CN113124544B - Air conditioning unit and defrosting control method thereof - Google Patents
Air conditioning unit and defrosting control method thereof Download PDFInfo
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- CN113124544B CN113124544B CN202110426600.4A CN202110426600A CN113124544B CN 113124544 B CN113124544 B CN 113124544B CN 202110426600 A CN202110426600 A CN 202110426600A CN 113124544 B CN113124544 B CN 113124544B
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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
- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
- F24F11/87—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling absorption or discharge of heat in outdoor units
- F24F11/871—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling absorption or discharge of heat in outdoor units by controlling outdoor fans
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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
- F24F11/88—Electrical aspects, e.g. circuits
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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
- F24F2110/10—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
- F24F2140/00—Control inputs relating to system states
- F24F2140/20—Heat-exchange fluid temperature
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
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- Physics & Mathematics (AREA)
- Fuzzy Systems (AREA)
- Mathematical Physics (AREA)
- Human Computer Interaction (AREA)
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- Air Conditioning Control Device (AREA)
Abstract
The invention belongs to the technical field of air conditioners, and particularly relates to an air conditioner unit and a defrosting control method thereof. The invention aims to solve the problem that the defrosting control method of the existing air conditioning unit is difficult to accurately judge the optimal time for the air conditioning unit to enter the defrosting mode. To this end, the defrosting control method of the present invention includes: acquiring the temperature of the outdoor coil under the condition that the current outdoor temperature is less than or equal to the preset outdoor temperature; if the temperature of the outdoor coil is less than or equal to the duration of the preset outdoor coil temperature and reaches the first preset duration, further acquiring the current of the outdoor fan; selectively acquiring the air outlet temperature of the outdoor unit according to the acquired current of the outdoor fan; and selectively enabling the air conditioning unit to operate in a defrosting mode according to the current outdoor temperature and the air outlet temperature of the outdoor unit, so that the air conditioning unit can enter the defrosting mode at the most proper time, and the heating effect of the air conditioning unit is effectively ensured.
Description
Technical Field
The invention belongs to the technical field of air conditioners, and particularly relates to an air conditioner unit and a defrosting control method thereof.
Background
The air conditioning unit comprises an indoor unit, an outdoor unit and a refrigerant circulation loop connected between the indoor unit and the outdoor unit, wherein the refrigerant continuously exchanges heat between the outdoor unit and the indoor unit through the refrigerant circulation loop. Taking an example when the air conditioning unit operates under a heating working condition, the coil pipe of the outdoor unit is always in a lower temperature state, and the outdoor temperature is also lower; at this time, if the outdoor environment has higher humidity, the coil of the outdoor unit is easy to generate frosting, and the heat exchange efficiency of the outdoor unit is also rapidly reduced along with continuous frosting, and the wind resistance is increased, so that the heating capacity of the whole air conditioning unit is continuously attenuated. Therefore, it is necessary to constantly monitor whether the coil of the outdoor unit has frosted during the operation of the air conditioning unit under the heating condition, and to select a proper time to enter the defrosting mode so as to avoid unnecessary energy loss.
When the existing air conditioning unit judges defrosting time, the judging modes of the existing air conditioning unit are not correspondingly distinguished according to different conditions of outdoor temperature, so that the problem of inaccurate judging results is easily caused. Specifically, when the air conditioning unit heats in an ultra-low temperature environment, the outdoor ambient temperature and humidity are often low, and the evaporation temperature is also low, thus causing a problem that it is difficult to accurately judge the frosting condition through the coil temperature. In other words, under the condition that the outdoor ambient temperature is very low and the humidity is very low, misjudgment is easy to occur to the air conditioning unit, so that the air conditioning unit enters unnecessary false defrosting, the heating performance of the air conditioning unit is frequently influenced, and the heat exchange efficiency of the air conditioning unit and the comfort level of a user are seriously influenced.
Accordingly, there is a need in the art for a new air conditioning unit and defrost control method thereof to solve the above-mentioned problems.
