JP5855895B2 - Air conditioning systems for communication / information processing equipment rooms, etc. - Google Patents

Description

  The present invention relates to an air conditioning system for a communication / information processing electronic device room, and more particularly to a communication / information processing electronic device in which a plurality of electronic devices with high heat generation density such as communication / information processing electronic devices are arranged. The present invention relates to an air conditioning system such as an equipment room.

  In an electronic equipment room of a facility where a large number of computers for communication and information processing (hereinafter referred to as “electronic equipment”) are installed, such as a laboratory computer room and a data center, the room temperature is reduced by the heat released from the electronic equipment. The electronic equipment may go out of control or break down due to the heat rising to a high temperature. For this reason, in general, an air conditioning system that maintains a constant temperature of the entire room is employed in the electronic equipment room (Patent Document 1).

  10 and 11 show an example of a conventional server room air conditioning system known from Patent Document 1 and the like. In the figure, a conventional air conditioning system for an electronic equipment room includes a plurality of racks 53, 53... In which a plurality of electronic equipments 52, 52, 52, 52 are stacked in a vertical direction in an electronic equipment room 51. A plurality of rows of racks 54 arranged side by side, and a plurality of air conditioners 55, 55... For keeping the temperature of the entire electronic equipment room 51 constant in the electronic equipment room 51 are also provided on the floor. is set up.

  As shown in FIG. 11, the electronic equipment room 51 is provided with an air circulation space 58 as an air passage having an air intake 56 and an air exhaust 57 under the floor, and the air intake 59 and the air exhaust are provided on the ceiling. An air circulation space 61 having an outlet 60 is also provided as an air passage.

  In this air conditioning system, the cold air generated by each of the air conditioners 55, 55... Is blown into the electronic equipment room 51 from under the floor through the air intake 56, the air circulation space 58, and the air discharge 57 in order. The cold air flows into the electronic devices 52, 52, and cools the electronic devices 52, 52, and so on. On the other hand, the heated used air that is discharged through heat exchange in each electronic device 52, 52... Passes through the air intake 59 on the ceiling side, the air circulation space 61, and the air exhaust 60 in order. It is returned to the air conditioner 55, cooled, and sent out again to the electronic devices 52, 52. Therefore, the entire room is air-conditioned by this air circulation.

JP 2003-56882 A.

  However, in the conventional air conditioning system such as the communication / information processing electronic equipment room described above, the air conditioner is installed on the floor of the electronic equipment room. There was a problem of requiring a large installation space as a whole.

  In addition, since an air circulation space with an air intake port and an air discharge port is provided under the floor, when the rack layout is changed or expanded, the reach of cold air from the air conditioner and the air flow distribution are taken into consideration. Must be installed. For this reason, there existed a problem that it received restrictions with respect to installation, and the problem that air-conditioning efficiency worsened and consumed useless electric power energy.

  In addition, since the underfloor must have a double structure, there is a problem that the structure becomes complicated and the equipment cost increases.

  Therefore, it is possible to improve the air conditioning efficiency of the electronic equipment room to reduce the heat load of the electronic equipment, eliminate unnecessary power energy consumption, contribute to energy saving, and obtain a small and inexpensive air conditioning system. Therefore, a technical problem to be solved arises, and the present invention aims to solve this problem.

The present invention has been proposed in order to achieve the above object, and the invention according to claim 1 is characterized in that racks in which communication / information processing devices are mounted in the vertical direction are aligned to form a rack row, A system for air-conditioning a plurality of installed equipment rooms, wherein cold air is blown out toward the suction surface of the rack, the cold air is circulated into the rack, and flows from the upstream side to the downstream side, and the communication / A high sensible heat type indoor unit for sucking used air discharged from the downstream side after cooling of the information processing equipment, generating cooling air that is cooled and blown again toward the suction surface of the rack A ceiling-mounted multi-air conditioner in which a plurality of units are suspended from a ceiling of a room and the plurality of indoor units are connected to a smaller number of outdoor units than the number of the indoor units, and driving of the air conditioner Control The controller and the provided, the indoor units which, while being arranged adjacent, heat exchanger is placed in a box-shaped housing formed plan view a square shape, the heat exchanger is a side surface of said equipment chamber Each of the four heat exchangers is provided on each of the four facing sides so as to suck the used cold air from the side toward the center, and the heat exchanger surfaces of the indoor units are not directly opposed to each other. Provided is an air conditioning system such as a communication / information processing equipment room provided by rotating a predetermined angle of view .

