CN116568007A

CN116568007A - Data center dry ice refrigerating system and control method thereof

Info

Publication number: CN116568007A
Application number: CN202310616190.9A
Authority: CN
Inventors: 曾宪毅; 苏志鹏; 邱朝明
Original assignee: Guangzhou Power Supply Bureau of Guangdong Power Grid Co Ltd
Current assignee: Guangzhou Power Supply Bureau of Guangdong Power Grid Co Ltd
Priority date: 2023-05-29
Filing date: 2023-05-29
Publication date: 2023-08-08

Abstract

The invention belongs to the technical field of data center refrigeration, and discloses a data center dry ice refrigeration system and a control method thereof, wherein the data center dry ice refrigeration system comprises a closed cold channel and a dry ice heat exchange device; the closed cold channel is formed by a cabinet, a closed door and a top plate, the closed door and the top plate are made of heat insulation materials, the dry ice heat exchange device is arranged at the top of the cabinet and comprises a dry ice box, an exhaust pipe, a water receiving disc, a condensate pipe and a fan, dry ice is placed in the dry ice box, an opening door is arranged on one side of the dry ice box and is used for adding dry ice, the exhaust pipe is used for discharging carbon dioxide generated by sublimation of the dry ice, the water receiving disc and the condensate pipe are used for collecting condensate water generated in the heat exchange process, and the fan is used for generating air circulating power. According to the data center dry ice refrigerating system, the hot air of the data center is cooled through sublimation heat absorption of dry ice, and normal operation of the data center is guaranteed. The system has simple structure, no toxic or harmful substances, small occupied space and flexible installation.

Description

Data center dry ice refrigerating system and control method thereof

Technical Field

The invention belongs to the technical field of data center refrigeration, and particularly relates to a data center dry ice refrigeration system and a control method thereof.

Background

At present, in the information age, the transfer, calculation and storage of data are becoming increasingly important. In order to meet the demands for large-scale and flexible use of data, the data center industry is greatly developed. During operation of the equipment in the data center, a large amount of heat is generated, and if the heat is not removed in time, the electronic components are overheated, the working performance is reduced, and even the data is damaged.

The refrigeration system of the data center is important to ensure that the server operates normally. At present, a refrigeration system of a data center mostly adopts a refrigeration mode of a water chilling unit, and most of the refrigerant is toxic and harmful to the environment. And the arrangement of the cold source auxiliary equipment and the pipelines occupies a large amount of space. When the data center is updated and expanded, the transformation is difficult.

The existing data center refrigeration system has the following specific defects and problems:

1) The refrigerant has toxicity: at present, most data centers adopt a water chilling unit for refrigeration, and most of the refrigerants are toxic and harmful substances such as Freon, so that the refrigerants have certain harm to the environment and human bodies.

2) The occupied space is large: the cooling of the water chilling unit needs to occupy a large amount of room space, including the arrangement of cold source auxiliary equipment and pipelines, which limits the expansion and transformation of the data center and increases the operation and maintenance cost.

3) The energy consumption is high: the traditional refrigerating system of the water chilling unit has higher energy consumption, thereby not only increasing the energy cost, but also increasing the environmental burden.

4) The maintenance difficulty is high: the cooling system of the water chilling unit has higher maintenance difficulty, needs professional personnel to maintain and debug, and has relatively higher maintenance cost.

5) The transformation is inflexible: the existing data center refrigerating system is inflexible to reform, and particularly when the existing data center refrigerating system is expanded, the original system is required to be destructively reformed, so that the maintenance cost and the operation and maintenance risk of the system are increased.

6) It is difficult to accommodate high density servers: with the continuous development of computer technology, the number and density of servers in a data center are continuously increased, and the traditional refrigeration system is difficult to meet the requirement of a high-density server, so that an overheating phenomenon is easy to occur.

7) The noise is big: the cooling system of the water chilling unit is required to dissipate heat through the fan, so that noise is generated greatly, and the working environment and user experience of the data center are affected to some extent.

In summary, the existing data center refrigeration system has problems and defects of toxic refrigerant, large occupied space, high energy consumption, high maintenance difficulty, inflexible transformation, difficulty in adapting to a high-density server, high noise and the like, and needs to search for more advanced, efficient and environment-friendly refrigeration technology to meet the refrigeration requirement of the data center.

