JP4651810B2 - Air conditioning method and air conditioning system for communication equipment room, etc. - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an air conditioning method for a communication equipment room or the like and a system thereof.
[0002]
[Prior art]
In the computer room and OA room, most of the air conditioning heat load is sensible heat load, and the average heat density per floor area is about 500 W / m ² . In such facilities, full sensible heat treatment type packaged air conditioners are often used because of the ease of construction and maintenance and the ability to disperse heat sources.
[0003]
The room structure of these facilities requires a large number of power cables and signal cables, and many of them have a double floor structure, and the underfloor chamber is used as a wiring space. In order to use the underfloor chamber as an air path in air conditioning with a packaged air conditioner, the upper suction / lower blowing system is used. The low-temperature air treated by the packaged air conditioner is transported to the installation location of a computer, etc. through the underfloor chamber, The low-temperature air is supplied to the inside of the equipment casing from the opening of the equipment to treat the exhaust heat from the equipment.
[0004]
A conventional method of configuring such an air conditioning system is shown in FIG. The full sensible heat treatment type packaged air conditioner 101 includes a direct expansion coil 101a and a blower 101b. The direct expansion coil 101a includes an outdoor unit 101c and a refrigerant pipe 101d installed outside the communication device room R. Tied. The temperature of the air blown out from this all-sensible heat treatment type packaged air conditioner 101 is normally 15 to 20 ° C., and the exhaust from the equipment casing 102 and the blowout opening 103a into the room 103 on the floor 103 in the communication equipment room R, The air mixed with the air blown from the air outlet 103b corresponding to the device, that is, the return air temperature to the packaged air conditioner 101 is about 25 ° C. Therefore, the processing temperature difference in the full sensible heat treatment type package air conditioner 101 is about 5 to 10 ° C. The cooling capacity per unit of all sensible heat treatment type packaged air conditioners currently commercialized is about 10-40 kW, and the number of packaged air conditioners according to the air conditioning heat load is installed along the indoor wall surface in the facility. Air conditioning.
[0005]
In addition to the above-described package air conditioner method, there is a method using an air conditioner with a built-in cold water coil as a cooling device. In this case, a refrigerator and a cooling tower are used as the heat source device. For example, in the one disclosed in Japanese Patent No. 2997661, two cooling coils are arranged in series with respect to the flow of processing air in an air conditioner to perform primary cooling and secondary cooling. In this open technology, the chilled water supply to the primary cooling coil can be switched between a chilled water system made by a refrigerator and a chilled water system made by free cooling of a cooling tower. The latter is a system in which water after gas-liquid contact in a cooling tower is introduced into a heat exchanger for treating heat load and cooled. In winter and in the mid-term, when the temperature of the outdoor wet bulb is low, cold water is supplied by free cooling of the cooling tower to reduce the operation time of the refrigerator and save energy. Furthermore, by using two cooling coils for primary cooling and secondary cooling in series, the amount of change in cooling capacity due to fluctuations in the outside air conditions during free cooling operation of the cooling tower for primary cooling can Is to be corrected.
[0006]
[Problems to be solved by the invention]
By the way, with the development of communication technologies such as the Internet, many communication bases have been constructed. In communication equipment rooms in these facilities, as shown in FIG. 5, a large number of racks 111 containing a plurality of communication equipment such as servers and routers are arranged in the room. In these facilities, most of the air conditioning heat load is sensible heat load, and the heat generation density is much larger than that of a general computer room. This trend is expected to continue for the time being, and the average heat density per floor area is expected to exceed 1000 W / m ² .
[0007]
When air-conditioning equipment rooms with high heat generation density, the number of conventional all-sensible heat treatment type packaged air conditioners used in the conventional computer room is increased according to the heat load. However, the number of installed packaged air conditioners will increase significantly, and indoor units may not be able to be installed using only the indoor wall surface in the facility. Also, as the number of packaged air conditioners increases, the amount of air blown increases significantly, and the air blowing resistance in the lower space of the double floor increases. Therefore, the conventional method of adding a packaged air conditioner not only makes it difficult to secure the installation space for the indoor unit, but also increases the blast energy.
