CN112413820A - Air conditioner defrosting method and device, air conditioning equipment and computer readable storage medium - Google Patents
Air conditioner defrosting method and device, air conditioning equipment and computer readable storage medium Download PDFInfo
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- CN112413820A CN112413820A CN202011330253.7A CN202011330253A CN112413820A CN 112413820 A CN112413820 A CN 112413820A CN 202011330253 A CN202011330253 A CN 202011330253A CN 112413820 A CN112413820 A CN 112413820A
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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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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/65—Electronic processing for selecting an operating mode
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2110/00—Control inputs relating to air properties
- F24F2110/10—Temperature
- F24F2110/12—Temperature of the outside air
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2140/00—Control inputs relating to system states
- F24F2140/20—Heat-exchange fluid temperature
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Abstract
The invention discloses an air conditioner defrosting method and device, air conditioning equipment and a computer readable storage medium. Wherein, the method comprises the following steps: acquiring fin parameters and surface coating material parameters of the air source heat pump; when the air source heat pump performs heating cycle and the outdoor environment temperature is lower than the preset temperature, acquiring outdoor environment parameters and parameters of a heat pump system, and calculating the current frosting rate of the outdoor heat exchanger according to the fin parameters, the surface coating material parameters, the outdoor environment parameters and the parameters of the heat pump system; and comparing the current frosting rate with a preset frosting rate, and if the current frosting rate is higher than the preset frosting rate, carrying out defrosting operation. By the invention, the defrosting starting time can be accurately judged.
Description
Technical Field
The invention relates to the technical field of air conditioners, in particular to an air conditioner defrosting method and device, air conditioning equipment and a computer readable storage medium.
Background
Patent No. CN106871338A discloses a defrosting control method for an air conditioner, but this control method is only obtained by determining the current outdoor environment humidity and taking the current outdoor coil temperature to determine the frosting time of the outdoor heat exchanger. The judgment method has the defects of single judgment basis and large error, and is not practical when applied to actual conditions. The patent No. CN106288144A only determines the frosting time of the outdoor heat exchanger by determining the wind speed, wind pressure and fan current of the outdoor heat exchanger. Also, the judgment basis is too single to accurately judge the frosting time. Aiming at the problem that the judgment of the defrosting starting time of the air conditioner in the prior art is inaccurate, an effective solution is not provided at present.
Disclosure of Invention
The embodiment of the invention provides a defrosting method, a defrosting device, air conditioning equipment and a computer readable storage medium, which are used for solving the problem that the defrosting starting time of an air conditioner is not accurate in the prior art.
In order to achieve the purpose, the invention adopts the following technical scheme:
a method of defrosting an air conditioner, the method comprising: acquiring fin parameters and surface coating material parameters of an air source heat pump; when the air source heat pump performs heating circulation and the outdoor environment temperature is lower than the preset temperature, acquiring outdoor environment parameters and parameters of a heat pump system, and calculating the current frosting rate of the outdoor heat exchanger according to the fin parameters, the surface coating material parameters, the outdoor environment parameters and the parameters of the heat pump system; and comparing the current frosting rate with a preset frosting rate, and if the current frosting rate is higher than the preset frosting rate, carrying out defrosting operation.
Optionally, the outdoor environment parameters include outdoor temperature and outdoor humidity; the parameters of the heat pump system comprise the wind speed of a fan, the temperature of an inlet and an outlet of a refrigerant passing through an evaporator and the surface temperature of an outdoor heat exchanger.
Optionally, calculating a current frosting rate of the outdoor heat exchanger according to the fin parameter, the surface coating material parameter, the outdoor environment parameter, and the parameter of the heat pump system, including: weighting the fin parameters, the surface coating material parameters, the outdoor temperature, the outdoor humidity, the fan air speed, the inlet and outlet temperature of the refrigerant passing through the evaporator and the surface temperature of the outdoor heat exchanger according to the influence of the refrigerant on the frosting rate to obtain corresponding coefficients; and calculating according to the coefficient corresponding to each parameter to obtain the current frosting rate.
Optionally, the current frosting rate is compared with a preset frosting rate, and if the current frosting rate is higher than the preset frosting rate, the defrosting operation is performed, including: the preset frosting rate is divided into a plurality of preset frosting rate intervals, the preset frosting rate interval where the current frosting rate is located is judged, and the defrosting operation of the corresponding degree is carried out according to the preset frosting rate interval where each current frosting rate is located.
