CN113375288A - Defrosting control method for air conditioning unit - Google Patents
Defrosting control method for air conditioning unit Download PDFInfo
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- CN113375288A CN113375288A CN202110530254.4A CN202110530254A CN113375288A CN 113375288 A CN113375288 A CN 113375288A CN 202110530254 A CN202110530254 A CN 202110530254A CN 113375288 A CN113375288 A CN 113375288A
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- 238000010257 thawing Methods 0.000 title claims abstract description 461
- 238000004378 air conditioning Methods 0.000 title claims abstract description 150
- 238000000034 method Methods 0.000 title claims abstract description 42
- 230000003247 decreasing effect Effects 0.000 claims description 4
- 238000012986 modification Methods 0.000 description 30
- 230000004048 modification Effects 0.000 description 30
- 238000012937 correction Methods 0.000 description 17
- 238000010438 heat treatment Methods 0.000 description 12
- 239000003507 refrigerant Substances 0.000 description 8
- 230000000694 effects Effects 0.000 description 5
- 238000006467 substitution reaction Methods 0.000 description 2
- 238000004891 communication Methods 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
- F24F11/62—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
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Abstract
The invention belongs to the technical field of air conditioners, and particularly relates to a defrosting control method for an air conditioning unit. The invention aims to solve the problem that the existing air conditioning unit is easy to misjudge when the existing air conditioning unit judges by using fixed preset coil temperature and defrosting interval time. To this end, the defrost control method of the present invention comprises: acquiring the time length of the last outdoor unit defrosting mode operation of the air conditioning unit under the condition that the times of the outdoor unit defrosting mode operation of the air conditioning unit after the air conditioning unit is started at this time exceed the preset times; if the last time of the air conditioning unit for operating the outdoor unit defrosting mode is shorter than a first preset time or longer than a second preset time, correcting the preset defrosting interval time and/or the preset defrosting coil temperature used in the last defrosting judgment; and judging the time when the air conditioning unit enters the outdoor unit defrosting mode at this time according to the corrected preset defrosting coil temperature and/or the preset defrosting interval time so as to effectively determine the optimal time for entering the outdoor unit defrosting mode.
Description
Technical Field
The invention belongs to the technical field of air conditioners, and particularly relates to a defrosting control method for an air conditioning unit.
Background
When the air conditioning unit operates in a heating working condition under a low-temperature environment, the frosting phenomenon easily occurs to the outdoor heat exchanger, and when the frosting phenomenon is serious, the heat exchange between the outdoor heat exchanger and the outdoor environment is influenced, so that the heating effect is reduced, and at the moment, the defrosting is required to be performed in time. Many existing defrosting control methods determine the difference between the coil temperature of the outdoor heat exchanger and the outdoor ambient temperature, for example, when the difference exceeds a certain threshold and the time interval between two defrosts exceeds a preset time, defrosting is performed. Of course, in some cases, other judgment conditions may be added to judge the defrosting entry time; however, when other parameters are adopted for judgment, the judgment is easily influenced by many irrelevant factors, so that the judgment is inaccurate, and the judgment is carried out by adopting the most common coil temperature and defrosting interval time, so that the method has the advantage of being easy to realize. When the air conditioning unit defrosts, the four-way valve is reversed, the indoor heat exchanger is used as an evaporator, the outdoor heat exchanger is used as a condenser, and the heating effect of the indoor heat exchanger is dissipated, so that the heating efficiency of the indoor heat exchanger is greatly influenced by defrosting time and defrosting efficiency.
Specifically, the defrosting interval time is a time difference between the last defrosting completion and the next entering of the defrosting mode, the defrosting time is a defrosting time between the entering of the outdoor unit into the defrosting mode and the exiting of the defrosting mode, and the sum of the defrosting interval time and the defrosting time is one defrosting period. The defrosting interval time is one of the key conditions for judging the defrosting time, and if the defrosting interval time is too short, unnecessary frequent defrosting can occur, and even false defrosting can occur; if the defrosting interval time is too long, the problem that frosting is serious and the defrosting is not in time can occur, under the condition, the heat transmitted to the indoor by the indoor heat exchanger is influenced, the indoor temperature cannot be timely increased, and long defrosting time is consumed due to too much frosting after the indoor heat exchanger enters the defrosting mode, so that the indoor heating effect is further reduced. In addition, the defrosting target temperature is also one of the key conditions for judging the defrosting time, and in the prior art, the defrosting target temperature is usually calculated by correlating with the outdoor temperature and then compared with a fixed threshold value to judge the defrosting time. If the defrosting time is not accurately judged, the running time of the defrosting mode is short under the condition of false defrosting or little frosting, even the defrosting mode can be quitted quickly just after entering the defrosting mode, and the running state of the air conditioning unit needs to be frequently switched, so that the heating effect is influenced, and the protection of the unit is not facilitated; when the frosting condition is serious, a long defrosting time can be consumed, and the residual frost is still not dissolved.
Accordingly, there is a need in the art for a new defrost control method for an air conditioning unit that addresses the above-mentioned problems.
