CN113970166A - Defrosting control method for air conditioner and air conditioner - Google Patents
Defrosting control method for air conditioner and air conditioner Download PDFInfo
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- CN113970166A CN113970166A CN202111165185.8A CN202111165185A CN113970166A CN 113970166 A CN113970166 A CN 113970166A CN 202111165185 A CN202111165185 A CN 202111165185A CN 113970166 A CN113970166 A CN 113970166A
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- 238000010257 thawing Methods 0.000 title claims abstract description 153
- 238000000034 method Methods 0.000 title claims abstract description 62
- 238000010438 heat treatment Methods 0.000 claims abstract description 65
- 239000007788 liquid Substances 0.000 claims description 17
- 230000003247 decreasing effect Effects 0.000 claims description 2
- 239000003570 air Substances 0.000 description 101
- 239000003507 refrigerant Substances 0.000 description 24
- 238000001704 evaporation Methods 0.000 description 4
- 230000008020 evaporation Effects 0.000 description 4
- 239000012080 ambient air Substances 0.000 description 2
- 238000007664 blowing Methods 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 238000005057 refrigeration Methods 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000977 initiatory effect Effects 0.000 description 1
- 230000003434 inspiratory effect Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
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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
- F24F11/42—Defrosting; Preventing freezing of outdoor units
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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
- F24F11/50—Control or safety arrangements characterised by user interfaces or communication
- F24F11/61—Control or safety arrangements characterised by user interfaces or communication using timers
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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
- F24F11/62—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
- F24F11/63—Electronic processing
- F24F11/64—Electronic processing using pre-stored data
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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
- F24F11/62—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
- F24F11/63—Electronic processing
- F24F11/65—Electronic processing for selecting an operating mode
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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
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
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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
- F24F11/89—Arrangement or mounting of control or safety devices
-
- 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
- F24F2110/12—Temperature of the outside air
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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
- F24F2110/00—Control inputs relating to air properties
- F24F2110/20—Humidity
- F24F2110/22—Humidity of the outside air
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Physics & Mathematics (AREA)
- Fuzzy Systems (AREA)
- Mathematical Physics (AREA)
- Human Computer Interaction (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention relates to a defrosting control method for an air conditioner and the air conditioner. When the air conditioner operates in the heating mode, the defrosting control method includes: detecting the outdoor environment temperature Tao, the outdoor environment humidity Tai, the fin temperature Ta and the defrosting temperature Te of an outdoor heat exchanger of the air conditioner; determining a dew point temperature Tz based on the outdoor ambient temperature Tao and the outdoor ambient humidity Tai; acquiring the heating operation time of the air conditioner; when the following conditions are met, the air conditioner is controlled to enter a defrosting mode: the outdoor ambient temperature Tao is less than or equal to a first preset ambient temperature threshold value; the heating operation time is longer than or equal to the preset heating time; the dew point temperature Tz is less than or equal to the fin temperature Ta; and the defrosting temperature Te and the outdoor ambient temperature Tao satisfy a predetermined temperature relationship. In the defrosting judgment process, the air conditioner is controlled to enter the defrosting mode only when the conditions of the four different factors influencing defrosting are simultaneously met, so that the false defrosting phenomenon can be avoided to the maximum extent, and the experience of a user on the air conditioner is further improved.
Description
Technical Field
The invention relates to the field of air conditioners, in particular to a defrosting control method for an air conditioner and the air conditioner.
Background
Air conditioners, including but not limited to one-drive-many central air conditioners and fresh air blowers, are very common in modern society for adjusting indoor temperature so that the indoor temperature is more consistent with the physical comfort of people. The basic components of an air conditioner having a heating function generally include a compressor, an outdoor heat exchanger, an indoor heat exchanger, a four-way valve, and a throttle valve. When the air conditioner heats, the compressor operates to compress the refrigerant into a high-temperature and high-pressure gas refrigerant; the high-temperature and high-pressure gas refrigerant then passes through an indoor heat exchanger (which serves as a condenser at this time) to emit heat into a room to heat indoor air, and the high-temperature and high-pressure gas refrigerant is condensed into a medium-high-temperature liquid refrigerant; the medium-high temperature liquid refrigerant is throttled by a throttle valve (such as an electronic expansion valve or a thermal expansion valve) into low-temperature and low-pressure liquid refrigerant; the low-temperature, low-pressure liquid refrigerant flows into the outdoor heat exchanger (which now serves as an evaporator) and is evaporated therein into a low-temperature, low-pressure gaseous refrigerant by absorbing heat of outdoor ambient air; the low-temperature, low-pressure gaseous refrigerant is then sucked by the compressor and compressed again into a high-temperature, high-pressure gaseous refrigerant, and the air conditioner thus starts a new cycle. When the temperature of the external environment is already low (e.g., close to 0 ℃ or lower than 0 ℃), the temperature of the surface of the outdoor heat exchanger is lowered to be lower than the temperature of the external environment during the evaporation of the refrigerant, and thus the surface of the outdoor heat exchanger is likely to be frosted. The frosting can reduce the air channel between the fins of the outdoor heat exchanger, increase the thermal resistance of the outdoor heat exchanger, cause the performance of the outdoor heat exchanger to be rapidly deteriorated, and even possibly cause the outdoor heat exchanger to be damaged in serious cases. Therefore, it is necessary to defrost the frost layer of the outdoor heat exchanger after the frost layer has reached a certain thickness.
