CN114484805B - Air conditioner temperature and humidity control method and air conditioner - Google Patents

Air conditioner temperature and humidity control method and air conditioner Download PDF

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Publication number
CN114484805B
CN114484805B CN202210176959.5A CN202210176959A CN114484805B CN 114484805 B CN114484805 B CN 114484805B CN 202210176959 A CN202210176959 A CN 202210176959A CN 114484805 B CN114484805 B CN 114484805B
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temperature
humidity
air conditioner
time
difference
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CN114484805A (en
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江世恒
李丽霞
谢沅
刘珊珊
宋美琪
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Gree Electric Appliances Inc of Zhuhai
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Gree Electric Appliances Inc of Zhuhai
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
    • F24F11/63—Electronic processing
    • F24F11/64—Electronic processing using pre-stored data
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
    • F24F11/63—Electronic processing
    • F24F11/65—Electronic processing for selecting an operating mode
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/70—Control systems characterised by their outputs; Constructional details thereof
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2110/00—Control inputs relating to air properties
    • F24F2110/10—Temperature
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2110/00—Control inputs relating to air properties
    • F24F2110/20—Humidity
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
    • Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating

Abstract

The invention belongs to the field of air conditioners, and particularly relates to an air conditioner temperature and humidity control method and an air conditioner, wherein the control method comprises the following steps: acquiring real-time temperature and real-time humidity of an indoor environment, and user set temperature and user set humidity in a refrigeration mode; calculating a temperature difference delta T according to the real-time temperature and the user set temperature, and judging whether the temperature difference delta T is in a set temperature difference range or not; when the temperature difference delta T is within a set temperature difference range, controlling the air conditioner to enter a temperature and humidity linkage control mode; in the temperature and humidity linkage control mode, the temperature difference delta T and the unit temperature change time T are used T To determine whether to enter humidity regulation; when the air conditioner enters humidity regulation, the humidity difference delta R is calculated according to the real-time humidity and the humidity set by the user, and the unit humidity change time t is calculated according to the humidity difference delta R R And inner tube temperature T Pipe To determine a control strategy of the air conditioner. The control method provided by the invention can be used for accurately controlling the temperature and the humidity, so that the temperature and the humidity fluctuate within a set range in a small range, and the environmental comfort is improved.

Description

Air conditioner temperature and humidity control method and air conditioner
Technical Field
The invention belongs to the field of air conditioners, and particularly relates to an air conditioner temperature and humidity control method and an air conditioner.
Background
With the continuous improvement of living standard, the requirement of people on the comfort of the household air conditioner is higher and higher, and the comfort is mainly the reasonable combination of temperature, humidity and wind speed. The traditional dehumidification function is mainly that when refrigerating, the surface temperature of the indoor heat exchanger is lower than the environmental dew point temperature, and water vapor in the air is condensed when meeting cold on the surface of the heat exchanger, so that the moisture in the air is continuously separated out, and the purpose of dehumidification is achieved. The common household air conditioner is not provided with any heating device, the humidity range is difficult to adjust in the refrigeration process, and the control parameters need to be corrected through logic judgment of heat and humidity loads. Moreover, due to the variable environment, relevant choices are needed when the control is carried out, and the temperature reaching the target is taken as a primary target.
The present invention has been made in view of this situation.
Disclosure of Invention
The technical problem to be solved by the invention is to overcome the defects of the prior art and provide a control method and an air conditioner which can simultaneously and accurately control the temperature and the humidity in a refrigeration mode.
In order to solve the technical problem, the invention provides an air conditioner temperature and humidity control method, wherein the air conditioner is provided with a temperature and humidity linkage control mode, and the control method comprises the following steps:
acquiring real-time temperature and real-time humidity of an indoor environment, and user set temperature and user set humidity in a refrigeration mode;
calculating the temperature difference T according to the real-time temperature and the user set temperature, and judging whether the temperature difference T is in the set temperature range;
when the temperature difference T is within the set temperature difference range, controlling the air conditioner to enter a temperature and humidity linkage control mode; in the temperature and humidity linkage control mode, the temperature is controlled according to the temperature difference T and the unit temperature change time T T To determine whether to enter humidity regulation and control and the unit temperature change time t T = temperature difference per unit time/unit time; when the air conditioner enters the humidity control, the humidity difference R is calculated according to the real-time humidity and the humidity set by the user, and the unit humidity changes for a time t according to the humidity difference R R And inner tube temperature T Pipe To determine the control strategy of the air conditioner, unit humidity change time t R = unit time/humidity difference per unit time.
