Abstract:
An air conditioner unit includes an air conditioner body, a first outgoing chamber, an outgoing connection section, an outgoing communication member, an outgoing port, and an outgoing port member. Through the first outgoing chamber, adjusted air flowing in from the air conditioner body is supplied to a target room. Through the outgoing connection section, the first outgoing chamber communicates with a second outgoing chamber of an adjacent air conditioner unit. The outgoing connection section is connected to the first outgoing chamber. The outgoing communication member is configured to open and close the outgoing connection section. Through the outgoing port, the adjusted air is supplied from the first outgoing chamber to the target room. The outgoing port member is configured to open and close the outgoing port.

Description:
CROSS-REFERENCE TO RELATED APPLICATION 
       [0001]    This application is based upon and claims the benefit of priority of the prior Japanese Patent Application No. 2014-082199 filed on Apr. 11, 2014, the entire contents of which are incorporated herein by reference. 
       FIELD 
       [0002]    The embodiments discussed herein are related to an air conditioner unit, an air conditioning system, and an air conditioning control method. 
       BACKGROUND 
       [0003]    There is an air conditioning system that processes an outlet air of a cold water coil by a package air conditioner, blows out the air into an underfloor chamber, and blows out the air from an air outlet to a rack equipped with a communication apparatus. 
         [0004]    A related technique is disclosed in, for example, Japanese Laid-open Patent Publication No. 2002-168479. 
         [0005]    In an air conditioning system, a plurality of air conditioner units exhibit supply capacity of desirable adjusted air and, in addition, the air conditioning system may be redundant by preparing a spare air conditioner in advance. 
         [0006]    However, if the spare air conditioner is provided in each of the plurality of air conditioner units, the number of spare air conditioners is excessive. 
       SUMMARY 
       [0007]    According to an aspect of the present invention, provided is an air conditioner unit including an air conditioner body, a first outgoing chamber, an outgoing connection section, an outgoing communication member, an outgoing port, and an outgoing port member. Through the first outgoing chamber, adjusted air flowing in from the air conditioner body is supplied to a target room. Through the outgoing connection section, the first outgoing chamber communicates with a second outgoing chamber of an adjacent air conditioner unit. The outgoing connection section is connected to the first outgoing chamber. The outgoing communication member is configured to open and close the outgoing connection section. Through the outgoing port, the adjusted air is supplied from the first outgoing chamber to the target room. The outgoing port member is configured to open and close the outgoing port. 
         [0008]    The object and advantages of the invention will be realized and attained by means of the elements and combinations particularly pointed out in the claims. 
         [0009]    It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are not restrictive of the invention, as claimed. 
     
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
         [0010]      FIG. 1  is a perspective view illustrating an air conditioning system of a first embodiment; 
           [0011]      FIG. 2  is a perspective view illustrating an air conditioner unit; 
           [0012]      FIG. 3  is a front view illustrating a connection state of air conditioner units; 
           [0013]      FIG. 4  is a block diagram illustrating the air conditioning system of the first embodiment; 
           [0014]      FIG. 5  is a plan view illustrating the air conditioning system of the first embodiment; 
           [0015]      FIG. 6  is a flowchart illustrating an example of a control flow of the air conditioning system of the first embodiment; 
           [0016]      FIG. 7  is a plan view illustrating the air conditioning system of the first embodiment; 
           [0017]      FIG. 8  is a plan view illustrating an air conditioning system of a first comparative example; 
           [0018]      FIG. 9  is a flowchart illustrating an example of a control flow of the air conditioning system of the first embodiment; 
           [0019]      FIG. 10  is a plan view illustrating the air conditioning system of the first embodiment; 
           [0020]      FIG. 11  is a plan view illustrating the air conditioning system of the first embodiment; 
           [0021]      FIG. 12  is a plan view illustrating the air conditioning system of the first embodiment; 
           [0022]      FIG. 13  is a plan view illustrating the air conditioning system of the first embodiment; 
           [0023]      FIG. 14  is a plan view illustrating an air conditioning system of a second embodiment; 
           [0024]      FIG. 15  is a plan view illustrating an air conditioning system of a third embodiment; 
           [0025]      FIG. 16  is a plan view illustrating an air conditioning system of a fourth embodiment; 
           [0026]      FIG. 17  is a plan view illustrating the air conditioning system of the fourth embodiment; and 
           [0027]      FIG. 18  is a plan view illustrating an air conditioning system of a second comparative example. 
