CN106839324B - 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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- CN106839324B CN106839324B CN201710112653.2A CN201710112653A CN106839324B CN 106839324 B CN106839324 B CN 106839324B CN 201710112653 A CN201710112653 A CN 201710112653A CN 106839324 B CN106839324 B CN 106839324B
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- 238000007791 dehumidification Methods 0.000 title claims abstract description 80
- 238000000034 method Methods 0.000 title claims abstract description 41
- 238000010438 heat treatment Methods 0.000 claims abstract description 35
- 238000001816 cooling Methods 0.000 claims description 32
- 238000005057 refrigeration Methods 0.000 claims description 13
- 230000000875 corresponding effect Effects 0.000 claims description 10
- 230000001276 controlling effect Effects 0.000 claims description 8
- 238000001514 detection method Methods 0.000 claims description 6
- 230000002596 correlated effect Effects 0.000 claims description 3
- 238000005314 correlation function Methods 0.000 claims description 2
- 230000001419 dependent effect Effects 0.000 claims 1
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 7
- 239000003507 refrigerant Substances 0.000 description 4
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- 238000006467 substitution reaction Methods 0.000 description 2
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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
- 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
- F24F2110/00—Control inputs relating to air properties
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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
- 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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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 indoor heat exchanger, an outdoor heat exchanger, a four-way valve, an indoor fan and an outdoor fan, and further comprises an indoor temperature sensor, an indoor humidity sensor, an inner disc temperature sensor and a control unit, wherein the inner disc temperature sensor is used for detecting the temperature of a coil pipe of the indoor heat exchanger, the control unit is electrically connected with the indoor temperature sensor, the indoor humidity sensor, the inner disc temperature 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 constant temperature dehumidification of indoor air.
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 indoor heat exchanger, an outdoor heat exchanger, a four-way valve, an indoor fan and an outdoor fan, and further comprises an indoor temperature sensor, an indoor humidity sensor, an inner disc temperature sensor and a control unit, wherein the inner disc temperature sensor is used for detecting the temperature of a coil pipe of the indoor heat exchanger, the control unit is electrically connected with the indoor temperature sensor, the indoor humidity sensor, the inner disc temperature sensor, the four-way valve and the compressor, and the control unit can control the reversing state of the four-way valve and the operating 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 RhGreater than or equal to firstWhen the humidity is preset, the control unit controls the air conditioner to perform dehumidification operation and detects the coil temperature T of the indoor heat exchanger according to the inner disc temperature sensorPAdjusting the dehumidifying operation frequency of the compressor so that TP＜T1-a first predetermined unit value, after a first predetermined time of operation, proceeding to said 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 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 detects the coil temperature T of the indoor heat exchanger according to the inner disc temperature sensorPAdjusting the dehumidifying operation frequency of the compressor so that TP＜T1Compared 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 and arranging the inner disc temperature sensor on the coil pipe of the indoor heat exchanger, does not need to serially connect a dehumidification valve in the coil pipe of the 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 overall 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 is a graph showing the relationship between the first, second and third frequencies and the outdoor temperature in the constant temperature dehumidification control method of the air conditioner according to the embodiment of the present invention.
Reference numerals:
1-a compressor; 2-outdoor heat exchanger; 3-indoor heat exchanger; 4-a four-way valve; 5-indoor temperature sensor; 6-indoor humidity sensor; 7-inner disc temperature sensor; 8-a control unit.
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 refrigerates, 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. When the air conditioner refrigerates, only when the temperature of the coil pipe of the indoor heat exchanger is lower than the dew point temperature, the water vapor flowing through the indoor heat exchanger can be liquefied into condensed water, and at the moment, dehumidification can be carried out. And the dew point temperature of the indoor air is different corresponding to different relative humidity under the same indoor temperature condition. The higher the relative humidity, the higher the corresponding dew point temperature.