Further optionally, in the temperature and humidity linkage control mode, the temperature is Δ T according to the temperature difference and the unit temperature change time T T To determine whether to enter humidity regulation, including
Judging whether the temperature difference T meets: Δ T > 0; if Δ T >0, according to the unit temperature change time T T To determine whether to enter humidity regulation; if Δ T is less than or equal to 0, according to the temperature differenceAnd determining whether to enter humidity regulation.
Further optionally, the time t varies according to the unit temperature T To determine whether to enter humidity regulation, including
Acquiring real-time temperature, and calculating unit temperature change time t according to the acquired real-time temperature T ；
Determining a net thermal load value ST corresponding to the current unit temperature change time tT according to a preset mapping relation table of the unit temperature change time and the net thermal load value;
and determining whether to enter humidity regulation or not according to the net heat load value ST.
Further optionally, said determining whether to enter humidity regulation based on the net thermal load value ST comprises
When the net heat load value ST =0, controlling the air conditioner to directly enter humidity regulation;
when the net heat load value ST is less than 0, the inner fan is adjusted to a low windshield to operate, and then the air conditioner is controlled to enter humidity regulation and control;
and when the net heat load value ST is greater than 0, controlling the air conditioner to keep refrigerating operation and returning to the initial state of the temperature and humidity linkage control mode.
Further optionally, determining whether to enter humidity control according to the temperature difference T, including
When the temperature difference T is less than or equal to 0, the inner fan is controlled to operate at a low wind shield;
judging whether the temperature difference T meets: if the temperature T is less than the set temperature difference, controlling the compressor to stop and returning to the initial state of the temperature and humidity linkage control mode again; if the temperature T is more than or equal to the set temperature difference when the temperature is 0, the air conditioner is controlled to enter the humidity control.
Further optionally, calculating a humidity difference R according to the real-time humidity and the humidity set by the user, and calculating a humidity difference R according to the humidity difference R and the unit humidity change time t T And inner tube temperature T Pipe To determine a control strategy for an air conditioner, comprising
Acquiring real-time humidity, and calculating unit humidity change time t according to the acquired real-time humidity R ；
According to preset unit humidityDetermining the current unit humidity change time t by the mapping relation table of the degree change time and the net humidity load value R The corresponding wet load value SR;
depending on the humidity difference, humidity load SR, inner tube temperature T Pipe It is determined to be a control strategy of the air conditioner.
Further optionally, the temperature of the inner tube is equal to the humidity difference R, the humidity load value SR and the temperature of the inner tube T Pipe To determine a control strategy for an air conditioner, comprising
When the humidity difference R is greater than 0, when SR =0, if the inner tube temperature T Pipe < dew point temperature T Dew point Keeping the running state of the system; if the inner pipe is at temperature T Pipe Not less than dew point temperature T Dew point Reducing the opening of the expansion valve;
when SR is greater than 0, raise the compressor running frequency;
when SR is less than 0, keeping system operation state.
Further optionally, the temperature of the inner tube is equal to the humidity difference R, the humidity load value SR and the temperature of the inner tube T Pipe To determine a control strategy for the air conditioner, further comprising
When the humidity difference R is less than or equal to 0, when SR =0, if the inner tube temperature T Pipe < dew point temperature T Dew point Increasing the opening of the expansion valve; if the inner pipe is at temperature T Pipe Not less than dew point temperature T Dew point Keeping the running state of the system;
when SR is greater than 0, keeping the system running state;
and when the SR is less than 0, reducing the running frequency of the compressor.
The invention also proposes a control device comprising one or more processors and a non-transitory computer-readable storage medium storing program instructions for implementing the method according to any one of the above when the program instructions are executed by the one or more processors.
The invention also provides an air conditioner which adopts the method of any one of the above or comprises the control device.
After adopting the technical scheme, compared with the prior art, the invention has the following beneficial effects:
the control method can accurately control the temperature and the humidity, so that the temperature and the humidity fluctuate within a set range in a small range, and the comfort of the environment is improved.
The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention, are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention without limiting the invention to the right. It is obvious that the drawings in the following description are only some embodiments, and that for a person skilled in the art, other drawings can be derived from them without inventive effort. In the drawings:
FIG. 1: is a control logic diagram of an embodiment of the present invention.
