Machine room thermal management system with double circulation and control method thereof

Abstract

The invention discloses a machine room thermal management system with double circulation, which comprises a first power module, a second power module and a control module, the first power module comprises an air flotation centrifugal compressor, and the second power module is arranged in parallel with the first power module and comprises a pump and a one-way valve. The control module is used for selecting the power module according to the difference value between the external environment temperature and the machine room internal temperature. Different power modules are selected according to the indoor and outdoor temperature difference, and energy consumption can be effectively reduced while the refrigerating capacity is guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of thermal management, and in particular to a thermal management system for a computer room with double circulation and a control method thereof. Background Art

[0002] Thermal management refers to the management and control of the temperature of the overall system, discrete components or their environment, with the purpose of maintaining the normal operation of each component or improving its performance or life. Currently, thermal management is usually required in fields such as electrochemical energy storage, and thermal management has a significant impact on the performance, life and safety of energy storage systems.

[0003] At present, air-cooled direct expansion air conditioners are usually used in computer rooms of data centers to achieve thermal management. Existing air-cooled direct expansion air conditioners generally use scroll compressors. Scroll compressors have been widely used due to their long development history and high market acceptance, and they almost have a monopoly in precision air conditioners in data centers. However, the variable frequency scroll compressor has a slow frequency increase and decrease speed, especially during the frequency increase process. After the variable frequency compressor is started, the frequency increase platform is used to control the frequency increase of the variable frequency compressor to ensure the smooth and reliable frequency increase process. It takes several minutes from startup to establishing 100% cooling capacity.

[0004] At the same time, due to the structural principle of the scroll compressor, it requires the moving and static scroll plates to be linearly meshed, and the moving scroll plate needs to be driven by the crankshaft to perform asymmetric circular motion. Asymmetric operation is prone to large vibrations and noises when the load is large and the speed is adjusted. The vibration of the compressor will cause vibrations in the unit's piping system, causing pipe cracks and refrigerant leakage. Therefore, the vibration of the compressor pipeline needs to be considered in the unit design, such as patent CN209877299U. At the same time, the air conditioner in the computer room runs 24 hours a day throughout the year, and the energy efficiency has a huge impact on the annual energy consumption. The direct contact between the various operating parts of the scroll compressor causes a lot of mechanical losses and friction, which limits the further improvement of the overall efficiency of the compressor.

[0005] In addition, the scroll compressor bearings use ball bearings, which require lubrication and sealing of lubricating oil to operate reliably. The use of lubricating oil will increase the cost of the refrigeration system, and a special system oil return design needs to be added during the unit design. The application site also requires additional maintenance costs. As described in patents CN204786795U and CN114811998A, long pipelines require additional oil replenishment, high-drop installations require additional oil return bends, and lubricating oil needs to be heated in cold seasons to prevent oil viscosity. Figure 1As shown, in the existing air conditioner based on the scroll compressor, in order to better return oil, taking the positive drop installation as an example (outdoor unit on top, indoor unit on the bottom), it is necessary to set the oil return bend 001 every few meters on the intermediate connecting pipeline to prevent the lubricating oil from sticking to the intermediate connecting pipe and the inside of the heat exchanger. At the same time, a shock absorbing device 002 is provided at the inlet and outlet of the turbo compressor, and the shock absorbing device 002 can be a shock absorbing tube or a special U-shaped pipe design to avoid frequent leakage of the copper pipe caused by the vibration of the compressor. In addition, a gas-liquid separator 003 is provided at the inlet end of the turbo compressor, and an oil separator 004 is provided at the outlet end, and the oil separator is further connected to the inlet of the turbo compressor through an oil return hose 005. It can be seen that its overall structure is complex, there are many interfaces, and there is a certain risk of leakage. Once the lubricating oil enters the refrigeration system, it also dissolves with the refrigerant, affecting the heat exchange effect of the refrigerant in the evaporator and condenser, directly causing the system refrigeration capacity to drop by more than 5%. The use of lubricating oil will also affect the life of the whole machine to a certain extent. The design life of a scroll compressor is 10 years, with 200,000 starts and stops. In actual applications, due to oil and liquid factors, it is generally used for about 6 to 8 years, so its life is relatively short. Summary of the invention

