Refrigerating system, refrigerating equipment and control method

Abstract

The invention relates to a refrigerating system, refrigerating equipment and a control method, the refrigerating system comprises a compressor (1), a condenser (2) and a heat exchange device (3), and in a refrigerating mode of the refrigerating system, the condenser (2), the compressor (1) and the heat exchange device (3) are configured to form a refrigerant circulation loop; an ejector (4), a nozzle of the ejector (4) is connected with the condenser (2), an injection area of the ejector (4) is connected with the heat exchange device (3), and the ejector (4) is configured to mix refrigerants from the heat exchange device (3) and the condenser (2) and increase the pressure of the refrigerants; and a cold storage device (5) which is connected to the outlet of the ejector (4) and the inlet of the compressor (1), and which is configured to store or discharge the cold of the refrigerant from the outlet of the ejector (4).

Description

Technical Field

[0001] The present disclosure relates to the field of refrigeration technology, and in particular to a refrigeration system, a refrigeration device and a control method. Background Art

[0002] With the rapid development of information technology, the demand for heat dissipation in data centers is increasing, and traditional heat dissipation technology is gradually showing its shortcomings in high-density computing environments.

[0003] Related technologies use liquid cooling technology to dissipate heat in data centers. Liquid cooling technology has stronger heat dissipation capabilities, but the compressor power consumption in the refrigeration system of the prior art is large, resulting in large energy losses in the system. Summary of the invention

[0004] In view of this, embodiments of the present disclosure provide a refrigeration system, a refrigeration device, and a control method, which can improve system performance.

[0005] In one aspect of the present disclosure, there is provided a refrigeration system, comprising:

[0006] A compressor, a condenser and a heat exchange device, wherein the condenser, the compressor and the heat exchange device are configured to form a refrigerant circulation loop in a refrigeration mode of the refrigeration system;

[0007] an ejector, a nozzle of the ejector being connected to the condenser, an ejection zone of the ejector being connected to the heat exchange device, the ejector being configured to mix the refrigerant from the heat exchange device and the condenser and to increase the pressure of the refrigerant; and

[0008] The cold storage device is connected to the outlet of the ejector and the inlet of the compressor, respectively, and is configured to store cold energy of the refrigerant from the outlet of the ejector or release cold energy.

[0009] In some embodiments, the refrigeration system also has a cold storage mode and a cooling release mode. The cold storage device is configured to exchange heat with the refrigerant from the outlet of the ejector in the cold storage mode of the refrigeration system and allow the gaseous refrigerant to enter the compressor, and to exchange heat with the refrigerant from the heat exchange device in the cooling release mode and reduce the temperature of the refrigerant entering the heat exchange device.

[0010] In some embodiments, the refrigeration system further comprises:

[0011] A first valve is connected to the outlet of the ejector, the inlet of the cold storage device and the inlet of the heat exchange device respectively;

[0012] The second valve is connected to the ejection area of ​​the ejector, the outlet of the cold storage device and the outlet of the heat exchange device respectively;

[0013] A pump body, connected to the cold storage device and the heat exchange device respectively; and

[0014] The controller is connected to the first valve and the second valve signal, and is configured to switch the first valve and the second valve on and off so that the compressor, condenser, heat exchange device, ejector and cold storage device form a refrigerant circulation loop in the cold storage mode of the refrigeration system, and the pump body, cold storage device and heat exchange device form a refrigerant circulation loop in the cooling mode of the refrigeration system.

[0015] In some embodiments, the refrigeration system further comprises:

[0016] A third valve, disposed in the pipeline between the outlet of the condenser and the heat exchange device, configured to adjust the refrigerant flow between the outlet of the condenser and the heat exchange device; and

[0017] a fourth valve, disposed in a pipeline between the outlet of the condenser and the nozzle of the ejector, configured to adjust a refrigerant flow rate between the outlet of the condenser and the nozzle of the ejector;

[0018] The controller is connected to the third valve and the fourth valve signals, and is configured to enable the third valve to adjust the refrigerant flow between the outlet of the condenser to the heat exchange device, and to enable the fourth valve to adjust the refrigerant flow between the outlet of the condenser to the nozzle of the ejector according to external refrigeration requirements.

[0019] In some embodiments, the refrigeration system further comprises:

[0020] The regenerator is connected to the outlet of the condenser and the heat exchange device respectively, and is configured to exchange heat between the refrigerant before entering the heat exchange device and the refrigerant at the outlet of the condenser.

