Double-loop cooling system

Abstract

The utility model relates to a two-circuit cooling system. The first condenser and the second condenser are connected in series, and the condensation temperature difference between the first condenser and the second condenser is formed by means of the first fluid. And the first evaporator and the second evaporator are connected in series through the evaporator water tank, and the evaporation temperature difference of the first evaporator and the second evaporator is formed by means of the second fluid. And finally, by controlling the flow directions of the first fluid and the second fluid, the first fluid and the second fluid oppositely flow reversely, so that the evaporator and the condenser with relatively high evaporation temperature and condensation temperature are located in the same loop, and the evaporator and the condenser with relatively low evaporation temperature and condensation temperature are located in the same loop. The compression ratio of the first compressor and the second compressor is reduced, so that the energy consumption of the cooling system is reduced, and the operation efficiency of the cooling system is improved.

Description

Technical Field

[0001] This application relates to the field of air-cooling control technology, and particularly to a dual-loop cooling system. Background Art

[0002] In recent years, data centers have developed rapidly in China, and the energy consumption problem has become increasingly prominent. A data center is a building site that provides an operating environment for centrally placed electronic information equipment, and consists of a large number of energy-consuming equipment such as IT equipment, refrigeration equipment, power supply and distribution equipment, and other infrastructure such as lighting and security. Data centers are big energy consumers.

[0003] The indicator for measuring the energy consumption of a data center is the Power Usage Effectiveness (PUE). The average PUE value of a data center below 1.2 is the normal standard, but the PUE values of most data centers in China are greater than 2.0, and the average value is as high as 2.5. Therefore, how to reduce the energy consumption of the refrigeration equipment in the data center and improve the operating efficiency of the refrigeration equipment has become an urgent problem to be solved. Summary of the Invention

[0004] This application provides a dual-loop cooling system, which can solve the problems of high energy consumption and low efficiency of existing refrigeration equipment. The technical solution is as follows:

[0005] A dual-loop cooling system, comprising:

[0006] A first refrigeration loop, the first refrigeration loop includes a first compressor, a first expansion device, a first condenser, and a first evaporator. The exhaust side of the first compressor is connected to one port of the first condenser, the other port of the first condenser is connected to one port of the first evaporator through the first expansion device, and the other end of the first evaporator is connected to the suction side of the first compressor;

[0007] A second refrigeration loop, the second refrigeration loop includes a second compressor, a second expansion device, a second condenser, and a second evaporator; the exhaust side of the second compressor is connected to one port of the second condenser, the other port of the second condenser is connected to one port of the second evaporator through the second expansion device, and the other end of the second evaporator is connected to the suction side of the second compressor;

[0008] The first condenser and the second condenser are interconnected in series so that a first fluid continuously passes through the first condenser and the second condenser;

[0009] An evaporator water tank, the first evaporator and the second evaporator are interconnected in series through the evaporator water tank so that a second fluid continuously passes through the first evaporator and the second evaporator; wherein

[0010] The flowing order of the first fluid and the second fluid through the first refrigeration circuit and the second refrigeration circuit is opposite.

[0011] In one embodiment, the evaporation temperature of the first evaporator is less than the evaporation temperature of the second evaporator, and the condensation temperature of the first condenser is less than the condensation temperature of the second condenser; or

[0012] The temperature of the first evaporator is greater than that of the second evaporator, and the temperature of the first condenser is greater than the condensation temperature of the second condenser.

[0013] In one embodiment, the first compressor and the second compressor are configured as one of a screw compressor, a centrifugal compressor, a piston compressor, a scroll compressor, and a rotary compressor.

[0014] In one embodiment, the first refrigeration circuit further includes a first oil separator, and two ports of the first oil separator are respectively communicated with the first compressor and the first condenser;

[0015] The second refrigeration circuit further includes a second oil separator, and two ports of the second oil separator are respectively communicated with the second compressor and the second condenser.

[0016] In one embodiment, the first compressor and the second compressor in the first refrigeration circuit and the second refrigeration circuit can be set to be one or more, and the compression capacities of the first compressor and the second compressor are the same.

[0017] In one embodiment, both the first evaporator and the second evaporator are configured as flooded evaporators.

[0018] In one embodiment, a partition assembly is arranged in the evaporator water tank to realize the series connection between the first evaporator and the second evaporator, where

[0019] The partition assembly includes a main board provided with a flow hole, a first baffle, and a second baffle. The first baffle and the second baffle are respectively vertically arranged on both sides of the main board, and the flow hole is located between the first baffle and the second baffle.

