CN115059984A - Air conditioner and control method thereof - Google Patents
Air conditioner and control method thereof Download PDFInfo
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- CN115059984A CN115059984A CN202210765403.XA CN202210765403A CN115059984A CN 115059984 A CN115059984 A CN 115059984A CN 202210765403 A CN202210765403 A CN 202210765403A CN 115059984 A CN115059984 A CN 115059984A
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- 238000000034 method Methods 0.000 title claims abstract description 37
- 230000008014 freezing Effects 0.000 claims abstract description 133
- 238000007710 freezing Methods 0.000 claims abstract description 133
- 238000010438 heat treatment Methods 0.000 claims abstract description 51
- 239000003507 refrigerant Substances 0.000 claims description 30
- 230000001276 controlling effect Effects 0.000 claims description 13
- 230000001105 regulatory effect Effects 0.000 claims description 10
- 238000010257 thawing Methods 0.000 abstract description 8
- 238000013459 approach Methods 0.000 abstract 1
- 238000010521 absorption reaction Methods 0.000 description 20
- 230000006872 improvement Effects 0.000 description 8
- 230000008569 process Effects 0.000 description 8
- 230000005494 condensation Effects 0.000 description 6
- 238000009833 condensation Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- 238000005057 refrigeration Methods 0.000 description 5
- 238000007791 dehumidification Methods 0.000 description 4
- 230000008023 solidification Effects 0.000 description 4
- 238000007711 solidification Methods 0.000 description 4
- 238000004378 air conditioning Methods 0.000 description 3
- 230000001143 conditioned effect Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000007791 liquid phase Substances 0.000 description 3
- 238000001816 cooling Methods 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 2
- 230000008020 evaporation Effects 0.000 description 2
- 238000001704 evaporation Methods 0.000 description 2
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000012071 phase Substances 0.000 description 1
- 238000013517 stratification Methods 0.000 description 1
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Classifications
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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
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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
- F24F11/46—Improving electric energy efficiency or saving
-
- 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
- F24F11/49—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring ensuring correct operation, e.g. by trial operation or configuration checks
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention discloses an air conditioner and a control method thereof, when the temperature of an outdoor coil pipe for heating in winter approaches the outdoor freezing point temperature, the temperature of the coil pipe of two outdoor heat exchangers is respectively divided into temperature layers above and below the freezing point without frosting by controlling the coil pipe arranged in the two outdoor heat exchangers, the frosting difficulty and the comprehensive heating efficiency of the outdoor unit are improved, the low-temperature use range of the heating in winter of the air conditioner is enlarged, and the problem that the outdoor unit is easy to frost in the heating in winter of the current air conditioner is solved. In addition, because frosting does not occur, the problem of indoor no heat output and time consumption during defrosting do not exist, heat can be stably output to the indoor, the stability of indoor temperature is ensured, the comfort experience of a user is improved, and the problem that the indoor temperature is unstable due to frosting of the outdoor unit for heating in winter of the current air conditioner is solved.
Description
Technical Field
The invention relates to the technical field of air conditioners, in particular to an air conditioner and a control method thereof.
Background
Winter is when outdoor ambient temperature is lower, the air conditioner is at the long-time operation in-process that heats, the coil pipe temperature of the outdoor heat exchanger of air conditioner reaches or is less than outdoor freezing point temperature at that time, outdoor coil pipe begins to frost and leads to heating the effect and descend, and along with the increase of frosting time, frosting can be more and more serious, frost layer can increase heat transfer resistance, can lead to outdoor flow area to reduce simultaneously, the flow resistance grow, the amount of wind reduces, make outdoor heat exchanger temperature further descend, the heat transfer variation, indoor heat supply is not enough, reduce indoor environment travelling comfort, can't satisfy the demand that the user heated. Therefore, after the outdoor heat exchanger of the air conditioner is frosted, the outdoor heat exchanger of the air conditioner needs to be defrosted, but in the defrosting process, heat cannot be supplied to the indoor space, so that the indoor heat supply is temporarily stopped, and the stability of the heating temperature of a user and the user experience cannot be met.
Disclosure of Invention
The embodiment of the invention aims to provide an air conditioner and a control method thereof, when the temperature of an outdoor coil of a heating room in winter is close to the outdoor freezing point temperature, the temperature of the coils of two outdoor heat exchangers is divided into upper and lower temperature layers at the freezing point without frosting, the frosting difficulty and the comprehensive heating efficiency of an outdoor unit are improved, the low-temperature use range of heating in winter of the air conditioner is expanded, and the problem that the outdoor unit of the heating room in winter of the air conditioner is easy to frost at present is solved.
To achieve the above object, an embodiment of the present invention provides an air conditioner, including:
an indoor unit for adjusting the temperature and humidity of indoor air;
the outdoor unit is connected with the indoor unit through an on-line pipe, and is provided with a first outdoor heat exchanger, a second outdoor heat exchanger and an outdoor throttling device, wherein the first outdoor heat exchanger and the second outdoor heat exchanger are used for carrying out heat exchange with outside air, and the outdoor throttling device is arranged between the first outdoor heat exchanger and the second outdoor heat exchanger and is used for regulating the flow of a refrigerant flowing into the second outdoor heat exchanger from the first outdoor heat exchanger;
the controller is used for calculating the first freezing point temperature of the first outdoor heat exchanger when the air conditioner is in a heating mode; acquiring a first coil temperature of a first outdoor heat exchanger, and when the first coil temperature is less than or equal to the first freezing point temperature, reducing the opening degree of the outdoor throttling device until the first coil temperature is greater than the first freezing point temperature; the outdoor throttling device is in a full-open state by default when the air conditioner is started.
As an improvement of the above solution, the outdoor unit further includes:
the first temperature and humidity sensor is arranged outside the first outdoor heat exchanger and used for detecting the temperature and the humidity of air passing through the first outdoor heat exchanger;
the controller is further configured to:
acquiring dry bulb humidity and relative humidity of air flowing through the first outdoor heat exchanger, and calculating a first dew point temperature of the first outdoor heat exchanger according to the dry bulb humidity and the relative humidity; wherein the first dew point temperature is greater than the first freezing point temperature;
and when the first coil pipe temperature is lower than the first dew point temperature and higher than the first freezing point temperature, controlling the outdoor throttling device to be kept in a fully open state.
