CN114158233B - Indirect evaporative cooling air conditioning unit, and operation control method and device thereof - Google Patents

Indirect evaporative cooling air conditioning unit, and operation control method and device thereof Download PDF

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Publication number
CN114158233B
CN114158233B CN202010936311.4A CN202010936311A CN114158233B CN 114158233 B CN114158233 B CN 114158233B CN 202010936311 A CN202010936311 A CN 202010936311A CN 114158233 B CN114158233 B CN 114158233B
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Prior art keywords
fan
air
fans
current
rotating speed
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CN114158233A (en
Inventor
李大红
林华和
蔡雁
刘科伟
王南南
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Vertiv Tech Co Ltd
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Vertiv Tech Co Ltd
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    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K7/00—Constructional details common to different types of electric apparatus
    • H05K7/20—Modifications to facilitate cooling, ventilating, or heating
    • H05K7/20709—Modifications to facilitate cooling, ventilating, or heating for server racks or cabinets; for data centers, e.g. 19-inch computer racks
    • H05K7/20836—Thermal management, e.g. server temperature control
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
    • F24F1/0007—Indoor units, e.g. fan coil units
    • F24F1/0011—Indoor units, e.g. fan coil units characterised by air outlets
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/50—Control or safety arrangements characterised by user interfaces or communication
    • F24F11/61—Control or safety arrangements characterised by user interfaces or communication using timers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
    • F24F11/63—Electronic processing
    • F24F11/64—Electronic processing using pre-stored data
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/70—Control systems characterised by their outputs; Constructional details thereof
    • F24F11/72—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure
    • F24F11/74—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure for controlling air flow rate or air velocity
    • F24F11/77—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure for controlling air flow rate or air velocity by controlling the speed of ventilators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/70—Control systems characterised by their outputs; Constructional details thereof
    • F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
    • F24F11/83—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers
    • F24F11/84—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers using valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
    • F24F13/28—Arrangement or mounting of filters
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
    • F24F13/30—Arrangement or mounting of heat-exchangers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2110/00—Control inputs relating to air properties
    • F24F2110/30—Velocity
    • Y—GENERAL 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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
    • Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Combustion & Propulsion (AREA)
  • Physics & Mathematics (AREA)
  • Signal Processing (AREA)
  • Fluid Mechanics (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Thermal Sciences (AREA)
  • Computer Hardware Design (AREA)
  • Fuzzy Systems (AREA)
  • Mathematical Physics (AREA)
  • Human Computer Interaction (AREA)
  • Air Conditioning Control Device (AREA)

Abstract

The invention discloses an indirect evaporative cooling air conditioning unit, and an operation control method and device thereof, wherein the unit comprises: the case comprises a first air channel and a second air channel, wherein the first air channel is provided with a first air inlet and a first air outlet, and the second air channel is provided with a second air inlet and a second air outlet; the first fan assembly is arranged adjacent to the first air inlet and comprises at least two first fans and first air valves which are arranged opposite to the first fans one by one; the second fan assembly is arranged close to the second air outlet and comprises at least two second fans and second air valves which are arranged opposite to the second fans one by one; the controller is used for obtaining the current rotation speeds of the first fans and the second fans, when the current rotation speed of any one first fan is zero, the corresponding first air valve is controlled to be closed, and when the current rotation speed of any one second fan is zero, the corresponding second air valve is controlled to be closed. The air conditioning unit can avoid airflow organization passing through the fan which stops running, and ensures the cold energy supply of the unit.

Description

Indirect evaporative cooling air conditioning unit, and operation control method and device thereof
Technical Field
The invention relates to the technical field of air conditioning equipment, in particular to an indirect evaporative cooling air conditioning unit, and an operation control method and device thereof.
Background
With the continuous development of the IT industry, rack servers with high heat density of a data center are used in a large quantity, and basically run for 8760 hours all the year round, so that the attention and acceptance of users to energy-efficient products are very high. The energy efficiency of the air conditioner is improved, and the running cost of a machine room can be reduced. In the area with dry climate and low temperature, the indirect evaporative cooling air conditioner can fully utilize natural cold source, has high energy efficiency of the whole machine and has the advantage of excellent energy conservation.
Once the air conditioner of the machine room is down, local hot spots are generated in the machine room, and the cabinet server has operation faults due to high temperature, so that irreversible loss is caused to the whole network system. The indoor fan and the outdoor fan are one of key devices of the indirect evaporative cooling air conditioning unit, if the fan on the indoor side or the fan on the outdoor side of the unit fails, the fan can cause air quantity wind and even short circuit, the cooling capacity of the whole machine is attenuated or lost, the whole machine is required to be maintained after shutdown, if shutdown maintenance is carried out, a server is easy to produce downtime, and if the whole machine is backed up, the initial investment of a machine room is large.
For example, as shown in fig. 1, in a conventional indirect evaporative cooling system, when one or more fans of the first fan group 01 on the indoor side or the second fan group 02 on the outdoor side fail, it is conventional to shut down all fans for maintenance. Assuming that the second fan 021 in the second fan set fails to stop rotating, the air outlet of the second fan 022 in the second fan set is partially or completely sucked by the second fan 022 again through the second fan 021 (the air flow direction of the second fan set outside the room is shown as the black arrow direction in fig. 1), which may cause short circuit of air flow organization, attenuation or loss of unit cooling capacity, and no effective cooling of the server. If the first fan on the indoor side or the second fan on the outdoor side alarms, the whole machine is stopped, and the cold quantity is lost, so that local hot spots of a machine room can be caused.
