JP2012078056A - Air conditioning system for server room - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an air conditioning system for a server room capable of assuring a larger area of the server room by reducing the area of an air conditioning machine room, reducing the total number of air conditioners, and easily and absolutely assuring the security of the server room.SOLUTION: The air conditioning system for a server room is intended for a server room 21 in which many servers 25 are stored in a server rack 26. A building 10 at least includes an air conditioning machine room 22, an uninterruptible power supply room 23, and a server room. An air conditioner 30 installed in the air conditioning machine room is shared for air-conditioning in the server room and the uninterruptible power supply room. The supply air supplied from the air conditioner is supplied to the server room after it is supplied to the uninterruptible power supply room.

Description

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

  As an air conditioning method for a server room (computer room) in a conventional data center or computer center (hereinafter referred to as DC), the server room has a double floor and an air conditioning machine room is provided adjacent to the server room or the server room. It is a general method to cool the entire server room by supplying cold air into the double floor by a floor blower air conditioner installed in the air conditioning machine room and supplying cold air from the double floor to the server room. Yes (see, for example, Patent Document 1).

  In addition, in DC, from the viewpoint of ensuring the reliability of the server power supply, an uninterruptible power supply (hereinafter referred to as UPS) for server power supply is installed near the server room to make the server power supply uninterruptible. It is common. At this time, it is necessary to install a UPS air conditioner as a countermeasure against heat generation of the UPS.

JP 2004-184070 A

Incidentally, the conventional DC plan has the following problems.
The first is that the installation of the server room air conditioner and the UPS air conditioner increases the area of the air conditioning machine room and limits the area of the server room.
Second, the installation of server room air conditioners and UPS air conditioners increases the total number of air conditioners, increasing the burden of air conditioner maintenance, increasing the number of air conditioner failures, The problem of increased power arises.
Third, because the maintenance engineers for servers, UPS, and air conditioners are not the same, it is desirable that the server room, UPS room, and air conditioning machine room be separate rooms to ensure the security of data stored in the server. In addition, since it is necessary to secure the conductors of each maintenance engineer, there is a problem in that there are many restrictions on the planning of the building plan.

  Therefore, the present invention has been made in view of the above circumstances, and it is possible to reduce the area of the air conditioning machine room to secure a large area of the server room and to reduce the total number of air conditioners. And the server room air conditioning system which can ensure the security of a server room easily and reliably is provided.

  In order to solve the above-described problem, the invention described in claim 1 is an air conditioning system for a server room that targets a server room in which a large number of servers are accommodated and installed in a server rack. Having at least an air conditioning machine room, an uninterruptible power supply room and the server room, and an air conditioner installed in the air conditioning machine room is configured to also serve as an air conditioner for the server room and the uninterruptible power supply room, The air supply supplied from the air conditioner is configured to be supplied to the server room after being supplied to the uninterruptible power supply room.

  According to the first aspect of the present invention, since the server room and the uninterruptible power supply room are both air-conditioned by one air conditioner, the total number of air conditioners can be reduced. Therefore, the area of the air conditioning machine room can be reduced, and a large area of the server room can be secured. In addition, since the server room where the server is installed, the air conditioning machine room where the air conditioner is installed, and the uninterruptible power supply room where the uninterruptible power supply unit is installed, the security of the server room can be ensured. it can.

  The invention described in claim 2 is that the structure of the building is configured as a two-layer structure in which the server room is arranged on the upper floor and the air conditioning machine room and the uninterruptible power supply room are arranged on the lower floor. It is a feature.

  According to the invention described in claim 2, since the building has a two-layer structure, the server room is arranged on the upper floor, the air conditioning machine room and the uninterruptible power supply room are arranged on the lower floor, the air conditioner and the uninterruptible power supply When performing maintenance of the apparatus, it is possible to perform maintenance of each device without entering the upper floor where the server room is arranged. Therefore, the security of the server room can be ensured easily and reliably. Moreover, since the installation floors of the server room, the air conditioning machine room, and the uninterruptible power supply room are configured to be different, the degree of freedom in building planning can be improved.

  According to the air conditioning system for a server room of the present invention, since the server room and the uninterruptible power supply room are both air-conditioned by one air conditioner, the total number of air conditioners can be reduced. Therefore, the area of the air conditioning machine room can be reduced, and a large area of the server room can be secured. Moreover, since the number of air conditioners can be reduced, waste of capital investment costs can be reduced. Furthermore, since the server room where the server is installed, the air conditioning machine room where the air conditioner is installed, and the uninterruptible power supply room where the uninterruptible power supply is installed, the security of the server room can be ensured. it can.