[0021] In some embodiments, the heat exchange device comprises:

[0022] Heat exchangers are used to exchange heat with servers in data centers.

[0023] In another aspect of the present disclosure, a refrigeration device is provided, comprising:

[0024] A refrigeration system as in any of the above embodiments.

[0025] In some embodiments, the heat exchange device comprises:

[0026] A box body, used for accommodating the server;

[0027] The heat exchanger is disposed in the box and is configured to exchange heat with the server.

[0028] In another aspect of the present disclosure, a control method for a refrigeration system based on any one of the above embodiments is provided, comprising:

[0029] In response to the cooling capacity of the heat exchange device being greater than the external cooling demand, the cold storage device exchanges heat with the refrigerant from the outlet of the ejector and accumulates the cold capacity of the refrigerant from the outlet of the ejector; and

[0030] In response to the compressor being stopped, the cold storage device exchanges heat with the refrigerant from the heat exchange device and releases the stored cold.

[0031] In some embodiments, the control method further comprises:

[0032] According to the external refrigeration demand, the refrigerant flow between the outlet of the condenser to the heat exchange device and the refrigerant flow between the outlet of the condenser to the nozzle of the ejector are adjusted respectively.

[0033] Therefore, according to the embodiment of the present disclosure, by setting up an ejector, the pressure of the low-pressure working fluid can be increased, the workload and power consumption of the compressor can be reduced, and the effective utilization of energy can be achieved. The ejector and the cold storage device can also cooperate to distribute the state of the refrigerant more evenly, which helps to reduce the average heat exchange temperature difference in the heat exchange device, reduce energy loss, and improve the efficiency and performance of the refrigeration system. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The accompanying drawings, which constitute a part of the specification, illustrate embodiments of the present disclosure and, together with the description, serve to explain the principles of the present disclosure.

[0035] The present disclosure may be more clearly understood from the following detailed description with reference to the accompanying drawings, in which:

[0036] Figure 1 is a schematic diagram of the structure of some embodiments of the refrigeration system according to the present disclosure;

[0037] Figure 2 is a schematic diagram of a refrigerant cycle in a refrigeration mode according to some embodiments of the refrigeration system of the present disclosure;

[0038] Figure 3 is a schematic diagram of a refrigerant cycle in a cold storage mode according to some embodiments of the refrigeration system of the present disclosure;

[0039] Figure 4 is a schematic diagram of a refrigerant cycle in a cooling mode according to some embodiments of the refrigeration system of the present disclosure;

[0040] Figure 5 is a schematic diagram of connection relationships of some embodiments of the refrigeration system according to the present disclosure;

[0041] Figure 6 is a pressure-enthalpy diagram according to some embodiments of the refrigeration system of the present disclosure;

[0042] Figure 7 is a flow chart of some embodiments of the control method according to the present disclosure.

[0043] In the figure:

[0044] 1. Compressor; 2. Condenser; 3. Heat exchange device; 31. Heat exchanger; 32. Box; 33. Temperature and pressure sensor; 4. Ejector; 5. Cold storage device; 61. First valve; 62. Second valve; 63. Third valve; 64. Fourth valve; 65. Fifth valve; 66. Sixth valve; 67. Seventh valve; 7. Pump body; 8. Controller; 9. Regenerator; 10. Server; 11. Throttle valve.

[0045] It should be understood that the size of each part shown in the accompanying drawings is not drawn according to the actual proportional relationship. In addition, the same or similar reference numerals represent the same or similar components. DETAILED DESCRIPTION

[0046] Various exemplary embodiments of the present disclosure will now be described in detail with reference to the accompanying drawings. The description of the exemplary embodiments is merely illustrative and is in no way intended to limit the present disclosure and its application or use. The present disclosure can be implemented in many different forms and is not limited to the embodiments described herein. These embodiments are provided to make the present disclosure thorough and complete and to fully express the scope of the present disclosure to those skilled in the art. It should be noted that unless otherwise specifically stated, the relative arrangement of the components and steps, the composition of the materials, the numerical expressions and the numerical values ​​set forth in these embodiments should be interpreted as being merely exemplary and not as limiting.

[0047] The words "first", "second" and similar words used in this disclosure do not indicate any order, quantity or importance, but are only used to distinguish different parts. The words "include" or "comprise" and similar words mean that the elements before the word include the elements listed after the word, and do not exclude the possibility of including other elements. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0048] In the present disclosure, when a specific device is described as being located between a first device and a second device, there may or may not be an intermediate device between the specific device and the first device or the second device. When a specific device is described as being connected to other devices, the specific device may be directly connected to the other device without an intermediate device, or may not be directly connected to the other device but have an intermediate device.

