CN112303815A - Defrosting control method of air conditioner outdoor unit and air conditioner - Google Patents
Defrosting control method of air conditioner outdoor unit and air conditioner Download PDFInfo
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
- F24F11/41—Defrosting; Preventing freezing
- F24F11/42—Defrosting; Preventing freezing of outdoor units
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/50—Control or safety arrangements characterised by user interfaces or communication
- F24F11/61—Control or safety arrangements characterised by user interfaces or communication using timers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/64—Electronic processing using pre-stored data
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
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Abstract
The invention belongs to the technical field of air conditioners, and particularly relates to a defrosting control method for an outdoor unit of an air conditioner and the air conditioner. The invention aims to solve the problems that the working performance and the user experience of the air conditioner are seriously influenced because the outdoor unit of the air conditioner does not defrost when defrosting is needed or defrost when defrosting is not needed because the opportunity of defrosting the outdoor unit of the air conditioner is inconsistent with the actual requirement in the conventional air conditioner. For this purpose, the invention calculates the actual frosting amount of the outdoor heat exchanger by comprehensively considering a plurality of factors including the actual air volume of the outdoor unit of the air conditioner, the actual moisture content of the air at the air inlet side, the actual moisture content of the air at the air outlet side and the surface temperature of the outdoor heat exchanger of the outdoor unit of the air conditioner so as to determine whether the outdoor unit of the air conditioner needs defrosting. Therefore, the frosting amount of the outdoor unit of the air conditioner is calculated more accurately and meets the actual defrosting requirement, and the working performance and the user experience of the air conditioner are improved.
Description
Technical Field
The invention belongs to the technical field of air conditioners, and particularly relates to a defrosting control method for an outdoor unit of an air conditioner and the air conditioner.
Background
The air conditioner comprises an air conditioner indoor unit and an air conditioner outdoor unit, when the air conditioner heats the indoor in winter, the air conditioner outdoor unit is used as an evaporator to absorb the outdoor heat, and the air conditioner indoor unit is used as a condenser to release the heat to the indoor. At this time, water vapor in the outdoor air is condensed into water droplets and then frosted when encountering cold on the outdoor heat exchanger of the outdoor unit of the air conditioner, so that the heat exchange capacity between the outdoor heat exchanger and the outdoor air is reduced, and the heating capacity of the air conditioner is further affected, and therefore, the outdoor heat exchanger of the outdoor unit of the air conditioner needs to be defrosted.
Chinese patent application document (CN109237727A) discloses a defrosting control method for an air conditioner: acquiring the surface temperature of an outdoor heat exchanger under the condition that the air conditioner operates in a heating mode; acquiring the inlet air moisture content and the outlet air moisture content of the outdoor heat exchanger; determining the frosting thickness of the outdoor heat exchanger based on the inlet air moisture content and the outlet air moisture content; and judging whether the air conditioner enters a defrosting mode or not according to the surface temperature and the frosting thickness.
However, the existing defrosting control method determines the frosting thickness of the outdoor heat exchanger only through the air inlet moisture content and the air outlet moisture content of the outdoor heat exchanger, and does not consider that the air volume of the outdoor unit of the air conditioner changes when the outdoor heat exchanger is frosted during calculation, so that the calculated frosting thickness is accurate, and the defrosting time of the outdoor unit of the air conditioner is inconsistent with the actual defrosting requirement, so that the outdoor unit of the air conditioner is not defrosted when defrosting is needed or defrosting is not needed, and the working performance of the air conditioner and the use experience of a user are seriously influenced.
Accordingly, there is a need in the art for a new defrost control method for an outdoor unit of an air conditioner and an air conditioner to solve the above-mentioned problems.
Disclosure of Invention
The invention provides a defrosting control method of an air conditioner outdoor unit and the air conditioner, aiming at solving the problems that the outdoor unit of the air conditioner is not defrosted when defrosting is needed or is defrosted when defrosting is not needed, and the working performance and the user experience of the air conditioner are seriously influenced because the defrosting opportunity of the air conditioner outdoor unit is inconsistent with the actual demand in the prior air conditioner.
