JP4302461B2 - Air conditioning system - Google Patents

Description

  The present invention relates to an air conditioning system mainly installed in a room where a device having a high heat generation density such as a communication device is installed.

  An air conditioning system is indispensable for the communication device and the computer to maintain the allowable humidity temperature range. Since the communication device generates heat throughout the year, the air conditioner is also required to perform an annual cooling operation. In these air conditioning systems, an individual cooling type annual cooling type package air conditioner is used from the viewpoint of reliability and flexibility.

  In order to store communication cables such as communication devices and to construct an efficient air-conditioning airflow method, these air-conditioning rooms are generally provided with a double floor. Accordingly, the communication device is installed on the double floor and the communication cable is laid on the double floor. In order to cool the communication device, the air conditioner sends cold air into the double floor, supplies cold air from the lower or front surface of the device, removes heat from the communication device, and is returned.

  As for the air conditioners constituting these systems, the indoor units of the packaged air conditioners are installed along the periphery of the inner wall of the room according to the cooling load, and the outdoor units are installed on the rooftop or the veranda. Further, since the communication device is strictly prohibited to enter moisture, the air conditioner is generally a direct expansion type. The communication device includes a forced air cooling device that has a blower and a natural air cooling device that does not have a blower, and the necessary cooling heat and air volume are supplied from the air conditioning indoor unit. With such an air conditioning system, the room in which the communication device is accommodated is cooled, and the operating temperature condition of the communication device is maintained.

However, in recent years, computerization has progressed at an accelerated rate, and the integration density of communication devices has increased correspondingly, and heat generation per unit area has rapidly increased. Devices that have a heat generation density of 1000 W / m ² which has been about several hundred W / m ^{2 at the} maximum have started to be introduced. Along with these high heat generation, the communication device itself is equipped with a large air volume blower to remove heat from the device itself. Since these devices have different calorific values and airflows, devices having different amounts of cooling and airflow in the same zone are mixed.

  On the other hand, since the installation place of an air conditioner indoor unit is limited as described above, both supply cold heat and supply air volume are limited. Since each communication apparatus or each storage rack has a blower, there arises a problem that the entire air volume cannot be balanced, or the air volume cannot be supplied so that air at an appropriate temperature is sucked into the apparatus. This is because the basic idea of the conventional air conditioning system is horizontal plane “supply” air conditioning, so it is difficult to make the “result” uniform when a part of the air-conditioned plane has high heat generation and large air volume. It is to become. Due to these problems, there is a risk that the allowable device operation temperature cannot be maintained locally.

  In order to cope with these problems, it is conceivable that the cooling capacity and the air volume are provided with a certain margin in advance so that a device having a certain range of heat generation and air volume can be accommodated wherever it enters. However, there are problems such as a high initial cost, a lot of energy waste, an increase in operating cost, and a bad environment.

In order to solve these problems, in Patent Document 1, an air conditioner indoor unit that performs cold supply using the above-described conventional double floor and a local cooling device hung on the upper part of the device in the rack are provided side by side. A method of cooling the device and a method of partitioning the communication device with a wall and removing heat are adopted.
JP 2002-156136 A

However, in the technique of Patent Document 1, the local cooling device and the air conditioner indoor unit are individually controlled, and are not electrically and mechanically linked and controlled, and the local cooling device has a function of adjusting humidity. do not have. When adjusting the humidity around the local cooling device, the air conditioner indoor unit is used to adjust the humidity. At this time, the operator manually sets the local cooling device and the air conditioner indoor unit. Yes. For this reason, the air conditioner indoor unit operates regardless of the temperature and humidity around the local cooling device, and there is a possibility that condensation occurs in the local cooling device. In addition, because the local cooling device and the air conditioner indoor unit are not linked, the air conditioner indoor unit is excessively dehumidified, and wasteful energy is lost even though the local cooling device is not in a temperature or humidity condition that causes condensation. There is a risk of consumption.
In the above-described technology, since the local cooling device and the air conditioner indoor unit are not linked, when the local cooling device stops operation due to a failure or the like, a high temperature failure may occur in the local cooling device. Also, regarding the temperature control in the local cooling device, if the desired temperature condition in the local cooling device cannot be satisfied, the periphery of the local cooling device gradually becomes high temperature, causing a treble failure in the local cooling device. There is a risk that.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide an air conditioning system capable of automatically adjusting temperature and humidity in an appropriate rack or communication equipment room. .