Disclosure of Invention
The invention provides an indirect evaporative cooling air conditioning unit, and an operation control method and device thereof, wherein the indirect evaporative cooling air conditioning unit can avoid air flow organization from being in cross wind or short circuit caused by a fan which stops running, ensure the cold energy supply of the unit and improve the reliability of the unit.
In order to achieve the above purpose, the present invention provides the following technical solutions:
an indirect evaporative cooling air conditioning unit comprising:
the machine box comprises a first air channel and a second air channel for performing heat exchange with the first air channel, wherein two ends of the first air channel are respectively provided with a first air inlet for communicating with a machine room return air inlet and a first air outlet for communicating with a machine room air supply outlet, and two ends of the second air channel are respectively provided with a second air inlet and a second air outlet for communicating with outside air;
The first fan assembly comprises at least two first fans and first air valves which are arranged opposite to the first fans one by one, and the first fan assembly is arranged on the first air duct and adjacent to the first air inlet;
the second fan assembly comprises at least two second fans and second air valves which are arranged opposite to the second fans one by one, and the second fan assembly is arranged on the second air duct and is close to the second air outlet;
The rotating speed detection module is used for detecting the rotating speeds of the first fans and the second fans;
The controller is in signal connection with each first fan, each second fan, each first air valve, each second air valve and the rotating speed detection module, and is used for:
acquiring the current rotating speeds of the first fans and the second fans;
And when the current rotating speed of any one of the first fans is zero, controlling the corresponding first air valve to be closed, and when the current rotating speed of any one of the second fans is zero, controlling the corresponding second air valve to be closed.
The indirect evaporative cooling air conditioning unit comprises a case, a first fan assembly, a second fan assembly, a rotating speed detection module and a controller, wherein the first fan assembly and the second fan assembly are arranged in the case, the rotating speed detection module and the controller are arranged in the case, the case comprises a first air channel and a second air channel which is used for carrying out heat exchange with the first air channel, two ends of the first air channel are respectively provided with a first air inlet which is used for being communicated with an air return port of a machine room and a first air outlet which is used for being communicated with an air supply port of the machine room, two ends of the second air channel are respectively provided with a second air inlet which is communicated with outside air and a second air outlet which is used for being communicated with the first air inlet, the first fan assembly is arranged on the first air channel adjacent to the first air inlet, the second fan assembly is arranged on the second air channel adjacent to the second air outlet, the second fan assembly is arranged on the second air channel and is provided with at least two second fans and a second air valve which is arranged opposite to the second fan one to the first fan, the rotating speed detection module is used for detecting the rotating speeds of each first fan and each second fan, and the controller is used for obtaining the current rotating speeds of each first fan and each second fan, and controlling the corresponding first fan to be closed when the current rotating speeds of any first fan are zero, and the corresponding first fan is closed when the current rotating speeds of any first fan are zero. According to the indirect evaporative cooling air conditioning unit, as the first air valves are independently arranged on each first fan, the second air valves are independently arranged on each second fan, when the rotating speed of the first fan or the second fan is zero, namely when the first fan or the second fan stops running, the air valves corresponding to the fans with the rotating speed being controlled to be zero are closed, so that the air flow blown out by the running fans is blocked by the closed air valves, the air flow organization is prevented from being in air flowing or short-circuited caused by the fans which stop running, the cold energy supply of the unit is ensured, and the reliability of the unit is improved.
In one possible embodiment, the air-air heat exchanger is further comprised, and the air-air heat exchanger is communicated with the first air duct and the second air duct so as to enable the first air duct to exchange heat with the second air duct.
In one possible embodiment, the system further comprises a spray device comprising a nozzle located between the second fan assembly and the air-to-air heat exchanger.
In one possible embodiment, a water mist separator is provided between the nozzle and the second fan assembly.
In one possible implementation manner, a first filter screen is arranged between the first fan assembly and the air-air heat exchanger, and a second filter screen is arranged between the second air inlet and the air-air heat exchanger.
In a possible implementation manner, the system further comprises an alarm device, the alarm device is used for detecting the body states of each first fan and each second fan in operation, the controller is connected with the alarm device in a signal manner, and before the current rotating speeds of each first fan and each second fan are obtained, the controller is used for:
acquiring the body state information of each first fan and each second fan;
judging whether each first fan and each second fan have faults according to the body state information of each first fan and each second fan, and if so, determining the fault grade of the first fan or the second fan according to preset judging conditions;
and controlling whether the first fan or the second fan is stopped according to the failure level of the first fan or the second fan.
In a possible implementation manner, the fan further comprises a temperature detection device, the temperature detection device is used for detecting the current air supply temperature at the first air outlet, the controller is in signal connection with the temperature detection device, and before the current rotation speeds of the first fans and the second fans are obtained, the controller is used for:
acquiring the current rotating speed of the second fan;
If the current rotating speed of each second fan in operation is smaller than or equal to the preset minimum rotating speed, acquiring the current air supply temperature at the first air outlet;
and if the current air supply temperature is smaller than the preset temperature and the preset time is maintained, controlling the second fans to be stopped in sequence according to the preset stopping sequence.