First, the present invention provides a defrosting control method of an outdoor unit of an air conditioner, the defrosting control method including: obtaining the actual air quantity Q (t) of the outdoor unit of the air conditioner at the frosting time t since the last defrosting is finished and the actual moisture content d of the air at the air inlet sideinAnd the actual moisture content d of the air at the air outlet sideoutAnd obtaining the surface temperature T of the outdoor heat exchanger of the outdoor unit of the air conditionerref(ii) a Based on the actual air quantity Q (t), the actual moisture content d of the air at the air inlet sideinAnd the air on the air outlet side actually contains moistureQuantity doutCalculating the condensation speed m 'of the outdoor heat exchanger'v(T) and based on the outdoor heat exchanger surface temperature TrefDetermining a frosting factor f; m 'based on the condensation speed'w(t) and the frosting factor f calculating the frosting speed m 'of the outdoor heat exchanger'ice(t); m 'based on the frosting speed'ice(t) calculating an actual frosting amount m of the outdoor heat exchanger at the frosting time tice(t); based on the actual frosting amount mice(t) and a preset frosting amount threshold value mmaxAnd determining whether the outdoor unit of the air conditioner needs defrosting.
As a preferable technical scheme of the defrosting control method provided by the invention, the defrosting control method is based on the actual frosting amount mice(t) and a preset frosting amount threshold value mmaxThe step of determining whether the outdoor unit of the air conditioner needs to be defrosted includes: if the actual frosting amount mice(t) and the preset frosting amount threshold mmaxIs greater than a predetermined critical frosting ratio F and/or if said actual frosting amount mice(t) and the preset frosting amount threshold mmaxAnd if the difference value is smaller than the preset critical frosting difference value, determining that the outdoor unit of the air conditioner needs to be defrosted.
As a preferable technical solution of the defrosting control method provided by the present invention, the preset frosting amount threshold mmaxThe calculation formula of (2) is as follows: m ismax＝N·δ·FW·W·ρWater (W)(ii) a Wherein N is the number of fins of the outdoor heat exchanger, δ is the distance between adjacent fins of the outdoor heat exchanger, and FWFor the width of each fin along the distribution direction of the plurality of fins, W is the width of the outdoor heat exchanger along the distribution direction of the plurality of fins, pWater (W)Is the density of water.
As a preferable embodiment of the defrosting control method provided by the present invention, "based on the frosting speed m'ice(t) calculating an actual frosting amount m of the outdoor heat exchanger at the frosting time tice(t) "the calculation formula used is:
as a preferable embodiment of the defrosting control method provided by the present invention, "based on the condensation speed m'w(t) and the frosting factor f calculating the frosting speed m 'of the outdoor heat exchanger'ice(t) "the calculation formula used is: m'ice(t)＝f·m′w(t)。
As a preferable technical solution of the above-mentioned defrosting control method provided by the present invention, "based on the actual air volume q (t), the actual moisture content d of the intake airinAnd the actual moisture content d of the air on the air outlet sideoutCalculating the condensation speed m 'of the outdoor heat exchanger'w(t) "the calculation formula used is:
wherein, cp，aIs dry air with constant pressure specific heat capacity, rhoAir conditionerIs the density of air; and/or "based on the outdoor heat exchanger surface temperature TrefThe step of determining the frosting factor f "comprises: when T isrefWhen f is greater than 0, f is 0; and, when T isrefWhen < 0, f is 1.
As a preferable technical solution of the above defrosting control method provided by the present invention, the actual moisture content d of the air on the intake side isinThe calculation formula of (2) is as follows:
actual moisture content d of air at air outlet sideoutThe calculation formula of (2) is as follows:
wherein, cp，aA constant pressure specific heat capacity for dry air, cp，vIs the specific heat capacity of water vapor at constant pressure, Tw1Is the wet bulb temperature, T, of the air at the air inlet sidew2The wet bulb temperature, T, of the air at the air outlet sided1Is the dry bulb temperature, T, of the air at the air inlet sided2Dry bulb temperature of air at the air outlet side, ds1The air at the air inlet side corresponds to the temperature of the dry bulbSaturated moisture content, ds2The saturated moisture content of the air at the air outlet side is corresponding to the temperature of the dry bulb, and gamma is the latent heat of vaporization of water.