Disclosure of Invention

Aiming at the problems existing in the prior art, the invention provides a data center dry ice refrigerating system and a control method thereof.

The invention is realized in that a data center dry ice refrigeration system comprises:

the closed cold channel is used for separating cold air and hot air and preventing the cold air from exchanging heat with the outside;

and the dry ice heat exchange device is used for exchanging heat with hot air by taking dry ice as a cold source, reducing the temperature and humidity of the air and sending the cold air to the cabinet for heat dissipation.

Further, the closed cold channel comprises a cabinet, a closed door and a top plate, wherein the closed door is arranged in the middle of the front face of the adjacent cabinet, the top plate is arranged at the upper end of the cabinet, and the closed door and the top plate are made of heat insulation materials.

Further, the dry ice heat exchange device is arranged at the top of the cabinet and comprises a dry ice box and a fan, dry ice is stored in the dry ice box, an opening door is arranged on one side of the dry ice box, and two fans are respectively arranged at two ends of the closed cold channel.

Further, the upper side and the side of the dry ice box are respectively communicated with an exhaust pipe and a condensate pipe, and the upper end of the exhaust pipe extends out from the upper side of the closed cold channel.

Further, a water receiving tray is arranged at the lower end of the dry ice box.

Further, the outside of the dry ice box is wrapped with a heat insulation material.

Further, the fan is positioned at the hot air inlet for generating air circulation power.

Further, the condensed water pipe is wrapped with a heat insulation material.

Another object of the present invention is to provide a control method of a dry ice refrigerating system of a data center, the control method of the dry ice refrigerating system of the data center comprising:

firstly, hot air reaches a dry ice heat exchange device under the action of a fan, the dry ice box absorbs heat in the hot air, the air temperature is reduced, dry ice sublimates into carbon dioxide at the same time, the carbon dioxide is discharged from an exhaust pipe, condensed water generated in the heat exchange process flows into a water receiving disc, and the condensed water is discharged from a condensation water pipe;

step two, after the hot air exchanges heat with the dry ice, the hot air enters a closed cold channel, and the hot air exchanges heat with a condensation water pipe for the second time before entering a cabinet, so that the air temperature is further reduced;

and thirdly, cold air enters from the front end of the cabinet, after the equipment is cooled, the temperature of the air is increased, the formed hot air is discharged to a hot channel from the rear end of the cabinet, and the gas in the hot channel is sent to a dry ice heat exchange device by a fan for heat exchange, so that the cooling device circulates and cools the cabinet of the data center.

In combination with the technical scheme and the technical problems to be solved, the technical scheme to be protected has the following advantages and positive effects:

according to the data center dry ice refrigerating system, the hot air of the data center is cooled through sublimation heat absorption of dry ice, and normal operation of the data center is guaranteed. The system has simple structure, no toxic or harmful substances, small occupied space and flexible installation. The boiling point of the dry ice is about-78 ℃, and a large amount of heat can be absorbed in the sublimation process, so that the dry ice can be widely applied to the fields of food preservation, refrigerated transportation, fire fighting and the like. At present, the traditional refrigerant has toxicity and most damages the environment, but carbon dioxide sublimated from dry ice is nonflammable, nontoxic and has little harm to the environment.

According to the invention, the exhaust pipe is arranged on the dry ice box, so that carbon dioxide generated by sublimation of dry ice is discharged outdoors, and the carbon dioxide is prevented from being directly emitted into a machine room, thereby ensuring the safe operation of operation and maintenance personnel.

When the hot air exchanges heat with the dry ice box with lower temperature, condensed water can be generated due to the low surface temperature of the dry ice box. On the one hand, the air humidity is reduced. The dual effects of cooling and dehumidifying are achieved. On the other hand, the collected condensed water can exchange heat with the air again, so that the cooling effect is enhanced.

According to the data center dry ice refrigerating system, the cold channel is set to be the closed cold channel, so that the cold air and the hot air are prevented from being mixed, the cold source is placed in the closed cold channel, the top plate and the closed door are made of heat insulation materials, the cold loss is prevented, and the cooling effect is enhanced.

