Ejector-type cooling device and cooling system

Abstract

To stabilize the pressure of the cooling water supplied. [Solution] The ejector-type cooling device (10) comprises a condenser (18) that condenses a refrigerant by exchanging heat with radiant water (H1), a steam generator (14) to which refrigerant discharged from a refrigerant pump (12) that circulates the refrigerant condensed in the condenser is supplied and which exchanges heat with hot water (W1), an evaporator (20) to which refrigerant is supplied from a branch between the condenser and the refrigerant pump via an expansion valve (22) and which exchanges heat with hot water (W3) and evaporates, an ejector (16) to which the refrigerant evaporated in the steam generator is supplied to a drive outlet and supplied to the condenser from the discharge port, and which also sucks in the refrigerant supplied from the evaporator through a suction port, a radiant water supply channel (26) that supplies radiant water to the condenser, a radiant water recovery channel (28) that recovers radiant water from the condenser, a bypass channel (34) connected to the radiant water supply channel and the radiant water recovery channel, and a bypass-side control valve (36) provided on the bypass channel.

Description

Technical Field

[0001] The present invention relates to an ejector type cooling device and a cooling system.

Background Art

[0002] Patent Document 1 discloses an ejector type cooling device including a condenser that exchanges heat between the refrigerant supplied from an ejector and cooling water, a steam generator and an evaporator that exchange heat between the refrigerant and hot water to evaporate the refrigerant. In Patent Document 1, the evaporator is connected such that hot water flows in series on the downstream side with respect to the steam generator, and an auxiliary heat exchanger cools the hot water between the serially connected steam generator and evaporator. Cooling water supplied to the condenser is branched and supplied to the auxiliary heat exchanger.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] Regarding the above ejector type cooling device, cooling water is supplied via a pump, and in some cases, one pump supplies cooling water to a plurality of ejector type cooling devices, or simultaneously supplies cooling water to another device that uses cooling water in addition to the ejector type cooling device. In such cases, when the number of devices using cooling water changes, there is a problem that the pressure in the cooling water piping also changes and becomes unstable.

[0005] In view of such circumstances, the present invention has been made, and an object thereof is to provide an ejector type cooling device and a cooling system capable of stabilizing the pressure of the supplied cooling heat radiation water.

Means for Solving the Problems

[0006] An ejector-type cooling system according to one embodiment of the present invention includes a condenser that condenses a gaseous refrigerant by heat exchange with cooling water, a refrigerant pump that pressurizes and circulates the refrigerant condensed in the condenser, a steam generator to which the refrigerant discharged from the refrigerant pump is supplied and which evaporates by heat exchange with cooling hot water, and a steam generator to which the refrigerant is supplied from a branch between the condenser and the refrigerant pump via an expansion valve and which evaporates by heat exchange with the cooling hot water. Furthermore, the cooling hot water is connected to the steam generator so that it flows in series downstream. An evaporator, an ejector that receives the refrigerant evaporated in the steam generator from the drive port and supplies it to the condenser from the discharge port, and further draws in the refrigerant supplied from the evaporator from the suction port, An auxiliary heat exchanger is connected between the steam generator and the evaporator so that the cooling hot water flows in series, and which cools the cooling hot water by exchanging heat with the heat dissipation water. The condenser and the auxiliary heat exchanger A heat dissipation water supply channel for supplying the heat dissipation water, and the condenser and the auxiliary heat exchanger An ejector-type cooling device comprising a heat dissipation water recovery channel for recovering the heat dissipation water from, The heat dissipation water supply channel is branched from the pre-branch channel into a first branch channel whose downstream end is connected to the condenser and a second branch channel whose downstream end is connected to the auxiliary heat exchanger, and the heat dissipation water recovery channel is merged in a post-merging channel into a first confluence channel whose upstream end is connected to the condenser and a second confluence channel whose upstream end is connected to the auxiliary heat exchanger, the first branch channel is provided with a condenser control valve for adjusting the flow rate of the heat dissipation water introduced into the condenser, and the second branch channel is provided with an auxiliary heat exchanger control valve for adjusting the flow rate of the heat dissipation water introduced into the auxiliary heat exchanger. The aforementioned heat dissipation water supply channel The aforementioned channel before branching and the aforementioned heat dissipation water recovery channel The channel after the merger It is characterized by comprising a bypass channel connected to a bypass channel and a bypass-side control valve provided on the bypass channel.