As a preferable technical solution of the defrosting control method provided by the present invention, the wet bulb temperature T of the air on the air outlet sidew2Determined by the following formula: t isw2＝A·Td1+B·Ps+C·Ps2+D·ln(Tref) (ii) a Wherein parameters A, B, C and D are related to the self structure of the outdoor heat exchanger and can be determined by means of data fitting; ps is the suction pressure of the outdoor heat exchanger.
As a preferable aspect of the above-described defrosting control method according to the present invention, the step of obtaining an actual air volume q (t) of the outdoor unit of the air conditioner at a frosting time t since the last defrosting is completed includes: when t is 0, the actual air volume is the standard air volume Qstd(ii) a When t is greater than 0, the calculation formula of the actual air volume at the time t is as follows:
wherein the parameters a, b and c are related to the self structure of the outdoor heat exchanger and can be determined by means of data fitting, and the standard air quantity QstdThe normal air quantity of the outdoor heat exchanger is not influenced by frosting factors.
Finally, the invention also provides an air conditioner, which comprises a memory, a processor and an air conditioner defrosting control program which is stored on the memory and can run on the processor, wherein the air conditioner defrosting control program realizes the steps of the defrosting control method in any one of the technical schemes when being executed by the processor.
According to the defrosting control method of the outdoor unit of the air conditioner and the air conditioner, the actual frosting amount of the outdoor heat exchanger is calculated by comprehensively considering a plurality of factors including the actual air volume of the outdoor unit of the air conditioner, the actual moisture content of the air at the air inlet side, the actual moisture content of the air at the air outlet side and the surface temperature of the outdoor heat exchanger of the outdoor unit of the air conditioner, so that whether the outdoor unit of the air conditioner needs defrosting or not is determined. Therefore, the frosting amount of the outdoor unit of the air conditioner is calculated more accurately and meets the actual defrosting requirement, and the working performance and the user experience of the air conditioner are improved.
In addition, according to the defrosting control method of the outdoor unit of the air conditioner and the air conditioner, the condensation speed of the outdoor heat exchanger is calculated based on the actual air volume, the actual moisture content of the air at the air inlet side and the actual moisture content of the air at the air outlet side, and the frosting speed and the frosting amount of the outdoor heat exchanger are calculated by combining the frosting factor. Therefore, on the basis of comprehensively considering the influence factors of the frosting amount, the accurate calculation of the frosting amount is specifically realized, and the aims of improving the working performance of the air conditioner and improving the user experience are fulfilled.
Drawings
The defrosting control method of an outdoor unit of an air conditioner and the air conditioner according to the present invention will be described with reference to the accompanying drawings. In the drawings:
fig. 1 is a flowchart illustrating a defrosting control method of an outdoor unit of an air conditioner according to an embodiment of the present invention;
fig. 2 is a schematic diagram of measured data and a fitted curve of a relationship between an air volume of an outdoor unit of an air conditioner and a change in frosting amount according to the present embodiment.
Detailed Description
Preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only for explaining the technical principle of the present invention, and are not intended to limit the scope of the present invention. For example, although the present embodiment describes obtaining the surface temperature of the outdoor heat exchanger of the outdoor unit of the air conditioner by obtaining the temperature of the middle portion of the coil of the outdoor heat exchanger or the temperature of the liquid inlet pipe of the outdoor heat exchanger, the position of obtaining the surface temperature of the outdoor heat exchanger is not constant, and those skilled in the art can adjust the surface temperature as needed to suit the specific application without departing from the principles of the present invention.
In order to solve the above problems in the prior art, that is, to solve the problem that the outdoor unit of the air conditioner does not defrost when the outdoor unit needs defrosting or does not defrost when defrosting is not needed, which seriously affects the working performance and user experience of the air conditioner, the present embodiment provides a defrosting control method for the outdoor unit of the air conditioner and the air conditioner.