According to this configuration, since the indoor units of the air conditioner are installed on the ceiling of the equipment room, a plurality of units can be provided at predetermined positions without significantly affecting the space on the floor surface side. In addition, cool air is blown out from each indoor unit toward the suction surface of the rack, and the air is passed through the rack to cool the communication / information processing equipment. The machine sucks the air, cools the air, and blows out again toward the suction surface of the rack, so that the air can be cooled only in the equipment room. Therefore, the air conditioning process can be performed without making the floor surface or ceiling a double structure. In addition, each indoor unit is rotated by a predetermined angle in plan view, and each indoor unit is installed so that the side surfaces of the indoor units do not face each other, thereby increasing the amount of air consumed by each indoor unit. And return of used air can be made smooth.

  According to a second aspect of the present invention, in the configuration according to the first aspect, the controller causes the indoor unit to discharge the amount of cool air blown toward the suction surface of the rack from the downstream side through the rack. An air conditioning system for a communication / information processing equipment room or the like that controls each indoor unit so as to be larger than the amount of used air discharged.

  According to this configuration, by setting the air volume of the cool air that is blown out toward the suction surface of the rack by each indoor unit larger than the amount of used air discharged from the downstream side through the inside of the rack, Since the (upstream side) is high pressure and the suction side is low pressure, the cold air blown out from each indoor unit bypasses the inside of the rack and returns to the indoor unit side, or used air does not return to the suction side It is possible to prevent return to the blowout side by bypassing.

  According to a third aspect of the present invention, in the configuration of the first or second aspect, each indoor unit provides an air conditioning system such as a communication / information processing equipment room that can be switched to a dehumidifying operation when dehumidifying is required. .

  According to this configuration, the dehumidifying operation can be performed not only by the high sensible heat treatment but also by switching the mode when dehumidifying is necessary, for example, when starting up the air conditioning.

According to a fourth aspect of the present invention, there is provided the communication / information processing apparatus according to the fourth aspect, wherein the box-shaped casing is provided with a cold air outlet for blowing out the cold air on an inclined panel surface facing the suction surface of the rack. Provide air conditioning systems for rooms, etc.

  According to this configuration, the cool air is smoothly blown out from the outlet of the inclined panel surface of each indoor unit toward the suction surface of the rack, and the circulation of the cool air can be made smooth.

According to a fifth aspect of the invention, according to claim 1, in the configuration of 3 or 4, wherein said controller is individually capacity controllable said each indoor unit to variations in the calorific value distribution chamber the instrument An air conditioning system such as a communication / information processing equipment room is provided.

  According to this configuration, it is possible to finely adjust the temperature in the equipment room by individually controlling the capacity of each indoor unit with respect to fluctuations in the calorific value distribution in the equipment room.

According to a sixth aspect of the invention, claim 1, 2, 3, in the configuration of the 5 described was 4 or, the controller may individually feeding each of the above indoor unit for variations in the calorific value distribution chamber the instrument Provided is an air conditioning system such as a communication / information processing equipment room configured to be capable of controlling air flow.

  According to this configuration, the temperature in the equipment room can be more finely adjusted by individually controlling the amount of air blown by each indoor unit with respect to fluctuations in the heat generation amount distribution in the equipment room.

According to a seventh aspect of the present invention, in the configuration according to the sixth aspect, the controller detects the temperature of the cool air blown toward the suction surface of the rack and the temperature of the upper sneak current into the rack, respectively. An air conditioning system such as a communication / information processing equipment room that individually controls the air flow rate of each indoor unit is provided.

