CN112303843A - Method for determining reference frequency of compressor in multi-split air conditioner - Google Patents
Method for determining reference frequency of compressor in multi-split 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
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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
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- 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
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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
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- 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
- F24F11/86—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling compressors within refrigeration or heat pump circuits
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- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
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Abstract
The invention belongs to the technical field of air conditioners, and particularly relates to a method for determining reference frequency of a compressor in a multi-split air conditioner. The invention aims to solve the problem that the refrigeration or heating effect is influenced because the determination result of the reference frequency of the compressor of the conventional multi-split air conditioner is not in accordance with the actual requirement. For this purpose, according to the method for determining the reference frequency of the compressor in the multi-split air conditioner, when determining the reference frequency of the compressor, the factors such as the rated capacity of each indoor unit, the set indoor temperature value, the current indoor temperature value of the indoor unit, the current outdoor temperature value, the current working mode of the multi-split air conditioner and the like are considered. Therefore, the determination result of the reference frequency of the compressor of the multi-split air conditioner is more in line with the actual requirement, the multi-split air conditioner is ensured to achieve the target adjusting effect in a short time, the multi-split air conditioner can operate more stably, the noise is reduced, the electric energy is saved, and meanwhile, the refrigerating or heating effect of the multi-split air conditioner is ensured.
Description
Technical Field
The invention belongs to the technical field of air conditioners, and particularly relates to a method for determining reference frequency of a compressor in a multi-split air conditioner.
Background
In the starting stage of the multi-split air conditioner, a compressor of the outdoor unit of the multi-split air conditioner generally needs to operate for a period of time at a reference frequency, and then the operating frequency of the compressor is adjusted according to specific conditions. The determination of the reference frequency of the compressor of the multi-split air conditioner at the initial operation stage has an important influence on the time required to achieve the target adjustment effect and the stability of the operation of the multi-split air conditioner.
Chinese patent application document (CN111256335A) discloses a control method for a variable frequency compressor in a heat pump air conditioner, the heat pump air conditioner includes an outdoor unit, a plurality of indoor units and a control valve, the outdoor unit is installed with the variable frequency compressor, the control valve is used for controlling the plurality of indoor units to simultaneously cool or heat, the control method includes the following steps: receiving a starting signal of a heat pump air conditioner and the refrigerating and heating requirements of an indoor unit; searching a comparison table of preset outdoor temperature and platform starting parameters corresponding to the refrigerating and heating requirements, wherein the platform starting parameters in the comparison table comprise initial platform frequency, the number of starting platforms and the frequency increasing speed among the starting platforms, and the number of the starting platforms is the number of the initial platform frequency; acquiring the current outdoor environment temperature; searching a platform starting parameter of the variable frequency compressor corresponding to the current outdoor environment temperature in a comparison table; and controlling the variable frequency compressor to operate according to the platform starting parameters in the starting stage of the variable frequency compressor.
It can be known that the factors considered in the determination process of the reference frequency of the existing compressor mainly include: initial platform frequency, ramp up speed between startup platforms, and outdoor ambient temperature. However, since the actual ambient temperature and the set temperature of each indoor unit have a large influence on the stability of the operation of the multi-split air conditioner, the determination result of the reference frequency of the conventional compressor still has a problem that the reference frequency does not meet the actual requirement. For example, when the reference frequency of the compressor is too small, it results in too long time required to achieve the target regulation effect; when the reference frequency of the compressor is too high, the operation of the multi-split air conditioner is extremely unstable, the operation noise is high, the power consumption is low, and the like.
Accordingly, there is a need in the art for a new method of determining a reference frequency of a compressor in a multi-split air conditioner to solve the above-mentioned problems.
Disclosure of Invention
In order to solve the above-mentioned problems in the prior art, that is, to solve the problem that the determination result of the reference frequency of the compressor of the existing multi-split air conditioner is not in accordance with the actual demand, and the cooling or heating effect is affected, the present invention provides a method for determining the reference frequency of the compressor in the multi-split air conditioner, wherein the multi-split air conditioner comprises an outdoor unit and a plurality of indoor units, and the determining method comprises: acquiring the rated capacity of each currently started indoor unit, a set indoor temperature value, a current indoor temperature value of the indoor unit, a current outdoor temperature value and a current working mode of the multi-split air conditioner; the working modes comprise a cooling mode and a heating mode; determining a first capacity correction coefficient of each indoor unit based on a first capacity correction coefficient of a predetermined indoor unit, the set indoor temperature value and a first mapping relation of the current indoor temperature value in the working mode; determining the total capacity requirement of all currently started indoor units based on the rated capacity of each indoor unit, the set indoor temperature value, the current indoor temperature value and the first capacity correction coefficient; determining a second capacity correction coefficient of the outdoor unit based on a second mapping relation between a predetermined second capacity correction coefficient of the outdoor unit and the current outdoor temperature value in the working mode; determining the capacity demand total amount of the outdoor unit based on the capacity demand total amount of all the indoor units and the second capacity correction coefficient; and determining the reference frequency of the compressor based on the total capacity demand of the outdoor unit and the refrigerating or heating capacity of the outdoor unit at the unit frequency of the compressor.
