Air conditioning device

Abstract

The application discloses an air conditioning device, comprising: an outer shell body, an outdoor air inlet, an outdoor air outlet, an indoor air outlet and an indoor return air outlet are formed on the outer shell body, a first heat exchange cavity, a second heat exchange cavity, a first humidity adjusting cavity and a second humidity adjusting cavity are formed in the outer shell body; a first heat exchanger; a second heat exchanger; a first suction accessory; a second suction accessory; a first switching device; a second switching device; the indoor return air outlet is communicated with the first heat exchange cavity, and the outdoor air inlet is communicated with the second heat exchange cavity; a compressor; a control module is used for controlling the communication state of each switching device and / or the refrigerant flow direction of a refrigerant circulation flow path. The application has high integration degree of each component and small occupied space. In addition, the refrigerant flow direction switching is not required when the suction accessory needs to be regenerated, the logic is simpler, and the execution is more reliable.

Description

Technical Field

[0001] This application relates to the field of air conditioning technology, and more particularly to an air conditioning device. Background Technology

[0002] As people's living standards improve, they are paying more and more attention to the quality of their indoor environment and need to regulate the air. Air conditioning includes temperature and humidity control, and air quality and comfort are increasingly valued by every household and various commercial and office spaces.

[0003] Currently, some fresh air products in the industry have dehumidification functions, but humidification requires a separate humidification module and a corresponding water supply system. For example, wet membrane humidification and steam humidification both require a water supply system. Solid adsorption humidification has technical problems such as expensive materials, high cost, large rotor size, large material usage, and large space occupation within the device.

[0004] In addition, the dehumidification of adsorption materials also has the following problems: when the outdoor temperature is high in summer, such as above 40°C, the adsorption temperature of the adsorption element will be high, resulting in poor dehumidification. Currently, some solutions address this problem by controlling the frequency of the cooling system. However, if the problem is solved by increasing the frequency of the cooling system, it will lead to a significant decrease in the system's energy efficiency. Summary of the Invention

[0005] To address the technical problem in existing humidity control devices that require separate humidification modules and corresponding water supply systems for humidification, embodiments of the present invention provide an air humidification device. By incorporating a refrigerant circulation system and a rotatable adsorption wheel, it can humidify or dehumidify the air in the air inlet channel while reducing the overall size. Furthermore, by including a water heater tank, the hot water in the tank can be used to heat the adsorption wheel for drying, thereby regenerating the adsorption wheel and ensuring that it maintains a high adsorption capacity during dehumidification.

[0006] To achieve the above objectives, the embodiments of the present invention adopt the following technical solutions:

[0007] This invention provides an air conditioning device, comprising:

[0008] The outer shell has an outdoor air inlet, an outdoor air outlet, an indoor air supply outlet, and an indoor air return outlet. The outer shell also has a first heat exchange chamber, a second heat exchange chamber, a first humidity control chamber, and a second humidity control chamber.

[0009] The first heat exchanger is disposed in the first heat exchange chamber;

[0010] The second heat exchanger is installed in the second heat exchange chamber;

[0011] The first adsorption element is disposed in the first humidity regulating cavity;

[0012] The second adsorption element is disposed in the second humidity regulating cavity;

[0013] The first reversing device is used to control the connection status between the two humidity regulating chambers and the two heat exchange chambers respectively;

[0014] The second reversing device is used to control the connection status between the outdoor exhaust vent and the indoor air supply vent and the two humidity control chambers, respectively.

[0015] A heat recovery core is disposed between the outdoor air inlet and the indoor air return inlet and the heat exchange chamber, and is used to exchange heat with the airflow before it enters the heat exchange chamber.

[0016] The indoor return air inlet is connected to the first heat exchange chamber, and the outdoor air inlet is connected to the second heat exchange chamber.

[0017] The compressor is connected to the first heat exchanger and the second heat exchanger respectively through the first four-way valve to form a refrigerant circulation path;

[0018] The control module is used to control the connection status of each reversing device and / or the refrigerant flow direction in the refrigerant circulation path.

[0019] In some embodiments,

[0020] The heat recovery core includes:

[0021] The first heat exchange channel is connected at both ends to the indoor return air vent and the first heat exchange chamber, respectively.

[0022] The second heat exchange channel is connected at both ends to the outdoor air inlet and the second heat exchange chamber, respectively.

[0023] In some embodiments, the D port of the first four-way valve is connected to the discharge port 171 of the compressor, and the S port of the first four-way valve is connected to the suction port of the compressor.

[0024] The C port of the first four-way valve is connected to the first port of the first heat exchanger through the first solenoid valve, and the E port of the first four-way valve is connected to the second port of the second heat exchanger.

[0025] The second port of the first heat exchanger is connected to the first port of the second heat exchanger via the first electronic expansion valve;

[0026] The control module is configured to control the refrigerant flow direction in the refrigerant circulation path according to the air conditioning mode. The air conditioning mode includes a dehumidification mode and a humidification mode. When the conditioning mode is dehumidification mode, the control module is configured to:

[0027] Turn on the compressor, control the first four-way valve to connect the D port of the first four-way valve to its C port and the E port of the first four-way valve to its S port, and adjust the opening of the first electronic expansion valve so that the first heat exchanger acts as a condenser and the second heat exchanger acts as an evaporator.

[0028] When the adjustment mode is humidification mode, the control module is configured as follows:

[0029] Turn on the compressor, control the first four-way valve to connect its D port to its E port and its C port to its S port, and adjust the opening of the first electronic expansion valve so that the first heat exchanger acts as an evaporator and the second heat exchanger acts as a condenser.

[0030] In some embodiments, the air conditioning device further includes:

[0031] An outdoor heat exchanger, the first port of which is connected to the C port of the first four-way valve, and the second port of which is connected between the second port of the first heat exchanger and the first electronic expansion valve through a second solenoid valve.

[0032] The control module also includes a configuration as follows:

[0033] Obtain the supply air temperature Tsa and supply air humidity dsa at the indoor air outlet;

[0034] Obtain the target temperature Tset indoor and the target moisture content dset indoor;

[0035] The temperature and humidity determination steps are to determine whether the temperature limit (Tsa) and humidity limit (dsa) are met.

[0036] If the condition is not met, the compressor frequency is increased and it is determined whether the compressor frequency has reached the upper limit. If the judgment condition is still not met even when the compressor frequency reaches the upper limit, the second solenoid valve is opened and the outdoor fan is opened at a volume less than the rated air volume.

[0037] Return to the temperature and humidity judgment step. If the judgment conditions are met, maintain the current state until the supply air temperature Tsa and supply air humidity dsa reach the set values, and then control the compressor to reduce the frequency. If the judgment conditions are not met, increase the speed of the outdoor fan to start at the rated air volume.

[0038] Return to the temperature and humidity judgment steps again. If the judgment conditions still cannot be met, reduce the air intake.

[0039] In some embodiments, the air conditioning device further includes:

[0040] The second four-way valve has its D port connected to the first port of the outdoor heat exchanger, its E port connected to the C port of the first four-way valve, its C port connected to the E port of the first four-way valve, and its S port blocked.

[0041] The second electronic expansion valve is connected between the outdoor heat exchanger and the second solenoid valve;

[0042] In dehumidification mode or humidification mode, when it is necessary to control the opening of the second solenoid valve, it also includes controlling the full opening of the second electronic expansion valve and controlling the D port of the second four-way valve to connect with its E port.

[0043] The air conditioning mode also includes a defrost mode, which includes a first heat exchanger defrost mode and an outdoor heat exchanger defrost mode.

