WO2016141790A1 - Système de réfrigération multiconnexion possédant une source froide naturelle, et son procédé de commande - Google Patents

Système de réfrigération multiconnexion possédant une source froide naturelle, et son procédé de commande Download PDF

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Publication number
WO2016141790A1
WO2016141790A1 PCT/CN2016/073228 CN2016073228W WO2016141790A1 WO 2016141790 A1 WO2016141790 A1 WO 2016141790A1 CN 2016073228 W CN2016073228 W CN 2016073228W WO 2016141790 A1 WO2016141790 A1 WO 2016141790A1
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WIPO (PCT)
Prior art keywords
outlet
outdoor
indoor
control valve
flow control
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PCT/CN2016/073228
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English (en)
Chinese (zh)
Inventor
黄志超
黄桂良
胡荣国
Original Assignee
深圳市艾特网能有限公司
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Publication of WO2016141790A1 publication Critical patent/WO2016141790A1/fr

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F5/00—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F3/00—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems
    • F24F3/06—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the arrangements for the supply of heat-exchange fluid for the subsequent treatment of primary air in the room units
    • F24F3/065—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the arrangements for the supply of heat-exchange fluid for the subsequent treatment of primary air in the room units with a plurality of evaporators or condensers
    • 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
    • F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
    • 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
    • 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
    • F24F11/89—Arrangement or mounting of control or safety devices
    • 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
    • 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
    • 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
    • F24F11/85—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 variable-flow pumps
    • 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

Definitions

  • the present invention relates to the field of refrigeration systems, and more particularly to a multiple refrigeration system with natural cooling and a method of controlling the same.
  • the current multi-cooling system with natural cooling especially in multi-unit refrigeration units such as computer rooms, data centers, etc., such as air-cooled chillers and water-cooled chillers, all use compressors as refrigeration power refrigeration.
  • the compressor refrigeration system In the case of low outdoor temperature, the compressor refrigeration system has low energy efficiency, which is easy to cause energy waste and cannot meet the national energy conservation and emission reduction requirements.
  • the current indoor unit has a large volume and a low energy efficiency ratio, which cannot satisfactorily meet the needs of users.
  • the technical problem to be solved by the present invention is to provide an improved multi-cold refrigeration system with natural cooling and a control method thereof against the defects of the prior art.
  • the technical solution adopted by the present invention to solve the technical problem thereof is: a multiple cooling system with natural cooling, comprising at least one indoor refrigeration unit, at least one outdoor refrigeration unit, and a connection between the indoor refrigeration unit and a cold conveying unit of the outdoor refrigeration unit;
  • the cold conveying unit includes a liquid storage device for storing the refrigerant and a transfer pump connected to the liquid storage device;
  • the outdoor refrigeration unit includes a partition wall heat exchange unit, and the partition wall heat exchange unit includes mutually independent first heat exchange tubes and second heat exchange tubes for performing heat exchange;
  • the cold conveying unit and the first heat exchange conduit form a closed loop;
  • the indoor refrigeration unit includes a first flow control valve connected to the delivery pump outlet, an indoor evaporator connected to the first flow control valve outlet and the first heat exchange conduit inlet, and a first a control unit, wherein the first control unit is connected to the first flow control valve and the transfer pump, respectively, for
  • the internal refrigeration demand controls the start and stop of the first flow control valve and the transfer pump, and controls the temperature of the first flow control valve according to the indoor outlet superheat of the indoor evaporator, according to the front and rear of the transfer pump
  • the differential pressure controls the capacity output of the transfer pump;
  • the outdoor refrigeration unit further includes a compressor connected to the second heat exchange pipe outlet, a condensing device connected to the compressor outlet, a refrigerant pump connected to the condensing device outlet, and the refrigeration a second flow control valve connected to the inlet of the second heat exchange conduit and a second control portion, the second control portion and the compressor, the second flow control valve, and the condensing device Connected to the refrigerant pump for controlling start-stop or capacity output of the compressor according to outdoor refrigeration demand, and controlling the condensing device according to a first outlet pressure and/or a first outlet temperature of the outlet of the condensing device a capacity output, controlling a temperature of the second flow control valve according to an outdoor outlet superheat of the second heat exchange conduit, and controlling a capacity output of the refrigerant pump according to a twist of the second flow control valve.
  • the at least one indoor refrigeration unit comprises at least two indoor refrigeration units arranged in parallel.
  • the method further comprises an indoor fan cooperating with the indoor evaporator, wherein the first control unit is connected to the indoor fan, and is configured to control the intensity or capacity output of the indoor fan according to the indoor cooling demand.
