JP2017134677A - Computer room air conditioning system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a computer room air conditioning system capable of appropriately controlling an air volume of an air conditioning system according to an opening degree of a pressure regulation damper and reducing frequency of maintenance.SOLUTION: The computer room air conditioning system includes an upper-part shielding body 10 that covers an upper part of a passage 4 facing an air intake surface 3b of a storage rack 3 to delimit a distribution part of a cooling air and a distribution part of a hot air. The upper-part shielding body 10 includes an opening part 13 for communicating the inside/outside of the passage 4, and a pressure regulation damper 16 opening the opening part 13 according to a pressure difference between the inside/outside the passage 4 to reduce the pressure difference between the inside/outside. A temperature detection part such as a temperature sensor 19 is provided in the vicinity of the opening part 13 outside the passage 4. The air conditioning device 6 controls a blowing amount to the passage 4 on the basis of the detection temperature of the temperature detection part.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a computer room air conditioning system for a computer room in which a plurality of storage racks for storing various devices such as electronic computers are arranged.

  In the computer room, devices such as electronic computers, information devices, and communication devices are housed in a plurality of housing racks and arranged in a highly integrated manner. And although the apparatus accommodated in each accommodation rack emits heat at the time of use, it is necessary to keep the operating temperature low in order to obtain the stable operation | movement of an apparatus.

For example, in a computer room where a plurality of devices are installed in a storage rack, the cooling air of the air conditioner is blown out to a passage on the front side of the storage rack.
The computer room air conditioning system employed here is provided with an intake surface for taking in cooling air on the front side of each storage rack that accommodates equipment, and is heated on the back side or top surface side of each storage rack. An exhaust surface for exhausting hot air to the outside is provided. In the computer room, a plurality of storage racks are arranged with the intake surfaces facing each other across the passage, and the cooling air blown out from the air conditioner is supplied to each storage rack through the passage between the racks. . And the air (heated air) heated by cooling the equipment in each storage rack is returned again to the air inlet of the air conditioner.

  In this type of computer room air conditioning system, in order to efficiently cool the equipment in the storage rack without causing hot air to wrap around the intake surface, the space between the storage racks on both sides of the path is the upper part of the passage. And an end shield covering the end of the passage. In addition, each housing rack is provided with a heat radiating fan on the back side or the top side in order to cool the equipment and release heated hot air to the outside.

  Also, in this type of computer room air conditioning system, in order to prevent the heat on the exhaust heat side from entering the cooling side passage through the gaps between the parts, the air supply capacity of the air conditioner is the exhaust of the exhaust heat fan of the storage rack. It is set slightly higher than the capacity. However, if the amount of air blown from the air conditioner supplied to the passage may greatly exceed the amount of exhaust heat from the radiating fan on the housing rack side for some reason, the pressure difference between the inside and outside of the passage will increase. There is a concern that a large load acts on the shielding body and the exhaust fan covering the periphery of the passage.

Therefore, as a computer room air conditioning system that can cope with this, the upper shield covering the upper part of the passage on the cold air introduction side between the accommodation racks, the opening communicating the inside and outside of the passage, and the pressure difference between the inside and outside of the passage Accordingly, there has been devised one provided with a pressure-reducing damper that opens and closes the opening. In this computer room air conditioning system, when the pressure in the passage on the cold air introduction side between the storage racks is significantly higher than the pressure on the exhaust side of the storage rack, the pressure avoidance damper opens the opening, thereby Reduce the pressure in the passage.
Furthermore, as this kind of computer room air conditioning system, a contact switch is provided between the pressure-proof damper and the opening, and the contact of the contact switch is connected to the air volume control unit of the air conditioner through the detection circuit. Has been devised. In this computer room air conditioning system, when the pressure difference inside and outside the passage on the cold air introduction side becomes large and the pressure avoidance damper opens the opening, a detection signal is sent from the contact switch to the air volume control unit, and the air volume control unit In response to the signal, the amount of air blown from the air conditioner to the passage is reduced (see, for example, Patent Document 1).

JP 2014-197244 A

  In the above conventional computer room air conditioning system, it is possible to detect that the pressure-proof damper opens the opening by the contact switch, and to reduce the amount of air blown from the air conditioner to the passage based on the detection result. However, since the contact switch outputs an ON or OFF signal depending on whether or not the contact is in contact, it is not possible to easily detect the degree of opening of the pressure relief damper with respect to the opening portion. Contact tends to deteriorate with use. For this reason, in the conventional computer room air conditioning system, in order to appropriately control the amount of air blown from the air conditioner according to the degree of opening of the pressure-proof damper, it is necessary to provide a plurality of contact switches. The configuration becomes complicated. Further, in order to improve the reliability of the detection result of the contact switch, the contact switch must be frequently maintained.

  Therefore, the present invention intends to provide a computer room air conditioning system capable of appropriately controlling the air volume of the air conditioner according to the degree of opening of the pressure-proof damper and reducing the frequency of maintenance. It is.

