CN113883661B - Defrosting control method for multi-split air conditioning system - Google Patents
Defrosting control method for multi-split air conditioning system Download PDFInfo
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- CN113883661B CN113883661B CN202010636223.2A CN202010636223A CN113883661B CN 113883661 B CN113883661 B CN 113883661B CN 202010636223 A CN202010636223 A CN 202010636223A CN 113883661 B CN113883661 B CN 113883661B
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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
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
- F24F11/41—Defrosting; Preventing freezing
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/64—Electronic processing using pre-stored data
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/65—Electronic processing for selecting an operating mode
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/88—Electrical aspects, e.g. circuits
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2110/00—Control inputs relating to air properties
- F24F2110/10—Temperature
- F24F2110/12—Temperature of the outside air
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2140/00—Control inputs relating to system states
- F24F2140/20—Heat-exchange fluid temperature
Abstract
The invention relates to the technical field of air conditioners, and particularly provides a defrosting control method for a multi-split air conditioner system, aiming at solving the problem that false defrosting or defrosting delay occurs because the conventional multi-split air conditioner system cannot accurately judge the time for executing a defrosting mode. To this end, the multi-split air conditioning system of the present invention includes a compressor, an outdoor unit, and a plurality of indoor units, and the defrosting control method includes the steps of: acquiring outdoor environment temperature under the condition that the multi-split air-conditioning system operates in a heating mode; acquiring the temperature of an external coil of an outdoor unit; calculating the total heating increment of the multi-split air conditioning system; according to the outdoor environment temperature, the temperature of the external coil and the total heating increment, whether the multi-split air-conditioning system enters the defrosting mode or not is judged, and the frosting degree of the outdoor unit can be more accurately judged, so that the time for executing the defrosting mode is more accurately determined, the phenomenon of false defrosting or defrosting lag is effectively avoided, and the use experience of a user is improved.
Description
Technical Field
The invention relates to the technical field of air conditioners, and particularly provides a defrosting control method for a multi-split air conditioner system.
Background
The multi-split air conditioning system is convenient to install and maintain, easy to realize centralized control and management, and widely applied to large-scale building places such as hospitals, large-scale shopping malls, office buildings, hotels and the like. Under the condition that the multi-split air-conditioning system is in heating operation, the outer coil of the outdoor unit is easy to frost, and the frosting of the outer coil can cause the overall performance of the multi-split air-conditioning system to be reduced, so that the heating effect of the multi-split air-conditioning system is influenced, the comfort of an indoor environment is reduced, and the user experience is influenced. Therefore, under the condition that the multi-split air-conditioning system is in the heating working condition, the external coil of the multi-split air-conditioning system needs to be timely and effectively defrosted.
In order to solve the above problems, in the prior art, whether the multi-split air conditioning system enters the defrosting mode is judged according to the outdoor environment temperature and the temperature of the external coil. However, the above determination method is relatively simple, it is difficult to accurately determine the defrosting time, and it is very easy for a false determination to occur, for example, a false defrosting phenomenon occurs when the multi-split air-conditioning system is not frosted or frosted less, or a defrosting delay phenomenon occurs when the multi-split air-conditioning system is frosted more, and both the false defrosting and the defrosting delay affect the heating effect of the multi-split air-conditioning system, and further affect the user experience. In view of this, it is important to select an appropriate defrosting timing.
Therefore, there is a need in the art for a new defrost control method for a multi-split air conditioning system to solve the above problems.
Disclosure of Invention
In order to solve the above-mentioned problems in the prior art, that is, to solve the problem that false defrosting or defrosting delay occurs due to the fact that the existing multi-split air conditioning system cannot accurately determine the time for executing the defrosting mode, the present invention provides a defrosting control method for a multi-split air conditioning system, wherein the multi-split air conditioning system comprises a compressor, an outdoor unit and a plurality of indoor units, and the defrosting control method comprises the following steps:
acquiring outdoor environment temperature under the condition that the multi-split air-conditioning system operates in a heating mode;
acquiring the temperature of an external coil of the outdoor unit;
calculating the total heating increment of the multi-split air conditioning system;
and judging whether the multi-split air-conditioning system enters a defrosting mode or not according to the outdoor environment temperature, the temperature of the outer coil and the total heating increment.
In a preferred embodiment of the above defrosting control method, the step of "calculating a total heating increment of the multi-split air conditioning system" specifically includes:
calculating the average heating increment of all indoor units in the running state;
calculating the increment of the outdoor unit heating capacity of the outdoor unit;
calculating the total heating increment according to the average heating increment and the outer unit heating capacity increment.
In a preferred embodiment of the above-described defrosting control method, the step of "calculating an average heating increase of all indoor units in an operating state" includes:
respectively calculating the internal heating increment of each indoor unit in the running state;
and calculating the average value of all the inner heating increments, and taking the average value as the average heating increment.
In a preferred embodiment of the above defrosting control method, the indoor heating increment of any one of the indoor units is calculated by the following method:
respectively acquiring a first saturation temperature corresponding to a first exhaust pressure and a second saturation temperature corresponding to a second exhaust pressure of the compressor according to a preset time interval;
respectively acquiring the temperature of a first inner coil and the temperature of a second inner coil of the indoor unit according to the preset time interval;
respectively acquiring a first indoor environment temperature and a second indoor environment temperature according to the preset time interval;
acquiring the number of the indoor units;
and calculating the inner heating increment according to the first saturation temperature, the second saturation temperature, the first inner coil temperature, the second inner coil temperature, the first indoor environment temperature, the second indoor environment temperature and the matching number of the indoor unit.