[0007] One embodiment of the present invention is a cooling system comprising a plurality of ejector-type cooling devices, characterized in that it comprises a cooling device that supplies the heat-dissipating water to the plurality of ejector-type cooling devices. [Effects of the Invention]

[0008] According to the present invention, even if the number of devices that utilize and do not utilize the heat dissipation water changes in a plurality of devices to which heat dissipation water is supplied, including an ejector-type cooling device, the pressure of the heat dissipation water can be stabilized by adjusting the heat dissipation water flowing through the bypass channel with a bypass-side control valve. [Brief explanation of the drawing]

[0009] [Figure 1] This is a block diagram showing the configuration of a cooling system to which the ejector-type cooling device according to the embodiment is applied. [Figure 2]This is a circuit diagram showing the configuration of an ejector-type cooling device according to an embodiment. [Modes for carrying out the invention]

[0010] The ejector-type cooling device according to the embodiment will be described below with reference to the attached drawings. Note that the present invention is not limited to the embodiments described below, and can be modified as appropriate without changing its essence. In the following figures, some components may be omitted for the sake of explanation.

[0011] Figure 1 is a block diagram showing the configuration of a cooling system to which the ejector-type cooling device according to the embodiment is applied. In Figure 1, the cooling system 1 includes an ejector-type cooling device 10 connected to a heat-generating device 2, and a cooling device 3 connected to the ejector-type cooling device 10. The ejector-type cooling device 10 will be described later.

[0012] Here, heat-generating equipment 2 can be exemplified by IT equipment such as servers, storage, and communication units installed and operated in a data center. Data centers have become increasingly widespread in recent years due to the development of the information society and AI technology, and management to maintain temperatures suitable for the operation of servers and other equipment is required. In data centers, the role of cooling system 1 is considered particularly important in order to ensure the stable operation of high-performance GPU (Graphics Processing Unit) servers, which generate enormous amounts of heat.

[0013] The ejector-type cooling device 10 cools the hot water W1 (cooling water) discharged from the heat-generating equipment 2, which has reached a high temperature of, for example, 47°C, to a temperature of, for example, 36°C, and returns it to the heat-generating equipment 2. The hot water W1, which has reached a high temperature through the cooling process of the heat-generating equipment 2, is then used. Thus, in the cooling system 1, a circulation system of hot water W1 and W2 is formed in which the ejector-type cooling device 10 cools the hot water W1 after it has been used for the cooling process by the heat-generating equipment 2 and returns it to the heat-generating equipment 2 again as cooling water W2.

[0014] The heat-generating device 2 is not limited to the devices described above, but may also be a mold or molding device such as an aluminum die-casting machine. Furthermore, the heat-generating device 2 that supplies hot water W1 to the ejector-type cooling device 10 may be different from the heat-generating device 2 that supplies hot water W2.

[0015] The cooling device 3 is composed of, for example, a cooling tower and circulates radiant water H1 and H2 as cooling media with the ejector-type cooling device 10. The cooling device 3 supplies low-temperature radiant water H1 to the ejector-type cooling device 10 via a radiant water pump 5, and cools the radiant water H2 that has returned to the ejector-type cooling device 10 at a high temperature after heat exchange with the refrigerant or hot water W1 flowing through the ejector-type cooling device 10, bringing it back to a low temperature. Thus, in the cooling system 1, a circulation system of radiant water H1 and H2 is formed in which the cooling device 3 cools the radiant water H2 that has been used by the ejector-type cooling device 10 to dissipate heat from the refrigerant or hot water W1, and returns it to the ejector-type cooling device 10 as radiant water H1 again.

