CN211345649U - Photovoltaic direct-drive dew point indirect evaporative cooling air conditioning system for data center - Google Patents

Photovoltaic direct-drive dew point indirect evaporative cooling air conditioning system for data center Download PDF

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Publication number
CN211345649U
CN211345649U CN201921787712.7U CN201921787712U CN211345649U CN 211345649 U CN211345649 U CN 211345649U CN 201921787712 U CN201921787712 U CN 201921787712U CN 211345649 U CN211345649 U CN 211345649U
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air
evaporative cooling
dew point
air conditioning
indirect evaporative
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CN201921787712.7U
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Chinese (zh)
Inventor
黄翔
屈悦滢
刘振宇
李朝阳
傅耀玮
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Xian Polytechnic University
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Xian Polytechnic University
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Abstract

The utility model discloses an air conditioning system for a photovoltaic direct-drive dew point indirect evaporative cooling data center, which comprises a dew point indirect evaporative cooling air conditioning unit, a data machine room and a photovoltaic power generation direct drive system, wherein the dew point indirect evaporative cooling air conditioning unit is communicated with the data machine room through a return air pipe and an air supply pipe and forms a closed loop; the photovoltaic power generation direct driving system is arranged at the top of the dew point indirect evaporative cooling air conditioning unit, and the dew point indirect evaporative cooling air conditioning unit is connected with the photovoltaic power generation direct driving system. The utility model discloses an air conditioning system has solved that traditional mechanical refrigeration air conditioning system energy consumption is too high, PUE is high and adopt the cold passageway to seal the problem that forms local focus easily in the opportunity cabinet.