FIG. 2: the embodiment of the invention provides a logic diagram for judging whether to enter a temperature and humidity linkage control mode.
FIG. 3: the control logic diagram is the control logic diagram after the temperature and humidity linkage control mode is entered.
FIG. 4: the air conditioner provided by the embodiment of the invention regulates and controls the indoor temperature to a temperature and humidity curve graph with the user set temperature of 24 ℃ and the relative humidity of 45% in the environment with the indoor temperature of 30 ℃ and the relative humidity of 80%.
FIG. 5: the air conditioner provided by the embodiment of the invention regulates and controls the indoor temperature to a temperature and humidity curve diagram of 24 ℃ of the user set temperature and 55% of the relative humidity in the environment with the indoor temperature of 30 ℃ and the relative humidity of 80%.
FIG. 6: the air conditioner provided by the embodiment of the invention regulates and controls the indoor temperature to a temperature and humidity curve graph with the user set temperature of 24 ℃ and the relative humidity of 65% in the environment with the indoor temperature of 30 ℃ and the relative humidity of 80%.
FIG. 7 is a schematic view of: the air conditioner provided by the embodiment of the invention regulates and controls the indoor temperature to a temperature and humidity curve graph with the user set temperature of 24 ℃ and the relative humidity of 75% in the environment with the indoor temperature of 30 ℃ and the relative humidity of 80%.
It should be noted that the drawings and the description are not intended to limit the scope of the inventive concept in any way, but to illustrate it by a person skilled in the art with reference to specific embodiments.
Detailed Description
In the description of the present invention, it should be noted that the terms "inside", "outside", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, which are only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and operate, and thus, should not be construed as limiting the present invention.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," "contacting," and "communicating" are to be construed broadly, e.g., as meaning fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
To the problem that current air conditioner can't carry out accurate control to temperature and humidity simultaneously when refrigerating, this embodiment has provided an air conditioner temperature and humidity control method, and the air conditioner of this embodiment is equipped with the temperature and humidity coordinated control mode, and control method includes step S1~ S3, wherein:
s1, acquiring real-time temperature and real-time humidity of an indoor environment, and user set temperature and user set humidity in a refrigeration mode;
s2, calculating a temperature difference Δ T according to the real-time temperature and the user set temperature, and judging whether the temperature difference T is in the set temperature difference range;
s3, controlling the air conditioner to enter a temperature and humidity linkage control mode when the temperature difference T is within a set temperature difference range; in the temperature and humidity linkage control mode, the temperature is controlled according to the temperature difference T and the unit temperature change time T T To determine whether to enter humidity regulation; when the air conditioner entersAfter the humidity is controlled, the humidity difference R is calculated according to the real-time humidity and the humidity set by the user, and the humidity difference R and the unit humidity change time t R And inner tube temperature T Pipe To determine a control strategy of the air conditioner.
The embodiment is applied to the refrigeration mode of the variable frequency air conditioner, so that the temperature of a room can be reduced to the temperature set by a user during refrigeration, and meanwhile, the humidity value in the room can be synchronously controlled by adjusting the latent heat sensible heat ratio. In this embodiment, when the temperature difference between the real-time temperature and the user-set temperature is within the set temperature difference range, it is described that the set condition for entering the temperature and humidity linkage control mode is reached. After entering the temperature and humidity linkage control mode, depending on the temperature difference T and the unit temperature change time T T To determine whether to perform dehumidification, per unit temperature change time t T Reflects the change rate of the environmental temperature according to the unit temperature change time t T The relationship between the net heat load value and the system refrigerating capacity can be judged, so that the proper time for dehumidification is determined. After dehumidification, the temperature is changed according to the humidity difference R and the unit humidity change time t R To determine a control strategy. Time t per unit humidity change R Reflects the change rate of the environmental humidity according to the change time t of the unit humidity R The relation between the ambient humidity and the latent heat sensible heat ratio of the system is determined, the control strategy of the air conditioner is determined according to the relation between the latent heat sensible heat ratio of the system, and the air conditioner operates according to the determined control strategy, so that the temperature and the humidity are accurately controlled, the temperature and the humidity fluctuate within a set range in a small range, and the comfort of the environment is improved. In one embodiment, as shown in the control logic diagram of fig. 2, after the air conditioner is started, if the user sets the relative humidity value, the system is operated according to the normal variable frequency refrigeration logic, the value of Δ T is calculated in real time, and when the ambient temperature approaches the temperature set by the user, the system enters the temperature and humidity linkage control mode. Entry conditions were chosen here to be-2<∆T<2. And if the user does not set the relative humidity, the system is operated according to the normal refrigeration mode all the time.