[0006] In view of some or all of the problems in the prior art, the present invention provides a computer room thermal management system with a double circulation, comprising:

[0007] A first power module including a compressor;

[0008] A second power module, which is arranged in parallel with the first power module, the second power module comprising a pump and a one-way valve; and

[0009] The control module is used to select the power module according to the difference between the external environment temperature and the internal temperature of the machine room.

[0010] Furthermore, the computer room thermal management system also includes:

[0011] An evaporator, which is arranged at the device to be cooled, and the refrigerant absorbs the heat emitted by the device to be cooled through the evaporator;

[0012] a condenser, the inlet of which is connected to the outlet of the air-floating centrifugal compressor and the one-way valve, and is used for heat exchange between the refrigerant after absorbing heat and the external air; and

[0013] The throttling element is arranged at the inlet of the evaporator and is used for throttling and expanding the cooled refrigerant.

[0014] Furthermore, the air inlet of the compressor is communicated with the outlet of the evaporator, and the air outlet of the compressor is communicated with the inlet of the condenser.

[0015] Furthermore, the compressor is an air-floating centrifugal compressor, comprising:

[0016] An electric motor comprising:

[0017] A shell, wherein a first chamber and a second chamber are respectively disposed at two ends thereof;

[0018] a rotor, on which a radial bearing is arranged, wherein the radial bearing is an air bearing; and a stator;

[0019] an impeller, arranged at an end of the rotor and located in the first chamber and / or the second chamber;

[0020] an air inlet, which is in communication with the air inlet of the first chamber;

[0021] an exhaust port, which is in communication with the air outlet of the second chamber;

[0022] The connecting pipe has two ends connected to the air outlet of the first chamber and the air inlet of the second chamber respectively.

[0023] Furthermore, the motor is a high-speed permanent magnet synchronous motor.

[0024] Furthermore, the air-floating centrifugal compressor further comprises:

[0025] a thrust plate disposed at an end of the rotor; and

[0026] The thrust bearing is arranged on one side or both sides of the thrust plate and is an air bearing.

[0027] Furthermore, the first chamber or the second chamber comprises a multi-stage impeller.

[0028] Furthermore, the impeller is a closed impeller.

[0029] Furthermore, the compressor also includes a liquid cooling module, which is arranged inside the compressor to cool the motor. The inlet of the liquid cooling module is connected to the outlet of the condenser through a first control valve, and the outlet of the liquid cooling module is connected to the inlet of the evaporator.

[0030] Furthermore, the pump is arranged between the condenser and the throttling element.

[0031] Further, an inlet of the one-way valve is connected to an outlet of the evaporator.

[0032] Furthermore, the computer room thermal management system also includes:

[0033] A second control valve is arranged at the inlet and outlet of the condenser; and / or

[0034] A third control valve is arranged at the outlet of the condenser.

[0035] Furthermore, the computer room thermal management system also includes:

[0036] A sight glass is arranged at the inlet of the throttling element.

[0037] Furthermore, the computer room thermal management system also includes:

[0038] A drying filter is arranged at the inlet of the throttling element.

[0039] Furthermore, the computer room thermal management system also includes:

[0040] A first fan is disposed at the condenser; and / or

[0041] A second fan is arranged at the evaporator.

[0042] Furthermore, the condenser is arranged outside the machine room and is connected with the modules inside the machine room through an intermediate connecting pipe.

[0043] Furthermore, the condenser and the first and second power modules are all arranged outside the machine room, and the evaporator and the throttling element are arranged inside the machine room.

[0044] Furthermore, the computer room thermal management system includes a plurality of evaporators and throttling elements arranged in parallel.