How to defrost quickly or prolong the defrosting period is a problem which is concerned at present and is difficult to break through. At present, most air conditioner models have the problem of false defrosting in winter, so that the heating of an indoor unit is stopped during the false defrosting period, and the user experience is influenced. The term "false defrosting" means that although there is substantially no frost or little frost in the outdoor heat exchanger of the outdoor unit, the air conditioner still performs a defrosting operation. In order to overcome the problem of false defrosting, the chinese patent of invention CN103836857B discloses a defrosting method for an air conditioner. Specifically, the defrosting method collects the ambient temperature, the ambient humidity, and the fin temperature; calculating the dew point temperature corresponding to the environment temperature and the environment humidity; judging whether the fins meet the frosting condition or not according to the relationship between the fin temperature and the dew point temperature; and if the air suction pressure is consistent with the preset air suction pressure, acquiring the air suction pressure, calculating the evaporation temperature corresponding to the air suction pressure and the change rate of the evaporation temperature, and if the change rate is greater than or equal to the preset change rate, starting defrosting. According to the technical scheme, whether the air conditioner really needs defrosting is judged according to the relationship between the temperature of the fins and the dew point temperature and the change rate of the evaporation temperature, and the problem of false defrosting cannot be accurately solved.
Accordingly, there is a need in the art for a new solution to the above problems.
Disclosure of Invention
In order to solve the above-mentioned problems in the prior art, i.e. to solve the technical problem in the prior art that false defrosting cannot be accurately excluded, the present invention provides a defrosting control method for an air conditioner, which includes, when the air conditioner is operated in a heating mode:
detecting an outdoor environment temperature Tao, an outdoor environment humidity Tai, a fin temperature Ta and a defrosting temperature Te of an outdoor heat exchanger of the air conditioner;
determining a dew point temperature Tz based on the outdoor ambient temperature Tao and the outdoor ambient humidity Tai;
acquiring the heating operation time of the air conditioner;
controlling the air conditioner to enter a defrosting mode when the following conditions are met:
the outdoor environment temperature Tao is less than or equal to a first preset environment temperature threshold value;
the heating operation time is more than or equal to the preset heating time;
the dew point temperature Tz is less than or equal to the fin temperature Ta; and
the defrosting temperature Te and the outdoor environment temperature Tao satisfy a predetermined temperature relationship.
In the heating process of the air conditioner, in order to more accurately judge that the frost layer really exists on the outdoor heat exchanger and reaches the degree to be removed, the defrosting control method for the air conditioner simultaneously introduces the conditions of four different factors influencing defrosting: the outdoor environment temperature Tao is less than or equal to a first preset environment temperature threshold value, the heating operation time length is more than or equal to a preset heating time length, the dew point temperature Tz is less than or equal to the fin temperature Ta, and the defrosting temperature Te and the outdoor environment temperature Tao meet a preset temperature relation. Only when the four conditions are met at the same time, the fact that the outdoor heat exchanger of the air conditioner really needs to be defrosted can be determined, and then the air conditioner is controlled to enter a defrosting mode. In order to determine the conditions of the four different defrosting factors, the defrosting control method needs to detect the outdoor environment temperature Tao, the outdoor environment humidity Tai, the fin temperature Ta of the outdoor heat exchanger of the air conditioner and the defrosting temperature Te respectively, determine the dew point temperature Tz based on the outdoor environment temperature Tao and the outdoor environment humidity Tai, and determine the heating operation time of the air conditioner.
In the above-described preferred embodiment of the defrosting control method for an air conditioner,
the predetermined temperature relationship is any one of the following temperature relationships:
when the outdoor environment temperature Tao is larger than or equal to a second preset environment temperature threshold, the defrosting temperature Te is smaller than or equal to a first defrosting temperature threshold and lasts for a preset time;
when a third preset environment temperature threshold value is not more than the outdoor environment temperature Tao < the second preset environment temperature threshold value, the defrosting temperature Te is not more than the second defrosting temperature threshold value and lasts for the preset time;
when a fourth preset environment temperature threshold value is not greater than the outdoor environment temperature Tao < the third preset environment temperature threshold value, the defrosting temperature Te is not greater than a third defrosting temperature threshold value and lasts for the preset time;
when the outdoor environment temperature Tao is less than the fourth preset environment temperature threshold value, the defrosting temperature Te is less than or equal to the fourth defrosting temperature threshold value and lasts for the preset time length,
wherein the first predetermined ambient temperature threshold is greater than the second predetermined ambient temperature threshold. When the outdoor environment temperature Tao is less than or equal to the first predetermined environment temperature threshold, the heating operation time is greater than or equal to the predetermined heating time, and the dew point temperature Tz is less than or equal to the fin temperature Ta, the existence of a frost layer to be removed on the outdoor heat exchanger cannot be determined. Therefore, in addition to the above three conditions, an additional condition is considered, that is, only when any one of the above four relationships between the defrosting temperature Te and the outdoor ambient temperature Tao is satisfied, it is determined that there is a frost layer on the outdoor heat exchanger that needs to be removed, and thus the outdoor heat exchanger can be defrosted.
