JP6129618B2 - 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.

Information processing equipment such as servers, routers, gateways, and network devices that are peripheral equipment for servers, such as data center server rooms installed in rack-like containers, or advanced communication equipment are also rack-like containers. In a communication electronic equipment installation room installed in a computer room or a computer room equipped with a high-performance supercomputer capable of high-speed calculation, information processing equipment Heat generation has increased, and information processing equipment has been increasingly integrated due to the downsizing of information processing equipment, and the heat generation load per indoor flat area has increased.
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: an MPU chip having a CPU function, require a large amount of power for calculation and therefore generate a great deal of heat. Since it is necessary to maintain a constant 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 hot air in the upper part of the server room 1, and blows out cold air under 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 is equipped with a plurality of information processing devices 9 and 10 with the intake surface for taking in air for cooling the air in the same vertical plane, and cooling air is supplied from the entire front surface (intake surface 4b) of the housing 4a. Then, the air is taken in by the cooling fan 4c included in the information processing device and exhausted toward the back of the casing.

Next, the operation of the air conditioning system of FIG. 14 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 devices 9 and 10, the air conditioning device 7 sends out cool air to be taken in by the cooling fan 4 c of the information processing devices 9 and 10. 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 sending pressure of the air conditioner 7 blower, and on the front surface of the rack 4 due to the suction pressure of the cooling fan 4 c of the information processing devices 9 and 10. The inside of the information processing devices 9 and 10 in the housing of the rack 4 is cooled through the intake surface 4b (which is often a punching plate having a high aperture ratio).

  The cooling air sent into the casing 4a of the rack 4 cools the heat generated by the information processing devices 9 and 10 in the casing 4a, raises its own temperature, and sends the cooling fan 4c toward the back of the rack 4. Released with pressure. This released air is sucked into the return air 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 3 of the server room 1, and the air conditioner The temperature is adjusted by the cooling coil of the device 7 and blown again as cooling air. The flow of air is indicated by arrows in FIG.

In the conventional air conditioning system shown in FIG. 14, for example, when a high load server is mounted on the rack 4 as the information processing device 10, the air flow rate of the cooling fan 4 c included in the information processing device 10 that is the high load server is Although the amount of heat generation has increased, the amount of air sent from the air conditioner 7 is increased in accordance with the information processing device 10 that is a high load server on the server room side, and air is blown from the perforated panel 8. Then, the air volume at the outlet of the low load portion also increases.
In the conventional air conditioning system shown in FIG. 14, the 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. Even in the part, the air is blown through the underfloor space partitioned by the raised floor where there is a lot of air leakage, 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. It is necessary to always ensure that reducing the total supply amount of the air conditioner 7 blower to the server room 1 according to the load fluctuation is an information processing device in the rack due to insufficient supply at the center of the server room 1 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 downtime. 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, the cooling fan 4c of the information processing apparatus 10 that is a high-load server has a large air volume, so that all the cool air blown from the perforated panel 8 of the nearby floor 2 is information that is a high-load server. Although the information processing device 9 such as a low-load server has a small air volume in the information processing device 9 such as a low-load server, the cool air blown out from the nearby perforated panel 8 and not sucked into the information processing device 9 remains as it is. The high-temperature return air layer that forms the temperature stratification below the ceiling of the roof is disturbed. As a result, one of 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 of the plurality of information processing devices of each rack 4 forming the cold aisle are aligned with the same vertical surface. The parts may be disturbed and high-temperature return air may be introduced into the cold aisle by the 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 upper side will occur.
In addition, as described above, it is necessary to always ensure the blowing air speed at the perforated panel 8 in the central portion at a distance from the machine room of the server room 1 (in the rack due to insufficient air supply in the central part of the server room 1). From the prevention of downtime of information processing equipment, it is necessary to use a large air volume floor blowout air conditioning at a low air supply temperature that matches the information processing equipment 10 that is a high load server. Excessive air flow and cooling load were generated compared to the temperature differences and the cooling air flow in consideration of the load on the server, resulting in useless air conditioning (energy increase).