In some specific embodiments, after the air conditioner enters the cooling mode, if the user sets the temperature and the humidity, after receiving a control instruction of the temperature and humidity linkage control mode sent by the user, the temperature difference T is judged to be within the temperature range set by the user, and then the air conditioner enters the temperature and humidity linkage control mode, and if the control instruction of the user is not received, the air conditioner is operated in the cooling mode all the time.
In other specific embodiments, after the air conditioner enters the cooling mode, if the temperature and the humidity are set by the user, the air conditioner directly enters the temperature and humidity linkage control mode after the temperature difference Δ T is within the temperature range set by the user.
And when the temperature difference between the real-time temperature and the temperature set by the user is not in the set temperature difference range, indicating that the set condition for entering the temperature and humidity linkage control mode is not met, and continuously operating according to the refrigeration mode.
After the air conditioner of the embodiment enters the temperature and humidity linkage mode, the mode process is executed circularly, and the circulation interval is not limited (the circulation judgment is once at an interval of 10min is suggested here). And each judgment condition parameter is collected and calculated in real time, such as Δ T and R, but only the value in the current cycle is taken for logic judgment each time the cycle is carried out. In a primary flow:
further optionally, step S3 comprises S31, wherein:
s31, judging whether the temperature difference Δ T meets the following conditions: Δ T > 0; if Δ T >0, according to the unit temperature change time T T To determine whether to enter humidity regulation; if the Δ T is less than or equal to 0, whether the humidity control is performed or not is determined according to the temperature difference T.
Further optionally, if Δ T >0, step S31 includes S311-S313, wherein:
s311, acquiring real-time temperature, and calculating unit temperature change time t according to the acquired real-time temperature T Time per unit temperature change t T = temperature difference per unit time/unit time;
s312, determining a net thermal load value ST corresponding to the current unit temperature change time tT according to a preset unit temperature change time-net thermal load value mapping relation table;
s313, determining whether to enter humidity regulation according to the net thermal load value ST, specifically, when the net thermal load value ST =0, controlling the air conditioner to directly enter humidity regulation; when the net heat load value ST is less than 0, the inner fan is adjusted to a low windshield to operate, and then the air conditioner is controlled to enter humidity regulation and control; and when the net heat load value ST is greater than 0, controlling the air conditioner to keep refrigerating operation and returning to the initial state of the temperature and humidity linkage control mode.
In this embodiment, when Δ T>And 0, judging the value of the net heat load value ST, and logically judging the relation between the environment temperature and the system refrigerating capacity by introducing the concept of the net heat load value ST, wherein the relation is a function of the change rate of the environment temperature. Here, the unit temperature change time t is introduced T ，t T = unit time/temperature difference in unit time, in a specific embodiment, set unit time as 1min, Δ Tmin as the environmental temperature change value in 1min, Δ T min =T At any point in time -T Before 1min At deg.C. In other embodiments, the unit time may also be 30s,2min, etc., and may be set according to requirements. In some embodiments, the preset mapping relationship table of unit temperature change time-net thermal load value includes the following correspondence relationship between unit temperature change time and net thermal load value:
Figure 432053DEST_PATH_IMAGE001
the physical meaning of the characterization of the net thermal load value ST here is explained as follows: when the temperature change is relatively slow, i.e. t T Is greater, here, t is taken T The absolute value is larger than 10min, which means that the room temperature change rate is slow at the moment, and further represents that the refrigerating capacity (latent heat value + sensible heat value) of the air conditioner is equivalent to the heat load of the room, wherein the positive sign and the negative sign only represent the direction of the temperature change and do not represent the magnitude of the numerical value. If the refrigerating capacity of the air conditioner is larger or smaller than the heat load of the room, the change time of the unit temperature is smaller, t T Should be small, where t is taken T The absolute value is less than 10. To facilitate logical judgment, the temperature rises rapidly (0)<t T <10 ST =1; while the temperature is kept constant (10)<t T Or t T <-10), ST =0; when the temperature drops rapidly (0)>t T >-10），ST= -1。
Of course, the correspondence between the change time of the unit temperature and the net thermal load value ST is not limited to the correspondence listed above, but it should be noted that when ST =0, humidity control is performed; at this time, although the temperature is higher than the temperature set by the user, the temperature is already within the set temperature difference range, ST =0 shows that the temperature changes slowly, the refrigerating capacity and the heat load of the system are relatively close, and the ambient humidity can be adjusted by changing the latent heat ratio. When ST is more than 0, controlling the air conditioner to operate in a normal refrigeration mode and returning to a mode judgment initial stage; at the moment, the temperature is higher than the temperature set by a user, ST is more than 0, the ambient temperature is rapidly increased, the refrigerating capacity of the air conditioning system is far less than the heat load, the overall logic takes the control temperature as the primary condition, and then the temperature control is carried out according to the normal refrigerating mode. When ST is less than 0, adjusting the rotating speed of an inner machine fan to a low wind gear and entering humidity regulation and control; at the moment, the temperature is rapidly reduced, the refrigerating capacity is far greater than the heat load, the rotating speed of the internal machine is adjusted to a low wind level, the refrigerating capacity is reduced, the latent heat ratio is improved, and the environment humidity is finely adjusted and controlled through the system.
