CN110595013A - Air conditioner refrigeration method and system for data center and data center - Google Patents

Air conditioner refrigeration method and system for data center and data center Download PDF

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Publication number
CN110595013A
CN110595013A CN201911010957.3A CN201911010957A CN110595013A CN 110595013 A CN110595013 A CN 110595013A CN 201911010957 A CN201911010957 A CN 201911010957A CN 110595013 A CN110595013 A CN 110595013A
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China
Prior art keywords
water
groups
air
cooling
parallel
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CN201911010957.3A
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Chinese (zh)
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李立华
陈丽君
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李立华
陈丽君
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Priority to CN201911010957.3A priority Critical patent/CN110595013A/en
Publication of CN110595013A publication Critical patent/CN110595013A/en
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24FAIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00Control or safety arrangements
    • F24F11/62Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
    • F24F11/63Electronic processing
    • F24F11/65Electronic processing for selecting an operating mode
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24FAIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F13/00Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
    • F24F13/28Arrangement or mounting of filters
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B41/00Fluid-circulation arrangements
    • F25B41/20Disposition of valves, e.g. of on-off valves or flow control valves
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B6/00Compression machines, plants or systems, with several condenser circuits
    • F25B6/02Compression machines, plants or systems, with several condenser circuits arranged in parallel
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B6/00Compression machines, plants or systems, with several condenser circuits
    • F25B6/04Compression machines, plants or systems, with several condenser circuits arranged in series

Abstract

The invention discloses an air-conditioning refrigeration method, an air-conditioning refrigeration system and a data center of the data center, wherein the refrigeration method comprises the following steps: switching between the following cooling modes: when the data center operates in summer, spring and summer transition seasons and summer and autumn transition seasons, the cooling water cooled by the cooling tower takes away the heat of the condenser of the water chilling unit; the chilled water of a plurality of groups of water chilling units connected in parallel or in series is sent into an air conditioning unit to exchange heat with air; when the data center operates in winter, refrigerant water prepared by cooling chilled water through a cooling tower is sent to a heat exchange unit to exchange heat with chilled water at the tail end of an air conditioner, and the chilled water after heat exchange is sent to the air conditioner unit to exchange heat with air. The air-conditioning refrigeration system comprises an air-conditioning unit, a heat exchange unit, at least two groups of cooling towers and at least two groups of water chilling units, the air-conditioning refrigeration system is connected with a circulating pump through a pipeline, and the refrigeration mode is switched through a valve on the pipeline. The data center comprises the air-conditioning refrigeration system, the refrigeration mode is switched according to the operation environment of the data center, the air-conditioning water energy is utilized to the maximum, and the energy is saved.

Description

Air conditioner refrigeration method and system for data center and data center
Technical Field
The invention relates to the field of data center heat dissipation, in particular to an air-conditioning refrigeration method, an air-conditioning refrigeration system and a data center of the data center.
Background
With the continuous development of the information industry and the social economy, the construction scale and the number of data centers are increasing at a high speed. The heat dissipation capacity of the data center is also rapidly increased, and in order to ensure the normal operation of the data center, a precise air conditioning system needs to be started all the year round to discharge the heat generated by the data center in the machine room.
With the increased competition of data centers and the increased operating cost, how to realize the energy saving of the air-conditioning cooling system is urgent. The existing air-conditioning cooling system is single in refrigeration mode, the temperature difference between supply water and return water of an air-conditioning system of a data center is designed according to the common civil temperature difference of 5 ℃, the small water temperature difference enables the water supply flow to be increased, and the energy consumption of water supply transmission and distribution is large.
In view of the problems of single refrigeration mode, high initial investment, high operating cost, high energy consumption and the like of the conventional air conditioning system for the data center, the energy conservation of the air conditioning system needs to be comprehensively considered, all the components of the air conditioning system need to be optimized, the total efficiency of the whole system is improved, and the initial investment is reduced.
Disclosure of Invention
The invention provides an air-conditioning refrigeration method of a data center, aiming at solving the problems of single refrigeration mode, high operation energy consumption, high initial investment, limited adjustability of refrigeration capacity and the like of the existing air-conditioning system.
