CN105910227B - Air-conditioning system and its defrosting method - Google Patents
Air-conditioning system and its defrosting method Download PDFInfo
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- CN105910227B CN105910227B CN201610250932.0A CN201610250932A CN105910227B CN 105910227 B CN105910227 B CN 105910227B CN 201610250932 A CN201610250932 A CN 201610250932A CN 105910227 B CN105910227 B CN 105910227B
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- heat exchanger
- defrost
- conditioning system
- air
- temperature
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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
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
-
- 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
- F24F2110/00—Control inputs relating to air properties
- F24F2110/10—Temperature
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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
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- 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
- F24F11/41—Defrosting; Preventing freezing
Abstract
The invention discloses a kind of air-conditioning system and its defrosting methods, the defrosting method is the following steps are included: when air-conditioning system is run with heating mode, the tube temperature of each heat exchanger is obtained, and is judged in multiple heat exchangers according to the tube temperature of each heat exchanger with the presence or absence of the heat exchanger for needing defrost；If there is the heat exchanger for needing defrost in multiple heat exchangers, current outdoor environment temperature is obtained, and judge whether current outdoor environment temperature is greater than the first preset temperature；When being not necessarily to defrost there are at least one heat exchanger in multiple heat exchangers, if current outdoor environment temperature is greater than the first preset temperature, then control valve corresponding to the heat exchanger of defrost is needed to close to cut off the refrigerant into the heat exchanger for needing defrost, so that outdoor fan carries out heating defrost to the heat exchanger for needing defrost by control.This method can not only remove the frost on heat exchanger, and can guarantee the heating effect of system, to effectively improve the comfort level of user when defrost.
Description
Technical field
The present invention relates to air-conditioning technical field, in particular to the defrosting method of a kind of air-conditioning system and a kind of air-conditioning system
System.
Background technique
Air-conditioning system is in certain temperature range when heating operation, and there are frosts for evaporator, especially in high humility
Under environment, frost is particularly evident.Since evaporimeter frosting influences heat transfer effect, it is therefore desirable to carry out defrost to evaporator.
In the related technology, refrigeration mode is run by control air-conditioning system, so that the tube temperature of evaporator increases, to melt away
Frost on evaporator.Since during defrost, air-conditioning system is run in a chiller mode, user side is no longer heated, thus to
The comfort at family causes to seriously affect.
Summary of the invention
The present invention is directed to solve at least some of the technical problems in related technologies.For this purpose, of the invention
One purpose is to propose a kind of defrosting method of air-conditioning system, can not only remove the frost on heat exchanger, and can guarantee
The heating effect of system, to effectively improve the comfort level of user when defrost.
It is another object of the present invention to propose a kind of air-conditioning system.
To achieve the above object, one aspect of the present invention embodiment proposes a kind of defrosting method of air-conditioning system, the sky
Adjusting system includes outdoor fan and evaporator heat exchange unit, and the evaporator heat exchange unit is made of multiple heat exchanger parallel connections, and
Each heat exchanger in the multiple heat exchanger is also in series with the control valve for controlling refrigerant on-off, the defrosting method packet
It includes following steps: when the air-conditioning system is run with heating mode, obtaining the tube temperature of each heat exchanger, and according to described each
The tube temperature of heat exchanger judges in the multiple heat exchanger with the presence or absence of the heat exchanger for needing defrost；If in the multiple heat exchanger
In the presence of the heat exchanger for needing defrost, then current outdoor environment temperature is obtained, and judges whether the current outdoor environment temperature is big
In the first preset temperature；When being not necessarily to defrost there are at least one heat exchanger in the multiple heat exchanger, if described work as cup
External environment temperature is greater than the first preset temperature, then by control control valve corresponding to the heat exchanger for needing defrost close with
Cutting enter the heat exchanger for needing defrost refrigerant so that the outdoor fan to the heat exchanger for needing defrost into
Row heating defrost.
The defrosting method of air-conditioning system according to an embodiment of the present invention is obtained when air-conditioning system is run with heating mode
The tube temperature of each heat exchanger, and judged in multiple heat exchangers according to the tube temperature of each heat exchanger with the presence or absence of the heat exchange for needing defrost
Device then obtains current outdoor environment temperature if there is the heat exchanger for needing defrost, and whether judges current outdoor environment temperature
Greater than the first preset temperature.If current outdoor environment temperature is greater than the first preset temperature, and exists extremely in multiple heat exchangers
When a few heat exchanger is not necessarily to defrost, control valve corresponding to the heat exchanger of defrost is needed to close by control to cut off to enter and need
The refrigerant of the heat exchanger of defrost is wanted, so that outdoor fan carries out heating defrost to the heat exchanger for needing defrost, thus can not only
The frost on heat exchanger is enough removed, and can guarantee the heating effect of system, the comfort level of user when effectively improving defrost.
According to one embodiment of present invention, when heat exchanger each in the multiple heat exchanger is required to defrost, if
The current outdoor environment temperature is greater than the first preset temperature, also controls at least one in the heat exchanger for needing defrost and exchanges heat
Control valve corresponding to device is kept it turned on, so that at least one described heat exchanger is in heat exchange state.
