CN111397098B - Defrosting control method and device, air conditioner and computer readable storage medium - Google Patents
Defrosting control method and device, air conditioner and computer readable storage medium Download PDFInfo
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- CN111397098B CN111397098B CN202010281355.8A CN202010281355A CN111397098B CN 111397098 B CN111397098 B CN 111397098B CN 202010281355 A CN202010281355 A CN 202010281355A CN 111397098 B CN111397098 B CN 111397098B
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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
- F24F11/64—Electronic processing using pre-stored data
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Abstract
The embodiment of the invention provides a defrosting control method and device, an air conditioner and a computer readable storage medium, and relates to the technical field of defrosting. Wherein, the defrosting control method comprises the following steps: and when the outdoor environment temperature belongs to a preset temperature interval and the absolute difference between the indoor environment temperature and the set temperature does not exceed a preset value, judging whether to start defrosting according to the frequency of a compressor of the air conditioner. And when the outdoor environment temperature does not belong to a preset temperature zone or the absolute difference between the indoor environment temperature and the set temperature exceeds a preset value, judging whether defrosting is started or not according to the change condition of the heating output quantity of the air conditioner. According to the scheme, whether the air conditioner needs defrosting or not is judged flexibly based on the change of the frequency of the compressor or based on the heating output quantity under different running conditions, so that a user can accurately identify the defrosting opportunity while normally using the air conditioner, and the probability of defrosting misjudgment is reduced.
Description
Technical Field
The invention relates to the technical field of defrosting, in particular to a defrosting control method and device, an air conditioner and a computer readable storage medium.
Background
At present, when a heating mode of an air conditioner is used in a low-temperature environment, a frosting phenomenon occurs on a heat exchanger of an outdoor unit along with the increase of heating time. However, when the heating mode of the air conditioner is used in a low-temperature environment, the frosting phenomenon is inevitable, and the problem can be solved only by removing the frosting layer on the heat exchanger. However, frequent defrosting also affects the normal use of the user.
In the related art, whether defrosting is performed is mainly judged through heating time. However, this approach is prone to false positives, resulting in premature or late defrost. The heat exchange effect of the air conditioner cannot be obviously improved, and energy consumption is wasted.
Disclosure of Invention
The invention solves the problem of accurately identifying the defrosting time, and avoids premature or late defrosting while ensuring user experience.
In order to solve the above problems, the embodiments of the present invention adopt the following technical solutions:
in a first aspect, an embodiment of the present invention provides a defrosting control method, which is applied to an air conditioner, and the defrosting control method includes: acquiring outdoor environment temperature, indoor environment temperature and set temperature; when the outdoor environment temperature belongs to a preset temperature interval and the absolute difference between the indoor environment temperature and the set temperature does not exceed a preset value, judging whether defrosting is started or not according to the frequency of a compressor of the air conditioner; and when the outdoor environment temperature does not belong to a preset temperature zone or the absolute difference between the indoor environment temperature and the set temperature exceeds a preset value, judging whether defrosting is started or not according to the change condition of the heating output quantity of the air conditioner.
In some optional embodiments, the air conditioner has a first corresponding relationship among the set temperature, the outdoor environment temperature, the indoor environment temperature and a reference compressor frequency stored therein, and the step of determining whether to initiate defrosting according to the compressor frequency of the air conditioner includes: based on the set temperature, the outdoor environment temperature and the indoor environment temperature, inquiring corresponding target compressor frequency by utilizing the first corresponding relation; and if the frequency of the compressor of the air conditioner is greater than the target frequency of the compressor, starting automatic defrosting.
In some optional embodiments, a second corresponding relationship among the set temperature, the indoor ambient temperature and the reference heating output amount at the critical frost layer coefficient is stored in the air conditioner; the step of judging whether to start defrosting according to the change condition of the heating output of the air conditioner comprises the following steps: acquiring the real-time heating output quantity of the air conditioner; based on the set temperature and the indoor environment temperature, inquiring the corresponding target reference heating output quantity by utilizing the second corresponding relation; comparing the heating output with the target reference heating output to determine whether to initiate defrosting.
In some optional embodiments, the step of comparing the heating output with the target reference heating output to determine whether to initiate defrosting comprises:
according to the heating output quantity and the target reference heating output quantity, a formula is utilized:
a＝|Q1-Q2|/Q1
calculating a corresponding attenuation rate; wherein a represents the decay rate; q1Represents the target reference heating output; q2Representing said heating output;
and when the attenuation rate is not less than the preset attenuation proportion, judging to perform automatic defrosting.