In a preferred embodiment of the above-described defrosting control method, the step of "calculating the indoor unit heating increment based on the first saturation temperature, the second saturation temperature, the first inner coil temperature, the second inner coil temperature, the first indoor ambient temperature, the second indoor ambient temperature, and the number of indoor units" specifically includes:
the internal heating gain is calculated according to the following formula:
IUHeatQ＝{(Pd_temp 2 -Tc 2 )-(Pd_temp 1 -Tc 1 )+(Tai 2 -Tai 1 )}×HP×QFixRate
wherein IUHeatQ is the internal heating increment; pd _ temp 1 Is the first saturation temperature; pd _ temp 2 Is the second saturation temperature; tc 1 Is the first inner coil temperature; tc 2 Is the second inner coil temperature; tai 1 Is the first indoor ambient temperature; tai (Tai) 2 Is the second indoor ambient temperature; HP is the number of the indoor units; QFixRate is the temperature correction coefficient of the indoor environment temperature;
wherein the temperature correction coefficient QFixRate is determined by the outdoor ambient temperature Tao and/or the indoor ambient temperature Tai.
In a preferred embodiment of the above-described defrosting control method, the step of "calculating an average value of all the internal heating increments, and taking the average value as the average heating increment" specifically includes:
the average heating increment is calculated according to the following formula:
IUAVGHeatQ＝∑IUHeatQ/∑HP
wherein IUAVGHeatQ is the average heating increment; IUHeatQ is the internal heating increment; and HP is the number of the indoor units.
In a preferred technical solution of the above-mentioned defrosting control method, "calculating an outdoor unit heating capacity increment of the outdoor unit" specifically includes:
respectively acquiring a third saturation temperature corresponding to a third exhaust pressure and a fourth saturation temperature corresponding to a fourth exhaust pressure of the compressor according to a preset time interval;
and calculating the heating capacity increment of the outer machine according to the third saturation temperature and the fourth saturation temperature.
In a preferred embodiment of the above-described defrosting control method, the step of "calculating the outdoor unit heating capacity increase based on the third saturation temperature and the fourth saturation temperature" includes:
calculating the increment of the outdoor unit heating capacity according to the following formula:
OUHeatQ＝(Pd_temp 4 -Pd_temp 3 )×INVfix
wherein OUHeatQ is the heating capacity increment of the outdoor unit; pd _ temp 3 Is the third saturation temperature; pd _ temp 4 Is the fourth saturation temperature; the INVfix is a frequency correction coefficient of the compressor;
wherein the frequency correction factor INVfix is determined by the frequency of the compressor.
In a preferred embodiment of the above defrosting control method, the step of "calculating the total heating increase according to the average heating increase and the outdoor unit heating capacity increase" includes:
the total heating gain is calculated according to the following formula:
SysHeatQ＝(IUAVGHeatQ-Q 1 )×K 1 +(OUHeatQ-Q 2 )×K 2
wherein SysHeatQ is the total heating gain; iuavfeedq is the average heating increment; OUHeatQ is the heating capacity increment of the outdoor unit; q 1 Is a first preset heating increment threshold value; q 2 A second preset heating increment threshold value;K 1 correcting the coefficient for the first heating increment; k 2 Correcting the coefficient for the second heating increment;
wherein the first heating increment correction coefficient K 1 And/or the second heating increment correction coefficient K 2 Determined by the frequency of the compressor.
In a preferred technical solution of the above defrosting control method, the step of determining whether to put the multi-split air conditioning system into a defrosting mode according to the outdoor ambient temperature, the temperature of the external coil, and the total heating increment includes:
judging whether the multi-split air-conditioning system simultaneously satisfies the following conditions:
the outdoor environment temperature is less than a first preset temperature threshold;
the temperature of the outer coil is less than a second preset temperature threshold;
the total heating increment is smaller than a third preset heating increment threshold value;
and under the condition that the multi-split air-conditioning system simultaneously meets the three conditions, enabling the multi-split air-conditioning system to enter a defrosting mode.
As can be understood by those skilled in the art, in a preferred embodiment of the defrosting control method of the present invention, the outdoor ambient temperature is obtained in a case where the multi-split air conditioning system operates in a heating mode; acquiring the temperature of an external coil of an outdoor unit; calculating the total heating increment of the multi-split air conditioning system; and judging whether the multi-split air-conditioning system enters a defrosting mode or not according to the outdoor environment temperature, the temperature of the outer coil and the total heating increment. Compared with the technical scheme that whether the multi-split air-conditioning system is enabled to enter the defrosting mode is judged only according to the outdoor environment temperature and the outer coil temperature in the prior art, the defrosting control method provided by the invention judges whether the multi-split air-conditioning system is enabled to enter the defrosting mode according to the outdoor environment temperature, the outer coil temperature and the total heating increment. On the basis of the two parameters, the frosting degree of the outdoor unit at the current outdoor environment temperature and the current temperature of the external coil can be directly, accurately and effectively judged by calculating the heating increment during the multi-split operation through introducing the parameter of the total heating increment. Therefore, the outdoor environment temperature, the temperature of the external coil and the total heating increment are simultaneously brought into the defrosting judgment condition, and the frosting degree of the outdoor unit can be more accurately judged, so that the time for executing the defrosting mode is more accurately determined, the phenomenon of false defrosting or defrosting delay is effectively avoided, and the use experience of a user is improved.
Furthermore, the defrosting control method calculates the total heating increment according to the average heating increment of all the indoor units in the running state and the outdoor unit heating capacity increment of the outdoor unit, and in the calculation process, not only the influence of all the indoor units in the running state on the total heating increment is considered, but also the influence of the outdoor unit on the total heating increment is considered, so that the total heating increment of the multi-split air-conditioning system can be more accurately determined, whether the heating effect of the multi-split air-conditioning system is seriously influenced or not can be accurately judged, the time for executing the defrosting mode can be more accurately determined, and the phenomenon of false defrosting or defrosting delay is effectively avoided.
