JP5491923B2 - Electronic equipment cooling system - Google Patents

Description

  The present invention relates to a cooling system for electronic equipment, and more particularly to a cooling system for electronic equipment that locally cools electronic equipment such as computers and servers arranged in a server room with a cooling system including an evaporator and a condenser. About.

  A large number of electronic devices such as computers and servers are gathered in the server room. Electronic devices are generally installed in a rack mount system, that is, a system in which racks (casings) for storing electronic devices divided into functional units are stacked in a cabinet, and a large number of cabinets are arranged on the floor of a server room.

  These electronic devices require a certain temperature environment in order to operate normally, and may cause troubles such as system stoppage when the temperature becomes high. For this reason, the server room is managed by the air conditioner in the fixed temperature environment. However, in recent years, with the rapid increase in the processing speed and processing capacity of electronic devices, the amount of heat generated from electronic devices is steadily increasing, and the running cost of air conditioners has also increased significantly.

  Against this background, various techniques for efficiently cooling electronic devices have been proposed. For example, the air conditioning system described in Patent Document 1 is a refrigerant natural circulation type air conditioning system that naturally circulates refrigerant without power, and an evaporator and a condenser at a higher position than the evaporator are connected with gas. It is comprised by connecting with piping and liquid piping. The refrigerant gas evaporated by the evaporator is sent to the condenser via the gas pipe, and the refrigerant gas liquefied by the condenser is sent to the evaporator via the liquid pipe, so that the refrigerant is naturally circulated. The cooling action can be obtained with an evaporator. It is expected that the running cost described above can be reduced by applying such a refrigerant natural circulation type air conditioning system to local cooling of electronic equipment. For example, an evaporator is placed near the exhaust outlet of an electronic device, and a cooling tower is installed on the roof of the building as a condenser, and the cooling tower uses this outside air to cool the refrigerant, greatly increasing running costs. Can be reduced.

  However, in the case of a cooling system for electronic devices, the stability of the cooling system is required in addition to the need to reduce running costs by saving energy, and various methods have been proposed. For example, high stability can be ensured by using a cooling system based on natural refrigerant circulation and a refrigeration cycle operating system based on a compressor and performing control that can be switched. In the air conditioning system described in Patent Document 2, the outside air temperature and the room temperature, the load on the electronic device, and the cooling capacity are measured. In this case, the cooling system is operated based on natural refrigerant circulation, and when the cooling capacity is insufficient with respect to the load of the electronic device, the system is switched to one that satisfies the cooling capacity. High stability is ensured.

Japanese Patent Laid-Open No. 1-252834 JP-A-11-287524

  However, in the operation of switching between the cooling system by the refrigerant natural circulation cycle and the refrigeration cycle operation system by the compressor as described above, when the outside air temperature is drastically reduced, the cooling system by the refrigerant natural circulation cycle having no drive source Thus, refrigerant storage or the like in the condenser may occur, and the capacity of the evaporator may be reduced. For example, when the outside air temperature decreases, the condensing pressure inside the refrigerant cooling tower decreases, and the refrigerant liquid that flows down is pulled. Therefore, the refrigerant liquid does not flow well, and the refrigerant liquid is stored inside the refrigerant cooling tower. In this case, since the amount of liquid flowing down from the refrigerant cooling tower is equal to or less than the amount of refrigerant necessary for the refrigerant natural circulation cycle operation, the cooling capacity of the evaporator is reduced. Therefore, the refrigeration cycle operation by the compressor may be performed even though the outside air temperature is lowered.

  Therefore, in order to reduce the running cost, the natural circulation cycle is not stopped as much as possible to shorten the forced circulation time, and even in the forced circulation, the refrigeration cycle operation is not performed by the compressor. It is important not to consume useless energy by performing operation by cycle and performing stable operation.

  The present invention has been made in view of such circumstances, making it possible to shorten the time for forced circulation by utilizing natural circulation as much as possible, and switching from natural circulation to forced circulation even in an unsteady state. An object of the present invention is to provide an electronic device cooling system that is energy-saving and highly safe in operation even when both natural circulation and forced circulation are provided, since smooth operation can be realized.

