CN105674648A - Heating-based defrost control method of multi-split air-conditioning system - Google Patents
Heating-based defrost control method of multi-split air-conditioning system Download PDFInfo
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- CN105674648A CN105674648A CN201610206774.9A CN201610206774A CN105674648A CN 105674648 A CN105674648 A CN 105674648A CN 201610206774 A CN201610206774 A CN 201610206774A CN 105674648 A CN105674648 A CN 105674648A
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- heating
- indoor
- conditioning system
- indoor set
- defrosting
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- 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
- F25B47/00—Arrangements for preventing or removing deposits or corrosion, not provided for in another subclass
- F25B47/02—Defrosting cycles
- F25B47/022—Defrosting cycles hot gas defrosting
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- 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
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Air Conditioning Control Device (AREA)
- Compression-Type Refrigeration Machines With Reversible Cycles (AREA)
Abstract
The invention provides a heating-based defrost control method of a multi-split air-conditioning system. Each indoor machine and each outdoor machine are respectively provided with one switch valve for controlling operation of each indoor machine or each outdoor machine. The method comprises the following steps of: when the multi-split air-conditioning system is in an indoor heating operation state, judging whether a defrost condition is met or not; if the defrost condition is met, switching operation of a four-way valve so as to enable the outdoor machines to perform heating-based defrosting, and regulating to close at least one switch valve of one indoor machine needing to further heat among the multiple indoor machines; and regulating to open at least one switch valve of residual indoor machines except for the indoor machine needing to further heat. The heating-based defrost control method is capable of effectively overcoming the defects that a refrigerant of an air conditioner in the prior art inevitably absorbs away heat during a heating-based defrosting process to cause indoor temperature decrease and influence on indoor human body comfort, and reducing occurrence of a situation that temperature in a heating indoor machine room is reduced due to heat absorption of a low-temperature refrigerant for defrosting during a defrosting process to the greatest extent.
Description
Technical field
The invention belongs to air-conditioning technical field, be specifically related to a kind of multi-online air-conditioning system heating and defrosting control method.
Background technology
Air-conditioner of the prior art is when indoor heating, off-premises station often there will be the phenomenon of frosting at low ambient temperatures, prior art is then generally adopted the method for hot gas defrosting and defrosts, namely by the commutation of cross valve, formation kind of refrigeration cycle carries out, the high-temperature gas coolant that compressor is discharged first passes through outdoor heat converter, defrosts. But adopt the air-conditioner of this technology when defrosting, owing to belonging to refrigerating operaton, namely coolant first becomes low temperature liquid after defrosting on outdoor heat converter, when flowing through indoor set, owing to refrigerant temperature is low, inevitably draw heat indoor, and owing to during defrosting and after defrosting, in a period of time, indoor cannot provide heat, cause that indoor temperature reduces excessive, affect user satisfaction.
Owing to air-conditioning of the prior art inevitably leads to the indoor technical problem causing temperature to reduce, affect Indoor Thermal Comfort in Passive because of being absorbed heat by coolant when heating and defrosting, therefore research design of the present invention goes out a kind of multi-online air-conditioning system heating and defrosting control method.
Summary of the invention
Therefore, the technical problem to be solved in the present invention is in that to overcome air-conditioning of the prior art inevitably to cause that indoor temperature reduces, affects the defect of Indoor Thermal Comfort in Passive because of coolant heat absorption when heating and defrosting, thus providing a kind of multi-gang air-conditioner heating and defrosting control method.
The present invention provides a kind of multi-online air-conditioning system heating and defrosting control method, each of which indoor set and off-premises station are each respectively equipped with one and control its switch valve each worked, when multi-online air-conditioning system is under indoor heating running status, judge whether it meets defrosting condition, if meeting, switching cross valve action makes off-premises station heating and defrosting, and regulate the switch valve of at least one closedown in the indoor set needing to continue to heat in multiple indoor set, and the switch valve of at least one regulating all the other indoor sets except needing the indoor set continuing to heat is opened.
Preferably, in heating operation, when system meets the defrosting condition carrying out off-premises station, after switching cross valve commutation action, first judge whether standard-sized sheet runs current multiple indoor set.