[0045] Based on the above-mentioned computer room thermal management system, the second aspect of the present invention provides a control method for computer room thermal management, comprising:

[0046] Detect the internal temperature of the computer room and the external ambient temperature;

[0047] Based on the difference between the internal temperature of the equipment room and the external ambient temperature, select the power module:

[0048] If the difference is greater than 20°C, a second power module is used; and

[0049] If the difference is less than or equal to 20°C, the first power module is used.

[0050] Furthermore, the control method further includes:

[0051] The opening of the first control valve is controlled according to the rotation speed of the compressor to control the flow of the refrigerant entering the liquid cooling module.

[0052] A third aspect of the present invention provides a computer room, such as a data center computer room, which includes the computer room thermal management system as described above.

[0053] The present invention provides a machine room thermal management system with dual circulation and a control method thereof, which includes two sets of parallel power systems. When the temperature difference between indoor and outdoor is large, the compressor can be turned off and power can be provided by a pump, thereby effectively reducing energy consumption. In addition, the machine room thermal management system adopts an air-floating centrifugal compressor, which does not require lubricating oil as a whole, and the unit design and application are relatively simple, eliminating the oil separator and the corresponding pipelines, reducing the cost of the structure and compressor oil. Since there is no need to consider the problem of oil return and oil viscosity change, it is more suitable for long pipeline system application and use in cold areas. In addition, the air-floating centrifugal compressor also has the following advantages: using air-floating bearings, the compressor and refrigeration system do not use compressor lubricating oil, and the refrigeration capacity of the system is improved. The air-floating compressor adopts gas dynamic seal, without mechanical friction and mechanical wear, and can increase the operating life to 150 years, and the number of starts and stops can reach 500,000 times. The air-floating centrifugal compressor is a fully symmetrical motion design, driving the refrigerant by the centrifugal force of the impeller, without the collision and friction of the dynamic and static vortex disks, and is very quiet. There is no need to consider separate compressor shock-absorbing pipe measures, and it will not cause refrigerant leakage. The ultra-high-speed air-floating centrifugal compressor can increase speed from 0rpm to 150,000rpm in 5 seconds, with fast refrigeration rate response and fast refrigeration output. The centrifugal compressor is small in size. Under the same cooling capacity, the centrifugal compressor based on high-speed permanent magnet synchronous motor has a volume reduction of about 50% and a weight reduction of about 90% compared with the scroll compressor. The air-floating air bearing is adopted. When the air-floating bearing is working, the rotor and the bearing are not in direct contact, thereby reducing energy loss and saving 30% energy compared with the scroll compressor. BRIEF DESCRIPTION OF THE DRAWINGS

[0054] To further illustrate the above and other advantages and features of various embodiments of the present invention, a more specific description of various embodiments of the present invention will be presented with reference to the accompanying drawings. It will be understood that these drawings only depict typical embodiments of the present invention and are therefore not to be considered as limiting the scope thereof. In the accompanying drawings, for clarity, identical or corresponding parts will be represented by identical or similar reference numerals.

[0055] Figure 1 A schematic diagram showing the structure of an existing thermal management system for a computer room based on a scroll compressor is shown;

[0056] Figure 2 A schematic structural diagram of a machine room thermal management system based on an air-floating centrifugal compressor according to an embodiment of the present invention is shown;

[0057] Figure 3 A schematic diagram showing the structure of a small cooling capacity air-floating centrifugal compressor for energy storage thermal management according to an embodiment of the present invention; and

[0058] Figure 4 A cross-sectional schematic diagram of a small-cooling air-floating centrifugal compressor for energy storage thermal management according to an embodiment of the present invention is shown.

[0059] Figure 5 A schematic diagram showing the structure of a computer room thermal management system with double circulation according to an embodiment of the present invention;

[0060] Figure 6 A schematic flow chart showing a control method of a computer room thermal management system with a double cycle according to an embodiment of the present invention; and

[0061] Figure 7 A schematic structural diagram of a computer room thermal management system with multiple cooling branches according to an embodiment of the present invention is shown.

