CN107062470B - Air conditioner and constant-temperature dehumidification control method thereof - Google Patents
Air conditioner and constant-temperature dehumidification control method thereof Download PDFInfo
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- CN107062470B CN107062470B CN201710112656.6A CN201710112656A CN107062470B CN 107062470 B CN107062470 B CN 107062470B CN 201710112656 A CN201710112656 A CN 201710112656A CN 107062470 B CN107062470 B CN 107062470B
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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
- F24F5/00—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater
- F24F5/0007—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater cooling apparatus specially adapted for use in air-conditioning
- F24F5/001—Compression cycle type
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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
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
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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
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
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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
- F24F11/70—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
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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
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
- F24F11/83—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers
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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
- F24F2110/00—Control inputs relating to air properties
- F24F2110/10—Temperature
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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
- F24F2110/00—Control inputs relating to air properties
- F24F2110/20—Humidity
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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
- 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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/64—Electronic processing using pre-stored data
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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
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
- F24F11/83—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers
- F24F11/84—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers using valves
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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
- F24F2110/00—Control inputs relating to air properties
- F24F2110/10—Temperature
- F24F2110/12—Temperature of the outside 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
- F24F2221/00—Details or features not otherwise provided for
- F24F2221/34—Heater, e.g. gas burner, electric air heater
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- 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
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Abstract
The invention discloses an air conditioner and a constant temperature dehumidification control method thereof, and relates to the technical field of dehumidification of air conditioners. The invention aims to solve the problems of complex structure and high manufacturing cost of the air conditioner capable of realizing constant-temperature dehumidification in the prior art. The air conditioner comprises a refrigerating and heating system consisting of a compressor, an outdoor heat exchanger, an indoor heat exchanger, a four-way valve, an indoor fan and an outdoor fan, and further comprises an indoor temperature sensor, an indoor humidity sensor and a control unit, wherein the control unit is electrically connected with the indoor temperature sensor, the indoor humidity sensor, the four-way valve and the compressor, and the control unit can control the reversing state of the four-way valve and the running frequency of the compressor. The air conditioner can be used for realizing indoor constant-temperature dehumidification.
Description
Technical Field
The invention relates to the technical field of air conditioner dehumidification, in particular to an air conditioner and a constant temperature dehumidification control method thereof.
Background
Generally, the air conditioner must perform cooling while performing a dehumidifying operation. Therefore, when the indoor temperature is high, the dehumidifying operation of the air conditioner can simultaneously realize cooling and dehumidifying, and when the indoor temperature is low, if the dehumidifying operation of the air conditioner is performed again, the indoor temperature is further reduced, so that the user feels cold. In order to avoid the above problems, there is a need for an air conditioner system and a control method thereof capable of achieving constant temperature dehumidification.
At present, an air conditioner system capable of realizing constant temperature dehumidification in the prior art is that a dehumidification valve is connected in series in an indoor heat exchange coil of a common air conditioner, in the constant temperature dehumidification process, the dehumidification valve is closed and plays a role in throttling, one part of an indoor heat exchanger is used as an evaporator in dehumidification, the other part of the indoor heat exchanger is directly communicated with an outdoor heat exchanger to flow a high-temperature and high-pressure refrigerant, therefore, one part of air flow flowing through the indoor heat exchanger is heated in an indoor air duct, the other part of the air flow is cooled, the air flow is blown out from an indoor air outlet after being mixed, and constant temperature dehumidification is realized.
However, the air conditioner system capable of achieving constant temperature dehumidification needs to add a dehumidification valve on the indoor heat exchanger, the flow path in the indoor heat exchanger is complex in design and high in manufacturing cost, and the dehumidification valve is connected in series in the indoor heat exchange coil pipe, so that harmful pressure loss is generated, the performance of the whole air conditioner is reduced, and therefore the air conditioner system is difficult to popularize and apply widely.
Disclosure of Invention
The invention provides an air conditioner and a constant temperature dehumidification control method thereof, which can reduce the design complexity and cost of the air conditioner and ensure the overall performance of the air conditioner.
