CN212339673U - Refrigerating system for data center - Google Patents
Refrigerating system for data center Download PDFInfo
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- CN212339673U CN212339673U CN202020971551.3U CN202020971551U CN212339673U CN 212339673 U CN212339673 U CN 212339673U CN 202020971551 U CN202020971551 U CN 202020971551U CN 212339673 U CN212339673 U CN 212339673U
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Abstract
The application discloses a refrigerating system for data center, relate to data center refrigeration technology field, this a refrigerating system for data center includes evaporative condenser, the heat transfer is terminal, first pipeline and second pipeline, the evaporative condenser who sets up at the data center is outdoor includes cooling coil and cold source, gaseous state refrigerant in the cooling coil can take place the heat exchange with the cold source and the phase transition is liquid refrigerant, the heat exchange takes place for the terminal indoor environment with data center of heat transfer that sets up in the data center room, liquid refrigerant in the heat exchanger can the phase transition be gaseous state refrigerant in the heat transfer terminal, first pipeline is used for carrying gaseous state refrigerant, be provided with gas suspension oil-free compressor on the first pipeline, gas suspension oil-free compressor intercommunication has the air supply jar, second pipeline is used for carrying liquid refrigerant. The refrigeration system not only simplifies the whole structure, but also improves the whole energy efficiency by adopting the phase-change refrigeration technology.
Description
Technical Field
The embodiment of the application relates to the technical field of data center refrigeration, in particular to a refrigeration system for a data center.
Background
With the rapid development of internet technology, the demand of data centers is increasing in recent years. The existing cooling scheme for the data center generally adopts a traditional chilled water system, and the traditional chilled water system mainly comprises a cooling tower, a cooling water pump, a water chilling unit, a chilled water pump, a tail end air conditioner and the like, so that the occupied space is large, and the overall energy-saving performance is poor.
Except the traditional chilled water system, the phase-change refrigeration system can also be used for refrigeration, but the phase-change refrigeration system inevitably needs to use a compressor, and the existing compressor has an oil return problem, so that the reliability of the phase-change refrigeration system is poor, and the phase-change refrigeration system cannot be popularized and applied in the field of data centers.
SUMMERY OF THE UTILITY MODEL
The embodiment of the application provides a refrigerating system for a data center, and the refrigerating system not only occupies a small space, but also has good energy-saving performance.
The present application provides a refrigeration system for a data center, comprising:
the evaporative condenser is arranged outside the data center and comprises a cooling coil and a cold source, a first refrigerant channel is arranged in the cooling coil, and the cold source can exchange heat with the cooling coil so that gaseous refrigerant in the first refrigerant channel is changed into liquid refrigerant;
the heat exchange tail end is arranged in a room of the data center, a heat exchanger is arranged in the heat exchange tail end, a second refrigerant channel is arranged in the heat exchanger, and the heat exchanger can exchange heat with the room of the data center so as to enable the liquid refrigerant in the second refrigerant channel to be changed into the gaseous refrigerant;
one end of the first conveying pipeline is communicated with a gaseous refrigerant inlet of the cooling coil, the other end of the first conveying pipeline is communicated with a gaseous refrigerant outlet of the heat exchanger, and the first conveying pipeline is provided with an air suspension oil-free compressor which is communicated with an air supply tank;
and one end of the second conveying pipeline is communicated with the liquid refrigerant outlet of the cooling coil, the other end of the second conveying pipeline is communicated with the liquid refrigerant inlet of the heat exchanger, and a pump body is arranged on the second conveying pipeline.
In one embodiment of the present application, the heat exchange end includes a back plate, and the back plate is attached to a cabinet to be cooled, which is disposed in the data center chamber.
In an embodiment of this application, the cold source includes cold water pond, shower, spray pump and shower head, the one end of shower with cold water pond intercommunication, the other end with the shower head intercommunication, the shower orientation cooling coil sets up, the spray pump sets up on the shower.
In an embodiment of this application, first pipeline with be provided with oil free compressor cooling branch road between the second pipeline, oil free compressor cooling branch road's one end intercommunication is in the low reaches of the pump body, the other end communicate in gas suspension oil free compressor.