Disclosure of Invention
In order to solve the above problems in the prior art, that is, in order to solve the problem that it is difficult to accurately determine the best moment for an air conditioning unit to enter a defrosting mode in the defrosting control method of the existing air conditioning unit, the invention provides a defrosting control method of the air conditioning unit, wherein the air conditioning unit comprises an outdoor unit, the outdoor unit comprises an outdoor coil and an outdoor fan, and the defrosting control method comprises: acquiring the temperature of the outdoor coil under the condition that the current outdoor temperature is less than or equal to the preset outdoor temperature; if the temperature of the outdoor coil is less than or equal to the duration of the preset outdoor coil temperature and reaches the first preset duration, further acquiring the current of the outdoor fan; selectively acquiring the air outlet temperature of the outdoor unit according to the acquired current of the outdoor fan; and selectively enabling the air conditioning unit to operate in a defrosting mode according to the current outdoor temperature and the air outlet temperature of the outdoor unit.
In the preferred technical solution of the defrosting control method, the step of selectively obtaining the air outlet temperature of the outdoor unit according to the obtained current of the outdoor fan specifically includes: calculating the ratio of the current of the outdoor fan to the preset current, and recording the ratio as a first ratio; and if the first ratio is larger than a first preset ratio, acquiring the air outlet temperature of the outdoor unit.
In the preferred technical solution of the defrosting control method, the determining mode of the preset current is as follows: acquiring the current of the outdoor fan for a plurality of times within a second preset time period after the last defrosting is finished; and calculating the average value of the acquired currents of the outdoor fans to obtain the preset current.
In a preferred technical solution of the above defrosting control method, the control method further includes: further acquiring the duration of the heating operation of the air conditioning unit under the condition that the first ratio is smaller than or equal to the first preset ratio; and if the duration of the heating operation of the air conditioning unit reaches a third preset duration, enabling the air conditioning unit to operate in a defrosting mode.
In the preferred technical solution of the defrosting control method, the step of selectively operating the air conditioning unit in the defrosting mode according to the current outdoor temperature and the outlet air temperature of the outdoor unit specifically includes: calculating the ratio of the preset difference value to the difference value between the current outdoor temperature and the air outlet temperature of the outdoor unit, and recording the ratio as a second ratio; comparing the second ratio with a second preset ratio; and selectively enabling the air conditioning unit to operate in a defrosting mode according to a comparison result of the second ratio and the second preset ratio.
In the preferred technical solution of the defrosting control method, the step of selectively enabling the air conditioning unit to operate in a defrosting mode according to a comparison result of the second ratio and the second preset ratio specifically includes: and if the second ratio is larger than the second preset ratio, enabling the air conditioning unit to operate in a defrosting mode.
In the preferred technical solution of the defrosting control method, the step of selectively enabling the air conditioning unit to operate in a defrosting mode according to a comparison result of the second ratio and the second preset ratio specifically includes: if the second ratio is smaller than or equal to the second preset ratio, further acquiring the duration of the heating operation of the air conditioning unit; and if the duration of the heating operation of the air conditioning unit reaches a fourth preset duration, enabling the air conditioning unit to operate in a defrosting mode.
In the preferred technical scheme of the defrosting control method, the determining mode of the preset difference value is as follows: the air outlet temperature of the outdoor unit is acquired for multiple times and the outdoor temperature is acquired at least once within a fifth preset time period after the last defrosting is finished; and calculating the difference between the outdoor temperature and the obtained average value of the air outlet temperatures of the plurality of outdoor units, namely the preset difference.
In a preferred technical solution of the above defrosting control method, the defrosting control method further includes: when the temperature of the outdoor coil is greater than the preset outdoor coil temperature or the temperature of the outdoor coil is less than or equal to the duration of the preset outdoor coil temperature and does not reach the first preset duration, further acquiring the duration of the heating operation of the air conditioning unit; and if the duration of the heating operation of the air conditioning unit reaches a sixth preset duration, enabling the air conditioning unit to operate in a defrosting mode.
The invention also provides an air conditioning unit which comprises a controller, wherein the controller can execute the defrosting control method in any preferable technical scheme.