  • the outdoor refrigeration unit comprises at least two outdoor refrigeration units arranged in series, and the first heat exchange pipes of the at least two outdoor refrigeration units are connected; or
  • the outdoor refrigeration unit includes at least two outdoor refrigeration units arranged in parallel, the at least two outdoor refrigeration units sharing one of the partition wall heat exchange units and one of the second flow control valves, the at least two At least two compressors of the outdoor refrigeration unit are connected in parallel to the second heat exchange conduit outlet of the partition wall heat exchange unit, and at least two condensation devices are connected in parallel to the at least two compressor outlets and the second flow Control valve inlet; or
  • the outdoor refrigeration unit includes at least two outdoor refrigeration units arranged in parallel, and the first heat exchange conduit outlets of the at least two outdoor refrigeration units are respectively connected to the liquid storage device.
  • the condensing device includes an outdoor fan connected to the outdoor condenser connected between the compressor and the second flow control valve, and the outdoor fan, the second control unit and the The outdoor fan is connected to control the capacity output of the outdoor fan according to the first outlet pressure and/or the first outlet temperature of the outdoor condenser outlet; or
  • the condensing device includes an outdoor condenser connected between the compressor and the second flow control valve And a cooling water output device that cooperates with the outdoor condenser, the second control unit controls a capacity output of the cooling water output device.
  • the present invention also provides a control method for a multi-connected refrigeration system with natural cooling, comprising the following steps performed by the first control unit:
  • S11 obtaining indoor refrigeration demand, indoor outlet superheat of the indoor evaporator, and a pressure difference value before and after the pump;
  • S12 controlling start and stop of the first flow control valve and the transfer pump according to indoor refrigeration demand
  • S14 controlling the capacity output of the transfer pump according to a pressure difference before and after the transfer pump;
  • S21 determining an outdoor cooling demand, a first outlet pressure of the condensing device outlet and/or a first outlet temperature, an outdoor outlet superheat of the second heat exchange conduit, and a twist of the second flow control valve;
  • S22 controlling start/stop or capacity output of the compressor according to outdoor cooling demand
  • S23 controlling a capacity output of the condensing device according to a first outlet pressure and/or a first outlet temperature of the outlet of the condensing device;
  • the step S11 includes: collecting an indoor ambient temperature, comparing the indoor ambient temperature with a first preset temperature value, calculating a temperature difference between the two to determine the indoor cooling demand; Calculating a second outlet temperature of the evaporator outlet and/or a second outlet pressure to determine the indoor outlet superheat; collecting a pump inlet pressure and a pump outlet pressure of the delivery pump, and calculating a pressure difference before and after the pump is obtained value.
  • the step S12 includes: comparing the indoor cooling demand with a preset first cooling threshold, and if the indoor cooling demand is greater than or equal to the first cooling threshold, controlling the first The flow control valve and the delivery pump are activated, and if not, controlling the first flow control valve and the delivery pump to stop working;
  • the step S13 includes: comparing the indoor outlet superheat degree with a preset first superheat degree threshold range, and if the indoor outlet superheat degree is less than the first superheat degree threshold range, reducing the Determining the temperature of the first flow control valve; if the indoor outlet superheat is greater than the first superheat threshold range, increasing the twist of the first flow control valve; if the indoor outlet superheat is at Maintaining the temperature of the first flow control valve within the first superheat threshold range;
  • the step S14 includes: comparing the pressure difference value with a preset pressure difference threshold range, and if the pressure difference value is smaller than the pressure difference threshold range, reducing the capacity output of the delivery pump; And the pressure difference value is greater than the pressure difference threshold range, thereby increasing the capacity output of the delivery pump; if the pressure difference value is within the pressure difference threshold range, maintaining the capacity output of the delivery pump.
  • the step S21 includes: collecting a third outlet temperature, a third outlet pressure, a first inlet pressure or a first inlet temperature of the first heat exchange conduit outlet, and the third outlet temperature, the third Calculating the three outlet pressures, the first inlet pressure or the first inlet temperature and the second preset temperature value to obtain the outdoor refrigeration demand; collecting the fourth outlet temperature and/or the fourth outlet pressure of the second heat exchange conduit outlet Calculated to determine the outdoor outlet superheat.
