CN117190409A - Method and device for controlling heat of multi-split air conditioner and multi-split air conditioner - Google Patents
Method and device for controlling heat of multi-split air conditioner and multi-split air conditioner Download PDFInfo
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Abstract
The application relates to the technical field of intelligent household appliances, and discloses a method for controlling heat of a multi-split air conditioner, wherein the multi-split air conditioner comprises a plurality of indoor units connected in parallel, and the method comprises the following steps: responding to a heating instruction of an air conditioner, and determining an initial target frequency of a compressor according to information of an indoor unit and indoor and outdoor temperature information; controlling an initial target frequency of operation of the compressor; the information of the indoor unit comprises an installation characteristic coefficient of the indoor unit, rated output power of the indoor unit when the indoor unit is started and rated output power of the indoor unit when the indoor unit is shut down/standby. According to the method, the installation characteristic coefficient of the indoor unit is introduced, so that the initial capacity requirement of the compressor is more similar to the actual heating requirement of a user, the control precision of the compressor is further improved, and the running of an air conditioning system is more stable and energy-saving. The application also discloses a device for controlling the heat of the multi-split air conditioner and the multi-split air conditioner.
Description
Technical Field
The application relates to the technical field of intelligent household appliances, in particular to a method and a device for controlling heat of a multi-split air conditioner and the multi-split air conditioner.
Background
The multi-split air conditioner is an air conditioning system with a plurality of indoor units connected in parallel, and is a complex air conditioning system running under a variable load working condition. Along with the advocacy of energy saving, emission reduction and green building, how to operate the multi-split air conditioner in the most energy-saving state is a technical problem to be solved currently.
In the related art, a method for determining a reference frequency of a compressor in a multi-split air conditioner is disclosed, comprising the following steps: acquiring rated capacity of each indoor unit which is currently started, setting an indoor temperature value, a current indoor temperature value of the indoor unit, a current outdoor temperature value and a working mode of a current multi-split air conditioner; the working modes comprise a refrigerating mode and a heating mode; determining a first capacity correction coefficient of each indoor unit based on a first mapping relation between a preset first capacity correction coefficient of each indoor unit, the set indoor temperature value and the current indoor temperature value in the working mode; determining the capacity demand total amount of all indoor units which are currently opened based on 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; the reference frequency of the compressor is determined based on the capacity demand amount of the outdoor unit and the cooling or heating capacity of the outdoor unit at the unit frequency of the compressor.
In the process of implementing the embodiments of the present disclosure, it is found that at least the following problems exist in the related art:
the difference between the total capacity requirement and the actual requirement of the outdoor unit is larger, so that the running fluctuation of the air conditioning system is larger, and the energy is wasted.
Disclosure of Invention
The following presents a simplified summary in order to provide a basic understanding of some aspects of the disclosed embodiments. This summary is not an extensive overview, and is intended to neither identify key/critical elements nor delineate the scope of such embodiments, but is intended as a prelude to the more detailed description that follows.
The embodiment of the disclosure provides a method and a device for controlling heat of a multi-split air conditioner and the multi-split air conditioner, which can realize stable operation of the multi-split air conditioner and energy conservation.
In some embodiments, the method comprises: responding to a heating instruction of an air conditioner, and determining an initial target frequency of a compressor according to information of an indoor unit and indoor and outdoor temperature information; controlling an initial target frequency of operation of the compressor; the information of the indoor unit comprises an installation characteristic coefficient of the indoor unit, rated output power of the indoor unit when the indoor unit is started and rated output power of the indoor unit when the indoor unit is shut down/standby.
In some embodiments, the apparatus comprises: a processor and a memory storing program instructions configured to perform a method for multi-split air-conditioning thermal control as described above when the program instructions are executed.
In some embodiments, the storage medium stores program instructions that, when executed, perform a method for multi-split air conditioning thermal control as previously described.
The method and the device for controlling the heat of the multi-split air conditioner provided by the embodiment of the disclosure can realize the following technical effects:
in an embodiment of the present disclosure, an air conditioner includes a plurality of indoor units. When the air conditioner is in operation heating, the initial target frequency of the compressor is determined by combining rated output power of the startup indoor unit, rated output power of the shutdown/standby indoor unit, installation characteristic coefficient of the indoor unit and indoor and outdoor environment temperature information. By introducing the installation characteristic coefficient of the indoor unit, the initial capacity requirement of the compressor is more similar to the actual heating requirement of a user. Thereby improving the control precision of the compressor and enabling the running of the air conditioning system to be more stable and energy-saving.
The foregoing general description and the following description are exemplary and explanatory only and are not restrictive of the application.