As an improvement of the above, the controller is further configured to:
the method comprises the steps of obtaining a first current temperature and a first current humidity of detected air flowing through a first outdoor heat exchanger, searching a first target temperature corresponding to the first current temperature and the first current humidity in a preset freezing temperature lookup table according to the first current temperature and the first current humidity, and taking the first target temperature as a first freezing point temperature of the first outdoor heat exchanger.
As an improvement of the above, the outdoor unit further includes:
an outdoor throttle valve provided between the first outdoor heat exchanger and the indoor heat exchanger for regulating a flow rate of the refrigerant flowing from the indoor heat exchanger into the first outdoor heat exchanger; the outdoor throttle valve adjusts the opening degree of the outdoor throttle valve according to the superheat degree of return air when the outdoor throttle device is in a full-open state;
the controller is further configured to:
after the opening degree of the outdoor throttling device is reduced, calculating a second freezing point temperature of the second outdoor heat exchanger;
and acquiring a second coil temperature of the second outdoor heat exchanger, and when the second coil temperature is less than or equal to the second freezing point temperature, increasing the opening degree of the outdoor throttle valve until the second coil temperature is greater than the second freezing point temperature.
As an improvement of the above, the outdoor unit further includes:
the second temperature and humidity sensor is arranged outside the second outdoor heat exchanger and used for detecting the temperature and the humidity of the air passing through the second outdoor heat exchanger;
the controller is further configured to:
and acquiring a second current temperature and a second current humidity of the detected air flowing through the second outdoor heat exchanger, searching a first target temperature corresponding to the second current temperature and the second current humidity in a preset freezing temperature lookup table according to the second current temperature and the second current humidity, and taking the second target temperature as a second freezing point temperature of the second outdoor heat exchanger.
In order to achieve the above object, an embodiment of the present invention further provides an air conditioner control method, where an outdoor unit of the air conditioner is provided with a first outdoor heat exchanger and a second outdoor heat exchanger for exchanging heat with outside air, and an outdoor throttling device arranged between the first outdoor heat exchanger and the second outdoor heat exchanger, where the outdoor throttling device is used to regulate a flow rate of refrigerant flowing from the first outdoor heat exchanger into the second outdoor heat exchanger; the air conditioner control method includes:
calculating a first freezing point temperature of a first outdoor heat exchanger when the air conditioner is in a heating mode;
acquiring a first coil temperature of a first outdoor heat exchanger;
when the first coil pipe temperature is less than or equal to the first freezing point temperature, the opening degree of the outdoor throttling device is reduced until the first coil pipe temperature is greater than the first freezing point temperature; the outdoor throttling device is in a full-open state by default when the air conditioner is started.
As an improvement of the above aspect, the air conditioner control method further includes:
acquiring the dry bulb humidity and the relative humidity of the air flowing through the first outdoor heat exchanger;
calculating a first dew point temperature of the first outdoor heat exchanger according to the dry-bulb humidity and the relative humidity; wherein the first dew point temperature is greater than the first freezing point temperature;
and when the first coil pipe temperature is lower than the first dew point temperature and higher than the first freezing point temperature, controlling the outdoor throttling device to be kept in a fully open state.
As an improvement of the above, the calculating the first freezing point temperature of the first outdoor heat exchanger includes:
acquiring a first current temperature and a first current humidity of the detected air flowing through the first outdoor heat exchanger;
and searching a first target temperature corresponding to the first current temperature and the first current humidity in a preset freezing temperature lookup table according to the first current temperature and the first current humidity, and taking the first target temperature as the first freezing point temperature of the first outdoor heat exchanger.
As an improvement of the above solution, the outdoor unit further includes an outdoor throttle valve disposed between the first outdoor heat exchanger and the indoor heat exchanger, the outdoor throttle valve is configured to regulate a flow rate of the refrigerant flowing from the indoor heat exchanger into the first outdoor heat exchanger, and the outdoor throttle valve regulates its opening degree according to a return air superheat degree when the outdoor throttle device is in a fully open state; then, the air conditioner control method further includes:
after the opening degree of the outdoor throttling device is reduced, calculating a second freezing point temperature of the second outdoor heat exchanger;
acquiring a second coil temperature of the second outdoor heat exchanger;
and when the temperature of the second coil is less than or equal to the second freezing point temperature, the opening degree of the outdoor throttle valve is increased until the temperature of the second coil is greater than the second freezing point temperature.
As an improvement of the above, the calculating the second freezing point temperature of the second outdoor heat exchanger includes:
acquiring a second current temperature and a second current humidity of the detected air flowing through the second outdoor heat exchanger;
and searching a first target temperature corresponding to the second current temperature and the second current humidity in a preset freezing temperature lookup table according to the second current temperature and the second current humidity, and taking the second target temperature as a second freezing point temperature of the second outdoor heat exchanger.
Compared with the prior art, the air conditioner and the control method thereof disclosed by the embodiment of the invention have the advantages that when the temperature of the outdoor coil of the heating machine is close to the outdoor freezing point temperature in winter, the temperature of the coil of the two outdoor heat exchangers is divided into the upper temperature layer and the lower temperature layer without frosting by controlling the coil of the two outdoor heat exchangers, the frosting difficulty and the comprehensive heating efficiency of the outdoor machine are improved, the low-temperature use range of the air conditioner for heating in winter is expanded, and the problem that the outdoor machine of the air conditioner for heating in winter is easy to frost at present is solved. In addition, because the frosting does not occur, the problems of indoor no heat output and time consumption during defrosting do not exist, heat can be stably output to the indoor, the stability of the indoor temperature is ensured, the comfort experience of a user is improved, and the problem that the indoor temperature is unstable due to frosting of the outdoor unit for heating of the air conditioner in winter at present is solved.
Drawings
Fig. 1 is a schematic structural diagram of an air conditioner according to an embodiment of the present invention;
FIG. 2 is a schematic view showing the construction of a refrigerating system of a conventional air conditioner;
fig. 3 is a schematic structural diagram of a refrigeration system of an air conditioner according to an embodiment of the present invention;
fig. 4 is a first flowchart of a controller of an air conditioner according to an embodiment of the present invention;
fig. 5 is a second flowchart of the operation of a controller in an air conditioner according to an embodiment of the present invention;
fig. 6 is a third flowchart illustrating operation of a controller in an air conditioner according to an embodiment of the present invention;
fig. 7 is a fourth operation flowchart of the controller in the air conditioner according to the embodiment of the present invention;
fig. 8 is a fifth flowchart illustrating operation of a controller in an air conditioner according to an embodiment of the present invention;
FIG. 9 is a heat quantity comparison graph of the operation of the conventional air conditioner and the air conditioner set according to the embodiment of the present invention;
fig. 10 is a flowchart of an air conditioner control method according to an embodiment of the present invention.
