CN106196684B - The multi-functional multi-connected air conditioning system of three control of one kind and its control method - Google Patents
The multi-functional multi-connected air conditioning system of three control of one kind and its control method Download PDFInfo
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- CN106196684B CN106196684B CN201610882830.0A CN201610882830A CN106196684B CN 106196684 B CN106196684 B CN 106196684B CN 201610882830 A CN201610882830 A CN 201610882830A CN 106196684 B CN106196684 B CN 106196684B
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- evaporator
- computer room
- compressor
- indoor
- condenser
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Classifications
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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
- F25B7/00—Compression machines, plants or systems, with cascade operation, i.e. with two or more circuits, the heat from the condenser of one circuit being absorbed by the evaporator of the next circuit
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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
- F25B41/00—Fluid-circulation arrangements
- F25B41/20—Disposition of valves, e.g. of on-off valves or flow control valves
- F25B41/22—Disposition of valves, e.g. of on-off valves or flow control valves between evaporator and compressor
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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
- F25B41/00—Fluid-circulation arrangements
- F25B41/30—Expansion means; Dispositions thereof
-
- 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
- F25B47/006—Arrangements for preventing or removing deposits or corrosion, not provided for in another subclass for preventing frost
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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
- F25B2313/00—Compression machines, plants or systems with reversible cycle not otherwise provided for
- F25B2313/007—Compression machines, plants or systems with reversible cycle not otherwise provided for three pipes connecting the outdoor side to the indoor side with multiple indoor units
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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
- F25B2313/00—Compression machines, plants or systems with reversible cycle not otherwise provided for
- F25B2313/023—Compression machines, plants or systems with reversible cycle not otherwise provided for using multiple indoor units
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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)
Abstract
The invention belongs to air-conditioning technical fields, disclose the multi-functional multi-connected air conditioning system of three control of one kind and its control method, system includes: compressor, condenser, computer room evaporator, indoor evaporator, indoor evaporator, the first end of condenser pass through two branches respectively with suction port of compressor, outlet, the first end of computer room evaporator is connected to the entrance of compressor, and the first end of computer room evaporator is equipped with second throttling device；Indoor evaporator, the second end of computer room evaporator are equipped with first throttling device, and indoor evaporator, computer room evaporator, the second end of condenser are interconnected.By coupling multi-connected machine with air conditioner in machine room, the two can work independently the present invention, and the problems such as can dissolve the operation of multi-connected machine Smaller load, lubrication, oil return, frosting defrosting, start and stop, and recycling computer room waste heat saves space, reduces equipment cost；Second throttling device makes computer room evaporator have different evaporating temperatures from indoor evaporator, guarantees the refrigeration effect of computer room evaporator.
Description
Technical field
The present invention relates to air-conditioning technical fields, the in particular to multi-functional multi-connected air conditioning system of three control of one kind and its control
Method.
Background technique
With information industry digital Construction and the intelligentized fast development of household electrical appliances, computer room, base station quantity increase rapidly
Add, since data center's sensible heat load is big, building enclosure closing, so the air-conditioning system of computer room, base station needs whole day throughout the year
Wait refrigeration；And room air conditioning system is then mainly used for winter heating and cooling in summer, according to statistics computer room, base station air conditioner energy consumption account for
40% or more of its total energy consumption；Due to the operation of air-conditioning system and room air conditioning system in existing computer room, base station for radiating
Process is relatively independent；Equal low temperature seasons, room air conditioning system are mostly in heating working condition in winter, and computer room is still in cooling
Refrigerating state can not accomplish that computer room waste heat recycles, while two systems cost is more expensive, while that there is also compressors is low for room air conditioner
The use reliabilities problems such as frequency operation, cold-starting, lubrication, energy adjustment, while there is also frosting, defrostings to ask for room air conditioner
Topic, is unfavorable for the market competition of product.
Summary of the invention
(1) technical problems to be solved
The technical problem to be solved by the present invention is being separately provided to solve existing indoor combined air conditioners with air conditioner in machine room, nothing
The problems such as method recycles computer room waste heat, room conditioning is used there are compressor low-frequency operation, cold-starting, lubrication, energy adjustment etc..