Further, although it is necessary to secure a predetermined value for the blown air velocity of the perforated panel 8 at the center part which is blown through the under floor space of the server room 1 and is far from the machine room, the heat generated by the computation load on the server rack side Since the perforated panel 8 cannot be changed according to the load change and the resistance of the blown air volume cannot be changed, the distribution of the cold air becomes worse as the underfloor air volume increases, and the high load server A large amount of air is also sent to a place where a large air volume is not installed, and it is difficult to adjust the air volume of the perforated panel 8 which is a floor 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 air supply 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.
Further, as shown in FIG. 15, in accordance with the information processing device 10 which is a high load server, a floor blowing fan 12 is installed at the floor opening (floor outlet) and blows air, so that the hole of the air conditioning system in FIG. It is also conceivable to deal with the change in the arrangement of the perforated panel 8 and the change in the resistance of the blown air volume as a countermeasure for increasing the air volume only in the information processing device 10 portion which is a high load server.

However, even in the vicinity of a low-load server where the information processing device 10 which is a high-load server is not installed, the blowout wind speed of the perforated panel 8 is already 3 to 5 m / sec at the opening with an opening ratio of 50%. The air blowing by the floor blowing fan 12 that makes it faster is different in direction from the air blowing direction (horizontal direction) of the cooling fan 4c of the information processing equipment 9, 10, and further increases the vertical cold air velocity from the bottom to the top. Therefore, the problem of the blow-up of the upward air is generated without increasing the amount of air sucked by the cooling fan 4c of the information processing device 10 or the like that is a high-load server.
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 information processing apparatus 10 that is a high-load server 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. Difficult due to characteristics of information processing equipment.
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. Is known (see, for example, 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).

Also, it is installed between the racks in the room where the server racks are arranged, and the air sucked from the indoor lower space (on the floor that is not the under floor space) is blown out in the upper space, compared with the return air. There is known a blower in which air in a lower space of a low-temperature room is lifted and sucked into an information processing device in an upper part of a rack installed in the room (for example, see 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, failure) Sometimes cannot be backed up, hindering air conditioning in the event of a failure).
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 a rack row group that is two rows of rack rows that accommodate information processing devices, and the air intake surface side of each information processing device is aligned for each rack that constitutes the two rows of rack rows. A plurality of racks are aligned with the intake surfaces to form a rack row, 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 controlling the temperature of the information processing device by blowing cooling air into the formed chamber, the rack row that sucks air from the front and exhausts heat to the back is arranged on the two intake surfaces with the two cold surfaces. A rack row group arranged in parallel on the floor of the chamber with an aisle passage interposed therebetween, and an air passage side of the cold aisle on the intake surface side of the rack row group and standing on the floor surface of the chamber in parallel. Cooling air A front air outlet unit that blows out the air horizontally and a shaft between the ceiling and floor slab of the chamber along the wall surface of the chamber in parallel with the hot aisle passage on the exhaust surface side of the rack row group A suction unit having innumerable suction ports for passing air to the exhaust surface side of the rack row group, an underfloor space formed between a floor slab and a floor under the floor of the chamber, and installed in the underfloor space And an underfloor air conditioner whose own return air inlet is connected to the suction unit via a short duct, and the underfloor space with the front outlet unit sandwiched between two cold aisle passages. A blower chamber that is formed by standing a panel along the planar contour, is connected to a discharge port of the underfloor air conditioner, and communicates with a bottom surface of the front blowout unit that is open to the floor surface, Front outlet The knit includes a plurality of air outlets whose end surfaces are substantially the same as the air intake surfaces of the racks, and the cooling air can be blown horizontally from the air outlets toward the air intake surfaces of the racks. The cooling air is blown from the plurality of air outlets toward the air intake surface of each rack, and the underfloor air conditioner is connected to the air intake surface of each rack. Exhaust gas is sucked in through the suction unit, cooling air is generated again, and is supplied to the front outlet unit through the outlet chamber.