Disclosure of Invention
In order to solve the above problems in the prior art, that is, to solve the problem that the conventional air conditioning unit is prone to erroneous judgment when the conventional air conditioning unit uses a fixed preset coil temperature and a fixed defrosting interval time for judgment, the present invention provides a defrosting control method for an air conditioning unit, wherein the defrosting control method includes: acquiring the time length of the last outdoor unit defrosting mode operation of the air conditioning unit under the condition that the times of the outdoor unit defrosting mode operation of the air conditioning unit after the air conditioning unit is started at this time exceed the preset times; if the last time of the air conditioning unit for operating the outdoor unit defrosting mode is shorter than a first preset time or longer than a second preset time, correcting the preset defrosting interval time and/or the preset defrosting coil temperature used in the last defrosting judgment; judging the time when the air conditioning unit enters the outdoor unit defrosting mode at this time according to the corrected preset defrosting coil temperature and/or the preset defrosting interval time; the first preset time length is less than the second preset time length.
In a preferred technical solution of the above-mentioned defrosting control method, if the last time the air conditioning unit operates the outdoor unit defrosting mode is shorter than a first preset time or longer than a second preset time, the step of correcting the preset defrosting interval time and/or the preset defrosting coil temperature used in the last defrosting judgment includes: and if the last time of the air conditioning unit for operating the outdoor unit defrosting mode is shorter than the first preset time, increasing the preset defrosting interval time used in the last defrosting judgment, and/or reducing the temperature of the preset defrosting coil used in the last defrosting judgment.
In a preferred technical solution of the above defrosting control method, if a last time period for operating the outdoor unit defrosting mode of the air conditioning unit is shorter than the first preset time period, the step of increasing the preset defrosting interval time used in the last defrosting judgment and/or decreasing the preset defrosting coil temperature used in the last defrosting judgment includes: and if the last time of the air conditioning unit for operating the outdoor unit defrosting mode is shorter than the first preset time and longer than or equal to a third preset time, only increasing the preset defrosting interval time used in the last defrosting judgment.
In a preferred technical solution of the above defrosting control method, if a last time period for operating the outdoor unit defrosting mode of the air conditioning unit is shorter than the first preset time period, the step of increasing the preset defrosting interval time used in the last defrosting judgment and/or decreasing the preset defrosting coil temperature used in the last defrosting judgment includes: and if the last time of the air conditioning unit for operating the outdoor unit defrosting mode is shorter than the third preset time, increasing the preset defrosting interval time used in the last defrosting judgment, and reducing the temperature of the preset defrosting coil used in the last defrosting judgment.
In a preferred technical solution of the above-mentioned defrosting control method, if the last time the air conditioning unit operates the outdoor unit defrosting mode is shorter than a first preset time or longer than a second preset time, the step of correcting the preset defrosting interval time and/or the preset defrosting coil temperature used in the last defrosting judgment further includes: and if the time length of the last time of the air conditioning unit for operating the outdoor unit defrosting mode is longer than the second preset time length, reducing the preset defrosting interval time used in the last defrosting judgment, and/or increasing the temperature of the preset defrosting coil used in the last defrosting judgment.
In a preferred technical solution of the above-mentioned defrosting control method, if the last time that the outdoor unit defrosting mode was operated by the air conditioning unit is longer than the second preset time, the step of reducing the preset defrosting interval time used in the last defrosting judgment and/or increasing the preset defrosting coil temperature used in the last defrosting judgment includes: and if the time length of the last time of the air conditioning unit for operating the outdoor unit defrosting mode is longer than the second preset time length and is shorter than or equal to a fourth preset time length, only reducing the preset defrosting interval time used in the last defrosting judgment.
In a preferred technical solution of the above defrosting control method, if the last time that the outdoor unit defrosting mode was operated by the air conditioning unit is longer than the second preset time, the step of reducing the preset defrosting interval time used in the last defrosting judgment and/or increasing the preset defrosting coil temperature used in the last defrosting judgment further includes: and if the last time of the air conditioning unit for operating the outdoor unit defrosting mode is longer than the fourth preset time and shorter than or equal to the fifth preset time, reducing the preset defrosting interval time used in the last defrosting judgment, and increasing the temperature of the preset defrosting coil used in the last defrosting judgment.
In the preferred technical solution of the above-mentioned defrosting control method, the step of "determining the opportunity for the air conditioning unit to enter the outdoor unit defrosting mode this time according to the corrected preset defrosting coil temperature and/or the preset defrosting interval time" further includes: acquiring the temperature of an outdoor coil of the air conditioning unit and the time length from the end of the last outdoor unit defrosting mode; under the condition that only the preset defrosting coil temperature is corrected, if the acquired outdoor coil temperature is less than or equal to the corrected preset defrosting coil temperature and the acquired duration is greater than or equal to the preset defrosting interval time, controlling the air conditioning unit to enter an outdoor unit defrosting mode; under the condition that only the preset defrosting interval time is corrected, if the acquired outdoor coil temperature is less than or equal to the preset defrosting coil temperature and the acquired duration is greater than or equal to the corrected preset defrosting interval time, controlling the air conditioning unit to enter an outdoor unit defrosting mode; and under the condition that the preset defrosting coil temperature and the preset defrosting interval time are both corrected, if the acquired outdoor coil temperature is less than or equal to the corrected preset defrosting coil temperature and the acquired duration is greater than or equal to the corrected preset defrosting interval time, controlling the air conditioning unit to enter an outdoor unit defrosting mode.