Secondly, the invention utilizes the principle of sublimation and heat absorption of dry ice to dissipate heat of the data center. The system has simple structure, small occupied area and flexible system arrangement and transformation. In the refrigeration process, only the fan is powered to provide air circulation power, and other electric power is not needed. And the equipment such as a water chilling unit and an outdoor unit in the conventional cold source is reduced, and the noise influence is reduced.

Thirdly, the invention can also bring the following advantages and positive effects:

1) The refrigerating efficiency is improved: through optimizing aspects such as fan position, dry ice storage, heat preservation material, blast pipe design, condensate line, etc., can improve refrigeration efficiency, make the inside temperature of rack more high-efficient reduction of system to guarantee data center's normal operating.

2) The energy consumption and the cost are reduced: by reasonably utilizing the dry ice and optimizing the refrigerating system, the energy consumption and the cost can be reduced, and the energy utilization efficiency of the system is improved, so that the operation cost of the data center is reduced.

3) Stability and reliability are improved: by optimizing the refrigerating system, the stability and the reliability of the system can be improved, so that the probability of faults and the maintenance cost are reduced, and the stability and the reliability of the data center are ensured.

4) The intelligent degree is improved: the intelligent control system is adopted to carry out more accurate and intelligent adjustment on the refrigerating system, so that the intelligent degree and the automation degree of the system are improved, the requirement of manual intervention is reduced, and the operation and maintenance efficiency and the manageability of a data center are improved.

5) The adaptability is improved: by adopting the multiple refrigeration technology, the adaptability and the flexibility of the system can be improved, so that the system can be better adapted to different environments and working loads, and the stability and the reliability of the data center are ensured.

6) Improving user experience: through optimization in aspects of improving refrigeration efficiency, reducing noise and the like, user experience can be improved, user satisfaction is improved, and therefore loyalty and praise of users are increased.

In a word, through optimizing data center dry ice refrigerating system, can improve refrigeration efficiency, reduce energy consumption and cost, improve stability and reliability, improve intelligent degree and adaptability, improve positive effects in aspects such as user experience to provide powerful support for data center's steady operation and sustainable development.

Drawings

Fig. 1 is a schematic structural diagram of a dry ice refrigerating system of a data center according to an embodiment of the present invention;

in the figure: 1. a cabinet; 2. closing the door; 3. a top plate; 4. a dry ice bank; 5. an exhaust pipe; 6. a water receiving tray; 7. a condenser water pipe; 8. a blower.

Detailed Description

The present invention will be described in further detail with reference to the following examples in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.

The working principle of the data center dry ice refrigerating system provided by the embodiment of the invention is as follows:

1) And (3) cold air circulation: the cabinet, the closed door and the top plate form a closed cold channel, cold air is generated by the dry ice heat exchange device and is sucked into the cabinet by the fan to form circulation.

2) And (3) refrigerating by using dry ice: the dry ice box stores dry ice, the dry ice absorbs heat and sublimates into carbon dioxide through the exhaust pipe at the upper end of the dry ice box, and the carbon dioxide is discharged from the exhaust pipe, and a large amount of heat is absorbed in the process, so that the temperature in a cold channel is reduced.

3) And (5) discharging condensed water: after the hot air passes through the dry ice box, the generated condensed water flows into the water receiving disc and is discharged through the condensed water pipe, and the heat insulation material is wrapped outside the condensed water pipe so as to prevent the condensed water from being regenerated in the pipeline.

4) Air circulation power: the fan is positioned at the hot air inlet, and air circulation is promoted by generating airflow power, so that cold air continuously flows, and the refrigerating effect of the data center is realized.

In general, the system utilizes the principle of dry ice refrigeration, and absorbs heat through the dry ice heat exchange device, so that the temperature in a cold channel is reduced, and meanwhile, cold air continuously flows through air circulation power, so that the refrigeration effect of the data center is realized. Meanwhile, the heat insulation material is adopted in the system to prevent excessive heat exchange and secondary heat exchange, so that the efficiency and the operation stability of the system are improved.

As shown in fig. 1, the data center dry ice refrigerating system provided by the embodiment of the invention comprises a closed cold channel and a dry ice heat exchange device.