In the above-described preferred embodiment of the defrosting control method for an air conditioner,
when the second predetermined ambient temperature threshold is 6 ℃, the first defrost temperature threshold is-6 ℃; and
when the fourth predetermined ambient temperature threshold is-23 ℃, the fourth defrost temperature threshold is-23 ℃. Under the conditions that the outdoor environment temperature Tao is not more than a first preset environment temperature threshold, the heating operation time is not less than a preset heating time, and the dew point temperature Tz is not more than the fin temperature Ta, when the first preset environment temperature threshold is not less than 6 ℃, the defrosting temperature Te is not more than-6 ℃ and lasts for a preset time, the existence of a frost layer needing to be removed on the outdoor heat exchanger can be determined. Or under the conditions that the outdoor environment temperature Tao is less than or equal to a first preset environment temperature threshold value, the heating operation time is more than or equal to a preset heating time, and the dew point temperature Tz is less than or equal to the fin temperature Ta, when the outdoor environment temperature Tao is less than-23 ℃, the defrosting temperature Te is less than or equal to-23 ℃ and lasts for a preset time, the existence of a frost layer needing to be removed on the outdoor heat exchanger can be determined.
In a preferable embodiment of the above-described defrosting control method for an air conditioner, when the second predetermined ambient temperature threshold is 6 ℃ and the third predetermined ambient temperature threshold is-15 ℃, the second defrosting temperature threshold is equal to (5 × Tao-72)/7. Under the conditions that the outdoor environment temperature Tao is less than or equal to a first preset environment temperature threshold value, the heating operation time is more than or equal to a preset heating time, and the dew point temperature Tz is less than or equal to the fin temperature Ta, when the outdoor environment temperature Tao is less than or equal to-15 ℃ and less than or equal to 6 ℃, the defrosting temperature Te is less than or equal to (5 multiplied by Tao-72)/7 and lasts for a preset time, the existence of a frost layer needing to be removed on the outdoor heat exchanger can be determined.
In a preferable embodiment of the above-mentioned defrosting control method for an air conditioner, when the third predetermined ambient temperature threshold is-15 ℃ and the fourth predetermined ambient temperature threshold is-23 ℃, the third defrosting temperature threshold is equal to (Tao-69)/4. Under the conditions that the outdoor environment temperature Tao is less than or equal to a first preset environment temperature threshold value, the heating operation time is more than or equal to a preset heating time, and the dew point temperature Tz is less than or equal to the fin temperature Ta, when the outdoor environment temperature Tao is less than or equal to-23 ℃ and less than or equal to-15 ℃, the defrosting temperature Te is less than or equal to (Tao-69)/4 and lasts for a preset time, and then the existence of a frost layer needing to be removed on the outdoor heat exchanger can be determined.
In a preferable embodiment of the above-described defrosting control method for an air conditioner, when the air conditioner enters the defrosting mode, the defrosting control method further includes:
forcibly opening an expansion valve of an indoor unit of the air conditioner to a preset opening degree, and reducing the rotating speed of a fan of an outdoor unit of the air conditioner to a preset rotating speed;
and after a preset operation time, reversing the four-way valve of the air conditioner, opening the expansion valve of the outdoor unit to the maximum opening degree, and stopping the fan of the outdoor unit to defrost. When the defrosting mode is started, the expansion valve of the indoor unit is forced to be opened to a preset opening degree, the rotating speed of the fan of the outdoor unit is reduced, and the preset running time is passed, so that the air conditioner can be smoothly transited to the defrosting mode, and the condition that a refrigerating system of the air conditioner gives a fault alarm when the air conditioner suddenly enters the defrosting mode is avoided. The four-way valve is reversed to introduce the high-temperature and high-pressure gas refrigerant discharged from the compressor into the outdoor heat exchanger so as to utilize the high temperature to melt the frost layer on the outer surface of the outdoor heat exchanger. In this process, the expansion valve of the outdoor unit is opened to the maximum opening degree to introduce more high-temperature and high-pressure gas refrigerant into the outdoor heat exchanger, and the fan of the outdoor unit is stopped to prevent the ambient air from taking away heat available for defrosting. The arrangement can shorten the defrosting time to the maximum extent and avoid discomfort brought to users by long-time cold air blowing of the indoor unit.
In a preferred embodiment of the above-described defrosting control method for an air conditioner, a defrosting temperature detector is disposed on a liquid collecting tube of the outdoor heat exchanger, and an outdoor heat exchanger middle temperature detector is disposed at a middle position of the outdoor heat exchanger, and the defrosting temperature Te is a lower value of temperatures measured by the defrosting temperature detector and the outdoor heat exchanger middle temperature detector. The defrosting temperature Te is a lower value from the temperatures measured by the defrosting temperature detector and the temperature detector in the middle of the outdoor heat exchanger, and can more accurately reflect the lowest temperature on the outdoor heat exchanger.