In the preferable technical scheme of the defrosting control method, the correction range of the preset defrosting coil temperature is from-25 ℃ to-1 ℃; and/or the preset defrost interval time is corrected in a range of 30 minutes to 240 minutes.
In a preferred technical solution of the above defrosting control method, the preset number of times is two.
As can be understood by those skilled in the art, in a preferred embodiment of the present invention, the defrost control method of the present invention includes: acquiring the time length of the last outdoor unit defrosting mode operation of the air conditioning unit under the condition that the times of the outdoor unit defrosting mode operation of the air conditioning unit after the air conditioning unit is started at this time exceed the preset times; if the last time of the air conditioning unit for operating the outdoor unit defrosting mode is shorter than a first preset time or longer than a second preset time, correcting the preset defrosting interval time and/or the preset defrosting coil temperature used in the last defrosting judgment; judging the time when the air conditioning unit enters the outdoor unit defrosting mode at this time according to the corrected preset defrosting coil temperature and/or the preset defrosting interval time; the first preset time length is less than the second preset time length. Based on the control mode, the invention can dynamically correct the preset defrosting interval time and/or the preset defrosting coil temperature based on the time length of the last time the outdoor unit defrosting mode is operated by the air conditioning unit, so that the judgment condition can be always closely attached to the current situation, the optimal time for entering the outdoor unit defrosting mode can be effectively determined, and defrosting can be realized within the most reasonable time length range, thereby effectively avoiding the problems of false defrosting or incomplete defrosting after entering the outdoor unit defrosting mode, and further ensuring the heating effect of the air conditioning unit to the maximum extent.
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 diagram of a preferred embodiment of the present invention.
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. And can be adjusted as needed by those skilled in the art to suit particular applications. For example, the air conditioning unit in the invention can be a one-driving-one household air conditioner or a one-driving-more central air conditioner; such changes as to the specific type of air conditioning unit do not depart from the basic concept of the present invention and are intended to be within the scope of the present invention.
It should be noted that in the description of the preferred embodiment, the terms of direction or positional relationship indicated by the terms "inside", "outside", and the like are based on the directions or positional relationships shown in the drawings, which are only for convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention. In addition, in the description of the present invention, unless otherwise explicitly specified or limited, the term "connected" is to be understood broadly, and may be, for example, directly connected, indirectly connected through an intermediate, or communicating between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
Further, it should be noted that in the description of the present invention, although the steps of the control method of the present invention are described in a specific order in the present application, the order is not limited, and those skilled in the art may perform the steps in a different order without departing from the basic principle of the present invention.
The air conditioning unit comprises an indoor unit and an outdoor unit, wherein a refrigerant circulation loop is arranged between the indoor unit and the outdoor unit, a refrigerant for exchanging heat indoors and outdoors flows through the refrigerant circulation loop, and an indoor coil, a compressor, a four-way valve, an outdoor coil and an electronic expansion valve are arranged on the refrigerant circulation loop; the indoor coil is arranged in the indoor unit, the outdoor coil is arranged in the outdoor unit, a refrigerant is continuously circulated between the indoor coil and the outdoor coil through the refrigerant circulation loop to realize heat exchange, and the reverse circulation of the refrigerant in the refrigerant circulation loop can be controlled when the four-way valve is reversed, so that the air conditioning unit is switched between a refrigerating working condition and a heating working condition. It should be noted that, the present invention does not limit the specific structure of the air conditioning unit, and the technician can set the structure according to the actual use requirement.
Further, the air conditioning unit of the present invention further includes an outdoor coil temperature sensor and a controller, wherein the outdoor coil temperature sensor is capable of detecting the temperature of the outdoor coil, the controller is capable of acquiring the detection data of the outdoor coil temperature sensor, and the controller is also capable of controlling the operation state of the air conditioning unit, for example, controlling the communication state of the four-way valve. It can be 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 the original controller of the air conditioning unit, or may be a controller separately configured to execute the defrosting control method of the present invention, and the structure and model of the controller can be set by the skilled person according to the actual use requirement.
Referring first to fig. 1, a flow chart of the main steps of the defrost 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 time length of the last outdoor unit defrosting mode operation of the air conditioning unit under the condition that the times of the outdoor unit defrosting mode operation of the air conditioning unit after the air conditioning unit is started at this time exceed the preset times;
s2: if the last time of the air conditioning unit for operating the outdoor unit defrosting mode is shorter than a first preset time or longer than a second preset time, correcting the preset defrosting interval time and/or the preset defrosting coil temperature used in the last defrosting judgment;
s3: and judging the time when the air conditioning unit enters the outdoor unit defrosting mode at this time according to the corrected preset defrosting coil temperature and/or the preset defrosting interval time.