Optionally, the defrosting operation of the corresponding degree is performed according to a preset frosting rate interval in which each current frosting rate is located, including: the method comprises the steps of controlling an air source heat pump to normally operate for a first frosting time and then stopping the air source heat pump for a first preset time, and controlling a fan to operate for a first preset time in a preset windshield mode; or after the air source heat pump is controlled to normally operate for the second frosting time, the fan is controlled to stop for the second preset time, and the four-way valve is controlled to change direction and keep the second preset time.
In another aspect, the present invention further provides an air conditioner defrosting apparatus, including: the acquisition module is used for acquiring fin parameters and surface coating material parameters of the air source heat pump; the data processing module is used for acquiring outdoor environment parameters and parameters of the heat pump system when the air source heat pump performs heating circulation and the outdoor environment temperature is lower than the preset temperature, and calculating the current frosting rate of the outdoor heat exchanger according to the fin parameters, the surface coating material parameters, the outdoor environment parameters and the parameters of the heat pump system; and the execution module compares the current frosting rate with a preset frosting rate, and performs defrosting operation if the current frosting rate is higher than the preset frosting rate.
Optionally, the execution module includes: and the judging unit is used for dividing the preset frosting rate into a plurality of preset frosting rate intervals, judging the preset frosting rate interval in which the current frosting rate is positioned, and carrying out defrosting operation of corresponding degree according to the preset frosting rate interval in which each current frosting rate is positioned.
Optionally, the determining unit includes: the first control unit controls the air source heat pump to normally operate for a first frosting time and then stop for a first preset time, and controls the fan to operate for a first preset time in a preset windshield mode; or the second control unit controls the fan to stop for a second preset time after the air source heat pump is controlled to normally operate for the second frosting time, and controls the four-way valve to reverse and keep the second preset time.
In order to achieve the above object, the present invention further provides an air conditioning apparatus including the above defrosting device for an air conditioner.
In order to achieve the above object, the present invention also provides a computer-readable storage medium having stored thereon a computer program which, when executed by a processor, implements the above-described air conditioner defrosting method.
According to the technical scheme, compared with the prior art, the fin parameters, the surface coating material parameters, the outdoor environment parameters and the parameters of the heat pump system of the air source heat pump are used as calculation coefficients, the accurate current frosting rate is obtained through calculation, whether defrosting is carried out or not is judged according to the current frosting rate, and therefore the purpose of accurately judging the defrosting starting time is achieved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a flowchart of an air conditioner defrosting method according to an embodiment of the present invention;
FIG. 2 is a flow chart for determining a frosting level of an outdoor heat exchanger based on a calculated current frosting rate according to an embodiment of the present invention;
fig. 3 is a flowchart of a defrosting operation by selecting a defrosting mode corresponding to a frosting degree according to the frosting degree according to an embodiment of the present invention;
fig. 4 is a block diagram of the construction of an air conditioner defrosting apparatus according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be described in further detail with reference to the accompanying drawings, and it is apparent that the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Aiming at the problems in the prior art, the embodiment of the invention provides an air conditioner defrosting method, which solves the problem of accurately judging the defrosting starting time of an air conditioner.
The terminology used in the embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the examples of the present invention and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise, and "a plurality" typically includes at least two.
It should be understood that the term "and/or" as used herein is merely one type of association that describes an associated object, meaning that three relationships may exist, e.g., a and/or B may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.
The words "if", as used herein, may be interpreted as "at … …" or "at … …" or "in response to a determination" or "in response to a detection", depending on the context. Similarly, the phrases "if determined" or "if detected (a stated condition or event)" may be interpreted as "when determined" or "in response to a determination" or "when detected (a stated condition or event)" or "in response to a detection (a stated condition or event)", depending on the context.
It is also noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that an article or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such article or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in the article or device in which the element is included.
Alternative embodiments of the present invention are described in detail below with reference to the accompanying drawings.
Example 1
Fig. 1 is a flowchart of a defrosting method of an air conditioner according to an embodiment of the present invention, as shown in fig. 1, the method including the steps of:
s101, acquiring fin parameters and surface coating material parameters of an air source heat pump;
specifically, the fin parameters include fin type, fin pitch, chamfer, and fin material. The types of the air source heat pumps used by users are different, and the same control is practical, so that a defrosting scheme most suitable for the air source heat pump of the type can be obtained by inputting relevant parameters such as the fin type, the fin spacing and the chamfer angle of the used air source heat pump, fin materials, surface coating materials and the like into an established model.
Step S102, when the air source heat pump performs heating circulation and the outdoor environment temperature is lower than the preset temperature, acquiring outdoor environment parameters and parameters of a heat pump system, and calculating the current frosting rate of the outdoor heat exchanger according to the fin parameters, the surface coating material parameters, the outdoor environment parameters and the parameters of the heat pump system;
specifically, the outdoor environment parameters and the parameters of the heat pump system are obtained and substituted into a preset model in the last step to calculate the frosting rate of the evaporator.