[0062] Reference numerals list

[0063] 001 oil return bend, 002 shock absorber, 003 gas-liquid separator, 004 oil separator, 005 oil return hose

[0064] 201, 501, 701 compressor, 202, 502, 702 condenser, 203, 503, 7031,

[0065] 7032, 703n throttling element, 204, 504, 7041, 7042, 704n evaporator, 205,

[0066] 505, 705 first control valve, 206, 506, 706 second control valve, 207, 507, 707 sight glass, 208, 508, 708 third control valve, 209, 509, 709 drying filter, 210,

[0067] 510, 710 first fan, 211, 511, 7111, 7112, 711n second fan, 512 one-way valve, 513 pump, 301 air inlet, 302 exhaust port, 303 connecting pipe, 331 interstage air supply hole, 304, 305 first and second compression shells, 401 rotor, 411 air bearing, 412 thrust plate, 413 thrust bearing, 402 stator, 403 shell, 441, 442 first and second impellers, 451, 452 first and second end covers, 461, 462 first and second locking nuts, 471, 472 first and second sealing rings DETAILED DESCRIPTION

[0068] In the following description, the present invention is described with reference to various embodiments. However, those skilled in the art will recognize that various embodiments can be implemented without one or more specific details or with other replacement and / or additional methods, materials or components. In other cases, well-known structures, materials or operations are not shown or described in detail to avoid blurring the inventive point of the present invention. Similarly, for the purpose of explanation, specific quantities, materials and configurations are set forth to provide a comprehensive understanding of embodiments of the present invention. However, the present invention is not limited to these specific details. In addition, it should be understood that the various embodiments shown in the drawings are illustrative representations and are not necessarily drawn in correct proportions.

[0069] In this specification, reference to "one embodiment" or "the embodiment" means that a particular feature, structure, or characteristic described in conjunction with the embodiment is included in at least one embodiment of the present invention. The phrase "in one embodiment" appearing in various places in this specification does not necessarily all refer to the same embodiment.

[0070] In the embodiments of the present invention, the term "main gas path" refers to the gas flow path from the air inlet into the compressor for compression and then discharged through the exhaust port. The term "high-pressure side" refers to the side with higher air pressure inside the compressor, that is, the side where the last-stage impeller is located, and the term "low-pressure side" refers to the side of the compressor relative to the high-pressure side. Under normal circumstances, the gas flows from the high-pressure side to the low-pressure side through the air bearing and then returns to the main gas path.

[0071] The energy consumption of air conditioning in the data center accounts for about 40% of the entire data center, and the power consumption of air conditioning compressors in air-cooled computer rooms accounts for about 80%. If the energy consumption of air conditioning can be reduced, it will bring considerable benefits to the data center. If the energy consumption of air conditioning needs to be reduced, on the one hand, it can be started from improving the efficiency of the compressor, such as using an air-floating centrifugal compressor to replace the existing scroll compressor. Compared with the compressor of the traditional data center thermal management system, the air-floating centrifugal compressor has no oil return system, and the compressor and the system are simpler and more reliable. During operation, the bearing has no contact with the motor shaft, the bearing wear is small, and the service life is long. The internal circulation dynamic pressure air-floating bearing does not require an additional air supply pipeline, and the structure is simple and reliable. The closed impeller and the inner wall sealing teeth of the compressor shell can reduce leakage and reflux losses and improve the pneumatic efficiency of the compressor. In addition, the air-floating centrifugal compressor has a fast frequency increase speed, and the refrigeration system can respond to changes in the data center load more quickly. The compressor is small in size, and the refrigeration cycle can be designed with a higher energy density, which reduces the footprint of thermal management equipment for the data center. If it is necessary to reduce the energy consumption of air conditioning, on the other hand, the overall energy consumption of the thermal management system can be adjusted through reasonable control methods. For example, an additional circulation can be added so that when the temperature difference between indoor and outdoor is large, the refrigeration cycle does not need the compressor to generate a high pressure ratio to complete the flow of refrigerant and heat exchange, which is more energy-efficient.

