CN115200269B - Refrigerating system, cooling unit and control method of cooling unit - Google Patents

Refrigerating system, cooling unit and control method of cooling unit Download PDF

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Publication number
CN115200269B
CN115200269B CN202210863543.0A CN202210863543A CN115200269B CN 115200269 B CN115200269 B CN 115200269B CN 202210863543 A CN202210863543 A CN 202210863543A CN 115200269 B CN115200269 B CN 115200269B
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China
Prior art keywords
valve body
heat exchange
cooling unit
outdoor
indoor
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CN202210863543.0A
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Chinese (zh)
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CN115200269A (en
Inventor
汤厚文
卫鹏云
刘文登
江斌
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Midea Group Co Ltd
Hefei Midea Heating and Ventilating Equipment Co Ltd
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Midea Group Co Ltd
Hefei Midea Heating and Ventilating Equipment Co Ltd
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Priority to CN202210863543.0A priority Critical patent/CN115200269B/en
Publication of CN115200269A publication Critical patent/CN115200269A/en
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B41/00—Fluid-circulation arrangements
    • F25B41/40—Fluid line arrangements
    • 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
    • F24F11/62—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
    • F24F11/65—Electronic processing for selecting an operating mode
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B41/00—Fluid-circulation arrangements
    • F25B41/20—Disposition of valves, e.g. of on-off valves or flow control valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B41/00—Fluid-circulation arrangements
    • F25B41/30—Expansion means; Dispositions thereof
    • F25B41/37—Capillary tubes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D21/00—Defrosting; Preventing frosting; Removing condensed or defrost water
    • F25D21/04—Preventing the formation of frost or condensate
    • 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
    • F24F2110/10—Temperature
    • F24F2110/12—Temperature of the outside air
    • 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)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Thermal Sciences (AREA)
  • Signal Processing (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Fuzzy Systems (AREA)
  • Mathematical Physics (AREA)
  • Air Conditioning Control Device (AREA)

Abstract

A refrigerating system, a cooling unit and a control method thereof. The refrigeration system comprises a first heat exchange branch, a second heat exchange branch and a third heat exchange branch; the first heat exchange branch comprises a throttling component and a first heat exchanger which are sequentially connected in series; the second heat exchange branch comprises a first valve body, a first refrigerant driving part, a second heat exchanger and a second valve body which are sequentially connected in series, and the third heat exchange branch comprises a third valve body, a third heat exchanger, a second refrigerant driving part and a fourth valve body which are sequentially connected in series; the third heat exchanger is arranged to be installed on the outdoor air inlet side of the cooling unit; the first end of the first heat exchange branch is communicated with the second end of the second heat exchange branch and the second end of the third heat exchange branch, and the second end of the first heat exchange branch is communicated with the first end of the second heat exchange branch and the first end of the third heat exchange branch; the condensation or icing problem existing when low-temperature air enters the heat exchange core body under the condition of extremely low ambient temperature can be solved.

Description

Refrigerating system, cooling unit and control method of cooling unit
Technical Field
The invention relates to the field of heating ventilation air conditioning equipment, in particular to a refrigerating system, a cooling unit and a control method thereof.
Background
The cooling energy consumption of the data center is very high, and accounts for about 30% of the total energy consumption of the data center. With the development and maturity of science and technology, in order to solve the problem of high energy consumption of data center, indirect evaporative cooling units have been developed and widely used in industry. At present, an indirect evaporative cooling unit in the industry can normally and reliably operate in most environments, but under the condition of extremely low ambient temperature, condensation or icing can be generated when low-temperature air enters a heat exchange core body in the indirect evaporative cooling unit, so that the service life of the heat exchange core body of the unit can be shortened, and the normal operation of the unit is influenced.
Disclosure of Invention
The invention mainly aims to provide a refrigerating system which is applied to a cooling unit and can solve the problem that condensation or icing occurs when low-temperature air enters a heat exchange core of the cooling unit under the condition of extremely low ambient temperature.
In order to achieve the above objective, a refrigeration system for a cooling unit according to an embodiment of the present invention includes a first heat exchange branch, a second heat exchange branch, and a third heat exchange branch; the first heat exchange branch comprises a throttling component and a first heat exchanger which are sequentially connected in series; the second heat exchange branch comprises a first valve body, a first refrigerant driving part, a second heat exchanger and a second valve body which are sequentially connected in series, and the third heat exchange branch comprises a third valve body, a third heat exchanger, a second refrigerant driving part and a fourth valve body which are sequentially connected in series; the third heat exchanger is arranged to be installed on the outdoor air inlet side of the cooling unit; the first end of the first heat exchange branch is communicated with the second end of the second heat exchange branch and the second end of the third heat exchange branch, and the second end of the first heat exchange branch is communicated with the first end of the second heat exchange branch and the first end of the third heat exchange branch.
In an exemplary embodiment, the third heat exchanger and the second refrigerant driving part are located between the third valve body and the fourth valve body.
In an exemplary embodiment, the second refrigerant driving part is a fluorine pump, and the fluorine pump is located between the fourth valve body and the third heat exchanger.
In an exemplary embodiment, the second refrigerant driving part is a compressor, and the compressor is located between the third valve body and the third heat exchanger.
In an exemplary embodiment, the first refrigerant driving part is a compressor, the first valve body, the second valve body, the third valve body and the fourth valve body are all on-off valves, and the throttling part is an electronic expansion valve.