Drawings
One or more embodiments are illustrated by way of example and not limitation in the figures of the accompanying drawings, in which like references indicate similar elements, and in which like reference numerals refer to similar elements, and in which:
fig. 1 is a schematic diagram of a method for air conditioning thermal control of a multi-split air conditioner provided in an embodiment of the present disclosure;
FIG. 2 is a schematic illustration of a method of determining an initial target frequency for a compressor in a method provided by an embodiment of the present disclosure;
FIG. 3 is a schematic diagram of another method for multi-split air conditioning thermal control provided by an embodiment of the present disclosure;
FIG. 4 is a schematic illustration of a method of modifying a target condensing temperature of a compressor in a method provided by an embodiment of the present disclosure;
FIG. 5 is a schematic diagram of another method for multi-split air conditioning thermal control provided by an embodiment of the present disclosure;
FIG. 6 is a schematic diagram of another method for multi-split air conditioning thermal control provided by an embodiment of the present disclosure;
FIG. 7 is a schematic diagram of a variation curve of a dynamic target liquid pipe temperature in the method provided by the embodiment of the disclosure;
FIG. 8 is a schematic diagram of another method for multi-split air conditioning thermal control provided by an embodiment of the present disclosure;
fig. 9 is a schematic diagram of an apparatus for air conditioning thermal control of a multi-split air conditioner according to an embodiment of the present disclosure.
Detailed Description
So that the manner in which the features and techniques of the disclosed embodiments can be understood in more detail, a more particular description of the embodiments of the disclosure, briefly summarized below, may be had by reference to the appended drawings, which are not intended to be limiting of the embodiments of the disclosure. In the following description of the technology, for purposes of explanation, numerous details are set forth in order to provide a thorough understanding of the disclosed embodiments. However, one or more embodiments may still be practiced without these details. In other instances, well-known structures and devices may be shown simplified in order to simplify the drawing.
The terms first, second and the like in the description and in the claims of the embodiments of the disclosure and in the above-described figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate in order to describe embodiments of the present disclosure. Furthermore, the terms "comprise" and "have," as well as any variations thereof, are intended to cover a non-exclusive inclusion.
The term "plurality" means two or more, unless otherwise indicated.
In the embodiment of the present disclosure, the character "/" indicates that the front and rear objects are an or relationship. For example, A/B represents: a or B.
The term "and/or" is an associative relationship that describes an object, meaning that there may be three relationships. For example, a and/or B, represent: a or B, or, A and B.
The term "corresponding" may refer to an association or binding relationship, and the correspondence between a and B refers to an association or binding relationship between a and B.
Referring to fig. 1, an embodiment of the present disclosure provides a method for controlling heat of a multi-split air conditioner, including:
s101, the processor responds to a heating instruction of the air conditioner, and determines an initial target frequency of the compressor according to information of the indoor unit and indoor and outdoor temperature information. The information of the indoor unit comprises an installation characteristic coefficient of the indoor unit, rated output power of the indoor unit when the indoor unit is started and rated output power of the indoor unit when the indoor unit is shut down/standby.
S102, the processor controls the compressor to operate at an initial target frequency.
Here, the air conditioner is turned on to operate the heating mode, and determines an indoor unit to be turned on and an indoor unit to be standby/turned off among the indoor units. Because the indoor units are multiple, the indoor units for starting heating may be one or a plurality of indoor units, or even all indoor units. It is necessary to determine the state of the indoor units first and obtain information of each indoor unit at the same time. The information of the indoor unit comprises an installation characteristic coefficient of the indoor unit and rated output power of the indoor unit. The installation characteristic coefficient of the indoor unit refers to the influence of the installation environment on the performance of the indoor unit after the indoor unit is installed. For example, the indoor unit installation environment causes more heat loss of the indoor unit. In this case, the influence of the installation environment of the indoor unit on the heat of the indoor unit is represented by the installation characteristic coefficient. The rated output power of the indoor unit is also referred to as the capacity of the indoor unit. When the multi-split air conditioner operates in a cooling or heating mode, part of refrigerant remains in the condenser. In the heating mode, the indoor heat exchanger is a condenser. When one or a plurality of indoor units are in a shutdown state or a standby state, the refrigerant can be reserved in the heat exchanger. That is, the high-temperature and high-pressure refrigerant discharged from the compressor may generate a loss in the indoor unit that is turned off or is standby, so that the rated output power of the indoor unit that is turned on, turned off/standby needs to be considered in the embodiments of the present disclosure.
The initial target frequency of the compressor reflects the initial heating capacity requirement of the compressor. The initial heating capacity requirement of the compressor depends on the information of the indoor unit and the indoor and outdoor temperature information. The installation characteristic coefficient of the indoor unit affects the heat of the indoor unit as described above. I.e. the actual output power of the indoor unit. In the case where the output power of the indoor unit cannot accurately embody the user's demand, the initial heating capacity demand of the compressor is also affected. And further, the initial heating capacity of the compressor is different from the actual demand of a user, so that the fluctuation of the air conditioning system is large, and the energy consumption is generated. Therefore, in the embodiment of the disclosure, the installation characteristic coefficient is introduced to improve the matching degree of the initial heating capacity of the compressor and the actual demand of the user. Therefore, the control precision of the compressor is improved, the energy loss of an air conditioning system can be avoided, and the energy saving is facilitated.
By adopting the method for controlling the heat of the multi-split air conditioner, when the air conditioner is used for heating in operation, the initial target frequency of the compressor is determined by combining the rated output power of the startup indoor unit, the rated output power of the shutdown/standby indoor unit, the installation characteristic coefficient of the indoor unit and the indoor and outdoor environment temperature information. By introducing the installation characteristic coefficient of the indoor unit, the initial capacity requirement of the compressor is more similar to the actual heating requirement of a user. Thereby improving the control precision of the compressor and enabling the running of the air conditioning system to be more stable and energy-saving.
