JP2011117629A - Cooling system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cooling system which prevents decline in cooling capacity in an evaporator even in winter having low outside air temperature. <P>SOLUTION: In a cooling tower system circulating a refrigerant between the evaporator and a cooling tower 22, the cooling tower 22 includes: a cooling tower body 30 having an intake port 30A of outside air and exhaust port 30B formed therein; a heat exchange coil 28 provided within the cooling tower body 30 and having an inlet/outlet connected to the evaporator; a sprinkler 34 sprinkling water on the heat exchange coil 28; an air blower 36 sending the outside air taken in from the intake port 30A to the heat exchange coil 28 and discharging the outside air from the exhaust port 30B; a circulation duct 38 returning part of discharged outside air discharged from the exhaust port 30B to a portion in the vicinity of the intake port 30A and mixing the discharged outside air with taken-in outside air from the intake prot 30A; a damper device 40 controlling the air quantity of the discharged outside air made to flow in the circulation duct 38; and a control mechanism 42 controlling the damper device 40 so that condensation pressure of refrigerant gas condensed by the heat exchange coil 28 becomes a predetermined pressure. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a cooling system, and in particular, a cooling system for locally cooling electronic equipment such as a computer and a server disposed in a server room by circulating a refrigerant between an evaporator and a condenser. Then, it is related with the technical improvement of the cooling system in the case of using the cooling tower using outside air and watering as a condenser.

  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 cooling system of Patent Document 1 is configured by connecting an evaporator and a condenser at a higher position than the evaporator with a gas pipe and a liquid pipe. The refrigerant gas vaporized by the evaporator is sent to the condenser via the gas pipe, and the refrigerant liquid liquefied by the condenser is sent to the evaporator via the liquid pipe, so that the refrigerant is naturally circulated and evaporated. Cooling action can be obtained with a vessel. It is expected that the running cost described above can be reduced by applying such a refrigerant natural circulation type cooling system to the local cooling of the server. For example, by placing the evaporator near the exhaust port of the server and installing a cooling tower on the roof of the building as a condenser and cooling the refrigerant using outside air in this cooling tower, the running cost is greatly increased It becomes possible to reduce.

  Moreover, as a condenser which condenses a refrigerant, there is a method using a cooling tower type one using outside air or water spray, as seen in Patent Document 2. Patent Document 2 describes an ammonia cooling unit that uses an ammonia refrigerant to form a refrigeration cycle such as a compressor, an evaporator (cooling tower type) that is a condenser, an expansion valve, and an evaporator. Then, the evaporator uses the outside air and water spray to condense the refrigerant gas into a refrigerant liquid.

JP 2007-127315 A Japanese Patent No. 3990161

  However, in the evaporator of Patent Document 2, when the outside air temperature is lowered, the condensation pressure for condensing the refrigerant gas by the heat exchange coil is lowered. For this reason, since the refrigerant liquid stays in the heat exchange coil inside the evaporator and the amount of refrigerant supplied to the evaporator is reduced, there is a problem that the cooling capacity in the evaporator is lowered. In particular, when the refrigerant is naturally circulated between the evaporator and the condenser, the liquid liquid that becomes the driving force for natural circulation in the liquid pipe is lowered by the refrigerant liquid staying in the heat exchange coil of the evaporator. Therefore, the refrigerant liquid is not supplied to the evaporator, and the cooling capacity in the evaporator is reduced.

  Therefore, in winter when the outside air temperature decreases, it is necessary to control the amount of heat in the evaporator, and a method of reducing the amount of outside air taken in by the blower can be considered. However, when the outside air temperature is lowered, the outside air temperature in contact with the heat exchange coil remains low even if the air volume is reduced, so that the condensation pressure is lowered. Although it is conceivable to reduce the amount of water sprayed from the water sprayer to the heat exchange coil, there is almost no effect on the heat amount control when the outside air temperature is low.

  The present invention has been made in view of such circumstances, and when a cooling tower is used as a condenser and the refrigerant is circulated between the condenser and the evaporator, especially when it is naturally circulated, it is a winter season when the outside air temperature is low. An object of the present invention is to provide a cooling system capable of preventing a decrease in the cooling capacity in the evaporator because the condensing pressure can be prevented from being lowered more than necessary by a simple structural improvement of the cooling tower.