  • the step S22 includes: comparing the outdoor cooling demand with a preset second cooling threshold, and if the outdoor cooling demand is greater than the second cooling threshold, controlling the starting the compression And adjusting the capacity output of the compressor, and if not, controlling the compressor to stop working;
  • the step S23 includes: converting the first outlet temperature into a corresponding outlet pressure value by calculation, and performing the corresponding outlet pressure value or the first outlet pressure with a preset pressure threshold range Comparing; if the corresponding outlet pressure value or the first outlet pressure is greater than the pressure threshold range, increasing a capacity output of the condensing device; if the corresponding outlet pressure value or the first outlet pressure Less than the pressure threshold range, reducing the capacity output of the condensing device; if the corresponding outlet pressure value or the first outlet pressure is within the pressure threshold range, maintaining the capacity of the condensing device Output
  • the step S24 includes: comparing the outdoor outlet superheat degree with a preset second superheat degree threshold range If the outdoor outlet superheat is less than the second superheat threshold range, reducing the twist of the second flow control valve; if the outdoor outlet superheat is greater than the second superheat threshold range, Increasing a twist of the second flow control valve; if the outdoor outlet superheat is within the second superheat threshold range, maintaining a twist of the second flow control valve;
  • the step S25 includes: comparing the twist of the second flow control valve with a preset threshold range
  • the mobility of the second flow control valve is less than the threshold threshold range, reducing the capacity output of the refrigerant pump; if the second flow control valve is greater than the temperature threshold range, increasing The capacity output of the refrigerant pump; if the temperature of the second flow control valve is within a threshold range, maintaining the capacity output of the refrigerant pump.
  • the multi-cooling system with natural cooling uses a compressor and a refrigerant pump as the cooling power, which can effectively improve the cooling energy efficiency and avoid energy waste; Moreover, by using the partition wall heat exchange unit to exchange heat between the indoor refrigeration unit and the outdoor refrigeration unit, the heat exchange efficiency is high, the heat loss is small, the structure is compact and light, and the floor space is small; in addition, the natural cold multi-connected refrigeration system
  • the indoor refrigeration unit includes only the indoor evaporator and the first flow control valve and the first control portion, and has a small volume.
  • Embodiment 1 is a schematic structural view of a multiple refrigeration system with natural cooling in Embodiment 1 of the present invention.
  • Embodiment 2 is another schematic structural view of a multiple refrigeration system with natural cooling in Embodiment 1 of the present invention.
  • Embodiment 3 is another schematic structural view of a multiple refrigeration system with natural cooling in Embodiment 1 of the present invention.
  • Embodiment 4 is another schematic structural view of a multiple refrigeration system with natural cooling in Embodiment 1 of the present invention.
  • FIG. 5 is a flow chart showing a control method of a multi-cooling system with natural cooling in Embodiment 2 of the present invention.
  • step S12 of FIG. 5 is a flow chart of step S12 of FIG. 5.
  • step S13 of FIG. 5 is a flow chart of step S13 of FIG. 5.
  • step S14 of FIG. 5 is a flow chart of step S14 of FIG. 5.
  • step S22 of FIG. 5 is a flow chart of step S22 of FIG. 5.
  • step S23 of FIG. 5 is a flow chart of step S23 of FIG. 5.
  • step S24 of FIG. 5 is a flow chart of step S24 of FIG. 5.
  • step S25 of FIG. 5 is a flow chart of step S25 of FIG. 5.
  • FIGS. 1 to 4 illustrate a multi-cooling system with natural cooling in the present embodiment, the natural cooling multi-connected refrigeration system including at least one indoor refrigeration unit 10, at least one outdoor refrigeration unit 20, and The cold conveying unit 30 that connects the indoor refrigeration unit 10 and the outdoor refrigeration unit 20 is connected.
  • at least one of the indoor refrigeration units 10 includes at least two indoor refrigeration units 10 arranged in parallel. It can be understood that at least two indoor refrigeration units 10 are arranged in parallel such that the indoor refrigeration units 10 do not affect each other; the number of each indoor refrigeration unit 10 is determined according to user requirements, and the number of outdoor refrigeration units 20 depends on the indoor refrigeration unit. 10 required cooling requirements are determined.
  • the cooling amount conveying unit 30 includes a liquid storage device 31 for storing the refrigerant and a transfer pump 32 connected to the liquid storage device 31.
  • the refrigerant may be a liquid phase change refrigerant such as Freon which absorbs heat (i.e., refrigeration capacity) into the chamber during evaporation in a low temperature state.
  • the phase change refrigerant utilizes the principle of liquid evaporation heat absorption, and the heat exchange efficiency is higher than that of the air cooling or water cooling unit using the cooling water for cold volume transportation, and the required refrigerant circulation amount is low. , no need for higher power delivery pump 3 2.
  • the experiment proves that the phase change refrigerant is used to transport the cooling capacity. For every kilogram of the unit with a cooling capacity of 214 kJ and 100 kW, the circulation of the refrigerant only needs to reach 1.687 ton / ⁇ , and the power of the pump 32 is only needed. l.lkW.
  • the outdoor refrigeration unit 20 includes a partition wall heat exchange unit 21, and the partition wall heat exchange unit 21 includes mutually independent first heat exchange tubes 211 and second exchanges for performing heat exchange. Heat pipe 212.
