CN114543282A - Air conditioner dehumidification control method and system - Google Patents
Air conditioner dehumidification control method and system Download PDFInfo
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- CN114543282A CN114543282A CN202210157470.3A CN202210157470A CN114543282A CN 114543282 A CN114543282 A CN 114543282A CN 202210157470 A CN202210157470 A CN 202210157470A CN 114543282 A CN114543282 A CN 114543282A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/50—Control or safety arrangements characterised by user interfaces or communication
- F24F11/54—Control or safety arrangements characterised by user interfaces or communication using one central controller connected to several sub-controllers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/50—Control or safety arrangements characterised by user interfaces or communication
- F24F11/61—Control or safety arrangements characterised by user interfaces or communication using timers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
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- F24—HEATING; RANGES; VENTILATING
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- F24F11/00—Control or safety arrangements
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- F24F11/72—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure
- F24F11/74—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure for controlling air flow rate or air velocity
- F24F11/77—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure for controlling air flow rate or air velocity by controlling the speed of ventilators
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
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- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
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Abstract
The invention provides an air conditioner dehumidification control method and system, when the environment temperature is more than or equal to the set environment temperature, the frequency of a compressor and the air speed of an indoor fan are controlled according to the humidity difference value of the environment humidity and the set humidity, when the environment temperature is less than the set environment temperature, different control means are distinguished according to the current dew point temperature, when the dew point temperature is more than or equal to the low-temperature dew point temperature threshold value, the frequency of the compressor and the air speed of the indoor fan are controlled according to the humidity difference value of the environment humidity and the set humidity, and when the dew point temperature is less than the low-temperature dew point temperature threshold value, intermittent dehumidification control is executed; the invention adopts the set ring temperature as a control node to distinguish normal-temperature dynamic dehumidification and low-temperature dynamic dehumidification, in the normal-temperature dynamic dehumidification and the low-temperature dynamic dehumidification, high-efficiency dehumidification and energy-saving dehumidification are distinguished according to the humidity difference value of the environment humidity and the set humidity, and in the low-temperature dynamic dehumidification, dynamic dehumidification and intermittent dehumidification are distinguished according to the dew point temperature, thereby achieving the dehumidification effect which is uninterrupted and has high efficiency and energy saving.
Description
Technical Field
The invention belongs to the technical field of air conditioners, and particularly relates to an air conditioner dehumidification control method and system.
Background
The air conditioner is under the refrigeration operating mode, because the evaporating temperature of heat exchanger is lower, also can be based on condensation phenomenon and corresponding reduction indoor humidity to reach the effect of dehumidification, consequently, the air conditioner can also be based on the dehumidification function is implemented in the refrigeration operating mode design dehumidification mode.
According to the dehumidification principle, effective dehumidification control can be realized only when the condition that the evaporation temperature Tl of the heat exchanger is less than the dew point temperature Td of the environment is reached, but the conventional air conditioner dehumidification control logic at present is refrigeration operation, the control can effectively perform dehumidification under the conditions of high temperature and high humidity, for example, the evaporation temperature Tl of the heat exchanger is easily lower than the dew point temperature Td when the environment temperature is 26 ℃ and the humidity is 80 percent under the condition that the dew point temperature is 22.28 ℃ and the evaporation temperature Tl of the heat exchanger is easily lower than the dew point temperature Td when the refrigeration operation is performed under the condition, but when the dew point temperature Td is reduced to be lower than 10 ℃ but the environment humidity does not reach the set humidity, the evaporation temperature Tl of the heat exchanger is not lower than the dew point temperature Td when the refrigeration operation is performed, and the dehumidification effect is not achieved or the effect is not good.
Meanwhile, when dehumidification is carried out under extremely low temperature and high humidity conditions, the environment dew point temperature Td is too low, the condition that the dew point temperature Td is lower than 3 ℃ often occurs, when the air conditioner is in dehumidification operation, the compressor is shut down due to reliability control such as freezing prevention of the air conditioner, and the evaporation temperature Tl of the heat exchanger is higher than the environment dew point temperature Td, so that continuous dehumidification of the heat exchanger at extremely low temperature cannot be ensured for a long time, the dehumidification effect cannot be achieved, and energy is wasted.
Disclosure of Invention
The invention provides an air conditioner dehumidification control method and system aiming at the technical problem that the air conditioner cannot continuously dehumidify and cannot achieve the dehumidification effect under the low-temperature high-humidity environment.
The invention adopts the following technical scheme:
the air conditioner dehumidification control method comprises the following steps of circularly executing:
acquiring the ambient temperature and the ambient humidity;
calculating a dew point temperature based on the ambient temperature and the ambient humidity;
when the ambient temperature is greater than or equal to the set ambient temperature, controlling the frequency of the compressor and the air speed of the indoor fan based on the humidity difference value of the ambient humidity and the set humidity;
when the environmental temperature is lower than the set environmental temperature, if the dew point temperature is higher than or equal to the low-temperature dew point temperature threshold, controlling the frequency of the compressor and the wind speed of the indoor fan based on the humidity difference value of the environmental humidity and the set humidity; and if the dew point temperature is less than the low-temperature dew point temperature threshold value, executing intermittent dehumidification control.