       
    
    
     DESCRIPTION OF EMBODIMENTS 
       [0028]    A first embodiment will be described in detail with reference to the drawings. 
         [0029]      FIG. 1  illustrates an air conditioning system  12  including air conditioner units  14  of the first embodiment.  FIG. 2  illustrates one of the air conditioner units  14 . The air conditioning system  12  includes a plurality of air conditioner units  14 . 
         [0030]    The air conditioning system  12  of the first embodiment sends adjusted air, for example, from an underfloor chamber  16  to a server room  18  and cools a plurality of servers  22  disposed in the server room  18 . The server room  18  is an example of an air conditioning target room. A structure including a plurality of server rooms  18  as illustrated in  FIG. 5  and the like includes a data center and the like. 
         [0031]    Air of the server room  18  returns through a ceiling chamber  20  to the air conditioner units  14 . In the first embodiment, the underfloor chamber  16 , the server room  18 , and the ceiling chamber  20  are integrated as a server module. In the first embodiment, as illustrated in  FIG. 3 , three air conditioner units  14  correspond to one server module. 
         [0032]    As illustrated in  FIG. 2  in detail, an air conditioner unit  14  includes an air conditioner body  24 . The air conditioner body  24  adjusts flow-in air and makes the air flow out. In the present embodiment, the air conditioner body  24  includes a cooling device  26  therein. The air conditioner body  24  cools the flow-in air with the cooling device  26 . As illustrated in  FIG. 4 , driving of the air conditioner body  24  is controlled by a control device  28 . 
         [0033]    The air conditioner unit  14  includes an air supply chamber  30  and a return air chamber  32 . Each of the air supply chamber  30  and the return air chamber  32  is connected to the air conditioner body  24  by a duct  34 . 
         [0034]    The air supply chamber  30  includes an air supply port  36  connected to the underfloor chamber  16 . The air supply port  36  is provided with an air supply port opening and closing member  38  that is controlled to be opened or closed by the control device  28 . The return air chamber  32  includes a return air port  40  connected to the ceiling chamber  20 . The return air port  40  is provided with a return air port opening and closing member  42  that is controlled to be opened or closed by the control device  28 . 
         [0035]    If the air conditioner body  24  is driven in a state where the air supply port opening and closing member  38  and the return air port opening and closing member  42  are opened, as illustrated by arrows F 1  in  FIG. 1 , the adjusted air flows from the air supply chamber  30  to the server room  18  through the underfloor chamber  16 . Then, as illustrated by arrows F 2  in  FIG. 1 , the air of the server room  18  flows to the air conditioner body  24  through the ceiling chamber  20  and the return air chamber  32 . That is, a circulation path  44  in which the air returns from the air supply chamber  30  to the return air chamber  32  through the server room  18  is formed. 
         [0036]    If at least one of the air supply port opening and closing member  38  and the return air port opening and closing member  42  is closed, the circulation path  44  is also closed and the flow of the air illustrated by the arrows F 1  and F 2  may be inhibited. That is, the air supply port opening and closing member  38  and the return air port opening and closing member  42  may be said to be examples of a circulation path opening and closing member. 
         [0037]    As illustrated by arrows F 3  in  FIG. 3 , the air that is returned to the return air chamber  32  flows from the return air chamber  32  to the air supply chamber  30  through the air conditioner body  24 . The duct  34  is provided with a backflow suppression member  46  that suppresses the flow (backflow) of the air in a reverse direction of the arrows F 3 . As the backflow suppression member  46 , for example, a check valve may be used. 