The invention according to claim 2 includes a rack row group which is a two-row rack row that accommodates information processing devices, and the air intake surface side of each information processing device is aligned for each rack constituting the two rows of rack rows. A plurality of racks are aligned with the intake surfaces to form a rack row, 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 controlling the temperature of the information processing device by blowing cooling air into the formed chamber, the rack row that sucks air from the front and exhausts heat to the back is arranged on the two intake surfaces with the two cold surfaces. A rack row group arranged in parallel on the floor of the chamber with an aisle passage interposed therebetween, and an air passage side of the cold aisle on the intake surface side of the rack row group and standing on the floor surface of the chamber in parallel. Cooling air A front air outlet unit that blows out the air horizontally and a shaft between the ceiling and floor slab of the chamber along the wall surface of the chamber in parallel with the hot aisle passage on the exhaust surface side of the rack row group Is formed between the floor slab and the floor under the floor of the chamber, and connected to the discharge port of the underfloor air conditioner. the underfloor space together with the floor of the front air outlet unit and the underfloor space that passes with the opened bottom, are connected return air inlet of itself to the suction unit is installed in the underfloor space via a short duct It is arranged in an underfloor air conditioner that communicates with the discharge port and an air conditioner room adjacent to the room, communicates with the room via a return air port provided in the upper part of the wall of the room with the air conditioner room. Outlet is externally connected to the space under the floor The front air outlet unit includes a plurality of air outlets whose end surfaces are substantially the same as the air intake surfaces of the racks, and are directed from the air outlets toward the air intake surfaces of the racks. The cooling air is arranged so as to face the intake surface of each rack so that the cooling air can be blown in the horizontal direction, and the cooling air is blown from the plurality of air outlets toward the intake surface of each rack. Is characterized in that exhaust from the exhaust surface of each rack is sucked through the suction unit, cooling air is generated again, and is supplied to the front outlet unit through the underfloor space .

The invention according to claim 3 is the air conditioning system according to claim 1 or claim 2, wherein the front outlet unit has a substantially rectangular parallelepiped shape made of a steel plate having the same height and width as the rack and having an open bottom. It is characterized in that it is constructed by concatenating the frame structures.
According to a fourth aspect of the present invention, in the air conditioning system according to any one of the first to third aspects, the front air outlet unit is horizontally arranged at an air outlet that is an end surface having substantially the same shape as the air intake surface of the rack. It is characterized by having a fan installed to blow out.
The invention according to claim 5 is the air conditioning system according to any one of claims 1 to 3, wherein the front outlet unit is not provided with a fan.

According to a sixth aspect of the present invention, in the air conditioning system according to the fifth aspect, the front outlet unit includes an air volume adjusting mechanism.
The invention according to claim 7 is the air conditioning system according to claim 6, wherein the air volume adjusting mechanism is configured by providing a damper at an opening of a bottom surface of the front air outlet unit.
The invention according to claim 8 is the air conditioning system according to claim 6, wherein the air volume adjusting mechanism is configured by adjusting an opening area of an opening on a bottom surface of the front air outlet unit with a closing plate. To do.

The invention according to claim 9 is the air conditioning system according to claim 1, wherein the underfloor air conditioner has a cooling coil and a blower disposed in a casing, and an air conditioner in which a lid wall that is a part of a wall surface of the blowout chamber is removed. A part of the fan section is fitted into and installed in the machine opening.
The invention according to claim 10, the air-conditioning system according to any one of claims 1 to 9, characterized in that it is connected in parallel.