In order to achieve the technical purpose, the invention discloses an air-conditioning refrigeration method of a data center, which switches among the following refrigeration modes:
a first cooling mode: when the data center operates in summer, spring and summer transition seasons and summer and autumn transition seasons, mechanical refrigeration is adopted, a plurality of groups of water chilling units are connected in parallel with one end of a plurality of groups of cooling towers, the plurality of groups of water chilling units are connected in parallel with one end of an air conditioning unit, cooling water cooled by the plurality of groups of cooling towers connected in parallel is sent into the plurality of groups of water chilling units connected in parallel through a cooling water circulating pump, the heat of condensers of the plurality of groups of water chilling units is taken away, and then the cooling water is sent back into the plurality of groups of cooling towers connected in parallel through the; the chilled water prepared by the multiple groups of water chilling units connected in parallel is sent into the air conditioning unit by the chilled water circulating pump to exchange heat with air in the data machine room, the chilled water after heat exchange enters the multiple groups of water chilling units connected in parallel again through the chilled water circulating pump to be refrigerated, and the refrigeration of the data center is realized by the circulation;
a second cooling mode: when the data center operates in summer, spring and summer transition seasons and summer and autumn transition seasons, mechanical refrigeration is adopted, a plurality of groups of water chilling units are connected in parallel with one end of a plurality of groups of cooling towers, the plurality of groups of water chilling units are connected in series with one end of an air conditioning unit, cooling water cooled by the plurality of groups of cooling towers connected in parallel is sent into the plurality of groups of water chilling units connected in parallel through a cooling water circulating pump, the heat of condensers of the plurality of groups of water chilling units is taken away, and then the cooling water is sent back into the plurality of groups of cooling towers connected in parallel through the; the chilled water prepared by the multiple groups of water chilling units connected in series is sent into the air conditioning unit by the chilled water circulating pump to exchange heat with air in the data machine room, the chilled water after heat exchange enters the multiple groups of water chilling units connected in series again through the chilled water circulating pump to be refrigerated, and the refrigeration of the data center is realized by the circulation;
a third cooling mode: when the data center operates in winter, a natural cold source is adopted to cool water in the cooling tower, refrigerant water prepared after the chilled water is cooled by the multiple groups of cooling towers which are connected in parallel is sent into the heat exchange unit through the cold water circulating pump to exchange heat with chilled water at the tail end of the air conditioner, the chilled water after heat exchange is sent into the air conditioning unit through the chilled water circulating pump to exchange heat with air in the data machine room, the chilled water after heat exchange enters the heat exchange unit again through the chilled water circulating pump to exchange heat, and the refrigeration of the data center is realized through the circulation.
On the other hand, the invention also provides an air-conditioning refrigeration system of the data center, which comprises a cooling water circulating pump, a chilled water circulating pump, a cold water circulating pump, an air-conditioning unit, a heat exchange unit, at least two groups of cooling towers and at least two groups of cold water units, wherein the multiple groups of cooling towers are connected in parallel, the multiple groups of cold water units are connected with one end of the multiple groups of cooling towers in parallel, the multiple groups of cold water units are connected with one end of the air-conditioning unit in parallel or in series, the multiple groups of water chilling units connected in parallel form a circulation loop with the multiple groups of cooling towers connected in parallel through pipelines and the cooling water circulating pump, a plurality of groups of water chilling units which are connected in parallel or in series form a circulating loop with the air conditioning unit through a pipeline and the chilled water circulating pump, a plurality of groups of cooling towers which are connected in parallel form a circulating loop with the heat exchanger unit through a pipeline and a cold water circulating pump, the heat exchanger unit and the air conditioner unit form a circulation loop through a pipeline and the chilled water circulating pump; valves are arranged on the pipelines, and the on-off of each circulation loop is realized through the opening and closing of the valves, so that the switching of the refrigeration modes of the air-conditioning refrigeration system is realized;
the air conditioning unit comprises a heat exchanger, the heat exchanger comprises a first surface cooler and a second surface cooler, the first surface cooler and the second surface cooler are connected in series, a water supply port of the first surface cooler is connected with a chilled water outlet of the water chilling unit, a water outlet of the first surface cooler is connected with a water inlet of the second surface cooler, a water return port of the second surface cooler is connected with a chilled water return port of the water chilling unit, a air return port of the air conditioning unit is connected with an air outlet of the data machine room, and an air supply port of the air conditioning unit is connected with an air inlet of the data machine room.
Furthermore, cooling water outlets of the multiple groups of cooling towers connected in parallel are connected with cooling water inlets of the multiple groups of water chilling units connected in parallel through a cooling water supply pipe, a fifth valve is arranged on the cooling water supply pipe, cooling water outlets of the multiple groups of water chilling units connected in parallel are connected with cooling water return ports of the multiple groups of cooling towers connected in parallel through cooling water return pipes, a fourth valve is arranged on the cooling water return pipe, and a cooling water circulating pump is arranged on the cooling water supply pipe;
the cooling water outlets of the cooling towers which are connected in parallel are connected with the refrigerant water inlets of the heat exchanger unit through refrigerant water supply pipes, the refrigerant water supply pipes are provided with sixth valves, the refrigerant water outlets of the heat exchanger unit are connected with the cooling water return ports of the cooling towers which are connected in parallel through refrigerant water return pipes, the refrigerant water return pipes are provided with seventh valves, and the refrigerant water supply pipes are provided with cold water circulating pumps;
chilled water outlets of the multiple groups of water chilling units which are connected in parallel or in series are connected with water supply ports of the air conditioning unit through chilled water supply pipes, tenth valves are arranged on the chilled water supply pipes, water return ports of the air conditioning unit are connected with chilled water return ports of the multiple groups of water chilling units which are connected in parallel or in series through chilled water return pipes, eleventh valves are arranged on the chilled water return pipes, and chilled water circulating pumps are arranged on the chilled water return pipes; the multiple groups of water chilling units connected with the air conditioning unit are switched to be connected in series or in parallel through valves among the multiple groups of water chilling units;
the water supply port of the air conditioning unit is connected with the chilled water outlet of the heat exchanger unit through the branch of the chilled water supply pipe, an eighth valve is arranged on the branch of the chilled water supply pipe, the water return port of the air conditioning unit is connected with the chilled water return port of the heat exchanger unit through the branch of the chilled water return pipe, a ninth valve is arranged on the branch of the chilled water return pipe, and the chilled water circulating pump is located between the air conditioning unit and the heat exchanger unit.
Furthermore, the first surface air cooler and the second surface air cooler form a Chinese character 'ba'.