[0008]
Furthermore, according to the latter published technology, the cooling heat source is a centralized heat source of the same system, and if a failure or accident occurs around the refrigerator in the summer operation mode with only the refrigerator, the air conditioning heat source is completely stopped. There is a risk that it will end. In the case of repair or maintenance of an air conditioner, one air conditioner is completely stopped, and the room temperature of the area that the air conditioner is responsible for rises. Also, in facilities where the air conditioning heat load is significantly large, the capacity of the equipment increases, so the amount of heat source equipment (refrigerator / cooling tower) installation space and piping is enormous, and a large machine room and pipe shaft space are required. There is also a problem that the ability is reduced.
[0009]
The present invention has been made in view of such points, and a flexible operation pattern of a cooling device is implemented in a facility of a room in which various devices having high-density exhaust heat such as communication devices and computers are installed. An object of the present invention is to provide an air conditioning method and an air conditioning system that can save space and energy.
[0010]
[Means for Solving the Problems]
In order to achieve the above object, according to the present invention, there is provided a method for air conditioning in a communication equipment room or the like, comprising a primary cooling device and a secondary cooling device with different cooling sources, and the primary cooling device is a cold water source. so as to cool the air to be treated by, the secondary cooling device so as to cool the air to be treated by a direct膨作has a plurality of the primary cooling device, the outlet side of the air of the primary cooling device in parallel connected to said a plurality of secondary cooling device, the inlet side of the air of the secondary cooling device is connected in parallel, the outlet air after being processed by each primary cooling device, each secondary Sent to the cooling device in parallel, and in each secondary cooling device, the outlet air is further processed, and the outlet air of each secondary cooling device is supplied to the communication equipment room or the like as supply air, An air conditioning method for a communication equipment room or the like is provided. In this specification, “communication equipment” refers to various equipment with high-density exhaust heat, such as communication equipment, computers, etc., and “communication equipment room” refers to a room in which such various equipment is installed. Say.
[0011]
In this way, the primary cooling device and the secondary cooling device having different cooling heat sources are sent to the respective secondary cooling devices by the outlet air after being processed by each primary cooling device. Since the outlet air is further processed , large temperature difference cooling can be performed, and the amount of blown air can be reduced. In addition, because different cooling sources are used, flexible operation patterns can be implemented, and it is not necessary to stop all cooling devices in the event of failure or maintenance. For example, a central processing type using cold water as a heat source is suitable for the primary cooling device, and a distributed type air conditioning device such as an air-cooled packaged air conditioner is suitable for the secondary cooling device.
[0012]
Also, there are multiple primary cooling units , the air outlet sides of each primary cooling unit are connected in parallel, and there are multiple secondary cooling units , and the air inlet sides of these secondary cooling units are connected in parallel. The outlet air connected and processed by each primary cooling device is sent in parallel to each secondary cooling device, and each secondary cooling device further processes the outlet air, and each secondary cooling device. in the outlet air as the supply air was then supplied to the communication equipment room or the like, for example be stopped is the primary cooling system and the secondary cooling device at any reason, all other not stopped cooled It is possible to always carry out large temperature difference cooling using the apparatus, that is, air conditioning in which the temperature difference between the return air from the room and the supply air to the communication device or the like as the target load is large.
[0013]
The primary cooling device used in the present invention is preferably a cooling device having a cold water coil, and the secondary cooling device is suitably an all-sensible heat treatment type packaged air conditioner having a direct expansion coil. In this case, the chilled water in the chilled water coil is chilled water produced by a freezer during the summer, and chilled water produced by free cooling of the cooling tower is used in the winter or mid-term, resulting in a highly energy-saving air conditioning operation. Can be done. The return air in the communication equipment room is preferably processed by a primary cooling device.
[0014]
In the communication equipment room, there is often a maintenance area for normal personnel to perform maintenance work on the communication equipment, etc., but the area does not have enough heat to perform large temperature differential cooling. It is practical to take a part of the outlet air of the primary cooling device and use it as air-conditioning air in the maintenance area, and wasteful consumption of energy can be suppressed.
[0015]
The air conditioning system according to the present invention is an air conditioning system for a communication equipment room or the like as claimed in claim 4 , wherein a plurality of primary cooling devices and a plurality of secondary cooling devices having different cooling sources are used. A primary communication duct that connects at least the air outlet sides of the plurality of primary cooling devices in parallel; a secondary communication duct that connects the air inlet sides of the plurality of secondary cooling devices in parallel; and the primary communication a communicating duct for connecting the duct and the secondary communicating duct, the outlet air of the secondary cooling device each have a supply unit for supplying to the communication equipment chamber or the like, to the inlet side of the respective secondary cooling device Is provided with an air conditioning system such as a communication equipment room, which is provided with a damper .
