CN115235000B - Dehumidifier and control method thereof - Google Patents

Dehumidifier and control method thereof Download PDF

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Publication number
CN115235000B
CN115235000B CN202210907071.4A CN202210907071A CN115235000B CN 115235000 B CN115235000 B CN 115235000B CN 202210907071 A CN202210907071 A CN 202210907071A CN 115235000 B CN115235000 B CN 115235000B
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China
Prior art keywords
temperature
compressor
fan
frequency
preset
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CN202210907071.4A
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Chinese (zh)
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CN115235000A (en
Inventor
王美霞
李伟宁
郭盛
刘丹华
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Hisense Guangdong Air Conditioning Co Ltd
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Hisense Guangdong Air Conditioning Co Ltd
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F3/00—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems
    • F24F3/12—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the treatment of the air otherwise than by heating and cooling
    • F24F3/14—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the treatment of the air otherwise than by heating and cooling by humidification; by dehumidification
    • 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
    • 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
    • F24F11/70—Control systems characterised by their outputs; Constructional details thereof
    • 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
    • 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
    • F24F11/89—Arrangement or mounting of control or safety devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
    • F24F13/08—Air-flow control members, e.g. louvres, grilles, flaps or guide plates
    • F24F13/082—Grilles, registers or guards
    • 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
    • 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 discloses a dehumidifier and a control method thereof, wherein the running frequency of a compressor and a fan is controlled according to the comparison relation between the temperature difference of the ambient dew point temperature and the evaporator temperature and the difference interval by presetting the difference interval of the ambient dew point temperature and the evaporator temperature, so that the running frequency of the compressor and the running frequency of the fan are dynamically adjusted. In addition, the scheme can realize that one press operating frequency corresponds to one group of fan operating frequencies, more accurate adjustment of the temperature of the evaporator can be realized through adjustment of the wind speed when the compressor operating frequency is unchanged, the control method is efficient and energy-saving, is suitable for machine types with different nominal dehumidification amounts, does not need to carry out a large number of experiments on new machine types, and realizes intelligent lifting of the machine.

Description

Dehumidifier and control method thereof
Technical Field
The invention relates to the technical field of dehumidifiers, in particular to a dehumidifier and a control method thereof.
Background
With the improvement of the quality of living standard of people, the daily demands of people for dehumidifying, drying, ventilating and keeping warm in living environment are gradually becoming, and a dehumidifier is a household appliance device which sucks air in a specific space and removes moisture contained in the air, and discharges the air from which the moisture is removed to the specific space, thereby keeping the air in the specific space dry. At present, the operation frequencies of the compressor and the fan corresponding to the ambient temperature and the ambient humidity are obtained by a large number of experiments in advance by the traditional variable-frequency dehumidifier, so that when the temperature and the humidity reach the corresponding conditions, the operation of the compressor and the fan is controlled according to preset parameters. However, dehumidifiers with different nominal dehumidification amounts require a large number of experiments to determine their correspondence, making the process of presetting parameters cumbersome and complex.
Disclosure of Invention
The embodiment of the invention aims to provide a dehumidifier and a control method thereof, wherein the dynamic adjustment of the compressor operating frequency and the fan operating frequency is realized through presetting a difference value interval between the ambient dew point temperature and the evaporator temperature, and the compressor operating frequency corresponds to a group of fan operating frequencies, so that the temperature of the evaporator can be more accurately adjusted through the adjustment of the wind speed when the compressor operating frequency is unchanged.
To achieve the above object, an embodiment of the present invention provides a dehumidifier including:
the dehumidification system is used for adjusting the humidity of indoor air and comprises a compressor, a condenser, an evaporator and a fan which are arranged in the shell of the dehumidifier;
the detection device comprises an environment temperature sensor for detecting the temperature of an environment dry bulb, an evaporator temperature sensor for detecting the temperature of an evaporator and an environment humidity sensor for detecting the relative humidity of the environment;
and the controller is used for controlling the compressor and the fan to operate according to the preset frequency of the dehumidification system after the dehumidifier is started, calculating the ambient dew point temperature according to the ambient dry bulb temperature and the ambient relative humidity after the dehumidification system meets the preset stable operation condition, calculating the temperature difference between the ambient dew point temperature and the evaporator temperature, and controlling the frequency of the compressor and the fan to be maintained at the preset frequency when the temperature difference is smaller than or equal to a high-temperature threshold and larger than a low-temperature threshold.
As an improvement of the above scheme, the stable operation condition is: the operation time of the dehumidification system after the dehumidifier is started reaches a first preset time; the first preset duration is a duration predicted by a laboratory when the evaporator temperature reaches the corresponding optimal evaporator temperature under the current environmental factors.
As an improvement of the above solution, the controller is further configured to:
when the control duration of controlling the frequency of the compressor and the frequency of the fan to be maintained at the preset frequency reaches a second preset duration, acquiring the environment relative humidity;
reducing the operating frequency of the compressor and the blower when the ambient relative humidity is equal to a set humidity of the dehumidification system;
when the ambient relative humidity is less than the set humidity of the dehumidification system, controlling the compressor to stop and reducing the running frequency of the fan;
when the ambient relative humidity is greater than the set humidity of the dehumidification system, the dew point temperature is recalculated.
As an improvement of the above solution, the controller is further configured to:
reducing the operating frequency of the compressor and the fan when the temperature difference is greater than the high temperature threshold;
After the operating frequencies of the compressor and the fan are reduced, when the temperature fluctuation value of the evaporator temperature is not higher than a preset temperature fluctuation threshold value within a preset duration, if the temperature difference is still higher than the high temperature threshold value, controlling the frequency of the compressor to be kept unchanged at the current operating frequency, and improving the operating frequency of the fan;
and after the operating frequency of the fan is increased, when the temperature fluctuation value of the evaporator temperature is not higher than a preset temperature fluctuation threshold value within a preset duration, if the temperature difference is still higher than the high temperature threshold value, the operating frequency of the compressor and the fan is reduced.
