JP2010127606A - Air conditioning system for server room - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve air conditioning efficiency by suppressing mixing of cooling air with hot air while suppressing system construction cost. <P>SOLUTION: This air conditioning system for a server room includes: an air exhaust fan 12 provided on the back face 1c side of server racks 10a-10d and discharging hot air of the server racks 11; a plurality of ceiling blowout ports 22 provided on a ceiling 43 coming into contact with a cold aisle and blowing out cooling air supplied from an air conditioner 20 to a floor 41 face coming into contact with the cold aisle; an air supply duct 21 provided under the roof and supplying cooling air from the air conditioner 20 to each of the plurality of ceiling blowout ports 22; a plurality of ceiling suction ports 23 provided on the ceiling 43 brought into contact with the hot aisle and sucking hot air of the server rack groups 10a-10d; and an air return duct 24 provided under the roof and returning hot air sucked by each of the plurality of ceiling suction ports 22 to the air conditioner 20. Alternatively, no ceiling suction port 23 and no air return duct 24 are provided and air return is performed by using the ceiling lower face. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to an air conditioning system for a server room.

  In recent years, with the spread of the Internet and IT systems, the demand for iDC (Internet data center) with a large-scale server room has increased. In the server room, a large number of devices such as servers that generate a large amount of heat are operated. In addition, the problem that it is difficult to ensure the stable operation of the device is notable unless the hot air is effectively discharged. In particular, as a server mounting method, instead of the rack mounting method, a high-density mounting method called a blade server or a 1U (unit) server has begun to be adopted, and the heat generation amount per rack mounting a plurality of servers is rapidly increasing. It is in. Therefore, further improvement of the air conditioning efficiency is required for the air conditioning system of the server room, and for example, the techniques of Patent Documents 1 to 4 are proposed.

  First, the computer room air conditioning system disclosed in Patent Document 1 has a system configuration as shown in FIG. 7A shows a plan view of the computer room air conditioning system, and FIG. 7B shows an elevation view of the computer room air conditioning system. Explaining the outline of the system configuration of the computer room air conditioning system shown in the figure, two rows of rack groups that draw cooling air from the front surface 3b and discharge hot air from the top surface 3a or the back surface 3c on both sides of the passage 4 (2a, 2b) and (2c, 2d) are installed. An air conditioner 6 is installed on the wall surface of the room facing the side surface 3d of the side surfaces 3d and 3e parallel to the short side direction of the rack groups 2a to 2d. It is used as an air supply duct. Further, a floor outlet 7 (perforated panel) for blowing cooling air from below the floor onto the floor is installed on the floor surface of the passage 4. Further, a guide portion (not shown) is provided for guiding the hot air from the upper surface 3a or the rear surface 3c of the rack groups 2a to 2d to the air conditioner 6.

  The space where the hot air of the rack groups 2a to 2d is collected is called “hot aisle”, and conversely, the space where the cooling air blown out by the air conditioner 6 is “cold”. It is called “cold aisle”. In general, servers and peripheral devices (routers, etc.) mounted in each rack of the rack groups 2a to 2d suck in cooling air from the front surface to cool components such as a CPU, and then discharge hot air from the top surface or the back surface. It has a structure like this. Therefore, in the server room, generally, a space in which the front surfaces 3b of the rack groups 2a to 2d on both sides face each other is called a cold aisle, and a space in which the rear surfaces 3c of the rack groups 2a to 2d face each other is called a hot aisle. Cold aisle and hot aisle systems are used.

  According to the above system configuration, the cooling air supplied from the air conditioner 6 flows through the underfloor space 5 and is blown out from the floor outlet 7 onto the floor of the passage 4, that is, to the cold aisle, and the rack groups 2a to 2d. After the equipment mounted on each rack is cooled, it flows through the space above the rack groups 2a to 2d through the hot aisle and is guided to the air conditioner 6. As a result, the airflow of the cold aisle and the hot aisle is separated, and it becomes possible to guide the hot air from the back surface 3c of the rack groups 2a to 2d to the air conditioner 6 so as not to mix with the cooling air, thereby improving the air conditioning efficiency. It can be made to be.

  Next, in the indoor ventilation system disclosed in Patent Document 2, racks are arranged on both sides of the animal breeding room for breeding experimental animals, and the ceiling surface of the air supply side space formed between the racks on both sides is arranged. An air outlet for blowing clean air is provided in the center. Further, a suction port for sucking room air and exhausting it to the outside is provided on the side wall surface of the exhaust side space formed between the back surfaces of the racks on both sides and the wall surface facing the rack. And the adjustment of the wind speed of the clean air blown out from the air outlet, and the suction port located under the side wall surface of the room, the height of the uppermost shelf of the rack and the second shelf from the top. It is said that the ventilation efficiency can be increased by making the airflow distribution at each stage of the rack uniform by adjusting the arrangement.