         [0038]    As illustrated in  FIGS. 2 and 3 , both the air supply chamber  30  and the return air chamber  32  are rectangular tubular members and disposed in such a manner that a longitudinal direction (arrow direction L 2  in  FIGS. 2 and 3 ) is a lateral direction. The lateral direction coincides with an arrangement direction (arrow direction L 1  in  FIG. 1 ) of the plurality of air conditioner units  14 . Furthermore, a length L 3  of the air supply chamber  30  is equal to a length L 4  of the return air chamber  32 . 
         [0039]    Air supply side connection sections  48  are provided on one end side and the other end side of the air supply chamber  30  in the longitudinal direction. As illustrated in  FIG. 2 , an air supply side opening and closing member  50  is provided in each of the air supply side connection sections  48 . As illustrated in  FIG. 4 , the air supply side opening and closing member  50  is controlled to be opened or closed by the control device  28 . 
         [0040]    Return air side connection sections  52  are provided on one end side and the other end side of the return air chamber  32  in the longitudinal direction. As illustrated in  FIG. 2 , a return air side opening and closing member  54  is provided in each of the return air side connection sections  52 . As illustrated in  FIG. 4 , the return air side opening and closing member  54  is controlled to be opened or closed by the control device  28 . 
         [0041]    As illustrated in  FIGS. 1 and 5 , in the air conditioning system  12 , the plurality of air conditioner units  14  are arranged in the same direction as the longitudinal direction of the air supply chamber  30 . The air supply chambers  30  of the air conditioner units  14  are connected at the air supply side connection sections  48  and the return air chamber  32  is connected at the return air side connection sections  52 . 
         [0042]    As illustrated in  FIG. 5 , in the first embodiment, a plurality (this represents a natural number N; N=3 in  FIG. 5 ) of air conditioner units  14  are provided with respect to one server room  18  (air conditioning target room). 
         [0043]    Furthermore, as illustrated in  FIG. 5 , in the first embodiment, a spare machine unit  62  is provided at an end in the arrangement direction of the air conditioner units  14 . As illustrated in  FIGS. 4 and 5 , the spare machine unit  62  includes an air conditioning spare machine body  64 , the air supply chamber  30 , and the return air chamber  32 . The air supply chamber  30  of the spare machine unit  62  is an example of an air supply spare chamber and the return air chamber  32  is an example of a return air spare chamber. 
         [0044]    The air supply chamber  30  of the spare machine unit  62  is connected to the air supply chamber  30  of an adjacent air conditioner unit  14  by an air supply side connection section  48 . Similarity, the return air chamber  32  of the spare machine unit  62  is connected to the return air chamber  32  of the adjacent air conditioner unit  14  by a return air side connection section  52 . 
         [0045]    However, the spare machine unit  62  itself does not correspond to a particular server room  18  (air conditioning target room) and the air supply port  36  and the return air port  40  of the spare machine unit  62  remain closed. 
         [0046]    As described above, the spare machine unit  62  may employ the same structure as that of the air conditioner unit  14  except that the air supply port  36  and the return air port  40  are not connected to the server room  18 . Thus, the air conditioner unit  14  may be used as the spare machine unit  62 . Instead of this, for example, a structure in which the air supply port  36  and the return air port  40  are omitted in the air conditioner unit  14  may be provided as a new spare machine unit  62 . 
         [0047]    According to the first embodiment, since such an air conditioning spare machine body  64  is provided, redundancy is achieved in the air conditioning system  12 , as an ability to send the adjusted air, by the number (one in  FIG. 5 ) of the air conditioning spare machine bodies  64 . 