100, an indoor unit; 200. an outdoor unit; 11. a conventional air-conditioning indoor heat exchanger; 12. a conventional air conditioning compressor; 13. a conventional air conditioner outdoor heat exchanger; 14. a conventional air conditioning throttle valve; 101. an indoor heat exchanger; 102. an indoor fan; 201. an outdoor throttle valve; 202. a first outdoor heat exchanger; 203. an outdoor throttling device; 204. a second outdoor heat exchanger; 205. a compressor; 206. an outdoor fan; 207. a first coil bulb; 208. a first temperature and humidity sensor; 209. a second temperature and humidity sensor; 210. the second coil pipe thermal bulb.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present application, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the present application and simplifying the description, but do not indicate or imply that the referred device or element must have a particular orientation, be constructed in a particular orientation, and be operated, and thus should not be construed as limiting the present application.
The terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or to implicitly indicate the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, the meaning of "a plurality" is two or more unless otherwise specified.
In the description of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.
Referring to fig. 1, fig. 1 is a schematic structural diagram of an air conditioner according to an embodiment of the present invention, where the air conditioner includes at least an indoor unit 100 and an outdoor unit 200. The indoor unit 100 is used to adjust the temperature and humidity of indoor air, the outdoor unit 200 is connected to the indoor unit 100 through a connecting pipe, the outdoor unit 200 is installed outdoors, and the indoor unit 100 is installed indoors.
Referring to fig. 2, fig. 2 is a schematic structural view of a refrigeration system of a conventional air conditioner including a conventional air conditioner indoor heat exchanger 11, a conventional air conditioner compressor 12, a conventional air conditioner outdoor heat exchanger 13, and a conventional air conditioner throttle valve 14. When the outdoor environment temperature is lower in winter, the outdoor coil pipe begins to frost to lead to the heating effect to descend, therefore the outdoor heat exchanger of air conditioner need defrost after frosting, but at the in-process of defrosting, can't provide heat to indoor for indoor heat supply appears and stops temporarily, can't satisfy user heating temperature's stability and user and use and experience.
Referring to fig. 3, fig. 3 is a schematic structural diagram of a refrigeration system of an air conditioner according to an embodiment of the present invention, where the air conditioner includes an indoor heat exchanger 101, an indoor fan 102, an outdoor throttle valve 201, a first outdoor heat exchanger 202, an outdoor throttle device 203, a second outdoor heat exchanger 204, a compressor 205, an outdoor fan 206, a first coil temperature sensing package 207, a first temperature and humidity sensor 208, a second temperature and humidity sensor 209, and a second coil temperature sensing package 210.
Compared with the conventional air conditioner shown in fig. 2, the air conditioner according to the embodiment of the present invention has two heat exchangers in the outdoor unit 200, namely, the first outdoor heat exchanger 202 and the second outdoor heat exchanger 204, and an outdoor throttling device 203 is disposed between the first outdoor heat exchanger 202 and the second outdoor heat exchanger 204, wherein the outdoor throttling device 203 is used for regulating the flow rate of the refrigerant flowing from the first outdoor heat exchanger 202 into the second outdoor heat exchanger 204, and the outdoor throttling device 203 is in a full-on state by default when the air conditioner is started. Through write in control logic in the controller of air conditioner, can realize according to external environment right outdoor throttling arrangement 203's aperture adjustment for the coil pipe temperature of two outdoor heat exchangers is the temperature stratification about the freezing point respectively and is not frosted, has improved the degree of difficulty and the comprehensive efficiency of heating that the off-premises station frosted, has enlarged the low temperature application range that the air conditioner heats in winter, solves the problem that current air conditioner heats outdoor unit easily frosting in winter.
In the embodiment of the present invention, the first outdoor heat exchanger 202, the second outdoor heat exchanger 204 and the outdoor fan 206 are arranged in parallel along the circulating air, and the outdoor throttling device 203 is interposed between the first outdoor heat exchanger 202 and the second outdoor heat exchanger 204 and constitutes an outdoor coil. From the structural composition, the method can be simply seen as that a throttling device is additionally arranged at the only connecting part of the two rows of heat exchangers of the original two rows of outdoor coils, so that the original outdoor heat exchanger is divided into two parts, and the two parts are changed into the first outdoor heat exchanger 202 and the second outdoor heat exchanger 204.
In an embodiment of the present invention, a refrigeration cycle of the air conditioner includes a series of processes involving compression, condensation, expansion, and evaporation, and supplies refrigerant to the air that has been conditioned and heat-exchanged. The compressor 205 compresses refrigerant gas in a high-temperature and high-pressure state and discharges the compressed refrigerant gas, the discharged refrigerant gas flows into the first and second outdoor heat exchangers 202 and 204, the compressed refrigerant is condensed into a liquid phase, and heat is released to the surrounding environment through a condensation process, an expansion valve (not shown) expands the liquid phase refrigerant in the high-temperature and high-pressure state condensed in the first and second outdoor heat exchangers 202 and 204 into low-pressure liquid phase refrigerant, the first and second outdoor heat exchangers 202 and 204 evaporate the refrigerant expanded in the expansion valve, and return the refrigerant gas in a low-temperature and low-pressure state to the compressor 205.
In the embodiment of the present invention, the indoor heat exchanger 101 may achieve a cooling effect by heat-exchanging latent heat of evaporation of a refrigerant with a material to be cooled, and the air conditioner may adjust the temperature of an indoor space throughout a cycle. The outdoor unit of the air conditioner refers to a portion of the refrigeration cycle including the compressor 205, the first outdoor heat exchanger 202, and the second outdoor heat exchanger 204, the indoor unit of the air conditioner includes the indoor heat exchanger 101, and the expansion valve may be provided in the indoor unit or the outdoor unit. When the air conditioner is in a cooling mode, the indoor heat exchanger 101 functions as an evaporator, and the first and second outdoor heat exchangers 202 and 204 function as condensers; when the air conditioner is in a heating mode, the first outdoor heat exchanger 202 and the second outdoor heat exchanger 204 function as evaporators, and the indoor heat exchanger 101 functions as a condenser.
In the embodiment of the present invention, the indoor fan 102 is located at a substantially central portion of the inside of the casing of the indoor unit 100, and by rotationally driving the indoor fan 102, the conditioned air generated by the indoor heat exchanger 101 after the indoor air is sucked from the air inlet and passed through the air filter is blown out from the air outlet to the room. The greater the rotation speed of the indoor fan 102 is, the greater the amount of conditioned air blown out from the outlet. The outdoor fan 206 is the same.
