JP3842631B2 - Air conditioning systems for communication / information processing equipment rooms, etc. - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an air conditioning system for a room having a high heat generation density, such as a communication / information processing equipment room, and an operation method thereof.
[0002]
[Prior art]
In so-called computer rooms that contain a large number of computers, most of the air conditioning load is sensible heat load, and the average heat generation density per floor area is 500 w / m. ² Degree. In such facilities, full sensible heat treatment type packaged air conditioners are often used because of the ease of construction and maintenance and the ability to disperse heat sources. In addition, since the room structure of these facilities requires a large number of power cables and signal cables to be wired, most of them have a double floor structure, and the underfloor chamber is used as a wiring space.
[0003]
The air conditioner with a packaged air conditioner also uses the underfloor chamber as an air path, so the packaged air conditioner has an upper suction and lower blowout system, and low temperature air processed by the packaged air conditioner is installed through the underfloor chamber to install a computer, etc. The equipment is transported to a place, and the low-temperature air is supplied into the equipment casing from an opening provided at the lower part of the equipment to process the exhaust heat from the equipment.
[0004]
The configuration of such a conventional air conditioning system is shown in FIG. The full sensible heat treatment type packaged air conditioner 101 includes a direct expansion type cooling coil 102 and a blower 103, and the direct expansion type cooling coil 102 includes an outdoor unit 104 and a refrigerant pipe installed outside the equipment room M. It is tied at 105. The temperature of the air blown out from this all-sensible heat treatment type packaged air conditioner 101 is usually 15 to 20 ° C., and is exhausted from the computer 106 (supplied from the opening 108 under the computer 106 through the underfloor chamber 107 of the double floor). Air) and the air blown into the equipment room M from the opening 109 of the floor F of the equipment room M, that is, the return air temperature to the packaged air conditioner 101 is about 25 ° C. Therefore, the processing temperature difference in the full sensible heat treatment type package air conditioner 101 is about 5 to 10 ° C. The cooling capacity per unit of all sensible heat treatment type packaged air conditioners currently commercialized is about 10-40 kW, and the number of packaged air conditioners according to the air conditioning heat load is installed along the outer peripheral wall in the equipment room M. Air conditioning.
[0005]
In addition, the control target range of the refrigerant evaporation temperature of the direct expansion type cooling coil 102 of a general packaged air conditioner such as the all-sensible heat treatment type packaged air conditioner 101 is a constant value, for example, about 2 to 6 ° C. The indoor humidity at the time of indoor cooling using such an air conditioner depends on the amount of dehumidification in the direct expansion type cooling coil 102. This amount of dehumidification depends on the operating time of the air conditioner determined by the refrigerant evaporation temperature and the size of the cooling load. Therefore, in rooms where the room humidity needs to be kept constant, it is necessary to install a dehumidifier or humidifier separately to manage the humidity.
[0006]
[Problems to be solved by the invention]
By the way, with the spread of the Internet, businesses using the Internet are increasing. Many communication and information processing facilities have been built to develop these businesses. In the communication / information processing equipment rooms in these facilities, as shown in FIG. 10, a large number of racks L in which a plurality of communication / information processing equipment such as servers and routers are stored are arranged in the equipment room. In these facilities, most of the air conditioning heat load is sensible heat load, and the heat generation density is much larger than that of a general computer room. Inside, the heat density per floor area is 1000 W / m ² There are some facilities that exceed this, and this trend is expected to continue for the time being.
[0007]
When air-conditioning such an equipment room with a high heat generation density is performed, the conventional method of increasing the number of all sensible heat treatment type packaged air conditioners 101 used in the computer room according to the heat load is used. There is a possibility that the number of installed units 101 will increase significantly, and indoor units cannot be installed using only the wall surface of the equipment room in the facility. In addition, it is difficult not only to secure the installation space for the indoor unit, but also to significantly increase the blast energy due to the increase in the blast volume in the method of adding packaged air conditioners. Further, if the floor area of the equipment room is increased or the amount of communication cable in the underfloor chamber is increased, the air cannot be uniformly blown into the underfloor chamber 107, resulting in variations in the cooling capacity for vital communication / information processing equipment. In addition, when there is an area where the heat generation density is locally high in the equipment room, it is necessary to increase the air flow rate and lower the air temperature, but it is difficult to cope locally with the conventional system.
[0008]
Furthermore, as described above, when cooling a room using a general packaged air conditioner 101, if the sensible heat load is small and the intrusion moisture from the outside air is large, the sensible heat load is small. Since the room temperature reaches the set temperature relatively quickly, the air conditioner stops without sufficient dehumidification. When the sensible heat load increases, the air conditioner operates continuously, condensation occurs in the cooling coil built in the air conditioner, and the dehumidification is reduced until the dew point temperature of the room air corresponds to the surface temperature of the cooling coil. Done. As described above, in general packaged air conditioners, the amount of dehumidification varies depending on the sensible heat load, so it is necessary to maintain a constant room humidity such as the computer room and the communication / information processing machine room as described above. In each room, a dedicated dehumidifier must be provided, which increases the initial cost.