Description

Photovoltaic direct-drive dew point indirect evaporative cooling air conditioning system for data center
Technical Field
The utility model belongs to the technical field of air conditioning equipment, concretely relates to photovoltaic directly drives indirect evaporative cooling's of dew point air conditioning system for data center.
Background
At present, the data center keeps a rapid development situation in the aspect of increasing the area of a data center machine room. However, there still exist some problems in terms of energy consumption and PUE, such as too high energy consumption and high PUE, which will hinder the sustainable development of the data center construction industry. Under the guidance and support of a series of relevant policies, the natural cold source adopted for cooling the machine room becomes a future development trend.
The indirect evaporative cooling technology is widely applied to data centers at present, meets the cooling demand of the data centers by indirectly cooling return air of a machine room, but is limited by outdoor meteorological conditions, and the cooling amplitude of the indirect evaporative cooling technology is limited. The dew point indirect evaporative cooling technology enables the temperature of the processed air to break through below the wet bulb temperature and even approach the dew point temperature by improving the refrigeration driving potential, and the technology is applied to a data center, so that the heat exchange efficiency of a cooler can be effectively improved, and the PUE of the data center is reduced.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a photovoltaic directly drives indirect evaporative cooling's of dew point air conditioning system for data center has solved traditional mechanical refrigeration air conditioning system energy consumption too high, PUE is high and adopt the problem that forms local focus easily in the time cabinet when cold aisle seals.
The utility model adopts the technical scheme that the air conditioning system for the data center of the photovoltaic direct-drive dew point indirect evaporative cooling comprises a dew point indirect evaporative cooling air conditioning unit, a data machine room and a photovoltaic power generation direct drive system, wherein the dew point indirect evaporative cooling air conditioning unit is communicated with the data machine room through a return air pipe and an air supply pipe and forms a closed loop;
the photovoltaic power generation direct driving system is arranged at the top of the dew point indirect evaporative cooling air conditioning unit, and the dew point indirect evaporative cooling air conditioning unit is connected with the photovoltaic power generation direct driving system.
Be equipped with many groups of rack group in the data computer lab, every group rack group comprises two racks, and the air-out side of two racks sets up relatively, forms closed hot passageway between the air-out side of two racks, and all closed hot passageways all are connected with the return air passageway that the data computer lab top set up in the data computer lab, and other spaces in the data computer lab are as cold passageway, and cold passageway is connected with the blast pipe.
The photovoltaic power generation direct driving system comprises a solar battery pack, a charge-discharge controller, a storage battery pack, a direct current motor and an air conditioning system controller which are sequentially connected, wherein the air conditioning system controller is connected with a dew point indirect evaporative cooling air conditioning unit.
The dew point indirect evaporative cooling air conditioning unit comprises a unit shell, wherein two opposite side walls of the unit shell are respectively provided with an air return inlet and an air supply outlet, the side wall of the unit shell where the air return inlet is located is also provided with a secondary air inlet, and the secondary air inlet is arranged below the air return inlet; the air return inlet is connected with the air return channel through an air return pipe, and the air supply outlet is connected with the cold channel through an air supply pipe;
an air filter, an indirect-direct evaporative cooling unit and a blower arranged on the base are sequentially arranged in the unit shell according to the flowing direction of air after entering;
the air conditioning system controller is connected with the indirect-direct evaporative cooling unit and the blower.
And a water baffle b is also arranged in the unit shell and is positioned between the indirect-direct evaporative cooling unit and the blower.
An air outlet is arranged on the top wall of the unit shell corresponding to the upper part of the indirect-direct evaporative cooling unit.
The utility model is also characterized in that,
the indirect-direct evaporative cooling unit comprises a dew point indirect evaporative cooling section and a direct evaporative cooling section which are arranged in parallel, and water tanks are arranged below the dew point indirect evaporative cooling section and the direct evaporative cooling section; the dew point indirect evaporative cooling section comprises an exhaust fan, a water baffle a, a water distributor a and a dew point indirect evaporative cooler which are sequentially arranged from top to bottom; the direct evaporative cooling section comprises a water distributor b and a filler which are arranged from top to bottom in sequence; the air outlet is positioned on the top wall of the unit shell above the exhaust fan; a partition plate is horizontally arranged between the side wall of the unit shell between the air return opening and the secondary air inlet and the dew point indirect evaporative cooler, and the partition plate is sleeved on the air filter;