[0044] In the first heat exchanger defrosting mode, the control module is configured as follows:

[0045] Close the first electronic expansion valve;

[0046] Turn on the compressor, control the first four-way valve to connect its D port to its C port and its E port to its S port, control the second four-way valve to connect its D port to its C port, and adjust the opening of the second electronic expansion valve so that the first heat exchanger acts as a condenser and the outdoor heat exchanger acts as an evaporator.

[0047] In the outdoor heat exchanger defrosting mode, the control module is configured as follows:

[0048] Close the first electronic expansion valve;

[0049] Turn on the compressor, control the first four-way valve to connect its D port to its E port and its C port to its S port, control the second four-way valve to connect its D port to its C port, and adjust the opening of the second electronic expansion valve so that the first heat exchanger acts as an evaporator and the outdoor heat exchanger acts as a condenser.

[0050] In some embodiments, the air conditioning mode further includes a non-cooling and dehumidification mode;

[0051] The control module is configured as follows in the non-cooling and dehumidification mode:

[0052] Close the second electronic expansion valve and open the first solenoid valve;

[0053] Obtain the dew point temperature TL13 at the inlet liquid pipe of the second heat exchanger;

[0054] Get the temperature at the inlet liquid pipe of the second heat exchanger, which is the evaporation temperature Te, and determine whether the difference between the evaporation temperature Te and the dew point temperature TL13 meets the set range.

[0055] When the difference between Te and TL13 does not meet the set range, the compressor frequency is reduced. If the compressor frequency has reached the lower limit and the difference between Te and TL13 still does not meet the set range, the exhaust fan speed is reduced until the difference between Te and TL13 meets the set range.

[0056] Determine if the supply air temperature Tsa meets the set range. If it does, maintain the current state until the difference between the supply air temperature Tsa and the target temperature Tset indoor is within the set error range, and then control the compressor to reduce the frequency. If the supply air temperature Tsa does not meet the set range, control the blower to reduce the speed.

[0057] Determine whether the supply air moisture content (dsa) meets the set range. If it does, maintain the current state; if the supply air moisture content (dsa) does not meet the set range, control the compressor to increase its frequency.

[0058] In some embodiments, the condition for entering the non-cooling dehumidification mode is: obtaining the relative humidity and air temperature of the air entering through the outdoor air inlet, determining whether the relative humidity and air temperature of the air entering meet the set values, and if so, entering the non-cooling dehumidification control mode.

[0059] In some embodiments, obtaining the dew point temperature TL13 at the inlet liquid pipe of the second heat exchanger includes: obtaining the inlet air temperature Toa and the inlet air moisture content doa, and then calculating the temperature and moisture content of the airflow after the inlet air passes through the heat recovery core based on the enthalpy efficiency and temperature efficiency of the heat recovery core, which are respectively the first temperature T13 and the first moisture content d13, and calculating the corresponding dew point temperature TL13 based on T13 and d13.

[0060] In some embodiments, the air conditioning mode further includes a deep dehumidification mode;

[0061] The control module in deep dehumidification mode is configured as follows:

[0062] Open the first solenoid valve;

[0063] The first four-way valve's D port is connected to its C port, and the second four-way valve's D port is connected to its E port.

[0064] Obtain the dew point temperature TL13 at the inlet liquid pipe of the second heat exchanger;

[0065] Get the temperature at the inlet liquid pipe of the second heat exchanger, which is the evaporation temperature Te, and determine whether the difference between the evaporation temperature Te and the dew point temperature TL13 meets the set range.

[0066] When the difference between Te and TL13 meets the set range, the state of the compressor and the first electronic expansion valve remains unchanged; if it does not meet the set range, the compressor frequency is increased while the opening of the first electronic expansion valve is adjusted until the difference between Te and TL13 meets the set range.

[0067] Determine whether the supply air temperature Tsa and supply air moisture content dsa meet the set range respectively. If they do, control the compressor and the first electronic expansion valve to remain unchanged. If they do not meet the set range, return to the step of determining whether the difference between the evaporation temperature Te and the dew point temperature TL13 meets the set range.

[0068] In some embodiments, the criteria for entering the deep dehumidification mode are:

[0069] Get the inlet air temperature Toa and the fresh air humidity doa, and determine whether the inlet air temperature Toa and the fresh air humidity doa have reached the set range respectively. If so, determine whether the set supply air temperature Tsa,set and the set supply air humidity are not greater than their respective set limits. If the set supply air temperature Tsa,set and the set supply air humidity are not greater than their respective set limits, then enter the deep dehumidification mode.

[0070] In some embodiments, the method for obtaining the dew point temperature TL13 at the inlet liquid pipe of the second heat exchanger is as follows: obtain the inlet air temperature Toa and the fresh air moisture content dOa, and then calculate the temperature and moisture content of the fresh air after passing through the core, i.e. the temperature and moisture content before the second heat exchanger, based on the enthalpy efficiency and temperature efficiency of the total heat core, and denoted as T13 and d13, and calculate the corresponding dew point temperature TL13 based on T13 and d13.

[0071] In some embodiments, the control module further includes a configuration for: controlling the first reversing device and the second reversing device to operate, connecting the indoor air outlet to the second heat exchange chamber through one of the first humidity regulating chamber and the second humidity regulating chamber, and connecting the outdoor air outlet to the first heat exchange chamber through the other of the first humidity regulating chamber and the second humidity regulating chamber.

[0072] In some embodiments, the control module further includes a function configured to control the first reversing device and the second reversing device to switch directions based on the humidity content of the air supplied from the indoor air outlet, thereby exchanging the humidity regulating chambers that are respectively connected to the indoor air outlet and the outdoor air outlet.

[0073] In some embodiments, the air conditioning device further includes:

[0074] A temperature and humidity sensor is installed at the indoor air outlet to detect the humidity content of the supplied air.

[0075] The control method for commutating the first commutator and the second commutator includes:

[0076] Calculate the rate of change of supply air moisture content. When the rate of change of supply air moisture content is not greater than the first set value, and the difference between supply air moisture content and the maximum moisture content in this reversing cycle is not greater than the second set value, control the first reversing device and the second reversing device to switch directions.

[0077] Before controlling the first and second reversing devices to reverse, the method also includes controlling the blower and exhaust fan to reduce their speed.

[0078] After controlling the first and second reversing devices to switch directions, the system also includes controlling the supply fan and exhaust fan to increase their speed, so that the air volume can be increased to the rated air volume or the current set air volume within a set time.

[0079] The air conditioning device of this invention, by setting a reversing device, can controllably switch the humidity regulating chamber connected to the first and second heat exchange chambers. When the dehumidification or humidification capacity of the adsorbent in the humidity regulating chamber through which the incoming air passes decreases, by controlling the switching of the humidity regulating chamber connected to the first and second heat exchange chambers, the adsorbent that the incoming air originally passed through becomes the one that the exhaust air passes through. The exhaust air can regenerate the adsorbent, that is, in dehumidification mode, it dries the adsorbent that it passes through, and in humidification mode, it humidifies the adsorbent that it passes through. The adsorbent that the exhaust air originally passed through is regenerated and then switched to be passed through by the incoming air, which can maintain a high dehumidification or humidification capacity. The flow direction of the refrigerant can be controlled by controlling the first four-way valve to achieve the switching between dehumidification and humidification functions. The components of this solution have a high degree of integration and occupy a small space. In addition, when it is necessary to regenerate the adsorbent, it is only necessary to control the reversing device to switch the humidity regulating chamber connected to the first and second heat exchange chambers, without simultaneously switching the refrigerant flow direction, making the logic simpler and the execution more reliable. Attached Figure Description

[0080] Figure 1 This is a system schematic diagram of one embodiment of the air conditioning device proposed in this invention;

[0081] Figure 2 This is a schematic diagram of the refrigerant system in one embodiment of the air conditioning device proposed in this invention;

[0082] Figure 3 This is a system schematic diagram of another embodiment of the air conditioning device proposed in this invention;

[0083] Figure 4 This is a schematic diagram of the airflow direction in summer dehumidification state 1 of an embodiment of the air conditioning device proposed in this invention;

[0084] Figure 5 This is a schematic diagram of the airflow direction in summer dehumidification state 2 of an embodiment of the air conditioning device proposed in this invention;

[0085] Figure 6 This is a schematic diagram of the airflow direction in winter humidification state 1 of an embodiment of the air conditioning device proposed in this invention;

[0086] Figure 7 This is a schematic diagram of the airflow direction in winter humidification state 2 of an embodiment of the air conditioning device proposed in this invention;

[0087] Figure 8 This is a schematic diagram of the airflow direction during defrosting of the first heat exchanger in one embodiment of the air conditioning device proposed in this invention.