  • the partition wall heat exchange unit 21 can be a plate heat exchange unit, and the plate heat exchange unit is an important device for heat exchange between liquid-liquid and liquid-vapor, and has high heat exchange efficiency, small heat loss, compact structure and light weight.
  • the utility model has the advantages of small occupied area, convenient installation and cleaning, wide application and long service life.
  • the indoor refrigeration unit 10 As shown in FIGS. 1 to 4, the indoor refrigeration unit 10, the cold delivery unit 30, and the first heat exchange conduit 211 form a closed cycle.
  • the indoor refrigeration unit 10 includes a first flow control valve 11 connected to the outlet of the transfer pump 32, an indoor evaporator 12 connected to the outlet of the first flow control valve 11 and the inlet of the first heat exchange conduit 211, and a first control unit. 13.
  • the first control unit 13 is connected to the first flow control valve 11 and the transfer pump 32, respectively, for controlling the start and stop of the first flow control valve 11 and the transfer pump 32 according to the indoor refrigeration demand, according to the indoor outlet of the indoor evaporator 12
  • the heat controls the temperature of the first flow control valve 11, and controls the capacity output of the transfer pump 32 based on the differential pressure before and after the transfer pump 32.
  • the liquid phase change refrigerant stored in the liquid storage device 31 is transported to the indoor evaporator 12 by the transfer pump 32, and is converted into a vapor phase by the evaporation of the heat in the indoor evaporator 12.
  • the refrigerant is changed to provide a cooling capacity that meets the user's demand; the vapor phase change refrigerant flows through the first heat exchange conduit 211 of the partition heat exchange unit 21, and passes through the first heat exchange conduit 211 and the second heat exchange conduit 212.
  • Heat exchange is performed to convert the vapor phase change refrigerant into a liquid phase change refrigerant and deliver it to the liquid storage device 31.
  • the indoor refrigeration unit 10 further includes an indoor fan 14 that cooperates with the indoor evaporator 12, and the first control unit 13 is connected to the indoor fan 14 for controlling the indoor fan 14 according to the indoor refrigeration demand.
  • the strength or capacity output It is understood that the indoor fan 14 cooperating with the indoor evaporator 12 is used to increase the evaporation efficiency of the indoor evaporator 12, thereby improving the heat exchange efficiency of the indoor refrigeration unit 10.
  • the indoor refrigeration unit 10 further includes a first shutoff valve 15 disposed at the inlet of the first flow control valve 11 and a second shutoff valve 16 at the outlet of the indoor evaporator 12 (as shown in FIGS. 1-4).
  • a first shutoff valve 15 disposed at the inlet of the first flow control valve 11
  • a second shutoff valve 16 at the outlet of the indoor evaporator 12 (as shown in FIGS. 1-4).
  • the outdoor refrigeration unit 20 further includes a compressor 22 connected to the outlet of the second heat exchange conduit 212, a condensing device 23 connected to the outlet of the compressor 22, a refrigerant pump 26 connected to the outlet of the condensing device 23, and a refrigerant pump.
  • a second flow control valve 24 connected to the inlet of the second heat exchange conduit 212 and a second control portion 25, the second control portion 25 being respectively associated with the compressor 22, the second flow control valve 24, the condensing device 23, and the refrigerant pump 26 connected, for controlling the start-stop or capacity output of the compressor 22 according to the outdoor cooling demand, controlling the capacity output of the condensing device 23 according to the first outlet pressure of the outlet of the condensing device 23 and/or the first outlet temperature, according to the second heat exchange
  • the outdoor outlet superheat of the duct 212 controls the temperature of the second flow control valve 24, and controls the capacity output of the refrigerant pump 26 in accordance with the temperature of the second flow control valve 24.
  • the outdoor refrigeration unit 20 uses the compressor 22 and the refrigerant pump 26 as the cooling power, which can effectively improve the cooling energy efficiency and avoid energy waste, especially when the outdoor temperature is low, the refrigeration efficiency of the compressor 22 is low.
  • the vaporous refrigerant placed in the circulation pipe of the outdoor refrigeration unit 20 is exothermic under the condensation of the compressor 22 and the condensing device 23 and converted into a liquid refrigerant, and the liquid refrigerant is in the partition heat exchange unit 21.
  • the second heat exchange tube 212 absorbs heat to perform liquid to vapor phase conversion, and outputs vapor refrigerant to the compressor 22 and the condensing unit 23.
  • the first heat exchange conduit 211 and the second heat exchange conduit 21 of the partition wall heat exchange unit 21 respectively perform vapor-liquid conversion and liquid-vapor conversion, and the heat exchange efficiency is high and the heat loss is small.