As an improvement of the above solution, the controller is further configured to:
when the temperature difference is less than or equal to the low temperature threshold, increasing the operating frequency of the compressor and the fan;
after the operating frequencies of the compressor and the fan are increased, when the temperature fluctuation value of the evaporator temperature is not higher than a preset temperature fluctuation threshold value within a preset duration, if the temperature difference is still smaller than or equal to the low temperature threshold value, controlling the frequency of the compressor to be unchanged at the current operating frequency, and reducing the operating frequency of the fan;
And after the operating frequency of the fan is reduced, when the temperature fluctuation value of the temperature of the evaporator is not higher than a preset temperature fluctuation threshold value within a preset duration, if the temperature difference is still higher than the high temperature threshold value, the operating frequency of the compressor and the fan is increased.
In order to achieve the above object, an embodiment of the present invention further provides a dehumidifier control method, including:
after the dehumidifier is started, controlling a compressor and the fan in the dehumidifier to operate according to the preset frequency of a dehumidification system;
after the dehumidification system meets preset stable operation conditions, calculating an environmental dew point temperature according to an environmental dry bulb temperature and an environmental relative humidity;
calculating a temperature difference between the ambient dew point temperature and the evaporator temperature;
and when the temperature difference is smaller than or equal to a high temperature threshold value and is larger than a low temperature threshold value, controlling the frequency of the compressor and the frequency of the fan to be maintained at the preset frequency.
As an improvement of the above scheme, the stable operation condition is: the operation time of the dehumidification system after the dehumidifier is started reaches a first preset time; the first preset duration is a duration predicted by a laboratory when the evaporator temperature reaches the corresponding optimal evaporator temperature under the current environmental factors.
As an improvement of the above solution, the method further includes:
when the control duration of controlling the frequency of the compressor and the frequency of the fan to be maintained at the preset frequency reaches a second preset duration, acquiring the environment relative humidity;
reducing the operating frequency of the compressor and the blower when the ambient relative humidity is equal to a set humidity of the dehumidification system;
when the ambient relative humidity is less than the set humidity of the dehumidification system, controlling the compressor to stop and reducing the running frequency of the fan;
when the ambient relative humidity is greater than the set humidity of the dehumidification system, the dew point temperature is recalculated.
As an improvement of the above solution, the method further includes:
reducing the operating frequency of the compressor and the fan when the temperature difference is greater than the high temperature threshold;
after the operating frequencies of the compressor and the fan are reduced, when the temperature fluctuation value of the evaporator temperature is not higher than a preset temperature fluctuation threshold value within a preset duration, if the temperature difference is still higher than the high temperature threshold value, controlling the frequency of the compressor to be kept unchanged at the current operating frequency, and improving the operating frequency of the fan;
And after the operating frequency of the fan is increased, when the temperature fluctuation value of the evaporator temperature is not higher than a preset temperature fluctuation threshold value within a preset duration, if the temperature difference is still higher than the high temperature threshold value, the operating frequency of the compressor and the fan is reduced.
As an improvement of the above solution, the method further includes:
when the temperature difference is less than or equal to the low temperature threshold, increasing the operating frequency of the compressor and the fan;
after the operating frequencies of the compressor and the fan are increased, when the temperature fluctuation value of the evaporator temperature is not higher than a preset temperature fluctuation threshold value within a preset duration, if the temperature difference is still smaller than or equal to the low temperature threshold value, controlling the frequency of the compressor to be unchanged at the current operating frequency, and reducing the operating frequency of the fan;
and after the operating frequency of the fan is reduced, when the temperature fluctuation value of the temperature of the evaporator is not higher than a preset temperature fluctuation threshold value within a preset duration, if the temperature difference is still higher than the high temperature threshold value, the operating frequency of the compressor and the fan is increased.
Compared with the prior art, the dehumidifier and the control method thereof disclosed by the embodiment of the invention control the operating frequencies of the compressor and the fan according to the comparison relation between the temperature difference of the ambient dew point temperature and the evaporator temperature and the difference interval by presetting the difference interval of the ambient dew point temperature and the evaporator temperature, thereby realizing the dynamic adjustment of the operating frequencies of the compressor and the fan. In addition, the scheme can realize that one press operating frequency corresponds to one group of fan operating frequencies, more accurate adjustment of the temperature of the evaporator can be realized through adjustment of the wind speed when the compressor operating frequency is unchanged, the control method is efficient and energy-saving, is suitable for machine types with different nominal dehumidification amounts, does not need to carry out a large number of experiments on new machine types, and realizes intelligent lifting of the machine.
Drawings
Fig. 1 is a schematic view of an external structure of a dehumidifier according to an embodiment of the present invention;
FIG. 2 is a schematic view of a dehumidifier when the water tank is taken out according to an embodiment of the present invention;
FIG. 3 is a schematic back view of a dehumidifier according to an embodiment of the present invention;
FIG. 4 is a schematic view of the internal structure of the dehumidifier when the back plate is removed according to the embodiment of the present invention;
FIG. 5 is a schematic view of the internal structure of the dehumidifier when the front plate and the water tank are removed according to the embodiment of the present invention;
FIG. 6 is a first workflow diagram of a controller provided by an embodiment of the present invention;
FIG. 7 is a second workflow diagram of a controller provided by an embodiment of the present invention;
FIG. 8 is a third workflow diagram of a controller provided by an embodiment of the present invention;
FIG. 9 is a fourth operational flow diagram of a controller provided by an embodiment of the present invention;
fig. 10 is a flowchart of a dehumidifier control method according to an embodiment of the present invention.
Wherein, 100, dehumidifier; 1. a base; 2. a front plate; 3. a rear plate; 4. a top cover; 5. a water tank; 6. an air inlet part; 7. an evaporator; 8. a condenser; 9. a water receiving tray; 10. a compressor; 11. a blower; 11A, air outlet.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the description of the present application, it should be understood that the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, merely to facilitate description of the present application and simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present application.