[0049] All terms (including technical terms or scientific terms) used in the present disclosure have the same meanings as those understood by ordinary technicians in the field to which the present disclosure belongs, unless otherwise specifically defined. It should also be understood that terms defined in general dictionaries, such as general dictionaries, should be interpreted as having meanings consistent with their meanings in the context of the relevant technology, and should not be interpreted in an idealized or extremely formal sense, unless explicitly defined herein.

[0050] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered as part of the specification.

[0051] With the rapid development of information technology, the demand for heat dissipation in data centers is increasing, and traditional heat dissipation technology is gradually showing its shortcomings in high-density computing environments.

[0052] Related technologies use liquid cooling technology to dissipate heat in data centers. Liquid cooling technology has stronger heat dissipation capabilities, but the compressor power consumption in the refrigeration system of the prior art is large, resulting in large energy losses in the system.

[0053] In view of this, in one aspect of an embodiment of the present disclosure, a refrigeration system is provided, which can improve system performance.

[0054] Figure 1 is a schematic diagram of the structure of some embodiments of the refrigeration system according to the present disclosure, Figure 2 is a schematic diagram of a refrigerant cycle in a refrigeration mode according to some embodiments of the refrigeration system of the present disclosure, Figure 3 is a schematic diagram of a refrigerant cycle in a cold storage mode according to some embodiments of the refrigeration system of the present disclosure, Figure 4 is a schematic diagram of a refrigerant cycle in a cooling mode according to some embodiments of the refrigeration system of the present disclosure, with reference to Figure 1~Figure 4 The refrigeration system includes a compressor 1, a condenser 2, a heat exchange device 3, an ejector 4 and a cold storage device 5.

[0055] In the refrigeration mode of the refrigeration system, the condenser 2, the compressor 1 and the heat exchange device 3 are configured to form a refrigerant circulation loop. At this time, the ejector 4 and the cold storage device 5 are closed, and the heat exchange device 3 can cool the external equipment.

[0056] In the cooling mode, the superheated refrigerant vapor at the outlet of the compressor 1 is condensed into liquid by the condenser 2, and then enters the heat exchange device 3 after passing through the throttle valve 11, and realizes heat absorption and cooling of the external equipment at the heat exchange device 3, and then the gas phase refrigerant returns to the compressor 1. At this time, the pipe connection of the refrigeration system is as follows: Figure 2 Indicated by the thicker lines.

[0057] The nozzle of the ejector 4 is connected to the condenser 2, the ejection area of ​​the ejector 4 is connected to the heat exchange device 3, and the ejector 4 is configured to mix the refrigerant from the heat exchange device 3 and the condenser 2 and increase the pressure of the refrigerant.

[0058] The ejector 4 can utilize the high-speed liquid refrigerant from the condenser 2 to eject the gaseous refrigerant from the heat exchange device 3. The liquid refrigerant and the gaseous refrigerant are fully mixed in the mixing chamber of the ejector 4 and then enter the diffusion chamber to decelerate and increase the pressure.

[0059] The ejector 4 utilizes the energy of the high-pressure refrigerant to eject the low-pressure refrigerant, converts the pressure energy into kinetic energy and ejects the low-pressure working fluid, and then converts the kinetic energy into pressure energy to increase the pressure of the low-pressure working fluid, converts the isenthalpic throttling process into an isentropic expansion process, recovers the expansion work, and can increase the suction pressure of the compressor 1 to reduce the power consumption of the compressor 1.

[0060] The cold storage device 5 is connected to the outlet of the ejector 4 and the inlet of the compressor 1, respectively, and is configured to store the cold of the refrigerant from the outlet of the ejector 4 or release the cold. The cold storage device 5 is provided with a capacity monitoring device, and when the capacity of the cold storage device 5 reaches 95%, the system switches to the cooling mode.

[0061] The low-temperature refrigerant at the outlet of the ejector 4 enters the heat exchange tube of the cold storage device 5, absorbs the heat of the cold storage agent filled around the heat exchange tube and evaporates into gas, causing the cold storage device 5 to release heat to accumulate cold.

[0062] When the compressor 1 stops due to a fault or the electricity price is high during the day, the cold storage device 5 can cool down, and the high-temperature refrigerant flowing out of the heat exchange device 3 enters the heat exchange tube of the energy storage heat exchanger, absorbs the coldness of the cold storage agent filled around the heat exchange tube and condenses into liquid to reduce the temperature of the refrigerant.