Drawings
The multi-split air conditioning system and the defrosting control method of the present invention will be described with reference to the accompanying drawings. In the drawings:
fig. 1 is a structural view of a multi-split air conditioning system of the present invention;
FIG. 2 is a main flow chart of the defrost control method of the present invention;
FIG. 3 is a complete flow chart of the defrost control method of the present invention;
fig. 4 is a flowchart of a method of calculating a total heating increment of a multi-split air conditioning system according to the present invention;
fig. 5 is a flowchart of a method of calculating an average heating increase of all indoor units in an operation state according to the present invention;
fig. 6 is a flowchart of a method of calculating an inner heating increment of any one of the indoor units according to the present invention;
fig. 7 is a flowchart of a method of calculating an outdoor unit heating capacity increase of an outdoor unit according to the present invention;
fig. 8 is a logic diagram of the defrost control method of the present invention.
List of reference numerals
1. An outdoor unit; 11. an outdoor temperature sensor; 12. an outer coil temperature sensor;
2. an indoor unit; 21. an indoor temperature sensor; 22. inner coil temperature sensor.
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 defrost control method is described in conjunction with a multi-split air conditioning system, this is not intended to limit the scope of the present application, and those skilled in the art may also apply the defrost control method of the present application to an air conditioning system including only one indoor unit without departing from the principles of the present application.
It should be noted that the terms "first", "second" and "third" in the description of the present invention are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
Based on the technical problems in the background art, the invention provides a defrosting control method for a multi-split air-conditioning system, and aims to judge whether the multi-split air-conditioning system enters a defrosting mode according to outdoor environment temperature, outer coil temperature and total heating increment. On the basis of the two parameters, the frosting degree of the outdoor unit at the current outdoor environment temperature and the current temperature of the external coil can be directly, accurately and effectively judged by calculating the heating increment during the multi-split operation through introducing the parameter of the total heating increment. Therefore, the outdoor environment temperature, the temperature of the external coil and the total heating increment are simultaneously brought into the defrosting judgment condition, and the frosting degree of the outdoor unit can be more accurately judged, so that the time for executing the defrosting mode is more accurately determined, the phenomenon of false defrosting or defrosting delay is effectively avoided, and the use experience of a user is improved.
Referring first to fig. 1, a multi-split air conditioning system of the present invention will be described. Fig. 1 is a structural view of a multi-split air conditioning system according to the present invention.
As shown in fig. 1, the multi-split air conditioning system of the present invention includes an outdoor unit 1 and three indoor units 2, a compressor (not shown in the figure), an outdoor heat exchanger (not shown in the figure) and an outdoor fan (not shown in the figure) are disposed in a casing of the outdoor unit 1, each of the indoor units is provided with an indoor heat exchanger and an indoor fan, the outdoor unit 1 is provided with an outdoor temperature sensor 11 for detecting an outdoor ambient temperature and an outdoor coil temperature sensor 12 for detecting an outdoor coil temperature of the outdoor heat exchanger, the indoor units 2 are provided with an indoor temperature sensor 21 for detecting an indoor ambient temperature and an indoor coil temperature sensor 22 for detecting an indoor coil temperature of the indoor heat exchanger, and an exhaust pressure sensor (not shown in the figure) for detecting an exhaust pressure of the compressor is disposed on an exhaust pipe of the compressor. The arrangement of the above components is common knowledge in the art, and will not be described herein.
The multi-split air-conditioning system includes other modes such as a heating mode, a cooling mode, a self-cleaning mode, a sleep mode or a silent mode, and during the operation of the multi-split air-conditioning system, no matter whether the multi-split air-conditioning system operates in any of the above listed modes, one, two or three indoor units 2 may be in an operating state.
The number of the indoor units 2 is not limited to three, and those skilled in the art can flexibly adjust and set the number of the indoor units 2 according to actual use requirements, for example, two, four, five or any number, and all the rooms may be connected in parallel by adjusting the number of the indoor units 2 in any way, and the number of any two indoor units 2 may be the same or different.
A defrosting control method for a multi-split air conditioning system according to the present invention will be described with reference to fig. 2 and 3. Wherein, FIG. 2 is a main flow chart of the defrost control method of the present invention; fig. 3 is a complete flow chart of the defrost control method of the present invention.
As shown in fig. 2, the defrosting control method for the multi-split air conditioning system of the present invention includes the steps of:
s100, under the condition that the multi-split air-conditioning system operates in a heating mode, acquiring the outdoor environment temperature;
s200, acquiring the temperature of an external coil of the outdoor unit;
s300, calculating the total heating increment of the multi-split air conditioning system;
and S400, judging whether the multi-split air-conditioning system enters a defrosting mode or not according to the outdoor environment temperature, the temperature of the outer coil and the total heating increment.
The outdoor unit is usually disposed in an outdoor environment, and the outdoor environment temperature is an environment temperature of an outdoor position where the outdoor unit is disposed.
The total heating increment is a variation of the heating capacity of the multi-split air conditioning system in a preset time interval, and the variation can be determined according to the frosting condition of the outdoor unit, and can be positive, negative or zero. The preset time interval may be 3min, 5min, 7min, or the like, which is only an exemplary but not limiting example, and those skilled in the art may flexibly adjust and set the preset time interval according to a heating effect of the multi-split air-conditioning system in practical application, and no matter how the preset time interval is adjusted and set, only that whether the heating amount of the multi-split air-conditioning system is changed and the change amount in the preset time interval can be accurately determined.
In steps S100 and S200, the outdoor environment temperature may be detected by an outdoor temperature sensor provided in the outdoor unit, and the outside coil temperature may be detected by an outside coil temperature sensor of the outdoor heat exchanger. Of course, the detection means of the outdoor environment temperature and the temperature of the external coil are not limited to the above examples, and may be obtained by any other means, so long as the outdoor environment temperature and the temperature of the external coil can be detected.