[0088] Figure 9 This is a schematic diagram of the airflow direction during defrosting of the outdoor heat exchanger in one embodiment of the air conditioning device proposed in this invention.

[0089] Figure 10 This is a schematic diagram of the airflow direction in a non-cooling and dehumidification operation mode of an air conditioning device proposed in this invention.

[0090] Figure 11 This is a schematic diagram of the airflow direction in the deep cooling operation mode of an embodiment of the air conditioning device proposed in this invention. Detailed Implementation

[0091] To make the objectives and implementation methods of this application clearer, the exemplary implementation methods of this application will be clearly and completely described below with reference to the accompanying drawings of the exemplary embodiments of this application. Obviously, the exemplary embodiments described are only some embodiments of this application, and not all embodiments.

[0092] It should be noted that the brief descriptions of terms in this application are only for the convenience of understanding the embodiments described below, and are not intended to limit the embodiments of this application. Unless otherwise stated, these terms should be understood in their ordinary and common meaning.

[0093] In the description of this invention, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0094] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances. In the description of the above embodiments, specific features, structures, materials, or characteristics can be combined in any suitable manner in one or more embodiments or examples.

[0095] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0096] Example 1

[0097] This embodiment proposes an air conditioning device, such as... Figure 1 , Figure 2 As shown, it includes an outer casing 10, a first heat exchanger 11, a second heat exchanger 12, a first adsorption element 13, a second adsorption element 14, a first reversing device 15, a second reversing device 16, a compressor 17, and a control module (not shown in the figure).

[0098] The outer casing 10 has an outdoor air inlet OA, an outdoor air outlet EA, an indoor air supply outlet SA, and an indoor return air outlet RA. The outer casing 10 has a first heat exchange chamber 18, a second heat exchange chamber 19, a first humidity control chamber 21, and a second humidity control chamber 22.

[0099] In some embodiments, a first heat exchanger 11 is disposed in a first heat exchange chamber 18, a second heat exchanger 12 is disposed in a second heat exchange chamber 19, a first adsorbent 13 is disposed in a first humidity regulating chamber 21, and a second adsorbent 14 is disposed in a second humidity regulating chamber 22.

[0100] In some embodiments, the first reversing device 15 is connected to the first heat exchange chamber 18, the second heat exchange chamber 19, the first humidity regulating chamber 21, and the second humidity regulating chamber 22 respectively, and is used to control the communication state between the two humidity regulating chambers and the two heat exchange chambers respectively.

[0101] In some embodiments, the second reversing device 16 is connected to the outdoor exhaust vent EA, the indoor air supply vent SA, the first humidity regulating cavity 21, and the second humidity regulating cavity 22 respectively, and is used to control the connection status of the outdoor exhaust vent EA and the indoor air supply vent SA with the two humidity regulating cavities respectively.

[0102] The compressor 17 is connected to the first heat exchanger 11 and the second heat exchanger 12 respectively through the first four-way valve 32. The control module is used to control the connection status of each reversing device and / or the refrigerant flow direction of the refrigerant circulation path.

[0103] Specifically, the control module controls the connection ports of the first reversing device 15 and the second reversing device 16 respectively, for connecting the second heat exchange chamber 19 to the indoor air supply vent through one of the humidity regulating chambers, and simultaneously connecting the first heat exchange chamber 18 to the outdoor exhaust vent through another humidity regulating chamber. Since the outdoor air inlet is connected to the second heat exchange chamber 19, and the indoor return air vent is connected to the first heat exchange chamber 18, the outdoor air inlet, the second heat exchange chamber 19, one of the humidity regulating chambers, and the indoor air supply vent are connected to form an air intake channel, through which fresh outdoor air can enter the room. Simultaneously, the indoor return air vent, the first heat exchange chamber 18, the other humidity regulating chamber, and the outdoor exhaust vent are connected to form an exhaust airflow channel, through which stale indoor air can be discharged to the outside.

[0104] The humidity regulating chambers through which the air inlet and exhaust airflow channels pass can be controlled by the first reversing device 15 and the second reversing device 16. The first adsorbent 13 and the second adsorbent 14 have a certain water absorption capacity and can lock in the adsorbed water. They can also release the locked water as water vapor at high temperature.

[0105] The compressor 17 controls the refrigerant flow direction by controlling the first four-way valve 32 according to the air conditioning mode. The air conditioning mode includes at least a dehumidification mode and a humidification mode. In dehumidification mode, the second heat exchanger 12 located in the second heat exchange chamber 19 acts as an evaporator. When outdoor fresh air passes through the second heat exchanger 12, it absorbs heat from the refrigerant in the second heat exchanger 12, reducing its humidity. Then, it passes through one of the adsorbents, where the adsorbent further adsorbs the moisture in the air. The dehumidified air is then delivered to the room through the indoor air outlet. At the same time, the first heat exchanger 11 located in the first heat exchange chamber 18 acts as a condenser. When indoor return air passes through the first heat exchanger 11, it is heated by the refrigerant in the first heat exchanger 11, increasing its temperature. Then, it passes through another adsorbent, where the moisture in the adsorbent is dried out, thus regenerating the adsorbent. When the adsorbent in the air inlet channel is saturated, the first reversing device 15 and the second reversing device 16 are controlled to switch the adsorbents passed through the air inlet and exhaust channels, respectively, thus achieving continuous dehumidification capability.

[0106] In humidification mode, the second heat exchanger 12 in the second heat exchange chamber 19 acts as a condenser. Outdoor fresh air is heated by the refrigerant in the second heat exchanger 12 as it passes through, increasing its temperature. It then passes through one of the adsorbents, drying out the moisture and increasing humidity. The air is then transported indoors through the indoor air outlet. Simultaneously, the first heat exchanger 11 in the first heat exchange chamber 18 acts as an evaporator. Indoor return air is heated by the refrigerant in the first heat exchanger 11 as it passes through, causing water vapor in the air to condense. This condensation then passes through another adsorbent, where moisture is absorbed. When the adsorbent in the air inlet duct is dried, the adsorbents passing through the air inlet and exhaust ducts are interchanged by controlling the first reversing device 15 and the second reversing device 16, thus achieving continuous humidification.

[0107] In some embodiments, such as Figure 1 As shown, the air conditioning unit also includes a heat recovery core 20, which is disposed between the outdoor air inlet OA and the indoor return air inlet RA and the heat exchange chamber, for heat exchange of the airflow before entering the heat exchange chamber.