The computer room air conditioning system according to the present invention employs the following configuration in order to solve the above problems.
A plurality of storage racks having an air intake surface for receiving the cooling air and an exhaust surface for exhausting the heated hot air; an air conditioner for sucking the heated air and sending the cooling air; An upper shield that covers an upper portion of the passage facing the air intake surface of the rack and separates the circulation portion of the cooling air and the circulation portion of the hot air, and communicates the inside and outside of the passage with the upper shield. An opening and a pressure avoidance damper that reduces the pressure difference between the inside and the outside by opening the opening according to a pressure difference between the inside and outside of the passage are provided, and in the vicinity of the opening outside the passage Is provided with a temperature detector, and the air conditioner controls the air flow rate to the passage based on the temperature detected by the temperature detector.

  With the above configuration, when the pressure difference between the inside and outside of the passage into which the cooling air is introduced increases, the pressure avoidance damper opens the opening of the upper shielding body so that a part of the cooling air in the passage escapes to the outside through the opening. become. As a result, the air exhausted to the outside through the opening reduces the temperature in the vicinity of the temperature detection unit in accordance with the degree of opening of the pressure-proof damper, and the reduced temperature is detected by the temperature detection unit. The air conditioner controls the amount of air blown to the passage based on the temperature detected by the temperature detector at this time.

The air conditioner may control the air volume based on the temperature detected by the temperature detector so that the air volume decreases as the detected temperature decreases.
In this case, when the detected temperature of the temperature detection unit decreases with an increase in the degree of opening of the pressure avoidance damper, the air conditioner decreases the amount of air blown according to the degree of opening of the pressure avoidance damper.

The air conditioner sends the air volume such that the air volume decreases as the temperature difference between the temperature upstream of the opening of the circulating portion of the hot air and the detected temperature increases, based on the temperature detected by the temperature detector. The air volume may be controlled.
In this case, if the temperature difference between the temperature upstream of the opening of the hot air circulation portion and the detected temperature increases with the increase in the degree of opening of the pressure avoidance damper, the air conditioner opens the pressure avoidance damper. The air flow is reduced according to the degree.

The air conditioner may control the air volume based on the temperature detected by the temperature detector so that the air volume decreases as the temperature difference between the detected temperature and the temperature in the passage decreases.
In this case, when the temperature difference between the detected temperature and the temperature in the passage decreases with an increase in the degree of opening of the pressure avoidance damper, the air conditioner seems to decrease the amount of air blown according to the degree of opening of the pressure avoidance damper. become.

The temperature detection unit may share a processing circuit with a feedback temperature detection unit that detects the temperature of at least one of the suction side and the discharge side of the air conditioner and feeds back to the air conditioning control unit.
In this case, since the temperature detection unit provided in the vicinity of the opening shares the processing circuit with the feedback temperature detection unit, the equipment cost can be reduced.

The air conditioning apparatus includes a plurality of apparatus main body blocks each having a compressor and a blower fan, and the controller controls operations of the plurality of apparatus main body blocks. May stop the operation of any of the apparatus main body blocks based on the temperature detected by the temperature detection unit.
In this case, when the pressure difference between the inside and outside of the passage increases and the pressure avoidance damper opens the opening of the upper shield, the controller stops the operation of one of the device body blocks based on the temperature detected by the temperature detection unit. By doing so, the air volume of the cooling air introduced into the passage is reduced.

When the controller determines that the opening is open based on the temperature detected by the temperature detection unit in a situation where all the device main body blocks are controlled to blow with a minimum air volume near the air volume, The operation of the apparatus main body block may be stopped.
In this case, even if the air volume of each apparatus main body block is a near air volume of the minimum air volume, the air volume of the cooling air introduced into the passage is reduced by stopping the operation of any of the apparatus main body blocks. Is possible.

The controller, when stopping the operation of any of the apparatus main body blocks based on the temperature detected by the temperature detection unit, preferentially stops the operation from the apparatus main body block having a current low cooling capacity. May be.
In this case, since the operation is stopped in preference to the current apparatus main body block having a low cooling capacity, it becomes possible to reduce the air volume of the cooling air while minimizing a decrease in the cooling capacity of the entire apparatus main body block. .

When the controller stops the operation of any of the apparatus main body blocks based on the temperature detected by the temperature detection section, the path length from the apparatus main body block to the cooling air introduction section of the passage becomes longer. The operation may be stopped with priority.
In this case, since the operation is stopped preferentially from the apparatus main body block in which the path length to the cooling air introduction part in the passage becomes long, the decrease in the cooling capacity of the cooling air introduced into the cooling air introduction part in the passage is minimized. It is possible to reduce the air volume of the cooling air while limiting to the limit.

The air conditioning apparatus includes a plurality of apparatus main body blocks each having a compressor and a blower fan, and the controller controls operations of the plurality of apparatus main body blocks. May be configured to further reduce the air volume of the blower fan of the apparatus body block after stopping the operation of the compressor of any of the apparatus body blocks based on the temperature detected by the temperature detection unit.
In this case, when the pressure difference between the inside and outside of the passage becomes large and the pressure avoidance damper opens the opening of the upper shield, the controller operates the compressor of one of the apparatus body blocks based on the temperature detected by the temperature detecting unit. It is possible to further reduce the air volume of the cooling air introduced into the passage by further reducing the air volume of the blower fan of the apparatus body block after stopping the operation.