As can be appreciated by those skilled in the art, in the technical solution of the present invention, the air conditioning unit of the present invention includes an outdoor unit, the outdoor unit includes an outdoor coil and an outdoor fan, and the defrosting control method of the present invention includes: acquiring the temperature of the outdoor coil under the condition that the current outdoor temperature is less than or equal to the preset outdoor temperature; if the temperature of the outdoor coil is less than or equal to the duration of the preset outdoor coil temperature and reaches the first preset duration, further acquiring the current of the outdoor fan; selectively acquiring the air outlet temperature of the outdoor unit according to the acquired current of the outdoor fan; and selectively enabling the air conditioning unit to operate in a defrosting mode according to the current outdoor temperature and the air outlet temperature of the outdoor unit. The defrosting control method is particularly provided for the condition of low outdoor temperature, and the frosting condition of the outdoor unit can be accurately judged under the condition of ultralow temperature heating by using the defrosting control method, so that the air conditioning unit can enter a defrosting mode at the most proper time, the heating effect of the air conditioning unit is effectively ensured, and the running efficiency of the air conditioning unit and the heat exchange experience of a user are effectively improved. In addition, the air conditioning unit can acquire parameters by means of original electronic elements, namely, the defrosting control method can be carried out without adding other electronic elements when being carried out, so that the structure of the air conditioning unit is effectively ensured without any transformation, the manufacturing cost is not increased, and the air conditioning unit is very convenient to apply.
Drawings
FIG. 1 is a flow chart of the main steps of the defrost control method of the present invention;
fig. 2 is a detailed step flow chart of a preferred embodiment of the defrost control method of the present invention.
Detailed Description
Preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are merely for explaining the technical principles of the present invention, and are not intended to limit the scope of the present invention. Those skilled in the art can adapt it as desired to suit a particular application. For example, the air conditioning unit in the present invention may be one-to-one air conditioning unit or one-to-many multi-split air conditioning unit, and such changes of application objects do not deviate from the basic principles of the present invention and should fall within the protection scope of the present invention.
It should be noted that, in the description of the preferred embodiment, terms such as "inner", "outer", and the like, refer to directions or positional relationships based on the directions or positional relationships shown in the drawings, which are merely for convenience of description, and do not indicate or imply that the apparatus or elements must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the invention. In addition, the terms "first," second, "" third, "" fourth, "" fifth, "and sixth" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
Furthermore, in the description of the present invention, unless explicitly stated and limited otherwise, the term "coupled" is to be interpreted broadly, as for example, directly coupled, indirectly coupled through intervening media, and in communication between two elements. The specific meaning of the above terms in the present invention can be understood by those skilled in the art according to the specific circumstances. Although the various steps of the control method of the present invention are described in a particular order in this application, these orders are not limiting and one skilled in the art may perform the steps in a different order without departing from the basic principles of the invention.
Based on the problem that the defrosting control method of the existing air conditioning unit is difficult to accurately judge the best opportunity of the air conditioning unit to enter a defrosting mode, the invention provides a novel defrosting control method, and the defrosting control method can acquire the temperature of an outdoor coil when the current outdoor temperature is less than or equal to the preset outdoor temperature; if the temperature of the outdoor coil is less than or equal to the duration of the preset outdoor coil temperature and reaches the first preset duration, further acquiring the current of the outdoor fan; selectively acquiring the air outlet temperature of the outdoor unit according to the acquired current of the outdoor fan; and selectively enabling the air conditioning unit to operate in a defrosting mode according to the current outdoor temperature and the air outlet temperature of the outdoor unit, so that the air conditioning unit can enter the defrosting mode at the most proper time, and further the operation efficiency of the air conditioning unit is effectively improved.
Specifically, the air conditioning unit comprises an indoor unit and an outdoor unit, wherein an indoor coil is arranged in the indoor unit, an outdoor coil and an outdoor fan are arranged in the outdoor unit, and the indoor coil and the outdoor coil are connected through a refrigerant circulation loop to realize heat exchange, so that the effect of changing the room temperature is realized; the outdoor fan is arranged near the outdoor coil pipe so as to effectively improve the heat exchange efficiency of the outdoor coil pipe. It should be noted that, a person skilled in the art may set the specific structure of the air conditioning unit according to the actual use requirement, for example, the specific number of the indoor units, the specific type and the setting position of the outdoor fan, etc. Such changes in the specific structure of the air conditioning unit do not depart from the basic principles of the present invention and are intended to be within the scope of the present invention.