  In order to achieve the above object, the invention according to claim 1 circulates a refrigerant between an evaporator for vaporizing the refrigerant and a condenser for liquefying the refrigerant vaporized by the evaporator, and the condenser. In the cooling system using the cooling tower, the cooling tower includes a cooling tower main body in which an outside air intake port and an exhaust port are formed, and a refrigerant that is provided in the cooling tower main body and the inlet returns from the evaporator. A heat exchange coil connected to a gas pipe through which a gas flows and an outlet connected to a liquid pipe through which a refrigerant liquid supplied to the evaporator flows, a water sprayer for spraying water into the heat exchange coil, and taking in outside air from the intake port The blower that blows air to the heat exchange coil and exhausts from the exhaust port, and returns a part of the exhaust outside air exhausted from the exhaust port to the vicinity of the intake port and mixes it with the intake external air from the intake port With circulation duct An air volume adjusting means for adjusting the air volume of the exhaust outside air flowing through the circulation duct, and a control mechanism for controlling the air volume adjusting means so that the condensation pressure of the refrigerant gas condensed in the heat exchange coil becomes a predetermined pressure. Provided is a cooling system characterized by comprising.

  According to claim 1 of the present invention, a conventional cooling tower using outside air and water spray is provided with the above-described circulation duct, air volume adjusting means, and control mechanism. As a result, the outside air taken in from the intake port of the cooling tower body evaporates the water sprayed on the heat exchange coil and cools the refrigerant flowing in the heat exchange coil, while the temperature rises itself from the exhaust port. Exhausted. By circulating a part of the exhaust outside air whose temperature has risen to the vicinity of the inlet of the cooling tower main body through a circulation duct and mixing it with the outside air, the temperature of the outside air blown to the heat exchange coil is taken in from the inlet. It can be higher than the outside air temperature. It can be controlled by adjusting the circulation amount of the exhaust outside air flowing through the circulation duct by the air volume adjusting means.

  Then, when the condensation pressure for obtaining the liquid column in the liquid piping necessary for the stable circulation of the refrigerant in the cooling system is a predetermined pressure, the temperature of the mixed outside air is controlled by the control mechanism so that the condensation pressure becomes the predetermined pressure. To do. Thereby, since it is possible to prevent the condensation pressure from being lowered more than necessary by a simple structural improvement of the cooling tower in the winter when the outside air temperature is low, it is possible to prevent the cooling capacity from being lowered in the evaporator.

  A second aspect of the present invention is the first aspect of the present invention, wherein the control mechanism includes a refrigerant pressure sensor that measures the pressure of the refrigerant gas at the inlet of the heat exchange coil, and the air volume adjustment so that the measured pressure of the refrigerant pressure sensor becomes the predetermined pressure. And a controller for controlling the means.

  The second aspect of the present invention shows one aspect of a control mechanism for controlling the condensation pressure to a predetermined pressure, and the refrigerant gas at the inlet of the heat exchange coil is directly measured by the refrigerant pressure sensor, and the controller measures the predetermined pressure. The air volume adjusting means is controlled so that

  Thereby, the condensation pressure of the refrigerant gas by the heat exchange coil can be controlled to a predetermined pressure.

  A third aspect of the present invention is the first aspect of the present invention, wherein the control mechanism includes a blower outside air temperature sensor that measures the temperature of the blown outside air that is blown to the heat exchange coil by the blower, and a condensing pressure of refrigerant gas that is condensed by the heat exchange coil. And a controller for controlling the air volume adjusting means so that the measured temperature of the blown outside air temperature sensor becomes the set temperature. Features.

  The third aspect of the present invention shows another aspect of the control mechanism for controlling the condensation pressure to a predetermined pressure. The temperature of the blown outside air is measured by the blown outside air temperature sensor, and the refrigerant gas pressure at the inlet of the heat exchange coil is measured. The controller in which the set temperature of the blown outside air for setting the pressure to the predetermined pressure is input in advance controls the air volume adjusting means so that the measured temperature of the blown outside air temperature sensor becomes the set temperature.