The cooling unit provided by the embodiment of the invention comprises an indirect evaporation heat exchange system and the refrigerating system for the cooling unit, wherein the indirect evaporation heat exchange system comprises a heat exchange core body, the heat exchange core body is provided with an outdoor air duct and an indoor air duct, and the third heat exchanger is arranged at an air inlet of the outdoor air duct.
In an exemplary embodiment, the cooling unit further includes an indoor air supply duct, an indoor return air duct, an outdoor air supply duct, an outdoor air outlet duct, an indoor fan and an outdoor fan, the indoor air duct is communicated with the indoor air supply duct and the indoor return air duct, the outdoor air duct is communicated with the outdoor air supply duct and the outdoor air outlet duct, the first heat exchanger and the indoor fan are located in the indoor air supply duct, the second heat exchanger and the outdoor fan are located in the outdoor air outlet duct, and the third heat exchanger is located in the outdoor air inlet duct.
In an exemplary embodiment, the indirect evaporative heat exchange system further includes a spray device having a spray line including a spray pump and a spray pipe connected in series, the spray pipe being located between the third heat exchanger and the outdoor air duct.
The control method of the cooling unit provided by the embodiment of the invention comprises the following steps: and opening the second refrigerant driving part, the third valve body and the fourth valve body based on executing the first working mode, and closing the first valve body and the second valve body.
In an exemplary embodiment, the control method further includes: acquiring a dry bulb temperature To of outdoor air;
judging whether the first temperature judging condition To < To2 is met, wherein To2 is a second temperature threshold;
if the first temperature judging condition is judged to be met, generating an instruction for executing the first working mode;
wherein the indoor fan and the outdoor fan are also turned on based on executing the first operation mode.
In an exemplary embodiment, the control method further includes: and on the basis of executing a second working mode, opening the indoor fan and the outdoor fan, and closing the first refrigerant driving part, the second refrigerant driving part, the first valve body, the second valve body, the third valve body and the fourth valve body.
In an exemplary embodiment, the control method further includes: acquiring a dry bulb temperature To of outdoor air;
judging whether the second temperature judgment condition To2 is less than or equal To To < To1, wherein To1 is a first temperature threshold value, and To2 is a second temperature threshold value;
if it is determined that the second temperature determination condition is satisfied, an instruction to execute the second operation mode is generated.
In an exemplary embodiment, the control method further includes: and on the basis of executing a third working mode, starting the spray pump, the indoor fan and the outdoor fan, and closing the first refrigerant driving part, the second refrigerant driving part, the first valve body, the second valve body, the third valve body and the fourth valve body.
In an exemplary embodiment, the control method further includes: acquiring a dry bulb temperature To and a wet bulb temperature To of outdoor air;
judging whether a third temperature judgment condition To is more than or equal To To1 and whether Tow < Tow1 is met, wherein To1 is a first temperature threshold and Tow1 is a third temperature threshold;
if it is determined that the third temperature determination condition is satisfied, an instruction to execute the third operation mode is generated.
In an exemplary embodiment, the control method further includes: and on the basis of executing a fourth working mode, starting the spray pump, the indoor fan, the outdoor fan, the first refrigerant driving component, the first valve body and the second valve body, and closing the second refrigerant driving component, the third valve body and the fourth valve body.
In an exemplary embodiment, the control method further includes: acquiring a wet bulb temperature Tow of outdoor air;
judging whether the fourth temperature judging condition Tow is more than or equal to Tow1 or not, wherein Tow1 is a third temperature threshold;
if it is determined that the fourth temperature determination condition is satisfied, an instruction to execute the fourth operation mode is generated.
In the technical scheme of the invention, the refrigerating system is applied to the cooling unit, the third heat exchanger is arranged on the outdoor air inlet side of the cooling unit, the second refrigerant driving component, the third valve body, the fourth valve body, the indoor fan of the cooling unit and the outdoor fan of the cooling unit are started under the condition of extremely low ambient temperature, the first valve body and the second valve body are closed, the refrigerant flows in a circulating passage formed by the first heat exchange branch and the third heat exchange branch, and the temperature of the first heat exchanger is lower than that of the third heat exchanger; under the action of an indoor fan and an outdoor fan, outdoor air flowing from the outside to the heat exchange core body firstly exchanges heat with the third heat exchanger and heats up, then enters the heat exchange core body and indoor air conveyed in the heat exchange core body to exchange heat (cool the indoor air), so that the heat exchange core body is prevented from condensation or icing; meanwhile, in order to avoid the cooling effect of the indoor air from being reduced due to the fact that the outdoor air enters the heat exchange core body after being preheated, the indoor air subjected to heat exchange through the heat exchange core body is subjected to heat exchange and cooling with the first heat exchanger in the indoor process, and therefore the cooling effect of the indoor air is guaranteed.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to the structures shown in these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic block diagram of a cooling unit according to an embodiment of the present invention in a first operation mode;
FIG. 2 is a schematic diagram of a cooling unit in a first mode of operation;
FIG. 3 is a schematic block diagram of a cooling unit in a second mode of operation according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of the cooling unit in a second mode of operation;
FIG. 5 is a schematic block diagram illustrating a cooling unit in a third mode of operation according to an embodiment of the present invention;
FIG. 6 is a schematic diagram of the cooling unit in a third mode of operation;
FIG. 7 is a schematic block diagram illustrating a cooling unit in a fourth mode of operation according to an embodiment of the present invention;
FIG. 8 is a schematic view of the cooling unit in a fourth mode of operation;
fig. 9 is a schematic block diagram of a cooling unit according to another embodiment of the present invention.