And step S103, comparing the current frosting rate with a preset frosting rate, and if the current frosting rate is higher than the preset frosting rate, carrying out defrosting operation.
The fin parameters, the surface coating material parameters, the outdoor environment parameters and the parameters of the heat pump system of the air source heat pump are used as calculation coefficients, the accurate current frosting rate is obtained through calculation, whether defrosting is carried out or not is judged according to the current frosting rate, and therefore the defrosting starting time is accurately judged.
Further preferably, the outdoor environment parameters include outdoor temperature and outdoor humidity; the parameters of the heat pump system comprise the wind speed of a fan, the temperature of an inlet and an outlet of a refrigerant passing through an evaporator and the surface temperature of an outdoor heat exchanger.
The outdoor temperature and the outdoor humidity under the outdoor environment of different environments are different, the outdoor temperature and the outdoor humidity are important parameters for judging the frosting rate, and the accuracy of the judged frosting rate can be improved by acquiring the outdoor temperature and the outdoor humidity. The air speed of the fan, the temperature of the refrigerant passing through the inlet and the outlet of the evaporator and the surface temperature of the outdoor heat exchanger are closely related to the frosting rate, and when the collected related parameters are more accurate, the finally calculated frosting rate is more accurate.
Further preferably, calculating the current frosting rate of the outdoor heat exchanger according to the fin parameter, the surface coating material parameter, the outdoor environment parameter and the parameter of the heat pump system includes:
weighting the fin parameters, the surface coating material parameters, the outdoor temperature, the outdoor humidity, the fan air speed, the inlet and outlet temperature of the refrigerant passing through the evaporator and the surface temperature of the outdoor heat exchanger according to the influence of the refrigerant on the frosting rate to obtain corresponding coefficients; and calculating according to the coefficient corresponding to each parameter to obtain the current frosting rate.
The fin parameters, the surface coating material parameters, the outdoor temperature, the outdoor humidity, the fan air speed, the inlet and outlet temperature of the refrigerant passing through the evaporator and the surface temperature of the outdoor heat exchanger have different influences on the frosting rate, and the frosting rate which best meets the actual condition is obtained by performing weighted calculation according to the influence of each parameter on the frosting rate, so that the frosting starting time is accurately judged. Experiments and simulation can determine that the influence of each parameter on the frosting rate is in positive correlation once or multiple positive correlations, and the weight corresponding to each parameter needs to be determined according to the positive correlation influence times of each parameter on the frosting rate.
In one possible implementation, the fan air speed can be replaced by the fan air volume, the fan current and the air pressure at the two sides of the outdoor heat exchanger. The correlation calculation model needs to be re-established after the substitution.
Further preferably, the comparing the current frosting rate with the preset frosting rate, and if the current frosting rate is higher than the preset frosting rate, performing a defrosting operation, including: the preset frosting rate is divided into a plurality of preset frosting rate intervals, the preset frosting rate interval where the current frosting rate is located is judged, and the defrosting operation of the corresponding degree is carried out according to the preset frosting rate interval where each current frosting rate is located.
Specifically, the preset rate is divided into five intervals, wherein the first preset rate is smaller than the second preset rate and smaller than the third preset rate and smaller than the fourth preset rate, and the first to fourth preset rates can be calibrated according to actual conditions, for example, can be obtained through a large number of experimental tests.
When the current frosting rate is less than or equal to a first preset rate, judging that the outdoor heat exchanger is not frosted;
when the current frosting rate is greater than or equal to a first preset rate and less than a second preset rate, judging that the frosting degree of the outdoor heat exchanger is a first frosting level;
when the current frosting rate is greater than or equal to a second preset rate and less than a third preset rate, judging that the frosting degree of the outdoor heat exchanger is a second frosting level;
when the current frosting rate is greater than or equal to a third preset rate and less than a fourth preset rate, judging that the frosting degree of the outdoor heat exchanger is a third frosting grade;
and when the current frosting rate is greater than or equal to a fourth preset rate, judging that the frosting degree of the outdoor heat exchanger is a fourth frosting level.
Specifically, as shown in fig. 2, fig. 2 is a flowchart for determining the frosting degree of the outdoor heat exchanger according to the calculated current frosting rate according to the embodiment of the present invention.