An air conditioning dehumidification system is proposed, comprising:
a compressor and an indoor fan;
the temperature sensor is arranged at an air return inlet of the air conditioner and used for detecting the ambient temperature;
the humidity sensor is arranged at an air return inlet of the air conditioner and used for detecting the environmental humidity;
the acquisition module is used for acquiring the ambient temperature and the ambient humidity;
the dew point temperature calculation module is used for calculating the dew point temperature based on the environment temperature and the environment humidity;
the dynamic dehumidification control module is used for controlling the frequency of the compressor and the air speed of the indoor fan based on the humidity difference value of the environment humidity and the set humidity when the environment temperature is greater than or equal to the set environment temperature;
the low-temperature dynamic dehumidification control module is used for controlling the frequency of the compressor and the wind speed of the indoor fan based on the humidity difference value of the environment humidity and the set humidity if the dew point temperature is greater than or equal to a low-temperature dew point temperature threshold when the environment temperature is less than the set environment temperature; and if the dew point temperature is less than the low-temperature dew point temperature threshold value, executing intermittent dehumidification control.
Compared with the prior art, the method has the following technical effects: according to the air conditioner dehumidification control method and the system, different control means are distinguished according to the environment temperature, when the environment temperature is greater than or equal to the set environment temperature, the frequency of the compressor and the air speed of the indoor fan are controlled according to the humidity difference value of the environment humidity and the set humidity, so that the continuous dehumidification effect is achieved, when the environment temperature is less than the set environment temperature, different control means are further distinguished according to the current dew point temperature, when the dew point temperature is greater than or equal to the low-temperature dew point temperature threshold value, the frequency of the compressor and the air speed of the indoor fan are controlled according to the humidity difference value of the environment humidity and the set humidity, so that the continuous dehumidification effect is achieved, when the dew point temperature is less than the low-temperature dew point temperature threshold value, the intermittent dehumidification control is executed, and on the premise of preventing the system from being protected, the dehumidification can be carried out without stopping; the invention adopts the set ring temperature as a control node to distinguish dynamic dehumidification control and low-temperature dynamic dehumidification control, adopts the humidity difference to adjust the frequency of a compressor and the air speed of an indoor fan aiming at the dynamic dehumidification control and the low-temperature dynamic dehumidification control to realize continuous dehumidification, further adopts the dew point temperature as the control node in the low-temperature dynamic dehumidification control, executes intermittent dehumidification control when the dew point temperature is extremely low, effectively prevents a heat exchanger from being frozen and enters anti-freezing protection while keeping continuous dehumidification without stopping, realizes the effects of continuous dehumidification and high-efficiency and energy-saving dehumidification, and solves the technical problem that the air conditioner cannot continuously dehumidify and cannot achieve the dehumidification effect in the existing low-temperature and high-humidity environment.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is an exemplary control flow for dynamic dehumidification control in accordance with the present invention;
FIG. 2 is a comparative example of the dynamic dehumidification control of the present invention with a conventional dehumidification control;
FIG. 3 is a diagram illustrating an example of intermittent dehumidification control under low-temperature dynamic dehumidification control according to the present invention;
FIG. 4 is a schematic flow chart of a dehumidification control method for an air conditioner according to the present invention;
fig. 5 is a flowchart illustrating a dehumidification control method of an air conditioner according to a first embodiment of the present invention;
fig. 6 is a flowchart illustrating a dehumidification control method of an air conditioner according to a second embodiment of the present invention;
fig. 7 is an exemplary system architecture of an air conditioning and dehumidifying system according to the present invention;
FIG. 8 is a second exemplary system architecture of the air conditioning and dehumidifying system according to the present invention;
fig. 9 is a third exemplary system architecture of an air conditioning and dehumidifying system according to the present invention;
FIG. 10 is a fourth exemplary system architecture of the air conditioning and dehumidifying system of the present invention;
fig. 11 is a fifth exemplary system architecture of the air conditioning and dehumidifying system according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on those shown in the drawings, and are merely for convenience of description and simplicity of description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, are not to be construed as limiting the present invention.
In the description of the present invention, it should be noted that the terms "mounted," "connected," and "connected" are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected unless otherwise explicitly stated or limited. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art. In the foregoing description of embodiments, the particular features, structures, materials, or characteristics may be combined in any suitable manner in any one or more embodiments or examples.
The terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
The invention aims to provide an air conditioner control mode for uninterrupted dehumidification aiming at the working conditions that the dew point temperature is too low due to low temperature and high humidity in special storage areas such as southern Return-to-south climate, wine cellars and the like, so that dynamic dehumidification without shutdown and high efficiency and energy conservation at normal temperature, dynamic dehumidification without shutdown and high efficiency and energy conservation at low temperature and effective dehumidification without shutdown at the working conditions of extremely low temperature and extremely low moisture content are realized.
The dehumidification control method according to the present invention will be explained below.
1. Dynamic dehumidification
In the design of the invention, the dynamic dehumidification is a control method which realizes the non-stop of the air conditioner and takes high-efficiency dehumidification and energy-saving dehumidification into consideration under the normal-temperature working condition and the low-temperature working condition.
According to the principle of dehumidification, the precondition for effective dehumidification is that the evaporation temperature Tl of the indoor heat exchanger is less than the dew point temperature Td, i.e. Tl < Td.
