airflow speed of the air blown by the air conditioner body  1  without increasing the output of the fan  22 . At this time, it is desirable that the air outlet  20  to be closed does not face a direction from the air conditioner body  1  toward a worker. It is desirable that the air outlet  20  to be closed is selected according to the position of the human body detected by the surface temperature sensor  3 . 
       FIG.  8    is a diagram illustrating a first variant of the environmental control system of Embodiment 1. As illustrated in the variant of  FIG.  8   , an environmental control system of the present embodiment may further include an air conditioner body  1   a  different from the air conditioner body  1 . The air conditioner body  1   a  corresponds to a second air conditioner body included in the environmental control system according to the present disclosure. Note that the second air conditioner body according to the present disclosure may have different specifications from those of the air conditioner body  1   a . The second air conditioner body may include, for example, one air outlet. 
     The air conditioner body  1   a  has the same configuration as that of the air conditioner body  1 , as an example. The operation of the air conditioner body  1   a  is controlled by a controller section  6  and a control circuit substrate  11  that constitute an example of the system controller as illustrated in  FIG.  4   , for example. 
     In the first variant illustrated in  FIG.  8   , the controller section  6  and the control circuit substrate  11  execute a third control when a distance from a human body detected by the surface temperature sensor  3  to the air conditioner body  1  is a third distance larger than the second distance. The above-described third distance is equal to or larger than a preset second threshold D 2 . In the first variant, the above-described second distance is less than the second threshold D 2 . The second threshold D 2  is set as a value larger than the first threshold D 1 . 
     As illustrated in  FIG.  8   , when the third control is executed, both of the air conditioner body  1  and the air conditioner body  1   a  blow air toward a human body far away from the air conditioner body  1  by the second threshold D 2  or larger. According to the first variant, air is sent from another air conditioner body  1   a  to a worker far away from the air conditioner body  1 , which makes it possible to direct an airflow of a sufficient strength to the worker. 
     As described above, the air conditioner body  1   a  has the same configuration as that of the air conditioner body  1 , as an example. At this time, the air conditioner body  1   a  may execute a first operation for blowing air from one air outlet  20  and a second operation for blowing air from a plurality of air outlets  20  in the same manner as in the air conditioner body  1 . For example, the controller section  6  and the control circuit substrate  11  execute a first control when a distance from a human body to the air conditioner body  1   a  is a fourth distance, and execute a second control when a distance from a human body to the air conditioner body  1   a  is a fifth distance larger than the above-described fourth distance. The fourth distance is less than a preset third threshold D 3 . The fifth distance is equal to or larger than the third threshold D 3 . The air conditioner body  1   a  may execute a first operation when a distance from a human body to the air conditioner body  1   a  is less than the third threshold D 3 . The air conditioner body  1   a  may execute a second operation when a distance from a human body to the air conditioner body  1   a  is equal to or larger than the third threshold D 3 . Note that the third threshold D 3  may be equal to or different from the first threshold D 1 . 
     When the air conditioner body  1   a  has the same configuration as that of the air conditioner body  1  as described above, the controller section  6  and the control circuit substrate  11  may execute the third control when a distance from a human body to the air conditioner body  1  is the third distance and a distance from the human body to the air conditioner body  1   a  is a sixth distance. The sixth distance is equal to or larger than the fourth threshold D 4 . In the present variant, the above-described fifth distance is less than the fourth threshold D 4 . That is, as illustrated in  FIG.  8   , the controller section  6  and the control circuit substrate  11  may execute the third control when a distance from a human body to the air conditioner body  1  is equal to or larger than the second threshold D 2  and a distance from the human body to the air conditioner body  1   a  is equal to or larger than the fourth threshold D 4 . According to the present variant, the effect of more reliably improving the work efficiency of a worker can be obtained regardless of a position of the worker with respect to the air conditioner body  1  and the air conditioner body  1   a . Note that the fourth threshold D 4  may be equal to or different from the above-described second threshold D 2 . 
     As illustrated in  FIG.  8   , the air conditioner body  1  may close at least one air outlet  20  when the third control is executed. This makes it possible to increase the airflow speed of the air blown by the air conditioner body  1  without increasing the output of the fan  22 , in the same manner as in the example illustrated in  FIG.  7   . It is desirable that the air outlet  20  to be closed does not face a direction from the air conditioner body  1  toward a worker. The air conditioner body  1   a  having the same configuration as that of the air conditioner body  1  may close at least one air outlet  20  when the third control is executed. 