According to one embodiment of present invention, heating is carried out to the heat exchanger for needing defrost in the outdoor fan
When white, the air-conditioning system is run with heating mode.
According to one embodiment of present invention, the tube temperature according to each heat exchanger judges the multiple heat exchanger
In with the presence or absence of needing the heat exchanger of defrost, comprising: judge whether the tube temperature of each heat exchanger default less than second respectively
Temperature；It is less than second preset temperature if there is the tube temperature of heat exchanger and the duration is greater than the first preset time, then sentences
Break the heat exchanger for existing in the multiple heat exchanger and needing defrost.
According to one embodiment of present invention, first preset temperature is 0 DEG C -0.5 DEG C.
According to one embodiment of present invention, the control valve is electric expansion valve or single-pass solenoid valve.
To achieve the above object, another aspect of the present invention embodiment proposes a kind of air-conditioning system, comprising: outdoor fan；
Evaporator heat exchange unit, the evaporator heat exchange unit are made of multiple heat exchanger parallel connections, and every in the multiple heat exchanger
A heat exchanger is also in series with the control valve for controlling refrigerant on-off, the control module respectively with the outdoor fan and institute
It states evaporator heat exchange unit to be connected, the control module is used for when the air-conditioning system is run with heating mode, is obtained each
The tube temperature of heat exchanger, and judge to whether there is in the multiple heat exchanger according to the tube temperature of each heat exchanger and need defrost
Heat exchanger, and when there is the heat exchanger for needing defrost in the multiple heat exchanger, obtain current outdoor environment temperature, and sentence
Whether the current outdoor environment temperature of breaking is greater than the first preset temperature, and when there are at least one in the multiple heat exchanger
Heat exchanger is not necessarily to defrost, and when the current outdoor environment temperature is greater than the first preset temperature, described needs defrost by controlling
Heat exchanger corresponding to control valve close to cut off the refrigerant into the heat exchanger for needing defrost, so that the outdoor
Blower carries out heating defrost to the heat exchanger for needing defrost.
Air-conditioning system according to an embodiment of the present invention, when air-conditioning system is run with heating mode, control module obtains every
The tube temperature of a heat exchanger, and judged in multiple heat exchangers according to the tube temperature of each heat exchanger with the presence or absence of the heat exchange for needing defrost
Device then obtains current outdoor environment temperature if there is the heat exchanger for needing defrost, and whether judges current outdoor environment temperature
Greater than the first preset temperature.If current outdoor environment temperature is greater than the first preset temperature, and exists extremely in multiple heat exchangers
When a few heat exchanger is not necessarily to defrost, control module needs control valve corresponding to the heat exchanger of defrost to close to cut by control
It is disconnected to enter the refrigerant for needing the heat exchanger of defrost, so that outdoor fan carries out heating defrost to the heat exchanger for needing defrost, from
And the frost on heat exchanger can not only be removed, and can guarantee the heating effect of system, user's relaxes when effectively improving defrost
Appropriateness.
According to one embodiment of present invention, when heat exchanger each in the multiple heat exchanger is required to defrost, if
The current outdoor environment temperature is greater than the first preset temperature, and the control module also controls in the heat exchanger for needing defrost
Control valve corresponding at least one heat exchanger is kept it turned on, so that at least one described heat exchanger is in heat exchange state.
According to one embodiment of present invention, heating is carried out to the heat exchanger for needing defrost in the outdoor fan
When white, the air-conditioning system is run with heating mode.
According to one embodiment of present invention, the control module is according to the judgement of the tube temperature of each heat exchanger
When in multiple heat exchangers with the presence or absence of the heat exchanger for needing defrost, wherein the control module judges each heat exchange respectively
Whether the tube temperature of device is less than the second preset temperature；If there is heat exchanger tube temperature be less than second preset temperature and it is lasting when
Between be greater than the first preset time, the control module, which then judges to exist in the multiple heat exchanger, needs the heat exchanger of defrost.
According to one embodiment of present invention, first preset temperature is 0 DEG C -0.5 DEG C.
According to one embodiment of present invention, the control valve is electric expansion valve or single-pass solenoid valve.
Detailed description of the invention
Fig. 1 is the flow chart of the defrosting method of air-conditioning system according to an embodiment of the present invention.
Fig. 2 is the structural schematic diagram of air-conditioning system according to an embodiment of the invention.
Fig. 3 is the structural schematic diagram of air-conditioning system in accordance with another embodiment of the present invention.
Fig. 4 is the flow chart of the defrosting method of air-conditioning system according to an embodiment of the invention.
Specific embodiment
The embodiment of the present invention is described below in detail, examples of the embodiments are shown in the accompanying drawings, wherein from beginning to end
Same or similar label indicates same or similar element or element with the same or similar functions.Below with reference to attached
The embodiment of figure description is exemplary, it is intended to is used to explain the present invention, and is not considered as limiting the invention.