Next, in the air conditioning system such as the communication / information processing equipment room disclosed in Patent Documents 3 and 4, the equipment room has a double floor structure, which corresponds to the air conditioner 6 disclosed in Patent Document 1. A packaged air conditioner is installed. In addition to the packaged air conditioner, a local cooling device is provided above the passage space formed between the rack rows in a form that is structurally separated from, for example, a rack row suspended from the ceiling. With the above system configuration, the cooling air blown from the packaged air conditioner is introduced into the rack from the bottom of the rack through the underfloor chamber having a double floor structure. Further, hot air from the back of each rack is discharged to the upper part of the rack by a blower at the top of the rack, and sucked into the local cooling device to be cooled. The cooling air cooled by the local cooling device is blown out onto the floor of each passage space and is guided from the front of the rack into the rack. As a result, even if the uniform air speed from the packaged air conditioner cannot be maintained due to an increase in the number of wires in the underfloor chamber, a local high temperature region is generated, and the local cooling device enables local correspondence. .
JP 2006-64303 A Japanese Patent No. 2702234 Japanese Patent No. 3842331 JP 2002-156136 A

  By the way, in the computer room air conditioning system disclosed in Patent Document 1, the applicant applies a predetermined variable (floor) while considering the turbulent flow effect in the non-isothermal field by the non-isothermal SGS model and the buoyancy effect due to the temperature difference. Area (m2), floor blowing temperature (° C), number of floor outlets, air conditioning airflow (CMH), heat generation (kW), rack dimensions (W × D × H), rack airflow (CMH), etc.) When the thermal air flow simulation is performed, the heat accumulation associated with the short circuit phenomenon depends on the number of the air conditioners 6 shown in FIG. 7 and the distance from each rack constituting the rack groups 2a to 2d to the air conditioner 6. Was able to be confirmed. Hereinafter, the generation of this heat pool will be described with reference to FIG. 8 showing a system configuration of a conventional computer room air conditioning system. FIG. 8 is a diagram showing a system configuration in the case where the rack groups 2a to 2d of the first row and the fourth column are replaced with the rack groups 2a to 2h of the second row and the fourth column in the system configuration shown in FIG.

  When the air conditioner 6 is arranged on one side of the side surfaces 3d and 3e parallel to the short direction of the rack groups 2a to 2d, the distance from each rack constituting the rack groups 2a to 2h to the air conditioner 6 is long. As it becomes, the tendency that the airflow on the upper surface 3a side (ceiling side) of the rack groups 2a to 2h is drawn toward the cold aisle becomes remarkable. And it turned out that the area | region (henceforth a stagnation area | region) where airflow stagnate generate | occur | produced in the location far from the air conditioning apparatus 6 by this influence, especially the edge part of rack group 2a-2h. Further, in the stagnation region, there is a short circuit phenomenon in which hot air from the hot aisle enters the cold aisle on the front surface 3b side of the rack groups 2a to 2h and mixes with the cooling air. It was found that a high temperature region (heat pool) was generated in the cold aisle located at a distance.

  For example, in FIG. 8, between the other side surface 3e of the rack groups 2a to 2d at a short distance from the air conditioner 6 and one side surface 3d of the rack group 2e to 2h at a long distance from the air conditioner 6. And the region between the other side surface 3e of the rack groups 2e to 2h and the wall surface facing them are the stagnation region. Further, a drift of hot air is generated along the back surface 3c of the rack group 2a at a short distance from the air conditioner 6 from the back surface 3c of the rack group 2e at a long distance from the air conditioner 6, and the side surface of the rack group 2e. In the region (stagnation region) where 3d and the side surface 3e of the rack group 2a face each other, the hot air discharged from the back surface 3c of the rack group 2e is blocked by the above-mentioned drift and flows into the front surface 3b of the rack group 2e. The hot air discharged from the back surface 3c of 2a is hindered by the above-mentioned drift and wraps around the front surface 3b of the rack group 2a.

  Further, the computer room of Patent Document 1 includes a double floor (free access floor) in order to provide a space for wiring of devices such as servers mounted in the rack groups 2a to 2h under the floor. It is assumed that cooling air from the air conditioner 6 is supplied to the underfloor space 5 of the double floor in which the wiring is accommodated. For this reason, when the number of servers mounted in the rack groups 2a to 2h is changed, the flow path resistance of the underfloor space 5 is changed with the change in the number of wires, and a predetermined wind speed is applied to each rack of the rack groups 2a to 2h. It becomes difficult to feed cooling air. As a result, the occurrence of the stagnation region and the short circuit phenomenon become more prominent.

