JP2012190222A - Rack cabinet and air conditioning control method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a structure of a rack cabinet for mounting an electronic device, and an air conditioning control method using the rack cabinet.SOLUTION: The rack cabinet of this invention includes: a housing which mounts a plurality of electronic devices and has a front surface capable of sucking cold air from the outside at least; and a backflow prevention valve which is arranged on the side of the front surface of the housing to an electronic device mounting position, opened by being pushed by the sucked cold air in a first direction from the front surface to the electronic device, and closed in a second direction opposite to the first direction.

Description

  The present invention relates to a structure of a rack cabinet on which electronic equipment is mounted and an air conditioning control method using the rack cabinet.

  It is said that 30% of the power consumed in data centers and the like is consumed by the air conditioning system, and it is required to improve the efficiency of air conditioning. As a method for improving the efficiency of air conditioning, for example, a data center building is divided into an equipment installation space in which racks equipped with electronic devices are installed and an underfloor space in which cool air is sent from the air conditioner. It is known that a cold aisle and a hot aisle are formed by partitioning in a rack row composed of racks.

  The cold aisle is an area that blows cold air from the underfloor space to the front of the rack row via a grill that communicates the underfloor space and the equipment installation space, and the hot aisle is warmed by the heat generated by the electronic equipment, This is an area where warm air is exhausted from the back of the rack row. The exhausted warm air is returned to the air conditioner through an exhaust grill disposed in the upper part of the equipment installation space. In other words, the cool air sent from the air conditioner is sent to the space under the floor, blown out to the cold aisle in the equipment installation space through the grill, and sucked from the front of the rack to cool the electronic devices in the rack to become warm air and become the back of the rack The air is exhausted from the hot aisle to the air conditioner via the exhaust grille.

  Recently, in order to further improve the cooling efficiency, in order to prevent warm air from flowing from the hot aisle to the cold aisle, a capping is provided to separate the aisle between the top of the rack row and the ceiling, and the cold aisle and the hot aisle are separated. Certain division is performed. By providing the capping, the passage through which the cool air and the warm air flow is clearly separated, and heat loss due to the mixing thereof is reduced.

  As a related technology to increase the cooling efficiency, a louver that can change the angle of the blades is installed on the front of the rack in which multiple electronic devices are mounted in stages, and the louver angle is adjusted by measuring the temperature exhausted by the electronic device. It is known to change the amount of inflow to electronic equipment. By using this method, it is possible to obtain an appropriate amount of cool air inflow according to the difference in the amount of heat generated by the electronic devices in the rack, so that unnecessary cooling can be suppressed and cooling efficiency can be increased. .

  In addition, an optical fiber is laid in the rack, an optical pulse of a predetermined wavelength is propagated in the fiber, and the backscattered light (Raman scattered light) generated along with the propagation of the optical pulse is observed in time series, and the backward confusion It is known to obtain a temperature distribution in accordance with a light pulse capability propagation method from a change in light over time. By using this method, the exhaust temperature of the electronic equipment mounted in the rack can be known, and this exhaust temperature is used to optimize the cooling.

JP 2010-50220 A JP 2009-265077 A

  As described above, in data centers and the like, it is required to increase cooling efficiency, and various proposals have been made. However, in recent years, server virtualization and cloud technology have advanced, and a plurality of systems have been configured with a plurality of servers. Furthermore, these servers are also operated by changing the system configuration according to the amount of user access in the time zone. For example, during the daytime when there is a lot of user access, all servers that operate the system are operated to ensure usability, and during the time when the number of late-night accesses decreases, the system is reconfigured to reduce the number of servers. Is. By reducing the number of servers, it is possible to reduce power consumption of servers and air conditioners. For this reason, it has been common for servers to always operate, but in recent years, servers are frequently turned on and off.