The correspondence between the reference numerals and the component names in fig. 1 to 9 is:
100 first heat exchange branch, 110 throttle component, 120 first heat exchanger, 200 second heat exchange branch, 210 first valve body, 220 first refrigerant driving component, 230 second heat exchanger, 240 second valve body, 300 third heat exchange branch, 310 third valve body, 320 third heat exchanger, 330 second refrigerant driving component, 340 fourth valve body, 400 indirect evaporation heat exchange system, 410 heat exchange core, 420 spray pipeline, 421 spray pump, 422 spray pipe, 430 water pan, 510 indoor air supply channel, 520 indoor return air channel, 610 outdoor air inlet channel, 620 outdoor air outlet channel, 710 indoor fan, 720 outdoor fan, 800 electric heater.
The achievement of the objects, functional features and advantages of the present invention will be further described with reference to the accompanying drawings, in conjunction with the embodiments.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the invention. 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.
It should be noted that all directional indicators (such as up, down, left, right, front, and rear … …) in the embodiments of the present invention are merely used to explain the relative positional relationship, movement, etc. between the components in a particular posture (as shown in the drawings), and if the particular posture is changed, the directional indicator is changed accordingly.
Furthermore, descriptions such as those referred to as "first," "second," and the like, are provided for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implying an order of magnitude of the indicated technical features in the present disclosure. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present invention, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.
In the present invention, unless specifically stated and limited otherwise, the terms "connected," "fixed," and the like are to be construed broadly, and for example, "fixed" may be either in fixed communication or in removable communication, or as a unit; may be in mechanical communication or in electrical communication; "coupled" may be directly connected or indirectly connected through intervening media, and may be in the internal communication of two elements or in the interaction of two elements, unless expressly defined otherwise. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
In addition, the technical solutions of the embodiments of the present invention may be combined with each other, but it is necessary to be based on the fact that those skilled in the art can implement the technical solutions, and when the technical solutions are contradictory or cannot be implemented, the combination of the technical solutions should be considered as not existing, and not falling within the scope of protection claimed by the present invention.
As shown in fig. 1, 3, 5 and 7, a refrigeration system for a cooling unit according to an embodiment of the present invention includes a first heat exchange branch 100, a second heat exchange branch 200 and a third heat exchange branch 300; the first heat exchange branch 100 comprises a throttling part 110 and a first heat exchanger 120 which are sequentially connected in series; the second heat exchange branch 200 comprises a first valve body 210, a first refrigerant driving part 220, a second heat exchanger 230 and a second valve body 240 which are sequentially connected in series, the third heat exchange branch 300 comprises a third valve body 310, a third heat exchanger 320, a second refrigerant driving part 330 and a fourth valve body 340 which are sequentially connected in series, and the third heat exchanger 320 is arranged to be installed on the outdoor air inlet side of the cooling unit; wherein, the inlet end of the first heat exchange branch 100 is communicated with the outlet end of the second heat exchange branch 200 and the outlet end of the third heat exchange branch 300, and the outlet end of the first heat exchange branch 100 is communicated with the inlet end of the second heat exchange branch 200 and the inlet end of the third heat exchange branch 300.
As shown in fig. 1 and 2, the refrigeration system is applied to a cooling unit, a third heat exchanger 320 is installed at an outdoor air intake side of the cooling unit, a second refrigerant driving part 330, a third valve body 310, a fourth valve body 340, an indoor fan 710 of the cooling unit and an outdoor fan 720 of the cooling unit are opened in case of an extremely low ambient temperature, a first valve body 210 and a second valve body 240 are closed, a refrigerant flows (pumps) in a circulation path formed by the first heat exchange branch 100 and the third heat exchange branch 300, and the temperature of the first heat exchanger 120 is lower than that of the third heat exchanger 320; under the action of the indoor fan 710 and the outdoor fan 720, the outdoor air flowing to the heat exchange core 410 of the cooling unit from the outside firstly exchanges heat with the third heat exchanger 320 to raise temperature, and then enters the heat exchange core 410 to exchange heat with the indoor air conveyed in the heat exchange core 410 (cool the indoor air), so as to prevent the condensation or icing of the heat exchange core 410; meanwhile, in order to avoid the cooling effect of the indoor air from being reduced due to the fact that the outdoor air enters the heat exchange core 410 after being preheated, the indoor air subjected to heat exchange through the heat exchange core 410 is subjected to heat exchange and cooling with the first heat exchanger 120 in the indoor process, so that the cooling effect of the indoor air is guaranteed.
As shown in fig. 1, 3, 5 and 7, the third heat exchanger 320 and the second refrigerant driving part 330 are located between the third valve body 310 and the fourth valve body 340, and the second refrigerant driving part 330 is provided as a fluorine pump located between the fourth valve body 340 and the third heat exchanger 320, that is, the third valve body 310, the third heat exchanger 320, the fluorine pump and the fourth valve body 340 are sequentially connected in series; alternatively, the second refrigerant driving part 330 may be configured as a compressor, and the compressor is located between the third valve body 310 and the third heat exchanger 320, that is, the third valve body 310, the compressor, the third heat exchanger 320, and the fourth valve body 340 are sequentially connected in series; the foregoing may all achieve the purpose of the present application, and the spirit of the present application is not departing from the design concept of the present invention, and the disclosure is not repeated herein, and all the purpose should be within the protection scope of the present application.
This a refrigerating system for cooling unit, second heat transfer branch road 200 and third heat transfer branch road 300 share first heat transfer branch road 100, simple structure, required refrigeration part is less, under the prerequisite that does not seriously influence the heat exchange efficiency of unit, has solved the problem that the heat exchange core congeals and freezes under the abominable condition of low temperature.