When the controller determines that the opening is open based on the temperature detected by the temperature detection unit in a situation where all the device main body blocks are controlled to blow with a minimum air volume near the air volume, After the operation of the compressor of the apparatus main body block is stopped, the air volume of the blower fan of the apparatus main body block may be further reduced.
In this case, even if the air volume of each device main body block is near the minimum air volume, after the operation of the compressor of any device main body block is stopped, the air volume of the blower fan of the device main body block is further reduced. By doing so, it becomes possible to further reduce the air volume of the cooling air introduced into the passage.
The minimum air volume of the apparatus main body block is generally determined within a range in which the refrigerant can be circulated without any trouble in the refrigeration cycle. In other words, if the air flow of the device main body block becomes too small, the amount of heat treatment in the device main body block due to air blowing will decrease, causing problems such as frost adhesion and dew condensation, making it impossible to perform stable cooling operation. At the time of operation, the minimum air volume of the apparatus main body block is determined in consideration of such a situation. On the other hand, when the operation of the compressor is stopped, the air volume of the apparatus main body block can be further reduced without causing the above problems. In the above configuration, after the controller stops the operation of the compressor of any of the apparatus main body blocks, the air volume of the cooling air introduced into the passage is defective in order to further reduce the air volume of the blower fan of the apparatus main body block. Can be reduced.

The controller stops the operation of the compressor of any of the apparatus main body blocks based on the temperature detected by the temperature detection unit, and reduces the air volume of the blower fan of the apparatus main body block. The operation of the compressor may be stopped in preference to the apparatus main body block having a low capacity.
In this case, the compressor operation is stopped in preference to the current apparatus main body block having a low cooling capacity, and the air volume of the blower fan of the apparatus main body block is reduced, so that the decrease in the cooling capacity of the entire apparatus main body block is minimized. It is possible to reduce the air volume of the cooling air while suppressing it.

The controller stops the operation of the compressor of any of the apparatus body blocks based on the temperature detected by the temperature detection unit, and reduces the air volume of the blower fan of the apparatus body block. The operation of the compressor may be stopped preferentially from the apparatus main body block in which the path length to the cooling air introduction part becomes long.
In this case, in order to stop the operation of the compressor in preference to the apparatus main body block in which the path length to the introduction portion of the cooling air in the passage becomes long, and reduce the air volume of the blower fan of the apparatus main body block, It is possible to reduce the air volume of the cooling air while minimizing a decrease in the cooling capacity of the cooling air introduced into the introduction unit.

According to this invention, since the air conditioner controls the air volume based on the temperature detected by the temperature detector near the opening, the air volume of the air conditioner is appropriately controlled according to the degree of opening of the pressure avoidance damper. be able to. In addition, an increase in equipment cost can be suppressed as compared with the case where the degree of opening of the pressure-proof damper is detected using a contact switch.
Furthermore, according to the present invention, since the opening degree of the pressure avoidance damper is estimated based on the detection result of the temperature detection unit that does not have a contact contact, the maintenance frequency can be reduced compared to the case of using a contact switch. it can.

It is a perspective view which shows the outline | summary of the computer room air conditioning system of 1st Embodiment of this invention. It is typical sectional drawing which shows the outline | summary of the computer room air conditioning system of 1st Embodiment of this invention. It is sectional drawing to which a part of FIG. 2 of the computer room air conditioning system of 1st Embodiment of this invention was expanded. It is a typical top view which shows the outline | summary of the computer room air conditioning system of 2nd Embodiment of this invention. It is a block diagram which shows schematic structure of the computer room air conditioning system of 2nd Embodiment of this invention. It is a flowchart which shows the flow of control of the computer room air conditioning system of 2nd Embodiment of this invention. It is a typical top view which shows the modification of the computer room air conditioning system of embodiment of this invention.

Embodiments of the present invention will be described below with reference to the drawings.
First, the first embodiment shown in FIGS. 1 to 3 will be described.
FIG. 1 is a diagram showing an overall configuration of a computer room air conditioning system 100 according to this embodiment, and FIG. 2 is a diagram showing a schematic cross section of the computer room air conditioning system 100.
As shown in FIGS. 1 and 2, the computer room air conditioning system 100 is used in a computer room 101 formed in a substantially box shape, for example. The computer room 101 is surrounded by the floor 1, a wall and a ceiling (not shown). A double floor 2 is provided so as to be spaced upward from the floor 1, and a plurality of storage racks 3 are disposed on the double floor 2 so as to face each other, for example, in two rows. On the double floor 2, a passage 4 sandwiched between these two rows of storage racks 3 is formed. An internal space 5 is provided under the double floor 2, and the internal wiring 5 accommodates electrical wiring of each storage rack 3, electrical wiring of an air conditioner 6 described later, and the like.

A large number of blowout holes 8 (cooling air introduction portions) are formed on the passage 4 extending in the longitudinal direction of the double floor 2. The internal space 5 under the floor and the passage 4 communicate with each other through the plurality of blowing holes 8 so as to allow ventilation.
An air conditioner 6 is installed on the double floor 2 outside the passage 4. In the air conditioner 6, the hot air exhausted from the accommodation rack 3 is sucked from the suction port 6 a to be cooled, and the air (cooling air) cooled in the air conditioner 6 is sent from the bottom outlet 6 b to the interior space 5. To send.