[0009]
Further, when the sensible heat load is large, the operation time of the air conditioner becomes long, but the amount of dehumidification depends on the operation time of the air conditioner and the like. When the amount of dehumidification is excessive, useless energy such as humidification with a humidifier while dehumidifying with a cooling coil may be consumed.
[0010]
The present invention has been made in view of the above points, and effectively treats equipment exhaust heat in a rack equipped with communication / information processing equipment to reduce the air-conditioning heat load and to install air-conditioning equipment. Its purpose is to devise a space and to solve the above problems. Also, in the present invention, when air conditioning the entire communication / information processing equipment room using an air conditioner such as a packaged air conditioner, dehumidification is achieved by devising control target values and operation methods between these air conditioners. Its purpose is to perform humidity adjustment (adjustment related to dehumidification) without using special equipment such as a machine.
[0011]
[Means for Solving the Problems]
In order to achieve the above object, according to claim 1, a communication / information processing equipment room in which racks in which communication / information processing equipment is mounted in a vertical direction is aligned to form a rack row and a plurality of the rack rows are installed. Etc., and a local cooling device for cooling the space portion is provided above the space portion formed between the rack rows, structurally separated from the rack row, The local cooling device has an air outlet provided so as to face the floor surface of the communication / information processing equipment room, and a suction port for taking in air in an upper space in the communication / information processing equipment room. An air conditioning system such as a communication / information processing equipment room is provided.
[0012]
In this way, only above the space formed between the rack rows, the suction is to be separated from the rack rows and to take in the high-temperature air in the air outlets facing the floor and the upper space of the equipment room. By arranging a local cooling device having a mouth, the rack can be freely replaced and moved, and only the space formed between the rack rows can be locally cooled. Through this, it becomes possible to reduce the heat load of the rack. Furthermore, since the local cooling device is structurally separated and independent from the rack row, the degree of freedom of arrangement of the indoor units and the rack row is improved. For example, when replacing a rack in an existing facility, It is possible to respond quickly. In addition, since the area around the local cooling device is an open space, there is no need to balance the indoor unit installed in the equipment room with the ventilation airflow of the rack. There is also a high degree of freedom in changing the air volume of the blower provided in the indoor unit and rack. Therefore, for example, even if a blower provided in the local cooling device breaks down, the static pressure in the space does not change, so there is almost no change in the rack ventilation amount, and the cooling performance for the rack is less deteriorated.
In addition, even if the rack row is only part of the equipment room or is added sequentially at different times, it is only necessary to add local cooling devices corresponding to the added rack row. Can also be reduced. Furthermore, since the local cooling device is installed above the space formed between the rack rows, the special floor occupation area is not increased.
Furthermore, since the surrounding area of the local cooling device is an open space, the maintainability of the local cooling device is also good.
[0013]
Note that the communication / information processing equipment room in this specification does not mean only the room where the communication / information processing equipment is installed, but the heat generation equipment is installed with high heat generation and high density. The room is also the target. Therefore, it may be a computer room. In addition, the communication / information processing equipment includes various computer devices such as servers, communication equipment, and arithmetic processors.
[0014]
When a local cooling device is arranged only above the space formed between the rack rows, it can correspond to a room having a very large heat generation density, but in a room with a heat generation density somewhat smaller than that, the passage space portion By installing a local cooling device only above the rack, rack cooling can be performed efficiently. In other words, when there are multiple rack rows, the local cooling device is not installed in all the space portions formed between the rack rows, but only locally above every other space portion, that is, the passage space portion. By installing the equipment, it is possible to handle the rack heat load of all rack rows.
[0015]
In the case of claim 1, the rack has an opening in a portion facing the space formed between the rack rows, and in the case of claim 2, the rack is opened only in a portion facing the passage space. It is desirable that a blower for exhausting the atmosphere in the rack to the outside of the rack is provided at the top of the rack. By operating the blower, the conditioned air supplied to the space or passage space can be actively taken into the rack from the opening, and the communication / information processing installed in the rack It is possible to more effectively carry out exhaust heat treatment of equipment and the like. In the case of using a rack having such a structure, it is possible to effectively carry out exhaust heat treatment of communication / information processing equipment mounted in the rack even in a room without a double floor. Therefore, the cost for installing the double floor can be reduced, and the existing equipment room without the double floor can be easily repaired.