In the above process, the execution sequence of steps S100 to S300 is not limited to the above-mentioned sequence, and step S200 may be executed first, and then step S100 and step S300 may be executed, or step S100 to step S300 may be executed at the same time, which is not limited in this respect.
A method for calculating the total heating increase of the multi-split air conditioning system according to the present invention will be described with reference to fig. 4 to 7. Fig. 4 is a flowchart illustrating a method of calculating a total heating increment of a multi-split air conditioning system according to the present invention; fig. 5 is a flowchart of a method of calculating an average heating increase of all indoor units in an operation state according to the present invention; fig. 6 is a flowchart of a method of calculating an inner heating increment of any one of the indoor units according to the present invention; fig. 7 is a flowchart of a method of calculating an outdoor unit heating capacity increase of an outdoor unit according to the present invention.
As shown in fig. 4, the step of "calculating a total heating increment of the multi-split air conditioning system" in step S300 specifically includes:
s311, calculating the average heating increment of all indoor units in the running state;
s312, calculating the heating capacity increment of an outdoor unit of the outdoor unit;
and S313, calculating the total heating increment according to the average heating increment and the external unit heating capacity increment.
The average heating increment is the average variation of the heating quantity of all the indoor units in the running state in a preset time interval; the outdoor unit heating capacity increment is the variation of the outdoor unit heating capacity in a preset time interval.
In the above process, the execution sequence of step S311 and step S312 is not limited to the above listed sequence, step S312 may be executed first and then step S311 may be executed, or step S311 and step S312 may be executed simultaneously, which is not limited in this respect.
Preferably, as shown in fig. 5, the step of "calculating an average heating increase of all indoor units in the operating state" in step S311 specifically includes:
s321, respectively calculating the internal heating increment of each indoor unit in the running state;
and S322, calculating the average value of all internal heating increments, and taking the average value as the average heating increment.
As shown in fig. 6, the internal heating increment of any one of the indoor units in the operating state may be calculated according to the following method:
s331, respectively obtaining a first saturation temperature corresponding to a first exhaust pressure and a second saturation temperature corresponding to a second exhaust pressure of the compressor according to a preset time interval;
s332, respectively acquiring the temperature of a first inner coil and the temperature of a second inner coil of the indoor unit according to a preset time interval;
s333, respectively acquiring a first indoor environment temperature and a second indoor environment temperature according to a preset time interval;
s334, acquiring the number of the indoor units;
and S335, calculating the indoor heating increment according to the first saturation temperature, the second saturation temperature, the first inner coil temperature, the second inner coil temperature, the first indoor environment temperature, the second indoor environment temperature and the matching number of the indoor unit.
Since the indoor unit is usually placed in an indoor environment, the indoor environment temperature is the ambient temperature of the indoor position where the indoor unit is placed.
The preset time intervals in steps S331 to S333 are the same, for example, the saturation temperature, the temperature of the inner coil, and the indoor environment temperature are detected once every 5min, during the detection, the saturation temperature, the temperature of the inner coil, the indoor environment temperature, and the number of pieces of the indoor unit may be detected and obtained according to the above listed sequence, or the number of pieces of the indoor unit may be obtained, and then the saturation temperature, the temperature of the inner coil, and the indoor environment temperature are detected, or the saturation temperature, the temperature of the inner coil, and the indoor environment temperature may be detected while obtaining the number of pieces of the indoor unit.
In step S331, a first exhaust pressure and a second exhaust pressure may be detected by an exhaust pressure sensor disposed on an exhaust pipe of the compressor, and a first saturation temperature corresponding to the first exhaust pressure and a second saturation temperature corresponding to the second exhaust pressure are determined by using a table lookup manner based on a comparison table of a relationship between the exhaust pressure stored in the multi-split air conditioning system and a saturation temperature corresponding thereto; of course, the first saturation temperature corresponding to the first exhaust pressure and the second saturation temperature corresponding to the second exhaust pressure may be calculated by using other relational expressions between the exhaust pressure and the saturation temperature corresponding thereto.
In steps S332 and S333, the first inner coil temperature and the second inner coil temperature may be detected by an inner coil temperature sensor of the indoor heat exchanger, and the first indoor ambient temperature and the second indoor ambient temperature may be detected by an indoor temperature sensor provided in the indoor unit.
Of course, the means for detecting the exhaust pressure, the saturation temperature corresponding to the exhaust pressure, the temperature of the inner coil, and the indoor ambient temperature is not limited to the above examples, and may be obtained by any other means as long as the exhaust pressure, the temperature of the inner coil, and the indoor ambient temperature can be detected.
Further, in step S335, the internal heating increment may be calculated according to the following equation (1):
IUHeatQ＝{(Pd_temp 2 -Tc 2 )-(Pd_temp 1 -Tc 1 )+(Tai 2 -Tai 1 )}×HP×QFixRate (1)
in the formula (1), IUHeatQ is the inner heating increment; pd _ temp 1 Is a first saturation temperature; pd _ temp 2 Is the second saturation temperature; tc 1 A first inner coil temperature; tc 2 A second inner coil temperature; tai 1 Is a first indoor ambient temperature; tai (Tai) 2 Is a second chamberThe internal ambient temperature; HP is the number of indoor units; QFixRate is the temperature correction coefficient for the indoor ambient temperature.
The temperature correction coefficient is determined by the outdoor ambient temperature and the indoor ambient temperature, and in general, when the outdoor ambient temperature is lower and the indoor ambient temperature is higher, the more heat is required for each increase of 1 ℃ in the indoor ambient temperature, and the larger the temperature correction coefficient is, as shown in table 1.