Preferably, when the multiple indoor sets in multi-online air-conditioning system are the operation of non-standard-sized sheet, at least one switch valve heating indoor set that regulating wherein starts shooting runs cuts out, and the switch valve simultaneously regulating at least one indoor set being wherein not keyed up operation is opened.
Preferably, the switch valve regulating the hot indoor set of the ownership run of starting shooting in the indoor set of multiple non-standard-sized sheet cuts out.
Preferably, the switch valve regulating all indoor sets being not keyed up operation in the indoor set of multiple non-standard-sized sheet is fully open.
Preferably, when the multiple indoor sets in multi-online air-conditioning system are standard-sized sheet operation, set at least one VIP room, and regulate at least one in all VIP rooms and heat the switch valve closedown of indoor set, and adjustment simultaneously removes at least one switch valve heating indoor set that beyond all VIP rooms, all the other starts run and opens.
Preferably, the switch valve Close All heating indoor set of all VIP rooms is regulated.
Preferably, the switch valve removing the hot indoor set of the ownership that all the other starts beyond all VIP rooms run is regulated fully open.
Preferably, after defrosting process terminates, detecting whether whole multi-online air-conditioning system meets the situation releasing defrosting, if met, performing next step action; If be unsatisfactory for, continue to return the action performing defrosting.
Preferably, next step action described is that switching cross valve action makes air conditioning system perform the work process of indoor set heating operation.
A kind of multi-online air-conditioning system heating and defrosting control method provided by the invention has the advantages that
1. inevitably can cause that indoor temperature reduces, affects the defect of Indoor Thermal Comfort in Passive because of coolant heat absorption efficiently against air-conditioning of the prior art when heating and defrosting, farthest reducing heats between interior machine room during defrosting, and the situation that the temperature that the low temperature coolant heat absorption because defrosting causes reduces occurs;
2. multiple on-line system heats the non-standard-sized sheet of interior machine and runs, and during system Defrost operation, flows through without low temperature coolant and heats interior machine, it is to avoid absorbs heat indoor and causes heating the generation of the situation of indoor temperature reduction;
3. multiple on-line system heats the operation of interior machine standard-sized sheet, during system Defrost operation, flows through VIP without coolant and heats interior machine, it is to avoid cause that VIP heats the generation of the situation that indoor temperature reduces from the heat absorption of this indoor set.
Accompanying drawing explanation
Fig. 1 is heating and defrosting schematic flow sheet of the prior art;
Fig. 2 is the heating and defrosting schematic flow sheet of the present invention;
Fig. 3 is the multi-online air-conditioning system loop structure schematic diagram of the present invention;
Fig. 4 is the loop structure schematic diagram during multi-online air-conditioning system defrosting of the present invention.
In figure, accompanying drawing labelling is expressed as:
1 compressor, 2 cross valves, 3 outdoor heat converters, 4 outdoor electrical expansion valves, 51 is off-premises station liquid side stop valve, 52 off-premises station gas side stop valves, 61～6n electronic expansion valve of indoor unit, 71～7n indoor heat converter, 81～8n indoor set, 9 off-premises stations.
Detailed description of the invention
As shown in Figure 2, the present invention provides a kind of multi-online air-conditioning system heating and defrosting control method, each indoor set and off-premises station are each respectively equipped with one and control its switch valve each worked (being preferably expansion valve), wherein when multi-online air-conditioning system is under indoor heating running status, judge whether whole system meets defrosting condition, if meet defrosting condition, switching cross valve action makes off-premises station heating and defrosting, and the switch valve (being preferably expansion valve) of the indoor set of at least one that regulating needs in multiple indoor set to continue to heat cuts out, and the switch valve of at least one (be preferably expansion valve) regulating all the other indoor sets opens, make the not refrigeration cool-down of at least one in the specific interior machine that above-mentioned needs continue to heat.
When the control method of the present invention makes in Defrost operation process, close during being defrosted by system and heat interior machine switch valve (being preferably electric expansion valve), prevent the low temperature coolant after outdoor defrosting from flowing through this and heat interior machine, absorb heat from heating room, at utmost reduce the temperature reduction heating interior machine region during defrosting.