In a preferred embodiment of the above-described defrosting control method for an air conditioner, a plurality of fin temperature detectors are disposed on the outdoor heat exchanger, and the fin temperature Ta is an average value or a lower value of temperatures measured by the plurality of fin temperature detectors. The fin temperature Ta thus obtained is more accurate.
In a preferred embodiment of the above-described defrosting control method for an air conditioner, the air conditioner is controlled to exit the defrosting mode when any one of the following conditions is satisfied:
the defrosting duration reaches a preset defrosting duration;
the compressor discharge pressure Pd is greater than or equal to the preset discharge pressure;
the defrosting temperature Te is more than or equal to a first preset defrosting threshold value and lasts for a first preset defrosting time length;
the defrosting temperature Te is more than or equal to a second preset defrosting threshold value and lasts for a second preset defrosting time length;
the defrost temperature Te is greater than or equal to a third predetermined defrost threshold and continues for a third predetermined defrost duration,
wherein the first, second, and third predetermined defrost thresholds are sequentially increased, and the first, second, and third predetermined defrost durations are sequentially decreased. When any one of the above conditions is satisfied, it indicates that the frost layer on the outdoor heat exchanger has been removed, and thus the defrost mode can be exited.
In order to solve the technical problem that false defrosting cannot be accurately eliminated in the prior art, the invention further provides an air conditioner, wherein in the heating mode, the air conditioner controls defrosting by adopting the defrosting control method for the air conditioner according to any one of the above items. By the defrosting control method for the air conditioner, the air conditioner can accurately judge when defrosting is carried out, so that the false defrosting phenomenon is avoided to the maximum extent, and further the influence on user experience caused by heating stop of the indoor unit due to false defrosting is avoided.
Drawings
Preferred embodiments of the present invention are described below with reference to the accompanying drawings, in which:
FIG. 1 is a system schematic of an embodiment of the air conditioner of the present invention;
FIG. 2 is a flowchart of a defrost control method for an air conditioner of the present invention;
fig. 3 is a flowchart of an embodiment of a defrost control method for an air conditioner of the present invention.
List of reference numerals:
1. an air conditioner; 10. an outdoor unit; 11. a compressor; 111. an exhaust port; 112. an air suction port; 113. an exhaust pipe; 114. an exhaust pressure sensor; 115. an inspiratory pressure sensor; 116. an intake air temperature sensor; 117. an air intake duct; 12. a four-way valve; 121. an outdoor heat exchanger gas connection pipe; 122. a gas-liquid separator connecting pipe; 123. a four-way valve gas connection pipe; 13. an outdoor heat exchanger; 131. a liquid connection pipe of the outdoor heat exchanger; 132. a liquid collecting pipe; 133. a defrost temperature detector; 134. a temperature detector in the middle of the outdoor heat exchanger; 135. a fin temperature detector; 136. an outdoor ambient temperature sensor; 137. an outdoor environment humidity sensor; 138. a fin; 14. a refrigerant radiator; 141. a refrigerant radiator connecting pipe; 15. an outdoor expansion valve; 151. an outdoor expansion valve connecting pipe; 152. a liquid pipe stop valve; 153. a filter; 20. an indoor unit; 20a, a first indoor unit; 20b, a second indoor unit; 20c, a third indoor unit; 21. an indoor heat exchanger; 211. an indoor heat exchanger connecting pipe; 212. an air pipe stop valve; 22. an indoor expansion valve; 221. an indoor expansion valve connecting pipe; 23. and an indoor unit temperature sensor.
Detailed Description
Preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only for explaining the technical principle of the present invention, and are not intended to limit the scope of the present invention.
In order to solve the technical problem that false defrosting cannot be accurately eliminated in the prior art, the invention provides a defrosting control method for an air conditioner, wherein when the air conditioner operates in a heating mode, the defrosting control method comprises the following steps:
detecting an outdoor environment temperature Tao, an outdoor environment humidity Tai, a fin temperature Ta and a defrosting temperature Te of an outdoor heat exchanger of the air conditioner (step S1);
determining a dew point temperature Tz based on the outdoor ambient temperature Tao and the outdoor ambient humidity Tai (step S2);
acquiring a heating operation time length of the air conditioner (step S3);
controlling the air conditioner to enter a defrost mode when the following conditions are all satisfied (step S4):
the outdoor environment temperature Tao is less than or equal to a first preset environment temperature threshold value;
the heating operation time is more than or equal to the preset heating time;
the dew point temperature Tz is less than or equal to the fin temperature Ta; and
the defrosting temperature Te and the outdoor environment temperature Tao satisfy a predetermined temperature relationship.
Herein, the "heating operation time period" refers to a time period that lasts after the air conditioner is started to heat, or a heating operation accumulated time period since the last defrosting. In the heating operation of the air conditioner, the "defrosting temperature" is the temperature used for judging whether the outdoor heat exchanger needs to be defrosted, and is generally directly measured from the outdoor heat exchanger.
