JP2015021632A - Server rack indoor system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a server rack indoor system including an air-conditioning structure capable of supplying cold air as uniform as possible over the whole server rack room without increasing a scale of the server rack room and steeply increasing manufacturing costs of the server rack room.SOLUTION: In a server rack indoor system 10 in which a server rack array 2 composed of two or more server racks 1 is disposed on a floor including a supply opening 4a, an underfloor space UL is disposed at a lower part of the floor, an air conditioner 3 is fluid-communicated with the underfloor space UL, and cold air supplied to the underfloor space UL from the air conditioner 3 is supplied to the server rack array 2 through the supply opening 4a, a shield member 5 lower than a height of the underfloor space UL, is disposed in the underfloor space UL.

Description

  The present invention relates to a server rack indoor system in which at least two server rack rows are arranged with a passage therebetween.

  Provide a variety of functions and services to multiple PCs on a network such as the Internet or LAN, and servers that centralize data are integrated in a rack to form a server rack, and multiple server racks are arranged adjacent to each other Thus, a server rack row is formed, and a plurality of server rack rows are arranged with a passage therebetween to constitute a server rack indoor system. The passage between each server rack row forms either a hot aisle space where exhaust is exhausted from the back of the server rack or a cold aisle space where cool air is provided. In general, hot aisle spaces and cold aisle spaces are formed alternately. This server rack indoor system may be referred to as a data center.

  The passage has, for example, a double floor structure, and a large number of outlets through which cool air flows are opened on the upper floor constituting the double floor, and the cool air provided from the air control device is double It circulates in the underfloor space formed between the floors.

  Then, the cold air provided to the cold aisle space through the air outlet is provided to each server rack constituting the server rack row via the front surface of each server rack row facing the cold aisle space, and stored in the server rack. In the process of passing through the server, the cool air takes away heat, rises in temperature, becomes warm air, and is discharged from the back of the server rack to the hot aisle space. The exhaust exhausted from the back of the server rack is returned to the air conditioner, air control device, etc., where it is returned to the cold air again, and by repeating such cold air circulation in the server rack room, Generally, each server is controlled to a predetermined temperature state.

  In this way, the air conditioning system that flows cold air from the air conditioner into the underfloor space of the double floor and blows cold air from the floor to the cold aisle space and provides it to each server rack is sometimes called floor blowing air conditioning, It is distinguished from an air conditioning system in which cool air is supplied from the air conditioner in the lateral direction to provide cool air to each server rack.

  By the way, with regard to the above-described floor blowing air conditioning, especially in a server rack room with a large heat load, the amount of blowing of cool air provided from the floor often does not become uniform. However, a heat accumulation occurs, and the heat accumulation is likely to be generated in the server rack room at a higher temperature than the other areas due to the heat accumulation.

  This is one of the causes of operation failure because the server rack and IT equipment inside the server rack are not sufficiently cooled in the vicinity of the uneven heat location. In view of this problem, development of a server rack indoor system equipped with a floor blowout air-conditioning structure capable of providing cool air as uniformly as possible over the entire server rack room in order to eliminate the occurrence of such uneven heat locations. Is anxious.

  Here, in Patent Document 1, an air supply chamber is provided between the air conditioner and the underfloor space, the air conditioner and the underfloor space are communicated via the air supply chamber, and low temperature air cooled by the air conditioner is supplied to the air supply chamber. An air conditioning system is disclosed that is configured to diffuse inside and supply to the underfloor space from the inside of the air supply chamber and to supply air into the room from the floor outlet.

  According to this air conditioning system, the low-temperature air cooled by the air conditioner is once supplied into the air supply chamber and then supplied to the underfloor space, so that the air velocity of the low-temperature air supplied from the air supply chamber to the underfloor space is uniform. It can be done.

  On the other hand, Patent Document 2 discloses a device installation space in which a heat generating device is installed, an underfloor space provided under the floor of the device installation space, and air in which the temperature is controlled by taking in air in the device installation space. An air conditioner for performing the above operation, a grill that is provided between the equipment installation space and the underfloor space and that supplies temperature-controlled air from the underfloor space to the equipment installation space, and has a predetermined opening ratio and the upper and lower first floor spaces An air-conditioning structure for a data center is disclosed that includes a space and a wind direction control plate that divides into a second space.