According to the invention, the temperature sensor and the humidity sensor are arranged at the air return inlet of the air conditioner to detect the ambient temperature Ti and the ambient humidity RHI, the dew point temperature Td of the environment can be calculated through the ambient temperature Ti and the ambient humidity RHI, and the evaporation temperature Tl of the indoor heat exchanger is dynamically adjusted by adjusting the compressor frequency Fi of the air conditioner and the air speed F of the indoor fan, so that the effect of uninterrupted dehumidification is achieved when the evaporation temperature Tl is lower than the dew point temperature Td.
In the invention, as shown in fig. 1, the frequency Fi of the compressor and the wind speed F of the indoor fan are further controlled according to the humidity difference Δ RH between the set humidity RHs and the ambient humidity RHi set by the user, and when the humidity difference Δ RH is large, the dehumidification speed and effect are improved by increasing the frequency of the compressor and operating the indoor fan at high speed, so as to realize high-efficiency dehumidification; when the humidity difference value delta RH is small, energy-saving dehumidification is realized by frequency reduction of the compressor and low-speed operation of the indoor fan; when the humidity difference Δ RH is zero, the dehumidification control is stopped.
In the dehumidification mode operation of the air conditioner, the ambient temperature and the ambient humidity are repeatedly acquired according to a set time interval or other condition limits, and the control is executed to achieve the dynamic dehumidification regulation.
As shown in fig. 2, compared to the conventional dehumidification control, the dynamic dehumidification realizes fast and efficient dehumidification, and simultaneously saves energy by about 55%, wherein the control humidity is the switching point between efficient dehumidification and energy-saving dehumidification.
2. Low temperature dynamic dehumidification
Under the working condition that the ambient temperature Ti and the ambient humidity RHI are both relatively high, the dew point temperature Td of the environment is also relatively high, and the purpose of dehumidification can be realized through common refrigeration operation, for example, under the working condition that the ambient temperature is 26 ℃ and the ambient humidity is 80%, the dew point temperature is 22.28 ℃, and the evaporator in the common refrigeration operation can be lower than 22.28 ℃ to achieve the dehumidification effect.
Under the working conditions of relatively low ambient temperature Ti and relatively high ambient humidity RHi, the dew point temperature Td of the environment is relatively low, and if the evaporation temperature Tl of the indoor heat exchanger cannot be lower than the dew point temperature Td, the dehumidification effect cannot be achieved in the ordinary refrigeration operation, for example, under the working conditions of 10 ℃ of ambient temperature and 70% of ambient humidity, the dew point temperature is 4.8 ℃, the temperature of the evaporator in the ordinary refrigeration operation is relatively difficult to be lower than 4.8 ℃ and the dehumidification effect cannot be achieved, and when the evaporation temperature is too low, the heat exchanger is frozen, so that the shutdown operation of the system is performed due to anti-freezing protection.
In the invention, normal-temperature dynamic dehumidification and low-temperature dynamic dehumidification are distinguished according to an ambient temperature Ti, in the low-temperature dynamic dehumidification, a low-temperature dew point temperature threshold Tt is further set according to a dew point temperature distinguishing control means, when the dew point temperature Td is greater than or equal to the low-temperature dew point temperature threshold Tt, namely the Td is greater than or equal to the Tt, the frequency Fi of a compressor and the wind speed F of an indoor fan are controlled according to the humidity difference delta RH of the set humidity Rhs and the ambient humidity Rhi set by a user, and when the humidity difference delta RH is larger, the dehumidification speed and the dehumidification effect are improved through the frequency increase of the compressor and the high-speed operation of the indoor fan, so that the high-efficiency dehumidification is realized; when the humidity difference value delta RH is small, energy-saving dehumidification is realized by frequency reduction of the compressor and low-speed operation of the indoor fan; when the humidity difference value delta RH is zero, stopping dehumidification control; when the dew point temperature Td is lower than the low-temperature dew point temperature threshold Tt, namely Td < Tt, intermittent dehumidification control is executed, continuous dehumidification is kept in an intermittent dehumidification mode, and the indoor heat exchanger is maintained to be stopped without entering anti-freezing protection.
Different from the normal-temperature dynamic dehumidification control given in 1, the target evaporation temperature of the indoor heat exchanger under the low-temperature dynamic dehumidification working condition is different from the target evaporation temperature of the indoor heat exchanger under the normal-temperature dynamic dehumidification working condition in the aspects of compressor frequency Fi control and air speed F control of the indoor fan.
3. Intermittent dehumidification
As shown in fig. 3, when the temperature lower than the dew point temperature is the target evaporation temperature of the indoor heat exchanger, the indoor heat exchanger is repeatedly operated for the first set time t1 and then stopped for the second set time t2 in a mode of increasing the frequency of the compressor and operating the indoor fan at a low wind speed, so that uninterrupted dehumidification is achieved, and the indoor heat exchanger is prevented from being stopped due to anti-freezing protection.
In combination with the above control, as shown in fig. 4, the air conditioner dehumidification control method provided by the present invention includes the following steps that are executed in a cyclic manner:
step S41: and acquiring the ambient temperature and the ambient humidity, and calculating the dew point temperature based on the ambient temperature and the ambient humidity.