Defrosting method and the air-conditioning system of the air-conditioning system proposed according to embodiments of the present invention described with reference to the accompanying drawings
System.
Fig. 1 is the flow chart of the defrosting method of air-conditioning system according to an embodiment of the present invention.
In an embodiment of the present invention, air-conditioning system includes outdoor fan and evaporator heat exchange unit, evaporator heat exchange list
Member is made of multiple heat exchanger parallel connections, and each heat exchanger in multiple heat exchangers is also in series with for controlling refrigerant on-off
Control valve.
Specifically, as shown in Figure 2 or Figure 3, air-conditioning system may include compressor 1, main four-way valve 2, outdoor fan 5, section
Flow device 7, condenser 8, gas-liquid separator 9 and evaporator heat exchange unit 10.Wherein, evaporator heat exchange unit 10 is exchanged heat by two-way
Flow path parallel connection is constituted, and a routing First Heat Exchanger 4a and the first control valve 6a is in series, another way by the second heat exchanger 4b and
Second control valve 6b is in series, and the first control valve 6a and the second control valve 6b control the logical of respective place flow path refrigerant respectively
It is disconnected.
As shown in Figure 1, the defrosting method of the air-conditioning system the following steps are included:
S1 obtains the tube temperature of each heat exchanger, and according to each heat exchanger when air-conditioning system is run with heating mode
Tube temperature judges in multiple heat exchangers with the presence or absence of the heat exchanger for needing defrost.
Specifically, as shown in Fig. 2, when air-conditioning system is run with heating mode, the first control valve and the second control valve are equal
It is in the open state, from the refrigerant of the exhaust outlet of compressor out after the first port of main four-way valve and third port, into
Enter condenser, for the refrigerant after heat exchange after throttling set reducing pressure by regulating flow, a part enters the first heat exchange by the first control valve
Device；Another part enters the second heat exchanger by the second control valve, and the refrigerant come out from First Heat Exchanger exchanges heat with from second
After the refrigerant that device comes out converges, gas-liquid separator is entered after the second port of main four-way valve and the 4th port, through gas-liquid point
From the gas returning port for being back to compressor after device separation.That is, refrigerant when air-conditioning system is run with heating mode moves towards are as follows: At this point, in evaporator heat exchange unit
First Heat Exchanger and the second heat exchanger have refrigerant by meeting user's heating needs to exchange heat.
In air-conditioning system obtained in evaporator heat exchange unit in real time by temperature sensor in heating mode operational process
The tube temperature of each heat exchanger, and judged in multiple heat exchangers according to the tube temperature of each heat exchanger with the presence or absence of the heat exchange for needing defrost
Device, that is, judge whether evaporator heat exchange unit needs defrost.
According to one embodiment of present invention, judged in multiple heat exchangers according to the tube temperature of each heat exchanger with the presence or absence of need
Want the heat exchanger of defrost, comprising: judge the tube temperature of each heat exchanger whether less than the second preset temperature respectively；If there is heat exchange
The tube temperature of device is less than the second preset temperature and the duration is greater than the first preset time, then judges there are needs in multiple heat exchangers
The heat exchanger of defrost.Wherein, the second preset temperature and the first preset time can be demarcated according to the actual situation, and the two
It can be automatically adjusted in system operation.
Specifically, as shown in Fig. 2, can be by the tube temperature T1 of temperature sensor real-time detection First Heat Exchanger, and sentence
Whether the tube temperature T1 of disconnected First Heat Exchanger is less than such as 0 DEG C of the second preset temperature, if 0 DEG C of T1 < and duration t1 > first is in advance
If time ts, then judge that First Heat Exchanger needs defrost, meanwhile, the tube temperature T2 of the second heat exchanger is detected by temperature sensor,
Then the tube temperature T2 of the second heat exchanger is judged whether less than 0 DEG C, if 0 DEG C of T2 < and duration t2 > ts, judge second
Heat exchanger needs defrost.As long as there is a heat exchanger to need defrost in First Heat Exchanger and the second heat exchanger, illustrate multiple change
There is the heat exchanger for needing defrost in hot device.
S2 obtains current outdoor environment temperature, and judge if there is the heat exchanger for needing defrost in multiple heat exchangers
Whether current outdoor environment temperature is greater than the first preset temperature.Wherein, the first preset temperature can be 0 DEG C -0.5 DEG C.
S3, when being not necessarily to defrost there are at least one heat exchanger in multiple heat exchangers, if current outdoor environment temperature is big
In the first preset temperature, then control valve corresponding to the heat exchanger of defrost is needed to close by control to cut off to enter and need defrost
Heat exchanger refrigerant so that outdoor fan carries out heating defrost to the heat exchanger for needing defrost.
According to one embodiment of present invention, when heat exchanger each in multiple heat exchangers is required to defrost, if currently
Outdoor environment temperature is greater than the first preset temperature, and also control needs control corresponding at least one heat exchanger in the heat exchanger of defrost
Valve processed is kept it turned on, so that at least one heat exchanger is in heat exchange state.
