JP6180151B2 - Air conditioning system - Google Patents

Description

  The present invention relates to an air conditioning system in a space where information processing equipment such as a data center generates a large amount of heat.

In recent years, information processing equipment such as servers, routers, gateways, and network devices that are peripheral equipment of servers, for example, server rooms in data centers installed in rack-like containers, or advanced communication equipment are also rack-like. In a communication electronic equipment installation room installed in a container, or a computer room equipped with a high-performance supercomputer capable of high-speed and high-speed computation, information processing is progressing due to remarkable progress in the integration of arithmetic circuits in electronic information processing equipment. The heat generated by the devices also increases, and the information processing devices are increasingly integrated due to the downsizing of the information processing devices, so that the heat generation load per indoor flat area is increasing.
In order to maintain the normal operating environment of these information devices, the room is always cooled.

As described above, arithmetic circuits of electronic information processing devices that have been increasingly integrated, such as a central processing unit (MPU chip having a CPU function) and the like, require a lot of power for calculation and therefore generate a large amount of heat. However, since it is necessary to maintain a certain temperature environment in order to realize the calculation, heat generation must be quickly removed from the periphery of the calculation circuit. Even if the MPU chip has an air cooling mechanism, heat tends to be accumulated in the housing of the information processing apparatus that holds the substrate on which the MPU chip is mounted. For this reason, information processing devices usually have an air cooling fan.
When these information processing devices inhale high-temperature air, for example, when the temperature is likely to deviate from the temperature environment of the MPU chip, in order to prevent hardware destruction such as a short circuit accident due to heat of the fine CPU circuit, There is a case to avoid the heat rise by stopping the system. Even if the hardware destruction is avoided, the system operation stop causes an error in the arithmetic processing and the like, resulting in a large loss in the information processing business that can make money through the arithmetic processing and communication. Such troubles as a system stop must be avoided.

Even if air is cooled by an air conditioner and air is blown indoors due to an increase in heat generation and integration density, the cooling air in the information processing device is bad and the cold air cannot be supplied to the device, and the CPU Due to the emergency avoidance system stop for temperature protection, there is a frequent problem that information processing devices mounted on the rack are brought down one after another, and the supply of cool air to the place to be cooled indoors is an issue.
In addition, for example, in the business of a data center that rents a server rack installed room, the ratio of buildings that can install information processing equipment is increased, the rentable ratio of buildings excluding machine rooms is improved, and the absolute size of the server room is also increased. In order to increase the size, there is a demand to reduce the machine room with a minimum capacity of the air conditioner, without installing a large amount of air conditioner unnecessarily.

In general, as in conventional computer room air conditioning, cool air is introduced into the room through the floor outlet through the double floor as the supply air cooled by the air conditioner, and the exhaust heat from the indoor information processing equipment is cooled. An air conditioning system is employed in which the air is cooled by air circulation and is cooled by air circulation that returns the warmed return air to the air conditioner again through the ceiling through the ceiling.
This air conditioning system uses the underfloor space, which is essential for installing cables required for transmitting and receiving signals and power between information processing devices, supplies cold and heavy air from below, and heats the lightened air to the upper ceiling. The air conditioning system makes sense in an era when the integration degree of information processing equipment is small, such as returning to the air conditioner via

In particular, recent information processing equipment has a small cooling fan itself, and there is equipment in which the direction of air cooling is determined. In the case of a room that has such an information processing device, includes an information processing device arranged in a plurality of stages in a rack shape with the orientation of the information processing devices aligned, and blows out from under the double floor, “Cool aisle / hot aisle method” is adopted as the mainstream of the air conditioning system, with the rear faces facing each other, for example, cold air blown from under the double floor is sucked from the front of the information processing device and discharged to the rear as hot air Has been.
In the case of a double-floor blow-out server room, racks equipped with information processing equipment can be broadly divided into those that supply air from the front and exhaust the back and top, and those that supply air from the bottom and back and There are two types, one that exhausts to the top. The former is the mainstream in racks equipped with information processing equipment whose degree of integration has increased.

One example will be described based on the conventional server room air conditioning system shown in FIG.
The server room 1 is lifted from the floor slab as a double floor by a post joist, etc., and a floor 2 that forms a walking surface by laying metal die-cast panels, a partition wall between the machine room, and a sheet parallel to the space between the rooms. The building is surrounded by the illustrated wall and the ceiling 3 and built in the building. On the floor 2, a plurality of racks 4 are installed on which information processing devices such as servers are mounted with the air intake surfaces for intake of air cooling of each information processing device aligned on the same vertical surface. A passage 5 is formed between rack rows formed by a plurality of racks 4 in which the intake surfaces face each other.
Under the floor 2, an underfloor space 6 is secured by being sandwiched between the upper surface of the floor slab, and a large number of power cables, mutual communication cables, and the like of each rack 4 are arranged and accommodated as rolling wiring. An air conditioner 7 is installed in the machine room outside the passage 5 on the same level as the floor 2. The air conditioner 7 takes in the air in the server room 1 as return air, cools it by a built-in cooling coil by sucking it from the suction port 7a at the upper part of the wall, and supplies air after cooling as a cooling air to the blower provided on the bottom surface. It sends out from the outlet 7b.

The lower blowing air conditioner used for the air conditioner 7 includes a filter, a cooling coil, and a blower, sucks high temperature air in the upper part of the server room 1 and blows out low temperature air below the floor. The air flow in the air conditioner is from top to bottom (vertical).
A perforated panel 8 is provided so that a part of the floor 2 is located in the passage 5, and cooling air sent from the air conditioner 7 is supplied onto the floor 2 through the perforated panel 8.
Each rack 4 has a plurality of information processing devices mounted on the same vertical surface with the intake surface for taking in air for cooling the air in the same vertical plane. Cooling air is processed from the entire front surface (intake surface 4b) of the housing 4a. The air is taken in by the cooling fan 4c included in the device and exhausted toward the back surface of the housing 4a. The intake surface 4b is often a punching plate having a high aperture ratio.

Next, the operation of the air conditioning system of FIG. 16 will be described.
The information processing device housed in the rack 4 operates without being turned off for 24 hours / day, although the power consumption, that is, the amount of heat generated varies depending on the amount of calculation processing. In order to remove the heat generated by the information processing device, the air conditioner 7 sends out cool air to be taken in by the cooling fan 4c of the information processing device. The cooling air that is the supply air delivered by the air conditioner 7 is supplied to the underfloor space 6 that communicates with the level directly above the machine room floor.
The cooling air supplied to the underfloor space 6 passes through the perforated panel 8 on the floor surface due to the delivery pressure of the air conditioner 7 blower, and passes through the intake surface 4b on the front surface of the rack 4 due to the suction pressure of the cooling fan 4c of the information processing equipment. As described above, the inside of the information processing device 9 in the housing 4a of the rack 4 is cooled.