  For example, when the wind speed of the cooling air from the floor outlet 7 on the floor surface of the passage 4 is higher than a predetermined wind speed, the cooling air is used to cool the rack groups 2a to 2h as shown in FIG. In addition to the airflow used, an airflow that returns directly to the air conditioner 6 is significantly formed. Further, when the wind speed of the cooling air from the floor outlet 7 becomes slower than a predetermined wind speed, a part of the cooling air is used for cooling the upper side of the rack groups 2a to 2h as shown in FIG. Therefore, an air flow (short circuit phenomenon) in which hot air circulates on the upper side of the rack groups 2a to 2h is formed. Further, due to the flow path resistance of the underfloor space 5, as the distance from the air conditioner 6 increases, a phenomenon occurs in which the air speed of the cooling air blown out from each floor outlet 7 is not uniform.

  In addition, the indoor ventilation system disclosed in Patent Document 2 is intended only for ventilation in an animal breeding room, and is intended for a system in which a forced ventilation device such as a fan is not provided in the rack. For this reason, as described above, as a device for making the airflow distribution at each stage of the rack uniform, complicated adjustment of the wind speed of the air outlet and the position of the air inlet is necessary.

  Further, in Patent Document 2, as a conventional technique, a shielding plate (partition plate) is provided between the air supply side work space and the rack so that air that has passed through each stage of the rack does not flow again into the air supply side work space. Thus, a technique for improving the ventilation efficiency is disclosed. For example, as shown in FIG. 10 (a), when the upper surface 3a side of the rack groups 2a, 2b and 2c, 2d forming the cold aisle is shielded by the shielding plate 9a, or as shown in FIG. 10 (b), The case where it shields between the rack groups 2a-2d and a ceiling surface with the shielding board 9b is mentioned, respectively. However, as shown in FIGS. 10 (a) and 10 (b), a closed space is formed when the shielding plates 9a and 9b avoid wraparound of the exhaust. Therefore, a sprinkler and gas fire extinguishing equipment are separately provided for disaster prevention. It may be necessary to provide it. Further, when the height of the rack groups 2a to 2d is not uniform, the shielding plates 9a and 9b may make it difficult to completely and completely shield, and there is a possibility that a gap that causes a short circuit phenomenon is likely to occur.

  In addition, in the air conditioning system such as the communication / information processing equipment room disclosed in Patent Documents 3 and 4, in addition to the usual full sensible heat treatment type packaged air conditioner, the heat generation density of the rack facing the passage space is increased. It is necessary to provide a corresponding number of local cooling devices, and each local cooling device needs to be provided with a sensor, a controller, and a power source, which raises a problem that the construction cost of the entire system increases. Moreover, since it is necessary for each local cooling device not only to perform cooperative control between each other but also to perform air conditioning control in cooperation with a packaged air conditioner, complicated air conditioning control is required for the entire system.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide an air conditioning system for a server room that improves air conditioning efficiency by suppressing mixing of cooling air and hot air while suppressing system construction cost. Is to provide.

  A main aspect of the present invention for solving the above-described problems is that a plurality of server racks each accommodating a server for exhausting cooling air supplied from the front side from the back side are arranged in a row with the orientations of the front and back sides of the server racks respectively aligned. The server rack group is configured such that the front surfaces of the adjacent server rack groups are opposed to each other, and cooling air from a predetermined air conditioner is supplied to a space between the opposed front surfaces to form a low temperature region, and the adjacent server An air conditioning system for a server room arranged so as to form a high-temperature region in which hot air of the server rack group is collected in a space facing each rear surface of the rack group, provided in the server rack constituting the server rack group An exhaust fan for exhausting hot air from the server rack group from the back side of the server rack group, and arrangement of server racks in the server rack group A plurality of ceiling outlets that are arranged in a distributed manner on the ceiling above the low-temperature region and blown out cooling air supplied from the air conditioner via an air supply duct toward the floor surface of the low-temperature region, A plurality of ceiling inlets for sucking hot air from the server rack group, and a plurality of ceiling inlets for sucking hot air from the server rack group, are distributed in the ceiling above the high temperature region along the arrangement direction of the server racks in the server rack group. And a return air duct for returning the heated air to the air conditioner.

  In the air conditioning system of the server room, the air velocity of the cooling air blown out from the ceiling outlet may be a speed at which the air reaches at least a server accommodated in the lowest shelf of the server rack.

  Moreover, it is an air conditioning system of said server room, Comprising: You may provide a blowing nozzle as said ceiling blower outlet.