In one possible embodiment, the controller is further configured to:
Continuously acquiring the current air supply temperature at the first air outlet in the process of sequentially closing the second fans;
And if the current air supply temperature is not less than the preset temperature, controlling the second fan which is not stopped to keep running, and controlling the rotating speed of the second fan which is not stopped to gradually increase.
In one possible embodiment, the controller is further configured to:
after the rotating speed of the second fan which is not stopped is controlled to be gradually increased, continuously acquiring the current air supply temperature at the first air outlet and acquiring the current rotating speed of the second fan which is not stopped;
And if the current air supply temperature is not less than the preset temperature and the current rotating speed of the second fan which is not stopped is greater than or equal to the preset fan starting rotating speed, controlling the stopped second fan to start to operate according to the preset starting sequence.
Based on the same inventive concept, the embodiment of the invention provides an operation control method of an indirect evaporative cooling air conditioning unit, which comprises the following steps:
acquiring the current rotating speeds of the first fans and the second fans;
And when the current rotating speed of any one of the first fans is zero, controlling the corresponding first air valve to be closed, and when the current rotating speed of any one of the second fans is zero, controlling the corresponding second air valve to be closed.
In the embodiment of the invention, when the rotating speed of the first fan or the second fan is zero, namely when the first fan or the second fan stops running, the air valve corresponding to the fan with the rotating speed of zero is controlled to be closed, so that the air flow blown out by the running fan is blocked by the closed air valve, the cross wind or short circuit caused by the air flow organization passing through the fan with the stopped running is avoided, the cold energy supply of the unit can be ensured, and the reliability of the unit is improved.
Based on the same inventive concept, an embodiment of the present invention provides an operation control device of an indirect evaporative cooling air conditioning unit, including:
The acquisition unit is used for acquiring the current rotation speeds of the first fans and the second fans;
A control unit for:
And when the current rotating speed of any one of the first fans is zero, controlling the corresponding first air valve to be closed, and when the current rotating speed of any one of the second fans is zero, controlling the corresponding second air valve to be closed.
In the embodiment of the invention, when the rotating speed of the first fan or the second fan is zero, namely when the first fan or the second fan stops running, the air valve corresponding to the fan with the rotating speed of zero is controlled to be closed, so that the air flow blown out by the running fan is blocked by the closed air valve, the cross wind or short circuit caused by the air flow organization passing through the fan with the stopped running is avoided, the cold energy supply of the unit can be ensured, and the reliability of the unit is improved.
Drawings
FIG. 1 is a schematic diagram of an indirect evaporative cooling air conditioning unit in the prior art;
Fig. 2 is a schematic structural diagram of an indirect evaporative cooling air conditioning unit according to an embodiment of the present invention;
FIG. 3a is a schematic diagram illustrating a preset shutdown sequence of a second fan according to an embodiment of the present invention;
FIG. 3b is a schematic diagram illustrating a preset shutdown sequence of the second fan according to an embodiment of the present invention;
FIG. 3c is a schematic diagram illustrating a preset shutdown sequence of the second fan according to an embodiment of the present invention;
FIG. 4 is a flow chart of a method for controlling operation of an indirect evaporative cooling air conditioning unit according to an embodiment of the present invention;
FIG. 5 is a flow chart illustrating the operation control of an indirect evaporative cooling air conditioning unit under low load conditions according to an embodiment of the present invention;
Fig. 6 is a schematic structural diagram of an operation control device of an indirect evaporative cooling air conditioning unit according to an embodiment of the present invention.
Icon:
01-a first fan set; 02-a second fan set; 021. 022-a second fan.
1-A case; 11-a first air inlet; 12-a first air outlet; 13-a second air inlet; 14-a second air outlet; 2-a first fan assembly; 21-a first fan; 22-a first damper; 3-a second fan assembly; 31-a second fan; 32-a second damper; 4-an air-air heat exchanger; 5-nozzle; 6-a water mist separator; 7-a first filter screen; 8-a second filter screen;
100-an acquisition unit; 200-control unit.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 2, an embodiment of the present invention provides an indirect evaporative cooling air conditioning unit, including:
The machine case 1 comprises a first air channel and a second air channel for heat exchange with the first air channel, wherein the two ends of the first air channel are respectively provided with a first air inlet 11 for communicating with a machine room air return inlet and a first air outlet 12 for communicating with a machine room air supply outlet, and the two ends of the second air channel are respectively provided with a second air inlet 13 and a second air outlet 14 for communicating with outside air;
the first fan assembly 2, the first fan assembly 2 comprises at least two first fans 21 and first air valves 22 which are arranged opposite to the first fans 21 one by one, and the first fan assembly 2 is arranged on the first air duct and adjacent to the first air inlet 11;
The second fan assembly 3, the second fan assembly 3 comprises at least two second fans 31 and second air valves 32 which are arranged opposite to the second fans 31 one by one, and the second fan assembly 3 is arranged on the second air duct and close to the second air outlet 14;
The rotation speed detection module is used for detecting the rotation speeds of the first fans 21 and the second fans 31;
The controller, controller and each first fan 21, each second fan 31, each first blast gate 22, each second blast gate 32 and rotational speed detection module signal connection, the controller is used for:
Acquiring the current rotation speeds of the first fans 21 and the second fans 31;
When the current rotation speed of any one of the first fans 21 is zero, the corresponding first air valve 22 is controlled to be closed, and when the current rotation speed of any one of the second fans 31 is zero, the corresponding second air valve 32 is controlled to be closed.
