KR101528640B1 - Controlling Method Of Hybrid Desiccant Dehumidification Apparatus - Google Patents
Controlling Method Of Hybrid Desiccant Dehumidification Apparatus Download PDFInfo
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- KR101528640B1 KR101528640B1 KR1020150065118A KR20150065118A KR101528640B1 KR 101528640 B1 KR101528640 B1 KR 101528640B1 KR 1020150065118 A KR1020150065118 A KR 1020150065118A KR 20150065118 A KR20150065118 A KR 20150065118A KR 101528640 B1 KR101528640 B1 KR 101528640B1
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- air
- condenser
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- dehumidifying
- heated
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- F24F11/0015—
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- F24F11/022—
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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
- F24F3/1405—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 in which the humidity of the air is exclusively affected by contact with the evaporator of a closed-circuit cooling system or heat pump circuit
Abstract
Description
The present invention relates to a method for controlling the operation of a hybrid desiccant dehumidifying device for controlling the condensation condensation heat, and more particularly, to a dehumidifying and dehumidifying device for dehumidifying and warming air by cooling and dehumidifying air using an evaporator, The regenerating air heated by using the condensation heat is supplied to the regenerative heat source of the desiccant dehumidifier so that the high temperature and high humidity air desorbed by the heat exchange with the desiccant rotor can be exhausted to the outside and the refrigerator and the desiccant dehumidifier The present invention also relates to a method of controlling the operation of a hybrid desiccant dehumidifying device for controlling the condensation heat of condensation so that the device can be made more compact and the operation cost can be greatly reduced.
Conventionally, in the conventional desiccant dehumidifier, energy for heating such as electricity is generally used in a regeneration process in which the regeneration air is heated after the desiccant rotor for adsorbing moisture and then the desiccant rotor is heated to desorb water from the desiccant rotor . At this time, the dehumidification amount control of the dehumidifier is performed by regulating the temperature of the regeneration air.
It is also common to use a desiccant dehumidifier after the air is first wetted with an evaporator and the heat absorbed by the evaporator is discharged to the outside through the condenser.
The conventional hybrid desiccant dehumidifier can reduce the heating energy for regeneration of the desiccant dehumidifier and save the operation cost by allowing the heat of condensation of the condenser to be used as the energy for heating in the regenerating process of the desiccant rotor. However, in the hybrid desiccant dehumidifier, The regeneration heat of the condenser for heating the regeneration air can not be controlled, and it is difficult to control the temperature of the regeneration air, so that the dehumidification amount of the dehumidifier can not be controlled.
Further, when the condensation pressure increases due to a decrease in the air volume of the regeneration air passing through the condenser for heating the regeneration air in the hybrid desiccant dehumidifier or a rise in the temperature, the compressor is stopped and the cooling dehumidification and de- There is a disadvantage that all the regeneration processes of the Kantro rotor are stopped.
Further, when the condensation heat of the condenser in the hybrid desiccant dehumidifier is larger than the heat required for regenerating the desiccant rotor, a separate additional auxiliary condenser and a blower for the auxiliary condenser must be provided, which increases the size of the dehumidifier and raises the operation cost .
Disclosure of Invention Technical Problem [8] Accordingly, the present invention has been made in order to solve the problems of the related art, and it is an object of the present invention to provide a dehumidifier and a dehumidifier for cooling and dehumidifying air, The dehumidifier and the desiccant dehumidifier can be regenerated (dehumidified) by supplying the heated air to the regenerative heat source of the desiccant dehumidifier to heat-exchange the cooled air, , The apparatus is made more compact and the operation cost can be drastically reduced. A hybrid desiccant dehumidifying device for controlling the condensation heat of the condenser, which does not use the auxiliary condenser and the auxiliary condenser blower and can control the dehumidification amount of the dehumidifier, And to provide a driving control method of the same.