  Thereby, the condensation pressure of the refrigerant gas by the heat exchange coil can be controlled to a predetermined pressure.

  A fourth aspect of the present invention provides the method according to the first aspect, wherein the control mechanism sets a refrigerant liquid temperature sensor for measuring a temperature of the refrigerant liquid at the outlet of the heat exchange coil and a pressure of the refrigerant gas at the inlet of the heat exchange coil to a predetermined pressure. And a controller that controls the air volume adjusting means so that the measured temperature of the refrigerant liquid temperature sensor becomes the set temperature.

  Claim 4 shows still another aspect of the control mechanism for controlling the condensing pressure to a predetermined pressure, and the refrigerant liquid for setting the refrigerant liquid at the outlet of the heat exchange coil to a predetermined pressure by the refrigerant liquid temperature sensor. The controller to which the preset temperature is input in advance controls the air volume adjusting means so that the measured temperature of the refrigerant liquid temperature sensor becomes the preset temperature.

  Thereby, the condensation pressure of the refrigerant gas by the heat exchange coil can be controlled to a predetermined pressure.

  A fifth aspect of the present invention is the system according to any one of the first to fourth aspects, wherein the cooling system is a system for cooling an electronic device disposed in a server room, and the evaporator is exhausted hot air from the electronic device. The refrigerant is vaporized by heat exchange with the air, and the exhaust heat air exhausted into the server room is cooled.

  The fifth aspect of the present invention is because it is particularly effective to apply the cooling system of the present invention to a system for cooling electronic equipment disposed in a server room with an evaporator.

  A sixth aspect of the present invention is characterized in that, in any one of the first to fifth aspects, the cooling tower is arranged at a higher position than the evaporator and the refrigerant is naturally circulated.

  This is because the cooling system of the present invention is particularly effective when applied to a type in which the refrigerant is naturally circulated between the evaporator and the cooling tower.

  As described above, according to the cooling system of the present invention, when the cooling tower is a condenser and the refrigerant is circulated between the condenser and the evaporator, particularly when it is naturally circulated, it is a winter tower where the outside air temperature is low and the cooling tower With this simple structural improvement, the condensation pressure can be prevented from being lowered more than necessary. Thereby, the fall of the cooling capability in an evaporator can be prevented.

The conceptual diagram explaining the whole structure of the cooling system of this invention Explanatory drawing explaining the structure of a cooling tower, and one aspect | mode of a control mechanism Explanatory drawing explaining another aspect of a control mechanism Explanatory drawing explaining another aspect of a control mechanism

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

  In the present embodiment, the cooling system of the present invention will be described below with an example in which the cooling system of the present invention is applied to a cooling system for electronic equipment, and a natural circulation cycle in which a refrigerant is naturally circulated.

  FIG. 1 is a conceptual diagram showing the overall configuration of a cooling system 10 for an electronic device.

  The cooling system 10 shown in the figure is a system that locally cools the vicinity of the server 14 provided in the server rooms 12X and 12Y on the upper and lower two floors. In the following description, X is a member related to the cooling system of the lower floor, and Y is a member related to the cooling system of the upper floor. In FIG. 1, one server 14 is illustrated in each of the server rooms 12X and 12Y, but in reality, a large number of servers 14 are arranged. Further, the servers 14 are usually installed in server rooms 12X and 12Y by being stacked and stored in a server rack (not shown).

  The server 14 includes an air suction port 14A and an exhaust port 14B, and an internal fan 14C. By driving the fan 14C, air is sucked from the suction port 14A and exhausted from the exhaust port 14B. Exhaust heat air accompanied by heat is exhausted. Thereby, the server 14 can be cooled. On the other hand, if the exhaust heat air is exhausted to the server rooms 12X and 12Y as it is, the room temperature of the server rooms 12X and 12Y rises and the temperature of the air sucked into the server 14 becomes high. Therefore, it is necessary to cool the exhaust heat air with the evaporators 20X and 20Y and then exhaust it to the server rooms 12X and 12Y.