  According to the air conditioning structure of this data center, the underfloor space is partitioned vertically by a perforated wind direction control plate, so that the flow of cold air sent from the air conditioner goes upward through this wind direction control plate. The air volume blown out from the grill is made uniform and air conditioning can be performed efficiently.

JP 2010-54095 A JP 2012-127627 A

  According to Patent Documents 1 and 2, the air velocity of the low-temperature air supplied to the underfloor space can be made uniform, or the amount of air blown from the grill can be made uniform, thereby efficiently performing air conditioning. However, in the air conditioning system disclosed in Patent Literature 1, since the installation position of the air conditioner is increased and the air supply chamber is provided below the air conditioning system, the construction cost of the server rack room increases, There is a problem that the scale of the server rack room increases because the height has to be increased.

  On the other hand, in the data center disclosed in Patent Document 2, since an underfloor space composed of two spaces is provided, the construction cost of the server rack room increases in the same manner as the air conditioning system of Patent Document 1, and the server rack room There is a problem that the scale of the server rack room increases because the height of the server rack must be increased.

  The present invention has been made in view of the above-described problems, and it is not necessary to increase the scale of the server rack room, and further, without increasing the construction cost of the server rack room, the entire server rack room is covered. It is an object of the present invention to provide a server rack indoor system equipped with a floor blowing air-conditioning structure that can provide cold air as uniformly as possible.

  In order to achieve the above object, in the server rack indoor system according to the present invention, a server rack row composed of two or more server racks is arranged on a floor provided with a blowout opening, and below the floor is an underfloor space. A server rack indoor system in which an air conditioner is in fluid communication with the underfloor space, and the cool air provided from the air conditioner to the underfloor space is provided to the server rack row through the blowout port In this case, a shielding member having a height lower than the height of the underfloor space is installed in the underfloor space.

  In the server rack indoor system of the present invention, a shielding member having a height lower than the height of the underfloor space is installed at an appropriate position in the underfloor space of the server rack room having a double floor. The cold air flow that has been provided in the underfloor space is made gentle, and the cold air that has flowed gently is provided throughout the underfloor space, so that the cold air outlets at various locations above the underfloor space It is possible to provide cold air whose blowout amount is made as uniform as possible above (cold aisle space).

  The cold air blown down from the air conditioner generally circulates in the underfloor space vigorously, and for this reason, it is difficult to provide a uniform amount of cold air throughout the underfloor space. In the present invention, as a function of the shielding member, the momentum of the cold air blown down from the air conditioner is killed to generate a gentle flow of cold air. For example, in the process of exceeding the weir of the shielding member, the momentum of the cold air is killed to make the flow gentle, and by providing the cold air with a gentle flow in this way, the cold air with a gentle and uniform flow velocity is provided throughout the floor. Can be provided.

  Further, in order to make the shielding member exhibit such an action, the shielding member is installed in the vicinity of the air conditioner and at a position away from the air conditioner that can effectively kill the cold air. Is desirable. However, since such a position fluctuates depending on the flow rate or air volume of the cool air provided from the air conditioner, the installation position of the shielding member is set in consideration of the general flow rate of the provided cool air.

  Moreover, there are various installation forms of shielding members depending on the form of the air conditioner. For example, in a server rack room having a rectangular planar shape, when an air conditioner having a certain width is disposed in front of each of two or more cold aisle spaces, a shielding member having a width wider than the width of each air conditioner The installation form etc. which install this in front of each air conditioner can be applied.