As a preferable technical solution of the above-mentioned determining method provided by the present invention, a formula used in the step of determining the total capacity demand of all currently-turned-on indoor units based on the rated capacity of each indoor unit, the set indoor temperature value, the current indoor temperature value, and the first capacity correction coefficient is: sin＝∑[(|Tc–Ts|+ΔD)·Rin·Hp](ii) a Wherein S isinThe total capacity requirement of all indoor units which are started at present is as follows: w; t iscThe unit of the current indoor temperature value of the indoor unit is as follows: DEG C; t issThe indoor temperature value is set for the indoor unit, and the unit is as follows: DEG C; and delta D is the capacity requirement stop allowable temperature difference set when the indoor unit leaves a factory or is installed, and the unit is as follows: DEG C; rinA first capacity correction factor for the indoor unit; hpThe rated capacity of the indoor unit.
As a preferable aspect of the determining method provided by the present invention, a formula used in the step of determining the total capacity demand of the outdoor unit based on the total capacity demand of all the indoor units and the second capacity correction coefficient is: sout＝Sin·Rout(ii) a Wherein S isoutThe total capacity demand of the outdoor unit is as follows: w; sinThe total capacity demand of all the indoor units currently on,the unit is: w; routThe second capacity correction coefficient of the outdoor unit.
As a preferable aspect of the determining method according to the present invention, the formula for the step of determining the reference frequency of the compressor based on the total capacity demand of the outdoor unit and the cooling or heating capacity of the outdoor unit per unit frequency of the compressor is: f ═ Sout/Pe(ii) a Wherein, F is the reference frequency of the compressor, and the unit is: hz; soutThe total capacity demand of the outdoor unit is as follows: w; peThe unit is the refrigerating or heating capacity of the outdoor unit under the unit frequency of the compressor: w/Hz.
As a preferable aspect of the determination method according to the present invention, the step of determining the first capacity correction coefficient for each indoor unit based on a first mapping relationship between the first capacity correction coefficient for the predetermined indoor unit, the set indoor temperature value, and the current indoor temperature value in the operation mode includes: determining a first mapping relation in the working mode as a selected first mapping relation based on the working mode; determining a set indoor temperature value interval in which the set indoor temperature value is located as a selected set indoor temperature value interval from among a plurality of consecutive set indoor temperature value intervals which are divided in advance by the selected first mapping relation; calculating an absolute value of a temperature difference between the set indoor temperature value and the current indoor temperature value; determining a temperature difference absolute value interval in which the temperature difference absolute value is located as a selected temperature difference absolute value interval in a plurality of continuous temperature difference absolute value intervals which are divided in advance of the selected first mapping relation; and determining a first capacity correction coefficient of the indoor unit in the selected first mapping relation based on the selected set indoor temperature value interval and the selected temperature difference absolute value interval.
As a preferred technical solution of the determining method provided by the present invention, in the selected first mapping relationship in the cooling mode, for the same set indoor temperature value interval, the first capacity correction coefficient gradually increases when different temperature difference absolute value intervals are arranged in the order of the temperature difference absolute values from small to large; in the selected first mapping relation in the cooling mode, aiming at the same absolute temperature difference value interval, when different set indoor temperature value intervals are arranged according to the sequence of the set indoor temperature values from small to large, the first capacity correction coefficient is gradually reduced; in the selected first mapping relation in the cooling mode, a first capacity correction coefficient of the indoor unit, which is determined based on the set indoor temperature value interval commonly used in the cooling mode and the minimum absolute temperature difference value interval, is 1.
As a preferred technical solution of the determining method provided by the present invention, in the selected first mapping relationship in the heating mode, for the same set indoor temperature value interval, the first capacity correction coefficient gradually increases when different temperature difference absolute value intervals are arranged in the order of the temperature difference absolute values from small to large; in the selected first mapping relation in the heating mode, for the same absolute temperature difference value interval, the first capacity correction coefficient is gradually increased when different set indoor temperature value intervals are arranged according to the sequence of the set indoor temperature values from small to large; in the selected first mapping relation in the heating mode, a first capacity correction coefficient of the indoor unit, which is determined based on the set indoor temperature value section commonly used in the heating mode and the minimum absolute temperature difference value section, is 1.
As a preferable aspect of the determining method provided by the present invention, the step of determining the second capacity correction coefficient of the outdoor unit based on a second mapping relationship between a predetermined second capacity correction coefficient of the outdoor unit and the current outdoor temperature value in the operation mode includes: determining a second mapping relation in the working mode as a selected second mapping relation based on the working mode; determining a current outdoor temperature value interval in which the current outdoor temperature value is located as a selected current outdoor temperature value interval in a plurality of pre-divided current outdoor temperature value intervals of the selected second mapping relationship; and determining a second capacity correction coefficient of the outdoor unit in the selected second mapping relation based on the selected current outdoor temperature value interval.
As a preferred technical solution of the determining method provided by the present invention, in the selected second mapping relationship in the cooling mode, when different current outdoor temperature value intervals are arranged according to a sequence of the current outdoor temperature values from small to large, the second capability correction coefficient is gradually increased; in the selected second mapping relationship in the cooling mode, a second capacity correction coefficient of the outdoor unit determined based on the current outdoor temperature value interval commonly used in the cooling mode is 1.