The embodiment of the invention provides an indirect evaporative cooling air conditioning unit, which comprises a case 1, a first fan assembly 2 and a second fan assembly 3 which are positioned in the case 1, a rotating speed detection module and a controller, wherein the case 1 comprises a first air channel and a second air channel which is used for carrying out heat exchange with the first air channel, two ends of the first air channel are respectively provided with a first air inlet 11 which is used for being communicated with a machine room return air inlet and a first air outlet 12 which is used for being communicated with a machine room air supply outlet, two ends of the second air channel are respectively provided with a second air inlet 13 which is communicated with outside air and a second air outlet 14, the first fan assembly 2 is arranged close to the first air inlet 11 on the first air channel, at least two first fans 21 and first air valves 22 which are arranged close to the first fans 21 one by one, the second fan assembly 3 is arranged close to the second air outlet 14 on the second air channel, at least two second fans 31 and second air valves 32 which are arranged one by one opposite to the second fans 31, the rotating speed detection module is used for detecting the rotating speeds of each first fan 21 and each second fan 31, and the controller is used for obtaining the rotating speeds of each first fan 21 and each second fan 31, and controlling the current rotating speeds of the first fan 21 and the second fan valves to be closed when the current rotating speeds of the first fan 21 and the first fan valves are corresponding to the first fan valves and the second fan valves are closed. In the indirect evaporative cooling air conditioning unit, since each first fan 21 is independently provided with one first air valve 22, each second fan 31 is independently provided with one second air valve 32, when the rotation speed of the first fan 21 or the second fan 31 is zero, that is, when the first fan 21 or the second fan 31 stops running, the air valve corresponding to the fan with the rotation speed being controlled to be closed, the air flow blown by the running fan is blocked by the closed air valve, the air flow organization is prevented from being in a series of air or short circuit caused by the fan with the stop running, the cold energy supply of the unit can be ensured, and the reliability of the unit is improved.
Specifically, in all the first fans 21 and the second fans 31, when the fans are operating normally, the rotation speed of the fans is greater than zero, and the corresponding air valves are in an open state; when the fan stops running, the rotating speed of the fan is equal to zero, the corresponding air valve is in a closed state, other fans can normally run, the phenomenon that air current is strung through the fan which stops running or short circuit is avoided, and the backup function of the fan can be realized structurally.
In the first fan assembly 2, the first air valve 22 may be located on a side of the first fan 21 away from the first air inlet 11, or the first air valve 22 may be located on a side of the first fan 21 adjacent to the first air inlet 11, which is not limited herein according to practical situations. In the second fan assembly 3, the second air valve 32 may be located on a side of the first fan 21 away from the second air outlet 14, or may be located on a side of the second fan 31 adjacent to the first air inlet 11, which is not limited herein according to the practical situation.
Specifically, the indirect evaporative cooling air conditioning unit further comprises an air-air heat exchanger 4, and the air-air heat exchanger 4 is communicated with the first air duct and the second air duct so that the first air duct and the second air duct exchange heat.
Specifically, the indirect evaporative cooling air conditioning unit further comprises a spraying device, and the spraying device comprises a nozzle 5 positioned between the second fan assembly 3 and the air-to-air heat exchanger 4. The water sprayed out of the nozzle 5 can reduce the temperature of the air in the second air duct, so that the refrigerating effect is better when the heat exchange is carried out between the first air duct and the second air duct.
Specifically, in order to avoid that the water sprayed from the nozzle 5 affects the operation of the second fan 31, a water mist separator 6 is provided between the nozzle 5 and the second fan assembly 3.
Specifically, be provided with first filter screen 7 between first fan subassembly 2 and the empty air heat exchanger 4, be provided with second filter screen 8 between second air intake 13 and the empty air heat exchanger 4, avoid getting into the impurity too much in the air of empty air heat exchanger 4, influence the operation of empty air heat exchanger 4.
The indirect evaporative cooling air conditioning unit is also provided with an auxiliary cooling system, and when the effect of indirect evaporative cooling refrigeration of the air-to-air heat exchanger 4 can not meet the refrigeration requirement, the auxiliary cooling system can be started to perform refrigeration. The auxiliary cooling system can be an air-cooled compressor refrigeration system and/or a chilled water refrigeration system.
In one possible implementation manner, the indirect evaporative cooling air conditioning unit further includes an alarm device, the alarm device is used for detecting the body states of each first fan 21 and each second fan 31 in operation, and the controller is connected with the alarm device in a signal manner, and before the current rotation speeds of each first fan 21 and each second fan 31 are obtained, the controller is used for:
Acquiring body state information of each first fan 21 and each second fan 31;
Judging whether the first fans 21 and the second fans 31 have faults according to the body state information of the first fans 21 and the second fans 31, and if so, determining the fault level of the first fans 21 or the second fans 31 according to preset judging conditions;
Whether the failed first fan 21 or second fan 31 is stopped is controlled according to the failure level of the failed first fan 21 or second fan 31.