It is sectional drawing which shows schematic structure of the building in embodiment of this invention. It is a schematic structure figure showing an air-conditioning system in an embodiment of the present invention. It is a schematic block diagram which shows another aspect of the air conditioning system in embodiment of this invention. It is a figure which shows the temperature / humidity distribution of Sapporo of 2009, and is a graph which illustrated the range which can respond only by outside air cooling, the range which can respond by free cooling or outside air cooling, and the range which uses free cooling and an air cooling chiller together. It is sectional drawing which shows the structure of the server room in embodiment of this invention. It is a figure which shows the simulation result of the thermal environment in embodiment of this invention, and is a figure which shows the state below 3.0 m from a server floor. It is a figure which shows the simulation result of the thermal environment in embodiment of this invention, and is a figure which shows the state below 0.3 m from a server floor. It is a figure which shows the simulation result of the thermal environment in embodiment of this invention, and is a figure which shows the state of 1.0 m upper direction from a server floor. It is a figure which shows the simulation result of the thermal environment in embodiment of this invention, and is a figure which shows the state 2.5 m above a server floor.

Embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a cross-sectional view showing a schematic configuration of a building according to the present embodiment. As shown in FIG. 1, the building 10 has at least a two-layer structure of an upper floor 11 and a lower floor 12, and a server room 21 is installed on the upper floor 11 and an air conditioner 30 is installed on the lower floor 12. And an uninterruptible power supply room (hereinafter referred to as UPS room) 23 in which an air conditioning machine room 22 and an uninterruptible power supply (hereinafter referred to as UPS) 31 are installed. The air conditioning system 1 of this embodiment is intended for the server room 21 and the UPS room 23 in which a large number of servers 25 are accommodated and installed in a server rack 26. The server room 21 has a double floor structure, and includes an underfloor space 27 in which wiring (not shown) and the like are accommodated, and an abovefloor space 28 in which the server rack 26 is installed.

  The UPS room 23 is provided with a UPS 31 for making the power supply of the server 25 uninterruptible. The UPS 31 is equipped with a battery (not shown), and can maintain a power-on state without turning off the server 25 even if a power failure occurs. Therefore, even if an unexpected situation occurs, the server 25 does not go down, and the reliability of the server power supply can be ensured.

  Here, both the server 25 and the UPS 31 generate heat in the start-up state, and if the high temperature state continues, it leads to a failure of the device. Therefore, both the server 25 and the UPS 31 need to be cooled in order to maintain an appropriate temperature.

  FIG. 2 is a schematic configuration diagram showing the air conditioning system 1 of the present embodiment. As shown in FIG. 2, in this embodiment, an air conditioner 30 for cooling the server 25 and the UPS 31 is installed in the air conditioning machine room 22. In the air conditioning system 1, a predetermined number of air conditioners 30 are installed in the air conditioning machine room 22, and an air supply duct 33 is provided from the air conditioner 30 toward the UPS room 23. The conditioned air supplied from the air supply duct 33 is first supplied to the UPS chamber 23 to cool the UPS 31 installed in the UPS chamber 23. For example, the conditioned air is sucked into the suction port 34 provided on the ceiling surface of the UPS chamber 23. A bypass duct 32 is connected to the suction port 34, and the bypass duct 32 is open to the underfloor space 27 of the server room 21 on the upper floor 11, and the conditioned air is configured to be supplied to the server room 21. ing.

  The conditioned air supplied to the underfloor space 27 of the server room 21 cools the passage 62 formed in the server rack 26 of the above-floor space 28 and between the adjacent server racks 26 to a predetermined temperature. The conditioned air that has passed through the server rack 26 and cooled the server 25 is guided to the ceiling space 35 of the server room 21.

  An exhaust duct 36 and an exhaust fan 37 are connected to the ceiling interior space 35 so that part or all of the conditioned air guided to the ceiling interior space 35 can be exhausted outside the building as it is. . In addition, when exhausting air-conditioning air with the exhaust fan 37, it is comprised so that substantially the same amount of fresh air can be taken in into the air conditioner 30 from the air supply gallery 24 provided in the outer wall surface of the air-conditioning machine room 22. ing. In other words, at the time except summer, the exhaust fan 37 exhausts all of the conditioned air, and the outside air cooling operation that always uses fresh air having a low temperature as the conditioned air can be performed. Further, an air supply duct 48 is provided between the air supply gallery 24 and the air conditioner 30, and a salt removal filter 49 or the like may be installed in the air supply duct 48 as a salt damage countermeasure.