In order to achieve the purpose, the invention provides an air conditioner, which comprises a refrigerating and heating system consisting of a compressor, an outdoor heat exchanger, an indoor heat exchanger, a four-way valve, an indoor fan and an outdoor fan, and also comprises an indoor temperature sensor, an indoor humidity sensor and a control unit, wherein the control unit is electrically connected with the indoor temperature sensor, the indoor humidity sensor, the four-way valve and the compressor, and can control the reversing state of the four-way valve and the running frequency of the compressor.
The invention also provides a constant temperature dehumidification control method of the air conditioner, which comprises the following steps:
s1, starting a constant temperature dehumidification function of the air conditioner;
s2, detecting indoor temperature T by indoor temperature sensorinThe control unit is based on TinAnd a user-set temperature Ts, a calculated temperature difference △ T ═ Tin－Ts；
S3, controlling the air conditioner to perform cooling or heating operation by the control unit according to the temperature difference △ T so as to adjust the temperature difference △ T to be within a preset temperature difference range;
s4, detecting indoor relative humidity R by indoor humidity sensorh；
S5, when RhWhen the humidity is greater than or equal to the first preset humidity, the control unit controls the air conditioner to perform dehumidification operation, and after the dehumidification operation lasts for the first preset time, the operation proceeds to step S2.
After the constant temperature dehumidification function of the air conditioner is started, the control unit firstly starts the constant temperature dehumidification function according to the detection value T of the indoor temperature sensorinAnd setting temperature Ts by a user, calculating temperature difference △ T, controlling the air conditioner to perform cooling or heating operation by the control unit according to the temperature difference △ T to adjust the temperature difference △ T to be within a preset temperature difference range, and detecting indoor relative humidity R by an indoor humidity sensorhWhen R ishCompared with the prior art, the air conditioner provided by the embodiment of the invention can realize constant temperature dehumidification of the air conditioner only by arranging the temperature sensor and the humidity sensor indoors, does not need to connect a dehumidification valve in series in a coil pipe of an indoor heat exchanger, does not need to change a flow path of a refrigerant, so that the design complexity and the cost of the air conditioner are lower, and the whole performance of the air conditioner is ensured.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic structural diagram of an air conditioner according to an embodiment of the present invention;
FIG. 2 is a first flowchart of a constant temperature dehumidification control method of an air conditioner according to an embodiment of the present invention;
FIG. 3 is a second flowchart of a constant temperature dehumidification control method of an air conditioner according to an embodiment of the present invention;
FIG. 4 shows a method for controlling constant temperature dehumidification F of an air conditioner according to an embodiment of the present invention1、F2、F3、F4、F5、F6And ToutGraph of the relationship between.
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", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
The dehumidification principle of the air conditioner is as follows: when the air conditioner operates in a refrigerating mode, the surface temperature of the coil pipe of the indoor heat exchanger is low, and water vapor in indoor air flowing through the indoor heat exchanger is liquefied when meeting cold, so that condensed water is formed and discharged to the outdoor environment.
Referring to fig. 1, fig. 1 is a specific embodiment of an air conditioner according to an embodiment of the present invention, the air conditioner according to the embodiment includes a refrigeration and heating system including a compressor 1, an outdoor heat exchanger 2, an indoor heat exchanger 3, a four-way valve 4, an indoor fan (not shown in the figure) and an outdoor fan (not shown in the figure), and further includes an indoor temperature sensor 5, an indoor humidity sensor 6 and a control unit 7, the control unit 7 is electrically connected to the indoor temperature sensor 5, the indoor humidity sensor 6, the four-way valve 4 and the compressor 1, and the control unit 7 can control a reversing state of the four-way valve 4 and an operation frequency of the compressor 1.
In the air conditioner provided by the invention, after the constant temperature dehumidification function of the air conditioner is started, the control unit 7 firstly detects the T value of the indoor temperature sensor 5inAnd a user-set temperature Ts, calculating a temperature difference △ T, controlling cooling or heating operation of the air conditioner by the control unit 7 according to the temperature difference △ T to adjust the temperature difference △ T to be within a preset temperature difference range, and detecting the indoor relative humidity R by the indoor humidity sensor 6hWhen R ishCompared with the prior art, the air conditioner provided by the embodiment of the invention can realize constant temperature dehumidification of the air conditioner only by arranging the temperature sensor and the humidity sensor indoors, does not need to connect a dehumidification valve in series in a coil of the indoor heat exchanger 3, does not need to change a flow path of a refrigerant, and therefore, the design complexity and the cost of the air conditioner are lower, and the whole performance of the air conditioner is ensured.