[0072] The scheme of the present invention is further described below in conjunction with the accompanying drawings of the embodiments.

[0073] Figure 2 FIG. 1 is a schematic diagram showing a heat management system for a machine room based on an air-floating centrifugal compressor according to an embodiment of the present invention. Figure 2 As shown, a thermal management system for a computer room based on an air-floating centrifugal compressor includes a compressor 201, a condenser 202, a throttling element 203, and an evaporator 204. The compressor 201 serves as a power source for the refrigerant in the system, and compresses the refrigerant in a centrifugal manner. The compressed high-temperature refrigerant reaches the condenser 202, and the condenser exchanges the heat of the internal high-temperature refrigerant with the air. The condensed refrigerant reaches the throttling element 203, and the throttling element 203 throttles the refrigerant. The throttled refrigerant rapidly expands and enters the evaporator 204. In the evaporator 204, the throttled refrigerant absorbs heat from the device to be cooled, such as the air in the computer room, through the evaporator, so that the air in the computer room is reduced to the expected temperature. The evaporated refrigerant continues to reach the compressor 201 through the suction pipeline. Figure 2 As shown, in one embodiment of the present invention, only the condenser 202 is arranged outside the machine room as the outdoor unit, and the other modules are arranged inside the machine room. The condenser 202 is connected to the indoor unit through an intermediate connecting pipe.

[0074] like Figure 2 As shown, in one embodiment of the present invention, the thermal management system for the computer room further includes a second control valve 206, a sight glass 207, a third control valve 208 and a filter dryer 209. The compressed high-temperature refrigerant reaches the condenser 202 through the second control valve 206, and the condensed refrigerant passes through the second control valve 206, the sight glass 207, the third control valve 208 and the filter dryer 209 in sequence to reach the throttling element 203. In one embodiment of the present invention, the second control valve 206 is, for example, a pipeline ball valve, and the third control valve 208 is, for example, a solenoid valve.

[0075] like Figure 2 As shown, in one embodiment of the present invention, in order to improve the heat exchange efficiency, the computer room thermal management system further includes a first fan 210 and a second fan 211. The first fan 210 and the second fan 211 are respectively arranged at the condenser 202 and the evaporator 204, and the air can be quickly sucked into the fins of the condenser 202 and / or the evaporator 204 through the fans.

[0076] In addition, since the maximum speed of the compressor 201 is as high as 150,000 rpm, the heat of the internal motor is relatively large when rotating at high speed, so it can be cooled by liquid cooling. Figure 2As shown, in one embodiment of the present invention, a liquid cooling module is further provided inside the compressor, and the inlet of the liquid cooling module is connected to the indoor refrigerant liquid pipe. Specifically, a branch flow is bypassed from the indoor refrigerant liquid pipe, and the required refrigerant flow rate is controlled by the first control valve 205. The refrigerant after cooling the motor flows into the evaporator suction port and continues to participate in cooling the machine room.

[0077] Figure 3 and Figure 4 The structural schematic diagram and cross-sectional schematic diagram of a small cooling air-floating centrifugal compressor for energy storage thermal management according to an embodiment of the present invention are respectively shown. As shown in the figure, a small cooling air-floating centrifugal compressor for energy storage thermal management includes a motor, an impeller, an air inlet 301, an exhaust port 302 and a connecting pipe 303.

[0078] The motor includes a rotor 401, a stator 402 and a housing 403. The stator 402 is fixed inside the housing 403, and the central axis of the rotor 401 coincides with the central axis of the stator 402. Two radial air bearings 411 are provided on the rotor 401, and a thrust disk 412 is provided on the side close to the air inlet 301, and an air-floating thrust bearing 413 is provided on both sides of the thrust disk, respectively. The two thrust bearings are arranged opposite to each other to bear the axial thrust directed to the low-pressure side or the high-pressure side, respectively.