Fig. 1 is a system diagram of an embodiment of an air conditioner of the present invention. As shown in fig. 1, in one or more embodiments, the air conditioner 1 of the present invention includes an outdoor unit 10 and three indoor units 20 connected in parallel, wherein the indoor units 20 connected in parallel are a first indoor unit 20a, a second indoor unit 20b, and a third indoor unit 20c, respectively, and can be disposed in different rooms. Alternatively, the air conditioner 1 may have one, two, or other suitable number of indoor units. The outdoor unit 10 and each indoor unit 20 are interconnected by refrigerant pipes to form a refrigeration circuit allowing a refrigerant to flow therein. The configuration of each indoor unit 20 may be the same or different according to actual needs. The operation modes of the air conditioner 1 include, but are not limited to, a blowing, cooling, heating, defrosting mode, and a dehumidifying mode.
As shown in fig. 1, each indoor unit 20 includes components such as an indoor heat exchanger 21 and an indoor expansion valve 22. In one or more embodiments, the indoor heat exchanger 21 is a finned coil heat exchanger. Alternatively, the indoor heat exchanger 21 may be a plate heat exchanger or other suitable heat exchanger. The indoor expansion valve 22 may be an electronic expansion valve or a thermostatic expansion valve. The indoor expansion valve 22 is connected to the indoor heat exchanger 21 through an indoor expansion valve connection pipe 221. In one or more embodiments, a temperature sensor 23 is provided on the indoor expansion valve connection 22 and at a position close to the indoor heat exchanger 21 to detect the coil temperature of the indoor heat exchanger 21.
As shown in fig. 1, in one or more embodiments, the outdoor unit 10 includes a compressor 11, a four-way valve 12, an outdoor heat exchanger 13, an outdoor expansion valve 15, and a gas-liquid separator 16. In one or more embodiments, compressor 11 is a screw compressor. Alternatively, the compressor 11 may be a centrifugal compressor, a scroll compressor, or other suitable compressor. Further, the compressor 11 may be configured as two or more compressors connected in parallel. The configuration of each compressor 11 may be the same or different, depending on the actual requirements. The compressor 11 has an exhaust port 111 and a suction port 112. The discharge port 111 of the compressor 11 is connected to the d-port of the four-way valve 12 through a discharge pipe 113. A discharge pressure sensor 114 for detecting a discharge pressure of the compressor 11 is disposed on the discharge pipe 113. The suction port 112 of the compressor 11 is connected to an outlet port (not shown) of the gas-liquid separator 16 through a suction pipe 117. A suction pressure sensor 115 and a suction temperature sensor 116 are respectively disposed on the suction pipe 117 for detecting a suction pressure and a suction temperature of the compressor.
As shown in fig. 1, the four-way valve 12 has a c-port, an e-port, and an s-port in addition to the d-port. The four interfaces can be controlled to be switched on in pairs and can be controlled to change directions, so that in a cooling mode, the interface d is communicated with the interface c, and the interface e is communicated with the interface s, and in a heating mode, the interface d is communicated with the interface e, and the interface c is communicated with the interface s. The c-port of the four-way valve 12 is connected to the outdoor heat exchanger 13 through an outdoor heat exchanger gas connection pipe 121. The e-port of the four-way valve 12 is connected to the gas pipe cut-off valve 212 through the four-way valve gas connection pipe 123, and the gas pipe cut-off valve 212 is connected to each indoor heat exchanger 21 through the indoor heat exchanger connection pipe 211. An s-port of the four-way valve 12 is connected to an air inlet (not labeled in the figure) of the gas-liquid separator 16 through a gas-liquid separator connection pipe 122.
As shown in fig. 1, the outdoor heat exchanger 13 is connected to the refrigerant radiator 14 through an outdoor heat exchanger liquid connection pipe 131. During heating, the refrigerant radiator 14 is used to increase the superheat of the refrigerant to delay defrosting. The refrigerant radiator 14 is connected to the outdoor expansion valve 15 through a refrigerant radiator connection pipe 141. The outdoor expansion valve 15 includes, but is not limited to, an electronic expansion valve and a thermal expansion valve. The outdoor expansion valve 15 is connected to each indoor expansion valve 22 through an outdoor expansion valve connection pipe 151. A filter 153 and a liquid pipe shut-off valve 152 are sequentially disposed on the outdoor expansion valve connection pipe 151 in a direction toward the indoor expansion valve 22. The liquid pipe stop valve 152 and the gas pipe stop valve 212 are matched to facilitate operations such as maintenance and refrigerant supplement of the air conditioner 1.
With continued reference to fig. 1, the outdoor heat exchanger 13 is a finned coil heat exchanger and thus includes a plurality of fins 138 that fit over the hairpin tubes. The outdoor heat exchanger 13 has a header pipe 132. When the air conditioner is operated in the heating mode, the temperature at the sump 132 is generally low compared to other portions of the outdoor heat exchanger 13, and thus a defrost temperature sensor 133 for detecting a defrost temperature Te is disposed on the sump 132. At least one fin temperature detector 135 for detecting a fin temperature Ta is disposed at the fins 138 of the outdoor heat exchanger 13. Further, an outdoor heat exchanger middle temperature detector 134 is also disposed at a middle position of the outdoor heat exchanger 13, for detecting a middle temperature of the outdoor heat exchanger 13.
In order to detect the outdoor ambient temperature Tao and the outdoor ambient humidity, the air conditioner 1 is further provided with an outdoor ambient temperature sensor 136 and an outdoor ambient humidity sensor 137 for detecting the outdoor ambient temperature and the outdoor ambient humidity, respectively. An outdoor ambient temperature sensor 136 and an outdoor ambient humidity sensor 137 may be installed at appropriate positions of the outdoor unit 10.