[0108] Before humidification or dehumidification, both incoming fresh air and outgoing stale air undergo heat exchange through the heat recovery core 20. Specifically, when the air conditioning mode is dehumidification, the exhaust air temperature is lower than the inlet air temperature, and the inlet air absorbs the cold air from the exhaust air within the heat recovery core 20 before entering the second heat exchange chamber 19. When the air conditioning mode is humidification, the exhaust air temperature is higher than the inlet air temperature, and the inlet air absorbs the heat from the exhaust air within the heat recovery core 20 before entering the second heat exchange chamber 19. This improves heat exchange efficiency and the efficiency with which the exhaust air regenerates the adsorbent.

[0109] This solution increases the unit's operating temperature range by adding heat recovery functionality; avoids frequent switching of the dehumidifying refrigerant flow direction in summer by adjusting the position of the reversing device and heat exchanger; and achieves multiple operating modes such as dehumidification without cooling, deep dehumidification, and defrosting in winter through a three-pipe refrigerant system design. The logic is simpler, the execution is more reliable, and the integration is high while occupying less space.

[0110] In some embodiments, the heat recovery core 20 includes:

[0111] The first heat exchange channel 201 is connected to the indoor return air vent and the first heat exchange chamber 18 at its two ends, respectively.

[0112] The second heat exchange channel 202 is connected at both ends to the outdoor air inlet and the second heat exchange chamber 19, respectively.

[0113] In some embodiments, the D port of the first four-way valve 32 is connected to the discharge port 171 of the compressor, the S port of the first four-way valve 32 is connected to the suction port 172 of the compressor, the C port of the first four-way valve 32 is connected to the first port of the first heat exchanger 11 through the first solenoid valve 23, the E port of the first four-way valve 32 is connected to the second port of the second heat exchanger 12, and the second port of the first heat exchanger 11 is connected to the first port of the second heat exchanger 12 through the first electronic expansion valve 26.

[0114] In some embodiments, such as Figure 2 As shown, the control module is configured to control the refrigerant flow direction in the refrigerant circulation path according to the air conditioning mode, and to control the connection status between the various ports of the first four-way valve 32 according to the air conditioning mode. The air conditioning modes include dehumidification mode and humidification mode.

[0115] When the adjustment mode is set to dehumidification mode, such as Figure 4 As shown, the control module is configured as follows:

[0116] Start the compressor 17, control the first four-way valve 32 to connect the D port of the first four-way valve 32 with its C port, and connect the E port of the first four-way valve 32 with its S port. Adjust the opening of the first electronic expansion valve 26 so that the first heat exchanger 11 acts as a condenser and the second heat exchanger 12 acts as an evaporator.

[0117] In this mode, the refrigerant flow is as follows: compressor discharge port 171 → D port of the first four-way valve 32 → C port of the first four-way valve 32 → first heat exchanger 11 (condenser) → first electronic expansion valve 26 → second heat exchanger 12 (evaporator) → E port of the first four-way valve 32 → S port of the first four-way valve 32 → compressor suction port 172. When the intake air passes through the second heat exchanger 12, it exchanges heat with the second heat exchanger 12, resulting in a decrease in temperature and humidity, achieving a preliminary dehumidification effect.

[0118] When the adjustment mode is set to humidification mode, such as Figure 7 As shown, the control module is configured as follows:

[0119] Start the compressor 17, control the first four-way valve 32 to connect the D port of the first four-way valve 32 with its E port, and connect the C port of the first four-way valve 32 with its S port. Adjust the opening of the first electronic expansion valve 26 so that the first heat exchanger 11 acts as an evaporator and the second heat exchanger 12 acts as a condenser.

[0120] In this mode, the refrigerant flow is as follows: compressor discharge port 171 → D port of the first four-way valve 32 → E port of the first four-way valve 32 → second heat exchanger 12 (condenser) → first electronic expansion valve 26 → first heat exchanger 11 (evaporator) → C port of the first four-way valve 32 → S port of the first four-way valve 32 → compressor suction port 172. When the intake air passes through the second heat exchanger 12, it exchanges heat with the second heat exchanger 12, and its temperature rises.

[0121] In some embodiments, such as Figure 3 As shown, the air conditioning unit also includes an outdoor heat exchanger 24. The first port of the outdoor heat exchanger 24 is connected to the C port of the first four-way valve 32, and the second port of the outdoor heat exchanger 24 is connected between the second port of the first heat exchanger 11 and the first electronic expansion valve 26 via a second solenoid valve 25. By setting the outdoor heat exchanger 24, the cooling capacity during dehumidification and the heating capacity during humidification can be further improved.

[0122] Including the outdoor heat exchanger 24 hours, the control module also includes a configuration as follows:

[0123] Obtain the supply air temperature Tsa and supply air humidity dsa at the indoor air outlet;

[0124] Obtain the target temperature Tset indoor and the target moisture content dset indoor;

[0125] The temperature and humidity judgment steps determine whether the temperature limit (Tsa) and humidity limit (dsa) are met.

[0126] If the conditions are not met, the compressor 17 is controlled to increase its frequency and it is determined whether the compressor 17 frequency has reached the upper limit. If the compressor 17 frequency reaches the upper limit but the judgment condition is still not met, the second solenoid valve 25 is opened and the outdoor fan is controlled to open at a volume less than the rated air volume.

[0127] Return to the temperature and humidity judgment step. If the judgment conditions are met, maintain the current state until the supply air temperature Tsa and supply air humidity dsa reach the set values, and then control the compressor 17 to reduce the frequency. If the judgment conditions are not met, increase the speed of the outdoor fan to start at the rated air volume.

[0128] Return to the temperature and humidity judgment steps again. If the judgment conditions still cannot be met, reduce the air intake.

[0129] The system also includes a step to determine the difference between the indoor temperature Tindoor and the target temperature Tset indoor, which is the ideal temperature set by the user. The smaller the difference between Tindoor and Tset indoor, the closer Tindoor is to Tset indoor. It also includes a step to determine the difference between the indoor humidity dindoor and the target humidity dset indoor. The smaller the difference between dindoor and dset indoor, the closer dindoor is to dset indoor. When both Tindoor and dindoor meet the set conditions and remain so for a certain period, the second solenoid valve 25 can be closed, meaning the refrigerant no longer passes through the outdoor heat exchanger 24.

[0130] In some embodiments, for example, if Tindoor≤Tsetindoor-3 and the moisture content dindoor≤dsetindoor-2.5, and the condition is met for a continuous time of 1 hour or more, then the second solenoid valve 25 closes and the outdoor fan stops.

[0131] During winter dehumidification, the first heat exchanger 11 and the outdoor heat exchanger 24 act as evaporators, and their outer surfaces are prone to frost buildup. In some cases, defrosting is necessary to prevent a reduction in heat exchange efficiency. In some embodiments, the air conditioning device further includes a second first four-way valve 326 and a second electronic expansion valve 27. The D port of the second first four-way valve 326 is connected to the first port of the outdoor heat exchanger 24, the E port of the second four-way valve 33 is connected to the C port of the first four-way valve 32, the C port of the second four-way valve 33 is connected to the E port of the first four-way valve 32, and the S port of the second four-way valve 33 is blocked. The second electronic expansion valve 27 is connected between the outdoor heat exchanger 24 and the second solenoid valve 25.

[0132] In the aforementioned ordinary dehumidification or humidification mode, when it is necessary to control the opening of the second solenoid valve 25, it also includes controlling the full opening of the second electronic expansion valve 27 and controlling the D port of the second four-way valve 33 to connect with its E port.