To achieve the above object, a plurality of evaporators for cooling the hot exhaust with vaporizes the refrigerant by heat exchange with the hot exhaust from the electronic device, than a plurality of the evaporator is installed in a high place, a plurality A condenser for liquefying the vaporized refrigerant in the evaporator, a gas pipe for sending the refrigerant gas vaporized in the evaporator to the condenser, between the evaporator and the condenser, and the condenser A cooling system for an electronic device comprising: a liquid pipe that sends the refrigerant liquid liquefied to the evaporator; and a natural circulation mechanism that naturally circulates the refrigerant, and is in the middle of the liquid pipe or the gas pipe A bypass pipe provided as a bypass flow path; a forced circulation means provided in the bypass pipe for forcibly circulating a refrigerant amount required by the natural circulation mechanism; and a liquid distribution bypassed by the bypass pipe. A backflow prevention mechanism provided in a bypass-corresponding portion, a refrigerant gas pressure sensor that measures a refrigerant gas pressure flowing into the condenser, a refrigerant liquid pressure sensor that measures a refrigerant liquid pressure flowing out of the condenser, and And a controller that drives the forced circulation means when the measured value A of the refrigerant gas pressure sensor and the measured value B of the refrigerant liquid pressure sensor satisfy B> A. Provide a system.

  In the present invention, forced circulation means for forced circulation is provided in the bypass line of the liquid piping or gas piping so that it can be driven only when natural circulation is no longer performed.

  Specifically, a refrigerant gas pressure sensor for measuring the refrigerant gas pressure flowing into the condenser and a refrigerant liquid pressure sensor for measuring the refrigerant liquid pressure flowing out of the condenser are provided, and the refrigerant gas pressure sensor is measured. When the value A and the measured value B of the refrigerant liquid pressure sensor satisfy B> A, the controller drives the forced circulation means.

  As a result, it is possible to shorten the time for forced circulation by utilizing natural circulation as much as possible, and it is possible to smoothly switch from natural circulation to forced circulation even during non-steady times, thereby realizing stable operation. Even if both natural circulation and forced circulation are provided, it is possible to provide a cooling system for electronic equipment that is energy-saving and has high driving safety.

Furthermore, in order to achieve the above object, an evaporator that evaporates the refrigerant by heat exchange with the high-temperature exhaust from the electronic device and cools the high-temperature exhaust, and is installed at a higher position than the evaporator and is vaporized. A condenser for liquefying the refrigerant, a gas pipe between the evaporator and the condenser for sending the refrigerant gas vaporized by the evaporator to the condenser, and a refrigerant liquid liquefied by the condenser for the evaporation A cooling system for an electronic device comprising: a liquid pipe to be sent to a container; and a natural circulation mechanism that naturally circulates the refrigerant, and is a bypass provided as a bypass in the middle of the liquid pipe or the gas pipe A pipe, a forced circulation means for forcibly circulating a refrigerant amount necessary for the natural circulation mechanism, and a bypass corresponding portion of a liquid pipe bypassed by the bypass pipe. A reverse flow prevention mechanism, a tank provided in communication with the liquid pipe in the middle of the liquid pipe, storing the refrigerant liquid and having a head space, and a liquid level sensor for measuring the position of the refrigerant liquid level; The exhaust air is cooled with respect to the exhaust temperature of the electronic device measured by the temperature sensor from the temperature sensor that measures the exhaust air temperature of the electronic device, and the measured values of the liquid level sensor and the temperature sensor. And a controller for driving the forced circulation means when the refrigerant liquid level measured by the liquid level sensor is lower than the calculated value. A cooling system for electronic equipment is provided.

  In the present invention, a tank that is provided in the middle of the liquid pipe and communicates with the liquid pipe, stores a refrigerant liquid and has a head space, a liquid level sensor that measures the position of the refrigerant liquid level, and exhaust air of an electronic device. A temperature sensor for measuring the temperature, and from the measured values of the liquid level sensor and the temperature sensor, the refrigerant liquid level height required for cooling the exhaust air with respect to the exhaust temperature of the electronic device measured by the temperature sensor When the refrigerant liquid level measured by the liquid level sensor is lower than the calculated value, the forced circulation means is driven by the controller.

  As a result, it is possible to shorten the time for forced circulation by utilizing natural circulation as much as possible, and it is possible to smoothly switch from natural circulation to forced circulation even during non-steady times, thereby realizing stable operation. Even if both natural circulation and forced circulation are provided, it is possible to provide a cooling system for electronic equipment that is energy-saving and has high driving safety.