[0079] As shown in the figure, the first chamber and the second chamber are respectively provided at the two ends of the interior of the housing 403. The air inlet of the first chamber is connected to the air inlet 301 of the compressor, and it can also be understood that the air inlet 301 is the air inlet of the first chamber. The first impeller 441 is provided in the first chamber, and the first impeller 441 is fixed to the first end of the rotor 401. A connecting pipe 303 is provided between the first chamber and the second chamber. The gas compressed by the first impeller 441 flows out from the air outlet of the first chamber into the connecting pipe 303, and then enters the second chamber through the air inlet of the second chamber. The second chamber is provided with a second impeller 442, and the second impeller 442 is fixed to the second end of the rotor 401. Most of the gas compressed by the second impeller 442 flows out from the air outlet of the second chamber. The air outlet of the second chamber is connected to the exhaust port 302 of the compressor, and it can also be understood that the exhaust port 302 is the air outlet of the second chamber. As shown in the figure, in an embodiment of the present invention, the first chamber and the second chamber are respectively provided with a first end cover 451 and a second end cover 452 at the air outlet, and there is a gap between the first end cover 451 and the second end cover 452 and the rotor 401. At the same time, there is a certain gap between the first end cover 451 and the first impeller 441, and the gas flowing through the air bearing can return to the main gas path through this gap. There is also a certain gap between the second end cover 452 and the second impeller 442, and a part of the gas compressed by the second impeller 442 can enter the air bearing through this gap under the action of pressure. In one embodiment of the present invention, the first impeller 441 and the second impeller 442 are both closed impellers. Compared with the open impeller, the closed impeller can effectively eliminate the secondary flow from the pressure surface of the blade to the suction surface caused by the tip clearance, thereby effectively improving the aerodynamic efficiency of the compressor. In one embodiment of the present invention, as shown above, the first impeller 441 and the second impeller 442 are designed back-to-back, so that the axial thrusts of the first and second impellers are in opposite directions and cancel each other out, thereby effectively reducing the axial thrusts received by the thrust bearing. In one embodiment of the present invention, the first impeller 441 and the second impeller 442 are fixed to the rotor 401 by a first locking nut 461 and a second locking nut 462, respectively.

[0080] As shown in the figure, a first compression shell 304 and a second compression shell 305 are respectively provided on the outer sides of the two ends of the motor, a first sealing ring 471 is provided between the first compression shell 304 and the first impeller 441, and a second sealing ring 472 is provided between the second compression shell 305 and the second impeller 442. The first and second sealing rings can significantly reduce the backflow effect from the outlet to the inlet of the first and second impellers, and can further improve the efficiency of the compressor.

[0081] In order to reduce the compression power consumption of the second impeller 442, in one embodiment of the present invention, an interstage air supply hole 331 is also provided on the connecting pipe 303 to receive the exhaust gas from the economizer to cool the gas compressed by the first impeller, thereby achieving the purpose of reducing the compression power consumption of the high-pressure impeller and improving the efficiency of the system.

[0082] In one embodiment of the present invention, the motor adopts a high-speed permanent magnet synchronous motor, and its bearing is a non-contact bearing when working, so it can withstand a higher speed than a conventional ball bearing. According to the Euler formula of the compressor Δh=U2Cu2-U1Cu1, it can be known that for compressors with the same functional capacity, the greater the speed, the smaller the radial size, so the use of a permanent magnet synchronous motor can improve the power density of the compressor.