[0063] In this embodiment, by setting up the ejector 4, the pressure of the low-pressure working fluid can be increased, the workload and power consumption of the compressor 1 can be reduced, and the effective use of energy can be achieved. The cold storage device 5 cooperates with the ejector 4 to more evenly distribute the state of the refrigerant, which helps to reduce the average heat exchange temperature difference in the heat exchange device 3, reduce energy loss, and improve the efficiency and performance of the refrigeration system.

[0064] refer to Figure 1~Figure 4 In some embodiments, the refrigeration system also has a cold storage mode and a cooling release mode. The cold storage device 5 is configured to exchange heat with the refrigerant from the outlet of the ejector 4 in the cold storage mode of the refrigeration system and allow the gaseous refrigerant to enter the compressor 1, and to exchange heat with the refrigerant from the heat exchange device 3 in the cooling release mode and reduce the temperature of the refrigerant entering the heat exchange device 3.

[0065] In the cold storage mode, the low-temperature refrigerant at the outlet of the ejector 4 enters the heat exchange tube of the cold storage device 5, absorbs the heat of the cold storage agent filled around the heat exchange tube and evaporates into gas, causing the cold storage device 5 to release heat. The cold storage device 5 converts the gas-liquid working medium at the outlet of the ejector 4 into a gas state, which can avoid liquid in the suction air of the compressor 1.

[0066] In the cooling mode, the high-temperature refrigerant flowing out of the heat exchange device 3 enters the heat exchange tubes of the energy storage heat exchanger, absorbs the cold energy of the refrigerant filling around the heat exchange tubes and condenses into liquid to reduce the temperature of the refrigerant.

[0067] In this embodiment, the cold storage device 5 can be used to separate a portion of the refrigerant as a redundant reserve when the system meets the terminal cooling demand, and is used for cooling when the system fails or shuts down. The cold storage device 5 can also prevent the compressor 1 from sucking liquid, protect the compressor 1 from liquid hammer damage, and improve the efficiency of the refrigeration cycle.

[0068] Figure 5 is a schematic diagram of the connection relationship of some embodiments of the refrigeration system according to the present disclosure, with reference to Figure 1~Figure 5 In some embodiments, the refrigeration system further includes: a first valve 61 , a second valve 62 , a pump body 7 and a controller 8 .

[0069] The first valve 61 is respectively connected to the outlet of the ejector 4, the inlet of the cold storage device 5 and the inlet of the heat exchange device 3. The second valve 62 is respectively connected to the injection area of ​​the ejector 4, the outlet of the cold storage device 5 and the outlet of the heat exchange device 3. The pump body 7 is respectively connected to the cold storage device 5 and the heat exchange device 3.

[0070] The controller 8 is connected to the first valve 61 and the second valve 62 by signal, and is configured to switch the first valve 61 and the second valve 62 on and off, so that the compressor 1, the condenser 2, the heat exchange device 3, the ejector 4 and the cold storage device 5 form a refrigerant circulation loop in the cold storage mode of the refrigeration system, and the pump body 7, the cold storage device 5 and the heat exchange device 3 form a refrigerant circulation loop in the cooling mode of the refrigeration system.

[0071] When the controller 8 switches the refrigeration system to the cold storage mode, the first valve 61 connects the outlet of the ejector 4 to the inlet of the cold storage device 5, the second valve 62 connects the injection area of ​​the ejector 4 to the outlet of the heat exchange device 3, and the pump body 7 is closed. At this time, the pipe connection of the refrigeration system is as follows: Figure 3 Indicated by the thicker lines.

[0072] In the cold storage mode, the superheated refrigerant vapor at the outlet of the compressor 1 is condensed into liquid through the condenser 2 and then divided into two fluids. One fluid passes through the throttle valve 11 and enters the heat exchange device 3 to realize heat absorption and refrigeration of the external equipment at the heat exchange device 3, and the other fluid enters the nozzle of the ejector 4 and expands into low-pressure, high-speed, wet vapor with a lower dryness.

[0073] The saturated steam at the outlet of the heat exchange device 3 is injected into the injection area of ​​the ejector 4, and is fully mixed with the refrigerant entering from the nozzle of the ejector 4 in the mixing chamber of the ejector 4, and then enters the diffusion chamber to decelerate and increase the pressure, and then enters the cold storage device 5 to achieve further heat absorption, so that the steam entering the compressor 1 is superheated saturated steam, which avoids the compressor 1 from inhaling liquid and can increase the service life of the compressor 1.