Because of coolant heat absorption, the present invention inevitably can cause that indoor temperature reduces, affects the defect of Indoor Thermal Comfort in Passive efficiently against air-conditioning of the prior art when heating and defrosting, farthest reducing heats between interior machine room during defrosting, and the situation that the temperature that the low temperature coolant heat absorption because defrosting causes reduces occurs.
Preferably, in heating operation, when system meets the defrosting condition carrying out off-premises station, after switching cross valve commutation action, first judge whether standard-sized sheet runs current multiple indoor set. Cross valve is commutated and judges whether standard-sized sheet runs current multiple indoor set after action, effectively can belong to standard-sized sheet operation according to multiple indoor sets and belong to the control operating procedure that the operation formulation of non-standard-sized sheet is different with multiple indoor sets, the operation of multi-online air-conditioning system so can be divided into two groups and control operational approach and step, accomplish the purpose being precisely controlled.
Preferably, when the multiple indoor sets in multi-online air-conditioning system are the operation of non-standard-sized sheet, at least one switch valve (being preferably expansion valve) heating indoor set that regulating starts shooting in the indoor set of multiple non-standard-sized sheet runs cuts out, and the switch valve (being preferably expansion valve) simultaneously regulating at least one indoor set being not keyed up operation in the indoor set of multiple non-standard-sized sheet is opened. when the non-standard-sized sheet of multiple indoor sets runs, close by regulating at least one switch valve (being preferably expansion valve) heating indoor set run of starting shooting in the indoor set of multiple non-standard-sized sheet, can effectively make start run heat in indoor set at least one defrosting process do not have cold-producing medium flow into and this indoor set is absorbed heat thus reducing the temperature of these indoor, open by regulating the switch valve (being preferably expansion valve) of at least one indoor set being not keyed up operation in the indoor set of multiple non-standard-sized sheet, at least one in the indoor set being not keyed up running can be effectively made to form the effect of evaporation endothermic in defrosting process, to complete kind of refrigeration cycle, thus reaching the purpose to off-premises station heating and defrosting.
Preferably, the switch valve (being preferably expansion valve) regulating the hot indoor set of the ownership run of starting shooting in the indoor set of multiple non-standard-sized sheet cuts out. This is a kind of preferred adjustment control method, the switch valve (being preferably expansion valve) of the hot indoor set of the ownership run of starting shooting in the indoor set of multiple non-standard-sized sheets all control as cutting out, can effectively make the hot indoor set of the ownership that start runs all not have low-temperature refrigerant to flow into, and then will not be absorbed heat in the indoor corresponding to all indoor sets that all starts run, to reduce the temperature in heating chamber, avoid affecting the comfortableness of human body better.
Preferably, the switch valve (being preferably expansion valve) regulating all indoor sets being not keyed up operation in the indoor set of multiple non-standard-sized sheet is fully open. this is also a kind of preferred adjustment control method, the switch valve (being preferably expansion valve) being not keyed up all indoor sets of operation in the indoor set of multiple non-standard-sized sheets is all controlled as opening, the all indoor sets being not keyed up running can be effectively made all to have the inflow of low-temperature refrigerant, and then by the indoor corresponding to all indoor sets being not keyed up and running are evaporated heat absorption, because above-mentioned indoor itself are not required to the effect heated, so can improve the efficiency of the kind of refrigeration cycle of whole multi-online air-conditioning system, and improve defrosting efficiency when whole multi-online air-conditioning system defrosts, quick as far as possible to obtain, it is fully completed the purpose of defrosting.