Further, the first surface air cooler and the second surface air cooler respectively comprise a plurality of fins and a plurality of heat exchange tubes, the fins are arranged in parallel, and a plurality of heat exchange tubes are inserted into the fins in a penetrating mode.
Furthermore, the fins are flat sheets, and the heat exchange tube is a snake-shaped bent tube.
Further, a plurality of heat exchange pipes of the first surface cooler are connected with one another through U-shaped pipe joints, and a passage is formed by the plurality of heat exchange pipes; a plurality of heat exchange pipes of the second surface cooler are connected with one another through U-shaped pipe joints, and a passage is formed by the plurality of heat exchange pipes.
Furthermore, the water outlet of the first surface cooler is higher than the water supply inlet, and the water inlet of the second surface cooler is higher than the water return inlet.
Further, the air conditioning unit comprises an air return section, a filtering section, a heat exchange section and an air supply section which are sequentially connected, wherein a fan is arranged in the air return section, an air filter is arranged in the filtering section, and the heat exchanger is arranged in the heat exchange section.
The invention also provides a data center which comprises the air-conditioning refrigeration system.
The invention has the beneficial effects that:
(1) compared with the prior art, the air-conditioning refrigeration method for the data center has multiple refrigeration modes, and can switch the refrigeration modes, namely the cold source cooling mode, according to the operating environment of the data center, so that the utilization rate of energy in air-conditioning water is improved, and energy is saved; and the multiple groups of water chilling units are connected in parallel or in series, so that the air conditioning water is utilized in a gradient manner, the energy contained in the air conditioning water is utilized to the maximum extent, and the energy utilization rate is improved.
(2) The heat exchanger of the air-conditioning refrigeration system comprises two surface coolers which are connected in series, the temperature difference between water supply and return is increased, and the temperature difference between water supply and return can be 6-15 ℃.
(3) The air-conditioning refrigeration system provided by the invention has the advantages that the temperature difference between the supply water and the return water is increased, the flow of air-conditioning water is reduced, the power consumption for conveying the air-conditioning water is reduced, the initial investment of a project and the operation cost of the system are reduced, and the efficiency and the energy conservation of the whole system are improved.
Drawings
Fig. 1 is a schematic structural diagram of an air conditioning and refrigerating system.
Fig. 2 is a schematic configuration diagram of the first cooling mode.
Fig. 3 is a schematic diagram of a second cooling mode.
Fig. 4 is a schematic diagram of a third cooling mode.
Fig. 5 is a schematic structural diagram of a heat exchanger.
Fig. 6 is a front view of the first surface cooler.
Fig. 7 is a rear view of the first surface cooler.
In the figure, the position of the upper end of the main shaft,
1. a data machine room; 2. an air conditioner room; 11. returning air; 12. air supply; 30. a fan; 40. an air filter; 50. a heat exchanger; 101. a first water chiller; 101' and a second water chilling unit; 102. a first cooling tower; 102', a second cooling tower; 103. a heat exchanger unit; 104. a cooling water circulation pump; 105. a cold water circulation pump; 106. a chilled water circulation pump; 107. an air conditioning unit; 201. a first valve; 202. a second valve; 203. a third valve; 301. a fourth valve; 301', a fifth valve; 302. a sixth valve; 302', a seventh valve; 303', an eighth valve; 303. a ninth valve; 304', a tenth valve; 304. an eleventh valve; 501. a first surface air cooler; 501' and a second surface cooler; 502. a water supply port; 503. a water outlet; 504. a water inlet; 505. a water return port; 601. a cooling water return pipe; 601', a cooling water supply pipe; 602', a chilled water supply pipe; 602. a chilled water return pipe; 6020' branch of chilled water supply line; 6020. a branch of a chilled water return pipe; 603. a coolant water supply pipe; 603', a refrigerant water return pipe; 5010. a fin; 5011. a heat exchange pipe; 5012. a U-shaped pipe joint; 1071. a return air section; 1072. a filtration section; 1073. a heat exchange section; 1074. and an air supply section.
Detailed Description
The air-conditioning refrigeration method, the air-conditioning refrigeration system and the data center provided by the invention are explained and explained in detail below with reference to the attached drawings of the specification.
The data center related to the invention is a complex set of facilities, which not only comprises a computer system and other matched equipment (such as a communication and storage system), but also comprises redundant data communication connection related equipment, environment control equipment, monitoring equipment and various safety devices, and the devices are required to work at proper temperature; however, when the data center is in operation, each device may generate more or less heat, and the heat may affect the normal operation of the data center.
As shown in fig. 1, the embodiment specifically discloses an air-conditioning refrigeration system for a data center, which includes a cooling water circulation pump 104, a chilled water circulation pump 106, a cold water circulation pump 105, an air-conditioning unit 107, a heat exchange unit 103, at least two groups of cooling towers and at least two groups of cold water units, wherein the multiple groups of cooling towers are connected in parallel, and the multiple groups of cooling towers simultaneously provide cooling water, thereby improving the working efficiency and increasing the utilization rate of energy in the cooling water; the two groups of water chilling units are taken as an example, as shown in fig. 1, when a first valve 201 and a second valve 202 are opened and a third valve 203 is closed, a first water chilling unit 101 and a second water chilling unit 101' are connected in parallel; when the third valve 203 is opened and the first valve 201 and the second valve 202 are closed, the first water chilling unit 101 and the second water chilling unit 101' are connected in series to perform stepped cooling on chilled water. The water chilling units can independently operate when the system operates, and the air-conditioning refrigeration system can produce chilled water with different temperatures by the operation modes of connecting various water chilling units. When the cold load of the air-conditioning refrigeration system is reduced or one group of water chilling units in the system breaks down, the independent operation of a single machine with large temperature difference can be realized.