[0074] When the controller 8 switches the refrigeration system to the cooling mode, the first valve 61 connects the inlet of the cold storage device 5 with the inlet of the heat exchange device 3, the second valve 62 connects the outlet of the cold storage device 5 with the outlet of the heat exchange device 3, and the pump body 7 is turned on. At this time, the pipe connection of the refrigeration system is as follows: Figure 4 Indicated by the thicker lines.

[0075] In the cooling mode, the compressor 1, condenser 2, and ejector 4 all stop working. The refrigerant forms a cycle between the heat exchange device 3 and the cold storage device 5. After evaporating and absorbing heat in the heat exchange device 3, the refrigerant enters the cold storage device 5 to condense and release heat, and then continues to circulate to the heat exchange device 3 for refrigeration. The pump body 7 is the power device in the cooling mode. By using the cold energy in the cold storage device 5, the heat exchange device 3 can still have cold energy supply even in a short period of time after the compressor 1 stops due to a fault.

[0076] In this embodiment, the flow path of the refrigerant is adjusted by switching the first valve 61 and the second valve 62, so that the refrigeration system can flexibly switch between different modes according to external demand and / or the working condition of the compressor 1, thereby optimizing the energy configuration of the refrigeration system.

[0077] refer to Figure 1~Figure 5 In some embodiments, the refrigeration system further includes a third valve 63 and a fourth valve 64. The third valve 63 is disposed in the pipeline between the outlet of the condenser 2 and the heat exchange device 3, and is configured to adjust the refrigerant flow from the outlet of the condenser 2 to the heat exchange device 3. The fourth valve 64 is disposed in the pipeline between the outlet of the condenser 2 and the nozzle of the ejector 4, and is configured to adjust the refrigerant flow from the outlet of the condenser 2 to the nozzle of the ejector 4.

[0078] The controller 8 is connected to the third valve 63 and the fourth valve 64 by signals, and is configured to enable the third valve 63 to adjust the refrigerant flow between the outlet of the condenser 2 and the heat exchange device 3, and to enable the fourth valve 64 to adjust the refrigerant flow between the outlet of the condenser 2 and the nozzle of the ejector 4 according to external refrigeration requirements.

[0079] The third valve 63 and the fourth valve 64 can adjust the refrigerant content of the refrigeration system, and adjust the refrigerant content at the outlet of the condenser 2 directly to the ejector 4 or into the heat exchange device 3 according to the mode of the refrigeration system and the required cooling capacity of the heat exchange device 3.

[0080] When the heat exchange device 3 requires less refrigerant, more of the refrigerant after passing through the condenser 2 enters the ejector 4 through the fourth valve 64, and then enters the cold storage device 5 for storage. The other refrigerant flows to the heat exchange device 3 through the third valve 63, and is used to cool external equipment at the heat exchange device 3.

[0081] If the outlet of the heat exchange device 3 contains a small amount of gas-liquid mixture, it is converted into gas-phase refrigerant after passing through the ejector 4 and the cold storage device 5, which can prevent the compressor 1 from sucking in liquid, thereby improving the performance of the system.

[0082] When the system needs to switch to the cooling mode, the fourth valve 64 can also cut off the refrigerant supply from the outlet of the condenser 2 to the ejector 4 , so that all the refrigerant from the outlet of the condenser 2 flows to the heat exchange device 3 .

[0083] In this embodiment, the refrigerant flow distribution of the two branches at the outlet of the condenser 2 is adjusted by the third valve 63 and the fourth valve 64, so that the supply of refrigerant can be adjusted in response to changes in external demand, ensuring that the external equipment is within a suitable temperature range, thereby improving cooling efficiency and energy utilization.

[0084] refer to Figure 1~Figure 4 In some embodiments, the refrigeration system further includes a regenerator 9, which is respectively connected to the outlet of the condenser 2 and the heat exchange device 3, and is configured to exchange heat between the refrigerant before entering the heat exchange device 3 and the refrigerant at the outlet of the condenser 2.