Optionally, referring to fig. 2, in step S101, the processor determines an initial target frequency of the compressor according to information of a startup indoor unit and indoor and outdoor temperature information, including:
s111, the processor determines target output power of each starting indoor unit according to indoor and outdoor environment temperature information, installation characteristic coefficients and rated output power of each starting indoor unit.
And S112, the processor determines the loss power of each shutdown/standby indoor unit according to the outdoor environment temperature information, the installation characteristic coefficient and the rated output power of each shutdown/standby indoor unit.
S113, the processor takes the sum of each target output power and each loss power as the initial output power of the compressor.
And S114, the processor determines an initial target frequency of the compressor according to the relation between the output power of the compressor and the operating frequency.
Here, the target output power of each startup indoor unit is determined based on the rated output power of each startup indoor unit, the rated output power of each shutdown or standby indoor unit, the installation characteristic coefficient, and the indoor and outdoor environment temperature information. The indoor environment temperature information comprises an indoor current temperature and a set temperature. Specifically, the larger the difference between the indoor current temperature and the set temperature, the larger the target output power. The higher the outdoor ambient temperature, the less the target output power. The installation characteristic coefficient can be obtained through a test after the indoor unit is installed, and in general, the larger the heat loss is, the larger the installation characteristic coefficient is. Thus, the output power of the indoor unit is upwardly corrected, so that the output power of the indoor unit can meet the requirements of users. The target output power of each indoor unit can be determined by combining the parameters. The power loss of the indoor unit in the shutdown/standby state depends on the outdoor environment temperature and the corresponding installation characteristic coefficient of the indoor unit. The lower the outdoor ambient temperature, the greater the power loss of the indoor unit. The larger the installation characteristic coefficient is, the larger the power loss of the indoor unit is corrected upwards. By combining the two parameters, the power loss of each shutdown/standby indoor unit can be determined.
Further, the target output power of each starting indoor unit and the loss power of each shutdown/standby indoor unit are accumulated, so that the total heating demand of the multi-split air conditioner can be obtained, and the initial output power of the compressor can be obtained. In the embodiment of the disclosure, the number of the air conditioner outdoor units is one, so the total indoor heating demand is the initial output power of the compressor. In some embodiments, the air conditioner outdoor unit includes a plurality of compressors. At this time, the number of starts of the compressors and the output power of the start-up compressors may be determined based on the total amount of heating demand. For example: if the total indoor heating demand is less than 70% of the output load capacity of all compressors, the starting number of the compressors is one; the compressor bears the total indoor heating requirement. If the total indoor heating demand is greater than or equal to 70% of the output load capacity of all the compressors, the number of compressors started is two or more, and each compressor can be used for evenly distributing or proportionally distributing the total indoor heating demand. After determining the initial output power of the compressor, an initial target frequency of the compressor may be determined according to a correspondence between the output power and the operating frequency. Thus, the frequency of the compressor is comprehensively determined by combining factors influencing indoor heating requirements. The initial output load capacity of the compressor is matched with the actual demands of users, the running stability of the air conditioning system is ensured, and the energy conservation is facilitated.
Alternatively, the installation feature coefficients of the indoor units in step S101 are determined by:
and the processor acquires the difference value between the inlet temperature of each indoor unit heat exchanger and the outlet temperature of the outdoor unit heat exchanger under the condition that the multi-split air conditioner is installed for heating and test operation.
The larger the difference value is, the larger the installation characteristic coefficient of the corresponding indoor unit is.
Here, in the heating mode, the inlet temperature of each indoor unit heat exchanger and the outlet temperature of the outdoor unit heat exchanger are detected by the temperature sensor. The temperature difference is calculated, the larger the difference, the more heat loss. That is, the installation environment of the indoor unit is poor, and thus the corresponding indoor unit installation characteristic coefficient is larger. To correct the output power of the indoor unit. The inlet temperature of the indoor unit heat exchanger refers to the temperature of a liquid pipe at the inlet of the indoor unit heat exchanger.
Specifically, the processor may calculate the installation feature coefficients of each indoor unit by the following formula:
l i,n ＝1+(TG-T s,n )/T sm
wherein l i,n And installing a characteristic coefficient for the nth indoor unit, wherein i is the abbreviation of in and represents the indoor space. T (T) s,n The temperature of the air pipe of the nth indoor unit; TG is the outdoor heat exchanger outlet temperature. T (T) sm Is the average value of the liquid pipe temperature of all indoor units. Here, the difference between the temperature of each indoor unit liquid pipe and the temperature of the outlet of the outdoor heat exchanger is calculated, and the average ratio of the difference to the temperature of each indoor unit liquid pipe is calculated. Compared with the difference value, the ratio can reflect the relative value of the heat loss of the indoor unit in the air conditioning system more accurately.