According to an aspect of the present invention, there is provided a method for controlling operation of a hybrid desiccant dehumidifying device for controlling condensate condensation heat according to the present invention, including: a first air introduction line (1) through which air is introduced; An evaporator (V) installed in the first air introduction line (1) and cooling the air by heat exchange; A compressor P for compressing the refrigerant passing through the evaporator V; A condenser (C) for condensing the refrigerant having passed through the compressor (P); An expansion valve (E) for expanding the refrigerant passing through the condenser (C); A desiccant rotor (R) for dehumidifying and warming the air cooled in the evaporator (V); A heated air introduction line (L1) for heating the air introduced from the second air introduction line (2) connected to the condenser (C) by using condensation heat and then supplying the air to the desiccant rotor (R); An exhaust line (L3) for regenerating (desorbing) the desiccant rotor (R), for recovering and discharging the regenerated air after the heat exchange; A bypass line BP1 connecting the heated air introduction line L1 and the exhaust line L3 to bypass the desiccant rotor R; An air volume damper (CV) installed in the bypass line (BP1) and controlling the amount of air bypassed; An air supply line L2 for supplying the dehumidified and heated air through the desiccant rotor R to the dehumidifying space T; A dehumidifying space T for receiving the processing air supplied from the air supply line L2 and maintaining the internal temperature and humidity; A ventilation line (3) connected to the first air introduction line (1) so that air in the dehumidification space (T) is introduced into the dehumidifier; The dehumidifying space T and the dehumidifying space T. The temperature and humidity in the dehumidifying space T are controlled by selectively performing the cooling, dehumidifying and warming operations of the air introduced in accordance with the temperature and humidity conditions of the dehumidifying space T, And a control unit for controlling the condensation condensation heat to be maintained at a target value, wherein the control unit controls the operation of the dehumidification space T according to the temperature and humidity conditions of the dehumidification space T, , And the dehumidifying amount of the desiccant rotor (R) is adjusted, and the process air is generated and supplied to the dehumidifying space (T) so that the temperature and the humidity in the dehumidifying space (T) The compressor P, the condenser C, the evaporator V and the expansion valve E are operated to maintain the temperature and humidity of the dehumidifying space T in the dehumidifying space control operation mode, a step of cooling the air to be introduced from the input line (1); B) a step b of supplying the heated air heat-exchanged to the arrangement of the condenser (C) to the desiccant rotor (R) through the heated air introduction line (L1); (C) a step of supplying heat to the dehumidifying space (T) through the air supply line (L2) by reheating the heated air supplied to the desiccant rotor (R) A d step of moving a part of the heated air heated by the condenser (C) to the bypass line (BP1) and directly supplying it to the exhaust line (L3); Thereby performing the cooling and dehumidification in parallel in the dehumidification amount adjustment operation control mode; The amount of air bypassing the desiccant rotor (R) controls the opening degree of the air damper (CV) installed in the bypass line (BP1).
The operation control method of the hybrid desiccant dehumidifier for controlling the condensation condensation heat according to the present invention comprises: a first air introduction line (1) into which air is introduced; An evaporator (V) installed in the first air introduction line (1) and cooling the air by heat exchange; A compressor P for compressing the refrigerant passing through the evaporator V; A condenser (C) for condensing the refrigerant having passed through the compressor (P); An expansion valve (E) for expanding the refrigerant passing through the condenser (C); A desiccant rotor (R) for dehumidifying and warming the air cooled in the evaporator (V); A heated air introduction line (L1) for heating the air introduced from the second air introduction line (2) connected to the condenser (C) by using condensation heat and then supplying the air to the desiccant rotor (R); An exhaust line (L3) for regenerating (desorbing) the desiccant rotor (R), for recovering and discharging the regenerated air after the heat exchange; A bypass line BP1 connecting the heated air introduction line L1 and the exhaust line L3 to bypass the desiccant rotor R; An air volume damper (CV) installed in the bypass line (BP1) and controlling the amount of air bypassed; An air supply line L2 for supplying the dehumidified and heated air to the dehumidifying space T through the desiccant rotor R; A dehumidifying space T for receiving the processing air supplied from the air supply line L2 and maintaining the internal temperature and