Further optionally, if Δ T is less than or equal to 0, step S31 includes S311 'to S312', where:
s311', when the temperature difference T is judged to be less than or equal to 0, controlling the inner fan to run at a low windshield;
s312', judge whether the temperature difference Δ T satisfies: if the temperature T is less than the set temperature difference, controlling the compressor to stop and returning to the initial state of the temperature and humidity linkage control mode again; if the temperature T is more than or equal to the set temperature difference when the temperature is 0, the air conditioner is controlled to enter the humidity control.
In the embodiment, if Δ T is less than or equal to 0, the ambient temperature is less than the temperature set by the user, the rotating speed of the fan of the internal machine is set to be a low wind gear, and whether dehumidification is performed is judged. If the Δ T is less than-2, the compressor is stopped and returns to the mode starting stage; when the temperature difference is less than the set temperature difference, for example, less than-2 ℃, the refrigerating capacity is far greater than the heat load, so that the compressor stops running and the indoor unit keeps supplying air for quick heating without causing the trouble of users, thereby having the minimum influence on the sense of the users. When the temperature T is more than or equal to 0 and more than or equal to a set temperature difference, for example, the temperature T is more than or equal to-2 ℃ at 0 and more than or equal to the temperature, the cooling amount is slightly larger than the heat load, the cooling rate can be slowed down under the condition of low wind speed, the comfort of a user can be ensured, and the humidity control is started at the moment. In this embodiment, after the humidity is adjusted, the wind speed is set to a low wind speed. Low wind speeds increase the latent heat ratio, which can also be considered as increasing the absolute moisture removal. Under the same pipe temperature condition, the pipe temperature is lower than the dew point temperature, the smaller the wind speed is, the larger the latent heat quantity is, namely, the moisture in the air is easier to condense into liquid state, thereby reducing the humidity. Therefore, the latent heat ratio of the refrigerating system can be changed by adjusting the wind speed, and the aim of controlling the humidity can be achieved. However, the wind speed is a parameter that the user feels intuitively, and the changing wind speed causes discomfort and troubles to the user. Moreover, if the control parameters are too much, the instability of the system is increased, and the difficulty of parameter adjustment is increased, so that the stability of the wind speed in the humidity adjusting process is kept.
Further optionally, step S3 further includes S32 to S34, where:
s32, calculating unit humidity change time t according to the acquired real-time humidity R Time of change per unit humidity t R = humidity difference per unit time;
s33, determining the current unit humidity change time t according to a preset mapping relation table of the unit humidity change time and the net humidity load value R The corresponding wet load value SR;
s34, depending on the humidity difference R, humidity load SR, inner tube temperature T Pipe To determine a control strategy of the air conditioner. Specifically, when the humidity difference R is more than 0, when SR =0, if the inner tube temperature T Pipe < dew point temperature T Dew point Keeping the system running state; if the inner pipe is at temperature T Pipe Not less than dew point temperature T Dew point Reducing the opening of the expansion valve; when SR is greater than 0, raise the compressor running frequency; when SR <0, keep the system running state. When the humidity difference R is less than or equal to 0, when SR =0, if the inner tube temperature T Pipe < dew point temperature T Dew point Increasing the opening of the expansion valve; if the inner pipe is at temperature T Pipe Not less than dew point temperature T Dew point Keeping the running state of the system; when SR is greater than 0, keeping the system running state; and when the SR is less than 0, reducing the running frequency of the compressor.