First, as shown in fig. 1, the present embodiment provides a defrost control method of an outdoor unit of an air conditioner, the defrost control method including:
s1, obtaining the actual air quantity Q (t) of the outdoor unit of the air conditioner at the frosting time t since the last defrosting is finished and the actual moisture content d of the air at the air inlet sideinAnd the actual moisture content d of the air at the air outlet sideoutAnd obtaining the surface temperature T of the outdoor heat exchanger of the outdoor unit of the air conditionerref。
Illustratively, the self structure and the working parameters of the outdoor unit of the air conditioner are determined when the outdoor unit of the air conditioner leaves a factory, the working capacity of a fan in the outdoor unit of the air conditioner is generally kept unchanged, and the air volume of the outdoor unit of the air conditioner is taken as the standard air volume Q when the air volume of the outdoor unit of the air conditioner is not influenced by frosting factors (or when the outdoor unit of the air conditioner is not frosted)std。
When the air conditioner heats the indoor in winter, the outdoor unit of the air conditioner is used as an evaporator to absorb the outdoor heat, and the indoor unit of the air conditioner is used as a condenser to release the heat to the indoor. At this time, water vapor in the outdoor air is condensed into water drops and then frosted when meeting cold on the outdoor heat exchanger of the outdoor unit of the air conditioner, so that the ventilation area between fins of the outdoor heat exchanger is reduced, and the actual air volume of the outdoor unit of the air conditioner is reduced. Meanwhile, the heat exchange efficiency between the refrigerant coil pipe inserted into the fins and the outside air is further hindered along with the increase of the frosting thickness of the outer surfaces of the fins, so that the heat exchange capacity between the outdoor heat exchanger and the outdoor air is reduced, and the heating capacity of the air conditioner is further influenced.
Therefore, the actual air volume of the outdoor unit of the air conditioner is greatly influenced by the frosting factor of the outdoor heat exchanger, and the actual frosting volume m of the outdoor heat exchanger in the frosting time t is combined with the defrosting control method provided by the embodimentice(t) and the standard air volume QstdThe calculation is performed.
Therefore, in the above stepsThe step of acquiring the actual air volume q (t) of the outdoor unit of the air conditioner at the frosting time t since the last defrosting in step S1 includes: when t is 0, the actual air quantity is the standard air quantity QstdThe air quantity can be determined through an air quantity experiment when the air conditioner product leaves a factory; when t is greater than 0, the calculation formula of the actual air volume at the time t is as follows:
wherein the parameters a, b and c are related to the self structure of the outdoor heat exchanger and can be determined by means of data fitting, and the standard air quantity QstdThe normal air quantity of the outdoor heat exchanger is not influenced by frosting factors. Wherein, the standard air quantity QstdHas the unit of (m)3(s), the unit of the actual air quantity Q (t) is (m)3S), actual frosting amount miceThe unit of (t) is (kg). Fig. 2 is a schematic view of measured data and a fitted curve obtained in a study on a relationship between an air volume of an outdoor unit of an air conditioner and a frost formation amount.
It can be understood that, in addition to the calculation of the actual air volume q (t) by the formula described above, the actual air volume of the outdoor unit of the air conditioner may be directly detected during the defrosting control of the outdoor unit of the air conditioner.
It can be understood that the actual moisture content d of the air on the intake sideinAnd the actual moisture content d of the air at the air outlet sideoutCan be detected directly by the sensor. In addition, as a preferred implementation manner of the above-mentioned defrosting control method provided in this embodiment, the actual moisture content d of the air at the air inlet side can be calculated by detecting the wet bulb temperature and the dry bulb temperature at the air inlet side and the wet bulb temperature and the dry bulb temperature at the air outlet side of the outdoor heat exchanger and by using a formulainAnd the actual moisture content d of the air at the air outlet sideout. Specifically, the actual moisture content d of the intake side airinThe calculation formula of (2) is as follows:
actual moisture content d of air at air outlet sideoutThe calculation formula of (2) is as follows:
wherein, cp，aThe specific heat capacity at constant pressure of dry air is 1.004 kJ/(kg. K) under 1 atmosphere of 20 ℃; c. Cp，vThe specific heat capacity of the steam at constant pressure is 1.865 kJ/(kg.K); t isw1The unit is: (DEG C) is the wet bulb temperature of air at the air inlet side, namely the wet bulb temperature of the external environment, and can be measured by a relative humidity sensor and also can be obtained by a cloud server; t isw2The wet bulb temperature of air at the air outlet side is (unit is:) and can be directly measured by a sensor, and a calculation formula of the wet bulb temperature is also given below in the embodiment; t isd1(unit is:. degree. C.) is the dry bulb temperature of the air at the air intake side, Td2The unit is:. degree.C. is the dry bulb temperature of the air at the air outlet side, and both can be obtained by direct monitoring; ds1The air at the air inlet side corresponds to the saturated moisture content under the temperature of the dry bulb, ds2The saturated moisture content of air at the air outlet side corresponding to the dry bulb temperature is shown, gamma is the latent heat of vaporization of water, and gamma is 2260 kJ/kg.