[0020] In one embodiment, the main board is configured as a rectangle, and the first baffle and the second baffle are configured as semi - circles.

[0021] In one embodiment, the first condenser and the second condenser are configured as one of a fin - tube condenser and a micro - channel condenser.

[0022] In one embodiment, the first expansion device and the second expansion device can be configured as one of an electronic expansion valve and a thermostatic expansion valve

[0023] The technical solutions provided by the embodiments of the present application may include the following beneficial effects: As can be seen from the above embodiments, the present application uses a series connection method for the first condenser and the second condenser, with the aid of the first fluid to form a condensation temperature difference between the first condenser and the second condenser, and then interconnects the first evaporator and the second evaporator in series through the evaporation water tank, with the aid of the second fluid to form an evaporation temperature difference between the first evaporator and the second evaporator. Finally, by controlling the flow directions of the first fluid and the second fluid to make them flow countercurrently relative to each other, so that the evaporator and the condenser with relatively high evaporation temperature and condensation temperature are in the same circuit, and the evaporator and the condenser with relatively low evaporation temperature and condensation temperature are in the same circuit, so as to reduce the compression ratios of the first compressor and the second compressor, thereby reducing the energy consumption of the cooling system and improving the operating efficiency of the cooling system.

[0024] It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and cannot limit the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0026] Figure 1 It is a schematic diagram of the principle of a dual-circuit cooling system according to an embodiment of the present application.

[0027] Figure 2 It is a schematic diagram of the layout of the evaporator water tank according to an embodiment of the present application.

[0028] Figure 3 It is a schematic diagram of the structure of the partition assembly according to an embodiment of the present application.

[0029] Figure 4 It is another schematic diagram of the structure of the partition assembly according to an embodiment of the present application.

[0030] Figure 5 It is another schematic diagram of the layout of the evaporator water tank according to an embodiment of the present application.

[0031] Description of the reference numerals:

[0032] 10. First refrigeration circuit; 101. First compressor; 102. First expansion device; 103. First condenser; 104. First evaporator; 20. Second refrigeration circuit; 201. Second compressor; 202. Second expansion device; 203. Second condenser; 204. Second evaporator; 30. Evaporator water tank; 301. Main board; 3010. Flow-through hole; 302. First baffle; 303. Second baffle; 304. Water inlet; 305. Water outlet. Detailed implementation manners

[0033] Here, the exemplary embodiments will be described in detail, and the examples are shown in the drawings. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The manners described in the following exemplary embodiments do not represent all manners consistent with the present application. On the contrary, they are merely examples of devices consistent with some aspects of the present application as detailed in the appended claims.

[0034] Refer to Figures 1 to 2 , the present application provides a dual-circuit cooling system. It includes a first refrigeration circuit 10, a second refrigeration circuit 20, and an evaporator water tank 30.

[0035] The first refrigeration circuit 10 includes a first compressor 101, a first expansion device 102, a first condenser 103, and a first evaporator 104. The exhaust side of the first compressor 101 is connected to one port of the first condenser 103, the other port of the first condenser 103 is connected to one port of the first evaporator 104 through the first expansion device 102, and the other end of the first evaporator 104 is connected to the suction side of the first compressor 101. The second refrigeration circuit 20 includes a second compressor 201, a second expansion device 202, a second condenser 203, and a second evaporator 204. The exhaust side of the second compressor 201 is connected to one port of the second condenser 203, the other port of the second condenser 203 is connected to one port of the second evaporator 204 through the second expansion device 202, and the other end of the second evaporator 204 is connected to the suction side of the second compressor 201. Among them, the first condenser 103 and the second condenser 203 are interconnected in series so that the first fluid continuously passes through the first condenser 103 and the second condenser 203. The first evaporator 104 and the second evaporator 204 are interconnected in series through the evaporator water tank 30 so that the second fluid continuously passes through the first evaporator 104 and the second evaporator 204. The first fluid and the second fluid flow through the first refrigeration circuit and the second refrigeration circuit in opposite orders.

[0036] In this embodiment, the first compressor 101, the first evaporator 104, the first condenser 103, and the first expansion device 102 in the first refrigeration circuit 10 operate in a series flow relationship in a well-known manner. The second compressor 201, the second evaporator 204, the second condenser 203, and the second expansion device 202 in the second refrigeration circuit 20 are also connected in a series flow relationship and operate in a well-known manner.