  Further, a return air duct 39 is connected to the ceiling space 35, and part or all of the conditioned air guided to the ceiling space 35 can be directly returned to the air conditioning machine room 22 (air conditioner 30). It is configured to be able to. That is, the UPS room 23 and the server room 21 can be cooled together with a single air conditioner 30. The exhaust duct 36, the return air duct 39, and the air supply duct 48 are each provided with an air volume adjusting damper 51, and the air balance of the air conditioning system 1 can be adjusted by appropriately adjusting the opening degree of each damper. Secured.

  As the air conditioner 30, for example, a structure having a filter 42, a blower 43, and a cooling coil 44 in the casing 41 can be suitably employed. However, if the server room 21 can be cooled, the required capacity can be obtained. Accordingly, an air conditioner having an appropriate type and air conditioning capability can be arbitrarily adopted. Note that the blower 43 of the air conditioner 30 is configured so as to reduce the power of the blower 43 by performing inverter control according to the power consumption for each rack row in which a plurality of server racks 26 are arranged, for example. Yes.

  The cooling coil 44 is connected to a cooling tower 45 installed on the rooftop 13 of the building 10 and a cooling water pipe 46, for example. With this configuration, the cooling water cooled by passing through the cooling tower 45 flows through the cooling water pipe (outward pipe) 46a and is supplied to the cooling coil 44, and the cooling water passes through the cooling coil 44. The conditioned air that passes through and simultaneously cools the server room 21 through the cooling coil 44 passes through the heat exchange between the cooling water and the conditioned air so that the conditioned air can be cooled to a predetermined temperature. It is configured. On the other hand, the temperature of the cooling water rises as the conditioned air is cooled. The cooling water that has passed through the cooling coil 44 flows through the cooling water pipe (return pipe) 46 b and returns to the cooling tower 45. In this way, the cooling water circulates between the cooling tower 45 and the cooling coil 44, whereby the conditioned air can be cooled (cooled) without using a heat source. Energy saving can be achieved by performing a free cooling main operation by the cooling tower 45 without using such a heat source.

  Furthermore, by installing the air conditioner 30 configured as described above in the air conditioning machine room 22, an operator can enter the server room 21 during maintenance as in a conventional general air conditioning system in which an air conditioner is installed in the server room 21. There is no need to enter, which is advantageous in ensuring security. That is, the air conditioning system 1 of this embodiment is a high security system that clearly separates the work areas of IT engineers and equipment engineers. Further, when the air conditioner 30 is added or the equipment is updated, the work can be performed in the air conditioning machine room 22, so that the repair work while the server room 21 is operating is also possible.

  The air conditioner 30 can detect the actual operating status of the server 25 by a sensor (not shown) provided to detect ambient environment information such as server current and server temperature (or server rack temperature) every moment. On the basis of this, it is preferable that the optimum cooling operation is performed by, for example, inverter control, so that the most efficient energy saving operation is possible.

As shown in FIG. 3, when there is a possibility that the heat generation load of the server 25 and the UPS 31 cannot be removed only by the above-described air conditioning system 1 at the time when the outdoor temperature in summer reaches a peak, the air cooling chiller 55 is supplementarily provided. May be installed. The air cooling chiller 55 is installed on the rooftop 13, for example, and a refrigerant pipe 56 extends from the air cooling chiller 55. A heat exchanger 57 is provided between the refrigerant pipe 56 and the cooling water pipe 46 so that the cooling water can be cooled to a predetermined temperature. In addition, a cooling coil 58 is provided in the air supply duct 48, and the cooling coil 58 and the refrigerant pipe 56 are connected so that fresh air taken into the air conditioner 30 can be cooled to a predetermined temperature. .
Furthermore, a configuration in which the air-cooled packaged air conditioner 59 is installed in the air-conditioning machine room 22 to cool the server room 21 and the UPS room 23 may be provided as an auxiliary.