The cooling water outlets of the multiple groups of cooling towers connected in parallel are connected with the cooling water inlets of the multiple groups of water chilling units connected in parallel through a cooling water supply pipe 601 ', the cooling water supply pipe 601' is provided with a fifth valve 301 ', the cooling water outlets of the multiple groups of water chilling units connected in parallel are connected with the cooling water return ports of the multiple groups of cooling towers connected in parallel through a cooling water return pipe 601, the cooling water return pipe 601 is provided with a fourth valve 301, and the cooling water supply pipe 601' is provided with a cooling water circulating pump 104; the multiple groups of water chilling units connected in parallel and the multiple groups of cooling towers connected in parallel form a circulation loop, cooling water cooled by the multiple groups of cooling towers connected in parallel flows through a cooling water supply pipe 601' by a cooling water circulating pump 104 and is sent into the multiple groups of water chilling units connected in parallel, heat of condensers of the water chilling units is taken away, and then the cooling water flows through a cooling water return pipe 601 by the cooling water circulating pump 104 and is sent back into the multiple groups of cooling towers connected in parallel for cooling again.
The cooling water outlets of the cooling towers which are connected in parallel are connected with the refrigerant water inlets of the heat exchange unit 103 through a refrigerant water supply pipe 603, a sixth valve 302 is arranged on the refrigerant water supply pipe 603, the refrigerant water outlets of the heat exchange unit 103 are connected with the cooling water return ports of the cooling towers which are connected in parallel through a refrigerant water return pipe 603 ', a seventh valve 302 ' is arranged on the refrigerant water return pipe 603 ', and a cold water circulating pump 105 is arranged on the refrigerant water supply pipe 603; the multiple groups of cooling towers connected in parallel and the heat exchanger unit 103 form a circulation loop, and refrigerant water prepared after the chilled water is cooled by the multiple groups of cooling towers flows through a refrigerant water supply pipe 603 by a cold water circulation pump 105 and is sent into the heat exchanger unit 103 to exchange heat with the chilled water at the tail end of the air conditioner.
Chilled water outlets of the multiple groups of water chilling units connected in parallel or in series are connected with a water supply port 502 of the air conditioning unit 107 through a chilled water supply pipe 602 ', a tenth valve 304 ' is arranged on the chilled water supply pipe 602 ', a water return port 505 of the air conditioning unit 107 is connected with chilled water return ports of the multiple groups of water chilling units connected in parallel or in series through a chilled water return pipe 602, an eleventh valve 304 is arranged on the chilled water return pipe 602, and a chilled water circulating pump 106 is arranged on the chilled water return pipe 602; the multiple groups of water chilling units connected with the air conditioning unit 107 are switched to be connected in series or in parallel through valves among the multiple groups of water chilling units; the multiple sets of water chilling units connected in parallel or in series and the air conditioning unit 107 form a circulation loop, chilled water produced by the water chilling units is sent into the air conditioning unit 107 through a chilled water supply pipe 602' by a chilled water circulation pump 106 to exchange heat with air in the data room 1, and the chilled water after heat exchange enters the water chilling unit again for refrigeration through a chilled water return pipe 602 by the chilled water circulation pump 106.
The water supply port 502 of the air conditioning unit 107 is connected with the chilled water outlet of the heat exchanger unit 103 through a branch 6020 'of a chilled water supply pipe 602', an eighth valve 303 'is arranged on the branch 6020' of the chilled water supply pipe, the water return port 505 of the air conditioning unit 107 is connected with the chilled water return port of the heat exchanger unit 103 through a branch 6020 of a chilled water return pipe 602, a ninth valve 303 is arranged on the branch 6020 of the chilled water return pipe, and the chilled water circulating pump 106 is positioned between the air conditioning unit 107 and the heat exchanger unit 103; the heat exchange unit 103 and the air conditioning unit 107 form a circulation loop; the chilled water after heat exchange of the heat exchanger unit 103 is sent into the air conditioner unit 107 through the chilled water circulating pump 106 via the branch 6020' of the chilled water supply pipe to exchange heat with the air in the data room 1, and the chilled water after heat exchange enters the heat exchanger unit 103 again for heat exchange via the chilled water circulating pump 106 via the branch 6020 of the chilled water return pipe.