In an embodiment of the present invention, the outdoor unit further includes: an outdoor throttle valve 201, disposed between the first outdoor heat exchanger 202 and the indoor heat exchanger 101, for regulating the flow rate of the refrigerant flowing from the indoor heat exchanger 101 into the first outdoor heat exchanger 202; wherein, the outdoor throttle valve 201 adjusts the opening degree thereof according to the return air superheat degree when the outdoor throttle device 203 is in the full-open state.
In an embodiment of the present invention, the outdoor unit further includes:
a first temperature and humidity sensor 208, disposed outside the first outdoor heat exchanger 202, for detecting the temperature and humidity of the air passing through the first outdoor heat exchanger 202;
a second temperature and humidity sensor 209, disposed outside the second outdoor heat exchanger 204, for detecting a temperature and a humidity of the air passing through the second outdoor heat exchanger 204;
a first coil thermal bulb 207, disposed on the coil of the first outdoor heat exchanger 202, for detecting a first coil temperature of the first outdoor heat exchanger 202;
and the second coil thermal bulb 210 is arranged on the coil of the second outdoor heat exchanger 204 and used for detecting the second coil temperature of the second outdoor heat exchanger 204.
Specifically, the controller of the air conditioner is configured to: calculating a first freezing point temperature of the first outdoor heat exchanger 202 when the air conditioner is in a heating mode; acquiring a first coil temperature of a first outdoor heat exchanger 202, and when the first coil temperature is less than or equal to the first freezing point temperature, reducing the opening degree of the outdoor throttling device 203 until the first coil temperature is greater than the first freezing point temperature; wherein the outdoor throttling device 203 is in a full-open state by default when the air conditioner is started.
It should be noted that, in winter, the air conditioner operates to heat with a low outdoor ambient temperature, the compressor operates according to the free frequency of the difference relationship between the indoor target temperature and the indoor actual temperature, the outdoor throttle device 203 is fully opened by default, and the opening of the outdoor throttle valve is adjusted according to the superheat degree of return air when the outdoor throttle device 203 is fully opened. When the first coil temperature of the first outdoor heat exchanger 202 is less than or equal to the current outdoor ambient temperature, it indicates that the first heat exchanger coil can absorb heat, and this condition is generally satisfied when heating is started. The temperature and the humidity of the air passing through the first outdoor heat exchanger 202 are detected by the first temperature and humidity sensor 208 in real time, and the corresponding first dew point temperature and first freezing point temperature (the dew point temperature is less than the freezing point temperature, the dew point temperature is the temperature when the air is condensed, and the freezing point temperature is the temperature when the air is frosted) are calculated by the system.
Exemplarily, referring to fig. 4, fig. 4 is a first flowchart of the operation of the controller of the air conditioner according to the embodiment of the present invention, where the controller is configured to execute steps S11 to S16:
and S11, judging whether the air conditioner is in a heating mode, if so, entering a step S12, and if not, executing the step S11 again.
S12, when the air conditioner is in the heating mode, the first freezing point temperature of the first outdoor heat exchanger 202 is calculated, and then the process proceeds to step S13.
In step S12, referring to fig. 5, fig. 5 is a second flowchart illustrating an operation of a controller in an air conditioner according to an embodiment of the present invention, where the controller is configured to perform steps S121 to S123:
s121, acquiring a first current temperature and a first current humidity of the detected air flowing through the first outdoor heat exchanger 202; the first current temperature and the first current humidity can be detected by the first temperature and humidity sensor;
s122, searching a first target temperature corresponding to the first current temperature and the first current humidity in a preset solidification temperature lookup table according to the first current temperature and the first current humidity;
s123, setting the first target temperature as the first freezing point temperature of the first outdoor heat exchanger 202.
S13, the first coil temperature of the first outdoor heat exchanger 202 is obtained, and then the process goes to step S14. The first coil temperature can be measured by the first coil bulb.
S14, judging whether the first coil temperature is less than or equal to the first freezing point temperature, if so, entering step S16, otherwise, entering step S15.
And S15, when the first coil pipe temperature is higher than the first freezing point temperature, keeping the opening degree of the outdoor throttling device 203 in a full-open state.
For example, if the first coil temperature is greater than the first freezing point temperature, the coil temperature of the first outdoor heat exchanger 202 is between the current outdoor dew point temperature and the first freezing point temperature, and at this time, the first outdoor heat exchanger 202 only condenses and does not frost, and the opening degree of the outdoor throttling device 203 is kept unchanged. Under the condition of enough heat absorption capacity, condensation and dehumidification of the first outdoor heat exchanger 202 are guaranteed without frosting, and the heat exchange temperature of the first outdoor heat exchanger 202 reaches a low-temperature state of effective heat absorption. For the air passing through the first outdoor heat exchanger 202, which is reduced in temperature and also reduced in humidity, the heat of the heat exchange is absorbed by the first outdoor heat exchanger 202 in both sensible heat and latent heat. Or, at this time, the first coil temperature is greater than the outdoor dew point temperature (the outdoor dew point temperature is greater than the first freezing point temperature), which indicates that the outdoor environment heat potential is great, the opening degree of the outdoor throttling device 203 is in a fully open state, and the first outdoor heat exchanger 202 and the second outdoor heat exchanger 204 absorb the outside heat with the maximum capacity
And S16, when the temperature of the first coil pipe is less than or equal to the first freezing point temperature, reducing the opening degree of the outdoor throttling device 203 until the temperature of the first coil pipe is greater than the first freezing point temperature.
Illustratively, if the first coil temperature is less than or equal to the first freezing point temperature, the first outdoor heat exchanger 202 will begin to frost, and at this time, the opening degree of the outdoor throttling device 203 is reduced to increase the gauge pressure of the first outdoor heat exchanger 202, so that the first coil temperature of the first outdoor heat exchanger 202 is not frosted above the first freezing point temperature. When the opening degree of the throttling device is reduced, the refrigerant flowing into the second outdoor heat exchanger 204 is reduced, and the refrigerant is accumulated in the first outdoor heat exchanger 202, so that the pressure of the first heat exchanger is increased, and the coil temperature of the refrigerant is higher because the refrigerant is at normal temperature and low pressure in the first outdoor heat exchanger 202 at the moment, so that the first outdoor heat exchanger 202 does not frost. And the second outdoor heat exchanger 204 absorbs heat for the second time after being throttled for the second time by the outdoor throttling device 203, that is, the second coil temperature of the second outdoor heat exchanger is lower than the first coil temperature, and because the object of heat absorption by the second outdoor heat exchanger 204 is the air dehumidified by the first outdoor heat exchanger 202, the air humidity is very low, and the corresponding second freezing point temperature is very low, even if the second coil temperature of the second outdoor heat exchanger 204 is lower than the first freezing point temperature, the air dehumidified by the first outdoor heat exchanger 202 exchanges heat with the second outdoor heat exchanger 204 is the air having lower corresponding second freezing point temperature, and it is difficult to achieve the frosting condition.