Optionally, in step S101, the processor determines an initial target frequency of the compressor according to information of a startup indoor unit and indoor and outdoor temperature information, including:
processor computation
The processor determines an initial target frequency corresponding to the initial output power of the compressor according to the relationship between the output power of the compressor and the operating frequency.
Wherein Q is h K is the initial output power of the compressor h For correcting coefficient, k of outdoor environment temperature i,j The indoor environment temperature correction coefficient, l for the j-th indoor unit i,j And the installation characteristic coefficient of the j-th indoor unit is started. k (k) h According to the outdoor environment temperature; the higher the outdoor ambient temperature, k h The larger the value of (2). k (k) i,j According to the difference between the indoor environment temperature of the corresponding indoor unit and the user set temperature. The greater the difference between the two, k i,j The larger the value of (2). The smaller the difference between the two is, k i,j The smaller the value of (c). Q (Q) i,j And the rated output power of the j-th indoor unit is started. l (L) i,k And the installation characteristic coefficient of the kth shutdown/standby indoor unit. Q (Q) i,k And the rated output power of the kth indoor unit is started. The sum of k and j is equal to the total number n of indoor units.
As shown in conjunction with fig. 3, an embodiment of the present disclosure provides another method for air conditioning thermal control of a multi-split air conditioner, including:
s101, the processor responds to a heating instruction of the air conditioner, and determines an initial target frequency of the compressor according to information of the indoor unit and indoor and outdoor temperature information. The information of the indoor unit comprises an installation characteristic coefficient of the indoor unit, rated output power of the indoor unit when the indoor unit is started and rated output power of the indoor unit when the indoor unit is shut down/standby.
S102, the processor controls the compressor to operate at an initial target frequency.
S203, the processor acquires a target condensing temperature of the compressor; and correcting the target condensing temperature of the compressor according to the indoor temperature change condition of each starting indoor unit.
Here, the target condensing temperature of the compressor is a set value. Typically, it is determined from the outdoor ambient temperature. If the outdoor ambient temperature is lower than-6 ℃, the target condensation temperature (saturation temperature) is 43 ℃. When the outdoor ambient temperature is higher than 4 ℃, the target condensation temperature is 48 ℃. When the outdoor ambient temperature is between-6 ℃ and 4 ℃, the target condensation temperature is between 43 ℃ and 48 ℃, and is positively correlated with the outdoor ambient temperature. The above examples do not impose a mandatory requirement on the temperature values and may fluctuate appropriately.
By detecting the condensing pressure of the compressor, the actual condensing temperature of the compressor is obtained. The condensing pressure has a corresponding relationship with the condensing temperature. Generally, the operating frequency of the compressor is reduced when the actual condensing temperature of the compressor is greater than the target condensing temperature. And when the actual condensing temperature of the compressor is smaller than the target condensing temperature, the operating frequency of the compressor is increased. However, the target value of the condensing temperature is not suitable for each indoor unit to be started up due to the difference between the ambient temperature of each indoor unit and the set temperature. Based on the above-mentioned problems, the embodiment of the present disclosure corrects the target condensing temperature of the compressor according to the indoor temperature change condition. As can be appreciated, as the air conditioner operates, the indoor heating demand load of the indoor unit is turned on gradually becomes smaller. The output capacity of the compressor is matched with the load condition of the indoor unit through the dynamic correction of the target condensation temperature. Which helps to fine tune the output capacity of the compressor according to the indoor temperature variation. Thereby realizing energy saving of the air conditioning system.
Optionally, in step S203, the processor corrects the target condensation temperature of the compressor according to the indoor temperature change condition, including:
s231, the processor calculates the temperature difference and the temperature difference change rate of each startup indoor unit.
S232, the processor determines the temperature difference correction coefficient according to the relationship among the temperature difference, the temperature difference change rate and the temperature difference correction coefficient.
S233, the processor calculates the corrected target condensation temperature according to the temperature difference correction coefficient and the target condensation temperature.
Wherein T is co ’＝[T co ×Σξ j ]÷j；
T co ' is the corrected target condensing temperature, T co For target condensing temperature, ζ j And the temperature difference correction coefficient is the temperature difference correction coefficient of the j-th indoor unit, and j is the number of the indoor units.
Here, the temperature difference of the indoor unit when the indoor unit is started refers to the difference between the current indoor temperature and the set temperature, and the temperature difference change rate refers to the change rate of the difference. The indoor current temperature of the indoor unit can be obtained by detecting the return air temperature of the air conditioner or by detecting a temperature sensor arranged indoors. For example t ai,j The return air temperature t of the j-th indoor unit set,j The set temperature of the indoor unit of the j-th startup indoor unit is set. The difference delta t j ＝t set,j -t ai,j The method comprises the steps of carrying out a first treatment on the surface of the Rate of change of temperature difference epsilon=Δt j (n)-Δt j (n-1), n indicating the number of times the difference is calculated. Based on the temperature difference and the temperature difference change rate of each starting indoor unit, determining the temperature difference correction coefficient xi of the starting indoor unit j . The larger the temperature difference is, the larger the volatilization capacity of the corresponding indoor unit is. The larger the temperature difference change rate is, the faster the indoor temperature of the corresponding starting indoor machine tends to the temperature set by the user. Thus, by these two parameters, the temperature difference correction coefficient is determined. The larger the temperature difference, the larger the temperature difference correction coefficient. The larger the temperature difference change rate is, the larger the temperature difference correction coefficient is. Further, temperature difference correction coefficients of all the starting indoor units are obtained, and target condensing temperature of the compressor is corrected based on the temperature difference correction coefficients. Thus, the target condensing temperature of the compressor is more similar to the real-time load demand of the indoor unit.