[0085] The regenerator 9 is between the outlet of the condenser 2 and the inlet of the compressor 1. The liquid refrigerant at the outlet of the condenser 2 exchanges heat with the refrigerant before entering the heat exchange device 3, so that the temperature of the refrigerant about to enter the heat exchange device 3 is further reduced, so that the refrigerant has a greater re-cooling degree, and then enters the heat exchange device 3 after passing through the throttle valve 11 for heat exchange, which can improve the refrigeration effect of the heat exchange device 3 on the external equipment, and prevent the refrigerant from flashing unnecessarily after passing through the throttle valve 11, thereby reducing ineffective evaporation losses and improving system efficiency.

[0086] In the cold storage mode, the regenerator 9 can optimize the gas-liquid two-phase state point entering the throttle valve 11 and the gas phase state point entering the ejector 4, so that the liquid refrigerant entering the liquid cooling device is a supercooled liquid, and the refrigerant entering the ejector 4 introduction zone is superheated steam.

[0087] A fifth valve 65, a sixth valve 66 and a seventh valve 67 may also be provided in the refrigeration system so as to switch the connection relationship of the pipelines in different modes.

[0088] In this embodiment, the regenerator 9 is provided to effectively utilize the temperature difference between the refrigerants for heat exchange, so that the refrigerant entering the heat exchange device 3 is in a more suitable temperature and pressure state, which can reduce the irreversible loss caused by the isenthalpic expansion process, make the vapor compression cycle closer to the ideal reverse Carnot cycle, and improve the system refrigeration efficiency.

[0089] refer to Figure 1~Figure 4In some embodiments, the heat exchange device 3 includes a heat exchanger 31, and the heat exchanger 31 is used to exchange heat with the server 10 of the data center. The heat exchanger 31 includes but is not limited to a liquid cooling device, a water cooling device or an air cooling device.

[0090] The heat exchange device 3 may further include a temperature and pressure sensor 33 and a box 32 . The temperature and pressure sensor 33 and the heat exchanger 31 are disposed in the box 32 . The server 10 may be disposed in the box 32 so that the heat exchanger 31 exchanges heat with the server 10 .

[0091] The temperature of the server 10 rises, and the heat is transferred to the coolant in the heat exchanger 31. The coolant is heated and vaporized in a constant volume environment. The vapor rises to the top of the box 32 and exchanges heat with the refrigerant in the heat exchanger 31. The vapor is cooled and liquefied and returns to the bottom of the box 32. The temperature of the refrigerant rises after the heat exchange with the coolant, and circulates to the condenser 2 to release heat.

[0092] In this embodiment, the refrigeration system coupled to the ejector 4 combines the advantages of ejector cooling and liquid cooling technology, which can reduce the irreversible loss caused by the isenthalpic expansion process, make the vapor compression cycle closer to the ideal reverse Carnot cycle, and enable the heat exchange device 3 to provide a more reliable heat dissipation solution for high-density computing environments.

[0093] Figure 6 is a pressure-enthalpy diagram according to some embodiments of the refrigeration system of the present disclosure, Figure 6 a, b, c, c', d, e, e', f, g, h, i and Figure 3 a, b, c, e', d, e, e', f, g, h, and i correspond to each other.

[0094] From a to b, the compressor 1 compresses the low-pressure superheated steam into high-pressure superheated steam, from b to c, the condenser 2 cools the high-pressure superheated steam into high-pressure saturated steam, from c to c', the reheater 9 further cools the refrigerant into a high-pressure saturated liquid state, from c' to d, the refrigerant passes through the throttle valve 11 from the high-pressure saturated liquid state to the low-pressure subcooled liquid state, from d to e, the refrigerant absorbs heat and evaporates from the low-pressure subcooled liquid state to the low-pressure superheated steam state in the heat exchange device 3, and from e to e', the reheater 9 heats the refrigerant in the low-pressure superheated steam state to the superheated steam state.

[0095] From e' to g, the ejector 4 injects the saturated steam from the outlet of the heat exchange device 3 into the injection area of ​​the ejector 4; from c to f, the refrigerant from the outlet of the condenser 2 enters the nozzle of the ejector 4 and expands into low-pressure, high-speed, wet steam with a lower dryness; from h to i, the refrigerant is fully mixed in the mixing chamber of the ejector 4 and then enters the diffusion chamber for deceleration and pressure increase; from i to a, the cold storage device 5 realizes further heat absorption, so that the steam entering the compressor 1 is superheated saturated steam.

[0096] refer to Figure 1~Figure 4In another aspect of the embodiments of the present disclosure, a refrigeration device is provided, comprising a refrigeration system as in any of the above embodiments.

[0097] In this embodiment, the refrigeration system combines the advantages of jet cooling and liquid cooling technology, has high heat dissipation capacity and energy saving capability, and can provide a more reliable heat dissipation solution for high-density computing environments.