The present invention has been made to solve the above-described problems, and includes an indoor air conditioner that air-conditions a room in which one or more equipment storage racks are installed, an evaporator, and a blower, and is arranged in the rack. A cooling unit, a condenser provided outdoors or indoors, and a pump for sending refrigerant output from the condenser to the evaporator, the condenser, the pump, and the evaporator of the cooling unit And a local cooling device that cools the inside of the rack with cold air from the blower, a dew point temperature detecting unit that detects a dew point temperature of air sucked from an air suction port of the local cooling device, and the local A refrigerant evaporating temperature detecting means for detecting an evaporating temperature of the refrigerant in the evaporator of the cooling device; an evaporating temperature detected by the refrigerant evaporating temperature detecting means; and a detection of the dew point temperature detecting means. A controller for instructing control in which the local cooling device and the dehumidifying capacity of the indoor air conditioner are linked based on the dew point temperature to be emitted, and the controller includes at least one of the local cooling devices, The evaporating temperature detected by the refrigerant evaporating temperature detecting means is not more than a first predetermined temperature higher than the dew point temperature detected by the dew point temperature detecting means, and the local cooling device When the control state of the evaporating temperature indicates an upper limit, an instruction to increase the dehumidifying capacity of the indoor air conditioner is given.

Further, the present invention is the above air conditioning system, wherein the controller is configured such that the evaporating temperature detected by the refrigerant evaporating temperature detecting means in all of the local cooling devices respectively provided in the plurality of equipment storage racks, When the temperature is equal to or higher than the second predetermined temperature exceeding the first predetermined temperature above the dew point temperature, and when the control state of the evaporation temperature of the local cooling device indicates a lower limit, An instruction to reduce the dehumidifying capacity of the indoor air conditioner is given.

The present invention further includes a failure detection means for detecting a failure state of the local cooling device in the air conditioning system described above, wherein the controller detects a failure state detected by the failure detection means and a dew point detected by the dew point temperature detection means. Control of the dehumidifying capacity of the indoor air conditioner is instructed based on the temperature and the evaporation temperature detected by the refrigerant evaporation temperature detecting means.

According to the present invention, in the at least one local cooling device, the controller has an evaporating temperature detected by the refrigerant evaporating temperature detecting means equal to or lower than a temperature higher by a first predetermined temperature than the dew point temperature detected by the dew point temperature detecting means. If the control state of the evaporation temperature of the local cooling device indicates the upper limit, an instruction to increase the dehumidifying capacity of the indoor air conditioner is given. As a result, the dew point temperature detected by the dew point temperature detecting means is lowered, and the evaporation temperature detected by the refrigerant evaporation temperature detecting means rises to a temperature higher than the first predetermined temperature higher than the dew point temperature. Therefore, condensation in the local cooling device can be prevented.

Further, according to the present invention, in all of the local cooling devices provided in each of the plurality of device storage racks, the controller detects that the evaporation temperature detected by the refrigerant evaporation temperature detection means is a first predetermined value higher than the dew point temperature. An instruction to reduce the dehumidifying capacity of the indoor air conditioner when the temperature is higher than the second predetermined temperature exceeding the temperature of the local air conditioner and when the control state of the evaporation temperature of the local cooling device indicates a lower limit To do. As a result, the dew point temperature detected by the dew point temperature detecting means is increased, so that the evaporation temperature detected by the refrigerant evaporation temperature detecting means falls below a temperature that is higher than the dew point temperature by a second predetermined temperature. Therefore, it is possible to automatically prevent excessive consumption of energy in the air conditioning system by excessively increasing the dehumidifying capacity of the indoor air conditioner.