In one embodiment of the present application, both ends of the gas suspension oil-free compressor are connected in parallel with a switch valve;
the refrigeration system for the data center further comprises a temperature sensor arranged outside the data center, the temperature sensor is used for detecting the outdoor temperature, and the switch valve is configured to be opened when the outdoor temperature is lower than the preset temperature.
In one embodiment of the present application, a liquid storage tank is disposed on the second delivery pipeline, and the liquid storage tank is located between the liquid refrigerant outlet of the cooling coil and the pump body.
In one embodiment of the present application, the number of the pump bodies is two, and two pump bodies are arranged in parallel on the second delivery pipe.
In one embodiment of the present application, the number of the back plates is plural;
the refrigeration system for a data center further includes:
the annular liquid refrigerant distribution pipeline is arranged between the other end of the second conveying pipeline and the liquid refrigerant inlets of the heat exchangers, and the liquid refrigerant in the cooling coil sequentially flows through the second conveying pipeline and the liquid refrigerant distribution pipeline to enter the liquid refrigerant inlets of the heat exchangers;
and the annular gaseous refrigerant distribution pipeline is arranged between the other end of the first conveying pipeline and a gaseous refrigerant outlet of the heat exchanger, and the gaseous refrigerant in the heat exchangers sequentially flows through the gaseous refrigerant distribution pipeline and the first conveying pipeline to enter a gaseous refrigerant inlet of the cooling coil.
In one embodiment of the present application, a gaseous refrigerant branch is disposed between the gaseous refrigerant outlet of the heat exchanger and the gaseous refrigerant distribution line, and an electronic expansion valve is disposed on the gaseous refrigerant branch;
a liquid refrigerant branch is arranged between a liquid refrigerant inlet of the heat exchanger and the liquid refrigerant distribution pipeline, a temperature sensing bulb is arranged on the liquid refrigerant branch, and the electronic expansion valve is configured to be capable of controlling the opening of the valve according to the superheat degree of the temperature sensing bulb.
In one embodiment of the present application, the heat exchanger is a microchannel heat exchanger or a copper tube aluminum fin heat exchanger.
According to the technology of the application, the problems of large occupied space and poor overall energy saving performance of the traditional chilled water system are solved, and the refrigerating system solves the problem of poor reliability when an oil compressor is used in a phase change refrigerating scheme by using an air suspension oil-free compressor, so that the phase change refrigerating scheme can be used for refrigerating a data center, and the energy saving performance is improved to a great extent; and because the refrigeration system adopts the phase-change refrigeration principle, the refrigeration of the data center can be realized only by comprising the refrigerant system, and compared with the traditional chilled water system, the system omits a chilled water system, a cooling water system and a lubricating oil system, so that the occupation of space is reduced.
It should be understood that the statements in this section do not necessarily identify key or critical features of the embodiments of the present disclosure, nor do they limit the scope of the present disclosure. Other features of the present disclosure will become apparent from the following description.
Drawings
The drawings are included to provide a better understanding of the present solution and are not intended to limit the present application. Wherein:
fig. 1 is a schematic structural diagram of a refrigeration system for a data center according to an embodiment of the present disclosure.
In the figure:
1. an evaporative condenser; 11. a cooling coil; 12. a cold source; 121. a cold water tank; 122. a shower pipe; 123. a spray pump; 124. a shower head; 13. a water quality sensor; 14. a drainage channel; 15. an electrically heated sensor;
2. a back plate; 21. an electronic expansion valve; 22. a temperature sensing bulb;
3. a first delivery line; 31. a gas suspension oil-free compressor; 32. an on-off valve;
4. a second delivery line; 41. fluorobenzene; 42. a liquid storage tank;
5. an outdoor wet bulb temperature sensor;
6. an air supply tank;
7. and a cooling branch of the oil-free compressor.
Detailed Description
The following description of the exemplary embodiments of the present application, taken in conjunction with the accompanying drawings, includes various details of the embodiments of the application for the understanding of the same, which are to be considered exemplary only. Accordingly, those of ordinary skill in the art will recognize that various changes and modifications of the embodiments described herein can be made without departing from the scope and spirit of the present application. Also, descriptions of well-known functions and constructions are omitted in the following description for clarity and conciseness.