That is, in an embodiment of the present invention, if there is the heat exchanger for needing defrost in multiple heat exchangers, and
Current outdoor environment temperature is greater than such as 5 DEG C of the first preset temperature, then can be needed corresponding to the heat exchanger of defrost by control
Control valve is closed, to cut off the refrigerant for entering the heat exchanger for needing defrost, so that outdoor fan is to the heat exchanger for needing defrost
Carry out heating defrost.Heat exchanger carry out defrost when, several heat exchangers can simultaneously defrost or the defrost that is staggered, but prohibit
Only all heat exchangers defrost simultaneously.
Specifically, as shown in Fig. 2, needing defrost when First Heat Exchanger, and when the second heat exchanger does not need defrost, control the
One control valve is closed, and is controlled the second control valve and kept it turned on.At this point, passing through in First Heat Exchanger without refrigerant, first
Heat exchanger carries out defrost by the outdoor fan of operating, while refrigerant flows through the second heat exchanger so that system keeps heating function
Energy.When First Heat Exchanger does not need defrost, and the second heat exchanger needs defrost, the second control valve of control is closed, and controls the
One control valve is kept it turned on.At this point, passing through in the second heat exchanger without refrigerant, the outdoor wind that the second heat exchanger passes through operating
Machine carries out defrost, while refrigerant flows through First Heat Exchanger so that system keeps heat-production functions.When First Heat Exchanger and second change
When hot device is required to defrost, defrost first can be carried out to First Heat Exchanger using aforesaid way, be completed in First Heat Exchanger defrost
Afterwards, then to the second heat exchanger defrost is carried out, defrost first can also be carried out to the second heat exchanger, then First Heat Exchanger is carried out again
Defrost.During defrost, needs to guarantee to there is refrigerant to flow through at least one heat exchanger, that is, guarantee at least one heat exchanger
In heat exchange state.
Further, as shown in figure 4, the defrosting method of the air-conditioning system may comprise steps of:
S101, system are run with heating mode, and the first control valve and the second control valve are in open state.
Whether S102 detects the tube temperature T1 of First Heat Exchanger and the tube temperature T2 of the second heat exchanger less than 0 DEG C.If so, holding
Row step S103；If not, continuing to test.
S103, if the tube temperature T1 of First Heat Exchanger less than 0 DEG C, starts timing, timing time t1, if second changes
The tube temperature T2 of hot device then starts timing less than 0 DEG C, and timing time t2 judges whether t1 or t2 reaches the first preset time t s.
If so, executing step S104；If not, continuing to judge.
S104, judges whether current outdoor environment temperature is greater than 5 DEG C.If so, executing step S105；If not, executing
Step S106.
S105, judgement are that t1 reaches ts perhaps t2 reaches ts or t1 and t2 while reaching ts.Reach ts if it is t1,
Then follow the steps S107；If t2 reaches ts, S108 is thened follow the steps；If t1 and t2 reaches ts simultaneously, then follow the steps
S109。
S106, into conventional defrost.That is, still using existing defrost when outdoor unit environment temperature is relatively low
Method carries out defrost to multiple heat exchangers.
S107, First Heat Exchanger enter defrost, and the first control valve of control is closed, and judges that the tube temperature T1 of First Heat Exchanger is
It is no to be greater than Ts DEG C of third preset temperature.If so, executing step S110；If not, continuing defrost.Wherein, third preset temperature
It can be configured according to current outdoor environment temperature.
S108, the second heat exchanger enter defrost, and the second control valve of control is closed, and judges that the tube temperature T2 of the second heat exchanger is
It is no to be greater than Ts DEG C.If so, executing step S111；If not, continuing defrost.
S109, First Heat Exchanger and the second heat exchanger force the defrost that is staggered, and judge whether tube temperature T1, T2 is greater than Ts DEG C.
If T1 is greater than Ts DEG C, S110 is thened follow the steps；If T2 is greater than Ts DEG C, S111 is thened follow the steps.
S110, First Heat Exchanger defrost terminate.
S111, the second heat exchanger defrosting terminate.
When evaporator heat exchange unit includes three heat exchangers, if only having a heat exchanger needs in three heat exchangers
Frost can then be closed by controlling the corresponding control valve of the heat exchanger, so that refrigerant is without the heat exchanger, while be controlled surplus
Remaininging two, not need control valve corresponding to the heat exchanger of defrost in the open state, so that heat exchanger keeps heat exchange shape
State；When needing defrost there are two heat exchangers in three heat exchangers, the two heat exchangers can simultaneously defrost, can also be staggered
Defrost, while guaranteeing that the heat exchanger for not needing defrost keeps heat exchange state；When the heat exchanger in three heat exchangers is required to
When defrost, three heat exchangers can all be staggered defrost, be also possible to two heat exchangers therein defrost simultaneously, as long as guaranteeing it
In a heat exchanger be in heating state.When evaporator heat exchange unit includes three or more heat exchangers, defrost side
Method is identical as three heat exchangers, and I will not elaborate.