  A plurality of servers are mounted in the rack, but if the servers are turned ON / OFF in the rack, a problem arises from the viewpoint of cooling efficiency. When all the servers in the rack are in the ON state, cool air is sucked in from the front of the server by the fan built in each server and warm air is exhausted from the back through the server. If an off server occurs), the front of the off server is under pressure due to the built-in fan of the on server (referred to as the on server) in the vicinity of the off server. A phenomenon occurs in which warm air exhausted by the ON server is sucked and blown out through the OFF server to the front of the server. That is, in the OFF server, the warm air flows from the back to the front, contrary to the normal case. Since the front surface of the OFF server is cold aisle, warm air blows out here and mixes with cold air, causing heat loss.

  In such a state, the ON server sucks warm air blown out from the front surface of the OFF server, and the ON server that detects this will increase the rotation speed of the built-in fan and attempt to cool it. Then, since the front surface of the OFF server becomes more attractive pressure, the warm air flowing in the OFF server increases, and a vicious cycle is caused.

  Even when the server is turned ON / OFF, the air conditioner is operating at an air volume and temperature that matches the state in which the server is fully operating, so it is useless when the load fluctuates and becomes lighter. There is also a problem here because energy is being used.

  The present invention has been made to solve the above-described problem. Even if there is an OFF server in the rack, the rack cabinet that prevents the backflow of warm air to increase the cooling efficiency, and the data center using the rack cabinet. It aims at providing the air-conditioning control method which raised the cooling efficiency of the whole apparatus accommodation room.

  According to one aspect of the present invention, a rack cabinet of the present invention is equipped with a plurality of electronic devices, a housing having a front surface capable of sucking cold air from the outside, and a housing position relative to the mounting position of the electronic devices. A backflow prevention valve that is disposed on the front surface side and is opened by being pushed by cold air sucked in a first direction from the front surface toward the electronic device and closed in a second direction opposite to the first direction; A rack cabinet is provided.

  According to another aspect of the invention, the air-conditioning control method of the present invention is configured to open a backflow prevention valve that is disposed in front of an electronic device mounted in a rack cabinet and opens and closes according to the intake air amount of a fan built in the electronic device. The electronic device intake air amount acquisition procedure for obtaining the intake air amount for each electronic device from the opening angle, the electronic device intake air temperature and the exhaust air temperature are measured, and the exhaust air temperature is determined based on the intake air temperature, the exhaust air temperature, and the intake air amount. Calculate the amount of heat for each electronic device, total the amount of heat exhausted from the electronic equipment mounted in the rack cabinet, and calculate the amount of exhaust heat for each rack cabinet, and the amount of exhaust heat calculated for each rack cabinet. And an air conditioner control procedure for controlling the output of the air conditioner based on the calculated total exhaust heat amount.

  A backflow prevention valve is installed on the front of the electronic equipment mounted in the rack cabinet, and when there is a stopped electronic equipment, the warm air that flows back in the electronic equipment can be shut off, and the warm air is not mixed with the cold air. Can provide rack cabinet.

It is a figure which shows the example of an air conditioning of a general data center. It is a figure which shows the warm air recirculation | reflux example of an OFF server. It is a figure which shows the structural example of the server rack of this invention. It is a figure which shows the structural example of the backflow prevention valve and duct of this invention. It is a figure which shows the structural example of a backflow prevention valve. It is a figure which shows the example of installation of a backflow prevention valve. It is a figure which shows the example of opening angle sensing of the backflow prevention valve by a strain gauge. It is a figure which shows the example of a server rack provided with the backflow prevention valve with an angle sensor. It is a figure which shows the structural example of an air-conditioning control apparatus. It is a figure which shows the example of data of a memory | storage part. It is a figure which shows the example of a correspondence of a server rack and a grill. It is a figure which shows the example of control flow of an air-conditioning control apparatus.