It should be noted that, in the above embodiment, the control unit 7 may control the reversing state of the four-way valve 4 and the operating frequency of the compressor 1, that is, the control unit 7 may control the heating operation and the cooling operation of the air conditioner and the frequency of the compressor 1 during the heating operation or the cooling operation.
In order to reasonably control the operating frequency of the compressor 1 to reduce the fluctuation range of the indoor temperature and also take the influence of the external environment temperature into consideration, specifically, the air conditioner further comprises an outdoor temperature sensor (not shown in the figure), the outdoor temperature sensor is electrically connected with the control unit 7, and the control unit 7 can adjust the operating frequency of the compressor 1 according to the detection value of the outdoor temperature sensor to avoid the condition that the fluctuation of the indoor temperature is large due to the overlarge or undersize operating frequency of the compressor 1.
In order to reduce the temperature of the coil of the indoor heat exchanger 3 and increase the dehumidification capacity of the air conditioner in unit time, the rotating speed of the indoor fan can be reduced, so that the cold air at the coil of the indoor heat exchanger 3 circulates slowly, the temperature at the coil of the indoor heat exchanger 3 is low, the amount of water vapor in the air flowing through the indoor heat exchanger 3 condensed into condensed water is large, and the dehumidification capacity in unit time is large. Therefore, the control unit 7 is also electrically connected with the indoor fan, and the control unit 7 can adjust the rotating speed of the indoor fan so as to reduce the rotating speed of the indoor fan to the preset lowest gear during the dehumidification operation of the air conditioner, so as to reduce the temperature of the coil of the indoor heat exchanger 3 and increase the dehumidification amount of the air conditioner in unit time.
In order to balance the partial cooling capacity of the air conditioner during the dehumidification process, so as to avoid that the indoor temperature is lower and lower during the dehumidification process, it is preferable that an auxiliary electric heater (not shown in the figure) is further included, the control unit 7 is electrically connected with the auxiliary electric heater, and the control unit 7 can control the auxiliary electric heater to be turned on or off, so that during the dehumidification process of the air conditioner, the control unit 7 can control the auxiliary electric heater to be turned on, so as to balance the partial cooling capacity of the air conditioner during the dehumidification process.
The auxiliary electric heater may be disposed in an air duct of the indoor unit of the air conditioner, may also be disposed at an air inlet of the indoor unit of the air conditioner, and may also be disposed at an air outlet of the indoor unit of the air conditioner, which is not limited herein.
Referring to fig. 2, an embodiment of the present invention further provides a constant temperature dehumidification control method of an air conditioner, including the following steps:
s1, starting a constant temperature dehumidification function of the air conditioner;
s2, detecting indoor temperature T by indoor temperature sensorinThe control unit is based on TinAnd a user set temperature Ts, a calculated temperature difference △T＝Tin－Ts；
S3, controlling the air conditioner to perform cooling or heating operation by the control unit according to the temperature difference △ T so as to adjust the temperature difference △ T to be within a preset temperature difference range;
s4, detecting indoor relative humidity R by indoor humidity sensorh；
S5, when RhWhen the humidity is greater than or equal to the first preset humidity, the control unit controls the air conditioner to perform dehumidification operation, and after the dehumidification operation lasts for the first preset time, the operation proceeds to step S2.
The invention provides a constant temperature dehumidification control method of an air conditionerinAnd setting temperature Ts by a user, calculating temperature difference △ T, controlling the air conditioner to perform cooling or heating operation by the control unit according to the temperature difference △ T to adjust the temperature difference △ T to be within a preset temperature difference range, and detecting indoor relative humidity R by an indoor humidity sensorhWhen R ishCompared with the prior art, the constant temperature dehumidification control method of the air conditioner can realize the constant temperature dehumidification of the air conditioner only by arranging the temperature sensor and the humidity sensor indoors, does not need to connect a dehumidification valve in series in a coil pipe of an indoor heat exchanger, does not need to change a flow path of a refrigerant, and therefore, the design complexity and the cost of the air conditioner are low, and the whole performance of the air conditioner is ensured.