In some optional embodiments, the step of obtaining the real-time heating output of the air conditioner comprises: acquiring the heat exchange coefficient, the effective heat exchange area, the temperature of inlet air, the temperature of outlet air and the condensation temperature of the air conditioner; and calculating the heating output quantity according to the heat exchange coefficient, the effective heat exchange area, the temperature of the inlet air, the temperature of the outlet air and the condensation temperature.
In a second aspect, an embodiment of the present invention provides a defrosting control device applied to an air conditioner, where the defrosting control device includes:
the acquisition module is used for acquiring the outdoor environment temperature, the indoor environment temperature and the set temperature;
the judging module is used for judging whether defrosting is started or not according to the frequency of a compressor of the air conditioner when the outdoor environment temperature belongs to a preset temperature interval and the absolute difference between the indoor environment temperature and the set temperature does not exceed a preset value;
the judging module is further used for judging whether defrosting is started or not according to the change condition of the heating output of the air conditioner when the outdoor environment temperature does not belong to a preset temperature zone or the absolute difference between the indoor environment temperature and the set temperature exceeds a preset value.
In some optional embodiments, the air conditioner has a first corresponding relationship among the set temperature, the outdoor ambient temperature, the indoor ambient temperature and a reference compressor frequency at a critical frost layer coefficient stored therein, and the determining module includes: the first query submodule is used for querying the corresponding target compressor frequency by utilizing the first corresponding relation based on the set temperature, the outdoor environment temperature and the indoor environment temperature; and the judgment submodule is used for starting automatic defrosting if the frequency of the compressor of the air conditioner is greater than the target frequency of the compressor.
In some optional embodiments, a second corresponding relationship among the set temperature, the indoor ambient temperature and the reference heating output amount at the critical frost layer coefficient is stored in the air conditioner; the judging module comprises: the obtaining submodule is used for obtaining the real-time heating output of the air conditioner; a second query submodule, configured to query the corresponding target reference heating output amount by using the second correspondence relationship based on the set temperature and the indoor environment temperature; a comparison submodule for comparing the heating output with the target reference heating output to determine whether to initiate defrosting.
In a third aspect, embodiments of the present invention provide an air conditioner, including a processor and a memory, where the memory stores machine-executable instructions executable by the processor, and the processor may execute the machine-executable instructions to implement the method provided in the first aspect.
In a fourth aspect, an embodiment of the present invention provides a computer-readable storage medium, on which a computer program is stored, and the computer program, when executed by a processor, implements the method provided in the first aspect.
Compared with the prior art, the defrosting control method provided by the embodiment of the invention aims to flexibly select whether the current state of the air conditioner needs defrosting or not based on the change of the frequency of the compressor or the heating output quantity according to different running conditions. Through the cooperation of the two judgment modes, the defrosting opportunity is accurately identified while the normal use of the air conditioner by a user is guaranteed, and the probability of defrosting misjudgment is reduced. Optionally, the defrosting control method includes acquiring an outdoor environment temperature, an indoor environment temperature and a set temperature, and determining whether to start defrosting according to a frequency of a compressor of the air conditioner when the outdoor environment temperature belongs to a preset temperature interval and an absolute difference between the indoor environment temperature and the set temperature does not exceed a preset value. And when the outdoor environment temperature does not belong to a preset temperature interval or the absolute difference between the indoor environment temperature and the set temperature exceeds a preset value, judging whether defrosting is started or not according to the change condition of the heating output quantity of the air conditioner. Therefore, the accuracy of defrosting judgment is improved, unnecessary defrosting is reduced on the premise of ensuring the heat exchange efficiency of the air conditioner, and the energy efficiency ratio of the air conditioner is improved.
Drawings
Fig. 1 is a schematic view of an air conditioner according to an embodiment of the present invention;
FIG. 2 is a flow chart of the steps of a defrost control method provided in an embodiment of the present invention;
FIG. 3 is a flowchart illustrating sub-steps of step S102 in FIG. 2;
fig. 4 is an exemplary diagram of a first corresponding relationship provided in the embodiment of the present invention;
FIG. 5 is a flowchart illustrating sub-steps of step S103 in FIG. 2;
fig. 6 is an exemplary diagram of a second corresponding relationship provided in the embodiment of the present invention;
fig. 7 is a schematic diagram of a defrosting control device according to an embodiment of the present invention.
Description of reference numerals:
1-an air conditioner; 2-a memory; 3-a processor; 4-a collection unit; 5-a defrost control device; 6-an acquisition module; 7-judging module.