TABLE 1 QFIxRate vs. Tao and Tai
It should be noted that the above listed correspondence relationship among the temperature correction coefficient, the outdoor environment temperature and the indoor environment temperature and the temperature correction coefficient, and the outdoor environment temperature and the indoor environment temperature is only exemplary and not restrictive, and those skilled in the art can flexibly adjust and set the correspondence relationship among the temperature correction coefficient and the temperature correction coefficient, and the outdoor environment temperature and the indoor environment temperature according to the hardware parameters of the air conditioning system, the outdoor environment temperature and the indoor environment temperature in practical application. Furthermore, it will be appreciated by those skilled in the art that the temperature correction coefficient may also be determined by only the outdoor ambient temperature or the indoor ambient temperature.
In the formula (1), the internal heating increment is determined by combining a plurality of parameters such as the first saturation temperature, the second saturation temperature, the first internal coil temperature, the second internal coil temperature, the first indoor environment temperature, the second indoor environment temperature, the matching number of the indoor unit and the like, so that the parameters are brought into the defrosting determination condition, and under the combined action of the parameters, the outdoor environment temperature and the external coil temperature, the frosting degree of the outdoor unit can be more accurately determined, so that the time for executing the defrosting mode is more accurately determined, and the phenomenon of false defrosting or defrosting hysteresis is effectively avoided. Of course, the determination of the inner heating increment may also be performed based on other relationships between one or more of the above parameters and the inner heating increment, for example, only based on the corresponding relationships between the first and second saturation temperatures and the inner heating increment; or, the determination is only based on the corresponding relationship between the first inner coil temperature and the second inner coil temperature and the inner heating increment, and the like.
Further, in step S322, the average heating increment may be calculated according to the following formula (2):
IUAVGHeatQ＝∑IUHeatQ/∑HP (2)
in the formula (2), iuavfeedq is the average heating increment; IUHeatQ is the internal heating increment; HP is the number of indoor units.
In the formula (2), in the process of calculating the average heating increment, the influence of the capacity number of different indoor units on the heating capacity of the indoor units is considered, for example, the number of the first indoor unit is 1, the number of the second indoor unit is 1.5, the number of the third indoor unit is 2, and the different heating capacities of the number of the first indoor unit and the second indoor unit are correspondingly different, and the total heating increments of the three indoor units are averaged according to the total number of the three indoor units, so that the calculation result is more accurate, the frosting degree of the outdoor unit can be more accurately determined, and the opportunity of executing the defrosting mode is more accurately determined.
Or, in an alternative manner, in step S322, the average heating increase may be calculated according to the following equation (3):
IUAVGHeatQ＝∑IUHeatQ/N (3)
in formula (3), iuavfeedq is the average heating gain; IUHeatQ is the internal heating increment; n is the number of indoor units in operation.
Of course, the method of calculating the average heating increment is not limited to the two methods listed above, and a weighted average of all indoor units in an operating state may be calculated; or, the average value of the remaining internal heating increments other than the maximum internal heating increment and the minimum internal heating increment is calculated, and whatever calculation method is adopted, the average heating increment can be calculated.
Preferably, as shown in fig. 7, the step of "calculating the outdoor unit heating capacity increment of the outdoor unit" in step S312 specifically includes:
s341, respectively obtaining a third saturation temperature corresponding to a third exhaust pressure and a fourth saturation temperature corresponding to a fourth exhaust pressure of the compressor according to a preset time interval;
and S342, calculating the increment of the outdoor unit heating capacity according to the third saturation temperature and the fourth saturation temperature.
The preset time interval in step S341 is the same as the preset time interval in step S331, for example, the saturation temperature is detected once every 5min, and step S341 is executed while step S331 is executed, that is, the first saturation temperature and the second saturation temperature acquired in step S331 are the same as the third saturation temperature and the fourth saturation temperature acquired in step S341, so that only step S331 or step S341 may be executed, and the detection result of step S331 or step S341 is taken as the detection result of step S341 or step S331. Of course, the preset time interval in step S341 and the preset time interval in step S331 may also be different, and accordingly, the first saturation temperature and the second saturation temperature acquired in step S331 are different from the third saturation temperature and the fourth saturation temperature acquired in step S341.
In step S341, the third saturation temperature corresponding to the third exhaust pressure and the fourth saturation temperature corresponding to the fourth exhaust pressure may also be obtained according to a table lookup or a calculation manner listed in step S331, and the specific manner may refer to the corresponding description in step S331, and is not described herein again.
Further, in step S342, the outdoor unit heating capacity increment may be calculated according to the following formula (4):
OUHeatQ＝(Pd_temp 4 -Pd_temp 3 )×INVfix (4)
in the formula (4), OUHeatQ is the increment of the heating capacity of the outdoor unit; pd _ temp 3 Is the third saturation temperature; pd _ temp 4 Is the fourth saturation temperature; invsix is the frequency correction factor of the compressor.
In general, in different frequency bands of the compressor and under the same other conditions, the pressure change values of the multi-split air conditioning system in the same time period are different, that is, the lower the frequency of the compressor is, the larger the pressure change value of the multi-split air conditioning system is, as shown in table 2.
TABLE 2 relationship of frequency band of compressor to INVsix
| Frequency section of press (Hz) | INVfix |
| <70 | 1.3 |
| [70,80) | 1.1 |
| [80,90] | 1.0 |
| >90 | 0.9 |
It should be noted that, the above listed correspondence relationship between the frequency correction coefficient and the frequency band of the compressor and between the frequency correction coefficient and the frequency band of the compressor is only an example and is not a limitation, and those skilled in the art can flexibly adjust and set the frequency correction coefficient and the correspondence relationship between the frequency correction coefficient and the frequency band of the compressor according to the frequency band of the compressor in practical application.