         [0048]    The control device  28  grasps a relationship between each load and power consumption of the air conditioner body  24  on the basis of a built-in database or the like. As illustrated in  FIG. 5 , in the first embodiment, the control device  28  grasps, for each server room  18 , a plurality of air conditioner units  14  that cool the server room  18  as a unit set  14 G. The control device  28  grasps the load of each server room  18  by power measurement or the like. Furthermore, the control device  28  grasps a driving state of the air conditioner body  24  and the air conditioning spare machine body  64 , and an opening and closing state of the air supply port opening and closing member  38 , the return air port opening and closing member  42 , the air supply side opening and closing member  50 , and the return air side opening and closing member  54 . 
         [0049]    Next, an operation and an air conditioning control method of the first embodiment will be described. 
         [0050]    As illustrated in  FIGS. 1 ,  3 , and  5 , the air conditioning system  12  of the first embodiment includes the plurality of air conditioner units  14 . 
         [0051]      FIG. 5  illustrates a state where all air conditioner bodies  24  of the plurality of air conditioner units  14  are driven. At this time, driving of the air conditioning spare machine body  64  is stopped. In the drawings, “x” is given to the air conditioner body  24  and the air conditioning spare machine body  64  of which driving are stopped. 
         [0052]    The air supply side opening and closing member  50  and the return air side opening and closing member  54  positioned at a boundary of the server room  18  are closed. Furthermore, the air supply side opening and closing member  50  and the return air side opening and closing member  54  between the air conditioner unit  14  and the spare machine unit  62  are also closed. In the drawings, “x” is given to the air supply side connection section  48  and the return air side connection section  52  which are closed. 
         [0053]    Thus, for each of the plurality of server rooms  18 , the adjusted air is sent from N (N=3 in  FIG. 5 ) air conditioner bodies  24 . Then, the air is returned from each server room  18  to the same N air conditioner bodies  24 . The control device  28  grasps the load of each air conditioner body  24 , the air conditioning spare machine body  64 , and each server room  18 . 
         [0054]      FIG. 6  illustrates an example of a flowchart of an air conditioning control method in the air conditioning system  12  of the first embodiment. According to this control flow, even when one of the air conditioner bodies  24  is stopped, it is possible to send the adjusted air from N air conditioner bodies  24  to each server room  18  by driving the air conditioning spare machine body  64  that has been stopped. 
         [0055]    In the control flow, first, in S 12 , presence or absence of an air conditioner body  24  that is stopped is determined. If it is determined that the air conditioner body  24  that is stopped is absent, the control flow is finished. A cause of stoppage of the air conditioner body  24  is not specifically limited and, for example, stoppage for inspection is also included in addition to the stoppage due to failure. 
         [0056]    If it is determined that an air conditioner body  24  (air conditioner body  24 N in  FIG. 7 ) that is stopped is present, the air conditioning spare machine body  64  is driven in S 14 . Then, the air supply chamber  30  (air supply spare chamber) of the spare machine unit  62  is caused to communicate with the air supply chamber  30  of the adjacent air conditioner unit  14  and the return air chamber  32  (return air spare chamber) of the spare machine unit  62  is caused to communicate with the return air chamber  32  of the adjacent air conditioner unit  14 . 
         [0057]    In S 16 , the opening and closing states of the air supply side opening and closing member  50  and the return air side opening and closing member  54  are changed and communication positions between the air supply chambers  30  and communication positions between the return air chambers  32  are changed. Specifically, as illustrated in  FIG. 7 , the communication positions are changed so that the air conditioner units  14  sending the adjusted air to each server room  18  are shifted, between the air conditioner body  24 N that is stopped and the air conditioning spare machine body  64 , by one towards the air conditioning spare machine body  64  side. 
         [0058]    In S 18 , the air supply port opening and closing member  38  and the return air port opening and closing member  42  of the air conditioner unit  14  in which the destination of adjusted air is changed are closed. In the example illustrated in  FIG. 7 , for example, the air supply port opening and closing member  38  and the return air port opening and closing member  42  of the air conditioner unit  14 M are closed. In the drawings, “x” is given to the air supply port opening and closing member  38  and the return air port opening and closing member  42  which are closed. 