humidity; A ventilation line (3) connected to the first air introduction line (1) so that air in the dehumidification space (T) is introduced into the dehumidifier; The dehumidifying space T and the dehumidifying space T. The temperature and humidity in the dehumidifying space T are controlled by selectively performing the cooling, dehumidifying and warming operations of the air introduced in accordance with the temperature and humidity conditions of the dehumidifying space T, And a control unit for controlling the condensation condensation heat to be maintained at a target value, wherein the control unit controls the operation of the dehumidification space T according to the temperature and humidity conditions of the dehumidification space T, (C), the evaporator (V), the expansion valve (V), and the evaporator (V) to maintain the operation of the dehumidifying device in the emergency operation control mode. E) to cool the air introduced from the first air introduction line (1); B) a step b of supplying the heated air heat-exchanged to the arrangement of the condenser (C) to the desiccant rotor (R) through the heated air introduction line (L1); (C) a step of supplying heat to the dehumidifying space (T) through the air supply line (L2) by reheating the heated air supplied to the desiccant rotor (R) Measuring the temperature of the heated air heated by the condenser (C) in the step b and comparing it with the set value to detect whether or not the set value is abnormal; Measuring a refrigerant pressure of the condenser (C) and comparing it with a set value to detect whether or not the set value is abnormal; The air damper CV provided in the bypass line BP1 is fully opened to increase the amount of the heated air heated by the condenser C and the exhaust line L3 is opened, G < / RTI >process; The dehumidifier is operated in the emergency operation control mode so as to increase the amount of air passing through the condenser C so that the condensation pressure does not rise above the set value to cool the condenser C to lower the pressure of the condenser C .
According to the operation control method of the hybrid desiccant dehumidifying device for controlling the condensation condensation heat according to the present invention, the air can be further dehumidified and warmed by the desiccant rotor using the condensation heat of the condenser after cooling by the evaporator, It is possible to maintain the temperature and humidity more efficiently while reducing the consumption.
In addition, the hybrid desiccant dehumidifier can not control the condensation temperature of the condenser for heating the air for regeneration, so that it is difficult to control the temperature of the regeneration air, so that the disadvantage that the dehumidification amount of the dehumidifier can not be controlled can be solved.
Further, when the condensation pressure increases due to a decrease in the air volume of the regeneration air passing through the condenser for heating the regeneration air in the hybrid desiccant dehumidifier or a rise in the temperature, the compressor is stopped, It is possible to prevent the restoration process of the Kantro rotor from being stopped altogether.
1 is a block diagram of a conventional hybrid desiccant dehumidifier.
2 is a schematic view of a hybrid desiccant dehumidifier using a conventional auxiliary condenser.
3 is a block diagram of a hybrid desiccant dehumidifier for controlling condensation condensation heat according to the present invention.
FIG. 4 is a view showing a first embodiment of a hybrid desiccant dehumidifier for controlling the condensation condensation heat according to the present invention. FIG.
5 is a flowchart showing the first embodiment of FIG.
FIG. 6 is a view showing a second embodiment of a hybrid desiccant dehumidifier for controlling the condensation condensation heat according to the present invention. FIG.
FIG. 7 is a flowchart showing the second embodiment of FIG. 6; FIG.
8 is a view showing a third embodiment of a hybrid desiccant dehumidifier for controlling the condensation condensation heat according to the present invention.
FIG. 9 is a flowchart showing the third embodiment of FIG. 8; FIG.
Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.
In the following description, O.A denotes outside air, E.A denotes exhaust, R.A denotes ventilation, and S.A denotes air supply. The bold lines indicate actual fluid movement, and the thin lines indicate no fluid flow.
First, the configuration of the hybrid desiccant dehumidifier for controlling the condensation condensation heat according to the present invention will be described.
FIG. 1 is a configuration diagram of a hybrid desiccant dehumidifier without using an auxiliary condenser and a blower for an auxiliary condenser. FIG. 2 is a schematic view of a hybrid desiccant dehumidifier according to an embodiment of the present invention. FIG. 1 is a configuration diagram showing a hybrid desiccant dehumidifier using a blower for a condenser; FIG.
3 is a block diagram of a hybrid desiccant dehumidifier for controlling condensation condensation heat according to the present invention.