Detailed Description
At present, when a heating mode of an air conditioner is used in a low-temperature environment, the frosting phenomenon can occur on the outer side of a heat exchanger of an outdoor unit along with the increase of heating time. The occurrence of the frosting phenomenon will affect the heat exchange effect of the air conditioner 1.
Therefore, the occurrence of the frosting phenomenon is related to the heating time on one hand, and can be directly reflected on the heat exchange performance of the heat exchanger on the other hand. Based on the above characteristics, there are two main defrosting timing decision strategies in the related art: one method is to judge through the heating time, namely the heating time exceeds the specified time, and then defrost is started. And the other method is used for judging whether the air conditioner needs defrosting or not based on the combination of the temperature of the inner disc of the inner machine, the running time of the air conditioner and the ambient temperature of the outer machine side.
In the first strategy, the strategy is judged to be relatively rigid without considering the actual running state of the air conditioner. The second strategy described above does not take into account the substantial effect of the degree of frosting on the indoor temperature. Thus, both are prone to premature or late defrost problems. In addition, the second strategy is also susceptible to non-frosting problems, resulting in false triggering of defrosting.
In order to improve the above problem, embodiments of the present invention provide a defrosting control method and apparatus, an air conditioner 1, and a computer-readable storage medium.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
In some embodiments, please refer to fig. 1, which is a block diagram of an air conditioner 1. The air conditioner 1 includes a memory 2, a processor 3, and a collection unit 4. The memory 2, the processor 3 and the acquisition unit 4 are electrically connected to each other directly or indirectly to realize data transmission or interaction. For example, the components may be electrically connected to each other via one or more communication buses or signal lines.
The memory 2 is used for storing programs or data. The Memory 2 may be, but is not limited to, a Random Access Memory (RAM), a Read Only Memory (ROM), a Programmable Read-Only Memory (PROM), an Erasable Read-Only Memory (EPROM), an electrically Erasable Read-Only Memory (EEPROM), and the like.
The processor 3 is used to read/write data or programs stored in the memory 2 and perform corresponding functions.
The collecting unit 4 can be used for collecting outdoor environment temperature, indoor environment temperature, air inlet air temperature, air outlet air temperature and condensation temperature. In other words, the acquisition unit 4 may include a plurality of temperature sensors. The temperature sensors can be respectively arranged on the outer side of the outdoor unit, the outer side of the indoor unit, the air inlet, the air outlet and the heat exchanger of the air conditioner 1, so that the required outdoor environment temperature, indoor environment temperature, air inlet air temperature, air outlet air temperature and condensation temperature can be acquired.
It should be understood that the configuration shown in fig. 1 is merely a schematic configuration of the air conditioner 1, and that the air conditioner 1 may include more or less components than those shown in fig. 1, or have a different configuration than that shown in fig. 1. The components shown in fig. 1 may be implemented in hardware, software, or a combination thereof.
Referring to fig. 2, fig. 2 shows a defrosting control method according to an embodiment of the present invention. The above-described defrosting control method is applied to the air conditioner 1. As shown in fig. 2, the defrosting control method may include the steps of:
step S101, obtaining outdoor environment temperature, indoor environment temperature and set temperature.
The outdoor ambient temperature may be a real-time temperature of an environment in which an outdoor unit of the air conditioner 1 is located. The indoor ambient temperature may be a real-time temperature of an environment in which the indoor unit of the air conditioner 1 is located.
In some embodiments, the outdoor ambient temperature and the indoor ambient temperature may be collected by the collecting unit 4. As an embodiment, the collecting unit 4 of the air conditioner 1 may periodically collect the outdoor ambient temperature and the indoor ambient temperature.
The set temperature may be an indoor temperature expected by a user. It is understood that the set temperature may be obtained from a temperature setting instruction issued by the user to the air conditioner 1. The air conditioner 1 can control the indoor ambient temperature to be maintained at a temperature close to the set temperature by adjusting the compressor frequency, the opening degree of the expansion valve, and the like. For example, if the user sets the heating temperature of the air conditioner to 30 ℃ by using a remote controller, the set temperature can be 30 ℃.
Step S102, when the outdoor environment temperature belongs to the preset temperature interval and the absolute difference between the indoor environment temperature and the set temperature does not exceed the preset value, whether defrosting is started or not is judged according to the frequency of the compressor of the air conditioner 1.