  Furthermore, in order to achieve the above object, an evaporator that evaporates the refrigerant by heat exchange with the high-temperature exhaust from the electronic device and cools the high-temperature exhaust, and is installed at a higher position than the evaporator and is vaporized. A condenser for liquefying the refrigerant, a gas pipe between the evaporator and the condenser for sending the refrigerant gas vaporized by the evaporator to the condenser, and a refrigerant liquid liquefied by the condenser for the evaporation A cooling system for an electronic device comprising: a liquid pipe to be sent to a container; and a natural circulation mechanism that naturally circulates the refrigerant, and is a bypass provided as a bypass in the middle of the liquid pipe or the gas pipe A pipe, a forced circulation means for forcibly circulating a refrigerant amount necessary for the natural circulation mechanism, and a bypass corresponding portion of a liquid pipe bypassed by the bypass pipe. A backflow prevention mechanism, a refrigerant pressure sensor that measures the refrigerant liquid pressure of the evaporator, a condenser pressure sensor that measures the pressure of the condenser, and a temperature sensor that measures the exhaust air temperature of the electronic device And the required refrigerant liquid pressure corresponding to the exhaust temperature measured by the temperature sensor is calculated, and obtained from the difference between the refrigerant liquid pressure measured by the refrigerant liquid pressure sensor and the pressure measured by the condenser pressure sensor. And a controller for driving the forced circulation means when the height is lower than the liquid column height.

  In the present invention, a pressure sensor for measuring the refrigerant liquid pressure of the evaporator and a temperature sensor for measuring the exhaust air temperature of the electronic device are provided, and the required liquid column height corresponding to the exhaust temperature measured by the temperature sensor is calculated. When the liquid column height calculated from the measurement value measured by the pressure sensor is lower than the necessary liquid column height, the forced circulation means is driven by the controller.

  As a result, it is possible to shorten the time for forced circulation by utilizing natural circulation as much as possible, and it is possible to smoothly switch from natural circulation to forced circulation even during non-steady times, thereby realizing stable operation. Even if both natural circulation and forced circulation are provided, it is possible to provide a cooling system for electronic equipment that is energy-saving and has high driving safety.

  In the above, the condenser is preferably a refrigerant cooling tower or a heat exchanger.

  Furthermore, in order to achieve the above object, an evaporator that evaporates the refrigerant by heat exchange with the high-temperature exhaust from the electronic device and cools the high-temperature exhaust, and is installed at a higher position than the evaporator and is vaporized. A refrigerant cooling tower for liquefying the refrigerant, a gas pipe for sending the refrigerant gas vaporized by the evaporator to the refrigerant cooling tower between the evaporator and the refrigerant cooling tower, and a refrigerant liquefied by the refrigerant cooling tower A cooling system for an electronic device comprising: a liquid pipe that sends liquid to the evaporator; and a natural circulation mechanism that naturally circulates the refrigerant, as a bypass channel in the middle of the liquid pipe or the gas pipe A bypass pipe provided, a forced circulation means provided in the bypass pipe for forcibly circulating a refrigerant amount required by the natural circulation mechanism, and a liquid pipe bypassed by the bypass pipe. A backflow prevention mechanism provided in the path-corresponding portion, a temperature sensor that measures the outside air temperature, a humidity sensor that measures the outside air humidity, and the wet bulb temperature of the outside air from the measured temperature of the temperature sensor and the measured humidity of the humidity sensor. And a controller that drives the forced circulation means when the outdoor wet bulb temperature is lower than a set value. An electronic device cooling system is provided.

  In the present invention, a temperature sensor for measuring the outside air temperature and a humidity sensor for measuring the outside air humidity are provided, and the wet bulb temperature of the outside air is calculated from the measured temperature of the temperature sensor and the measured humidity of the humidity sensor. When the temperature becomes lower than the outside air utilization planned temperature, the forced circulation means is driven.

  As a result, it is possible to shorten the time for forced circulation by utilizing natural circulation as much as possible, and it is possible to smoothly switch from natural circulation to forced circulation even during non-steady times, thereby realizing stable operation. Even if both natural circulation and forced circulation are provided, it is possible to provide a cooling system for electronic equipment that is energy-saving and has high driving safety.