  According to the server rack indoor system of the present invention, since a simple configuration in which a shielding member is simply installed at an appropriate position in the underfloor space is applied, the height scale of the server rack room is increased as in Patent Documents 1 and 2. Therefore, the construction cost of the server rack room does not need to be increased, and it is possible to provide the cool air whose blowout amount is controlled as uniformly as possible above the floor in the entire area of the server rack room. In addition, adjustment to make the air volume uniform is easy, and adjustment can be performed even while the server is in operation. For example, if the separation between the air conditioner and the shielding member is t, the height of the shielding member is h, and the width of the shielding member is d, t, h, and d can be freely changed. It is possible to easily adjust t, h, and d manually. In particular, since d is actually about 1 m, it is light in weight and can be carried and moved by a worker with one hand. Moreover, adjustment for every cold aisle is also possible. In the case of a short fence type (shield member width: strips with d of about 1m), the height can be adjusted by moving the corresponding shield member for each target cold aisle or for each cold aisle, or by stacking parts. Therefore (a form in which a screen of a shielding member to be described later is configured from a laminated body formed by laminating square steel materials), fine adjustment is possible, and by extension, adjustment for each cold aisle is also possible. Furthermore, since it is only placed in the underfloor space, interference with other devices and a space for a shielding member are not required. As a result, both initial cost and running cost are low.

  Here, as an embodiment of the shielding member, a form in which the shielding member has a partition and the partition includes a movable blade can be exemplified.

  When the partition includes, for example, two or more movable blades in the height direction, it is easy to provide cool air with a gentle and uniform flow velocity over the entire floor by appropriately adjusting the angle of each movable blade.

  For example, when the shielding member includes three movable blades, the angle of each movable blade is adjusted manually (for example, the angle of the upper blade of the three movable blades is made vertical (closed)). In addition, the blade angle was gradually increased in the order of the central blade and the lower blade, etc.), and the test was performed to install the shielding member by adjusting the angle of each movable blade so that the wind speed is uniform throughout the floor. By arranging a shielding member in which the angle of each movable blade is adjusted to the optimum angle in a suitable location in the underfloor space, a uniform amount of cold air is always provided throughout the room after the server rack indoor system is used. Will be. In addition, an operator may enter the underfloor space after maintenance and manually adjust the angle of each movable blade.

  Also, measure the differential pressure above and below the floor at multiple locations in the server rack room, and if there are deviations in the differential pressure at each location, eliminate these differential pressure deviations at each location. The air speed and the amount of blowout of cold air can be made uniform. Therefore, it is preferable to adjust the height of the screen of the shielding member or adjust the angle of each movable blade in order to eliminate such a deviation in the differential pressure at each location.

  Another embodiment of the server rack indoor system according to the present invention is a pressure sensor that detects the pressure above and below the floor, receives detection data from each pressure sensor, calculates the differential pressure between them, An angle control unit that adjusts the angle of the movable blade according to the pressure is further provided.

  In the system of the present embodiment, the differential pressure above and below the floor, and the angle of movable blades that can provide cool air at a uniform flow rate over the entire floor according to the differential pressure (the angle of each movable blade when there are multiple movable blades) It is specified in advance, and this specified data is stored in the angle control unit. For example, pressure sensors unique to the respective locations are installed at the upper and lower positions of the floors at a plurality of locations in the server rack room, and detection data is transmitted from each pressure sensor to the angle control unit. This angle control unit calculates the differential pressure above and below the floor at each location, and calculates the differential pressure deviation at each location. The angle control unit stores, for example, data relating to a differential pressure deviation for each of a plurality of pressure measurement locations in the server rack room. Then, in order to make the amount of cool air blown out at each location in the server rack room uniform for each differential pressure deviation, the angle of each movable blade of the shielding member is changed variously to measure the amount of blowout at each location. The angle of each movable blade of the shielding member that can eliminate the deviation is set for each deviation of the differential pressure, and this setting data is also stored in the angle control unit. In this way, the optimum angle of each movable blade of the shielding member is set for each of the differential pressure deviations at a plurality of locations in the server rack room, and based on the detection data received by the angle control unit at that time The movable blade angle suitable for the differential pressure is collated, a control signal is transmitted to each movable blade so that each movable blade has the determined angle, and the angle adjustment of each movable blade is automatically performed. If the angle of each movable blade of the shielding member is set in advance so that the amount of cold air blown out at each location in the server rack chamber is uniform for each differential pressure deviation, the angle of each movable blade is set as described above. The angle of each movable blade of each shielding member may be manually adjusted in accordance with the differential pressure measured by the administrator and the deviation of the differential pressure at each location.