According to the present invention, the front air outlet unit blows the cooling air supplied from the underfloor chamber directly on the intake surface on the front surface of the rack as a side flow toward the rack, and sends the air through the intake surface into the enclosure of the rack. Even when racks equipped with information processing devices such as high-load servers are connected, air conditioning can be performed.
According to the present invention, the front air outlet unit, particularly the front air outlet unit with a fan, blows the cooling air supplied from the air outlet chamber directly to the intake surface on the front surface of the rack as a side flow toward the rack. It is easy to adjust the amount of side flow to be blown for each rack when passing through the rack, and the wind speed at the outlet is not as high as the perforated panel on the floor. , Because it sends in the same direction of the wind against the small static pressure of the cooling fan of the information processing equipment, avoiding the rise in the suction temperature of the information processing equipment, eliminating unnecessary air blowing and reducing the blowing power It becomes.

According to the present invention, the front air outlet unit blows the cooling air supplied from the underfloor chamber directly on the intake surface on the front surface of the rack as a side flow toward the rack, and sends the air through the intake surface into the enclosure of the rack. This eliminates the need for a cold aisle capping measure for forcibly changing 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. (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. (A) It is sectional drawing which shows the example which installed the front closing board in the tower type front blower outlet unit without a fan, (b) It is a perspective view of a front 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 the BB line of FIG. 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 by connecting a plurality of racks 41 and sandwiching a passage 44, a front outlet unit group 51 and a passage 44 described later.
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 side, and a predetermined number of fans 43c attached to the information processing device 43 are mounted on the exhaust surface 43b side. The rack 41 is aligned with the exhaust surface 43b to form a rack row. That is, the intake surfaces 43a are also arranged in a rack row, and the intake surfaces 43a 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.

On the walls 31a, 31b facing the exhaust surface 43b of the information processing device 43, which is a server of the two rows of rack rows 42, etc., steel tower-type suction units 60a, 60b reaching the floor slab 31f from the ceiling 31e are provided. The passages 45a and 45b are arranged along the wall surfaces 31a and 31b, respectively.
The tower-type suction units 60a and 60b have a height that reaches the floor slab 31f from the ceiling 31e, and have a horizontal width that is at least equal to the horizontal width of the rack row group 42 along the wall 31a or the wall 31b. A substantially rectangular parallelepiped structure having a longitudinal width that can form a passage for taking in the total exhaust amount from the exhaust surface 43b of the information processing equipment 43 in the row group 42 and sending it to the underfloor air conditioner 34 with a reasonable pressure loss. It is configured.

The tower-type suction units 60a and 60b include innumerable suction ports 61a through which air passes from the floor 30 to the same level as the rack 41 of the wall surface 61 on the floor facing the exhaust surface 43b of the rack row group 42. Under the floor, an opening 61b for connecting the air suction port 34b of the underfloor air conditioner 34 via a short duct is provided. The tower-type suction units 60a and 60b may be configured by a steel plate sandwich panel (hereinafter referred to as a panel), except for a large opening for mounting an infinite number of suction openings 61a through which air passes and an opening 61b. .
In the passage 44, a plurality of tower-type front air outlet units 50 are back-to-back so as to face the intake surface 43a of the information processing equipment 43 such as a server in the two-row rack-row group 42. An outlet unit group 51 is arranged.

The tower-type front air outlet unit 50 includes a substantially rectangular parallelepiped frame made of steel and a frame structure 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 of the tower-type front air outlet unit 50 includes an air outlet 52a in which a material having innumerable openings through which air passes, such as a punching plate or a net, is attached to the front surface, and faces the two rows of rack rows 42. A front surface 52 on the side, a top plate 53, a back surface 54 positioned parallel to the walls 31a and 31b, and side surfaces 55a and 55b arranged orthogonally to both ends of the front surface 52 and the top plate 53 via a frame, A bottom surface opening 56a formed by removing the floor panel and the grating of the floor 30 below the bottom surface 56. The bottom surface 56 is provided with a steel frame that forms each side. It communicates with the blow-out chamber 32 formed in the lower part of the.