[0016]
In this case, either the primary communication duct or the secondary communication duct may have a function as a communication duct. Furthermore, as in the embodiments described later, the primary communication duct and the secondary communication duct may be combined. That is, the primary communication duct, the secondary communication duct, and the communication duct, configured as is shared by the combined duct connecting the inlet side of the air at least the air outlet side or the secondary cooling device the primary cooling device May be.
[0017]
According to such a system, the air treated by the primary cooling device can be further treated by the secondary cooling device to carry out large temperature difference cooling, and a flexible operation pattern can be implemented. It is not necessary to stop all cooling devices. Moreover, it is possible to always perform large temperature difference cooling using all other cooling devices that are not stopped. In addition, since the processing air is mixed by the communication duct, it is possible to alleviate the shortage of the cooling amount that occurs when the heat load is unevenly distributed.
[0018]
In this case, if an individual supply unit for supplying a part of the outlet air of the primary cooling device to the maintenance area in the communication device room is provided, a part of the outlet air of the primary cooling device is taken out and air conditioning in the maintenance area is performed. It can be used as working air.
[0019]
The apparatus further comprises a refrigerator for supplying cold water to the cold water coil unit, and a cooling tower for supplying cooling water to the condenser of the refrigerator, and the cooling water from the cooling tower can also be supplied to the cold water coil unit. In this way, the chilled water used in the chilled water coil unit is energy-saving by using chilled water produced by a freezer in the summer and cold water produced by free cooling of the cooling tower in the winter or intermediate period. Highly effective air-conditioning operation can be performed. The cooling on the condenser side in the refrigerant cycle of the secondary cooling device including the direct expansion coil is preferably an air cooling method.
[0020]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, a preferred embodiment of the present invention will be described. FIG. 1 shows an outline of the configuration of the entire air conditioning system according to the present embodiment. In this system, a plurality of cold water coil units 2 each having a cold water coil 1 are provided as primary cooling devices. Each of the chilled water coil units 2 is provided with a casing, a flange for connecting a duct, and if necessary, an automatic valve around the inlet / outlet of the chilled water coil. The chilled water heated by the heat exchange with the processing air in 1 is returned by the return pipe 5.
[0021]
The outgoing pipe 4 is connected to a cold water outgoing pipe 6 to which cold water from the evaporator 3 a of the refrigerator 3 is supplied, and the return pipe 5 is connected to a cold water return pipe 7. Valves V1 and V2 are interposed in the cold water outgoing pipe 6 and the cold water return pipe 7, respectively. Further, between the condenser 3 b of the refrigerator 3 and the cooling tower 11, an outgoing pipe 12 of the raised cooling water and a return pipe 13 of the lowered cooling water are piped. Valves V3 and V4 are interposed in the cooling water forward pipe 12 and the cooling water return pipe 13, respectively. The cooling water outgoing pipe 12 and the cooling water return pipe 13 are also connected to the outgoing pipe 4 and the return pipe 5 via connecting pipes 15 and 16 on the way. The connecting pipes 15 and 16 are provided with valves V5 and V6. In addition, although the closed type cooling tower is shown in FIG. 1, even if it comprises a system with an open type cooling tower, an effect | action does not change.
[0022]
Therefore, by the switching opening / closing operation of the valves V1 to V6, the cold water coil 1 has cold water from the circulation system to the evaporator 3a of the refrigerator 3 and cooling water from the circulation system to the cooling tower 11. Can be supplied.
[0023]
A supply duct 21 for sending air after being cooled by the cold water coil 1 is provided on the outlet side of the air to be treated of the cold water coil 1 of each cold water coil unit 2. The communication duct 22 communicates. Each supply duct 21 is provided with a damper D1. The primary communication duct 22 is connected to a plurality of communication ducts 23, and the plurality of communication ducts 23 are connected to a secondary communication duct 24. The primary communication duct 22 and the secondary communication duct 24 constitute a header duct.
[0024]
The secondary communication duct 24 is connected with a plurality of introduction ducts 32 for introducing process air into the inlet of the direct expansion coil 33 of the all-sensible heat treatment type package air conditioner 31 as a secondary cooling device. Each introduction duct 32 is provided with a damper D2.