[0016]
Even if there is no blower at the top of the rack, for example, the communication / information processing equipment mounted on the rack has its own blower, and the air supply / exhaust direction of each blower is the communication / information processing mounted on the rack. A configuration that is uniform among devices may be used. In this case, only the operation of such a unique blower (usually a small blower is common) equipped in communication / information processing equipment such as a server is used, and conditioned air is discharged from the space or passage space. It can be taken into the rack and exhausted. As a result, it is possible to carry out exhaust heat treatment of the communication / information processing device.
[0017]
In view of such an action, the air supply / exhaust direction of the blower installed in each communication / information processing device is determined by, for example, providing such a blower aligned with a specific side surface of each communication / information processing device. It is preferable that each communication / information processing device is installed.
[0018]
When the rack is installed on a double floor constituting an underfloor chamber, an opening communicating with the underfloor chamber is formed on the lower surface of the space formed between the rack rows, as described above. In addition, it is preferable that a fan for exhausting the atmosphere in the rack to the outside of the rack is provided at the upper part of the rack, or that the air supply / exhaust directions by the fans provided in each communication / information processing device are aligned. In this case, the static pressure in the underfloor chamber needs to be higher than the static pressure in the equipment room, and conditioned air is supplied into the underfloor chamber by an air conditioner other than the local cooling device. Therefore, the conditioned air is blown out from the double floor into the equipment room at the opening communicating with the underfloor chamber. Of the spaces formed between the rack rows, in the space or passage space where the local cooling device is installed in the upper space, the air is blown out from the conditioned air blown out from the local cooling device and the floor opening. The conditioned air thus mixed is sucked from an opening formed on the side surface of the rack, and after cooling the devices stacked inside the rack, the air is exhausted by a blower included in a blower or communication device on the top of the rack. In the space where the local cooling device is not installed in the upper space, the conditioned air blown out from the floor opening is used for air conditioning of the indoor atmosphere.
If the rack is installed on the double floor and an opening that leads to the underfloor chamber is formed in the space formed between the rack rows or on the lower surface of the rack, conditioned air is introduced into the rack from the side of the rack. it can. Since communication devices are mounted horizontally on the shelves and slots in the rack, each communication device can be directly cooled by introducing it from the side, which is efficient.
[0019]
It is preferable that an opening for communicating with the underfloor chamber is provided with an air amount adjusting mechanism for adjusting the amount of air passing through the opening. The air amount adjusting mechanism can be adjusted, for example, for each floor panel, and can arbitrarily change the amount of air-conditioning air blown from the floor opening and the blowing pattern. Therefore, in the space part and the passage space part in which the local cooling device is installed in the upper space, it becomes possible to arbitrarily change the mixed pattern and the airflow shape of the conditioned air.
As an air amount adjusting mechanism, for example, a shutter that can change the aperture ratio of the opening stepwise or continuously can be cited.
[0020]
When multiple fans are installed at the top of the rack to exhaust the atmosphere inside the rack to the outside of the rack, in order to keep the temperature of the exhaust below the installation temperature, the number of operating fans is controlled by, for example, a number controller. As a result, it is possible to reduce excess air transport energy in a rack that generates little heat from the equipment.
[0021]
The local cooling device is efficient if the cooling capacity of each local cooling device is controlled based on the temperature of the space or passage space formed between the lower rack rows for each local cooling device. In addition, the heat treatment of the racks can be performed by air-conditioning the spaces or passage spaces formed between the appropriate rack rows. Further, in an area where the heat generation density is high, an operation that partially increases the cooling capacity of the local cooling device is possible, so that it is possible to cope with spatial variations in the heat generation load. In addition, even when a part of the local cooling device fails and stops, by performing an operation that partially increases the cooling capacity of the local cooling device, the space portion and passage space formed between the rack rows It becomes possible to suppress the temperature rise of the part.
[0022]
If the local cooling device has a direct expansion coil as a cooling means and further controls the refrigerant evaporation temperature of the direct expansion coil to be higher than the dew point temperature of the processing air, no dew condensation water is generated. , It is possible to prevent an unexpected situation from being caused by water leakage or the like on a communication / information processing device mounted on a rack or the like. In this case, an outdoor air conditioner that dehumidifies the outside air to supply it to the room so that the atmosphere in the equipment room matches the set dew point temperature as needed, or the dew point temperature of the room air is By providing a dehumidifying device for dehumidifying to the set value when the set value is exceeded, such so-called thirst coil operation control can be easily performed.
[0023]
Further, according to the air conditioning method proposed by the present invention, so-called thirst coil operation control can be easily performed without providing a dedicated dehumidifying device.
That is, the communication / information processing equipment room has a plurality of air conditioners for supplying conditioned air, and these air conditioners have built-in direct expansion type cooling coils. The control target value of the refrigerant evaporation temperature of some air conditioners is set lower than the control target value of the refrigerant evaporation temperature of other air conditioners, and when the dew point temperature of the room air becomes higher, it is given priority. The cooling coils of the some air conditioners may be condensed. This makes it possible to change the dew point temperature of indoor air without providing a dedicated dehumidifier, and to easily control the thirst coil operation of local cooling devices and other air conditioners.