In addition, the said back surface 54 is good also as sharing one sheet | seat board with the tower type front surface outlet unit group 51 of the tower type of back-to-back two rows.
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 horizontally and vertically arranged 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 outlet unit group 51, the outlet chamber 32 has a plane integral facing the outer contours of a large number of continuous bottom face openings 56 a connected to the tower-type front outlet units 50. The underfloor region is formed by partitioning with panels 32a, 32b, 32c, and 32d that form wall surfaces.
The panels 32a and 32b are erected from the floor slab 31f parallel to the wall surfaces 31a and 31b in the underfloor space formed between the floor slab 31f and the floor 30, and are housings of fan sections of the plurality of underfloor air conditioners 34. Has an opening 33a that fits loosely and is large enough to pass through the length of the underfloor air conditioner 34 at a predetermined position where the underfloor air conditioner 34 is to be installed, and the underfloor air conditioner 34 is mounted in the opening 33a. If not, a lid wall (not shown) for making a closed space as the blowout chamber 32 is fitted into the opening 33a. In addition, a door is installed at the center of each of the panels 33c and 33d as a carry-in port for the underfloor air conditioner 34 so as to be opened and closed.

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, but a part of the number of units is set in accordance with the progress of the mounting of the rack row group 42 on the floor using the inside of the blowout chamber 32 as a carry-in route. Can be installed later.
The underfloor air conditioner 34 is installed by fitting a part of the fan section into the opening 33a of the blowout chamber 32 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 underfloor air conditioner 34 sucks the return air by connecting a return air suction port (section) 34b through a short duct such as a canvas duct to the opening 61b under the floor of the suction units 60a and 60b. The exhaust from the exhaust surface 43b of the information processing equipment 43 of the rack row group 42 is taken in from the units 60a and 60b by the blower suction pressure of the underfloor air conditioner 34 as a pull flow.
The space above the upper surface of the underfloor air conditioner 34 between the shaft-type suction units 60a and 60b and the blowout chamber 32 is a cable rack wiring from the UPS (uninterruptible power supply) to the server room 20 and the air conditioner. It is set as the accommodation space 37 of the heat medium piping to the front.

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 43 installed.
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 blowing chamber 32.

The cooling air supplied to the blowout chamber 32 passes through the floor opening 56a on 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 blowout port 52a to which a material having innumerable openings through which air passes is attached.
A cold aisle is formed in the passage 44 portion between the rack 41 and the tower-type front air outlet unit 50 corresponding to each rack 41.
The wind speed of the side flow toward the rack 41 from the air outlet 52a pasted with a material having innumerable openings through which the air passes through the tower-type front air outlet unit 50 corresponding to each rack 41 is the information processing equipment 43 of the rack 41. It is generated by the fan 59 so as to be slightly faster than the wind speed obtained by dividing the total air volume of the cooling fan 43c by the area in front of the rack.

4 shows the relationship between one tower-type front air outlet unit 50 and the rack 41, the relationship between the other tower-type front air outlet unit 50 and the rack 41 is the same.
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 face each other with the back direction aligned as described above, the path between the two rows of rack rows 42 and the shaft type suction units 60a, 60b. Hot aisles are formed at 45a and 45b.

As shown in FIGS. 2 to 4, the discharged high-temperature exhaust gas is sucked in from the numerous suction ports 61 a through which air flows in the shaft-type suction units 60 a and 60 b, and is returned to the underfloor air conditioners 34 through the short ducts. The air is sucked into the underfloor 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 discharge port 34 a to the blowing chamber 32.
According to the present embodiment, the tower-type front air outlet unit 50 directly blows the cooling air supplied from the air outlet chamber 32 to the air intake surface 43 a on the front surface of the rack 41 as a side flow toward the rack 41. Since the air is fed into the housing of the rack 41 through 43a, it is possible to avoid an increase in the suction temperature of the server 43, particularly a temperature failure of the rack 41 or the like.

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, 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.