The preset temperature interval can be a temperature interval which is determined through testing and is easy to frost, and the corresponding temperature value is not too low. That is, in this temperature environment, frost formation is likely to occur and the compressor is not required to be operated at a high frequency for heating. For example, the predetermined temperature interval may be a temperature interval between-5 ℃ and 8 ℃.
The preset value may be a small value for measuring whether the indoor ambient temperature is close to the set temperature. Of course, in some embodiments, the value of the preset value may be set according to the acceptance degree of the user for the temperature difference. For example, if the temperature difference of 0.5 ℃ is not different from the user's perception, the preset value may be determined to be 0.5 ℃.
In addition, in some embodiments, the preset value may also be determined by:
in the first mode, a tester analyzes data fed back by a large number of customer groups, determines a preset value, and configures the preset value in the air conditioner 1.
In the second mode, a target temperature value which enables a user to determine that the temperature difference is difficult to perceive is tested for each optional set temperature, and the temperature difference between the set temperature and the target temperature value is used as a preset temperature. In other words, the preset value set in the air conditioner 1 may have a plurality of preset values, and the preset values corresponding to different set temperatures may be different. Compared with the first mode, the mode is more flexible, each set temperature has a proper preset value, and therefore the control process can be more accurate.
And in the third mode, recording the first physiological parameter of the user when the indoor environment temperature is equal to the set temperature and recording the second physiological parameter of the user when the indoor environment temperature is equal to a plurality of temperature points close to the set temperature respectively. And selecting a target physiological parameter from the second physiological parameters through comparison, and taking the absolute difference between the corresponding temperature point and the set temperature as a preset value. The physiological parameters can be body surface thermal infrared information, skin electric information and the like. The target physiological parameter is a physiological parameter with the largest difference value between the corresponding temperature point in the second physiological parameter and the set temperature, wherein the difference between the target physiological parameter and the first physiological parameter meets the preset requirement.
For example, the temperature is set to 30 ℃, the thermal infrared information of indoor personnel at the indoor environment temperature of 30 ℃, the thermal infrared information of indoor personnel at 30.1 ℃, the thermal infrared information of indoor personnel at 30.2 ℃, the thermal infrared information of indoor personnel at 30.3 ℃, the thermal infrared information of indoor personnel at 30.4 ℃, the thermal infrared information of indoor personnel at 30.5 ℃ and the thermal infrared information of indoor personnel at 30.6 ℃ are respectively recorded, if the difference between the thermal infrared information corresponding to 30.1-30.4 ℃ and the thermal infrared information of indoor personnel at 30 ℃ meets the preset requirement, the thermal infrared information corresponding to 30.4 ℃ is used as the target physiological parameter, and 0.4 ℃ is used as the preset value corresponding to the set temperature of 30 ℃.
It can be understood that when the outdoor ambient temperature belongs to the preset temperature range and the absolute difference between the indoor ambient temperature and the set temperature does not exceed the preset value, the indoor ambient temperature is not required to be greatly increased, and only the indoor ambient temperature is required to be maintained in the current state, so that the air conditioner 1 is not required to provide excessive heating output. Normally, the compressor frequency at this time is not only not increased continuously but also gradually decreased, thereby ensuring energy saving performance of the air conditioner 1. In other words, the frequency requirement of the compressor for normal operation of the air conditioner 1 is not high, i.e., the compressor frequency does not fluctuate excessively.
Based on the operation characteristics of the air conditioner 1 when the outdoor environment temperature belongs to the preset temperature interval and the absolute difference between the indoor environment temperature and the set temperature does not exceed the preset value, in the embodiment of the invention, whether defrosting is started or not can be judged by monitoring the frequency of the compressor. It can be understood that, in the above-mentioned operation state, the irregular fluctuation of the compressor frequency caused by the normal operation requirement of the air conditioner can be eliminated. In addition, the frosting phenomenon may cause the air conditioner 1 to have a poor heat exchange effect, and further cause the air conditioner 1 to be unable to maintain the indoor ambient temperature near the set temperature under the same compressor frequency, so the air conditioner 1 may abnormally increase the compressor frequency. Meanwhile, the degree of frosting can be reflected by the increase degree of the frequency of the compressor. Therefore, under the operating condition that the outdoor environment temperature belongs to the preset temperature interval and the absolute difference between the indoor environment temperature and the set temperature does not exceed the preset value, whether defrosting is needed or not can be accurately judged by detecting the frequency of the compressor, and the occurrence of misjudgment is avoided.