  The cooling air sent into the housing 4a of the rack 4 cools the heat generated by the information processing device 9 in the housing 4a and raises the temperature of the cooling air 4c toward the rear surface of the rack 4. Released at. This released air is sucked into the suction port 7a at the upper part of the wall of the machine room by the suction pressure of the blower of the air conditioner 7 while forming a high temperature stratification under the ceiling of the server room 1, and the air conditioner 7 The temperature is adjusted by the cooling coil and blown again as cooling air. The air flow is indicated by arrows in FIG.

In the conventional air conditioning system shown in FIG. 16, for example, when the high load server 10 is mounted on the rack 4 as an information processing device, the amount of air generated by the cooling fan 4 c included in the high load server 10 is also large. However, if the amount of air sent from the air conditioner 7 is increased in accordance with the high load server 10 on the server room 1 side and air is blown from the perforated panel 8, the perforated panel 8 in the low load portion. The air volume at the outlet will also increase.
In the conventional air conditioning system shown in FIG. 16, air is supplied only from under the floor, but in the server room 1, the perforated panels 8 are provided in a dispersed manner in a plan view, and the non-perforated panel is installed. The air is blown through the underfloor space 6 partitioned by the raised floor where there is a lot of air leakage even at the site, and the blown wind speed at the perforated panel 8 in the central portion that is far from the machine room of the server room 1 is about 1 m / sec. In order to reduce the total supply amount of the blower of the air conditioner 7 to the server room 1 according to the load fluctuation, the information in the rack due to insufficient supply of air at the center of the server room 1 is necessary. It was not possible from the aspect of securing the indoor air supply air flow distribution for the purpose of avoiding the possibility of causing down of the processing equipment. In other words, conversely, even if the amount of air flow is increased, it can only be configured to increase the amount of air blown out from any perforated panel 8.

  Under such circumstances, since the cooling fan 4c of the high load server 10 has a large air volume, all the cold air blown from the perforated panel 8 of the nearby floor 2 is sucked into the high load server 10, but the low load In the information processing device 9 such as a server, the air flow of the cooling fan 4c is small, and the cool air blown out from the nearby perforated panel 8 and not sucked into the information processing device 9 directly forms a temperature stratification below the ceiling above. It will disturb the high-temperature return air layer. As a result, the high-temperature air to be returned to the machine room as return air at the upper part on the front side of the housing 4a in which the intake surfaces 4b of the plurality of information processing devices 9 of each rack 4 forming the cold aisle are aligned with the same vertical surface. May be disturbed and high-temperature return air may be introduced into the cold aisle by suction of the cooling fan 4c of the nearby information processing device 9.

In addition, the floor blow air-conditioning alone causes a temperature distribution on the height side also on the cold aisle side, and there is a high possibility that a temperature failure such as an increase in server suction temperature on the rack 4 upper side will occur.
In addition, as described above, in order to prevent the information processing equipment in the rack from being down due to insufficient air supply in the central part of the server room 1, the blow-up by the perforated panel 8 in the central part at a distance from the machine room of the server room 1 Since it is necessary to always secure the wind speed, it is necessary to use a large air volume floor blowout air conditioning at a low air supply temperature in accordance with the high load server 10, and each load considering the load size of the high load server and the low load server is taken into account. Excessive air flow and cooling load than the temperature difference and the amount of each cooling air flow) occurred, resulting in useless air conditioning (energy increase).

Further, it is necessary to ensure a predetermined value for the blown wind speed of the perforated panel 8 in the central portion, which is blown through the underfloor space 6 of the server room 1 and is far from the machine room, but depending on the calculation load on the server rack side. Since the perforated panel 8 cannot be changed according to the heat load change, or the resistance of the blown air volume cannot be changed, the distribution of the cold air becomes worse as the underfloor air volume increases, resulting in a high load. A large amount of air is also sent to a place where the server 10 is not installed and a large amount of air is unnecessary, and it is difficult to adjust the air volume of the perforated panel 8 which is a floor-installed outlet.
In order to increase the amount of air flow, most of the floor panels are already perforated panels 8 in the passage 5, but in order to further increase the number of perforated panels 8 as floor outlets, the width of the passage 5 is widened and the floor is increased. It is necessary to secure a space, that is, the space in which the rack 4 can be installed is reduced when viewed from the server room 1. The rack row installation area is reduced.

Therefore, the upper part of the entire front surface (the intake surface 4b) of the casing 4a between the racks 4 is attached with a capping shield 11 and capped (ie, chambered) on the cold aisle.
In addition, as shown in FIG. 17, installation of the perforated panel 8 of the air conditioning system of FIG. 16 is performed by installing a floor blowing fan 12 at the floor opening (floor outlet) and blowing in accordance with the high load server 10. It is also conceivable to take measures against increasing the air volume only by the high-load server 10 part in order to cope with the change in the arrangement and the resistance change in the blown air volume.

However, even in the vicinity of a low-load server where no high-load server 10 is installed, the blown wind speed of the perforated panel 8 is already 3 to 5 m / sec at the opening with an opening ratio of 50%, which is even faster. Since the blowout by the floor blowing fan 12 is different in direction from the blowing direction (horizontal direction) of the cooling fan 4c of the information processing device, and further increases the cold air velocity in the vertical direction from bottom to top, the high load server 10 Without increasing the amount of air sucked by the cooling fan 4c of the information processing device 9 or the like, the problem of blowing up the wind is generated.
Even with the precautionary measure for increasing the air volume, the cold air that has not been sucked into the information processing device 9 directly disturbs the high-temperature return air layer that forms the temperature stratification below the upper ceiling. That is, a part of the high-temperature air to be returned to the machine room as the return air is disturbed, and the high-temperature return air may be introduced into the cold aisle by the suction of the cooling fan 4 c of the nearby information processing device 9.

As described above, when the floor blowing fan 12 or the like is locally installed, the blowing wind speed increases, and it becomes difficult for the high load server 10 to properly suck in the conditioned air. For this reason, the capping shield 11 is installed on the top of the rack row for capping the cold aisle. However, the installation work of the capping shield 11 in the server room 1 that is in operation does not like hard disks and dust that hate vibration. This is difficult due to the characteristics of the information processing device 9.
Since server racks are owned by customers with security, it is difficult to take measures to attach something to the server rack body.
Therefore, in an existing air conditioning system that performs air conditioning of a room in which a rack that houses a server that draws cold air from one side and exhausts exhaust heat from the other, an air conditioner that cools air in the room including exhaust heat, and A hood device that is detachable with respect to a front portion of a rack that exists on the intake side of a heat generating device is known (for example, see Patent Document 1).