In an exemplary embodiment, as shown in fig. 1, 3, 5 and 7, the third heat exchanger 320 and the second refrigerant driving part 330 are located between the third valve body 310 and the fourth valve body 340, and the first refrigerant driving part 220 is configured as a compressor, the first valve body 210, the second valve body 240, the third valve body 310 and the fourth valve body 340 are all configured as switching valves, the switching valves are configured as electrically controlled switching valves (e.g., solenoid valves), and the throttling part 110 is configured as an electronic expansion valve or capillary tube.
Of course, it is also possible to: as shown in fig. 9, the third heat exchange branch 300 is replaced by an electric heater 800, and the outdoor air entering the heat exchange core 410 is heated by the electric heater 800 under the condition of extremely low ambient temperature, so that the purpose of the present application can be achieved.
As shown in fig. 1 to 8, the cooling unit according to the embodiment of the present invention includes an indirect evaporation heat exchange system 400 and the refrigeration system according to any of the foregoing embodiments, where the indirect evaporation heat exchange system 400 includes a heat exchange core 410, the heat exchange core 410 has an outdoor air duct and an indoor air duct, and the third heat exchanger 320 is installed at an air inlet of the outdoor air duct.
As shown in fig. 1 and 2, in the cooling unit, the third heat exchanger 320 is installed at the air inlet of the outdoor air duct, the second refrigerant driving part 330, the third valve body 310 and the fourth valve body 340 are opened, the first valve body 210 and the second valve body 240 are closed, the refrigerant flows in the circulation path formed by the first heat exchange branch 100 and the third heat exchange branch 300, and the temperature of the first heat exchanger 120 is lower than that of the third heat exchanger 320 under the condition of extremely low ambient temperature; the outdoor air flowing from the outside to the outdoor air duct exchanges heat with the third heat exchanger 320 to raise temperature, and then enters the outdoor air duct to exchange heat with the indoor air conveyed in the indoor air duct (the indoor air is cooled, the temperature of the indoor air in the indoor air duct is lowered, and the temperature of the outdoor air in the outdoor air duct is raised again), so that condensation or icing of the heat exchange core 410 is prevented; meanwhile, in order to avoid the cooling effect of indoor air in the indoor air duct from being reduced due to the fact that the outdoor air enters the outdoor air duct after being preheated, the indoor air subjected to heat exchange in the indoor air duct is subjected to heat exchange with the first heat exchanger 120 to cool, and therefore the cooling effect of the indoor air is guaranteed.
In an exemplary embodiment, as shown in fig. 1, 3, 5 and 7, the cooling unit further includes an indoor air supply duct 510, an indoor return air duct 520, an outdoor air supply duct 610, an outdoor air outlet duct 620, an indoor fan 710 and an outdoor fan 720, the indoor air duct communicates with the indoor air supply duct 510 and the indoor return air duct 520, the outdoor air duct communicates with the outdoor air supply duct 610 and the outdoor air outlet duct 620, the first heat exchanger 120 and the indoor fan 710 are located in the indoor air supply duct 510, the second heat exchanger 230 and the outdoor fan 720 are located in the outdoor air duct 620, and the third heat exchanger 320 is located in the outdoor air supply duct 610.
As shown in fig. 1 and 2, in the cooling unit, the first heat exchanger 120 and the indoor fan 710 are located in the indoor air supply duct 510, the second heat exchanger 230 and the outdoor fan 720 are located in the outdoor air supply duct 620, the third heat exchanger 320 is located in the outdoor air supply duct 610, the second refrigerant driving part 330, the third valve body 310, the fourth valve body 340, the indoor fan 710 and the outdoor fan 720 are opened under the condition of extremely low ambient temperature, the first valve body 210 and the second valve body 240 are closed, the refrigerant flows in the circulation path formed by the first heat exchange branch 100 and the third heat exchange branch 300, and the temperature of the first heat exchanger 120 is lower than that of the third heat exchanger 320; the outdoor air entering the outdoor air inlet duct 610 from the outside firstly exchanges heat with the third heat exchanger 320 to raise temperature, then enters the outdoor air duct and exchanges heat with the indoor air conveyed in the indoor air duct (the indoor air in the indoor air duct is cooled, the temperature of the indoor air in the indoor air duct is lowered, and the temperature of the outdoor air in the outdoor air duct is raised again), so that the heat exchange core 410 is prevented from being condensed or frozen, and the outdoor air in the outdoor air duct after heat exchange is discharged to the outside from the outdoor air outlet duct 620; meanwhile, in order to avoid the cooling effect of indoor air in the indoor air duct from being reduced due to the fact that the outdoor air enters the outdoor air duct after being preheated, the indoor air subjected to heat exchange in the indoor air duct is subjected to heat exchange with the first heat exchanger 120 and then is cooled in the indoor air duct 510, and therefore the cooling effect of the indoor air is guaranteed.
In an exemplary embodiment, as shown in fig. 1, 3, and 5 to 8, the indirect evaporative heat exchange system 400 further includes a spray device having a spray line 420, the spray line 420 including a spray pump 421 and a spray pipe 422 connected in series, a portion of the spray pipe 422 being located between the third heat exchanger 320 and the outdoor air duct, and the spray nozzle of the spray pipe 422 spraying the cooling liquid into the outdoor air duct, the cooling liquid being set as water. The spray device further comprises a water receiving disc 430, wherein the water receiving disc 430 is positioned below the heat exchange core 410, and the spray pump 421 is communicated with a water outlet of the water receiving disc 430.