(2) technical solution
In order to solve the above-mentioned technical problems, the present invention provides a kind of multi-functional multi-connected air conditioning systems of three control, comprising:
Compressor, condenser, for the equipment to computer room or base station carry out continue refrigeration computer room evaporator and at least one be used for
Indoor refrigeration or the indoor evaporator of heating, the indoor evaporator, that the first end of condenser passes through two bands is valvular
Branch respectively with the entrance of the compressor, outlet, the entrance of the first end of the computer room evaporator and the compressor
The first end of connection, the computer room evaporator is equipped with second throttling device；The second end of the indoor evaporator, computer room evaporator
It is equipped with first throttling device, the indoor evaporator, computer room evaporator, the second end of condenser are interconnected.
Wherein, the aperture of the second throttling device is adjustable.
Wherein, the second end of the computer room evaporator is equipped with the first throttling device.
Wherein, the first end or second end of the computer room evaporator are equipped with valve.
Wherein, the second end of the condenser is equipped with the first throttling device.
Wherein, the valve is solenoid valve.
Wherein, the entrance pipe of the compressor is equipped with gas-liquid separator.
The control method of the multi-functional multi-connected air conditioning system of three control described above is also disclosed in the present invention, by opening or
Each valve is closed to adjust the flow direction of refrigerant, to realize following working condition:
All refrigerating states: the refrigerant that the compressor comes out first passes through condenser heat rejection, then through the first segment
Stream device respectively enters the computer room evaporator, each indoor evaporator, eventually passes back in compressor；
Main body refrigerating state: the refrigerant that the compressor comes out first passes through condenser and part indoor evaporator is put
Then heat respectively enters the computer room evaporator, remaining indoor evaporator through the first throttling device, eventually passes back to compress
In machine；
Main body heats state: the refrigerant that the compressor comes out first passes through each indoor evaporator and carries out heat release, then passes through
The first throttling device respectively enters the computer room evaporator, condenser, eventually passes back in compressor；
Total heat recovery state: the refrigerant that the compressor comes out first passes through part indoor evaporator and carries out heat release, then
Enter the computer room evaporator through the first throttling device, eventually passes back in compressor.
Wherein, by adjusting the aperture of the second throttling device, keep indoor evaporator different from the acquisition of computer room evaporator
Evaporating temperature.
(3) beneficial effect
Above-mentioned technical proposal has the advantages that a kind of multi-functional multi-connected air conditioning system of three control of the invention and its control
Method, by the way that the multi-connected air conditioning system and the refrigerated air-conditioning system of computer room or base station that are used for indoor refrigeration or heating to be coupled to
Together, the heat recovery at computer room evaporator is realized, frosting defrosting problem is avoided；It saves space and equipment, equipment cost is big
It is big to reduce；Not only it had been able to achieve the lasting refrigeration of computer room or base station, but also the working condition of each indoor evaporator, each room can be adjusted at any time
The functions such as heating, refrigeration, the heating of part refrigerating part may be implemented in interior evaporator, meet the needs of different user；Computer room evaporation
The problems such as device is in running order at any time, and there is no cold-startings, lubrication when indoor evaporator is opened, it is low to also avoid compressor
The problem of frequency is run；The setting of second throttling device, so that pipeline where computer room evaporator and indoor evaporator pipeline have not
Same pressure and evaporating temperature guarantees the refrigeration effect of computer room evaporator.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the multi-functional multi-connected air conditioning system of three control of the present invention；
Fig. 2 is the working principle diagram that air-conditioning system of the present invention is in all refrigerating states；
Fig. 3 is the working principle diagram that air-conditioning system of the present invention is in main body refrigerating state；；
Fig. 4 is the working principle diagram that air-conditioning system of the present invention is in main body heating state；；
Fig. 5 is the working principle diagram that air-conditioning system of the present invention is in total heat recovery state；.
Wherein, 1, compressor；2, condenser；3, first throttling device；4, indoor evaporator；5, computer room evaporator；6,
Two throttling sets；7, solenoid valve；8, gas-liquid separator.
Specific embodiment
With reference to the accompanying drawings and examples, specific embodiments of the present invention will be described in further detail.Implement below
Example is not intended to limit the scope of the invention for illustrating the present invention.
In the description of the present invention, it should be noted that unless otherwise indicated, the meaning of " plurality " is two or two with
On；The orientation of the instructions such as term " on ", "lower", "left", "right", "inner", "outside", " front end ", " rear end ", " head ", " tail portion "
Or positional relationship is to be based on the orientation or positional relationship shown in the drawings, and is merely for convenience of description of the present invention and simplification of the description, and
It is not that the device of indication or suggestion meaning or element must have a particular orientation, be constructed and operated in a specific orientation, therefore
It is not considered as limiting the invention.In addition, term " first ", " second ", " third " etc. are used for description purposes only, and cannot
It is interpreted as indication or suggestion relative importance.