Further, the air conditioning unit further comprises an outdoor temperature sensor, an outdoor coil temperature sensor and an air outlet temperature sensor, wherein the outdoor temperature sensor can detect the outdoor temperature of the outdoor unit, the outdoor coil temperature sensor can detect the temperature of the outdoor coil, and the air outlet temperature sensor can detect the air outlet temperature of the outdoor unit. It should be noted that, the present invention does not limit the specific type, specific setting position and specific setting number of the above temperature sensor, and the technician can set the temperature sensor according to the actual use requirement; such changes do not depart from the basic principles of the invention and are intended to be within the scope thereof.
In addition, the air conditioning unit further comprises a controller, wherein the controller can acquire detection data of each sensor; specifically, the outdoor temperature of the outdoor unit is detected by the outdoor temperature sensor, the temperature of the outdoor coil is detected by the outdoor coil temperature sensor, and the air-out temperature of the outdoor unit is detected by the air-out temperature sensor. The controller may also be capable of controlling an operational mode of the air conditioning unit, for example, controlling a defrost mode of operation of the air conditioning unit.
It should be noted that, the present invention does not limit the specific operation executed after the air conditioning unit enters the defrosting mode, and the technician can set the operation according to the actual use requirement; for example, defrosting of the outdoor coil can be achieved by controlling the reversing of the four-way valve; for another example, defrosting of the outdoor coil may also be accomplished by means of an electric heater; also for example, different levels of defrost modes may be implemented by combining multiple defrost modes, none of which are limiting.
In addition, it is also understood by those skilled in the art that the present invention does not limit the specific structure and model of the controller, and the controller may be an original controller of the air conditioning unit, or may be a controller separately provided for executing the defrosting control method of the present invention, and the skilled person may set the structure and model of the controller according to the actual use requirement.
Referring first to fig. 1, a flow chart of main steps of the defrosting control method of the present invention is shown. As shown in fig. 1, based on the air conditioning unit described in the above embodiment, the defrosting control method of the present invention mainly includes the following steps:
s1: acquiring the temperature of the outdoor coil under the condition that the current outdoor temperature is less than or equal to the preset outdoor temperature;
s2: if the temperature of the outdoor coil is less than or equal to the duration of the preset outdoor coil temperature and reaches the first preset duration, further acquiring the current of the outdoor fan;
s3: selectively acquiring the air outlet temperature of the outdoor unit according to the acquired current of the outdoor fan;
s4: and selectively enabling the air conditioning unit to operate in a defrosting mode according to the current outdoor temperature and the air outlet temperature of the outdoor unit.
In step S1, in the case where the current outdoor temperature is equal to or less than the preset outdoor temperature, it is indicated that the air conditioning unit is operating the heating mode in an ultra-low temperature environment, and in this case, the controller can detect the temperature of the outdoor coil through the outdoor coil temperature sensor. It should be noted that, the specific value of the preset outdoor temperature is not limited in the present invention, and the skilled person can set the preset outdoor temperature according to the actual use requirement, preferably, the preset outdoor temperature can be set according to the local humidity condition. Further preferably, the preset outdoor temperature is set to-15 ℃.
In addition, it should be noted that the invention does not limit the specific way of obtaining the temperature of the outdoor coil, and the technician can set the temperature according to the actual use requirement; preferably, a plurality of outdoor coil temperature sensors are disposed on the outdoor coil, the temperatures of multiple points on the outdoor coil can be obtained through the plurality of outdoor coil temperature sensors, and based on the obtained temperatures of the plurality of coils, the controller can select one with the lowest temperature as the temperature of the outdoor coil, so that the temperature of one place on the heat exchange coil, which is most prone to frosting, is taken as the temperature of the outdoor coil.
Based on the obtained result in the step S1, in the step S2, if the controller determines that the temperature of the outdoor coil is less than or equal to the preset outdoor coil temperature for the duration of the preset outdoor coil temperature to reach the first preset duration, the controller further obtains the current of the outdoor fan; it should be noted that, the present invention does not limit the specific manner of the controller obtaining the current of the outdoor fan, and the technician can set the current according to the actual use requirement.
In addition, it should be noted that the present invention does not limit the specific values of the preset outdoor coil temperature and the first preset duration, and the technician can set the values according to the actual use requirements; preferably, the preset outdoor coil temperature is set to-20 ℃, and the first preset duration is set to 5min.