Further, in step S1, when the number of times that the outdoor unit defrosting mode is operated after the air conditioning unit is started this time exceeds the preset number of times, that is, when the number of times that the outdoor unit defrosting mode is operated by the air conditioning unit exceeds the preset number of times after the air conditioning unit is started this time, of course, the present invention does not limit the specific operations performed when the air conditioning unit operates the defrosting mode at all, and a technician can set the operation according to actual needs as long as the outdoor unit can be defrosted, and preferably, the defrosting is realized by controlling the four-way valve to reverse.
It should be noted that, the specific value of the preset times is not limited, and a technician can set the specific value according to actual use requirements, so long as the air conditioning unit can enter a stable operation state after operating in the defrosting mode for the preset times; preferably, the preset times are two times, so that the accuracy and timeliness of defrosting operation are effectively guaranteed. In this case, the time length of the last time the outdoor unit defrosting mode is operated by the air conditioning unit is obtained, and a technician can set the obtaining mode according to actual conditions.
Further, in step S2, if the last time the outdoor unit defrosting mode was operated by the air conditioning unit is shorter than the first preset time or longer than the second preset time, the preset defrosting interval time and/or the preset defrosting coil temperature used in the last defrosting judgment are/is corrected, where the first preset time is shorter than the second preset time.
It should be noted that, in the present invention, specific values of the first preset time period and the second preset time period are not limited, and a technician may set the values according to actual needs, as long as the first preset time period is shorter than the second preset time period; the present invention does not limit the specific modification manner, and it is within the protection scope of the present invention to modify the preset defrosting interval time and/or the preset defrosting coil temperature used in the last defrosting judgment as long as the last time period for operating the outdoor unit defrosting mode of the air conditioning unit is shorter than the first preset time period or longer than the second preset time period.
Further, in step S3, after the correction in step S2, the controller may determine the timing at which the air conditioning unit enters the outdoor unit defrosting mode at this time according to the corrected preset defrosting coil temperature and/or the preset defrosting interval time. Specifically, under the condition that only the preset defrosting coil temperature is corrected, the time when the air conditioning unit enters the outdoor unit defrosting mode at this time is judged according to the corrected preset defrosting coil temperature and the uncorrected preset defrosting interval time; under the condition that only the preset defrosting interval time is corrected, judging the time when the air conditioning unit enters the outdoor unit defrosting mode at this time according to the uncorrected preset defrosting coil temperature and the corrected preset defrosting interval time; and under the condition that the preset defrosting coil temperature and the preset defrosting interval time are both corrected, judging the time when the air conditioning unit enters the outdoor unit defrosting mode at this time according to the corrected preset defrosting coil temperature and the corrected preset defrosting interval time. It should be noted that, the present invention does not limit the specific determination conditions, and it is within the protection scope of the present invention that the time when the air conditioning unit enters the outdoor unit defrosting mode at this time is determined according to the corrected preset defrosting coil temperature and/or the preset defrosting interval time.
Referring next to fig. 2, a flowchart detailing the steps of a preferred embodiment of the present invention is shown. As shown in fig. 2, based on the air conditioning unit described in the foregoing embodiment, a preferred embodiment of the defrosting control method of the present invention specifically includes the following steps:
s101: after the air conditioning unit starts the heating working condition, acquiring the temperature and the running time of an outdoor coil;
s102: if the temperature of the outdoor coil is less than or equal to the preset defrosting coil temperature and the running time is more than or equal to the preset defrosting interval time, controlling the air conditioning unit to enter an outdoor unit defrosting mode for the first time;
s103: after the air conditioning unit exits the outdoor unit defrosting mode for the first time, the temperature of the outdoor coil and the time length from the end of the first outdoor unit defrosting mode are obtained again;
s104: if the temperature of the outdoor coil acquired again is less than or equal to the preset defrosting coil temperature and the acquired duration is greater than or equal to the preset defrosting interval time, controlling the air conditioning unit to enter an outdoor unit defrosting mode for the second time;
s105: after the air conditioning unit exits the outdoor unit defrosting mode for the second time, acquiring the time length for the air conditioning unit to operate the outdoor unit defrosting mode for the second time;
s106: if the time length is less than a third preset time length, increasing the preset defrosting interval time used in the last defrosting judgment, and reducing the temperature of the preset defrosting coil used in the last defrosting judgment;
s107: if the time length is less than the first preset time length and greater than or equal to a third preset time length, only increasing the preset defrosting interval time used in the last defrosting judgment;
s108: if the time length is greater than or equal to a first preset time length and less than or equal to a second preset time length, not correcting the preset defrosting interval time and the preset defrosting coil temperature used in the last defrosting judgment;
s109: if the time length is longer than the second preset time length and is shorter than or equal to the fourth preset time length, only reducing the preset defrosting interval time used in the last defrosting judgment;
s110: if the time length is longer than the fourth preset time length and shorter than or equal to the fifth preset time length, reducing the preset defrosting interval time used in the last defrosting judgment, and increasing the temperature of the preset defrosting coil used in the last defrosting judgment;
s111: acquiring the temperature of the outdoor coil of the air conditioning unit and the time length from the end of the second outdoor unit defrosting mode;
s112: and judging the time when the air conditioning unit enters the outdoor unit defrosting mode at this time according to the determined preset defrosting coil temperature and the preset defrosting interval time.