Wherein, the wet bulb temperature T of the air at the air outlet sidew2Can be directly monitored by a sensor, and can also be monitored by the suction pressure Ps of the outdoor heat exchanger and the dry bulb temperature T of the air at the air inlet sided1And the surface temperature T of the outdoor heat exchangerrefAnd is determined by the following formula:
Tw2＝A·Td1+B·Ps+C·Ps2+D·ln(Tref)。
wherein the parameters A, B, C and D are related to the self structure of the outdoor heat exchanger and can be determined by means of data fitting; and Ps is the suction pressure of the outdoor heat exchanger and can be directly monitored by a sensor.
As a preferred implementation of the above defrosting control method provided in this embodiment, the air on the air intake side corresponds to the temperature of the dry bulbLower saturated moisture content ds1And the air at the air outlet side corresponds to the saturated moisture content d at the dry bulb temperatures2It can also be calculated by the following formula:
wherein, Ps1The air inlet side corresponds to the saturation pressure under the dry bulb temperature which is determined by the dry bulb temperature T of the air at the air inlet sided1Determination of Ps1And Td1The relationship (c) can be determined by means of data fitting; ps2The saturation pressure at the air outlet side corresponding to the dry bulb temperature is determined by the dry bulb temperature T of the air at the air outlet sided2Determination of Ps2And Td2Can be determined by means of data fitting. The concrete expression is as follows:
wherein the saturation pressure calculating coefficient c1、c2、c3、c4、c5、c6、c7See table 1 below.
Table 1: coefficient of saturation pressure calculation
| C1 | C2 | C3 | C4 | C5 | C6 | C7 | |
| T＞0 | -5.675E+03 | 6.393E+00 | 9.678E-03 | 6.222E-07 | 2.074E-09 | -9.484E-13 | 4.164E+00 |
| T＜0 | -5.800E+03 | 1.391E+00 | -4.864E-02 | 4.176E-05 | -1.445E-08 | 6.546E+00 | - |
It is understood that in calculating Ps1In time, T in Table 1 is the dry bulb temperature T of the air at the air inlet sided1(ii) a In calculating Ps2In the meantime, T in Table 1 is the dry bulb temperature T of the air at the air outlet sided2。
S2, actual moisture content d of air on the air inlet side based on actual air quantity Q (t)inAnd the actual moisture content d of the air at the air outlet sideoutCalculating condensation speed m 'of outdoor heat exchanger'w(T) and based on the outdoor heat exchanger surface temperature TrefThe frosting factor f is determined.
Exemplarily, "actual moisture content d of air on the air inlet side based on actual air quantity Q (t)inAnd the actual moisture content d of the air at the air outlet sideoutCalculating condensation speed m 'of outdoor heat exchanger'w(t) "the calculation formula used is:
wherein, cp，aThe specific heat capacity at constant pressure of dry air is 1.004 kJ/(kg. K) under 1 atmosphere of 20 ℃; rhoAir conditionerAs the density of air, the density of air was about 1.29Kg/m under standard conditions (0 ℃, 1atm)3。
Based on the surface temperature T of the outdoor heat exchangerrefThe step of determining the frosting factor f "comprises: when T isrefWhen f is greater than 0, f is 0; and, when T isrefWhen < 0, f is 1. It should be noted that the temperature T of the coil can be monitored generallydefTo indirectly represent the surface temperature of the outdoor heat exchanger, or through TdefRepresenting T in combination with correction parametersrefAnd determining the correction parameters related to the actual coil temperature monitoring point position.
S3, m 'based on condensation speed'w(t) calculating the frosting speed m of the outdoor heat exchanger by using the frosting factor fice(t); wherein, the formula is as follows:
m′ice(t)＝f·m′w(t)。
that is, the dew condensation rate m 'at time t'wThe product of (t) and the frosting factor f represents the frosting speed m at that momentice(t)。
S4, m 'based on frosting speed'ice(t) calculating the actual frosting amount m of the outdoor heat exchanger at the frosting time tice(t); wherein, the formula is as follows:
that is, the actual frosting amount m is represented by a constant integral of the frosting rate in each period of the frosting time t since the last defrosting of the outdoor unit of the air conditioner is completedice(t)。
S5, based on the actual frosting amount mice(t) and a preset frosting amount threshold value mmaxAnd determining whether the outdoor unit of the air conditioner needs to be defrosted.