The following describes in detail a defrosting control method for an air conditioner according to the present invention based on the air conditioner 1 described above. It should be noted that the defrosting control method for an air conditioner of the present invention can also be applied to other suitable refrigeration equipment.
Fig. 2 is a flowchart of a defrost control method for an air conditioner of the present invention. As shown in fig. 2, when the air conditioner is operated in the heating mode, the defrosting control method starts and executes step S1, detecting the outdoor environment temperature Tao, the outdoor environment humidity Tai, the fin temperature Ta of the outdoor heat exchanger 13, and the defrosting temperature Te. As described above, the outdoor ambient temperature Tao may be detected by the outdoor ambient temperature sensor 136 continuously or at predetermined time intervals; the outdoor ambient humidity Tai may be detected by the outdoor ambient humidity sensor 137 continuously or at predetermined time intervals; the fin temperature Ta of the fins 138 may be detected with the fin temperature detector 135 continuously or at predetermined time intervals; the defrost temperature Te may be detected by the defrost temperature detector 133 continuously or at predetermined time intervals. All these measured temperatures are sent to a controller or processor of the air conditioner 1, e.g. a computer board, for further processing. Alternatively, the defrosting temperature Te is a lower value of the temperatures measured by the defrosting temperature detector 133 and the outdoor heat exchanger middle temperature detector 134. Alternatively, the fin temperature Ta is an average value or a lower value of the temperatures measured by the plurality of fin temperature detectors 135.
As shown in fig. 2, after obtaining the outdoor ambient temperature Tao and the outdoor ambient humidity Tai, the defrost control method performs step S2 to determine the dew point temperature Tz based on the outdoor ambient temperature Tao and the outdoor ambient humidity Tai. For example, the dew point temperature Tz is confirmed by querying the psychrometric chart based on the outdoor ambient temperature Tao and the outdoor ambient humidity Tai. Alternatively, the dew point temperature Tz may be directly measured using a dew point detector. The defrosting control method further needs to execute step S3 to obtain the heating operation time period of the air conditioner. It should be noted that the steps S3 and S3 may be executed simultaneously, or one of the steps S3 and S2 may be executed first, and then the other is executed. When the air conditioner starts heating but does not execute defrosting operation, the heating operation time length is the continuous heating time length of the started air conditioner. When the air conditioner has performed the defrosting operation in the heating operation, then the heating operation time period is a continuous heating time period of the air conditioner since the last defrosting.
As shown in fig. 2, after obtaining the outdoor environment temperature Tao, the fin temperature Ta, the dew point temperature Tz, the defrosting temperature Te, and the heating operation time period, the defrosting control method performs step S4, determines whether or not the following four conditions are all satisfied, and controls the air conditioner 1 to enter the defrosting mode when the four conditions are all satisfied. These four conditions are: the outdoor ambient temperature Tao is less than or equal to a first preset ambient temperature threshold value; the heating operation time is longer than or equal to the preset heating time; the dew point temperature Tz is less than or equal to the fin temperature Ta; and the defrosting temperature Te and the outdoor ambient temperature Tao satisfy a predetermined temperature relationship. In one or more embodiments, the first predetermined ambient temperature threshold is 20 ℃. Alternatively, the first predetermined ambient temperature threshold may also be 19 ℃ or other suitable temperature value. When the heating operation period is a continuous heating period of the air conditioner after the start, the predetermined heating period is 30 minutes, or 32 minutes, or 33 minutes, or 35 minutes, or other suitable time period. When the heating operation time period is a continuous heating time period of the air conditioner since the last defrosting, the predetermined heating time period is 55 minutes, or 58 minutes, or 60 minutes, or 62 minutes, or 65 minutes, or other suitable time period. Therefore, the heating operation time length for triggering defrosting for the first time after the air conditioner is started to heat is shorter than the heating operation time length for triggering defrosting again after defrosting is carried out.
In one or more embodiments, there are four predetermined temperature relationships between the defrost temperature Te and the outdoor ambient temperature Tao. The first predetermined temperature relationship is: and when the outdoor environment temperature Tao is greater than or equal to the second preset environment temperature threshold, the defrosting temperature Te is less than or equal to the first defrosting temperature threshold and lasts for a preset time. In one or more embodiments, the second predetermined ambient temperature threshold is 6 ℃, the first defrost temperature threshold is-6 ℃, and the predetermined time period is 5 minutes. Alternatively, the second predetermined ambient temperature threshold and the first defrost temperature threshold may each take on other suitable temperature values, and the predetermined length of time may be other lengths of time that match the second predetermined ambient temperature threshold and the first defrost temperature threshold. The second predetermined temperature relationship is: and when the third preset environment temperature threshold value is less than or equal to the outdoor environment temperature Tao and less than the second preset environment temperature threshold value, the defrosting temperature Te is less than or equal to the second defrosting temperature threshold value and lasts for a preset time. In one or more embodiments, the third predetermined ambient temperature threshold is-15 ℃, the predetermined time period is 5 minutes, and the second defrost temperature threshold is equal to (5 × Tao-72)/7. The third predetermined temperature relationship is: and when the fourth preset environment temperature threshold value is less than or equal to the outdoor environment temperature Tao and less than the third preset environment temperature threshold value, the defrosting temperature Te is less than or equal to the third defrosting temperature threshold value and lasts for a preset time. In one or more embodiments, the fourth predetermined ambient temperature threshold is-23 ℃, the predetermined time period is 5 minutes, and the second defrost temperature threshold is equal to (Tao-69)/4. The fourth predetermined temperature relationship is: and when the outdoor environment temperature Tao is less than the fourth preset environment temperature threshold, the defrosting temperature Te is less than or equal to the fourth defrosting temperature threshold and lasts for a preset time. In one or more embodiments, the fourth defrost temperature threshold is also-23 ℃ and the predetermined time period is 5 minutes.