As shown in FIG. 3, the hybrid desiccant dehumidifier for controlling the condensation condensation heat according to the present invention comprises: a first
The first air introduction line (1) is a duct for introducing air into the evaporator (V). The evaporator (V) is installed in the first air introduction line (1) and cools the air by heat exchange.
That is, the evaporator (V) has a cooling coil through which refrigerant is circulated and an air supply line for supplying air to the cooling coil, so that the air introduced by the air supply line is cooled while passing through the cooling coil.
A condenser C for condensing the refrigerant that has passed through the compressor P and a condenser C for expanding the refrigerant passing through the condenser C so as to compress the refrigerant passing through the evaporator V, (E) to be introduced into the refrigerator.
Since the desiccant rotor R is a known technology, a detailed description thereof will be omitted.
Meanwhile, the desiccant rotor (R) of the present invention is divided into a treating section and a regenerating section, and the area ratio can be divided into 1: 1 or 5: 3.
The treatment section includes an adsorbent such as silica gel to adsorb moisture contained in the air passing through the desiccant rotor (R) to perform a dehumidifying function. The regeneration section adsorbs the heated regeneration air through the heat exchanger The water can be desorbed.
Further, the regeneration air supplied to the regeneration section is in a highly humid state after the heat exchange, the temperature is also lowered, and is discharged to the outside through the exhaust line L3.
On the other hand, a bypass line BP1 is further provided to interconnect the heated air introduction line L1 and the exhaust line L3. The bypass line BP1 supplies a part of the heated air heated by the condenser C to the desiccant rotor R by directly supplying the desiccant rotor R to the exhaust line L3, It is possible not to supply more air than necessary, so that it is not necessary to use the auxiliary condenser and the auxiliary condenser blower.
The bypass line BP1 supplies a portion of the heated air heated by the condenser C to the exhaust line L3 without supplying the desiccant rotor R to the desiccant rotor R, So that the dehumidifying amount can be controlled.
When the refrigerant pressure of the condenser C rises above a predetermined value or the air temperature of the heated air introduction line L1 at the rear end of the condenser C rises above a predetermined value, The air damper CV of the pass line BP1 is fully opened so that the amount of air passing through the condenser C can be increased.
On the other hand, the first air introduction line (1) is further provided with a separate cold water coil (CC) or a separate evaporator (V1) to increase the cooling amount of air passing therethrough.
On the other hand, the cold air supply line (L2) is provided with a separate cold water coil (CC1) or a separate evaporator (V2) to further cool the air passing through it.
On the other hand, the air supply line (L2) is provided with a separate heating coil (H1) to further heat the air passing therethrough. The heating source of the heating coil may be hot water, steam, or electricity.
The operation control method of the hybrid desiccant dehumidifier for controlling the condensation condensation heat according to the present invention will be described.
According to the present invention, the control unit selectively performs cooling, dehumidifying, heating, and air-blowing operations of the air according to the temperature and humidity conditions of the dehumidifying space T, while controlling the amount of dehumidification of the desiccant rotor R, And the temperature and humidity in the dehumidifying space T can be maintained at a target value by supplying the dehumidified space T to the dehumidifying space T. [
The present invention is divided into three types of control, namely, basic operation control and emergency operation control, depending on the humidity of the dehumidifying space (T).
That is, the basic operation control is performed by the operation control method in which the difference between the target humidity of the dehumidification space T and the present humidity of the dehumidification space T is large, T) is less than or equal to the difference in the present humidity, there are two types of operation control methods, namely, the operation control method in which the dehumidification capacity is reduced.
On the other hand, the emergency operation control is a control that operates when the refrigerant pressure of the condenser C or the air temperature of the heated air introduction line L1, which is the rear end of the condenser C, rises above the set value.
FIG. 4 is a block diagram showing a first embodiment of a hybrid desiccant dehumidifying device for controlling the condensation condensation heat according to the present invention, and FIG. 5 is a flowchart showing the first embodiment of FIG.