The hood apparatus of patent document 1 covers the front part of the rack, the hood apparatus in which the cold air cooled by the air conditioner flows inside the hood apparatus, and the cold air cooled by the air conditioner provided in the lower part of the hood apparatus. And a floor outlet from the bottom of the floor to the hood device. A floor blowing fan may be provided at the floor outlet as an air volume adjusting device.
Further, the space in the passage which is partitioned from the external space on the front side of the rack by a shield having a ceiling wall portion extending from the upper surface of the rack toward the passage side and a side wall portion extending from the ceiling wall portion toward the floor. (For example, refer to Patent Document 2).
In addition, it is known to provide an airflow adjustment member for controlling the airflow by the air conditioner by covering a space between other racks arranged at intervals (see, for example, Patent Document 3). .

In addition, it is installed between the racks in the room in which the server racks are arranged, and the air sucked from the indoor lower space (on the floor, not the underfloor space) is blown out in the upper space, so that it is in the indoor lower space. An air blower is known in which air having a lower temperature than that of return air is lifted and sucked into an information processing device at the top of a rack installed indoors (see, for example, Patent Document 4).
In addition, it is cold aisle / hot aisle air conditioning with the air supply space between the rack fronts of the racks facing each other and the exhaust space between the rack backs, and an air supply duct is installed in the ceiling space of the air supply space. Provide an exhaust duct in the ceiling space of the exhaust space, connect them with a blower fan, and provide a cooling panel facing the back of the rack of the rack. There is also a disclosure in which a plurality of fans are provided in a cooling panel on the opposite side of the rear face so that the exhaust flows through the cooling panel (see, for example, Patent Document 5).

JP2011-89716A JP 2011-106708 A JP 2009-282755 A JP 2005-172309 A JP 2011-27400 A

However, in the technologies described in Patent Document 1, Patent Document 2, and Patent Document 3, as described above, the server rack is owned by a customer with security, so there is no countermeasure for attaching something to the server rack body. The problem of difficulty is not solved.
Moreover, in Patent Document 1, the hood device is attached each time after the air conditioning system is constructed, and the operation becomes complicated.
Moreover, in patent document 2, the shield which has a ceiling wall part extended toward the channel | path side from the upper surface of the apparatus accommodation rack after construction of an air conditioning system, and a side wall part extended toward this floor from a ceiling wall part is provided. Thus, the operation becomes complicated.

  In Patent Document 4, the temperature gradient on the cold aisle side in the indoor height direction is reduced, that is, the conditioned air for cooling the rack in the lower part of the room is sent to the upper part by the blower, that is, the variation in the supply air temperature is reduced. The purpose is to keep the air volume in the cold aisle unchanged. The cold air supply to the cold aisle is only sent from the perforated panel on the floor. The cooling fan of the high load server has a large air flow, so all the cold air blown from the perforated panel in the nearby floor is sucked into the high load server, but the air flow of the cooling fan such as the low load server is small. The problem is that the cold air blown out from the perforated panel and not sucked into the information processing device will disturb the high-temperature return air layer that forms the temperature stratification below the ceiling above.

Further, since the blower sucks from the lower space and blows only to the upper space at a high speed, the cooling fan of the lower information processing device loses due to the suction force, and this time, there is a problem that the lower cooling cannot be performed successfully.
In addition, since the fan tower, which is a blower, is arranged in the rack row, the number of racks that can shorten signal cables by installing them close to each other is reduced, and it is necessary to pay attention to the handling of various cables in the underfloor space. And the installation area of the rack provided with information processing equipment such as a server is reduced.

Further, in Patent Document 5, a space sandwiched between opposite rack backs is defined as an exhaust space exhausted from the computer rack, and the exhaust space is provided as a cooling means facing the exhaust port on the back of the rack in the computer rack. The cooling panel is provided, and the air exhausted from the exhaust port of the computer rack to the exhaust space is cooled by passing through the cooling panel, which is different from the air conditioning system in which the exhaust is cooled by the air conditioner. The method is adopted.
As described above, in Patent Document 5, since heat generation processing (coil cooling) is performed in the vicinity of a rack where heat is generated, cooling is performed only with a panel installed locally, and redundancy is difficult to achieve (for example, There is a problem that backup cannot be performed at the time of failure and air conditioning at the time of failure is hindered).
Moreover, in FIG. 8 of patent document 5, there exists a possibility that it may become an obstruction of exhaust space by installation of a cooling panel.

  The present invention has been made in order to solve such conventional problems, and its purpose is to effectively use floor space accompanying the increase in load of information processing equipment, to secure rack installation space, due to temperature disturbance (such as wraparound). An object of the present invention is to provide an air conditioning system capable of avoiding a rise in suction temperature and reducing the amount of air blown.

The invention according to claim 1 includes two rows of racks that accommodate information processing devices, and the air intake surface side of each of the plurality of information processing devices is provided for each rack that is an information processing device that constitutes the two rows of racks. A plurality of racks are arranged in a rack row by aligning the intake surfaces, a passage that faces the intake surface side of the rack row is a cold aisle, and a passage that faces the exhaust surface side of the rack row is hot In an air conditioning system in which cooling air is blown into a chamber formed as an aisle to control the temperature of the information processing equipment, the rows of racks that suck air from the front and exhaust heat to the back are hot on the exhaust surface side of each other. A rack row group consisting of two rows arranged in parallel on the floor of the chamber with an aisle interposed therebetween, and the rack along the wall surface of the chamber in parallel with a cold aisle sandwiched between the intake surfaces of the rack row group The same height and width as And a front outlet unit that is arranged by connecting substantially frame-shaped frame structures made of steel plates with an open bottom surface and blows cooling air horizontally, and a floor slab and a raised floor under the floor of the chamber An underfloor space formed between the underfloor space, an underfloor air conditioner installed in the underfloor space, a suction chamber formed along the hot aisle under the hot aisle, the suction chamber and the underfloor air conditioner A duct communicating with a suction port of the machine, and an underfloor chamber communicating with the blowout port of the underfloor air conditioner and the front blowout unit, and the front blowout unit is substantially the same as the intake surface of each rack. Each of the air outlets having an end surface having a shape substantially the same shape as the air intake surface of the information processing device is provided with a fan installed in a horizontal direction. And facing the intake surface of each rack so that cooling air can be blown in the horizontal direction from the air outlet, which is an end surface having substantially the same shape as the intake surface of the plurality of information processing devices, toward the intake surface of each rack. By connecting the bottom surface of the frame structure to the underfloor chamber, the discharge pressure of the blower of the underfloor air conditioner from the blowout port that is the end surface substantially the same shape as the intake surface of the plurality of information processing devices Cooling air is blown toward the intake surface of each rack, and the underfloor air conditioner sucks exhaust air from the exhaust surface of each rack through the suction chamber and generates cooling air again to generate the underfloor chamber. It supplies to the said front blower outlet unit via.