Fig. 3 is a flowchart of an embodiment of a defrost control method for an air conditioner of the present invention. As shown in fig. 3, when the defrosting control method is started, step S1 is executed to detect the outdoor environment temperature Tao, the outdoor environment humidity Tai, the fin temperature Ta of the outdoor heat exchanger 13, and the defrosting temperature Te. Then, the defrosting control method proceeds to step S11 to confirm whether or not the outdoor ambient temperature Tao is 20 ℃. If the outdoor ambient temperature Tao is greater than 20 deg.c, step S1 is repeatedly performed. If the outdoor ambient temperature Tao is equal to or less than 20 deg.c, step S2 is performed to determine the dew point temperature Tz based on the outdoor ambient temperature Tao and the outdoor ambient humidity Tai. For example, the dew point temperature Tz is obtained by referring to the psychrometric chart based on the outdoor ambient temperature Tao and the outdoor ambient humidity Tai. Next, the defrosting control method executes step S21 to determine whether the dew point temperature Tz is equal to or less than the fin temperature Ta. If the dew point temperature Tz is greater than the fin temperature Ta, indicating that the possibility of frost formation is low, step S1 is repeatedly performed. If the dew point temperature Tz is less than or equal to the fin temperature Ta, step S3 is executed to obtain the heating operation time period of the air conditioner. In the case where the air conditioner has performed the defrosting operation, the defrosting control method performs step S31 to determine whether the heating operation time period is equal to or greater than 60 minutes. If the heating operation time period is less than 60 minutes, the step S1 is repeatedly performed. If the heating operation time is longer than or equal to 60 minutes, the defrosting control method executes step S41, and judges whether the conditions that the outdoor environment temperature Tao is more than or equal to 6 ℃, the defrosting temperature Te is less than or equal to minus 6 ℃ and lasts for 5 minutes are met. If the condition is satisfied, the defrost control method proceeds to step S45 to control the air conditioner to enter the defrost mode. If the condition is not satisfied, the defrost control method proceeds to step S42, and continues to determine whether the conditions of Tao <6 ℃ at-15 ℃, Te < 5Tao-72)/7 for 5 minutes are satisfied. If the condition is satisfied, the defrost control method also proceeds to step S45 to control the air conditioner to enter the defrost mode. If the condition is not satisfied, the defrost control method proceeds to step S43 to continue to determine if the conditions of-23 ℃ Tao ≦ 15 ℃, Te ≦ Tao-69)/4 for 5 minutes are satisfied. If the condition is satisfied, the defrost control method also proceeds to step S45 to control the air conditioner to enter the defrost mode. If the condition is not satisfied, the defrost control method proceeds to step S44 to continue to determine if the conditions of Tao less than-23 deg.C, Te less than or equal to-23 deg.C, and duration of 5 minutes are satisfied. If the condition is satisfied, the defrost control method also proceeds to step S45 to control the air conditioner to enter the defrost mode. If the condition is not satisfied, the defrost control method repeats the step S1.
As shown in fig. 3, when the above-described conditions related to entering defrost are all satisfied, the defrost control method controls the air conditioner to enter the defrost mode in step S45. In one or more embodiments, upon entering the defrost mode, first, the defrost control method forces the indoor expansion valve to a predetermined opening degree, for example, any suitable number of steps between 150 steps and 200 steps, and reduces the fan speed of the outdoor unit to a predetermined speed, for example, 30 rpm; after a predetermined period of operation (e.g., 3 minutes or other suitable period of time), the four-way valve is reversed, the outdoor expansion valve is opened to a maximum opening, and the outdoor unit fan is turned off, thereby initiating defrost.
As shown in fig. 3, when the condition for exiting the defrost mode is satisfied, the air conditioner is controlled to exit the defrost mode (step S5). In one or more embodiments, the condition for exiting the defrost mode is any of the following conditions. The first condition is that a predetermined period of time, such as 10 minutes or other suitable period of time, is reached after defrost operation is initiated. The second condition is that the defrosting temperature Te is ≧ 15 ℃ and 1 minute continues. The third condition is that the defrosting temperature Te is ≧ 20 ℃ and continuous for 30 seconds. The fourth condition is that the defrosting temperature Te is ≧ 30 ℃ and continuous for 5 seconds. The fifth condition is that the compressor discharge pressure Pd is ≧ 3.2 MPa.