Firstly, it should be noted that, in the preferred embodiment, the case where the preset number of times is two is explained, and a large number of tests prove that various parameters of most air conditioning units are easily affected by various unstable factors in the process of the first two defrosting determinations after starting, so that in the process of the first two defrosting determinations after starting, the preset defrosting coil temperature and the preset defrosting interval time are not corrected, but are directly judged by using the fixed preset defrosting coil temperature and the preset defrosting interval time; of course, the specific value of the preset times can be adjusted by the technical staff according to the actual use requirement.
In step S101, after the air conditioning unit starts a heating condition, the temperature and the operation duration of the outdoor coil, that is, the operation duration after the air conditioning unit is started, are obtained, so as to effectively determine a time when the air conditioning unit enters the outdoor unit defrosting mode for the first time after the air conditioning unit is started. It should be noted that the present invention does not limit the specific mode of the heating operation, and the heating operation is performed as long as the indoor coil is used as the condenser and the outdoor coil is used as the evaporator.
Based on the obtaining result of the step S101, in a step S102, if the obtained outdoor coil temperature is less than or equal to the preset defrosting coil temperature and the operation duration is greater than or equal to the preset defrosting interval time, controlling the air conditioning unit to enter an outdoor unit defrosting mode for the first time; it should be noted that, the specific values of the preset defrosting coil temperature and the preset defrosting interval time are not limited in the present invention, and the technical personnel can set the values according to the actual use requirements.
Then, in step S103, after the air conditioning unit exits from the outdoor unit defrosting mode for the first time, the specific determination condition of the exit timing is not limited, and the technician can set the exit timing according to the actual use requirement; for example, the determination may be made using outdoor coil temperature, or using image contrast techniques. And the controller acquires the temperature of the outdoor coil and the time length from the end of the first outdoor unit defrosting mode again so as to carry out second defrosting judgment.
Based on the obtaining result in step S103, in step S104, if the outdoor coil temperature obtained again is less than or equal to the preset defrosting coil temperature and the obtained duration from the end of the first outdoor unit defrosting mode is greater than or equal to the preset defrosting interval time, controlling the air conditioning unit to enter the outdoor unit defrosting mode for the second time.
Further, in step S105, after the air conditioning unit exits from the outdoor unit defrosting mode for the second time, that is, under the condition that the number of times of operating the outdoor unit defrosting mode after the air conditioning unit is started up for the second time exceeds two times (that is, a preset number of times), the duration of operating the outdoor unit defrosting mode for the second time by the air conditioning unit, that is, the duration of maintaining the outdoor unit defrosting mode during the second time operation, is obtained, so that the preset defrosting interval time and/or the preset defrosting coil temperature are/is selectively corrected according to actual requirements.
Specifically, if the time length for the air conditioning unit to operate the outdoor unit defrosting mode for the second time is shorter than the first preset time length or longer than the second preset time length, the preset defrosting interval time and/or the preset defrosting coil temperature used in the second defrosting judgment are/is corrected; and if the time length of the air conditioning unit for operating the outdoor unit defrosting mode for the second time is longer than or equal to the first preset time length and shorter than or equal to the second preset time length, the preset defrosting interval time and the preset defrosting coil temperature used in the second defrosting judgment are not corrected.
Further, if the time length for the air conditioning unit to operate the outdoor unit defrosting mode for the second time is shorter than the first preset time length, the preset defrosting interval time used in the last defrosting judgment is increased, and/or the preset defrosting coil temperature used in the last defrosting judgment is reduced.
As a preferred embodiment, if the time period for the air conditioning unit to operate the outdoor unit defrosting mode for the second time is shorter than the third preset time period, it indicates that the defrosting time is too short, and the air conditioning unit may have a false defrosting phenomenon; in this case, both the preset defrosting interval time and the preset defrosting coil temperature are corrected, specifically, the preset defrosting interval time used in the last defrosting judgment is increased, and the preset defrosting coil temperature used in the last defrosting judgment is reduced. It should be noted that, the specific value of the third preset duration is not limited, and a technician can set the third preset duration according to actual use requirements; preferably, the third preset time period is 2 minutes.
As a preferable modification of the preset defrosting interval, the modified preset defrosting interval is equal to the sum of the preset defrosting interval (i.e., the preset defrosting interval used in the second defrosting judgment) and a first modification time length FixTime1, the first modification time length FixTime1 is set to be between 10 minutes and 30 minutes, and the shorter the time length of the outdoor unit defrosting mode of the air conditioning unit in the second operation, the larger the first modification time length FixTime1 is. Further preferably, when the time period for the air conditioning unit to operate the outdoor unit defrosting mode for the second time is the third preset time period, the first correction time period FixTime1 is set to 10 minutes; when the time length of the air conditioning unit for operating the outdoor unit defrosting mode for the second time is zero, a first correction time length FixTime1 is set to be 30 minutes; the first corrected time length FixTime1 corresponding to the other time lengths is calculated by a functional relation determined by the two points.