(1) Acquiring the temperature and humidity of an outdoor environment, the temperature of a refrigerant at an inlet and an outlet of an evaporator, the surface temperature of an outdoor heat exchanger and the wind speed of a fan;
(2) obtaining the frosting rate v2 of the evaporator through simulation calculation;
(3) comparing with a preset frosting rate v 1;
(4) and judging whether v2< K1 v1 is established or not. If yes, judging the defrosting degree as no defrosting is needed; if not, the next judgment is carried out;
(5) and judging whether K1 v1 is not more than v2 and K2 v1 are true or not. If yes, judging that the defrosting degree is a first defrosting grade; if not, the next judgment is carried out;
(6) and judging whether K2 v1 is not more than v2 and K3 v1 are true or not. If yes, judging that the defrosting degree is a second defrosting grade; if not, the next judgment is carried out;
(7) and judging whether K3 v1 is not more than v2 and K4 v1 are true or not. If yes, judging that the defrosting degree is a third defrosting grade; if not, the next judgment is carried out;
(8) and judging whether K4 v1 is not more than v 2. If yes, judging that the defrosting degree is a fourth defrosting grade;
(9) and carrying out corresponding defrosting operation according to the judged defrosting degree.
And judging the defrosting grade according to the actual frosting condition, and selecting the defrosting grade most suitable for the current frosting rate, so that intelligent defrosting is realized, and the defrosting times are reduced.
Further preferably, the defrosting operation of the corresponding degree is performed according to a preset frosting rate interval in which each current frosting rate is located, and the defrosting operation includes: the method comprises the steps of controlling an air source heat pump to normally operate for a first frosting time and then stopping the air source heat pump for a first preset time, and controlling a fan to operate for a first preset time in a preset windshield mode; or after the air source heat pump is controlled to normally operate for the second frosting time, the fan is controlled to stop for the second preset time, and the four-way valve is controlled to change direction and keep the second preset time.
Specifically, if the defrosting grade of the outdoor heat exchanger is a first defrosting grade, a first grade defrosting operation is selected, the first grade defrosting operation comprises controlling a compressor to stop for a first preset time after the system normally operates for a first defrosting time, and controlling an outdoor fan to operate for the first preset time at a preset wind gear;
if the defrosting grade of the outdoor heat exchanger is a second defrosting grade, selecting second-grade defrosting operation, controlling the outdoor fan to stop for a second preset time after the system normally operates for a second frosting time, and controlling the four-way valve to change direction and keep the second preset time;
if the defrosting grade of the outdoor heat exchanger is a third defrosting grade, selecting third grade defrosting operation, controlling an outdoor fan to stop for a third preset time after the system normally operates for a third frosting time, and controlling a four-way valve to reverse and keep the third preset time;
and if the defrosting grade of the outdoor heat exchanger is the fourth defrosting grade, selecting fourth grade defrosting operation, wherein the fourth defrosting operation comprises the fourth preset time of stopping the outdoor fan after the control system normally operates for the fourth frosting time, and controlling the four-way valve to change direction and keep the fourth preset time.
The first frosting time is longer than the second frosting time, the second frosting time is longer than the third frosting time, the third frosting time is longer than the fourth frosting time, and the first to fourth frosting times can be calibrated according to actual conditions. The third preset time is longer than the second preset time, the fourth preset time is longer than the third preset time, and the first preset time to the fourth preset time can be calibrated according to actual conditions.
Fig. 3 is a flowchart of a defrosting operation performed by selecting a defrosting mode corresponding to a frosting degree according to the frosting degree according to an embodiment of the present invention. The defrost cycle steps are as follows:
(1) the heat pump is powered up.
(2) It is determined whether the heat pump is operating in a heating mode. If yes, executing the next judgment; if not, returning to judge whether the heat pump operates in the heating mode or not.
(3) It is determined whether the outdoor ambient temperature is less than a preset temperature T1. If yes, acquiring the defrosting grade of the outdoor heat exchanger; if not, returning to judge whether the outdoor environment temperature is less than the preset temperature T1.
(4) And acquiring the defrosting grade of the outdoor heat exchanger.
(5) And judging whether the defrosting grade of the outdoor heat exchanger is defrosting-free or not. If yes, judging from the new power-on to the heat pump; if not, the next judgment is carried out.
(6) And judging whether the defrosting grade of the outdoor heat exchanger is the first defrosting grade or not. If yes, executing a first-level defrosting operation; if not, the next judgment is carried out. Wherein the first stage defrosting operation is that the compressor still works normally for t1 time, and the compressor is controlled to stop t after t1 timec1Time and control the outdoor fan to preset the operation t of the windshield F1c1Time, when t is reachedc1And when the time is less than the preset time, the compressor and the fan are recovered to normal operation, and the heat pump exits the defrosting cycle to perform a new round of judgment. That is, when the frost layer is thin, the heat pump stops heating for a period of time, and the purpose of defrosting is achieved by increasing the wind speed of the outdoor fan.