[0133] Air conditioning modes also include a defrost mode, such as Figure 8 As shown, the defrosting modes include the first heat exchanger 11 defrosting mode and the outdoor heat exchanger 24 defrosting mode, which are used to defrost the first heat exchanger 11 and the outdoor heat exchanger 24, respectively.

[0134] In the defrost mode of the first heat exchanger 11, the control module is configured as follows:

[0135] Close the first electronic expansion valve 26;

[0136] Start the compressor 17, control the first four-way valve 32 to connect its D port to its C port and its E port to its S port, control the second four-way valve 33 to connect its D port to its C port, and adjust the opening of the second electronic expansion valve 27 so that the first heat exchanger 11 acts as a condenser and the outdoor heat exchanger 24 acts as an evaporator.

[0137] In this mode, the refrigerant flow is as follows: compressor discharge port 171 → D port of the first four-way valve 32 → C port of the first four-way valve 32 → first heat exchanger 11 (condenser) → second solenoid valve 25 → second electronic expansion valve 27 → outdoor heat exchanger 24 (evaporator) → D port of the second four-way valve 33 → C port of the second four-way valve 33 → E port of the first four-way valve 32 → S port of the first four-way valve 32 → compressor suction port 172. The first heat exchanger 11 acts as a condenser, and the high-temperature refrigerant inside is used to defrost the first heat exchanger 11.

[0138] In the outdoor heat exchanger's 24-hour defrost mode, the control module is configured as follows:

[0139] Close the first electronic expansion valve 26;

[0140] Start the compressor 17, control the first four-way valve 32 to connect its D port to its E port and its C port to its S port, control the second four-way valve 33 to connect its D port to its C port, and adjust the opening of the second electronic expansion valve 27 so that the first heat exchanger 11 acts as an evaporator and the outdoor heat exchanger 24 acts as a condenser.

[0141] In this mode, the refrigerant flow direction is as follows: compressor discharge port 171 → D port of the first four-way valve 32 → E port of the first four-way valve 32 → C port of the second four-way valve 33 → D port of the second four-way valve 33 → outdoor heat exchanger 24 (condenser) → second electronic expansion valve 27 → first heat exchanger 11 (evaporator) → C port of the first four-way valve 32 → S port of the first four-way valve 32 → compressor suction port 172.

[0142] In some areas, the relative humidity of outdoor fresh air is very high, and the temperature ranges from 10 to 22°C. In such cases, dehumidification and heating are necessary to achieve better airflow comfort. Although the relative humidity of the outdoor fresh air is extremely high at this time, the moisture content is only around 15 g / kgDA, meaning the dehumidification capacity is not at its peak throughout the year. Since this device lacks auxiliary electric heating and does not have a condenser at the air outlet, increasing the airflow temperature relies on the heat released by the adsorption material. As the material properties indicate, the more moisture the adsorption material absorbs, the more heat it releases. Therefore, it is essential to maximize the dehumidification capacity of the adsorption material.

[0143] Therefore, in this situation, to ensure that the evaporator does not dehumidify, we must rely solely on the adsorption material to dehumidify. The greater the amount of dehumidification, the more heat is released, and the more significant the increase in the supply air temperature.

[0144] In some embodiments, the air conditioning mode also includes a non-cooling and dehumidification mode;

[0145] The control module is configured as follows in non-cooling and dehumidification mode:

[0146] Close the second electronic expansion valve 27 and open the first solenoid valve 23;

[0147] Obtain the dew point temperature TL13 at the inlet liquid pipe of the second heat exchanger 12;

[0148] Get the temperature at the inlet liquid pipe of the second heat exchanger 12, which is the evaporation temperature Te, and determine whether the difference between the evaporation temperature Te and the dew point temperature TL13 meets the set range.

[0149] When the difference between Te and TL13 does not meet the set range, the compressor 17 is controlled to reduce its frequency. If the frequency of compressor 17 has reached the lower limit and the difference between Te and TL13 still does not meet the set range, the exhaust fan is controlled to reduce its speed until the difference between Te and TL13 meets the set range.

[0150] Determine whether the supply air temperature Tsa meets the set range. If it does, maintain the current state until the difference between the supply air temperature Tsa and the target temperature Tset indoor is within the set error range, and then control the compressor 17 to reduce the frequency. If the supply air temperature Tsa does not meet the set range, control the blower to reduce the speed.

[0151] Determine whether the supply air moisture content (dsa) meets the set range. If it does, maintain the current state; if the supply air moisture content (dsa) does not meet the set range, control the compressor 17 to increase its frequency.

[0152] In some embodiments, the condition for entering the non-cooling dehumidification mode is: obtaining the relative humidity and air temperature of the air entering through the outdoor air inlet, determining whether the relative humidity and air temperature of the air entering meet the set values, and if so, entering the non-cooling dehumidification control mode.

[0153] In some embodiments, obtaining the dew point temperature TL13 at the inlet liquid pipe of the second heat exchanger 12 includes: obtaining the inlet air temperature Toa and the inlet air moisture content doa, and then calculating the temperature and moisture content of the airflow after the inlet air passes through the heat recovery core 20 based on the enthalpy efficiency and temperature efficiency of the heat recovery core 20, which are respectively the first temperature T13 and the first moisture content d13, and calculating the corresponding dew point temperature TL13 based on T13 and d13.

[0154] Some special locations require lower supply air temperature and humidity, such as Tsa≤16℃, dsa≤6g / kg DA, where the dew point temperature TL=6.5℃. Therefore, a larger cooling and dehumidification capacity is required. Thus, both the outdoor heat exchanger 24 and the first heat exchanger 11 need to be condensers.

[0155] In some embodiments, the air conditioning mode also includes a deep dehumidification mode;

[0156] The control module is configured as follows in deep dehumidification mode:

[0157] Open the first solenoid valve 23;

[0158] The first four-way valve 32 is connected to its C port by controlling the D port to be connected to its E port by controlling the second four-way valve 33.

[0159] Obtain the dew point temperature TL13 at the inlet liquid pipe of the second heat exchanger 12;

[0160] Get the temperature at the inlet liquid pipe of the second heat exchanger 12, which is the evaporation temperature Te, and determine whether the difference between the evaporation temperature Te and the dew point temperature TL13 meets the set range.

[0161] When the difference between Te and TL13 meets the set range, the state of the compressor 17 and the first electronic expansion valve 26 remains unchanged; if it does not meet the set range, the compressor 17 is controlled to increase its frequency while the opening of the first electronic expansion valve 26 is adjusted until the difference between Te and TL13 meets the set range.

[0162] Determine whether the supply air temperature Tsa and supply air moisture content dsa meet the set range respectively. If they do, control the state of compressor 17 and first electronic expansion valve 26 to remain unchanged. If they do not meet the set range, return to the step of determining whether the difference between evaporation temperature Te and dew point temperature TL13 meets the set range.

[0163] In some embodiments, the criteria for entering the deep dehumidification mode are:

[0164] Get the inlet air temperature Toa and inlet air humidity doa, and determine whether the inlet air temperature Toa and inlet air humidity doa have reached the set range respectively. If so, determine whether the set supply air temperature Tsa, set and the set supply air humidity doa are not greater than their respective set limits. If the set supply air temperature Tsa, set and the set supply air humidity doa are not greater than their respective set limits, then enter the deep dehumidification mode.

[0165] In some embodiments, the method for obtaining the dew point temperature TL13 at the inlet liquid pipe of the second heat exchanger 12 is as follows: obtain the inlet air temperature Toa and the inlet air moisture content doa, and then calculate the temperature and moisture content of the inlet air after passing through the core, i.e. the temperature and moisture content before the second heat exchanger 12, based on the enthalpy efficiency and temperature efficiency of the total heat core, and record them as T13 and d13, and calculate the corresponding dew point temperature TL13 based on T13 and d13.