  According to this configuration, by controlling the amount of air blown by each indoor unit individually with respect to fluctuations in the temperature of the cold air blown toward the suction surface of the rack in the equipment room and the temperature of the sneak current into the rack, the equipment The room temperature can be adjusted more finely.

Invention according to claim 8, claim 1,2,3,4,5, in the configuration of the 6 or 7, wherein the chamber is provided in the ceiling of the room above equipment rack from the blowing port provided on the ceiling surface Cool air is blown out toward the suction surface, air returning from the room is sucked into the indoor units through the ceiling chamber through a suction port provided on the ceiling surface, and the ceiling chamber is returned to the indoor units as a return chamber. Provide an air conditioning system such as a communication / information processing equipment room.

  According to this configuration, the used air in the equipment room can be smoothly returned to each indoor unit through the ceiling chamber.

The invention of claim 9, wherein, in the structure according to claim 8, each indoor unit provides a cassette of has been air-conditioning system such as a communication and information processing equipment chamber formed by removably attached to the chamber.

  According to this configuration, attachment and replacement can be freely performed by detaching each indoor unit from the chamber.

According to the first aspect of the present invention, since the indoor unit of the air conditioner is installed on the ceiling of the equipment room, a plurality of indoor units can be installed compactly in the equipment room. This can be expected to reduce the size of the equipment room. In addition, since the floor and ceiling surfaces do not have a double structure, the air can be cooled only in the equipment room, so there are fewer restrictions when installing indoor units and communication / information processing equipment. can do. Furthermore, simplification of the structure and reduction in equipment cost can be expected, and improvement in air conditioning efficiency can be expected. Moreover, since used cold air can be smoothly returned to each indoor unit, further improvement in air conditioning efficiency can be expected.

  According to the second aspect of the present invention, the cold air blown out from each indoor unit bypasses and returns to each indoor unit without passing through the rack, or the used air bypasses and blows out without returning to the suction side. Since it can prevent returning to the side, further improvement in air conditioning efficiency can be expected.

  Since the dehumidifying operation can be performed when dehumidification is required, such as when the air conditioner is started up, the environment of the entire equipment room can be maintained in a better state.

In the invention according to claim 4, since the cool air can be smoothly circulated from the outlet of the inclined panel surface of each indoor unit toward the rack suction surface, the air conditioning efficiency can be further improved. .

According to the fifth aspect of the present invention, the capacity of each indoor unit can be individually controlled with respect to fluctuations in the calorific value distribution in the equipment room, and the temperature in the equipment room can be adjusted more finely. I can expect.

According to the sixth aspect of the present invention, the air flow rate of each indoor unit can be individually controlled with respect to fluctuations in the heat generation amount distribution in the equipment room, and the temperature in the equipment room can be adjusted more finely. Can be expected.

The invention according to claim 7 controls the air volume of each indoor unit individually with respect to fluctuations in the temperature of the cool air blown toward the suction surface of the rack in the equipment room and the temperature of the sneak current in the rack, Since the temperature of the can be adjusted more finely, further improvement in air conditioning efficiency can be expected.

According to the eighth aspect of the present invention, the used air in the equipment room can be smoothly returned to each indoor unit through the ceiling chamber, so that further improvement in air conditioning efficiency can be expected.

According to the ninth aspect of the present invention, each indoor unit can be freely attached to and detached from the chamber, so that mounting and replacement are simplified, and improvement in workability can be expected.

1 is a side view schematically showing an embodiment of an air conditioning system such as a communication / information processing equipment room according to the present invention. The side view seen from the AA arrow direction of FIG. The top view which shows an example of indoor unit installation. The top view which shows the modification of indoor unit installation. The top view which shows the further another modification of indoor unit installation. The top view which shows the further another modification of indoor unit installation. The figure explaining the Example which added the function which enables a dehumidification driving | operation to the said air conditioning system. The figure explaining the Example which added the function which controls an indoor unit with respect to the fluctuation | variation of the emitted-heat amount distribution to the said air conditioning system. The figure explaining the Example which added the function which detects the rack suction temperature and the temperature of the sneak current of the upper part of a rack, and controls the air volume of an indoor unit to the said air conditioning system. The top view explaining the outline | summary of the conventional air conditioning systems, such as a communication and information processing equipment room. The side view explaining the outline | summary of the conventional air conditioning systems, such as a communication and information processing equipment room.