  Before describing the embodiment of the present invention, a general method of air conditioning in the above-described data center or the like will be described. FIG. 1 is a diagram showing the flow of cool air and warm air for server racks arranged in a data center or the like. The building of the data center 10 sucks warm air exhausted from the equipment installation space 20 in which the server rack 50 is disposed, an underfloor space 30 into which cool air is sent from an air conditioner (not shown), and the server rack 50 is exhausted, and is returned to the air conditioner. The space 40 is divided into three spaces. The underfloor space 30 and the equipment installation space 20 communicate with each other through a grill 31, and the equipment installation space 20 and the exhaust space 40 communicate with each other through an exhaust grille 41. For this reason, the cold air in the underfloor space 30 flows into the device installation space 20, and the air in the device installation space 20 flows into the exhaust space 40.

  A single server rack 50 is equipped with a plurality of servers. Each server has a fan inside, and sucks cool air from the front and exhausts warm air from the back. A plurality of these server racks 50 are connected to form a rack row 51, and several rack rows 51 are arranged in the equipment installation space 20. At this time, for example, when arranging two rows of rack rows, the two rows of rack rows 51 are arranged so that the front surfaces thereof face each other as shown in FIG. By arranging in this way, the cool air from the underfloor space 30 blows out through the grill 31 to the area in front of the rack row 51, so that each rack row 51 can suck the cold air from the front. The sucked cold air passes through the inside of the rack row 51, where heat is exchanged to become warm air, exhausted from the back, and further sucked into the exhaust space 40 through the exhaust grille 41 (the white area in FIG. 1). The arrow indicates the flow of cold air, and the black arrow indicates the flow of warm air).

  In order to prevent mixing loss due to mixing of cool air and warm air in the upper space of the rack row 51, a capping 23 for partitioning the upper surface of the rack row 51 and the ceiling of the equipment installation space 20 is also provided. . The area where the front side of the rack row 51 faces is called the cold aisle 21, and the area on the back side is called the hot aisle 22.

  Next, the warm air recirculation of the OFF server described above will be described with reference to FIG. FIG. 2 is a diagram showing the flow of cool air and warm air for the server 60 mounted in the server rack 50. Like FIG. 1, cold air is indicated by white arrows and warm air is indicated by black arrows. Further, the right side of the server rack 50 shown in the drawing faces the cold aisle 21 at the front, and the left side of the server rack 50 faces the hot aisle 22 at the back. The server rack 50 is equipped with five servers from the server 1 to the server 5, and the servers 1, 2, 4, 5 are in an operating state (ie, an ON server), but the server 3 is in an OFF state (ie OFF server). In such a state, the ON server sucks cool air from the front and exhausts warm air to the back. The fan built in the server 3, which is an OFF server, is stopped and is not taking in cool air. As the server 2 and the server 4 positioned above and below the server 3 suck in cool air from the front, the front of the server 3 is pulled down, and the server 3 sucks warm air from the back and exhausts warm air to the front. For this reason, a part of the warm air exhausted from the front surface of the server 3 is sucked into the server 2 and the server 4 together with the cool air, and the temperature of the cool air sucked in by the server 2 and the server 4 rises. Since the server includes a mechanism that detects the temperature of the intake air and changes the rotation speed of the fan, the server 2 and the server 4 try to increase the intake air volume by increasing the rotation speed of the fan. Along with this, a larger amount of warm air from the server 3 is sucked in, resulting in a vicious circle.

  Next, examples of the present invention will be described. In the embodiment, an example in which a “server” is mounted in a “server rack” will be described. These correspond to the “rack cabinet” and the “electronic device” described above, respectively.

Example 1
In the first embodiment, a backflow prevention valve is provided on the front surface of the server, and warm air is prevented from being exhausted from the front surface of the server that has been turned off (that is, warm air recirculation). FIG. 3 is a diagram showing the flow of cool air and warm air in the server rack 100 as in FIG. 2, where cool air is indicated by white arrows and warm air is indicated by black arrows. The server rack 100 is equipped with five servers from server 1 to server 5 as in FIG. 2, and servers 1, 2, 4, and 5 are ON servers, and server 3 is an OFF server. The height of the servers 1 to 3 is 2U (units), the servers 4 and 5 are 1U, and the server rack 100 can further mount two units of servers, but here it is not mounted (blank). is there.