Referring to fig. 1, an embodiment of the present application provides a refrigeration system for a data center (hereinafter, referred to as a refrigeration system) that can be used in the data center to refrigerate cabinets in an IT machine room of the data center. This refrigerating system includes evaporative condenser 1, heat transfer end, first conveying line 3 and second conveying line 4, and evaporative condenser 1 sets up in data center's the outdoor, and the heat transfer end sets up the indoor in data center's IT computer lab to carry out the heat exchange with IT computer lab internal environment, and evaporative condenser 1 and heat transfer end connection are with first conveying line 3 and second conveying line 4, in order to form the annular passage that allows the refrigerant circulation.
Specifically, the evaporative condenser 1 includes a cooling coil 11 and a cold source 12, a lumen of the cooling coil 11 forms a first refrigerant channel, and two ends of the first refrigerant channel are open and respectively form a gaseous refrigerant inlet and a liquid refrigerant outlet. The cooling medium of the cold source 12 can contact with the cooling coil 11 and exchange heat with the gaseous refrigerant entering the first refrigerant channel, so that the gaseous refrigerant undergoes a phase change to form a liquid refrigerant outlet. Optionally, a shut-off valve is provided at each end of the cooling coil 11.
Optionally, the cold source 12 includes a cold water tank 121, a spray pipe 122 and a spray pump 123, the cold water in the cold water tank 121 is the above-mentioned refrigeration medium, one end of the spray pipe 122 is communicated with the cold water tank 121, and the other end is disposed toward the cooling coil 11. The spray pump 123 is disposed on the spray pipe 122, and is configured to pump the cold water with a relatively low temperature in the cold water pool 121 into the spray pipe 122, and spray the cold water from the spray pipe 122 to the cooling coil 11, so as to cause the phase change of the gaseous refrigerant in the cooling coil 11.
Further, in order to improve the spraying uniformity, the cold source 12 further includes a plurality of spray headers 124, the other end of the spray pipe 122 is provided with a plurality of mounting holes, a spray header 124 is mounted in each mounting hole, the plurality of spray headers 124 are uniformly distributed above the cooling coil 11, and each spray header 124 is disposed toward the cooling coil 11. Of course, in other embodiments, a plurality of shower heads 124 may be disposed on the upper and lower sides of the cooling coil 11, respectively, to further improve the uniformity of spraying and improve the heat exchange effect.
The cold water tank 121 and the cooling chamber provided with the cooling coil 11 and the spray pipe 122 are both provided with a drainage channel 14, and the drainage channel 14 is provided with a drain valve so as to realize the replacement of cold water in the cold water tank 121 and the emptying of cold water after heat exchange between the cooling chamber and the cooling coil 11 is completed. A water quality sensor 13 is disposed in the cold water tank 121 to detect the quality of cold water in the cold water tank 121. An electric heating sensor 15 is arranged in the cold water tank 121 and used for detecting and adjusting the temperature of cold water in the cold water tank 121 so as to enable the cold water to meet the use requirement.
The heat exchanger is arranged in the heat exchange tail end, the second refrigerant channel is arranged in the heat exchanger, openings at two ends of the second refrigerant channel are respectively a gas refrigerant outlet and a liquid refrigerant inlet, the liquid refrigerant flowing out of the evaporative condenser 1 enters the second refrigerant channel through the liquid refrigerant inlet and exchanges heat with the internal environment of the IT machine room, and the liquid refrigerant after heat exchange is changed into the gas refrigerant and flows out of the second refrigerant channel from the gas refrigerant outlet.
In order to improve the heat transfer effect, in this embodiment, the heat transfer is terminal including backplate 2, and backplate 2 is platelike structure, and IT is indoor that data center is arranged in to backplate 2 to directly with set up in the indoor rack laminating of cooling of treating of data center IT computer lab, thereby realize treating the cooling nearby of cooling the rack, with the maximize of guaranteeing heat transfer area, the minimizing of heat transfer distance, and then improve the heat transfer effect.
Alternatively, the heat exchanger provided in the back plate 2 may be a microchannel heat exchanger. Compared with the common heat exchanger, the size of the second refrigerant channel in the micro-channel heat exchanger is smaller, so that the using amount of the refrigerant is reduced, the weight of the heat exchanger is further reduced, and the heat exchange efficiency is improved. In addition to the microchannel heat exchanger, the heat exchanger disposed in the back plate 2 may also be a copper tube aluminum fin heat exchanger.