Based on the circulation loops, the air-conditioning refrigeration system provided by the invention has multiple refrigeration modes, the refrigeration modes are switched by controlling the opening and closing of the valves and the water pumps on the circulation loops, each refrigeration mode comprises two circulation loops, and the refrigeration modes can be switched according to the operating environment of the data center. Taking two groups of cooling towers, namely a first cooling tower 102 and a second cooling tower 102 ', and two groups of refrigerating units, namely a first refrigerating unit 101 and a second refrigerating unit 101', as an example, the air-conditioning refrigeration method of the data center comprises the following steps:
as shown in fig. 2, the first cooling mode: when the data center operates in summer, spring and summer transition seasons and summer and autumn transition seasons, mechanical refrigeration is adopted, the first valve 201 and the second valve 202 are opened, the third valve 203 is closed, the first and second refrigerating units 101 and 101 'are connected in parallel with one end of the air conditioning unit 107, the fourth valve 301, the fifth valve 301', the tenth valve 304 'and the eleventh valve 304 are opened, the sixth valve 302, the seventh valve 302', the eighth valve 303 'and the ninth valve 303 are closed, and the first and second water chilling units 101 and 101' connected in parallel form a circulation loop with the first and second cooling towers 102 and 102 'connected in parallel through the cooling water supply pipe 601', the cooling water return pipe 601 and the cooling water circulation pump 104, the first water chiller 101 and the second water chiller 101 'which are connected in parallel form a circulation loop with the air conditioning unit 107 through a chilled water supply pipe 602', a chilled water return pipe 602 and a chilled water circulation pump 106; cooling water cooled by the first cooling tower 102 and the second cooling tower 102 'is sent into the first water chiller 101 and the second water chiller 101' which are connected in parallel through the cooling water circulating pump 104, takes away heat of condensers of the first water chiller 101 and the second water chiller 101 ', and then flows through the cooling water return pipe 601 to be sent back into the first cooling tower 102 and the second cooling tower 102' for cooling again; chilled water prepared by the first water chiller 101 and the second water chiller 101 ' is sent into the air conditioning unit 107 through a chilled water supply pipe 602 ' to exchange heat with air in the data room 1, the chilled water after heat exchange flows through the chilled water return pipe 602 through the chilled water circulating pump 106 to enter the first water chiller 101 and the second water chiller 101 ' again for refrigeration, and the refrigeration and heat dissipation of the data center are realized through circulation.
As shown in fig. 3, the second cooling mode: when the data center operates in summer, spring and summer transition seasons and summer and autumn transition seasons, mechanical refrigeration is adopted, the third valve 203 is opened, the first valve 201 and the second valve 202 are closed, the first refrigerating unit 101 and the second refrigerating unit 101 'are connected with one end of the air conditioning unit 107 in series, chilled water is utilized in a gradient mode, the fourth valve 301, the fifth valve 301', the tenth valve 304 'and the eleventh valve 304 are opened, the sixth valve 302, the seventh valve 302', the eighth valve 303 'and the ninth valve 303 are closed, the first water chilling unit 101 and the second water chilling unit 101' which are connected in parallel form a circulation loop with the first cooling tower 102 and the second cooling tower 102 'which are connected in parallel through the chilled water supply pipe 601', the chilled water return pipe 601 and the chilled water circulation pump 104, the first water chilling unit 101 and the second water chilling unit 101 'which are connected in series form a circulation loop with the air conditioning unit 107 through the chilled water supply pipe 602', the chilled water return pipe 602 and the chilled water circulation pump 106, cooling water cooled by the first cooling tower 102 and the second cooling tower 102 'is sent into the first water chilling unit 101 and the second water chilling unit 101' through the cooling water circulating pump 104, takes away heat of condensers of the first water chilling unit 101 and the second water chilling unit 101 ', and then flows back into the first cooling tower 102 and the second cooling tower 102' through the cooling water return pipe 601 to be cooled again; the chilled water prepared by the first water chilling unit 101 and the second water chilling unit 101 ' is sent into the air conditioning unit 107 through the chilled water supply pipe 602 ' to exchange heat with the air in the data room 1, the chilled water after heat exchange flows through the chilled water return pipe 602 to enter the first water chilling unit 101 and the second water chilling unit 101 ' connected in series again to be refrigerated, and the refrigeration and heat dissipation of the data center are realized in such a circulating manner.
When the water-cooling system operates in the transition seasons of spring and summer and autumn in summer, the second operation mode is more preferable, the cascade utilization of the cooling water can be realized, and more energy sources are saved.
As shown in fig. 4, the third cooling mode: when the data center operates in winter, a natural cold source is used for cooling water in the cooling tower, the fourth valve 301, the fifth valve 301 ', the tenth valve 304' and the eleventh valve 304 are closed, the sixth valve 302, the seventh valve 302 ', the eighth valve 303' and the ninth valve 303 are opened, the first cooling tower 102 and the second cooling tower 102 'which are connected in parallel form a circulation loop with the heat exchanger unit 103 through the refrigerant water supply pipe 603, the refrigerant water return pipe 603' and the cold water circulating pump 105, and the heat exchanger unit 103 forms a circulation loop with the air conditioner unit 107 through the branch 6020 'of the refrigerant water supply pipe 602', the branch 6020 of the refrigerant water return pipe 602 and the chilled water circulating pump 106; chilled water prepared after being cooled by a first cooling tower 102 and a second cooling tower 102 ' which are connected in parallel flows through a chilled water supply pipe 603 through a chilled water circulating pump 105 and is sent into a heat exchanger unit 103 to exchange heat with chilled water at the tail end of an air conditioner, the chilled water after heat exchange flows through a branch 6020 ' of a chilled water supply pipe 602 ' through a chilled water circulating pump 106 and is sent into the air conditioner unit 107 to exchange heat with air in a data machine room 1, the chilled water after heat exchange flows through a branch 6020 of a chilled water return pipe 602 through the chilled water circulating pump 106 and enters the heat exchanger unit 103 again to exchange heat, and the refrigeration and heat dissipation of a data center are realized through circulation.
The switching among the refrigeration modes fully utilizes the energy of the air conditioning water, improves the energy utilization rate, and is energy-saving and environment-friendly.