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, an inner disc temperature sensor 7 and a control unit 8, the inner disc temperature sensor 7 is used for detecting a coil temperature of the indoor heat exchanger 3, the control unit 8 is electrically connected to the indoor temperature sensor 5, the indoor humidity sensor 6, the inner disc temperature sensor 7, the four-way valve 4 and the compressor 1, and the control unit 8 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 8 firstly detects the T value of the indoor temperature sensor 5inAnd a user-set temperature Ts, calculating a temperature difference △ T, controlling the air conditioner to perform cooling or heating operation by the control unit 8 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 ishWhen the humidity is larger than or equal to the first preset humidity, the control unit 8 controls the dehumidification operation of the air conditioner and detects the coil temperature T of the indoor heat exchanger 3 according to the inner disc temperature sensor 7PRegulating the dehumidification of the compressor 1Operating frequency so as to make TP＜T1Compared 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 and arranging the inner disc temperature sensor on the coil pipe of the indoor heat exchanger, does not need to serially connect a dehumidification valve in the coil pipe of the 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 overall performance of the air conditioner is ensured.
It should be noted that, in the above embodiment, the control unit 8 may control the reversing state of the four-way valve 4 and the operating frequency of the compressor 1, that is, the control unit 8 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), and the outdoor temperature sensor is electrically connected with the control unit 8, so that the control unit 8 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 range 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 8 is also electrically connected to the indoor fan, and the control unit 8 can adjust the rotation speed of the indoor fan so that the rotation speed of the indoor fan can be reduced to a preset lowest gear, 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 part of the cooling capacity generated by the air conditioner during the dehumidification process, so as to avoid large fluctuation range of the indoor temperature, it is preferable that an auxiliary electric heater (not shown in the figure) is further included, the control unit 8 is electrically connected with the auxiliary electric heater, and the control unit 8 can control the auxiliary electric heater to be turned on or off, so that when the air conditioner performs the refrigeration and dehumidification, the auxiliary electric heater can be controlled to be turned on, so as to balance part of the 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 larger than or equal to the first preset humidity, the control unit controls the air conditioner to perform dehumidification operation and detects the coil temperature T of the indoor heat exchanger according to the inner disc temperature sensorPAdjusting the dehumidifying operation frequency of the compressor so that TP＜T1-a first predetermined unit value, after a first predetermined time of operation, proceeding to said step S2.
The invention provides a constant temperature dehumidification control of an air conditionerMethod, after starting constant temperature dehumidification function of air conditioner, the control unit firstly according to detection value T of 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 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 detects the coil temperature T of the indoor heat exchanger according to the inner disc temperature sensorPAdjusting the dehumidifying operation frequency of the compressor so that TP＜T1Compared with the prior art, the constant temperature dehumidification control method of 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 and arranging the inner disc temperature sensor on the coil pipe of the indoor heat exchanger, does not need to serially connect a dehumidification valve in the coil pipe of the indoor heat exchanger, does not need to change the flow path of a refrigerant, and therefore, the design complexity and the cost of the air conditioner are low, and the performance of the air conditioner is ensured.
In the above embodiments, the predetermined temperature difference range may 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 if the refrigeration and dehumidification are carried out, the indoor temperature T can not be caused in a short timeinThe 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 isThe degree is 65%, and when the indoor relative humidity is greater than or equal to 65%, the humidity is high, and the requirement of the comfort level of a human body cannot be met. Generally, dew point temperatures corresponding to different humidities are different at the same indoor temperature, and dew point temperatures corresponding to the same humidity are different at different indoor temperature conditions. Therefore, when the first predetermined humidity is 65%, the dew point temperature T corresponding to the first predetermined humidity1And indoor real-time temperature TinCan be represented by the following table 1:
TABLE 1
| Tin(℃) | 35 | 34 | 33 | 32 | 31 | 30 | 29 | 28 | 27 | 26 |
| T1(℃) | 27.34 | 26.43 | 25.46 | 24.51 | 23.52 | 22.58 | 21.63 | 20.65 | 19.73 | 18.75 |
| Tin(℃) | 25 | 24 | 23 | 22 | 21 | 20 | 19 | 18 | 17 | 16 |
| T1(℃) | 17.83 | 16.88 | 15.91 | 14.97 | 14.02 | 13.07 | 12.15 | 11.19 | 10.24 | 9.3 |
In the present invention, the following description will be given only with reference to table 1, and table 1 does not limit the present invention.
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.
Furthermore, the first predetermined unit value may be 1 ℃, 0.8 ℃, 0.5 ℃ or the like, and is not particularly limited herein.
Specifically, step S5 includes the following steps:
s51, the control unit controls the air conditioner to carry out refrigeration operation and enables the initial operation frequency of the compressor to be F01；
S52, after the indoor heat exchanger continuously runs for a second preset time, the inner disc temperature sensor detects the temperature T of the coil pipe of the indoor heat exchangerP；
S53, if TP≥T1-a first preset unit value, increasing the current operating frequency of the compressor by a first preset frequency; if TP＜T1-a first preset unit value, keeping the operating frequency of the compressor constant.