The method comprises the steps of obtaining an ambient temperature Ti and an ambient humidity RHi through a temperature sensor and a humidity sensor, and obtaining a current dew point temperature Td through table look-up, formula calculation and the like according to the obtained Ti and RHi.
Step S42: and when the ambient temperature is greater than or equal to the set ambient temperature, controlling the frequency of the compressor and the air speed of the indoor fan based on the humidity difference value between the ambient humidity and the set humidity.
And taking 18 ℃ as a set environment temperature, namely taking 18 ℃ as an environment temperature node, executing normal-temperature dynamic dehumidification control when the environment temperature Ti is more than or equal to 18 ℃, and dynamically adjusting the frequency Fi of the compressor and the wind speed F of the indoor fan based on the humidity difference delta RH between the environment humidity Rhi and the set humidity Rhs.
Specifically, the humidity difference Δ RH is different, and the adjustment means for the frequency Fi of the compressor and the wind speed F of the indoor fan is also different, and the fundamental control means is to give the target evaporation temperature Tlf of the indoor heat exchanger, and adjust the frequency Fi of the compressor and the wind speed F of the indoor fan to achieve the target evaporation temperature Tlf of the indoor heat exchanger.
Generally, the target evaporation temperature Tlf is lower than the dew point Td to achieve uninterrupted dehumidification, i.e., the target evaporation temperature Tlf may be a dynamic adjustment value that changes with the change of the dew point or a set value.
Particularly, under the working condition of a large humidity difference value delta RH, the target evaporation temperature Tlf can be controlled through the frequency increase of the compressor and the high-wind-speed operation of the indoor fan, so that the target evaporation temperature Tlf is far lower than the dew point temperature Td, and efficient dehumidification can be realized; under the working condition that the humidity difference delta RH is small, the target evaporation temperature Tlf can be controlled through the compressor frequency reduction and the low-wind-speed operation of the indoor fan, and the target evaporation temperature is slightly lower than the dew point temperature Td, so that uninterrupted and energy-saving dehumidification can be realized.
Step S43: and when the environment temperature is lower than the set ring temperature, comparing the dew point temperature with a low-temperature dew point temperature threshold value.
And when the ambient temperature Ti is less than the set ambient temperature of 18 ℃, executing low-temperature dynamic dehumidification control, and further taking a low-temperature dew point temperature threshold Td0 as a node in the low-temperature dynamic dehumidification control to distinguish uninterrupted low-temperature dynamic dehumidification control and intermittent dehumidification control.
Step S44: and when the dew point temperature is greater than or equal to the low-temperature dew point temperature threshold, controlling the frequency of the compressor and the wind speed of the indoor fan based on the humidity difference value of the environmental humidity and the set humidity.
The control of low-temperature dynamic dehumidification is basically the same as that of normal-temperature dynamic dehumidification, and the difference is that the target evaporation temperature of the indoor heat exchanger under the low-temperature dynamic dehumidification working condition is different from that of the indoor heat exchanger under the normal-temperature dynamic dehumidification working condition in the aspects of compressor frequency Fi control and air speed F control of an indoor fan.
Step S45: and when the dew point temperature is less than the low-temperature dew point temperature threshold value, executing intermittent dehumidification control.
Taking the low-temperature dew point temperature threshold value of 3 ℃ as an example, when the dew point temperature is very low, the ambient temperature Ti is also very low, the ambient humidity RHi is high, if the air conditioner is continuously operated for dehumidification, the evaporation temperature of the indoor heat exchanger is close to 0 ℃, a frosting phenomenon occurs, the system is shut down and enters an anti-freezing protection state, the indoor evaporator cannot be ensured to be continuously operated at the extremely low temperature, and the evaporation temperature of the indoor heat exchanger is higher than the dew point temperature, so that the dehumidification effect cannot be achieved.
The invention realizes that the air conditioner can be kept dynamically regulated to realize uninterrupted dehumidification no matter under the working condition of normal temperature or low temperature through the steps, and is particularly suitable for the working conditions requiring low-temperature and low-humidity environments such as southern China, basement, wine cellar, storage room and the like.
The air conditioning dehumidification method proposed by the present invention is described in detail in several embodiments below.
Example one
In this embodiment, the set loop temperature is 18 ℃, the low-temperature dew-point temperature threshold is 3 ℃, the first humidity difference node for distinguishing the efficient dehumidification from the energy-saving dehumidification is 10%, the first evaporation temperature Tl1 is the target evaporation temperature of the indoor heat exchanger during the efficient dehumidification, and the second evaporation temperature Tl2 is the target evaporation temperature of the indoor heat exchanger during the energy-saving dehumidification.
As shown in fig. 5, the method for controlling dehumidification of an air conditioner according to this embodiment includes:
step S51: and acquiring the ambient temperature and the ambient humidity, and calculating the dew point temperature based on the ambient temperature and the ambient humidity.
The method comprises the steps of obtaining an ambient temperature Ti and an ambient humidity RHi through a temperature sensor and a humidity sensor, and obtaining a current dew point temperature Td through table look-up, formula calculation and the like according to the obtained Ti and RHi.
Step S52: and when the ambient temperature is greater than or equal to the set ambient temperature, calculating the humidity difference between the ambient humidity and the set humidity.