[0166] In some embodiments, the control module further includes a configuration for controlling the operation of the first reversing device 15 and the second reversing device 16 to connect the indoor air outlet to the second heat exchange chamber 19 through one of the first humidity regulating chamber 21 and the second humidity regulating chamber 22, and to connect the outdoor air outlet to the first heat exchange chamber 18 through the other of the first humidity regulating chamber 21 and the second humidity regulating chamber 22.

[0167] In some embodiments, as shown in the figure, the indoor air supply outlet is connected to the second heat exchange chamber 19 through the second humidity regulating chamber 22, and the outdoor air exhaust outlet is connected to the first heat exchange chamber 18 through the first humidity regulating chamber 21. The two sealed passages are indicated by the arrows in the figure.

[0168] In some embodiments, as shown in the figure, which is a schematic diagram of the humidity regulating chamber after reversal, the indoor air supply outlet is connected to the second heat exchange chamber 19 through the first humidity regulating chamber 21, and the outdoor air exhaust outlet is connected to the first heat exchange chamber 18 through the second humidity regulating chamber 22. The two sealed paths are indicated by the arrows in the figure.

[0169] In some embodiments, the control module further includes a humidity regulating chamber configured to switch the first reversing device 15 and the second reversing device 16 according to the humidity content of the air supplied from the indoor air outlet, thereby exchanging the humidity regulating chambers that connect the indoor air outlet and the outdoor air outlet respectively.

[0170] The control method for commutating the first commutator 15 and the second commutator 16 includes:

[0171] Calculate the rate of change of the moisture content of the supply air. When the rate of change of the moisture content of the supply air is not greater than the first set value, and the difference between the moisture content of the supply air and the maximum moisture content in this reversing cycle is not greater than the second set value, it indicates that the adsorption capacity of the adsorption material is decreasing and is about to approach saturation. It is necessary to control the first reversing device 15 and the second reversing device 16 to switch directions.

[0172] Before controlling the first reversing device 15 and the second reversing device 16 to reverse, the method also includes controlling the blower and exhaust fan to reduce their speed.

[0173] After controlling the first reversing device 15 and the second reversing device 16 to switch directions, the system also includes controlling the supply fan and exhaust fan to increase their speed, so that the air volume can be increased to the rated air volume or the current set air volume within a set time.

[0174] Example 2

[0175] The following presents some specific application examples of an air conditioning device.

[0176] 1.1 Summer dehumidification

[0177] State 1:

[0178] like Figure 4 As shown, the compressor 17 is turned on, and the first four-way valve 32 is controlled to operate, connecting the D port of the first four-way valve 32 to its C port and the E port of the first four-way valve 32 to its S port. The opening of the first electronic expansion valve 26 is adjusted so that the first heat exchanger 11 acts as a condenser and the second heat exchanger 12 acts as an evaporator.

[0179] Air intake airflow channel: Outdoor fresh air enters the unit from OA, first passes through the first filter 28 for purification, and then reaches the heat recovery core 20 to exchange heat with the exhaust air (indoor air), resulting in a decrease in temperature and humidity. Then it reaches the second heat exchanger 12, which acts as an evaporator, controlling the evaporation temperature to be lower than the air dew point temperature. Therefore, after the incoming air passes through the second heat exchanger 12, the temperature decreases, the absolute humidity decreases, and the relative humidity increases. Then the fresh air reaches the first reversing device 15, which connects the second heat exchange chamber 19 and the second humidity regulating chamber 22. Thus, the incoming air passes through the second adsorption element 14 for dehumidification. At this time, the fresh air, which is low in temperature and high in humidity, is adsorbed by the water vapor it carries when passing through the second adsorption element 14. After passing through the adsorption material, the absolute humidity of the fresh air is further reduced. Then the incoming air passes through the second reversing device 16 to the blower 30, and finally is sent into the room through the air outlet. During this process, the second adsorption element 14 adsorbs water vapor and becomes humid.

[0180] Exhaust airflow channel: Exhaust air (indoor air) enters the unit from RA, first passes through the second filter 29 for purification, and then reaches the heat recovery core 20 to exchange heat with the exhaust air (indoor air), increasing humidity; then it enters the first heat exchange chamber 18 and reaches the first heat exchanger 11, where the first heat exchanger 11 acts as a condenser, and the exhaust air exchanges heat with the condenser, carrying away the heat from the condenser, increasing the exhaust air temperature and decreasing the relative humidity; then the exhaust air reaches the first reversing device 15, which connects the first heat exchange chamber 18 with the first humidity regulating chamber 21, so the air inlet passes through the first adsorption element 13. At this time, the high temperature and low humidity exhaust air passes through the first adsorption element 13, drying out the moisture inside the material. This moisture is absorbed into the exhaust air in the form of water vapor, and then the exhaust air reaches the second reversing device 16, and finally passes through the exhaust fan 31 to be discharged outdoors from EA; during this process, the first adsorption element 13 is dried.

[0181] The first commutator 15 and the second commutator 16 control the commutation:

[0182] When the first adsorption element 13 is detected to be saturated, the unit issues a reversing command, and both the first reversing device 15 and the second reversing device 16 are activated, entering state 2.

[0183] State 2:

[0184] like Figure 5 As shown, the air intake airflow channel is as follows: Outdoor fresh air enters the unit from OA, first passes through the first filter 28 for purification, and then reaches the heat recovery core 20 to exchange heat with the exhaust air (indoor air), resulting in a decrease in temperature and humidity. It then reaches the second heat exchanger 12, which acts as an evaporator, controlling the evaporation temperature to be lower than the air dew point temperature. Therefore, after passing through the second heat exchanger 12, the temperature and absolute humidity of the incoming air decrease, while the relative humidity remains high. The fresh air then reaches the first reversing device 15, which connects the second heat exchange chamber 19 to the first humidity regulating chamber 21. The incoming air then passes through the first adsorption element 13 for dehumidification. At this time, the low temperature and high humidity of the fresh air passing through the first adsorption element 13 cause the water vapor it carries to be adsorbed inside the material. This further reduces the absolute humidity of the fresh air after passing through the adsorption material. The incoming air then passes through the second reversing device 16 to the blower 30, and finally enters the room through the air outlet 30. During this process, the second adsorption element 14 adsorbs water vapor and becomes humid.

[0185] Exhaust airflow channel: Exhaust air (indoor air) enters the unit from RA, first passes through the second filter 29 for purification, and then reaches the heat recovery core 20 to exchange heat with the exhaust air (indoor air), increasing humidity; then it enters the first heat exchange chamber 18 and reaches the first heat exchanger 11, where the first heat exchanger 11 acts as a condenser, and the exhaust air exchanges heat with the condenser, carrying away the heat from the condenser, increasing the exhaust air temperature and decreasing the relative humidity; then the exhaust air reaches the first reversing device 15, which connects the first heat exchange chamber 18 to the second humidity regulating chamber 22, so the air inlet passes through the second adsorption element 14. At this time, the high temperature and low humidity exhaust air passes through the second adsorption element 14, drying out the moisture inside the material. This moisture is absorbed into the exhaust air in the form of water vapor, and then the exhaust air reaches the second reversing device 16, and finally passes through the exhaust fan 31 to be discharged outdoors from EA; during this process, the second adsorption element 14 is dried.