Further, according to the present invention, the apparatus includes a failure detection unit that detects a failure state of the local cooling device, and the controller detects a failure state detected by the failure detection unit, a dew point temperature detected by the dew point temperature detection unit, and the Control of the dehumidification capacity of the indoor air conditioner is instructed based on the evaporation temperature detected by the refrigerant evaporation temperature detecting means. Thereby, even if a local cooling device has failed, the indoor air conditioner can be automatically controlled to reduce the humidity inside the local cooling device.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a schematic configuration diagram showing a configuration of an air conditioning system according to the embodiment. In this figure, reference numeral 1 denotes a rack (equipment storage rack) installed in a communication equipment room, and an IP device 2 such as a server and a router and other communication equipment are installed in the rack 1. 3 is a base air conditioner (indoor air conditioner) that is installed on the wall surface of the communication equipment room and air-conditions the entire communication equipment room. After cooling or adjusting the humidity of the air circulated through the air intake port, Cool air is blown out of the double floor of the communication equipment room from the air vent. The blown cold air is blown from the bottom of each rack 1 or blown from the opening of the front floor panel of the rack 1 and supplied to the IP device 2 installed in the rack 1. Then, the air warmed by the heat generated by the IP device 2 flows from the upper part of the rack 1 to the inlet of the upper part of the base air conditioner 3. A plurality of racks 1 are installed in the communication equipment room.

  Reference numeral 6 denotes a local cooling device, a cooling unit 7 disposed in the rack 1, a condenser 8 installed outside the communication equipment room, a refrigerant pump 9 and piping connecting them, and a control for controlling the refrigerant pump 9. Part (cooling capacity output state detection means) 10. The control unit 10 detects the output state of the cooling capacity of the local cooling device 6 and the evaporation temperature control state for controlling the evaporation temperature of the refrigerant in the evaporator of the local cooling device 6. Here, the output state of the cooling capacity refers to the cooling capacity of the local cooling device 6 (for example, the amount of cool air blown out by the local cooling device 6 or the efficiency when the local cooling device 6 cools the air by heat exchange). This is information indicating the level. In addition, when the local cooling device 6 includes the condenser 8, the refrigerant pump 9, and the cooling unit 7, the evaporation temperature control state is determined from the rotation speed of the refrigerant pump 9 and the temperature of the condenser heat exchange medium. If the local cooling device 6 is composed of a condenser 8, an expansion valve, and a compressor, the information is shown from the opening degree of the expansion valve, the frequency of the compressor, and the temperature of the condenser heat exchange medium. Information. Then, the control unit 10 of the local cooling device 6 determines which level the cooling capacity of the local cooling device 6 is operating from the lower limit to the upper limit, and at which level the local cooling device 6 is operated from the lower limit to the upper limit. It is memorized whether it is driving by controlling.

  This local cooling device 6 is a device that individually cools each rack 1, and a cooling unit 7 composed of an evaporator and a blower is provided at an appropriate position of the rack 1, for example, a lower part, a middle part, an upper part, or a bottom plate in the rack 1, It is arranged on the top plate or in the upper part of the passage between the rack 1 and the rack 1. The cooling unit 7 cools the air sucked from the air suction port by a blower using an evaporator, and sends out the cold air from the blowout port. Here, when the cooling unit 7 is at the upper part in the rack 1, for example, the cooling unit 7 sends out cool air to the lower side of the rack 1. When the cooling unit 7 is in the lower part of the rack 1, the cooling unit 7 sends out cool air upward in the rack 1. Reference numeral 11 denotes a controller that instructs the local cooling device 6 and the base air conditioner 3 to increase the cooling capacity or to decrease the cooling capacity.

  In such a configuration, first, the refrigerant pump 9 applies pressure to the liquid refrigerant supplied from the condenser 8 and sends the liquid refrigerant into the pipe. The delivered liquid refrigerant is supplied to the evaporator of the cooling unit 7, and the evaporator absorbs ambient heat and vaporizes, and the vaporized refrigerant gas is sent to the condenser 8 through the pipe. The condenser 8 cools and liquefies the refrigerant gas, and sends the refrigerant liquid resulting from this liquefaction to the refrigerant pump 9 again. The local cooling device 6 adjusts the temperature in the rack 1, and the base air conditioner 3 adjusts the temperature and humidity in the rack 1 and the communication device room.

  FIG. 2 is a diagram illustrating a configuration example of the cooling unit. The cooling unit 7 shown in this figure cools the air sucked from the lower surface by a heat exchanger inside the evaporator, and blows out the cooled air from the upper surface having the cold air outlet through the blower. A thermometer T1 (control temperature detecting means) is disposed near the cold air outlet of the cooling unit 7. This thermometer T1 detects the temperature of the cold air outlet. The thermometer T1 is not limited to the cold air outlet of the cooling unit 7, and may be installed at either the air suction port of the cooling unit 7 or an arbitrary location in the rack, and the air at the installed location. Detect the temperature.