As a preferred technical solution of the determining method provided by the present invention, in the selected second mapping relationship in the heating mode, when different current outdoor temperature value intervals are arranged according to the sequence of the current outdoor temperature values from large to small, the second capacity correction coefficient is gradually increased; in the selected second mapping relationship in the heating mode, a second capacity correction coefficient of the outdoor unit, which is determined based on the current outdoor temperature value section that is commonly used in the heating mode, is 1.
According to the method for determining the reference frequency of the compressor in the multi-split air conditioner, the total capacity demand of all the indoor units which are started at present is determined based on the rated capacity of each indoor unit, the set indoor temperature value, the current indoor temperature value and the first capacity correction coefficient, then the total capacity demand of the outdoor unit is determined based on the total capacity demand of all the indoor units and the second capacity correction coefficient, and finally the reference frequency of the compressor is determined based on the total capacity demand of the outdoor unit and the refrigerating or heating capacity of the outdoor unit under the unit frequency of the compressor. Therefore, the factors such as the rated capacity of each indoor unit, the set indoor temperature value, the current indoor temperature value of the indoor unit, the current outdoor temperature value, the current working mode of the multi-split air conditioner and the like are fully considered when the reference frequency of the compressor is determined. Therefore, the determination result of the reference frequency of the compressor of the multi-split air conditioner can better meet the actual requirement, the multi-split air conditioner can achieve the target regulation effect in a short time, the multi-split air conditioner can operate more stably, the noise is reduced, the electric energy is saved, and the refrigerating or heating effect of the multi-split air conditioner is ensured.
In addition, according to the method for determining a reference frequency of a compressor in a multi-split air conditioner of the present invention, a first capacity correction coefficient of each indoor unit is determined based on a first mapping relationship between a predetermined first capacity correction coefficient of the indoor unit and a set indoor temperature value, and a current indoor temperature value in an operation mode, and a second capacity correction coefficient of the outdoor unit is determined based on a second mapping relationship between a predetermined second capacity correction coefficient of the outdoor unit and a current outdoor temperature value in an operation mode. Therefore, by determining the first capacity correction coefficient and the second capacity correction parameter, the difficulty level of adjusting the current indoor temperature value of the indoor unit to the set indoor temperature value or the change condition of the operating frequency of the compressor in the multi-split air conditioner in the subsequent working process is considered under various conditions of different working modes, different outdoor temperature values, different current indoor temperature values of the indoor unit and different set indoor temperature values of the multi-split air conditioner. Therefore, the multi-split air conditioner is further ensured to achieve the target adjusting effect in a short time, the multi-split air conditioner can operate more stably, noise is reduced, electric energy is saved, and the refrigerating or heating effect of the multi-split air conditioner is further ensured.
Drawings
A method of determining a reference frequency of a compressor in a multi-split air conditioner according to the present invention will be described with reference to the accompanying drawings. In the drawings:
fig. 1 is a schematic structural view of a multi-split air conditioner according to the present embodiment;
fig. 2 is a flowchart illustrating a method of determining a reference frequency of a compressor in a multi-split air conditioner according to the present embodiment;
fig. 3 is a flowchart illustrating a process of determining a first capability correction factor of an indoor unit according to the present embodiment;
fig. 4 is a flowchart illustrating a process of determining the second capability correction factor of the outdoor unit according to this embodiment.
List of reference numerals
1-an outdoor unit; 11-outdoor temperature detector; 12-a compressor; 13-condenser
2-an indoor unit; 21-indoor temperature detector;
3-an electronic expansion valve;
41-trachea; 42 liquid pipe.
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 first mapping relationship and the second mapping relationship of the present embodiment are expressed by tables, the expression manner of the first mapping relationship and the second mapping relationship is not the same, and those skilled in the art can adjust them as needed to adapt to specific application situations without departing from the principle of the present invention. For example, the first mapping relationship and the second mapping relationship of the present embodiment may also be represented by a form of a multivariate function.
It should be noted that in the description of the present invention, the terms of direction or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, which are merely for convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
Furthermore, it should be noted that, in the description of the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In order to solve the problem that the determination result of the reference frequency of the compressor of the conventional multi-split air conditioner is not consistent with the actual requirement, and the cooling or heating effect is affected, the present embodiment provides a method for determining the reference frequency of the compressor in the multi-split air conditioner, which is exemplarily illustrated by the multi-split air conditioner shown in fig. 1, the multi-split air conditioner includes an outdoor unit 1 and a plurality of indoor units 2, a refrigerant circulation pipeline is formed between the outdoor unit 1 and the plurality of indoor units 2 through an air pipe 41, a liquid pipe 42, and an electronic expansion valve 3 connected to the liquid pipe 42, a compressor 12 and a condenser 13 are arranged in the outdoor unit 1, an outdoor temperature detector 11 for detecting the current outdoor temperature value is further arranged on the outdoor unit 1, and an indoor temperature detector 21 for detecting the current indoor temperature value is further arranged on the indoor unit.