  The cooling air supplied from the air conditioner 6 to the internal space 5 is supplied onto the passage 4 through the blowout hole 8. Each accommodation rack 3 is formed in a box shape and accommodates equipment 7 such as an electronic computer and communication equipment. The housing 3a of each storage rack 3 is provided with an intake surface 3b on the front surface side and an exhaust surface 3d on the upper surface side. An exhaust fan 3c is provided on the exhaust surface 3d. Each storage rack 3 receives cooling air from the passage 4 side, and cools the equipment 7 with the cooling air. The air that has cooled the device 7 becomes hot air and is discharged from the exhaust fan 3c to the outside.

  In the computer room air conditioning system 100, the upper shield 10 is installed between the upper surfaces of the storage racks 3 arranged to face each other with the passage 4 interposed therebetween. In the case of this embodiment, the upper shield 10 is formed in a box shape without a bottom. The upper shield 10 separates the cooling air circulation part in the passage 4 from the hot air circulation part above the housing rack 3. A pair of end shields 11 that connect the side ends of the storage racks 3 on opposite sides of the passage 4 are attached to the ends on both sides in the extending direction of the passage 4. These end shields 11 separate the cooling air circulation part in the passage 4 from the hot air circulation part outside the housing rack 3 at the end part. In this embodiment, the passage 4 is a closed space S on the double floor 2 surrounded by the receiving racks 3 on both sides, the upper shield 10 and the pair of end shields 11.

FIG. 3 is an enlarged view of the installation portion of the upper shield 10 of FIG.
The upper shield 10 includes a vertical wall 10a that is fastened and fixed to the upper surface of one storage rack 3 that is disposed opposite to the passage 4, and the other storage rack that crosses the upper side of the passage 4 from the upper end of the vertical wall 10a. 3 and an upper shielding wall 10b extending substantially horizontally toward the upper side. A support member 12 that supports the lower surface of the extended end of the upper shielding wall 10 b of the upper shielding body 10 is fixedly installed on the upper surface of the other storage rack 3. Therefore, the upper shield 10 is fastened and fixed in a cantilevered state to the upper surface of one of the storage racks 3 with the passage 4 interposed therebetween. When the upper shield 10 is in normal use, the lower surface of the extended end of the upper shield wall 10b comes into contact with the upper surface of the support member 12, so that the space between the upper shield 10 and the other storage rack 3 is substantially sealed.

  Further, a substantially rectangular opening 13 communicating with the inside and outside of the passage 4 is formed at a position of the upper shielding wall 10b near the vertical wall 10a. A substantially rectangular lid 15 is attached to the opening 13 via a hinge 14 so as to be opened and closed. In this embodiment, the lid body 15 and the hinge portion 14 constitute a pressure avoidance damper 16 that opens the opening portion 13 in accordance with the pressure difference between the inside and outside of the passage 4. The lid 15 opens and closes the opening 13 by a balance between the rising force due to the pressure difference between the inside and outside of the passage 4 acting on the upper and lower surfaces and the own weight. The lid 15 closes the opening 13 while the pressure difference between the inside and outside of the passage 4 is less than the set value, and opens the opening 13 when the pressure difference inside and outside the passage 4 becomes equal to or greater than the set value. .

  The hinge portion 14 is attached to the side of the opening 13 that is away from the vertical wall 10a. A stopper member 17 that supports the lower surface of the lid 15 that closes the opening 13 is attached to the lower edge of the side of the opening 13 on the vertical wall 10a side.

  Further, at the upper edge of the side of the opening 13 on the side of the vertical wall 10 a, the temperature at the position near the opening restricting member 18 that restricts the opening displacement of the lid 15 and the opening 13 outside the passage 4 is detected. A temperature sensor 19 (temperature detection unit) is attached.

As shown in FIG. 2, the temperature sensor 19 is connected to a processing circuit 20 a of the air conditioning control unit 20 of the air conditioner 6. The air conditioning controller 20 of the air conditioner 6 controls the amount of air blown to the passage 4 based on the temperature detected by the temperature sensor 19. Specifically, the air-conditioning control unit 20 decreases the air flow rate to the passage 4 so that the air volume decreases as the temperature detected by the temperature sensor 19 decreases.
In addition to the temperature sensor 19, the processing circuit 20a of the air-conditioning control unit 20 includes temperature sensors 21 and 22 (feedback temperature detection units) for detecting and controlling the respective temperatures on the suction side and the discharge side of the air conditioner 6. Is connected.

  In addition, the upper shielding body 10 in this embodiment is configured by arranging a plurality of pieces having a vertical wall 10a and an upper shielding wall 10b in the longitudinal direction of the passage. The opening 13 and the pressure-reducing damper 16 are provided in any of a plurality of pieces.

In the computer room air conditioning system 100 according to this embodiment, when the pressure difference between the inside and outside of the passage 4 sandwiching the upper shield 10 is less than the set value, the lid 15 is opened by the weight of the upper shield 10 during normal times. 13 is closed.
From this state, the difference between the air volume of the cooling air flowing into the passage 4 and the air volume of the exhaust air from the storage rack 3 becomes large due to some cause, and the difference in pressure between the inside and outside of the passage 4 with the upper shield 10 interposed therebetween. Is equal to or greater than the set value, the lid body 15 of the pressure-proof damper 16 is lifted upward with the hinge portion 14 as the center. Thereby, the opening 13 is opened, and a part of the cooling air in the passage 4 is released to the outside through the opening 13. As a result, the pressure in the passage 4 is reduced.