The second preset time is less than the first preset time, and the second preset time may be 3min, 5min, 7min, and the like, which 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 second preset time is greater than or equal to 5 min.
In addition, the first preset frequency is determined by experiments, and the value of the first preset frequency is not particularly limited herein.
Further, F01However, in order to reasonably control the operating frequency of the compressor to reduce the fluctuation range of the indoor temperature, it is preferable to determine the operating frequency of the compressor according to the temperature difference △ T under the current state, specifically, F01Positively correlated with the temperature difference △ T, thereby based on the temperature difference△ T defines the dehumidification operating frequency F of the compressor01So as to avoid the condition that the fluctuation range of the indoor temperature is large due to the overlarge or the undersize running frequency of the compressor.
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, when the minimum value in the preset temperature difference range is greater than or equal to 0, referring to fig. 3, after step S4, the method for controlling constant temperature dehumidification of an air conditioner further includes: s5' when RhAnd when 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 refrigeration operation, and the step S2 is executed after the refrigeration operation lasts for a third preset time. 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 third 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 third preset time is greater than or equal to 5 min. 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 less than or equal to the second preset humidity, the control unit controls the air conditioner to perform refrigeration operation and detects the humidity according to the temperature of the inner disc detected by the temperature sensorCoil temperature T of indoor heat exchangerPAdjusting the refrigerating operation frequency of the compressor so as to make TP＞T2And + the second predetermined unit value, and continuously operating for a fourth predetermined time, and then proceeding to step S2. Thus, on one hand, the indoor temperature can be reduced to make the indoor temperature closer to the set temperature Ts of the user; on the other hand, due to TP＞T2+ second predetermined unit value, so that the air conditioner will not be able to dehumidify at this time to prevent further reduction of indoor relative humidity, thereby avoiding excessive dehumidification.
Wherein, T2The dew point temperature T corresponding to the second preset humidity at the current indoor temperature is, for example, when the second preset humidity is 40%2And indoor real-time temperature TinCan be represented by the following table 2:
TABLE 2
| Tin(℃) | 35 | 34 | 33 | 32 | 31 | 30 | 29 | 28 | 27 | 26 |
| T2(℃) | 19.23 | 18.47 | 17.44 | 16.56 | 15.65 | 14.87 | 13.91 | 12.97 | 12.12 | 11.25 |
| Tin(℃) | 25 | 24 | 23 | 22 | 21 | 20 | 19 | 18 | 17 | 16 |
| T2(℃) | 10.32 | 9.47 | 8.6 | 7.69 | 6.83 | 5.95 | 5.05 | 4.22 | 3.33 | 2.47 |
In the present invention, the following description will be given only with reference to table 2, and table 2 does not limit the present invention.
In addition, the fourth 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 dehumidifying operation of the air conditioner, it is preferable that the fourth preset time is greater than or equal to 5 min.
Furthermore, the second predetermined unit value may be 1 ℃, 0.8 ℃, 0.5 ℃ or the like, and is not particularly limited herein.
Specifically, step S5 ″ includes:
s51', the control unit controls the air conditioner to perform the cooling operation and makes the initial operation frequency of the compressor F02；
S52', after the operation is continued for the fifth preset time, the inner disc temperature sensor detects the coil temperature T of the indoor heat exchangerP；
S53', if TP≤T2If the current operation frequency of the compressor is higher than the second preset unit value, the current operation frequency of the compressor is increased to a second preset frequency; if TP＞T2And + a second predetermined unit value, the operating frequency of the compressor is kept unchanged.
The second preset frequency is determined by experiments, and the value of the second preset frequency is not particularly limited.
In addition, the fifth preset time is less than the fourth preset time, and the fifth 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 fifth preset time is greater than or equal to 5 min.
Further, F02The temperature difference can be a preset fixed value or can be determined according to the temperature difference △ T in the current state, and is not particularly limited in the description, however, in order to reasonably control the operation frequency of the compressor to reduce the fluctuation amplitude of the indoor temperature, the operation frequency is preferably determined according to the temperature difference △ T in the current stateDetermining the operating frequency of the compressor, in particular, F, from the temperature difference △ T at the current state02Positively correlated with the temperature difference △ T, the dehumidification operating frequency F of the compressor is thus determined from the temperature difference △ T02So as to avoid the condition that the fluctuation range of the indoor temperature is large due to the overlarge or the undersize running frequency of the compressor.