       FIG.  9    is a diagram illustrating a second variant of the environmental control system of Embodiment 1. In the second variant, a value of the above-described first threshold D 1  is variable depending on a position of a human body with respect to the air conditioner body  1 . Specifically, in the case where an apparent area of an air outlet  20  closest to a human body when the air outlet  20  is viewed from the human body is a first area, the first threshold D 1  is set to be smaller as compared to the case where an apparent area of an air outlet  20  closest to a human body when the air outlet  20  is viewed from the human body is a second area larger than the first area. 
       FIG.  9 ( a )  illustrates a state in which an apparent area of an air outlet  20  closest to a human body when the air outlet  20  is viewed from the human body is the second area larger than the first area. That is, the state means a state in which a human body is present within a predetermined angle range A with respect to the front direction of the air outlet  20 . The angle range A is set with respect to the center of the air outlet  20  or the center of the air conditioner body  1 , for example. 
     On the other hand,  FIG.  9 ( b )  illustrates a state in which an apparent area of an air outlet  20  closest to a human body when the air outlet  20  is viewed from the human body is the first area smaller than the second area. That is, the state means a state in which a human body is present outside the above-described angle range A with respect to the front direction of the air outlet  20 . A first threshold D 1  in the state of  FIG.  9 ( b )  is set to be smaller than the first threshold D 1  in the state of  FIG.  9 ( a ) . According to the second variant illustrated in  FIG.  9   , when a worker is present at a position on a left or right side with respect to the front direction of the air outlet  20  or at a place where an airflow from the air outlet  20  is hard to reach, the first threshold D 1  is reduced, which makes it possible to direct the airflow of a sufficient strength toward the worker. 
     Note that the first threshold D 1  may change discontinuously depending on whether a human body is present within the predetermined angle range A as described above or may change continuously depending on a position of a human body with respect to the front direction of the air outlet  20 . For example, the first threshold D 1  may change continuously depending on the magnitude of the apparent area of an air outlet  20  closest to a human body when the air outlet  20  is viewed from the human body. In addition, in the case where an apparent area of an air outlet  20  closest to a human body when the air outlet  20  is viewed from the human body is a first area, the second threshold D 2  may be also set to be smaller as compared to the case where an apparent area of an air outlet  20  closest to a human body when the air outlet  20  is viewed from the human body is a second area larger than the first area, in the same manner as the first threshold D 1 . The second threshold D 2  in the state of  FIG.  9 ( b )  is set to be smaller than the second threshold D 2  in the state of  FIG.  9 ( a ) . 
       FIG.  10    is a flowchart illustrating an operation example of the environmental control system of Embodiment 1. As an example, the environmental control system first obtains a room temperature from the temperature sensor  3   a , the information obtaining unit  7 , and the like (step S 101 ). Next, the environmental control system obtains positional information of a worker from the surface temperature sensor  3 , the information obtaining unit  7 , and the like (step S 102 ). 
     Next, it is determined whether a room temperature has reached a target temperature, on the basis of the information about the room temperature obtained in step S 101  (step S 103 ). The target temperature is set according to the set temperature of the air conditioner body constituting the environmental control system, and the like. When the room temperature does not reach the target temperature, the cooling operation or the heating operation is executed by the air conditioner body  1  according to the room temperature (step S 104 ). The processing from step S 101  to step S 104  is continued until the room temperature reaches the target temperature. 
     When the room temperature reaches the target temperature, the work efficiency improvement operation is executed by the air conditioner body  1 . At this time, the first threshold D 1  and the second threshold D 2  that are thresholds of a distance may be set according to the positional information of the worker obtained in step S 102  (step S 105 ). The first threshold D 1  and the second threshold D 2  are set as in the example of  FIG.  9   , for example. 
     At the time of executing the work efficiency improvement operation, the control contents of the operation of the air conditioner body  1  are determined on the basis of the positional information of the worker, the first threshold D 1 , the second threshold D 2 , and the like (step  106 ). The controller section  6  and the control circuit substrate  11  that constitute an example of the system controller appropriately executes the above-described first control, second control or third control on the basis of the positional information of the worker, the first threshold D 1 , the second threshold D 2 , and the like. The air-sending operation is performed by the air conditioner body  1  according to the control contents of the controller section  6  and the control circuit substrate  11  (step S 107 ). In this manner, the airflow can be provided to the worker. Note that the flowchart in  FIG.  10    is merely an example of the operation, and an operational flow of the environmental control system according to the present disclosure is not limited to this example. 