For example, the opening degree of the outdoor throttling device 203 may be adjusted to be smaller according to the temperature difference between the first coil temperature and the first freezing point temperature, a plurality of opening degree adjustment values are preset, the opening degree adjustment values are in inverse proportion to the temperature difference, after the temperature difference is obtained, the corresponding opening degree adjustment value is obtained, and then the opening degree of the outdoor throttling device 203 is adjusted to be smaller according to the opening degree adjustment value. When the temperature difference is small, it means that the first outdoor heat exchanger 202 will produce less frost, and at this time, it is not necessary to reduce the opening degree too much, thereby avoiding the occurrence of the frosting phenomenon; conversely, when the temperature difference is large, it means that more frost is generated in the first outdoor heat exchanger 202, and at this time, the opening degree needs to be adjusted to be smaller.
After step S13, the controller is further configured to: acquiring the dry bulb humidity and the relative humidity of the air flowing through the first outdoor heat exchanger 202, and calculating a first dew point temperature of the first outdoor heat exchanger 202 according to the dry bulb humidity and the relative humidity; wherein the first dew point temperature is greater than the first freezing point temperature; and when the first coil temperature is lower than the first dew point temperature and higher than the first freezing point temperature, controlling the outdoor throttling device 203 to be kept in a fully open state.
Exemplarily, referring to fig. 6, fig. 6 is a third flowchart of the controller of the air conditioner according to the embodiment of the present invention, where the controller is further configured to execute steps S131 to S134:
s131, the dry bulb humidity and the relative humidity of the air flowing through the first outdoor heat exchanger 202 are acquired, and then the process proceeds to step S132.
S132, calculating a first dew point temperature of the first outdoor heat exchanger 202 according to the dry bulb humidity and the relative humidity, and then entering the step S133.
S133, it is determined whether the first freezing point temperature < the first coil temperature < the first dew point temperature is satisfied, and if so, the process proceeds to step S134, and if not, the remaining control logic, such as step S14, is executed.
And S134, controlling the outdoor throttling device 203 to be kept in a fully open state when the first freezing point temperature < the first coil temperature < the first dew point temperature is met.
Illustratively, the coil temperature of the first outdoor heat exchanger 202 is between the dew point temperature and the first freezing point temperature, and at this time, the first outdoor heat exchanger 202 only condenses and does not frost, and the opening degree of the outdoor throttling device 203 is kept unchanged. Under the condition of enough heat absorption capacity, condensation and dehumidification of the first outdoor heat exchanger 202 are guaranteed without frosting, and the heat exchange temperature of the first outdoor heat exchanger 202 reaches a low-temperature state of effective heat absorption.
After executing step S16, the controller is further configured to: after the opening degree of the outdoor throttling device 203 is reduced, calculating a second freezing point temperature of the second outdoor heat exchanger 204; acquiring a second coil temperature of the second outdoor heat exchanger 204, and when the second coil temperature is less than or equal to the second freezing point temperature, increasing the opening degree of the outdoor throttle valve 201 until the second coil temperature is greater than the second freezing point temperature.
Exemplarily, referring to fig. 7, fig. 7 is a fourth operation flowchart of the controller in the air conditioner according to the embodiment of the present invention, where the controller is further configured to execute steps S17 to S21:
s17, the opening degree of the outdoor expansion device 203 is reduced, and then the second freezing point temperature of the second outdoor heat exchanger 204 is calculated, and the process proceeds to step S18.
In step S17, referring to fig. 8, fig. 8 is a fifth flowchart illustrating operation of a controller in an air conditioner according to an embodiment of the present invention, where the controller is further configured to execute steps S171 to S173:
s171, acquiring a second current temperature and a second current humidity of the detected air flowing through the second outdoor heat exchanger 204;
s172, searching a first target temperature corresponding to the second current temperature and the second current humidity in a preset solidification temperature lookup table according to the second current temperature and the second current humidity;
s173, setting the second target temperature as the second freezing point temperature of the second outdoor heat exchanger 204.
S18, obtaining a second coil temperature of the second outdoor heat exchanger 204, which can be detected by the second coil bulb, and then entering step S19.
S19, judging whether the second coil temperature is less than or equal to the second freezing point temperature, if so, entering a step S20, and if not, entering a step S21.
And S20, when the second coil temperature is less than or equal to the second freezing point temperature, increasing the opening degree of the outdoor throttle valve 201 until the second coil temperature is greater than the second freezing point temperature.
For example, for the second outdoor heat exchanger 204 as an auxiliary heat absorption heat exchanger in the case of ultra-low temperature heating, even if the object of heat absorption is very low humidity, the second freezing point temperature corresponds to a second temperature, and when the first outdoor heat exchanger 202 is not frosted due to insufficient heat absorption, the second coil temperature of the second outdoor heat exchanger 204 is continuously decreased. If the second coil temperature of the second outdoor heat exchanger 204 reaches the second freezing point temperature, the second outdoor heat exchanger 204 may also be frosted, and at this time, the opening degree of the outdoor throttle valve 201 can only be integrally adjusted, the coil temperature of the outdoor heat exchanger is slightly increased, and the heat absorption capacity of the whole outdoor unit is reduced, so that the reciprocating circulation reaches the low-temperature limit of the low-temperature heating of the air conditioner.
S21, when the second coil temperature is higher than the second freezing point temperature, keeping the current opening of the outdoor throttle valve 201 unchanged.
Specifically, the outdoor environment can be divided into the following three phases:
first stage (steps S131 to S134 described above): when the outdoor throttling device 203 is fully opened, the freezing point temperature of the whole outdoor unit of the air conditioner of the present invention is the first freezing point temperature, and there is no secondary throttling between the first outdoor heat exchanger 202 and the second outdoor heat exchanger 204 (i.e. the outdoor throttling device 203 is fully opened). The air conditioner at this stage can absorb enough energy for heating in case the outdoor coil temperature is greater than the freezing point temperature.