[0016] In the cooling system 1 of this embodiment, multiple (five in Figure 1) ejector-type cooling devices 10 are connected in parallel to the cooling device 3. The cooling system 1 includes branch supply paths 7 and branch recovery paths 8 that branch at branching points 7a and 8a to connect the cooling device 3 and each ejector-type cooling device 10, and a heat dissipation water pump 5 is provided upstream of branching point 7a in the branch supply path 7. Therefore, by driving the heat dissipation water pump 5, heat dissipation water H1 and H2 can be circulated to all ejector-type cooling devices 10.

[0017] Although Figure 1 shows only one cooling device 3, the cooling system 1 may use multiple cooling devices 3 connected in series or parallel.

[0018] FIG. 2 is a circuit diagram showing the configuration of an ejector type cooling device in an embodiment. The ejector type cooling device 10 includes a refrigerant pump 12, a steam generator 14, an ejector 16, a condenser 18, an evaporator 20, an expansion valve 22, and an auxiliary heat exchanger 24. The refrigerant pump 12 pressurizes the liquid-phase refrigerant and circulates it in the circuit. The steam generator 14 is supplied with the refrigerant discharged from the refrigerant pump 12, exchanges heat with the warm water W1, and evaporates it.

[0019] The ejector 16 is supplied with the refrigerant evaporated in the steam generator 14 to the driving port 16a and supplied to the condenser 18. The condenser 18 condenses the gaseous refrigerant supplied from the ejector 16 by exchanging heat with the heat dissipation water H1 supplied through the heat dissipation water supply flow path 26 from the cooling device 3. The heat dissipation water H2 that has exchanged heat with the refrigerant in the condenser 18 is discharged to the cooling device 3 through the heat dissipation water recovery flow path 28.

[0020] Here, the heat dissipation water supply flow path 26 is connected to the branch supply path 7, and the heat dissipation water recovery flow path 28 is connected to the branch recovery path 8. The heat dissipation water supply flow path 26 includes a pre-branch flow path 26b through which the heat dissipation water H1 flows upstream of the branch portion 26a, and a first branch flow path 26c and a second branch flow path 26d that are branched at the branch portion 26a and through which the heat dissipation water H1 flows downstream of the branch portion 26a. The pre-branch flow path 26b is connected to the branch supply path 7 at its upstream end. The first branch flow path 26c is connected to the condenser 18 at its downstream end. The second branch flow path 26d is connected to the auxiliary heat exchanger 24 at its downstream end. By the heat dissipation water supply flow path 26, the heat dissipation water H1 branches and flows at the branch portion 26a and is supplied to the condenser 18 and the auxiliary heat exchanger 24.

[0021] The heat-releasing water recovery flow path 28 includes a post-confluence flow path 28b through which the heat-releasing water H2 flows on the downstream side of the confluence portion 28a, a first confluence flow path 28c and a second confluence flow path 28d that are confluent at the confluence portion 28a and through which the heat-releasing water H2 flows on the upstream side of the confluence portion 28a. The post-confluence flow path 28b is connected to the branch recovery path 8 at its downstream end. The first confluence flow path 28c is connected to the condenser 18 at its upstream end. The second confluence flow path 28d is connected to the auxiliary heat exchanger 24 at its upstream end. The heat-releasing water H2 is collected and discharged after confluence from the condenser 18 and the auxiliary heat exchanger 24 by the heat-releasing water recovery flow path 28.

[0022] In the refrigerant circuit, a branch portion B is provided between the condenser 18 and the refrigerant pump 12. The refrigerant condensed in the condenser 18 is introduced into the refrigerant pump 12 through the branch portion B of the refrigerant circuit and circulates in the circuit. A reservoir tank may be provided in the flow path flowing from the condenser 18 to the refrigerant pump 12.

[0023] The expansion valve 22 is provided between the branch portion B of the refrigerant circuit and the evaporator 20, and controls the liquid-phase refrigerant supplied from the condenser 18 to a predetermined low pressure.