In the above embodiment, the predetermined temperature difference range can be (-1, 1), (-2, 0), [0, 2]Etc., and are not particularly limited herein. Preferably, the preset temperature difference range is [0, 2 ], and when the temperature difference is within the preset temperature difference range, the indoor temperature T isinClose to the set temperature Ts of the user, and can not be used in a short time if refrigeration and dehumidification are carried outStarting indoor temperature TinThe deviation from the user set temperature Ts increases.
The first preset humidity may be 60%, 65%, 62%, etc., and is not particularly limited herein. However, in order to satisfy the comfort requirement of the human body, it is preferable that the first preset humidity is 65%, and when the indoor relative humidity is greater than or equal to 65%, the humidity is high, and the comfort requirement of the human body cannot be satisfied.
In addition, the first preset time may be 3min, 5min, 7min, and the like, and is not particularly limited herein. However, in order to ensure the reliability and stability of the dehumidification operation of the air conditioner, it is preferable that the first preset time is greater than or equal to 5min, and when the first preset time is less than 5min, the switching speed of the cooling and heating of the air conditioner is too fast in the operation process, the frequency change speed of the compressor is too fast, and the reliability and stability of the dehumidification operation of the air conditioner are low.
In step S5, the frequency of the compressor during the dehumidification operation of the air conditioner is the first frequency F to enable the air conditioner to perform dehumidification1First frequency F1Is required to be greater than or equal to F0，F0The minimum operating frequency at which the air conditioner can achieve dehumidification and the magnitude of the value is related to the outdoor ambient temperature, the greater the outdoor ambient temperature, F0The greater the value of (A), the lower the outdoor ambient temperature, F0The smaller the value of (a), the corresponding relationship can be determined by experiments. At this time, the air conditioner can perform dehumidification, otherwise, the air conditioner cannot perform dehumidification.
If the temperature difference △ T is within the predetermined temperature difference range, and R is within the predetermined temperature difference rangehIf the temperature and the humidity of the room are lower than the first preset humidity, both the indoor temperature and the indoor humidity satisfy the conditions, and at this time, the air conditioner may perform operations such as shutdown, heating operation, and cooling operation, which are not specifically limited herein. When the minimum value in the preset temperature difference range is greater than or equal to 0, after step S4, if R is greater than or equal to 0hIt is preferable that the air conditioner performs an operation of cooling operation to lower the indoor temperature to be closer to the user set temperature Ts than the first preset humidity.
Specifically, the maximum temperature within the preset temperature difference rangeWhen the small value is greater than or equal to 0, referring to fig. 3, after step S4, the constant temperature dehumidification control method of the air conditioner further includes: s5' when RhAnd when the humidity is less than or equal to the second preset humidity, the control unit controls the air conditioner to perform cooling operation, and the step S2 is executed after the second preset time is continued. The indoor temperature can be lowered to make the indoor temperature closer to the set temperature Ts of the user.
The second preset humidity is less than the first preset humidity, and the second preset humidity may be 40%, 35%, 38%, and so on, and is not limited specifically herein. However, in order to satisfy the comfort requirement of the human body, it is preferable that the second preset humidity is 40%, and when the indoor relative humidity is less than or equal to 40%, the indoor relative humidity is small and the human body easily feels dry.
In addition, the second preset time may be 3min, 5min, 7min, and the like, and is not particularly limited herein. However, in order to ensure reliability and stability of the dehumidifying operation of the air conditioner, it is preferable that the second preset time is greater than or equal to 5 min.
Furthermore, in order to prevent excessive dehumidification, it is preferable that the frequency of the compressor during the cooling operation of the air conditioner is the third frequency F in step S53Third frequency F3＜F0. At this time, the air conditioner will not be able to perform dehumidification to prevent further reduction of the indoor relative humidity, thereby preventing excessive dehumidification.