  • the first control unit 13 is communicably connected to the second control unit 25, and the second control unit 25 controls the activation of the second control unit 25 based on the indoor cooling demand transmitted by the first control unit 13. Stopping, that is, the first control unit 13 actually detects the indoor cooling demand to control the start and stop of the first flow control valve 11 and the transfer pump 32. If the first flow control valve 11 and the transfer pump 32 start and stop, the second control is correspondingly controlled.
  • the control unit 25 is activated to detect the outdoor cooling demand, the first outlet pressure of the outlet of the condensing device 23 and/or the first outlet temperature, and the outdoor outlet superheat of the second heat exchange conduit 212 to control the respective compressors 22, condensing Device 23 and second flow control valve 24
  • the condensing device 23 disposed outdoors can adopt an air-cooling unit (as shown in FIG. 1 to FIG. 3).
  • the condensing device 23 includes an outdoor fan 232 coupled to the outdoor condenser 231 connected between the compressor 22 and the second flow control valve 24, and the second control unit 25 is connected to the outdoor fan 232 for The first outlet pressure at the outlet of the outdoor condenser 231 and/or the first outlet temperature controls the capacity output of the outdoor fan 232.
  • the condensing device 23 placed outdoors can also adopt a water cooling unit (as shown in FIG. 4), which The condensing device 23 includes an outdoor condenser 231 connected between the compressor 22 and the second flow rate control valve 24, and a cooling water output device 233 coupled to the outdoor condenser 231, and the second control unit 25 controls the cooling water output device 233. Capacity output.
  • the outdoor refrigeration unit 20 may include at least two outdoor refrigeration units 20 arranged in series, and the first heat exchange tubes 211 of at least two outdoor refrigeration units 20 are connected to flow through at least two second
  • the phase change refrigerant of the heat exchange conduit 212 is subjected to multi-stage condensation to make it more condensing efficiency, thereby improving the heat exchange efficiency of the multi-cold refrigeration system with natural cooling.
  • the outdoor refrigeration unit 20 may include at least two outdoor refrigeration units 20 arranged in parallel, and at least two outdoor refrigeration units 20 share a wall heat exchange unit 21 and a second flow control valve 24, At least two compressors 22 of at least two outdoor refrigeration units 20 are connected in parallel to the second heat exchange conduit 2 12 outlet of the heat exchange unit, and at least two condensing devices 23 are connected in parallel to at least two compressor 22 outlets and a second flow Control valve 24 inlet. At least two outdoor refrigerating units 20 are respectively arranged in parallel by the compressor 22 and the condensing device 23 as shown in FIG. 2, which can effectively accelerate the condensation efficiency of the outdoor refrigerating unit 20, thereby accelerating the evaporation efficiency in the second heat exchange conduit 212. , improving heat exchange efficiency of the second heat exchange pipe 212 and the first heat exchange pipe 211
  • the outdoor refrigeration unit 20 includes at least two outdoor refrigeration units 20 arranged in parallel, and the outlets of the first heat exchange tubes 211 of the at least two outdoor refrigeration units 20 are connected to the respective liquid storage devices 31. It can be understood that at least two outdoor refrigeration units 20 adopt a connection manner as shown in FIG. 3, so that each outdoor refrigeration unit 20 exchanges heat with at least two outdoor refrigeration units 20 without affecting each other, and ensures each outdoor refrigeration unit. 20 heat exchange efficiency with at least two indoor refrigeration units 10.
  • FIG. 5 shows a control method of the multi-cooling system with natural cooling in the present embodiment, the control method including the following steps performed by the first control unit 13:
  • the first control unit 13 actually obtains the indoor cooling demand CFrl, the indoor outlet superheat degree SHrl of the indoor evaporator 12, and the differential pressure ⁇ before and after the transfer pump 32.
  • the step S11 includes: acquiring the indoor cooling demand C Frl by collecting the indoor ambient temperature T1, comparing the indoor ambient temperature T1 with the first preset temperature value Ts etl, and calculating the temperature difference between the two as the indoor cooling demand CFrl .
  • the indoor outlet superheat SHrl of the indoor evaporator 12 is determined by collecting the second outlet temperature T2 and/or the second of the outlet of the indoor evaporator 12
  • the outlet pressure P1 is calculated according to the superheat degree calculation formula to determine the indoor outlet superheat degree SHrl of the indoor evaporator 12. Specifically, by collecting the second outlet temperature T2 at two points of the outlet of the indoor evaporator 12, or the second outlet pressure P1 of two points, or collecting the second outlet temperature ⁇ 2 and the second outlet pressure PI at any point, The indoor outlet superheat degree SHrl of the indoor evaporator 12 is calculated.