  In the present invention, the forced circulation means is a pump when the bypass pipe is provided in the liquid pipe, and a compressor when the bypass pipe is provided in the gas pipe.

  Furthermore, in order to achieve the object, it is preferable that an outlet temperature sensor for measuring the outlet air temperature of the evaporator is provided, and the pump is driven only when the measured value of the outlet temperature sensor is equal to or higher than the evaporator outlet set value.

  That is, an outlet temperature sensor for measuring the outlet air temperature for measuring the outlet air temperature of the evaporator is installed, and forced circulation means is used only when the outlet air temperature of the evaporator measured by the temperature sensor is equal to or higher than the evaporator outlet temperature set value. Drive.

  As a result, the forced circulation means can be driven only when the refrigerant liquid is stored in the cooling tower and when the outlet air temperature of the evaporator is not less than the set value and the cooling performance is not exhibited. Can be prevented, and a more energy-saving cooling system can be provided.

  As described above, according to the electronic device cooling system of the present invention, it is possible to shorten the time for forced circulation by utilizing natural circulation as much as possible, and to switch from natural circulation to forced circulation even in an unsteady state. Therefore, it is possible to provide a cooling system for an electronic device that saves energy and has high driving safety even if both natural circulation and forced circulation are provided.

The conceptual diagram explaining the whole structure of 1st Embodiment of the cooling system of the electronic device of this invention The conceptual diagram explaining the whole structure of 2nd Embodiment of the cooling system of the electronic device of this invention The conceptual diagram explaining the whole structure of 3rd Embodiment of the cooling system of the electronic device of this invention The conceptual diagram explaining the whole structure of 4th Embodiment of the cooling system of the electronic device of this invention The conceptual diagram explaining the whole structure of the 1st modification of 1st Embodiment of the cooling system of the electronic device of this invention The conceptual diagram explaining the whole structure of the 2nd modification of 1st Embodiment of the cooling system of the electronic device of this invention

  Hereinafter, preferred embodiments of a cooling system for electronic equipment according to the present invention will be described in detail with reference to the accompanying drawings.

(First embodiment)
FIG. 1 is a conceptual diagram showing an overall configuration of a cooling system 10 for an electronic device according to a first embodiment.

  A cooling system 10 shown in the figure is a system that locally cools the vicinity of server racks 14 and 14 provided in a server room 12. In FIG. 1, two server racks 14 and 14 are illustrated in the server room 12, but actually, a large number of server racks 14 are arranged on the floor surface 13. Further, the servers 14A, 14B, 14C,... Are usually installed in the server room 12 by being stacked and stored in the server rack 14. In the following description, X is a member related to the cooling system shown on the left side of the figure, and Y is a member related to the cooling system shown on the right side.

  Each of the servers 14A, 14B, 14C,... Has an air suction port and an exhaust port, and also has a fan 16 inside. By driving the fan 16, air is sucked from the suction port, and the server is discharged from the exhaust port. Exhaust air 21 with exhaust heat of 14A, 14B, 14C,... Is exhausted. Thereby, server 14A, 14B, 14C, ... can be cooled. On the other hand, if the exhaust air 21 is exhausted to the server room 12 as it is, the room temperature of the server room 12 rises, and the air temperature sucked into the servers 14A, 14B, 14C,. Therefore, it is necessary to exhaust the exhausted air to the server room 12 after cooling it with the evaporators 20X and 20Y.

  The cooling system 10 is based on a natural circulation mechanism of refrigerant mainly composed of evaporators 20X and 20Y, a condenser 22, a liquid pipe 24, and a gas pipe 26, and a forced circulation mechanism for forced circulation of the refrigerant is added thereto. Is.

  The evaporators 20X and 20Y are respectively provided in the vicinity of the server exhaust port, and coils (not shown) are provided inside the evaporators 20X and 20Y. Exhaust air 21 discharged from the server exhaust port flows outside the coil, and refrigerant liquid flows inside the coil to exchange heat. As a result, the refrigerant liquid in the coil takes the heat of vaporization from the exhaust heat air and evaporates, so that the exhaust air exhausted to the server room 12 is cooled. Accordingly, the temperature environment of the server room 12 can be set to a temperature environment necessary for the servers 14A, 14B, 14C,.

  The condenser 22 is a device that cools and condenses the refrigerant evaporated in the evaporators 20X and 20Y, and is installed at a position higher than the evaporators 20X and 20Y, for example, on the building roof of the server room 12.