[0024] The evaporator 20 evaporates the refrigerant supplied through the branch portion B and the expansion valve 22 by exchanging heat with the warm water W3 (cooled warm water). The evaporator 20 is connected such that the warm water W3 flows in series on the downstream side with respect to the steam generator 14. The warm water W2 cooled by exchanging heat with the refrigerant in the evaporator 20 is led out to the heat-generating device 2. In the evaporator 20, the refrigerant becomes a low-pressure refrigerant generated by the suction action of the ejector 16, and is cooled to become low-temperature warm water W2 by utilizing its latent heat.

[0025] The refrigerant evaporated in the evaporator 20 is supplied to the suction port 16c of the ejector 16 and sucked in from the suction port 16c. In the ejector 16, the high-pressure refrigerant introduced from the drive port 16a is depressurized by a nozzle (not shown) and ejected. At this time, the refrigerant is sucked into the main body as a suction flow through the suction port 16c, and the drive flow and suction flow are mixed and pressurized through the merging / mixing section and diffuser, and then discharged from the discharge port 16b. The refrigerant discharged from the discharge port 16b is supplied to the condenser 18, where it condenses into a liquid phase refrigerant by exchanging heat with the heat dissipation water H1, and then introduced to the evaporator 20 via the expansion valve 22.

[0026] The nozzle of the ejector 16 reduces pressure and accelerates the refrigerant, while the diffuser reduces pressure and increases it. The nozzle may be configured as a variable nozzle type, allowing adjustment of the flow rate of the drive flow.

[0027] The auxiliary heat exchanger 24 cools the hot water W3 by exchanging heat with the heat-extracting water H1, and is installed in series between the steam generator 14 and the evaporator 20. In other words, of the hot water W3 between the steam generator 14 and the evaporator 20, the hot water W31 on the upstream side, which is relatively hot, is cooled to the hot water W32 on the downstream side.

[0028] The radiated water H1 that exchanges heat with the hot water W3 in the auxiliary heat exchanger 24 is supplied via the second branch channel 26d of the radiated water supply channel 26. The radiated water H2 that has exchanged heat with the hot water W3 in the auxiliary heat exchanger 24 is led out via the second confluence channel 28d of the radiated water recovery channel 28. Since the radiated water H1 used in the auxiliary heat exchanger 24 is supplied via a branch in the radiated water supply channel 26, there is no need to prepare a separate dedicated cooling source.

[0029] The ejector-type cooling system 10 further includes a condenser control valve 30 and an auxiliary heat exchanger control valve 32. The condenser control valve 30 adjusts the flow rate of the heat dissipation water H1 introduced into the condenser 18 to adjust the condenser 18's ability to condense the refrigerant. The auxiliary heat exchanger control valve 32 adjusts the flow rate of the heat dissipation water H1 introduced into the auxiliary heat exchanger 24 to adjust the auxiliary heat exchanger 24's ability to cool the hot water W3.

[0030] As shown in Figure 2, the hot water W1 to W3 are cooled in the order of steam generator 14, auxiliary heat exchanger 24, and evaporator 20. The steam generator 14 is located at the upstream end because it requires a sufficient amount of heat to be added to the input high-pressure refrigerant in order to output the refrigerant as a high-temperature, high-pressure gas drive to the ejector 16. The evaporator 20 is located at the downstream end because it is necessary to exchange heat with the refrigerant, which has become cold in the expansion valve 22, in order to effectively utilize the heat exchange capacity and sufficiently cool the hot water W3 before outputting it. Therefore, it is preferable to install the auxiliary heat exchanger 24, which is used to further cool the hot water W3, in series between the steam generator 14 and the evaporator 20.

[0031] In the ejector-type cooling system 10, in order to further lower the temperature of the output hot water W2, it is conceivable to increase the rotational speed of the refrigerant pump 12 and increase the amount of refrigerant supplied to the steam generator 14. However, since the steam generator 14 has the function of supplying a drive flow to the ejector 16 in addition to cooling the supplied hot water W1, there is a limit to the amount of refrigerant that can be sufficiently gasified as a drive flow. Therefore, even if there is surplus capacity in the condenser 18 to dissipate the heat from the refrigerant, the amount of refrigerant supplied to the steam generator 14 cannot be increased beyond a predetermined level, and it is desirable to provide an auxiliary heat exchanger 24 as an alternative cooling means.