As a preferred modification mode of the preset defrosting coil temperature, the modified preset defrosting coil temperature is equal to the sum of the preset defrosting coil temperature (i.e. the preset defrosting coil temperature used in the second defrosting judgment) and the first modified temperature FixTe1, the first modified temperature FixTe1 is set between-10 ℃ and 0 ℃, and the shorter the time length of the air conditioning unit in the outdoor unit defrosting mode in the second operation, the smaller the first modified temperature FixTe1 is. Meanwhile, it is further preferable that when the time period during which the outdoor unit defrosting mode of the air conditioning unit is operated for the second time is the third preset time period, the first correction temperature FixTe1 is set to 0 ℃; when the time length of the air conditioning unit in the defrosting mode of the outdoor unit in the second operation is zero, the first correction temperature FixTe1 is set to be-10 ℃; the first corrected temperature FixTe1 corresponding to other time lengths is calculated by a functional relation determined by the two points.
As a preferred embodiment, if the time period for the air conditioning unit to operate the outdoor unit defrosting mode for the second time is shorter than the first preset time period and is greater than or equal to a third preset time period, it indicates that the defrosting time is short, the outdoor unit enters the defrosting mode when the frosting phenomenon is not serious, and the phenomenon of frequently entering the defrosting mode exists; in this case, only the preset defrosting interval time is corrected, specifically, the preset defrosting interval time used in the last defrosting judgment is increased. It should be noted that, the specific value of the first preset duration is not limited, and a technician can set the value according to actual use requirements; preferably, the first preset time period is 4 minutes.
As a preferred modification of the preset defrosting interval, the modified preset defrosting interval is equal to the sum of the preset defrosting interval (i.e. the preset defrosting interval used in the second defrosting judgment) and a second modification time length FixTime2, the second modification time length FixTime2 is smaller than the first modification time length FixTime1, the second modification time length FixTime2 is set between 0 minute and 10 minutes, and the shorter the time length of the outdoor unit defrosting mode of the air conditioning unit in the second operation, the larger the second modification time length FixTime2 is. Further preferably, when the time period for the air conditioning unit to operate the outdoor unit defrosting mode for the second time is the third preset time period, the second correction time period FixTime2 is set to 10 minutes; when the time length of the air conditioning unit for operating the outdoor unit defrosting mode for the second time is the first preset time length, setting a second correction time length FixTime2 to be 0 minute; the second corrected time length FixTime2 corresponding to the other time lengths is calculated by the functional relation determined by the two points.
Further, if the time length for the air conditioning unit to operate the outdoor unit defrosting mode for the second time is greater than or equal to the first preset time length and less than or equal to the second preset time length, it is indicated that the operation time length of the defrosting mode is in a proper time range; in this case, the preset defrosting interval time and the preset defrosting coil temperature used in the second defrosting judgment are not corrected, that is, the preset defrosting interval time and the preset defrosting coil temperature used in the second defrosting judgment are directly used to participate in the defrosting judgment process. It should be noted that, the specific value of the second preset duration is not limited, and a technician can set the second preset duration according to actual use requirements; preferably, the second preset time period is 6 minutes.
Further, if the time length for the air conditioning unit to operate the outdoor unit defrosting mode for the second time is longer than the second preset time length, the preset defrosting interval time used in the last defrosting judgment is reduced, and/or the preset defrosting coil temperature used in the last defrosting judgment is increased.
As a preferred embodiment, if the time period for the air conditioning unit to operate the outdoor unit defrosting mode for the second time is longer than the second preset time period and is less than or equal to the fourth preset time period, it indicates that the defrosting time is longer, the outdoor unit defrosting mode is started to operate only when the outdoor unit has frosted more, and the influence on indoor heat exchange is serious during defrosting; in this case, only the preset defrosting interval time is corrected, specifically, the preset defrosting interval time used in the last defrosting judgment is reduced. It should be noted that, the specific value of the fourth preset duration is not limited, and a technician can set the value according to actual use requirements; preferably, the fourth preset time period is 8 minutes.
As a preferred modification of the preset defrosting interval, the modified preset defrosting interval is equal to the sum of the preset defrosting interval (that is, the preset defrosting interval used in the second defrosting judgment) and a third modification time length FixTime3, the third modification time length FixTime3 is less than the second modification time length FixTime2, the third modification time length FixTime3 is set between-5 minutes and 0 minutes, and the shorter the time length of the outdoor unit defrosting mode of the air conditioning unit operated for the second time, the larger the third modification time length FixTime3 is. Further preferably, when the time period for the air conditioning unit to operate the outdoor unit defrosting mode for the second time is the second preset time period, the third correction time period FixTime3 is set to 0 minute; when the time length of the air conditioning unit for operating the outdoor unit defrosting mode for the second time is the fourth preset time length, the third correction time length FixTime3 is set to be-5 minutes; the third corrected time length FixTime3 corresponding to the other time lengths is calculated by the functional relation determined by the two points.