The invention according to claim 2 is the air conditioning system of claim 1, wherein said front air outlet unit is characterized in that it comprises a flow rate adjusting mechanism.
According to a third aspect of the present invention, in the air conditioning system according to the second aspect , the air volume adjusting mechanism is configured by providing a damper at an opening on a bottom surface of the front outlet unit.
According to a fourth aspect of the present invention, in the air conditioning system according to the third aspect , the air volume adjusting mechanism is configured by adjusting an opening area of an opening on a bottom surface of the front outlet unit with a closing plate. To do.

The invention according to claim 5 is the air conditioning system according to any one of claims 1 to 4 , wherein the underfloor air conditioner is formed along a wall surface of the underfloor chamber by disposing a cooling coil and a blower in a casing. A part of the fan section is fitted into and attached to the plurality of mounting openings.
According to a sixth aspect of the present invention, in the air conditioning system according to any one of the first to fifth aspects, the underfloor chamber sends cooling air supplied from a blowout port of the underfloor air conditioner to the front blowout unit. It is divided by the panel standingly arranged from the said floor slab along the wall surface of the said underfloor space so that it can send in in the said front blower outlet unit from a bottom part opening part.

The invention according to claim 7 is characterized in that the air conditioning system according to any one of claims 1 to 6 is connected in parallel.

According to the present invention, the front air outlet unit blows the cooling air supplied from the underfloor chamber as a side flow toward the rack directly onto the intake surface on the front surface of the rack, and sends it through the intake surface into the rack casing. Air conditioning can be performed even when racks equipped with information processing equipment such as high-load servers are connected.
According to the present invention, the front air outlet unit blows the cooling air supplied from the underfloor chamber as a side flow toward the rack directly onto the air intake surface on the front surface of the rack, and sends the air through the air intake surface into the rack casing. The amount of side flow to be blown for each rack is easy to adjust, and the wind speed at the blowout outlet is not too high and unreasonable, like the perforated panel on the floor. Since the air is sent in the same direction of the wind direction without pressure, it is possible to avoid an increase in the suction temperature of the information processing device, and to prevent unnecessary air blowing and reduce the air blowing power.

According to the present invention, the front air outlet unit blows the cooling air supplied from the underfloor chamber as a side flow toward the rack directly onto the intake surface on the front surface of the rack, and sends it through the intake surface into the rack casing. Cold aisle capping measures are not required to forcibly change the direction of the cold intake air with different high-speed directions to the internal cooling air direction of the information processing equipment.
According to the present invention, it is not necessary to increase the passage width of the cold aisle / hot aisle for supplying air even if the installation ratio in the rack row of the high load rack is increased, and the floor plane space for server installation is effectively used. It becomes possible.

According to the present invention, when an external air conditioner for air conditioning of the entire room is provided in the server room, the temperature stratification of the high temperature return air is formed in the upper part of the room, and the high temperature return air is used as the external air conditioner. When returning to the rack suction surface, the air is blown from the side at a constant wind speed which is not high speed, so that the high temperature region of the upper temperature stratification can be blown without being disturbed.
According to the present invention, a new type of information processing device that can divide a room as a module, separates it from the next mounting zone, etc. at the time of building completion, and has a greatly different heat generation density from the previous mounting zone where conventional information processing devices are mounted. Can be partitioned from a module having a high-load rack row group, and efficient air conditioning is possible by setting the supply air temperature and the air volume according to each work section.
According to the present invention, since a plurality of underfloor air conditioners can be connected to the suction chamber and the underfloor chamber, the number of underfloor air conditioners can be increased according to the number of mounting racks in the indoor rack row on the floor. The initial cost can be reduced.

It is the schematic plan view which looked at the air conditioning system which concerns on 1st embodiment of this invention from the ceiling space side, and looked down at the room | chamber interior. 1 is a schematic plan view of an air conditioning system according to a first embodiment of the present invention as seen from an overhead view of a space under the floor. It is sectional drawing along the AA line of FIG. It is a schematic sectional side view which shows the state which pushes the cooling air from the tower type front blower outlet unit with a fan of the air conditioning system which concerns on 1st embodiment of this invention to a high load rack. It is a schematic sectional side view which shows the state which pushes the cooling air from the tower-type front blower outlet unit without a fan of the air conditioning system which concerns on 1st embodiment of this invention to a high load rack. 1 is a schematic plan view of an air conditioning system according to a first embodiment of the present invention as seen from an overhead view of a space under the floor. (A) Sectional drawing which shows the example which installed the damper in the tower type front surface outlet unit without a fan, (b) It is a perspective view of a damper. (A) Sectional drawing which shows the example which installed the damper in the tower type front surface outlet unit without a fan, (b) It is a perspective view of a damper. (A) It is sectional drawing which shows the example which installed the lower closing board in the tower type front surface outlet unit without a fan, (b) It is a perspective view of a lower closing board. It is the schematic plan view which looked at the room which looked down at the example which connected the air-conditioning system concerning a first embodiment of the present invention from the ceiling space side. It is the schematic plan view which looked at the air-conditioning system which concerns on 2nd embodiment of this invention from the ceiling space side, and looked down at the room | chamber interior. It is the schematic plan view which looked at the air-conditioning system which concerns on 2nd embodiment of this invention, removing the floor and overhead space. It is sectional drawing along CC line of FIG. It is the schematic plan view which looked at the air-conditioning system which concerns on 2nd embodiment of this invention, removing the floor and overhead space. It is the schematic plan view which looked at the room which looked down at the example which connected the air-conditioning system concerning a second embodiment of the present invention from the ceiling space side. It is a schematic sectional side view of the conventional air conditioning system. It is a schematic sectional side view of the conventional air conditioning system.