The terms "first," "second," and the like, 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 defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present application, unless otherwise indicated, the meaning of "a plurality" is two or more.
In the description of the present application, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art in a specific context.
Referring to fig. 1 to 2, a dehumidifier 100 provided in an embodiment of the present invention includes: a housing and a water tank 5 detachably mounted on the housing, the housing may be constituted by a combination of a plurality of members, as shown in fig. 2, and the housing may include: a base 1 forming the bottom appearance of the dehumidifier 100; a front plate 2 partially forming the front surface appearance of the dehumidifier 100; a rear plate 3 partially forming a rear surface appearance of the dehumidifier 100; portions of the front plate 2 and the rear plate 3 together form a side appearance of the dehumidifier 100; and a top cover 4 forming an upper surface appearance of the dehumidifier 100.
The water tank 5 may be installed in front of the dehumidifier 100, the water tank 5 is installed on the base 1, the upper surface of the base 1 may be a water tank installation surface, and the water tank 5 is installed on the water tank installation surface. And when the insertion is completed, the front surface of the water tank 5 forms the front appearance of the dehumidifier 100 together with a portion of the front plate 1. When the water tank 5 is filled with condensed water, the user can remove the water tank 5 from the housing to empty the water tank 5, and then insert the water tank 5 back into the housing for installation. When the water tank 5 is installed, the water tank 5 may be inserted and accommodated in the tank space. The water tank 5 may have a shape in which a front surface, a rear surface, a left side surface, a right side surface, and a bottom surface are closed, and an upper portion of the water tank 5 may be formed with an opening portion. The entire upper surface of the water tank 5 may be opened to constitute an opening, or a part of the upper surface thereof may be closed, and the non-closed part constitutes an opening.
Referring to fig. 3, the rear plate 3 is provided with an air inlet portion 6 (air inlet grid) formed with a plurality of air inlets through which air is sucked; an air outlet (air outlet grid) is provided in the top cover 4, and the air dehumidified inside the dehumidifier 100 can be discharged to the outside through the air outlet. The dehumidifier 100 may suck air through the air inlet 6 on the back surface and may dehumidify the inside and then discharge the air through the air outlet on the upper surface.
Referring to fig. 4 to 5, the dehumidifier 100 may include a dehumidification system disposed inside the housing for adjusting humidity of indoor air, including an evaporator 7, a condenser 8, a compressor 10, and a blower 11 disposed inside the dehumidifier housing. Also, the dehumidifier 100 may include: the condensed water produced in the operation process of the dehumidification system drops onto the water receiving disc 9 to be gathered, and the water receiving disc 9 discharges the condensed water into the water tank 5.
The dehumidifier 100 of the embodiment of the present invention dehumidifies the indoor air by condensing (cooling the air to remove moisture using a similar technique to a refrigerator). The indoor space may be dehumidified by a dehumidification system including a compressor 10, a condenser 8, an expansion mechanism (not shown) and an evaporator 7, and the compressor 10, the condenser 8, the expansion mechanism and the evaporator 7 may be connected in this order by pipes to form a refrigerant circuit for circulating a refrigerant. The condenser 8 and the evaporator 7 are provided with a plurality of fins for exchanging heat between the refrigerant and air. The compressor 10 compresses the refrigerant sucked from the evaporator 7 and discharges the refrigerant to the condenser 8. The expansion mechanism reduces the pressure of the refrigerant flowing from the condenser 8 to the evaporator 7, and expands the refrigerant. The evaporator 7 exchanges heat between the air sucked from the space to be dehumidified and the refrigerant, thereby cooling the air. The condenser 8 heats the air by exchanging heat between the refrigerant and the dry air cooled by the evaporator 7, and the condenser 8 functions as a reheater in the dehumidifier 100. The blower 11 causes air outside the dehumidifier 100 to be discharged outside the dehumidifier 100 after sequentially passing through the evaporator 7 and the condenser 8, and may be located after the condenser 8 in the air flow direction. The fan 11 may be disposed on the upper side of the water tray 9. An air outlet 11A may be formed on the upper surface of the blower 11, and air may be discharged through the air outlet 11A and then through an air outlet portion provided in the top cover 4.
It should be noted that, in the embodiment of the present invention, a detection device (not shown in the figure) is further provided on the dehumidifier 100, where the detection device includes an ambient temperature sensor for detecting the temperature of the dry ambient bulb, an evaporator temperature sensor for detecting the temperature of the evaporator, and an ambient humidity sensor for detecting the relative humidity of the environment. The compressor 10 and the fan 11 according to the embodiment of the present invention may receive a control command from a controller in the dehumidifier, and further adjust the operation frequency thereof according to the control command.
Specifically, the controller is used for: after the dehumidifier is started, the compressor 10 and the fan 11 are controlled to operate according to the preset frequency of the dehumidification system, after the dehumidification system meets the preset stable operation condition, the ambient dew point temperature is calculated according to the ambient dry bulb temperature and the ambient relative humidity, the temperature difference between the ambient dew point temperature and the evaporator temperature is calculated, and when the temperature difference is smaller than or equal to a high temperature threshold and larger than a low temperature threshold, the frequencies of the compressor 10 and the fan 11 are controlled to be maintained at the preset frequency.
Referring to fig. 6, fig. 6 is a first workflow diagram of a controller according to an embodiment of the present invention, the controller being configured to perform steps S11 to S16:
S11, starting the dehumidifier, operating according to a set program, and then entering step S12.
Illustratively, after the variable frequency dehumidifier is started, the compressor 10 and the blower 11 are gradually operated in an up-conversion mode, and then enter a steady state. At this time, the ambient dry bulb temperature, the ambient relative humidity, and the evaporator temperature are obtained together.
And S12, judging whether the dehumidification system meets the stable operation condition, if so, entering a step S13, and if not, continuing to execute the step S12.