When the cover body 15 of the pressure avoidance damper 16 opens the opening 13 and the cooling air in the passage 4 flows into the vicinity of the temperature sensor 19 outside the opening 13, the temperature around the temperature sensor 19 is caused by the cooling air. Decreases, and the temperature detected by the temperature sensor 19 decreases. The detection signal from the temperature sensor 19 is input to the air conditioning controller 20 of the air conditioner 6. The air conditioning control unit 20 reduces the amount of air blown to the passage 4 to an amount corresponding to the temperature detected by the temperature sensor 19.
For example, the air-conditioning control unit 20 stores a data table that associates the relationship between the air flow rate of the air conditioner 6 and the detected temperature of the temperature sensor 19 in a storage unit, and the detected temperature of the temperature sensor 19 is detected. Sometimes the air volume of the air conditioner 6 may be determined with reference to the data table. The air conditioning control unit 20 defines the relationship between the air flow rate of the air conditioner 6 and the detected temperature of the temperature sensor 19 as an arithmetic expression, and the detected temperature detected when the detected temperature of the temperature sensor 19 is detected. May be substituted for the defined equation to determine the air flow rate of the air conditioner 6.

  As described above, in the computer room air conditioning system 100 according to this embodiment, the temperature sensor 19 is installed in the vicinity of the opening 13 outside the passage 4, and the air conditioner 6 is adjusted to the temperature detected by the temperature sensor 19. Based on this, the air flow rate to the passage 4 is controlled. For this reason, when the pressure difference between the inside and outside of the passage 4 becomes equal to or larger than the set value, the amount of air blown from the air conditioner 6 to the passage 4 can be appropriately controlled in accordance with the degree of opening of the pressure avoidance damper 16. In the computer room air conditioning system 100 according to this embodiment, in order to detect the degree of opening of the pressure avoidance damper 16 based on the temperature detected by the temperature sensor 19, the degree of opening of the pressure avoidance damper 16 is detected using a contact switch. Compared to the above, the complexity of the equipment can be suppressed.

  Further, the computer room air conditioning system 100 according to this embodiment uses a contact switch to estimate the degree of opening of the opening 13 by the pressure-proof damper 16 based on the detection signal of the temperature sensor 19 having no contact. The frequency of maintenance can be reduced as compared with the case of estimating the opening degree of the opening 13.

  By the way, in embodiment mentioned above, it is set as the structure which the air conditioning apparatus 6 controls air volume so that an air volume reduces so that detection temperature is low based on the detection temperature of the temperature sensor 19 which is a temperature detection part. However, as indicated by phantom lines in FIGS. 2 and 3, a temperature sensor 50 for detecting the temperature upstream of the opening 13 of the hot air circulation part is separately provided, and the temperature detected by the temperature sensor 50 on the upstream side is provided. And the air conditioning device 6 may control the amount of air blown according to the temperature difference between the temperature sensor 19 and the temperature detected by the temperature sensor 19. Specifically, for example, the air conditioner 6 sends the air volume so that the air volume decreases as the temperature difference between the temperature detected by the upstream temperature sensor 50 and the temperature detected by the temperature sensor 19 near the opening 13 increases. It may be configured to control.

  Further, a temperature sensor (not shown) is provided in the passage 4, and the air conditioner 6 controls the amount of air blown according to the temperature difference between the detected temperature of the temperature sensor 19 near the opening 13 and the detected temperature of the temperature sensor in the passage 4. You may make it control. In this case, for example, the air conditioner 6 controls the air volume so that the air volume decreases as the temperature difference between the temperature detected by the temperature sensor 19 near the opening 13 and the temperature detected by the temperature sensor in the passage 4 decreases. What is necessary is just to be the structure to do.

  In the computer room air conditioning system 100 according to the above embodiment, the temperature sensor 19 disposed in the vicinity of the opening 13 outputs a temperature detection signal to the air conditioning control unit 20, and the air conditioning control unit 20 performs data processing. The air volume of the air conditioner 6 is controlled by referring to and calculating the table, but the temperature detecting unit itself is provided with an air volume determining function by referring to and calculating the data table, and the determination result is used as an instruction value for the air conditioning control unit 20. You may make it transmit to.

4 and 5 are a schematic plan view and a block diagram of a computer air conditioning system 300 according to the second embodiment. FIG. 6 is a flowchart showing a control flow of the computer air conditioning system 300 according to the second embodiment.
The computer air-conditioning system 300 according to the second embodiment includes two pairs of rack rows in which rows of a plurality of storage racks 3 are arranged on the double floor 2 in the computer room 301 so as to face each other. Arranged in parallel, a passage 4 is formed between each pair of rack rows. An upper shield 10 similar to that of the first embodiment is installed between the upper surfaces of the accommodation racks 3 that are arranged to face each other with the passages 4 interposed therebetween. Between the side ends of the storage racks 3 on both sides opposed to each other with the passage 4 interposed therebetween, the end shields are not shown. Each passage 4 is connected to an internal space below the double floor 2 through a blow-out passage (not shown) on the double floor 2. Cooling air is introduced into each passage 4 through the internal space below the double floor 2.
The intake surface of each storage rack 3 faces the passage 4, and the exhaust surface of each storage rack 3 faces the hot air circulation part. The upper shield 10 separates the cooling air circulation part in the passage 4 from the warm air circulation part outside the passage 4.