In the embodiment of the invention, the alarm device may detect the body states of each first fan 21 and each second fan 31 in operation, and the controller may acquire the body state information of each first fan 21 and each second fan 31, if one or several fans are found to fail, determine the failure level of the failed first fan 21 or second fan 31 according to the preset determination condition, and then, according to the failure level of the failed first fan 21 or second fan 31, control whether the failed first fan 21 or second fan 31 is stopped. Specifically, the preset determination conditions and the classification of the failure level are not limited, and may be set by the user according to the test or experience.
For example, when the failure level of a certain fan is low, the influence on the operation of the fan is not great, the controller can control the fan to operate according to the original rotation speed, maintenance is not needed to be performed without stopping the machine, and when the failure level of the certain fan is high, the influence on the operation of the fan is great, the controller can control the fan to stop operating, at the moment, the rotation speed of the fan is zero, the controller can control the air valve corresponding to the fan to be closed, so that the air flow blown out by the fan in operation is blocked by the closed air valve, and the phenomenon that the air flow organization passes through the air flow of the fan in stop operation to cause cross wind or short circuit is avoided. According to the scheme, each fan can maintain the original rotating speed or stop running according to the judgment of the fault level of the fan, when all fans are in fault alarming, a certain fan or a plurality of fans are still in a running state, when part of fans are in fault alarming, the unit can be guaranteed to be in a refrigerating state to the maximum extent, enough cold is provided for a machine room, the problem of local hot spots of the machine room caused by air conditioner downtime is solved, and the reliability of an indirect evaporative cooling air conditioning system is improved.
In a possible embodiment, the air conditioner further includes a temperature detecting device, the temperature detecting device is used for detecting a current air supply temperature at the first air outlet 12, the controller is in signal connection with the temperature detecting device, and before the current rotation speeds of the first fans 21 and the second fans 31 are obtained, the controller is used for:
Acquiring the current rotation speed of the second fan 31;
if the current rotation speed of each second fan 31 in operation is less than or equal to the preset minimum rotation speed, the current air supply temperature at the first air outlet 12 is obtained;
If the current supply air temperature is less than the preset temperature and is maintained for the preset time, the second fans 31 in operation are controlled to be sequentially stopped according to the preset stopping sequence.
In the embodiment of the invention, when the second fans 31 in the air-conditioning unit are all operating normally, the hot air in the machine room exchanges heat with the low-temperature air outside through the air-to-air heat exchanger 4, the hot air in the machine room is cooled, and when the outdoor environment temperature is very low, even if the second fans 31 maintain the minimum rotation speed, the air-to-air heat exchanger 4 may provide excessive cold energy, so that the air temperature in the machine room is too low. Specifically, the current rotation speed of each second fan 31 in operation is less than or equal to the preset minimum rotation speed, that is, the second fans 31 maintain the minimum rotation speed, if the current air supply temperature is less than the preset temperature, excessive cold energy is provided for the machine room, the air conditioning unit is in low-load operation, so that the air temperature in the machine room is too low, and the second fans 31 in operation are controlled to be sequentially stopped according to the preset stopping sequence, so that the fan power can be reduced in low-load operation, the unit performance is improved, and meanwhile, the temperature in the machine room is accurately controlled.
Specifically, the preset temperature is not limited, and may be set by the user according to a trial test or experience. The preset shutdown sequence can be set according to the air flow organization characteristics of the unit, and the air flow organization of the unit can be ensured to be uniform as much as possible.
For example, when 6 second fans 31 are included in the second fan assembly 3, the preset shutdown sequence of the second fans 31 may be as shown in fig. 3 a; when 4 second fans 31 are included in the second fan assembly 3, the preset closing sequence of the second fans 31 may be as shown in fig. 3 b; when 9 second fans 31 are included in the second fan assembly 3, the preset shutdown sequence of the second fan assembly 3 may be as shown in fig. 3 c. In fig. 3a, 3b and 3c, ON represents a state of being always ON, 1 st、2nd、3rd、4th、5th、6th、7th、8th represents a sequence of turning off the second fan 31, and the number is turned off first before.
The second fans 31 in operation may be sequentially stopped at first preset intervals, for example, the first second fans 31 are stopped at first preset intervals, and then the second fans 31 are stopped. The first preset interval time is not limited herein and may be set by the user according to experimental tests or experience.
In one possible embodiment, the controller is further configured to:
Continuously acquiring the current air supply temperature at the first air outlet 12 in the process of sequentially closing the second fans 31;
if the current air supply temperature is not less than the preset temperature, the second fan 31 which is not stopped is controlled to keep running, and the rotating speed of the second fan 31 which is not stopped is controlled to gradually increase.
In the embodiment of the present invention, if the cooling capacity of the unit is insufficient after the second fans 31 are turned off to a certain amount, the air supply temperature at the first air outlet 12 is not less than the preset temperature, the second fans 31 that are not stopped can be controlled to keep running, and the rotational speed of the second fans 31 that are not stopped can be controlled to gradually increase.
