CN104296414A - Multi-compressor air conditioning system capable of performing single module independent defrosting - Google Patents

Multi-compressor air conditioning system capable of performing single module independent defrosting Download PDF

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Publication number
CN104296414A
CN104296414A CN201410557615.4A CN201410557615A CN104296414A CN 104296414 A CN104296414 A CN 104296414A CN 201410557615 A CN201410557615 A CN 201410557615A CN 104296414 A CN104296414 A CN 104296414A
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CN
China
Prior art keywords
valve
compressor
electric expansion
subcooler
cold
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Granted
Application number
CN201410557615.4A
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Chinese (zh)
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CN104296414B (en
Inventor
唐圣
胡永
柴国红
李艳
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Trane Air Conditioning Systems China Co Ltd
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Trane Air Conditioning Systems China Co Ltd
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Priority to CN201410557615.4A priority Critical patent/CN104296414B/en
Priority claimed from CN201410557615.4A external-priority patent/CN104296414B/en
Publication of CN104296414A publication Critical patent/CN104296414A/en
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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B13/00Compression machines, plants or systems, with reversible cycle
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B41/00Fluid-circulation arrangements
    • F25B41/20Disposition of valves, e.g. of on-off valves or flow control valves
    • F25B41/26Disposition of valves, e.g. of on-off valves or flow control valves of fluid flow reversing valves
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B41/00Fluid-circulation arrangements
    • F25B41/30Expansion means; Dispositions thereof
    • F25B41/31Expansion valves
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B47/00Arrangements for preventing or removing deposits or corrosion, not provided for in another subclass
    • F25B47/02Defrosting cycles
    • F25B47/022Defrosting cycles hot gas defrosting
    • F25B47/025Defrosting cycles hot gas defrosting by reversing the cycle
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2313/00Compression machines, plants or systems with reversible cycle not otherwise provided for
    • F25B2313/025Compression machines, plants or systems with reversible cycle not otherwise provided for using multiple outdoor units
    • F25B2313/0253Compression machines, plants or systems with reversible cycle not otherwise provided for using multiple outdoor units in parallel arrangements
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02BCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00Energy efficient heating, ventilation or air conditioning [HVAC]
    • Y02B30/70Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating

Abstract

The invention relates to a multi-compressor air conditioning system capable of performing single module independent defrosting. The system comprises a plurality of single modules which are parallelly disposed. Each single module comprises a compressor, a oil separator, a four-way valve, a condenser, a subcooler, and an air-liquid separator. The multi-compressor air conditioning system has the advantages that one outdoor unit can be independently converted into refrigerating and defrosting while other outdoor units continue heating, and huge influence on the heating effect of indoor units is avoided; when only one outdoor unit operates, when the outdoor unit is frosted, other outdoor units can be started to perform heating, the outdoor unit can independently perform defrosting under a refrigerating state, and indoor temperature fluctuation is avoided; during heating, when one of the outdoor units fails, the compressor cannot operate, and backup operation after failure can be achieved; by a sub-cooling loop combined with the system, heat can be released through outdoor unit condensers to lower system pressure when heating pressure rises abnormally.