  In another embodiment of the server rack indoor system according to the present invention, the first differential pressure detection method in which pressure sensors corresponding to the vertical position of each floor are installed at a plurality of locations on the floor, or on the floor. Applying any one of the second differential pressure detection methods, in which a traveling groove is provided, and a traveling carriage provided with a pressure sensor at each of the vertical positions of the floor is applied, the differential pressure between the floor and the entire floor is applied. Is to be detected.

  According to the system of the present embodiment, the differential pressure between the floor and the floor in the entire server rack room can be identified as needed. In addition, according to the 1st differential pressure detection method, it is only necessary to install a pressure sensor in an appropriate place, and the base and installation position of a pressure sensor can be changed at any time as needed. Note that a simple measurement method may be used in which the differential pressure measurer moves the pressure sensor to measure the pressure above and below the floor at each location in the server rack room sequentially, and measures the differential pressure above and below the floor at each location. Of course.

  Furthermore, in another embodiment of the server rack indoor system according to the present invention, the shielding member has a partition, and the partition is formed by fixing a laminate formed by stacking square steel materials with a fixing member, The height of the partition is adjusted by adjusting the number of stacked square steel materials.

  Since the screen of the shielding member is composed of a laminated body made of laminated square steel materials, the production cost of the shielding member is reduced because a general square steel material is applied. This can be done easily by adjusting the number of layers.

  As can be understood from the above description, according to the server rack indoor system of the present invention, a shielding member having a height lower than the height of the underfloor space is installed at an appropriate position in the underfloor space of the server rack room having a double floor. By applying the above configuration, the construction cost of the server rack room is not increased, the scale of the server rack room is not increased, and the shielding member has been provided from the air conditioner to the underfloor space. The flow of cold air can be made gentle, and cool air with a gentle flow can be provided throughout the underfloor space, and as much as possible above the cold air outlets at various places above the underfloor space. It is possible to provide cold air with a uniform blowout amount.

It is a top view which shows Embodiment 1 of the server rack indoor system of this invention. It is an II-II arrow line view of FIG. It is a perspective view which shows Embodiment 1 of a shielding member. It is a perspective view which shows Embodiment 2 of a shielding member. It is a perspective view which shows Embodiment 3 of a shielding member. It is a perspective view which shows Embodiment 4 of a shielding member. It is a top view which shows Embodiment 2 of the server rack indoor system of this invention. It is a VIII-VIII arrow line view of FIG. It is a top view which shows Embodiment 3 of the server rack indoor system of this invention. It is the figure which showed the experimental result which measures the wind speed value in the several measurement point of a server rack room regarding the case where there is a shielding member and it is not.

  Embodiments 1 to 3 of the server rack indoor system and Embodiments 1 to 4 of the shielding member of the present invention will be described below with reference to the drawings.

(Embodiment 1 of server rack indoor system and shielding member)
FIG. 1 is a plan view showing Embodiment 1 of the server rack indoor system of the present invention, and FIG. 2 is a view taken in the direction of arrows II-II in FIG.

  In the illustrated server rack indoor system 10, a plurality of server racks 1 are arranged side by side above the double floor 4 to form a server rack row 2, and the plurality of server rack rows 2 are arranged via a passage. The whole is composed. Each passage between the opposing server rack rows 2 absorbs heat in the process of passing cold air through the cold aisle space CA on the front side of the server rack and on the side where cold air is taken into the server rack 1. The hot aisle space HA from which the high-temperature exhaust gas generated in this way is discharged is formed, and the cold aisle space CA and the hot aisle space HA are alternately formed.

  In the server rack room having a rectangular shape in plan view, a unique air conditioner 3 (two in the illustrated example) is disposed in front of each cold aisle space CA. The arrangement of the air conditioner is not limited to the front position of the cold aisle space, and further air-conditioning is performed at other parts (for example, the left and right edges of the server rack room in FIG. 1) as necessary. The form in which a machine is arranged may be sufficient.