  Another main aspect of the present invention for solving the above-mentioned problems is that the front and back orientations of a plurality of server racks in which servers for exhausting cooling air supplied from the front are respectively accommodated are aligned in a row. While arranging the plurality of server rack groups arranged, the front surfaces of the adjacent server rack groups are opposed to each other, the cooling air from a predetermined air conditioner is supplied to the space between the opposed front surfaces, and a low temperature region is formed. An air conditioning system for a server room arranged to form a high-temperature region in which hot air of the server rack group is collected in a space facing each back surface of the adjacent server rack group, and the server constituting the server rack group An exhaust fan provided on the back side of the rack and exhausting hot air of the server rack from the back side of the server rack group; and a ceiling above the low temperature region A plurality of ceiling outlets for blowing out cooling air supplied from the air conditioner via an air supply duct toward the floor surface of the low-temperature region, and the lower surface of the ceiling above the high-temperature region The hot air discharged from the back side of the server rack group along the line is returned to the air conditioner.

  Further, in the air conditioning system of the server room described above, the ceiling is defined by a first ceiling surface having a first ceiling height above the low temperature region and the first ceiling height above the high temperature region. It is good also as an uneven | corrugated shaped ceiling which has a 2nd ceiling surface of 2nd high ceiling height.

  Also, in the server room air conditioning system, the plurality of ceiling outlets are distributed on the ceiling above the low temperature region along the arrangement direction of the server racks in the server rack group, and the ceiling outlets The air velocity of the cooling air blown from the air may be at least a speed at which the air reaches the server accommodated in the lowest shelf of the server rack.

  Moreover, it is an air conditioning system of said server room, Comprising: You may provide a blowing nozzle as said ceiling blower outlet.

  ADVANTAGE OF THE INVENTION According to this invention, the air conditioning system of the server room which improved air-conditioning efficiency by suppressing mixing of cooling air and hot air can be provided, suppressing system construction cost.

=== 1st Embodiment (when a ceiling return is a ceiling suction inlet and a return air duct) ===
FIG. 1 is a diagram showing a configuration of an air conditioning system for a server room according to the first embodiment of the present invention. FIG. 1A shows an elevation view of the air conditioning system in the server room, and FIG. 1B shows a plan view of the air conditioning system in the server room. Below, the system configuration | structure of the air conditioning system of the server room 40 shown in FIG. 1 is demonstrated in detail.

  The server room 40 is, for example, a server room where companies and local governments consolidate and maintain and operate core system servers such as accounting, human resources, sales / customer management, etc. This is a server room in an iDC (Internet Data Center) that provides maintenance and operation services. The floor 41 of the server room 40 adopts a double floor structure in which a floor is assembled with hardware on a floor slab, and wiring of devices such as servers is accommodated in the underfloor space 42. Since the underfloor space 42 is used only as a space for storing the wiring of the device, it is not necessary to adopt a double floor structure when it is not used as a space for storing the wiring of the device. The ceiling 43 of the server room 40 adopts a double ceiling structure in which the ceiling is finished under the floor slab on the upper floor, and the air supply duct connected to the air conditioner 20 in the space above the ceiling 43 21 and the return air duct 24 are accommodated.

  Servers to be maintained and operated by the server room 40 have at least a CPU and a memory such as a rack mount server, a 1U (unit) server, a 1U half server (a server half as deep as a 1U server), and a blade server. It is an information processing apparatus, and one unit (one unit) or a plurality of units (plural units) are accommodated for each shelf of the server rack 11. In particular, a blade server is a server in which multiple servers, called blades, that can be inserted and removed are aggregated and mounted in a blade chassis (enclosure), and each blade shares a power supply device, heat dissipation fan, and external interface device in the blade chassis. As much as possible, compared to a rack mount server accommodated in a space of the same size, high-density mounting is achieved. The server as described above includes an air supply mechanism (air supply fan, air supply port, etc.) and an exhaust mechanism (exhaust fan, exhaust port, etc.) so as to supply air from the front and exhaust from the back.

  The server rack 11 is a housing that houses a plurality of servers such as a rack mount server and a blade server, and for example, a 19-inch rack can be adopted. An exhaust fan 12 is mounted on the back surface 1 c side of each shelf of the server rack 11. The exhaust fan 12 is a fan that exhausts hot air discharged from the back surface of one or a plurality of servers housed in each shelf of the server rack 11. In the case of FIG. 1, an example in which the exhaust fan 12 is mounted on each of the three shelves is shown.

  The server rack group 10a is configured by arranging a plurality of server racks 11 in a line with their surfaces aligned. The server rack groups 10b to 10d are the same as the server rack group 10a. As for the arrangement of the server rack groups 10a to 10d, a cold aisle / hot aisle system is adopted, and as shown in FIG. 1B, the front surfaces 1b of the server rack groups 10a and 10c are arranged to face each other. The floor 41 between the front surfaces 1b of the server rack groups 10a and 10c is provided with a work passage 30 through which workers can pass, and a cold aisle (low temperature region) is formed in the space above the work passage 30. . The server rack groups 10b and 10d are also arranged in the same manner as the server rack groups 10a and 10c to secure the work passage 30, and a cold aisle is formed in the space on the work passage 30. On the other hand, a hot aisle (high temperature region) is formed in the space of the floor 41 (exhaust heat side passage 32) information on the back surface 1c side of the server rack groups 10a to 10d. In FIG. 1, the number of rows is the number of server rack groups along the longitudinal direction (width direction) of the server rack group, and the number of columns is the number of server rack groups along the short direction (depth direction) of the server rack group. Then, although the case where arrangement | positioning for implement | achieving the cold aisle / hot aisle system of the server rack groups 10a to 10d is made into 2 rows and 2 columns is shown, it is not limited to this matrix number. The number of matrixes that can realize the arrangement of the cold aisle / hot aisle system, such as 4 rows and 2 columns, may be used.