  Further, the heat exchanger inside the evaporator of the cooling unit 7 is provided with a dew point thermometer R1 (dew point temperature detecting means) for detecting the dew point temperature of the sucked air near the air suction port of the cooling unit 7. Yes. The heat exchanger inside the evaporator of the cooling unit 7 is provided with a thermometer T2 (refrigerant evaporation temperature detecting means) for detecting the surface temperature of the heat exchanger. Here, the surface of the heat exchanger is a place where the air sucked from the air suction port comes into contact, and the heat exchanger inside the evaporator absorbs the heat of the air. The cooling unit 7 may have a configuration in which an air suction port is provided on the upper surface and a cold air blowing port is provided on the lower surface, or a configuration in which a front air suction port is provided and a cold air blowing port is provided on the back surface.

  FIG. 3 is a diagram showing functional blocks of the controller. In this figure, reference numeral 101 denotes a local cooling device control unit that reads the temperature of the cold air sent from the cooling unit 7 from the thermometer T1 and notifies the local cooling device 6 of a control instruction. Reference numeral 102 denotes a base air conditioner control unit that instructs to control the humidity, temperature, air volume, etc. of the cold air sent out by the base air conditioner 3. Reference numeral 103 denotes a temperature storage unit that stores a reference temperature or the like for the controller to give a control instruction in which the cooling unit 7 and the base air conditioner 3 are linked. Reference numeral 104 denotes an operation determination processing unit that instructs the base air conditioner control unit 102 to perform an operation.

  The controller 11 includes a thermometer T1 installed near the cold air outlet of the cooling unit 7, a thermometer T2 that detects the surface temperature of the heat exchanger inside the evaporator, and an air suction port of the cooling unit 7. Read the temperature indicated by the dew point thermometer R1 installed by the side. Further, the controller 11 receives a notification from the control unit 10 of the local cooling device 6 about the output state of the cooling capacity of the local cooling device 6 and the control state of the evaporation temperature. Then, when the local cooling device 6 controlled by the local cooling device control unit 101 has the control state of the cooling capacity or the evaporation temperature exceeding either the upper limit or the lower limit, the operation determination processing unit 104 causes the base air conditioner 3 to The operation is determined and notified to the base air conditioner control unit 102. Then, based on the operation determined by the operation determination processing unit 104, the base air conditioner control unit 102 instructs the base air conditioner 3 to perform control. The base air conditioner 3 increases or decreases the output state of the cooling capacity based on an instruction from the base air conditioner control unit 102.

Next, processing of the controller 11 will be described.
(A) Control of the temperature near the outlet of the cooling unit First, the administrator of the communication equipment room preliminarily controls the temperature in the rack 1 or the communication equipment room based on the thermometer T1, the thermometer T2, and the dew point thermometer R1. A reference temperature for managing the humidity and humidity is set and registered in the controller 11. The temperature storage unit 103 stores the reference temperature value registered by the administrator. Here, a plurality of racks 1 exist in the communication equipment room, and a cooling unit 7 of the local cooling device 6 is installed in each rack 1. And the local cooling device control part 101 reads the temperature of each thermometer T1 installed near the cold air outlet of each cooling unit 7, and the reference temperature memorize | stored in the temperature memory | storage part 103, and always compares them.

And when the temperature of one thermometer T1 is higher than the reference temperature memorize | stored in the temperature memory | storage part 103 among one thermometer T1 installed in each rack 1 of a communication equipment room, the This is notified to the operation determination processing unit 104. Next, the operation determination processing unit 104 notifies the local cooling device control unit 101 to confirm the output state of the cooling capacity of the local cooling device 6. And the local cooling device control part 101 requests | requires the notification of the output state of a cooling capability from the control part 10 of the local cooling device 6. FIG. The control unit 10 of the local cooling device 6 notifies the output state of the cooling capacity to the localized cooling device control unit 101 of the controller 11. The localized cooling device controller 10 1 notifies the information notified from the control unit 10 to the operation determining process unit 104.