In some embodiments, as shown in fig. 3, the above-mentioned determining whether to initiate defrosting according to the compressor frequency of the air conditioner 1 may include:
and a substep S102-1 of inquiring a corresponding target compressor frequency using the first correspondence based on the set temperature, the outdoor ambient temperature, and the indoor ambient temperature.
The first correspondence relationship is data representing the relationship between the set temperature, the outdoor ambient temperature, the indoor ambient temperature, and the reference compressor frequency, which are stored in advance in the air conditioner 1. The first correspondence may be obtained through testing. In addition, the frost layer coefficient corresponding to the air conditioner 1 in the test process is the critical frost layer coefficient.
The frost layer coefficient is used for representing the severity of frost formation, and can be determined according to the attenuation of the air quantity of the external fan penetrating through the heat exchanger. For example, when the attenuation of the air volume is 100% (i.e., the air volume attenuation is 0), the corresponding frost layer coefficient is 1; the attenuation of the air volume was 60%, and the corresponding frost layer coefficient was 0.6.
The above critical frost layer coefficient characterizes the maximum thickness of frost allowed during operation of the air conditioner. It will be appreciated that defrosting is required during operation when the frost factor of the air conditioner 1 exceeds the critical frost factor.
In some embodiments, the manner of obtaining the first corresponding relationship may be: first, the air conditioner 1 is placed under a condition where the frost layer coefficient is the critical frost layer coefficient by simulation. Next, when the air conditioner 1 controls the indoor ambient temperature to meet the requirement of approaching the set temperature under different outdoor ambient temperatures, the corresponding compressor frequency is tested to serve as the corresponding reference compressor frequency. It can be understood that the above-mentioned manner can be utilized to test the corresponding compressor frequency when the indoor ambient temperature of the air conditioner 1 meets the requirement of approaching the set temperature under different set temperatures, thereby establishing a perfect first corresponding relationship. Taking the first corresponding relation represented by the table shown in fig. 4 as an example, when the critical frost layer coefficient is 0.6, the working condition satisfies that the outdoor environment temperature To is more than or equal To-5 and less than or equal To 8, and the indoor environment temperature T approaches the set temperature Ts, the frequency required by the compressor To maintain the room at the moment is taken as the reference compressor frequency Fs.
Thus, when the actual set temperature, the outdoor ambient temperature, and the indoor ambient temperature of the air conditioner 1 are obtained, the corresponding target compressor frequency can be found through the first corresponding relationship. And if the corresponding target compressor frequency is not searched based on the set temperature, the outdoor environment temperature and the indoor environment temperature, searching the corresponding target compressor frequency according to the set temperature and the outdoor environment temperature. For example, if the set temperature is 30 ℃, the outdoor ambient temperature is 1 ℃ and the indoor ambient temperature is 29.3 ℃, the target compressor frequency that is completely matched cannot be found according to the first corresponding relationship presented in fig. 4, and therefore, the target compressor frequency is found to be 75Hz according to the first corresponding relationship presented in fig. 4 by using the set temperature of 30 ℃ and the outdoor ambient temperature of 1 ℃. If the set temperature is 30 deg.c, the outdoor ambient temperature is 2 deg.c, and the indoor ambient temperature is 29.3 deg.c, the target compressor frequency is found to be 72Hz according to the above table.
In the substep S102-2, if the compressor frequency of the air conditioner 1 is greater than the target compressor frequency, the automatic defrosting is started.
It will be appreciated that due to the increased thickness of the frost layer, the air conditioner 1 needs to constantly raise the compressor in an effort to maintain the indoor ambient temperature close to the set temperature. When the compressor frequency of the air conditioner 1 is greater than the target compressor frequency, it indicates that the frosting degree of the air conditioner 1 has reached the defrosting requirement, otherwise, the condition of increasing more energy consumption and influencing the indoor environment temperature is caused.
In addition, as shown in fig. 4, the first corresponding relationship may also present a corresponding relationship between the set temperature, the outdoor ambient temperature, the indoor ambient temperature, and the reference heating output amount. As such, in other embodiments, when the compressor frequency of the air conditioner 1 is greater than the target compressor frequency, the current heating output of the air conditioner 1 is obtained and compared with the corresponding reference heating output. If the current heating output is less than the corresponding reference heating output, it is determined that automatic defrost is initiated.
Step S103, when the outdoor ambient temperature does not belong to the preset temperature interval or the absolute difference between the indoor ambient temperature and the set temperature exceeds the preset value, determining whether to start defrosting according to the change of the heating output of the air conditioner 1.