(7) And judging whether the defrosting grade of the outdoor heat exchanger is a second defrosting grade. If yes, executing a second-stage defrosting operation; if not, the next judgment is carried out. Wherein, the second grade defrosting operation is that the compressor still works normally for t2 time, when t2 time is reached, the four-way reversing valve is controlled to reverse, and then the outdoor fan is stopped tc2Time, when t is reachedc2And when the time is less than the preset time, the fan returns to normal operation, the four-way valve is controlled to change the direction, and the heat pump exits the defrosting cycle to judge a new cycle.
(8) And judging whether the defrosting grade of the outdoor heat exchanger is a third defrosting grade. If yes, executing a third-level defrosting operation; if not, the next judgment is carried out. Wherein, the third grade defrosting operation is that the compressor still works normally for t3 time, when t3 time is reached, the four-way reversing valve is controlled to reverse, and then the outdoor fan is stopped tc3Time, when t is reachedc3And when the time is less than the preset time, the fan returns to normal operation, the four-way valve is controlled to change the direction, and the heat pump exits the defrosting cycle to judge a new cycle.
(9) And judging whether the defrosting grade of the outdoor heat exchanger is a fourth defrosting grade. If so, a fourth level defrost operation is performed. Wherein the fourth-stage defrosting operationNamely, the compressor still works normally for t4 time, the four-way reversing valve is controlled to reverse after t4 time is reached, and then the outdoor fan is stopped for tc4Time, when t is reachedc4And when the time is less than the preset time, the fan returns to normal operation, the four-way valve is controlled to change the direction, and the heat pump exits the defrosting cycle to judge a new cycle.
It is understood that in the embodiment of the present invention, the defrosting mode may also include other modes, such as defrosting by an auxiliary heat source, or defrosting by reversing the four-way valve and increasing the rotation speed of the outdoor fan, and the like, and may be specifically set according to actual situations.
The defrosting operation corresponding to the frosting degree is selected according to the frosting degree to defrost, so that the purpose of intelligent defrosting is achieved, the defrosting times are reduced, the times of blowing cold air by an indoor fan can be effectively reduced, the heating capacity of the air conditioner is improved, the user experience is improved, the reversing times of the four-way valve can be reduced, the service life is prolonged, meanwhile, the use of an auxiliary heat source can be reduced, and energy is saved.
As shown in fig. 4, in another aspect, the present invention also provides an air conditioner defrosting apparatus, including:
the acquisition module 101 is used for acquiring fin parameters and surface coating material parameters of the air source heat pump;
specifically, the fin parameters include fin type, fin pitch, chamfer, and fin material. The types of the air source heat pumps used by users are different, and the same control is practical, so that a defrosting scheme most suitable for the air source heat pump of the type can be obtained by inputting relevant parameters such as the fin type, the fin spacing and the chamfer angle of the used air source heat pump, fin materials, surface coating materials and the like into an established model.
The data processing module 102 is used for acquiring outdoor environment parameters and parameters of the heat pump system when the air source heat pump performs heating cycle and the outdoor environment temperature is lower than the preset temperature, and calculating the current frosting rate of the outdoor heat exchanger according to the fin parameters, the surface coating material parameters, the outdoor environment parameters and the parameters of the heat pump system;
specifically, the outdoor environment parameters and the parameters of the heat pump system are obtained and substituted into a preset model in the last step to calculate the frosting rate of the evaporator.
The execution module 103 compares the current frosting rate with a preset frosting rate, and performs a defrosting operation if the current frosting rate is higher than the preset frosting rate.
The fin parameters, the surface coating material parameters, the outdoor environment parameters and the parameters of the heat pump system of the air source heat pump are used as calculation coefficients, the accurate current frosting rate is obtained through calculation, whether defrosting is carried out or not is judged according to the current frosting rate, and therefore the defrosting starting time is accurately judged.
Further preferably, the execution module includes: and the judging unit is used for dividing the preset frosting rate into a plurality of preset frosting rate intervals, judging the preset frosting rate interval in which the current frosting rate is positioned, and carrying out defrosting operation of corresponding degree according to the preset frosting rate interval in which each current frosting rate is positioned.
Specifically, the preset rate is divided into five intervals, wherein the first preset rate is smaller than the second preset rate and smaller than the third preset rate and smaller than the fourth preset rate, and the first to fourth preset rates can be calibrated according to actual conditions, for example, can be obtained through a large number of experimental tests.