In an embodiment of the present invention, when outdoor fan is to needing the heat exchanger of defrost to carry out heating defrost, air-conditioning system
System is run with heating mode.That is, when outdoor environment temperature is at 0 DEG C or more, if evaporator heat exchange unit needs
Frost can then carry out heating defrost, i.e. control air-conditioning system is still run with heating mode, be closed by control control valve, so that
Refrigerant is not passed through one of them or several heat exchangers, while being changed by outdoor fan the heat exchanger that refrigerant does not circulate
Heat heating is to melt the frost on heat exchanger.Exit defrost when the tube temperature of heat exchanger reaches setting value, control control valve open with
Refrigerant is set to circulate.During defrost, the heat exchanger that refrigerant normally circulates can still guarantee system heating operation, therefore to being
The heating effect influence of system is smaller, effectively increases the comfort of user.
In conclusion the defrosting method of air-conditioning system according to an embodiment of the present invention, when air-conditioning system is transported with heating mode
When row, the tube temperature of each heat exchanger is obtained, and judge in multiple heat exchangers with the presence or absence of needs according to the tube temperature of each heat exchanger
The heat exchanger of defrost then obtains current outdoor environment temperature if there is the heat exchanger for needing defrost, and judges current outdoor ring
Whether border temperature is greater than the first preset temperature.If current outdoor environment temperature is greater than the first preset temperature, and multiple heat exchange
In device there are at least one heat exchanger be not necessarily to defrost when, by control need control valve corresponding to the heat exchanger of defrost close with
Cutting enters the refrigerant for needing the heat exchanger of defrost, so that outdoor fan carries out heating defrost to the heat exchanger for needing defrost,
To which the frost on heat exchanger can not only be removed, and it can guarantee the heating effect of system, user when effectively improving defrost
Comfort level.
Fig. 2 is the structural schematic diagram of air-conditioning system according to an embodiment of the invention.As shown in Fig. 2, the air-conditioning system
It include: outdoor fan 5, evaporator heat exchange unit 10 and control module (not specifically illustrated in figure).
Wherein, evaporator heat exchange unit 10 is made of multiple heat exchanger parallel connections, and each heat exchanger in multiple heat exchangers
Also it is in series with the control valve for controlling refrigerant on-off.Wherein, control valve can be electric expansion valve or single-pass solenoid valve.
Specific connection relationship is already described above, this is repeated no more.Control module respectively with outdoor fan 5 and evaporator heat exchange unit 10
It is connected, control module is used for when air-conditioning system is run with heating mode, obtains the tube temperature of each heat exchanger, and change according to each
The tube temperature of hot device judges with the presence or absence of the heat exchanger for needing defrost in multiple heat exchangers, and exists in multiple heat exchangers and need
When the heat exchanger of defrost, current outdoor environment temperature is obtained, and judges whether current outdoor environment temperature is greater than the first default temperature
Degree, and there is at least one heat exchanger in multiple heat exchangers and be not necessarily to defrost, and current outdoor environment temperature is greater than first in advance
If when temperature, needing control valve corresponding to the heat exchanger of defrost to close to cut off into the heat exchanger for needing defrost by controlling
Refrigerant so that 5 pairs of outdoor fan need the heat exchanger of defrost to carry out heating defrost.Wherein, the first preset temperature can be 0
℃-0.5℃。
Specifically, as shown in Fig. 2, when air-conditioning system is run with heating mode, the first control valve 6a and the second control valve
6b is in open state, first port 2a and third of the refrigerant through main four-way valve 2 come out from the exhaust outlet 1a of compressor 1
After the 2c of port, into condenser 8, for the refrigerant after heat exchange after 7 reducing pressure by regulating flow of throttling set, a part passes through the first control valve
6a enters First Heat Exchanger 4a；Another part enters the second heat exchanger 4b by the second control valve 6b, goes out from First Heat Exchanger 4a
Come refrigerant with from the second heat exchanger 4b come out refrigerant converge after, second port 2b and the 4th end through main four-way valve 2
The entrance 9a for entering gas-liquid separator after mouth 2d is back to after the separation of gas-liquid separator 9 from the outlet 9b of gas-liquid separator 9
The gas returning port 1b of compressor 1.That is, refrigerant when air-conditioning system is run with heating mode moves towards are as follows:At this point, evaporator heat exchange unit 10
In First Heat Exchanger 4a and the second heat exchanger 4b have refrigerant by meeting user's heating needs to exchange heat.
In air-conditioning system in heating mode operational process, control module obtains evaporator by temperature sensor in real time and changes
The tube temperature of each heat exchanger in hot cell 10, and judged in multiple heat exchangers according to the tube temperature of each heat exchanger with the presence or absence of needs
The heat exchanger of defrost, that is, judge whether evaporator heat exchange unit 10 needs defrost.