The embodiment introduces the concept of net moisture load value for logically judging the ambient humidity and the latent heat display of the systemThermal ratio, which is a function of the rate of change of ambient humidity. Here, the unit humidity change time, t, is introduced R = humidity difference per unit time/unit time, in some embodiments wherein:
Δ Rmin is the environmental humidity change value in 1min min =R At any time point -R Before 1min % of the amount of the compound (b). In other embodiments, the unit time may also be 30s,2min, etc., and may be set according to requirements. In one embodiment, the preset mapping relationship between the unit humidity change time and the net humidity load value SR in the unit humidity change time-net humidity load value SR table has the following correspondence relationship:
Figure 551844DEST_PATH_IMAGE002
the physical meaning of the characterization of the net moisture load value SR here is explained as follows: when the humidity changes more slowly, i.e. t R Is greater, here, t is taken R The absolute value is larger than 10min, which means that the room humidity change rate is slow at the moment, and further represents that the latent heat quantity of the air conditioner is equivalent to the humidity load of the room, and the sign only represents the humidity change direction and does not represent the value. If the latent heat of the air conditioner is larger or smaller than the heat load of the room, the change time of the unit humidity is smaller, t R Should be small, where t is taken R The absolute value is less than 10. To facilitate logical judgment, when humidity rises rapidly (0)<t R <10 SR =1; while the humidity remains constant (10)<t R Or t R <-10), SR =0; when the humidity drops rapidly (0)>t R >-10），SR= -1。
Of course, the correspondence between the change time of the unit humidity and the net moisture load SR is not limited to the above-listed correspondence, but it should be noted that the Δ R value is determined after the humidity control is performed, and if the Δ R is less than 0, the net moisture load SR value is further determined.
If SR <0, reduce the compressor running frequency, for example reduce 2Hz, then return to the initial stage of the temperature and humidity linkage control mode; the humidity is less than the humidity set by the user, the environment humidity is reduced rapidly, the latent heat is large, the pipe temperature is low, the system flow can be reduced by reducing the frequency of the 2Hz compressor, the superheat degree of the refrigerant in the evaporator can be increased after the refrigerant amount is reduced, and the average pipe temperature can be increased. In the normal expansion valve control logic, the expansion valve is linked with the compressor frequency, so that when the compressor frequency is reduced, the opening degree of the expansion valve is increased, the evaporation temperature is increased, and the pipe temperature is also reduced. From these two dimensions, reducing the compressor frequency reduces the latent heat ratio and reduces the amount of dehumidification.
If SR =0, further judge T Pipe If T is Pipe <T Dew point Then, the opening degree of the expansion valve is increased, for example, increased by 5B, and the mode returns to the initial stage; if SR =0, and T Pipe ≥T Dew point If so, keeping the system state and returning to the mode initial stage; here, the mode fine adjustment state is a state in which the expansion valve opening degree and the compressor frequency are controlled in an interlocking manner, but the expansion valve is controlled alone at this time without changing the compressor frequency. By changing the opening degree of the expansion valve, the pressure drop can be changed, i.e. the evaporation pressure is changed, thereby changing the tube temperature. When the ambient humidity is lower than the humidity set by the user, SR =0 means that the latent heat amount corresponds to the humidity load, and when the tube temperature is lower than the dew point temperature, moisture continues to be condensed and precipitated, and the humidity continues to decrease, the tube temperature is increased, and the latent heat ratio is decreased. And if the pipe temperature is not less than the dew point temperature, keeping the system running state until next judgment. Here, since the system is in equilibrium, fine tuning of system parameters will change the equilibrium conditions, the ambient humidity will be in a slow rise or fall process, and if it is in a different stage at the next determination, another control statement is executed.
If SR is greater than 0, then keeping system state, returning to mode initial stage; here, although SR >0 means that the humidity is rising rapidly, the logic we enter into humidity control is that the temperature difference T is within the set temperature difference, e.g., within 2℃, meaning that the cooling capacity is not much different from the heat load here.