[0037] In some embodiments, the number of the first compressor 101 in the first refrigeration circuit 10 and the second compressor 201 in the second refrigeration circuit can be set to one or more. However, it is necessary to ensure that the sum of the compression capacities of the first refrigeration circuit 10 and the second refrigeration circuit 20 is the same.

[0038] In some embodiments, the total exhaust pipes of several compressors in the first refrigeration circuit 10 and the second refrigeration circuit 20 can be divided into multiple paths, where the number of compressor branch pipes is the same as the number of fins of the coil.

[0039] Continue to refer to Figure 1 and Figure 2 , an evaporator water tank 30 is added at the middle position between the first evaporator 104 and the second evaporator 204 in this application. The pipe of the first evaporator 104 is fluidly connected to one side of the evaporator water tank 30, and the pipe of the second evaporator 204 is fluidly connected to the other side of the evaporator water tank 30. Therefore, when the second fluid (generally water, and water will refer to the second fluid in the following content) passes through the middle of the first refrigeration circuit 10 and the second refrigeration circuit 20, the evaporator water tank 30 serves as an intermediate container for water.

[0040] According to common sense, for the first evaporator into which the cooling water to be cooled first enters, since its water temperature is relatively high, the evaporation temperature of the evaporator is high, and the refrigeration circuit where the evaporator is located can be called a high-temperature evaporation circuit. Then for the other evaporator into which the cooling water enters, since part of its heat is transferred to the pipe of the previous evaporator, the water temperature decreases, and the evaporation temperature of the other evaporator is relatively low, and the refrigeration circuit where it is located can be called a low-temperature evaporation circuit. Then it means that controlling the flow direction of the cooling water can determine whether the refrigeration circuits where the first evaporator 104 and the second evaporator 204 are located are high-temperature evaporation circuits or low-temperature evaporation circuits.

[0041] Meanwhile, the first condenser 103 and the second condenser 203 are connected in series in a flowing-through manner. It should be particularly noted that the first fluid in this application refers to the air flow. Therefore, for the condenser that the air flow first enters, since the temperature of the air flow is generally at room temperature and the condensation temperature of the condenser is relatively low, the refrigeration circuit where it is located can be called a low-temperature condensation circuit. Then the air flow flows into the other condenser. Since the air flow absorbs the heat of the refrigerant in the previous condenser when flowing through it, the temperature of the air flow rises, and the condensation temperature of the other condenser is relatively high, so the refrigeration circuit where it is located can be called a high-temperature evaporation circuit. Then it means that controlling the flow direction of the air flow can determine whether the refrigeration circuits where the first condenser 103 and the second condenser 203 are located are high-temperature condensation circuits or low-temperature condensation circuits.

[0042] In this application, by controlling the air flow and the water to be cooled so that their flow directions are opposite, it is possible to make the low-temperature evaporation circuit and the low-temperature condensation circuit, as well as the high-temperature evaporation circuit and the high-temperature condensation circuit, be in the same refrigeration circuit, which can reduce the compression ratios of the first compressor 101 and the second compressor 201, and further reduce the energy consumption of the cooling system and improve the operating efficiency of the cooling system.

[0043] In some embodiments, both the first evaporator 104 and the second evaporator 204 are configured as flooded evaporators. The evaporator water tank 30 has a water inlet 304 and a water outlet 305, and is connected in a flowing-through manner between the inlet end and the outlet end of the pipeline of the first evaporator 104 and the inlet end and the outlet end of the pipeline of the second evaporator 204.

[0044] The evaporator water tank 30 can be set to a single-loop mode and a double-loop mode.

[0045] Refer to Figures 2 to 4 , in order to implement the double-loop mode of the evaporator water tank 30, this application adds a partition component in the evaporator water tank 30, and the partition component can greatly modify the path of the cooling water entering and leaving the evaporator water tank 30.

[0046] Continue to refer to Figure 4 , the partition component includes a main board 301 provided with a flow hole 3010, a first baffle 302 and a second baffle 303. The first baffle 302 and the second baffle 303 are respectively vertically arranged on both sides of the main board 301, and the flow hole 3010 is located between the first baffle 302 and the second baffle 303. The settings of the main board 301, the first baffle 302 and the second baffle 303 can divide the interior of the evaporator water tank 30 into three channels, one of which is communicated with the water inlet 304, another is communicated with the water outlet 305, and the other is communicated with the pipelines of the first evaporator 104 and the second evaporator 204.