[0024]
In this case, for example, the dew point temperature of the room air is changed by changing the set value of the refrigerant evaporation temperature of the some air conditioners within a range lower than the set value of the refrigerant evaporation temperature of the other air conditioners. Also good.
In addition, some of the air conditioners may be operated continuously regardless of the room temperature except when the dew point temperature of the room air falls below a set value. At this time, the other air conditioners adjust the cooling capacity when the room temperature approaches the set value, and adjust the cooling capacity of the entire air conditioning system by performing the operation corresponding to the sensible heat load.
[0025]
Such an air conditioning method is particularly suitable for a communication equipment humidity / computer room where the sensible heat load is significantly larger than the latent heat load. When the sensible heat load is further reduced, the refrigerant evaporation temperature of the air conditioner gradually decreases, and the dew point temperature of the room air also decreases accordingly. Then, when both the indoor air temperature and the dew point temperature are lower than the set values, the energy consumption due to excessive dehumidification and cooling can be eliminated by performing the operation so as to stop the part of the air conditioners.
[0026]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. FIG. 1: has shown the outline | summary of the mode in equipment rooms R, such as a communication and information processing equipment room which has an air-conditioning system concerning a 1st embodiment. In the illustrated example, four rows of racks L in which communication / information processing devices are mounted are installed indoors, and a passage space portion X is formed between the rack rows A and B and between the rack rows C and D, respectively. ing. Note that a space Y formed between the rack rows is formed between the rack rows B to C.
[0027]
In this type of communication / information processing equipment room, the rack L conventionally used is provided with doors (not shown) that can be opened and closed for maintenance and inspection on the front and back, and the dimensions of each rack L are as follows. Often they are identical in the same column. In addition, devices such as servers mounted on the rack L are fixed on rails (not shown) provided in the rack L and stacked in multiple stages.
[0028]
In the present embodiment, the front or back surfaces of each rack L face each other for each rack row. In this way, the rack L is installed so that the front surfaces of the racks L face each other in the passage space X. It is desirable. Such a passage space X usually has a width of about 900 mm. On the top plate portion of each rack L, a blower 1 for exhausting the atmosphere in the rack L to the outside of the rack is installed.
[0029]
As shown in FIG. 2, the rack L itself has a casing 3 for housing a device 2 such as a server and various communication / information processing devices, and faces the passage space X of the casing 3. Openings 4 are respectively formed on the side surfaces. The opening 4 may be a hole in a punching metal, or may be formed by a slit or the like. When there is an opening / closing door on the side surface, the opening 4 may be created by forming the opening / closing door itself by punching metal or by providing a slit in the opening / closing door.
[0030]
As shown in FIG. 3, the equipment room R has a double floor structure, and an underfloor chamber 11 is formed below the floor surface F. Each rack L is installed on a floor surface F, and an opening 12 communicating with the underfloor chamber 11 is provided on the floor surface F below the rack L. Further, openings 13 and 14 that communicate with the underfloor chamber 11 are provided in places other than the rack installation portion of the floor surface F as necessary.
[0031]
Each opening 12, 13 and 14 of the floor surface F is provided with an air amount adjusting mechanism capable of arbitrarily changing the opening ratio, for example, a shutter or the like, in the vicinity of a rack where more cooling air is required. Air conditioning air can be supplied with priority. Further, by adjusting the aperture ratio, the shape of the airflow in the passage space X can be adjusted, and the conditioned air can be uniformly supplied to all the racks L.
[0032]
Above each passage space portion X, a plurality of local cooling devices 21 are installed so as to be structurally separated from the rack row. The local cooling device 21 has a blow-out port 22 facing the lower floor surface F, a suction port 23 for taking in high-temperature air in the upper space of the equipment room R, and a blower 24. The high-temperature air supplied to the passage space X and exhausted from the rack L is sucked and processed. The number of installed local cooling devices 21 is determined by the heat generation density of the rack L facing the passage space X.
[0033]
The local cooling device 21 is suspended from the ceiling portion 25 of the room R, for example, and is installed structurally separated from the rack row. Therefore, the periphery of the local cooling device 21 is an open space. For example, the local cooling device 21 may be installed on a column or a stand erected from the floor surface F independently of the rack L, for example.
[0034]
The local cooling device 21 has a cooling coil 26. The cooling coil 26 is a direct expansion type cooling coil, and is connected to an outdoor unit 27 installed outside the equipment room R by a refrigerant pipe 28 as shown in FIG. The refrigerant passes through an electronic expansion valve 29 for adjusting the refrigerant flow rate and is supplied to the cooling coil 26. The refrigerant pipe 28 passes through, for example, the upper part in the equipment room R, and several local cooling devices 21 can be connected to one outdoor unit 27. The outdoor unit 27 can be either air-cooled or water-cooled.