According to one embodiment of present invention, control module judges in multiple heat exchangers according to the tube temperature of each heat exchanger
When with the presence or absence of the heat exchanger for needing defrost, wherein whether control module judges the tube temperature of each heat exchanger less than second respectively
Preset temperature；If there is heat exchanger tube temperature is less than the second preset temperature and the duration is greater than the first preset time, control
Module then judges there is the heat exchanger for needing defrost in multiple heat exchangers.
Specifically, as shown in Fig. 2, control module can pass through the pipe of temperature sensor real-time detection First Heat Exchanger 4a
Warm T1, and the tube temperature T1 of First Heat Exchanger 4a is judged whether less than such as 0 DEG C of the second preset temperature, if 0 DEG C of T1 < and when continuing
Between t1 > the first preset time t s, then judge that First Heat Exchanger 4a needs defrost, meanwhile, control module pass through temperature sensor examine
The tube temperature T2 for surveying the second heat exchanger 4b, then judge the tube temperature T2 of the second heat exchanger 4b whether less than 0 DEG C, if 0 DEG C of T2 < and
Duration t2 > ts then judges that the second heat exchanger 4b needs defrost.As long as having in First Heat Exchanger 4a and the second heat exchanger 4b
One heat exchanger needs defrost, then illustrates there is the heat exchanger for needing defrost in multiple heat exchangers.
According to one embodiment of present invention, when heat exchanger each in multiple heat exchangers is required to defrost, if currently
Outdoor environment temperature is greater than the first preset temperature, and control module, which also controls, needs at least one heat exchanger institute in the heat exchanger of defrost
Corresponding control valve is kept it turned on, so that at least one heat exchanger is in heat exchange state.
That is, in an embodiment of the present invention, if there is the heat exchanger for needing defrost in multiple heat exchangers, and
Current outdoor environment temperature is greater than such as 5 DEG C of the first preset temperature, and control module can then need the heat exchanger of defrost by controlling
Corresponding control valve is closed, to cut off the refrigerant for entering the heat exchanger for needing defrost, so that 5 pairs of outdoor fan need defrost
Heat exchanger carry out heating defrost.Heat exchanger carry out defrost when, several heat exchangers can simultaneously defrost or being staggered
Frost, but forbid the defrost simultaneously of all heat exchangers.
Specifically, as shown in Fig. 2, needing defrost as First Heat Exchanger 4a, and when the second heat exchanger 4b does not need defrost, control
Molding block controls the first control valve 6a and closes, and controls the second control valve 6b and keep it turned on.At this point, in First Heat Exchanger 4a
No refrigerant passes through, and First Heat Exchanger 4a carries out defrost by the outdoor fan 5 of operating, while refrigerant flows through the second heat exchanger
4b is so that system keeps heat-production functions.
When First Heat Exchanger 4a does not need defrost, and the second heat exchanger 4b needs defrost, the second control of control module control
Valve 6b processed is closed, and is controlled the first control valve 6a and kept it turned on.At this point, pass through in the second heat exchanger 4b without refrigerant, the
Two heat exchanger 4b carry out defrost by the outdoor fan 5 of operating, while refrigerant flows through First Heat Exchanger 4a so that system is kept
Heat-production functions.
When First Heat Exchanger 4a and the second heat exchanger 4b are required to defrost, control module can be first right using aforesaid way
First Heat Exchanger 4a carries out defrost, carries out defrost after the completion of First Heat Exchanger 4a defrost, then to the second heat exchanger 4b, can also be with
Defrost first is carried out to the second heat exchanger 4b, defrost then is carried out to First Heat Exchanger 4a again.During defrost, need to guarantee extremely
There is refrigerant to flow through in a few heat exchanger, that is, guarantees that at least one heat exchanger is in heat exchange state.
When evaporator heat exchange unit includes three heat exchangers, if only having a heat exchanger needs in three heat exchangers
Frost, control module can then be closed by controlling the corresponding control valve of the heat exchanger, so that refrigerant is without the heat exchanger, together
When control remaining two not need control valve corresponding to the heat exchanger of defrost in the open state so that heat exchanger is kept
Heat exchange state；When needing defrost there are two heat exchangers in three heat exchangers, control module can control the two heat exchangers
Defrost simultaneously, can also be staggered defrost, while guarantee that the heat exchanger for not needing defrost keeps heat exchange state；It exchanges heat when three
When heat exchanger in device is required to defrost, control module can control three heat exchangers and all be staggered defrost, also can control it
In two heat exchangers simultaneously defrost, as long as guaranteeing that one of heat exchanger is in heating state.
When evaporator heat exchange unit includes three or more heat exchangers, defrosting method is identical as three heat exchangers,
I will not elaborate.