As shown in fig. 3 and 4, when the outdoor air temperature is low but insufficient to cause dew condensation or ice formation of the heat exchange core 410, the indoor fan 710 and the outdoor fan 720 are turned on, and the first refrigerant driving part 220, the second refrigerant driving part 330, the first valve body 210, the second valve body 240, the third valve body 310 and the fourth valve body 340 are closed. Under the action of the outdoor fan 720, outdoor air passes through the outdoor air inlet duct 610, the outdoor air duct, the outdoor air outlet duct 620 and the outdoor environment to finish outdoor air circulation; under the action of the indoor fan 710, indoor air passes through the indoor return air duct 520, the indoor air duct, the indoor air supply duct 510 and the indoor environment to finish indoor air circulation; in this process, the outdoor air and the indoor air exchange heat through the heat exchange core 410, so as to cool the indoor air.
As shown in fig. 5 and 6, in the transitional season, when the outdoor air temperature is not low enough, the spray pump 421, the indoor fan 710, and the outdoor fan 720 are turned on, and the first refrigerant driving part 220, the second refrigerant driving part 330, the first valve body 210, the second valve body 240, the third valve body 310, and the fourth valve body 340 are turned off. Under the action of the outdoor fan 720, outdoor air completes outdoor air circulation through the outdoor air inlet duct 610, the outdoor air duct, the outdoor air outlet duct 620 and the outdoor environment, and the spray pipe 422 sprays water into the outdoor air duct; under the action of the indoor fan 710, indoor air passes through the indoor return air duct 520, the indoor air duct, the indoor air supply duct 510 and the indoor environment to finish indoor air circulation; in the process, the outdoor air and the indoor air exchange heat through the heat exchange core 410, so that the indoor air is cooled, and the spray water cools the indoor air in the indoor air duct through evaporative cooling refrigeration.
As shown in fig. 7 and 8, when the outdoor air temperature is high, the spray pump 421, the indoor fan 710, the outdoor fan 720, the first refrigerant driving part 220, the first valve body 210 and the second valve body 240 are turned on, the second refrigerant driving part 330, the third valve body 310 and the fourth valve body 340 are turned off, the refrigerant flows in the circulation path formed by the first heat exchange branch 100 and the second heat exchange branch 200, and the temperature of the first heat exchanger 120 is lower than that of the second heat exchanger 230. Under the action of the outdoor fan 720, outdoor air completes outdoor air circulation through the outdoor air inlet duct 610, the outdoor air duct, the outdoor air outlet duct 620 and the outdoor environment, and the spray pipe 422 sprays water into the outdoor air duct; under the action of the indoor fan 710, indoor air passes through the indoor return air duct 520, the indoor air duct, the indoor supply air duct 510 and the indoor environment to complete indoor air circulation. The outdoor air entering the outdoor air duct from the outside exchanges heat with the indoor air conveyed in the indoor air duct, cools the indoor air, and the outdoor air discharged from the outdoor air duct cools the second heat exchanger 230; the spray pipe 422 sprays water into the outdoor air duct, and the spray water cools indoor air in the indoor air duct through evaporative cooling refrigeration; in the process of entering the room, the indoor air after heat exchange in the indoor air duct exchanges heat with the first heat exchanger 120 to cool.
The control method (not shown in the figure) of the cooling unit provided by the embodiment of the invention comprises the following steps: based on the execution of the first operation mode (indirect air-air heat exchange natural cooling and fluorine pump system mixing mode), the second refrigerant driving part 330, the third valve body 310 and the fourth valve body 340 are opened, and the first valve body 210 and the second valve body 240 are closed.
As shown in fig. 1 and 2, in the control method of the cooling unit, the third heat exchanger 320 is installed at the air inlet of the outdoor air duct, under the condition of extremely low ambient temperature, the first operation mode is performed, the second refrigerant driving part 330, the third valve body 310 and the fourth valve body 340 are opened, the first valve body 210 and the second valve body 240 are closed, the refrigerant flows in the circulation path formed by the first heat exchange branch 100 and the third heat exchange branch 300, and the temperature of the first heat exchanger 120 is lower than that of the third heat exchanger 320; the outdoor air flowing from the outside to the outdoor air duct exchanges heat with the third heat exchanger 320 to raise temperature, and then enters the outdoor air duct to exchange heat with the indoor air conveyed in the indoor air duct (the indoor air is cooled, the temperature of the indoor air in the indoor air duct is lowered, and the temperature of the outdoor air in the outdoor air duct is raised again), so that condensation or icing of the heat exchange core 410 is prevented; meanwhile, in order to avoid the cooling effect of indoor air in the indoor air duct from being reduced due to the fact that the outdoor air enters the outdoor air duct after being preheated, the indoor air subjected to heat exchange in the indoor air duct is subjected to heat exchange with the first heat exchanger 120 to cool, and therefore the cooling effect of the indoor air is guaranteed.
In an example, the control method further comprises: acquiring a dry bulb temperature To of outdoor air;
judging whether the first temperature judging condition To < To2 is met, wherein To2 is a second temperature threshold;
if the first temperature judging condition is judged to be met, generating an instruction for executing the first working mode;
wherein, when the second refrigerant driving part 330, the third valve body 310 and the fourth valve body 340 are opened and the first valve body 210 and the second valve body 240 are closed, the indoor fan 710 and the outdoor fan 720 are also opened together.
The establishment of the first temperature determination condition indicates that the outside ambient temperature is extremely low.