Then, when the temperature of the thermometer T1 is higher than the reference temperature and the output state of the cooling capacity of the local cooling device 6 indicates the upper limit, the operation determination processing unit 104 sends the base air conditioner 3 to the base air conditioner control unit 102. An instruction is given to increase the cooling capacity by lowering the temperature of the cool air to be sent out or increasing the air volume of the cool air. Then, the base air conditioner control unit 102 instructs the base air conditioner 3 to increase the cooling capacity by lowering the temperature of the cool air or increasing the air volume of the cool air. In this way, the controller 11 instructs the base air conditioner 3 to control the temperature of the communication equipment room so that none of the thermometers T1 in each rack 1 indicates the reference temperature or higher.
When the temperature of the thermometer T1 is higher than the reference temperature and the output state of the cooling capacity of the local cooling device 6 is not the upper limit, the operation determination processing unit 104 sends the cooling capacity to the local cooling device control unit 101. And the local cooling device control unit 101 instructs to increase the cooling capacity of the local cooling device 6.

Further, the local cooling device control unit 101 of the controller 11 monitors whether or not the temperature of the thermometer T1 has fallen below a predetermined temperature. Here, the temperature storage unit 103 stores a temperature (lower limit temperature) that is several degrees (for example, 2 degrees) lower than the reference temperature. Then, when the temperature indicated by all the thermometers T1 in the communication equipment room is equal to or lower than the reference temperature stored in the temperature storage unit 103, the local cooling device control unit 101 notifies that fact. The operation determination processing unit 104 is notified. Next, the operation determination processing unit 104 notifies the local cooling device control unit 101 to confirm the output state of the cooling capacity of the local cooling device 6. And the local cooling device control part 101 requests | requires the notification of the output state of a cooling capability from the control part 10 of the local cooling device 6. FIG. Then the control unit 10 of the local cooling device 6 notifies the output state of the cooling capacity to the localized cooling device control unit 101 of the controller 11. The localized cooling device controller 10 1 notifies the information notified from the control unit 10 to the operation determining process unit 104.

Then, the operation determination processing unit 104 has the temperature of the thermometer T1 equal to or lower than the lower limit temperature that is several degrees lower than the reference temperature stored in the temperature storage unit 103, and the output state of the cooling capacity of the local cooling device 6 indicates the lower limit. In this case, the base air conditioner control unit 102 is notified to perform either an instruction to increase the temperature of the cool air sent out by the base air conditioner 3 or an instruction to decrease the air volume of the cool air. Then, the base air conditioner control unit 102 instructs the base air conditioner 3 to decrease the cooling capacity by increasing the temperature of the cool air or decreasing the air volume of the cool air. In this way, excessive cooling of the communication equipment room and the rack 1 by the base air conditioner 3 is prevented.
When the temperature of the thermometer T1 is equal to or lower than the lower limit temperature that is several degrees lower than the reference temperature, and the output state of the cooling capacity of the local cooling device 6 is not the lower limit, the operation determination processing unit 104 controls the local cooling device. The unit 101 is instructed to reduce the cooling capacity, and the local cooling device control unit 101 instructs the local cooling device 6 to reduce the cooling capacity.

(B) Control of Condensation Prevention in Evaporator Next, the processing of the controller when performing prevention of condensation in the evaporator will be described.
First, the local cooling device controller 101 of the controller 11 constantly monitors the dew point temperature detected by the dew point thermometer R1 installed in the cooling unit 7 of each rack 1 and the temperature detected by the thermometer T2. When the temperature detected by the thermometer T2 falls below, for example, 3 degrees (first predetermined temperature) higher than the dew point temperature detected by the dew point thermometer R1, the local cooling device control unit 101 , This is notified to the operation determination processing unit 104. Or next operation determination processing unit 104, controls the state of the evaporation temperature of the localized cooling device 6 to a local cooling device controller 10 1 (e.g., in what level the temperature of the rotating speed and condenser heat exchange medium of the coolant pump 9 To confirm). The localized cooling device controller 10 1 requests a notification of control state of the evaporating temperature from the control unit 10 of the local cooling device 6. The control unit 10 of the local cooling unit 6 notifies a control state of the evaporating temperature to the localized cooling device control unit 101 of the controller 11. The localized cooling device controller 10 1 notifies the information notified from the control unit 10 to the operation determining process unit 104.