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 sixth 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 sixth 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 seventh 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 seventh 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 sixth preset time and the seventh preset time may be 3min, 5min, 7min, and the like, and are not limited herein. However, in order to ensure the reliability and stability of the dehumidifying operation of the air conditioner, it is preferable that the sixth preset time and the seventh preset time are greater than or equal to 5 min.
In addition, since the air conditioner performs cooling while performing dehumidification, in order to reserve a certain cooling capacity for the subsequent dehumidification operation of the air conditioner, the air conditioner performs heating operation in step S33 such that the temperature difference △ T is greater than the minimum value within the preset temperature difference range by at least a preset unit value, thereby reserving a certain cooling capacity for the subsequent dehumidification 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 amplitude 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.
In step S31, during the cooling operation of the air conditioner, the air conditioner may or may not dehumidify the air conditioner, 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 with an increase in the indoor temperature, the air conditioner should be quickly heated when the indoor relative humidity is high during heatingThe indoor temperature is raised to increase the speed of reducing the indoor relative humidity, and if the indoor relative humidity is small, the indoor temperature is slowly raised to decrease the speed of reducing the indoor relative humidity. Specifically, before step S33, the method further includes: the indoor humidity sensor detects the indoor relative humidity RhAccordingly, in step S33, if RhIf the humidity 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 first frequency F1If R ishWhen the frequency is less than the first preset humidity and greater than the second preset humidity, the frequency of the compressor is the second frequency F in the heating operation process of the air conditioner2If 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 a third frequency F3，F1＞F2＞F3. 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, F1、F2、F3All 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, F1、F2、F3And ToutThe relationship between the two can be seen in FIG. 4, F1、F2、F3Can be expressed as:
Fi＝Fi_max－(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 heats at 30 deg.C, 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, step S53 further includes: the control unit controls the rotating speed of the indoor fan to be reduced to a preset lowest gear so as to reduce the temperature of the coil pipe of the indoor heat exchanger and increase the dehumidification amount of the air conditioner in unit time.
In step S53, when T is detectedP≥T1-at a first preset unit value, the control unit, while increasing the current operating frequency of the compressor by a first preset frequency, preferably when T is greater than T in order to balance the refrigeration capacity of the increased compressor frequency portionP≥T1-at a first preset unit value, the control unit also controls the auxiliary electric heater to be switched on, thereby balancing the cooling capacity of the frequency increasing portion of the compressor by switching 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 (13)
1. An air conditioner comprises a refrigerating and heating system consisting of a compressor, an indoor heat exchanger, an outdoor 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, an inner disc temperature sensor and a control unit, wherein the inner disc temperature sensor is used for detecting the temperature of a coil pipe of the indoor heat exchanger, the control unit is electrically connected with the indoor temperature sensor, the indoor humidity sensor, the inner disc temperature 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 outdoor temperature sensor is electrically connected with the control unit, and the control unit can adjust the running frequency of the compressor according to the detection value of the outdoor temperature sensor;
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:
the indoor temperature sensor detects the 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 greater than or equal to the first preset humidity, the control unit controls the air conditioner to perform dehumidification operation and detects the coil temperature T of the indoor heat exchanger according to the inner disc temperature sensorPAdjusting the dehumidifying operation frequency of the compressor so that TP＜T1-a first preset unit value,after the first preset time, switching to the temperature adjusting step;
when said R ishWhen the temperature of the coil pipe of the indoor heat exchanger 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 detects the temperature T of the coil pipe of the indoor heat exchanger according to the temperature sensor of the inner coil pipePAdjusting the refrigerating operation frequency of the compressor so as to make TP＞T2The temperature is adjusted after the operation lasts for a fourth preset time according to the second preset unit value; 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, T is1Is the dew point temperature corresponding to the first preset humidity at the current indoor temperature, T2The dew point temperature is the dew point temperature corresponding to the second preset humidity at the current indoor temperature, and the second preset humidity is smaller than the first preset humidity.
2. 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.
3. 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.