Optionally, in step S232, the processor determines a temperature difference correction coefficient according to the relationship between the temperature difference, the temperature difference change rate and the temperature difference correction coefficient, including:
the processor acquires the temperature difference correction coefficient by adopting a fuzzy control table look-up mode based on a relation table of the temperature difference, the temperature difference change rate and the temperature difference correction coefficient.
Specifically, the relationship is shown in Table 1. Wherein, the numerical distribution is gradually reduced from left to right and from top to bottom. I.e. upper left corner q 11 The numerical value of (2) is as high as 1.2, the lower right corner q 88 The value of (2) is at least as 0.6. As an example, at the difference Δt j Together with the rate of change of the temperature difference ε, q in Table 1 is determined 44 When not directly add q 44 As a temperature difference correction coefficient. But obtains the sum q by fuzzy control look-up table 44 Adjacent four values q 34 、q 43 、q 54 、q 45 . The average value of the four values is taken as a temperature difference correction coefficient, namely zeta j ＝(q 34 +q 43 +q 54 +q 45 )/4. Thus, the purpose of fine control can be achieved. When the values determined by the difference and the rate of change of the temperature difference are the side-most rows or columns in table 1, the adjacent values obtained by the fuzzy control lookup table are two or three.
TABLE 1
As shown in conjunction with fig. 5, an embodiment of the present disclosure provides another method for air conditioning thermal control of a multi-split air conditioner, including:
s101, the processor responds to a heating instruction of the air conditioner, and determines an initial target frequency of the compressor according to information of the indoor unit and indoor and outdoor temperature information. The information of the indoor unit comprises an installation characteristic coefficient of the indoor unit, rated output power of the indoor unit when the indoor unit is started and rated output power of the indoor unit when the indoor unit is shut down/standby.
S102, the processor controls the compressor to operate at an initial target frequency.
S303, the processor determines the dynamic target superheat degree of the heat exchanger of the outdoor unit according to the indoor temperature of each starting indoor unit.
S304, the processor adjusts the opening degree of the electronic expansion valve of the outdoor unit according to the dynamic target superheat degree.
The electronic expansion valve of the outdoor unit is usually adjusted according to the superheat degree of the outlet of the heat exchanger of the outdoor unit. In order to prevent the liquid return of the compressor and fully exert the heat exchange capability of the heat exchanger of the outdoor unit, the degree of superheat of the outlet is generally a fixed value such as SH =3K. However, in actual control, the indoor load is varied. The outdoor unit electronic expansion valve needs to be flexibly controlled so as to adjust the gas-liquid two-phase refrigerant in the heat exchanger of the outdoor unit. The flexible adjustment of the heat exchanger of the outdoor unit is realized to save energy. Specifically, the dynamic target superheat degree SH O ＝[j×SH Reference value of O ]Σζj; wherein, xi j For the temperature difference correction coefficient, the determination is described in detail above. SH Reference value of O For example, 3K for a set reference value. And then the size of the outdoor machine electronic expansion valve is adjusted through the dynamic target superheat degree. If the dynamic target superheat degree is reduced, the opening degree of the outdoor electronic expansion valve needs to be reduced. And if the dynamic target superheat degree is increased, the opening degree of the outdoor electronic expansion valve is increased. When the outdoor electronic expansion valve is regulated, a superheat threshold interval can be set. And adjusting the operation frequency of the compressor according to the relation between the dynamic target superheat degree and the superheat region threshold value interval. If the dynamic target superheat degree is smaller than the minimum value of the superheat degree threshold value interval, the zeta is indicated j Too large, the compressor has a risk of liquid back. The operating frequency of the compressor needs to be increased. When the superheat degree of the dynamic target is larger than the maximum value of the superheat degree threshold value interval, the zeta is indicated j Too small, the operating frequency of the compressor may be correspondingly reduced.
As shown in fig. 6, an embodiment of the present disclosure provides another method for air conditioning thermal control of a multi-split air conditioner, including:
s101, the processor responds to the refrigerating instruction of the air conditioner, and determines the initial target frequency of the compressor according to the information of the indoor unit and the indoor and outdoor temperature information. The information of the indoor unit comprises an installation characteristic coefficient of the indoor unit, rated output power of the indoor unit when the indoor unit is started and rated output power of the indoor unit when the indoor unit is shut down/standby.
S102, the processor controls the compressor to operate at an initial target frequency.
S403, the processor acquires the dynamic target liquid pipe temperature of each startup indoor unit; the dynamic target liquid pipe temperature is positively correlated with the difference value between the return air temperature and the set temperature of each starting indoor unit.
S404, the processor adjusts the opening of the electronic expansion valve of the corresponding startup indoor unit according to the dynamic target liquid pipe temperature.