the water distributor is characterized by further comprising a water pipe c, one end of the water pipe c is connected with the water tank, the other end of the water pipe c is connected with a water pipe a and a water pipe b, the water pipe a is connected with the water distributor a, and the water pipe b is connected with the water distributor b;
a water pump and an electronic water treatment instrument are arranged on the water pipe c; the air conditioning system controller is connected with the water pump and the exhaust fan.
The water pipe c is also provided with a valve a which is positioned between the water pump and the electronic water treatment instrument; the water pipe a is provided with a valve b, and the water pipe b is provided with a valve c.
The dew point indirect evaporative cooler is a core body comprising a dry channel unit and a secondary air wet channel, the dry channel unit comprises a primary air dry channel and a secondary air dry channel which are distributed from top to bottom, small holes are formed in the secondary air dry channel, and the secondary air dry channel is communicated with the secondary air wet channel through the small holes.
The filler is GLASDek inorganic filler.
The utility model has the advantages that:
(1) the utility model discloses air conditioning system adopts the dew point indirect-direct evaporative cooling to combine together, and computer lab return air entry sets up the medium efficiency filter, can effectively improve computer lab return air's cleanliness factor, and the system adopts the full return air form, avoids causing the destruction to the chip of data center rack.
(2) The utility model discloses air conditioning system adopts solar photovoltaic to directly drive, reduces the energy consumption, energy saving and emission reduction.
(3) The utility model discloses air conditioning system compares in traditional underfloor air supply form, need not built on stilts floor, and construction convenience invests lowerly.
(4) The utility model discloses air conditioning system's air current organization form adopts hot passageway closed form, and all the other spaces of computer lab are cold channel, are showing and have increased cold channel space and air conditioner redundancy, have improved the refrigeration efficiency of unit.
(5) The air conditioning system of the utility model can fully utilize natural cold source in transition season and winter, and realize that different modes are used for supplying cold to the machine room all the year by selectively opening different functional sections in different seasons; when the air conditioner is used in winter, the dew point indirect evaporative cooling section runs under a dry working condition, and the direct evaporative cooling section can be used as a humidifier, so that the problem of cold and heat offset in the traditional mechanical refrigeration is solved, the utilization rate of the air conditioner is improved, and the refrigeration energy consumption of a data center is reduced.
(6) The utility model discloses the indirect evaporative cooling section of dew point among the air conditioning system is through outdoor new trend to the indirect cooling processing of computer lab return air, compares in general indirect evaporative cooling form, and its temperature drop range is big, can guarantee the air quality in the computer lab.
Drawings
Fig. 1 is a schematic structural view of an air conditioning system for a data center for direct-drive photovoltaic dew-point indirect evaporative cooling according to the present invention;
FIG. 2 is a schematic structural diagram of the dew point indirect evaporative cooling air conditioning unit of the air conditioning system of the present invention;
FIG. 3 is a schematic structural view of the dew point indirect evaporative cooler in the air conditioning system of the present invention;
fig. 4 is a schematic circuit connection diagram of the photovoltaic power generation direct driving system in the air conditioning system of the present invention.
In the figure, 1, a dew point indirect evaporative cooling air conditioning unit, 2, a solar battery pack, 3, a data machine room, 4, an air supply pipe, 5, a cabinet, 6, a closed heat channel, 7, a battery pack, 8, a direct current motor, 9, an air conditioning system controller, 10, a machine room return air channel, 11, an air return pipe, 12, a partition plate, 13, an air return opening, 14, a water distributor a, 15, an air outlet, 16, an exhaust fan, 17, a water baffle a, 18, a water pipe a, 19, a water pipe b, 20, a water distributor b, 21, a water baffle b, 22, an air supply opening, 23, an air blower, 24, a base, 25, a filler, 26, an electronic water processor, 27, a valve a, 28, a water pump, 29, a water pipe c, 30, a secondary air inlet, 31, a water tank, 32, a dew point indirect evaporative cooler, 33, an air filter, 34, a primary air dry channel, 35, a secondary air wet channel, 36. secondary air dry channel, 37 small hole, 38 charge and discharge controller, 39 valve b, 40 valve c.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings and specific embodiments.
