CN113739248A - Solar heat collection system for recycling waste heat of small and miniature data center - Google Patents

Solar heat collection system for recycling waste heat of small and miniature data center Download PDF

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Publication number
CN113739248A
CN113739248A CN202110846631.5A CN202110846631A CN113739248A CN 113739248 A CN113739248 A CN 113739248A CN 202110846631 A CN202110846631 A CN 202110846631A CN 113739248 A CN113739248 A CN 113739248A
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China
Prior art keywords
heat
collector
solar
data center
box body
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CN202110846631.5A
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Chinese (zh)
Inventor
吴雨暄
张晨达
林晓青
王舒弘
鲍源涛
邵伊琳
刘海博
叶子
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Zhejiang University ZJU
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Zhejiang University ZJU
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Priority to CN202110846631.5A priority Critical patent/CN113739248A/en
Publication of CN113739248A publication Critical patent/CN113739248A/en
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24DDOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
    • F24D15/00Other domestic- or space-heating systems
    • F24D15/04Other domestic- or space-heating systems using heat pumps
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24DDOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
    • F24D19/00Details
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24DDOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
    • F24D2200/00Heat sources or energy sources
    • F24D2200/12Heat pump
    • F24D2200/123Compression type heat pumps
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24DDOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
    • F24D2200/00Heat sources or energy sources
    • F24D2200/14Solar energy
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24DDOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
    • F24D2200/00Heat sources or energy sources
    • F24D2200/16Waste heat
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02BCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00Energy efficient heating, ventilation or air conditioning [HVAC]
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02BCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00Energy efficient heating, ventilation or air conditioning [HVAC]
    • Y02B30/12Hot water central heating systems using heat pumps

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Heat-Pump Type And Storage Water Heaters (AREA)

Abstract

The invention relates to the technical field of solar heat collecting devices, and aims to provide a solar heat collecting system for recycling waste heat of a small and miniature data center. The main body of the solar heat collector is a box body, and the upper opening of the box body is sealed by a transparent heat collector cover plate; the heat collecting plate is transversely arranged in the middle of the box body and is divided into an upper independent space and a lower independent space; the air inlet pipe is connected to the upper part of the upper compartment, and the air outlet pipe is connected to the lower part of the lower compartment; a plurality of through holes are uniformly distributed on the heat collecting plate; a plurality of parallel heat exchange tubes are arranged on the surface close to the lower side of the heat collection plate to form a reciprocating and returning heat exchange channel; the two ends of the heat exchange channel are respectively connected with the water inlet pipe and the water outlet pipe, and the water flow direction in the heat exchange channel is opposite to the gas flowing direction in the box body. Based on the characteristics of the data center, the invention achieves the purposes of heating buildings and domestic water by converting a large amount of low-grade hot air discharged by the data center into high-grade hot air, thereby reducing the heat supply energy consumption of the buildings and achieving the purposes of energy conservation and emission reduction.