  • the determination of the pressure difference ⁇ P before and after the delivery pump 32 is performed by collecting the pump inlet pressure P2 and the pump outlet pressure P3 of the delivery pump 32, and calculating the pressure difference ⁇ before and after the delivery pump 32 is obtained.
  • step S12 The first control unit 13 controls the start and stop of the first flow control valve 11 and the transfer pump 32 according to the indoor cooling demand CFrl. As shown in FIG. 6, step S12 includes the following steps: First control unit 13 compares indoor cooling demand CFrl with preset first cooling threshold CFsetl, and if indoor cooling demand CFrl is greater than or equal to first cooling threshold CFset1, then control A flow control valve 11 and a transfer pump 32 are activated, and if not, the first flow control valve 11 and the transfer pump 32 are controlled to stop operating.
  • step S13 The first control unit 13 controls the temperature Xrl of the first flow rate control valve 11 according to the indoor outlet superheat degree SHrl of the indoor evaporator 12. As shown in FIG. 7, step S13 includes the following steps: The first control unit 13 compares the indoor outlet superheat degree SHrl with a preset first superheat degree threshold range SHsetl, if the indoor outlet superheat degree SHrl is smaller than the first superheat degree threshold range SHsetl Then, the twist Xrl of the first flow control valve 11 is reduced. If the indoor outlet superheat degree SHrl is greater than the first superheat degree threshold range SHset1, the twist Xrl of the first flow control valve 11 is increased. If the indoor outlet superheat degree SHrl is within the first superheat threshold range SHset1, the twist Xrl of the first flow control valve 11 is maintained.
  • step S14 The first control unit 13 controls the capacity output of the transfer pump 32 based on the differential pressure ⁇ before and after the transfer pump 32.
  • step S14 includes: the first control unit 13 compares the differential pressure difference ⁇ with a preset differential pressure threshold range Pset, and reduces the capacity of the transfer pump 32 if the differential pressure difference ⁇ is smaller than the differential pressure threshold range Pset. Output. If the differential pressure ⁇ is greater than the differential pressure threshold range Pset, the capacity output of the transfer pump 32 is increased; if the differential pressure ⁇ is within the differential pressure threshold range Pset, the capacity output of the transfer pump 32 is maintained.
  • the first control unit 13 does not affect the mutual control of the transfer pump 32 and the first flow control valve 11, that is, there is no order between the two, and the control is independently controlled according to the respective control conditions. Specifically, the first control unit 13 controls the transfer pump 32 and the first flow control valve 11 by using a PID control method or a P control method.
  • the control method of the naturally cooled multi-connected refrigeration system further includes the following steps performed by the second control unit 25: [0083] S21: determining the outdoor cooling demand CFr2, the first outlet pressure P4 of the outlet of the condensing device 23, and/or Or the first outlet temperature T3, and the outdoor outlet superheat degree SHr2 of the second heat exchange conduit 212 and the twist Xr2 of the second flow control valve 24.
  • the step S21 includes: the outdoor cooling demand CFr2 collects the third outlet temperature T4, the third outlet pressure ⁇ 5, the first inlet pressure ⁇ 6 or the first inlet temperature ⁇ 5 of the outlet of the first heat exchange conduit 211, and The three outlet temperature ⁇ 4, the third outlet pressure ⁇ 5, the first inlet pressure ⁇ 6 or the first inlet temperature ⁇ 6 are calculated with the second preset temperature value Tset2 to obtain the outdoor cooling demand CFr2.
  • the first outlet pressure P4 and/or the first outlet temperature T3 at the outlet of the condensing unit 23 are collected.
  • the determination of the outdoor outlet superheat degree SHr2 of the second heat exchange conduit 212 is performed by collecting the fourth outlet temperature T6 and/or the fourth outlet pressure P7 of the outlet of the first heat exchange conduit 211, and calculating according to the superheat degree calculation formula to determine the second change The outdoor outlet superheat degree SHr2 of the heat pipe 212. Specifically, the fourth outlet temperature T6 at two points of the second heat exchange conduit 212 exit, or the fourth outlet pressure ⁇ 6 at two points, or the fourth outlet temperature ⁇ 6 and the fourth outlet pressure ⁇ 7 at any point are collected, The outdoor outlet superheat SHr2 can be calculated.
  • step S22 The second control unit 25 controls the start-stop or capacity output of the compressor 22 according to the outdoor cooling demand CFr2. As shown in FIG. 9, step S22 includes the following steps: comparing the outdoor cooling demand CFr2 with a preset second cooling threshold C Fset2, and if the outdoor cooling demand CFr2 is greater than the second cooling threshold CFset2, controlling the starting of the compressor 2 2 and adjusting The capacity output of the compressor 22, if not, controls the compressor 22 to stop operating.