Further, when the minimum value within the preset temperature difference range is greater than or equal to 0, referring to fig. 3, after step S4, the constant temperature dehumidification control method of the air conditioner further includes: s5', when RhWhen the humidity is lower than the first preset humidity and higher than the second preset humidity, the control unit controls the air conditioner to perform cooling operation, and after the cooling operation lasts for a third preset time, the operation proceeds to step S2. The indoor temperature can be lowered to make the indoor temperature closer to the set temperature Ts of the user.
The third preset time may be 3min, 5min, 7min, and the like, and is not limited herein. However, in order to ensure reliability and stability of the dehumidifying operation of the air conditioner, it is preferable that the third preset time is greater than or equal to 5 min.
In addition, the first and second substrates are,in step S5 ″, the frequency of the compressor is the second frequency F during the cooling operation of the air conditioner2，F1＞F2＞F3Therefore, excessive dehumidification caused by too high frequency of the compressor can be prevented, and too low temperature reduction speed caused by too low frequency of the compressor can be avoided.
In the above embodiment, in order to avoid the situation that the operating frequency of the compressor is too high or too low to cause the fluctuation of the indoor temperature to be large, the influence of the external environment temperature is also considered, specifically, F1、F2、F3All detected values T of outdoor temperature sensoroutThe correlation function of the compressor, therefore, the refrigeration operation frequency range of the compressor is limited through the outdoor temperature, so that the phenomenon that the operation frequency of the compressor is too high to cause the indoor temperature to be suddenly reduced and too low to cause the indoor temperature to be incapable of being reduced for a long time is avoided, and the stability of the indoor temperature reduction process is improved.
Specifically, F1、F2、F3And ToutThe relationship between the two can be seen in FIG. 4, F1、F2、F3Can be expressed as:
Fi＝Fi_min+(Fi_max－Fi_min)×(Tout－Tmin)/(Tmax－Tmin)，
wherein i is 1, 2 or 3, TminAnd TmaxRespectively, a minimum value and a maximum value within a certain temperature interval, for example, Tmin＝20℃，TmaxWhen the air conditioner refrigerates at 30 deg.C, Fi_minWhen the external environment temperature T isout＜TminAt the refrigerating operation frequency of the compressor, Fi_maxWhen the external environment temperature T isout＞TmaxAt the refrigerating operation frequency of the compressor, Fi_minAnd Fi_maxThe method is obtained by combining experience according to a certain algorithm on the premise of acquiring a large amount of experimental data.
In the embodiment shown in fig. 2, specifically, the step S3 includes S31, when △ T is greater than the maximum value within the preset temperature difference range, the control unit controls the air conditioner cooling operation, S32, when △ T is within the preset temperature difference range, the process proceeds to step S4, and S33, when △ T is less than the minimum value within the preset temperature difference range, the control unit controls the air conditioner heating operation, so that the temperature difference △ T can be adjusted to be within the preset temperature difference range.
In step S31, in order to determine whether the temperature difference △ T is within the preset temperature difference after the air conditioner performs the cooling operation, the temperature difference △ T may be detected in real time during the cooling operation of the air conditioner, or the temperature difference △ T may be detected after every fourth preset time of the cooling operation of the air conditioner, which is not specifically limited herein, however, in order to reduce the detection frequency of the temperature difference △ T, it is preferable to adopt the second scheme, that is, after every fourth preset time of the cooling operation of the air conditioner, the temperature difference △ T is detected until the temperature difference △ T is within the preset temperature difference range, and the process proceeds to step S4.
Similarly, in step S33, in order to determine whether the temperature difference △ T is within the preset temperature difference after the air conditioner performs the heating operation, the temperature difference △ T may be detected in real time during the heating operation of the air conditioner, or the temperature difference △ T may be detected after every fifth preset time of the heating operation of the air conditioner, which is not specifically limited herein, however, in order to reduce the detection frequency of the temperature difference △ T, it is preferable to adopt the second scheme, that is, after every fifth preset time of the cooling operation of the air conditioner, the temperature difference △ T is detected again until the temperature difference △ T is within the preset temperature difference range, and then the process proceeds to step S4.