         [0059]    Thus, even if one of the air conditioner bodies  24  is stopped, it is possible to send the adjusted air from N air conditioner bodies  24  (including the air conditioning spare machine body  64 ) to each server room  18 . 
         [0060]    In the control flow illustrated in  FIG. 6 , the order of S 14 , S 16 , and S 18  may be different from that in the above description and any or all of the processes may be performed concurrently. 
         [0061]      FIG. 8  illustrates an air conditioning system  112  of a first comparative example. 
         [0062]    In the air conditioning system  112  of the first comparative example, N (N=3 in  FIG. 8 ) air conditioner bodies  24  are provided in each server room  18  and one air conditioning spare machine body  64  is provided in each server room  18 . 
         [0063]    Thus, the number of the air conditioning spare machine bodies  64  that are provided in the air conditioning system  112  of the first comparative example is the same as the number of the server rooms  18 . 
         [0064]    In the air conditioning system  12  of the first embodiment, in a case where one air conditioner body  24  is stopped, it is possible to ensure redundancy without providing the air conditioning spare machine body  64  in each server room  18 . Since one air conditioning spare machine body  64  may ensure redundancy, it is possible to reduce the number of the air conditioning spare machine bodies  64  compared to the air conditioning system  112  of the first comparative example. The reduction of the number of the air conditioning spare machine bodies  64  allows reduction of the cost and conservation of the space (narrowing an installation space) of the air conditioning system  12 . 
         [0065]    The air conditioning system  12  of the first embodiment includes the air conditioning spare machine body  64 . Since the air conditioning spare machine body  64  includes the air supply chamber  30  (air supply spare chamber), it is possible to easily and reliably be connected to the air supply chamber  30  of the adjacent air conditioner body  24 . Furthermore, since the air conditioning spare machine body  64  includes the return air chamber  32  (return air spare chamber), it is possible to easily and reliably be connected to the return air chamber  32  of the adjacent air conditioner body  24 . 
         [0066]    In the air conditioning system  12  of the first embodiment, if a desirable amount of the adjusted air of each server room  18  is changed, it is possible to adjust a sending amount of the adjusted air to the server room  18  by a control flow of the air conditioning control method illustrated in  FIG. 9 . 
         [0067]    In a control flow illustrated in  FIG. 9 , in S 22 , presence or absence of a server room  18  in which the desirable amount of the adjusted air is reduced is determined. If it is determined that there is a server room  18  (server room  18 A in  FIGS. 10 and 11 ) in which the desirable amount of the adjusted air is reduced, presence or absence of a server room  18  in which the desirable amount of the adjusted air is increased is determined in S 24 . 
         [0068]    If it is determined that the server room  18  in which the desirable amount of the adjusted air is increased is absent, an air conditioner body  24  of the air conditioner unit  14  which sends the adjusted air to a server room  18 A in which the desirable amount of the adjusted air is reduced is stopped in S 26 . Specifically, in the example illustrated in  FIG. 10 , the air conditioner body  24 A of an air conditioner unit  14 A is stopped. Then, the control flow is finished. 
         [0069]    In the example illustrated in  FIG. 10 , the number of the server rooms  18  in which the desirable amount of the adjusted air is reduced is one, however, the number of the server rooms  18  in which the desirable amount of the adjusted air is reduced may be two (or more) as illustrated  FIG. 12 . In this case, it is possible to stop air conditioner bodies  24  corresponding to the server rooms  18  in which the desirable amount of the adjusted air is reduced. It is possible to send the adjusted air from two air conditioner bodies  24  to a server room  18  in which the desirable amount of the adjusted air is increased. 