In one possible embodiment, the controller is further configured to:
after the rotating speed of the second fan 31 which is not stopped is controlled to be gradually increased, continuously acquiring the current air supply temperature at the first air outlet 12 and acquiring the current rotating speed of the second fan 31 which is not stopped;
If the current air supply temperature is not less than the preset temperature and the current rotating speed of the second fan 31 which is not stopped is greater than or equal to the preset fan starting rotating speed, the stopped second fan 31 is controlled to start to operate according to the preset starting sequence.
In the embodiment of the present invention, if the second fans 31 are turned off to a certain amount, the cooling capacity of the unit is insufficient, so that the rotation speed of the second fans 31 that are not stopped is increased, that is, when the supply air temperature is not less than the preset temperature and the rotation speed of the second fans 31 that are not stopped is greater than or equal to the preset fan starting rotation speed, the stopped second fans 31 can be controlled to start running according to the preset starting sequence. The preset starting sequence can be the same as the preset stopping sequence, namely, the fan which is closed first is started first, the limitation is not made, and the fan can be set by a user according to test or experience. The preset fan starting rotation speed can be equal to the preset minimum rotation speed plus the preset fan starting rotation speed return difference, the preset fan starting return difference is not limited, and the preset fan starting return difference can be set by a user according to test or experience.
Specifically, when the second fans 31 are controlled to start operating according to the preset starting sequence, the next second fan 31 may be controlled to be started after a second preset interval time is delayed when the rotation speed of the previous second fan 31 reaches the preset target rotation speed. The preset target rotational speed may be a preset minimum rotational speed plus a preset fan start rotational speed return difference.
Based on the same inventive concept, the embodiment of the invention provides an operation control method of an indirect evaporative cooling air conditioning unit, as shown in fig. 4, comprising the following steps:
s401: acquiring the current rotating speeds of the first fans and the second fans;
S402: and when the current rotating speed of any one of the first fans is zero, controlling the corresponding first air valve to be closed, and when the current rotating speed of any one of the second fans is zero, controlling the corresponding second air valve to be closed.
In the operation control method of the indirect evaporative cooling air conditioning unit, when the rotating speed of the first fan or the second fan is zero, namely when the first fan or the second fan stops operating, the air valve corresponding to the fan with the rotating speed being controlled to be zero is closed, so that the air flow blown out by the fan in operation is blocked by the closed air valve, the cross wind or short circuit caused by the air flow organization passing through the fan with the stopped operation is avoided, the cold energy supply of the unit can be ensured, and the reliability of the unit is improved.
In one possible implementation manner, before the obtaining the current rotation speeds of the first fans and the second fans, the method includes:
acquiring the body state information of each first fan and each second fan;
judging whether each first fan and each second fan have faults according to the body state information of each first fan and each second fan, and if so, determining the fault grade of the first fan or the second fan according to preset judging conditions;
and controlling whether the first fan or the second fan is stopped according to the failure level of the first fan or the second fan.
In one possible implementation manner, before the obtaining the current rotation speeds of the first fans and the second fans, the method includes:
acquiring the current rotating speed of the second fan;
If the current rotating speed of each second fan in operation is smaller than or equal to the preset minimum rotating speed, acquiring the current air supply temperature at the first air outlet;
and if the current air supply temperature is smaller than the preset temperature and the preset time is maintained, controlling the second fans to be stopped in sequence according to the preset stopping sequence.
In one possible embodiment, the method further comprises:
Continuously acquiring the current air supply temperature at the first air outlet in the process of sequentially closing the second fans;
And if the current air supply temperature is not less than the preset temperature, controlling the second fan which is not stopped to keep running, and controlling the rotating speed of the second fan which is not stopped to gradually increase.
In one possible embodiment, the method further comprises:
after the rotating speed of the second fan which is not stopped is controlled to be gradually increased, continuously acquiring the current air supply temperature at the first air outlet and acquiring the current rotating speed of the second fan which is not stopped;
And if the current air supply temperature is not less than the preset temperature and the current rotating speed of the second fan which is not stopped is greater than or equal to the preset fan starting rotating speed, controlling the stopped second fan to start to operate according to the preset starting sequence.
Specifically, the operation control method of the indirect evaporative cooling air conditioning unit under the condition of low load may be as shown in fig. 5, and includes the following specific steps:
S401: acquiring the rotating speed of the current second fan;
S402: judging whether the current rotating speed of each second fan in operation is less than or equal to a preset minimum rotating speed; if yes, executing S403; if not, continuing to execute S401;
S403: acquiring the current air supply temperature at the second air outlet;
s404: judging whether the air supply temperature is less than a preset temperature and maintaining the preset time; if yes, executing S405; if not, executing S403;
s405: controlling the second fans in operation to be sequentially stopped according to a preset stopping sequence, and controlling the second air valves corresponding to the closed second fans to be closed;
S406: judging whether the air supply temperature is less than a preset temperature; if yes, continue to execute S405; if not, executing S407;
s407: controlling the second fan which is not stopped to keep running, and controlling the rotating speed of the second fan which is not stopped to gradually increase;
S408: judging that the current rotating speed of the second fan which is not stopped is greater than or equal to the starting rotating speed of the preset fan; if yes, then execute S408; if not, executing S407;
s408: and controlling the second fan which is stopped to start to operate according to a preset starting sequence.