  A plurality of openings 13 are formed on the upper surface of each upper shield 10 as in the first embodiment, and a lid 15 is attached to each opening 13 via a hinge (not shown) so as to be opened and closed. ing. Also in the case of the second embodiment, the lid body 15 and the hinge portion constitute the pressure-proof damper 16. The lid 15 opens and closes the opening 13 by a balance between the rising force due to the pressure difference between the inside and outside of the passage acting on the upper and lower surfaces and the own weight. In addition, a temperature sensor 19 (temperature detection unit) is installed in the vicinity of the opening 13 on the outside of each passage 4.

  In the case of the second embodiment, the air conditioning apparatus 306 includes three apparatus main body blocks 306A, 306B, and 306C that are spaced apart from each other on the double floor 2. Each of the apparatus main body blocks 306A, 306B, and 306C includes a compressor, a blower fan, a heat exchanger, and the like (not shown). As for each apparatus main body block 306A, 306B, 306C, the suction inlet faces the circulation part of warm air, and the blower outlet faces the internal space below the double floor 2.

  Further, as shown in FIG. 5, the three apparatus main body blocks 306A, 306B, and 306C are controlled by a common controller 30 for the cooling temperature, the air volume of the cooling air, and the like. Feedback signals wa, wb, wc relating to the current cooling capacity (for example, electric power of a compressor or the like used for cooling operation) of each of the apparatus main body blocks 306A, 306B, 306C are input to the input unit of the controller 30. The detected temperature signal Temp is input from the temperature sensor 19 installed in each upper shield 10.

The controller 30 controls the operation of the three apparatus main body blocks 306A, 306B, and 306C at a basically set temperature and air volume. When a detection signal that changes in accordance with the opening degree of the pressure-proof damper 16 is input from the temperature sensor 19 installed in the upper shield 10 above each passage 4, the controller 30 is based on the detection signal. The amount of cooling air blown from each of the apparatus main body blocks 306A, 306B, 306C is reduced.
Here, based on the detection signal input from the temperature sensor 19, the controller 30 can determine the opening degree of the pressure avoidance damper 16 by any of the following, for example.
(1) The opening degree of the pressure avoidance damper 16 is determined based on the temperature difference between the preset temperature and the detection signal of the temperature sensor 19.
(2) The opening degree of the pressure avoidance damper 16 is determined based on the temperature difference between the temperature upstream of the opening of the hot air circulation section and the detection signal of the temperature sensor 19.
(3) Based on the temperature difference between the detection signal of the temperature sensor 19 and the temperature in the passage 4, the opening degree of the pressure avoidance damper 16 is determined.

  In the case of this embodiment, the air volume reduction control of the cooling air of the apparatus main body blocks 306A, 306B, 306C by the controller 30 is basically based on the reduction of the air volume of the blower fans of the apparatus main body blocks 306A, 306B, 306C. However, when the air volume of the blower fans of the apparatus main body blocks 306A, 306B, and 306C is a set air volume that is close to the minimum, the operation of one of the three apparatus main body blocks 306A, 306B, and 306C is stopped. The total air volume of the cooling air in the blocks 306A, 306B, and 306C is reduced.

The controller 30 determines which one of the three apparatus main body blocks 306A, 306B, and 306C is to be stopped, for example, according to the following priority order (a) or (b).
(A) Out of the three apparatus main body blocks 306A, 306B, and 306C, the one with the current low cooling capacity is given priority and stopped sequentially.
(B) Of the three apparatus main body blocks 306A, 306B, and 306C, the longest path length to the cooling air introduction part in the passage 4 is given priority and stopped sequentially.

The flowchart of FIG. 6 shows the apparatus main body blocks 306A, 306B, and 306C in the priority order (a) described above when the air flow of the blower fans of the apparatus main body blocks 306A, 306B, and 306C is operated at a set air volume that is close to the minimum. The flow of control when stopping the operation of is shown. In the example of the flowchart of FIG. 6, the above (1) is adopted for the determination of the opening degree of the pressure avoidance damper 16.
Explaining this control, in step S101, the controller 30 determines whether or not the temperature detected by any one of the temperature sensors 19 outside the opening 13 is equal to or lower than the set temperature C1Temp. 16 determines whether it is open.
When the detected temperature of the temperature sensor 19 is equal to or lower than the set temperature C1Temp, the process proceeds to step S102, and when the detected temperature is higher than the set temperature C1Temp, the process proceeds to step S103. When the process proceeds to step S103, since the pressure damper 16 is closed, the controller 30 continues the operation of the apparatus main body blocks 306A, 306B, 306C and returns.
When the processing proceeds to step S102, the controller 30 compares the cooling capacities wa, wb, wc of the three apparatus main body blocks 306A, 306B, 306C that are currently operating, and determines the minimum cooling capacities.
In subsequent step S104, the controller 30 stops the operation of the apparatus main body blocks 306A, 306B, and 306C having the smallest current cooling capacity and returns.
Thereafter, when the temperature detected by the temperature sensor 19 is equal to or lower than the set temperature C1Temp when returning to step S101, the process proceeds to step S102, where the controller 30 cools the two apparatus main body blocks currently operating. Are compared to determine the one having a small cooling capacity. In subsequent step S104, the controller 30 stops the operation of the apparatus main body block having a small current cooling capacity.