In one embodiment, a control method of a cooling unit includes:
acquiring a dry bulb temperature To of outdoor air;
judging whether the first temperature judging condition To < To2 is met, wherein To2 is a second temperature threshold;
when it is determined that the first temperature determination condition is satisfied, the second refrigerant driving part 330, the third valve element 310, the fourth valve element 340, the indoor fan 710, and the outdoor fan 720 are opened, and the first valve element 210 and the second valve element 240 are closed.
In an exemplary embodiment, the control method further includes: based on the execution of the second operation mode (indirect wind-wind heat exchange natural cooling mode), the indoor fan 710 and the outdoor fan 720 are turned on, and the first refrigerant driving part 220, the second refrigerant driving part 330, the first valve body 210, the second valve body 240, the third valve body 310 and the fourth valve body 340 are turned off.
As shown in fig. 3 and 4, when the outdoor air temperature is low but insufficient to cause dew condensation or icing of the heat exchange core 410, the second operation mode is performed, the indoor fan 710 and the outdoor fan 720 are turned on, and the first refrigerant driving part 220, the second refrigerant driving part 330, the first valve body 210, the second valve body 240, the third valve body 310 and the fourth valve body 340 are turned off. Under the action of the outdoor fan 720, outdoor air passes through the outdoor air inlet duct 610, the outdoor air duct, the outdoor air outlet duct 620 and the outdoor environment to finish outdoor air circulation; under the action of the indoor fan 710, indoor air passes through the indoor return air duct 520, the indoor air duct, the indoor air supply duct 510 and the indoor environment to finish indoor air circulation; in this process, the outdoor air and the indoor air exchange heat through the heat exchange core 410, so as to cool the indoor air.
In an example, the control method further comprises: acquiring a dry bulb temperature To of outdoor air;
judging whether the second temperature judgment condition To2 is less than or equal To To < To1, wherein To1 is a first temperature threshold value, and To2 is a second temperature threshold value;
if it is determined that the second temperature determination condition is satisfied, an instruction to execute the second operation mode is generated.
Wherein the establishment of the second temperature determination condition indicates that the outdoor air temperature is low, but insufficient to cause condensation or icing of the heat exchange core 410.
In one embodiment, a control method of a cooling unit includes:
acquiring a dry bulb temperature To of outdoor air;
judging whether the second temperature judgment condition To2 is less than or equal To To < To1, wherein To1 is a first temperature threshold value, and To2 is a second temperature threshold value;
when it is determined that the second temperature determination condition is satisfied, the indoor fan 710 and the outdoor fan 720 are turned on, and the first refrigerant driving part 220, the second refrigerant driving part 330, the first valve body 210, the second valve body 240, the third valve body 310, and the fourth valve body 340 are turned off.
In an exemplary embodiment, the control method further includes: based on the execution of the third operation mode (indirect evaporation natural cooling mode), the spray pump 421, the indoor fan 710, and the outdoor fan 720 are turned on, and the first refrigerant driving part 220, the second refrigerant driving part 330, the first valve body 210, the second valve body 240, the third valve body 310, and the fourth valve body 340 are turned off.
As shown in fig. 5 and 6, in the transitional season, when the outdoor air temperature is not low enough, the third operation mode is performed, the spray pump 421, the indoor fan 710, and the outdoor fan 720 are turned on, and the first refrigerant driving part 220, the second refrigerant driving part 330, the first valve body 210, the second valve body 240, the third valve body 310, and the fourth valve body 340 are turned off. Under the action of the outdoor fan 720, outdoor air completes outdoor air circulation through the outdoor air inlet duct 610, the outdoor air duct, the outdoor air outlet duct 620 and the outdoor environment, and the spray pipe 422 sprays water into the outdoor air duct; under the action of the indoor fan 710, indoor air passes through the indoor return air duct 520, the indoor air duct, the indoor air supply duct 510 and the indoor environment to finish indoor air circulation; in the process, the outdoor air and the indoor air exchange heat through the heat exchange core 410, so that the indoor air is cooled, and the spray water cools the indoor air in the indoor air duct through evaporative cooling refrigeration.
In an example, the control method further comprises: acquiring a dry bulb temperature To and a wet bulb temperature To of outdoor air;
judging whether a third temperature judgment condition To is more than or equal To To1 and whether Tow < Tow1 is met, wherein To1 is a first temperature threshold and Tow1 is a third temperature threshold;
if it is determined that the third temperature determination condition is satisfied, an instruction to execute the third operation mode is generated.
Wherein the establishment of the third temperature determination condition indicates that the outdoor air temperature is not sufficiently low in the transition season.
In one embodiment, a control method of a cooling unit includes:
acquiring a dry bulb temperature To and a wet bulb temperature To of outdoor air;
judging whether a third temperature judgment condition To is more than or equal To To1 and whether Tow < Tow1 is met, wherein To1 is a first temperature threshold and Tow1 is a third temperature threshold;
when it is determined that the third temperature determination condition is satisfied, the shower pump 421, the indoor fan 710, and the outdoor fan 720 are turned on, and the first refrigerant driving part 220, the second refrigerant driving part 330, the first valve body 210, the second valve body 240, the third valve body 310, and the fourth valve body 340 are turned off.
In an exemplary embodiment, the control method further includes: based on the fourth operation mode (indirect evaporative cooling and compressor mechanical refrigeration mixing mode), the spray pump 421, the indoor fan 710, the outdoor fan 720, the first refrigerant driving part 220, the first valve body 210 and the second valve body 240 are turned on, and the second refrigerant driving part 330, the third valve body 310 and the fourth valve body 340 are turned off.