[0098] In some embodiments, the heat exchange device 3 includes a box 32 and a heat exchanger 31. The box 32 is used to accommodate the server 10, and the heat exchanger 31 is disposed in the box 32 and is configured to exchange heat with the server 10. The heat exchanger 31 is disposed in the box 32, and the server 10 can be disposed in the box 32 so that the heat exchanger 31 exchanges heat with the server 10.

[0099] The temperature of the server 10 rises, and the heat is transferred to the coolant in the heat exchanger 31. The coolant is heated and vaporized in a constant volume environment. The vapor rises to the top of the box 32 and exchanges heat with the refrigerant in the heat exchanger 31. The vapor is cooled and liquefied and returns to the bottom of the box 32. The temperature of the refrigerant rises after the heat exchange with the coolant, and circulates to the condenser 2 to release heat.

[0100] In this embodiment, the refrigeration equipment can reduce the irreversible loss caused by the isenthalpic expansion process, making the vapor compression cycle closer to the ideal reverse Carnot cycle, so that the refrigeration equipment can meet the increasing heat dissipation needs of the data center.

[0101] Figure 7 is a flowchart of some embodiments of the control method of the present disclosure, referring to Figure 7 In another aspect of the embodiments of the present disclosure, a control method for a refrigeration system based on any of the above embodiments is provided, including: step S1 and step S2.

[0102] In step S1 , in response to the cooling capacity of the heat exchange device 3 being greater than the external cooling demand, the cold storage device 5 exchanges heat with the refrigerant from the outlet of the ejector 4 and accumulates the cold capacity of the refrigerant from the outlet of the ejector 4 .

[0103] In step S2 , in response to the compressor 1 being stopped, the cold storage device 5 exchanges heat with the refrigerant from the heat exchange device 3 and releases the stored cold.

[0104] When the cooling capacity of the heat exchange device 3 is greater than the external cooling demand, it can be switched to the cold storage mode so that the cold storage device 5 can store the excess refrigerant of the system. In the cold storage mode, the low-temperature refrigerant at the outlet of the ejector 4 enters the heat exchange tube of the cold storage device 5, absorbs the heat of the refrigerant filled around the heat exchange tube and evaporates into gas, so that the cold storage device 5 releases heat. The cold storage device 5 converts the gas-liquid working medium at the outlet of the ejector 4 into a gas state, which can avoid the suction of the compressor 1 with liquid.

[0105] When the compressor 1 stops or the electricity price is high during the day, it can be switched to the cooling mode to release the cold stored in the cold storage device 5 to ensure the stable operation and energy saving of the system. In the cooling mode, the high-temperature refrigerant flowing out of the heat exchange device 3 enters the heat exchange tube of the energy storage heat exchanger, absorbs the cold of the cold storage filled around the heat exchange tube and condenses into liquid to reduce the temperature of the refrigerant.

[0106] In this embodiment, when the system meets the terminal cooling demand, a portion of the refrigerant can be allocated as a redundant reserve for cooling when the system fails or shuts down. When the compressor 1 fails or the electricity rate is high, the cold stored in the cold storage device 5 can be released, which can improve the efficiency of the refrigeration system and ensure the stable operation and energy-saving capabilities of the system.

[0107] refer to Figure 7 In some embodiments, the control method further includes step S3. In step S3, the refrigerant flow between the outlet of the condenser 2 and the heat exchange device 3 and the refrigerant flow between the outlet of the condenser 2 and the nozzle of the ejector 4 are adjusted respectively according to the external cooling demand.

[0108] In this embodiment, by adjusting the flow rate of the refrigerant, the refrigeration system can flexibly switch between different modes according to external demand and / or the working condition of the compressor 1, thereby optimizing the energy configuration of the refrigeration system.

[0109] So far, various embodiments of the present disclosure have been described in detail. In order to avoid obscuring the concept of the present disclosure, some details known in the art are not described. Based on the above description, those skilled in the art can fully understand how to implement the technical solution disclosed here.

[0110] Although some specific embodiments of the present disclosure have been described in detail by way of examples, it should be understood by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the present disclosure. It should be understood by those skilled in the art that the above embodiments may be modified or some technical features may be replaced by equivalents without departing from the scope and spirit of the present disclosure. The scope of the present disclosure is defined by the appended claims.