Hereinafter, the present invention will be described based on embodiments shown in the drawings.
1 to 5 show an example in which the air conditioning system according to the first embodiment of the present invention is applied to a server room 20.
The server room 20 is constructed as a room of a building surrounded by walls 31a to 31d, a ceiling 31e, and a floor slab 31f. On the floor slab 31f, a floor 30 is installed so as to constitute a double floor structure, for example, by laying a metal die-cast floor panel on a post and joists.
The wall 31c and the wall 31d are composed of, for example, an outer wall on the board-attached inner surface, a hallway or other use room, for example, a board-attached partition wall, etc., and the wall 31a and the wall 31b are steel plate sandwich panels that divide the server room for the same use. It is desirable that the wall be erected (hereinafter referred to as a panel).

On the floor 30, two rows of rack rows 42 are formed so as to connect a plurality of racks 41 and sandwich the passage 44. In each rack 41, a predetermined number of information processing devices 43 such as high load servers or low load servers are mounted on the intake surface 43a side and fans 43c attached to the information processing device 43 are mounted on the exhaust surface 43b side. The racks 41 are arranged in a rack row with the intake surfaces aligned. That is, the exhaust surfaces 43b are also arranged in a rack row, and the exhaust surfaces 43b are arranged facing the passage 44 side. The passage 44 is configured by laying a floor material such as a perforated die-cast floor panel or a grating on the floor 30 that serves as a floor suction port.
A plurality of tower-type front air outlet units 50 are erected from the floor 30 along the walls 31a and 31b so as to face the air intake surface 43a of the information processing device 43 which is a server or the like of the rack row group 42 in two rows. Arranged.

The tower-type front air outlet unit 50 includes a substantially rectangular parallelepiped frame made of steel and a frame structure 51 having a shape in which a steel plate is attached to the rack 41 so that the height and width of the rack 41 are equal.
The frame structure 51 includes a blower outlet 52a with a material having an infinite number of openings through which air passes, such as a punching plate or a net, on the front surface, a front surface 52 on the side facing the two rows of rack rows 42, and a top plate 53, a wall surface 54 positioned parallel to the walls 31a and 31b, and wall surfaces 55a and 55b arranged orthogonally to both ends of the front surface 52 and the top plate 53 via a frame, respectively, are formed. A bottom surface opening 56 a formed by removing the floor panel and the grating of the floor 30 below the bottom surface 56 is formed in the lower portion of the floor 30. It communicates with the underfloor chambers 32a and 32b. The wall surface 54 may be omitted by sharing the surface plates of the walls 31a and 31b.

A tower-type front air outlet unit 50 having a fan 59 includes a front surface 52 provided with air outlets 52a to which a material having innumerable openings for passing air such as a punching plate or a net is attached. A plurality of fans 59 are arranged horizontally and vertically along a plurality of bars (not shown) which are arranged so as to face each rack 41 and are supported by a steel framework inside 57 and located on the inner surface of the air outlet 52a. Install.
Under the floor 30 at the position of the tower-type front air outlet unit 50, the underfloor chambers 32a and 32b are provided with panels 33a and 33b that form wall surfaces in a plane integral area under the plane integration facing the outer contour of the continuous bottom opening 56a. It is formed by partitioning.

The panels 33a and 33b are erected from the floor slab 31f in parallel with the wall surface 54 of the underfloor space formed between the floor slab 31f and the floor 30, with a distance of the depth of the bottom opening 56a. Openings 33c and 33d, which are respectively mounted so as to fit the fan section casing of the underfloor air conditioner 34, are opened at predetermined positions. Further, each end side of the panels 33a and 33b is bent so as to be orthogonal to the wall surface 54 along the outer contour of the continuous bottom surface opening 56a so that the vertical end of the panel abuts on the underfloor region of the wall surface 54. Installed.
The underfloor air conditioner 34 includes a cooling coil and a blower as essential elements, and preferably includes a filter. The underfloor air conditioner 34 is installed on the underfloor floor slab 31f together with, for example, a steel base. The underfloor air conditioner 34 passes through a carry-in path below a suction chamber 35 described later, and is adjusted according to the progress of mounting the rack row group 42 on the floor. The number of departments can be added later.

The underfloor air conditioner 34 is installed by fitting a part of the fan section into the openings 33c and 33d of the underfloor chambers 32a and 32b and filling the gap with a filler. If the rack row group 42 that is the load on the floor is small at the start of the operation of the initial server room 20, the underfloor air conditioner 34 is also installed and operated in accordance with that. The openings 33c and 33d of the underfloor chambers 32a and 32b that are not mounted are closed by panel covers of the same size.
The cold air outlet 34a of the underfloor air conditioner 34 communicates with the underfloor chambers 32a and 32b, respectively.
The return air suction port (section) 34b of the underfloor air conditioner 34 has a floor portion located below the floor slab 31f in the underfloor area facing the passage 44 in plan view at a level farther from the floor slab 31f than the height of the underfloor air conditioner 34. It is supported by a steel material from the slab 31f, has a floor 30 on the open upper surface, and communicates with a suction chamber 35 formed by blocking five surfaces with a panel and partitioning into a box 36.

A box 36 with a bottom that forms the suction chamber 35 has two side surfaces that are arranged to extend under the floor along the back surface of the passage 44 that is a hot aisle formed between two rows of rack rows 42. Panels 36a, 36b, two end panels 36c, 36d attached perpendicularly to both ends of the two side panels 36a, 36b, i.e., extending under the floor along the end of the passage 44, and two side surfaces The panels 36a, 36b are located on the bottom surfaces formed by the lower ends of the two end surface panels 36c, 36d, and are composed of a bottom panel 36e supported from the floor slab 31f. The bottom panel 36e includes each under-floor air conditioner 34. An opening 36g which is a return air outlet communicating with the return air suction port 34b through a short duct 36f is formed.
The space between the underfloor chambers 32a and 32b and the suction chamber 35 is a cable rack wiring from the UPS (uninterruptible power supply) to the server room 20 and a housing space 37 for the heat medium piping to the air conditioner.

Next, the operation of the air conditioning system according to this embodiment will be described.
In each rack 41 of the rack row group 42, there is an information processing device 43 that is a high load server or a low load server, a router, a gateway, a network device that is a peripheral device of the server, or the like. The exhaust surface 43b from the cooling fan 43c of each information processing device 43 is mounted on the same basis every time, and the rack row group 42 is configured to exhaust the exhaust toward the passage 44 side. However, the total exhaust air volume differs for each rack 41 depending on the information processing equipment to be mounted.