Description

The multiple on-line system that a kind of energy single module independently defrosts
Technical field
the present invention relates to the multiple on-line system that a kind of energy single module independently defrosts.
Background technology
inside the multiple on-line system of an outer machine multimode combination: when all outer machines run, due to the difference of outer machine placement location or the difference of wind field distribution, certain outer machine can be there is and be easy to frosting, and other outer machine not easily frostings, traditional control is, if after a certain outer machine frosting, this intrasystem all outer machine all can and then change into refrigeration defrost.In addition: when heating, when the compressor of certain outer machine has been broken and cannot normally have been run, can only emergency operation at short notice, when needs oil return/defrosting etc. will switch cross valve, because compressor cannot operate, so can not as other running together normal switching cross valve, cause the system failure.
Summary of the invention
the object of this invention is to provide the multiple on-line system that a kind of energy single module independently defrosts.
for achieving the above object, the technical solution used in the present invention is:
the multiple on-line system that a kind of energy single module independently defrosts, comprise the multiple described single modules be arranged in parallel, each described single module comprises: compressor, oil eliminator, cross valve, condenser, subcooler, gas-liquid separator, the first electric expansion valve, the second electric expansion valve and electronic two-way valve
described compressor is connected to described oil eliminator, described oil eliminator is connected to described cross valve first port, described cross valve second port is connected to described condenser, described condenser is connected to the first electric expansion valve, the first described electric expansion valve is connected to described subcooler, and described subcooler is connected to interior machine; Described cross valve the 3rd port is connected to described gas-liquid separator, and described gas-liquid separator is connected to described compressor; Described cross valve the 4th port is connected to described electronic two-way valve, and described electronic two-way valve is connected to interior machine; Subcooler described in the second described electric expansion valve connects formed cold loop, described crosses in cold loop: the second described electric expansion valve is connected between described condenser and the first electric expansion valve, and described subcooler is connected to described cross valve the 4th port and electronic two-way valve.
preferably, described single module also comprises the first magnetic valve and check valve, is in parallel after the series connection of the first described magnetic valve, check valve with described electronic two-way valve.
preferably, when described system be in heat normally run time: cold-producing medium is from described compressor, oil eliminator, cross valve, electronic two-way valve to flowing to interior machine; Cold-producing medium from machine in described through subcooler, the first electric expansion valve, condenser, cross valve, gas-liquid separator to compressor.
preferably, during the defrosting of the outer machine of the single module in described system described in: the cold-producing medium of this outer machine defrosting single module is from described compressor, oil eliminator, cross valve, condenser, the second electric expansion valve, subcooler, cross valve, gas-liquid separator to compressor; Cold-producing medium from interior machine through subcooler, the first electric expansion valve, the second electric expansion valve, subcooler, cross valve, gas-liquid separator to compressor;
the cold-producing medium of the single module described in all the other is from described compressor, oil eliminator, cross valve, electronic two-way valve to flowing to interior machine; Cold-producing medium from machine in described through subcooler, the first electric expansion valve, condenser, cross valve, gas-liquid separator to compressor.
preferably, when described system heats pressure anomaly rising: cold-producing medium is from described compressor, oil eliminator, cross valve, electronic two-way valve to flowing to interior machine; Cold-producing medium from machine in described through subcooler, the first electric expansion valve, a part through condenser, cross valve, gas-liquid separator to compressor, another part through the second electric expansion valve, subcooler, electronic two-way valve to flowing to interior machine.
preferably, when described system be in refrigeration normally run time: cold-producing medium is from described compressor, oil eliminator, cross valve, condenser, the first electric expansion valve, subcooler to flowing to interior machine; Cold-producing medium from machine in described through electronic two-way valve, cross valve, gas-liquid separator 6 to compressor 1.