[0035]
Each local cooling device 21 has a temperature sensor (not shown) for detecting the temperature of the lower passage space X and a temperature sensor (not shown) for detecting the refrigerant evaporation temperature. , And a controller / power supply box (not shown) for performing these signal processing and adjusting the opening degree of the electronic expansion valve 29. Furthermore, the outdoor unit 27 is equipped with a controller (not shown) for controlling and monitoring the operation of each local cooling device 21 as a whole and for determining the operation capacity of the compressor.
[0036]
The controllers of the outdoor unit 27 and the local circulation devices 21 perform stable operation control by sequentially exchanging data. At this time, the refrigerant evaporation temperature of the cooling coil 26 is controlled to be higher than the indoor dew point temperature in the equipment room R, and is normally operated as a dry coil. Further, the housing bottom plate of the local cooling device 21 also serves as a waterproof pan at least immediately below the cooling coil 26. In the unlikely event that condensed water is generated due to condensation, it accumulates in the bottom plate, and the lower rack Consideration is given so that the device 2 in L does not get condensed water. Further, when the dew condensation water accumulates in the bottom plate and exceeds a certain amount, a controller is provided to perform alarm and forced operation, forced closing of the electronic expansion valve 29, stop of the compressor of the outdoor unit 27, etc. by a dew condensation sensor (not shown). Built into the program.
[0037]
In order to ensure the dry coil operation of such a local cooling device 21, an outside air processing unit 31 is installed in the equipment room R. The outside air processing unit 31 includes a cooling coil 32 and a blower 33, for example, and is configured to supply the inside air OA into the equipment room R after adjusting the humidity.
[0038]
In the equipment room R, a package air conditioner 34 is further installed. This package air conditioner 34 is a conventional all-sensible heat treatment type package air conditioner, and includes a direct expansion coil 35 and a blower 36, and is connected to an outdoor unit 37 by a refrigerant pipe 38. In the underfloor chamber 11, for example, conditioned air of about 15 ° C. to 20 ° C. is supplied. The package air conditioner 34 is disposed on the wall surface of the equipment room R, and plays an auxiliary role in air conditioning other than the passage space X and cooling of the passage space X.
[0039]
The air conditioning system according to the present embodiment is configured as described above, and the exhaust heat from each rack L is exhausted above the rack L by the blower 1 above the rack L, and the air in the upper part of the equipment room R is exhausted. At the same time, it is sucked from the suction port 23 of the local cooling device 21 and is cooled by the cooling coil 26. Cooled air, for example, cooling air of 18 ° C., is blown out toward the floor surface F of each passage space X by the blower 24.
[0040]
The cooling air is introduced into the rack L through the opening 4 provided in the front surface of the rack L and processes the exhaust heat of the equipment 2. On the other hand, conditioned air from the package air conditioner 34, for example, air of 15 ° C. to 20 ° C., is blown into the underfloor chamber 11, and the conditioned air flows into the rack L through the opening 12 at the bottom of the rack L, and the equipment 2 To handle the exhaust heat. The conditioned air from the underfloor chamber 11 is also blown into the passage space X from the opening 14 provided in the floor surface F of the passage space X, and the rack L from the opening 4 provided in the front of the rack L. The exhaust heat of the equipment 2 is processed by being introduced inside. Therefore, the cooling effect of the equipment 2 inside the rack L is improved in each stage as compared with the conventional art. In this case, the static pressure in the underfloor chamber 11 is higher than the static pressure in the equipment room R.
[0041]
FIG. 3 shows a case where the static pressure in the underfloor chamber 11 is lower than the static pressure in the equipment room R. This is because the total displacement of the blower 1 in all racks L is increased, and all the sensible heat treatment is performed. Occurs when the total air flow of the package air conditioner 34 is exceeded. In this case, the air flow in the openings 13 and 14 on the floor surface leading to the underfloor chamber 11 is directed from the inside of the equipment room R to the underfloor chamber 11. The conditioned air in the passage space X is sucked into the rack L from the opening 4 provided on the side surface of the rack L, and once sucked into the lower floor chamber 11 from the opening 14 on the floor surface, There is a flow of air that is sucked into the rack L from the opening 12 at the bottom. In this case, by increasing the area and opening ratio of the opening 14 on the floor surface F of the passage space X, a more local air circulation can be formed, so that the air mixing loss is reduced.
[0042]
Further, in the present embodiment, since the outside air processing unit 31 is installed in the equipment room R, it is possible to reliably perform the dry coil operation of the local cooling device 21 and suppress the occurrence of condensation as much as possible. It has been.