It can be understood that when the outdoor ambient temperature is higher than the temperature value corresponding to the preset temperature interval, the possibility of frosting is very low, and therefore, the compressor is allowed to increase the frequency of the compressor before the comfort level of the air conditioner 1 is ensured. When the outdoor environment temperature is lower than the temperature value corresponding to the preset temperature interval, the indoor environment temperature can be quickly increased only by the aid of higher compressor frequency due to too low temperature. When the absolute difference between the indoor ambient temperature and the set temperature exceeds the preset value, the compressor of the air conditioner 1 is also required to work at a higher frequency, so that the indoor ambient temperature is rapidly increased, and the comfort of the user in using the air conditioner 1 is guaranteed. It can be seen that the frequency of the compressor varies irregularly under the above working conditions. Therefore, in order to avoid misjudgment of defrosting, whether to start defrosting can be judged by using the change of heating output.
In some embodiments, as shown in fig. 5, the determining whether to initiate defrosting according to the variation of the heating output of the air conditioner 1 may include:
and a substep S103-1 of obtaining the real-time heating output of the air conditioner 1.
The heating output is the amount of heat output by the air conditioner 1 to the indoor environment.
In some embodiments, the heating output may be calculated according to the heat exchange coefficient, the effective heat exchange area, the air inlet temperature, the air outlet temperature, and the condensation temperature of the air conditioner 1, which are obtained. As an embodiment, first, based on the inlet air temperature, the outlet air temperature, and the condensation temperature, the following formula is used:
and calculating the logarithmic average heat exchange temperature difference of the heat exchanger. Wherein, Δ tmRepresents the logarithmic mean heat exchange temperature difference of the heat exchanger, t1Is represented byWind air temperature, t2Representing the outlet air temperature, teRepresenting the condensation temperature.
Due to Δ tmAnd teIn a linear relationship, therefore, in some possible embodiments, according to teIs measured to obtain Δ tm。
Secondly, according to the logarithmic mean heat exchange temperature difference, the heat exchange coefficient and the effective heat exchange area of the heat exchanger, the formula is utilized:
Q＝KA·Δtm，
and calculating heating output. Wherein Q represents the calculated heating output. K represents the heat transfer coefficient, which is understood to be a constant value. A represents the effective heat exchange area, and understandably, the effective heat exchange area is the inherent property of the air conditioner 1 and can be obtained by inquiring the parameters of the heat exchanger of the air conditioner 1.
In some embodiments, heating output may also be obtained by an enthalpy difference table test. Therefore, KA is a constant value and can be converted from the heating output obtained by the enthalpy difference table test.
And a substep S103-2 of inquiring a corresponding target reference heating output amount using the second correspondence relationship based on the set temperature and the indoor ambient temperature.
The second correspondence relationship is data representing the relationship between the set temperature, the indoor ambient temperature, and the reference heating output amount, which is stored in advance in the air conditioner 1. The second correspondence may be obtained through testing. Similarly, the frost layer coefficient corresponding to the air conditioner 1 in the test process is the critical frost layer coefficient.
In some embodiments, the manner of obtaining the second corresponding relationship may be: first, the air conditioner 1 is placed under a condition where the frost layer coefficient is the critical frost layer coefficient by simulation. Next, the air conditioner 1 is configured to be at a set temperature, and the heating output of the air conditioner 1 when the air conditioner 1 is operated at different indoor ambient temperatures is respectively tested to be used as a reference heating output corresponding to the set temperature and the indoor ambient temperature. It is understood that the correspondence between the indoor ambient temperature and the reference heating output amount of the air conditioner 1 at different set temperatures can be tested in the above manner, so as to establish a perfect second correspondence. For example, the established second corresponding relationship may be presented as a table shown in fig. 6.
And a substep S103-3 of comparing the heating output with the target reference heating output to determine whether to initiate defrosting.
In some embodiments, an equation may be first utilized according to the heating output and the target reference heating output:
a＝|Q1-Q2|/Q1；
the corresponding decay rate is calculated. Wherein a represents the decay rate; q1Represents the target reference heating output; q2Representing said heating output.
And secondly, when the attenuation rate is not less than the preset attenuation proportion, judging to perform automatic defrosting. For example, if the calculated attenuation rate is not less than 40%, automatic defrosting is triggered.
Note that, if it is determined in the above-described step S102 and step S103 that defrosting is not necessary, the flow returns to step S101 after the interval of a predetermined time period.