  As shown in FIG. 2, the double floor 4 includes an upper floor 4A and a lower floor 4B, and an underfloor space UL having a height t1 is formed between the upper and lower floors 4A and 4B. In this underfloor space UL, the cold air blown out from the air conditioner 3 (direction X1) flows in the longitudinal direction of the cold aisle space CA, and is shielded at a height t2 at a distance L from the air conditioner 3 in the cold air flow direction. A member 5 is provided.

  The shielding member 5 kills the momentum of the cold air blown down from the air conditioner 3 and generates a gentle flow of cold air. In the process of crossing the weir of the shielding member 5 (X2 direction), the flow of air is made gentle by killing the momentum of the cold air, and the gentle air flow is provided to the entire floor (X3 direction). It becomes possible to provide cold air with a uniform flow rate over the entire floor.

  The cold air that has flowed through the underfloor space UL is provided to the entire area of the cold aisle space CA through the air outlet 4a provided in the upper floor 4A (X4 direction).

  FIG. 3 shows the first embodiment of the shielding member. The illustrated shielding member 5 has an L shape in a side view and has a partition 5a that plays a role of a weir against the flow of cold air. The shielding member 5 has various formation materials such as metal materials such as aluminum, steel, and SUS, ceramics, and concrete.

  The height t2 of the shielding member 5 is lower than the height t1 of the underfloor space UL, and the height t2 is about ½ of the height t1, or is provided throughout the server rack room by various airflow simulations and experiments. It is preferable to set the height so that the air volume of the cool air is uniform, and it is set in consideration of the design flow rate or flow rate of the cool air.

  1 and 3, the width s2 of the shielding member 5 is preferably designed to be the same as the width s1 of the air conditioner 3 or wider than the width s1. In addition, the width s2 is smaller than the width s1 of the air conditioner 3 to form a divided structure, and the divided bodies are continuously installed to ensure a predetermined length (length in the width direction) and at the same time, one shielding member The division | segmentation body of 5 can also improve the ease of carrying in and the ease of position adjustment by becoming lightweight. In the illustrated example, the shielding member 5 wider than the width s1 of the air conditioner 3 is disposed in front of each air conditioner 3. However, each shielding member 5 wider than the illustrated example is used. The end portions of the shielding member may be brought into contact with each other, or the end portions of the shielding member 5 may be partially overlapped so that the shielding members 5 are arranged without a gap. In any case, the width s2 of the shielding member 5 is preferably set so that the cool air rectified through each shielding member 5 is provided to the entire area of the server rack chamber.

  As a specific example, the height t1 of the underfloor space is 1 m, the height t2 of the shielding member 5 is 500 mm, the separation L from the air conditioner 3 to the shielding member 5 is 1 m, and the double floor 4 and the shielding member 5 are installed. It can be configured and arranged.

  According to the server rack indoor system 10, since a simple configuration in which the shielding member 5 is simply installed at an appropriate place in the underfloor space UL is applied, the construction cost of the server rack room is not increased, and the scale of the server rack room is increased. Without increasing the size of the server rack room, it is possible to provide cold air in which the blowout amount is uniformly controlled as much as possible to the cold aisle space CA throughout the server rack room. The generation of hot spots is also effectively eliminated.

(Embodiment 2 of shielding member)
FIG. 4 is a diagram showing a second embodiment of the shielding member. The shielding member 5A shown in the figure is a laminate obtained by laminating a plurality of square steel materials 5b (C-type steel), and this laminate is fixed with two bolts and nuts 5c to form a partition. It is fixed to the support leg consisting of 5b and is configured as a whole.

  According to the shielding member 5A, since the general square steel material 5b is applied, the manufacturing cost of the shielding member 5A is low. Further, the height of the partition can be easily adjusted only by adjusting the number of stacked square steel members 5b.

(Embodiment 3 of shielding member)
FIG. 5 is a view showing Embodiment 3 of the shielding member. In the illustrated shielding member 5B, three movable blades 5e1, 5e2, and 5e3 are attached to a frame member 5d having support legs.