  A backflow prevention valve 200 is provided on the front surface (right side in FIG. 3) of the server rack 100. The backflow prevention valve 200 has a structure that opens to the left but does not open to the right (details will be described later). Further, the backflow prevention valve 200 and the server 400 are connected by a duct 300. Further, the front surface of the server 400 connected to the duct 300 is provided with a duct connecting member 301 according to the size of the unit so that no gap is generated. Here, the front of the server rack is a surface corresponding to the front of the electronic device mounted on the server rack. The electronic device uses a built-in fan to draw in cool air from the front of the electronic device and exhaust it to the back. The rack also draws cool air from the front and exhausts it to the back.

  The backflow prevention valve 200 causes the cool air outside the server rack 100 to push open the backflow prevention valve 200 by the fan built in the server 400 (will open to the left), so that the cool air flows into the server 400 through the duct 300. It has become. The backflow prevention valve 200 of the ON server in FIG. 3 shows an open state. On the other hand, the backflow prevention valve 200 on the front surface of the server 3 which is an OFF server is closed. The front side of the server 3 has a suction pressure due to the cold air suction of the server 2 and the server 4 and tries to suck warm air toward the front side through the inside of the server 3, but the backflow prevention valve 200 is closed because it does not open in the right direction. The warm air is not drawn from the back of the server 3. Therefore, since warm air does not blow out from the server 3, the server 2 and the server 4 that have been seen in the past do not suck warm air and the cooling efficiency does not decrease.

  Next, structural examples of the backflow prevention valve 200 and the duct 300 will be described with reference to FIG. The left drawing of FIG. 4A shows the external appearance of the 1U size server 400, and the front surface of the server 400 shows a state in which a duct connecting member 301 connected to the duct 300 is attached. The diagram on the right side of FIG. 4A shows the duct 300 and the backflow prevention valve 200 attached to the duct 300. As shown in the figure, a plurality of check valves 200 are attached in two stages on the opening side in front of the duct 300. Although hidden in FIG. 4A, a horizontal partition plate that divides the inside of the duct 300 into two upper and lower stages is provided corresponding to the arrangement of the two-stage backflow prevention valve 200. A stopper 210 shown in FIG. 4A is provided on the front face of the partition plate and the lower plate of the duct 300 so that the backflow prevention valve 200 does not open to the right.

  The shape of the backflow prevention valve 200 is shown in FIG. 5 and is formed of a flat plate portion 201 and a curved portion 202. A beam 203 stretched in the longitudinal direction of the duct 300 passes through the curved portion 202. The backflow prevention valve 200 attached to the beam 203 is suspended from the beam 203 and is freely rotatable about the beam 203 as an axis. Since the backflow prevention valve 200 is pushed by cold air and rotates and opens, it needs to be lightweight. For this reason, plastic or aluminum having a thickness of 0.1 to 0.5 mm is used.

  Returning to FIG. 4, the state where the backflow prevention valve 200 is attached to the server 400 is shown in FIGS. 4 (b) and 4 (c). FIG. 4B shows an example when the server 400 is an ON server. Cold air is sucked in by a fan built in the server 400, and the backflow prevention valve 200 is pushed by the cold air to open inside the duct 300. It shows the state. On the other hand, FIG. 4C shows an example when the server 400 is an OFF server, and the backflow prevention valve 200 is closed as described above.

  Next, the external appearance of the server rack 100 provided with the backflow prevention valve 200 is shown in FIG. The server rack 100 has a front door 120, and a duct 300 having a backflow prevention valve 200 is attached to the front door 120. The front door 120 is connected to the housing body 110 via a hinge 130 and can be opened. FIG. 6A shows a state in which the front door 120 is closed as seen from the front. A central portion of the front door 120 is a backflow prevention valve 200. FIG. 6B is a view showing a state in which the front door 120 is opened. The right side shows the front door 120 including the duct 300 and the backflow prevention valve 200, and the left side shows the housing main body 110 on which the server 400 is mounted. ing. A blank panel 500 is attached to a portion where the server 400 is not mounted.