preferably, when described system be in freezed cold operation time: cold-producing medium from described compressor, oil eliminator, cross valve, condenser, a part through the first described electric expansion valve, subcooler to flowing to interior machine, another part through the second described electric expansion valve, subcooler, cross valve, gas-liquid separator to compressor; Cold-producing medium from machine in described through electronic two-way valve, cross valve, gas-liquid separator to compressor.
preferably, described electronic two-way valve is replaced by the second magnetic valve.
because technique scheme is used, the present invention compared with prior art has following advantages and effect:
the present invention realizes this outer machine and changes into separately refrigeration defrost, and the heating effect that other outer machines continue to heat running and are unlikely to internal machine produces a very large impact; When only having an outer machine running, after this outer machine frosting, the outer machine that can start other carries out heating running, and this outer machine independently can carry out refrigerating state defrosting, and can not cause fluctuations in indoor temperature; When heating, when certain outer machine breaks down, compressor cannot run, and can realize fault standby running; When the cold loop excessively that this system combines can realize heating pressure anomaly rising, carry out release heat by outdoor condenser and reduce system pressure.
Accompanying drawing explanation
accompanying drawing 1 is structural representation of the present invention;
refrigerant flow direction figure when accompanying drawing 2 is heating condition of the present invention;
accompanying drawing 3 is the refrigerant flow direction figure of a certain outer machine defrosting of the present invention in time being in heating condition;
accompanying drawing 4 for the present invention heat high-pressure too high time refrigerant flow direction figure;
accompanying drawing 5 be cooling condition of the present invention and opened cold time refrigerant flow direction figure.
wherein: 1, compressor; 2, oil eliminator; 3, cross valve; 4, condenser; 5, subcooler; 6, gas-liquid separator; 7, the first electric expansion valve; 8, the second electric expansion valve; 9, electronic two-way valve; 10, the first magnetic valve; 11, check valve; 12, stop valve.A, high-pressure side refrigerant flow direction; B, low side refrigerant flow to.
Detailed description of the invention
below in conjunction with accompanying drawing and case study on implementation, the invention will be further described:
the multiple on-line system that a kind of energy single module as shown in Figure 1 independently defrosts, comprise the multiple single modules be arranged in parallel, each single module comprises: compressor 1, oil eliminator 2, cross valve 3, condenser 4, subcooler 5, gas-liquid separator 6, first electric expansion valve 7, second electric expansion valve 8 and electronic two-way valve 9.Wherein: the second electric expansion valve 8 can adopt if deceleration type double fluid is to electric expansion valve etc., and electronic two-way valve 9 can adopt the second magnetic valve to replace.
the annexation of all parts is as follows: compressor 1 is connected to oil eliminator 2, oil eliminator 2 is connected to cross valve 3 first port 30, cross valve 3 second port 31 is connected to condenser 4, condenser 4 is connected to the first electric expansion valve 7, first electric expansion valve 7 is connected to subcooler 5, and subcooler 5 is connected to interior machine;
cross valve 3 the 3rd port 32 is connected to gas-liquid separator 6, and gas-liquid separator 6 is connected to compressor 1; Cross valve 3 the 4th port 33 is connected to electronic two-way valve 9, and electronic two-way valve 9 is connected to interior machine;
second electric expansion valve 8 connects subcooler 5 and formed cold loop, crosses in cold loop: the second electric expansion valve 8 is connected between condenser 4 and the first electric expansion valve 7, and subcooler 5 is connected to cross valve 3 the 4th port 33 and electronic two-way valve 9.
in addition, single module also comprises the first magnetic valve 10, check valve 11, first magnetic valve 10, check valve 11 are in parallel with electronic two-way valve 9 after connecting, and wherein the entrance of check valve 11 is connected between electronic two-way valve 9 and interior machine.A stop valve 12 can be connected between subcooler 5 with interior machine.
the several main duty of this multiple on-line system under following tool introduction:
as shown in Figure 2: when system be in heat normally run time: the cold-producing medium of HTHP is from compressor 1, oil eliminator 2, cross valve 3 first port 30 and the 4th port 33, electronic two-way valve 9 to flowing to interior machine; Cold-producing medium from interior machine through subcooler 5, first electric expansion valve 7, condenser 4, cross valve 3 second port 31 and the 3rd port 32, gas-liquid separator 6 to compressor 1.When low pressure is lower time (fast frosting or Frost formation process in time) the first electric expansion valve 7 is opened certain aperture, by the refrigerant branches of HTHP, some extremely pass through on the cold-producing medium main road after the first electric expansion valve 7 throttling expansion, enter outer machine heat exchanger together, can frosting be delayed.