  Underfloor chambers 18X and 18Y are formed under the floor surface 13 of each of the server rooms 12X and 12Y, and the underfloor chambers 18X and 18Y and the server are connected via a plurality of outlets (not shown) formed in the floor surface 13. The rooms 12X and 12Y are communicated. The underfloor chambers 18X and 18Y are supplied with air-conditioned air cooled by a package air conditioner or the like (not shown), and the air-conditioned air is blown out from the outlet to the server rooms 12X and 12Y. The air outlet is formed in the vicinity of the suction port 14A of the server 14, and the air-conditioned air is sucked into the server 14 so that the server 14 can be efficiently cooled.

  Further, the server 14 is locally cooled by the cooling system 10.

  The cooling system 10 constitutes a natural circulation cycle of a refrigerant mainly including evaporators 20X and 20Y, a cooling tower 22 as a condenser, a liquid pipe 24 through which a refrigerant liquid flows, and a gas pipe 26 through which a refrigerant gas flows.

  The evaporators 20X and 20Y are respectively provided in the vicinity of the server exhaust port 14B, and coils (not shown) are provided inside the evaporators 20X and 20Y. Exhaust hot air discharged from the server exhaust port 14B 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 rooms 12X and 12Y is cooled. Thus, the temperature environment of the server rooms 12X and 12Y can be set to a temperature environment necessary for the server 14 to operate normally in combination with the air-conditioning air blown from the outlet to the server rooms 12X and 12Y.

  The cooling tower 22 is a device that cools and condenses the refrigerant vaporized by the evaporators 20X and 20Y, and is installed at a position higher than the evaporators 20X and 20Y, for example, on the building rooftop of the server room 12. Since the cooling tower 22 shown in FIG. 1 is a schematic diagram, the detailed structure will be described with reference to FIGS.

  The evaporators 20X and 20Y and the cooling tower 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 the inlet of the heat exchange coil 28 in the cooling tower 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 evaporator 20X, It is connected to one end of a 20Y coil (not shown). On the other hand, the upper end of the liquid pipe 24 is connected to the outlet of the heat exchange coil 28 in the cooling tower 22, and the lower end of the liquid pipe 24 is branched into branch pipes 24X and 24Y, and the branch pipes 24X and 24Y evaporate. The other ends of the coils (not shown) of the containers 20X and 20Y are connected. Accordingly, the refrigerant gas vaporized by the evaporators 20X and 20Y rises up the gas pipe 26 and is naturally sent to the cooling tower 22, and after being liquefied by the cooling tower 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.

  Then, by controlling the flow rate of the naturally circulating refrigerant, the air temperature after the high-temperature air exhausted from the server 14 is cooled by the evaporators 20X and 20Y (from the server 14 to the server room 12X via the evaporators 20X and 20Y). , 12Y), and the server rooms 12X, 12Y are maintained in a temperature environment suitable for the server 14. That is, temperature sensors 23X and 23Y are provided in the vicinity of the outlet of the exhaust air 21 exhausted from the evaporators 20X and 20Y to the server rooms 12X and 12Y, and the branch pipes 24X and 24Y of the liquid pipe 24 are provided with refrigerant. Flow rate adjusting valves 25X and 25Y for adjusting the flow rate of the liquid are provided. The measured temperatures measured by the temperature sensors 23X and 23Y are input to the controller 17, and the controller 17 controls the opening degree of the flow rate adjusting valves 25X and 25Y based on the measured temperature. Thereby, it is possible to supply an appropriate refrigerant flow rate for the exhaust air temperature to be the same to the evaporators 20X and 20Y having different heights of the upper floor and the lower floor. As a result, the exhaust temperature exhausted from the server 14 to the server rooms 12X and 12Y via the evaporators 20X and 20Y can be adjusted to a temperature environment suitable for the operation of the server 14.

  Next, the structure of the cooling tower 22 in the present invention will be described with reference to FIG.