The first conveying line 3 is used for communicating the cooling coil 11 of the evaporative condenser 1 with the heat exchanger in the back plate 2 to realize the flow of the gaseous refrigerant between the heat exchanger and the cooling coil 11. Specifically, one end of the first conveying line 3 communicates with the gaseous refrigerant inlet of the cooling coil 11, and the other end communicates with the gaseous refrigerant outlet of the heat exchanger. The first conveying pipeline 3 is provided with an air suspension oil-free compressor 31, the air suspension oil-free compressor 31 is communicated with the air supply tank 6, and the air suspension oil-free compressor 31 is used for converting low-pressure gaseous refrigerant into high-pressure gaseous refrigerant.
The gas suspension oilless compressor 31 does not need lubricating oil in the working process, so that the whole refrigerating system can omit a lubricating oil system for transmitting lubricating oil, the whole structure of the refrigerating system is simplified, the stability of the refrigerating system is improved, and the refrigerating system can cool down the to-be-cooled cabinets in a plurality of IT chambers of a data center at the same time.
In order to cool the gas suspension oil-free compressor 31 when necessary, an oil-free compressor cooling branch 7 is arranged between the first conveying pipeline 3 and the second conveying pipeline 4, one end of the oil-free compressor cooling branch 7 is communicated with the downstream of the pump body, the other end of the oil-free compressor cooling branch 7 is communicated with the gas suspension oil-free compressor 31, and an electric valve is arranged on the oil-free compressor cooling branch 7.
Further, bypass branches are connected in parallel to both sides of the gas suspension oil-free compressor 31, and a switch valve 32 is provided on the bypass branches, so that the gas suspension oil-free compressor 31 can be switched between the operating state and the bypass state by controlling the opening and closing of the switch valve 32. And the opening and closing of the on-off valve 32 is determined by a temperature sensor provided outside the data center for detecting the outdoor temperature. When the outdoor temperature detected by the temperature sensor is lower than the preset temperature, the on-off valve 32 is opened, and the gas suspension oil-free compressor 31 is bypassed; and when the outdoor temperature detected by the temperature sensor is not lower than the preset temperature, the switching valve 32 is turned off, and the gas suspension oil-free compressor 31 operates. Optionally, the temperature sensor is an outdoor wet bulb temperature sensor 5 for detecting the outdoor wet bulb temperature, and the preset temperature may be 6 ℃.
In a word, the cooperation of the switch valve 32 and the outdoor wet bulb temperature sensor 5 enables the cooling system to have a natural cooling mode and a mechanical refrigeration mode, when the outdoor wet bulb temperature is lower than the indoor temperature by 6 ℃, the natural cooling mode is adopted, and the air suspension oil-free compressor 31 is bypassed; and when the outdoor wet bulb temperature is not lower than the indoor temperature of 6 ℃, the mechanical refrigeration mode is adopted, and the gas suspension oil-free compressor 31 works.
Further, an electric valve and a filter may be disposed on the first conveying pipeline 3 at the upstream pipeline of the gas suspension oil-free compressor 31, the electric valve is used for controlling the on-off of the upstream pipeline of the gas suspension oil-free compressor 31, and the filter is used for filtering the gaseous refrigerant. A shut-off valve may be provided on the first transfer line 3 on a downstream line of the gas suspension oil-free compressor 31 to control on/off of the downstream line of the gas suspension oil-free compressor 31. A check valve is further provided on the first transfer line 3 in parallel with the on-off valve 32 and downstream of the air-floating oil-free compressor 31.
The second conveying line 4 is used for communicating the cooling coil 11 of the evaporative condenser 1 with the heat exchanger in the back plate 2 to realize the flow of the liquid refrigerant between the heat exchanger and the cooling coil 11. Specifically, one end of the second conveying pipeline 4 is communicated with a liquid refrigerant outlet of the cooling coil 11, the other end of the second conveying pipeline is communicated with a liquid refrigerant inlet of the heat exchanger, and a pump body is arranged on the second conveying pipeline 4 and provides power for flowing of the liquid refrigerant.