Illustratively, the steady operating conditions are: the operation time of the dehumidification system after the dehumidifier is started reaches a first preset time; the first preset duration is a duration predicted by a laboratory when the evaporator temperature reaches the corresponding optimal evaporator temperature under the current environmental factors.
And S13, calculating an ambient dew point temperature according to the ambient dry bulb temperature and the ambient relative humidity, and then entering step S14.
S14, calculating the ambient dew point temperature T 0L And the evaporator temperature T Z Temperature difference Δt of Δt=t 0L -T Z Then, the process advances to step S15.
S15, judging whether Tmin < DeltaT is less than or equal to Tmax, if so, proceeding to step S16, otherwise, executing other control logic, such as subsequent steps S151-S157 or steps S61-S167.
The temperature range is formed by Tmax and Tmin, the values of Tmax and Tmin are determined by the current environment dew point temperature, and different environment dew point temperatures are correspondingly preset with different optimal evaporator temperatures.
S16, when Tmin < DeltaT is less than or equal to Tmax, controlling the frequencies of the compressor 10 and the fan 11 to be maintained at the preset frequency. It is explained that the optimal evaporation temperature exists in the dehumidification system, and the efficient dehumidification effect is achieved, and then the compressor 10 and the fan 11 respectively operate at the current frequency.
For example, assuming that the ambient dry bulb temperature range is (18 ℃,20 ℃) and the ambient relative humidity range is (50%, 60%), the preset ambient dew point temperature range is defined (13 ℃,15 ℃) according to the physical property parameters of the air, and the preset optimal evaporator temperature range corresponding to the ambient dew point temperature range (13 ℃,15 ℃) is defined (5 ℃,8 ℃) according to the analysis of experimental results]Tmin=5 ℃, tmax=8 ℃, Δt e (5, 8]If the evaporator temperature T at the moment is detected Z Ambient dew point temperature T =8℃ 0L =14 ℃, Δt=t 0L -T Z =6deg.C, meet Tmin<And delta T is less than or equal to Tmax, the frequency of the compressor 10 and the frequency of the fan 11 are kept unchanged.
In the embodiment of the invention, the corresponding optimal evaporator temperatures under different environment dry bulb temperatures and environment relative humidity can be obtained through a dehumidification amount experiment, so that efficient dehumidification is realized, namely, m preset environment dry bulb temperature intervals and n preset environment relative humidity intervals can be stored in a storage module of the dehumidifier through arrangement and analysis of experimental data, p preset environment dew point temperature intervals and p preset optimal evaporator temperature intervals are obtained, p preset temperature difference intervals are finally obtained, and the data in the storage module is obtained based on the principle that the evaporator temperature is lower than the dew point temperature, so that the dehumidifier has strong adaptability, can be suitable for dehumidifier types with different nominal dehumidification amounts, does not need to carry out a large number of experiments for new types, and is used for intelligent promotion of a control method.
Specifically, the controller is further configured to: acquiring the environment relative humidity after a control duration for controlling the frequency of the compressor 10 and the fan 11 to be maintained at the preset frequency reaches a second preset duration; reducing the operating frequency of the compressor 10 and the blower 11 when the ambient relative humidity is equal to the set humidity of the dehumidification system; when the ambient relative humidity is less than the set humidity of the dehumidification system, controlling the compressor 10 to stop and reducing the operating frequency of the fan 11; when the ambient relative humidity is greater than the set humidity of the dehumidification system, the dew point temperature is recalculated.
Referring to fig. 7, fig. 7 is a second workflow diagram of the controller according to the embodiment of the present invention, wherein after step S16 is performed, the controller is further configured to perform steps S17 to S22:
s17, accumulating the control duration of the controller for controlling the frequency of the compressor 10 and the fan 11 to be maintained at the preset frequency, and then proceeding to step S18.
And S18, judging whether the control duration reaches a second preset duration, if so, entering a step S19, and if not, re-executing the step S18.
And S19, acquiring the environment relative humidity when the control time length reaches the second preset time length, and then entering into steps S20, S21 or S22.
And S20, when the ambient relative humidity is equal to the set humidity of the dehumidification system, reducing the operation frequency of the compressor 10 and the fan 11.
And S21, when the ambient relative humidity is smaller than the set humidity of the dehumidification system, controlling the compressor 10 to stop and reducing the operating frequency of the fan 11.
S22, when the ambient relative humidity is greater than the set humidity of the dehumidification system, recalculating the dew point temperature.
Illustratively, when Tmin < ΔT+.ltoreq.Tmax is satisfied, the compressor 10 and the blower 11 are each operated at the current frequency. The second preset time length is set to a fixed value generally when the dehumidification system runs at the optimal evaporation temperature, and the environment dry-bulb temperature and the environment relative humidity are in dynamic change within the second preset time length, so that humidity judgment logic needs to be entered after the second preset time length, and whether the current environment relative humidity meets the requirement of a user set value or not is judged. If the ambient relative humidity reaches the set humidity of the machine, the compressor 10 and the fan 11 operate at a preset lower frequency, and small fluctuation of the ambient relative humidity is maintained; if the ambient relative humidity is still higher than the set humidity of the machine, detecting the ambient dry bulb temperature and the ambient relative humidity again, calculating the ambient dew point temperature, detecting the evaporator temperature at the same time, further obtaining the temperature difference delta T between the ambient dew point temperature and the evaporator temperature, further judging the relation between the delta T and the corresponding Tmin and Tmax under the working condition, and continuously circulating until the ambient relative humidity reaches the set humidity of the machine; if the relative humidity of the environment is lower than the machine set humidity, the compressor 10 is shut down and the fan 11 is operated at a preset lower frequency. Through presetting a difference value interval between the ambient dew point temperature and the evaporator temperature, the relationship between the actual difference value between the ambient dew point temperature and the evaporator temperature and the preset value is circularly judged, and the operation frequency of the compressor 10 and the operation frequency of the fan 11 are dynamically regulated in real time, so that efficient dehumidification is realized.