The method for determining the reference frequency of the compressor in the multi-split air conditioner provided by the embodiment comprises the following steps:
s1, acquiring the rated capacity of each currently started indoor unit, setting an indoor temperature value, the current indoor temperature value of the indoor unit, the current outdoor temperature value and the current working mode of the multi-split air conditioner; wherein the working mode comprises a cooling mode and a heating mode;
it should be noted that the rated powers of the different indoor units may be the same or may be different, and the rated power of each indoor unit may be stored in the controller of the multi-split air conditioner in advance as a parameter to be acquired when the indoor unit is turned on and used when needed, so as to facilitate the control of the multi-split air conditioner and the determination of the reference frequency of the compressor.
The set indoor temperature is usually a specific temperature value set by a user, or after the user selects high temperature, medium temperature and low temperature, corresponding temperature values are corresponding to the high temperature, medium temperature and low temperature. The current temperature value of the indoor unit can be obtained by an indoor temperature detector, and the current outdoor temperature value can be obtained by an outer temperature detector. The working mode of the air conditioner can determine whether the current mode is a cooling mode or a heating mode by comparing the set indoor temperature value with the current indoor temperature value of the indoor unit. For example, when the indoor temperature value is set to be greater than the current indoor temperature value of the indoor unit, generally, the working mode of the current multi-split air conditioner is a heating mode; when the set indoor temperature value is smaller than the current indoor temperature value of the indoor unit, generally, the working mode of the current multi-split air conditioner is a cooling mode.
And S2, determining a first capacity correction coefficient of each indoor unit based on a first capacity correction coefficient of the predetermined indoor unit, the set indoor temperature value and a first mapping relation of the current indoor temperature value in the working mode.
As shown in fig. 3, step S2 specifically includes:
and S21, determining the first mapping relation in the working mode as the selected first mapping relation based on the working mode. For example, the first mapping relationship in the cooling mode may be a determination table of the first capacity correction coefficient in the cooling mode as shown in table 1, and the first mapping relationship in the heating mode may be a determination table of the first capacity correction coefficient in the heating mode as shown in table 2.
In tables 1 and 2, TcThe unit of the current indoor temperature value of the indoor unit is as follows: DEG C; t issThe indoor temperature value is set for the indoor unit, and the unit is as follows: DEG C; rinThe coefficient is corrected for the first capacity of the indoor unit.
S22, among a plurality of consecutive preset indoor temperature value intervals obtained by dividing the first mapping relationship in advance, a set indoor temperature value interval in which the set indoor temperature value is located is determined as the selected set indoor temperature value interval. As shown in table 1, in the cooling mode, the plurality of consecutive indoor temperature value setting intervals are: <20, [20,24 ], [24,27], > 27; as shown in table 2, in the heating mode, the plurality of consecutive set indoor temperature value intervals are: <18, [18,22), [22,25], > 25.
It should be noted that the specific dividing amounts and manners of the plurality of consecutive indoor temperature value setting intervals in tables 1 and 2 of the present embodiment are only exemplary, and should not be construed as unduly limiting the scope of the present invention. In addition, those skilled in the art may provide other methods for dividing a plurality of consecutive indoor temperature value setting intervals according to specific situations.
And S23, calculating the absolute value of the temperature difference between the set indoor temperature value and the current indoor temperature value. Since the set indoor temperature value is generally smaller than the current indoor temperature value in the cooling mode, T is calculated in the cooling modec-Ts(ii) a Since the indoor temperature value set in the heating mode is generally larger than the current indoor temperature value, T is calculated in the heating modes-Tc。
And S24, determining the temperature difference absolute value interval in which the temperature difference absolute value is located as the selected temperature difference absolute value interval in a plurality of pre-divided continuous temperature difference absolute value intervals of the selected first mapping relation.
As shown in tables 1 and 2, the absolute values of the temperature differences in a plurality of consecutive intervals are: <1, [1,3), [3,5), [5,10), > < 10.
And S25, determining a first capacity correction coefficient of the indoor unit in the selected first mapping relation based on the selected set indoor temperature value interval and the selected temperature difference absolute value interval.
In table 1, the first capability correction coefficient R is showninIt is only a reference value, and those skilled in the art can adjust it as needed, but no matter how the specific value is adjusted, it should fall within the scope of the description of the embodiment.
For example, in the cooling mode, when the selected indoor temperature value interval is [20,24 ], the selected temperature difference absolute value interval is [20,24 ]<1, the first capacity correction coefficient R corresponding to the first capacity correction coefficient determination table in the cooling mode in table 1 is foundinIs 1.0.
For another example, in the heating mode, when the indoor temperature value interval is set to [22,25]]The absolute value interval of the temperature difference is selected as<In case 1, the first capacity correction coefficient R corresponding to the first capacity correction coefficient determination table in the heating mode shown in table 2 is used as the first capacity correction coefficientinIs 1.0.