[0032] The ejector-type cooling device 10 further includes a bypass channel 34 connected to the heat dissipation water supply channel 26 and the heat dissipation water recovery channel 28, a bypass-side control valve 36 provided on the bypass channel 34, a supply-side pressure detection unit 38, and a recovery-side pressure detection unit 40.

[0033] One end of the bypass channel 34 is connected to the connection point 26e in the pre-branch channel 26b of the heat dissipation water supply channel 26. The other end of the bypass channel 34 is connected to the connection point 28e in the post-merging channel 28b of the heat dissipation water recovery channel 28. Therefore, it is possible to guide all or part of the heat dissipation water H1 supplied to the pre-branch channel 26b through the bypass channel 34 to the post-merging channel 28b.

[0034] The bypass-side control valve 36 adjusts the flow rate of the heat dissipation water H1 introduced into the bypass flow path 34, and also adjusts the flow rate of the heat dissipation water H1 supplied to the condenser 18 and the auxiliary heat exchanger 24.

[0035] The supply-side pressure detection unit 38 detects the pressure of the radiated water H1 upstream of the connection point 26e with the bypass channel 34 in the radiated water supply channel 26. The recovery-side pressure detection unit 40 detects the pressure of the radiated water H2 downstream of the connection point 28e with the bypass channel 34 in the radiated water recovery channel 28.

[0036] The ejector-type cooling device 10 further includes a control unit 42 that performs overall control of the ejector-type cooling device 10. Although not shown in the figures, the control unit 42 is connected to each device in the ejector-type cooling device 10 that performs input / output to the control unit 42 by wired or wireless communication lines. The control unit 42 is not limited in terms of installation location, processing capacity, number of main processing units, peripheral devices, etc. The control unit 42 may be implemented by, for example, causing a processing unit such as a CPU (Central Processing Unit) to execute a program, i.e., by software, or by hardware such as an IC (Integrated Circuit), or by using a combination of software and hardware.

[0037] The control unit 42 controls the valve opening of each control valve 30, 32, and 36, the rotational speed of the refrigerant pump 12, and the opening of the expansion valve 22. For example, based on the detection results of the supply-side pressure detection unit 38 and the recovery-side pressure detection unit 40, the control unit 42 controls the valve opening of each control valve 30, 32, and 36 so that the pressure of the heat dissipation water H1 and H2 in each flow path 26 and 28 is within a predetermined pressure range. In this control, the correspondence between the valve opening of each control valve 30, 32, and 36 and each flow path 26 and 28 is determined in advance as a table, database, or formula and stored in the storage means of the control unit 42.

[0038] During operation of the ejector-type cooling system 10, by opening the condenser control valve 30 and the auxiliary heat exchanger control valve 32, the heat dissipation water H1 supplied from the heat dissipation water supply channel 26 is used for cooling by the condenser 18 and the auxiliary heat exchanger 24. More specifically, the heat dissipation water H1 is branched from the heat dissipation water supply channel 26 and introduced to the condenser 18 and the auxiliary heat exchanger 24, and the high-temperature heat dissipation water H2 that has undergone heat exchange is merged and recovered in the heat dissipation water recovery channel 28. At this time, the flow rate of heat dissipation water H1 flowing through the bypass channel 34 changes according to the valve opening degree of the bypass-side control valve 36, and the pressure of the heat dissipation water H1 and H2 in each channel 26 and 28 changes.

[0039] During operation of the ejector-type cooling system 10, the supply-side pressure detection unit 38 detects the pressure of the heat-dissipating water H1 flowing through the pre-branch channel 26b of the heat-dissipating water supply channel 26. Additionally, the recovery-side pressure detection unit 40 detects the pressure of the heat-dissipating water H2 flowing through the post-merger channel 28b of the heat-dissipating water recovery channel 28. The detection results from each pressure detection unit 38 and 40 are output to the control unit 42.