The utility model relates to an air conditioning system for data center of indirect evaporative cooling of photovoltaic direct-drive dew point, as shown in fig. 1-4, including dew point indirect evaporative cooling air conditioning unit 1, data computer lab 3 and photovoltaic power generation direct drive system, dew point indirect evaporative cooling air conditioning unit 1 and data computer lab 3 are through return air pipe 11 and blast pipe 4 intercommunication and form closed loop;
the photovoltaic power generation direct driving system is arranged at the top of the dew point indirect evaporative cooling air conditioning unit 1, and the dew point indirect evaporative cooling air conditioning unit 1 is connected with the photovoltaic power generation direct driving system.
A plurality of groups of cabinet groups are arranged in the data machine room 3, each group of cabinet groups consists of two cabinets 5, the air outlet sides of the two cabinets 5 are arranged oppositely, a closed hot channel 6 is formed between the air outlet sides of the two cabinets 5, all the closed hot channels 6 in the data machine room 3 are connected with an air return channel 10 arranged at the top of the data machine room 3, the air of all the closed hot channels in the data machine room 3 is upwards converged to the machine room air return channel 10, and enters the dew point indirect evaporative cooling air conditioning unit 1 through an air return pipe 11 to realize the cooling treatment of the return air of the data machine room 3; and other spaces in the data machine room 3 are used as cold channels, and the cold channels are connected with the air supply pipes 4.
The photovoltaic power generation direct driving system comprises a solar battery pack 2, a charge-discharge controller 38, a storage battery pack 7, a direct current motor 8 and an air conditioning system controller 9 which are sequentially connected, wherein the air conditioning system controller 9 is connected with the dew point indirect evaporative cooling air conditioning unit 1.
The dew point indirect evaporative cooling air conditioning unit 1 comprises a unit shell, wherein two opposite side walls of the unit shell are respectively provided with an air return opening 13 and an air supply opening 22, the side wall of the unit shell where the air return opening 13 is located is also provided with a secondary air inlet opening 30, and the secondary air inlet opening 30 is arranged below the air return opening 13; the return air inlet 13 is connected with the return air channel 10 through a return air pipe 11, and the air supply outlet 22 is connected with the cold channel through an air supply pipe 4;
an air filter 33, an indirect-direct evaporative cooling unit and a blower 23 arranged on the base 24 are sequentially arranged in the unit shell according to the flowing direction of the air after entering; the blower 23 is a centrifugal blower, and the base 24 provides support for the blower 23.
The air conditioning system controller 9 is connected to the indirect-direct evaporative cooling unit and the blower 23.
A water baffle b21 is also provided in the unit housing, and a water baffle b21 is located between the indirect-direct evaporative cooling unit and the blower 23.
An air outlet 15 is arranged on the top wall of the unit shell corresponding to the upper part of the indirect-direct evaporative cooling unit.
The indirect-direct evaporative cooling unit comprises a dew point indirect evaporative cooling section and a direct evaporative cooling section which are arranged in parallel, and a water tank 31 is arranged below the dew point indirect evaporative cooling section and the direct evaporative cooling section; the dew point indirect evaporative cooling section comprises an exhaust fan 16, a water baffle a17, a water distributor a14 and a dew point indirect evaporative cooler 32 which are arranged from top to bottom in sequence; the direct evaporative cooling section comprises a water distributor b20 and a filler 25 which are arranged from top to bottom in sequence; the air outlet 15 is positioned on the top wall of the unit shell above the air exhaust fan 16; a partition plate 12 is horizontally arranged between the side wall of the unit shell between the air return opening 13 and the secondary air inlet opening 30 and the dew point indirect evaporative cooler 32, the partition plate 12 is sleeved on an air filter 33, and the partition plate 12 can prevent two air streams entering from the air return opening 13 and the secondary air inlet opening 30 from being mixed;
the water distributor also comprises a water pipe c29, one end of a water pipe c29 is connected with the water tank 31, the other end of a water pipe c29 is connected with a water pipe a18 and a water pipe b19, the water pipe a18 is connected with a water distributor a14, and the water pipe b19 is connected with a water distributor b 20;
the water pipe c29 is provided with a water pump 28 and an electronic water treatment instrument 26; the air conditioning system controller 9 is connected to the water pump 28 and the exhaust fan 16.
The water pipe c29 is also provided with a valve a27, and the valve a27 is positioned between the water pump 28 and the electronic water treatment instrument 26; a valve b39 is arranged on the water pipe a18, and a valve c40 is arranged on the water pipe b 19; the different functional segments are selectively opened by controlling the valve a27, the valve b39 and the valve c 40.