Second stage (the above steps S12 to S16): the environment temperature is lower under the full open state of outdoor throttling arrangement 203, and the unable sufficient energy that absorbs of outdoor machine coil pipe temperature above the freezing point temperature is used for the heat supply, and the system can fall outdoor coil pipe temperature below the freezing point temperature automatically, and the heating bottleneck that frosts can appear in outdoor heat exchanger this moment. The outdoor coil with the secondary throttling can realize the combined heat absorption of upper and lower freezing points of two outdoor heat exchangers by adjusting the opening degree of the outdoor throttling device 203 at the stage, the first outdoor heat exchanger 202 is responsible for absorbing the total heat of the humid air from the outdoor ring temperature to the first freezing point temperature, the second outdoor heat exchanger 204 is responsible for absorbing the sensible heat of the dry air from the first freezing point temperature to the second freezing point temperature, and the second outdoor heat exchanger 204 is used as an auxiliary heat exchanger. At this stage, the air conditioner has a wider heating application range than a conventional primary throttling air conditioner.
The third stage (the above steps S17 to S21): when the second coil temperature of the second outdoor heat exchanger 204 reaches the second freezing point temperature and sufficient heat is not absorbed, the secondary throttling air conditioner also reaches the environmental bottleneck of heating, and at this time, the opening of the outdoor throttling valve 201 can only be adjusted to prevent the temperature of the outdoor coil from continuously decreasing to reduce the absorption of the outdoor heat.
Referring to fig. 9, fig. 9 is a heat quantity comparison diagram of the operation of the conventional air conditioner and the air conditioner according to the present invention. The line A is a heat operation curve of a conventional air conditioner for heating at low temperature, and heating-defrosting is performed periodically, wherein negative heat is heat consumed for defrosting. From the heat curve, the conventional air conditioner cannot stably supply heat to the indoor space all the time but periodically supply heat in a low-temperature environment. The line B is a heat operation curve of the scheme for heating at low temperature, and it can be seen that the heat generated by the air conditioner in the heating mode is stable.
Compared with the prior art, the air conditioner disclosed by the embodiment of the invention has the advantages that when the temperature of the outdoor coil of the heating room in winter is close to the outdoor freezing point temperature, the temperature of the coil of the two outdoor heat exchangers is divided into the upper temperature layer and the lower temperature layer without frosting by controlling the coil of the two outdoor heat exchangers, the frosting difficulty and the comprehensive heating efficiency of the outdoor unit are improved, the low-temperature application range of the air conditioner for heating in winter is expanded, and the problem that the outdoor unit of the heating room of the current air conditioner for heating in winter is easy to frost is solved. In addition, because frosting does not occur, the problem of indoor no heat output and time consumption during defrosting do not exist, heat can be stably output to the indoor, the stability of indoor temperature is ensured, the comfort experience of a user is improved, and the problem that the indoor temperature is unstable due to frosting of the outdoor unit for heating in winter of the current air conditioner is solved.
Referring to fig. 10, fig. 10 is a flowchart of an air conditioner control method according to an embodiment of the present invention, where the air conditioner control method is implemented by a controller in an air conditioner, the air conditioner includes an indoor unit and an outdoor unit, the outdoor unit is provided with a first outdoor heat exchanger and a second outdoor heat exchanger for performing heat exchange with outside air, and an outdoor throttling device is arranged between the first outdoor heat exchanger and the second outdoor heat exchanger, and the outdoor throttling device is used for regulating a flow rate of a refrigerant flowing from the first outdoor heat exchanger to the second outdoor heat exchanger; the air conditioner control method includes:
s1, when the air conditioner is in a heating mode, calculating a first freezing point temperature of the first outdoor heat exchanger;
s2, acquiring the temperature of a first coil of the first outdoor heat exchanger;
s3, when the temperature of the first coil pipe is less than or equal to the first freezing point temperature, reducing the opening degree of the outdoor throttling device until the temperature of the first coil pipe is greater than the first freezing point temperature; the outdoor throttling device is in a full-open state by default when the air conditioner is started.
Specifically, in step S1, the calculating the first freezing point temperature of the first outdoor heat exchanger includes: acquiring a first current temperature and a first current humidity of the detected air flowing through the first outdoor heat exchanger; searching a first target temperature corresponding to the first current temperature and the first current humidity in a preset solidification temperature lookup table according to the first current temperature and the first current humidity; and taking the first target temperature as the first freezing point temperature of the first outdoor heat exchanger.
Specifically, in step S3, if the first coil temperature is greater than the first freezing point temperature, the first outdoor heat exchanger coil temperature is between the outdoor dew point temperature and the first freezing point temperature, and at this time, the first outdoor heat exchanger only condenses the dew without frosting, and the opening degree of the outdoor throttling device is kept unchanged. Under the condition of enough heat absorption capacity, condensation and dehumidification of the first outdoor heat exchanger are guaranteed without frosting, and the heat exchange temperature of the first outdoor heat exchanger reaches a low-temperature state of effective heat absorption. For the air passing through the first outdoor heat exchanger, the temperature is reduced and the humidity is reduced, and the heat of heat exchange is absorbed by the first outdoor heat exchanger in the forms of sensible heat and latent heat. Or at the moment, the temperature of the first coil pipe is higher than the outdoor dew point temperature (the outdoor dew point temperature is higher than the first freezing point temperature), which indicates that the outdoor environment heat potential is very large, the opening degree of the outdoor throttling device is in a full-open state, and the first outdoor heat exchanger and the second outdoor heat exchanger absorb the outside heat with the maximum capacity
If the temperature of the first coil pipe is less than or equal to the first freezing point temperature, the first outdoor heat exchanger starts to frost, the opening degree of the outdoor throttling device is reduced at the moment, the gauge pressure of the first outdoor heat exchanger is improved, and the first coil pipe temperature of the first outdoor heat exchanger is promoted to be not frosted above the first freezing point temperature. When the opening degree of the throttling device is reduced, the refrigerant flowing into the second outdoor heat exchanger is reduced, so that the refrigerant is accumulated in the first outdoor heat exchanger, the pressure of the first heat exchanger is increased, and the coil temperature of the refrigerant is higher because the refrigerant is at normal temperature and low pressure in the first outdoor heat exchanger, so that the first outdoor heat exchanger does not frost. And the second outdoor heat exchanger absorbs heat for the second time after being throttled for the second time by the outdoor throttling device, namely the second coil temperature of the second outdoor heat exchanger is lower than the first coil temperature, and because the object of heat absorption of the second outdoor heat exchanger is the air dehumidified by the first outdoor heat exchanger, the air humidity is very low, the corresponding second freezing point temperature is very low, even if the second coil temperature of the second outdoor heat exchanger is lower than the first freezing point temperature, the air dehumidified by the first outdoor heat exchanger exchanges heat with the second outdoor heat exchanger is lower than the corresponding second freezing point temperature, and the frosting condition is difficult to achieve.