Description

Solar heat collection system for recycling waste heat of small and miniature data center
Technical Field
The invention relates to the technical field of solar heat collecting devices, in particular to a solar heat collecting system for recycling waste heat of a small and miniature data center.
Background
Along with the rapid development of digital economy, digital centers are being built in great effort in countries around the world, and energy consumption is exponentially increased. With the development of science and technology, the number of unmanned automobiles, the internet of things and medical equipment is increased in the future, and more data centers are required. The development of data centers is immeasurable, and nowadays, the emission of the data centers exceeds the aviation industry, and the aviation industry is strictly regulated by a regulatory department. Therefore, the data center is also listed as a key supervision rank after a while, it is obviously infeasible to pay attention to economic benefits, and the waste heat recycling of the data center should draw attention;
the power consumption of the current global data center accounts for about 3% of the total amount, 82% of the cost of the data center is used for energy transmission and cooling, the total power consumption of the data center is estimated to be more than 1000TWh in 2025 years, and energy conservation, emission reduction and operation cost reduction face huge challenges.
The organic Rankine cycle waste heat recovery method commonly used in the industry needs a large amount of equipment and a huge field, the cost investment is large, and the recovery period is long. However, the waste heat generated by the small and miniature data center has low grade, the organic rankine cycle waste heat recovery method cannot provide a production idea, and the method cannot be applied due to cost reasons.
In order to process the waste heat of the data center in an environment-friendly, lasting and low-energy-consumption mode, a solar heat collecting system for recycling the waste heat of a small and miniature data center is provided.
Disclosure of Invention
The invention aims to solve the technical problem of overcoming the defects of the prior art and provides a solar heat collection system for recycling waste heat of a small and miniature data center.
In order to solve the technical problem, the solution of the invention is as follows:
the solar heat collector for recycling the waste heat of the small and miniature data center comprises a heat collecting plate coated with a solar heat absorption coating on the surface; the main body of the solar heat collector is a box body, and the upper opening of the box body is sealed by a transparent heat collector cover plate; the heat collecting plate is transversely arranged in the middle of the box body and divides the box body into an upper independent space and a lower independent space; the air inlet pipe is connected to the upper part of the upper compartment, and the air outlet pipe is connected to the lower part of the lower compartment; a plurality of through holes are uniformly distributed on the heat collecting plate and are used as passages for gas to flow from the upper compartment to the lower compartment; a plurality of parallel heat exchange tubes are arranged on the surface close to the lower side of the heat collecting plate, and the end parts of the heat exchange tubes are communicated by U-shaped tubes to form a heat exchange channel which is turned back and forth; the two ends of the heat exchange channel are respectively connected with the water inlet pipe and the water outlet pipe, and the water flow direction in the heat exchange channel is opposite to the gas flowing direction in the box body.
As the preferred scheme, an induced draft fan is arranged on the air outlet pipe. A CY180 centrifugal induced draft fan is selected.
Preferably, the bottom of the box body is provided with a fixing structure and a support. The support can be selected to be stainless steel.
As a preferred scheme, a heat preservation layer is arranged on the bottom surface inside the box body.
Preferably, the heat insulation layer is a rubber and plastic heat insulation plate, and the installation mode of the heat insulation layer parallel to the bottom plate of the box body can be selected.
Preferably, the collector cover plate is made of a transparent PC material, and the cross section of the collector cover plate is in a curved surface shape.
Preferably, the heat collecting plate has a fin structure with a zigzag-shaped undulation shape, and a longer side thereof serves as a main heat absorbing surface facing the sun.
Preferably, the solar heat absorption coating on the surface of the heat collection plate is a metal ceramic nanometer matrix solar heat absorption coating.
Preferably, the height of the front side plate of the box body is lower than that of the rear side plate, so that the heat collector cover plate has an inclination angle with a lower front part and a higher rear part, and the heat collecting plate has an inclination angle close to that of the heat collector cover plate.
The invention further provides a solar heat collection system for recycling waste heat of a small and miniature data center, which comprises the solar heat collector; the solar thermal collector is connected with an air compressor positioned in a data center through a gas conveying pipeline, and hot air discharged by the air compressor is sent to an air inlet pipe of the solar thermal collector; a branch is arranged on the gas conveying pipeline and connected to an air source heat pump; the water outlet of the solar heat collector is connected to the heat storage tank, and the air outlet pipe is connected to the warm exhaust channel.
Compared with the prior art, the invention can achieve the following beneficial effects:
based on the characteristics of the data center, the invention achieves the purposes of heating buildings and domestic water by converting a large amount of low-grade hot air discharged by the data center into high-grade hot air, thereby reducing the heat supply energy consumption of the buildings and achieving the purposes of energy conservation and emission reduction.
Drawings
FIG. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is a schematic side view of the present invention;
FIG. 3 is an enlarged schematic view of the invention at A of FIG. 1;
FIG. 4 is a schematic diagram of the workflow of the present invention;
wherein: 1, a heat collector cover plate; 2, a draught fan; 3, an air outlet pipe; 4, air inlet pipe; 5, a box body; 6 heat collecting plate; 7, fixing structure; 8, insulating layers; 9 water inlet; 10 water outlet. 11 a data center; 12 an air source heat pump; 13 an air compressor; 14 a first valve; 15 a second valve; 16 a heat storage tank; 17 warm exhaust channel; 18 a solar thermal collector; 19, feeding water; 20, discharging a water pipe; 21 gas delivery line.
Detailed Description
The present invention will be further described with reference to specific embodiments for the purpose of facilitating an understanding of technical means, characteristics of creation, objectives and functions realized by the present invention, but the following embodiments are only preferred embodiments of the present invention, and are not intended to be exhaustive. Based on the embodiments in the implementation, other embodiments obtained by those skilled in the art without any creative efforts belong to the protection scope of the present invention. The experimental methods in the following examples are conventional methods unless otherwise specified, and materials, reagents and the like used in the following examples are commercially available unless otherwise specified.
A solar heat collector 18 for recycling waste heat of a small micro data center is shown in fig. 1-3, wherein the main body of the solar heat collector 18 is a box body 5, and an opening at the upper part of the solar heat collector is sealed by a transparent heat collector cover plate 1; the bottom surface of the interior of the box body 5 is provided with a rubber and plastic heat insulation plate used as a heat insulation layer 8, and the bottom of the box body 5 is provided with a fixing structure 7 and a stainless steel support used for supporting. The collector cover plate 1 is made of transparent PC material and has a curved section. The height of the front side plate of the box body 5 is lower than that of the rear side plate, so that the heat collector cover plate 1 has an inclination angle with a low front and a high rear, and the heat collecting plate 6 has an inclination angle close to that of the heat collector cover plate. The heat collecting plate 6 has a fin structure with a zigzag-shaped undulation shape, and the longer side thereof serves as a main heat absorbing surface facing the sun; the surface of the heat collecting plate 6 is coated with a metal ceramic nanometer matrix solar heat absorption coating.
The heat collecting plate 6 is transversely installed in the middle of the tank 5 and divides the tank 5 into an upper and a lower independent spaces; the air inlet pipe 4 is connected to the upper part of the upper compartment, the air outlet pipe 3 is connected to the lower part of the lower compartment, and the air outlet pipe 3 is provided with a draught fan. A plurality of through holes are uniformly distributed on the heat collecting plate 6 and used as a passage for gas to flow from the upper compartment to the lower compartment; a plurality of parallel heat exchange tubes are arranged on the surface close to the lower side of the heat collecting plate 3, and the end parts of the heat exchange tubes are communicated by U-shaped tubes to form a reciprocating and turning-back heat exchange channel; the water inlet 9 and the water outlet 10 at the two ends of the heat exchange channel are respectively connected with the water inlet pipe 19 and the water outlet pipe 20, and the water flow direction in the heat exchange channel is opposite to the gas flowing direction in the box body.
A solar heat collection system for waste heat recovery of a small mini data center is shown in fig. 4. The solar heat collector 18 is connected with an air compressor 13 positioned in the data center 11 through a gas conveying pipeline 21, and hot air discharged by the air compressor 13 is sent to an air inlet pipe 4 of the solar heat collector; a branch is arranged on the gas conveying pipeline 21 and is connected to the air source heat pump 12; the water outlet 10 of the solar heat collector 18 is connected to the heat storage tank 16 through the water outlet pipe 20, and the air outlet pipe 3 is connected to the warm exhaust channel 17 through the induced draft fan 2. A first valve 14 is provided on the gas delivery line 21 at the outlet end of the air compressor 13, and a second valve 15 is provided on the branch to the air source heat pump 12.
Preferably, in the present invention:
the heat collector cover plate 1 can be selected as a PC transparent cover plate, the heat loss is less than that of the existing flat plate type toughened glass cover plate, and the improvement of the outlet hot gas temperature and the integral heat collection efficiency is facilitated. The curved surface design of the cover plate 1 of the heat collector is more matched with the heat collecting plate 6 arranged at an inclined angle, which is beneficial to improving the lighting area in unit building area. Meanwhile, the curved surface structure can enable the solar heat collection system to have stronger adaptability to the change of the solar radiation angle.
The heat collecting plate 6 with the surface coated with the metal ceramic nanometer substrate solar heat absorption coating has the function of efficiently fixing solar energy. The air firstly enters the cavity above the heat collecting plate 6 and then passes through the densely distributed small holes on the heat collecting plate 6 from top to bottom, so that the heat loss caused by the heat convection between the hot air and the heat collector cover plate 1 can be reduced. The design of the fin structure with the zigzag undulation shape can also strengthen the heat convection between the hot gas and the heat collecting plate 6, which is beneficial to improving the heat collecting efficiency.