Based on the obtained result in step S2, in step S3, the controller may selectively obtain the air outlet temperature of the outdoor unit according to the obtained current of the outdoor fan; it should be noted that, the present invention does not limit the specific determination conditions used in the step, and a technician may set the determination conditions according to the actual use requirements, so long as the obtained current of the outdoor fan determines that the outdoor unit has a frosting risk, the air outlet temperature of the outdoor unit may be further obtained.
Further, in step S4, the controller may selectively operate the air conditioning unit in a defrost mode according to the current outdoor temperature and the outlet air temperature of the outdoor unit. It should be noted that, the present invention does not limit the specific judgment conditions used in the step, and a technician may set the specific judgment conditions according to the actual use requirements, for example, the present outdoor temperature and the air outlet temperature of the outdoor unit are controlled to operate the defrosting mode only when they exceed a certain range, or the present outdoor temperature and the air outlet temperature of the outdoor unit are controlled to operate the defrosting mode only when they satisfy a certain relation. The change of the specific control logic does not deviate from the basic principle of the present invention, and the present invention should be considered as long as the judging condition used in the step is to judge whether the outdoor unit has frosting phenomenon or not through the current outdoor temperature and the air outlet temperature of the outdoor unit, so that the air conditioning unit selectively operates in the defrosting mode.
Reference is now made to fig. 2, which is a detailed step flow diagram of a preferred embodiment of the defrost control method of the present invention. As shown in fig. 2, based on the air conditioning unit described in the above embodiment, a preferred embodiment of the defrosting control method of the present invention specifically includes the steps of:
s101: under the condition that the air conditioning unit operates in a heating mode, acquiring the current outdoor temperature;
s102: judging whether the current outdoor temperature is less than or equal to the preset outdoor temperature; if not, executing step S103; if yes, go to step S104;
s103: judging whether the air conditioning unit needs to operate a defrosting mode or not in a conventional defrosting judging mode;
s104: acquiring the temperature of an outdoor coil;
s105: judging whether the duration time of the temperature of the outdoor coil is less than or equal to the preset outdoor coil temperature reaches a first preset duration time or not; if not, executing step S106; if yes, go to step S108;
s106: acquiring the duration of the heating operation of the air conditioning unit;
s107: if the duration of the heating operation of the air conditioning unit reaches the sixth preset duration, the air conditioning unit is operated in a defrosting mode;
s108: acquiring the current of an outdoor fan;
s109: calculating the ratio of the current of the outdoor fan to the preset current, and recording the ratio as a first ratio;
s110: judging whether the first ratio is larger than a first preset ratio or not; if not, executing step S111; if yes, step S113 is performed;
s111: acquiring the duration of the heating operation of the air conditioning unit;
s112: if the duration of the heating operation of the air conditioning unit reaches a third preset duration, enabling the air conditioning unit to operate in a defrosting mode;
s113: acquiring the air outlet temperature of the outdoor unit;
s114: calculating the ratio of the preset difference value to the difference value between the current outdoor temperature and the air outlet temperature of the outdoor unit, and recording the ratio as a second ratio;
s115: judging whether the second ratio is larger than a second preset ratio or not; if not, then step S116 is performed; if yes, go to step S118;
s116: acquiring the duration of the heating operation of the air conditioning unit;
s117: if the duration of the heating operation of the air conditioning unit reaches the fourth preset duration, the air conditioning unit is operated in a defrosting mode;
s118: the air conditioning unit is operated in a defrost mode.
In step S101, in the case where the air conditioning unit operates the heating mode, the controller can acquire a current outdoor temperature through the outdoor temperature sensor; it should be noted that the acquisition mode is not limited, and a technician can set the acquisition mode according to the actual use requirement; for example, the current outdoor temperature may also be obtained by networking.
Next, in step S102, the controller can determine whether the current outdoor temperature acquired in step S101 is less than or equal to the preset outdoor temperature, so as to determine whether the outdoor unit is operated in an ultralow temperature environment. It should be noted that, the specific value of the preset outdoor temperature is not limited in the present invention, and the skilled person can set the preset outdoor temperature according to the actual use requirement, preferably, the preset outdoor temperature can be set according to the local humidity condition. Further preferably, the preset outdoor temperature is set to-15 ℃.