As shown in fig. 7 and 8, when the outdoor air temperature is high, the fourth operation mode is performed, the spray pump 421, the indoor fan 710, the outdoor fan 720, the first refrigerant driving part 220, the first valve body 210 and the second valve body 240 are turned on, the second refrigerant driving part 330, the third valve body 310 and the fourth valve body 340 are turned off, the refrigerant flows in the circulation path formed by the first heat exchange branch 100 and the second heat exchange branch 200, and the temperature of the first heat exchanger 120 is lower than that of the second heat exchanger 230. Under the action of the outdoor fan 720, outdoor air completes outdoor air circulation through the outdoor air inlet duct 610, the outdoor air duct, the outdoor air outlet duct 620 and the outdoor environment, and the spray pipe 422 sprays water into the outdoor air duct; under the action of the indoor fan 710, indoor air passes through the indoor return air duct 520, the indoor air duct, the indoor supply air duct 510 and the indoor environment to complete indoor air circulation. The outdoor air entering the outdoor air duct from the outside exchanges heat with the indoor air conveyed in the indoor air duct to cool the indoor air, and the discharged outdoor air of the outdoor air duct cools the second heat exchanger 230; the spray pipe 422 sprays water into the outdoor air duct, and the spray water cools indoor air in the indoor air duct through evaporative cooling refrigeration; in the process of entering the room, the indoor air after heat exchange in the indoor air duct exchanges heat with the first heat exchanger 120 to cool.
In an exemplary embodiment, the control method further includes: acquiring a wet bulb temperature Tow of outdoor air;
judging whether the fourth temperature judging condition Tow is more than or equal to Tow1 or not, wherein Tow1 is a third temperature threshold;
if it is determined that the fourth temperature determination condition is satisfied, an instruction to execute the fourth operation mode is generated.
Wherein the satisfaction of the fourth temperature determination condition indicates that the outdoor air temperature is high.
In one embodiment, a control method of a cooling unit includes:
acquiring a wet bulb temperature Tow of outdoor air;
judging whether the fourth temperature judging condition Tow is more than or equal to Tow1 or not, wherein Tow1 is a third temperature threshold;
when it is determined that the fourth temperature determination condition is satisfied, the spray pump 421, the indoor fan 710, the outdoor fan 720, the first refrigerant driving part 220, the first valve body 210 and the second valve body 240 are turned on,
the second refrigerant driving part 330, the third valve body 310 and the fourth valve body 340 are closed.
In summary, in the technical scheme of the invention, the refrigeration system is applied to the cooling unit, the third heat exchanger is arranged on the outdoor air inlet side of the cooling unit, the second refrigerant driving component, the third valve body, the fourth valve body, the indoor fan of the cooling unit and the outdoor fan of the cooling unit are started under the condition of extremely low ambient temperature, the first valve body and the second valve body are closed, the refrigerant flows in a circulation passage formed by the first heat exchange branch and the third heat exchange branch, and the temperature of the first heat exchanger is lower than that of the third heat exchanger; under the action of an indoor fan and an outdoor fan, outdoor air flowing from the outside to the heat exchange core body firstly exchanges heat with the third heat exchanger and heats up, then enters the heat exchange core body and indoor air conveyed in the heat exchange core body to exchange heat (cool the indoor air), so that the heat exchange core body is prevented from condensation or icing; meanwhile, in order to avoid the cooling effect of the indoor air from being reduced due to the fact that the outdoor air enters the heat exchange core body after being preheated, the indoor air subjected to heat exchange through the heat exchange core body is subjected to heat exchange and cooling with the first heat exchanger in the indoor process, and therefore the cooling effect of the indoor air is guaranteed.
In the description of the present invention, it should be noted that, directions or positional relationships indicated by terms "upper", "lower", "one side", "the other side", "one end", "the other end", "the side", "the opposite", "four corners", "the periphery", "the" mouth "character structure", etc., are directions or positional relationships based on the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the structures referred to have a specific direction, are configured and operated in a specific direction, and thus are not to be construed as limiting the present invention.
In the description of embodiments of the present invention, unless explicitly specified and limited otherwise, the terms "connected," "directly connected," "indirectly connected," "fixedly connected," "mounted," "assembled" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; the terms "mounted," "connected," "fixedly connected," and "coupled" may be directly or indirectly connected through intervening media, or may be in communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
Although the embodiments of the present invention are described above, the embodiments are only used for facilitating understanding of the present invention, and are not intended to limit the present invention. Any person skilled in the art can make any modification and variation in form and detail without departing from the spirit and scope of the present disclosure, but the scope of the present disclosure is defined by the appended claims.
The foregoing description is only of the preferred embodiments of the present invention and is not intended to limit the scope of the invention, and all equivalent structural changes made by the specification and drawings of the present invention or direct/indirect application in other related technical fields are included in the scope of the present invention.

Claims (13)

1. A refrigeration system for a cooling unit, comprising a first heat exchange branch, a second heat exchange branch and a third heat exchange branch;
the first heat exchange branch comprises a throttling component and a first heat exchanger which are sequentially connected in series;
the second heat exchange branch comprises a first valve body, a first refrigerant driving part, a second heat exchanger and a second valve body which are sequentially connected in series, and the third heat exchange branch comprises a third valve body, a third heat exchanger, a second refrigerant driving part and a fourth valve body which are sequentially connected in series;
the third heat exchanger is arranged to be installed on the outdoor air inlet side of the cooling unit;
the first end of the first heat exchange branch is communicated with the second end of the second heat exchange branch and the second end of the third heat exchange branch, the second end of the first heat exchange branch is communicated with the first end of the second heat exchange branch and the first end of the third heat exchange branch, and the first refrigerant driving component is a compressor;
the second refrigerant driving component is a fluorine pump, the third heat exchanger is positioned between the fluorine pump and the third valve body, and the fluorine pump is positioned between the fourth valve body and the third heat exchanger; or (b)
The second refrigerant driving component is a compressor, the third heat exchanger is located between the compressor and the fourth valve body, and the compressor is located between the third valve body and the third heat exchanger.