In order to perform the corresponding steps in the above embodiments and various possible manners, an implementation manner of the defrosting control method is given below. Further, referring to fig. 7, fig. 7 is a functional block diagram of a defrosting control device 5 according to an embodiment of the present invention. It should be noted that the basic principle and the technical effects of the defrosting control device 5 provided in the present embodiment are the same as those of the above embodiments, and for the sake of brief description, no part of the present embodiment is mentioned, and reference may be made to the corresponding contents in the above embodiments. The defrosting control means 5 includes: an acquisition module 6 and a judgment module 7.
And the acquisition module 6 is used for acquiring the outdoor environment temperature, the indoor environment temperature and the set temperature.
In some embodiments, the above step S101 may be performed by the obtaining module 6.
And the judging module 7 is used for judging whether defrosting is started or not according to the frequency of the compressor of the air conditioner 1 when the outdoor environment temperature belongs to a preset temperature interval and the absolute difference between the indoor environment temperature and the set temperature does not exceed a preset value.
In some embodiments, the step S102 may be performed by the determining module 7.
The judging module 7 is further configured to judge whether to start defrosting according to a change condition of the heating output of the air conditioner 1 when the outdoor environment temperature does not belong to a preset temperature zone or an absolute difference between the indoor environment temperature and the set temperature exceeds a preset value.
In some embodiments, the step S103 may be performed by the determining module 7.
Optionally, the air conditioner 1 stores therein a first corresponding relationship among the set temperature, the outdoor ambient temperature, the indoor ambient temperature and a reference compressor frequency under a critical frost layer coefficient, and the determining module 7 includes:
and the first query submodule is used for querying the corresponding target compressor frequency by utilizing the first corresponding relation based on the set temperature, the outdoor environment temperature and the indoor environment temperature.
In some embodiments, the above sub-step S102-1 may be performed by a first query sub-module.
And the judgment submodule is used for starting automatic defrosting if the frequency of the compressor of the air conditioner 1 is greater than the target frequency of the compressor.
In some embodiments, the above sub-step S102-2 may be performed by a decision sub-module.
Optionally, a second corresponding relationship between the set temperature, the indoor environment temperature and the reference heating output is stored in the air conditioner 1; the judging module 7 includes:
and the obtaining submodule is used for obtaining the real-time heating output of the air conditioner 1.
In some embodiments, the above sub-step S103-1 may be performed by an acquisition sub-module.
And the second query submodule is used for querying the corresponding target reference heating output quantity by utilizing the second corresponding relation based on the set temperature and the indoor environment temperature.
In some embodiments, the above sub-step S103-2 may be performed by a second query sub-module.
A comparison submodule for comparing the heating output with the target reference heating output to determine whether to initiate defrosting.
In some embodiments, the above sub-step S103-3 may be performed by a comparison sub-module.
Alternatively, the above modules may be stored in the form of software or Firmware (Firmware) in the memory 2 of the air conditioner 1 shown in fig. 1 or be fixed in an Operating System (OS) of the air conditioner 1, and may be executed by the processor 3 of the air conditioner 1 shown in fig. 1. Meanwhile, data, codes of programs, and the like required to execute the above modules may be stored in the memory 2.
In summary, embodiments of the present invention provide a defrosting control method and apparatus, an air conditioner, and a computer-readable storage medium. Wherein, the defrosting control method comprises the following steps: and when the outdoor environment temperature belongs to a preset temperature interval and the absolute difference between the indoor environment temperature and the set temperature does not exceed a preset value, judging whether to start defrosting according to the frequency of a compressor of the air conditioner. And when the outdoor environment temperature does not belong to a preset temperature zone or the absolute difference between the indoor environment temperature and the set temperature exceeds a preset value, judging whether defrosting is started or not according to the change condition of the heating output quantity of the air conditioner. Under different operating conditions, the air conditioner is flexibly judged whether defrosting is needed or not based on the change of the frequency of the compressor or the heating output quantity, so that the defrosting opportunity is accurately identified while the user normally uses the air conditioner, and the probability of misjudgment of defrosting is reduced.
Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be made by one skilled in the art without departing from the spirit and scope of the invention.