The present invention achieves the object of improving the air conditioning efficiency of the electronic equipment room to reduce the thermal load of the server, eliminating unnecessary power energy consumption, contributing to energy saving, and obtaining a small and inexpensive air conditioning system. In order to accomplish this, a system in which racks in which communication / information processing devices are mounted in the vertical direction are aligned to form a rack row and air-condition a device room in which a plurality of rack rows are installed is provided on the suction surface of the rack. Cool air is blown out to the inside of the rack, and the cold air flows from the upstream side toward the downstream side. After the cooling of the communication / information processing device is finished, the used air discharged from the downstream side is sucked and cooled the high sensible heat type indoor unit for generating cool air to be blown again to the process toward the suction surface of the rack installed hanging a plurality ceiling of the equipment room, and the plurality Pedestal and respectively connected to a ceiling-mounted multi-air conditioner comprising the indoor unit in a small number of the outdoor unit than the number of indoor unit, and a controller for controlling the driving of the air conditioner, the provided, each indoor unit, adjacent A heat exchanger is installed in a box-shaped housing that is formed in a substantially square shape in plan view, and the heat exchanger has the above-mentioned used cold air from the side on four side surfaces facing the side surface in the equipment room. The heat exchanger is provided so as to be sucked toward the center, and is realized by rotating each heat exchanger by a predetermined angle in plan view so that the heat exchanger surfaces of the indoor units do not face each other .

  Hereinafter, an air conditioning system such as a communication / information processing equipment room according to an embodiment of the present invention will be described with reference to the drawings.

  1 and 2 schematically show an embodiment of an air conditioning system such as a communication / information processing equipment room according to the present invention, FIG. 1 is a side view thereof, and FIG. 2 is a line AA in FIG. It is the side view seen from the arrow direction.

  In this figure, this air conditioning system includes a communication / information processing device 12 (hereinafter simply referred to as “electronic device”) on a floor 11a in a communication / information processing device room 11 (hereinafter simply referred to as “device room 11”). 12 ”) is provided in four rows L1 to L4. A passage space portion 14 is formed between the rack rows L1 and L2 and between the rack rows L3 and L4. Further, passage space portions 15 are formed between the rack rows L2 and L3, between the rack row L1 and the equipment wall portion 11b, and between the rack row L4 and the equipment wall portion 11b, respectively.

  The width of the passage space portion 14 and the passage space portion 15 is usually about 1200 mm. Further, in the present embodiment, the front or rear surfaces of the racks 13 face each other in each rack row, but the front surfaces of the racks 13 face each other in the passage space portion 14 in this way. It is desirable to install.

  On the other hand, the ceiling unit 11c of the equipment room 11 is provided with an indoor unit 16a of the ceiling-mounted multi-air conditioner 16 in a state of being suspended from the ceiling unit 11c. A plurality of the indoor units 16 a are arranged for each passage space 14 so as to form a line along the passage space 14.

  The air conditioner 16 includes the indoor units 16a, 16a, and an outdoor unit 16b installed outside the equipment room 11, and a refrigerant pipe is provided between the indoor units 16a, 16a, and the outdoor unit 16b. 16c is connected. The refrigerant is supplied to the heat exchangers 20a of the indoor units 16a, 16a, and the cooling coil 16e of the outdoor unit 16b through electronic expansion valves 16d for adjusting the refrigerant flow rate. In addition, the refrigerant pipe 16c is disposed, for example, through a ceiling space 18 formed between the panel 17 attached to the inside of the ceiling portion 11c and the ceiling portion 11c. Several indoor units 16a, 16a,... Can be connected to 16b. The air conditioner 16 is configured as a high sensible heat type multi air conditioner by connecting several indoor units 16a, 16a... To one outdoor unit 16b.