In the formula (4), the heating capacity increment of the outdoor unit is determined by combining a plurality of parameters such as the third saturation temperature and the fourth saturation temperature, the parameters are brought into the defrosting determination condition again, and the frosting degree of the outdoor unit can be determined more accurately under the combined action of the parameters, the outdoor environment temperature and the temperature of the external coil pipe, so that the time for executing the defrosting mode is determined more accurately, and the phenomenon of false defrosting or defrosting delay is effectively avoided.
Preferably, in step S313, the total heating increment may be calculated according to the following equation (5):
SysHeatQ＝(IUAVGHeatQ-Q 1 )×K 1 +(OUHeatQ-Q 2 )×K 2 (5)
in the formula (5), SysHeatQ is the total heating increment; iuavghatq is the average heating gain; OUHeatQ is the heating capacity increment of the external unit; q 1 A first preset heating increment threshold value; q 2 A second preset heating increment threshold value; k 1 A first heating increment correction coefficient; k 2 The second heating increment correction coefficient.
Wherein the first heating increment correction coefficient K 1 And a second heating increment correction coefficient K 2 Is determined by the frequency of the compressor, and K 1 +K 2 1, for example, when the frequency of the compressor is stable (e.g., the current frequency of the compressor is in the range of 0.9 to 1.1 times the frequency of the compressor at the last detection), the first heating increment correction coefficient is 0.5, and the second heating increment correction coefficient is 0.5; when the frequency fluctuation of the compressor is relatively large (for example, the frequency of the current compressor is not in the range of 0.9-1.1 times of the frequency of the compressor at the last detection), the first heating increment correction coefficient is 0.6, and the second heating increment correction coefficient is 0.4.
It should be noted that the above listed correspondence relationship between the first heating increment correction coefficient and the second heating increment correction coefficient and the frequency fluctuation condition of the compressor is only exemplary and not restrictive, and those skilled in the art can flexibly adjust and set the first heating increment correction coefficient and the second heating increment correction coefficient and the first heating increment correction coefficient according to the frequency fluctuation condition of the compressor in practical applicationThe correspondence between the coefficient, the second heating increment correction coefficient, and the frequency fluctuation condition of the compressor is only made such that K 1 +K 2 1 is enough.
Wherein the first preset heating increment threshold value is 0.2-1.2, and the second preset heating increment threshold value is 0.5-2.5. Of course, the first preset heating increment threshold and the second preset heating increment threshold listed above are only exemplary, but not limiting, and a person skilled in the art may flexibly adjust and set the first preset heating increment threshold and the second preset heating increment threshold according to information such as a model of the multi-split air-conditioning system, a matching number of indoor units, and a use environment in an actual application, or may obtain the first preset heating increment threshold and the second preset heating increment threshold according to an experiment by a person skilled in the art under a specific working condition, and the first preset heating increment threshold and the second preset heating increment threshold may be determined no matter how, as long as the total heating increment of the multi-split air-conditioning system can be determined.
In the above formula (5), when the average heating increase is smaller than the first preset heating increase threshold, it indicates that the average heating increases of all the indoor units in the operating state start to decrease, and when the degree of frosting of the outdoor unit becomes more serious, the average heating increase becomes smaller. When the heating capacity increment of the outdoor unit is smaller than a second preset heating increment threshold, the heating capacity of the outdoor unit is reduced, and when the frosting degree of the outdoor unit is more and more serious, the reduction speed of the discharge pressure of the compressor is increased, so that the heating capacity increment of the outdoor unit is smaller and smaller. When the average heating increment is smaller than a first preset heating increment threshold or the heating capacity increment of the outdoor unit is smaller than a second preset heating increment threshold and the total heating increment is negative, the frosting degree of the outdoor unit is relatively serious.
The defrosting control method according to the present invention will be further described based on the calculation method of the total heating increment in step S300 and with reference to fig. 3.
As shown in fig. 3, the step S400 of determining whether to enable the multi-split air conditioning system to enter the defrosting mode according to the outdoor environment temperature, the temperature of the external coil and the total heating increment includes:
s410, judging whether the multi-split air conditioning system simultaneously meets the following three conditions:
condition 11: the outdoor environment temperature is less than a first preset temperature threshold;
condition 12: the temperature of the outer coil is smaller than a second preset temperature threshold;
condition 13: the total heating increment is smaller than a third preset heating increment threshold value;
if yes, go to step S420; if not, the multi-split air-conditioning system is enabled to maintain the heating mode, and the step S100 is returned until the multi-split air-conditioning system meets the defrosting condition;
and S420, enabling the multi-split air conditioning system to enter a defrosting mode.
In step S420, if the outdoor environment temperature is less than the first preset temperature threshold and the temperature of the external coil is less than the second preset temperature threshold, for example, the first preset temperature threshold is 10 ℃, the detected outdoor environment temperature is 8 ℃, which is lower than the first preset temperature threshold, the second preset temperature threshold is-10 ℃, the detected temperature of the external coil is-12 ℃, which is lower than the second preset temperature threshold, at this time, the outdoor environment temperature and the external judgment temperature of the outdoor unit are both lower, so that water entrained in the air in the outdoor environment when passing through the outdoor unit is condensed into frost and remains on the surface of the external coil in a frost form, so that the outdoor unit frosts.
In order to avoid the above situation, in step S420, it is further determined by combining the total heating increment, when the total heating increment is greater than or equal to a third preset heating increment threshold, for example, the third preset heating increment threshold is-0.3 (for example, the third preset heating increment threshold is the total heating increment of the air-conditioning system calculated according to the above formula when the outdoor unit is not frosted or slightly frosted under the current environmental parameters, the same applies below), and the calculated total heating increment is 0 and greater than the third preset heating increment threshold, which indicates that the frosting degree of the outdoor unit is relatively light, the total heating increment of the multi-split air-conditioning system is not changed, and does not have an obvious influence on the heating effect of the multi-split air-conditioning system, and at this time, defrosting is not required, and a phenomenon of false defrosting is avoided.