Preferably, when the multiple indoor sets in multi-online air-conditioning system are standard-sized sheet operation, set at least one VIP room, and the switch valve (being preferably expansion valve) heating indoor set of at least one VIP room that regulating starts shooting in the indoor set of multiple standard-sized sheet runs cuts out, and the switch valve (being preferably expansion valve) simultaneously regulating at least one indoor set that all the other starts run in the indoor set of multiple standard-sized sheet opens (all interior rooms of all VIP rooms+all the other room=multi-online air-conditioning systems all). when multiple indoor set standard-sized sheets run, if because now switching cross valve is to off-premises station heating and defrosting, multiple indoor sets all can form refrigeration, then can largely effect on and reduce the ambient temperature of indoor, then by the control method of the present invention, by setting at least one VIP room (VIP Room), and the switch valve (being preferably expansion valve) heating indoor set of at least one VIP room that regulating starts shooting in the indoor set of multiple standard-sized sheet runs cuts out, the indoor set that heats that can effectively make at least one VIP room does not have cold-producing medium inflow in system defrosting process and this indoor set is absorbed heat thus reducing this temperature indoor at least one VIP, ensure that the effective temperature of VIP room is unlikely to be lowered because of defrosting, open by regulating the switch valve (being preferably expansion valve) of at least one indoor set that all the other starts run in the indoor set of multiple standard-sized sheet, at least one in the indoor set of all the other start operations above-mentioned can be effectively made to form the effect of evaporation endothermic in defrosting process, to complete kind of refrigeration cycle, thus reaching the purpose to off-premises station heating and defrosting.
Preferably, the switch valve (being preferably expansion valve) heating indoor set of all VIP rooms that regulating starts shooting in the indoor set of multiple standard-sized sheet runs cuts out. This is a kind of preferred adjustment control method, the switch valve (being preferably expansion valve) heating indoor set of all VIP rooms run starting shooting in the indoor set of multiple standard-sized sheets all controls as cutting out, the indoor set that heats that can effectively make all VIP rooms of start operation does not all have low-temperature refrigerant inflow, and then will not be absorbed heat in the VIP indoor corresponding to all VIP rooms indoor set that all starts run, heat the indoor temperature of all VIP to reduce, avoid affecting the comfortableness of human body better.
Preferably, the switch valve (being preferably expansion valve) regulating all indoor sets that all the other starts run in the indoor set of multiple standard-sized sheet is fully open. this is also a kind of preferred adjustment control method, the switch valve (being preferably expansion valve) of all indoor sets all the other starts in the indoor set of multiple standard-sized sheets run all controls as opening, all indoor sets that all the other starts run can be effectively made all to have the inflow of low-temperature refrigerant, and then by the indoor corresponding to the indoor set of all the other all start operations are evaporated heat absorption, because although all the other indoor needs above-mentioned heat, but its indoor heat can be accomplished suitably to reduce for VIP room, temperature suitably can reduce, the effect to off-premises station heating and defrosting is reached by suitably reducing indoor temperature, so can improve the efficiency of the kind of refrigeration cycle of whole multi-online air-conditioning system, and improve defrosting efficiency when whole multi-online air-conditioning system defrosts, quick as far as possible to obtain, it is fully completed the purpose of defrosting.
Preferably, after defrosting process terminates, detecting whether whole multi-online air-conditioning system meets the situation releasing defrosting, if met, performing next step action; If be unsatisfactory for, continue to return the action performing defrosting. So can carry out the operating procedure performing defrosting circularly according to testing result to release the effect of off-premises station frosting so that air-conditioning can continue to be continued under outdoor cryogenic conditions, indoor being heated.
Preferably, next step action described is that switching cross valve action makes air conditioning system perform the work process of heating operation. This Rule of judgment is that multi-online air-conditioning system meets the condition releasing defrosting, namely the frost that off-premises station surface is tied substantially has eliminated or has eliminated to reach requirement so that air conditioning system can continue to heating operation, therefore cross valve switching action now can make air conditioning system perform the work process of heating operation effectively, reach the purpose and the effect that continue indoor to heat.
Preferably, when described defrosting condition is unsatisfactory for, returns and continue executing with air conditioning system heating operation. Now air-conditioner outdoor unit not frosting is described or and not up to needing the degree defrosted to affect the properly functioning of air conditioning system. The judgement of this condition is based on the judgement of first step defrosting condition and carries out, and is unsatisfactory for defrosting condition and then makes air conditioning system continue heating operation, and now institute's frosting is described and is unlikely to affect the normal heating operation of air conditioning system.
Operation principle and the preferred embodiment of the present invention are described below
Detailed process: illustrated by example below
As it is shown on figure 3, one drags in the multiple on-line system of three, indoor set is 81,82 and 8n, and wherein 82 are set to VIP indoor set. In heating operation, when system meets the Defrost operation carrying out off-premises station 9, as shown in Figure 4, first judge whether standard-sized sheet runs current indoor machine.