  A plurality of indoor units 16a, 16a,... Suspended from the ceiling portion 11c are arranged for each of the passage spaces 14 and 14 so as to form a row along the passage spaces 14 and 14. These indoor units 16a, 16a ... and the rack rows L1 to L4 are structurally separated, and an open space is provided between each indoor unit 16a, 16a ... and each rack row L1 to L4. It has become.

  Each of the indoor units 16a, 16a,... Has a cold air outlet 19 on the inclined panel surface facing the rack suction surface 13a on the front surface of the rack 13, and has an upper portion of the equipment room 11 on four side surfaces. A box-shaped casing 21 having air inlets 20 for taking in high-temperature air in the space is provided, and the heat exchanger 20 a and the blower 22 are arranged in the box-shaped casing 21.

  Further, as shown in FIG. 3 or FIG. 4, each of the indoor units 16a, 16a... Has a heat exchange so that the heat exchangers 20a provided on the side surfaces of the indoor units 16a, 16a do not face each other. .. Are rotated by a predetermined angle in plan view. In this way, the heat exchangers 20a, 20a, ... in the indoor units 16a, 16a, ... are placed in a state in which all four ports are always open, and the high temperature air in the upper space of the equipment room 11 is discharged. The indoor units can be smoothly taken into the heat exchangers 20a, 20a.

  The installation of the indoor units 16a, 16... Is not limited to this structure, and various variations are possible. For example, a configuration as shown in FIG. That is, in the configuration shown in FIG. 5 or FIG. 6, the indoor units 16a, 16a,... Are arranged in an aligned manner by rotating the heat exchangers 20a, 20a,. , 16a,...

  Next, the operation of the air conditioning system configured as described above will be described. When the air conditioner 16 is driven, the blower 22 rotates, and the cool air cooled by the internal cooling coil rides on the wind generated by the blower 22 and passes through the cool air outlet 19 to the front of the rack 13. Blow out toward the rack suction surface 13a. The cold air blown toward the rack suction surface 13a flows toward the passage space 15 through the rack 13, and at this time, the electronic device 12 in the rack 13 is deprived of heat and the electronic device 12 is cooled.

  Also, the air that has been deprived of heat from the electronic device 12 and discharged into the passage space 15 is sucked into the indoor units 16a and 16a through the intake ports 20 and 20 of the indoor units 16a and 16a. It is. Then, each of the indoor units 16a, 16a,... Is cooled by the heat exchangers 20a, 20a, and then put on the wind generated by the blower 22, and the rack sucks the air through the cold air outlet 19. It is sent out again toward the surface 13a. The entire inside of the equipment room 11 is air-conditioned by this air circulation.

  In the present embodiment, the amount of air blown to each rack suction surface 13a of each of the rack rows L1 and L2 and each rack suction surface 13a of the rack rows L3 and L4, That is, the amount of air blown out toward the rack suction surface 13 a facing each passage space 14 is the amount of used cold air discharged through the rack 13 to the downstream side, that is, into the passage space 15. It is set to be larger than. This adjustment is controlled by the controller 23.

  As described above, the exhaust amount of the used air discharged from the downstream side through the rack 13 by using the air volume blown out toward the rack suction surface 13a facing the passage space 14 by the indoor units 16a, 16a. If it is set larger than the amount, the blowout side (upstream side) has a high pressure, and the suction side has a low pressure. Leaked cold air 24a returning to the side 16a, 16a... (See FIG. 1) or used air bypassing back to the intake ports 20, 20,. Cold air 24b (see FIG. 1) can be prevented. At this time, for example, by providing a curtain or an opening / closing door between the rack height of each passage space 14 on the blowing side and the floor surface and closing it, the effect of preventing bypass can be further enhanced.