Claims (8)
1. A defrost control method, characterized by being applied to an air conditioner (1), the defrost control method comprising:
acquiring outdoor environment temperature, indoor environment temperature and set temperature;
when the outdoor environment temperature belongs to a preset temperature interval and the absolute difference between the indoor environment temperature and the set temperature does not exceed a preset value, judging whether defrosting is started or not according to the frequency of a compressor of the air conditioner (1);
the air conditioner (1) stores a first corresponding relation among the set temperature, the outdoor environment temperature, the indoor environment temperature and a reference compressor frequency under a critical frost layer coefficient, and the step of judging whether to start defrosting according to the compressor frequency of the air conditioner (1) comprises the following steps:
based on the set temperature, the outdoor environment temperature and the indoor environment temperature, inquiring corresponding target compressor frequency by utilizing the first corresponding relation;
if the compressor frequency of the air conditioner (1) is greater than the target compressor frequency, starting automatic defrosting;
and when the outdoor environment temperature does not belong to a preset temperature zone or the absolute difference between the indoor environment temperature and the set temperature exceeds a preset value, judging whether to start defrosting according to the change condition of the heating output of the air conditioner (1).
2. Defrost control method according to claim 1, characterized in that a second correspondence between the set temperature, the indoor ambient temperature and a reference heating output at a critical frost factor is stored in the air conditioner (1); the step of judging whether to start defrosting according to the change condition of the heating output of the air conditioner (1) comprises the following steps:
acquiring the real-time heating output of the air conditioner (1);
based on the set temperature and the indoor environment temperature, inquiring corresponding target reference heating output quantity by utilizing the second corresponding relation;
comparing the heating output with the target reference heating output to determine whether to initiate defrosting.
3. The defrost control method of claim 2, wherein said step of comparing the heating output to the target reference heating output to determine whether to initiate defrost comprises:
according to the heating output quantity and the target reference heating output quantity, a formula is utilized:
a＝|Q1-Q2|/Q1
calculating a corresponding attenuation rate; wherein a represents the decay rate; q1Represents the target reference heating output; q2Representing said heating output;
and when the attenuation rate is not less than the preset attenuation proportion, judging to perform automatic defrosting.
4. Defrost control method according to claim 2, characterized in that said step of obtaining real time heating output of said air conditioner (1) comprises:
acquiring the heat exchange coefficient, the effective heat exchange area, the inlet air temperature, the outlet air temperature and the condensation temperature of the air conditioner (1);
and calculating the heating output quantity according to the heat exchange coefficient, the effective heat exchange area, the temperature of the inlet air, the temperature of the outlet air and the condensation temperature.
5. A defrost control device, characterized in that, applied to an air conditioner (1), the defrost control device (5) comprises:
the acquisition module (6) is used for acquiring the outdoor environment temperature, the indoor environment temperature and the set temperature;
the judging module (7) is used for judging whether defrosting is started or not according to the frequency of a compressor of the air conditioner (1) when the outdoor environment temperature belongs to a preset temperature interval and the absolute difference between the indoor environment temperature and the set temperature does not exceed a preset value;
the air conditioner (1) is stored with a first corresponding relation among the set temperature, the outdoor environment temperature, the indoor environment temperature and a reference compressor frequency under a critical frost layer coefficient, and the judging module (7) comprises:
the first query submodule is used for querying the corresponding target compressor frequency by utilizing the first corresponding relation based on the set temperature, the outdoor environment temperature and the indoor environment temperature;
a decision submodule for starting an automatic defrost if the compressor frequency of the air conditioner (1) is greater than the target compressor frequency;
the judging module (7) is further used for judging whether defrosting is started or not according to the change condition of the heating output of the air conditioner (1) when the outdoor environment temperature does not belong to a preset temperature zone or the absolute difference between the indoor environment temperature and the set temperature exceeds a preset value.
6. Defrost control apparatus according to claim 5, characterized in that a second correspondence between the set temperature, the indoor ambient temperature and a reference heating output at a critical frost factor is stored in the air conditioner (1); the judging module (7) comprises:
the obtaining submodule is used for obtaining the real-time heating output of the air conditioner (1);
a second query submodule, configured to query a corresponding target reference heating output amount by using the second correspondence relationship based on the set temperature and the indoor environment temperature;
a comparison submodule for comparing the heating output with the target reference heating output to determine whether to initiate defrosting.
7. An air conditioner comprising a processor and a memory (2), the memory (2) storing machine executable instructions executable by the processor, the processor being configured to perform the method of any one of claims 1 to 4.
8. A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out the method of any one of claims 1-4.
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| CN113739350B (en) * | 2021-09-23 | 2022-05-03 | 宁波奥克斯电气股份有限公司 | Low-temperature heating frequency conversion control method and device, storage medium and air conditioner |
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| CN102759237B (en) * | 2011-04-25 | 2014-07-23 | 珠海格力电器股份有限公司 | Heat pump type air conditioner, and defrosting control method and defrosting control device thereof |
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