[0025]
Each fully sensible heat treatment type packaged air conditioner 31 heat-exchanges between the air introduced from the introduction duct 32, that is, the air treated by the cold water coil unit 2 and the direct expansion coil 33 to lower the temperature. The air blower 34 blows out the air supply. Each full sensible heat treatment type packaged air conditioner 31 has an outdoor unit 35, in which the refrigerant is circulated between the direct expansion coil 33 through the refrigerant pipe 36 and the heat of condensation is radiated by the fan 37. It is. Then, the refrigerant expands in the direct expansion coil via a decompression device such as a compressor and an expansion valve, and is cooled by evaporation. Although not shown, a control mechanism is provided that does not process the latent heat of the air to be processed but processes all sensible heat. Further, in the drawing, the outdoor unit 35 has a compressor and a so-called multi-system that covers a plurality of indoor units is adopted, but a system having a compressor in the indoor unit may be used. Further, for example, a wall-through type air conditioner in which an indoor unit and an outdoor unit are integrated may be used.
[0026]
A supply duct 38 for directly supplying the outlet air of the cold water coil unit 2 is connected to the secondary communication duct 24 separately. The blower 39 can supply the outlet air of the cold water coil unit 2 to a predetermined maintenance area.
[0027]
The outline of the entire air conditioning system according to the embodiment has the above-described configuration. With such a configuration, the chilled water coil 2 as the primary cooling device sucks high-temperature air in the upper space in the communication device room, for example, cools it to the middle temperature range, and then the package air conditioner 31 as the secondary cooling device. The direct expansion coil 33 cools the air in the middle temperature range to the low temperature range. For example, when the air in the high temperature range is 40 ° C., it becomes possible to perform large temperature difference cooling in steps of 40 ° C. (high temperature range) → 25 ° C. (medium temperature range) → 15 ° C. (low temperature range). ing. An outside air conditioner and an exhaust fan (not shown) are connected to the outside air introduction port and the exhaust port via appropriate ducts (not shown) and provided on the wall of the chamber. The outdoor air conditioner does not dehumidify or humidify the outside air, and the primary and secondary cooling devices are operated so that the air to be treated does not fluctuate as much as possible. Next, the configuration applied to the communication equipment room will be described in more detail with reference to FIGS.
[0028]
As shown in FIG. 2, the floor of the communication device room R to be air-conditioned has a double floor structure and has an underfloor chamber 51. On the floor F, racks 53 in which various communication devices 52 such as servers are mounted in multiple stages are installed indoors at predetermined intervals. A fan 54 for blowing up the atmosphere in the rack upward is provided at the top of the rack 53. The space between the racks 53 and the space between the inner wall of the room and the rack 53 create a maintenance area M.
[0029]
The all-sensible heat treatment type package air conditioner 31 is installed on the wall surface in the communication equipment room R, and the cold water coil 1 (primary cooling device) is installed in the upper space. The processing air outlet space of the plurality of cold water coils 1 is a dual-purpose duct DD that also serves as the primary communication duct 22, the communication duct 23, and the secondary communication duct 24. The introduction duct 32 of the type package air conditioner 31 is connected. The cold water coil unit 2 has an air suction port in the depth direction of the communication device room R and an air discharge port toward the connection duct 32, and the other surfaces are closed.
[0030]
The low-temperature air blown out from the lower part of the fully sensible heat treatment type package air conditioner 31 by the blower 34 is blown into the underfloor chamber 51, below the rack 53 in the communication equipment room R, and in accordance with the bottom opening position of the rack 53. The air flows into the rack 53 from the blowout port 55 formed.
[0031]
A blower 40 is installed on the floor F of the maintenance area M, and conditioned air from the supply duct 38 connected to the upstream side of the damper D2 in the introduction duct 32 is blown out to the maintenance area M by the blower 39. It is possible. The blow-out device 40 includes a diffuser plate or the like and a blow-out port face having a diffusion function, and the other is a casing closed except for a connection port with the introduction duct 32. From the blowout face, conditioned air is blown out in the depth direction of the room so that the room has a uniform temperature. You may incorporate the air blower 39 as needed. As an example of operation, for example, an indoor environment in which temperature stratification is maintained in a room is formed by blowing off the floor at low speed.