Based on the determination result of step S102, if the current outdoor temperature is greater than the preset outdoor temperature, step S103 is performed, that is, the controller can determine whether the air conditioning unit needs to operate the defrosting mode through a conventional defrosting determination manner. It should be noted that the present invention does not limit any judgment mode involved in the step, and a technician can set the judgment mode according to actual use requirements; for example, the temperature of the outdoor coil is directly determined, or the temperature of the air outlet is directly determined.
Based on the determination result of step S102, if the current outdoor temperature is less than or equal to the preset outdoor temperature, step S104 is performed, i.e., the controller can detect the temperature of the outdoor coil through the outdoor coil temperature sensor. It should be noted that the invention does not limit the specific way of obtaining the temperature of the outdoor coil, and the technician can set the temperature according to the actual use requirement; preferably, a plurality of outdoor coil temperature sensors are disposed on the outdoor coil, the temperatures of multiple points on the outdoor coil can be obtained through the plurality of outdoor coil temperature sensors, and based on the obtained temperatures of the plurality of coils, the controller can select one with the lowest temperature as the temperature of the outdoor coil, so that the temperature of one place on the heat exchange coil, which is most prone to frosting, is taken as the temperature of the outdoor coil.
Next, in step S105, the controller can determine whether the duration of the temperature of the outdoor coil being equal to or less than the preset outdoor coil temperature reaches the first preset duration. It should be noted that, the present invention does not limit the specific values of the preset outdoor coil temperature and the first preset duration, and the technician can set the values according to the actual use requirements; preferably, the preset outdoor coil temperature is set to-20 ℃, and the first preset duration is set to 5min.
Based on the determination result in step S105, if the temperature of the outdoor coil is greater than the preset outdoor coil temperature, or the duration of the temperature of the outdoor coil is less than or equal to the preset outdoor coil temperature and does not reach the first preset duration, step S106 is executed, that is, the controller further obtains the duration of the heating operation of the air conditioning unit, so that on the basis of avoiding the occurrence of the false defrosting phenomenon, the problem that the air conditioning unit does not defrost in time can be effectively avoided. Based on this, in step S108, if the duration of the current heating operation of the air conditioning unit reaches the sixth preset duration, the air conditioning unit is operated in a defrosting mode; otherwise, the defrost mode is not operated. It should be noted that, the specific value of the sixth preset duration is not limited in the present invention, and a technician can set the value according to the actual use requirement; preferably, the sixth preset time period is set to 3 hours.
Based on the determination result in step S105, if the duration of the temperature of the outdoor coil is less than or equal to the preset outdoor coil temperature and reaches the first preset duration, step S108 is executed, that is, the controller further obtains the current of the outdoor fan; it should be noted that, the present invention does not limit the specific manner of the controller obtaining the current of the outdoor fan, and the technician can set the current according to the actual use requirement.
Further, in step S109, the controller may calculate a ratio of the current of the outdoor fan to the preset current, and record the ratio as a first ratio. As a preferable setting mode, the controller can acquire the current of the outdoor fan for a plurality of times within a second preset time period after the last defrosting of the air conditioning unit is finished, and calculate an average value of the plurality of currents, namely the preset current; of course, the preset current may also be a set fixed value. Preferably, the second preset time period is set to 3min, that is, within 3min after the last defrosting of the air conditioning unit is finished, the controller can obtain the current of the outdoor fan for multiple times, and calculate an average value of the multiple currents, that is, the preset current. In addition, the specific value of the second preset duration and the number of times of obtaining the current of the outdoor fan can be set by a technician according to the actual use requirement, which is not limitative.
Further preferably, the current of the outdoor fan adopted in the step is also an average value of multiple values within a second preset duration range before the current time, taking the second preset duration set to be 3min as an example, and the current of the outdoor fan is an average value of the current of the outdoor fan within 3min before the current time, and of course, a technician can set the acquisition times when calculating the average value according to the actual use requirement.
Next, in step S110, the controller can determine whether the first ratio is greater than the first preset ratio, so as to perform different operations accordingly. It should be noted that, the present invention does not limit the value of the first preset ratio; as a preferable setting value, the first preset ratio is set to 1.04 so as to improve the accuracy of judgment to the greatest extent.