As shown in fig. 1 to 5, the air conditioning unit 107 includes a heat exchanger 50, the heat exchanger 50 includes a first surface cooler 501 and a second surface cooler 501 ', the first surface cooler 501 and the second surface cooler 501' are connected in series, a water supply port 502 of the first surface cooler 501 is connected to a chilled water supply pipe 602 ', a water outlet 503 of the first surface cooler 501 is connected to a water inlet 504 of the second surface cooler 501', a water return port 505 of the second surface cooler 501 'is connected to the chilled water return pipe 602, the water outlet 503 of the first surface cooler 501 is higher than the water supply port 502, the water inlet 504 of the second surface cooler 501' is higher than the water return port 505, hatched arrows indicate air flow directions, solid arrows indicate water flow directions, and a mixed air flow direction and a water flow direction are different from each other, so as to improve a heat exchange effect and a temperature difference water supply and return effect of the air conditioning and refrigeration system in the data center, and achieve a maximum. The return air inlet of the air conditioning unit 107 is connected with the air outlet of the data machine room 1, and the air supply outlet of the air conditioning unit 107 is connected with the air inlet of the data machine room 1.
The return port 505 of the second surface cooler 501' may also be used as a water supply port connected to a chilled water supply pipe, and correspondingly, the water supply port 502 of the first surface cooler 501 may be used as a return port connected to a chilled water return pipe.
The first surface cooler 501 and the second surface cooler 501 'form a shape like a Chinese character' ba ', namely, the first surface cooler 501 and the second surface cooler 501' are inclined at a certain angle, so that the contact area with air is increased, and the heat exchange efficiency is improved.
When the air is subjected to heat exchange through the first surface air cooler, the dehumidification function can be realized simultaneously except that the temperature of indoor circulating air is reduced by the same principle as that of the conventional air conditioner, the water supply temperature of the second surface air cooler is 12 ℃, and the energy in the chilled water is utilized again by carrying out heat exchange with the air in the data machine room again.
When the air-conditioning refrigeration system is designed, the basic calculation formula of the flow of the chilled water circulating pump and the flow of the cooling water circulating pump is as follows:
Q=CGΔt
wherein Q is the design air conditioning load; c is the specific heat of water; g is air conditioner water flow; delta t is the temperature difference of supply water and return water of the designed air conditioner;
the flow of the chilled water circulating pump and the flow of the cooling water circulating pump of the air conditioning water obtained by the above formula are in inverse proportion to the temperature difference of the supplied water and the returned water;
when the air conditioning system is designed, the water flow calculation formula of the air conditioning system is as follows:
wherein G is air conditioner water flow; q is the design air conditioning load; delta t is the temperature difference of supply water and return water of the designed air conditioner;
knowing that the flow rate is inversely proportional to the temperature difference, for the same load, the required water amount is 1/2 when the temperature difference is doubled;
when the two water pumps convey fluid and the rotating speeds are the same, the relationship among the pump lift H, the flow G and the power N of the water pumps is as follows:
in the formula: h and H' respectively represent the water pump lifts before and after the temperature difference of the chilled water is changed; g and G' are the flow of the water pump before and after the temperature difference of the chilled water is changed; n and N' are the water pump power before and after the temperature difference of the chilled water is changed;
when in useWhen Δ N ═ N' -N ═ (1-0.315) N ═ 0.685 can be obtained; therefore, the power saving rate of the power consumed by the air-conditioning chilled water in the pipeline reaches about 68 percent, the specification of the system pipeline is correspondingly reduced, and the capacity and initial investment of a water pump are obviously reduced.
The first surface cooler 501 and the second surface cooler 501' each include a plurality of fins 5010 and a plurality of heat exchange tubes 5011, the plurality of fins 5010 are arranged in parallel, and each fin 5010 is inserted with the plurality of heat exchange tubes 5011. The fins 5010 are flat fins, and the heat exchange tube 5011 is a serpentine bent tube. As shown in fig. 6, the plurality of heat exchange tubes 506 may be arranged on the fins 501 in parallel, or in partial longitudinal direction, as shown in fig. 7, the plurality of heat exchange tubes of the first surface cooler 501 are connected to each other through U-shaped pipe joints 5012, and form a passage, and the plurality of heat exchange tubes of the second surface cooler 501' are connected to each other through U-shaped pipe joints 5012, and form a passage, so that the flow path of the chilled water is lengthened, thereby increasing the temperature difference of the supplied and returned water. The air flowing through the surface air cooler is cooled by the chilled water flowing in the heat exchange pipe 5011, so that the purpose of cooling is achieved. When the air is subjected to heat exchange through the first surface air cooler, the principle of the heat exchange is the same as that of a conventional air conditioner, the second surface air cooler and the air are subjected to heat exchange again to reuse the energy in the chilled water, the cascade utilization of the energy is realized, the temperature difference for adjusting an air-conditioning refrigeration system of a data center is increased, and the temperature difference of the chilled water can reach 6-15 ℃. Thereby supply the return water difference in temperature increase to reduce the circulating water yield, reduce the specification of selecting for use of supply return water pipeline in data center's the air conditioning refrigeration system, the pipe diameter of pipeline reduces, corresponds the water pump energy consumption simultaneously and reduces initial investment and operation energy consumption.