Illustratively, a frosting amount threshold value m is presetmaxThe calculation formula of (2) is as follows:
mmax＝N·δ·FW·W·ρwater (W)；
Wherein N is the number of fins of the outdoor heat exchanger, delta is the distance between adjacent fins of the outdoor heat exchanger, and FWFor the width of each fin in the distribution direction of the plurality of fins, W is the width of the outdoor heat exchanger in the distribution direction of the plurality of fins, rhoWater (W)Is the density of water.
When determining whether the outdoor unit of the air conditioner needs to be defrosted, the air conditioner can be required to simultaneously meet the following two conditions or defrost only by meeting one of the conditions:
condition 1: actual frosting amount mice(t) and a preset frosting amount threshold value mmaxThe ratio of (A) is greater than a preset critical frosting ratio F; the preset critical frosting ratio F is preset according to specific conditions, and is recommended to be selected from 1/3-1/2.
Condition 2: actual frosting amount mice(t) and a preset frosting amount threshold value mmaxIs less than a predetermined critical frosting difference.
It can be understood that, according to the defrosting control method of the outdoor unit of the air conditioner in the embodiment, the actual frosting amount of the outdoor heat exchanger is calculated by comprehensively considering a plurality of factors including the actual air volume of the outdoor unit of the air conditioner, the actual moisture content of the air at the air inlet side, the actual moisture content of the air at the air outlet side and the surface temperature of the outdoor heat exchanger of the outdoor unit of the air conditioner, so as to determine whether the outdoor unit of the air conditioner needs defrosting. Therefore, the frosting amount of the outdoor unit of the air conditioner is calculated more accurately and meets the actual defrosting requirement, and the working performance and the user experience of the air conditioner are improved.
In addition, according to the defrosting control method of the outdoor unit of the air conditioner, the condensation speed of the outdoor heat exchanger is calculated based on the actual air volume, the actual moisture content of the air at the air inlet side and the actual moisture content of the air at the air outlet side, and the frosting speed and the frosting amount of the outdoor heat exchanger are calculated by combining the frosting factor. Therefore, on the basis of comprehensively considering the influence factors of the frosting amount, the accurate calculation of the frosting amount is specifically realized, and the aims of improving the working performance of the air conditioner and improving the user experience are fulfilled.
Meanwhile, the defrosting control method of the outdoor unit of the air conditioner in the embodiment further has the following advantages:
(1) the temperature and air pressure sensors commonly arranged on the outdoor unit of the air conditioner at present and the wet bulb temperature on the cloud service are directly adopted as input data, so that the cost of the air conditioner is not additionally increased.
(2) Through selection and calculation of appropriate parameters and a fitting formula, the change of the frosting amount of the outdoor unit of the air conditioner can be accurately predicted, and a basis is provided for judging whether defrosting is needed or not;
(3) the defrosting quantity of the outdoor unit of the air conditioner is used as a basis for judging whether the air conditioner enters a defrosting mode or not, stability and reliability are achieved, the heating quantity output of the air conditioner can be guaranteed to the maximum extent, and the problem that frost is not removed or false defrosting of the outdoor unit is caused by single factors can be avoided.
Of course, the above alternative embodiments, and the alternative embodiments and the preferred embodiments can also be used in a cross-matching manner, so that a new embodiment is combined to be suitable for a more specific application scenario.
It should be noted that although the detailed steps of the method of the present invention have been described in detail, those skilled in the art can combine, separate and combine the steps without departing from the basic principle of the present inventionThe technical scheme after the change of the order does not change the basic idea of the invention, and therefore, the technical scheme also falls into the protection scope of the invention. For example, in step S1, the actual air volume q (t) and the actual intake air moisture content d at the frost formation time t of the outdoor unit of the air conditioner are obtained from the previous defrosting completioninAnd the actual moisture content d of the air at the air outlet sideoutAnd obtaining the surface temperature T of the outdoor heat exchanger of the outdoor unit of the air conditionerrefThen (c) is performed. The parameters can be acquired simultaneously or sequentially. In step S2, the condensation speed m 'of the outdoor heat exchanger may be calculated'wAfter (T), obtaining the surface temperature T of the outdoor heat exchangerrefAnd based on the surface temperature T of the outdoor heat exchangerrefThe frosting factor f is determined.