Claims

1. A refrigeration system, characterized in that: include: A compressor (1), a condenser (2) and a heat exchange device (3), wherein in a refrigeration mode of the refrigeration system, the condenser (2), the compressor (1) and the heat exchange device (3) are configured to form a refrigerant circulation loop; An ejector (4), a nozzle of the ejector (4) being connected to the condenser (2), an ejection zone of the ejector (4) being connected to the heat exchange device (3), and the ejector (4) being configured to mix the refrigerant from the heat exchange device (3) and the condenser (2) and to increase the pressure of the refrigerant; and The cold storage device (5) is connected to the outlet of the ejector (4) and the inlet of the compressor (1), respectively, and is configured to store cold energy or release cold energy of the refrigerant from the outlet of the ejector (4).

2. The refrigeration system according to claim 1, characterized in that: The refrigeration system also has a cold storage mode and a cold release mode. The cold storage device (5) is configured to exchange heat with the refrigerant from the outlet of the ejector (4) in the cold storage mode of the refrigeration system and allow the gaseous refrigerant to enter the compressor (1), and to exchange heat with the refrigerant from the heat exchange device (3) in the cold release mode and reduce the temperature of the refrigerant entering the heat exchange device (3).

3. The refrigeration system according to claim 2, characterized in that: Also includes: A first valve (61) is respectively connected to the outlet of the ejector (4), the inlet of the cold storage device (5), and the inlet of the heat exchange device (3); A second valve (62) is connected to the injection area of ​​the ejector (4), the outlet of the cold storage device (5) and the outlet of the heat exchange device (3) respectively; A pump body (7) connected to the cold storage device (5) and the heat exchange device (3) respectively; and A controller (8) is connected to the first valve (61) and the second valve (62) by signals, and is configured to switch the first valve (61) and the second valve (62) on and off, so that the compressor (1), the condenser (2), the heat exchange device (3), the ejector (4) and the cold storage device (5) form a refrigerant circulation loop in a cold storage mode of the refrigeration system, and so that the pump body (7), the cold storage device (5) and the heat exchange device (3) form a refrigerant circulation loop in a cold release mode of the refrigeration system.

4. The refrigeration system according to claim 3, characterized in that: Also includes: a third valve (63), arranged in a pipeline between the outlet of the condenser (2) and the heat exchange device (3), configured to adjust the refrigerant flow between the outlet of the condenser (2) and the heat exchange device (3); and a fourth valve (64), arranged in a pipeline between the outlet of the condenser (2) and the nozzle of the ejector (4), and configured to adjust the refrigerant flow between the outlet of the condenser (2) and the nozzle of the ejector (4); The controller (8) is connected to the third valve (63) and the fourth valve (64) by signals, and is configured to enable the third valve (63) to adjust the refrigerant flow between the outlet of the condenser (2) and the heat exchange device (3), and to enable the fourth valve (64) to adjust the refrigerant flow between the outlet of the condenser (2) and the nozzle of the ejector (4) according to external refrigeration requirements.

5. The refrigeration system according to any one of claims 1 to 4, characterized in that: Also includes: The regenerator (9) is connected to the outlet of the condenser (2) and the heat exchange device (3) respectively, and is configured to exchange heat between the refrigerant before entering the heat exchange device (3) and the refrigerant at the outlet of the condenser (2).

6. The refrigeration system according to claim 1, characterized in that: The heat exchange device (3) comprises: The heat exchanger (31) is used for exchanging heat with a server (10) in a data center.

7. A refrigeration device, characterized in that: include: A refrigeration system as claimed in any one of claims 1 to 6.

8. The refrigeration device according to claim 7, characterized in that: The heat exchange device (3) comprises: A box (32) for accommodating the server (10); The heat exchanger (31) is disposed in the box (32) and is configured to exchange heat with the server (10).

9. A control method for a refrigeration system according to any one of claims 1 to 6, characterized in that: include: In response to the cooling capacity of the heat exchange device (3) being greater than the external cooling demand, the cold storage device (5) exchanges heat with the refrigerant from the outlet of the ejector (4) and accumulates the cold capacity of the refrigerant from the outlet of the ejector (4); as well as In response to the compressor (1) being shut down, the cold storage device (5) exchanges heat with the refrigerant from the heat exchange device (3) and releases the stored cold.

10. The control method according to claim 9, characterized in that: Also includes: According to external refrigeration requirements, the refrigerant flow rate between the outlet of the condenser (2) and the heat exchange device (3) and the refrigerant flow rate between the outlet of the condenser (2) and the nozzle of the ejector (4) are adjusted respectively.

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