2. The refrigeration system of claim 1, wherein the first valve body, the second valve body, the third valve body, and the fourth valve body are on-off valves, and the throttling element is an electronic expansion valve.
3. A cooling unit comprising an indirect evaporative heat exchange system and the refrigeration system for a cooling unit according to claim 1 or 2, wherein the indirect evaporative heat exchange system comprises a heat exchange core body, the heat exchange core body is provided with an outdoor air duct and an indoor air duct, and the third heat exchanger is installed at an air inlet of the outdoor air duct.
4. The cooling unit of claim 3, further comprising an indoor supply air duct, an indoor return air duct, an outdoor supply air duct, an indoor fan, and an outdoor fan, wherein the indoor supply air duct communicates with the indoor supply air duct and the indoor return air duct, the outdoor air duct communicates with the outdoor supply air duct and the outdoor supply air duct, the first heat exchanger and the indoor fan are located in the indoor supply air duct, the second heat exchanger and the outdoor fan are located in the outdoor supply air duct, and the third heat exchanger is located in the outdoor supply air duct.
5. The cooling unit of claim 4, wherein the indirect evaporative heat exchange system further comprises a spray device having a spray line comprising a spray pump and a spray pipe connected in series, the spray pipe being located between the third heat exchanger and the outdoor air duct.
6. A control method of a cooling unit, characterized in that the cooling unit is the cooling unit according to any one of claims 3 to 5, the control method comprising:
and opening the second refrigerant driving part, the third valve body and the fourth valve body based on executing the first working mode, and closing the first valve body and the second valve body.
7. The control method according to claim 6, characterized in that the cooling unit is the cooling unit of claim 4; the control method further includes:
acquiring a dry bulb temperature To of outdoor air;
judging whether the first temperature judging condition To < To2 is met, wherein To2 is a second temperature threshold;
if the first temperature judging condition is judged to be met, generating an instruction for executing the first working mode; wherein the indoor fan and the outdoor fan are also turned on based on executing the first operation mode.
8. The control method according to claim 6, wherein the cooling unit is the cooling unit according to claim 4, the control method further comprising:
and on the basis of executing a second working mode, opening the indoor fan and the outdoor fan, and closing the first refrigerant driving part, the second refrigerant driving part, the first valve body, the second valve body, the third valve body and the fourth valve body.
9. The control method according to claim 8, characterized by further comprising:
acquiring a dry bulb temperature To of outdoor air;
judging whether the second temperature judgment condition To2 is less than or equal To To < To1, wherein To1 is a first temperature threshold value, and To2 is a second temperature threshold value;
if it is determined that the second temperature determination condition is satisfied, an instruction to execute the second operation mode is generated.
10. The control method according to claim 6, wherein the cooling unit is the cooling unit according to claim 5, the control method further comprising:
and on the basis of executing a third working mode, starting the spray pump, the indoor fan and the outdoor fan, and closing the first refrigerant driving part, the second refrigerant driving part, the first valve body, the second valve body, the third valve body and the fourth valve body.
11. The control method according to claim 10, characterized by further comprising:
acquiring a dry bulb temperature To and a wet bulb temperature To of outdoor air;
judging whether a third temperature judgment condition To is more than or equal To To1 and whether Tow < Tow1 is met, wherein To1 is a first temperature threshold and Tow1 is a third temperature threshold;
if it is determined that the third temperature determination condition is satisfied, an instruction to execute the third operation mode is generated.
12. The control method according to claim 6, wherein the cooling unit is the cooling unit according to claim 5, the control method further comprising:
and on the basis of executing a fourth working mode, starting the spray pump, the indoor fan, the outdoor fan, the first refrigerant driving component, the first valve body and the second valve body, and closing the second refrigerant driving component, the third valve body and the fourth valve body.
13. The control method according to claim 12, characterized by further comprising:
acquiring a wet bulb temperature Tow of outdoor air;
judging whether the fourth temperature judging condition Tow is more than or equal to Tow1 or not, wherein Tow1 is a third temperature threshold;
if it is determined that the fourth temperature determination condition is satisfied, an instruction to execute the fourth operation mode is generated.
CN202210863543.0A 2022-07-20 2022-07-20 Refrigerating system, cooling unit and control method of cooling unit Active CN115200269B (en)

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Publication number Priority date Publication date Assignee Title
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CN215529686U (en) * 2021-06-09 2022-01-14 苏州英维克温控技术有限公司 Cold water type cold station system
CN114517942A (en) * 2021-03-24 2022-05-20 广东美的暖通设备有限公司 Temperature adjustment device, air conditioning system, control method, and readable storage medium

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20160010805A (en) * 2014-07-18 2016-01-28 주식회사 성지테크 Free cooling system with absorption chiller
CN105430998A (en) * 2014-09-22 2016-03-23 广东申菱环境***股份有限公司 Control method of fluorine-pump internal-circulation server cabinet heat radiation system
CN105805904A (en) * 2014-12-31 2016-07-27 艾默生网络能源有限公司 Refrigeration control system and method for computer room
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