In an embodiment of the present invention, when 5 pairs of outdoor fan need the heat exchanger of defrost to carry out heating defrost, air-conditioning system
System is run with heating mode.That is, when outdoor environment temperature is at 0 DEG C or more, if evaporator heat exchange unit 10 needs
Defrost can then carry out heating defrost, i.e. control module control air-conditioning system is still run with heating mode, by controlling control valve
It closes, so that refrigerant is not passed through one of them or several heat exchangers, while being changed by outdoor fan 5 what refrigerant did not circulated
Hot device carries out heat exchange heating to melt the frost on heat exchanger.Defrost is exited when the tube temperature of heat exchanger reaches setting value, controls mould
Block controls control valve and opens so that refrigerant circulates.During defrost, the heat exchanger that refrigerant normally circulates can still guarantee be
System heating operation, thus it is smaller on the influence of the heating effect of system, effectively increase the comfort of user.
Air-conditioning system according to an embodiment of the present invention, when air-conditioning system is run with heating mode, control module obtains every
The tube temperature of a heat exchanger, and judged in multiple heat exchangers according to the tube temperature of each heat exchanger with the presence or absence of the heat exchange for needing defrost
Device then obtains current outdoor environment temperature if there is the heat exchanger for needing defrost, and whether judges current outdoor environment temperature
Greater than the first preset temperature.If current outdoor environment temperature is greater than the first preset temperature, and exists extremely in multiple heat exchangers
When a few heat exchanger is not necessarily to defrost, control module needs control valve corresponding to the heat exchanger of defrost to close to cut by control
It is disconnected to enter the refrigerant for needing the heat exchanger of defrost, so that outdoor fan carries out heating defrost to the heat exchanger for needing defrost, from
And the frost on heat exchanger can not only be removed, and can guarantee the heating effect of system, user's relaxes when effectively improving defrost
Appropriateness.
In the description of the present invention, it is to be understood that, term " first ", " second " are used for description purposes only, and cannot
It is interpreted as indication or suggestion relative importance or implicitly indicates the quantity of indicated technical characteristic.Define as a result, " the
One ", the feature of " second " can explicitly or implicitly include at least one of the features.In the description of the present invention, " multiple "
It is meant that at least two, such as two, three etc., unless otherwise specifically defined.
In the present invention unless specifically defined or limited otherwise, term " installation ", " connected ", " connection ", " fixation " etc.
Term shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or integral；It can be mechanical connect
It connects, is also possible to be electrically connected；It can be directly connected, can also can be in two elements indirectly connected through an intermediary
The interaction relationship of the connection in portion or two elements, unless otherwise restricted clearly.For those of ordinary skill in the art
For, the specific meanings of the above terms in the present invention can be understood according to specific conditions.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show
The description of example " or " some examples " etc. means specific features, structure, material or spy described in conjunction with this embodiment or example
Point is included at least one embodiment or example of the invention.In the present specification, schematic expression of the above terms are not
It must be directed to identical embodiment or example.Moreover, particular features, structures, materials, or characteristics described can be in office
It can be combined in any suitable manner in one or more embodiment or examples.In addition, without conflicting with each other, the skill of this field
Art personnel can tie the feature of different embodiments or examples described in this specification and different embodiments or examples
It closes and combines.
Although the embodiments of the present invention has been shown and described above, it is to be understood that above-described embodiment is example
Property, it is not considered as limiting the invention, those skilled in the art within the scope of the invention can be to above-mentioned
Embodiment is changed, modifies, replacement and variant.
Claims (12)
1. a kind of defrosting method of air-conditioning system, which is characterized in that the air-conditioning system includes outdoor fan and evaporator heat exchange
Unit, the evaporator heat exchange unit are made of multiple heat exchanger parallel connections, and each heat exchanger in the multiple heat exchanger is also
Be in series with the control valve for controlling refrigerant on-off, the defrosting method the following steps are included:
When the air-conditioning system is run with heating mode, the tube temperature of each heat exchanger is obtained, and according to each heat exchanger
Tube temperature judge in the multiple heat exchanger with the presence or absence of needing the heat exchanger of defrost；
If there is the heat exchanger for needing defrost in the multiple heat exchanger, current outdoor environment temperature is obtained, and judge institute
State whether current outdoor environment temperature is greater than the first preset temperature；
When being not necessarily to defrost there are at least one heat exchanger in the multiple heat exchanger, if the current outdoor environment temperature is big
In the first preset temperature, then closed by controlling control valve corresponding to the heat exchanger for needing defrost to cut off described in entrance
The refrigerant of the heat exchanger of defrost is needed, so that the outdoor fan carries out heating defrost to the heat exchanger for needing defrost.
2. the defrosting method of air-conditioning system according to claim 1, which is characterized in that when each in the multiple heat exchanger
When heat exchanger is required to defrost, if the current outdoor environment temperature is greater than the first preset temperature, the needs is also controlled
Control valve corresponding at least one heat exchanger is kept it turned in the heat exchanger of frost, so that at least one described heat exchanger
In heat exchange state.
3. the defrosting method of air-conditioning system according to claim 1 or 2, which is characterized in that in the outdoor fan to institute
It states when the heat exchanger of defrost being needed to carry out heating defrost, the air-conditioning system is run with heating mode.