Table 1 first capacity correction coefficient determining table in cooling mode
As a preferred embodiment of the above determination method provided in this embodiment, it can be seen from table 1 that, in the cooling mode, the indoor temperature value T is setsWhen the same, the larger the value in the absolute value interval of the temperature difference, i.e. Tc-TsThe larger the load of the compressor required for reducing the temperature in the set room, the larger the first capacity correction coefficient. Therefore, the setting principle of the first capability correction factor includes: in the selected first mapping relation in the cooling mode, aiming at the same set indoor temperature value interval, the first capacity correction coefficient is gradually increased when different temperature difference absolute value intervals are arranged according to the sequence of the temperature difference absolute values from small to large.
As can be seen from Table 1, the absolute value of the temperature difference (i.e., T) is within the range of the absolute value of the temperature difference in the cooling modec-Ts) When the same, set indoor temperature value TsThe larger the temperature is, the easier it is to lower the same temperature, and the smaller the load of the compressor required for the corresponding operation is, the smaller the first capacity correction coefficient is. Therefore, the setting and restoring of the first capability correction factor includes: in the selected first mapping relation in the cooling mode, for the same temperature difference absolute value interval, the first capacity correction coefficient is gradually reduced when different set indoor temperature value intervals are arranged according to the sequence of the set indoor temperature values from small to large.
In the selected first mapping relation in the cooling mode, a first capacity correction coefficient of the indoor unit, which is determined based on a set indoor temperature value interval commonly used in the cooling mode and a minimum temperature difference absolute value interval, is 1.
As can be seen from table 1, in the cooling mode, the temperature difference absolute value interval (i.e., T) is considered to be the most frequent case where the indoor temperature value is set within the range of [20,24 ]c-Ts) At the minimum, namely<1, the indoor temperature value is easy to reach and the load of the compressor is minimum, so the first capacity correction coefficient of the indoor unit under the condition is 1, and the first capacity under other conditionsThe correction coefficient is specifically set with reference to this condition.
As a preferred embodiment of the above determination method provided in this embodiment, it can be seen from table 2 that, in the heating mode, the indoor temperature value T is setsWhen the same, the larger the value in the absolute value interval of the temperature difference, i.e. Ts-TcThe larger the load of the compressor required for increasing the temperature to the set indoor temperature is, the larger the first capacity correction coefficient is. Therefore, the setting principle of the first capability correction factor includes: in the selected first mapping relation under the heating mode, aiming at the same set indoor temperature value interval, the first capacity correction coefficient is gradually increased when different temperature difference absolute value intervals are arranged according to the sequence of temperature difference absolute values from small to large.
As can be seen from Table 2, the absolute value of the temperature difference (i.e., T) is within the heating modes-Tc) When the same, set indoor temperature value TsThe larger the temperature is, the more difficult it is to raise the same temperature, the larger the load of the compressor required for the same, and the larger the first capacity correction coefficient is. Therefore, the setting principle of the first capability correction factor includes: in the selected first mapping relation in the heating mode, for the same temperature difference absolute value interval, the first capacity correction coefficient is gradually increased when different set indoor temperature value intervals are arranged according to the sequence of the set indoor temperature values from small to large.
In the selected first mapping relation in the heating mode, a first capacity correction coefficient of the indoor unit, which is determined based on a set indoor temperature value interval commonly used in the heating mode and a minimum temperature difference absolute value interval, is 1. As can be seen from Table 2, the indoor temperature values are set to [22,25] in consideration of the heating mode]The temperature difference is within the range (i.e. T)s-Tc) At the minimum, namely<When 1, the indoor temperature value is most easily reached, and the load of the corresponding needed compressor is minimum, so the first capacity correction coefficient of the indoor unit under the condition is 1, and the first capacity correction coefficients under other conditions are specifically set by referring to the condition.
Table 2 first ability correction coefficient determination table in heating mode
S3, determining the total capacity requirement of all the indoor units which are started currently based on the rated capacity of each indoor unit, the set indoor temperature value, the current indoor temperature value and the first capacity correction coefficient;
the formula available in step S3 is: sin＝∑[(|Tc–Ts|+ΔD)·Rin·Hp](ii) a Wherein S isinThe total capacity requirement of all indoor units which are started at present is as follows: w (i.e., "watts"); t iscThe unit of the current indoor temperature value of the indoor unit is as follows: DEG C; t issThe indoor temperature value is set for the indoor unit, and the unit is as follows: DEG C; Δ D is a capacity requirement stop allowable temperature difference set when the indoor unit leaves a factory or is installed, and may be generally set to 1 ℃, and the unit is: DEG C; rinA first capacity correction factor for the indoor unit; hpThe rated capacity of the indoor unit is as follows: w (i.e., "watts"). Wherein "° c" means "degrees celsius".
And S4, determining a second capacity correction coefficient of the outdoor unit based on a second mapping relation between the predetermined second capacity correction coefficient of the outdoor unit and the current outdoor temperature value in the working mode. As shown in fig. 4, step S4 specifically includes:
and S41, determining the second mapping relation in the working mode as the selected second mapping relation based on the working mode.
For example, in the present embodiment, the second mapping relationship in the cooling mode is a second capacity correction coefficient determination table in the cooling mode as shown in table 3; the second mapping relationship in the heating mode in this embodiment is a second capability correction coefficient determination table in the heating mode as shown in table 4.
Wherein, Tao in table 1 and table 2 represents the current outdoor temperature value in units of ℃ (i.e., "celsius"); soutThe total capacity demand of the outdoor unit is as follows: w (i.e., "watts").