Through setting the heat preservation 8 to the rubber and plastic heated board, can weaken the effect of heat transfer, be favorable to reducing the calorific loss of solar energy collection system main part bottom to improve collecting efficiency.
The heat exchange tubes are connected by the U-shaped tubes, so that the effect that one tube is communicated with water and a plurality of tubes are provided with water can be achieved. When the water supply source has a height difference, the water can flow from top to bottom by utilizing water flow, and water is drawn and flows out without additional power, and only the flow velocity of the water inlet 9 needs to be adjusted. This design does benefit to and adjusts according to the area in actual place, is convenient for realize the equipment of a plurality of solar energy collection systems, reduces product cost, improves collecting efficiency.
The rear bracket of the solar heat collector 18 is made of stainless steel, which is beneficial to prolonging the service life of the solar heat collector. The induced draft fan 2 is a CY180 centrifugal induced draft fan, so that the power is higher, the power consumption is less, and the energy conservation and emission reduction are facilitated.
Description of the operation mode:
the solar heat collection system has two heat sources in the operation process, wherein the two heat sources are respectively a solar radiation energy source and hot air discharged by an air compressor 13 of a data center 11, and are low-grade heat sources. The heat discharge mode of the solar heat collection system after heat collection is determined by the ambient temperature, the solar radiation intensity, the building heat supply requirement, and the temperature and the flow of the tube discharge hot air.
For example, during the daytime in summer, the data center cooling system is operating at high power, and the hot air flow and temperature are at a peak. At this time, the normal warm water flows in the water inlet pipe 19, the heat exchange channel and the water outlet pipe 20, so that the water starts to circularly flow in the solar heat collector 18, and a relative liquid-phase cold source is provided. The heat collecting plate 6 efficiently absorbs solar radiation, then the temperature is raised, and the heat energy absorbed by the heat collecting plate from the solar energy is transferred to the heat exchange channel at the back of the heat collector cover plate 1 through heat conduction to heat the liquid-phase cold source. Meanwhile, hot air from the data center 11 is introduced through the air inlet pipe 4, convection is enhanced through the plurality of through holes uniformly distributed on the heat collecting plate 6, and then heat carried by the hot air above the heat collecting plate 6 is subjected to convection heat transfer with a liquid-phase cold source in the heat exchange channel, so that the water temperature is further increased. After heat exchange is completed, hot water is sent to the heat storage tank through the water outlet pipe 20 and is used as domestic hot water.
In winter when a large amount of warm air is needed indoors, the invention on the water inlet pipe 19 can be closed, so that the solar heat collector 18 is focused on the recovery and heat collection of hot air. Although in winter, the cabinet heat dissipation of the data center 11 still requires the continuous operation of the cooling air conditioner. However, the ambient temperature is too low, which leads to a considerable heat loss if the hot air is fed directly to the solar collector 18 via the gas feed line 21. Thus, the second valve 15 can be opened and part of the hot air can be branched to the air-energy heat pump 12, in this way reducing the energy consumption for the operation of the air-energy heat pump 12. At this time, the solar collector 18 receives the cooled room temperature air. When a user needs hot air as a heat supply source, the induced draft fan 2 is started, so that the hot air is subjected to heat exchange by the heat collecting plate 6 and then is used for providing heating for the indoor space through the heating exhaust passage 17, and the heating function similar to that of a solar wall is achieved.
Based on the characteristics of the data center, the invention converts a large amount of low-grade hot air discharged by the system into high-grade hot air and hot water by the method so as to achieve the purposes of heating and supplying hot water for buildings, thereby reducing the heat supply energy consumption of the buildings and achieving the purposes of energy conservation and emission reduction.
By adopting the waste heat recovery process provided by the invention for a plurality of small micro data centers in Zhejiang, the average running power of the waste heat recovery process is about 378W. And the final result obtained by monitoring and calculating the data shows that: by using the invention, each small-sized data center can save 12171.5KWh of electric quantity in total each year, and the electric charge is reduced to about 8398.3 yuan (in terms of electric price of 0.69 yuan/meter). The standard coal discharge coefficient calculated by using the 1-degree electric conversion is 0.4(kg), the carbon dioxide discharge coefficient calculated by using the 1-degree electric conversion is 0.997(kg), and the annual standard coal saving amount is calculated to be 4.87 multiplied by 103kg, reducing carbon dioxide emission by 1.21 x 104kg。
In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and the preferred embodiments of the present invention are described in the above embodiments and the description, and are not intended to limit the present invention. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims (10)