Specifically, the controller is further configured to: decreasing the operating frequency of the compressor 10 and the blower 11 when the temperature difference is greater than the high temperature threshold; after reducing the operating frequency of the compressor 10 and the fan 11, when the temperature fluctuation value of the evaporator temperature is not higher than a preset temperature fluctuation threshold value within a preset duration, if the temperature difference is still greater than the high temperature threshold value, controlling the frequency of the compressor 10 to be maintained at the current operating frequency unchanged, and increasing the operating frequency of the fan 11; after the operating frequency of the fan is increased, when the temperature fluctuation value of the evaporator temperature is not higher than a preset temperature fluctuation threshold value within a preset duration, if the temperature difference is still greater than the high temperature threshold value, the operating frequency of the compressor 10 and the fan 11 is reduced.
Referring to fig. 8, fig. 8 is a third workflow diagram of a controller according to an embodiment of the present invention, where after step S14 is performed, the controller is further configured to perform steps S151 to S157:
s151, judging whether Tmax < DeltaT is met, if yes, proceeding to step S152, otherwise, executing the rest control logic, such as steps S15-S16 or S161-S167.
S152, when Tmax < Δt is satisfied, the operation frequencies of the compressor 10 and the blower 11 are reduced, and then the process proceeds to step S153.
By way of example, when Tmax < Δt is satisfied, it indicates that the evaporator temperature is very low and less than the optimal evaporator temperature, and the evaporator temperature is too low, so that the overall energy efficiency is low, and even long-term operation can cause frosting of the evaporator, and at this time, the evaporation temperature can be effectively increased by reducing the refrigerant circulation volume of the refrigeration system, so that measures for reducing the frequency of the compressor can be adopted, a larger dehumidification amount can be realized, and meanwhile, the overall power is reduced, so that the overall energy efficiency is increased. In addition, when the evaporator temperature is too low, the temperature of the evaporator is adjusted by reducing the frequency of the compressor (having a larger influence on the temperature of the evaporator) and increasing the rotation speed of the fan (having a smaller influence on the temperature of the evaporator), in the embodiment of the invention, the temperature of the evaporator is firstly increased by reducing the operation frequency of the compressor 10, but in order to avoid that the temperature of the evaporator is increased too quickly in the process and is less than or equal to Tmin, when the frequency of the compressor 10 is reduced, the rotation speed of the fan 11 is required to be reduced together, so that the temperature of the evaporator is gradually increased.
S153, judging whether the temperature fluctuation of the evaporator temperature meets the requirement of' not higher than a temperature fluctuation threshold value within a preset duration? If yes, the process proceeds to step S154, and if not, the process proceeds to step S153 repeatedly.
For example, the temperature fluctuation of the evaporator temperature is not higher than the temperature fluctuation threshold value within a certain period of time, which means that the evaporator temperature tends to be stable at this time, and the subsequent judgment can be performed.
And S154, when the temperature fluctuation of the evaporator temperature meets the requirement that the temperature fluctuation is not higher than a temperature fluctuation threshold value within the preset duration, judging whether Tmax < delta T is met again, if yes, entering a step S155, otherwise, indicating that the evaporator temperature is gradually increased after the operation of the step S152, and when Tmin < delta T is less than or equal to Tmax, entering a step S16.
If Tmax < Δt is satisfied, it indicates that the evaporator temperature is still too low after the operation in step S152, and at this time, the operation frequency of the compressor 10 is controlled to be unchanged, and the operation frequency of the fan 11 is increased, and the fan operation frequency is increased, so that the air volume flowing through the evaporator is increased, and the same refrigerant circulation volume can obtain more heat, i.e. the evaporator temperature is increased, and then step S156 is performed.
S156, determining again whether the temperature fluctuation of the evaporator temperature satisfies "not higher than the temperature fluctuation threshold value within the preset duration"? If yes, the process proceeds to step S157, and if not, the process repeats step S156.
And S157, when the temperature fluctuation of the evaporator temperature meets the requirement that the temperature fluctuation is not higher than a temperature fluctuation threshold value within the preset duration, judging whether Tmax < DeltaT is met again, if so, entering a step S152, wherein the condition that the evaporator temperature is still too low after the operation of the step S155 is shown, and entering a cycle to reduce the operation frequency of the fan 11 and the compressor 10 again. If Tmax < Δt is not satisfied, it means that the evaporator temperature has been gradually increased after the operation of step S155, and when Tmin < Δt+.tmax is reached, the process proceeds to step S16.
For example, assuming that the ambient dry bulb temperature range is (18 ℃,20 ℃) and the ambient relative humidity range is (50%, 60%), the preset ambient dew point temperature range is defined (13 ℃,15 ℃) according to the physical property parameters of the air, and the preset optimal evaporator temperature range corresponding to the ambient dew point temperature range (13 ℃,15 ℃) is defined (5 ℃,8 ℃) according to the analysis of experimental results]Tmin=5 ℃, tmax=8 ℃, Δt e (5，8]If the evaporator temperature T at the moment is detected Z Ambient dew point temperature T =5℃ 0L =14 ℃, Δt=t 0L -T Z =8deg.C, meet Tmax<Δt, the operating frequency of the compressor 10 and the blower 11 is lowered and the subsequent judgment logic is entered.