  The ceiling 43 on the work passage 30 has a number of ceiling outlets 22 corresponding to the number of server racks 11 of the server rack groups 10a, 10c (and server rack groups 10b, 10d) forming the cold aisle / hot aisle. The server rack groups 10a and 10c (and server rack groups 10b and 10d) are arranged in a distributed manner along the arrangement direction of the server racks 11. The cooling effect in the cold aisle can be made uniform by arranging the plurality of ceiling outlets 22 in a distributed manner. In FIG. 1 (b), in the server rack groups 10a and 10c (and server rack groups 10b and 10d) forming the cold aisle and hot aisle, one ceiling outlet 22 is equally spaced for every two server racks 11. Although the case where it is provided is shown, one ceiling air outlet 22 may be provided corresponding to one server rack 11, and the ceiling air outlet 22 may be provided with a space therebetween. May be.

  The ceiling 43 on the heat exhaust side passage 32 has a number of ceiling inlets 23 corresponding to the number of server racks 11 of the server rack groups 10a and 10c (and server rack groups 10b and 10d) forming the cold aisle / hot aisle. Are distributed along the arrangement direction of the server racks 11 in the server rack groups 10a and 10c (and the server rack groups 10b and 10d). By arranging the plurality of ceiling suction ports 23 in a distributed manner, the return efficiency of hot air can be made uniform in the hot aisle. In FIG. 1B, similarly to the ceiling outlet 22, one server rack 11 is provided for every two server racks 11 in the server rack groups 10a and 10c (and server rack groups 10b and 10d) forming the cold aisle / hot aisle. Although the case where the ceiling suction port 23 is provided is shown, one ceiling suction port 23 may be provided corresponding to one server rack 11, and the ceiling suction port 23 may be further spaced. May be provided. In addition, the number of the ceiling outlet 22 and the number of the ceiling inlet 23 may not be the same as FIG.1 (b).

  The air conditioner 20 is, for example, a floor-mounted or floor-mounted separate air-cooled packaged air conditioner. The air-conditioning apparatus 20 is installed outside the server room 40 and is provided in a space above the ceiling 43 of the server room 40. Connected to the return air duct 24. In other words, the cooling air that has been air-conditioned by the air conditioner 20 reaches the ceiling outlet 22 via the air supply duct 21 on the ceiling 43 of the server room 40, and is directed from the ceiling outlet 22 toward the floor 41 of the cold aisle. And blown out. Further, the hot air discharged from the back surface 1c side of the server rack groups 10a to 10d is sucked into the ceiling suction port 23 provided in the ceiling 43 on the hot aisle, and enters the air conditioner 20 via the return air duct 24. Return. The air conditioner 20 may be installed in the server room 40.

  FIG. 2 is a diagram showing an airflow state in the server room 40 by the air conditioning system shown in FIG.

  When the cooling air flowing through the air supply duct 21 from the air conditioner 20 reaches the individual ceiling outlets 22, the cooling air is blown out from the ceiling outlets 22 toward the floor 41 under the cold aisle. The low-temperature cooling air having a large specific gravity is blown out from the ceiling outlet 22 toward the cold aisle floor 41 due to the settling force caused by the temperature difference of the air in addition to the momentum of the airflow blown out from the ceiling outlet 22. The Therefore, the air velocity of the cooling air blown from the ceiling outlet 22 is adjusted to the rack accommodated in the lowermost shelf of the server rack 11 under the situation where the supply and exhaust of the server of each shelf of the server rack 11 is performed. It is only necessary to have at least a speed that can be reached.

  When the cooling air collides with the floor 41 under the cold aisle, it becomes a turbulent flow and is sucked into the server racks 11 from the front surface 1b of the server rack groups 10a and 10b. The cooling air sucked into the server rack 11 is sucked into the equipment from the front surface of the equipment such as a server housed in each shelf of the server rack 11 and used for internal cooling of the equipment. As a result, the hot air obtained by heat exchange between the cooling air and the device is discharged from the back surface of the device.