In general, after the indoor units are started, the corresponding target liquid pipe temperature is a unified value of all the indoor units, so that each starting indoor unit cannot be adjusted according to the indoor load condition. When the indoor load is small, such as spring and autumn, the indoor unit is easy to be frequently started and shut down. And further, the indoor environment temperature fluctuation is larger, and the user experience is reduced. In contrast, the embodiment of the disclosure obtains the dynamic target liquid pipe temperature of each startup indoor unit; and the opening degree of the indoor machine electronic expansion valve is controlled by the dynamic target liquid pipe temperature. Here, the dynamic target liquid pipe temperature depends on the real-time temperature and the target temperature in the room. Generally, the closer the real-time indoor temperature is to the target temperature, the smaller the value of the dynamic target liquid pipe temperature is, and the electronic expansion valve needs to be closed. By reducing the flow of the refrigerant, the output load of the air conditioning system is reduced. Thus, the indoor unit can be prevented from being shut down due to the fact that the indoor unit enters a thermal shutdown state (namely, is thermally off) too early. And avoid the problem of large indoor temperature fluctuation caused by restarting (i.e. thermo on) the indoor unit and increased energy consumption caused by starting. The electronic expansion valve of the indoor unit is controlled by adopting the temperature of the dynamic target liquid pipe, so that the electronic expansion valve is more energy-saving and is also beneficial to maintaining the stability of the indoor temperature.
Specifically, the return air temperature of each indoor unit is detected according to a set detection period, and the difference delta t between the return air temperature and the set temperature is calculated based on the detection period i,j ＝t set,j -t in,j . In the adjacent calculation period, the smaller the difference value is, the dynamic target liquid tube temperature T ol,j The smaller the value of (c). The change rate of the difference value and the value of the dynamic target liquid tube temperature can be in a linear relationship, such as a curve 1 in fig. 7. In other words, the closer the indoor unit temperature is to the set temperature, the faster the value change of the dynamic target liquid pipe temperature becomes, as shown by curve 2 in fig. 7. Thus, compared with the curve 1, the curve 2 can realize fine control, and further saves more energy.
Referring to fig. 8, another method for controlling refrigeration of a multi-split air conditioner according to an embodiment of the present disclosure includes:
s101, the processor responds to the refrigerating instruction of the air conditioner, and determines the initial target frequency of the compressor according to the information of the indoor unit and the indoor and outdoor temperature information. The information of the indoor unit comprises an installation characteristic coefficient of the indoor unit, rated output power of the indoor unit when the indoor unit is started and rated output power of the indoor unit when the indoor unit is shut down/standby.
S102, the processor controls the compressor to operate at an initial target frequency.
S403, the processor acquires the dynamic target liquid pipe temperature of each startup indoor unit; the dynamic target liquid pipe temperature is positively correlated with the difference value between the return air temperature and the set temperature of each starting indoor unit.
S404, the processor adjusts the opening of the electronic expansion valve of the corresponding startup indoor unit according to the dynamic target liquid pipe temperature.
S505, the processor obtains the relative supercooling degree of each startup indoor unit.
And S506, the processor controls the electronic expansion valve of the shutdown/standby indoor unit to be closed under the condition that the relative supercooling degree of any one or more startup indoor units is greater than a first threshold value so as to recover the refrigerant.
S507, the processor controls the electronic expansion valve of the shutdown/standby indoor unit to be opened under the condition that the relative supercooling degree of any one startup indoor unit is smaller than a second threshold value so as to release the refrigerant.
Here, in the process of adjusting the electronic expansion valve of the indoor unit, there may be a relatively large or small relative supercooling degree of one or some indoor units. I.e. the total amount of circulating refrigerant of the air conditioning system is not optimal. In this case, it is necessary to adjust the electronic expansion valve of the shutdown/standby indoor unit to release or recover the refrigerant stored therein. Wherein the relative supercooling degree Sc i,j ＝Tc-T l,j The method comprises the steps of carrying out a first treatment on the surface of the Tc is condensation temperature corresponding to the detected pressure of the high-pressure sensor of the outdoor unit, tl and j are the temperature of the liquid pipe of the j-th indoor unit. Specifically, when the supercooling degree of each startup indoor unit is within a preset range, the electronic expansion valve of the shutdown/standby indoor unit is not regulated. The preset range can be set to [5,25 ]]. When the relative supercooling degree of at least one startup indoor unit is larger than a first threshold value (namely larger than 25), the electronic expansion valve of the shutdown/standby indoor unit is controlled to be closed so as to recover the refrigerant. Relative to any indoor unit when starting upAnd when the supercooling degree is smaller than a second threshold value (namely smaller than 5), controlling the electronic expansion valve of the shutdown/standby indoor unit to be opened. Thus, the total amount of circulating refrigerant in the system is optimized by controlling the electronic expansion valve in the shutdown/standby state. Therefore, the system power is optimal, and energy conservation is realized.