The dew point indirect evaporative cooler 32 is a core body comprising a dry channel unit and a secondary air wet channel 35, the dry channel unit comprises a primary air dry channel 34 and a secondary air dry channel 36 which are distributed up and down, small holes 37 are formed in the secondary air dry channel 36, and the secondary air dry channel 36 is communicated with the secondary air wet channel 35 through the small holes 37; the primary air dry channel 34 is of a Z-shaped structure, so that the processing time of return air of a machine room can be effectively prolonged.
The filler 25 is a GLASdek inorganic filler.
The air filter 33 is a medium efficiency filter; the exhaust fan 16 is an axial flow fan, the water distributor a14 and the water distributor b20 are in a spraying type, and the secondary air inlet 30 is a grid air inlet; the breakwaters 17a, 21 breakwaters b absorb water droplets entrained in the air.
The utility model discloses air conditioning system's application method and function description are as follows:
(1) wet mode of operation
This mode is summer and transition season mode of operation, outdoor new trend (secondary air) loops through aperture 37 after the secondary air inlet 30 gets into the wet passageway 35 of secondary air that secondary air is done passageway 36 of dew point indirect evaporative cooler 32 by the precooling, carry out the sensible heat transfer through the computer lab return air (primary air) with in the primary air dry channel 34, the dry passageway 34 of primary air of computer lab return air (primary air) at dew point indirect evaporative cooler 32 is cooled by outdoor new trend (secondary air) indirectly, send into data computer lab 3 at last and cool down rack 5, specifically do:
machine room return air in the closed hot channel 6 enters the dew point indirect evaporative cooling air conditioning unit 1 through the return air pipe 11, the return air is filtered by the air filter 33, after purification, the return air enters the primary air dry channel 34 of the dew point indirect evaporator cooler 32 and carries out indirect heat exchange with the secondary air wet channel 35, after the cooled machine room return air is subjected to isenthalpic cooling through the direct evaporative cooling section, under the action of the air feeder 23, the return air is sent to the cold channel of the data machine room 3 through the air supply pipe 4, after waste heat of the cabinet 5 is absorbed, the discharged hot return air enters the closed hot channel 6 to the machine room return air channel 10, then enters the dew point indirect evaporative cooling air conditioning unit 1 through the return air pipe 11, and the air circulation is repeated to provide cold quantity for.
Wherein, the working process of the dew point indirect evaporative cooler is as follows: outdoor fresh air enters a secondary air dry channel 36 of a dew point indirect evaporative cooler 32 through a secondary air inlet 30, is precooled and then sequentially enters a secondary air wet channel 35 through a small hole 37, performs sensible heat exchange with machine room return air in a primary air dry channel 34, and is discharged by a secondary air exhaust fan 16 after performing sufficient heat and mass exchange with a water film of the secondary air wet channel 35 and the machine room return air in the primary air dry channel 34; the machine room return air enters a primary air dry channel 34 of the dew point indirect evaporative cooler 32, is subjected to indirect heat exchange with outdoor fresh air through a heat exchange plate, is subjected to constant humidity cooling, is sent into the data machine room 3 through the air supply outlet 22 through the air supply pipe 4 to cool the machine cabinet 5, and is circulated continuously.
In this mode, the spray section of the indirect section or the direct section can be selectively opened according to the change of outdoor climate. Under outdoor extreme working conditions, when the dew point indirect evaporative cooling air conditioning unit 1 cannot meet the refrigeration requirement of the data machine room 3, a precise air conditioner can be additionally arranged to supply more cold energy to a machine room cold channel for cooling so as to meet the environmental requirement of the data machine room 3.
(2) Dry mode operation mode
This mode is winter operation mode, and dew point indirect evaporative cooling section moves under the dry condition, does not spray the circulating water this moment, and the indirect heat transfer is carried out through dew point indirect evaporative cooler 32 to computer lab return air and outdoor new trend and provides cold volume for data computer lab 3, specifically does:
machine room return air in the closed hot channel 6 enters the dew point indirect evaporative cooling air conditioning unit 1 through the return air pipe 11, the return air is filtered and purified through the air filter 33 and then enters the primary air dry channel 34 of the dew point indirect evaporator cooler 32, outdoor fresh air enters the secondary air dry channel 36 of the dew point indirect evaporative cooler 32 through the secondary air inlet 30, after being precooled, the outdoor fresh air enters the secondary air wet channel 35 through the small hole 37 to carry out indirect heat exchange, the cooled machine room return air is sent to the cold channel of the data machine room 3 through the air supply pipe 4 under the action of the air supply device 23, after waste heat of the cabinet 5 is absorbed, the discharged hot return air enters the closed hot channel 6 to the machine room return air channel 10 and then enters the dew point indirect evaporative cooling air conditioning unit 1 through the return air pipe 11 to be repeatedly circulated, and cold energy is provided.