  Exhaust fans 12 provided on each shelf of the server rack 11 collect hot air from devices such as servers housed in the respective shelves and exhaust them from the back surface 1c of the server rack groups 10a and 10b. Then, the discharged hot air realizes forced convection that is sucked into the ceiling suction ports 23 distributed on the ceiling 43 on the hot aisle upper side on the back surface 1c side of the server rack groups 10a and 10b. Note that high-temperature hot air having a small specific gravity is sucked into the ceiling suction ports 23 distributed on the ceiling 43 by using the buoyancy effect due to the temperature difference of the air in addition to forced convection by the exhaust fan 12.

  As described above, in the server room 40, the flow is “ceiling outlet 22” → “cold aisle” → “server rack group 10” → “hot aisle” → “ceiling inlet 23”. A smooth air flow state can be realized. Moreover, the air flow of the hot aisle and the cold aisle can be separated to suppress the mixing of the cooling air and the hot air (short circuit phenomenon), and the air conditioning efficiency in the server room 40 can be improved.

  Further, by providing the exhaust fan 12 at each stage of the server rack 11, when the cooling air is blown out from the ceiling outlet 22 so as to collide with the floor 41, the cooling air diffuses into the cold aisle, and the inside of the server rack 11. The cooling air can be evenly supplied to each shelf by the exhaust fan 12. Even if the wind speed of the cooling air blown out from the ceiling outlet 22 is such that it does not collide with the floor 41 in the cold aisle, it is a low-temperature cooling air having a large specific gravity, so it depends on the temperature difference from the room air. The cooling air can collide with the floor 41 by the settling force. For this reason, as above-mentioned, since the wind speed of the cooling air blown out from the ceiling blower outlet 22 should just be the speed which reaches | attains the rack accommodated in the lowest shelf of the server rack 11, the air conditioner 20 The burden of air conditioning power can be reduced.

  Further, the cooling air sucked into the server rack 11 rises in temperature by, for example, 8 ° C. to 15 ° C. and becomes hot air having sufficient buoyancy associated with the temperature difference from the indoor air. There is no need to consider. In this air conditioning system, both the “temperature difference between cooling air and room air” and “temperature difference between hot air and room air” are used to form the airflow distribution, both of which are mixed with cooling air and hot air. It plays a role to suppress.

  Further, as shown in FIG. 10, the air conditioning system can suppress mixing of cooling air and hot air without forming a closed space by the shielding plates 9a and 9b. There is no need to install new disaster prevention equipment such as gas fire extinguishing equipment. In addition, mixing of the cooling air and hot air can be suppressed without providing the above-described local cooling device at the ceiling outlet 22, and the control of the general central air conditioning system by the air conditioner 20 is almost as it is. Can be diverted. For this reason, according to this air conditioning system, when the mixing of cooling air and hot air is suppressed, an increase in system construction cost can be suppressed.

  In addition, since this air conditioning system does not use the underfloor space 42 of the floor 41 of the server room 40 as a space for air supply, it is not necessary to be affected by the underfloor wiring with respect to the air supply. Even if it is, stable air supply characteristics can be obtained.

  Further, according to the present air conditioning system, since mixing of cooling air and hot air can be suppressed without providing the shielding plates 9a and 9b shown in FIG. 10, the height of each server rack 11 in the server rack groups 10a and 10b is high. Even if the length is not uniform, the system can be constructed without hindrance.

  In the above description, the return air duct 24 is provided in the space behind the ceiling, but the space other than the air supply duct 21 in the back of the ceiling is provided in the space behind the ceiling without providing the return air duct 24. It may be used as

=== 2nd Embodiment (when using the space under a ceiling for return air space) ===
FIG. 3 is a diagram showing a configuration of an air conditioning system for a server room according to the second embodiment of the present invention. FIG. 3A shows an elevation view of the air conditioning system in the server room, and FIG. 3B shows a plan view of the air conditioning system in the server room. In addition, the same code | symbol is attached | subjected about the component same as the air conditioning system shown in FIG.

  Only the difference from the air conditioning system shown in FIG. 1 will be described. In the case of the server room 49 shown in FIG. 3, the space below the ceiling 43 in contact with the hot aisle without providing the ceiling outlet 22 and the return air duct 24. We are using.

  That is, the hot air of the devices such as servers housed in each shelf is collected by the exhaust fans 12 provided on each shelf of the server rack 11 and is discharged from the back surface 1c of the server rack groups 10a and 10b. Then, the discharged hot air forms an air flow toward the ceiling 43 on the hot aisle upper part on the back surface 1c side of the server rack groups 10a and 10b by the buoyancy effect due to the temperature difference of the air in addition to the forced ventilation by the exhaust fan 12. .

  The hot air rising to the ceiling 43 becomes a flow of airflow toward the air conditioner 20 by the intake fan included in the air conditioner 20. The hot air sucked into the air conditioner 20 becomes cooling air by the air conditioning process, and flows toward the individual ceiling outlets 22 via the air supply duct 21.