[0032]
The air conditioning system according to the present embodiment has the above-described configuration. For example, in the case of normal operation in summer, cold water from the refrigerator 3 is sent to each cold water coil 1 and is stored in the communication equipment room R. The upper hot air is treated and cooled to about 25 ° C., for example. The air treated by each cold water coil 1 is sent into the dual-purpose duct DD, and is then cooled by the fully sensible heat treatment type package air conditioner 31 through the introduction duct 32, for example, to about 15 ° C. It is blown out into the chamber 51.
[0033]
The low-temperature air blown into the underfloor chamber 51 flows into the rack 53 from the blowout port 55, processes the heat generated by the communication device 52 in the rack 53, and is installed in the communication device room R by the fan 54 above the rack 53. It is exhausted upward. The exhausted high-temperature air moves while staying in the upper space of the communication equipment room R, is sucked into the cold water coil 1, and again by the primary cooling by the cold water coil 1 and the secondary cooling by the all-sensible heat treatment type package air conditioner 31. Large temperature difference cooling is performed and the air is blown out again into the underfloor chamber 51.
Therefore, according to the present embodiment, since the air conditioning of the communication device room R is performed by such a large temperature difference cooling by the primary cooling and the secondary cooling, it is possible to reduce the amount of blown air. The number of installations can be smaller than before. Therefore, the rentable ratio is improved.
[0034]
In addition, since the primary cooling by the cold water coil 1 and the secondary cooling by the all-sensible heat treatment type package air conditioner 31 are different heat sources, even if one of the operations is stopped due to an unexpected situation, the communication equipment room Not all air conditioning for R stops. Even when a part of the packaged air conditioner 31 that is the secondary cooling device is stopped due to maintenance or failure, all the cold water coils 1 as the primary cooling device can be used.
[0035]
The processing air outlet side of the chilled water coil 1 and the processing air inlet side of the packaged air conditioner 31 are connected and communicated with each other by a dual-purpose duct DD, and each packaged air conditioner 31 has an introduction duct 32 and a damper D1. While maintaining these advantages, these devices can divide the inside of the communication device room R into several zones to cover the load for each zone. As a result, even when the number of chilled water coils 1 and packaged air conditioners 31 in the zone is controlled, a large temperature is generated by primary cooling and secondary cooling using all other cold water coils 1 and packaged air conditioners 31 that are not stopped. Differential cooling is possible.
[0036]
Furthermore, various cooling patterns such as the number control operation of the packaged air conditioner 31 and the air blowing operation (stopping only the compressor and operating the air blower 34) can be performed while cooling with the cold water coil 1. Further, since the processing air is mixed by the dual-purpose duct DD, it is possible to alleviate the local shortage of cooling caused by the temperature difference of the return air when the heat load is unevenly distributed.
[0037]
As described above, the heat source of the cold water coil 1 uses cold water produced by the refrigerator 3 in the summer, but the valves V1 to V6 are switched in the winter and intermediate periods when the outdoor wet bulb temperature is low. Using the cooling water from the cooling tower 11 directly as a cold heat source, it is possible to use cold water produced by so-called free cooling, and energy saving operation can also be achieved. Because the fluctuation of the cooling capacity of the primary cooling system is covered by the second stage direct expansion coil, the free cooling period can be extended and the annual operating cost of the refrigerator can be further reduced. In this way, by using the primary cooling device as a cold water coil, the energy saving effect by free cooling can be further enhanced.
[0038]
It is preferable that the cold water temperature and the refrigerant evaporation temperature of the cold water coil 1 of the primary cooling device and the direct expansion coil 33 of the packaged air conditioner 31 of the secondary cooling device are controlled to temperatures at which no condensation occurs on the coil surface. It is possible to obtain a humidity atmosphere that is always favorable for the communication equipment and the like housed in the rack in the communication equipment room R.
[0039]
Moreover, since the condenser of the outdoor unit 35 of the all-sensible heat treatment type package air conditioner 31 is air-cooled, it can be installed dispersedly on the veranda etc. of each communication equipment room R, and the space can be used effectively. It is.
[0040]
Furthermore, since the air-conditioning air having an appropriate temperature is separately supplied to the maintenance area M where personnel are working by the blow-out device 40, a suitable maintenance environment without waste is realized by effectively using energy. .
[0041]
According to the present invention, as described above, since the large temperature difference cooling is performed, the air conditioning of the room where the computer and various high-density heating devices are installed as well as the communication equipment room described above. A significant reduction in the amount of air blowing required can be realized. In addition, the installation area of the air conditioner can be reduced.