4. the defrosting method of air-conditioning system according to claim 1, which is characterized in that described according to each heat exchanger
Tube temperature judge in the multiple heat exchanger with the presence or absence of needing the heat exchanger of defrost, comprising:
Judge the tube temperature of each heat exchanger whether less than the second preset temperature respectively；
It is less than second preset temperature if there is the tube temperature of heat exchanger and the duration is greater than the first preset time, then judges
There is the heat exchanger for needing defrost in the multiple heat exchanger.
5. the defrosting method of air-conditioning system according to claim 1, which is characterized in that first preset temperature be 0 DEG C-
0.5℃。
6. the defrosting method of air-conditioning system according to claim 1, which is characterized in that the control valve is electric expansion valve
Or single-pass solenoid valve.
7. a kind of air-conditioning system characterized by comprising
Outdoor fan；
Evaporator heat exchange unit, the evaporator heat exchange unit are made of multiple heat exchanger parallel connections, and in the multiple heat exchanger
Each heat exchanger be also in series with the control valve for controlling refrigerant on-off；
Control module, the control module are connected with the outdoor fan and the evaporator heat exchange unit respectively, the control
Module is used for when the air-conditioning system is run with heating mode, obtains the tube temperature of each heat exchanger, and each change according to described
The tube temperature of hot device judges with the presence or absence of the heat exchanger for needing defrost in the multiple heat exchanger, and in the multiple heat exchanger
When in the presence of the heat exchanger for needing defrost, current outdoor environment temperature is obtained, and judge whether the current outdoor environment temperature is big
In the first preset temperature, and there is at least one heat exchanger in the multiple heat exchanger without defrost, and described works as cup
When external environment temperature is greater than the first preset temperature, by control control valve corresponding to the heat exchanger for needing defrost close with
Cutting enter the heat exchanger for needing defrost refrigerant so that the outdoor fan to the heat exchanger for needing defrost into
Row heating defrost.
8. air-conditioning system according to claim 7, which is characterized in that when heat exchanger each in the multiple heat exchanger is both needed to
When wanting defrost, if the current outdoor environment temperature is greater than the first preset temperature, the control module also controls the needs
Control valve corresponding at least one heat exchanger is kept it turned in the heat exchanger of defrost, so that at least one described heat exchanger
In heat exchange state.
9. air-conditioning system according to claim 7 or 8, which is characterized in that need defrost to described in the outdoor fan
Heat exchanger when carrying out heating defrost, the air-conditioning system is run with heating mode.
10. air-conditioning system according to claim 7, which is characterized in that the control module is according to each heat exchange
When the tube temperature of device judges in the multiple heat exchanger with the presence or absence of the heat exchanger for needing defrost, wherein
Whether the control module judges the tube temperature of each heat exchanger less than the second preset temperature respectively；
It is less than second preset temperature if there is the tube temperature of heat exchanger and the duration is greater than the first preset time, the control
Molding block then judges there is the heat exchanger for needing defrost in the multiple heat exchanger.
11. air-conditioning system according to claim 7, which is characterized in that first preset temperature is 0 DEG C -0.5 DEG C.
12. air-conditioning system according to claim 7, which is characterized in that the control valve is electric expansion valve or single-pass
Solenoid valve.
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| CN106403422B (en) * | 2016-09-21 | 2019-03-01 | 广东工业大学 | A kind of polycyclic pipeline heat exchanger defrosting starting point determination method of air source heat pump and system |
| CN106352417A (en) * | 2016-10-26 | 2017-01-25 | 广东美的制冷设备有限公司 | Heat accumulation and defrosting air-conditioning system and control method thereof |
| CN106524399A (en) * | 2016-10-31 | 2017-03-22 | 芜湖美智空调设备有限公司 | Air conditioner defrosting device, air conditioner defrosting control method and system and air conditioner |
| CN106871477A (en) * | 2017-03-13 | 2017-06-20 | 合肥美的暖通设备有限公司 | Defroster, source pump and its Defrost method |
| CN107504746A (en) * | 2017-08-22 | 2017-12-22 | 广东美的暖通设备有限公司 | Heat pump components, defrosting control method and storage medium |
| CN108759261B (en) * | 2018-07-18 | 2019-09-27 | 中国人民解放军国防科技大学 | Parallel precooler and deicing method thereof |
| CN108917219A (en) * | 2018-07-19 | 2018-11-30 | 广东芬尼克兹节能设备有限公司 | Heat pump unit removes defrosting system and its Defrost method |
| CN109458697B (en) * | 2018-10-31 | 2020-03-17 | 珠海格力电器股份有限公司 | Defrosting control method, device and system for heat exchange equipment |
| CN109373514B (en) * | 2018-11-19 | 2021-07-23 | 青岛海尔空调电子有限公司 | Defrosting control method for outdoor unit of air conditioner |
| CN113366272A (en) * | 2019-01-22 | 2021-09-07 | 北京卡林新能源技术有限公司 | Wet air heat exchanger wheel-driven defrosting control system |
| CN114608212A (en) * | 2022-02-25 | 2022-06-10 | 南通亚泰工程技术有限公司 | Cascade refrigerating plant |
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