The closed cold channel is formed by a cabinet 1, a closed door 2 and a top plate 3, wherein the closed door 2 and the top plate 3 are made of heat insulation materials so as to prevent cold air in the cold channel from exchanging heat with the outside.

The dry ice heat exchange device is arranged at the top of the cabinet and comprises a dry ice box 4, an exhaust pipe 5, a water receiving disc 6, a condensate pipe 7 and a fan 8.

The dry ice box 4 is internally stored with dry ice, and one side of the dry ice box is provided with an opening door which can be used for adding dry ice.

The outside of the dry ice box 4 is wrapped with a heat insulation material, the dry ice can sublimate at normal temperature, and in order to prevent the dry ice from being consumed too fast, the heat insulation material is used for reducing excessive heat exchange between the dry ice and hot air.

An exhaust pipe 5 is arranged at the upper end of the dry ice box 4, and after the dry ice absorbs heat and sublimates into carbon dioxide, the carbon dioxide is discharged outdoors from the exhaust pipe 5.

The lower end of the dry ice box 4 is provided with a water receiving disc 6 and a condensate pipe 7, and after hot air flows through the dry ice box 4, the generated condensate water flows into the water receiving disc 6 and is uniformly discharged through the condensate pipe 7.

The heat insulation material is wrapped outside the condensate pipe 7, so that condensate water is prevented from being generated again in the secondary heat exchange process of the air and the condensate pipe, and the normal operation of the cabinet is prevented from being influenced.

The fan 8 is positioned at the hot air inlet for generating air circulation power.

The working principle of the invention is as follows: the working process of the dry ice refrigerating system of the data center is as follows:

the hot air firstly reaches the dry ice heat exchange device under the action of the fan 8, the dry ice box 4 absorbs heat in the hot air, the air temperature is reduced, and simultaneously, the dry ice sublimates into carbon dioxide and is discharged from the exhaust pipe 5. Condensed water generated in the heat exchange process flows into the water receiving disc 6 and is discharged from the condensed water pipe 7. After the hot air exchanges heat with the dry ice, the hot air enters a closed cold channel and exchanges heat with the condensation water pipe 7 for the second time before entering the cabinet 1, so that the air temperature is further reduced. The cold air enters from the front end of the cabinet 1, after cooling the equipment, the temperature of the air rises, and the formed hot air is discharged to a hot channel from the rear end of the cabinet 1. The gas in the hot channel is sent to a dry ice heat exchange device by a fan 8 for heat exchange. And circulating in this way, cooling the data center cabinet.

It should be noted that, in the specific embodiment of the present invention, two cabinets are arranged in parallel, and a closed cold channel is formed in the middle to cool the cabinets. In the case of only one cabinet, the same can be used, and the position of the other cabinet is replaced by the heat-insulating partition plate. In addition, under the condition that a plurality of cabinets are arranged in parallel, a closed cold channel can be formed between cabinet columns, and a plurality of dry ice heat exchange devices are installed to meet the heat dissipation requirement. And carbon dioxide generated in different dry ice heat exchange devices is collected through the exhaust pipe and is uniformly discharged outdoors. And after the condensed water generated in the heat exchange process flows into the condensed water pipe, the condensed water is also uniformly collected and treated.

In the description of the present invention, unless otherwise indicated, the meaning of "a plurality" is two or more; the terms "upper," "lower," "left," "right," "inner," "outer," "front," "rear," "head," "tail," and the like are used as an orientation or positional relationship based on that shown in the drawings, merely to facilitate description of the invention and to simplify the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the invention. Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

The embodiment of the invention has a great advantage in the research and development or use process, and has the following description in combination with data, charts and the like of the test process.

According to the data center dry ice refrigerating system, the hot air of the data center is cooled through sublimation heat absorption of dry ice, and normal operation of the data center is guaranteed. The system has simple structure, no toxic or harmful substances, small occupied space and flexible installation. And carbon dioxide generated by sublimation of the dry ice is discharged outdoors by utilizing the exhaust pipe and is not directly emitted into the machine room, so that the safety of operation and maintenance personnel is ensured.