as shown in Figure 3: when certain outer machine frosting, its compressor frequency reducing, electronic two-way valve 9 is closed, and cross valve 3 commutates, and switches to defrost process, and the outer machine of other single modules in parallel with it also can normal heating operation.The cold-producing medium of the HTHP of the outer machine of this defrosting is from compressor 1, oil eliminator 2, cross valve 3 first port 30 and the second port 31, condenser 4, second electric expansion valve 8, subcooler 5, cross valve 3 the 4th port 33 and the 3rd port 32, gas-liquid separator 6 to compressor 1; The cold-producing medium of HTHP from interior machine through subcooler 5, first electric expansion valve 7, second electric expansion valve 8, subcooler 5, cross valve 3 the 4th port 33 and the 3rd port 32, gas-liquid separator 6 to compressor 1;
the cold-producing medium of its besides machine HTHP is from compressor 1, oil eliminator 2, cross valve 3 first port 30 and the 4th port 33, electronic two-way valve 9 to flowing to interior machine; Cold-producing medium from interior machine through subcooler 5, first electric expansion valve 7, condenser 4, cross valve 3 second port 31 and the 3rd port 32, gas-liquid separator 6 to compressor 1.
during uninterrupted Defrost operation: the second electric expansion valve 8 of the outer machine that defrosts opens certain aperture, the frequency reducing of system all compressors 1, after frequency reduces, electronic two-way valve 9 is shut, other normally run the outer machine that heats according to heating regulating frequency normally, are opened the first magnetic valve 10 in parallel with electronic two-way valve 9 for the outer machine of defrosting; By the outer machine power down of outer machine cross valve 3 of defrosting, unit operation defrosting mode, the second electric expansion valve 8 of the outer machine that defrosts opens certain aperture according to the pressure and temperature of system, and outdoor unit frequency is raised to corresponding defrosting frequency.When the off-premises station defrosted has defrosted, first slowly closed by the second electric expansion valve 8 and powered on by cross valve 3 simultaneously, opened by electronic two-way valve 9, the second electric expansion valve 8 has been closed, and recovers normal heating mode.
as shown in Figure 4: heating condition and in time heating high-pressure and be too high, the second electric expansion valve 8 is opened certain aperture, heat can be made to be distributed by outer machine heat exchanger, effectively can reduce high-pressure, prevent high pressure too high.The cold-producing medium of HTHP is from compressor 1, oil eliminator 2, cross valve 3 first port 30 and the 4th port 33, electronic two-way valve 9 to flowing to interior machine; The cold-producing medium of HTHP from interior machine through subcooler 5, first electric expansion valve 7, a part through condenser 4, cross valve 3 second port 31 and the 3rd port 32, gas-liquid separator 6 to compressor 1, another part through the second electric expansion valve 8, subcooler 5, electronic two-way valve 9 to flowing to interior machine.
as shown in Figure 5: when system be in refrigeration normally run time: the cold-producing medium of HTHP is from compressor 1, oil eliminator 2, cross valve 3 first port 30 and the second port 31, condenser 4, first electric expansion valve 7, subcooler 5 to flowing to interior machine; The cold-producing medium of low-temp low-pressure from interior machine through electronic two-way valve 9, cross valve 3 the 4th port 33 and the 3rd port 32, gas-liquid separator 6 to compressor 1.
when system be in freezed cold operation time: the cold-producing medium of HTHP is from compressor 1, oil eliminator 2, cross valve 3 first port 30 and the second port 31, condenser 4, a part through the first electric expansion valve 7, subcooler 5 to flowing to interior machine, and another part is through the second electric expansion valve 8, subcooler 5, cross valve 3 the 4th port 33 and the 3rd port 32 gas-liquid separator 6 to compressor 1; The cold-producing medium of low-temp low-pressure from interior machine through electronic two-way valve 9, cross valve 3 the 4th port 33 and the 3rd port 32 gas-liquid separator 6 to compressor 1.
in addition, when the cross valve 3 of certain outer machine breaks down, the electronic two-way valve 9 of this unit is closed automatically, and this loop is cut off, thus does not affect other outer machines, and now system can continue to run well.
above-described embodiment, only for technical conceive of the present invention and feature are described, its object is to person skilled in the art can be understood content of the present invention and implement according to this, can not limit the scope of the invention with this.All equivalences done according to Spirit Essence of the present invention change or modify, and all should be encompassed within protection scope of the present invention.