  Further, in the present embodiment, the air flow rate of the underfloor air conditioner 34 is controlled by the load or the suction surface temperature of each rack 41 in which the information processing device 43 such as a server is mounted to make the air volume variable, and the tower-type front air outlet unit 50 The air volume from the front air outlet can be made variable, and in particular, in the case of the tower-type front air outlet unit 50 with a fan, the air volume can be further easily changed by controlling the number of fans 59 and the like. It is possible to directly blow cool air with an appropriate increase in air volume only to the rack 41 on which is mounted, and to prevent unnecessary extra cool air from being sent to the rack 41 on which a low load server is mounted, It becomes possible to operate the fan 59 of the outlet unit 50, which saves energy.

In the present embodiment, the case where all the servers 43 are mounted on all the racks 41 in the two-row rack row group 42 has been described. However, the present invention is not limited to this, and the rack on which the server 43 is not mounted. If there is 41, the air conditioner 34 is not disposed below the floor 30 of the tower-type front air outlet unit 50 facing the rack 41, and the server 43 is mounted by blocking the openings 33a and 61b. Cooling air is supplied to the rack 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 underfloor air conditioner 34 is installed corresponding to the rack 41.
Further, in the air conditioning system according to the present embodiment, for example, an air volume adjusting mechanism is provided in the bottom opening 56a of 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 restricted to this, For example, as shown in FIG. The front air outlet unit 50 can also be used.
FIG. 5 shows the relationship between one tower-type front air outlet unit 50 and the rack 41, but the relationship between the other tower-type front air outlet unit 50 and the rack 41 is the same.
Even when the racks 41 on which the high-load servers are mounted continuously form the rack row group 42, even if one of the corresponding underfloor air conditioners 34 stops down, the communication with the blowout chamber 32 is possible. By increasing the air volume of the underfloor air conditioner 34 and supplying it, 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. 6 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. 7, the bottom surface opening 56 a on the floor surface is closed and the opening area of the bottom surface opening 56 a on the floor surface is adjusted by the plate 64 to adjust the air volume.
In FIG. 8, a closing plate 65 is attached to the inside of 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.
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.

10 to 12 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 underfloor air conditioner 34A is a low floor installation type underfloor air conditioner, and an external air conditioner (AHU) 34B is installed in the air conditioning machine room 21 disposed at both ends of the server room 20A. Instead of the air conditioning system according to the first embodiment, the underfloor space is replaced with the blowout chamber 32A. In addition, about the component same as 1st embodiment, the same code | symbol is attached | subjected and detailed description is abbreviate | omitted.

The underfloor air conditioner 34A includes a filter, a cooling coil, and a blower. Since the underfloor air conditioner 34A is installed under a low floor type floor, the 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 external air conditioner (AHU) 34B is installed in the air conditioning machine room 21 omitted in FIG.
The cooling air supplied from the external air conditioner (AHU) 34B is guided to the blowing chamber 32A.
The blowout chamber 32A is formed in the entire area of the underfloor space excluding the plurality of underfloor air conditioners 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 underfloor air conditioner 34A is operated, and cooling air sent from the underfloor air conditioner 34A is supplied to the blowout chamber 32A.
The cooling air supplied to the blowout chamber 32A receives the blowing pressure of the underfloor 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 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 air outlet 52a, which is an infinite number of openings of the tower-type front air outlet unit 50, toward the rack 41 is slightly higher than the air speed sucked into the air conditioner 34 from the air inlet 34b of the underfloor air conditioner 34A. Is generated by the fan 59.

The side flow of the cooling air is blown directly onto 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 rack row group 42 and the suction units 60a and 60b.
As shown in FIGS. 10 to 12, the discharged air is sucked from the suction holes 61 a of the suction units 60 a and 60 b and passes through the suction units 60 a and 60 b from the air suction ports 34 b of the underfloor air conditioners 34. It is sucked into the underfloor air conditioner 34A.