[0042]
【The invention's effect】
According to the present invention, a flexible operation pattern of a cooling device can be implemented in a facility with high-density exhaust heat from a communication device or the like, and space and energy can be saved.
[Brief description of the drawings]
FIG. 1 is an explanatory diagram showing an outline of the overall configuration of an air conditioning system according to an embodiment of the present invention.
FIG. 2 is an explanatory diagram showing an outline of a configuration of an air conditioning system according to an embodiment of the present invention applied to a communication equipment room.
FIG. 3 is an explanatory diagram of a cross section taken along line AA in FIG. 2;
FIG. 4 is an explanatory diagram of the prior art.
FIG. 5 is a perspective view showing an outline of a communication equipment room.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Cold water coil 2 Cold water coil unit 3 Refrigerator 4 Outgoing pipe 5 Return pipe 11 Cooling tower 22 Primary communication duct 23 Communication duct 24 Secondary communication duct 31 Package air conditioner 32 Introduction duct 33 Direct expansion coil 34, 39 Fan 35 Outdoor unit 38 Supply Duct 51 Floor chamber 52 Communication equipment 53 Rack DD Duct F Floor M Maintenance area R Communication equipment room

Claims (7)

A method for air conditioning in a communication equipment room, etc.
A primary cooling device and a secondary cooling device with different cooling sources ;
The primary cooling device cools the air to be treated with cold water, the secondary cooling device cools the air to be treated by direct expansion,
A plurality of the primary cooling devices , the air outlet side of each primary cooling device is connected in parallel;
There are a plurality of the secondary cooling devices , and the air inlet sides of these secondary cooling devices are connected in parallel,
The outlet air after being processed by each primary cooling device is sent in parallel to each secondary cooling device, and in each secondary cooling device, the outlet air is further processed, and the outlet air of each secondary cooling device. Is supplied to the communication equipment room or the like as a supply air. A method for air conditioning in a communication equipment room, etc.
A primary cooling device and a secondary cooling device with different cooling sources are connected in series,
The primary cooling device is cooled by cold water, the secondary cooling device is cooled by direct expansion, the outlet air of the primary cooling device is further processed by the secondary cooling device, and the outlet air of the secondary cooling device is cooled. Is supplied to the communication equipment room etc. as air supply,
An air conditioning method for a communication equipment room or the like, wherein a part of the outlet air of the primary cooling device is taken out and used as air conditioning air in a maintenance area of the communication equipment room or the like. The air conditioning method for a communication equipment room or the like according to claim 1 or 2, wherein the return air in the communication equipment room or the like is processed by a primary cooling device . A system for air conditioning in communication equipment rooms, etc.
A plurality of primary cooling devices;
A plurality of secondary cooling devices having different cooling sources from the primary cooling device;
A primary communication duct connecting at least the air outlet sides of the plurality of primary cooling devices in parallel;
A secondary communication duct connecting the air inlet sides of a plurality of secondary cooling devices in parallel;
A communication duct connecting the primary communication duct and the secondary communication duct;
A supply unit for supplying the outlet air of each of the secondary cooling devices into the communication equipment room or the like,
An air conditioning system for a communication equipment room or the like, wherein a damper is provided on each inlet side of each secondary cooling device. A system for air conditioning in communication equipment rooms, etc.
A plurality of primary cooling devices;
A plurality of secondary cooling devices having different cooling sources from the primary cooling device;
A primary communication duct connecting at least the air outlet sides of the plurality of primary cooling devices in parallel;
A secondary communication duct connecting the air inlet sides of a plurality of secondary cooling devices in parallel;
A communication duct connecting the primary communication duct and the secondary communication duct;
A supply section for supplying the outlet air of the secondary cooling device into the communication equipment room or the like,
An air conditioning system for a communication equipment room or the like, comprising an individual supply unit that supplies a part of the outlet air of the primary cooling device to a maintenance area in the communication equipment room or the like. 5. The primary communication duct, the secondary communication duct, and the communication duct are shared by a dual-purpose duct that connects at least the outlet side of the primary cooling device or the inlet side of the secondary cooling device. Or an air conditioning system such as a communication equipment room according to 5; The primary cooling device is a cooling device having a cold water coil, and the secondary cooling device is a full sensible heat treatment type packaged air conditioner having a direct expansion coil. Air conditioning system for communication equipment rooms.

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