[0186] Refrigerant circulation in dehumidification mode:

[0187] The high-temperature, high-pressure gaseous refrigerant from compressor 17 first reaches the first four-way valve 32, then splits into two parts. One part passes through the first solenoid valve 23 to the first heat exchanger 11, where it exchanges heat with the exhaust air, transforming the refrigerant into a low-temperature, high-pressure gas-liquid two-phase refrigerant, which then flows to the first electronic expansion valve 26. The other part flows to the outdoor heat exchanger 24, where it exchanges heat with the outdoor air, transforming into a low-temperature, high-pressure gas-liquid two-phase refrigerant, which then flows through the second solenoid valve 25 and then to the first electronic expansion valve 26. Before the first electronic expansion valve 26, the two parts of refrigerant merge and pass through the first electronic expansion valve 26 for throttling and pressure reduction, becoming a low-temperature, low-pressure liquid refrigerant, which then flows to the second heat exchanger 12, where it exchanges heat with the fresh air outside the pipe, transforming into a low-temperature, high-pressure gaseous refrigerant, which then returns to the first four-way valve 32 and finally back to the compressor's suction port 172, completing one refrigeration cycle.

[0188] Reversing control:

[0189] Step 1: Determine the rate of change of moisture content in the supply air. SA has a temperature and humidity sensor that detects moisture content every 30 seconds. First, determine whether the following conditions are met: dsa-dsa-i≥0 and dsa-dmin≥δ. dsa is the moisture content detection value at the current moment; dsa-i is the moisture content detection value at the previous moment; dmin is the minimum moisture content within the current reversal cycle; δ can be customized.

[0190] If this condition is met, it indicates that the adsorption capacity of the adsorbent material is decreasing and is about to reach saturation.

[0191] Step 2: Both the supply fan and the exhaust fan reduce their speed, reducing to 50% of the rated air volume (or 50% of the currently set air volume) within 10 seconds.

[0192] Step 3: The air outlets of the first reversing device 15 and the second reversing device 16 are reversed.

[0193] Step 4: Increase the speed of the supply fan and exhaust fan, increasing them to the rated air volume (or 50% of the current set air volume) within 10 seconds.

[0194] Refrigeration system control:

[0195] Step 1: Power on, the first solenoid valve 23 opens, the second solenoid valve 25 closes, and the compressor 17 starts;

[0196] Step 2: Detection. Based on the temperature and humidity sensor at the air outlet, detect the air supply temperature Tsa and the air supply humidity dsa.

[0197] Based on the temperature and humidity sensors on the indoor wired controller, the set target temperature Tset indoor and dsetindoor are detected. If no target is set, the default values ​​are Tset′=27℃, relative humidity RH=60%, and dset′=13.4.

[0198] Step 3: Compare the supply air parameters with the set parameters to determine if the following conditions are met: Tsa≤Tset indoor-ε and moisture content dsa≤dset indoor-μ, where ε and μ can be customized.

[0199] Step 4: If not satisfied, compressor 17 will increase its frequency and ensure EER ≥ 3.0. If compressor 17 has reached its upper limit and still cannot meet the above conditions, proceed to step 5.

[0200] Step 5: The second solenoid valve 25 is opened, the outdoor fan starts at 50% of the rated air volume, and the opening of the first electronic expansion valve 26 is adjusted to the appropriate number of steps.

[0201] Step 6: Return again to determine whether Tsa≤Tsetindoor-ε and moisture content dsa≤dsetindoor-μ;

[0202] If the conditions are met, the current state is maintained until Tsa-Tset indoor ≤ -2℃ and dsa-dset indoor ≤ -1g / kg DA, at which point compressor 17 reduces its frequency to achieve energy saving. If the conditions are not met, the outdoor fan increases its speed and starts at 100% of its rated air volume. Then, the process returns to check if Tsa ≤ Tset indoor - ε and moisture content dsa ≤ dset indoor - μ. If the conditions are still not met, the fresh air volume is reduced by 10% each time until the air supply requirements are met.

[0203] Step 7: If Tindoor≤Tsetindoor-3 and the moisture content dindoor≤dsetindoor-2.5, and this condition is met for a duration of 1 hour or more, then the second solenoid valve 25 will close and the outdoor fan will stop.

[0204] 1.2 Winter Heating and Humidification Operation

[0205] Considering that the evaporator may frost up in winter, a second electronic expansion valve 27 and a second four-way valve 33 are added.

[0206] State 1:

[0207] like Figure 6 As shown, the compressor 17 is turned on, and the first four-way valve 32 is controlled to operate, connecting the D port of the first four-way valve 32 to its E port and the C port of the first four-way valve 32 to its S port. The opening of the first electronic expansion valve 26 is adjusted so that the first heat exchanger 11 acts as an evaporator and the second heat exchanger 12 acts as a condenser.

[0208] Airflow duct: Outdoor fresh air enters the unit from the OA, first passes through the first filter 28 for purification, and then reaches the heat recovery core 20 to exchange heat with the exhaust air (indoor air), increasing the temperature and humidity. It then reaches the second heat exchanger 12, where it acts as a condenser. The fresh air exchanges heat with the second heat exchanger 12, removing its heat, causing the inlet air temperature to rise again and the relative humidity to decrease. The fresh air then reaches the first reversing device 15, which connects the second heat exchange chamber 19 and the second humidity regulating chamber 22. The inlet air then passes through the second adsorbent 14. At this point, the high temperature and low humidity of the fresh air passing through the second adsorbent 14 dries out the moisture inside the material, which is then absorbed into the fresh air as water vapor. The fresh air then passes through the second reversing device 16 to the blower, and finally through the air outlet into the room. During this process, the second adsorbent 14 loses moisture and becomes dry.

[0209] Exhaust airflow channel: Exhaust air (indoor air) enters the unit from RA, first passes through the second filter on the return air side for purification, and then enters the heat recovery core 20 to exchange heat with the incoming air. After heat exchange, the exhaust air temperature and humidity decrease. Then it reaches the first heat exchanger 11, which acts as an evaporator. The evaporation temperature is controlled to be higher than the air dew point temperature. Therefore, after the exhaust air passes through the first heat exchanger 11, the temperature decreases, the absolute humidity remains unchanged, and the relative humidity increases. Then the exhaust air reaches the first reversing device 15, which connects the first heat exchange chamber 18 and the first humidity regulating chamber 21. In this way, the fresh air reaches the first adsorption element 13. When the low-temperature and high-humidity exhaust air passes through the first adsorption element 13, the water vapor it carries is adsorbed inside the material. Thus, the absolute humidity of the exhaust air is reduced after passing through the first adsorption element 13. Then the exhaust air goes to the second reversing device 16 and finally is discharged to the outside through the exhaust vent. During this process, the first adsorption element 13 adsorbs the moisture in the exhaust air and becomes humid.

[0210] The first commutator 15 and the second commutator 16 control the commutation:

[0211] When the second adsorption element 14 is detected to be about to dry, the unit issues a reversing command, and both the first reversing device 15 and the second reversing device 16 activate, entering state 2.

[0212] State 2:

[0213] like Figure 7As shown, the air intake airflow channel is as follows: Outdoor fresh air enters the unit from the OA, first passes through the first filter 28 for purification, and then reaches the heat recovery core 20 to exchange heat with the exhaust air (indoor air). The temperature and humidity increase, and then it reaches the second heat exchanger 12. At this time, the second heat exchanger 12 acts as a condenser. The fresh air exchanges heat with the second heat exchanger 12, taking away the heat from the second heat exchanger 12. The intake air temperature rises again, and the relative humidity decreases. Then the fresh air reaches the first reversing device 15. At this time, the first reversing device connects the second heat exchange chamber 19 and the first humidity regulating chamber 21. In this way, the intake air passes through the first adsorption element 13. At this time, the high temperature and low humidity fresh air passes through the first adsorption element 13 and dries the moisture inside the material. This moisture is integrated into the fresh air in the form of water vapor. Then the fresh air reaches the second reversing device 16 and reaches the blower 30. Finally, it is sent into the room through the air outlet 30. During this process, the first adsorption element 13 loses moisture and becomes dry.