[0047] This kind of setting can not only achieve the series connection between the first refrigeration circuit 10 and the second refrigeration circuit 20 in the physical structure, so that by controlling the order of the water to be cooled flowing through the two refrigeration circuits, the countercurrent of the water to be cooled and the air can be realized. At the same time, the design of the partition component makes the order of the water to be cooled entering the upper and lower parts of the first evaporator 104 pipeline the same as the order of entering the upper and lower parts of the second evaporator 204 pipeline. Combined with the flowing direction of the refrigerant outside the pipeline, the heat exchange efficiency of the evaporation circuit (i.e., the low-temperature evaporation circuit and the high-temperature evaporation circuit) can be effectively improved. Finally, the partition component has a simple structure and can greatly reduce the production cost of the water tank.

[0048] In some embodiments, the main board 301 is configured as a rectangle, and the first baffle 302 and the second baffle 303 are configured as semi-circles.

[0049] Referring to Figure 3 , the bottom edge of the first baffle 302 is fixed on one side of the main board 301 after being as close as possible to one edge of the circulation hole 3010, and the bottom edge of the second baffle 303 is fixed on the other side of the main board 301 after being as close as possible to the opposite edge of the circulation hole 3010.

[0050] In some embodiments, the evaporation temperature of the first evaporator 104 is less than the evaporation temperature of the second evaporator 204, and the condensation temperature of the first condenser 103 is less than the condensation temperature of the second condenser 203.

[0051] Referring to Figure 1 and Figure 2 , in this embodiment, the evaporator water tank 30 is arranged in a way that water enters from the bottom and exits from the top. That is, the water inlet 304 is arranged below the evaporator water tank 30 and close to the second evaporator 204, and the water outlet 305 is arranged above the evaporator water tank 30 and close to the first evaporator 104.

[0052] The flowing direction of the water to be cooled is: the water inlet 304 of the evaporator water tank 30 → the lower pipeline of the second evaporator 204 → the upper pipeline of the second evaporator 204 → the evaporator water tank 30 (through the circulation hole 3010 of the main board 301) → the lower pipeline of the first evaporator 104 → the upper pipeline of the second evaporator 204 → the water outlet 305 of the evaporator water tank 30.

[0053] The flowing direction of the air: the first condenser 103 → the second condenser 203.

[0054] As can be seen from the above, the water to be cooled first flows through the second evaporator 204 and then through the first evaporator 104, making the first refrigeration circuit 10 a low-temperature evaporation circuit and the second refrigeration circuit 20 a high-temperature evaporation circuit. The air first flows through the first condenser 103 and then through the second condenser 203, making the first refrigeration circuit 10 a low-temperature condensation circuit and the second refrigeration circuit 20 a high-temperature condensation circuit.

[0055] Let the cooling water flow countercurrently to the air, so that the low-temperature evaporation circuit and the low-temperature condensation circuit are both in the first refrigeration circuit 10, and the high-temperature evaporation circuit and the high-temperature condensation circuit are both in the second refrigeration circuit 20. This arrangement can reduce the temperature difference between condensation and evaporation in the circuit, thereby reducing the compression ratio of the compressor in the circuit, so as to achieve the purpose of reducing energy consumption and improving efficiency.

[0056] Specifically, a simulation is carried out according to a flow rate of 3 kg / s and a subcooling degree of 10 K without considering other power consumptions. Table 1 below shows the simulation data of the existing unit and the dual-loop cooling system of the present application:

[0057]

[0058] It should be noted that COP (Coefficient Of Performance) is the ratio of energy conversion efficiency. The larger the COP, the more electric energy is saved. In a refrigeration system, the conversion ratio between the generated cooling capacity and the consumed energy is the COP, also known as the coefficient of refrigeration. As can be seen from the above table, the technical solution of the present application can increase the efficiency of the compressor by nearly 10%.

[0059] In some embodiments, the temperature of the first evaporator 104 is higher than that of the second evaporator 204, and the temperature of the first condenser 103 is higher than the condensation temperature of the second condenser 203. In this embodiment, by changing the positions of the water inlet 304 and the water outlet 305 of the evaporator water tank 30, the flow direction sequence of the cooling water and the air can be changed. Also, due to the different flow direction sequences, the first refrigeration circuit 10 becomes a high-temperature circuit (including a high-temperature evaporation circuit and a high-temperature condensation circuit), and the second refrigeration circuit 20 becomes a low-temperature circuit (including a low-temperature evaporation circuit and a low-temperature condensation circuit). Other contents can refer to the above embodiments and will not be elaborated here.