[0043]
In the present embodiment, the local cooling device 21 is structurally separated from each rack row, so that it is excellent in terms of workability in addition work to existing facilities. When the heat generation amount of the rack L in a part of the equipment room R increases, the local cooling device 21 may be installed only in the area where the heat generation amount increases. Is also possible. In such a case, the construction is easy. Also, when performing maintenance of the local cooling device 21 itself, workability is good because the area around the local cooling device 21 is an open space.
[0044]
FIG. 4 shows a temperature control method of the local cooling device 21 in the passage space portion X and an example of adjustment of the airflow shape, and shows a state in a certain passage space portion X. In this example, the local cooling devices 21a to 21e are installed at equal intervals along the rack row. Then, the temperature in the passage space portion X below is detected by the temperature sensor T, and control is performed by a control device (not shown) so that the cooling capacity is adjusted so as to approach the set temperature. For example, when one local cooling device 21b fails, the temperature of the surrounding passage space X also rises, but other local cooling devices 21a and local cooling devices 21c adjacent to the failed local cooling device 21b. By increasing the cooling capacity, the temperature rise of the passage space portion X becomes slight. Further, in this example, the blowing position of the opening 14 of the floor surface F in the passage space X is arranged at a position between the local cooling devices 21 when viewed from the plane, and the conditioned air from the local cooling devices 21a to 21e. The amount of conditioned air in an area where the supply amount of air is relatively small can be compensated.
Moreover, you may make it implement the temperature adjustment of the exhaust_gas | exhaustion from the rack L by controlling the working number of the air blowers 24 of the local cooling devices 21a-21e. For example, when the load is small, it can be dealt with more practically.
[0045]
FIG. 5 shows an example in which a package air conditioner 41 for latent heat treatment is installed in addition to the air conditioner 31. Normally, the intake outside air OA is supplied to the equipment room R after the humidity is adjusted by the external air conditioner 31. In order to perform the dry coil operation of the local cooling device 21, the indoor dew point temperature control is important, but in the unlikely event that the external air conditioner 31 breaks down or the performance deteriorates, there are a small number of package air conditioners 41 for latent heat treatment. is set up.
[0046]
Refrigerant evaporation temperature T in cooling coil of package air conditioner 41 for latent heat treatment _S , The refrigerant evaporation temperature T of the local cooling device 21 _E Lower than the set dew point temperature T _R Higher than (T _E > T _S > T _R Thus, the humidity can be adjusted when the external air conditioner 31 is abnormal. The number of package air conditioners 41 for latent heat treatment is, for example, a heat generation density of 1000 W / m. ² When the outside air intake rate is about 0.5 times per hour in the equipment room R, the package air conditioner 41 for latent heat treatment having a capacity of about 5% of the cooling capacity of the entire room may be installed, as shown in the figure. The package air conditioner 41 for latent heat treatment may be installed by replacing a part of the all sensible heat treatment type package air conditioner 35 installed on the wall surface.
[0047]
In the above example, the floor on which the rack L is installed is a double floor, but the present invention is also applicable to a room without a double floor as shown in FIG. In this case, the packaged air conditioner 34 is configured to have an upper blowout and a lower suction, similar to the external air conditioner 31. By applying the present invention to a room without such a double floor, the cooling capacity can be increased. Therefore, the present invention can easily cope with an existing equipment room.
[0048]
In the above example, the package air conditioner 41 for latent heat treatment is installed in the equipment room R together with the outside air treatment unit 31 in order to ensure the dry coil operation of the local cooling device 21. The dry coil operation is carried out by changing the operation control of some of the packaged air conditioners 34a of the packaged air conditioners 34, as shown in FIG. Condensation of the cooling coil of the local cooling device 21 may be prevented.
[0049]
That is, the control target value of the refrigerant evaporation temperature of the packaged air conditioner 34a is set to be lower than the control target value of the refrigerant evaporation temperature of the other packaged air conditioner 34, and the moisture in the equipment room R is preferentially used. Condensation is performed with a cooling coil. As a result, an increase in the dew point temperature in the equipment room R is suppressed, and the refrigerant evaporation temperature is controlled at a substantially constant value, so that the amount of dehumidification becomes excessive and the dew point temperature does not fall below the set value. .
[0050]
Further, as another example of the operation method of these air conditioners, for example, by reducing the processing air volume of the package air conditioner 34, it can be used as a package air conditioner for dehumidification. That is, even with the same cooling coil specifications, by reducing the processing air volume, the refrigerant evaporation temperature can be easily maintained lower than that of the packaged air conditioner 34, so that a preferable operating state is achieved in the practice of the present invention. Since the packaged air conditioner 34a has the function of changing the air volume and the function of changing the control target value of the refrigerant evaporation temperature, the same air conditioner can be used in terms of hardware. Each packaged air conditioner 34 can be changed to a sensible heat treatment type or for dehumidification depending on the ratio of the latent heat load), and the flexibility is increased.