         [0070]    If it is determined that a server room  18  (server room  18 B illustrated in  FIG. 12 ) in which the desirable amount of the adjusted air is increased is present, in S 28 , the communication positions between the air supply chambers  30  and the communication positions between the return air chambers  32  are changed by changing the opening and closing states of the air supply side opening and closing members  50  and the return air side opening and closing members  54 . Specifically, the opening and closing states of specific air supply side opening and closing members  50  and specific return air side opening and closing members  54  are changed as illustrated in  FIG. 12  and thereby, the communication positions are changed so that the air conditioner units  14  sending the adjusted air to each server room  18  between the server room  18 A and the server room  18 B are shifted by one toward the server room  18 A side. 
         [0071]    In S 30 , the air supply port opening and closing members  38  and the return air port opening and closing members  42  of air conditioner units  14 B in which the destination of the adjusted air is changed are closed. Then, the control flow is finished. 
         [0072]    If it is determined in S 22  that the server room  18  in which the desirable amount of the adjusted air is reduced is absent, presence or absence of a server room  18  in which the desirable amount of the adjusted air is increased is determined in S 32 . 
         [0073]    If it is determined that the server room  18  in which the desirable amount of the adjusted air is increased is absent, the control flow is finished. 
         [0074]    If it is determined that a server room  18  (server room  18 B illustrated in  FIG. 13 ) in which the desirable amount of the adjusted air is increased is present, the air conditioning spare machine body  64  is driven in S 34 . 
         [0075]    Then in S 28 , the communication positions between the air supply chambers  30  and the communication positions between the return air chambers  32  are changed by changing the opening and closing states of the air supply side opening and closing members  50  and the return air side opening and closing members  54 . Specifically, the opening and closing states of specific air supply side opening and closing members  50  and specific return air side opening and closing members  54  are changed as illustrated in  FIG. 13  and thereby, the communication positions are changed so that the air conditioner units  14  sending the adjusted air to each server room  18  between an air conditioner body  24 C corresponding to the server room  18 B and the air conditioning spare machine body  64  are shifted by one towards the air conditioning spare machine body  64  side. 
         [0076]    In S 30 , the air supply port opening and closing members  38  and the return air port opening and closing members  42  of the air conditioner units  14  in which the destination of the adjusted air is changed are closed. 
         [0077]    Thus, according to the present embodiment, if the desirable amount of the adjusted air of each server room  18  is changed, the communication states between the air supply chambers  30  and the communication states between the return air chambers  32  are changed depending on the change of the desirable amount of the adjusted air, and it is possible to send the adjusted air of an appropriate amount to each server room  18 . 
         [0078]    In the first embodiment, each air conditioner unit  14  includes the air supply side connection section  48  and the return air side connection section  52 . The air supply side connection section  48  may be opened and closed by the air supply side opening and closing member  50  and the return air side connection section  52  may be opened and closed by the return air side opening and closing member  54 . By arranging a plurality of air conditioner units  14  in a line, it is possible to realize an air conditioning system  12  in which the air supply chambers  30  are connected to each other, the return air chambers  32  are connected to each other, and the air supply side connection sections  48  and the return air side connection sections  52  are controlled to be opened and closed. 
         [0079]    Two air supply side connection sections  48  are included in one air supply chamber  30  and two return air side connection sections  52  are included in one return air chamber  32 . Thus, in the air conditioning system  12  in which three or more air conditioner units are arranged, it is possible to apply the air conditioner unit  14  midway (other than both ends) in the arrangement direction. In other words, it is possible to realize an air conditioning system in which three or more air conditioner units are arranged by using the air conditioner units  14 . 
         [0080]    The two air supply side connection sections  48  are respectively provided on one end side and the other end side of one air supply chamber  30 . The two return air side connection sections  52  are respectively provided on one end side and the other end side of one return air chamber  32 . Thus, as illustrated in  FIG. 5 , it is possible to realize an air conditioning system  12  having a structure in which a plurality of air conditioner units  14  are linearly arranged. 