  Therefore, according to the air conditioning system according to the present embodiment, the indoor units 16a, 16a... Of the air conditioner 16 are installed on the ceiling portion 11c of the equipment room 11, so that a plurality of indoor units 16a, 16a. Can be installed in the equipment room 11 in a compact manner, and a reduction in the size of the equipment room can be expected. Moreover, since the cooling process of the cold air can be performed only in the equipment room 11 without using the floor portion 11a as a double structure, it is possible to reduce restrictions when installing the indoor units 16a. .

  In the air conditioning system, in addition to the basic configuration described above, configurations of the embodiments described below can be added.

  FIG. 7 shows an embodiment in which in the basic configuration for performing the high sensible heat operation, when dehumidification is required, such as when air conditioning is started up, a function for enabling the dehumidification operation by switching the mode by the controller 23 is shown. . In FIG. 7, a suction temperature sensor T1 for detecting the temperature of used cold air sucked from the intake port 20 around the indoor units 16a, 16a... And a suction for detecting the humidity of used cold air sucked from the intake port 20 are used. While providing the humidity sensor W, the refrigerant | coolant piping 16c is provided with the refrigerant | coolant temperature sensor T2, and it is comprised so that each information of each sensor T1, T2, and W may be sent to the said controller 23. FIG. Then, the controller 23 switches the operation mode when the dehumidification is necessary, such as when starting the air conditioning, based on the information of each sensor T1, T2, W, and performs the dehumidifying operation for a preset time. When no longer needed, switch to high sensible heat treatment operation.

  FIG. 8 shows an embodiment in which a function of controlling the indoor units 16a, 16b,... For each unit is added to the fluctuation of the calorific value distribution in the equipment room 11 in the basic configuration. In FIG. 8, a suction temperature sensor T1 for detecting the temperature of the used cold air sucked from the intake port 20 around the indoor units 16a, 16a,... And the temperature of the cold air blown from the cold air outlet 19 are detected. A blowing temperature sensor T3 is provided, and the information of each sensor T1, T3 is sent to the controller 23. Then, the controller 23 detects the fluctuation of the calorific value distribution in the equipment room 11 from each information of the sensors T1, T3, performs the capacity control of the indoor units 16a, 16b,. The temperature inside the equipment room 11 is adjusted more finely to improve the air conditioning efficiency.

  The controller 23 detects the fluctuation of the heat generation amount distribution in the equipment room 11 from the information of the sensors T1 and T3, and controls the blowers 22 of the indoor units 16a, 16b,. By controlling the air volume of each of the fans 22, the temperature inside the device room 11 can be adjusted more finely to improve the air conditioning efficiency.

  FIG. 9 is a diagram showing an indoor unit that detects the temperature of the cold air blown toward the rack suction surface 13a facing each passage space 14 in the equipment room 11 and the temperature of the sneak current into the rack 13 in the above-described basic configuration. The Example which added the function to perform air volume control is shown. In FIG. 9, a blowing temperature sensor that detects the temperature of the cold air blown out from the cold air blowing port 19 toward the rack suction surface 13a facing the passage space 14 around the cold air blowing port 19 of the indoor units 16a, 16a. T3 and a rack suction temperature sensor T4 for detecting the temperature of the cold air flowing into the rack 13 from the rack suction surface 13a are provided, and each information of the sensors T3 and T4 is sent to the controller 23. In the controller 23, the air volume control of the blower 22 in the indoor units 16a, 16b,... Is performed for each unit from the information of the sensors T3, T4, and the temperature inside the device room 11 is adjusted more finely. To improve air conditioning efficiency.

  It should be noted that the present invention can be variously modified without departing from the spirit of the present invention, and the present invention naturally extends to the modified ones.

  For example, a ceiling space (chamber) 18 is provided between the ceiling 11 c in the device room 11 and the panel 17. Further, the panel 17 is provided with a blowout port and an intake port, and the cold air blowout ports 19 of the indoor units 16a, 16a,. It is also possible to adopt a configuration in which 16a, 16a... Are detachably provided by a cassette method.

  The present invention is not limited to an air conditioning system such as a communication / information processing electronic device room in which a plurality of electronic devices with high heat generation density such as electronic devices for communication / information processing are arranged, and can be widely applied to general air conditioning systems. .