  Various modes can be adopted as the condenser 22. In FIG. 1, a refrigerant cooling tower is shown, and the condenser 22 is configured to condense and liquefy the refrigerant gas by exchanging heat between the refrigerant and the outside air.

  The evaporators 20X and 20Y and the condenser 22 are connected by a liquid pipe 24 (including branch pipes 24X and 24Y) and a gas pipe 26 (including branch pipes 26X and 26Y). The upper end of the gas pipe 26 is connected to one end of a coil 22A in the condenser 22, and the lower end of the gas pipe 26 is branched into branch pipes 26X and 26Y. The branch pipes 26X and 26Y are connected to the evaporators 20X and 20Y. It is connected to one end of a coil (not shown). On the other hand, the upper end of the liquid pipe 24 is connected to the other end of the coil 22A in the condenser 22, and the lower end of the liquid pipe 24 is branched into branch pipes 24X and 24Y. The branch pipes 24X and 24Y are connected to the evaporator. It is connected to the other end of 20X and 20Y coils (not shown). Therefore, the refrigerant gas vaporized by the evaporators 20X and 20Y rises up the gas pipe 26 and is naturally sent to the condenser 22. After being liquefied by the condenser 22, the liquefied refrigerant flows down the liquid pipe 24. Then, it is naturally sent to the evaporators 20X and 20Y. Thereby, natural circulation of a refrigerant is performed. As the circulating refrigerant, chlorofluorocarbon or HFC (hydrofluorocarbon) as an alternative chlorofluorocarbon can be used. In addition, water can be used if it is used at a pressure lower than atmospheric pressure. Here, it is preferable that the liquid pipe 24 and the gas pipe 26 pass under the floor 18 below the floor surface 13 of the server room 12.

  Then, by controlling the flow rate of the naturally circulating refrigerant, the air temperature after the high-temperature air exhausted from the servers 14A, 14B, 14C,... The exhaust air temperature exhausted to the server room 12 is cooled, and the server room 12 is maintained in a temperature environment suitable for the servers 14A, 14B, 14C,.

  A configuration for forced circulation described below is added to the basic configuration for natural circulation described above. That is, a bypass pipe 28 is provided in the middle of the liquid pipe 24 as a bypass flow path, and a pump 30 for forcibly circulating the refrigerant in the bypass pipe 28 is provided. That is, the pump 30 can be driven only when the natural circulation is stopped.

  In addition, a backflow prevention mechanism 27 is provided in the bypass corresponding portion 24A of the liquid pipe 24 bypassed by the bypass pipe 28, preventing the backflow of the refrigerant liquid in the liquid pipe 24 when the pump 30 is driven, and no short circuit occurs. I am doing so.

  A refrigerant gas pressure sensor 32A that measures the refrigerant gas pressure flowing into the condenser 22 and a refrigerant liquid pressure sensor 32B that measures the refrigerant liquid pressure flowing out of the refrigerant cooling tower are provided. When the measured value A of the refrigerant gas pressure sensor and the measured value B of the refrigerant liquid pressure sensor satisfy B> A, the controller 30 drives the pump 30. If the refrigerant liquid pressure is higher than the refrigerant gas pressure, the refrigerant is forcibly circulated by the pump 30, and if low, the pump 30 is stopped.

  This makes it possible to reduce the time for forced circulation by utilizing natural circulation as much as possible, and to smoothly switch from natural circulation to forced circulation even during non-steady times, thereby realizing stable operation. Even if both natural circulation and forced circulation are provided, it is possible to provide a cooling system for electronic equipment that is energy-saving and has high driving safety.

(Second Embodiment)
FIG. 2 is a conceptual diagram illustrating the overall configuration of the cooling system 10 for an electronic device according to the second embodiment.

  In the present embodiment, in the configuration of FIG. 1, instead of the refrigerant gas pressure sensor 32A and the refrigerant liquid pressure sensor 32B, the tank 35 that stores the refrigerant liquid in the middle of the liquid pipe 24 and has a head space, and the refrigerant A liquid level sensor 36 for measuring the position of the liquid level and temperature sensors 34X and 34Y for measuring the exhaust air temperature of the electronic device (in this case, a server) are provided. Other configurations are the same as those in FIG.