         [0081]    Since the air supply chamber  30  and the return air chamber  32  have the same length as each other, when the plurality of air conditioner units  14  are arranged, no gap is formed anywhere between the air supply chambers  30  and between the return air chambers  32 . That is, it is possible to connect the air supply chambers  30  to each other and the return air chambers  32  to each other without using additional connection members to fill a gap. 
         [0082]    Since each air conditioner unit  14  includes the air supply port opening and closing member  38  and the return air port opening and closing member  42 , it is possible to easily switch the opening and closing state of the circulation path  44 . The air supply port opening and closing member  38  and the return air port opening and closing member  42  are examples of the circulation path opening and closing member and either one may switch the opening and closing state of the circulation path  44 . 
         [0083]    Since the air supply port opening and closing member  38  is provided in the air supply port  36  and the return air port opening and closing member  42  is provided in the return air port  40 , which are examples of the circulation path opening and closing member, it is possible to switch the opening and closing state of the circulation path without changing the structure of the server room  18 . 
         [0084]    Particularly, it is possible to effectively suppress the outflow of the adjusted air from the air supply chamber  30  to the air conditioning target room (the server room  18 ) and it is possible to suppress the circulation of the air through the circulation path  44  by providing the air supply port opening and closing member  38 . 
         [0085]    The air conditioner unit  14  includes the backflow suppression member  46 . Thus, for example, it is possible to suppress the flow of the air from the air supply chamber  30  to the return air chamber  32  through the air conditioner body  24 , that is, backflow of gas. 
         [0086]    Since the air conditioner body  24  includes the cooling device  26 , it is possible to send cooled air as the adjusted air to the server room  18  and to effectively cool the servers  22 . 
         [0087]    Next, a second embodiment will be described. In the second embodiment, similar reference numerals are given to similar elements, members, and the like as those of the first embodiment, and a detailed description will be omitted. 
         [0088]    In the first embodiment described above, the spare machine unit  62  is provided at an end in the arrangement direction of the air conditioner units  14 , but in an air conditioning system  72  of the second embodiment, the spare machine unit  62  is provided midway in the arrangement direction of the air conditioner unit  14  as illustrated in  FIG. 14 . The air supply chamber  30  and the return air chamber  32  of the spare machine unit  62  are respectively connected to the air supply chambers  30  and the return air chambers  32  of the adjacent air conditioner units  14  on both sides by the air supply side connection sections  48  and the return air side connection sections  52 . 
         [0089]    As described above, the position of the spare machine unit  62  is not limited. Furthermore, the spare machine units  62  may be disposed at an end and midway in the arrangement direction of the air conditioner units  14 . 
         [0090]    Next, a third embodiment will be described. In the third embodiment, similar reference numerals are given to similar elements, members, and the like as those of the first and second embodiments, and a detailed description will be omitted. 
         [0091]    As illustrated in  FIG. 15 , in an air conditioning system  82  of the third embodiment, the number of air conditioner units  14  sending the adjusted air to a specific server room  18 D is great. Specifically, one air conditioner unit  14 D is added in the arrangement direction of the air conditioner units  14  and one air conditioner unit  14 E is added in a direction orthogonal to the arrangement direction of the air conditioner units  14 . Further, the spare machine unit  62  is connected to the air conditioner unit  14 E. 
         [0092]    Compared to the first and second embodiment, it is possible to increase supply capacity of the adjusted air with respect to the specific server room  18 D in the third embodiment. 
         [0093]    Next, a fourth embodiment will be described. In the fourth embodiment, similar reference numerals are given to similar elements, members, and the like as those of the first to third embodiments, and a detailed description will be omitted. 