During operation of a certain rack 41, the fan 59 in the corresponding tower-type front air outlet unit 50 is operated, the corresponding underfloor air conditioner 34 is operated, and the cooling that is temperature-controlled from the underfloor air conditioner 34 is sent out. The working air is supplied to the corresponding underfloor chamber 32a or 32b.
The cooling air supplied to the underfloor chamber 32a or 33b passes through the bottom surface opening 56a of the floor surface due to the blowing pressure of the underfloor air conditioner 34 and the suction pressure of the fan 59, and as shown in FIG. A side flow toward the rack 41 is formed from the outlet 52a of the outlet unit 50 to which a material having innumerable openings through which air passes is pasted. The wind speed of the side flow toward the rack 41 from the tower-type front air outlet unit 50 corresponding to each rack 41 is higher than the wind speed obtained by dividing the total air volume of the cooling fan 43c of the information processing device 43 of the rack 41 by the area in front of the rack. Generated by fan 59 to be slightly faster.

The side flow of the cooling air is blown directly onto the air intake surface 43a on the front surface of the rack 41, passes through the air intake surface 43a by the conveying force of the cooling fan 43c of the information processing device 43 while maintaining the air direction as it is, and is It is sent inside the information processing device 43 inside the body. The cooling air sent to the inside of each information processing device 43 in the housing of the rack 41 cools the part that generates heat by the calculation of the information processing device 43 such as a server, as shown in FIG. 1, FIG. 3, and FIG. At the same time, the exhaust becomes high temperature and is discharged from the discharge side of the cooling fan 43 c toward the back of the rack 41. Since the racks 41 constituting the two rows of rack rows 42 are facing each other with the back direction aligned as described above, a hot aisle is formed in the passage 44 between the two rows of rack rows 42.
As shown in FIGS. 2 to 4, the discharged high-temperature exhaust gas passes through a suction chamber 35 provided under the floor of the passage 44, returns from the return air opening 36 g to the return of each under-floor air conditioner 34 through a duct 36 f. The air is sucked into the air conditioner 34 through the air suction port 34b and reaches the cooling coil.
Then, the temperature is again adjusted to the cooling air and blown out from the cold air outlet 34a to the underfloor chamber 32a or 32b.

According to the present embodiment, the tower-type front air outlet unit 50 blows the cooling air supplied from the underfloor chambers 32a and 32b directly onto the intake surface 43a on the front surface of the rack 41 as a side flow toward the rack 41, Since it passes through the surface 43a and is fed into the housing of the rack 41, an increase in the suction temperature of the server 43, in particular, a temperature failure of the rack 41 or the like can be avoided.
Therefore, there is no need for capping (which covers the top plate of the two server rack rows that face the suction surface and make the server rack cold air suction surface and passage section into a chamber), which is indispensable for conventional high load servers. It becomes.
Further, when the racks 41 on which the high load servers are mounted are sparsely arranged inside the server rack row group 42, the high load servers are mounted on the high load servers using the cooling air as a side flow. On the front surface of the rack 41, the wind speed is slightly higher than the wind speed obtained by dividing the total air volume of the cooling fan 43c of the information processing device 43 of the rack 41 by the rack intake area, that is, the air volume is larger than that of the surrounding rack 41 mounted with the low-load server Therefore, the cooling air required by each rack 41 can be finely and finely supplied without excess and deficiency, and the high load server can be efficiently cooled.

Further, when the racks 41 on which the high load servers are mounted are arranged independently or sparsely and continuously, the cooling air is used as a side flow for the high load servers, and the racks 41 on which the high load servers are mounted. Since the wind speed slightly higher than the wind speed obtained by dividing the total air volume of the cooling fan 43c of the information processing device 43 of the rack 41 by the rack intake area, that is, the air volume required by the rack 41, is blown to the front surface. Even in the initial stage of operation of the server room 20 that is singly or in a small number of continuous implementations, the required cooling air can be supplied finely without excess or deficiency, and a high-load server can be efficiently cooled.
Further, since the path from the underfloor air conditioner 34 to each rack 41 via the front outlet unit 50 is independent so as to be able to be supplied at an appropriate wind speed, the rack 41 in which the high load information processing device is mounted has a low temperature. Although air is supplied at (for example, 18 ° C.), the supply air temperature setting can be changed so that the rack 41 on which the low-load information processing device 43 is mounted is supplied at a high temperature. As a result, the evaporation temperature of the refrigeration cycle in the heat source of the air conditioning system must be reduced according to the supply air temperature, but if the refrigeration system is divided according to each supply air temperature, the evaporation temperature of the heat source refrigeration cycle Can be changed for each system, the coefficient of performance (COP) of the integrated refrigeration cycle can be improved, and air conditioning energy can be saved.

  Further, according to the present embodiment, for example, as shown in FIG. 4, the cold air supply portion by the side flow of the cold aisle and the high temperature that is thermally connected to the hot aisle due to the difficulty of air movement and becomes a heat reservoir in the upper part. Although temperature stratification is formed with air, by blowing the air amount slightly faster than the air velocity obtained by dividing the total air volume of the cooling fan 43c of the information processing device 43 of the rack 41 by the rack intake area to the front surface of the rack 41, It does not disturb the hot air layer at the top of the room, and the cold aisle is slightly positive pressure, so it does not disturb the temperature stratification, that is, it prevents the short circuit that entangles the hot air from the heat pool in the upper part of the room. be able to.

In the present embodiment, the air conditioner 34 is controlled by the load of the server 43 or the suction surface temperature so that the air volume of the air conditioner 34 is variable, and the air volume from the front air outlet of the tower-type front air outlet unit 50 is variable. Therefore, a tower-type front air outlet unit is provided so that appropriate cold air is directly blown only to the rack 41 on which the high load server is mounted, and unnecessary cold air is not sent to the rack 41 on which the low load server is mounted. 50 fans 59 can be operated, which saves energy.
In the present embodiment, the case where all the servers 43 are mounted in all the racks 41 of the two rows of server racks 42 has been described. However, the present invention is not limited to this, and the rack 41 in which the servers 43 are not mounted. If there is a rack 41, the rack 43 on which the server 43 is mounted without sealing the openings 33c and 33d without arranging the air conditioner 34 below the floor 30 of the tower-type front outlet unit 50 facing the rack 41. Cooling air is supplied to 41 from a tower-type front air outlet unit 50.

Therefore, after that, when the server 43 is mounted on the rack 41 that has not been used, the air conditioner 43 is installed corresponding to the rack 41.
In the air conditioning system according to the present embodiment, for example, an air volume adjusting mechanism is provided in the floor opening 56a on the floor surface, and the air volume from the front air outlet of the tower-type front air outlet unit 50 can be made variable.
Moreover, although this embodiment demonstrated the case where the fan 59 was installed in the tower type front blower outlet unit 50, this invention is not limited to this, For example, as shown in FIG. It can also be used in the front blowout unit 50 of the mold.