Based on the same inventive concept, as shown in fig. 6, an embodiment of the present invention provides an operation control device of an indirect evaporative cooling air conditioning unit, including:
an obtaining unit 100, configured to obtain current rotation speeds of the first fans and the second fans;
A control unit 200 for:
And when the current rotating speed of any one of the first fans is zero, controlling the corresponding first air valve to be closed, and when the current rotating speed of any one of the second fans is zero, controlling the corresponding second air valve to be closed.
In a possible embodiment, before the current rotation speeds of the respective first fans and the respective second fans are obtained, the obtaining unit 100 is further configured to:
acquiring the body state information of each first fan and each second fan;
the control unit 200 is further configured to:
judging whether each first fan and each second fan have faults according to the body state information of each first fan and each second fan, and if so, determining the fault grade of the first fan or the second fan according to preset judging conditions;
and controlling whether the first fan or the second fan is stopped according to the failure level of the first fan or the second fan.
In a possible embodiment, before the current rotation speeds of the respective first fans and the respective second fans are obtained, the obtaining unit 100 is further configured to:
acquiring the current rotating speed of the second fan;
the control unit 200 is further configured to:
If the current rotating speed of each second fan in operation is smaller than or equal to the preset minimum rotating speed, acquiring the current air supply temperature at the first air outlet;
and if the current air supply temperature is smaller than the preset temperature and the preset time is maintained, controlling the second fans to be stopped in sequence according to the preset stopping sequence.
In a possible implementation, the acquisition unit 100 is further configured to:
Continuously acquiring the current air supply temperature at the first air outlet in the process of sequentially closing the second fans;
the control unit 200 is further configured to:
And if the current air supply temperature is not less than the preset temperature, controlling the second fan which is not stopped to keep running, and controlling the rotating speed of the second fan which is not stopped to gradually increase.
In a possible implementation, the acquisition unit 100 is further configured to:
after the rotating speed of the second fan which is not stopped is controlled to be gradually increased, continuously acquiring the current air supply temperature at the first air outlet and acquiring the current rotating speed of the second fan which is not stopped;
the control unit 200 is further configured to:
And if the current air supply temperature is not less than the preset temperature and the current rotating speed of the second fan which is not stopped is greater than or equal to the preset fan starting rotating speed, controlling the stopped second fan to start to operate according to the preset starting sequence.
It will be apparent to those skilled in the art that various modifications and variations can be made to the embodiments of the present invention without departing from the spirit and scope of the invention. Thus, it is intended that the present invention also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.

Claims (15)

1. An indirect evaporative cooling air conditioning unit, comprising:
The machine box comprises a first air channel and a second air channel for performing heat exchange with the first air channel, wherein two ends of the first air channel are respectively provided with a first air inlet for communicating with a machine room return air inlet and a first air outlet for communicating with a machine room air supply outlet, and two ends of the second air channel are respectively provided with a second air inlet and a second air outlet for communicating with outside air;
The first fan assembly comprises at least two first fans and first air valves which are arranged opposite to the first fans one by one, and the first fan assembly is arranged on the first air duct and adjacent to the first air inlet;
the second fan assembly comprises at least two second fans and second air valves which are arranged opposite to the second fans one by one, and the second fan assembly is arranged on the second air duct and is close to the second air outlet;
The rotating speed detection module is used for detecting the rotating speeds of the first fans and the second fans;
The controller is in signal connection with each first fan, each second fan, each first air valve, each second air valve and the rotating speed detection module, and is used for:
acquiring the current rotating speeds of the first fans and the second fans;
And when the current rotating speed of any one of the first fans is zero, controlling the corresponding first air valve to be closed, and when the current rotating speed of any one of the second fans is zero, controlling the corresponding second air valve to be closed.
2. The indirect evaporative cooling air conditioning unit of claim 1, further comprising an air-to-air heat exchanger in communication with both the first air duct and the second air duct to exchange heat with the first air duct and the second air duct.
3. The indirect evaporative cooling air conditioning unit of claim 2, further comprising a spray device including a nozzle located between the second fan assembly and the air-to-air heat exchanger.
4. The indirect evaporative cooling air conditioning unit of claim 3, wherein a water mist separator is located between the nozzle and the second fan assembly.
5. The indirect evaporative cooling air conditioning unit according to claim 4, wherein a first filter screen is disposed between the first fan assembly and the air-to-air heat exchanger, and a second filter screen is disposed between the second air inlet and the air-to-air heat exchanger.
6. The indirect evaporative cooling air conditioning unit according to claim 1, further comprising an alarm device for detecting a body state of each of the first fans and each of the second fans in operation, wherein the controller is in signal connection with the alarm device, and the controller is configured to:
acquiring the body state information of each first fan and each second fan;
judging whether each first fan and each second fan have faults according to the body state information of each first fan and each second fan, and if so, determining the fault grade of the first fan or the second fan according to preset judging conditions;
and controlling whether the first fan or the second fan is stopped according to the failure level of the first fan or the second fan.