  The tank 35 stores the refrigerant liquid and forms a head space above the liquid level of the refrigerant liquid. That is, the liquid pipe 24 on the condenser 22 side is connected to the head space of the tank 35, and the liquid pipe 24 on the evaporator 20 side is connected to the bottom of the tank 35. By disposing the tank 35, the refrigerant gas is separated into the head space even when refrigerant gas is mixed in the refrigerant liquid, so that the refrigerant gas does not flow into the pump 30. As a result, the pump 30 does not idle due to cavitation when the pump 30 is driven. Accordingly, it is possible to smoothly switch from the natural circulation to the forced circulation in combination with the backflow prevention of the refrigerant liquid by the backflow prevention mechanism 27, and it is possible to prevent the pump 30 from consuming unnecessary energy due to cavitation during the forced circulation.

  Further, the tank 35 is not only effective during forced circulation but also effective during natural circulation. That is, when the condensation temperature of the condenser 22 decreases, the amount of refrigerant liquid flowing from the condenser 22 may decrease. In this case, a high liquid column cannot be secured in the liquid pipe 24 and natural circulation stops. However, by storing the refrigerant liquid in the tank 35, a high liquid column can be maintained even when the condensation temperature of the condenser 22 is lowered. As a result, the chances for the natural circulation to stop are reduced, so that the time that must be switched to the forced circulation can be shortened.

  In the present embodiment, the liquid level height required for cooling the exhaust air is calculated from the measured values of the liquid level sensor 36 and the temperature sensors 34X and 34Y with respect to the exhaust temperature of the electronic device measured by the temperature sensor. When the refrigerant liquid level measured by the liquid level sensor is lower than the calculated value, the controller 30 drives the pump 30.

  This makes it possible to reduce the time for forced circulation by utilizing natural circulation as much as possible, and to smoothly switch from natural circulation to forced circulation even during non-steady times, thereby realizing stable operation. Even if both natural circulation and forced circulation are provided, it is possible to provide a cooling system for electronic equipment that is energy-saving and has high driving safety.

(Third embodiment)
FIG. 3 is a conceptual diagram illustrating an overall configuration of the cooling system 10 for an electronic device according to the third embodiment.

  In the present embodiment, in the configuration of FIG. 1, instead of the refrigerant gas pressure sensor 32A and the refrigerant liquid pressure sensor 32B, pressure sensors 32X and 32Y that measure the evaporation pressure of the evaporators 20X and 20Y, Temperature sensors 34X and 34Y for measuring the exhaust air temperature are provided. Other configurations are the same as those in FIG.

  In the present embodiment, the necessary evaporation pressure corresponding to the exhaust temperature measured by the temperature sensors 34X and 34Y is calculated, and the pump 30 is driven by the controller 17 when the evaporation pressure measured by the pressure sensor is lower than the calculated evaporation pressure. .

  As a result, it is possible to shorten the time for forced circulation by utilizing natural circulation as much as possible, and it is possible to smoothly switch from natural circulation to forced circulation even during non-steady times, thereby realizing stable operation. Even if both natural circulation and forced circulation are provided, it is possible to provide a cooling system for electronic equipment that is energy-saving and has high driving safety.

(Fourth embodiment)
FIG. 4 is a conceptual diagram illustrating the overall configuration of the cooling system 10 for an electronic device according to the fourth embodiment.

  In the present embodiment, in the configuration of FIG. 1, instead of the refrigerant gas pressure sensor 32A and the refrigerant liquid pressure sensor 32B, a temperature sensor 34 that measures the outside air temperature, and a humidity sensor 40 that measures the outside air humidity. It is provided. Other configurations are the same as those in FIG.

  In the present embodiment, in the present invention, the wet bulb temperature of the outside air is calculated from the measured temperature of the temperature sensor 34 and the measured humidity of the humidity sensor 40, and the controller 17 when the outside wet bulb temperature becomes lower than the outside air utilization planned temperature. Then, the pump 30 is driven.

  As a result, it is possible to shorten the time for forced circulation by utilizing natural circulation as much as possible, and it is possible to smoothly switch from natural circulation to forced circulation even during non-steady times, thereby realizing stable operation. Even if both natural circulation and forced circulation are provided, it is possible to provide a cooling system for electronic equipment that is energy-saving and has high driving safety.