In that case, for example, as shown in FIG. 6, in the underfloor chambers 32a and 32b, the front surface 52 and the front surface 52 of the front air outlet unit 50 are provided for each bottom opening 56a below the floor 30 at the position of the tower type front air outlet unit 50. There are wall surfaces 55a and 55b arranged orthogonal to both ends of the top plate 53. The upper surfaces of the wall surfaces 55a and 55b are in contact with each other, and a punching plate 60 serving as ventilation resistance is erected from the floor slab at the lower part of the floor. Provide.
Thereby, when the racks 41 on which the high load servers are mounted are sparsely arranged independently or with few continuous, the racks 41 on which the high load servers are mounted using the cooling air as a side flow for the high load servers. Is blown to the front side of the rack 41 by a wind speed slightly higher than the wind speed obtained by dividing the total air volume of the cooling fan 43c of the information processing device 43 of the rack 41 by the rack intake area, that is, the air volume required by the rack 41. A side flow can be supplied from the adjacent tower-type front air outlet unit 50 through the plate 60 with a small air volume as the air-conditioning air volume of the room where the rack 41 is not installed.

Further, even when the racks 41 on which high-load servers are mounted continuously form a rack row group 42, even if one of the corresponding underfloor air conditioners 34 is stopped down, the underfloor air conditioners 34 adjacent to both sides are disposed. By increasing the air volume and supplying the air through the punching plate 60, backup can be achieved.
In order to adjust the air volume from the air outlet 52a of the tower-type front air outlet unit 50, for example, an air volume adjusting mechanism is provided as shown in FIGS.

FIG. 7 shows an example in which the damper 61 is provided in the bottom surface opening 56a of the floor surface. For example, the damper 61 pivotally supports a plurality of damper plates 62 on the frame 63 and adjusts the air volume by opening / closing or tilting the damper plates 62 with a movable device (not shown).
In FIG. 8, the floor opening 56a on the floor surface is closed and the opening area of the bottom surface opening 56a on the floor surface is adjusted by the plate 64 to adjust the air volume.
In FIG. 9, a closing plate 65 is attached inside the wall surface 52 of the tower-type front air outlet unit 50 to adjust the opening area of the air outlet 52a to adjust the air volume.

In the air conditioning system according to the first embodiment of the present invention, the example applied to one server room 20 is shown. However, the present invention is not limited to this, and for example, as shown in FIG. You may arrange in parallel.
In other words, in the present invention, the server room 20 that has completed air conditioning can be connected to a module by connecting an area of a certain scale.
As described above, the air conditioning system according to the first embodiment is applied when the floor is high and the floor height is high enough for an operator to stand and work.

11 to 13 show an air conditioning system according to a second embodiment of the present invention.
This embodiment is applied when the floor is low and a space where an operator can stand and work cannot be formed.
In the present embodiment, the air conditioner 34A is a low floor installation type underfloor air conditioner, and air conditioners (AHU) 34B are installed in the air conditioner machine rooms arranged at both ends of the server room 20A, and air conditioning is performed instead of the suction chamber 35. It differs from the air-conditioning system concerning a first embodiment by the point which installed 35A of return air inlets for every machine 34A. In addition, about the component same as 1st embodiment, the same code | symbol is attached | subjected and detailed description is abbreviate | omitted.

The air conditioner 34A includes a filter, a cooling coil, and a blower. Since the air conditioner 34A is installed under a low floor type floor, its capacity is inferior to that of the air conditioner 34. The shortage is supplemented by an air conditioner (AHU) 34B.
In the present embodiment, an air conditioner (AHU) 34B is installed in the air conditioning machine room 21 omitted in FIG.
The cooling air supplied from the air conditioner (AHU) 34B is guided to the underfloor chambers 32a and 32b by the panels 65a, 65b, 65c, and 65d connected to both ends of the panels 33a and 33b.
The return air suction port 35A is connected to the air suction port 34b of each air conditioner 34A by a nonflammable canvas joint 66 that connects the lower portion of the passage 44 and the air suction port 34b of each air conditioner 34A.

Next, the operation of the air conditioning system according to this embodiment will be described.
During operation of the server 43, the fan 59 in the tower-type front air outlet unit 50 is operated and the air conditioner 34A is operated, and cooling air sent from the air conditioner 34A is supplied to the underfloor chambers 32a and 32b.
The cooling air supplied to the underfloor chambers 32a and 32b receives the blowing pressure of the air conditioner 34A and the suction pressure of the fan 59, passes through the bottom surface opening 56a of the floor surface, and as shown in FIG. A side flow toward the rack 41 is formed from the air outlet 52a formed of countless openings of the air outlet unit 50. A cold aisle is formed between the tower-type front air outlet unit 50 and the rack 41. The wind speed of the side flow from the blower outlet 52a consisting of countless openings of the tower-type front blower outlet unit 50 toward the rack 41 is slightly higher than the wind speed sucked into the air conditioner 34 from the air inlet 34b of the air conditioner 34A. Generated by the fan 59.

The side flow of the cooling air is directly blown to the intake surface 43a on the front surface of the rack 41, and is sent into the housing of the rack 41 through the intake surface 43a. The cooling air sent into the housing of the rack 41 cools the server 43 in the housing, and is discharged in the rear direction as high-temperature exhaust as shown in FIGS. A hot aisle is formed between the two rack row groups 42.
As shown in FIGS. 11 to 13, the discharged air passes through a plurality of return air suction ports 35 </ b> A provided under the floor of the passage 44, and the air suction of each air conditioner 34 from the opening 36 f through the duct 36 g. It is sucked into the air conditioner 34 through the mouth 34b. In this example, since a plurality of return air suction ports 35A are provided instead of the suction chamber 35 of FIG. 2, high-temperature exhaust gas is sucked from the respective return air suction ports 35A.
Then, it becomes cooling air again and is blown out to the underfloor chambers 32a and 32b.

  In the second embodiment, the air conditioner 34A is installed on the floor slab 31f under the floor together with, for example, a steel base, as in the first embodiment, but it is difficult to secure a carry-in route in the underfloor space. In this case, the floor panel of the future installation space where the rack row 42 in the server room 20A is not installed is removed and the air conditioner is moved to the underfloor space. Installation is possible by inserting 34A and horizontally moving it with a roller or the like before fitting a part of the fan section into any of the openings 33c and 33d of the last underfloor chambers 32a and 32b. If the rack row group 42, which is a load on the floor, is small when the server room 20 is initially operated, only a part of the total number of the air conditioners 34A is mounted and operated accordingly. The openings 33c and 33d of the underfloor chambers 32a and 32b that are not mounted are closed by panel covers of the same size. Further, the return air is sucked into the air conditioner 34A through the campus joint 36g via the return air suction port 35A through the perforated floor panel of the floor surface, but the air conditioner 34A portion not mounted is disposed on the floor surface. Replace with a non-porous panel and close it.