  The subsequent air flow is the same as in the first embodiment, and the low-temperature cooling air having a large specific gravity uses the settling force due to the temperature difference of the air in addition to the momentum of the air flow blown from the ceiling outlet 22. Then, the air is blown out from the ceiling outlet 22 toward the cold aisle floor 41. Then, when the cooling air collides with the floor 41 under the cold aisle, it is diffused around and sucked into the server racks 11 from the front surface 1b of the server rack groups 10a and 10b. The cooling air sucked into the server rack 11 is sucked into the equipment from the front surface of the equipment such as a server housed in each shelf of the server rack 11 and used for internal cooling of the equipment. As a result, the hot air obtained by heat exchange between the cooling air and the device is discharged from the back surface of the device.

  As described above, in the server room 49, the flow is “ceiling outlet 22” → “cold aisle” → “server rack group 10” → “hot aisle” → “bottom of the ceiling”, and both air supply and exhaust are smooth. An air flow state can be realized. Moreover, the air flow of the hot aisle and the cold aisle can be separated to suppress the mixing of the cooling air and the hot air, and the air conditioning efficiency in the server room 49 can be improved. Furthermore, unlike the first embodiment, the system construction cost can be further reduced because the return air duct 24 is not required.

  In order to more effectively realize the present embodiment, the height h2 of the second ceiling surface 46 of the hot aisle is set to the first ceiling of the cold aisle as shown in the elevation view of the server room 49 shown in FIG. It is preferable to employ an uneven ceiling (hereinafter referred to as an uneven ceiling) 44 that is higher than the height h1 of the surface 45. In the example shown in FIG. 4, the server rack groups 10a to 10d are arranged in one row and four columns.

  The space between the first ceiling surfaces 45 adjacent to the floor 41 surface side of the second ceiling surface 46 is hot air exhausted from the back surfaces 1c of the server rack groups 10a, 10b to the air conditioner 20. It is used as a return air space 47 heading. On the other hand, a ceiling outlet 22 is provided on the first ceiling surface 45. Therefore, the hot air flow and the cooling air flow are more reliably separated based on the hot air buoyancy and the cooling air settling force, and the air conditioning efficiency in the server room 49 can be further improved. it can.

=== 3rd Embodiment (when providing a blowing nozzle as a ceiling blower outlet) ===
5 and 6 are elevational views of an air conditioning system for a server room according to the third embodiment of the present invention. FIG. 5 shows a case where the blowout nozzle 48 is provided as the ceiling blowout port 22 of the server room air conditioning system of the first embodiment shown in FIG. 2, and FIG. 6 shows the second case shown in FIG. The case where the blowing nozzle 48 is provided as the ceiling outlet 22 of the air conditioning system of the server room of the embodiment is shown.

  As shown in FIGS. 5 and 6, by providing a blowing nozzle 48 as the ceiling outlet 22, the wind speed of the cooling air blown from the ceiling surface toward the floor 41 is accommodated in the lowest shelf of the server rack 11. It is easy to adjust the speed to reach the server (preferably the speed at which the cooling air collides with the floor 41). That is, the pressure energy is converted into velocity energy by blowing out with pressure from the outlet of the blowing nozzle 48. As a result, even when the wind speed of the cooling air blown from the blowing nozzle 48 is lowered due to the flow path resistance in the air supply duct 21, the speed of reaching the server accommodated in the lowermost shelf of the server rack 11 is increased. It becomes possible to maintain, the mixing of cooling air and hot air can be further suppressed, and the air conditioning efficiency in the server room 49 can be further improved.

  In addition, in the case of the floor blowing method, the structure that can be used for the blowout outlet is limited to the grating structure (grating cover of the lattice) in consideration of ensuring the safety of the passage of the worker, but the ceiling blowout as in the present invention. In the case of the system, such a limitation is not necessary, and the degree of structural freedom that can be adopted becomes high. Therefore, it is possible to design the system construction cost to be kept low together with the improvement of the air conditioning efficiency.

  Further, according to the present air conditioning system, since mixing of cooling air and hot air can be suppressed without providing the shielding plates 9a and 9b shown in FIG. 10, the height of each server rack 11 in the server rack groups 10a to 10d is high. Even if the length is not uniform, the system can be constructed without hindrance.

  Although the best mode for carrying out the present invention has been described above, the above embodiment is intended to facilitate understanding of the present invention and is not intended to limit the present invention. The present invention can be changed and improved without departing from the gist thereof, and equivalents thereof are also included in the present invention.