[0083] The working principle of the air-floating centrifugal compressor as described above is that the gas compressed by the second impeller enters the second radial bearing on the high-pressure side through the gap between the second impeller and the second end cover, and the gap between the second end cover and the rotor, and then enters the first radial bearing on the low-pressure side through the air gap between the stator and the rotor, and then passes through the gap between the thrust plate and the motor housing and the gap between the thrust plate and the first end cover, and then passes through the two thrust bearings in sequence, and finally passes through the gap between the first end cover and the rotor, and the gap between the first impeller and the second end cover, and enters the first chamber, that is, the exhaust port of the first impeller, and returns to the main air path to realize internal circulation. Compared with the static pressure air-floating bearing, the air-floating centrifugal compressor can omit the external air supply channel, simplify the system structure, and improve reliability.

[0084] As mentioned above, in one embodiment of the present invention, a dual circulation method is provided to further save energy and reduce consumption. Figure 5 FIG. 1 is a schematic diagram showing a structure of a computer room thermal management system with a dual circulation according to an embodiment of the present invention. Figure 5 As shown, a dual-circulation thermal management system for a computer room is Figure 2 A set of power modules is added to the thermal management system of the computer room shown in the figure. Specifically, the compressor is regarded as the first power module, and the newly added power module is regarded as the second power module. Then the first and second power modules can be regarded as parallel settings. The refrigerant cycle formed by the first power module is Figure 4 The second power module includes a one-way valve 512 and a pump 513, wherein the pump 513 is disposed between the condenser 502 and the throttling element 503, the inlet of the one-way valve 512 is connected to the outlet of the evaporator 504, and the outlet of the one-way valve 512 is connected to the inlet of the condenser 502.

[0085] Through the control module, the first and / or second power module can be selected according to the difference between the external environment temperature and the internal temperature of the machine room. Figure 6 FIG. 1 is a flow chart showing a control method of a computer room thermal management system with a dual circulation according to an embodiment of the present invention. Figure 6 As shown, a control method of a computer room thermal management system with a double cycle includes:

[0086] First, measure the internal temperature of the room and the external ambient temperature to determine the temperature difference between indoor and outdoor; and

[0087] Next, based on the difference between the internal temperature of the equipment room and the external ambient temperature, a power module is selected:

[0088] If the difference is greater than 20°C, a second power module is used; and

[0089] If the difference is less than or equal to 20°C, the first power module is used.

[0090] For example, in the winter season, when the ambient temperature is low and the temperature difference with the room is large, the compressor 501 can be controlled to stop working, and the superheated refrigerant gas of the evaporator 504 does not pass through the compressor 501, but flows to the outdoor condenser 502 through the one-way valve 512, and the cooled supercooled liquid flows to the indoor unit through the power transmission of the pump 513. Because the temperature difference between indoor and outdoor is large, the refrigeration cycle does not need the compressor to generate a high pressure ratio to push to complete the flow of refrigerant and heat exchange, which is more energy-efficient. In addition, when the first power module is used, the opening of the first control valve can also be controlled according to the speed of the compressor to control the refrigerant flow entering the liquid cooling module.

[0091] In one embodiment of the present invention, the compressor and the condenser can be arranged outdoors, and the throttling element and the evaporator can be arranged inside the machine room. In this embodiment, the outdoor unit is responsible for cooling the refrigerant gas into refrigerant liquid and providing power for the refrigerant circulation, and the outdoor unit discharges heat to the atmosphere. In one embodiment of the present invention, the indoor unit can be one indoor unit or multiple indoor units, and the indoor unit structure can be selected from the row air conditioning form, the room air conditioning form or other structural forms according to the place of use. Figure 7 FIG. 1 is a schematic diagram showing a structure of a computer room thermal management system with multiple cooling branches according to an embodiment of the present invention. Figure 7 The embodiment shown is Figure 2The illustrated embodiment has the same structure in the condenser and compressor parts, but the difference is that it includes a multi-path cooling path, that is, it includes multiple groups of evaporators 7041-704n and corresponding throttling elements 7031-703n arranged in parallel. The evaporator absorbs heat by evaporation and is responsible for drawing heat from the data center and discharging it to the outdoor unit. According to the heat exchange configuration of the outdoor unit and the indoor unit, the indoor unit can be a single unit or multiple indoor units to form a multi-split system. Because the centrifugal compressor does not need to use lubricating oil, compared with the traditional household and light commercial multi-split system, the computer room thermal management system with multiple cooling branches has natural advantages in terms of safety of use and ease of control, and is more suitable for innovative data centers and energy-saving transformation data centers.