7. The indirect evaporative cooling air conditioning unit according to claim 1, further comprising a temperature detection device, wherein the temperature detection device is configured to detect a current supply air temperature at the first air outlet, and the controller is configured to, before the controller is in signal connection with the temperature detection device and obtains the current rotational speeds of each of the first fans and each of the second fans:
acquiring the current rotating speed of the second fan;
If the current rotating speed of each second fan in operation is smaller than or equal to the preset minimum rotating speed, acquiring the current air supply temperature at the first air outlet;
and if the current air supply temperature is smaller than the preset temperature and the preset time is maintained, controlling the second fans to be stopped in sequence according to the preset stopping sequence.
8. The indirect evaporative cooling air conditioning unit of claim 7, wherein the controller is further configured to:
Continuously acquiring the current air supply temperature at the first air outlet in the process of sequentially closing the second fans;
And if the current air supply temperature is not less than the preset temperature, controlling the second fan which is not stopped to keep running, and controlling the rotating speed of the second fan which is not stopped to gradually increase.
9. The indirect evaporative cooling air conditioning unit of claim 8, wherein the controller is further configured to:
after the rotating speed of the second fan which is not stopped is controlled to be gradually increased, continuously acquiring the current air supply temperature at the first air outlet and acquiring the current rotating speed of the second fan which is not stopped;
And if the current air supply temperature is not less than the preset temperature and the current rotating speed of the second fan which is not stopped is greater than or equal to the preset fan starting rotating speed, controlling the stopped second fan to start to operate according to the preset starting sequence.
10. An operation control method applied to the indirect evaporative cooling air conditioning unit according to claim 1, characterized by comprising:
acquiring the current rotating speeds of the first fans and the second fans;
And when the current rotating speed of any one of the first fans is zero, controlling the corresponding first air valve to be closed, and when the current rotating speed of any one of the second fans is zero, controlling the corresponding second air valve to be closed.
11. The operation control method according to claim 10, wherein before the current rotation speeds of the respective first fans and the respective second fans are obtained, comprising:
acquiring the body state information of each first fan and each second fan;
judging whether each first fan and each second fan have faults according to the body state information of each first fan and each second fan, and if so, determining the fault grade of the first fan or the second fan according to preset judging conditions;
and controlling whether the first fan or the second fan is stopped according to the failure level of the first fan or the second fan.
12. The operation control method according to claim 10, wherein before the current rotation speeds of the respective first fans and the respective second fans are obtained, comprising:
acquiring the current rotating speed of the second fan;
If the current rotating speed of each second fan in operation is smaller than or equal to the preset minimum rotating speed, acquiring the current air supply temperature at the first air outlet;
and if the current air supply temperature is smaller than the preset temperature and the preset time is maintained, controlling the second fans to be stopped in sequence according to the preset stopping sequence.
13. The operation control method according to claim 12, characterized by further comprising:
Continuously acquiring the current air supply temperature at the first air outlet in the process of sequentially closing the second fans;
And if the current air supply temperature is not less than the preset temperature, controlling the second fan which is not stopped to keep running, and controlling the rotating speed of the second fan which is not stopped to gradually increase.
14. The operation control method according to claim 13, characterized by further comprising:
after the rotating speed of the second fan which is not stopped is controlled to be gradually increased, continuously acquiring the current air supply temperature at the first air outlet and acquiring the current rotating speed of the second fan which is not stopped;
And if the current air supply temperature is not less than the preset temperature and the current rotating speed of the second fan which is not stopped is greater than or equal to the preset fan starting rotating speed, controlling the stopped second fan to start to operate according to the preset starting sequence.
15. An operation control device applied to the indirect evaporative cooling air conditioning unit according to claim 1, characterized by comprising:
The acquisition unit is used for acquiring the current rotation speeds of the first fans and the second fans;
A control unit for:
And when the current rotating speed of any one of the first fans is zero, controlling the corresponding first air valve to be closed, and when the current rotating speed of any one of the second fans is zero, controlling the corresponding second air valve to be closed.
CN202010936311.4A 2020-09-08 2020-09-08 Indirect evaporative cooling air conditioning unit, and operation control method and device thereof Active CN114158233B (en)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN205919460U (en) * 2016-04-28 2017-02-01 苏州大学 Air conditioner purification device
CN107869928A (en) * 2017-12-12 2018-04-03 陈祖卫 Air heat exchanger and its refrigerating plant
CN109539443A (en) * 2018-12-27 2019-03-29 苏州英维克温控技术有限公司 A kind of indirect evaporating-cooling unit
CN109556219A (en) * 2018-11-12 2019-04-02 无锡欧龙德科技有限公司 Air quantity variable air conditioner unit and its control method
CN210035696U (en) * 2019-06-10 2020-02-07 珠海格力电器股份有限公司 Air conditioner indoor unit and multi-split air conditioning system

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN205919460U (en) * 2016-04-28 2017-02-01 苏州大学 Air conditioner purification device
CN107869928A (en) * 2017-12-12 2018-04-03 陈祖卫 Air heat exchanger and its refrigerating plant
CN109556219A (en) * 2018-11-12 2019-04-02 无锡欧龙德科技有限公司 Air quantity variable air conditioner unit and its control method
CN109539443A (en) * 2018-12-27 2019-03-29 苏州英维克温控技术有限公司 A kind of indirect evaporating-cooling unit
CN210035696U (en) * 2019-06-10 2020-02-07 珠海格力电器股份有限公司 Air conditioner indoor unit and multi-split air conditioning system

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