Based on the judgment result of the step S110, if the first ratio is smaller than or equal to the first preset ratio, step S111 is executed, that is, the controller further obtains the duration of the current heating operation of the air conditioning unit, and based on this, in step S112, if the duration of the current heating operation of the air conditioning unit reaches the third preset duration, the air conditioning unit is enabled to operate in a defrosting mode; otherwise, the defrost mode is not operated. It should be noted that, the specific value of the third preset duration is not limited in the invention, and the technician can set the value according to the actual use requirement; preferably, the third preset duration is smaller than the sixth preset duration.
Based on the determination result of step S110, if the first ratio is greater than the first preset ratio, step S113 is performed, that is, the controller further obtains the air outlet temperature of the outdoor unit.
Further, in step S114, the controller calculates a ratio of the preset difference to a difference between the current outdoor temperature and the outlet air temperature of the outdoor unit, and records the ratio as a second ratio. As a preferred setting manner, the controller may obtain the air outlet temperature of the outdoor unit and obtain the outdoor temperature at least once more than once within a fifth preset time period after the last defrosting of the air conditioning unit is completed, and calculate a difference between the outdoor temperature and an average value of the air outlet temperatures of the plurality of outdoor units, that is, the preset difference. If the outdoor temperature is obtained only once within the fifth preset time period after the last defrosting of the air conditioning unit is finished, calculating the difference value between the outdoor temperature and the average value of the air outlet temperatures of the plurality of outdoor units; and if the outdoor temperatures are acquired for a plurality of times within a fifth preset time period after the last defrosting of the air conditioning unit is finished, calculating the difference value between the average value of the outdoor temperatures and the average value of the air outlet temperatures of the outdoor units. Preferably, the fifth preset duration is set to 10min, that is, within 10min after the last defrosting of the air conditioning unit is finished, the controller can acquire the air outlet temperature of the outdoor unit and acquire the outdoor temperature at least once for multiple times, and calculate the difference between the outdoor temperature and the average value of the air outlet temperatures of the outdoor units, that is, the preset difference. In addition, the specific value of the fifth preset duration and the number of times of obtaining the air outlet temperature of the outdoor unit may be set by a technician according to the actual use requirement, which is not limited.
Further preferably, the air outlet temperature of the outdoor unit adopted in the step is also an average value of multiple values within a preset time range before the current time, preferably an average value within 3min is adopted, that is, the air outlet temperature of the outdoor unit is an average value of the air outlet temperature of the outdoor unit within 3min before the current time, firstly, a difference value between the current outdoor temperature and the average value of the air outlet temperature is calculated, and then, a ratio of the preset difference value to the difference value is calculated and is recorded as a second ratio. Of course, the technician can set the acquisition times when calculating the average value according to the actual use requirement.
Next, in step S115, the controller can determine whether the second ratio is greater than the second preset ratio, so as to perform different operations accordingly. It should be noted that, the present invention does not limit the value of the second preset ratio; as a preferable setting value, the second preset ratio is set to 2 so as to improve the accuracy of judgment to the greatest extent.
Based on the judgment result in the step S115, if the second ratio is smaller than or equal to the second preset ratio, executing a step S116, that is, the controller further obtains the duration of the current heating operation of the air conditioning unit, and based on this, in a step S117, if the duration of the current heating operation of the air conditioning unit reaches the fourth preset duration, operating the air conditioning unit in a defrosting mode; otherwise, the defrost mode is not operated. It should be noted that, the present invention does not limit the specific value of the fourth preset duration, and the technician can set the value according to the actual use requirement; preferably, the fourth preset duration is smaller than the third preset duration.
Based on the determination result of step S115, if the second ratio is greater than the second preset ratio, step S118 is performed, that is, the controller can enable the air conditioning unit to operate in a defrosting mode, so that on the basis of avoiding occurrence of a false defrosting phenomenon, the problem that the air conditioning unit does not defrost in time can be effectively avoided
Thus far, the technical solution of the present invention has 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 protection of the present invention is not limited to only these specific embodiments. Equivalent modifications and substitutions for related technical features may be made by those skilled in the art without departing from the principles of the present invention, and such modifications and substitutions will fall within the scope of the present invention.