[0092] The present invention further provides a computer room, such as a data center computer room, which includes the computer room thermal management system as described above.

[0093] Although various embodiments of the present invention are described above, it should be understood that they are presented as examples only and not as limitations. It is obvious to those skilled in the relevant art that various combinations, modifications and changes can be made thereto without departing from the spirit and scope of the present invention. Therefore, the breadth and scope of the present invention disclosed herein should not be limited by the exemplary embodiments disclosed above, but should only be defined according to the attached claims and their equivalents.

Claims

1. A dual-circulation thermal management system for a computer room, characterized in that: include: A first power module, which includes an air-floating centrifugal compressor; A second power module, which is arranged in parallel with the first power module, and the second power module includes a pump and a one-way valve; as well as The control module is configured to select a power module according to the difference between the external environment temperature and the internal temperature of the machine room.

2. The computer room thermal management system according to claim 1, characterized in that: Also includes: An evaporator, which is arranged at the device to be cooled, and the refrigerant absorbs the heat emitted by the device to be cooled through the evaporator; a condenser, the inlet of which is in communication with the outlet of the air-floating centrifugal compressor and the one-way valve, and is configured to perform heat exchange between the refrigerant after absorbing heat and the outside air; as well as The throttling element is arranged at the inlet of the evaporator and is configured to throttle and expand the cooled refrigerant.

3. The computer room thermal management system according to claim 2, characterized in that: The air inlet of the air-floating centrifugal compressor is communicated with the outlet of the evaporator, and the exhaust port of the compressor is communicated with the inlet of the condenser; and The air-floating centrifugal compressor also includes a liquid cooling module, which is arranged inside the air-floating centrifugal compressor and is configured to cool the motor of the air-floating centrifugal compressor. The inlet of the liquid cooling module is connected to the outlet of the condenser through a first control valve, and the outlet of the liquid cooling module is connected to the inlet of the evaporator.

4. The computer room thermal management system according to claim 2, characterized in that: The inlet of the one-way valve is connected to the outlet of the evaporator, and the pump is arranged between the condenser and the throttling element.

5. The computer room thermal management system according to claim 2, characterized in that: Also includes: A second control valve is arranged at the inlet and outlet of the condenser; and / or a third control valve, which is arranged at the outlet of the condenser; and / or a sight glass disposed at the inlet of the throttling element; and / or a drying filter, which is arranged at the inlet of the throttling element; and / or A first fan is disposed at the condenser; and / or A second fan is arranged at the evaporator.

6. The computer room thermal management system according to claim 2, characterized in that: The condenser is arranged outside the machine room and is connected with the modules inside the machine room through an intermediate connecting pipe.

7. The computer room thermal management system according to claim 2, characterized in that: The condenser and the first and second power modules are all arranged outside the machine room, and the evaporator and the throttling element are arranged inside the machine room.

8. The computer room thermal management system according to claim 7, characterized in that: The utility model comprises a plurality of evaporators and throttling elements which are arranged in parallel.

9. A control method for a computer room thermal management system according to any one of claims 1 to 8, characterized in that: Includes steps: Detect the internal temperature of the computer room and the external ambient temperature; Based on the difference between the internal temperature of the equipment room and the external ambient temperature, select the power module: If the difference is greater than 20°C, a second power module is used; and If the difference is less than or equal to 20°C, the first power module is used.

10. The control method according to claim 9, characterized in that: Also includes the steps: According to the rotation speed of the air-floating centrifugal compressor, the opening of the first control valve is controlled to control the flow of the refrigerant entering its liquid cooling module.

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