The condenser C, the evaporator V, the expansion valve V, the evaporator V, and the evaporator V, in order to maintain the temperature and humidity of the dehumidifying space T at this time as a basic maximum dehumidifying amount operation control mode as shown in FIG. 4 and FIG. E) to cool the air introduced from the first air introduction line (1); B) a step b of supplying the heated air heat-exchanged to the arrangement of the condenser (C) to the desiccant rotor (R) through the heated air introduction line (L1); And a step c) of supplying the dehumidified air to the dehumidifying space T through the air supply line L2 by exchanging heat between the heated air supplied to the desiccant rotor R of the step b and the outside air of the step a Maximum dehumidification amount The cooling and dehumidification are performed in the operation control mode.
In the step b, the heated air is heated to about 55 to 80 ° C.
In the maximum dehumidifying amount operation control mode, all of the heated air heated and exchanged with the array of the condenser (C) is supplied to the decanter rotor (R) through the heated air introducing line (L1) and adsorbed to the desiccant rotor So that the dehumidifying amount of the dehumidifier is maximized.
On the other hand, when the condensation heat of the condenser C is larger than the required amount in the desiccant rotor R, only a part of the heated air heat-exchanged with the arrangement of the condenser C in the maximum dehumidification amount operation control mode is introduced Is supplied to the desiccant rotor R through the line L1 to desorb the moisture adsorbed by the desiccant rotor R at the maximum to operate the dehumidifier so that the dehumidification amount of the dehumidifier is maximized.
FIG. 6 is a configuration diagram showing a second embodiment of a hybrid desiccant dehumidifier for controlling the condensation condensation heat according to the present invention, and FIG. 7 is a flowchart showing the second embodiment of FIG.
As shown in FIGS. 6 and 7, when the difference between the target humidity of the dehumidifying space T and the current humidity of the dehumidifying space T is small or is absent, the dehumidifying capacity is reduced and operated.
A step of activating the compressor (P), the condenser (C), the evaporator (V) and the expansion valve (E) to cool the air introduced from the first air introduction line (1); B) a step b of supplying the heated air heat-exchanged to the arrangement of the condenser (C) to the desiccant rotor (R) through the heated air introduction line (L1); (C) a step of supplying heat to the dehumidifying space (T) through the air supply line (L2) by reheating the heated air supplied to the desiccant rotor (R) A d step of moving a part of the heated air heated by the condenser (C) to the bypass line (BP1) and directly supplying it to the exhaust line (L3); The cooling and dehumidification are performed in the dehumidifying amount control operation mode.
Therefore, in the dehumidifying amount control operation mode through the step d, only a part of the heated air heat-exchanged with the arrangement of the condenser C is supplied to the desiccant rotor R through the heated air introduction line L1, The dehumidification amount of the dehumidifier is reduced and the operation is performed. The amount of air bypassing the decanter rotor R is controlled by controlling the opening degree of the air damper CV installed in the bypass line BP1.
FIG. 8 is a block diagram showing a third embodiment of a hybrid desiccant controller for controlling the condensation condensation heat according to the present invention, and FIG. 9 is a flowchart showing the third embodiment of FIG.
8 and 9, when the refrigerant pressure of the condenser C rises above the set value or when the air temperature of the rear end heated air introduction line L1 of the condenser C rises above the set value, The air amount damper CV provided in the line BP1 is fully opened to operate in the emergency operation control mode in which the amount of air passing through the condenser C is maximized.
A step of activating the compressor (P), the condenser (C), the evaporator (V) and the expansion valve (E) to cool the air introduced from the first air introduction line (1); B) a step b of supplying the heated air heat-exchanged to the arrangement of the condenser (C) to the desiccant rotor (R) through the heated air introduction line (L1); (C) a step of supplying heat to the dehumidifying space (T) through the air supply line (L2) by exchanging heat between the heated air supplied to the desiccant rotor (R) (B) measuring the temperature of the heated air heated by the condenser (C) at all times, comparing the measured temperature with the set value, and detecting whether the temperature is higher than the set value; Measuring a refrigerant pressure of the condenser (C) and comparing it with a set value to detect whether the refrigerant pressure is higher than a set value; The air damper CV provided in the bypass line BP1 is fully opened to increase the amount of the heated air heated by the condenser C and the exhaust line L3 ), And then the dehumidifier is operated in the emergency operation control mode.