Claims (8)
1. A defrost control method of an air conditioner unit including an outdoor coil and an outdoor fan, the defrost control method comprising:
acquiring the temperature of the outdoor coil under the condition that the current outdoor temperature is less than or equal to the preset outdoor temperature;
if the temperature of the outdoor coil is less than or equal to the duration of the preset outdoor coil temperature and reaches the first preset duration, further acquiring the current of the outdoor fan;
selectively acquiring the air outlet temperature of the outdoor unit according to the acquired current of the outdoor fan;
selectively enabling the air conditioning unit to operate in a defrosting mode according to the current outdoor temperature and the air outlet temperature of the outdoor unit;
the step of selectively obtaining the air outlet temperature of the outdoor unit according to the obtained current of the outdoor fan specifically includes:
calculating the ratio of the current of the outdoor fan to the preset current, and recording the ratio as a first ratio;
if the first ratio is larger than a first preset ratio, acquiring the air outlet temperature of the outdoor unit;
the control method further includes:
further acquiring the duration of the heating operation of the air conditioning unit under the condition that the first ratio is smaller than or equal to the first preset ratio;
and if the duration of the heating operation of the air conditioning unit reaches a third preset duration, enabling the air conditioning unit to operate in a defrosting mode.
2. The defrosting control method as set forth in claim 1, wherein the preset current is determined in the following manner:
acquiring the current of the outdoor fan for a plurality of times within a second preset time period after the last defrosting is finished;
and calculating the average value of the acquired currents of the outdoor fans to obtain the preset current.
3. The defrosting control method according to claim 1 or 2, characterized in that the step of selectively operating the air conditioning unit in the defrosting mode according to the current outdoor temperature and the outlet air temperature of the outdoor unit specifically includes:
calculating the ratio of the preset difference value to the difference value between the current outdoor temperature and the air outlet temperature of the outdoor unit, and recording the ratio as a second ratio;
comparing the second ratio with a second preset ratio;
and selectively enabling the air conditioning unit to operate in a defrosting mode according to a comparison result of the second ratio and the second preset ratio.
4. The defrosting control method as set forth in claim 3, wherein the step of selectively operating the air conditioning unit in the defrosting mode according to a comparison result of the second ratio with the second preset ratio specifically includes:
and if the second ratio is larger than the second preset ratio, enabling the air conditioning unit to operate in a defrosting mode.
5. The defrosting control method as set forth in claim 4, wherein the step of selectively operating the air conditioning unit in the defrosting mode according to a comparison result of the second ratio with the second preset ratio specifically includes:
if the second ratio is smaller than or equal to the second preset ratio, further acquiring the duration of the heating operation of the air conditioning unit;
and if the duration of the heating operation of the air conditioning unit reaches a fourth preset duration, enabling the air conditioning unit to operate in a defrosting mode.
6. The defrosting control method as set forth in claim 3, wherein the preset difference is determined in the following manner:
the air outlet temperature of the outdoor unit is acquired for multiple times and the outdoor temperature is acquired at least once within a fifth preset time period after the last defrosting is finished;
and calculating the difference between the outdoor temperature and the obtained average value of the air outlet temperatures of the plurality of outdoor units, namely the preset difference.
7. The defrosting control method as set forth in claim 1, further comprising:
when the temperature of the outdoor coil is greater than the preset outdoor coil temperature or the temperature of the outdoor coil is less than or equal to the duration of the preset outdoor coil temperature and does not reach the first preset duration, further acquiring the duration of the heating operation of the air conditioning unit;
and if the duration of the heating operation of the air conditioning unit reaches a sixth preset duration, enabling the air conditioning unit to operate in a defrosting mode.
8. An air conditioning unit comprising a controller capable of executing the defrost control method according to any one of claims 1 to 7.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
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| CN202110426600.4A CN113124544B (en) | 2021-04-20 | 2021-04-20 | Air conditioning unit and defrosting control method thereof |
| PCT/CN2022/087808 WO2022222940A1 (en) | 2021-04-20 | 2022-04-20 | Air conditioning unit and defrosting control method therefor |
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| CN202110426600.4A CN113124544B (en) | 2021-04-20 | 2021-04-20 | Air conditioning unit and defrosting control method thereof |
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| CN113124544B true CN113124544B (en) | 2023-04-25 |
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| CN113124544B (en) * | 2021-04-20 | 2023-04-25 | 青岛海尔空调电子有限公司 | Air conditioning unit and defrosting control method thereof |
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| WO2022222940A1 (en) | 2022-10-27 |
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