As shown in Figure 4, if indoor set 81,82 and 8n standard-sized sheet run, after cross valve 2 action, system switches to kind of refrigeration cycle, and now the electric expansion valve 62 of machine is closed in 82, and the electric expansion valve 61 of all the other indoor sets 81 and 8n indoor set and 6n keep standard-sized sheet. After defrosting on outdoor heat converter 3 from the high-temperature gas coolant of compressor 1 discharge, become low temperature liquid coolant, flow into indoor through liquid side stop valve 51, but due to above-mentioned indoor set expansion valve action, coolant does not flow through 82 indoor sets the draw heat of VIP. Coolant, after indoor set exports parallel connection, returns to off-premises station 9 through gas side stop valve 52, is back to compressor then through cross valve 2. After defrosting terminates, 82 electronic expansion valve of indoor unit 62 of VIP recover usual control.
If as it is shown on figure 3, only indoor set 81 run, i.e. the non-standard-sized sheet of all indoor sets, after cross valve 2 action, system switches to kind of refrigeration cycle, and now the electric expansion valve 61 of 81 indoor sets is closed, the electric expansion valve 62 of all the other indoor sets 82 and 8n and 6n standard-sized sheet. After the high-temperature gas coolant so discharged from compressor 1 defrosts on outdoor heat converter 3, become low temperature liquid coolant, flow into indoor through liquid side stop valve 51, but due to above-mentioned indoor set expansion valve action, coolant does not flow through 81 indoor sets draw heat. Coolant, after indoor set exports parallel connection, returns to off-premises station 9 through gas side stop valve 52, is back to compressor then through cross valve 2. After defrosting terminates, 81 electronic expansion valve of indoor unit 61 recover usual control.
It is to say, the indoor set of setting VIP is when indoor set standard-sized sheet heating operation defrosts, VIP indoor set does not have low temperature cold matchmaker and flows through.
By above-mentioned control, it is possible to the low temperature coolant during farthest reducing because of defrosting flows through and heats indoor set, and the situation that room temperature during defrosting reduces occurs.
Those skilled in the art will readily understand, under the premise do not conflicted, above-mentioned each advantageous manner can freely combine, superposition.
The foregoing is only presently preferred embodiments of the present invention, not in order to limit the present invention, all any amendment, equivalent replacement and improvement etc. made within the spirit and principles in the present invention, should be included within protection scope of the present invention. The above is only the preferred embodiment of the present invention; it should be pointed out that, for those skilled in the art, under the premise without departing from the technology of the present invention principle; can also making some improvement and modification, these improve and modification also should be regarded as protection scope of the present invention.
Claims (10)
1. a multi-online air-conditioning system heating and defrosting control method, it is characterized in that: each indoor set and off-premises station are each respectively equipped with one and control its switch valve each worked, when multi-online air-conditioning system is under indoor heating running status, judge whether it meets defrosting condition, if meeting, switching cross valve action makes off-premises station heating and defrosting, and regulate the switch valve of at least one closedown in the indoor set needing to continue to heat in multiple indoor set, and the switch valve of at least one regulated in all the other indoor sets except needing the indoor set continuing to heat is opened.
2. multi-online air-conditioning system heating and defrosting control method according to claim 1, it is characterized in that: in heating operation, when system meets the defrosting condition carrying out off-premises station, after switching cross valve commutation action, first judge whether standard-sized sheet runs current multiple indoor set.
3. multi-online air-conditioning system heating and defrosting control method according to claim 2, it is characterized in that: when the multiple indoor sets in multi-online air-conditioning system are the operation of non-standard-sized sheet, at least one switch valve heating indoor set that regulating wherein starts shooting runs cuts out, and the switch valve simultaneously regulating at least one indoor set being wherein not keyed up operation is opened.
4. multi-online air-conditioning system heating and defrosting control method according to claim 3, it is characterised in that: the switch valve regulating the hot indoor set of the ownership run of starting shooting in the indoor set of multiple non-standard-sized sheet cuts out.