  In the air conditioning system 1 of the present embodiment, for example, the inside of the UPS room 23 is maintained at 25 ° C., and the supply temperature of the conditioned air to the server room 21 is controlled to be 26 ° C. By setting the supply air temperature to the server room 21 to 26 ° C., the available time of outside air cooling / free cooling is maximized, and the capacity of the heat source equipment (air cooling chiller 55, air cooling package air conditioner 59, etc.) and the air conditioner 30 is increased. In addition to reduction, it is possible to achieve high efficiency operation of each device.

  As shown in FIG. 4, for example, considering the temperature and humidity distribution in Sapporo in 2009, the server room 21 and the UPS room 23 are air-conditioned only in the outside air within the range of the area A, that is, about 20% of the year. be able to. Similarly, the air conditioning of the server room 21 and the UPS room 23 can be performed within the range of the area B, that is, about 67% of the year by free cooling or outside air cooling. Therefore, in Sapporo, about 87% of the year, the server room 21 and the UPS room 23 can be air-conditioned (cooled) to a predetermined temperature without using a heat source. It should be noted that only when the temperature and humidity conditions are within the range of region C, the combined use of free cooling and air cooling chiller may be employed. By adopting the air conditioning system 1 of the present embodiment, it is possible to reduce the heat source capacity and the running cost.

Next, the configuration in the server room 21 will be described in detail.
As shown in FIG. 5, the server room 21 has a double floor structure, and the lower side of the free access floor 60 is configured as an underfloor space 27 and the upper side is configured as an above-floor space 28. A rack row 61 in which a plurality of server racks 26 in which a plurality of servers 25 are accommodated is connected is arranged at predetermined intervals in the floor space 28, and a path 62 is formed between adjacent rack rows 61, 61. .

  The free access floor 60 is provided with a floor outlet 63 so that conditioned air is blown from the underfloor space 27 toward the above-floor space 28 (in the server rack 26 and the passage 62).

  In addition, a discharge port for discharging the conditioned air supplied into the server rack 26 is formed in the upper portion of the server rack 26, and a bypass duct 64 that connects the discharge port and the space 35 in the ceiling of the server room 21. Is provided. With this configuration, the temperature of the conditioned air that has passed through the server rack 26 rises as the server 25 is cooled, but the warmed conditioned air does not leak into the passage 62 and directly passes through the ceiling. Guided to the interior space 35. That is, in the server room 21, the underfloor space 27 and the passage 62 are configured as cold aisles, and the server rack 26 and the ceiling space 35 are configured as hot aisles. Thus, by clearly dividing the cold aisle and the hot aisle, the cool air and the warm air can be separated, and the cooling efficiency can be improved.

  Specifically, the conditioned air (cold air) supplied from the air conditioner 30 at 25 ° C. is processed so as to blow out to the under-floor space (cold aisle) 27 of the server room 21 at about 26 ° C. after the heat generation in the UPS chamber 23 is processed. It is configured. The conditioned air supplied into the server rack 26 is warmed to about 38 ° C. by the exhaust heat of the server 25. At this time, since the cold aisle and the hot aisle are partitioned, the warmed conditioned air (warm air) is not mixed with the cool air, and is passed from the ceiling space 35 to the return air duct 39 provided at the periphery of the server room 21. It reaches. The warmed air-conditioned air (warm air) is mixed with fresh air (outside air) and cooled according to the outside air conditions, or cooled with cooling water obtained by free cooling and adjusted to a predetermined temperature. Then, it is configured to blow out again into the UPS chamber 23.

Next, the simulation result of the thermal environment of the server room 21 described above will be described. As simulation conditions, the heat generation load per server rack is 8 kW / rack 80%, the number of server racks is 200 racks, the heat generation load of UPS is 0.7% of the electric capacity, and the cool air blowing temperature (blower outlet) Was 25 ° C. and the air flow rate was 325,000 m ³ / h at Δt = 12 ° C.

  The simulation result of the thermal environment for every several heights is shown on the basis of the floor surface of the server room 21. In the following diagram, the temperature is higher as the color is darker.

  FIG. 6 shows the thermal environment of the air conditioning machine room 22 and the UPS room 23 on the lower floor 12, that is, 3.0 m below the server floor (floor surface of the free access floor 60 on which the server rack 26 is installed). The heat generated in the UPS chamber 23 is treated by cold air of 25 ° C. blown from the air conditioner 30, and the inside of the UPS chamber 23 is maintained at 25 to 26 ° C. In this simulation, air conditioning machine rooms 22 are arranged on both sides of the UPS room 23.