Preferably, in the unit humidity change time-net moisture load correspondence table, the judgment logic time node is consistent with the time node of the whole logic cycle of the temperature and humidity linkage control, optionally, the judgment logic time node of the net moisture load is 10min and is consistent with the time node of the logic cycle, that is, 10min is a cycle, and the condition of rapid rise is that the rise is 1% within 10min, that is, the environmental humidity does not exceed 10% although the environmental humidity rises when the next logic cycle is performed. If the environmental humidity is higher than the humidity set by the user during the next logic circulation judgment, executing other statements, if the environmental humidity is still lower than the humidity set by the user, and the humidity change rate is not constant and will be slower and slower, then controlling the system parameters through the SR value at the time.
If Δ R >0, the SR value of the net moisture load is further judged. If SR >0, increase the compressor running frequency. For example, 2Hz, returning to the initial stage of the mode; here, SR >0 means that when the ambient humidity is higher than the humidity set by the user and the ambient humidity rises rapidly, the frequency of the 2Hz compressor is increased, and at this time, the tube temperature will be decreased, the latent heat will be increased, and the capacity of the system to condense water will be improved.
If SR =0, further judge T pipe, if T pipe > T dew point, reduce the expansion valve opening degree, for example reduce 5B, return to the initial stage of the mode; if SR =0 and T pipe < T dew point, keeping the system state, and returning to the mode starting stage; here, SR =0 means that the ambient humidity changes slowly, and if the tube temperature is lower than the dew point temperature, moisture is continuously condensed and precipitated, and we maintain the system state in order to maintain the stability of the system. If the temperature of the pipe is higher than the dew point temperature, the latent heat is zero at present, and the opening degree of the expansion valve is slightly reduced, so that the evaporator continuously condenses water.
If SR is less than 0, then keeping system state, returning to mode initial stage; and when the humidity is reduced, the system state is kept, and logic judgment is carried out according to the environmental parameters in the next circulation.
Dew point temperature T of the present embodiment Dew point The dew point temperature can be calculated from the relative humidity and the temperature of the air, and in the scheme, the environmental temperature and the humidity are known conditions, and the default dew point temperature is the known condition;
in this embodiment, the maximum and minimum frequencies of the compressor and the maximum and minimum opening degrees of the expansion valve are different according to different monomers, and are not restricted in this embodiment, and are set according to different product models in the process of using this embodiment
The process exit conditions in this embodiment are shutdown and cancellation of humidity control parameters and any other conditions that cause shutdown in any system reliability determination logic, including but not limited to fluorine-deficient protection, over-temperature protection, high-voltage protection, and the like. The content of the invention not being described in the present application is not described in the present application.
The unit temperature or humidity change time is used as a representation and can correspond to the cycle time conveniently, and when the temperature and humidity change rate is judged, the logic readability can be improved and the parameters can be adjusted conveniently by using the uniform time. In addition, by introducing the net heat load and the net humidity load value, the logic complexity can be reduced, and the system reliability is improved.
In this embodiment, temperature and humidity control is performed according to the above control method for an environment in which the indoor temperature and the relative humidity are 30 ℃ and 80%, respectively, and when the temperature and the humidity set by the user are 24 ℃ and 45% -75%, respectively, and a certain heat and humidity load is applied in the temperature and humidity control process. After the operation is carried out for a period of time, the temperature and the humidity can be stabilized in a smaller range near the user set temperature and the user set humidity, and specific operation curves are shown in fig. 4-7. It can be seen from fig. 4-7 that, after the temperature and humidity linkage control mode of this embodiment is adopted, both the indoor temperature value and the indoor relative humidity can fluctuate within a small range within the temperature range and the humidity range set by the user.
The present embodiments also propose a control device comprising one or more processors and a non-transitory computer-readable storage medium storing program instructions for implementing the method according to any one of the above when the program instructions are executed by the one or more processors.
The embodiment also provides an air conditioner which adopts the method of any one of the above items or comprises the control device.