[0051]
In the high sensible heat treatment type packaged air conditioner (multi-type) in which a plurality of indoor units are connected to one indoor unit, the number of indoor units to be operated can be reduced in addition to the change in the processing air volume described above. It is also possible to easily keep the evaporation temperature low.
[0052]
FIG. 8 shows an example in which the cooling coil surface temperature corresponding to the intake air temperature of a certain packaged air conditioner is calculated for each refrigerant evaporation temperature. The surface temperature of the cooling coil is mainly determined by the refrigerant evaporation temperature, the processing air temperature, and the heat transfer coefficient inside and outside the cooling coil. Note that the heat transfer coefficient outside the cooling coil varies depending on the passing wind speed of the cooling coil.
The surface temperature of the cooling coil is expressed by equation (1) when the heat transfer resistance is ignored.
t _w = T _in + H _out / (H _in + H _out ) X (T _out -T _in ) ... (1)
here,
t _w : Cooling coil surface temperature [℃]
t _in : Average temperature of cryogenic fluid (refrigerant) [℃]
T _out : Average temperature of hot fluid (air) [℃]
h _in : In-pipe surface heat transfer coefficient [kW / (m ² K)]
h _out : Heat transfer coefficient of tube outer surface [kW / (m ² K)]
[0053]
For example, when the refrigerant evaporating temperature of the dehumidifying package air conditioner 34a is operated at 6 ° C. under the condition that the processing air temperature (suction air temperature) is 27 ° C., the cooling coil surface temperature becomes 12 ° C. The passing air is cooled on the surface of the cooling coil and dehumidified until the dew point temperature reaches about 12 ° C. Therefore, the same trial calculation is performed for the other packaged air conditioners 34, and if the control target value of the refrigerant evaporation temperature is set so that the cooling coil surface temperature is higher than 12 ° C., it is always possible to operate with a dry coil. . It is also possible to change the dew point temperature of the room air by arbitrarily changing the refrigerant evaporation temperature of the packaged air conditioner 34a.
[0054]
In addition, some of the packaged air conditioners 34a for dehumidification can be operated continuously regardless of the room temperature except when the dew point temperature of the room air is lower than the set value. The operation may be stopped only when the temperature is lower than the set value and the temperature of the room air is lower than the set value.
[0055]
The local cooling device used in the above embodiment has a configuration in which the suction ports 23 are provided on both sides and the cooling coil 26 is also provided vertically in the same direction as the suction ports 23. However, the local cooling device that can be applied in the above is not limited to such a configuration. For example, both the inlet and outlet are directed in the direction facing the floor, and both the inlet and outlet are arranged along the longitudinal direction of the space and passage space, and the cooling coil is also installed in the local cooling device. Of course, it is possible to use a type that is arranged in the chamber at right angles to the direction of the airflow flowing from the inlet to the outlet. In this case, a sirocco fan can also be used as the blower. In the local cooling device having such a configuration, a drain pan installed below the cooling coil is also easy to install.
[0056]
【The invention's effect】
ADVANTAGE OF THE INVENTION According to this invention, in a facility with a high-density waste heat from a communication / information processing apparatus, an appropriate waste heat treatment can be performed under space saving and energy saving. Moreover, work such as maintenance is easy. Further, according to the air conditioning method of the present invention, it is possible to easily implement low-cost and high-flexibility humidity control by simply adding the functions of the air-conditioning equipment and devising the operation method in the facility.
[Brief description of the drawings]
FIG. 1 is an explanatory diagram showing an outline of an equipment room to which an air conditioning system according to an embodiment of the present invention is applied.
FIG. 2 is an explanatory diagram showing a state when conditioned air is taken into a rack in the air conditioning system according to the embodiment of FIG. 1;
FIG. 3 is an explanatory diagram showing air flow when the static pressure in the underfloor chamber is lower than the static pressure in the equipment room in the air conditioning system according to the embodiment of FIG. 1;
FIG. 4 is a side view showing the inside of a passage space for explaining an example of operation control in the present invention.
FIG. 5 is an explanatory diagram showing an outline of an equipment room to which an air conditioning system according to another embodiment of the present invention is applied.
FIG. 6 is an explanatory diagram showing an example in which the present invention is applied to an equipment room without a double floor.
FIG. 7 is an explanatory diagram showing an outline of an equipment room to which an air conditioning system according to another embodiment of the present invention is applied.
FIG. 8 is a graph showing the relationship between the dry-bulb temperature of processing air and the cooling coil surface temperature.
FIG. 9 is an explanatory diagram of a prior art.
FIG. 10 is a perspective view showing an outline of a general communication / information processing equipment room.
[Explanation of symbols]
1 Blower
2 Equipment
4 openings
11 Underfloor chamber
12, 13, 14 opening
21 Local cooling system
22 Air outlet
23 Suction port
26 Cooling coil
27 Outdoor unit
31 Outside air treatment unit
34 Packaged air conditioner
A, B, C, D Rack row
F Floor
L rack
R Equipment room
X passage space
Y space

Claims (17)

A system that air-conditions a communication / information processing equipment room where multiple racks are installed, with racks with communication / information processing equipment mounted in the vertical direction and arranged in a row.