And S42, determining the current outdoor temperature value interval in which the current outdoor temperature value is located as the selected current outdoor temperature value interval in a plurality of pre-divided current outdoor temperature value intervals in which the second mapping relation is selected.
Illustratively, in table 3, the current outdoor temperature value interval in the cooling mode is divided into: <28, [28,33), [33,37), [37,40) and > -40; in table 4, the current outdoor temperature value interval in the heating mode is divided into: 25, [15,25), [5,15), [ -5,5), [ -15, -5) and < -15.
It should be noted that the specific dividing amounts and manners of the multiple consecutive current outdoor temperature value intervals in tables 3 and 4 of this embodiment are only exemplary, and should not be construed as unduly limiting the scope of the present invention. Besides, those skilled in the art can provide other dividing methods for the plurality of consecutive current outdoor temperature value intervals according to specific situations.
And S43, determining a second capacity correction coefficient of the outdoor unit based on the selected current outdoor temperature value interval in the selected second mapping relation.
Exemplarily, as in table 3, in the cooling mode, when the current outdoor temperature value interval is [33,37), the corresponding second capability correction coefficient is 1.0; as shown in table 4, in the heating mode, when the current outdoor temperature value interval is [5,15), the corresponding second capacity correction coefficient is set to 1.0.
Table 3 second capacity correction coefficient determining table in cooling mode
| Tao/(℃) | Sout |
| <28 | 0.6 |
| [28,33) | 0.8 |
| [33,37) | 1.0 |
| [37,40) | 1.5 |
| >＝40 | 1.8 |
Table 4 second ability correction coefficient determination table in heating mode
| Tao(℃) | TaRate_OUT |
| >＝25 | 0.6 |
| [15,25) | 0.8 |
| [5,15) | 1.0 |
| [-5,5) | 1.6 |
| [-15,-5) | 2.0 |
| <-15 | 2.5 |
As a preferred embodiment of the above determination method provided in this embodiment, as shown in table 3, in the cooling mode, as the current outdoor temperature value Tao is larger, cooling is more difficult, and the load of the compressor required for the cooling is larger, the corresponding second capacity correction coefficient is also larger. Therefore, the setting principle of the second capability correction factor includes: in the selected second mapping relation in the refrigeration mode, the second capacity correction coefficient is gradually increased when different current outdoor temperature value intervals are arranged according to the sequence of the current outdoor temperature values from small to large.
As can be seen from table 3, in the cooling mode, in consideration of the fact that the current outdoor temperature value Tao is in the range of [33,37 ], the second capacity correction coefficient of the indoor unit under this condition is set to 1, and the first capacity correction coefficient under the other conditions is specifically set with reference to this condition. That is, in the selected second mapping relationship in the cooling mode, the second capacity correction coefficient of the outdoor unit determined based on the current outdoor temperature value section commonly used in the cooling mode is 1.
As a preferred embodiment of the above determination method provided in this embodiment, as shown in table 4, in the heating mode, the smaller the current outdoor temperature value Tao is, the more difficult the heating is, and the larger the load of the compressor required for the heating is, the larger the second capacity correction coefficient corresponding thereto is. Therefore, the setting principle of the second capability correction factor includes: in the selected second mapping relation under the heating mode, the second capacity correction coefficient is gradually increased when different current outdoor temperature value intervals are arranged according to the sequence of the current outdoor temperature values from large to small.
As can be seen from table 4, in the heating mode, in consideration of the fact that the current outdoor temperature value Tao is in the range of [5,15 ], the second capacity correction coefficient of the indoor unit under this condition is set to 1, and the second capacity correction coefficient under another condition is specifically set with reference to this condition. That is, in the selected second mapping relationship in the heating mode, the second capacity correction coefficient of the outdoor unit determined based on the current outdoor temperature value section commonly used in the heating mode is 1.
And S5, determining the total capacity demand of the outdoor unit based on the total capacity demand of all the indoor units and the second capacity correction coefficient. The formula used in step S5 is:
Sout＝Sin·Rout；
wherein S isoutThe total capacity demand of the outdoor unit is as follows: w (i.e., "watts"); sinThe total capacity requirement of all indoor units which are started at present is as follows: w (i.e., "watts"); routThe second capacity correction coefficient of the outdoor unit.
And S6, determining the reference frequency of the compressor based on the total capacity demand of the outdoor unit and the refrigerating or heating capacity of the outdoor unit under the unit frequency of the compressor. The formula used in step S6 is:
F＝Sout/Pe；
wherein, F is the reference frequency of the compressor, and the unit is: hz (i.e., "hertz"); soutThe total capacity demand of the outdoor unit is as follows: w (i.e., "watts"); peThe unit is the refrigerating or heating capacity of the outdoor unit under the unit frequency of the compressor: w/Hz.