In the description of the present invention, it is also necessary to which explanation is unless specifically defined or limited otherwise, term " installation ",
" connected ", " connection " shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or integrally connect
It connects；It can be mechanical connection, be also possible to be electrically connected；It can be directly connected, it can also be indirectly connected through an intermediary.It is right
For those skilled in the art, visual concrete condition understands the concrete meaning of above-mentioned term in the present invention.
Embodiment one:
As shown in Figure 1, the present embodiment discloses a kind of multi-functional multi-connected air conditioning system of three control, this system is by Interior Space
Tune is coupled with air conditioner in machine room, constitutes multi-joint structure, comprising: compressor 1, condenser 2 are carried out for the equipment to computer room or base station
The computer room evaporator 5 persistently to freeze and at least one be used for the indoor evaporator 4 of indoor refrigeration or heating, the interior steaming
Send out device 4, the first end of condenser 2 passes through the valvular branch of two bands and connects respectively with the entrance of the compressor 1, outlet
Logical, the first end of the computer room evaporator 5 is connected to the entrance of the compressor 1, and the first end of the computer room evaporator 5 is equipped with
Second throttling device 6；The indoor evaporator 4, the second end of computer room evaporator 5 are equipped with first throttling device 3, the interior
Evaporator 4, computer room evaporator 5, the second end of condenser 2 are interconnected.
The present invention will be used for the refrigerated air-conditioning system of the multi-connected air conditioning system and computer room or base station of indoor refrigeration or heating
It is coupled together, saves space and equipment, cost greatly reduce；Not only the lasting refrigeration of computer room or base station it had been able to achieve, but also can be with
When adjust the working condition of each indoor evaporator 4, heating, refrigeration, the heating of part refrigerating part may be implemented in each indoor evaporator 4
Etc. functions, meet the needs of different user；Such as when room temperature is lower, and interior needs to heat, all indoor units are all made of heating
Mode, condenser 2 according to circumstances can be freezed or be heated；Under heating mode, when the cooling capacity of indoor heat demand and computer room
When demand reaches balance, condenser 2 can be closed, is only recycled using indoor evaporator 4 and computer room evaporator 5, condenser 2
Fan saves electric energy, realizes energy regenerating, reduce the energy consumption of system under entire air-conditioning without starting.Due to computer room evaporator 5
It is in running order at any time, the problems such as cold-starting is not present when indoor evaporator 4 is opened, lubricates, it is low to also avoid compressor 1
The problem of frequency is run；Under the premise of guaranteeing that computer room evaporator 5 persistently freezes, by adjusting indoor evaporator 4 and condenser 2
Working condition carries out defrosting operation with can be convenient completely, avoids the generation of 4 frost of indoor evaporator.Due to computer room category
In lasting refrigeration, there is special requirement for the evaporating temperature of computer room evaporator 5, therefore is provided with second throttling device 6, so that
Obtaining 5 place pipeline of computer room evaporator has different pressure and evaporating temperature from 4 pipeline of indoor evaporator, guarantees computer room evaporator
5 refrigeration effect.If it is necessary, 5 first end of computer room evaporator can also be changed to distinguish by the branch of two band valves
Entrance, outlet with compressor 1, to facilitate the later period to use or maintenance.
Further, the aperture of the second throttling device 6 is adjustable.That is the pressure and evaporating temperature of computer room evaporator 5
It can be adjusted at any time, to meet the requirement of varying environment, guarantee the refrigeration effect of computer room evaporator 5.
Further, the second end of the computer room evaporator 5 is equipped with the first throttling device 3.The of computer room evaporator 5
One throttling set 3 is matched with the first throttling device 3 of upstream, realizes the purpose of reducing pressure by regulating flow, guarantees computer room evaporator 5
Refrigeration effect.
Further, the first end or second end of the computer room evaporator 5 are equipped with valve.The setting of valve can be in necessity
When disconnect the connection of computer room evaporator 5 and compressor 1, conveniently repair etc. and to operate.
Preferably, the second end of the condenser 2 be equipped with the first throttling device 3, the first throttling device 3 and up and down
The first throttling device 3 of trip matches, and realizes the purpose of reducing pressure by regulating flow.