4. 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 larger than or equal to the first preset humidity, the control unit controls the air conditioner to perform dehumidification operation and detects the coil temperature T of the indoor heat exchanger according to the inner disc temperature sensorPAdjusting the dehumidifying operation frequency of the compressor so that TP＜T1-a first predetermined unit value, after a first predetermined time of operation, proceeding to step S2;
s5', the minimum value in the preset temperature difference range is greater than or equal to 0, when R ishWhen the humidity is less than or equal to a second preset humidity, the control unit controls the air conditioner to perform refrigeration operation and detects the coil temperature T of the indoor heat exchanger according to the inner disc temperature sensorPAdjusting the refrigerating operation frequency of the compressor so as to make TP＞T2After the operation continues for the fourth preset time, the operation goes to step S2;
wherein, T1Is the dew point temperature, T, corresponding to the first preset humidity at the current indoor temperature2The dew point temperature is the dew point temperature corresponding to the second preset humidity at the current indoor temperature.
5. The constant-temperature dehumidification control method according to claim 4, wherein the step S5 specifically comprises:
s51, the control unit controls the air conditioner to perform refrigeration operation and enables the initial operation frequency of the compressor to be F01；
S52, after the indoor heat exchanger continuously runs for a second preset time, the inner disc temperature sensor detects the temperature T of the coil pipe of the indoor heat exchangerP；
S53, if TP≥T1-a first preset unit value, increasing the current operating frequency of the compressor by a first preset frequency; if TP＜T1-a first preset unit value, keeping the operating frequency of the compressor constant;
and the second preset time is less than the first preset time.
6. The constant-temperature dehumidification control method according to claim 4, wherein a minimum value in the preset temperature difference range is greater than or equal to 0, and after the step S4, the method further comprises:
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 refrigeration operation, and after the air conditioner continues to operate for a third preset time, the operation proceeds to step S2,
wherein the second preset humidity is less than the first preset humidity.
7. The constant-temperature dehumidification control method according to claim 4, wherein the step S5 ″ specifically comprises:
s51', the control unit controls the air conditioner to perform cooling operation and makes the initial operation frequency of the compressor F02；
S52', after the operation is continued for the fifth preset time, the inner disc temperature sensor detects the coil temperature T of the indoor heat exchangerP；
S53', if TP≤T2If the current operation frequency of the compressor is higher than the preset second unit value, the current operation frequency of the compressor is increased to a preset second frequency; if TP＞T2If the operating frequency of the compressor is not changed, the operating frequency of the compressor is changed;
and the fifth preset time is less than the fourth preset time.
8. The constant-temperature dehumidification control method according to claim 4, 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.
9. The constant-temperature dehumidification control method according to claim 8, 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.
10. The constant-temperature dehumidification control method according to claim 8, 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 humidity is larger than or equal to the first preset humidity, the frequency of the compressor in the heating operation process of the air conditioner is the first frequency F1，
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 second frequency F2，
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 a third frequency F3，
F1＞F2＞F3。
11. The constant-temperature dehumidification control method according to claim 10, wherein F1、F2、F3All detected values T of outdoor temperature sensoroutThe correlation function of (2).
12. The constant-temperature dehumidification control method according to claim 5, wherein the step S53 further comprises:
the control unit controls the rotating speed of the indoor fan to be reduced to a preset lowest gear.
13. According to claimThe constant temperature dehumidification control method of claim 5, wherein in the step S53, if T is detectedP≥T1-a first preset unit value, then the control unit also controls the auxiliary electric heater to be switched on.
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| CN111412591B (en) * | 2020-03-12 | 2021-11-19 | 海信（山东）空调有限公司 | Constant-temperature dehumidification control method and device for air conditioning system, air conditioning system and medium |
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| CN112432239B (en) * | 2020-10-28 | 2022-05-31 | 重庆海尔空调器有限公司 | Constant temperature dehumidification system for air conditioner, control method and air conditioner |
| CN112747436B (en) * | 2021-01-04 | 2022-06-14 | 青岛海尔空调器有限总公司 | Control method for dehumidification of air conditioner and air conditioner |
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Address after: 266100 Zhuzhou Road, Laoshan District, Qingdao, Shandong Province, No. 151 Applicant after: HISENSE (SHANDONG) AIR-CONDITIONING Co.,Ltd. Address before: 266736 Hisense Road 1, South Village Town, Pingdu City, Qingdao, Shandong Applicant before: HISENSE (SHANDONG) AIR-CONDITIONING Co.,Ltd. |
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