         [0094]    As illustrated in  FIG. 16 , in the fourth embodiment, a server room is large compared to the first to third embodiments and one air conditioning system  92  corresponds to one server room  98 . The adjusted air is sent to a server set  22 G (the number of sets is referred to as K; K=5 in  FIG. 16 ) of servers  22  from each of N (N is a natural number; N=4 in  FIG. 16 ) air conditioner units  14 . As a whole, N×K air conditioner units  14  and at least one (one in  FIG. 16 ) spare machine unit  62  are provided in the air conditioning system  92 . 
         [0095]    In the fourth embodiment, in a state where all air conditioner bodies  24  of the plurality of air conditioner units  14  are driven and the spare machine unit  62  is stopped, the adjusted air is sent from N (K×N in total) air conditioner bodies  24  to each of K server sets  22 G. The air is returned from the server room  98  to the air conditioner bodies  24 . 
         [0096]    In the fourth embodiment, when one of the air conditioner bodies  24  is stopped, for example, control similar to the control flow illustrated in  FIG. 6  is performed and thereby, it is possible to send the adjusted air from N air conditioner bodies  24  to each server set  22 G as illustrated in  FIG. 17 . 
         [0097]    In the fourth embodiment, if a desirable amount of the adjusted air of each server set  22 G is changed, it is possible to adjust a sending amount of the adjusted air to the server set  22 G by the control flow of the air conditioning control method illustrated in  FIG. 9 . 
         [0098]    In the fourth embodiment, it is possible to employ the structure in which the spare machine unit  62  is disposed midway in the arrangement direction of the air conditioner unit  14  as in the second embodiment. 
         [0099]      FIG. 18  illustrates an air conditioning system  122  of a second comparative example. In the second comparative example, a plurality of air conditioner bodies  24  and one air conditioning spare machine body  64  are provided for each of a plurality of server sets  22 G in a server room  18 . That is, the air conditioning system  122  of the second comparative example includes the same number of the air conditioning spare machine bodies  64  as that of the server sets  22 G. 
         [0100]    According to the air conditioning system  92  of the fourth embodiment, it is possible to reduce the number of the air conditioning spare machine bodies  64  compared to the air conditioning system  122  of the second comparative example. 
         [0101]    In each embodiment described above, it is assumed that an air amount (ability to supply the adjusted air) of each air conditioner body  24  and the air conditioning spare machine body  64  is stable, but the air amount of the air conditioner body  24  may be variable. 
         [0102]    If the air amount of the air conditioner body  24  is variable, when assigning the same number of the air conditioner bodies  24  to each server room  18 , there may be a server room  18  in which the load for each air conditioner body  24  becomes the minimum and a server room  18  in which the load becomes the maximum. The control device  28  may calculate the loads of an entire air conditioning system  12  in a case where air conditioner bodies  24  of the same number are assigned to each server room  18 . Furthermore, the control device  28  may calculate the loads of the entire air conditioning system  12  in a case where the number of the air conditioner bodies  24  assigned to a server room  18  in which the load of the air conditioner bodies  24  becomes the minimum is decreased and the number of the air conditioner bodies  24  assigned to a server room  18  in which the load becomes the maximum is increased. Then, it is possible to change the air amount of the air conditioner bodies  24  or a corresponding relationship between a server room  18  and air conditioner units  14  so as to set the load to be the lower of the calculated two loads. 
         [0103]    In each embodiment described above, since the air conditioner body  24  and the air conditioning spare machine body  64  include the cooling device  26 , it is possible to reliably (forcedly) cool the air by the air conditioner body  24  and the air conditioning spare machine body  64 . 
         [0104]    All examples and conditional language recited herein are intended for pedagogical purposes to aid the reader in understanding the invention and the concepts contributed by the inventor to furthering the art, and are to be construed as being without limitation to such specifically recited examples and conditions, nor does the organization of such examples in the specification relate to a showing of superiority or inferiority of the invention. Although the embodiments of the present invention have been described in detail, it should be understood that various changes, substitutions, and alterations could be made hereto without departing from the spirit and scope of the invention.