And when the ambient temperature Ti is more than or equal to 18 ℃, calculating the humidity difference value delta RH between the ambient humidity Rhi and the set humidity RHS.
The humidity difference Δ RH is compared with the first humidity difference node (10%), and when the humidity difference Δ RH >10%, step S53 is performed, and when the humidity difference Δ RH <10%, step S54 is performed, and when the humidity difference Δ RH =0, step S55 is performed.
Step S53: and when the humidity difference value is greater than the first humidity difference value node, the first evaporation temperature is taken as the target evaporation temperature of the indoor heat exchanger, the frequency-rising operation of the compressor is controlled, and the high-wind-speed operation of the indoor fan is controlled.
When the delta RH is larger than 10%, efficient dehumidification control is performed, taking Tl1=7 ℃ as an example, 7 ℃ is set as the target evaporation temperature of the indoor heat exchanger, when the environment temperature is higher than 18 ℃, the dew point temperature is far higher than 7 ℃, and efficient dehumidification is achieved by dynamically controlling the frequency increase of the compressor and the high-wind-speed operation of the indoor fan, so that the evaporation temperature is rapidly reduced, and the air circulation speed is increased.
Step S54: and when the humidity difference value is smaller than the first humidity difference value node, the second evaporation temperature is taken as the target evaporation temperature of the indoor heat exchanger, the compressor is controlled to operate in a frequency reduction mode, and the indoor fan is controlled to operate at a low wind speed.
And when the Δ RH is less than 10%, performing energy-saving dehumidification control, in this embodiment, setting the second evaporation temperature Tl2 to be slightly less than the dew point temperature Td, taking Tl2= Td-1 as an example, and setting the second evaporation temperature to be the target evaporation temperature of the indoor heat exchanger, and realizing energy-saving dehumidification and ensuring dehumidification effect by dynamically controlling the compressor to reduce frequency and the indoor fan to operate at low wind speed.
Step S55: when the humidity difference is equal to zero, the dehumidification control is stopped.
When the humidity difference Δ RH =0, the system controls the dehumidification control to stop operating.
After any one of the steps from the step S53 to the step S55 is executed, the ambient temperature and the ambient humidity are detected again, and the above steps are repeatedly executed to realize uninterrupted dynamic dehumidification.
Step S56: and when the environment temperature is lower than the set ring temperature, comparing the dew point temperature with a low-temperature dew point temperature threshold value.
And when the ambient temperature Ti is less than the set ambient temperature of 18 ℃, executing low-temperature dynamic dehumidification control, and further taking a low-temperature dew point temperature threshold of 3 ℃ as a node in the low-temperature dynamic dehumidification control to distinguish uninterrupted low-temperature dynamic dehumidification control and intermittent dehumidification control.
Step S57: and when the dew point temperature is greater than or equal to the low-temperature dew point temperature threshold, controlling the frequency of the compressor and the wind speed of the indoor fan based on the humidity difference value of the environmental humidity and the set humidity.
The control of low-temperature dynamic dehumidification is basically the same as that of normal-temperature dynamic dehumidification, and the difference is that the target evaporation temperature of the indoor heat exchanger under the low-temperature dynamic dehumidification working condition is different from that of the indoor heat exchanger under the normal-temperature dynamic dehumidification working condition in the aspects of compressor frequency Fi control and air speed F control of an indoor fan.
Step S58: and when the dew point temperature is less than the low-temperature dew point temperature threshold value, executing intermittent dehumidification control.
Example two
In this embodiment, the given set loop temperature is 18 ℃, the low-temperature dew point temperature threshold is 3 ℃, the second humidity difference node for distinguishing high-efficiency dehumidification from energy-saving dehumidification in the low-temperature dynamic dehumidification control is 10%, the third evaporation temperature Tl3 is the target evaporation temperature of the indoor heat exchanger during high-efficiency dehumidification in the low-temperature dynamic dehumidification control, and the fourth evaporation temperature Tl4 is the target evaporation temperature of the indoor heat exchanger during energy-saving dehumidification in the low-temperature dynamic dehumidification control.
As shown in fig. 6, the air conditioner dehumidification control method provided by this embodiment includes:
step S61: and acquiring the ambient temperature and the ambient humidity, and calculating the dew point temperature based on the ambient temperature and the ambient humidity.
The method comprises the steps of obtaining an ambient temperature Ti and an ambient humidity RHi through a temperature sensor and a humidity sensor, and obtaining a current dew point temperature Td through table look-up, formula calculation and the like according to the obtained Ti and RHi.
Step S62: and when the ambient temperature is greater than or equal to the set ambient temperature, calculating the humidity difference between the ambient humidity and the set humidity.
And when the ambient temperature Ti is more than or equal to 18 ℃, calculating the humidity difference value delta RH between the ambient humidity Rhi and the set humidity RHS.
The humidity difference Δ RH is compared with the first humidity difference node (10%), and when the humidity difference Δ RH >10%, step S63 is performed, and when the humidity difference Δ RH <10%, step S64 is performed, and when the humidity difference Δ RH =0, step S65 is performed.