So far, the technical solutions of the present invention have been described in connection with the preferred embodiments shown in the drawings, but it is easily understood by those skilled in the art that the scope of the present invention is obviously not limited to these specific embodiments. Equivalent changes or substitutions of related technical features can be made by those skilled in the art without departing from the principle of the invention, and the technical scheme after the changes or substitutions can fall into the protection scope of the invention.
Claims (10)
1. A defrost control method for an air conditioner, the defrost control method comprising, when the air conditioner is operating in a heating mode:
detecting an outdoor environment temperature Tao, an outdoor environment humidity Tai, a fin temperature Ta and a defrosting temperature Te of an outdoor heat exchanger of the air conditioner;
determining a dew point temperature Tz based on the outdoor ambient temperature Tao and the outdoor ambient humidity Tai;
acquiring the heating operation time of the air conditioner;
controlling the air conditioner to enter a defrosting mode when the following conditions are met:
the outdoor environment temperature Tao is less than or equal to a first preset environment temperature threshold value;
the heating operation time is more than or equal to the preset heating time;
the dew point temperature Tz is less than or equal to the fin temperature Ta; and
the defrosting temperature Te and the outdoor environment temperature Tao satisfy a predetermined temperature relationship.
2. The defrost control method for an air conditioner according to claim 1, wherein the predetermined temperature relationship is any one of the following temperature relationships:
when the outdoor environment temperature Tao is larger than or equal to a second preset environment temperature threshold, the defrosting temperature Te is smaller than or equal to a first defrosting temperature threshold and lasts for a preset time;
when a third preset environment temperature threshold value is not more than the outdoor environment temperature Tao < the second preset environment temperature threshold value, the defrosting temperature Te is not more than the second defrosting temperature threshold value and lasts for the preset time;
when a fourth preset environment temperature threshold value is not greater than the outdoor environment temperature Tao < the third preset environment temperature threshold value, the defrosting temperature Te is not greater than a third defrosting temperature threshold value and lasts for the preset time;
when the outdoor environment temperature Tao is less than the fourth preset environment temperature threshold value, the defrosting temperature Te is less than or equal to the fourth defrosting temperature threshold value and lasts for the preset time length,
wherein the first predetermined ambient temperature threshold is greater than the second predetermined ambient temperature threshold.
3. The defrost control method for an air conditioner according to claim 2,
when the second predetermined ambient temperature threshold is 6 ℃, the first defrost temperature threshold is-6 ℃; and
when the fourth predetermined ambient temperature threshold is-23 ℃, the fourth defrost temperature threshold is-23 ℃.
4. The defrost control method for an air conditioner of claim 2, wherein the second defrost temperature threshold is equal to (5 xtao-72)/7 when the second predetermined ambient temperature threshold is 6 ℃ and the third predetermined ambient temperature threshold is-15 ℃.
5. The defrost control method for an air conditioner of claim 2, wherein the third defrost temperature threshold is equal to (Tao-69)/4 when the third predetermined ambient temperature threshold is-15 ℃ and the fourth predetermined ambient temperature threshold is-23 ℃.
6. The defrost control method for an air conditioner according to claim 1, wherein when the air conditioner enters the defrost mode, the defrost control method further comprises:
forcibly opening an expansion valve of an indoor unit of the air conditioner to a preset opening degree, and reducing the rotating speed of a fan of an outdoor unit of the air conditioner to a preset rotating speed;
and after a preset operation time, reversing the four-way valve of the air conditioner, opening the expansion valve of the outdoor unit to the maximum opening degree, and stopping the fan of the outdoor unit to defrost.
7. The defrost control method for an air conditioner according to claim 1, wherein a defrost temperature detector is disposed on a liquid collecting tube of the outdoor heat exchanger, and an outdoor heat exchanger middle temperature detector is disposed at a middle position of the outdoor heat exchanger, the defrost temperature Te being a lower value of temperatures measured by the defrost temperature detector and the outdoor heat exchanger middle temperature detector.
8. The defrost control method for an air conditioner according to claim 1, wherein a plurality of fin temperature detectors are disposed on the outdoor heat exchanger, and the fin temperature Ta is an average value or a lower value of temperatures measured by the plurality of fin temperature detectors.
9. The defrost control method for an air conditioner according to claim 1, wherein the air conditioner is controlled to exit the defrost mode when any one of the following conditions is satisfied:
the defrosting duration reaches a preset defrosting duration;
the compressor discharge pressure Pd is greater than or equal to the preset discharge pressure;
the defrosting temperature Te is more than or equal to a first preset defrosting threshold value and lasts for a first preset defrosting time length;
the defrosting temperature Te is more than or equal to a second preset defrosting threshold value and lasts for a second preset defrosting time length;
the defrost temperature Te is greater than or equal to a third predetermined defrost threshold and continues for a third predetermined defrost duration,
wherein the first, second, and third predetermined defrost thresholds are sequentially increased, and the first, second, and third predetermined defrost durations are sequentially decreased.
10. An air conditioner characterized in that, in a heating mode, the air conditioner controls defrosting using the defrosting control method for an air conditioner according to any one of claims 1 to 9.
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