Air conditioning unit 107 is equipped with fan 30 in the return air section 1071 including the return air section 1071, fillter section 1072, heat transfer section 1073 and the air supply section 1074 that connect gradually, is equipped with air cleaner 40 in the fillter section 1072, is equipped with heat exchanger 50 in the heat transfer section 1073. The return air inlet of the air conditioning unit 107 is connected with the air outlet of the data machine room 1, and the air supply outlet of the air conditioning unit 107 is connected with the air inlet of the data machine room 1. Data computer lab 1's return air 11 is the air return section 1071 that shutter on data computer lab 1 and the 2 partition walls of air conditioner room got into air conditioning unit 107 through data computer lab 1's air exit, send into the fillter 1072 through fan 30 in the air return section 1071, the air cleaner 40 of 1072 filters the air, the pure air after the filtration gets into heat-transfer section 1073 and heat exchanger 50 and carries out the heat transfer cooling, the air supply 12 after the cooling sends into in data computer lab 1 through the air intake of data computer lab 1 of air supply section 1074 flow through, cool down the heat dissipation to data center.
The air filter 40 includes a primary air filter and a secondary air filter which are connected in sequence, the primary air filter is a plate-type primary air filter, and the secondary air filter is a bag-type secondary air filter. Return air 11 filters through primary air cleaner and well effect air cleaner in proper order, filters particles such as dust and impurity in the detached air, and pure air gets into the heat transfer section and carries out the heat transfer cooling, improves the cleanliness factor of air.
The invention also provides a data center which comprises the air-conditioning refrigeration system.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the invention.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the description herein, references to the description of the term "the present embodiment," "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and simplifications made in the spirit of the present invention are intended to be included in the scope of the present invention.

Claims (10)

1. An air-conditioning refrigeration method of a data center is characterized in that: switching between the following cooling modes:
a first cooling mode: when the data center operates in summer, spring and summer transition seasons and summer and autumn transition seasons, mechanical refrigeration is adopted, a plurality of groups of water chilling units are connected in parallel with one end of a plurality of groups of cooling towers, the plurality of groups of water chilling units are connected in parallel with one end of an air conditioning unit, cooling water cooled by the plurality of groups of cooling towers connected in parallel is sent into the plurality of groups of water chilling units connected in parallel through a cooling water circulating pump (104), heat of condensers of the plurality of groups of water chilling units is taken away, and then the cooling water is sent back into the plurality of groups of cooling towers connected in parallel through the cooling water circulating pump (; chilled water prepared by a plurality of groups of water chilling units connected in parallel is sent into an air conditioning unit (107) by a chilled water circulating pump (106) to exchange heat with air in a data machine room (1), the chilled water after heat exchange enters the plurality of groups of water chilling units connected in parallel again through the chilled water circulating pump (106) to refrigerate, and the refrigeration of a data center is realized by the circulation;
a second cooling mode: when the data center operates in summer, spring and summer transition seasons and summer and autumn transition seasons, mechanical refrigeration is adopted, a plurality of groups of water chilling units are connected in parallel with one end of a plurality of groups of cooling towers, the plurality of groups of water chilling units are connected in series with one end of an air conditioning unit, cooling water cooled by the plurality of groups of cooling towers connected in parallel is sent into the plurality of groups of water chilling units connected in parallel through a cooling water circulating pump (104), heat of condensers of the plurality of groups of water chilling units is taken away, and then the cooling water is sent back into the plurality of groups of cooling towers connected in parallel through the cooling water circulating pump (; chilled water prepared by the multiple groups of water chilling units connected in series is sent into the air conditioning unit (107) through the chilled water circulating pump (106) to exchange heat with air in the data machine room (1), the chilled water after heat exchange enters the multiple groups of water chilling units connected in series again through the chilled water circulating pump (106) to be refrigerated, and the refrigeration of the data center is realized through the circulation;
a third cooling mode: when the data center operates in winter, a natural cold source is adopted to cool water in the cooling tower, refrigerant water prepared after chilled water is cooled by multiple groups of cooling towers connected in parallel is sent into the heat exchange unit (103) through the cold water circulating pump (105) to exchange heat with chilled water at the tail end of the air conditioner, the chilled water after heat exchange is sent into the air conditioning unit (107) through the chilled water circulating pump (106) to exchange heat with air in the data machine room (1), the chilled water after heat exchange enters the heat exchange unit (103) again through the chilled water circulating pump (106) to exchange heat, and the refrigeration of the data center is realized through the circulation.
2. An air conditioning refrigeration system of a data center is characterized in that: the air-conditioning refrigeration system comprises a cooling water circulating pump (104), a chilled water circulating pump (106), a cold water circulating pump (105), an air-conditioning unit (107), a heat exchange unit (103), at least two groups of cooling towers and at least two groups of cold water units, wherein the groups of cooling towers are connected in parallel, the groups of cold water units are connected in parallel with one end of the groups of cooling towers, the groups of cold water units are connected in parallel or in series with one end of the air-conditioning unit, the multiple groups of water chilling units connected in parallel form a circulation loop with the multiple groups of cooling towers connected in parallel through pipelines and the cooling water circulating pump (104), a plurality of groups of water chilling units which are connected in parallel or in series form a circulating loop with the air conditioning unit (107) through a pipeline and the chilled water circulating pump (106), a plurality of groups of cooling towers which are connected in parallel form a circulating loop with the heat exchanger unit (103) through a pipeline and a cold water circulating pump (105), the heat exchanger unit (103) and the air conditioner unit (107) form a circulation loop through a pipeline and the chilled water circulation pump (106); valves are arranged on the pipelines, and the on-off of each circulation loop is realized through the opening and closing of the valves, so that the switching of the refrigeration modes of the air-conditioning refrigeration system is realized;
the air conditioning unit (107) comprises a heat exchanger (50), the heat exchanger (50) comprises a first surface cooler (501) and a second surface cooler (501 '), the first surface cooler (501) and the second surface cooler (501') are connected in series, a water supply port (502) of the first surface cooler (501) is connected with a chilled water outlet of the water chilling unit, a water outlet (503) of the first surface cooler (501) is connected with a water inlet (504) of the second surface cooler (501 '), a water return port (505) of the second surface cooler (501') is connected with a chilled water return port of the water chilling unit, a return air port of the air conditioning unit (107) is connected with an air outlet of the data machine room (1), and an air supply port of the air conditioning unit (107) is connected with an air inlet of the data machine room (1).