Further, when the total heating increment is smaller than a third preset heating increment threshold, for example, the third preset heating increment threshold is-0.3, the calculated total heating increment is-0.5, and the calculated total heating increment is smaller than the third preset heating increment threshold, which indicates that the frosting degree of the outdoor unit is very serious, so that the total heating increment of the multi-connected air-conditioning system is negative and smaller than the third preset heating increment threshold, which seriously affects the heating effect of the multi-connected air-conditioning system, and the outdoor unit needs to be defrosted, so that the multi-connected air-conditioning system enters a defrosting mode, the time for executing the defrosting mode is accurately determined, the phenomenon of defrosting hysteresis is avoided, and the indoor heating effect can be remarkably improved.
It should be noted that the first preset temperature threshold, the second preset temperature threshold, and the third preset heating increment threshold listed above are only exemplary, but not limiting, and those skilled in the art can obtain the first preset temperature threshold, the second preset temperature threshold, and the third preset heating increment threshold in practical applications according to experiments and combining with the outdoor environment temperature, for example, the first preset temperature threshold is any value between 5 ℃ and 20 ℃, the second preset temperature threshold is any value between-15 ℃ and-5 ℃, the third preset heating increment threshold is any value between-1.5 ℃ and-0.2, and the first preset temperature threshold, the second preset temperature threshold, and the third preset heating increment threshold can also be flexibly adjusted and set according to the model of the multi-split air conditioning system, the matching number of the indoor units, the use environment, and other information, however, the first preset temperature threshold, the second preset temperature threshold, and the third preset heating increment threshold may be adjusted and set as long as the timing for executing the defrost mode can be determined.
Referring now to fig. 8, a possible control flow of the present invention is described. Fig. 8 is a logic diagram of the defrost control method of the present invention. In fig. 8, the defrosting control method of the present invention is further illustrated by taking as an example that the first saturation temperature and the second saturation temperature for calculating the indoor heating increment are the same as the first saturation temperature and the second saturation temperature for calculating the outdoor heating capacity increment.
As shown in fig. 8, one possible complete flow of the defrost control method of the present invention is:
s501, under the condition that the multi-split air-conditioning system operates in the heating mode, a first saturation temperature Pd _ temp corresponding to a first exhaust pressure of a compressor is obtained 1 Temperature Tc of the first inner coil of the indoor unit 1 First indoor ambient temperature Tai 1 ；
S502, at an interval of 5min, acquiring a second saturation temperature Pd _ temp corresponding to a second exhaust pressure of the compressor 2 The temperature Tc of the second inner coil of the indoor unit 2 Second indoor ambient temperature Tai 2 And the matching number HP of the indoor unit according to Pd _ temp 1 、Pd_temp 2 、Tc 1 、Tc 2 、Tai 1 、Tai 2 And HP calculate total heating increment SysHeatQ;
s503, acquiring outdoor environment temperature Tao;
s504, acquiring the temperature Tdef of an external coil of the outdoor unit;
s505, judging whether the multi-split air conditioning system simultaneously meets the following three conditions:
condition 21: tao is less than T 1 Wherein, T 1 Is a first preset temperature threshold;
condition 22: tdef is less than T 2 Wherein, T 2 A second preset temperature threshold;
condition 23: SysHeatQ less than Q 3 Wherein Q is 3 A third preset heating increment threshold value;
if yes, go to step S506; if not, the multi-split air-conditioning system is enabled to maintain the heating mode, and the step S502 is returned until the multi-split air-conditioning system meets the defrosting condition;
and S506, enabling the multi-split air conditioning system to enter a defrosting mode.
It should be noted that the above-mentioned embodiment is only a preferred embodiment of the present invention, and is only used for illustrating the principle of the method of the present invention, and is not intended to limit the protection scope of the present invention, and in practical applications, those skilled in the art can implement the above-mentioned function allocation by different steps, i.e. re-dividing or combining the steps in the embodiment of the present invention, as required. For example, the steps of the above embodiments may be combined into one step, or may be further split into multiple sub-steps, so as to complete all or part of the functions described above. For the names of the steps involved in the embodiments of the present invention, they are only for distinguishing the respective steps, and are not to be construed as limiting the present invention.
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 (7)
1. A defrosting control method for a multi-split air conditioning system, wherein the multi-split air conditioning system comprises a compressor, an outdoor unit and a plurality of indoor units, and the defrosting control method comprises the following steps:
acquiring outdoor environment temperature under the condition that the multi-split air-conditioning system operates in a heating mode;
acquiring the temperature of an external coil of the outdoor unit;
calculating the total heating increment of the multi-split air conditioning system;
judging whether the multi-split air-conditioning system enters a defrosting mode or not according to the outdoor environment temperature, the temperature of the outer coil and the total heating increment;
the step of calculating the total heating increment of the multi-split air conditioning system specifically comprises the following steps of:
calculating the average heating increment of all indoor units in the running state;
calculating the increment of the outdoor unit heating capacity of the outdoor unit;
calculating the total heating increment according to the average heating increment and the outdoor unit heating capacity increment;
the step of calculating the average heating increment of all indoor units in the running state specifically comprises the following steps:
respectively calculating the internal heating increment of each indoor unit in the running state;
calculating an average value of all the inner heating increments, and taking the average value as the average heating increment;
calculating an internal heating increment of any one of the indoor units according to the following method:
respectively acquiring a first saturation temperature corresponding to a first exhaust pressure and a second saturation temperature corresponding to a second exhaust pressure of the compressor according to a preset time interval;
respectively acquiring the temperature of a first inner coil and the temperature of a second inner coil of the indoor unit according to the preset time interval;
respectively acquiring a first indoor environment temperature and a second indoor environment temperature according to the preset time interval;
acquiring the number of the indoor units;
and calculating the inner heating increment according to the first saturation temperature, the second saturation temperature, the first inner coil pipe temperature, the second inner coil pipe temperature, the first indoor environment temperature, the second indoor environment temperature and the matching number of the indoor unit.