  As shown in FIG. 2, the cooling tower 22 has a cooling tower body (casing) 30 arranged in a horizontal shape, an intake port 30 </ b> A for taking in outside air is formed on one end side of the cooling tower body 30, and outside air is placed on the other end side. The exhaust port 30B is formed. A heat exchanging coil 28 is provided in the cooling tower main body 30, the inlet of the heat exchanging coil 28 is connected to the gas pipe 26 through which the refrigerant gas returning from the evaporators 20X and 20Y flows, and the outlet of the heat exchanging coil 28 is the evaporator 20X. , 20Y is connected to a liquid pipe 24 through which a refrigerant liquid to be supplied flows. The heat exchange coil 28, the gas pipe 26 and the liquid pipe 24 are connected via a connecting member 32. In addition, a sprinkler 34 is provided on the intake port 30 </ b> A side of the heat exchange coil 28, and a blower fan 36 is further provided on the intake port 30 </ b> A side of the sprinkler 34. Then, the outside air taken in from the intake port 30 </ b> A of the cooling tower body 30 by the blower fan 36 is blown to the heat exchange coil 28, and water is sprinkled from the sprinkler 34 to the heat exchange coil 28. Thereby, the refrigerant gas flowing through the heat exchange coil 28 is cooled and condensed by the outside air or water spray, and is liquefied into a refrigerant liquid. On the other hand, the intake outside air X taken into the cooling tower body 30 is deprived of heat from the refrigerant gas flowing through the heat exchange coil 28, rises in temperature, and is discharged as exhaust outside air Y from the exhaust port 30B.

  In addition, a connection hole 30C is opened on the side surface of the cooling tower body 30 on the intake port 30A side, and a part of the exhaust port 30B and the connection hole 30C are connected by a circulation duct 38. Thus, a portion of the exhaust outside air Y whose temperature has risen exhausted from the exhaust port 30B is circulated in the vicinity of the intake port 30A through the circulation duct 38, so that the exhaust outside air Y and the intake outside air X are mixed. As a result, the blower fan 36 increases the outside air temperature of the blown outside air Z blown to the heat exchange coil 28.

  Further, a damper device 40 is provided in the middle of the circulation duct 38, and the mixing amount (mixing) of the exhaust outside air Y mixed with the intake outside air X is adjusted by adjusting the opening degree of the damper device 40 (including zero opening degree). (Including zero).

  Further, the cooling tower 22 has a control mechanism 42 for controlling the air volume of the exhaust outside air Y flowing through the circulation duct 38 by the damper device 40 so that the condensation pressure of the refrigerant gas condensed by the heat exchange coil 28 becomes a predetermined pressure. Provided. Here, the predetermined pressure is, for example, a condensation pressure for obtaining a liquid column necessary for stable circulation of the refrigerant between the evaporators 20X and 20Y and the cooling tower 22 in the cooling system of the present invention. can do.

  The control mechanism 42 includes a refrigerant pressure sensor 44 that measures the pressure of the refrigerant gas at the inlet of the heat exchange coil 28, and a controller 46 that controls the damper device 40 so that the measured pressure of the refrigerant pressure sensor 44 becomes a predetermined pressure. can do. As the controller 46, the controller 17 shown in FIG. 1 may be used, or a controller 46 for the cooling tower 22 may be separately provided as shown in FIG. In this embodiment, a case where it is provided separately will be described.

  Next, the operation of the cooling tower 22 in the cooling system configured as described above will be described.

  As described above, three types of outside air, intake outside air X, exhaust outside air Y, and blown outside air Z, appear. That is, the intake outside air X refers to the outside air that has been taken in from the intake port 30A. The blown outside air Z refers to the outside air blown to the heat exchange coil 28 by the blower fan 36, and includes both the intake outside air X and the outside air mixed with the intake outside air X and the exhaust outside air Y. The exhaust outside air Y refers to outside air whose temperature has risen after the blown outside air Z contacts the heat exchange coil 28 and exchanges heat.