(Example 2)
In the first embodiment, an example of a server rack having a backflow prevention valve is shown. In the second embodiment, a method for performing air conditioning control of a data center by attaching an angle sensor to the backflow prevention valve of the server rack will be described. .

  The air conditioning control of the present invention calculates the amount of exhaust heat for each server rack based on the angle sensor of the backflow prevention valve, controls the air conditioner to an output commensurate with the amount of exhaust heat of the entire server rack, and controls the opening amount of the grill Thus, cool air corresponding to the amount of heat exhausted from the server rack is supplied to each server rack.

  First, the backflow prevention valve 600 provided with the angle sensor 630 will be described with reference to FIG. The angle sensor 630 measures the opening angle of the check valve 600 and obtains the intake air amount of the server based on the measured angle. Unlike the first embodiment, the backflow prevention valve 600 is a unit provided with a beam 621. As shown in the left diagram of FIG. 7A, a flat plate portion 610, a beam support portion 620, And an angle sensor 630. The upper part of the flat plate part 610 is connected to a curved part 611 through which the beam 621 passes, and is supported by the beam support part 620 via the beam 621. As shown in the left and right views of FIG. 7A (the right view is a view showing the AA ′ cross section of the left view), the angle sensor 630 has a lower end portion as a flat plate portion 610. It is disposed so as to engage with the flat plate portion 610 and extend upward through the pressing member 622. The upper end of the angle sensor 630 is fixed to a support member (not shown).

  The angle sensor 630 includes a strain gauge 631 and a traction band 632. The strain gauge 631 is formed on a thin plastic and is connected to the traction band 632. The traction band 632 is also formed of a thin plastic and has a band shape. As shown in FIG. 7 (b), the sensing of the opening angle is performed when the backflow prevention valve 600 is closed (left figure) and is opened by the cold air at an angle θ (right figure). The traction band 632 acts in the direction in which the strain gauge 631 is pulled, and the opening angle θ can be obtained by measuring the change in the electrical resistance of the strain gauge 631.

  Next, an example in which the backflow prevention valve 600 is attached to the front door 120 of the server rack is shown in FIG. The angle sensors 630 of all the backflow prevention valves 600 are connected to an angle measurement circuit 700, and the angle measurement circuit 700 is connected to an input / output control unit of an air conditioning control device described later. In order to show the state of the wiring connected to the angle sensor 630 and the angle measuring circuit 700, the backflow prevention valve 600 is drawn small in FIG. 8, but when viewed from the front, the wiring is hidden behind the backflow prevention valve 600 and cannot be seen.

  Next, a configuration example of an air conditioning control device 800 that acquires data on the opening angle of the backflow prevention valve 600 from the angle sensor 630 and controls the air conditioner and the grill will be described with reference to FIG. The air conditioning control device 800 executes a main control unit 810 that performs overall control, an input control unit 820 that transmits data such as the backflow prevention valve opening angle data, and the like, and an air conditioning control program 840. It includes a memory 830, a rack exhaust heat amount storage unit 850 that stores the exhaust heat amount for each server rack, and a grill louver angle storage unit 860 that stores the angle of the louver that controls the opening amount of the grill.

  The air conditioning control program 840 further includes a server intake amount acquisition unit 841, a rack exhaust heat amount calculation unit 842, an air conditioner control unit 843, and a grill control unit 844. An outline of these individual functions will be described next.

  The server intake amount acquisition unit 841 acquires angle data of the angle sensors 630 installed in all the backflow prevention valves 600 from the angle measurement circuit 700 via the input / output control unit 820 (see FIG. 8). The acquired angle data is converted into an intake air amount, and an intake air amount for each server is obtained (a cool air flow rate with respect to the opening angle is obtained in advance, and the front area of the backflow prevention valve and the number of backflow prevention valves per server are calculated as one server. Can be obtained).