  • step S23 The second control unit 25 controls the capacity output of the condensing device 23 according to the first outlet pressure P4 and/or the first outlet temperature T3 of the outlet of the condensing device 23.
  • step S23 includes the following steps: The second control unit 25 converts the first outlet temperature T3 into a corresponding outlet pressure value by calculation, and the corresponding outlet pressure value or the first outlet pressure P4 is preset. The pressure threshold range Psetl is compared. If the corresponding outlet pressure value or first outlet pressure P4 is greater than the pressure threshold range, the capacity output of the condensing device 23 is increased.
  • the capacity output of the condensing device 23 is reduced. If the corresponding outlet pressure value or first outlet pressure P4 is within the pressure threshold range Pset1, the capacity output of the condensing device 23 is maintained.
  • the condensing device 23 adopts an air cooling unit, that is, the condensing device 23 includes an outdoor fan 232 that is coupled between the compressor 22 and the second flow control valve 24 and the outdoor condenser 231. Then, the second control unit 25 can control the capacity output of the outdoor fan 232 according to the first outlet pressure P4 and/or the first outlet temperature T3 of the outlet of the outdoor condenser 231, that is, control the rotational speed of the outdoor fan 232.
  • the condensing unit 23 includes an outdoor condenser 231 connected between the compressor 22 and the second flow control valve 24, and a cooling water output device 233 coupled to the outdoor condenser 231,
  • the second control unit 25 can control the capacity output of the control cooling water output device 233 according to the first outlet pressure P4 and/or the first outlet temperature T3 of the outlet of the outdoor condenser 231.
  • step S24 controlling the temperature Xr2 of the second flow control valve 24 according to the outdoor outlet superheat degree SHr2 of the second heat exchange conduit 212.
  • step S24 includes the following steps: The second control unit 25 compares the outdoor outlet superheat degree S Hr2 with a preset second superheat degree threshold range SHset2, if the outdoor outlet superheat degree SHr2 is smaller than the second superheat degree threshold range SHset2, then reduces the twist Xr2 of the second flow control valve 24. If the outdoor outlet superheat SHr2 is greater than the second superheat threshold range SHset2, the twist Xr2 of the second flow control valve 24 is increased. If the outdoor outlet superheat degree SHr2 is within the second superheat degree threshold range SHset2, the twist Xr2 of the second flow control valve 24 is maintained.
  • step S25 The second control unit 25 controls the capacity output of the refrigerant pump 26 in accordance with the temperature Xr2 of the second flow rate control valve 24.
  • step S25 includes the following steps: Comparing the twist Xr2 of the second flow control valve 24 with a preset threshold threshold range Xset1, if the twist Xr2 of the second flow control valve 24 is less than the threshold threshold range Xsetl, the capacity output of the refrigerant pump 26 is reduced; if the temperature Xr2 of the second flow control valve 24 is greater than the threshold threshold range Xset1, the capacity output of the refrigerant pump 26 is increased; if the second flow control valve 24 is The temperature Xr2 is within the threshold threshold range Xset1, and the capacity output of the refrigerant pump 26 is maintained.
  • the second control unit 25 does not affect the control of the second flow control valve 24, the condensing device 23, and the compressor 22, that is, there is no order between the two, and is independently controlled according to respective control conditions. specifically The second control unit 25 controls the second flow rate control valve 24, the condensing unit 23, and the compressor 22 by a PID control method or a P control method.
  • the first control unit 13 obtains the indoor cooling demand CFrl, the indoor outlet superheat degree SHrl, and the differential pressure ⁇ before and after the transfer pump 32, and
  • the first flow control valve 11 and the transfer pump 32 are independently controlled;
  • the second control unit 25 actually obtains the outdoor cooling demand CFr2, the first outlet pressure P4 of the outlet of the condensing device 23, and/or the first outlet temperature T3, and the outdoor outlet superheat SH R2 and the second flow control valve 24 have a temperature Xr2, and independently control the temperature of the compressor 22, the condensing device 23, the second flow control valve 24, and the compressor 26.