As a preferred embodiment, if the time period for the air conditioning unit to operate the outdoor unit defrosting mode for the second time is longer than the fourth preset time period and is less than or equal to the fifth preset time period, it indicates that the defrosting time is very long, the outdoor unit starts to operate the outdoor unit defrosting mode when the outdoor unit has frosted seriously, and not only is the influence on indoor heat exchange serious during defrosting, but also the phenomenon of incomplete defrosting may occur; in this case, both the preset defrosting interval time and the preset defrosting coil temperature are corrected, specifically, the preset defrosting interval time used in the last defrosting judgment is reduced, and the preset defrosting coil temperature used in the last defrosting judgment is increased. It should be noted that, the specific value of the fifth preset duration is not limited, and a technician can set the value according to actual use requirements; preferably, the fifth preset time period is 10 minutes.
As a preferred modification of the preset defrosting interval, the modified preset defrosting interval is equal to the sum of the preset defrosting interval (that is, the preset defrosting interval used in the second defrosting judgment) and a fourth modification time length FixTime4, the fourth modification time length FixTime4 is set between-15 minutes and-5 minutes, the fourth modification time length FixTime4 is smaller than the third modification time length FixTime3, and the shorter the time length of the outdoor unit defrosting mode of the air conditioning unit operated for the second time, the larger the fourth modification time length FixTime4 is. Further preferably, when the time period for the air conditioning unit to operate the outdoor unit defrosting mode for the second time is the fourth preset time period, the fourth correction time period FixTime4 is set to-5 minutes; when the time length for the air conditioning unit to operate the outdoor unit defrosting mode for the second time is the fifth preset time length, the fourth correction time length FixTime4 is set to be-15 minutes; the fourth corrected time length FixTime4 corresponding to the other time lengths is calculated by the functional relation determined by the two points.
As a preferable modification manner of the preset defrosting coil temperature, the modified preset defrosting coil temperature is equal to the sum of the preset defrosting coil temperature (i.e., the preset defrosting coil temperature used in the second defrosting judgment) and a second modification temperature FixTe2, the second modification temperature FixTe2 is set to be between 0 ℃ and 5 ℃, the second modification temperature FixTe2 is greater than the first modification temperature FixTe1, and the shorter the duration of the outdoor unit defrosting mode of the air conditioning unit in the second operation, the smaller the second modification temperature FixTe2 is. Further preferably, when the time period for the air conditioning unit to operate the outdoor unit defrosting mode for the second time is the fourth preset time period, the second correction temperature FixTe2 is set to 0 ℃; when the defrosting mode time of the outdoor unit of the air conditioning unit in the second operation is the fifth preset time, setting the second correction temperature FixTe2 to be 5 ℃; the second corrected temperature FixTe2 corresponding to other time lengths is calculated by a functional relation determined by the two points.
In addition, it should be noted that, as a preferred setting mode, the correction range of the preset defrosting coil temperature is from-25 ℃ to-1 ℃, the correction range of the preset defrosting interval time is from 30 minutes to 240 minutes, and when the corrected preset defrosting coil temperature or the preset defrosting interval time exceeds the setting range, an endpoint value is directly taken, so as to effectively ensure the reliability of data. In addition, although the preferred embodiment has been described by taking the parameter correction process in the third defrosting judgment as an example, it is obvious that the defrosting control method of the present invention can also be used in the fourth defrosting judgment or the subsequent defrosting judgment as long as the parameters involved therein are changed accordingly.
Further, in step S111, the controller can obtain the temperature of the outdoor coil of the air conditioning unit and the time length from the end of the second outdoor unit defrosting mode again, so as to perform a third defrosting judgment. Next, in step S112, the controller can determine the time when the air conditioning unit enters the outdoor unit defrosting mode this time according to the preset defrosting coil temperature and the preset defrosting interval time determined in the above embodiment. Specifically, under the condition that only the preset defrosting coil temperature is corrected, if the acquired outdoor coil temperature is less than or equal to the corrected preset defrosting coil temperature and the acquired duration is greater than or equal to the preset defrosting interval time, controlling the air conditioning unit to enter an outdoor unit defrosting mode; under the condition that only the preset defrosting interval time is corrected, if the acquired outdoor coil temperature is less than or equal to the preset defrosting coil temperature and the acquired duration is greater than or equal to the corrected preset defrosting interval time, controlling the air conditioning unit to enter an outdoor unit defrosting mode; and under the condition that the preset defrosting coil temperature and the preset defrosting interval time are both corrected, if the acquired outdoor coil temperature is less than or equal to the corrected preset defrosting coil temperature and the acquired duration is greater than or equal to the corrected preset defrosting interval time, controlling the air conditioning unit to enter an outdoor unit defrosting mode.
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 apparent that the scope of the present invention is not limited to these specific embodiments, as will be readily understood by those skilled in the art. 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 defrosting control method for an air conditioning unit is characterized by comprising the following steps:
acquiring the time length of the last outdoor unit defrosting mode operation of the air conditioning unit under the condition that the times of the outdoor unit defrosting mode operation of the air conditioning unit after the air conditioning unit is started at this time exceed the preset times;
if the last time of the air conditioning unit for operating the outdoor unit defrosting mode is shorter than a first preset time or longer than a second preset time, correcting the preset defrosting interval time and/or the preset defrosting coil temperature used in the last defrosting judgment;
judging the time when the air conditioning unit enters the outdoor unit defrosting mode at this time according to the corrected preset defrosting coil temperature and/or the preset defrosting interval time;
the first preset time length is less than the second preset time length.