When the current frosting rate is less than or equal to a first preset rate, judging that the outdoor heat exchanger is not frosted;
when the current frosting rate is greater than or equal to a first preset rate and less than a second preset rate, judging that the frosting degree of the outdoor heat exchanger is a first frosting level;
when the current frosting rate is greater than or equal to a second preset rate and less than a third preset rate, judging that the frosting degree of the outdoor heat exchanger is a second frosting level;
when the current frosting rate is greater than or equal to a third preset rate and less than a fourth preset rate, judging that the frosting degree of the outdoor heat exchanger is a third frosting grade;
and when the current frosting rate is greater than or equal to a fourth preset rate, judging that the frosting degree of the outdoor heat exchanger is a fourth frosting level.
Specifically, as shown in fig. 2, fig. 2 is a flowchart for determining the frosting degree of the outdoor heat exchanger according to the calculated current frosting rate according to the embodiment of the present invention.
(1) Acquiring the temperature and humidity of an outdoor environment, the temperature of a refrigerant at an inlet and an outlet of an evaporator, the surface temperature of an outdoor heat exchanger and the wind speed of a fan;
(2) obtaining the frosting rate v2 of the evaporator through simulation calculation;
(3) comparing with a preset frosting rate v 1;
(4) and judging whether v2< K1 v1 is established or not. If yes, judging the defrosting degree as no defrosting is needed; if not, the next judgment is carried out;
(5) and judging whether K1 v1 is not more than v2 and K2 v1 are true or not. If yes, judging that the defrosting degree is a first defrosting grade; if not, the next judgment is carried out;
(6) and judging whether K2 v1 is not more than v2 and K3 v1 are true or not. If yes, judging that the defrosting degree is a second defrosting grade; if not, the next judgment is carried out;
(7) and judging whether K3 v1 is not more than v2 and K4 v1 are true or not. If yes, judging that the defrosting degree is a third defrosting grade; if not, the next judgment is carried out;
(8) and judging whether K4 v1 is not more than v 2. If yes, judging that the defrosting degree is a fourth defrosting grade;
(9) and carrying out corresponding defrosting operation according to the judged defrosting degree.
And judging the defrosting grade according to the actual frosting condition, and selecting the defrosting grade most suitable for the current frosting rate, so that intelligent defrosting is realized, and the defrosting times are reduced.
Further preferably, the judging unit includes: the first control unit controls the air source heat pump to normally operate for a first frosting time and then stop for a first preset time, and controls the fan to operate for a first preset time in a preset windshield mode; or the second control unit controls the fan to stop for a second preset time after the air source heat pump is controlled to normally operate for the second frosting time, and controls the four-way valve to reverse and keep the second preset time.
Specifically, if the defrosting grade of the outdoor heat exchanger is a first defrosting grade, a first grade defrosting cycle is selected, the first grade defrosting cycle comprises the steps of controlling the compressor to stop for a first preset time after the system normally operates for a first defrosting time, and controlling the outdoor fan to operate for the first preset time at a preset wind gear;
if the defrosting grade of the outdoor heat exchanger is a second defrosting grade, selecting a second grade defrosting cycle, controlling the outdoor fan to stop for a second preset time after the system normally operates for a second frosting time, and controlling the four-way valve to change direction and keep the second preset time;
if the defrosting grade of the outdoor heat exchanger is a third defrosting grade, selecting a third grade defrosting cycle, controlling an outdoor fan to stop for a third preset time after the third defrosting time of the normal operation of the system, and controlling a four-way valve to change direction and keep the third preset time;
and if the defrosting grade of the outdoor heat exchanger is the fourth defrosting grade, selecting a fourth grade defrosting cycle, stopping the outdoor fan for a fourth preset time after the control system normally operates for the fourth frosting time, and controlling the four-way valve to change the direction and keep the fourth preset time.
The first frosting time is longer than the second frosting time, the second frosting time is longer than the third frosting time, the third frosting time is longer than the fourth frosting time, and the first to fourth frosting times can be calibrated according to actual conditions. The third preset time is longer than the second preset time, the fourth preset time is longer than the third preset time, and the first preset time to the fourth preset time can be calibrated according to actual conditions.
Fig. 3 is a flowchart of a defrosting operation performed by selecting a defrosting mode corresponding to a frosting degree according to the frosting degree according to an embodiment of the present invention. The defrost cycle steps are as follows:
(1) the heat pump is powered up.
(2) It is determined whether the heat pump is operating in a heating mode. If yes, executing the next judgment; if not, returning to judge whether the heat pump operates in the heating mode or not.
(3) It is determined whether the outdoor ambient temperature is less than a preset temperature T1. If yes, acquiring the defrosting grade of the outdoor heat exchanger; if not, returning to judge whether the outdoor environment temperature is less than the preset temperature T1.