  As described above, in the computer air-conditioning system 300 according to the second embodiment, the basic configuration is substantially the same as that of the first embodiment, so the same basic effects as those of the first embodiment are obtained. be able to. However, in the computer air conditioning system 300 according to the second embodiment, even when the three apparatus main body blocks 306A, 306B, 306C are operating near the minimum air volume, any one of the apparatus main body blocks 306A, By stopping 306B and 306C, the total air volume of the apparatus main body blocks 306A, 306B and 306C can be reduced, and the pressure difference inside and outside the passage 4 can be reduced.

  In particular, when the apparatus main body blocks 306A, 306B, 306C are stopped in the priority order (a) described above, the passage of the apparatus main body blocks 306A, 306B, 306C is minimized while minimizing the decrease in the cooling capacity. The air volume of the cooling air introduced into 4 can be reduced. That is, in this embodiment, the apparatus main body blocks 306A, 306B, and 306C are sequentially stopped with priority given to the current low cooling capacity, so that the cooling capacity that affects the temperature of the cooling air in the passage 4 is reduced. The decrease is minimized, and the air volume of the cooling air introduced into the passage 4 is reduced.

  Further, when the apparatus main body blocks 306A, 306B, and 306C are stopped in the priority order (b) described above, the apparatus main body blocks 306A, 306B, and 306C are introduced into the passage 4 while minimizing the reduction in cooling capacity of the cooling air introduced into the passage 4. The air volume of the cooling air that is generated can be reduced. That is, in this embodiment, the apparatus main body blocks 306A, 306B, and 306C are sequentially stopped in order from the longest path length to the cooling air introduction portion in the passage 4, so that the cooling air in the passage 4 is stopped. Since the apparatus main body block is likely to rise in temperature before reaching the introduction section, it is possible to minimize a decrease in the cooling capacity of the cooling air introduced into the passage 4.

Next, a computer air conditioning system according to a third embodiment will be described with reference to FIGS.
The computer air-conditioning system according to the third embodiment has the same mechanical configuration as the computer air-conditioning system according to the second embodiment shown in FIG. 4 and FIG. From the computer air conditioning system according to the second embodiment, the control of the controller 30 when a detection signal that changes in accordance with the opening degree of the pressure avoidance damper 16 is input.

Also in the case of the third embodiment, the controller 30 controls the air flow reduction of the apparatus main body blocks 306A, 306B, and 306C basically by reducing the air flow of the blower fans of the apparatus main body blocks 306A, 306B, and 306C. Has been. In this embodiment, when the air flow rate of the blower fans of the apparatus main body blocks 306A, 306B, and 306C is a set air volume that is close to the minimum, the controller 30 is connected to one of the three apparatus main body blocks 306A, 306B, and 306C. After stopping the operation, the air volume of the blower fan of the apparatus body block is further reduced.
The controller 30 sets the opening degree of the pressure avoidance damper 16 based on the detection signal input from the temperature sensor 19 by, for example, any one of the above (1) to (3) described in the second embodiment. Can be determined. Further, the controller 30 determines which compressor of the three apparatus main body blocks 306A, 306B, and 306C is to be stopped, for example, in the priority order as described in the above-described (a) and (b) for the second embodiment. To decide.

  In the case of control by the controller 30 of the third embodiment, in step S104 of FIG. 6, the operation of the compressors of the apparatus main body blocks 306A, 306B, 306C having the current cooling capacity is stopped, and then the operation of the compressor is performed. The air volume of the blower fan of the apparatus body block that has stopped is further reduced. Other steps are the same as those in the second embodiment.

  As described above, in the computer air-conditioning system according to the third embodiment, any of the apparatus main body blocks can be used even in a situation where each of the apparatus main body blocks 306A, 306B, and 306C is operating at a minimum air volume. After the operation of the compressors 306A, 306B, and 306C is stopped, the air volume introduced into the passage can be further reduced by further reducing the air volume of the blower fan of the apparatus body block. Therefore, the pressure difference between the inside and outside of the passage can be reliably reduced.

The reason why the air volume of the blower fan of the apparatus main body block can be further reduced after the operation of the compressor of any of the apparatus main body blocks 306A, 306B, 306C is stopped is as follows.
In other words, if the compressor operation of any device block is stopped, the piping in the device block will be excessively cooled even if the air flow is reduced to a certain extent (more than the minimum air flow until now). Therefore, it is difficult for frost to adhere and condensation to occur. For this reason, the air volume of the cooling air introduced into the passage 4 can be reduced without problems.

  Also in the computer air-conditioning system according to the third embodiment, the operation of the compressors of the apparatus main body blocks 306A, 306B, and 306C is stopped at the priority order (a), and the air volume of the apparatus main body block is reduced. In this case, it is possible to reduce the air volume of the cooling air introduced into the passage 4 while minimizing the decrease in the cooling capacity of the entire apparatus main body blocks 306A, 306B, and 306C.

  Also in the computer air conditioning system according to the third embodiment, when the apparatus main body blocks 306A, 306B, 306C are stopped at the priority order (b) and the air volume of the apparatus main body block is reduced. Can reduce the air volume of the cooling air introduced into the passage 4 while minimizing a decrease in the cooling capacity of the cooling air introduced into the passage 4.