Step S63: and when the humidity difference value is greater than the first humidity difference value node, the first evaporation temperature is taken as the target evaporation temperature of the indoor heat exchanger, the frequency-rising operation of the compressor is controlled, and the high-wind-speed operation of the indoor fan is controlled.
Refer specifically to step S53 in embodiment one.
Step S64: and when the humidity difference value is smaller than the first humidity difference value node, the second evaporation temperature is taken as the target evaporation temperature of the indoor heat exchanger, the compressor is controlled to operate in a frequency reduction mode, and the indoor fan is controlled to operate at a low wind speed.
Refer specifically to step S54 in embodiment one.
Step S65: when the humidity difference is equal to zero, the dehumidification control is stopped.
Refer specifically to step S55 of the first embodiment.
After any one of the steps from the step S63 to the step S65 is executed, the ambient temperature and the ambient humidity are detected again, and the above steps are repeatedly executed to realize uninterrupted dynamic dehumidification.
Step S66: and when the environment temperature is lower than the set ring temperature, comparing the dew point temperature with a low-temperature dew point temperature threshold value.
And when the ambient temperature Ti is less than the set ambient temperature of 18 ℃, executing low-temperature dynamic dehumidification control, and further taking a low-temperature dew point temperature threshold of 3 ℃ as a node in the low-temperature dynamic dehumidification control to distinguish uninterrupted low-temperature dynamic dehumidification control and intermittent dehumidification control.
Step S67: and when the dew point temperature is greater than or equal to the low-temperature dew point temperature threshold value, calculating the humidity difference between the environmental humidity and the set humidity.
And when the ambient temperature Ti is less than 18 ℃ and the dew point temperature Td is more than or equal to 3 ℃, calculating the humidity difference value delta RH between the ambient humidity Rhi and the set humidity RHS.
The humidity difference Δ RH is compared with the second humidity difference node (10%), and when the humidity difference Δ RH >10%, step S68 is performed, and when the humidity difference Δ RH <10%, step S69 is performed, and when the humidity difference Δ RH =0, step S70 is performed.
Step S68: and when the humidity difference value is larger than the second humidity difference value node, the third evaporation temperature is taken as the target evaporation temperature of the indoor heat exchanger, the compressor is controlled to operate in an up-conversion mode, and the indoor fan is controlled to operate at a high wind speed.
When the delta RH is more than 10%, performing high-efficiency dehumidification control under low-temperature dynamic dehumidification, taking Tl3=2 ℃ as an example, setting 2 ℃ as a target evaporation temperature of the indoor heat exchanger, and when the ambient temperature is lower than 18 ℃ and the dew point temperature is higher than 3 ℃, achieving quick reduction of the evaporation temperature and acceleration of the air circulation speed to achieve high-efficiency dehumidification by dynamically controlling the frequency increase of the compressor and the high-speed operation of the indoor fan.
Step S69: and when the humidity difference value is smaller than the second humidity difference value node, the fourth evaporation temperature is taken as the target evaporation temperature of the indoor heat exchanger, the compressor is controlled to operate in a frequency reduction mode, and the indoor fan is controlled to operate at a low wind speed.
When Δ RH is less than 10%, performing energy-saving dehumidification control under low-temperature dynamic dehumidification control, in this embodiment, the fourth evaporation temperature Tl4 is slightly less than the dew point Td, taking Tl4= Td-1 as an example, and is set as the target evaporation temperature of the indoor heat exchanger, and by dynamically controlling the compressor to reduce frequency and the indoor fan to operate at low wind speed, implementing energy-saving dehumidification and ensuring dehumidification effect
Step S70: when the humidity difference is equal to zero, the dehumidification control is stopped.
When the humidity difference Δ RH =0, the system control stops the dehumidification control.
After any one of the steps from the step S68 to the step S70 is executed, the ambient temperature and the ambient humidity are detected again, and the above steps are repeatedly executed to realize uninterrupted dynamic dehumidification.
Step S71: and when the dew point temperature is less than the low-temperature dew point temperature threshold value, executing intermittent dehumidification control.
In order to support the above-mentioned proposed air conditioner dehumidification control method, the present invention further proposes an air conditioner dehumidification system, as shown in fig. 7, the system includes:
a compressor 1 and an indoor fan 2.
And the temperature sensor 3 is arranged at an air return inlet of the air conditioner and used for detecting the ambient temperature.
And the humidity sensor 4 is arranged at an air return inlet of the air conditioner and is used for detecting the environmental humidity.
And the acquisition module 5 is contained in the air conditioner controller and is used for acquiring the ambient temperature and the ambient humidity.
And the dew point temperature calculation module 6 is contained in the air conditioner controller and used for calculating the dew point temperature based on the ambient temperature and the ambient humidity.
And the dynamic dehumidification control module 7 is contained in the air conditioner controller and is used for controlling the frequency of the compressor 1 and the wind speed of the indoor fan 2 based on the humidity difference value between the ambient humidity and the set humidity when the ambient temperature is greater than or equal to the set ambient temperature.
The low-temperature dynamic dehumidification control module 8 is contained in the air conditioner controller and is used for controlling the frequency of the compressor and the wind speed of the indoor fan based on the humidity difference value of the environment humidity and the set humidity if the dew point temperature is greater than or equal to the low-temperature dew point temperature threshold when the environment temperature is less than the set environment temperature; and if the dew point temperature is less than the low-temperature dew point temperature threshold value, executing intermittent dehumidification control.