In this embodiment, fluorobenzene 41 is used for the pump body. The two fluorobenzene 41 s are provided, and the two fluorobenzene 41 s are provided in parallel on the second conveying pipe 4. A check valve is provided on each branch where the fluorobenzene 41 is provided, and the check valve is located downstream of the fluorobenzene 41. Optionally, a receiver 42 is further disposed on the second delivery pipe 4 upstream of the fluorobenzene 41, and the receiver 42 is configured to store a certain amount of liquid refrigerant. A shut-off valve is further disposed on the second delivery pipe 4 upstream of the reservoir 42, and a shut-off valve and a filter are further disposed between the reservoir 42 and the fluorobenzene 41 in sequence.
Present data center generally all includes a plurality of IT computer rooms, respectively is provided with at least one in each IT computer room and treats the cooling rack, in order to cool off the rack that treats that sets up in different IT computer rooms, in this embodiment, is provided with a plurality of backplates 2, and a plurality of backplates 2 set up in the different IT computer rooms of data center according to the demand, and each backplate 2 all with treat that the cooling rack directly laminates.
In order to communicate the plurality of backplates 2 with the first and second delivery lines 3, 4 and to simplify the piping, the refrigeration system further comprises a liquid refrigerant distribution line in the shape of a ring and a gaseous refrigerant distribution line in the shape of a ring. The liquid refrigerant distribution pipeline is arranged between the other end, close to the liquid refrigerant inlet of the heat exchanger, of the second conveying pipeline 4 and the liquid refrigerant inlet of the heat exchanger, and the liquid refrigerant in the cooling coil 11 sequentially flows through the second conveying pipeline 4 and the liquid refrigerant distribution pipeline to enter the liquid refrigerant inlets of the plurality of heat exchangers, so that the liquid refrigerant enters the heat exchangers. Gaseous refrigerant distribution pipeline sets up between the gaseous refrigerant export of the other end that is close to the gaseous refrigerant export of heat exchanger of first transfer line 3 and heat exchanger, and gaseous refrigerant in a plurality of heat exchangers flows through gaseous refrigerant distribution pipeline and first transfer line 3 in proper order and gets into the gaseous refrigerant entry of cooling coil 11 to get into cooling coil 11.
Further, a gaseous refrigerant branch is provided between the gaseous refrigerant outlet of each heat exchanger and the gaseous refrigerant distribution line, and an electronic expansion valve 21 is provided on the gaseous refrigerant branch. A liquid refrigerant branch is arranged between the liquid refrigerant inlet of the heat exchanger and the liquid refrigerant distribution pipeline, and a temperature sensing bulb 22 is arranged on the liquid refrigerant branch. When the load of the back plate 2 changes, the electronic expansion valve 21 can control the valve opening according to the superheat degree of the thermal bulb 22, so as to achieve the purpose of adjusting the refrigerant flow.
Optionally, quick couplings are further provided at the ends of the gaseous and liquid refrigerant branches to facilitate quick connection to the gaseous and liquid refrigerant distribution lines. And, a shutoff valve, a temperature sensor and a pressure sensor are provided in each of the gas refrigerant branch passage and the liquid refrigerant branch passage.
In a word, compared with the traditional chilled water system, the cooling system provided by the embodiment improves the overall energy saving performance by utilizing the phase-change heat exchange technology; the cabinet to be cooled is cooled nearby by utilizing the back plate 2, and the heat exchange effect is improved. And the refrigeration water system, the cooling water system and the lubricating oil system of the traditional refrigeration water system are omitted, and only the refrigerant circulating system is reserved, so that the structure of the data center is simplified to the greatest extent, the investment cost is reduced, and the production and delivery speed is improved.
The above-described embodiments should not be construed as limiting the scope of the present application. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions may be made in accordance with design requirements and other factors. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims (10)
1. A refrigeration system for a data center, comprising:
the evaporative condenser (1) is arranged outdoors of a data center, the evaporative condenser (1) comprises a cooling coil (11) and a cold source (12), a first refrigerant channel is arranged in the cooling coil (11), and the cold source (12) can exchange heat with the cooling coil (11) so that gaseous refrigerant in the first refrigerant channel is changed into liquid refrigerant;
the heat exchange tail end is arranged in a room of the data center, a heat exchanger is arranged in the heat exchange tail end, a second refrigerant channel is arranged in the heat exchanger, and the heat exchanger can exchange heat with the room of the data center so as to enable the liquid refrigerant in the second refrigerant channel to be changed into the gaseous refrigerant;
one end of the first conveying pipeline (3) is communicated with a gaseous refrigerant inlet of the cooling coil (11), the other end of the first conveying pipeline is communicated with a gaseous refrigerant outlet of the heat exchanger, an air suspension oil-free compressor (31) is arranged on the first conveying pipeline (3), and the air suspension oil-free compressor (31) is communicated with an air supply tank (6);
one end of the second conveying pipeline (4) is communicated with a liquid refrigerant outlet of the cooling coil (11), the other end of the second conveying pipeline is communicated with a liquid refrigerant inlet of the heat exchanger, and a pump body is arranged on the second conveying pipeline (4).