Then, it becomes cooling air again and is blown out into the blowing chamber 32A.
In the second embodiment, the underfloor 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. Therefore, the floor die-casting panel is removed and carried under the floor. In this case as well, the floor panel in the future installation space in which the rack row group 42 in the server room 20A is not installed is removed to the under-floor space. Insert the underfloor air conditioner 34A, insert the underfloor air conditioner 34A through the opening 33a of the last blowout chamber 32A, and install a part of the fan section. It is. If the rack row group 42, which is a load on the floor, is small at the start of the operation of the server room 20A, the underfloor air conditioner 34A is also mounted and operated in accordance with that. The openings 61b of the suction units 60a and 60b that are not mounted are closed by a panel lid (not shown) of the same size. Further, the exhaust air is sucked into the underfloor air conditioner 34A via the short air duct through the suction units 60a and 60b and the return air suction port 34b, but the opening 61b of the underfloor air conditioner 34A that is not mounted is the same. Since it is closed by a large panel lid (not shown), there is no problem with the suction pressure of the return air.

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 adjustment mechanism is provided in the bottom opening 56a of the floor surface, and the air volume from the front air outlet of the tower-type front air outlet unit 50 is variable. It can be.
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 restricted to this, For example, as shown in FIG. The tower-type front air outlet unit 50 without the fan 59 can also be used.

Further, in order to adjust the air volume from the air outlet 52a of the tower-type front air outlet unit 50, as in the first embodiment, for example, an air volume adjusting mechanism is provided as shown in FIGS.
FIG. 6 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. 7, the bottom surface opening 56 a on the floor surface is closed and the opening area of the bottom surface opening 56 a on the floor surface is adjusted by the plate 64 to adjust the air volume.
In FIG. 8, a closing plate 65 is attached to the inside of 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 has been shown. However, the present invention is not limited to this, and as in the first embodiment, for example, as shown in FIG. 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 32, 32A Blowing chamber 33c, 33d Opening 34, 34A, 34B Underfloor air conditioner 34a Cold air outlet 34b of underfloor air conditioner 34 Return air inlet 37 of underfloor air conditioner 34 Accommodating space 41 Rack 42 Rack row group 43 Server 43a Intake surface 43b Exhaust surface 44, 45a, 45b Passage 50 Tower-type front air outlet unit 51 Tower-type front air outlet unit group 52, 54, 55a, 55b Wall surface 52a Air outlet 53 Ceiling 56 Bottom surface 56a Opening 59 Fan 60a, 60b Suction unit 61 Damper 62 Damper plate 64, 65 Closing plate

Claims (10)