Preferably, the indoor evaporator 4 is two.Fig. 1 to Fig. 5 be by taking two indoor evaporators 4 as an example, but this
The quantity of an only preferred quantity, indoor evaporator 4 can also be three or more, specifically can according to actual needs into
Row setting, i.e., also belong to protection scope of the present invention using the scheme of the indoor evaporator 4 of other quantity.
Preferably, the valve is solenoid valve 7.Solenoid valve 7 can pass through the remote centralized control of signal, easy switching.
Further, the entrance pipe of the compressor 1 is equipped with gas-liquid separator 8.Gas-liquid separator 8 can prevent liquid
The refrigerant of state enters compressor 1, plays the purpose of protection compressor 1.
Embodiment two:
As shown in Figures 2 to 5, the present embodiment discloses the multi-functional multi-connected air conditioning system of three control described in embodiment one
Control method, by opening or closing each valve to adjust the flow direction of refrigerant, to realize following working condition:
All refrigerating states: as shown in Fig. 2, the refrigerant that the compressor 1 comes out first passes through 2 heat release of condenser, then
Respectively enter the computer room evaporator 5 through the first throttling device 3, each indoor evaporator 4 is freezed, eventually pass back to compress
In machine 1；In summer, indoor evaporator 4 needs to freeze, and when computer room evaporator 5 is also required to refrigeration, air-conditioning system operation at this time is all
Refrigeration mode, the second throttling device 6 of 5 first end of computer room evaporator can control room and realize different evaporation temperature from computer room
Degree, to meet the particular/special requirement of computer room refrigeration.
Main body refrigerating state: as shown in figure 3, the refrigerant that the compressor 1 comes out first passes through condenser 2 and part is indoor
Evaporator 4 carries out heat release, and preceding sections indoor evaporator 4 is heated, and then respectively enters institute through the first throttling device 3
It states computer room evaporator 5, the realization computer room evaporator 5 of remaining indoor evaporator 4 and part indoor evaporator 4 to freeze, eventually pass back to
In compressor 1；When temperature is lower, when indoor evaporator 4 needs to heat, computer room evaporator 5 needs to freeze, and room demand
When heat is less than computer room cooling capacity, system runs main body refrigeration mode；Meanwhile 4 part of indoor evaporator heats, part is freezed, can
To meet the requirement of different constitution crowds simultaneously.
Main body heats state: carrying out as shown in figure 4, the refrigerant that the compressor 1 comes out first passes through each indoor evaporator 4
Then heat release respectively enters the computer room evaporator 5, condenser 2 through the first throttling device 3, eventually passes back to compressor 1
It is interior；When indoor evaporator 4 need heat, computer room evaporator 5 need to freeze when, and room demand heat be greater than computer room cooling capacity when,
System runs main body heating mode, and condenser 2 participates in cooling capacity release process to meet the larger situation of indoor heating demand.
Total heat recovery state: as shown in figure 5, the compressor 1 come out refrigerant first pass through part indoor evaporator 4 into
Then row heat release enters the computer room evaporator 5 through the first throttling device 3, eventually passes back in compressor 1.When indoor steaming
Hair device 4 needs to heat, computer room evaporator 5 is when needing to freeze, and when computer room refrigeration demand is identical with rooms demand, system is transported
Row total heat recovery mode；Actuating section indoor evaporator 4 is only needed to participate in circulation at this time, condenser 2 is not involved in reaction, in the machine of realization
In the case that room refrigeration is heated with indoor section, guarantee that Air-conditioning Cycle is run by way of recycling 5 cooling capacity of computer room evaporator, if
Standby starting amount is less, and electric quantity consumption is few, energy saving.
Further, by adjusting the aperture of the second throttling device 6, obtain indoor evaporator 4 with computer room evaporator 5
Obtain different evaporating temperatures.It can be adjusted at any time in this way, the refrigeration for meeting varying environment temperature machine room lower evaporator 5 is wanted
It asks, guarantees refrigeration effect.
On the whole, the invention has the following advantages that
1, air conditioner in machine room and multi-connected machine are coupled, have not only been able to achieve room refrigeration, heating, but also be able to satisfy computer room, base
The cooling requirement stood；Two sets of air-conditioning systems are combined into a set of, and number of devices greatly reduces, and the space occupied is also reduced significantly, reduce
The equipment cost of cooling and warming；
2, it when computer room refrigeration and room are freezed, due to the requirement of computer room sensible heat ratio, exports and is arranged in computer room evaporator 5
Second throttling device 6 may be implemented the demand of different evaporating temperatures under two kinds of operating conditions, ensure the cooling effect of computer room evaporator 5.