According to the method for determining the reference frequency of the compressor in the multi-split air conditioner, the total capacity demand of all the indoor units which are currently started is determined based on the rated capacity of each indoor unit, the set indoor temperature value, the current indoor temperature value and the first capacity correction coefficient, the total capacity demand of the outdoor unit is determined based on the total capacity demand of all the indoor units and the second capacity correction coefficient, and the reference frequency of the compressor is determined based on the total capacity demand of the outdoor unit and the refrigerating or heating capacity of the outdoor unit under the unit frequency of the compressor. Therefore, the factors such as the rated capacity of each indoor unit, the set indoor temperature value, the current indoor temperature value of the indoor unit, the current outdoor temperature value, the current working mode of the multi-split air conditioner and the like are fully considered when the reference frequency of the compressor is determined. Therefore, the determination result of the reference frequency of the compressor of the multi-split air conditioner can better meet the actual requirement, the multi-split air conditioner can achieve the target regulation effect in a short time, the multi-split air conditioner can operate more stably, the noise is reduced, the electric energy is saved, and the refrigerating or heating effect of the multi-split air conditioner is ensured.
In addition, according to the method for determining a reference frequency of a compressor in a multi-split air conditioner of the present embodiment, the first capacity correction coefficient of each indoor unit is determined based on a first mapping relationship between the predetermined first capacity correction coefficient of the indoor unit and the set indoor temperature value, and the current indoor temperature value in the operation mode, and the second capacity correction coefficient of the outdoor unit is determined based on a second mapping relationship between the predetermined second capacity correction coefficient of the outdoor unit and the current outdoor temperature value in the operation mode. Therefore, by determining the first capacity correction coefficient and the second capacity correction parameter, the difficulty level of adjusting the current indoor temperature value of the indoor unit to the set indoor temperature value or the change condition of the operating frequency of the compressor in the multi-split air conditioner in the subsequent working process is considered under various conditions of different working modes, different outdoor temperature values, different current indoor temperature values of the indoor unit and different set indoor temperature values of the multi-split air conditioner. Therefore, the multi-split air conditioner is further ensured to achieve the target adjusting effect in a short time, the multi-split air conditioner can operate more stably, noise is reduced, electric energy is saved, and the refrigerating or heating effect of the multi-split air conditioner is further ensured.
It is understood that although the first mapping relationship and the second mapping relationship are expressed by tables in the embodiment, the expression manner of the first mapping relationship and the second mapping relationship is not constant, and those skilled in the art can adjust them as required to adapt to specific application situations without departing from the principle of the present invention. For example, the first mapping relationship and the second mapping relationship of the present embodiment may also be represented by a form of a multivariate function.
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 change the order of the above steps without departing from the basic principle of the present invention, and the modified technical solution does not change the basic concept of the present invention and thus falls into the protection scope of the present invention. For example, the rated capacity of each currently started indoor unit, the set indoor temperature value, the current indoor temperature value at which the indoor unit is located, the current outdoor temperature value, and the current working mode of the multi-split air conditioner may be obtained simultaneously or sequentially.
It should be understood by those skilled in the art that the method for determining the reference frequency of the compressor in the multi-split 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.
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 method for determining a reference frequency of a compressor in a multi-split air conditioner, the multi-split air conditioner comprising an outdoor unit and a plurality of indoor units, the method comprising:
acquiring the rated capacity of each currently started indoor unit, a set indoor temperature value, a current indoor temperature value of the indoor unit, a current outdoor temperature value and a current working mode of the multi-split air conditioner; the working modes comprise a cooling mode and a heating mode;
determining a first capacity correction coefficient of each indoor unit based on a first capacity correction coefficient of a predetermined indoor unit, the set indoor temperature value and a first mapping relation of the current indoor temperature value in the working mode;
determining the total capacity requirement of all currently started indoor units based on the rated capacity of each indoor unit, the set indoor temperature value, the current indoor temperature value and the first capacity correction coefficient;
determining a second capacity correction coefficient of the outdoor unit based on a second mapping relation between a predetermined second capacity correction coefficient of the outdoor unit and the current outdoor temperature value in the working mode;
determining the capacity demand total amount of the outdoor unit based on the capacity demand total amount of all the indoor units and the second capacity correction coefficient;
and determining the reference frequency of the compressor based on the total capacity demand of the outdoor unit and the refrigerating or heating capacity of the outdoor unit at the unit frequency of the compressor.
2. The method according to claim 1, wherein the step of determining the total capacity demand of all indoor units currently on based on the rated capacity of each indoor unit, the set indoor temperature value, the current indoor temperature value, and the first capacity correction factor uses the formula:
Sin＝∑[(|Tc–Ts|+ΔD)·Rin·Hp]；
wherein S isinThe total capacity requirement of all indoor units which are started at present is as follows: w; t iscThe unit of the current indoor temperature value of the indoor unit is as follows: DEG C; t issThe indoor temperature value is set for the indoor unit, and the unit is as follows: DEG C; and delta D is the capacity requirement stop allowable temperature difference set when the indoor unit leaves a factory or is installed, and the unit is as follows: DEG C; rinA first capacity correction factor for the indoor unit; hpThe rated capacity of the indoor unit.
3. The method of claim 1, wherein the step of determining the total capacity demand of the outdoor unit based on the total capacity demand of all indoor units and the second capacity correction factor comprises the following formula:
Sout＝Sin·Rout；
wherein S isoutThe total capacity demand of the outdoor unit is as follows: w; sinThe total capacity requirement of all indoor units which are started at present is as follows: w; routThe second capacity correction coefficient of the outdoor unit.