A rack row group, which is a two-row rack row that accommodates information processing devices, is mounted with the intake surface side of each information processing device aligned for each rack constituting the two rows of rack rows, and a plurality of the racks are mounted. Aligning the air intake surface to the rack row, the passage that faces the air intake surface side of the rack row is a cold aisle, and the 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 air,
A rack row group in which the rack rows that are sucked from the front side and exhausted to the back side are arranged in parallel on the floor of the chamber with the mutual intake surface side sandwiching the passage of the two cold aisles;
A front air outlet unit that is arranged standing on the floor surface of the chamber in parallel with one passage of the cold aisle on the intake surface side of the rack row group and blows cooling air in a horizontal direction;
A space between the ceiling and floor slab of the chamber is arranged in a shaft shape along the wall surface of the chamber in parallel with the hot aisle passage on the exhaust surface side of the rack row group, and on the exhaust surface side of the rack row group. A suction unit having innumerable suction ports for passing air;
An underfloor space formed between the floor slab and the floor under the floor of the chamber;
An underfloor air conditioner installed in the underfloor space and connected to the suction unit through a short duct with its return air suction port,
In the underfloor space, a panel is erected along a planar outline integrated with the front air outlet unit between two cold aisle passages, and is connected to the outlet of the underfloor air conditioner. An outlet chamber communicating with the bottom surface of the front outlet unit where the floor surface is opened,
The front outlet unit is
Each of the racks has a plurality of air outlets having substantially the same shape as the air intake surface of the rack. The cooling air can be blown horizontally from the air outlets toward the air intake surface of the racks. The cooling air is disposed facing the intake surface of the rack, and cooling air is blown from the plurality of air outlets toward the intake surface of each rack,
The underfloor air conditioner sucks exhaust from the exhaust surface of each rack through the suction unit, generates cooling air again, and supplies the air to the front outlet unit through the blowout chamber. Air conditioning system. A rack row group, which is a two-row rack row that accommodates information processing devices, is mounted with the intake surface side of each information processing device aligned for each rack constituting the two rows of rack rows, and a plurality of the racks are mounted. Aligning the air intake surface to the rack row, the passage that faces the air intake surface side of the rack row is a cold aisle, and the 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 air,
A rack row group in which the rack rows that are sucked from the front side and exhausted to the back side are arranged in parallel on the floor of the chamber with the mutual intake surface side sandwiching the passage of the two cold aisles;
A front air outlet unit that is arranged standing on the floor surface of the chamber in parallel with one passage of the cold aisle on the intake surface side of the rack row group and blows cooling air in a horizontal direction;
A space between the ceiling and floor slab of the chamber is arranged in a shaft shape along the wall surface of the chamber in parallel with the hot aisle passage on the exhaust surface side of the rack row group, and on the exhaust surface side of the rack row group. A suction unit having innumerable suction ports for passing air;
Formed between the floor slab and the floor under the floor of the chamber, and the underfloor space that is connected to the discharge port of the underfloor air conditioner through communication with the bottom floor is open in the front air outlet unit,
An underfloor air conditioner installed in the underfloor space and connected to the suction unit through a short duct with its return air suction port and communicating the discharge port to the underfloor space;
An external air conditioner that is disposed in an air conditioning machine room adjacent to the room, communicates with the room via a return air port provided on an upper wall of the room with the air conditioning machine room, and has a discharge port communicated with the underfloor space. Equipped with a machine,
The front outlet unit is
Each of the racks has a plurality of air outlets having substantially the same shape as the air intake surface of the rack. The cooling air can be blown horizontally from the air outlets toward the air intake surface of the racks. The cooling air is disposed facing the intake surface of the rack, and cooling air is blown from the plurality of air outlets toward the intake surface of each rack,
The underfloor air conditioner sucks exhaust from the exhaust surface of each rack through the suction unit, generates cooling air again, and supplies the air to the front outlet unit through the underfloor space. Air conditioning system. In the air conditioning system according to claim 1 or claim 2,
The said front blower outlet unit is comprised by connecting the frame structure of the substantially rectangular parallelepiped shape made from the steel plate which has the same height and width as the said rack, and the bottom face opens. The air conditioning system characterized by the above-mentioned. In the air-conditioning system in any one of Claims 1 thru | or 3,
The air-conditioning system according to claim 1, wherein the front air outlet unit includes a fan installed so as to blow out horizontally at an air outlet that is an end surface having substantially the same shape as the air intake surface of the rack. In the air-conditioning system in any one of Claims 1 thru | or 3,
The front air outlet unit does not include a fan. In the air conditioning system according to claim 5,
The front air outlet unit includes an air volume adjusting mechanism. The air conditioning system according to claim 6,
The said air volume adjustment mechanism is comprised by providing a damper in opening of the bottom face of the said front blower outlet unit. The air conditioning system characterized by the above-mentioned. The air conditioning system according to claim 6,
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 claim 1, wherein
The underfloor air conditioner is mounted with a cooling coil and a blower arranged in a casing, and a part of a fan section is fitted into an air conditioner opening from which a cover wall that is a part of the wall surface of the blowout chamber is removed. An air conditioning system characterized by Air-conditioning system that is characterized in that the air-conditioning system according to any one of claims 1 to 9, and connected in parallel.

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