The fourth preset time and the fifth preset time may be 3min, 5min, 7min, and the like, and are not specifically limited herein. However, in order to ensure the reliability and stability of the dehumidifying operation of the air conditioner, it is preferable that the fourth preset time and the fifth preset time are greater than or equal to 5 min.
In addition, since the air conditioner performs cooling while dehumidifying, in step S33, in order to ensure that the air conditioner has a certain cooling capacity after the air conditioner heats, the air conditioner heating operation should make the temperature difference △ T greater than the minimum value within the preset temperature difference range by at least a preset unit value, so as to reserve a certain cooling capacity for the subsequent dehumidifying operation of the air conditioner.
The predetermined unit value may be 1 ℃, 0.5 ℃, 0.8 ℃ or the like, and is not particularly limited herein.
In step S31, the operation frequency of the compressor may be a preset fixed value during the cooling operation of the air conditioner, or may be determined according to the temperature difference △ T in the current state, which is not specifically limited herein, however, in order to reasonably control the operation frequency of the compressor to reduce the fluctuation range of the indoor temperature, it is preferable to determine the operation frequency of the compressor according to the temperature difference △ T in the current state, and specifically, in step S31, the frequency of the compressor during the cooling operation of the air conditioner is the target frequency FobjTarget frequency FobjThe temperature difference is △ T, so that the refrigerating operation frequency of the compressor is determined according to the temperature difference △ T, and the condition that the fluctuation range of the indoor temperature is large due to the fact that the operation frequency of the compressor is too large or too small is avoided.
Wherein, during the refrigeration operation process of the air conditioner, the air conditioner can or can not dehumidify, specifically according to the target frequency FobjAnd F0The size relationship between F and F is determinedobj≥F0Meanwhile, the air conditioner simultaneously refrigerates and dehumidifies; when F is presentobj＜F0In time, the air conditioner only refrigerates and does not dehumidify.
In step S33, when the air conditioner is operated for heating, the operation frequency of the compressor may be a preset fixed value, or may be a value detected by the indoor humidity sensor RhThe determination is not specifically limited herein. However, since the indoor relative humidity decreases as the indoor temperature increases, the air conditioner should increase the indoor temperature quickly to increase the rate of decrease of the indoor relative humidity when the indoor relative humidity is high, and increase the indoor temperature slowly to decrease the rate of decrease of the indoor relative humidity when the indoor relative humidity is low, during the heating process. Specifically, before step S33, the method further includes: the indoor humidity sensor detects the indoor relative humidity RhAccordingly, in step S33, if RhIf the frequency is greater than or equal to the first preset humidity, the frequency of the compressor in the heating operation process of the air conditioner is the fourth frequency F4If R ishLess than the first preset humidity and more than the second preset humidityWhen the frequency of the compressor is the fifth frequency F in the heating operation process of the air conditioner5If R ishWhen the humidity is less than or equal to the second preset humidity, the frequency of the compressor in the heating operation process of the air conditioner is the sixth frequency F6，F4＞F5＞F6. Therefore, the heating operation frequency of the compressor is determined according to the indoor relative humidity, so that the indoor relative humidity can be closer to the human comfort range when the air conditioner operates in heating.
In the above embodiment, in order to prevent the fluctuation range of the indoor temperature from being large due to the operation frequency of the compressor being too high or too low, the influence of the external environment temperature is also considered, specifically, F4、F5、F6All detected values T of outdoor temperature sensoroutThe correlation function limits the heating operation frequency range of the compressor through the outdoor temperature, so as to avoid the situation that the indoor temperature is suddenly increased due to overlarge heating operation frequency of the compressor and cannot be increased for a long time due to undersize heating operation frequency of the compressor, and improve the stability of the indoor temperature increasing process.
Specifically, F4、F5、F6And ToutThe relationship between the two can be seen in FIG. 4, F4、F5、F6Can be expressed as:
Fi＝Fi_max－(Fi_max－Fi_min)×(Tout－Tmin)/(Tmax－Tmin)，
where i is 4, 5 or 6, and when the air conditioner is heating, Fi_minWhen the external environment temperature T isout＞TmaxHeating operation frequency of the compressor, Fi_maxWhen the external environment temperature T isout＜TminHeating operation frequency of the compressor, Fi_minAnd Fi_maxThe method is also obtained by combining experience according to a certain algorithm on the premise of acquiring a large amount of experimental data.