For example, the opening degree of the outdoor throttling device may be reduced according to a temperature difference between the first coil temperature and the first freezing point temperature, a plurality of opening degree adjustment values are preset, the opening degree adjustment values are inversely proportional to the temperature difference, after the temperature difference is obtained, the corresponding opening degree adjustment value is obtained, and then the opening degree of the outdoor throttling device is reduced according to the opening degree adjustment value. When the temperature difference is small, the first outdoor heat exchanger generates less frost, and the opening degree does not need to be reduced too much, so that the frosting phenomenon is avoided; on the contrary, when the temperature difference is large, it means that the first outdoor heat exchanger generates more frost, and at this time, the opening degree needs to be adjusted to be smaller.
Optionally, the air conditioner control method further includes: acquiring dry bulb humidity and relative humidity of air flowing through the first outdoor heat exchanger, and calculating a first dew point temperature of the first outdoor heat exchanger according to the dry bulb humidity and the relative humidity; wherein the first dew point temperature is greater than the first freezing point temperature; and when the first coil pipe temperature is lower than the first dew point temperature and higher than the first freezing point temperature, controlling the outdoor throttling device to be kept in a fully open state.
For example, the temperature of the coil of the first outdoor heat exchanger is between the dew point temperature and the first freezing point temperature of the outdoor at that time, and at this time, the first outdoor heat exchanger only condenses and does not frost, and the opening degree of the outdoor throttling device is kept unchanged. Under the condition of enough heat absorption capacity, condensation and dehumidification of the first outdoor heat exchanger are guaranteed without frosting, and the heat exchange temperature of the first outdoor heat exchanger reaches a low-temperature state of effective heat absorption.
Optionally, the outdoor unit further comprises an outdoor throttle valve arranged between the first outdoor heat exchanger and the indoor heat exchanger, the outdoor throttle valve is used for regulating the flow of the refrigerant flowing into the first outdoor heat exchanger from the indoor heat exchanger, and the outdoor throttle valve regulates the opening degree of the outdoor throttle valve according to the superheat degree of return air when the outdoor throttle device is in a fully open state; then, the air conditioner control method further includes: after the opening degree of the outdoor throttling device is reduced, calculating a second freezing point temperature of the second outdoor heat exchanger; and acquiring a second coil temperature of the second outdoor heat exchanger, and when the second coil temperature is less than or equal to the second freezing point temperature, increasing the opening degree of the outdoor throttle valve until the second coil temperature is greater than the second freezing point temperature.
Illustratively, the calculating the second freezing point temperature of the second outdoor heat exchanger includes: acquiring a second current temperature and a second current humidity of the detected air flowing through the second outdoor heat exchanger; searching a first target temperature corresponding to the second current temperature and the second current humidity in a preset solidification temperature lookup table according to the second current temperature and the second current humidity; and taking the second target temperature as the second freezing point temperature of the second outdoor heat exchanger.
For the second outdoor heat exchanger as the auxiliary heat absorption heat exchanger in the ultra-low temperature heating condition, even if the heat absorption object is very low humidity, the second outdoor heat exchanger corresponds to a second freezing point temperature, and when the first outdoor heat exchanger is ensured not to frost due to insufficient heat absorption, the temperature of the second coil of the second outdoor heat exchanger is continuously reduced. If the temperature of the second coil of the second outdoor heat exchanger reaches the second freezing point temperature, the second outdoor heat exchanger may be frosted, and at this time, the opening degree of the outdoor throttle valve can be increased as a whole, the temperature of the coil of the outdoor heat exchanger is slightly increased, and the heat absorption capacity of the whole outdoor unit is reduced, so that the reciprocating circulation is performed, and the low-temperature limit of the low-temperature heating of the air conditioner is reached. When the second coil temperature is greater than the second freezing point temperature, the current opening degree of the outdoor throttle valve is kept unchanged.
Compared with the prior art, the air conditioner control method disclosed by the embodiment of the invention has the advantages that when the temperature of the outdoor coil of the heating machine is close to the outdoor freezing point temperature in winter, the temperature of the coil of the two outdoor heat exchangers is divided into the upper temperature layer and the lower temperature layer without frosting by controlling the coil of the two outdoor heat exchangers, the frosting difficulty and the comprehensive heating efficiency of the outdoor machine are improved, the low-temperature use range of the air conditioner for heating in winter is expanded, and the problem that the outdoor machine of the air conditioner for heating in winter is easy to frost at present is solved. In addition, because frosting does not occur, the problem of indoor no heat output and time consumption during defrosting do not exist, heat can be stably output to the indoor, the stability of indoor temperature is ensured, the comfort experience of a user is improved, and the problem that the indoor temperature is unstable due to frosting of the outdoor unit for heating in winter of the current air conditioner is solved.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention.
Claims (10)
1. An air conditioner, comprising:
an indoor unit for adjusting the temperature and humidity of indoor air;
the outdoor unit is connected with the indoor unit through a connecting pipe, and is provided with a first outdoor heat exchanger, a second outdoor heat exchanger and an outdoor throttling device, wherein the first outdoor heat exchanger and the second outdoor heat exchanger are used for exchanging heat with outside air, the outdoor throttling device is arranged between the first outdoor heat exchanger and the second outdoor heat exchanger and is used for regulating the flow of a refrigerant flowing into the second outdoor heat exchanger from the first outdoor heat exchanger;
the controller is used for calculating the first freezing point temperature of the first outdoor heat exchanger when the air conditioner is in a heating mode; acquiring a first coil temperature of a first outdoor heat exchanger, and when the first coil temperature is less than or equal to the first freezing point temperature, reducing the opening degree of the outdoor throttling device until the first coil temperature is greater than the first freezing point temperature; the outdoor throttling device is in a full-open state by default when the air conditioner is started.