  The rack exhaust heat amount calculation unit 842 acquires intake air temperature and exhaust temperature data for each server. The intake air temperature of the server is acquired via the input / output control unit 820 since the server includes a temperature sensor and controls the rotational speed of the fan. Further, the exhaust temperature of the server is obtained by a method of observing the backscattered light using the above-described fiber. That is, a fiber is laid on the back of each server rack, and backscattered light generated by propagating an optical pulse through the fiber is observed in time series to determine the exhaust temperature of each server. Exhaust temperature data is also acquired via the input / output control unit 820. The amount of exhaust heat for each server is obtained based on the intake air temperature, the exhaust gas temperature, and the intake air amount thus obtained. Further, the amount of heat exhausted from the servers mounted in the server rack is totaled to obtain the amount of heat exhausted for each server rack.

  The air conditioner control unit 843 calculates the total exhaust heat amount of the entire server rack by adding up the exhaust heat amounts for each server rack calculated by the rack exhaust heat amount calculation unit 842. Information including this total exhaust heat amount is sent to the air conditioner via the input / output control 820.

  The grill control unit 844 calculates a ratio of the exhaust heat amount for each server rack to the total exhaust heat amount of the entire server rack obtained by the air conditioner control unit 843. The angle of the louver that controls the opening amount of the grille corresponding to the server rack is obtained based on this exhaust heat amount ratio, and this angle information is sent to the grille via the input / output control 820.

  Note that the air conditioner and the grill are compatible with, for example, BACnet (Building Automation and Control Networking protocol), and the air conditioning control device 800 transmits control information to the air conditioner and the grill via the BACnet.

  Next, data examples of the rack exhaust heat amount storage unit 850 and the grill louver angle storage unit 860 will be described. 10A shows an example of data stored in the rack exhaust heat amount storage unit 850. The rack exhaust heat amount storage unit 850 includes “rack No.”, “server No.”, “server exhaust heat amount”, “server intake air amount”, Each field includes “server intake temperature” and “server exhaust temperature” fields. “Rack No.” is a number (symbol) for identifying the server rack 100, and “Server No.” is a number for identifying the server 400 mounted on the server rack 100. For example, the server rack 100 of “R01” includes the servers 400 of “S0101”, “S0102”. The “server exhaust heat amount” is calculated based on the values of “server intake amount”, “server intake temperature”, and “server exhaust temperature” (a calculation method will be described later). The “server intake air amount” is a value obtained by converting the angle data of the angle sensor 630 of the check valve 600 acquired via the input / output control unit 820 into the intake air amount. Since one server 400 includes a plurality of backflow prevention valves 600, it is the total value of the intake air amount obtained from these angles. “Server intake temperature” and “server exhaust temperature” are also data acquired via the input / output control unit 820 by the method described above.

  FIG. 10B shows an example of data in the grill louver angle storage unit 860. The grill louver angle storage unit 860 includes “grill No.”, “rack No.”, “louver angle”, “rack heat amount”, and Each field includes “rack heat ratio”.

  “Grill No.” is a number for identifying the grill 32 and corresponds to “rack No.”. A correspondence example between the grill 32 and the server rack 100 will be described with reference to FIG. In FIG. 11, the server rack 100 arranged in the data center forms one rack row with five server racks 100, and here, two rack rows are shown. The area facing the front of the rack row is a cold aisle 21, and the back area is a hot aisle 22. As described above, the cold aisle 21 and the hot aisle 22 are partitioned by the capping 23. A grill 32 is disposed on the cold aisle 21 and corresponds to the server rack 100 as shown in the figure. For example, a “G01” grill 32 corresponds to the “R01” server rack 100, and a “G02” grill 32 corresponds to the “R02” server rack 100. Each grill 32 is provided with a louver capable of controlling the angle of opening, and is controlled by an air conditioner control device 800. Changing the opening amount of the grill 32 also means changing the amount of air blown from the grill 32.