     As described above, Embodiment 1 and each variant can provide an environmental control system that can reliably achieve the effect of improving the work efficiency of a worker. 
     Embodiment 2 
     Next, Embodiment 2 will be described. As for the same or equivalent components as or to those in Embodiment 1, the description is simplified or omitted. Hereinafter, the description will be made mainly focusing on differences from Embodiment 1. 
       FIG.  11    is a diagram illustrating an operation of an environmental control system of Embodiment 2. The environmental control system according to the present embodiment includes an air conditioner body  1  which is an example of a first air conditioner body in the same manner as in Embodiment 1. The air conditioner body  1  executes a work efficiency improvement operation for blowing air from an air outlet  20  toward a human body. 
     In the present embodiment, a controller section  6  and a control circuit substrate  11  that constitute an example of the system controller execute a first control when a distance from a human body detected by a surface temperature sensor  3  to the air conditioner body  1  is a first distance. In addition, the controller section  6  and the control circuit substrate  11  execute a second control when a distance from a human body detected by the surface temperature sensor  3  to the air conditioner body  1  is a second distance larger than the above-described first distance. The first distance is less than a first threshold D 1 , and the second distance is equal to or larger than the first threshold D 1 . The first threshold D 1  is a threshold of a distance in the same manner as in Embodiment 1. 
     The first control in the present embodiment is different from the first control in Embodiment 1. Similarly, the second control in the present embodiment is different from the second control in Embodiment 1. Specifically, the air conditioner body  1  blows air at a first airflow speed toward the human body detected by the surface temperature sensor  3  which is an example of the human body detector, when the first control is executed. The air conditioner body  1  blows air at a second airflow speed toward the human body detected by the surface temperature sensor  3 , the second airflow speed being greater than the first airflow speed, when the second control is executed. That is, the air conditioner body  1  of the present embodiment blows air at greater second airflow speed toward a human body far away from the air conditioner body  1  by the first threshold D 1  or larger. This can reliably achieve the effect of improving the work efficiency of a worker far away from the air conditioner body  1 . 
     Furthermore, in the present embodiment, the air conditioner body  1  closes at least one air outlet  20  when the second control is executed. This enables the air conditioner body  1  to blow stronger air. Note that it is desirable that the air outlet  20  to be closed does not face a direction from the air conditioner body  1  toward a worker. 
     Embodiment 3 
     Next, Embodiment 3 will be described. As for the same or equivalent components as or to those in each embodiment as described above, the description is simplified or omitted. Hereinafter, the description will be made mainly focusing on differences from each embodiment as described above. 
       FIG.  12    is a diagram illustrating an operation of an environmental control system of Embodiment 3. The environmental control system according to the present embodiment includes an air conditioner body  1  and an air conditioner body  1   a  in the same manner as in the first variant illustrated in  FIG.  8    in Embodiment 1. The air conditioner body  1  and the air conditioner body  1   a  execute a work efficiency improvement operation for blowing air toward a human body. Note that in the present embodiment, the air conditioner body  1  which is an example of the first air conditioner body may include one air outlet. Similarly, the air conditioner body  1   a  which is an example of the second air conditioner body may also include one air outlet. 
     In the present embodiment, a controller section  6  and a control circuit substrate  11  that constitute an example of the system controller execute a first control when a distance from a human body detected by a surface temperature sensor  3  to the air conditioner body  1  is a first distance. In addition, the controller section  6  and the control circuit substrate  11  execute a second control when a distance from a human body detected by the surface temperature sensor  3  to the air conditioner body  1  is a second distance larger than the above-described first distance. The first distance is less than a first threshold D 1 , and the second distance is equal to or larger than the first threshold D 1 . The first threshold D 1  is a threshold of a distance in the same manner as in Embodiment 1. 
     The first control in the present embodiment is different from the first controls in Embodiment 1 and Embodiment 2. Similarly, the second control in the present embodiment is different from the second controls in Embodiment 1 and Embodiment 2. Specifically, the air conditioner body  1  blows air toward the human body detected by the surface temperature sensor  3  which is an example of the human body detector, when the first control is executed. That is, the air is blown from the air conditioner body  1  toward the human body separated from the air conditioner body  1  by less than the first threshold D 1 . 