[0040] The control unit 42 determines the valve opening of the bypass-side control valve 36 based on stored tables, the detection results of each pressure detection unit 38, 40, and the valve openings of the condenser control valve 30 and the auxiliary heat exchanger control valve 32, and controls the valve opening. This adjusts the pressure of the heat dissipation water H1, H2 in each flow path 26, 28 to be within a predetermined range.

[0041] On the other hand, when stopping the operation of the ejector-type cooling system 10, the control valve for the condenser 30 and the control valve for the auxiliary heat exchanger 32 are closed, and the bypass control valve 36 is opened. As a result, all of the heat-dissipating water H1 supplied from the heat-dissipating water supply channel 26 is introduced into the bypass channel 34 without heat exchange and is recovered in the heat-dissipating water recovery channel 28.

[0042] Here, if all the control valves 30, 32, and 36 are closed to stop the operation of the ejector-type cooling device 10, the supply of radiating water H1 to the ejector-type cooling device 10 will cease. Therefore, in a cooling system 1 having multiple ejector-type cooling devices 10, the number of ejector-type cooling devices 10 that utilize the radiating water H1 will decrease, and the supply pressure of the radiating water H1 will increase accordingly.

[0043] In this embodiment, by opening the bypass-side control valve 36 that stops the operation of the ejector-type cooling device 10, the heat dissipation water H1 can be introduced into the bypass passage 34, thus maintaining the number of ejector-type cooling devices 10 to which heat dissipation water H1 is supplied in the cooling system 1. As a result, even if the number of ejector-type cooling devices 10 that are stopped changes, it is possible to suppress changes in the supply pressure of heat dissipation water H1 in each ejector-type cooling device 10, and stabilize the pressure of heat dissipation water H1 in all ejector-type cooling devices 10. As a result, it is possible to easily control the pressure of heat dissipation water H1 in all ejector-type cooling devices 10, and prevent the heat dissipation water H1 from becoming high pressure and putting a load on the piping.

[0044] It should be noted that the present invention is not limited to the embodiments described above, and can be implemented with various modifications. In the embodiments described above, the size, shape, orientation, etc., shown in the accompanying drawings are not limited thereto, and can be appropriately modified within the scope that allows the present invention to exert its effects. Furthermore, it can be implemented with appropriate modifications as long as it does not deviate from the scope of the objectives of the present invention.

[0045] For example, if the pressure of the heat dissipation water H1 can be adjusted by controlling the bypass-side control valve 36 in the same manner as described above, based solely on the detection results of the supply-side pressure detection unit 38, then the recovery-side pressure detection unit 40 may be omitted.

[0046] Furthermore, if a pressure gauge is provided outside the ejector-type cooling device 10, such as in the branch supply line 7, and the pressure of the heat dissipation water H1 can be adjusted by controlling the bypass-side control valve 36 based on the detection result of the pressure gauge, as described above, then the supply-side pressure detection unit 38 and the recovery-side pressure detection unit 40 may be omitted.

[0047] Furthermore, in the heat dissipation water supply channel 26, the position of the connection portion 26e of the bypass channel 34 may be changed to be between the branch portion 26a of the first branch channel 26c and the condenser control valve 30.

[0048] Furthermore, in the above embodiment, the auxiliary heat exchanger 24 may be omitted, and the heat-dissipating water H1 and H2 may be supplied and recovered in the condenser 18 and bypass channel 34 without being branched or merged in the heat-dissipating water supply channel 26 and the heat-dissipating water recovery channel 28. In this configuration, the hot water W1 and W2 may not be connected to flow in series through the steam generator 14 and the evaporator 20, but rather supplied to the steam generator 14 and the evaporator 20 via independent paths.