The embodiment of the disclosure provides a device for controlling heat of a multi-split air conditioner, which comprises a determining module and a control module. The determining module is configured to determine an initial target frequency of the compressor according to information of the indoor unit and indoor and outdoor temperature information in response to a heating instruction of the air conditioner; the control module is configured to control an initial target frequency of operation of the compressor; the information of the indoor unit comprises an installation characteristic coefficient of the indoor unit, rated output power of the indoor unit when the indoor unit is started and rated output power of the indoor unit when the indoor unit is shut down/standby.
By adopting the device for controlling the heat of the multi-split air conditioner, when the air conditioner is operated to heat, the initial target frequency of the compressor is determined by combining the rated output power of the startup indoor unit, the rated output power of the shutdown/standby indoor unit, the installation characteristic coefficient of the indoor unit and the indoor and outdoor environment temperature information. By introducing the installation characteristic coefficient of the indoor unit, the initial capacity requirement of the compressor is more similar to the actual heating requirement of a user. Thereby improving the control precision of the compressor and enabling the running of the air conditioning system to be more stable and energy-saving.
As shown in conjunction with fig. 9, an embodiment of the present disclosure provides an apparatus for multi-split air conditioning thermal control, including a processor (processor) 100 and a memory (memory) 101. Optionally, the apparatus may further comprise a communication interface (Communication Interface) 102 and a bus 103. The processor 100, the communication interface 102, and the memory 101 may communicate with each other via the bus 103. The communication interface 102 may be used for information transfer. Processor 100 may invoke logic instructions in memory 101 to perform the method for multi-split air conditioning refrigeration control of the above-described embodiments.
Further, the logic instructions in the memory 101 described above may be implemented in the form of software functional units and may be stored in a computer readable storage medium when sold or used as a stand alone product.
The memory 101 is a computer readable storage medium that can be used to store a software program, a computer executable program, such as program instructions/modules corresponding to the methods in the embodiments of the present disclosure. Processor 100 executes the program instructions/modules stored in memory 101 to perform functional applications and data processing, i.e., to implement the method for multi-split air conditioning thermal control in the above embodiments.
The memory 101 may include a storage program area and a storage data area, wherein the storage program area may store an operating system, at least one application program required for a function; the storage data area may store data created according to the use of the terminal device, etc. Further, the memory 101 may include a high-speed random access memory, and may also include a nonvolatile memory.
The embodiment of the disclosure provides a multi-split air conditioner, which comprises the device for controlling heat of the multi-split air conditioner.
The embodiment of the disclosure provides a storage medium storing computer executable instructions configured to perform the method for controlling heat of a multi-split air conditioner.
The storage medium may be a transitory computer readable storage medium or a non-transitory computer readable storage medium.
Embodiments of the present disclosure may be embodied in a software product stored on a storage medium, including one or more instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of a method according to embodiments of the present disclosure. And the aforementioned storage medium may be a non-transitory storage medium including: a plurality of 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, random Access Memory), a magnetic disk, or an optical disk, or a transitory storage medium.
The above description and the drawings illustrate embodiments of the disclosure sufficiently to enable those skilled in the art to practice them. Other embodiments may involve structural, logical, electrical, process, and other changes. The embodiments represent only possible variations. Individual components and functions are optional unless explicitly required, and the sequence of operations may vary. Portions and features of some embodiments may be included in, or substituted for, those of others. Moreover, the terminology used in the present application is for the purpose of describing embodiments only and is not intended to limit the claims. As used in the description of the embodiments and the claims, the singular forms "a," "an," and "the" (the) are intended to include the plural forms as well, unless the context clearly indicates otherwise. Similarly, the term "and/or" as used in this disclosure is meant to encompass any and all possible combinations of one or more of the associated listed. Furthermore, when used in the present disclosure, the terms "comprises," "comprising," and/or variations thereof, mean that the recited features, integers, steps, operations, elements, and/or components are present, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. Without further limitation, an element defined by the phrase "comprising one …" does not exclude the presence of other like elements in a process, method or apparatus comprising such elements. In this context, each embodiment may be described with emphasis on the differences from the other embodiments, and the same similar parts between the various embodiments may be referred to each other. For the methods, products, etc. disclosed in the embodiments, if they correspond to the method sections disclosed in the embodiments, the description of the method sections may be referred to for relevance.
Those of skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the solution. The skilled artisan may use different methods for each particular application to achieve the described functionality, but such implementation should not be considered to be beyond the scope of the embodiments of the present disclosure. It will be clearly understood by those skilled in the art that, for convenience and brevity of description, specific working procedures of the above-described systems, apparatuses and units may refer to corresponding procedures in the foregoing method embodiments, which are not repeated herein.
In the embodiments disclosed herein, the disclosed methods, articles of manufacture (including but not limited to devices, apparatuses, etc.) may be practiced in other ways. For example, the apparatus embodiments described above are merely illustrative, and for example, the division of the units may be merely a logical function division, and there may be additional divisions when actually implemented, for example, multiple units or components may be combined or integrated into another system, or some features may be omitted, or not performed. In addition, the coupling or direct coupling or communication connection shown or discussed with each other may be through some interface, device or unit indirect coupling or communication connection, which may be in electrical, mechanical or other form. The units described as separate units may or may not be physically separate, and units shown as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units may be selected according to actual needs to implement the present embodiment. In addition, each functional unit in the embodiments of the present disclosure may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit.