  Next, the operation determination processing unit 104 determines that the temperature detected by the thermometer T2 is not more than 3 degrees higher than the dew point temperature detected by the dew point thermometer R1, and the control state of the evaporation temperature of the local cooling device 6 is When the upper limit is indicated, the base air conditioner control unit 102 is notified to increase the dehumidifying capacity by the base air conditioner 3. Then, the base air conditioner control unit 102 instructs the base air conditioner 3 to increase the dehumidifying capacity. As a result, the base air conditioner 3 performs a dehumidifying operation to dehumidify the air in the communication device room. Then, the dew point temperature detected by the dew point thermometer R1 decreases and the temperature detected by the thermometer T2 becomes higher than the dew condensation prevention temperature, so that dew condensation inside the evaporator can be prevented in advance.

  The operation determination processing unit 104 controls the evaporation temperature of the local cooling device 6 when the temperature detected by the thermometer T2 is equal to or lower than a temperature that is 3 degrees higher than the dew point temperature detected by the dew point thermometer R1. Is not the upper limit, the local cooling device control unit 101 is instructed to increase the evaporation temperature control state, and the local cooling device control unit 101 instructs the local cooling device 6 to increase the evaporation temperature control state. Thus, the surface temperature of the heat exchanger in the evaporator is increased. As a result, the temperature detected by the thermometer T2 rises above the dew condensation prevention temperature, so that dew condensation can be prevented.

Further, the local cooling device control unit 101 of the controller 11 monitors whether or not the dew point temperature of the air at the air suction port of the cooling unit 7 is low.
At this time, the local cooling device control unit 101 of the controller 11 constantly monitors the dew point temperature detected by the dew point thermometer R1 and the temperature detected by the thermometer T2, and the temperature of the thermometer T2 detects the dew point detected by the dew point thermometer R1. For example, when the temperature reaches an upper limit temperature that is 5 degrees (second predetermined temperature) higher than the temperature, the operation determination processing unit 104 is notified of this fact.

Next, the operation determination unit 104 notifies to confirm the control status of the evaporation temperature of the localized cooling device 6 to a local cooling device controller 10 1. The localized cooling device controller 10 1 requests a notification of control state of the evaporating temperature from the control unit 10 of the local cooling device 6. Then the control unit 10 of the local cooling unit 6 notifies a control state of the evaporating temperature to the localized cooling device control unit 101 of the controller 11. The localized cooling device controller 10 1 notifies the information notified from the control unit 10 to the operation determining process unit 104.

  Next, the operation determination processing unit 104 determines that the temperature of the thermometer T2 is equal to or higher than the upper limit temperature that is 5 degrees higher than the dew point temperature detected by the dew point thermometer R1, and the control state of the evaporation temperature of the local cooling device 6 is the lower limit. , The base air conditioner control unit 102 is instructed to reduce the dehumidifying capacity of the base air conditioner 3. Then, the base air conditioner control unit 102 gives an instruction to reduce the dehumidifying capacity of the base air conditioner 3. Then, the dew point temperature detected by the dew point thermometer R1 increases, and the temperature of the surface of the heat exchanger indicated by the thermometer T2 becomes equal to or lower than the upper limit temperature. Thereby, the excessive dehumidification of the communication equipment room using the base air conditioner 3 can be prevented.

It should be noted that the operation determination processing unit 104 determines that the evaporation temperature control state of the local cooling device 6 is higher than the upper limit temperature that is 5 degrees higher than the dew point temperature detected by the dew point thermometer R1. When the lower limit is not indicated, the local cooling device control unit 101 is instructed to reduce the control state of the evaporation temperature, and the local cooling device control unit 101 is instructed to reduce the control state of the evaporation temperature of the local cooling device 6. To.
In this embodiment, the dew point temperature of the air inlet of the cooling unit 7 is detected using the dew point thermometer R1, but the air temperature is measured using a thermometer and a hygrometer instead of the dew point thermometer R1. The temperature and humidity of the air at the suction port may be detected, and based on the temperature and humidity, for example, the local cooling device control unit 101 of the controller 11 may calculate the dew point temperature by a known calculation formula. .