  Before the operation of the cooling system 10 is started, the opening degree of the damper device 40 is set to zero (closed state), and the operation is started in this state. That is, the refrigerant gas returning from the evaporators 20X and 20Y to the cooling tower 22 by the gas pipe 26 flows through the heat exchange coil 28 in the cooling tower 22 and the intake outside air X taken in from the intake port 30A by the blower fan 36. It cools and condenses by the water from the sprinkler 34. Thereby, the refrigerant gas is liquefied to become a refrigerant liquid, flows through the liquid pipe 24, and is supplied to the evaporators 20X and 20Y. On the other hand, the blown outside air Z in contact with the heat exchange coil 28 takes heat from the refrigerant gas, rises in temperature, becomes exhaust outside air Y, and is exhausted from the exhaust port 30B.

  The refrigerant gas in the heat exchange coil 28 is measured by the refrigerant pressure sensor 44 at the inlet of the heat exchange coil 28, and the measured pressure is sequentially transmitted to the controller 46. When the measured pressure of the refrigerant gas is lower than the predetermined pressure, the controller 46 opens the damper device 40 and circulates a part of the exhaust outside air Y whose temperature has risen to the vicinity of the intake port 30A via the circulation duct 38. Then, the air volume of the exhaust outside air Y flowing through the circulation duct 38 is controlled so that the measured pressure measured by the refrigerant pressure sensor 44 becomes a predetermined pressure by controlling the opening degree of the damper device 40. That is, when the measured pressure of the refrigerant gas is to be increased greatly, the opening degree of the damper device 40 is increased, and when it is desired to increase the measured pressure, the opening degree of the damper device 40 is decreased.

  Thereby, it is possible to prevent the condensing pressure in the cooling tower 22 from being lowered more than necessary by a simple structural improvement of the cooling tower 22 in winter when the outside air temperature is low, so that the cooling capacity of the evaporators 20X and 20Y is reduced. Can be prevented.

  FIG. 3 shows another aspect of the control mechanism 42. In addition, the same code | symbol is attached | subjected and demonstrated to the member and apparatus similar to FIG.

  As shown in FIG. 3, a blown outside air temperature sensor 48 that measures the temperature of the blown outside air Z after the intake outside air X and the exhaust outside air Y are mixed is provided. Further, the controller 46 provides correlation data between the predetermined pressure of the refrigerant gas at the inlet of the heat exchange coil 28 and the set temperature of the blown outside air Z, that is, how many times the refrigerant gas reaches the predetermined pressure when the blown outside air Z is increased. Correlation data is input in advance. The creation of correlation data can be obtained by a preliminary test or the like.

  Then, the controller 46 controls the opening degree of the damper device 40 based on the correlation data so that the measured temperature of the blower outside air temperature sensor 48 becomes the set temperature.

  Thereby, it is possible to prevent the condensing pressure in the cooling tower 22 from being lowered more than necessary by a simple structural improvement of the cooling tower 22 in winter when the outside air temperature is low, so that the cooling capacity of the evaporators 20X and 20Y is reduced. Can be prevented.

  FIG. 4 shows still another aspect of the control mechanism. In addition, the same code | symbol is attached | subjected and demonstrated to the member and apparatus similar to FIG.2 and FIG.3.

  As shown in FIG. 4, a refrigerant liquid temperature sensor 45 that measures the temperature of the refrigerant liquid liquefied by the heat exchange coil 28 is provided at the outlet of the heat exchange coil 28, and the measured temperature is sequentially transmitted to the controller 46. The controller 46 is preliminarily input with correlation data between the refrigerant pressure and temperature. The correlation data can be referred to a freezing air-conditioning handbook. Then, the controller 46 controls the opening degree of the damper device 40 so that the measured temperature of the refrigerant liquid temperature sensor 45 becomes the set temperature based on the correlation data.

  This makes it possible to prevent the condensation pressure in the cooling tower 22 from being lowered more than necessary by simply improving the structure of the cooling tower 22 even in winter when the outside air temperature is low, so that the cooling capacity of the evaporators 20X and 20Y is reduced. Can be prevented.

  The control mechanism 42 in FIGS. 3 and 4 indirectly controls the refrigerant gas pressure at the inlet of the heat exchange coil 28 to be controlled to a predetermined pressure by measuring the temperature of the blown outside air and the temperature of the refrigerant liquid. .