It should be understood by those skilled in the art that the defrosting control method of the outdoor unit of the air conditioner provided in the present embodiment may be stored as a program in a computer-readable storage medium. The storage medium includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) or a processor (processor) to perform some steps of the methods according to the embodiments of the present invention. And the aforementioned storage medium includes: various media capable of storing program codes, such as a usb disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk.
Finally, the present embodiment further provides an air conditioner, which includes a memory, a processor, and an air conditioner defrosting control program stored in the memory and capable of running on the processor, wherein the air conditioner defrosting control program, when executed by the processor, implements the steps of the defrosting control method according to any of the above embodiments. It can be understood that, since the air conditioner provided in this embodiment includes any one of the above-described defrosting control methods of the outdoor unit of the air conditioner, the advantages of the above-described defrosting control method of the outdoor unit of the air conditioner are necessarily obtained, and thus, the detailed description thereof is omitted.
Furthermore, those skilled in the art will appreciate that while some embodiments described herein include some features included in other embodiments, rather than other features, combinations of features of different embodiments are meant to be within the scope of the invention and form different embodiments. For example, in the claims of the present invention, any of the claimed embodiments may be used in any combination.
So far, the technical solutions of the present invention have been described in connection with the preferred embodiments shown in the drawings, but it is easily understood by those skilled in the art that the scope of the present invention is obviously not limited to these specific embodiments. Equivalent changes or substitutions of related technical features can be made by those skilled in the art without departing from the principle of the invention, and the technical scheme after the changes or substitutions can fall into the protection scope of the invention.
Claims (10)
1. A defrost control method of an outdoor unit of an air conditioner, the defrost control method comprising:
obtaining the actual air quantity Q (t) of the outdoor unit of the air conditioner at the frosting time t since the last defrosting is finished and the actual moisture content d of the air at the air inlet sideinAnd the actual moisture content d of the air at the air outlet sideoutAnd obtaining the surface temperature T of the outdoor heat exchanger of the outdoor unit of the air conditionerref；
Based on the actual air quantity Q (t), the actual moisture content d of the air at the air inlet sideinAnd the actual moisture content d of the air on the air outlet sideoutCalculating the condensation speed m 'of the outdoor heat exchanger'w(T) and based on the outdoor heat exchanger surface temperature TrefDetermining a frosting factor f;
m 'based on the condensation speed'w(t) and the frosting factor f calculating the frosting speed m 'of the outdoor heat exchanger'ice(t)；
M 'based on the frosting speed'ice(t) calculating an actual frosting amount m of the outdoor heat exchanger at the frosting time tice(t)；
Based on the actual frosting amount mice(t) and Preset frostingMagnitude threshold mmaxAnd determining whether the outdoor unit of the air conditioner needs defrosting.
2. Defrost control method according to claim 1, characterized in that "based on the actual frost amount mice(t) and a preset frosting amount threshold value mmaxThe step of determining whether the outdoor unit of the air conditioner needs to be defrosted includes:
if the actual frosting amount mice(t) and the preset frosting amount threshold mmaxIs greater than a predetermined critical frosting ratio F and/or if said actual frosting amount mice(t) and the preset frosting amount threshold mmaxAnd if the difference value is smaller than the preset critical frosting difference value, determining that the outdoor unit of the air conditioner needs to be defrosted.
3. Defrost control method according to claim 1, characterized in that the preset frosting amount threshold mmaxThe calculation formula of (2) is as follows:
mmax＝N·δ·FW·W·ρwater (W)；
Wherein N is the number of fins of the outdoor heat exchanger, δ is the distance between adjacent fins of the outdoor heat exchanger, and FWFor the width of each fin along the distribution direction of the plurality of fins, W is the width of the outdoor heat exchanger along the distribution direction of the plurality of fins, pWater (W)Is the density of water.