(4) And acquiring the defrosting grade of the outdoor heat exchanger.
(5) And judging whether the defrosting grade of the outdoor heat exchanger is defrosting-free or not. If yes, judging from the new power-on to the heat pump; if not, the next judgment is carried out.
(6) And judging whether the defrosting grade of the outdoor heat exchanger is the first defrosting grade or not. If yes, executing a first-level defrosting operation; if not, the next judgment is carried out. Wherein the first stage defrosting operation is that the compressor still works normally for t1 time, and the compressor is controlled to stop t after t1 timec1Time and control the outdoor fan to preset the operation t of the windshield F1c1Time, when t is reachedc1And when the time is less than the preset time, the compressor and the fan are recovered to normal operation, and the heat pump exits the defrosting cycle to perform a new round of judgment. That is, when the frost layer is thin, the heat pump stops heating for a period of time, and the purpose of defrosting is achieved by increasing the wind speed of the outdoor fan.
(7) And judging whether the defrosting grade of the outdoor heat exchanger is a second defrosting grade. If yes, executing a second-stage defrosting operation; if not, the next judgment is carried out. Wherein, the second grade defrosting operation is that the compressor still works normally for t2 time, when t2 time is reached, the four-way reversing valve is controlled to reverse, and then the outdoor fan is stopped tc2Time, when t is reachedc2And when the time is less than the preset time, the fan returns to normal operation, the four-way valve is controlled to change the direction, and the heat pump exits the defrosting cycle to judge a new cycle.
(8) And judging whether the defrosting grade of the outdoor heat exchanger is a third defrosting grade. If yes, executing a third-level defrosting operation; if not, the next judgment is carried out. Wherein, the third grade defrosting operation is that the compressor still works normally for t3 time, when t3 time is reached, the four-way reversing valve is controlled to reverse, and then the outdoor fan is stopped tc3Time, when t is reachedc3And when the time is less than the preset time, the fan returns to normal operation, the four-way valve is controlled to change the direction, and the heat pump exits the defrosting cycle to judge a new cycle.
(9) And judging whether the defrosting grade of the outdoor heat exchanger is a fourth defrosting grade. If so, a fourth level defrost operation is performed. Wherein the fourth stage defrost operation isWhen the time t4 that the compressor still works normally reaches t4, the four-way reversing valve is controlled to reverse, and then the outdoor fan is stopped tc4Time, when t is reachedc4And when the time is less than the preset time, the fan returns to normal operation, the four-way valve is controlled to change the direction, and the heat pump exits the defrosting cycle to judge a new cycle.
It is understood that in the embodiment of the present invention, the defrosting mode may also include other modes, such as defrosting by an auxiliary heat source, or defrosting by reversing the four-way valve and increasing the rotation speed of the outdoor fan, and the like, and may be specifically set according to actual situations.
The defrosting operation corresponding to the frosting degree is selected according to the frosting degree to defrost, so that the purpose of intelligent defrosting is achieved, the defrosting times are reduced, the times of blowing cold air by an indoor fan can be effectively reduced, the heating capacity of the air conditioner is improved, the user experience is improved, the reversing times of the four-way valve can be reduced, the service life is prolonged, meanwhile, the use of an auxiliary heat source can be reduced, and the energy is saved.
The invention also provides air conditioning equipment comprising the air conditioning defrosting device.
The present invention also provides a computer-readable storage medium having stored thereon a computer program which, when executed by a processor, implements the above-described air conditioner defrosting method.
The storage medium stores the software, and the storage medium includes but is not limited to: optical disks, floppy disks, hard disks, erasable memory, etc.
The technical scheme has the following technical effects: the fin parameters, the surface coating material parameters, the outdoor environment parameters and the parameters of the heat pump system of the air source heat pump are used as related calculation coefficients to obtain the accurate current frosting rate, and whether defrosting is carried out or not is judged according to the current frosting rate, so that the aim of accurately judging the defrosting starting time is fulfilled. The defrosting operation corresponding to the frosting degree is selected according to the frosting degree to defrost, so that the purpose of intelligent defrosting is achieved, the defrosting times are reduced, the times of blowing cold air by an indoor fan can be effectively reduced, the heating capacity of the air conditioner is improved, the user experience is improved, the reversing times of the four-way valve can be reduced, the service life is prolonged, meanwhile, the use of an auxiliary heat source can be reduced, and the energy is saved.
The product can execute the method provided by the embodiment of the invention, and has corresponding functional modules and beneficial effects of the execution method. For technical details that are not described in detail in this embodiment, reference may be made to the method provided by the embodiment of the present invention.