11 Communication and information processing equipment room (equipment room)
11a Floor 11b Equipment wall 11c Ceiling 12 Communication / information processing equipment (electronic equipment)
13 Rack 13a Rack suction surface L1-L4 Rack row 14 Passage space part 15 Passage space part 16 Air conditioner (ceiling installation type multi air conditioner)
16a Indoor unit 16a Outdoor unit 16c Refrigerant piping 16d Electronic expansion valve 16e Cooling coil 17 Panel 18 Ceiling space 19 Cold air outlet 20 Air inlet 20a Heat exchanger 21 Box-shaped housing 22 Blower 23 Controllers 24a and 24b Leaked cold air T1 Suction temperature sensor T2 Refrigerant temperature sensor T3 Outlet temperature sensor T4 Rack suction temperature sensor W Suction humidity sensor

Claims (9)

A system in which racks in which communication / information processing devices are mounted in the vertical direction are arranged to form a rack row and air-condition the equipment room in which a plurality of the rack rows are installed,
Use of air that blows out cold air toward the suction surface of the rack, flows the air into the rack, flows from the upstream side toward the downstream side, and is discharged from the downstream side after cooling of the communication / information processing device A plurality of high sensible heat indoor units are installed on the ceiling of the equipment room to generate cool air that is sucked into the air, cooled, and blown out toward the suction surface of the rack. A ceiling-mounted multi-air conditioner in which a plurality of indoor units are respectively connected to a smaller number of outdoor units than the number of the indoor units, and a controller for controlling the driving of the air conditioner ,
The indoor units are arranged adjacent to each other, and a heat exchanger is installed in a box-shaped housing formed in a substantially square shape in plan view. The heat exchangers are arranged on four side surfaces facing the side surfaces in the equipment room. Provided so that used cold air is sucked in from the side toward the center, and each heat exchanger is rotated by a predetermined angle in plan view so that the heat exchanger surfaces of the indoor units do not face each other. air conditioning system such as a communication and information processing equipment chamber, characterized by comprising Te.   The controller is configured so that the amount of cool air blown out by the indoor units toward the suction surface of the rack is larger than the amount of used air discharged from the downstream side through the rack. 2. An air conditioning system for a communication / information processing equipment room or the like according to claim 1, wherein the indoor unit is controlled.   The air conditioning system for a communication / information processing equipment room or the like according to claim 1 or 2, wherein each of the indoor units can be switched to a dehumidifying operation when dehumidifying is required. The box Katachikatamitai the claims 1 communication and information processing equipment room such as an air conditioning system according to characterized in that provided cool air outlet for blowing out the cool air to the inclined panel surface facing the suction surface of the rack. The controller may communicate according to claim 1, 2, 3 or 4, wherein the formed by individually capacity capable of controlling the respective indoor units to variations in the calorific value distribution chamber the instrument・ Air conditioning systems for information processing equipment rooms. The controller may claim 1, 2, 3, characterized in that formed by each air blowing amount capable of controlling the respective indoor units to variations in the calorific value distribution chamber the instrument, was 4 or 5 Air conditioning system for the communication / information processing equipment room described. The controller detects the temperature of the cold air blown toward the suction surface of the rack and the temperature of the sneak current of the upper part into the rack, respectively, and individually controls the air volume of each indoor unit. An air conditioning system for a communication / information processing equipment room or the like according to claim 6 . A chamber is provided in the ceiling of the equipment room, and cool air is blown out from a blowout port provided on the ceiling surface toward a suction surface of the rack, and air returning from the room is passed through the ceiling chamber from a suction port provided on the ceiling surface. suction to indoor unit, according to claim 1, 2, 3, 4 formed by configured to return to the indoor units the ceiling chamber as urethane chamber, such as communication and information processing equipment room 6 or 7, wherein Air conditioning system. 9. The air conditioning system for a communication / information processing equipment room or the like according to claim 8, wherein each of the indoor units is formed into a cassette and is detachably attached to the chamber.

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