  In the present embodiment, the example of the cooling system 10 in which the refrigerant naturally circulates has been described. However, the present invention can also be applied to a cooling system in which the refrigerant is forcedly circulated. The object to be cooled by the evaporators 20X and 20Y is not limited to electronic devices such as servers, and can be applied to a heating element that needs to be cooled.

  DESCRIPTION OF SYMBOLS 10 ... Cooling system of electronic equipment, 12X, 12Y ... Server room, 13 ... Floor surface, 14 ... Server, 15 ... Cooling device, 17 ... Controller, 18X, 18Y ... Underfloor chamber, 20X, 20Y ... Evaporator, 22 ... Condensation 23X, 23Y ... temperature sensor, 24 ... liquid piping, 24X, 24Y ... branch pipe, 25X, 25Y ... flow control valve, 26 ... gas pipe, 26X, 26Y ... branch pipe, 28 ... heat exchange coil, 30 ... cooling Tower body 32. Connecting means 34 34 Sprinkler 36 36 Fan, 38 Circulating duct 40 Damper device 42 Control mechanism 44 Refrigerant pressure sensor 45 Refrigerant liquid temperature sensor 46 Controller 48 ... Blower outside temperature sensor, 50 ... Refrigerant gas calorie measuring means, 52 ... Calculation means, X ... Intake outside air, Y ... Exhaust outside air, Z ... Blast outside air

Claims (6)

In the cooling system using the cooling tower as the condenser, while circulating the refrigerant between the evaporator that vaporizes the refrigerant and the condenser that liquefies the refrigerant vaporized by the evaporator,
The cooling tower is
A cooling tower body in which an outside air intake port and an exhaust port are formed;
A heat exchange coil provided in the cooling tower main body, connected to a gas pipe through which refrigerant gas flowing back from the evaporator flows through an inlet and connected to a liquid pipe through which refrigerant liquid supplied to the evaporator flows out from the evaporator;
A watering machine for watering the heat exchange coil;
A blower that takes in outside air from the intake port and blows air to the heat exchange coil and exhausts air from the exhaust port;
A circulation duct for returning a part of the exhaust outside air exhausted from the exhaust port to the vicinity of the intake port and mixing it with the intake external air from the intake port;
An air volume adjusting means for adjusting the air volume of the exhaust outside air flowing through the circulation duct;
And a control mechanism for controlling the air volume adjusting means so that the condensing pressure of the refrigerant gas condensed by the heat exchange coil becomes a predetermined pressure. The control mechanism is
A refrigerant pressure sensor for measuring the pressure of the refrigerant gas at the inlet of the heat exchange coil;
The cooling system according to claim 1, further comprising a controller that controls the air volume adjusting means so that a measured pressure of the refrigerant pressure sensor becomes the predetermined pressure. The control mechanism is
A blower outside air temperature sensor that measures the temperature of the blown outside air that is blown to the heat exchange coil by the blower,
A set temperature of the blown outside air for setting the condensation pressure of the refrigerant gas condensed in the heat exchange coil to a predetermined pressure is input in advance, and the air volume is adjusted so that the measured temperature of the blown outside air temperature sensor becomes the set temperature. 2. The cooling system according to claim 1, further comprising a controller for controlling the adjusting means. The control mechanism is
A refrigerant liquid temperature sensor for measuring the temperature of the refrigerant liquid at the outlet of the heat exchange coil;
A preset temperature of the refrigerant liquid for setting the pressure of the refrigerant gas at the inlet of the heat exchange coil to a predetermined pressure is input in advance, and the air volume adjusting means is set so that the measured temperature of the refrigerant liquid temperature sensor becomes the set temperature. The cooling system according to claim 1, further comprising a controller for controlling the cooling system.   The cooling system is a system for cooling an electronic device disposed in a server room, and the evaporator vaporizes a refrigerant by exchanging heat with exhaust heat air from the electronic device, and in the server room. The cooling system according to any one of claims 1 to 4, wherein the exhaust heat air to be exhausted is cooled.   The cooling system according to any one of claims 1 to 5, wherein the cooling tower is disposed higher than the evaporator and the refrigerant is naturally circulated.

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