  The partition is provided with three movable blades 5e1, 5e2, 5e3 in the height direction thereof, and the angle θ1, θ2, θ3 of each movable blade 5e1, 5e2, 5e3 is adjusted appropriately (Y1 direction), so that it is gentle over the entire floor. It becomes easy to provide cold air with a uniform flow rate. Each angle can be adjusted to an optimum angle while manually adjusting the angles θ1, θ2, and θ3 of the movable blades 5e1, 5e2, and 5e3 so that the wind speed is uniform over the entire floor. Actually, prior to the start of the operation of the server rack indoor system 10, the angles θ1, θ2, and θ3 of the movable blades 5e1, 5e2, and 5e3 are experimentally changed at a plurality of locations in the server rack room in each case. Measure the amount of cold air blown out, identify the angles θ1, θ2, and θ3 at which the amount of cold air blown at each measurement point is as uniform as possible, and formally adjust the shielding member into the underfloor space UL Installed. Alternatively, an operator may enter the underfloor space UL for maintenance after the server rack indoor system 10 is used, and the angles θ1, θ2, and θ3 of the movable blades 5e1, 5e2, and 5e3 may be manually adjusted.

(Embodiment 4 of shielding member)
FIG. 6 is a view showing Embodiment 4 of the shielding member. The shielding member 5C shown in the drawing has a configuration in which three movable blades 5e1, 5e2, 5e3 are attached to a frame member 5d having support legs, and each movable blade 5e1, 5e2, 5e3 has its own servo. The angle is automatically controlled by the motors 5f1, 5f2, 5f3. This shielding member 5C is applied in the second and third embodiments of the server rack indoor system described below, and automatic angle control of each movable blade 5e1, 5e2, 5e3 will be described below.

(Embodiment 2 of server rack indoor system)
FIG. 7 is a plan view showing Embodiment 2 of the server rack indoor system of the present invention, and FIG. 8 is a view taken along arrows VIII-VIII in FIG.

  As shown in FIGS. 7 and 8, the server rack indoor system 10A has pressure sensors 6A, 6B, 6C, and 6D installed at a plurality of locations in the cold air flow direction, and further an angle control unit 7 installed. The rest of the configuration is the same as that of the server rack indoor system 10 shown in FIGS. 1 and 2 except that it is essential to apply the shielding member 5C shown in FIG.

  As shown in FIG. 8, the pressure sensor 6A and the like are composed of a pressure sensor 6A1 that measures the pressure in the upper space of the upper floor 4A and a pressure sensor 6A2 that measures the pressure in the underfloor space UL. Detection data from the corresponding pressure sensors 6A1 and 6A2 is transmitted to the angle control unit 7 (signal transmission of the detection data is in the U direction), and the differential pressure between the two detection data is calculated by the angle control unit 7. ing. The other pressure sensors 6B are similarly composed of pressure sensors 6B1 and 6B2 above and below the floor. The pressure sensor 6C is composed of pressure sensors 6C1 and 6C2 above and below the floor. It consists of a pressure sensor.

  The server rack indoor system 10A measures the differential pressure above and below the floor at multiple locations in the server rack room, and if there is a deviation in the differential pressure at each location, eliminates such differential pressure deviation at each location. This is intended to make the wind speed and the amount of blowout of the cold air uniform in each place. In the illustrated example, the angles θ1, θ2, and θ3 of the movable blades 5e1, 5e2, and 5e3 of the shielding member 5C are set based on a control signal from the angle control unit 7 so as to eliminate the deviation of the differential pressure at each location. To be adjusted.

  Although not shown in the figure, the angle control unit 7 is uniformly distributed over the entire floor of the detection data storage unit, differential pressure calculation unit, differential pressure deviation map storage unit at each measurement location, and each differential pressure deviation pattern. An optimal angle storage unit that stores the angle of each movable blade that can provide cool air at a flow rate, a CPU that performs execution control of each unit, ROM, RAM, etc. are connected via a bus so that data can be transmitted and received, and the control system is configured. .