  FIG. 7 shows a thermal environment 0.3 m below the server floor, that is, in the underfloor space 27 of the server room 21. After the heat generation in the UPS chamber 23 is processed, the conditioned air (cold air) is blown into the underfloor space 27 at 25 to 26 ° C. Moreover, return air spaces 65 are provided on both sides of the server room 21, and the conditioned air (warm-up) warmed by exhaust heat from the server 25 returns to the air conditioner 30 at about 38 ° C. In this simulation, the space itself formed between the building outer wall and the server room 21 is configured as the return air space 65, and the conditioned air (warm-up) that has passed through the return air space 65 is air-conditioned. It is comprised so that it may be guide | induced to the machine room 22 (air conditioner 30).

  FIG. 8 shows a thermal environment 1.0 m above the server floor, that is, the installation level of the server rack 26. Other than the rack row 61, cold aisles are maintained at 25 to 26 ° C. Moreover, there is no heat generating part in the cold aisle.

  FIG. 9 shows a thermal environment 2.5 m above the server floor, that is, the upper level of the server rack 26. The hot aisle (inside the bypass duct 64) above the server rack 26 passes conditioned air (warm air) heated by the exhaust heat of the server 25 and is sucked into the ceiling space 35 above the server rack 26. Moreover, the other part is maintaining the temperature of 25-26 degreeC as a cold aisle.

  According to the present embodiment, since the server room 21 and the UPS room 23 are both air-conditioned by one air conditioner 30, the total number of air conditioners 30 can be reduced. Therefore, the area of the air conditioning machine room 22 can be reduced, and the area of the server room 21 can be secured large. Further, since the server room 21 in which the server 25 is installed, the air conditioning machine room 22 in which the air conditioner 30 is installed, and the UPS room 23 in which the UPS 31 is installed are partitioned, the security of the server room 21 can be ensured. it can.

  In addition, since the building 10 has a two-layer structure, the server room 21 is arranged on the upper floor 11, and the air conditioning machine room 22 and the UPS room 23 are arranged on the lower floor 12, the maintenance of the air conditioner 30 and the UPS 31 is performed. The maintenance of each device can be performed without entering the upper floor 11 where the server room 21 is arranged. Therefore, the security of the server room 21 can be ensured easily and reliably. Moreover, since the installation floors of the server room 21, the air conditioning machine room 22, and the UPS room 23 are different, the degree of freedom in building planning can be improved.

  The present invention is not limited to the above-described embodiment, and includes various modifications made to the above-described embodiment without departing from the spirit of the present invention. That is, the specific structure and configuration described in the embodiment are merely examples, and can be changed as appropriate.

  For example, in this embodiment, the case where the return air duct 39 which connects between the ceiling space 35 and the air-conditioning machine room 22 is described, but the return air duct 39 is not provided, and the outer wall of the building 10 and the server are provided. The space formed between the chambers 21 may be configured as a return air space (substantially the same as the configuration used in the above-described simulation). By providing the return air space in the vicinity of the outer wall of the building 10 in this way, it is possible to prevent the dew condensation from occurring on the building 10, and the conditioned air that is heated by the exhaust heat of the server 25 passes through the return air space. As a result, heat is exchanged with the outside air, and the temperature of the conditioned air can be lowered.

  In the present embodiment, the building has a two-layer structure. However, if conditions such as the site area permit, the building has a one-layer structure, and the server room, the air conditioning machine room, and the UPS room may be arranged on the same floor. Good.

  DESCRIPTION OF SYMBOLS 1 ... Air conditioning system (air conditioning system for server rooms) 10 ... Building 11 ... Upper floor 12 ... Lower floor 21 ... Server room 22 ... Air conditioning machine room 23 ... UPS room (uninterruptible power supply room) 25 ... Server 26 ... Server rack 30 …air conditioner

Claims (2)

A server room air conditioning system for a server room where a large number of servers are accommodated in a server rack,
As a structure of the building, it has at least an air conditioning machine room, an uninterruptible power supply room, and the server room,
The air conditioner installed in the air conditioning machine room is configured to also serve as the air conditioning of the server room and the uninterruptible power supply room,
An air supply system for a server room, wherein the air supply supplied from the air conditioner is supplied to the server room after being supplied to the uninterruptible power supply room.   The structure of the building is configured as a two-layer structure in which the server room is arranged on the upper floor and the air conditioning machine room and the uninterruptible power supply room are arranged on the lower floor. Air conditioning system for server rooms.

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