  • the control method employs a compressor in the outdoor refrigeration unit 20 As the refrigeration power, the refrigerant pump can effectively improve the cooling energy efficiency, and the control method is simple and easy to implement, and the corresponding components of the multi-cooling system with natural cooling are independently controlled to avoid energy waste caused by the associated control of multiple components.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Atmospheric Sciences (AREA)
  • Sustainable Development (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Air Conditioning Control Device (AREA)

Abstract

L'invention concerne un système de réfrigération multiconnexion possédant une source froide naturelle, et son procédé de commande. Le système comprend au moins une unité de réfrigération intérieure (10), au moins une unité de réfrigération extérieure (20), et une unité de transfert d'énergie froide (30) reliant l'unité de réfrigération intérieure (10) à l'unité de réfrigération extérieure (20). L'unité de transfert d'énergie froide (30) comprend un dispositif de stockage de liquide (31) destiné au stockage de réfrigérant, et une pompe de transport (32) reliée au dispositif de stockage de liquide (31). L'unité de réfrigération extérieure (20) comprend une unité d'échange thermique à récupération (21) comprenant un premier tuyau d'échange thermique (211) et un second tuyau d'échange thermique (212) indépendants l'un de l'autre et utilisés pour échanger de la chaleur. L'unité de réfrigération extérieure (20) comprend en outre un compresseur (22), un dispositif de condensation (23), une pompe à réfrigérant (26) et une seconde partie de commande (25). L'unité de réfrigération intérieure (10) comprend une première soupape de régulation de débit (11), un évaporateur intérieur (12) et une première partie de commande (13). L'unité de réfrigération intérieure (10), l'unité de transfert d'énergie froide (30) et le premier tuyau d'échange thermique (211) forment un cycle fermé.
PCT/CN2016/073228 2015-03-10 2016-02-02 Système de réfrigération multiconnexion possédant une source froide naturelle, et son procédé de commande WO2016141790A1 (fr)

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Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104776524B (zh) * 2015-03-10 2018-07-06 深圳市艾特网能有限公司 带自然冷的多联制冷系统及其控制方法
CN106482404B (zh) * 2016-09-09 2019-05-14 郑州云海信息技术有限公司 一种空调系统及其控制方法
CN106705298B (zh) * 2016-12-23 2022-07-01 南通华信中央空调有限公司 一种带排风热泵热回收的多联式新风空调机组及换热方法
CN108548352B (zh) * 2018-04-20 2021-06-01 依米康科技集团股份有限公司 一种机房空调系统的控制方法

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0921574A (ja) * 1995-07-04 1997-01-21 Hitachi Ltd 多室空気調和機
JPH10306952A (ja) * 1997-05-08 1998-11-17 Daikin Ind Ltd ２次冷媒システム式冷凍装置
CN102538100A (zh) * 2012-02-17 2012-07-04 合肥工业大学 机房用热管复合型空调机组及其控制方法
CN102607120A (zh) * 2012-03-27 2012-07-25 北京工业大学 一种复叠机械制冷的液泵驱动热管装置及运行方法
CN104121625A (zh) * 2013-04-23 2014-10-29 艾默生网络能源有限公司 一种节能空调及其控制方法
CN104266314A (zh) * 2014-10-16 2015-01-07 中国扬子集团滁州扬子空调器有限公司 一种复合式制冷多联空调系统的控制方法
CN104776524A (zh) * 2015-03-10 2015-07-15 深圳市艾特网能有限公司 带自然冷的多联制冷系统及其控制方法
CN204574320U (zh) * 2015-03-10 2015-08-19 深圳市艾特网能有限公司 带自然冷的多联制冷系统

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002156166A (ja) * 2000-11-20 2002-05-31 Fujitsu General Ltd 多室形空気調和機
CN101338950B (zh) * 2008-08-18 2010-06-09 南京天加空调设备有限公司 大制热量多联式空调热泵机组
CN101694311B (zh) * 2009-10-23 2011-11-30 清华大学 一种带自然冷却功能的液泵供液多联式空调机组
CN202221254U (zh) * 2011-05-23 2012-05-16 昆明理工大学 一种车间中低温水蒸气余热梯级回收装置
CN102679482B (zh) * 2012-05-25 2014-09-17 宁波奥克斯空调有限公司 基于变频空调的热回收多联系统及其控制方法

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0921574A (ja) * 1995-07-04 1997-01-21 Hitachi Ltd 多室空気調和機
JPH10306952A (ja) * 1997-05-08 1998-11-17 Daikin Ind Ltd ２次冷媒システム式冷凍装置
CN102538100A (zh) * 2012-02-17 2012-07-04 合肥工业大学 机房用热管复合型空调机组及其控制方法
CN102607120A (zh) * 2012-03-27 2012-07-25 北京工业大学 一种复叠机械制冷的液泵驱动热管装置及运行方法
CN104121625A (zh) * 2013-04-23 2014-10-29 艾默生网络能源有限公司 一种节能空调及其控制方法
CN104266314A (zh) * 2014-10-16 2015-01-07 中国扬子集团滁州扬子空调器有限公司 一种复合式制冷多联空调系统的控制方法
CN104776524A (zh) * 2015-03-10 2015-07-15 深圳市艾特网能有限公司 带自然冷的多联制冷系统及其控制方法
CN204574320U (zh) * 2015-03-10 2015-08-19 深圳市艾特网能有限公司 带自然冷的多联制冷系统

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