FIG. 1A is an elevation view of the air conditioning system of the server room according to the first embodiment of the present invention, and FIG. 1B is a plan view of the air conditioning system of the server room. It is the figure which showed the airflow condition in the server room by the air conditioning system shown in FIG. FIG. 3A is an elevation view of an air conditioning system for a server room according to the second embodiment of the present invention, and FIG. 3B is a plan view of the air conditioning system for the server room. It is an elevational view of another server room according to the second embodiment of the present invention. It is an elevational view of an air conditioning system for a server room according to a third embodiment of the present invention. It is an elevation view of the other air conditioning system of a server room concerning a 3rd embodiment of the present invention. FIG. 7A is a plan view of a conventional computer room air conditioning system, and FIG. 7B is an elevation view of the conventional computer room air conditioning system. It is the figure which showed the other system structure of the conventional computer room air conditioning system shown in FIG. FIG. 9A is a diagram showing an air flow situation when the wind speed of the cooling air from the floor outlet becomes higher than a predetermined wind speed in the conventional computer room air conditioning system shown in FIG. (B) is the figure which showed the airflow condition in case the wind speed of the cooling air from a floor outlet becomes slower than predetermined | prescribed wind speed in the conventional computer room air conditioning system shown in FIG. FIG. 10 (a) is a diagram showing a case where a shielding plate is provided to form a closed space in the conventional computer room air conditioning system shown in FIG. 9, and FIG. 10 (b) is similar to FIG. 10 (a). FIG. 5 is a diagram showing a case where another different closed space is formed from a shielding plate.

Explanation of symbols

10a to 10d Server rack group 11 Server rack 12 Exhaust fan 20 Air conditioner 21, 50 Air supply duct 22 Ceiling outlet 23 Ceiling inlet 24 Return air duct 30 Work passage 30
40, 49 Server room 41 Floor 42 Under floor space 43 Ceiling 44 Uneven ceiling 45 First ceiling surface 46 Second ceiling surface 47 Return air space 48 Blowout nozzle

Claims (7)

A plurality of server rack groups arranged in a line with the front and back directions of a plurality of server racks each accommodating a server for exhausting cooling air supplied from the front side from the back side are arranged in front of adjacent server rack groups. The cooling air from a predetermined air conditioner is supplied to a space between the front surfaces facing each other to form a low temperature region, and the server is installed in a space facing each back surface of the adjacent server rack group. An air conditioning system for a server room arranged to form a high temperature region that collects hot air from a rack group,
An exhaust fan which is provided in the server rack constituting the server rack group and exhausts hot air of the server rack from the back side of the server rack group;
The cooling air that is distributed and arranged on the ceiling above the low temperature region along the arrangement direction of the server racks in the server rack group and that is supplied from the air conditioner via an air supply duct to the floor surface of the low temperature region. A plurality of ceiling outlets that blow out toward the
A plurality of ceiling inlets that are distributed and arranged on the ceiling above the high temperature region along the arrangement direction of the server racks in the server rack group, and suck in hot air of the server rack group,
A return air duct for returning the hot air sucked from each of the plurality of ceiling suction ports to the air conditioner;
A server room air conditioning system characterized by comprising: The server room air conditioning system according to claim 1,
An air conditioning system for a server room, characterized in that the cooling air blown from the ceiling outlet is at a speed that allows at least a server accommodated in a lowermost shelf of the server rack. The server room air conditioning system according to claim 2,
An air conditioning system for a server room, comprising a blowout nozzle as the ceiling blowout port. A plurality of server rack groups arranged in a line with the front and back directions of a plurality of server racks each accommodating a server for exhausting cooling air supplied from the front side from the back side are arranged in front of adjacent server rack groups. The cooling air from a predetermined air conditioner is supplied to a space between the front surfaces facing each other to form a low temperature region, and the server is installed in a space facing each back surface of the adjacent server rack group. An air conditioning system for a server room arranged to form a high temperature region that collects hot air from a rack group,
An exhaust fan which is provided on the back side of the server rack constituting the server rack group and exhausts hot air of the server rack from the back side of the server rack group;
A plurality of ceiling outlets that are provided on the ceiling above the low-temperature region and blow out cooling air supplied from the air conditioner via an air supply duct toward the floor surface of the low-temperature region;
And returning the hot air discharged from the back side of the server rack group along the lower ceiling surface above the high temperature region to the air conditioner,
An air conditioning system for server rooms. The server room air conditioning system according to claim 4,
The ceiling,
A first ceiling surface at a first ceiling height above the low temperature region;
A second ceiling surface having a second ceiling height higher than the first ceiling height above the high temperature region;
That the ceiling has an uneven shape,
An air conditioning system for server rooms. The air conditioning system for a server room according to claim 4 or 5,
The plurality of ceiling outlets are distributed and arranged on the ceiling above the low temperature region along the arrangement direction of the server racks in the server rack group,
The air speed of the cooling air blown out from the ceiling outlet is at least a speed for reaching the server accommodated in the lowest shelf of the server rack,
An air conditioning system for server rooms. The server room air conditioning system according to claim 6,
An air conditioning system for a server room, comprising a blowout nozzle as the ceiling blowout port.