(First modification)
In the electronic apparatus cooling system 10 according to the first to third embodiments, the condenser 22 is a refrigerant cooling tower, but various forms can be adopted as the condenser 22.

  FIG. 5 shows a configuration in which a cooling device 23 (for example, a refrigerator or a cooling tower) is separately provided in the electronic apparatus cooling system 10 of the first embodiment, and the refrigerant of the cooling device 23 is circulated in the heat exchanger. It is.

(Second modification)
In the electronic apparatus cooling system 10 according to the first to fourth embodiments, the bypass pipe 28 provided as a bypass flow path in the middle of the liquid pipe 24 and the refrigerant amount required for the natural circulation mechanism provided in the bypass pipe. Instead of the pump 30 forcibly circulating the gas and the backflow prevention mechanism 27 provided in the bypass corresponding part of the liquid pipe 24 bypassed by the bypass pipe, a bypass flow path is provided in the middle of the gas pipe 26. The bypass pipe 38, the compressor 37 that is provided in the bypass pipe and forcibly circulates the refrigerant amount necessary for the natural circulation mechanism, and the backflow prevention provided in the bypass corresponding portion of the liquid pipe 24 that is bypassed by the bypass pipe 38 It is also possible to use the mechanism 27. In this case, the controller 17 drives the compressor 37.

  FIG. 6 shows the configuration described above in the electronic apparatus cooling system 10 according to the first embodiment.

  In addition, the present invention is a cooling system for electronic devices, but as an application example, any device that generates heat can be applied.

  DESCRIPTION OF SYMBOLS 10 ... Cooling system of an electronic device, 12 ... Server room, 13 ... Floor surface, 14 ... Server rack, 14A, 14B, 14C ... Server, 16 ... Fan, 17 ... Controller, 18 ... Under floor, 20X, 20Y ... Evaporator, 21 ... Exhaust air, 22 ... Condenser (refrigerant cooling tower, heat exchanger), 23 ... Cooling device, 24 ... Liquid piping, 24X, 24Y ... Branch pipe, 26 ... Gas pipe, 26X, 26Y ... Branch pipe, 27 ... Backflow prevention mechanism (check valve), 28 ... bypass piping, 30 ... pump (forced circulation means), 32A, 32B ... pressure sensor, 32X, 32Y ... pressure sensor, 34 ... temperature sensor, 34X, 34Y ... temperature sensor, 37 ... Compressor (forced circulation means), 38 ... Bypass piping, 40 ... Humidity sensor

Claims (4)

A plurality of evaporators for vaporizing the refrigerant by heat exchange with the high-temperature exhaust from the electronic device and cooling the high-temperature exhaust;
A condenser that is installed at a higher position than the plurality of the evaporators, and that liquefies the vaporized refrigerant in the plurality of evaporators ;
Between the evaporator and the condenser, a gas pipe for sending the refrigerant gas evaporated by the evaporator to the condenser and a liquid pipe for sending the refrigerant liquid liquefied by the condenser to the evaporator are connected. A cooling system for electronic equipment comprising a natural circulation mechanism for natural circulation of the refrigerant,
A bypass pipe provided as a bypass channel in the middle of the liquid pipe or the gas pipe;
A forced circulation means provided in the bypass pipe and forcibly circulating a refrigerant amount required by the natural circulation mechanism;
A backflow prevention mechanism provided in the bypass corresponding part of the liquid pipe bypassed by the bypass pipe;
A refrigerant gas pressure sensor for measuring the refrigerant gas pressure flowing into the condenser;
A refrigerant liquid pressure sensor for measuring the refrigerant liquid pressure flowing out of the condenser;
And a controller for driving the forced circulation means when the measured value A of the refrigerant gas pressure sensor and the measured value B of the refrigerant liquid pressure sensor satisfy B> A. . The electronic apparatus cooling system according to claim 1, wherein the condenser is a refrigerant cooling tower or a heat exchanger. The forced circulation means, wherein when the bypass pipe is provided in the liquid pipe pump, the claim if the bypass pipe is provided in the gas pipe is characterized in that the compressor is one or 3. A cooling system for electronic equipment according to 2 . An outlet temperature sensor for measuring the outlet air temperature of the evaporator, claim 1-3 in which the measured value of the outlet temperature sensor and drives the pump only when the above evaporator outlet setpoint The electronic device cooling system according to 1.

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