  Returning to FIG. 10B, the data of the louver angle of the grill 32 to be controlled is stored in the “louver angle”, and the value of this data is determined by the value of the “rack heat amount ratio”. That is, the air volume shared by each grill 32 is the air volume that is obtained by dividing the total air volume sent from the air conditioner by the rack exhaust heat ratio. By doing in this way, many airflows can be supplied with respect to the server rack 100 of high exhaust heat amount. The control angle may be 90 ° for the louver angle with respect to the value with the largest exhaust heat rate ratio, and the other exhaust heat rate ratio may be an angle proportional to this (the louver angle of 0 ° is 0% of the opening ratio of the grill). 90 ° is assumed to be 100%).

  The “rack exhaust heat amount” stores a value obtained by summing the exhaust heat amount of each server 400 mounted on the server rack 100 obtained by the rack exhaust heat amount storage unit 850. The “rack exhaust heat amount ratio” is the ratio of the exhaust heat amount of each server rack 100 to the total exhaust heat amount of the server rack 100.

  Next, a processing flow example of the air conditioning control device 800 will be described with reference to FIG.

  In FIG. 12, first, the air conditioning control device 800 acquires opening angle data from the angle sensors 630 of all the backflow prevention valves 600 via the input / output control unit 820. Since the opening angle of the backflow prevention valve 600 with respect to the intake air amount varies depending on the size and weight of the backflow prevention valve 600, the relationship between the opening angle and the intake air amount is obtained in advance. Based on this, the intake air amount is converted from the acquired angle data. Since one server 400 has a plurality of backflow prevention valves 600, the intake air amount of the server 400 is the sum of the intake air amounts obtained from the angle sensors 600 of the backflow prevention valves 600 (S1). .

  Subsequently, the air conditioning control device 800 acquires intake air temperature data from a temperature sensor built in each server 400. Further, the exhaust temperature data of each server 400 is acquired from the fiber laid on the back surface of the server rack 100 (S2, S3).

  The amount of exhaust heat of the server 400 is calculated based on the intake air amount obtained in S1, and the intake air temperature and exhaust temperature obtained in S2 and S3. The exhaust heat amount P [W] per server may be obtained by multiplying the air heat capacity C [J / m3 · ° C.] by the intake air amount Q [m3 / s] and the intake / exhaust temperature difference ΔT [° C.]. . That is, it is obtained by the following equation.

P = C × Q × ΔT
Next, the amount of heat exhausted from the servers 400 mounted on the server rack 100 is summed to obtain the amount of heat exhausted for each server rack 100. The heat capacity C of air is air density x air specific heat, air density is 1,205 [kg / m3] (at 20 ° C), and air specific heat is 1,006 [J / kg · ° C] (at30 ° C) ( S4, S5).

  Further, the total amount of exhaust heat for each server rack (total exhaust heat amount) is obtained. The air conditioner may be operated with an output that recovers the total amount of exhaust heat at a minimum. Considering the amount of exhaust heat other than the amount of exhaust heat from the server rack 100 (for example, lighting of the data center), if the total exhaust heat amount of the data center is Ptotal, the airflow rate Aair of the air conditioner is obtained by the following equation.

Qair = Ptotal / (C × (T2-T1))
Here, T1 is the set temperature of the air conditioner, and T2 is the recovered air temperature of the air conditioner. The air conditioning control device 800 transmits this Ptotal information as control information to the air conditioner. The air conditioner that has received the control information operates with the above-described air flow rate based on the total exhaust heat amount specified in the control information (S6).

  Subsequently, an exhaust heat amount ratio for each server rack 100 with respect to the total exhaust heat amount is obtained, and a louver angle of the grille 32 corresponding to the server rack 100 is calculated based on the exhaust heat amount ratio. This angle information is transmitted to the grill 32 as control information. The grill 32 that has received the control information controls the louver angle at an angle designated by the control information (S7, S8).

  Although the angle sensor 630 described so far uses a strain gauge, a rotor encoder may be used as the angle sensor.