2. The air conditioner of claim 1, wherein the outdoor unit further comprises:
the first temperature and humidity sensor is arranged outside the first outdoor heat exchanger and used for detecting the temperature and the humidity of air passing through the first outdoor heat exchanger;
the controller is further configured to:
acquiring dry bulb humidity and relative humidity of air flowing through the first outdoor heat exchanger, and calculating a first dew point temperature of the first outdoor heat exchanger according to the dry bulb humidity and the relative humidity; wherein the first dew point temperature is greater than the first freezing point temperature;
and when the first coil pipe temperature is lower than the first dew point temperature and higher than the first freezing point temperature, controlling the outdoor throttling device to be kept in a fully open state.
3. The air conditioner of claim 1, wherein the controller is further configured to:
the method comprises the steps of obtaining a first current temperature and a first current humidity of detected air flowing through a first outdoor heat exchanger, searching a first target temperature corresponding to the first current temperature and the first current humidity in a preset freezing temperature lookup table according to the first current temperature and the first current humidity, and taking the first target temperature as a first freezing point temperature of the first outdoor heat exchanger.
4. The air conditioner of claim 1, wherein the outdoor unit further comprises:
an outdoor throttle valve provided between the first outdoor heat exchanger and the indoor heat exchanger for regulating a flow rate of the refrigerant flowing from the indoor heat exchanger into the first outdoor heat exchanger; the outdoor throttle valve adjusts the opening degree of the outdoor throttle valve according to the superheat degree of return air when the outdoor throttle device is in a full-open state;
the controller is further configured to:
after the opening degree of the outdoor throttling device is reduced, calculating a second freezing point temperature of the second outdoor heat exchanger;
and acquiring a second coil temperature of the second outdoor heat exchanger, and when the second coil temperature is less than or equal to the second freezing point temperature, increasing the opening degree of the outdoor throttle valve until the second coil temperature is greater than the second freezing point temperature.
5. The air conditioner of claim 4, wherein the outdoor unit further comprises:
the second temperature and humidity sensor is arranged outside the second outdoor heat exchanger and used for detecting the temperature and the humidity of the air passing through the second outdoor heat exchanger;
the controller is further configured to:
and acquiring a second current temperature and a second current humidity of the detected air flowing through the second outdoor heat exchanger, searching a first target temperature corresponding to the second current temperature and the second current humidity in a preset freezing temperature lookup table according to the second current temperature and the second current humidity, and taking the second target temperature as a second freezing point temperature of the second outdoor heat exchanger.
6. The control method of the air conditioner is characterized in that a first outdoor heat exchanger and a second outdoor heat exchanger which are used for exchanging heat with outside air and an outdoor throttling device which is arranged between the first outdoor heat exchanger and the second outdoor heat exchanger are arranged on an outdoor unit of the air conditioner, and the outdoor throttling device is used for adjusting the flow of a refrigerant flowing into the second outdoor heat exchanger from the first outdoor heat exchanger; the air conditioner control method includes:
when the air conditioner is in a heating mode, calculating a first freezing point temperature of the first outdoor heat exchanger;
acquiring a first coil temperature of a first outdoor heat exchanger;
when the first coil pipe temperature is less than or equal to the first freezing point temperature, the opening degree of the outdoor throttling device is reduced until the first coil pipe temperature is greater than the first freezing point temperature; the outdoor throttling device is in a full-open state by default when the air conditioner is started.
7. The air conditioner control method as claimed in claim 6, further comprising:
acquiring the dry bulb humidity and the relative humidity of the air flowing through the first outdoor heat exchanger;
calculating a first dew point temperature of the first outdoor heat exchanger according to the dry-bulb humidity and the relative humidity; wherein the first dew point temperature is greater than the first freezing point temperature;
and when the first coil pipe temperature is lower than the first dew point temperature and higher than the first freezing point temperature, controlling the outdoor throttling device to be kept in a fully open state.
8. The air conditioner controlling method as claimed in claim 6, wherein said calculating the first freezing point temperature of the first outdoor heat exchanger includes:
acquiring a first current temperature and a first current humidity of the detected air flowing through the first outdoor heat exchanger;
and searching a first target temperature corresponding to the first current temperature and the first current humidity in a preset freezing temperature lookup table according to the first current temperature and the first current humidity, and taking the first target temperature as the first freezing point temperature of the first outdoor heat exchanger.
9. The air conditioner controlling method as claimed in claim 6, wherein said outdoor unit further includes an outdoor throttle valve provided between said first outdoor heat exchanger and an indoor heat exchanger, said outdoor throttle valve being for regulating a flow rate of refrigerant flowing from said indoor heat exchanger into said first outdoor heat exchanger, said outdoor throttle valve being self-opening regulated in accordance with a degree of superheat of return air when said outdoor throttle device is in a fully open state; then, the air conditioner control method further includes:
after the opening degree of the outdoor throttling device is reduced, calculating a second freezing point temperature of the second outdoor heat exchanger;
acquiring a second coil temperature of the second outdoor heat exchanger;
and when the temperature of the second coil is less than or equal to the second freezing point temperature, the opening degree of the outdoor throttle valve is increased until the temperature of the second coil is greater than the second freezing point temperature.
10. The air conditioner controlling method as claimed in claim 9, wherein said calculating the second freezing point temperature of the second outdoor heat exchanger includes:
acquiring a second current temperature and a second current humidity of the detected air flowing through the second outdoor heat exchanger;
and searching a first target temperature corresponding to the second current temperature and the second current humidity in a preset freezing temperature lookup table according to the second current temperature and the second current humidity, and taking the second target temperature as a second freezing point temperature of the second outdoor heat exchanger.
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| US20130091882A1 (en) * | 2011-10-12 | 2013-04-18 | Eunjun Cho | Air conditioner |
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| CN108800437A (en) * | 2018-05-24 | 2018-11-13 | 青岛海尔空调器有限总公司 | Air conditioner inhibits frosting control method |
| CN113108424A (en) * | 2021-05-20 | 2021-07-13 | 广东美的制冷设备有限公司 | Air conditioner, heating control method thereof and computer readable storage medium |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US20130091882A1 (en) * | 2011-10-12 | 2013-04-18 | Eunjun Cho | Air conditioner |
| CN104930770A (en) * | 2015-05-29 | 2015-09-23 | 广东美的制冷设备有限公司 | Defrosting method and defrosting device of heat pump air conditioner |
| CN104913481A (en) * | 2015-06-30 | 2015-09-16 | 珠海格力电器股份有限公司 | Heat exchanger and air conditioning unit |
| JP2017089950A (en) * | 2015-11-06 | 2017-05-25 | 株式会社富士通ゼネラル | Air Conditioning System |
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