[0060] In some embodiments, the evaporator water tank 30 is set in a single-loop mode. In this mode, the water inlet 304 and the water outlet 305 are arranged at both ends of the evaporator water tank. The pipes of the first evaporator 104 and the second evaporator 204 can be set as an integral part extending across the first refrigeration circuit and the second refrigeration circuit, and the cooling water can continuously flow from the water inlet 304 to the water outlet 305.

[0061] Refer to Figure 5, It should be noted that the dotted lines in the figure represent the flow paths of the cooling water to be cooled. When air flows from the first condenser 103 to the second condenser 203, the water inlet 304 is set near the second evaporator 204, and the water outlet 305 is set at the first evaporator 104. When the cooling water to be cooled flows from the water inlet 304 to the water outlet 305, it first passes through the second evaporator 204 and then through the first evaporator 104. By setting it in this way, countercurrent of the cooling water to be cooled and air can be achieved, that is, the sequence of their flow through the first refrigeration circuit and the second refrigeration circuit is opposite, and thus the low-temperature evaporation circuit and the low-temperature condensation circuit, as well as the high-temperature evaporation circuit and the high-temperature condensation circuit, can be in the same refrigeration circuit, which can reduce the compression ratios of the first compressor 101 and the second compressor 201, and further reduce the energy consumption of the cooling system and improve the operating efficiency of the cooling system.

[0062] On the contrary, when air flows from the second condenser 203 to the first condenser 103, the water inlet 304 is set near the first evaporator 104, and the water outlet 305 is set at the second evaporator 204, then countercurrent between the air and the cooling water to be cooled can be achieved, thereby reducing energy consumption and improving operating efficiency.

[0063] In some embodiments, the suction main pipes of the compressors in each circuit are connected to the corresponding evaporators, and the starting sequence is: start the low-temperature circuit first, and then start the high-temperature circuit. The unloading sequence is: unload the high-temperature circuit first, and then unload the low-temperature circuit.

[0064] In some embodiments, the first compressor 101 and the second compressor 201 are configured as one of a screw compressor, a centrifugal compressor, a piston compressor, a scroll compressor, and a rotor compressor.

[0065] Specifically, when the first compressor 101 and the second compressor 201 are configured as a screw compressor and some models of centrifugal compressors, the first refrigeration circuit 10 is provided with a first oil separator, and both ends of the first oil separator are respectively communicated with the first compressor 101 and the first condenser 103. The second refrigeration circuit 20 is provided with a second oil separator, and both ends of the second oil separator are respectively communicated with the second compressor 201 and the second condenser 203.

[0066] Furthermore, the first oil separator and the second oil separator can be configured as external oil separators. The external oil separator has high oil separation efficiency.

[0067] In some embodiments, both the first condenser 103 and the second condenser 203 include multiple condenser tube sheets and cooling fans. The condenser tube sheets include an air inlet side and an air outlet side arranged in one direction, and the cooling fans are used to make ambient air flow through the air inlet side and the air outlet side for heat exchange of the condenser tube sheets. Multiple sets of collecting pipe groups are arranged on the periphery of the condenser tube sheets.

[0068] Multiple groups of condenser tubes are arranged inside the condenser fin. The multiple groups of condenser tubes are connected to the multiple groups of collecting tubes in a one-to-one correspondence to form multiple mutually isolated condensation circuits, and one of the condensation circuits is arranged closer to the air inlet side than the other condensation circuits.

[0069] This setting can make the air volume of the cooling fan all pass through the coils of the multiple condensation circuits, so as to reduce the average saturation temperature of the multiple condensation circuits and achieve an improvement in heat exchange energy efficiency.

[0070] In some embodiments, the first condenser 103 and the second condenser 203 are configured as one of a finned tube condenser and a microchannel condenser.

[0071] In some embodiments, the first expansion device 102 and the second expansion device 202 can be configured as one of an electronic expansion valve and a thermal expansion valve.