  The angles θ1, θ2, and θ3 of the movable blades 5e1, 5e2, and 5e3 that can provide cold air at a uniform flow velocity over the entire floor according to the differential pressure above and below the floor are specified in advance, and this specified data Is stored in the angle control unit 7. In the illustrated example, detection data is transmitted to the angle control unit 7 from the pressure sensors 6A to 6D at the four places where the pressure sensors 6A to 6D are installed. The angle control unit 7 calculates the differential pressure above and below the floor at each location, and further calculates the deviation of the differential pressure at each location.

  The angle control unit 7 stores data relating to deviations of the four places where the pressure sensors 6A to 6D are installed. More specifically, based on the differential pressure above and below the floor in the pressure sensor 6A as a reference, the deviation pattern with respect to the reference value of the differential pressure above and below the floor in each of the pressure sensors 6B, 6C, 6D is when the pressure sensor 6B is +1 kPa. When the pressure sensor 6C is +2 kPa, the pressure sensor 6D is minus 3 kPa, the pressure sensor 6B is −4 kPa, the pressure sensor 6C is +3 kPa, and so on.

  The angles θ1, θ2 of the movable blades 5e1, 5e2, 5e3 of the shielding member 5C are made uniform so that the amount of cold air blown out at each location in the server rack chamber is uniform for each differential pressure deviation pattern at each measurement location. , Θ3 are changed in various ways, and an experiment for measuring the amount of blowout at each location is performed in advance, and the optimum angles θ1 ′, θ2 of the movable blades 5e1, 5e2, 5e3 of the shielding member 5C for each differential pressure deviation pattern. ', Θ3' is specified, and the specific data θ1 ', θ2', θ3 'are stored in the angle control unit 7.

  As described above, the angles θ1 ′, θ2 ′, and θ3 ′ of the movable blades 5e1, 5e2, and 5e3 of the optimal shielding member 5C are identified for each differential pressure deviation pattern in a plurality of locations in the server rack chamber. Based on the detection data received by the angle control unit 7, collation of the movable blade angle suitable for the differential pressure pattern at that time is executed, and each movable blade 5 e 1, 5 e 2, 5 e 3 is an optimum angle corresponding to the differential pressure pattern. Is transmitted to the servo motors 5f1, 5f2, 5f3 of the movable blades 5e1, 5e2, 5e3, and the angle adjustment of the movable blades 5e1, 5e2, 5e3 is automatically performed.

  According to the server rack indoor system 10A, the angles of the movable blades 5e1, 5e2, 5e3 of the respective shielding members 5C are automatically controlled as desired so as to eliminate the differential pressure deviations at a plurality of locations in the server rack room. Therefore, it is possible to respond to changes in the differential pressure in the server rack room and fluctuations in the differential pressure quickly and promptly, and to keep the amount of cool air blown out uniformly throughout the server rack room.

(Embodiment 3 of server rack indoor system)
FIG. 9 is a plan view showing Embodiment 3 of the server rack indoor system of the present invention.

  Unlike the server rack indoor system 10A shown in FIGS. 7 and 8, the server rack indoor system 10B shown in the figure has a running groove 8 on the double floor 4 (upper floor 4A) instead of installing pressure sensors at a plurality of locations. In addition, a traveling carriage is allowed to move along the traveling groove 8, and pressure sensors 6E for measuring the pressure above and below the floor are attached to the upper and lower sides of the traveling carriage.

  The traveling carriage is caused to travel along the traveling groove 8, and the pressure above and below the floor at a plurality of predetermined locations is measured in the process, and the detection data is transmitted to the angle control unit 7 (U direction). The angle adjustment of each movable blade 5e1, 5e2, 5e3 based on the angle control unit 7 is the same as that in the server rack indoor system 10A.

[Airflow simulation for setting the height of the screen of the shielding member and the separation between the air conditioner and the shielding member and its results]
The present inventors conducted an airflow simulation under the following conditions, and set the height of the screen of the shielding member and the separation between the air conditioner and the shielding member.

The server heat generation and number of units is 6kW / rack, 230 racks, the height of the underfloor space is 1m, the airflow of the air conditioner is 27000m ³ / hour 12 units, the exhaust heat fan attached to the server is 1130m ³ / Time / rack, and the opening ratio of the upper floor was 60%.