In the embodiment shown in fig. 8, the dynamic dehumidification control module 7 in the air conditioning dehumidification system proposed by the present invention comprises:
and the high-efficiency dehumidification unit 71 is used for controlling the compressor 1 to operate in an up-conversion mode and controlling the indoor fan 2 to operate at a high wind speed by taking the first evaporation temperature as the target evaporation temperature of the indoor heat exchanger when the humidity difference value is greater than the first humidity difference value node.
The energy-saving dehumidification unit 72 is used for controlling the compressor 1 to operate in a frequency-reducing mode and controlling the indoor fan 2 to operate at a low wind speed by taking the second evaporation temperature as the target evaporation temperature of the indoor heat exchanger when the humidity difference value is smaller than the first humidity difference value node; when the humidity difference is equal to zero, the dehumidification control is stopped.
In the embodiment shown in fig. 9, the low-temperature dynamic dehumidification control module 8 in the air conditioning dehumidification system according to the present invention includes:
and the low-temperature high-efficiency dehumidification unit 81 is used for controlling the compressor 1 to run in an up-conversion mode and controlling the indoor fan 2 to run at a high wind speed by taking the third evaporation temperature as the target evaporation temperature of the indoor heat exchanger when the humidity difference value is greater than the second humidity difference value node.
The low-temperature energy-saving dehumidification unit 82 is used for controlling the compressor 1 to operate in a frequency-reducing mode and controlling the indoor fan 2 to operate at a low wind speed by taking the fourth evaporation temperature as the target evaporation temperature of the indoor heat exchanger when the humidity difference value is smaller than the second humidity difference value node; when the humidity difference is equal to zero, the dehumidification control is stopped.
In the embodiment shown in fig. 10, the low-temperature dynamic dehumidification control module 8 in the air conditioning dehumidification system according to the present invention further includes:
an intermittent dehumidification control unit 83 for performing intermittent dehumidification control; wherein the intermittent dehumidification control includes the following steps that are cyclically executed: controlling the compressor to run in an up-conversion mode and controlling the indoor fan to run at a low wind speed by taking the temperature lower than the dew point as the target evaporation temperature of the indoor heat exchanger; and after the first set time, controlling the compressor and the indoor fan to stop running for a second set time.
In the embodiment shown in fig. 11, the air conditioning dehumidification system further includes a dehumidification limiting module 9, configured to control the target evaporation temperature of the indoor heat exchanger to be less than the dew point temperature when the dynamic dehumidification control module 7 or the low-temperature dynamic dehumidification module 8 controls the frequency of the compressor and the control of the wind speed of the indoor fan based on the humidity difference between the ambient humidity and the set humidity.
It should be noted that, in a specific implementation process, the control part may be implemented by a processor in a hardware form executing a computer execution instruction in a software form stored in a memory, which is not described herein, and all programs corresponding to actions executed by the control part may be stored in a computer readable storage medium of the system in a software form, so that the processor can call and execute operations corresponding to the above modules.
The computer-readable storage media above may include volatile memory, such as random access memory; non-volatile memory, such as read-only memory, flash memory, a hard disk, or a solid state disk; combinations of the above categories of memory may also be included.
The processor referred to above may also be referred to collectively as a plurality of processing elements. For example, the processor may be a central processing unit, but may also be other general purpose processors, digital signal processors, application specific integrated circuits, field programmable gate arrays or other programmable logic devices, discrete gate or transistor logic, discrete hardware components, or the like. A general-purpose processor may be a microprocessor, or may be any conventional processor or the like, or may be a special-purpose processor.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. The air conditioner dehumidification control method is characterized by comprising the following steps of circularly executing:
acquiring the ambient temperature and the ambient humidity;
calculating a dew point temperature based on the ambient temperature and the ambient humidity;
when the ambient temperature is greater than or equal to the set ambient temperature, controlling the frequency of the compressor and the air speed of the indoor fan based on the humidity difference value of the ambient humidity and the set humidity;
when the environmental temperature is lower than the set environmental temperature, if the dew point temperature is higher than or equal to the low-temperature dew point temperature threshold, controlling the frequency of the compressor and the wind speed of the indoor fan based on the humidity difference value of the environmental humidity and the set humidity; and if the dew point temperature is less than the low-temperature dew point temperature threshold value, executing intermittent dehumidification control.
2. The air conditioner dehumidification control method according to claim 1, wherein when the ambient temperature is greater than or equal to the set ambient temperature, controlling the frequency of the compressor and the wind speed of the indoor fan based on a humidity difference between the ambient humidity and the set humidity specifically comprises:
when the humidity difference is larger than a first humidity difference node, the first evaporation temperature is taken as the target evaporation temperature of the indoor heat exchanger, the frequency-rising operation of the compressor is controlled, and the high-wind-speed operation of the indoor fan is controlled;
when the humidity difference is smaller than the first humidity difference node, the second evaporation temperature is taken as the target evaporation temperature of the indoor heat exchanger, the compressor is controlled to operate in a frequency reduction mode, and the indoor fan is controlled to operate at a low wind speed;
and when the humidity difference value is equal to zero, stopping the operation of the dehumidification control.