[0072] The terms used in this application are only for the purpose of describing specific embodiments and are not intended to limit this application. Unless otherwise defined, the technical terms or scientific terms used in this application should have the ordinary meaning understood by those of ordinary skill in the art to which this application belongs. The "first", "second" and similar terms used in the specification and claims of this application do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, words such as "a" or "one" do not indicate a quantity limitation, but indicate that there is at least one, and will be separately stated if only referring to "one". "Multiple" or "several" means two or more. Unless otherwise indicated, similar terms such as "front part", "rear part", "lower part" and / or "upper part" are only for convenience of description and are not limited to one position or a spatial orientation. Words such as "including" or "comprising" mean that the elements or objects appearing before "including" or "comprising" cover the elements or objects listed after "including" or "comprising" and their equivalents, and do not exclude other elements or objects. "Connection" or "coupling" and similar terms are not limited to physical or mechanical connections, and may include electrical connections, whether direct or indirect. The singular forms of "a", "the" and "said" used in the specification and appended claims of this application are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term "and / or" used herein refers to and includes any or all possible combinations of one or more of the associated listed items.

[0073] The specific embodiments described herein are only illustrative of the spirit of this application. Those skilled in the art to which this application belongs can make various modifications, supplements, or use similar methods to replace the specific embodiments described, but will not deviate from the spirit of this application or exceed the scope defined by the appended claims.

[0074] The technical features of the above embodiments can be combined arbitrarily. For the sake of concise description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope recorded in this specification.

Claims

1. A dual-circuit cooling system, characterized in that: include: a first refrigeration circuit, the first refrigeration circuit comprising a first compressor, a first expansion device, a first condenser and a first evaporator, the exhaust side of the first compressor being connected to a port of the first condenser, the other port of the first condenser being connected to a port of the first evaporator through the first expansion device, and the other end of the first evaporator being connected to a suction side of the first compressor; a second refrigeration circuit, the second refrigeration circuit comprising a second compressor, a second expansion device, a second condenser and a second evaporator; an exhaust side of the second compressor is connected to a port of the second condenser, another port of the second condenser is connected to a port of the second evaporator through the second expansion device, and the other end of the second evaporator is connected to a suction side of the second compressor; the first condenser and the second condenser are interconnected in a series relationship such that the first fluid passes through the first condenser and the second condenser in series; an evaporator water tank, wherein the first evaporator and the second evaporator are interconnected in series through the evaporator water tank so that the second fluid continuously passes through the first evaporator and the second evaporator; a baffle assembly is arranged in the evaporator water tank, wherein the baffle assembly comprises a main board with a flow hole, a first baffle and a second baffle, the first baffle and the second baffle are respectively arranged vertically on both sides of the main board, and the flow hole is located between the first baffle and the second baffle; The first fluid and the second fluid flow through the first refrigeration circuit and the second refrigeration circuit in an opposite order.

2. The dual-circuit cooling system according to claim 1, characterized in that: The evaporation temperature of the first evaporator is lower than the evaporation temperature of the second evaporator, and the condensation temperature of the first condenser is lower than the condensation temperature of the second condenser; or The temperature of the first evaporator is higher than that of the second evaporator, and the temperature of the first condenser is higher than that of the second condenser.

3. The dual-circuit cooling system according to claim 1, characterized in that: The first compressor and the second compressor are configured as one of a screw compressor, a centrifugal compressor, a piston compressor, a scroll compressor, and a rotor compressor.

4. The dual-circuit cooling system according to claim 1, characterized in that: The first refrigeration circuit further includes a first oil separator, two ports of the first oil separator are respectively connected to the first compressor and the first condenser; The second refrigeration circuit further includes a second oil separator, and two ports of the second oil separator are respectively connected to the second compressor and the second condenser.

5. The dual-circuit cooling system according to any one of claims 2 to 4, characterized in that: The first compressor and the second compressor in the first refrigeration circuit and the second refrigeration circuit may be provided in one or more units, and the compression capacities of the first compressor and the second compressor are the same.

6. The dual-circuit cooling system according to claim 2, characterized in that: The first evaporator and the second evaporator are both configured as flooded evaporators.

7. The dual-circuit cooling system according to claim 1, characterized in that: The main board is configured in a rectangular shape, and the first baffle plate and the second baffle plate are configured in a semicircular shape.

8. The dual-circuit cooling system according to claim 1, characterized in that: The first condenser and the second condenser are configured as one of a tube-fin condenser and a microchannel condenser.

9. The dual-circuit cooling system according to claim 1, characterized in that: The first expansion device and the second expansion device may be configured as one of an electronic expansion valve and a thermal expansion valve.

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