5. according to the multi-online air-conditioning system heating and defrosting control method one of claim 3-4 Suo Shu, it is characterised in that: the switch valve regulating all indoor sets being not keyed up operation in the indoor set of multiple non-standard-sized sheet is fully open.
6. multi-online air-conditioning system heating and defrosting control method according to claim 2, it is characterized in that: when the multiple indoor sets in multi-online air-conditioning system are standard-sized sheet operation, set at least one VIP room, and regulate at least one in all VIP rooms and heat the switch valve closedown of indoor set, and adjustment simultaneously removes at least one switch valve heating indoor set that beyond all VIP rooms, all the other starts run and opens.
7. multi-online air-conditioning system heating and defrosting control method according to claim 6, it is characterised in that: regulate the switch valve Close All heating indoor set of all VIP rooms.
8. according to the multi-online air-conditioning system heating and defrosting control method one of claim 6-7 Suo Shu, it is characterised in that: regulate the switch valve removing the hot indoor set of the ownership that all the other starts beyond all VIP rooms run fully open.
9. according to the multi-online air-conditioning system heating and defrosting control method one of claim 1-8 Suo Shu, it is characterized in that: after defrosting process terminates, detecting whether whole multi-online air-conditioning system meets the situation releasing defrosting, if met, performing next step action; If be unsatisfactory for, continue to return the action performing defrosting.
10. multi-online air-conditioning system heating and defrosting control method according to claim 9, it is characterised in that: next step action described is that switching cross valve action makes air conditioning system perform the work process of indoor set heating operation.
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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106322580A (en) * | 2016-08-16 | 2017-01-11 | 广东美的暖通设备有限公司 | Multi-split air conditioning system and defrosting control method and defrosting control device therefor |
| CN108302651A (en) * | 2016-09-18 | 2018-07-20 | 苏州三星电子有限公司 | A kind of multi-gang air-conditioner outdoor machine system and its Defrost method |
| CN108775741A (en) * | 2018-05-24 | 2018-11-09 | 青岛海尔空调器有限总公司 | Air conditioner defrosting control method |
| CN108800441A (en) * | 2018-06-25 | 2018-11-13 | 宁波奥克斯电气股份有限公司 | Multi-connected machine defrosting control method and air conditioning multi-couple machine system |
| WO2019015444A1 (en) * | 2017-07-19 | 2019-01-24 | 青岛海尔空调电子有限公司 | Defrosting control method for multi-split system |
| CN109458700A (en) * | 2018-11-08 | 2019-03-12 | 珠海格力电器股份有限公司 | Multi-connected machine defrosting method, device, storage medium, computer equipment and air-conditioning |
| CN109506401A (en) * | 2018-11-09 | 2019-03-22 | 珠海格力电器股份有限公司 | A kind of defrosting control method, system and the storage medium of multi-connected machine heat pump |
| CN110332653A (en) * | 2019-07-10 | 2019-10-15 | 珠海格力电器股份有限公司 | Outdoor unit defrosting control method, device and equipment |
| CN110671743A (en) * | 2019-10-24 | 2020-01-10 | 宁波奥克斯电气股份有限公司 | Defrosting control method and device for multi-split air conditioner and multi-split air conditioner |
| CN112665117A (en) * | 2019-10-16 | 2021-04-16 | 广东美的制冷设备有限公司 | Multi-online defrosting method and device, multi-online air conditioning system and readable storage medium |
| CN112797570A (en) * | 2020-12-30 | 2021-05-14 | 宁波奥克斯电气股份有限公司 | Defrosting control method, defrosting device and multi-connected air conditioning system |
| CN113944987A (en) * | 2021-11-24 | 2022-01-18 | 广东美的制冷设备有限公司 | Control method, device and equipment of air conditioning system and storage medium |
| CN114322206A (en) * | 2020-09-29 | 2022-04-12 | 美的集团武汉制冷设备有限公司 | Multi-split air conditioner and defrosting method, control device and storage medium thereof |
| CN114963278A (en) * | 2021-08-23 | 2022-08-30 | 青岛海尔新能源电器有限公司 | Intelligent defrosting control method and device, electronic equipment and storage medium |
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