Above the spaces formed between the rack rows, a local cooling device for cooling the spaces is arranged structurally separated from the rack rows,
The local cooling device has an air outlet provided so as to face the floor surface of the communication / information processing equipment room, and a suction port for taking in air in an upper space in the communication / information processing equipment room. An air conditioning system for communication / information processing equipment rooms. Of the spaces formed between the racks, the space formed for every two rack rows facing each other is used as a passage space, and the local cooling device is disposed only above the passage space. The air conditioning system for a communication / information processing equipment room or the like according to claim 1. 2. The rack according to claim 1, wherein the rack has an opening at a portion facing the space, and a blower for exhausting the atmosphere in the rack to the outside of the rack is provided at an upper portion of the rack. An air conditioning system such as a communication / information processing equipment room described in 1. The rack has an opening in a portion facing the passage space, and a blower for exhausting the atmosphere in the rack to the outside of the rack is provided at the top of the rack. 2. An air conditioning system such as a communication / information processing equipment room according to 2. The rack has an opening in a portion facing the space,
Further, the communication / information processing equipment mounted on the rack has a unique blower, and the supply / exhaust direction of each blower is uniform among the communication / information processing equipment mounted on the rack. The air conditioning system for a communication / information processing equipment room or the like according to claim 1 characterized by the above. The rack has an opening in a portion facing the passage space,
Further, the communication / information processing equipment mounted on the rack has a unique blower, and the supply / exhaust direction of each blower is uniform among the communication / information processing equipment mounted on the rack. The air conditioning system of a communication / information processing equipment room or the like according to claim 2 characterized by the above. The rack is installed on a double floor constituting an underfloor chamber, and an opening leading to the underfloor chamber is formed on a floor surface in a space formed between rack rows. An air conditioning system such as a communication / information processing equipment room according to any one of 1, 2, 3, 4, 5, and 6. 8. The air conditioning system for a communication / information processing equipment room or the like according to claim 7, wherein an opening communicating with the underfloor chamber is formed in a floor surface facing the lower surface of the rack. 9. The communication / information processing equipment room according to claim 7 or 8, further comprising an air amount adjusting mechanism for adjusting an air amount passing through the opening in the opening communicating with the underfloor chamber. Air conditioning system. A plurality of blowers for exhausting the atmosphere inside the rack at the top of the rack to the outside of the rack are installed, and the number of the blowers is controlled in order to keep the temperature of the exhaust below a set temperature. Item 10. An air conditioning system for a communication / information processing equipment room or the like according to any one of items 3, 4, 5, 6, 7, 8, or 9. The cooling capacity of each local cooling device is controlled based on the measurement result of the temperature of the space formed between the lower rack rows for each local cooling device. , 3, 4, 5, 6, 7, 8, 9, or 10 An air conditioning system for a communication / information processing equipment room or the like. The said local cooling device has a direct expansion coil as a cooling means, Furthermore, the refrigerant | coolant evaporation temperature of the said direct expansion coil is controlled higher than the dew point temperature of process air, The 1, 2 characterized by the above-mentioned. An air conditioning system such as a communication / information processing equipment room according to any one of 3, 4, 5, 6, 7, 8, 9, 10 or 11. The air conditioning system for a communication / information processing equipment room or the like according to claim 12, further comprising an air conditioning device for adjusting the humidity of the atmosphere in the communication / information processing equipment room or the like. An air-conditioning method performed using an air-conditioning system such as a communication / information processing equipment room according to any one of claims 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 or 12. ,
A plurality of air conditioners for supplying conditioned air to the communication / information processing equipment room, etc.
Each of these air conditioners incorporates a direct expansion type cooling coil,
The control target value of the refrigerant evaporation temperature of some of the air conditioners is set lower than the control target value of the refrigerant evaporation temperature of the other air conditioners,
An air conditioning method characterized in that when the dew point temperature of indoor air becomes higher, the cooling coils of the partial air conditioners are preferentially condensed. The dew point temperature of the room air is changed by changing the set value of the refrigerant evaporation temperature of the some air conditioners within a range lower than the set value of the refrigerant evaporating temperature of the other air conditioners. The air conditioning method according to claim 14. 16. The air conditioning method according to claim 14 or 15, wherein the some air conditioners continuously operate regardless of the room temperature except when the dew point temperature of the room air falls below a set value. . The said some air conditioners stop operation | movement only when the dew point temperature of room air is less than a preset value, and the temperature of room air falls below a preset value, The 14, 15 or 16 characterized by the above-mentioned. The air-conditioning method in any one of.

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