Accordingly, the air damper CV is fully opened to increase the amount of air passing through the condenser C to cool the condenser C to prevent the pressure of the condenser C from rising The operation is continued in the emergency operation control mode in which the dehumidifier is not stopped and the operation can be continued.
Although the present invention has been described in connection with the above-mentioned preferred embodiments, it will be apparent to those skilled in the art that various modifications and variations can be made without departing from the spirit and scope of the invention, It is obvious that the claims fall within the scope of the claims.
1: first air introduction line 2: second air introduction line
3: Ventilation line
C: Condenser E: Expansion side
P: compressor V: evaporator
R: Desiccant rotor T: Dehumidification space
L1: heated air introduction line L2: air supply line
L3: Exhaust line
Claims (2)
The control unit selectively performs cooling, dehumidifying, heating, and air-blowing operations of the air according to the temperature and humidity conditions of the dehumidifying space T, while controlling the amount of dehumidification of the desiccant rotor R, The temperature and the humidity in the dehumidifying space T are maintained at a target value by supplying the air into the space T,
In order to maintain the temperature and humidity of the dehumidifying space T in the dehumidifying amount control operation mode,
A step of activating the compressor (P), the condenser (C), the evaporator (V) and the expansion valve (E) to cool the air introduced from the first air introduction line (1);
B) a step b of supplying the heated air heat-exchanged to the arrangement of the condenser (C) to the desiccant rotor (R) through the heated air introduction line (L1);
(C) a step of supplying heat to the dehumidifying space (T) through the air supply line (L2) by reheating the heated air supplied to the desiccant rotor (R)
(D) a step of moving a part of the heated air heated by the condenser (C) to the exhaust line (L3) by moving it to the bypass (BP1), thereby performing dehumidification Lt; / RTI >
The amount of air bypassing the desiccant rotor (R) is controlled by adjusting the opening degree of the air damper (CV) installed in the bypass line (BP1). The operation control of the hybrid desiccant dehumidifier Way.
The control unit selectively performs cooling, dehumidifying, heating, and air-blowing operations of the air according to the temperature and humidity conditions of the dehumidifying space T,
In order to maintain the operation of the dehumidifier in the emergency operation control mode,
A step of activating the compressor (P), the condenser (C), the evaporator (V) and the expansion valve (E) to cool the air introduced from the first air introduction line (1);
B) a step b of supplying the heated air heat-exchanged to the arrangement of the condenser (C) to the desiccant rotor (R) through the heated air introduction line (L1);
(C) a step of supplying heat to the dehumidifying space (T) through the air supply line (L2) by reheating the heated air supplied to the desiccant rotor (R)
Measuring the temperature of the heated air heated by the condenser (C) in the step b and comparing it with the set value to detect whether or not the set value is abnormal;
Measuring a refrigerant pressure of the condenser (C) and comparing it with a set value to detect whether or not the set value is abnormal;
The air damper CV provided in the bypass line BP1 is fully opened to increase the amount of the heated air heated by the condenser C and the exhaust line L3 is opened, The dehumidifier is operated in the emergency operation control mode to increase the amount of air passing through the condenser C so that the condensation pressure does not rise above the set value to cool the condenser C, (C) is controlled so as to lower the pressure of the condensed water.
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| CN110785615A (en) * | 2017-04-18 | 2020-02-11 | 北狄空气应对加拿大公司 | Desiccant enhanced evaporative cooling system and method |
| KR20200046697A (en) * | 2018-10-25 | 2020-05-07 | (주)미공 | A apparatus for dehumidifying |
| KR102191089B1 (en) | 2019-07-31 | 2020-12-15 | 박충현 | IoT based smart hybrid dehumidifier system |
| KR102191087B1 (en) | 2019-06-28 | 2020-12-15 | 박충현 | Dry dehumidifier system and control method thereof |
| CN114992725A (en) * | 2022-06-20 | 2022-09-02 | 珠海格力电器股份有限公司 | Dehumidification module, dehumidifier and dehumidification control method |
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