In the embodiment of the invention, when the temperature of the evaporator is too low, the temperature of the evaporator can be more accurately regulated through the regulation of the wind speed when the running frequency of the compressor is unchanged, so that the temperature of the evaporator is increased. In addition, through experimental result analysis, a fan operating frequency range corresponding to the operating frequency of the compressor can be preset, more accurate adjustment of the temperature of the evaporator can be realized through adjustment of the wind speed 11 when the operating frequency of the compressor 10 is unchanged, so that efficient dehumidification is facilitated, in addition, in order to ensure the response speed and facilitate adjustment, the initial operating frequency of the compressor 10 corresponds to the middle value of the fan 11 operating frequency range, and then the falling or rising adjustment of the fan 11 operating frequency is performed according to a judging instruction. In addition, the scheme is not limited to directly increasing the wind speed when the temperature of the evaporator is very low, but firstly decreases and then increases, and fine adjustment is realized through judging the increase of preset time; and the temperature difference between the temperature of the evaporator and the dew point temperature is obtained only when the temperature of the evaporator is inconsistent with the preset threshold value, the machine is controlled, and the difference interval (Tmin, tmax) between the ambient dew point temperature and the temperature of the evaporator is preset in advance based on the optimal dehumidification amount without being preset based on frosting.
Specifically, the controller is further configured to: increasing the operating frequency of the compressor 10 and the blower 11 when the temperature difference is less than or equal to the low temperature threshold; after the operating frequencies of the compressor 10 and the fan 11 are increased, when the temperature fluctuation value of the evaporator temperature is not higher than a preset temperature fluctuation threshold value within a preset duration, if the temperature difference is still smaller than or equal to the low temperature threshold value, controlling the frequency of the compressor 10 to be kept unchanged at the current operating frequency, and reducing the operating frequency of the fan 11; after the operating frequency of the fan 11 is reduced, when the temperature fluctuation value of the evaporator temperature satisfies a preset temperature fluctuation threshold value within a preset duration, if the temperature difference is still greater than the high temperature threshold value, the operating frequency of the compressor 10 and the fan 11 is increased.
Referring to fig. 9, fig. 9 is a fourth operation flowchart of the controller according to the embodiment of the present invention, where after step S14 is performed, the controller is further configured to perform steps S161 to S167:
s161, judging whether the delta T is less than or equal to Tmin, if yes, proceeding to step S162, otherwise, executing other control logic, such as steps S15-S16 or S151-S157.
And S162, when the delta T is less than or equal to Tmin, the operation frequency of the compressor 10 and the fan 11 is increased, and then the step S163 is performed.
For example, when Δt is equal to or less than Tmin, it indicates that the evaporator temperature is higher and higher than the optimal evaporator temperature, and that the evaporator temperature is too high indicates that the refrigerant circulation amount of the refrigeration system is too low, resulting in a decrease in the efficiency of heat exchange of the evaporator and a decrease in the dehumidification effect, and at the same time, the high-low pressure difference of the compressor 10 is too small, which is smaller than the minimum pressure difference for stable operation of the compressor 10, resulting in a failure of the compressor 10 to start, so that it is necessary to increase the compressor frequency to lower the evaporator temperature. In order to avoid Tmax < Δt, which is caused by too rapid a decrease in the evaporator temperature change during the increase of the compressor frequency, it is necessary to increase the rotation speed of the blower 11 at the same time when the compressor frequency is increased.
S163, judging whether the temperature fluctuation of the evaporator temperature meets the requirement of' not higher than a temperature fluctuation threshold value within a preset duration? If yes, the process proceeds to step S164, and if not, the process repeats step S163.
For example, the temperature fluctuation of the evaporator temperature is not higher than the temperature fluctuation threshold value within a certain period of time, which means that the evaporator temperature tends to be stable at this time, and the subsequent judgment can be performed.
And S164, when the temperature fluctuation of the evaporator temperature meets the requirement that the temperature fluctuation is not higher than a temperature fluctuation threshold value within the preset duration, judging whether the temperature fluctuation is not higher than the temperature fluctuation threshold value again, if so, entering a step S165, otherwise, indicating that the evaporator temperature is gradually reduced after the operation of the step S162, and when the temperature fluctuation reaches the Tmin < DeltaT not higher than Tmax, entering a step S16.
S165, if the delta T is less than or equal to Tmin, the evaporator temperature is still too high after the operation of the step S162, at the moment, the operation frequency of the compressor 10 is controlled to be unchanged, meanwhile, the operation frequency of the fan 11 is reduced, so that the evaporator temperature is also reduced, and then the step S166 is carried out.
S166, determining whether the temperature fluctuation of the evaporator temperature satisfies "not higher than the temperature fluctuation threshold value within the preset duration"? If yes, the process proceeds to step S167, and if not, step S166 is repeatedly executed.
And S167, when the temperature fluctuation of the evaporator temperature meets the requirement that the temperature fluctuation is not higher than a temperature fluctuation threshold value within the preset duration, judging whether deltaT is not more than Tmin again, if so, entering a step S162, wherein the step S165 shows that the evaporator temperature is still too high after the operation of the step S165, and entering a cycle again to improve the operation frequency of the fan and the compressor 11. If ΔT.ltoreq.Tmin is not satisfied, it indicates that the evaporator temperature has been gradually decreased after the operation of step S165, and when Tmin < ΔT.ltoreq.Tmax is reached, the process proceeds to step S16.
For example, assuming that the ambient dry bulb temperature range is (18 ℃,20 ℃) and the ambient relative humidity range is (50%, 60%), the preset ambient dew point temperature range is defined (13 ℃,15 ℃) according to the physical property parameters of the air, and the preset optimal evaporator temperature range corresponding to the ambient dew point temperature range (13 ℃,15 ℃) is defined (5 ℃,8 ℃) according to the analysis of experimental results]Tmin=5 ℃, tmax=8 ℃, Δt e (5, 8]If the evaporator temperature T at the moment is detected Z Ambient dew point temperature T =10℃ 0L =14 ℃, Δt=t 0L -T Z =4deg.C, satisfying ΔT+.Tmin, then the operating frequency of compressor 10 and fan 11 is increased and the subsequent decision logic is entered.