Claims (5)

1. The air conditioning system for the data center is characterized by comprising a dew point indirect evaporative cooling air conditioning unit (1), a data machine room (3) and a photovoltaic power generation direct driving system, wherein the dew point indirect evaporative cooling air conditioning unit (1) is communicated with the data machine room (3) through a return air pipe (11) and an air supply pipe (4) to form a closed loop; the photovoltaic power generation direct driving system is arranged at the top of the dew point indirect evaporative cooling air conditioning unit (1), and the dew point indirect evaporative cooling air conditioning unit (1) is connected with the photovoltaic power generation direct driving system;
a plurality of groups of cabinet groups are arranged in the data machine room (3), each group of cabinet group consists of two cabinets (5), the air outlet sides of the two cabinets (5) are arranged oppositely, a closed hot channel (6) is formed between the air outlet sides of the two cabinets (5), all the closed hot channels (6) in the data machine room (3) are connected with an air return channel (10) arranged at the top of the data machine room (3), other spaces in the data machine room (3) are used as cold channels, and the cold channels are connected with an air supply pipe (4);
the photovoltaic power generation direct driving system comprises a solar battery pack (2), a charge-discharge controller (38), a storage battery pack (7), a direct current motor (8) and an air conditioning system controller (9) which are sequentially connected, wherein the air conditioning system controller (9) is connected with a dew point indirect evaporative cooling air conditioning unit (1);
the dew point indirect evaporative cooling air conditioning unit (1) comprises a unit shell, wherein two opposite side walls of the unit shell are respectively provided with an air return opening (13) and an air supply opening (22), the side wall of the unit shell where the air return opening (13) is located is also provided with a secondary air inlet (30), and the secondary air inlet (30) is arranged below the air return opening (13); the return air inlet (13) is connected with the return air channel (10) through a return air pipe (11), and the air supply outlet (22) is connected with the cold channel through an air supply pipe (4); an air filter (33), an indirect-direct evaporative cooling unit and a blower (23) arranged on a base (24) are sequentially arranged in the unit shell according to the flowing direction of the air after entering; the air conditioning system controller (9) is connected with the indirect-direct evaporative cooling unit and the blower (23);
a water baffle b (21) is also arranged in the unit shell, and the water baffle b (21) is positioned between the indirect-direct evaporative cooling unit and the blower (23); and an air outlet (15) is arranged on the top wall of the unit shell corresponding to the upper part of the indirect-direct evaporative cooling unit.
2. The air conditioning system for the data center of the photovoltaic direct-drive dew point indirect evaporative cooling as claimed in claim 1, wherein the indirect-direct evaporative cooling unit comprises a dew point indirect evaporative cooling section and a direct evaporative cooling section which are arranged in parallel, and a water tank (31) is arranged below the dew point indirect evaporative cooling section and the direct evaporative cooling section; the dew point indirect evaporative cooling section comprises an exhaust fan (16), a water baffle a (17), a water distributor a (14) and a dew point indirect evaporative cooler (32) which are sequentially arranged from top to bottom; the direct evaporative cooling section comprises a water distributor b (20) and a filler (25) which are arranged from top to bottom in sequence; the air outlet (15) is positioned on the top wall of the unit shell above the exhaust fan (16);
a partition plate (12) is horizontally arranged between the side wall of the unit shell between the air return opening (13) and the secondary air inlet (30) and the dew point indirect evaporative cooler (32), and the partition plate (12) is sleeved on an air filter (33);
the water distributor also comprises a water pipe c (29), one end of the water pipe c (29) is connected with the water tank (31), the other end of the water pipe c (29) is connected with a water pipe a (18) and a water pipe b (19), the water pipe a (18) is connected with the water distributor a (14), and the water pipe b (19) is connected with the water distributor b (20);
a water pump (28) and an electronic water treatment instrument (26) are arranged on the water pipe c (29); the air conditioning system controller (9) is connected with the water pump (28) and the exhaust fan (16).
3. The air conditioning system for the data center of photovoltaic direct-drive dew point indirect evaporative cooling as claimed in claim 2, wherein a valve a (27) is further arranged on the water pipe c (29), and the valve a (27) is located between the water pump (28) and the electronic water treatment instrument (26); a valve b (39) is arranged on the water pipe a (18), and a valve c (40) is arranged on the water pipe b (19).
4. The air conditioning system for the data center of the photovoltaic direct-drive dew point indirect evaporative cooling as claimed in claim 2, wherein the dew point indirect evaporative cooler (32) is a core body comprising a dry channel unit and a secondary air wet channel (35), the dry channel unit comprises a primary air dry channel (34) and a secondary air dry channel (36) which are distributed up and down, small holes (37) are formed in the secondary air dry channel (36), and the secondary air dry channel (36) is communicated with the secondary air wet channel (35) through the small holes (37).
5. The air conditioning system for a photovoltaic direct-drive dew point indirect evaporative cooling data center as claimed in claim 2, wherein the filler (25) is GLASDek inorganic filler.
CN201921787712.7U 2019-10-23 2019-10-23 Photovoltaic direct-drive dew point indirect evaporative cooling air conditioning system for data center Active CN211345649U (en)

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Application Number Priority Date Filing Date Title
CN201921787712.7U CN211345649U (en) 2019-10-23 2019-10-23 Photovoltaic direct-drive dew point indirect evaporative cooling air conditioning system for data center

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110753479A (en) * 2019-10-23 2020-02-04 西安工程大学 Photovoltaic direct-drive dew point indirect evaporative cooling air conditioning system for data center

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110753479A (en) * 2019-10-23 2020-02-04 西安工程大学 Photovoltaic direct-drive dew point indirect evaporative cooling air conditioning system for data center
CN110753479B (en) * 2019-10-23 2020-12-08 西安工程大学 Photovoltaic direct-drive dew point indirect evaporative cooling air conditioning system for data center

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