In order to reduce the temperature of the indoor heat exchanger coil and increase the dehumidification capacity of the air conditioner in unit time, the rotating speed of the indoor fan can be reduced, so that cold air at the indoor heat exchanger coil circulates slowly, the temperature at the indoor heat exchanger coil is low, the amount of water vapor in the air flowing through the indoor heat exchanger is more, and the dehumidification capacity in unit time is more. Therefore, when the control unit controls the air conditioner to perform cooling and dehumidifying operation, the control unit also controls the rotating speed of the indoor fan to be reduced to the preset lowest gear so as to reduce the temperature of the coil of the indoor heat exchanger and increase the dehumidifying capacity of the air conditioner in unit time.
In order to balance the refrigerating capacity generated during dehumidification of the air conditioner during the refrigerating and dehumidifying operation of the air conditioner, it is preferable that the control unit controls the auxiliary electric heater to be turned on while the control unit controls the refrigerating and dehumidifying operation of the air conditioner. Therefore, the refrigerating capacity generated by the air conditioner during dehumidification is balanced by turning on the auxiliary electric heater.
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 person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (14)
1. An air conditioner comprises a refrigerating and heating system consisting of a compressor, an outdoor heat exchanger, an indoor heat exchanger, a four-way valve, an indoor fan and an outdoor fan, and is characterized by further comprising an indoor temperature sensor, an indoor humidity sensor and a control unit, wherein the control unit is electrically connected with the indoor temperature sensor, the indoor humidity sensor, the four-way valve and the compressor, and can control the reversing state of the four-way valve and the running frequency of the compressor;
when the instruction of the user is received, the user can select the user,
the control unit starts a constant temperature dehumidification control function of the air conditioner;
first, the control unit performs a temperature adjustment step:
in the roomTemperature sensor detects indoor temperature TinSaid control unit being dependent on said TinAnd a user-set temperature TsCalculating the temperature difference △ T = Tin－TsAccording to the temperature difference △ T, the control unit controls the air conditioner to perform cooling or heating operation so as to adjust the temperature difference △ T to be within a preset temperature difference range;
secondly, the control unit performs a humidity adjustment step:
the indoor humidity sensor detects indoor relative humidity RhThe control unit controls the RhComparing the first preset humidity with a second preset humidity;
when said R ishWhen the humidity is larger than or equal to the first preset humidity, the control unit controls the air conditioner to perform dehumidification operation, and the temperature regulation step is carried out after the dehumidification operation lasts for a first preset time;
when said R ishWhen the temperature is less than or equal to a second preset humidity, if the minimum value of the preset temperature difference is more than or equal to zero, the control unit controls the air conditioner to perform refrigeration operation, and the temperature is adjusted after the refrigeration operation lasts for a second preset time; at the moment, the power of the compressor during the refrigerating operation of the air conditioner is less than the lowest power during the dehumidifying operation;
wherein the second preset humidity is less than the first preset humidity.
2. The air conditioner according to claim 1, further comprising an outdoor temperature sensor electrically connected to the control unit, wherein the control unit adjusts an operating frequency of the compressor according to a detection value of the outdoor temperature sensor.
3. The air conditioner as claimed in claim 1, wherein the control unit is electrically connected to the indoor fan, and the control unit can adjust a rotation speed of the indoor fan.
4. The air conditioner according to claim 1, further comprising an auxiliary electric heater disposed in the room, wherein the control unit is electrically connected to the auxiliary electric heater, and the control unit controls the auxiliary electric heater to be turned on or off.