  As described above, providing the angle sensor for detecting the opening angle in the check valve and measuring the opening angle is to obtain the intake amount for each server. In addition, providing temperature sensors in the server and on the back of the server to measure the intake and exhaust temperatures is to determine the amount of exhaust heat for each server based on the measured temperature and the intake air amount of the server previously obtained. . If the amount of exhaust heat for each server is obtained, the amount of exhaust heat for each server rack can be obtained by adding them, and cool air proportional to the amount of exhaust heat for each server rack can be supplied by controlling the louver angle. In this way, while preventing the backflow of warm air from the OFF server, it is possible to supply cool air corresponding to the amount of exhaust heat of each server rack, and to provide an air conditioning control method with improved cooling efficiency. .

  As mentioned above, although the Example of the rack cabinet of this invention and the air-conditioning control method using this rack cabinet was demonstrated, these are not limited to above content, Various aspects in the range which does not deviate from the summary of this invention. Can be implemented.

DESCRIPTION OF SYMBOLS 10 Data center 20 Equipment installation space 21 Cold aisle 22 Hot aisle 23 Capping 30 Underfloor space 31 Grill 32 Grill 40 Exhaust space 41 Exhaust grill 50 Server rack 51 Rack row 60 Server 100 Server rack 110 Case body 120 Front door 130 Hinge 200 Backflow Prevention valve 201 Flat plate portion 202 Bending portion 203 Beam 210 Stopper 300 Duct 301 Duct connection member 400 Server 500 Blank panel 600 Backflow prevention valve 610 Flat plate portion 611 Bending portion 620 Beam support portion 621 Beam 622 Holding member 630 Angle sensor 631 Strain gauge 632 Towing Band 700 Angle measurement circuit 800 Air conditioning control device 810 Main control unit 820 Input / output control unit 830 Main memory 840 Air conditioning control program 841 Server Air amount acquisition unit 842 rack waste heat calculator 843 air conditioner controller 844 grille controller 850 rack waste heat storage unit 860 grill louver angle storage unit

Claims (5)

A housing having a plurality of electronic devices and having a front surface capable of sucking cold air from the outside,
The electronic device is disposed on the front side of the housing with respect to the mounting position of the electronic device, and is released by being pushed by the cold air sucked in the first direction from the front surface toward the electronic device. A check valve that closes against the opposite second direction;
A rack cabinet comprising: The rack cabinet further includes:
The rack cabinet according to claim 1, further comprising a duct connecting the backflow prevention valve and the electronic device. The opening angle of the backflow prevention valve, which is arranged in front of the electronic device mounted in the rack cabinet and opens and closes according to the intake amount of the fan built in the electronic device, is measured, and the intake amount for each electronic device is determined from the opening angle. The electronic equipment intake volume acquisition procedure that we want,
The intake air temperature and exhaust temperature of the electronic device are measured, and the amount of exhaust heat is determined for each electronic device based on the intake air temperature, the exhaust temperature and the intake air amount, and the exhaust of the electronic device mounted in the rack cabinet is obtained. A rack exhaust heat amount calculation procedure for calculating the exhaust heat amount for each rack cabinet by counting the heat amount,
An air conditioner control procedure comprising: summing up the amount of exhaust heat calculated for each rack cabinet to calculate the total amount of exhaust heat, and controlling the output of the air conditioner based on the calculated total amount of exhaust heat Method. The air conditioning control method further calculates, for each rack cabinet, an exhaust heat amount ratio of the exhaust heat amount of the rack cabinet to the total exhaust heat amount, and cool air corresponding to the rack cabinet is calculated based on the calculated exhaust heat amount ratio. The air conditioning control method according to claim 3, further comprising: a grill control procedure for controlling an opening angle of the supplied grill. The measurement of the opening angle of the backflow prevention valve in the electronic device intake air amount acquisition procedure is measured by a strain gauge installed on the backflow prevention valve or a rotary encoder. The air-conditioning control method according to item.

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