In the embodiment of the invention, when the temperature of the evaporator is too high, the temperature of the evaporator can be more accurately regulated through the regulation of the wind speed when the operation frequency of the compressor 10 is unchanged, so that the temperature of the evaporator is reduced. In addition, through experimental result analysis, a fan operating frequency range corresponding to the operating frequency of the compressor can be preset, and more accurate adjustment of the temperature of the evaporator can be realized through adjustment of the wind speed when the operating frequency of the compressor 10 is unchanged, so that efficient dehumidification is facilitated, in order to ensure the response speed and facilitate adjustment, the initial operating frequency of the compressor 10 corresponds to the intermediate value of the fan operating frequency range, and then the falling or rising adjustment of the fan operating frequency is performed according to a judging instruction.
Compared with the prior art, the dehumidifier 100 disclosed in the embodiment of the invention controls the operation frequencies of the compressor 10 and the fan 11 by presetting the difference value interval between the ambient dew point temperature and the evaporator temperature and according to the comparison relation between the temperature difference between the ambient dew point temperature and the evaporator temperature and the difference value interval, thereby realizing the dynamic adjustment of the operation frequencies of the compressor 10 and the fan 11. In addition, the scheme can realize that the operating frequency of the compressor corresponds to a group of fan operating frequencies, more accurate adjustment of the temperature of the evaporator can be realized through adjustment of the wind speed when the operating frequency of the compressor 10 is unchanged, and the control method is efficient and energy-saving, is suitable for machine types with different nominal dehumidification amounts, does not need to carry out a large number of experiments on new machine types, and realizes intelligent lifting of the machine.
Referring to fig. 10, fig. 10 is a flowchart of a dehumidifier control method according to an embodiment of the present invention, where the dehumidifier control method according to the embodiment of the present invention is implemented by a controller in a dehumidifier, and the dehumidifier control method includes:
s1, after a dehumidifier is started, controlling a compressor and a fan in the dehumidifier to operate according to preset frequency of a dehumidification system;
S2, after the dehumidification system meets preset stable operation conditions, calculating an environmental dew point temperature according to an environmental dry bulb temperature and an environmental relative humidity;
s3, calculating a temperature difference between the ambient dew point temperature and the evaporator temperature;
and S4, when the temperature difference is smaller than or equal to a high temperature threshold value and is larger than a low temperature threshold value, controlling the frequencies of the compressor and the fan to be maintained at the preset frequency.
Specifically, the steady operation conditions are: the operation time of the dehumidification system after the dehumidifier is started reaches a first preset time; the first preset duration is a duration predicted by a laboratory when the evaporator temperature reaches the corresponding optimal evaporator temperature under the current environmental factors.
Specifically, the method further comprises:
when the control duration of controlling the frequency of the compressor and the frequency of the fan to be maintained at the preset frequency reaches a second preset duration, acquiring the environment relative humidity;
reducing the operating frequency of the compressor and the blower when the ambient relative humidity is equal to a set humidity of the dehumidification system;
when the ambient relative humidity is less than the set humidity of the dehumidification system, controlling the compressor to stop and reducing the running frequency of the fan;
When the ambient relative humidity is greater than the set humidity of the dehumidification system, the dew point temperature is recalculated.
Specifically, the method further comprises:
reducing the operating frequency of the compressor and the fan when the temperature difference is greater than the high temperature threshold;
after the operating frequencies of the compressor and the fan are reduced, when the temperature fluctuation value of the evaporator temperature is not higher than a preset temperature fluctuation threshold value within a preset duration, if the temperature difference is still higher than the high temperature threshold value, controlling the frequency of the compressor to be kept unchanged at the current operating frequency, and improving the operating frequency of the fan;
and after the operating frequency of the fan is increased, when the temperature fluctuation value of the evaporator temperature is not higher than a preset temperature fluctuation threshold value within a preset duration, if the temperature difference is still higher than the high temperature threshold value, the operating frequency of the compressor and the fan is reduced.
Specifically, the method further comprises:
when the temperature difference is less than or equal to the low temperature threshold, increasing the operating frequency of the compressor and the fan;
after the operating frequencies of the compressor and the fan are increased, when the temperature fluctuation value of the evaporator temperature is not higher than a preset temperature fluctuation threshold value within a preset duration, if the temperature difference is still smaller than or equal to the low temperature threshold value, controlling the frequency of the compressor to be unchanged at the current operating frequency, and reducing the operating frequency of the fan;
And after the operating frequency of the fan is reduced, when the temperature fluctuation value of the temperature of the evaporator is not higher than a preset temperature fluctuation threshold value within a preset duration, if the temperature difference is still higher than the high temperature threshold value, the operating frequency of the compressor and the fan is increased.
It should be noted that, the working process of the dehumidifier control method according to the embodiment of the present invention may refer to the working process of the controller in the dehumidifier described in the above embodiment, and will not be described herein.
Compared with the prior art, the dehumidifier control method disclosed by the embodiment of the invention controls the running frequency of the compressor and the fan by presetting the difference value interval of the ambient dew point temperature and the evaporator temperature and according to the comparison relation between the temperature difference of the ambient dew point temperature and the evaporator temperature and the difference value interval, thereby realizing the dynamic adjustment of the running frequency of the compressor and the running frequency of the fan. In addition, the scheme can realize that one press operating frequency corresponds to one group of fan operating frequencies, more accurate adjustment of the temperature of the evaporator can be realized through adjustment of the wind speed when the compressor operating frequency is unchanged, the control method is efficient and energy-saving, is suitable for machine types with different nominal dehumidification amounts, does not need to carry out a large number of experiments on new machine types, and realizes intelligent lifting of the machine.
While the foregoing is directed to the preferred embodiments of the present invention, it will be appreciated by those skilled in the art that changes and modifications may be made without departing from the principles of the invention, such changes and modifications are also intended to be within the scope of the invention.