2. The refrigeration system for the data center according to claim 1, wherein the heat exchanging tip comprises a back plate (2), and the back plate (2) is attached to a cabinet to be cooled arranged in the data center chamber.
3. The refrigeration system for the data center according to claim 1, wherein the cold source (12) comprises a cold water tank (121), a spray pipe (122), a spray pump (123) and a spray header (124), one end of the spray pipe (122) is communicated with the cold water tank (121), the other end is communicated with the spray header (124), the spray header (124) is disposed toward the cooling coil (11), and the spray pump (123) is disposed on the spray pipe (122).
4. The refrigeration system for a data center according to claim 1, wherein an oil-free compressor cooling branch (7) is arranged between the first conveying pipeline (3) and the second conveying pipeline (4), one end of the oil-free compressor cooling branch (7) is communicated with the downstream of the pump body, and the other end is communicated with the gas suspension oil-free compressor (31).
5. The refrigeration system for data center according to claim 1, wherein both ends of the gas suspension oil-free compressor (31) are connected in parallel with a switch valve (32);
the refrigeration system for the data center further comprises a temperature sensor arranged outside the data center, the temperature sensor is used for detecting the outdoor temperature, and the switch valve (32) is configured to be opened when the outdoor temperature is lower than the preset temperature.
6. Refrigeration system for a data center according to claim 1, wherein a liquid reservoir (42) is provided on the second delivery line (4), said reservoir (42) being located between the liquid refrigerant outlet of the cooling coil (11) and the pump body.
7. Refrigeration system for a data center according to claim 1, wherein the number of pumps is two, two of said pumps being arranged in parallel on the second delivery line (4).
8. The refrigeration system for a data center of claim 2,
the number of the back plates (2) is multiple;
the refrigeration system for a data center further includes:
the annular liquid refrigerant distribution pipeline is arranged between the other end of the second conveying pipeline (4) and the liquid refrigerant inlets of the heat exchangers, and the liquid refrigerant in the cooling coil (11) flows through the second conveying pipeline (4) and the liquid refrigerant distribution pipeline in sequence to enter the liquid refrigerant inlets of the heat exchangers;
and the annular gaseous refrigerant distribution pipeline is arranged between the other end of the first conveying pipeline (3) and a gaseous refrigerant outlet of the heat exchanger, and the gaseous refrigerant in the heat exchangers sequentially flows through the gaseous refrigerant distribution pipeline and the first conveying pipeline (3) to enter a gaseous refrigerant inlet of the cooling coil (11).
9. The refrigeration system for a data center of claim 8,
a gaseous refrigerant branch is arranged between a gaseous refrigerant outlet of the heat exchanger and the gaseous refrigerant distribution pipeline, and an electronic expansion valve (21) is arranged on the gaseous refrigerant branch;
a liquid refrigerant branch is arranged between a liquid refrigerant inlet of the heat exchanger and the liquid refrigerant distribution pipeline, a temperature sensing bulb (22) is arranged on the liquid refrigerant branch, and the electronic expansion valve (21) is configured to be capable of controlling the opening degree of the valve according to the superheat degree of the temperature sensing bulb (22).
10. The refrigeration system for the data center according to any one of claims 1 to 9, wherein the heat exchanger is a microchannel heat exchanger or a copper-tube aluminum fin heat exchanger.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113865134A (en) * | 2021-11-15 | 2021-12-31 | 北京百度网讯科技有限公司 | Carbon dioxide refrigeration system and method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113865134A (en) * | 2021-11-15 | 2021-12-31 | 北京百度网讯科技有限公司 | Carbon dioxide refrigeration system and method |
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