Also in this embodiment, the same operational effects as in the first embodiment can be achieved.
In the air conditioning system according to the present embodiment, as in the first embodiment, for example, an air volume adjusting mechanism is provided in the floor opening 56a on the floor surface, and the air volume from the front air outlet of the tower-type front air outlet unit 50 is adjusted. It can be variable.
Moreover, although this embodiment demonstrated the case where the fan 59 was installed in the tower type front surface outlet unit 50, this invention is not restricted to this, For example, as shown in FIG. In addition, a tower-type front air outlet unit 50 without a fan 59 can also be used.

In this case, for example, as shown in FIG. 14, a punching plate 60A that provides ventilation resistance is provided in each of the air conditioners 34A in the underfloor chambers 32a and 32b, and the air outlet of the tower-type front air outlet unit 50 according to the server load. The air volume from 52a can be adjusted.
Further, in order to adjust the air volume from the air outlet 52a of the tower-type front air outlet unit 50, an air volume adjusting mechanism is provided, for example, as shown in FIGS.
FIG. 7 shows an example in which the damper 61 is provided in the bottom surface opening 56a of the floor surface. For example, the damper 61 pivotally supports a plurality of damper plates 62 on the frame 63 and adjusts the air volume by opening / closing or tilting the damper plates 62 with a movable device (not shown).
In FIG. 8, the floor opening 56a on the floor surface is closed and the opening area of the bottom surface opening 56a on the floor surface is adjusted by the plate 64 to adjust the air volume.
In FIG. 9, a closing plate 65 is attached inside the wall surface 52 of the tower-type front air outlet unit 50 to adjust the opening area of the air outlet 52a to adjust the air volume.

In the air conditioning system according to the second embodiment of the present invention, the example applied to one server room 20A is shown. However, the present invention is not limited to this, and as in the first embodiment, for example, as shown in FIG. In addition, three server rooms 20A may be arranged in parallel.
In other words, according to the present invention, it is possible to make a module compatible by connecting the server room 20A in which air conditioning is completed with an area of a certain scale.

20, 20A Server room 21 Air conditioning machine room 30 Floor 32a, 32b Underfloor chamber 33a, 33b Panel 33c, 33d Opening 34, 34A, 34B Air conditioner 34a Cold air outlet 34b of air conditioner 34 Air inlet 35 of air conditioner 34 Suction chamber 35A Return air inlet 36 Box-shaped panel with bottom 36f Duct 36g Opening 37 Accommodating space 41 Rack 42 Rack row group 43 Server 43a Intake surface 43b Exhaust surface 44 Passage 50 Tower-type front outlet unit 51 Frame structure 52, 54 , 55a, 55b Wall 52a Outlet 53 Ceiling 56 Bottom 56a Opening 59 Fan 60 Punching plate 61 Damper 62 Damper plates 64, 65 Closing plate 66 Campus joint

Claims (7)

It is composed of two rows of racks that accommodate information processing devices, and each of the racks, which are information processing devices constituting the two rows of racks, is mounted with the intake surface side of each of the plurality of information processing devices aligned. In a chamber formed as a rack row with the intake surfaces aligned, a passage that faces the intake surface side of the rack row is a cold aisle, and a passage that faces the exhaust surface side of the rack row is a hot aisle, In the air conditioning system for managing the temperature of the information processing device by blowing cooling air,
A rack row group consisting of two rows in which the rows of racks that inhale from the front and exhaust heat to the back are arranged in parallel on the floor of the chamber with the hot exhaust on the side of each exhaust surface;
A substantially rectangular parallelepiped frame structure made of a steel plate having the same height and width as the rack along the wall surface of the chamber in parallel with the cold aisle on the intake surface side of the rack row group and having an open bottom surface A front air outlet unit that is arranged by connecting the air and blows out the cooling air in the horizontal direction,
An underfloor space formed between a floor slab and a raised floor under the floor of the chamber;
An underfloor air conditioner installed in the underfloor space;
A suction chamber formed along the hot aisle under the hot aisle floor;
A duct communicating the suction chamber and the suction port of the underfloor air conditioner;
An underfloor chamber connecting the air outlet of the underfloor air conditioner and the front air outlet unit;
The front outlet unit is
An end face that is substantially the same shape as the air intake surface of each rack is formed by a plurality of air outlets, and each air outlet that forms an end surface that is substantially the same shape as the air intake surface of the information processing device is blown horizontally. Each having a fan installed so that the cooling air can be blown in a horizontal direction from a blowout port which is an end surface having substantially the same shape as an intake surface of the plurality of information processing devices toward the intake surface of each rack, Arranged to face the intake surface of each rack,
By connecting the bottom surface of the frame structure to an underfloor chamber, the air intake of each rack is caused by the discharge pressure of the blower of the underfloor air conditioner from the air outlet, which is an end surface having substantially the same shape as the intake surface of the plurality of information processing devices. Blow cooling air toward the surface,
The underfloor air conditioner sucks exhaust from the exhaust surface of each rack through the suction chamber, generates cooling air again, and supplies it to the front outlet unit through the underfloor chamber. Air conditioning system. The air conditioning system according to claim 1, wherein
The front air outlet unit includes an air volume adjusting mechanism . In the air conditioning system according to claim 2 ,
The air volume adjusting mechanism is configured by providing a damper at an opening on a bottom surface of the front air outlet unit . In the air conditioning system according to claim 3,
The said air volume adjustment mechanism is comprised by adjusting the opening area of opening of the bottom face of the said front blower outlet unit with a block board . The air conditioning system characterized by the above-mentioned. The air conditioning system according to any one of claims 1 to 4,
The underfloor air conditioner includes a cooling coil and a blower disposed in a casing, and a plurality of mounting openings formed along a wall surface of the underfloor chamber are fitted with a part of a fan section. Air conditioning system. The air conditioning system according to any one of claims 1 to 5,
The underfloor chamber is arranged along a wall surface of the underfloor space so that cooling air supplied from an outlet of the underfloor air conditioner can be fed into the front outlet unit from a bottom opening of the front outlet unit. The air conditioning system is partitioned by a panel arranged upright from the floor slab . An air conditioning system, wherein the air conditioning system according to any one of claims 1 to 6 is connected in parallel .

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