2. The defrosting control method according to claim 1, wherein the step of correcting the preset defrosting interval time and/or the preset defrosting coil temperature used in the last defrosting judgment if the last time the outdoor unit defrosting mode was operated by the air conditioning unit is shorter than a first preset time or longer than a second preset time comprises:
and if the last time of the air conditioning unit for operating the outdoor unit defrosting mode is shorter than the first preset time, increasing the preset defrosting interval time used in the last defrosting judgment, and/or reducing the temperature of the preset defrosting coil used in the last defrosting judgment.
3. The defrost control method of claim 2, wherein the step of increasing the preset defrost interval time used in the last defrost determination and/or decreasing the preset defrost coil temperature used in the last defrost determination if the last outdoor unit defrost mode operation of the air conditioning unit was less than the first preset time period comprises:
and if the last time of the air conditioning unit for operating the outdoor unit defrosting mode is shorter than the first preset time and longer than or equal to a third preset time, only increasing the preset defrosting interval time used in the last defrosting judgment.
4. The defrost control method of claim 3, wherein the step of increasing the preset defrost interval time used in the last defrost determination and/or decreasing the preset defrost coil temperature used in the last defrost determination if the last outdoor unit defrost mode operation of the air conditioning unit was less than the first preset time period further comprises:
and if the last time of the air conditioning unit for operating the outdoor unit defrosting mode is shorter than the third preset time, increasing the preset defrosting interval time used in the last defrosting judgment, and reducing the temperature of the preset defrosting coil used in the last defrosting judgment.
5. The defrosting control method according to claim 1, wherein the step of correcting the preset defrosting interval time and/or the preset defrosting coil temperature used in the last defrosting judgment if the last time the outdoor unit defrosting mode was operated by the air conditioning unit is shorter than a first preset time or longer than a second preset time further comprises:
and if the time length of the last time of the air conditioning unit for operating the outdoor unit defrosting mode is longer than the second preset time length, reducing the preset defrosting interval time used in the last defrosting judgment, and/or increasing the temperature of the preset defrosting coil used in the last defrosting judgment.
6. The defrost control method of claim 5, wherein the step of reducing the preset defrost interval time used in the previous defrost determination and/or increasing the preset defrost coil temperature used in the previous defrost determination if the last outdoor unit defrost mode operation of the air conditioning unit was longer than the second preset duration comprises:
and if the time length of the last time of the air conditioning unit for operating the outdoor unit defrosting mode is longer than the second preset time length and is shorter than or equal to a fourth preset time length, only reducing the preset defrosting interval time used in the last defrosting judgment.
7. The defrost control method of claim 6, wherein the step of reducing the preset defrost interval time used in the previous defrost determination and/or increasing the preset defrost coil temperature used in the previous defrost determination if the last outdoor unit defrost mode operation of the air conditioning unit was longer than the second preset duration further comprises:
and if the last time of the air conditioning unit for operating the outdoor unit defrosting mode is longer than the fourth preset time and shorter than or equal to the fifth preset time, reducing the preset defrosting interval time used in the last defrosting judgment, and increasing the temperature of the preset defrosting coil used in the last defrosting judgment.
8. The defrosting control method according to any one of claims 1 to 7, wherein the step of determining the timing of the air conditioning unit entering the outdoor unit defrosting mode this time according to the corrected preset defrosting coil temperature and/or the preset defrosting interval time further comprises:
acquiring the temperature of an outdoor coil of the air conditioning unit and the time length from the end of the last outdoor unit defrosting mode;
under the condition that only the preset defrosting coil temperature is corrected, if the acquired outdoor coil temperature is less than or equal to the corrected preset defrosting coil temperature and the acquired duration is greater than or equal to the preset defrosting interval time, controlling the air conditioning unit to enter an outdoor unit defrosting mode;
under the condition that only the preset defrosting interval time is corrected, if the acquired outdoor coil temperature is less than or equal to the preset defrosting coil temperature and the acquired duration is greater than or equal to the corrected preset defrosting interval time, controlling the air conditioning unit to enter an outdoor unit defrosting mode;
and under the condition that the preset defrosting coil temperature and the preset defrosting interval time are both corrected, if the acquired outdoor coil temperature is less than or equal to the corrected preset defrosting coil temperature and the acquired duration is greater than or equal to the corrected preset defrosting interval time, controlling the air conditioning unit to enter an outdoor unit defrosting mode.
9. The defrost control method of any one of claims 1-7, wherein the preset defrost coil temperature is modified in a range of-25 ℃ to-1 ℃; and/or
The preset defrosting interval time is corrected within a range of 30 minutes to 240 minutes.
10. The defrost control method of any one of claims 1-7, wherein the preset number of times is two.
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| WO2023045320A1 (en) * | 2021-09-26 | 2023-03-30 | 青岛海尔中央空调有限公司 | Defrosting control method for air conditioner |
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Application publication date: 20210910 |