3. The air conditioner dehumidification control method according to claim 1, wherein when the ambient temperature is less than the set temperature and the dew point temperature is greater than or equal to the low-temperature dew point temperature threshold, controlling the frequency of the compressor and the wind speed of the indoor fan based on a humidity difference between the ambient humidity and the set humidity specifically comprises:
when the humidity difference is larger than the second humidity difference node, the third evaporation temperature is taken as the target evaporation temperature of the indoor heat exchanger, the compressor is controlled to operate in an up-conversion mode, and the indoor fan is controlled to operate at a high wind speed;
when the humidity difference value is smaller than the second humidity difference value node, taking the fourth evaporation temperature as the target evaporation temperature of the indoor heat exchanger, controlling the compressor to operate in a frequency reduction mode, and controlling the indoor fan to operate at a low wind speed;
and when the humidity difference value is equal to zero, stopping the operation of the dehumidification control.
4. The air conditioner dehumidification control method according to claim 1, wherein when the ambient temperature is less than the set temperature and the dew point temperature is less than the low-temperature dew point temperature threshold, performing intermittent dehumidification control, specifically comprising the following steps performed in a cyclic manner:
controlling the compressor to run in an up-conversion mode and controlling the indoor fan to run at a low wind speed by taking the temperature lower than the dew point temperature as the target evaporation temperature of the indoor heat exchanger;
and after the first set time, controlling the compressor and the indoor fan to stop running for a second set time.
5. The air conditioning dehumidification control method of claim 1, wherein in the control of controlling the frequency of the compressor and the wind speed of the indoor fan based on a humidity difference between an ambient humidity and a set humidity, the method further comprises:
and controlling the target evaporation temperature of the indoor heat exchanger to be less than the dew point temperature.
6. An air conditioning dehumidification system comprising:
a compressor and an indoor fan;
the temperature sensor is arranged at an air return inlet of the air conditioner and used for detecting the ambient temperature;
the humidity sensor is arranged at an air return inlet of the air conditioner and used for detecting the environmental humidity;
it is characterized by also comprising:
the acquisition module is used for acquiring the ambient temperature and the ambient humidity;
the dew point temperature calculation module is used for calculating the dew point temperature based on the environment temperature and the environment humidity;
the dynamic dehumidification control module is used for controlling the frequency of the compressor and the air speed of the indoor fan based on the humidity difference value of the environment humidity and the set humidity when the environment temperature is greater than or equal to the set environment temperature;
the low-temperature dynamic dehumidification control module is used for controlling the frequency of the compressor and the wind speed of the indoor fan based on the humidity difference value of the environment humidity and the set humidity if the dew point temperature is greater than or equal to the low-temperature dew point temperature threshold when the environment temperature is lower than the set environment temperature; and if the dew point temperature is less than the low-temperature dew point temperature threshold value, executing intermittent dehumidification control.
7. An air conditioning dehumidification system according to claim 6, wherein said dynamic dehumidification control module comprises:
the efficient dehumidification unit is used for controlling the compressor to perform frequency-up operation and controlling the indoor fan to perform high-wind-speed operation by taking the first evaporation temperature as the target evaporation temperature of the indoor heat exchanger when the humidity difference value is larger than the first humidity difference value node;
the energy-saving dehumidification unit is used for controlling the compressor to operate in a frequency reduction mode and controlling the indoor fan to operate at a low wind speed by taking the second evaporation temperature as the target evaporation temperature of the indoor heat exchanger when the humidity difference value is smaller than the first humidity difference value node;
and when the humidity difference value is equal to zero, stopping the operation of the dehumidification control.
8. The air conditioning dehumidification system of claim 6, wherein said low temperature dynamic dehumidification control module comprises:
the low-temperature efficient dehumidification unit is used for controlling the compressor to run in an up-conversion mode and controlling the indoor fan to run at a high wind speed by taking the third evaporation temperature as the target evaporation temperature of the indoor heat exchanger when the humidity difference value is larger than the second humidity difference value node;
the low-temperature energy-saving dehumidification unit is used for controlling the compressor to operate in a frequency reduction mode and controlling the indoor fan to operate at a low wind speed by taking the fourth evaporation temperature as the target evaporation temperature of the indoor heat exchanger when the humidity difference value is smaller than the second humidity difference value node;
and when the humidity difference value is equal to zero, stopping the operation of the dehumidification control.
9. The air conditioning dehumidification system of claim 6, wherein said low temperature dynamic dehumidification control module comprises:
an intermittent dehumidification control unit for performing intermittent dehumidification control; the intermittent dehumidification control includes the following steps that are cyclically executed:
controlling the compressor to run in an up-conversion mode and controlling the indoor fan to run at a low wind speed by taking the temperature lower than the dew point temperature as the target evaporation temperature of the indoor heat exchanger;
and after the first set time, controlling the compressor and the indoor fan to stop running for a second set time.
10. The air conditioning dehumidification system of claim 6, further comprising a dehumidification definition module for controlling an indoor heat exchanger target evaporation temperature to be less than a dew point temperature when the dynamic dehumidification control module or the low temperature dynamic dehumidification module controls the frequency of the compressor and the control of the wind speed of the indoor fan based on a humidity difference of the ambient humidity and the set humidity.
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