  Under these conditions, the airflow simulation was performed by changing the distance between the air conditioner and the shielding member to 300mm, 500mm, 1000mm, and 1500mm, and changing the height of the shielding member to 200mm, 300mm, 500mm, and 700mm. Then, it has been specified that the amount of cool air blown out uniformly throughout the server rack room when the distance and height are optimum among these various conditions.

[Consideration of the relationship between the angle of each movable blade of the shielding member with three movable blades and the speed of the cool air blown from the air conditioner]
The inventors of the present invention have tried to consider one relationship regarding the relationship between the angle of each movable blade of the shielding member provided with three movable blades and the air blowing speed of the cold air from the air conditioner.

  If each movable blade can move freely, that is, if it can move freely according to the flow rate of the cold air without being fixed at an arbitrary angle, the cold air will not collide with the movable blade. The wind speed of the blowout becomes small. From this, it is considered that the opening of the blade increases as it goes to the upper blade, the center blade, and the lower blade. The lower blade is considered to have a larger opening angle than the upper blade and the center blade in consideration of friction loss with the floor.

[Experiments and results of wind speed measurements at multiple measurement points in the server rack room with and without shielding members]
In order to verify the effect of the shielding member, the present inventors measured the distance from the measurement point 1 in the vicinity of the air conditioner up to the measurement point 28 at intervals of 600 mm in the case where the shielding member is installed in the space under the floor and in the case where it is not installed. An experiment was conducted to measure the wind speed at 28 locations. FIG. 10 shows the results of this experiment.

  In the case where there is no shielding member, the deviation of the wind speed at each measurement point is large, with a maximum deviation of 40%.

  On the other hand, in the case with a shielding member, the deviation is within 20% at the maximum, and it has been proved that the wind speed in each place is made uniform by the shielding member.

  The embodiment of the present invention has been described in detail with reference to the drawings. However, the specific configuration is not limited to this embodiment, and there are design changes and the like without departing from the gist of the present invention. They are also included in the present invention.

  DESCRIPTION OF SYMBOLS 1 ... Server rack, 2 ... Server rack row, 3 ... Air conditioner, 4 ... Double floor, 4A ... Upper floor, 4B ... Lower floor, 4a ... Outlet, 5, 5A, 5B, 5C ... Screening member, 5a ... Screen 5b ... Square steel material, 5c ... Fixed member (bolt nut), 5d ... Frame material, 5e1, 5e2, 5e3 ... Movable blade, 5f1, 5f2, 5f3 ... Servo motor, 6A, 6B, 6C, 6D, 6E ... Pressure sensor , 7: Angle control unit, 8: Running groove, 10, 10A, 10B ... Server rack indoor system, CA ... Cold aisle space, HA ... Hot aisle space, UL ... Under floor space

Claims (5)

A server rack row composed of two or more server racks is disposed on a floor provided with a blowout opening, and an underfloor space is provided below the floor,
In the server rack indoor system in which the air conditioner is in fluid communication with the underfloor space, and the cold air provided from the air conditioner to the underfloor space is provided to the server rack row through the air outlet,
A server rack indoor system in which a shielding member having a height lower than the height of the underfloor space is installed in the underfloor space.   The server rack indoor system according to claim 1, wherein the shielding member has a partition, and the partition includes a movable blade.   A pressure sensor that detects the pressure above and below the floor, and an angle control unit that receives detection data from each pressure sensor, calculates a differential pressure between the two, and adjusts the angle of the movable blade according to the differential pressure. The server rack indoor system according to claim 2.   A first differential pressure detection method in which a pressure sensor corresponding to the floor vertical position of each location is installed at a plurality of locations on the floor, or travel with a travel groove provided on the floor and a pressure sensor at each of the floor vertical locations 4. The server rack room according to claim 3, wherein any one of the second differential pressure detection methods for causing the carriage to travel is applied to detect the differential pressure above and below the floor. system.   The shielding member has a partition, and the partition is formed by fixing a laminated body formed by stacking square steel materials with a fixing member, and the height of the partition is adjusted by adjusting the number of stacked square steel materials. The server rack indoor system according to claim 1, wherein

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