5. A constant temperature dehumidification control method of an air conditioner is characterized by comprising the following steps:
s1, starting a constant temperature dehumidification function of the air conditioner;
s2, detecting indoor temperature T by indoor temperature sensorinThe control unit is based on TinAnd a user-set temperature Ts, a calculated temperature difference △ T = Tin－Ts；
S3, controlling the air conditioner to perform cooling or heating operation by the control unit according to the temperature difference △ T so as to adjust the temperature difference △ T to be within a preset temperature difference range;
s4, detecting indoor relative humidity R by indoor humidity sensorh；
S5, when RhWhen the humidity is greater than or equal to the first preset humidity, the control unit controls the air conditioner to perform dehumidification operation, and the step S2 is executed after the dehumidification operation lasts for the first preset time;
s5', if the minimum value in the preset temperature difference range is greater than or equal to 0, when R is greater than or equal to 0hWhen the humidity is less than or equal to a second preset humidity, the control unit controls the air conditioner to perform refrigeration operation, and the step S2 is executed after the second preset time is continued;
wherein the second preset humidity is less than the first preset humidity; in the step S5', the frequency of the compressor is the third frequency F during the cooling operation of the air conditioner3Third frequency F3＜F0，F0A minimum operating frequency for the air conditioner to enable dehumidification.
6. The constant-temperature dehumidification control method according to claim 5, further comprising, after the step S4:
s5', when R is greater than or equal to 0, if the minimum value in the preset temperature difference rangehLess than the first predetermined humidity and greater than the second predetermined humidity,and the control unit controls the air conditioner to perform refrigerating operation, and after the refrigerating operation lasts for a third preset time, the operation is switched to the step S2.
7. The constant temperature dehumidification control method according to claim 6, wherein in the step S5, the frequency of the compressor during the dehumidification operation of the air conditioner is a first frequency F1In the step S5 ″, the frequency of the compressor during the cooling operation of the air conditioner is the second frequency F2，F1＞F2＞F3。
8. The constant-temperature dehumidification control method according to claim 7, wherein F1、F2、F3All detected values T of outdoor temperature sensoroutThe correlation function of (2).
9. The constant-temperature dehumidification control method according to claim 5, wherein the step S3 specifically comprises:
s31, when △ T is larger than the maximum value in the preset temperature difference range, the control unit controls the air conditioner to perform refrigeration operation;
s32, when △ T is located in the preset temperature difference range, directly switching to the step S4;
and S33, when △ T is smaller than the minimum value in the preset temperature difference range, controlling the air conditioner to perform heating operation by the control unit.
10. The constant-temperature dehumidification control method according to claim 9, wherein in the step S31, the frequency of the compressor during the cooling operation of the air conditioner is a target frequency FobjSaid target frequency FobjPositively correlated with the temperature difference △ T.
11. The constant-temperature dehumidification control method according to claim 9, further comprising, before the step S33:
the indoor humidity sensor detects the indoor relative humidity Rh；
Accordingly, in the step S33,
if R ishIf the frequency is greater than or equal to the first preset humidity, the frequency of the compressor in the heating operation process of the air conditioner is the fourth frequency F4，
If R ishWhen the frequency is smaller than the first preset humidity and larger than the second preset humidity, the frequency of the compressor in the heating operation process of the air conditioner is a fifth frequency F5，
If R ishWhen the humidity is less than or equal to the second preset humidity, the frequency of the compressor in the heating operation process of the air conditioner is the sixth frequency F6，
F4＞F5＞F6。
12. The constant-temperature dehumidification control method according to claim 11, wherein F4、F5、F6All detected values T of outdoor temperature sensoroutThe correlation function of (2).
13. The constant temperature dehumidification control method according to claim 5, wherein in step S5, the control unit controls a rotation speed of an indoor fan to be reduced to a preset minimum gear while the control unit controls the air conditioner to perform the dehumidification operation.
14. The constant temperature dehumidification control method according to claim 5, wherein in the step S5, the control unit controls an auxiliary electric heater to be turned on while the control unit controls the air conditioner to perform the dehumidification operation.
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| CN107883480B (en) * | 2017-10-19 | 2020-07-21 | 广东芬尼克兹节能设备有限公司 | Heat pump unit dehumidification control method |
| CN114383304B (en) * | 2020-10-19 | 2024-02-20 | 广东美的精密模具科技有限公司 | Air conditioner, dehumidification control method thereof and computer readable storage medium |
| CN114517971A (en) * | 2022-04-02 | 2022-05-20 | 珠海市金品创业共享平台科技有限公司 | Air conditioner constant temperature control method and system, related equipment and air conditioner |
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