(C) Control at the time of failure of the local cooling device Next, control of the controller when the local cooling device 6 fails will be described.
First, the local cooling device control unit 101 of the controller 11 receives a failure notification from the control unit 10 when the local cooling device 6 has failed. Here, for example, when the liquid refrigerant is not delivered even if the controller 8 instructs the condenser 8 to send the liquid refrigerant to the refrigerant pump 9, the controller 10 detects the failure and notifies the controller 11 of the failure. .
And the local cooling device control part 101 always compares the temperature of each thermometer T1 installed near the cold air outlet of each cooling unit 7 with the temperature memorize | stored in the temperature memory | storage part 103. FIG. Next, the local cooling device control unit 101 sets the temperature of one thermometer T1 among the thermometers T1 installed in each rack 1 of the communication equipment room to be higher than the reference temperature stored in the temperature storage unit 103. When it becomes higher, it notifies the action determination processing unit 104 to that effect. Next, when the temperature of the thermometer T1 becomes higher than the reference temperature stored in the temperature storage unit 103, the operation determination processing unit 104 receives a notification that the local cooling device 6 has already failed. Therefore, the base air conditioner control unit 102 is instructed to increase the cooling capacity by lowering the temperature of the cool air sent from the base air conditioner 3 or increasing the air volume of the cool air. Then, the base air conditioner control unit 102 instructs the base air conditioner 3 to increase the cooling capacity by lowering the temperature of the cool air or increasing the air volume of the cool air. In this way, even when the local cooling device 6 fails, the controller 11 instructs the base air conditioner 3 to control so that none of the thermometers T1 in each rack 1 shows a set temperature or higher. Reduce the temperature of the communication equipment room.

The controller localized cooling device control unit 101 of the 11, the temperature of the thermometer T1 monitors whether Luke not been lowered below a predetermined temperature. At this time, if the temperature indicated by all the thermometers T1 in the communication equipment room is lower than the reference temperature stored in the temperature storage unit 103 by the local cooling device control unit 101, the local cooling device control unit 101 indicates that effect. Is notified to the operation determination processing unit 104. Next, when the temperature of the thermometer T1 becomes 2 degrees lower than the set temperature stored in the temperature storage unit 103, the operation determination processing unit 104 notifies that the local cooling device 6 has already failed. Therefore, the base air conditioner control unit 102 is notified to perform either an instruction to increase the temperature of the cool air sent out by the base air conditioner 3 or an instruction to decrease the air volume of the cool air. Then, the base air conditioner control unit 102 instructs the base air conditioner 3 to perform either an instruction to raise the temperature of the cold air or an instruction to lower the air volume of the cold air. In this way, excessive cooling of the communication equipment room by the base air conditioner 3 is prevented.

  Even when the local cooling device 6 is out of order, the local cooling device control unit 101 of the controller 11 causes the dew point temperature and thermometer detected by the dew point thermometer R1 installed inside the cooling unit 7 of each rack 1. The temperature detected by T2 is constantly monitored. Then, when the temperature detected by the thermometer T2 is equal to or lower than the dew point temperature detected by the dew point thermometer R1, the local cooling device control unit 101 of the controller 11 performs an operation determination process. Notification to the unit 104. Next, the operation determination processing unit 104 notifies the base air conditioner control unit 102 to increase the dehumidifying capacity by the base air conditioner 3. Then, the base air conditioner control unit 102 instructs the base air conditioner 3 to increase the dehumidifying capacity. Thus, even when the local cooling device 6 is out of order, the base air conditioner 3 performs the dehumidifying operation to dehumidify the air in the communication device room. Then, the dew point temperature detected by the dew point thermometer R1 decreases and the temperature detected by the thermometer T2 becomes higher than the dew condensation prevention temperature, so that dew condensation inside the evaporator can be prevented in advance.