Claims (8)

1. the multiple on-line system that independently defrosts of an energy single module, it is characterized in that: comprise the multiple described single modules be arranged in parallel, each described single module comprises: compressor, oil eliminator, cross valve, condenser, subcooler, gas-liquid separator, the first electric expansion valve, the second electric expansion valve and electronic two-way valve
Described compressor is connected to described oil eliminator, described oil eliminator is connected to described cross valve first port, described cross valve second port is connected to described condenser, described condenser is connected to the first electric expansion valve, the first described electric expansion valve is connected to described subcooler, and described subcooler is connected to interior machine; Described cross valve the 3rd port is connected to described gas-liquid separator, and described gas-liquid separator is connected to described compressor; Described cross valve the 4th port is connected to described electronic two-way valve, and described electronic two-way valve is connected to interior machine; Subcooler described in the second described electric expansion valve connects formed cold loop, described crosses in cold loop: the second described electric expansion valve is connected between described condenser and the first electric expansion valve, and described subcooler is connected to described cross valve the 4th port and electronic two-way valve.
2. according to claim 1 a kind of can the multiple on-line system that independently defrosts of single module, it is characterized in that: described single module also comprises the first magnetic valve and check valve, be in parallel with described electronic two-way valve after the series connection of the first described magnetic valve, check valve.
3. according to claim 1 a kind of can the multiple on-line system that independently defrosts of single module, it is characterized in that: when described system be in heat normally run time: cold-producing medium is from described compressor, oil eliminator, cross valve, electronic two-way valve to flowing to interior machine; Cold-producing medium from machine in described through subcooler, the first electric expansion valve, condenser, cross valve, gas-liquid separator to compressor.
4. according to claim 1 a kind of can the multiple on-line system that independently defrost of single module, it is characterized in that: when the outer machine of the single module in described system described in defrosts: this outer machine defrosts the cold-producing medium of single module from described compressor, oil eliminator, cross valve, condenser, the second electric expansion valve, subcooler, cross valve, gas-liquid separator to compressor; Cold-producing medium from interior machine through subcooler, the first electric expansion valve, the second electric expansion valve, subcooler, cross valve, gas-liquid separator to compressor;
The cold-producing medium of the single module described in all the other is from described compressor, oil eliminator, cross valve, electronic two-way valve to flowing to interior machine; Cold-producing medium from machine in described through subcooler, the first electric expansion valve, condenser, cross valve, gas-liquid separator to compressor.
5. according to claim 1 a kind of can the multiple on-line system that independently defrosts of single module, it is characterized in that: when described system heats pressure anomaly rising: cold-producing medium is from described compressor, oil eliminator, cross valve, electronic two-way valve to flowing to interior machine; Cold-producing medium from machine in described through subcooler, the first electric expansion valve, a part through condenser, cross valve, gas-liquid separator to compressor, another part through the second electric expansion valve, subcooler, electronic two-way valve to flowing to interior machine.
6. according to claim 1 a kind of can the multiple on-line system that independently defrosts of single module, it is characterized in that: when described system be in refrigeration normally run time: cold-producing medium is from described compressor, oil eliminator, cross valve, condenser, the first electric expansion valve, subcooler to flowing to interior machine; Cold-producing medium from machine in described through electronic two-way valve, cross valve, gas-liquid separator to compressor.
7. according to claim 6 a kind of can the multiple on-line system that independently defrosts of single module, it is characterized in that: when described system be in freezed cold operation time: cold-producing medium from described compressor, oil eliminator, cross valve, condenser, a part through the first described electric expansion valve, subcooler to flowing to interior machine, another part through the second described electric expansion valve, subcooler, cross valve, gas-liquid separator to compressor; Cold-producing medium from machine in described through electronic two-way valve, cross valve, gas-liquid separator to compressor.
8. according to claim 1 a kind of can the multiple on-line system that independently defrosts of single module, it is characterized in that: described electronic two-way valve is replaced by the second magnetic valve.
CN201410557615.4A 2014-10-20 The multiple on-line system that a kind of energy single module independently defrosts Active CN104296414B (en)

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Application Number Priority Date Filing Date Title
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CN104296414B CN104296414B (en) 2017-01-04

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CN106288546A (en) * 2016-09-09 2017-01-04 珠海格力电器股份有限公司 A kind of Modular multi-connected air conditioner system and defrosting control method thereof
CN106322558A (en) * 2016-09-09 2017-01-11 广东美的暖通设备有限公司 Multi-split air conditioner system as well as outdoor unit, defrosting control method and device thereof
CN109945330A (en) * 2019-03-22 2019-06-28 珠海格力电器股份有限公司 The refrigeration system and defrosting control method of energy continuous heating
CN110926071A (en) * 2019-11-08 2020-03-27 广东芬尼克兹节能设备有限公司 Intelligent defrosting control method and system for heat pump system
CN112539520A (en) * 2020-12-17 2021-03-23 珠海格力电器股份有限公司 Defrosting control method and device and multi-split air conditioner

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CN106322558A (en) * 2016-09-09 2017-01-11 广东美的暖通设备有限公司 Multi-split air conditioner system as well as outdoor unit, defrosting control method and device thereof
CN106322558B (en) * 2016-09-09 2019-12-10 广东美的暖通设备有限公司 Multi-split air conditioner system, outdoor unit of multi-split air conditioner system, and defrosting control method and device
CN106288546B (en) * 2016-09-09 2022-04-01 珠海格力电器股份有限公司 Modular multi-split air conditioning system and defrosting control method thereof
CN109945330A (en) * 2019-03-22 2019-06-28 珠海格力电器股份有限公司 The refrigeration system and defrosting control method of energy continuous heating
WO2020192202A1 (en) * 2019-03-22 2020-10-01 珠海格力电器股份有限公司 Refrigeration system and defrosting control method
CN110926071A (en) * 2019-11-08 2020-03-27 广东芬尼克兹节能设备有限公司 Intelligent defrosting control method and system for heat pump system
CN112539520A (en) * 2020-12-17 2021-03-23 珠海格力电器股份有限公司 Defrosting control method and device and multi-split air conditioner
CN112539520B (en) * 2020-12-17 2021-10-22 珠海格力电器股份有限公司 Defrosting control method and device and multi-split air conditioner

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