When the hot air exchanges heat with the dry ice box with lower temperature, condensed water can be generated. On the one hand, the air humidity is reduced. On the other hand, the collected condensed water can exchange heat with the air again, so that the cooling effect is enhanced. In addition, set up cold passageway as the cold passageway of closure, prevented cold air and hot air mixing to the cold source is placed in the cold passageway of closure, and roof and sealing door all adopt insulation material, prevent the cold volume loss, have strengthened the cooling effect.

In the refrigeration process, only the fan is powered to provide air circulation power, and other electric power is not needed. And the equipment such as a water chilling unit and an outdoor unit in the conventional cold source is reduced, and the noise influence is reduced.

The embodiment of the invention can also adopt the following optimizations which can be applied to the data center dry ice refrigerating system:

1) Optimizing the position of a fan: the fan is placed at the outlet of the cold channel, so that air circulation can be better promoted, cold air can quickly flow into the cabinet, and the refrigerating effect is improved.

2) Optimizing dry ice storage: the storage and management of dry ice can also be optimized, such as increasing the number of dry ice storage boxes, so that dry ice storage is more convenient and stable, and timing or quantitative addition can be performed according to the requirement.

3) Optimizing a heat insulation material: the heat-insulating material with higher efficiency is selected, so that the heat loss and the consumption of dry ice can be reduced, and the refrigeration efficiency is improved.

4) Optimizing the design of an exhaust pipe: the adjustable caliber and the opening degree are added into the exhaust pipe, so that the sublimation speed of the dry ice can be better controlled, the utilization efficiency of the dry ice is improved, and the consumption of the dry ice is reduced.

5) Optimizing a condensate water pipeline: the drainage device is added in the condensed water pipeline, so that condensed water can be better discharged, condensed water accumulation and water leakage are prevented, meanwhile, the influence of pipeline resistance and secondary heat exchange can be reduced, and the system efficiency and stability are improved.

6) An intelligent control system is adopted: through adopting intelligent control system, can be according to the inside temperature of rack, humidity isoparameter, automatically regulated dry ice's use amount and the rotational speed of fan to realize more accurate and efficient refrigeration effect.

7) Adopts multiple refrigeration technology: the dry ice refrigeration and other refrigeration technologies, such as compression refrigeration, absorption refrigeration and the like, can be considered to realize more efficient and energy-saving refrigeration effect, and meanwhile, the reliability and the adaptability of the refrigeration system can be improved.

The foregoing is merely illustrative of specific embodiments of the present invention, and the scope of the invention is not limited thereto, but any modifications, equivalents, improvements and alternatives falling within the spirit and principles of the present invention will be apparent to those skilled in the art within the scope of the present invention.

Claims

1. A data center dry ice refrigeration system, the data center dry ice refrigeration system comprising:

2. The data center dry ice refrigeration system of claim 1, wherein the closed cold aisle comprises cabinets, closed doors and top boards, the closed doors are installed in the middle of the front faces of adjacent cabinets, the top boards are installed at the upper ends of the cabinets, and the closed doors and the top boards are made of heat-insulating materials.

3. The data center dry ice refrigerating system as claimed in claim 1, wherein the dry ice heat exchanging device is arranged at the top of the cabinet and comprises a dry ice box and a fan, dry ice is stored in the dry ice box, an opening door is arranged at one side of the dry ice box, and two fans are respectively arranged at two ends of the closed cold channel.

4. The data center dry ice refrigeration system of claim 3, wherein the upper side and the side of the dry ice box are respectively communicated with an exhaust pipe and a condensate pipe, and the upper end of the exhaust pipe extends out from the upper side of the closed cold channel.

5. A data center dry ice refrigeration system as claimed in claim 3, wherein the dry ice box is provided with a drip tray at a lower end thereof.

6. A data center dry ice refrigeration system as claimed in claim 3, wherein the dry ice boxes are surrounded by insulating material.

7. A data center dry ice refrigeration system as claimed in claim 3, wherein the fan is located at the hot air inlet for generating air circulation power.

8. The data center dry ice refrigeration system of claim 4, wherein the condensed water pipe is surrounded by a thermal insulation material.

9. A control method for implementing a data center dry ice refrigeration system as claimed in any one of claims 1 to 8, wherein the control method of the data center dry ice refrigeration system comprises:

10. A data center system, wherein the data center system is equipped with a data center dry ice refrigeration system as claimed in any one of claims 1 to 8.