4. The method of claim 1, wherein the step of determining the reference frequency of the compressor based on the total capacity demand of the outdoor unit and the cooling or heating capacity of the outdoor unit per unit frequency of the compressor comprises:
F＝Sout/Pe；
wherein, F is the reference frequency of the compressor, and the unit is: hz; soutThe total capacity demand of the outdoor unit is as follows: w; peFor outdoor unit in compressorThe refrigerating or heating capacity at the bit frequency is given by the unit: w/Hz.
5. The method according to claim 1, wherein the step of determining the first capacity correction coefficient for each indoor unit based on a first mapping relationship between a predetermined first capacity correction coefficient for the indoor unit and the set indoor temperature value and the current indoor temperature value in the operating mode comprises:
determining a first mapping relation in the working mode as a selected first mapping relation based on the working mode;
determining a set indoor temperature value interval in which the set indoor temperature value is located as a selected set indoor temperature value interval from among a plurality of consecutive set indoor temperature value intervals which are divided in advance by the selected first mapping relation;
calculating an absolute value of a temperature difference between the set indoor temperature value and the current indoor temperature value;
determining a temperature difference absolute value interval in which the temperature difference absolute value is located as a selected temperature difference absolute value interval in a plurality of continuous temperature difference absolute value intervals which are divided in advance of the selected first mapping relation;
and determining a first capacity correction coefficient of the indoor unit in the selected first mapping relation based on the selected set indoor temperature value interval and the selected temperature difference absolute value interval.
6. The determination method according to claim 5, wherein in the selected first mapping relationship in the cooling mode, for the same set indoor temperature value interval, the first capacity correction coefficient gradually increases when the different temperature difference absolute value intervals are arranged in the order of the temperature difference absolute values from small to large;
in the selected first mapping relation in the cooling mode, aiming at the same absolute temperature difference value interval, when different set indoor temperature value intervals are arranged according to the sequence of the set indoor temperature values from small to large, the first capacity correction coefficient is gradually reduced;
in the selected first mapping relation in the cooling mode, a first capacity correction coefficient of the indoor unit, which is determined based on the set indoor temperature value interval commonly used in the cooling mode and the minimum absolute temperature difference value interval, is 1.
7. The determination method according to claim 5, wherein in the selected first mapping relationship in the heating mode, for the same set indoor temperature value interval, the first capacity correction coefficient gradually increases when the different temperature difference absolute value intervals are arranged in the order of the temperature difference absolute values from small to large;
in the selected first mapping relation in the heating mode, for the same absolute temperature difference value interval, the first capacity correction coefficient is gradually increased when different set indoor temperature value intervals are arranged according to the sequence of the set indoor temperature values from small to large;
in the selected first mapping relation in the heating mode, a first capacity correction coefficient of the indoor unit, which is determined based on the set indoor temperature value section commonly used in the heating mode and the minimum absolute temperature difference value section, is 1.
8. The method of claim 1, wherein the step of determining the second capacity correction factor of the outdoor unit based on a predetermined second mapping relationship between the second capacity correction factor of the outdoor unit and the current outdoor temperature value in the operation mode comprises:
determining a second mapping relation in the working mode as a selected second mapping relation based on the working mode;
determining a current outdoor temperature value interval in which the current outdoor temperature value is located as a selected current outdoor temperature value interval in a plurality of pre-divided current outdoor temperature value intervals of the selected second mapping relationship;
and determining a second capacity correction coefficient of the outdoor unit in the selected second mapping relation based on the selected current outdoor temperature value interval.
9. The determination method according to claim 8, wherein in the selected second mapping relationship in the cooling mode, the second capability correction coefficient gradually increases when the different current outdoor temperature value intervals are arranged in the order from small to large of the current outdoor temperature values;
in the selected second mapping relationship in the cooling mode, a second capacity correction coefficient of the outdoor unit determined based on the current outdoor temperature value interval commonly used in the cooling mode is 1.
10. The determination method according to claim 8, wherein in the selected second mapping relationship in the heating mode, the second capability correction coefficient gradually increases when different current outdoor temperature value intervals are arranged in descending order of the current outdoor temperature values;
in the selected second mapping relationship in the heating mode, a second capacity correction coefficient of the outdoor unit, which is determined based on the current outdoor temperature value section that is commonly used in the heating mode, is 1.
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| PCT/CN2021/100009 WO2021233469A1 (en) | 2020-09-29 | 2021-06-15 | Method for determining reference frequency of compressor in multi-split air conditioner |
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| CN113531859A (en) * | 2021-06-22 | 2021-10-22 | 青岛海尔空调器有限总公司 | Control method and device for air conditioner and air conditioner |
| WO2021233469A1 (en) * | 2020-09-29 | 2021-11-25 | 青岛海尔空调电子有限公司 | Method for determining reference frequency of compressor in multi-split air conditioner |
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| CN115111825A (en) * | 2022-06-20 | 2022-09-27 | 青岛海信日立空调系统有限公司 | Method and device for determining running frequency of compressor |
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