  In addition, when the local cooling device 6 is out of order, the local cooling device control unit 101 of the controller 11 constantly monitors the dew point temperature detected by the dew point thermometer R1 and the temperature detected by the thermometer T2, and the thermometer T2 Is higher than the upper limit temperature that is 5 degrees higher than the dew point temperature detected by the dew point thermometer R1, the operation determination processing unit 104 is notified of this. Then, the operation determination processing unit 104 instructs the base air conditioner control unit 102 to reduce the dehumidifying capacity of the base air conditioner 3. Then, the base air conditioner control unit 102 gives an instruction to reduce the dehumidifying capacity of the base air conditioner 3. Then, the dew point temperature detected by the dew point thermometer R1 increases, and the temperature of the surface of the heat exchanger indicated by the thermometer T2 becomes equal to or lower than the upper limit temperature. Thereby, when the local cooling device 6 is out of order, excessive dehumidification of the communication equipment room by the base air conditioner 3 can be prevented.

FIG. 4 is a diagram showing a configuration as another reference example of the local cooling device 6.
As shown in this figure, the local cooling device 6 is not limited to the above-described configuration, and the liquid refrigerant that has been subjected to pressure adjustment by adjusting the pressure of the condenser provided outside and the liquid refrigerant output from the condenser is shown. It is also possible to have an expansion valve that sends the gas to the evaporator of the cooling unit 7 and a compressor that compresses the gas obtained by evaporating the liquid refrigerant by the evaporator before the condenser.

  Here, the above-mentioned controller 11 and the control part 10 have a computer system inside. The process described above is stored in a computer-readable recording medium in the form of a program, and the above process is performed by the computer reading and executing this program. Here, the computer-readable recording medium means a magnetic disk, a magneto-optical disk, a CD-ROM, a DVD-ROM, a semiconductor memory, or the like. Alternatively, the computer program may be distributed to the computer via a communication line, and the computer that has received the distribution may execute the program.

It is a schematic structure figure showing the composition of the air-conditioning system by one embodiment of the present invention. It is a figure which shows the structural example of the cooling unit by this embodiment. It is a figure which shows the functional block of the controller by this embodiment. It is a figure which shows the structure used as the other reference example of the local cooling device by this embodiment.

Explanation of symbols

1 rack 1, 2 IP device, 3 base air conditioner, 6 local cooling device, 7 cooling unit, 8 condenser, 9 refrigerant pump, 10 control unit, 11 controller

Claims (3)

An indoor air conditioner for air-conditioning a room in which one or more equipment storage racks are installed;
A cooling unit comprising an evaporator and a blower and disposed in the rack; a condenser provided outdoors or indoors; and a pump for sending refrigerant output from the condenser to the evaporator, A local cooling device in which the condenser, the pump, and the evaporator of the cooling unit are sequentially connected by piping, and the inside of the rack is cooled by cold air from the blower;
Dew point temperature detecting means for detecting the dew point temperature of the air sucked from the air suction port of the local cooling device;
Refrigerant evaporating temperature detecting means for detecting the evaporating temperature of the refrigerant in the evaporator of the local cooling device;
A controller for instructing control in which the local cooling device and the dehumidifying capacity of the indoor air conditioner are linked based on the evaporation temperature detected by the refrigerant evaporation temperature detection means and the dew point temperature detected by the dew point temperature detection means; With
In the at least one local cooling device, the controller has a temperature equal to or lower than a temperature at which the evaporation temperature detected by the refrigerant evaporation temperature detection unit is higher than the dew point temperature detected by the dew point temperature detection unit by a first predetermined temperature. And an instruction to increase the dehumidifying capacity of the indoor air conditioner is provided when the control state of the evaporation temperature of the local cooling device indicates an upper limit . The controller is configured such that the evaporation temperature detected by the refrigerant evaporation temperature detection means is higher than the dew point temperature in the local cooling devices respectively provided in the plurality of device storage racks, than the dew point temperature. When the temperature is higher than the second predetermined temperature exceeding the above, and when the control state of the evaporation temperature of the local cooling device indicates a lower limit, an instruction to reduce the dehumidifying capacity of the indoor air conditioner is issued. The air conditioning system according to claim 1, wherein the air conditioning system is performed. A failure detection means for detecting a failure state of the local cooling device;
Said controller, said based on the evaporation temperature detected by the detection to the dew point temperature and the refrigerant evaporation temperature detection means of the dew-point temperature detecting means and a fault condition for detection of the failure detection unit, the dehumidification capacity of the indoor air conditioner Control is instruct | indicated. The air conditioning system of Claim 1 or Claim 2 characterized by the above-mentioned.

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