1. A solar heat collector for recycling waste heat of a small and miniature data center comprises a heat collecting plate coated with a solar heat absorption coating on the surface, and is characterized in that the main body of the solar heat collector is a box body, and an opening at the upper part of the solar heat collector is sealed by a transparent heat collector cover plate; the heat collecting plate is transversely arranged in the middle of the box body and divides the box body into an upper independent space and a lower independent space; the air inlet pipe is connected to the upper part of the upper compartment, and the air outlet pipe is connected to the lower part of the lower compartment; a plurality of through holes are uniformly distributed on the heat collecting plate and are used as passages for gas to flow from the upper compartment to the lower compartment; a plurality of parallel heat exchange tubes are arranged on the surface close to the lower side of the heat collecting plate, and the end parts of the heat exchange tubes are communicated by U-shaped tubes to form a heat exchange channel which is turned back and forth; the two ends of the heat exchange channel are respectively connected with the water inlet pipe and the water outlet pipe, and the water flow direction in the heat exchange channel is opposite to the gas flowing direction in the box body.
2. A solar collector as claimed in claim 1, wherein an induced draft fan is provided on the outlet duct.
3. A solar collector as claimed in claim 1, wherein the bottom of the tank is provided with a fixing structure and a bracket.
4. A solar collector as claimed in claim 1, wherein the bottom surface of the interior of the box is provided with an insulating layer.
5. A solar collector as claimed in claim 4, wherein the insulating layer is a rubber-plastic insulating board.
6. A solar collector according to claim 1, wherein said collector cover is PC transparent and has a curved cross-section.
7. Solar collector according to claim 1, wherein said collector plate has a fin structure with a polygonal line-like undulation shape with its longer side as the primary heat absorbing surface facing the sun.
8. A solar collector as claimed in claim 1, wherein the solar heat absorbing coating on the surface of the collector plate is a metal ceramic nanomatrix solar heat absorbing coating.
9. A solar collector as claimed in claim 1, wherein the height of the front side plate of the box body is lower than the height of the rear side plate, so that the collector cover plate has an inclination angle with a lower front and a higher rear, and the collector plate has an inclination angle close to that of the collector cover plate.
10. A solar heat collection system for waste heat recovery and utilization of a small mini data center, which is characterized by comprising the solar heat collector in claim 1; the solar thermal collector is connected with an air compressor positioned in a data center through a gas conveying pipeline, and hot air discharged by the air compressor is sent to an air inlet pipe of the solar thermal collector; a branch is arranged on the gas conveying pipeline and connected to an air source heat pump; the water outlet of the solar heat collector is connected to the heat storage tank, and the air outlet pipe is connected to the warm exhaust channel.
CN202110846631.5A 2021-07-26 2021-07-26 Solar heat collection system for recycling waste heat of small and miniature data center Pending CN113739248A (en)

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Application publication date: 20211203