3. An air conditioning refrigeration system as set forth in claim 2 wherein: the cooling water outlet of the multiple groups of cooling towers connected in parallel is connected with the cooling water inlet of the multiple groups of water chilling units connected in parallel through a cooling water supply pipe (601 '), a fifth valve (301') is arranged on the cooling water supply pipe (601 '), the cooling water outlet of the multiple groups of water chilling units connected in parallel is connected with the cooling water return port of the multiple groups of cooling towers connected in parallel through a cooling water return pipe (601), a fourth valve (301) is arranged on the cooling water return pipe (601), and a cooling water circulating pump (104) is arranged on the cooling water supply pipe (601');
cooling water outlets of a plurality of groups of cooling towers connected in parallel are connected with a refrigerant water inlet of the heat exchanger unit (103) through a refrigerant water supply pipe (603), a sixth valve (302) is arranged on the refrigerant water supply pipe (603), a refrigerant water outlet of the heat exchanger unit (103) is connected with cooling water return ports of the plurality of groups of cooling towers connected in parallel through a refrigerant water return pipe (603 '), a seventh valve (302 ') is arranged on the refrigerant water return pipe (603 '), and a cold water circulating pump (105) is arranged on the refrigerant water supply pipe (603);
chilled water outlets of a plurality of groups of water chilling units which are connected in parallel or in series are connected with a water supply port (502) of the air conditioning unit (107) through a chilled water supply pipe (602 '), a tenth valve (304 ') is arranged on the chilled water supply pipe (602 '), a water return port (505) of the air conditioning unit (107) is connected with chilled water return ports of the plurality of groups of water chilling units which are connected in parallel or in series through a chilled water return pipe (602), an eleventh valve (304) is arranged on the chilled water return pipe (602), and a chilled water circulating pump (106) is arranged on the chilled water return pipe (602); the multiple groups of water chilling units connected with the air conditioning unit (107) are switched to be connected in series or in parallel through valves among the multiple groups of water chilling units;
the water supply port (502) of the air conditioning unit (107) is connected with the chilled water outlet of the heat exchanger unit (103) through a branch (6020 ') of the chilled water supply pipe (602'), an eighth valve (303 ') is arranged on the branch (6020') of the chilled water supply pipe, the water return port (505) of the air conditioning unit (107) is connected with the chilled water return port of the heat exchanger unit (103) through the branch (6020) of the chilled water return pipe (602), a ninth valve (303) is arranged on the branch (6020) of the chilled water return pipe, and the chilled water circulating pump (106) is positioned between the air conditioning unit (107) and the heat exchanger unit (103).
4. An air conditioning refrigeration system as set forth in claim 3 wherein: the first surface cooler (501) and the second surface cooler (501 ') form a Chinese character ' ba '.
5. An air conditioning refrigeration system according to claim 2 or 4 wherein: the first surface cooler (501) and the second surface cooler (501') respectively comprise a plurality of fins (5010) and a plurality of heat exchange tubes (5011), the fins (5010) are arranged in parallel, and the heat exchange tubes (5011) are inserted into the fins (5010) in a penetrating mode.
6. An air conditioning refrigeration system as set forth in claim 5 wherein: the fin (5010) is a flat sheet, and the heat exchange tube (5011) is a snake-shaped bent tube.
7. An air conditioning refrigeration system as set forth in claim 6 wherein: a plurality of heat exchange pipes (5011) of the first surface cooler (501) are connected with each other through U-shaped pipe joints, and form a passage; a plurality of heat exchange pipes (5011) of the second surface cooler (501') are connected with each other through U-shaped pipe joints, and the plurality of heat exchange pipes form a passage.
8. An air conditioning refrigeration system as set forth in claim 2 wherein: the water outlet (503) of the first surface cooler (501) is higher than the water supply inlet (502), and the water inlet (504) of the second surface cooler (501') is higher than the water return inlet (505).
9. An air conditioning refrigeration system as set forth in claim 2 wherein: air conditioning unit (107) are including return air section (1071), fillter section (1072), heat transfer section (1073) and the air supply section (1074) that connect gradually, be equipped with fan (30) in return air section (1071), be equipped with air cleaner (40) in fillter section (1072), be equipped with in heat transfer section (1073) heat exchanger (50).
10. A data center, characterized by: an air conditioning and refrigeration system comprising any of claims 2 to 9.
CN201911010957.3A 2019-10-23 2019-10-23 Air conditioner refrigeration method and system for data center and data center Pending CN110595013A (en)

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