[0049] Furthermore, although one ejector 16 was illustrated and described in the above embodiment, multiple ejectors may be provided by arranging them in parallel. [Explanation of Symbols]

[0050] 1: Cooling system 3: Cooling device 10: Ejector-type cooling device 12: Refrigerant pump 14: Steam generator 16: Ejector 16a: Drive outlet 16b:Discharge port 16c: Suction port 18: Condenser 20: Evaporator 22: Expansion valve 24:Auxiliary heat exchanger 26: Heat dissipation water supply channel 26e: Connection part 28: Heat dissipation water recovery channel 28e: Connection part 34: Bypass channel 36: Bypass side control valve 38: Supply side pressure detection unit 40: Recovery side pressure detection unit 42: Control Unit H1: Facility water H2: Facility water W1: Hot water (cooled hot water) W2: Hot water (cooling hot water) W3: Hot water (cooled hot water)

Claims

1. A condenser that condenses a gaseous refrigerant by exchanging heat with a heat-dissipating water, A refrigerant pump that pressurizes and circulates the refrigerant condensed in the condenser, A steam generator to which the refrigerant discharged from the refrigerant pump is supplied and which exchanges heat with cooling hot water to evaporate it, The refrigerant is supplied from a branch between the condenser and the refrigerant pump via an expansion valve, and evaporates by exchanging heat with the cooling hot water, and the evaporator is connected such that the cooling hot water flows in series downstream to the steam generator. The refrigerant evaporated in the steam generator is supplied to the drive port and supplied to the condenser from the discharge port, and the ejector further draws in the refrigerant supplied from the evaporator through the suction port, An auxiliary heat exchanger is connected between the steam generator and the evaporator so that the cooling hot water flows in series, and which cools the cooling hot water by exchanging heat with the heat dissipation water. A heat dissipation water supply channel for supplying the heat dissipation water to the condenser and the auxiliary heat exchanger, An ejector-type cooling system comprising a heat dissipation water recovery channel for recovering the heat dissipation water from the condenser and the auxiliary heat exchanger, The heat dissipation water supply channel is branched from the channel before branching into a first branch channel whose downstream end is connected to the condenser and a second branch channel whose downstream end is connected to the auxiliary heat exchanger. The heat dissipation water recovery channel is formed by the confluence of a first confluence channel, whose upstream end is connected to the condenser, and a second confluence channel, whose upstream end is connected to the auxiliary heat exchanger, in a post-confluence channel. The first branch channel is provided with a condenser control valve for adjusting the flow rate of the heat dissipation water introduced into the condenser. The second branch channel is provided with an auxiliary heat exchanger control valve for adjusting the flow rate of the heat dissipation water introduced into the auxiliary heat exchanger. A bypass channel connected to the pre-branch channel of the heat dissipation water supply channel and the post-merging channel of the heat dissipation water recovery channel, An ejector-type cooling device characterized by comprising a bypass-side control valve provided on the bypass flow path.

2. A supply-side pressure detection unit for detecting the pressure of the heat-dissipating water upstream of the connection point with the bypass channel in the heat-dissipating water supply channel, The ejector-type cooling device according to claim 1, further comprising a control unit that controls the opening degree of the bypass-side adjustment valve based on the detection result of the supply-side pressure detection unit.

3. The recovery side pressure detection unit further includes a unit for detecting the pressure of the heat-dissipating water downstream of the connection point with the bypass channel in the heat-dissipating water recovery channel, The ejector-type cooling device according to claim 2, characterized in that the control unit controls the opening degree of the bypass-side adjustment valve based on the detection results of the supply-side pressure detection unit and the recovery-side pressure detection unit.

4. A cooling system comprising a plurality of ejector-type cooling devices according to any one of claims 1 to 3, A cooling system characterized by comprising a cooling device that supplies the heat dissipation water to a plurality of ejector-type cooling devices.

5. Having a branch supply path and a branch recovery path connecting the cooling device and a plurality of ejector-type cooling devices, By branching at the branching point of the aforementioned branch supply path, the heat dissipation water supply channels of multiple ejector-type cooling devices are connected to the aforementioned branch supply path. By branching at the branching point of the aforementioned branched recovery path, the heat dissipation water recovery channels of multiple ejector-type cooling devices are connected to the aforementioned branched recovery path. The cooling system according to claim 4, characterized in that the bypass channel is connected to the heat dissipation water supply channel located downstream of the branching point of the branch supply channel and the heat dissipation water recovery channel located upstream of the branching point of the branch recovery channel.

Images