2. The defrost control method of claim 1, wherein the step of calculating the indoor heating delta based on the first saturation temperature, the second saturation temperature, the first inner coil temperature, the second inner coil temperature, the first indoor ambient temperature, the second indoor ambient temperature, and the number of indoor units comprises:
the internal heating gain is calculated according to the following formula:
IUHeatQ＝{(Pd_temp 2 -Tc 2 )-(Pd_temp 1 -Tc 1 )+(Tai 2 -Tai 1 )}×HP×QFixRate
wherein IUHeatQ is the internal mechanismA heat increment; pd _ temp 1 Is the first saturation temperature; pd _ temp 2 Is the second saturation temperature; tc 1 Is the first inner coil temperature; tc 2 Is the second inner coil temperature; tai 1 Is the first indoor ambient temperature; tai (Tai) 2 Is the second indoor ambient temperature; HP is the number of the indoor units; QFixRate is the temperature correction coefficient of the indoor environment temperature;
wherein the temperature correction coefficient QFixRate is determined by the outdoor ambient temperature Tao and/or the indoor ambient temperature Tai.
3. The defrosting control method according to claim 1 or 2, wherein the step of "calculating an average value of all the inner heating increments, and taking the average value as the average heating increment" specifically includes:
the average heating increment is calculated according to the following formula:
IUAVGHeatQ＝∑IUHeatQ/∑HP
wherein iuavfeedq is the average heating gain; IUHeatQ is the internal heating increment; and HP is the number of the indoor units.
4. The defrost control method as defined in claim 1, wherein the step of calculating an outdoor unit heating capacity increment of the outdoor unit includes:
respectively acquiring a third saturation temperature corresponding to a third exhaust pressure of the compressor and a fourth saturation temperature corresponding to a second exhaust pressure according to a preset time interval;
and calculating the heating capacity increment of the outer machine according to the third saturation temperature and the fourth saturation temperature.
5. The defrost control method of claim 4, wherein the step of calculating the outdoor unit heating capacity increase based on the third saturation temperature and the fourth saturation temperature comprises:
calculating the increment of the heating capacity of the outdoor unit according to the following formula:
OUHeatQ＝(Pd_temp 4 -Pd_temp 3 )×INVfix
wherein OUHeatQ is the heating capacity increment of the external unit; pd _ temp 3 Is the third saturation temperature; pd _ temp 4 Is the fourth saturation temperature; the INVfix is a frequency correction coefficient of the compressor;
wherein the frequency correction factor INVfix is determined by the frequency of the compressor.
6. The defrost control method according to claim 1, wherein the step of calculating the total heating increase based on the average heating increase and the outdoor heating capacity increase includes:
the total heating gain is calculated according to the following formula:
SysHeatQ＝(IUAVGHeatQ-Q 1 )×K 1 +(OUHeatQ-Q 2 )×K 2
wherein SysHeatQ is the total heating gain; iuavfeedq is the average heating increment; OUHeatQ is the heating capacity increment of the external unit; q 1 Is a first preset heating increment threshold value; q 2 A second preset heating increment threshold value; k 1 Correcting the coefficient for the first heating increment; k 2 A second heating increment correction coefficient;
wherein the first heating increment correction coefficient K 1 And/or the second heating increment correction coefficient K 2 Determined by the frequency of the compressor.
7. The defrosting control method according to claim 1, wherein the step of determining whether to put the multi-split air conditioning system into the defrosting mode according to the outdoor environment temperature, the temperature of the external coil, and the total heating increment specifically includes:
judging whether the multi-split air conditioning system simultaneously meets the following conditions:
the outdoor environment temperature is less than a first preset temperature threshold;
the temperature of the outer coil is less than a second preset temperature threshold;
the total heating increment is smaller than a third preset heating increment threshold value;
and under the condition that the multi-split air-conditioning system simultaneously meets the conditions, enabling the multi-split air-conditioning system to enter a defrosting mode.
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| CN114963452B (en) * | 2022-05-31 | 2023-11-14 | 宁波奥克斯电气股份有限公司 | Air conditioner defrosting method and device, multi-connected air conditioner system and storage medium |
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| JP5435069B2 (en) * | 2012-05-01 | 2014-03-05 | ダイキン工業株式会社 | Air conditioning system and defrosting operation method |
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| US10746446B2 (en) * | 2015-12-21 | 2020-08-18 | Lennox Industries Inc. | Intelligent defrost control method |
| CN107166644A (en) * | 2017-05-17 | 2017-09-15 | 青岛海尔空调器有限总公司 | Air conditioner defrosting control method |
| CN108800416A (en) * | 2018-05-24 | 2018-11-13 | 青岛海尔空调器有限总公司 | air conditioner defrosting control method |
| CN108800439A (en) * | 2018-05-24 | 2018-11-13 | 青岛海尔空调器有限总公司 | air conditioner defrosting control method |
| CN110017583B (en) * | 2019-03-12 | 2021-12-21 | 青岛海尔空调电子有限公司 | Air conditioner and defrosting control method thereof |
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| CN110319536A (en) * | 2019-07-02 | 2019-10-11 | 宁波奥克斯电气股份有限公司 | A kind of defrosting control method of multi-online air-conditioning system, device and multi-online air-conditioning system |
| CN111207486A (en) * | 2020-01-14 | 2020-05-29 | 珠海格力电器股份有限公司 | Intelligent defrosting control method for air conditioner, computer readable storage medium and air conditioner |
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