     On the other hand, both of the air conditioner body  1  and the air conditioner body  1   a  blow air toward the human body detected by the surface temperature sensor  3 , when the second control is executed. According to the present embodiment, the air is sent from another air conditioner body  1   a  to a worker far away from the air conditioner body  1 , which makes it possible to direct an airflow of a sufficient strength to the worker. Note that the air outlets  20  that do not face a direction from the air conditioner body  1  toward a worker may be closed as illustrated in  FIG.  12   , in the same manner as in Embodiment 1 and Embodiment 2. 
     The air conditioner body  1   a  has the same configuration as that of the air conditioner body  1 , as an example. At this time, in the air conditioner body  1   a , a third threshold D 3  may be set in the same manner as in the first variant illustrated in  FIG.  8    in Embodiment 1. At this time, the controller section  6  and the control circuit substrate  11  may execute the above-described second control when a distance from a human body to the air conditioner body  1  is equal to or larger than the first threshold D 1  and a distance from the human body to the air conditioner body  1   a  is equal to or larger than the third threshold D 3 . According to this example, the airflow of a sufficient strength can be directed toward a worker positioned far away from both of the air conditioner body  1  and the air conditioner body  1   a.    
     Embodiment 4 
     Next, Embodiment 4 will be described. As for the same or equivalent components as or to those in each embodiment as described above, the description is simplified or omitted. Hereinafter, the description will be made mainly focusing on differences from each embodiment as described above. 
       FIG.  13    is a diagram illustrating an operation of an environmental control system of Embodiment 4. The environmental control system according to the present embodiment includes an air conditioner body  1  and an air conditioner body  1   a  in the same manner as in Embodiment 3. The air conditioner body  1  and the air conditioner body  1   a  execute a work efficiency improvement operation for blowing air toward a human body. The air conditioner body  1  which is an example of the first air conditioner body may include one air outlet. Similarly, the air conditioner body  1   a  which is an example of the second air conditioner body may also include one air outlet. 
     The air conditioner body  1  is configured to allow air to be blown toward a first area. The air conditioner body  1  is provided to blow air to a worker in the first area. The air conditioner body  1   a  is configured to allow air to be blown toward a second area different from the first area. The air conditioner body  1   a  is provided to blow air to a worker in the second area. 
     In the present embodiment, a surface temperature sensor  3  which is an example of the human body detector can detect human bodies that are present in the first area and the second area. A controller section  6  is configured to determine the number of human bodies in the first area and the number of human bodies in the second area, the human bodies being detected by the surface temperature sensor  3 . The determination function is provided in a human position determination unit, for example. The controller section  6  and a control circuit substrate  11  that constitute an example of the system controller control the air conditioner body  1  and the air conditioner body  1   a  according to the number of human bodies in the first area and the number of human bodies in the second area. 
     Specifically, the controller section  6  and a control circuit substrate  11  cause the air conditioner body  1  and the air conditioner body  1   a  to blow air toward the human bodies in the first area when the number of human bodies in the first area is equal to or larger than a reference value and the number of human bodies in the second area is less than a reference value. Note that the above-described two reference values may be equal to or different from each other. According to the present embodiment, the strong airflow can be provided to a space in which many workers are present. 
     INDUSTRIAL APPLICABILITY 
     The environmental control system according to the present disclosure can be used to improve the work efficiency of a worker in a work space such as an office in which an air conditioner is provided, for example. 
     REFERENCE SIGNS LIST 
     
         
           1  Air conditioner body 
           1   a  Air conditioner body 
           2  Up-and-down louver 
           3  Surface temperature sensor 
           3   a  Temperature sensor 
           4  Left-and-right louver 
           5  Air inlet 
           6  Controller section 
           7  Information obtaining unit 
           8  Human position determination unit 
           9  Room temperature determination unit 
           11  Control circuit substrate 
           12  Information processing unit 
           13  Controller 
           14  Airflow direction controller 
           15  Air volume controller 
           16  Air outlet opening and closing controller 
           17  Airflow direction adjusting unit 
           18  Air volume adjusting unit 
           19  Air outlet opening and closing unit 
           20  Air outlet 
           21  Heat exchanger 
           22  Fan 
           30  Housing 
           31  Lower panel 
           40  Dedicated hardware 
           41  Processor 
           42  Memory