The above-described embodiments of the apparatus are merely illustrative, and the units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment.
Through the above description of the embodiments, those skilled in the art will clearly understand that each embodiment can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware. With this understanding in mind, the above-described technical solutions may be embodied in the form of a software product, which can be stored in a computer-readable storage medium such as ROM/RAM, magnetic disk, optical disk, etc., and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the methods described in the embodiments or some parts of the embodiments.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. An air conditioner defrosting method, characterized in that the method comprises the following steps:
acquiring fin parameters and surface coating material parameters of an air source heat pump;
when the air source heat pump performs heating circulation and the outdoor environment temperature is lower than the preset temperature, acquiring outdoor environment parameters and parameters of a heat pump system, and calculating the current frosting rate of the outdoor heat exchanger according to the fin parameters, the surface coating material parameters, the outdoor environment parameters and the parameters of the heat pump system;
and comparing the current frosting rate with a preset frosting rate, and if the current frosting rate is higher than the preset frosting rate, carrying out defrosting operation.
2. An air conditioner defrosting method according to claim 1, characterized in that:
the outdoor environment parameters comprise outdoor temperature and outdoor humidity;
the parameters of the heat pump system comprise the wind speed of a fan, the temperature of an inlet and an outlet of a refrigerant passing through an evaporator and the surface temperature of an outdoor heat exchanger.
3. The air conditioner defrosting method according to claim 2, wherein the calculating the current frosting rate of the outdoor heat exchanger according to the fin parameter, the surface coating material parameter, the outdoor environment parameter and the parameter of the heat pump system comprises:
weighting the fin parameters, the surface coating material parameters, the outdoor temperature, the outdoor humidity, the fan air speed, the temperature of an inlet and an outlet of the refrigerant passing through an evaporator and the surface temperature of the outdoor heat exchanger respectively according to the influence of the temperature on the defrosting rate to obtain corresponding coefficients;
and calculating according to the coefficient corresponding to each parameter to obtain the current frosting rate.
4. The air conditioner defrosting method according to claim 1, wherein the comparing the current frosting rate with a preset frosting rate, and if the current frosting rate is higher than the preset frosting rate, performing a defrosting operation comprises:
the preset frosting rate is divided into a plurality of preset frosting rate intervals, the preset frosting rate interval in which the current frosting rate is positioned is judged, and the defrosting operation of the corresponding degree is carried out according to the preset frosting rate interval in which each current frosting rate is positioned.
5. The air conditioner defrosting method according to claim 4, wherein the defrosting operation of the corresponding degree is performed according to the preset defrosting rate interval in which each current defrosting rate is located, and the method comprises the following steps:
controlling the air source heat pump to normally operate for a first frosting time and then stopping for a first preset time, and controlling the fan to operate for a first preset time in a preset windshield mode;
or after the air source heat pump is controlled to normally operate for the second frosting time, the fan is controlled to stop for the second preset time, and the four-way valve is controlled to change direction and keep the second preset time.
6. An air conditioner defrosting apparatus, comprising:
the acquisition module is used for acquiring fin parameters and surface coating material parameters of the air source heat pump;
the data processing module is used for acquiring outdoor environment parameters and parameters of a heat pump system when the air source heat pump performs heating circulation and the outdoor environment temperature is lower than a preset temperature, and calculating the current frosting rate of the outdoor heat exchanger according to the fin parameters, the surface coating material parameters, the outdoor environment parameters and the parameters of the heat pump system;
and the execution module compares the current frosting rate with a preset frosting rate, and performs defrosting operation if the current frosting rate is higher than the preset frosting rate.
7. An air conditioner defroster according to claim 6 wherein said execution module comprises:
and the judging unit is used for dividing the preset frosting rate into a plurality of preset frosting rate intervals, judging the preset frosting rate interval in which the current frosting rate is positioned, and carrying out defrosting operation of corresponding degree according to the preset frosting rate interval in which each current frosting rate is positioned.
8. An air conditioner defroster according to claim 7, wherein said judgment unit comprises:
the first control unit is used for controlling the air source heat pump to normally operate for a first frosting time and then stop for a first preset time, and controlling the fan to operate for a first preset time in a preset windshield mode;
or the second control unit controls the fan to stop for a second preset time after controlling the air source heat pump to normally operate for a second frosting time, and controls the four-way valve to change direction and keep the second preset time.
9. An air conditioning apparatus, characterized by comprising the air conditioning defroster of any one of claims 6 to 8.
10. A computer-readable storage medium on which a computer program is stored, wherein the program, when executed by a processor, implements the air conditioner defrosting method according to any one of claims 1 to 5.
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