Claims (6)

1. A dehumidifier, comprising:
the dehumidification system is used for adjusting the humidity of indoor air and comprises a compressor, a condenser, an evaporator and a fan which are arranged in the shell of the dehumidifier;
the detection device comprises an environment temperature sensor for detecting the temperature of an environment dry bulb, an evaporator temperature sensor for detecting the temperature of an evaporator and an environment humidity sensor for detecting the relative humidity of the environment;
the controller is used for controlling the compressor and the fan to operate according to the preset frequency of the dehumidification system after the dehumidifier is started, calculating the ambient dew point temperature according to the ambient dry bulb temperature and the ambient relative humidity after the dehumidification system meets the preset stable operation condition, calculating the temperature difference between the ambient dew point temperature and the evaporator temperature, and controlling the frequency of the compressor and the fan to be maintained at the preset frequency when the temperature difference is smaller than or equal to a high-temperature threshold and larger than a low-temperature threshold;
Reducing the operating frequency of the compressor and the fan when the temperature difference is greater than the high temperature threshold;
after the operating frequencies of the compressor and the fan are reduced, when the temperature fluctuation value of the evaporator temperature is not higher than a preset temperature fluctuation threshold value within a preset duration, if the temperature difference is still higher than the high temperature threshold value, controlling the frequency of the compressor to be kept unchanged at the current operating frequency, and improving the operating frequency of the fan;
after the operating frequency of the fan is increased, when the temperature fluctuation value of the temperature of the evaporator is not higher than a preset temperature fluctuation threshold value within a preset duration, if the temperature difference is still higher than the high temperature threshold value, the operating frequency of the compressor and the fan is reduced;
wherein the steady operation condition is: the operation time of the dehumidification system after the dehumidifier is started reaches a first preset time; the first preset duration is a duration predicted by a laboratory when the evaporator temperature reaches the corresponding optimal evaporator temperature under the current environmental factors.
2. The dehumidifier of claim 1, wherein the controller is further configured to:
When the control duration of controlling the frequency of the compressor and the frequency of the fan to be maintained at the preset frequency reaches a second preset duration, acquiring the environment relative humidity;
reducing the operating frequency of the compressor and the blower when the ambient relative humidity is equal to a set humidity of the dehumidification system;
when the ambient relative humidity is less than the set humidity of the dehumidification system, controlling the compressor to stop and reducing the running frequency of the fan;
when the ambient relative humidity is greater than the set humidity of the dehumidification system, the dew point temperature is recalculated.
3. The dehumidifier of claim 1, wherein the controller is further configured to:
when the temperature difference is less than or equal to the low temperature threshold, increasing the operating frequency of the compressor and the fan;
after the operating frequencies of the compressor and the fan are increased, when the temperature fluctuation value of the evaporator temperature is not higher than a preset temperature fluctuation threshold value within a preset duration, if the temperature difference is still smaller than or equal to the low temperature threshold value, controlling the frequency of the compressor to be unchanged at the current operating frequency, and reducing the operating frequency of the fan;
And after the operating frequency of the fan is reduced, when the temperature fluctuation value of the temperature of the evaporator is not higher than a preset temperature fluctuation threshold value within a preset duration, if the temperature difference is still higher than the high temperature threshold value, the operating frequency of the compressor and the fan is increased.
4. A dehumidifier control method, comprising:
after the dehumidifier is started, controlling a compressor and a fan in the dehumidifier to operate according to the preset frequency of a dehumidification system;
after the dehumidification system meets preset stable operation conditions, calculating an environmental dew point temperature according to an environmental dry bulb temperature and an environmental relative humidity;
calculating a temperature difference between the ambient dew point temperature and the evaporator temperature;
when the temperature difference is smaller than or equal to a high temperature threshold value and is larger than a low temperature threshold value, controlling the frequencies of the compressor and the fan to be maintained at the preset frequency;
reducing the operating frequency of the compressor and the fan when the temperature difference is greater than the high temperature threshold;
after the operating frequencies of the compressor and the fan are reduced, when the temperature fluctuation value of the evaporator temperature is not higher than a preset temperature fluctuation threshold value within a preset duration, if the temperature difference is still higher than the high temperature threshold value, controlling the frequency of the compressor to be kept unchanged at the current operating frequency, and improving the operating frequency of the fan;
After the operating frequency of the fan is increased, when the temperature fluctuation value of the temperature of the evaporator is not higher than a preset temperature fluctuation threshold value within a preset duration, if the temperature difference is still higher than the high temperature threshold value, the operating frequency of the compressor and the fan is reduced;
wherein the steady operation condition is: the operation time of the dehumidification system after the dehumidifier is started reaches a first preset time; the first preset duration is a duration predicted by a laboratory when the evaporator temperature reaches the corresponding optimal evaporator temperature under the current environmental factors.
5. The dehumidifier control method of claim 4, further comprising:
when the control duration of controlling the frequency of the compressor and the frequency of the fan to be maintained at the preset frequency reaches a second preset duration, acquiring the environment relative humidity;
reducing the operating frequency of the compressor and the blower when the ambient relative humidity is equal to a set humidity of the dehumidification system;
when the ambient relative humidity is less than the set humidity of the dehumidification system, controlling the compressor to stop and reducing the running frequency of the fan;
When the ambient relative humidity is greater than the set humidity of the dehumidification system, the dew point temperature is recalculated.
6. The dehumidifier control method of claim 4, further comprising:
when the temperature difference is less than or equal to the low temperature threshold, increasing the operating frequency of the compressor and the fan;
after the operating frequencies of the compressor and the fan are increased, when the temperature fluctuation value of the evaporator temperature is not higher than a preset temperature fluctuation threshold value within a preset duration, if the temperature difference is still smaller than or equal to the low temperature threshold value, controlling the frequency of the compressor to be unchanged at the current operating frequency, and reducing the operating frequency of the fan;
and after the operating frequency of the fan is reduced, when the temperature fluctuation value of the temperature of the evaporator is not higher than a preset temperature fluctuation threshold value within a preset duration, if the temperature difference is still higher than the high temperature threshold value, the operating frequency of the compressor and the fan is increased.
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