3, computer room evaporator 5 is continuously in operating status, can be to avoid the wind of conventional 1 low-frequency operation of multi-connected machine compressor
The problems such as danger and oil return are difficult.
4, the waste heat of winter recycling computer room is heated, and can defrost problem to avoid frosting.
The above is only a preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, without departing from the technical principles of the invention, several improvement and replacement can also be made, these are improved and replacement
Also it should be regarded as protection scope of the present invention.
Claims (9)
1. a kind of multi-functional multi-connected air conditioning system of three control characterized by comprising compressor, is used for computer room condenser
Or the equipment in base station carries out the computer room evaporator for continuing to freeze and at least one is used for the indoor steaming of indoor refrigeration or heating
Send out device, the indoor evaporator, the first end of condenser pass through the valvular branch of two bands respectively with the compressor
The first end of entrance, outlet, the computer room evaporator is connected to the entrance of the compressor, and the of the computer room evaporator
One end is equipped with second throttling device；The indoor evaporator, the second end of computer room evaporator are equipped with first throttling device, described
Indoor evaporator, computer room evaporator, the second end of condenser are interconnected.
2. air-conditioning system as described in claim 1, which is characterized in that the aperture of the second throttling device is adjustable.
3. air-conditioning system as claimed in claim 2, which is characterized in that the second end of the computer room evaporator is equipped with described first
Throttling set.
4. air-conditioning system as claimed in claim 3, which is characterized in that the first end or second end of the computer room evaporator are equipped with
Valve.
5. air-conditioning system as described in claim 1, which is characterized in that the second end of the condenser is equipped with the first throttle
Device.
6. air-conditioning system as described in claim 1, which is characterized in that the valve is solenoid valve.
7. air-conditioning system as claimed in any one of claims 1 to 6, which is characterized in that the entrance pipe of the compressor is equipped with
Gas-liquid separator.
8. the control method of any one of -7 multi-functional multi-connected air conditioning systems of three control, feature exist according to claim 1
In by opening or closing each valve to adjust the flow direction of refrigerant, to realize following working condition:
All refrigerating states: the refrigerant that the compressor comes out first passes through condenser heat rejection, then fills through the first throttle
It sets and respectively enters the computer room evaporator, each indoor evaporator, eventually pass back in compressor；
Main body refrigerating state: the refrigerant that the compressor comes out first passes through condenser and part indoor evaporator carries out heat release,
Then the computer room evaporator, remaining indoor evaporator are respectively enterd through the first throttling device, eventually passes back to compressor
It is interior；
Main body heats state: the refrigerant that the compressor comes out first passes through each indoor evaporator and carries out heat release, then through described
First throttling device respectively enters the computer room evaporator, condenser, eventually passes back in compressor；
Total heat recovery state: the refrigerant that the compressor comes out first passes through part indoor evaporator and carries out heat release, then through institute
First throttling device is stated into the computer room evaporator, is eventually passed back in compressor.
9. control method as claimed in claim 8, which is characterized in that by adjusting the aperture of the second throttling device, make
Indoor evaporator obtains different evaporating temperatures from computer room evaporator.
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| CN110926072B (en) * | 2019-11-21 | 2021-07-27 | 广东美的暖通设备有限公司 | Multi-split air conditioning system and defrosting control method, control device and storage medium thereof |
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| CN201373632Y (en) * | 2009-02-07 | 2009-12-30 | 广东美的电器股份有限公司 | Multi-connected air-conditioning system |
| CN101644508A (en) * | 2009-06-30 | 2010-02-10 | 广东美的电器股份有限公司 | Multi-connected air conditioner multifunctional system for cold water and hot water |
| CN202835678U (en) * | 2012-09-25 | 2013-03-27 | 广东美的暖通设备有限公司 | Multi-connecting type air conditioning system |
| CN203501354U (en) * | 2013-09-10 | 2014-03-26 | 广东美的暖通设备有限公司 | Multi-connected air-conditioning system |
| CN206235054U (en) * | 2016-10-08 | 2017-06-09 | 广东美的暖通设备有限公司 | A kind of multi-functional multi-connected air conditioning system of three control |
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