Although the present invention has been described with reference to a preferred embodiment, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims (9)

1. The air conditioner temperature and humidity control method is characterized in that the air conditioner is provided with a temperature and humidity linkage control mode, and the control method comprises the following steps:
acquiring real-time temperature and real-time humidity of an indoor environment, and user set temperature and user set humidity in a refrigeration mode;
calculating the temperature difference T according to the real-time temperature and the user set temperature, and judging whether the temperature difference T is in the set temperature difference range;
when the temperature difference T is within the set temperature difference range, controlling the air conditioner to enter a temperature and humidity linkage control mode;
in the temperature and humidity linkage control mode, the temperature is controlled according to the temperature difference T and the unit temperature change time T T To determine whether to enter humidity regulation and control and the unit temperature change time t T = temperature difference per unit time/unit time;
when the air conditioner enters the humidity control, the humidity difference R is calculated according to the real-time humidity and the humidity set by the user, and the unit humidity changes for a time t according to the humidity difference R R And inner tube temperature T Pipe To determine the control strategy of the air conditioner, unit humidity change time t R = humidity difference per unit time/unit time;
in the temperature and humidity linkage control mode, the temperature is controlled according to the temperature difference T and the unit temperature change time T T To determine whether to enter humidity regulation, including
Judging whether the temperature difference T meets: Δ T > 0; if Δ T >0, according to the unit temperature change time T T To determine whether to enter humidity regulation; if the Δ T is less than or equal to 0, whether the humidity control is performed or not is determined according to the temperature difference T.
2. The temperature and humidity control method of air conditioner according to claim 1, wherein the time t varies according to unit temperature T To determine whether to enter humidity regulation, including
Acquiring real-time temperature, and calculating unit temperature change time t according to the acquired real-time temperature T ；
Determining a net thermal load value ST corresponding to the current unit temperature change time tT according to a preset mapping relation table of the unit temperature change time and the net thermal load value;
and determining whether to enter humidity regulation or not according to the net heat load value ST.
3. The method as claimed in claim 2, wherein the determining whether to enter humidity control according to the net thermal load value ST comprises
When the net heat load value ST =0, controlling the air conditioner to directly enter humidity regulation;
when the net heat load value ST is less than 0, the inner fan is adjusted to a low windshield to operate, and then the air conditioner is controlled to enter humidity regulation and control;
and when the net heat load value ST is greater than 0, controlling the air conditioner to keep refrigerating operation and returning to the initial state of the temperature and humidity linkage control mode.
4. The temperature and humidity control method of an air conditioner according to claim 1, wherein determining whether to enter humidity control according to the temperature difference T includes
When the temperature difference T is less than or equal to 0, controlling the inner fan to run at a low wind shield;
judging whether the temperature difference T meets: if the temperature T is less than the set temperature difference, controlling the compressor to stop and returning to the initial state of the temperature and humidity linkage control mode again; if the temperature T is more than or equal to the set temperature difference when the temperature is 0, the air conditioner is controlled to enter the humidity control.
5. The temperature and humidity control method for an air conditioner according to any one of claims 1-4, wherein the humidity difference R is calculated according to the real-time humidity and the user-set humidity, and the unit humidity changes for a time t R And inner tube temperature T Pipe To determine a control strategy for an air conditioner, comprising
Acquiring real-time humidity, and calculating unit humidity change time t according to the acquired real-time humidity R ；
Determining the current unit humidity change time t according to a preset mapping relation table of the unit humidity change time and the net moisture load value R The corresponding wet load value SR;
according to the humidity difference Δ R, the humidity load value SR and the inner tube temperature T Pipe To determine a control strategy of the air conditioner.
6. The temperature and humidity control method for air conditioner according to claim 5, wherein the temperature is Δ R, SR, T according to the humidity difference Pipe To determine a control strategy for an air conditioner, comprising
When the humidity difference R is greater than 0, when SR =0, if the inner tube temperature T Pipe < dew point temperature T Dew point Keeping the running state of the system; if the inner pipe is at temperature T Pipe Not less than dew point temperature T Dew point Reducing the opening of the expansion valve;
when SR is greater than 0, raise the compressor running frequency;
when SR is less than 0, keeping system operation state.
7. The temperature and humidity control method for air conditioner according to claim 6, wherein the temperature is Δ R, SR, T according to the humidity difference Pipe To determine a control strategy for the air conditioner, further comprising
When the humidity difference R is less than or equal to 0, when SR =0, if the inner tube temperature T Pipe < dew point temperature T Dew point Increasing the opening of the expansion valve; if the inner pipe is at temperature T Pipe Not less than dew point temperature T Dew point Keeping the system running state；
When SR is greater than 0, keeping the system running state;
and when the SR is less than 0, reducing the running frequency of the compressor.
8. A control apparatus, comprising one or more processors and a non-transitory computer-readable storage medium having program instructions stored thereon, the one or more processors being configured to implement the method of any one of claims 1-7 when the program instructions are executed by the one or more processors.
9. An air conditioner characterised in that it employs the method of any one of claims 1 to 7 or includes the control apparatus of claim 8.
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