The flowcharts and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of systems, methods and computer program products according to embodiments of the present disclosure. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). In some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. In the description corresponding to the flowcharts and block diagrams in the figures, operations or steps corresponding to different blocks may also occur in different orders than that disclosed in the description, and sometimes no specific order exists between different operations or steps. For example, two consecutive operations or steps may actually be performed substantially in parallel, they may sometimes be performed in reverse order, which may be dependent on the functions involved. Each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware-based systems which perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.
Claims (10)
1. A method for controlling heat of a multi-split air conditioner, wherein the multi-split air conditioner comprises a plurality of indoor units connected in parallel, the method comprising:
responding to a heating instruction of an air conditioner, and determining an initial target frequency of a compressor according to information of an indoor unit and indoor and outdoor temperature information;
controlling an initial target frequency of operation of the compressor;
the information of the indoor unit comprises an installation characteristic coefficient of the indoor unit, rated output power of the indoor unit when the indoor unit is started and rated output power of the indoor unit when the indoor unit is shut down/standby.
2. The method of claim 1, wherein determining the initial target frequency of the compressor based on the information of the indoor unit and the indoor and outdoor temperature information comprises:
determining target output power of each starting indoor unit according to the indoor and outdoor environment temperature information, the installation characteristic coefficient and rated output power of each starting indoor unit;
determining the loss power of each shutdown/standby indoor unit according to the outdoor environment temperature information, the installation characteristic coefficient and the rated output power of each shutdown/standby indoor unit;
taking the sum of the target output power and the loss power as the initial output power of the compressor;
an initial target frequency of the compressor is determined based on the relationship of the compressor output power to the operating frequency.
3. The method according to claim 1, wherein the installation characteristic coefficient of the indoor unit is determined by:
under the condition of the multi-split air conditioner installation heating test operation, obtaining the difference value between the inlet temperature of each indoor unit heat exchanger and the outlet temperature of the outdoor unit heat exchanger;
the larger the difference value is, the larger the installation characteristic coefficient of the corresponding indoor unit is.
4. The method of claim 1, wherein after controlling the initial target frequency of operation of the compressor, further comprising:
obtaining a target condensing temperature of the compressor;
and correcting the target condensing temperature of the compressor according to the indoor temperature change condition of each starting indoor unit.
5. The method of claim 4, wherein correcting the target condensing temperature of the compressor according to the indoor temperature variation of each indoor unit for startup comprises:
calculating the indoor temperature difference and the temperature difference change rate of each starting indoor unit;
determining a temperature difference correction coefficient according to the relation among the temperature difference, the temperature difference change rate and the temperature difference correction coefficient;
calculating a corrected target condensing temperature according to the temperature difference correction coefficient and the target condensing temperature;
wherein T is co ’＝[T co ×Σξ j ]÷j；
T co ' is the corrected target condensing temperature, T co For target condensing temperature, ζ j For the j th boot roomTemperature difference correction coefficient of the machine.
6. The method of any one of claims 1 to 5, further comprising, after said controlling the initial target frequency of operation of the compressor:
determining the dynamic target superheat degree of the heat exchanger of the outdoor unit according to the indoor temperature change condition of each starting indoor unit;
and adjusting the opening degree of the electronic expansion valve of the outdoor unit according to the dynamic target superheat degree.
7. The method of any one of claims 1 to 5, further comprising, after said controlling the initial target frequency of operation of the compressor:
acquiring the temperature of a dynamic target liquid pipe of each starting indoor unit;
according to the dynamic target liquid pipe temperature, adjusting the opening of an electronic expansion valve of the corresponding startup indoor unit;
wherein, the dynamic target liquid pipe temperature is positively correlated with the difference value between the return air temperature and the set temperature of each startup indoor unit; the smaller the dynamic target liquid pipe temperature is, the smaller the opening degree of the electronic expansion valve is.
8. The method of claim 7, wherein adjusting the opening of the electronic expansion valve of the corresponding indoor unit comprises:
acquiring the relative supercooling degree of each starting indoor unit;
under the condition that the relative supercooling degree of any one or more starting indoor units is greater than a first threshold value, controlling an electronic expansion valve of the shutdown/standby indoor unit to be closed so as to recover the refrigerant;
and under the condition that the relative supercooling degree of any one of the indoor units is smaller than a second threshold value, controlling the electronic expansion valve of the indoor unit to be opened for releasing the refrigerant.
9. An apparatus for multi-split air-conditioning thermal control comprising a processor and a memory storing program instructions, wherein the processor is configured to perform the method for multi-split air-conditioning thermal control of any one of claims 1 to 8 when the program instructions are executed.
10. A multi-split air conditioner, comprising the device for controlling refrigeration of the multi-split air conditioner according to claim 9.
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| CN202210610552.9A CN117190409A (en) | 2022-05-31 | 2022-05-31 | Method and device for controlling heat of multi-split air conditioner and multi-split air conditioner |
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| CN202210610552.9A CN117190409A (en) | 2022-05-31 | 2022-05-31 | Method and device for controlling heat of multi-split air conditioner and multi-split air conditioner |
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