In addition, this invention is not limited to said embodiment, A various design change is possible in the range which does not deviate from the summary. For example, in each of the above embodiments, the cooling air blown out from the air conditioner 6 is introduced into the passage 4 through the internal space 5 below the double floor 2, as shown in FIG. The air conditioner 6 may be disposed adjacent to any storage rack 3 so that the air outlet 6b faces the passage 4 directly. In FIG. 7, the same parts as those in the embodiment shown in FIGS.
Further, in the computer room air conditioning systems according to the second and third embodiments, each of the apparatus main body blocks 306A, 306B, and 306C of the air conditioner 306 can be placed in any storage rack so that the air outlet directly faces the passage 4. It may be arranged adjacent to 3.

DESCRIPTION OF SYMBOLS 3 ... Accommodating rack 3b ... Intake surface 3d ... Exhaust surface 4 ... Passage 6,306 ... Air conditioning apparatus 10 ... Upper shielding body 13 ... Opening part 16 ... Pressure-proof damper 19 ... Temperature sensor 19 (temperature detection part)
DESCRIPTION OF SYMBOLS 20 ... Air-conditioning control part 20a ... Processing circuit 21,22 ... Temperature sensor 21 (Feedback temperature detection part)
30 Controller 100, 300 ... Computer room air conditioning system 306A, 306B, 306C ... Main unit block

Claims (13)

A plurality of storage racks that house equipment and have an intake surface for taking in cooling air and an exhaust surface for exhausting hot hot air;
An air conditioner that draws in hot air and sends out cooling air;
An upper shield that covers an upper part of the passage facing the intake surface of the housing rack and separates a cooling air circulation part and a hot air circulation part;
The upper shield is provided with an opening that communicates the inside and outside of the passage, and a pressure avoidance damper that opens the opening according to a pressure difference between the inside and outside of the passage to reduce the pressure difference between the inside and the outside. And
A temperature detector is provided in the vicinity of the opening outside the passage,
The computer room air conditioning system characterized in that the air conditioner controls the amount of air blown to the passage based on the temperature detected by the temperature detector.   2. The computer room air conditioning system according to claim 1, wherein the air conditioner controls the air flow rate based on the temperature detected by the temperature detector so that the air volume decreases as the detected temperature decreases.   The air conditioner sends the air volume such that the air volume decreases as the temperature difference between the temperature upstream of the opening of the circulating portion of the hot air and the detected temperature increases, based on the temperature detected by the temperature detector. The computer room air conditioning system according to claim 1, wherein the air volume is controlled.   The air conditioner controls the air volume so that the air volume decreases as the temperature difference between the detected temperature and the temperature in the passage is smaller, based on the temperature detected by the temperature detector. The computer room air conditioning system according to 1.   The temperature detection unit shares a processing circuit with a feedback temperature detection unit that detects the temperature of at least one of the suction side and the discharge side of the air conditioner and feeds back to the air conditioning control unit. 5. The computer room air conditioning system according to any one of 4 above. Comprising the air conditioner and a controller;
The air conditioner includes a plurality of device body blocks each having a compressor and a blower fan,
The controller controls the operation of a plurality of the apparatus main body blocks,
6. The computer room air conditioning system according to claim 1, wherein the controller stops the operation of any one of the apparatus main body blocks based on a temperature detected by the temperature detection unit. .   When the controller determines that the opening is open based on the temperature detected by the temperature detection unit in a situation where all the device main body blocks are controlled to blow with a minimum air volume near the air volume, 7. The computer room air conditioning system according to claim 6, wherein the operation of the apparatus main body block is stopped.   When the controller stops the operation of any of the apparatus main body blocks based on the temperature detected by the temperature detection unit, the controller preferentially stops the operation from the apparatus main body block having a low current cooling capacity. The computer room air conditioning system according to claim 6 or 7, characterized in that   When the controller stops the operation of any of the apparatus main body blocks based on the temperature detected by the temperature detection section, the path length from the apparatus main body block to the cooling air introduction section of the passage becomes longer. 9. The computer room air conditioning system according to claim 7 or 8, wherein the operation is preferentially stopped. Comprising the air conditioner and a controller;
The air conditioner includes a plurality of device body blocks each having a compressor and a blower fan,
The controller controls the operation of a plurality of the apparatus main body blocks,
The controller further reduces the air volume of the blower fan of the apparatus main body block after stopping the operation of the compressor of any of the apparatus main body blocks based on the temperature detected by the temperature detection unit. The computer room air conditioning system according to any one of claims 1 to 5.   When the controller determines that the opening is open based on the temperature detected by the temperature detection unit in a situation where all the device main body blocks are controlled to blow with a minimum air volume near the air volume, The computer room air conditioning system according to claim 10, wherein after the operation of the compressor of the apparatus body block is stopped, the air volume of the blower fan of the apparatus body block is further reduced.   The controller stops the operation of the compressor of any of the apparatus main body blocks based on the temperature detected by the temperature detection unit, and reduces the air volume of the blower fan of the apparatus main body block. The computer room air conditioning system according to claim 10 or 11, wherein the operation of the compressor is stopped in preference to the apparatus main body block having a low capacity.   The controller stops the operation of the compressor of any of the apparatus body blocks based on the temperature detected by the temperature detection unit, and reduces the air volume of the blower fan of the apparatus body block. The computer room air conditioning system according to claim 10 or 11, wherein the operation of the compressor is preferentially stopped from the apparatus main body block in which a path length to the introduction portion of the cooling air becomes long.

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