4. The defrosting control method according to claim 1, wherein "based on the frosting speed m'ice(t) calculating an actual frosting amount m of the outdoor heat exchanger at the frosting time tice(t) "the calculation formula used is:
5. defrost control according to claim 1The preparation method is characterized in that the preparation method is based on the condensation speed m'w(t) and the frosting factor f calculating the frosting speed m 'of the outdoor heat exchanger'ice(t) "the calculation formula used is:
m′ice(t)＝f·m′w(t)。
6. the defrosting control method according to claim 1, wherein "the actual moisture content d of the intake side air based on the actual air volume q (t)inAnd the actual moisture content d of the air on the air outlet sideoutCalculating the condensation speed m 'of the outdoor heat exchanger'w(t) "the calculation formula used is:
wherein, cp，aIs dry air with constant pressure specific heat capacity, rhoAir conditionerIs the density of air; and/or the like and/or,
based on the surface temperature T of the outdoor heat exchangerrefThe step of determining the frosting factor f "comprises:
when T isrefWhen f is greater than 0, f is 0; and, when T isrefWhen < 0, f is 1.
7. The defrost control method of claim 1,
actual moisture content d of air on the intake sideinThe calculation formula of (2) is as follows:
actual moisture content d of air at air outlet sideoutThe calculation formula of (2) is as follows:
wherein, cp，aA constant pressure specific heat capacity for dry air, cp，vIs the specific heat capacity of water vapor at constant pressure, Tw1Is the wet bulb temperature, T, of the air at the air inlet sidew2The wet bulb temperature, T, of the air at the air outlet sided1Is the dry bulb temperature, T, of the air at the air inlet sided2Dry bulb temperature of air at the air outlet side, ds1The air at the air inlet side corresponds to the saturated moisture content under the temperature of the dry bulb, ds2The saturated moisture content of the air at the air outlet side is corresponding to the temperature of the dry bulb, and gamma is the latent heat of vaporization of water.
8. Defrost control method according to claim 7, characterized in that the wet bulb temperature T of the air out side airw2Determined by the following formula:
Tw2＝A·Td1+B·Ps+C·Ps2+D·ln(Tref)；
wherein parameters A, B, C and D are related to the self structure of the outdoor heat exchanger and can be determined by means of data fitting; ps is the suction pressure of the outdoor heat exchanger.
9. The defrost control method according to claim 1, wherein the step of obtaining an actual air volume q (t) of the outdoor unit at a frost formation time t since a last defrost completion comprises:
when t is 0, the actual air volume is the standard air volume Qstd；
When t is greater than 0, the calculation formula of the actual air volume at the time t is as follows:
wherein the parameters a, b and c are related to the self structure of the outdoor heat exchanger and can be determined by means of data fitting, and the standard air quantity QstdThe normal air quantity of the outdoor heat exchanger is not influenced by frosting factors.
10. An air conditioner comprising a memory, a processor, and an air conditioner defrost control program stored on the memory and executable on the processor, the air conditioner defrost control program when executed by the processor implementing the steps of the defrost control method of any of claims 1-9.
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| CN202011038497.8A CN112303815A (en) | 2020-09-27 | 2020-09-27 | Defrosting control method of air conditioner outdoor unit and air conditioner |
| PCT/CN2021/105392 WO2022062576A1 (en) | 2020-09-27 | 2021-07-09 | Defrosting control method for outdoor unit of air conditioner, and air conditioner |
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| CN113847708A (en) * | 2021-08-31 | 2021-12-28 | 青岛海尔空调电子有限公司 | Defrosting control method of air conditioner outdoor unit and air conditioner |
| WO2022062576A1 (en) * | 2020-09-27 | 2022-03-31 | 青岛海尔空调电子有限公司 | Defrosting control method for outdoor unit of air conditioner, and air conditioner |
| CN114279047A (en) * | 2022-01-06 | 2022-04-05 | 珠海格力电器股份有限公司 | Defrosting control method and air conditioner |
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| CN116697875B (en) * | 2023-08-07 | 2023-10-13 | 湖南大学 | Heat pump frost monitoring system based on electrical characteristics and defrosting method thereof |
| CN117407634B (en) * | 2023-10-18 | 2024-05-03 | 中国空气动力研究与发展中心计算空气动力研究所 | Flat plate frosting thickness rapid prediction method based on frosting characteristic curve |
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