[0214] Exhaust airflow channel: Exhaust air (indoor air) enters the unit from RA, first passes through the second filter for purification, and then enters the heat recovery core 20 to exchange heat with the fresh air. After heat exchange, the exhaust air temperature increases and the humidity increases. Then it reaches the first heat exchanger 11, which acts as an evaporator. The evaporation temperature is controlled to be lower than the air dew point temperature. Therefore, the temperature of the fresh air decreases after passing through the first heat exchanger 11, the absolute humidity remains unchanged, but the relative humidity is high. Then the exhaust air reaches the first reversing device 15, which connects the first heat exchange chamber 18 and the second humidity regulating chamber 22. In this way, the fresh air reaches the second adsorption element 14. When the low temperature and high humidity exhaust air passes through the second adsorption element 14, the water vapor it carries is adsorbed inside the material. After passing through the adsorption material, the absolute humidity of the fresh air is further reduced. Then the exhaust air reaches the second reversing device 16 and finally passes through the exhaust fan 31 to be discharged to the outside from EA. During this process, the second adsorption element 14 adsorbs the moisture in the exhaust air and becomes humid.

[0215] Refrigerant circulation in humidification mode:

[0216] The high-temperature, high-pressure gaseous refrigerant from compressor 17 first reaches the first four-way valve 32, then flows to the second heat exchanger 12. The second heat exchanger 12 exchanges heat with the fresh air, and the refrigerant becomes a low-temperature, high-pressure gas-liquid two-phase refrigerant. It then flows to the first electronic expansion valve 26, where it is throttled and depressurized, becoming a low-temperature, low-pressure liquid refrigerant. It then splits into two parts. One part flows to the first heat exchanger 11, where it exchanges heat with the exhaust air, absorbing the heat from the exhaust air and becoming a low-temperature, high-pressure gaseous refrigerant, which then flows to the first solenoid valve 23. The other part is split through the second solenoid valve 25 and the second electronic expansion valve 27 to the outdoor heat exchanger 24 (at which time the second electronic expansion valve 27 is fully open), where it exchanges heat with the outdoor air and becomes a low-temperature, high-pressure gaseous refrigerant. It then flows to the second four-way valve 33, where the two parts of refrigerant merge after the first solenoid valve 23, return to the first four-way valve 32, and finally return to the compressor's suction port 172, completing one heating cycle.

[0217] At this time, both the first solenoid valve 23 and the second solenoid valve 25 are open, and the outdoor heat exchanger 24 and the first heat exchanger 11 are both used as evaporators; the second heat exchanger 12 is used as a condenser.

[0218] When the first solenoid valve 23 is open and the second solenoid valve 25 is closed, only the first heat exchanger 11 functions as an evaporator.

[0219] First commutator 15 and second commutator 16 commutation control:

[0220] Step 1: Determine the rate of change of moisture content in the supply air. SA has a temperature and humidity sensor that detects moisture every 30 seconds. First, determine whether the following conditions are met: dsa-dsa-i≤0 and dsa-dmax≤-δ. dsa is the moisture content detected at the current moment; dsa-i is the moisture content detected at the previous moment; dmax is the maximum moisture content within the current reversal cycle; and δ can be customized.

[0221] If this condition is met, it indicates that the adsorption capacity of the adsorbent material is decreasing and is about to reach saturation.

[0222] Step 2: Both the supply fan and the exhaust fan will slow down, reducing to 50% of the rated air volume (or 50% of the currently set air volume) within 10 seconds.

[0223] Step 3: The air outlets of the first reversing device 15 and the second reversing device 16 are reversed;

[0224] Step 4: Increase the speed of the supply fan and exhaust fan, increasing them to the rated air volume (or 50% of the current set air volume) within 10 seconds.

[0225] Heating control:

[0226] Step 1: Power on, the first solenoid valve 23 opens, the second solenoid valve 25 closes, and the compressor 17 starts;

[0227] Step 2: Detection. Based on the temperature and humidity sensor at the air outlet, detect the air supply temperature Tsa and the air supply humidity dsa.

[0228] Based on the temperature and humidity sensors on the indoor wired controller, the set target temperatures Tset indoor and dsetindoor are detected. If no target is set, the default values ​​are Tset′=20℃ and dset′=4.5℃.

[0229] Step 3: Compare the supply air parameters with the set parameters to determine if the following conditions are met: Tsa≥Tset indoor+λ and moisture content dsa≥dset indoor, where λ can be customized;

[0230] Step 4: If the conditions are not met, the compressor 17 will increase its frequency and ensure that the COP is ≥ 3.5. If the frequency of the compressor 17 has reached the upper limit, the above conditions still cannot be met.

[0231] Step 5: The second solenoid valve 25 is opened, the outdoor fan starts at 50% of the rated air volume, and the opening of the first electronic expansion valve 26 is adjusted to the appropriate number of steps.

[0232] Step 6: Return again to determine if Tsa ≥ Tsetindoor + λ and the moisture content dsa ≥ dset indoor.

[0233] If the conditions are met, the current state is maintained until Tsa-Tset indoor ≥ 2℃ and dsa-dset indoor ≥ 1g / kgDA. Then, compressor 17 will reduce its frequency to achieve energy saving.

[0234] If the conditions are not met, the outdoor fan speed is increased to operate at 100% of the rated air volume; then the process is repeated to determine if Tsa≥Tsetindoor+λ and the moisture content dsa≥dsetindoor; if the conditions are still not met, the fresh air volume is reduced by 10% each time until the air supply requirements are met.

[0235] Step 7: If Tindoor > Tset indoor + 2 and the moisture content dindoor ≥ dset indoor, and this condition is met for a continuous time of 1 hour or more, then the second solenoid valve 25 will close and the outdoor fan will stop.

[0236] 1.3 Winter defrosting operation and control methods

[0237] Defrosting 1: Defrosting of the first heat exchanger 11.

[0238] like Figure 8As shown, the first electronic expansion valve 26 is closed at this time. In order to prevent the indoor air supply from feeling cold, the blower is running at a low air volume. The second electronic expansion valve 27 is open, which plays a role in throttling and reducing pressure. The first four-way valve 32 and the second four-way valve 33 are both in the heating state.

[0239] The refrigerant cycle is as follows:

[0240] The high-temperature, high-pressure gaseous refrigerant from compressor 17 first reaches the first four-way valve 32, and then flows through the first solenoid valve 23 to the first heat exchanger 11. The first heat exchanger 11 exchanges heat with the exhaust air outside the pipe, and the refrigerant becomes a low-temperature, high-pressure gas-liquid two-phase refrigerant. It then flows to the second solenoid valve 25 and the second electronic expansion valve 27. After the second electronic expansion valve 27 throttles and reduces the pressure, it becomes a low-temperature, low-pressure liquid refrigerant. Then it flows to the second four-way valve 33, then back to the first four-way valve 32, and finally back to the compressor's suction port 172, completing one defrosting cycle.

[0241] Defrosting 2: Outdoor heat exchanger 24 defrosting.

[0242] like Figure 9 As shown, the first electronic expansion valve 26 is closed at this time, and the blower operates at a low airflow to prevent a cold feeling in the indoor air supply; the second electronic expansion valve 27 is open, which serves to throttle and reduce pressure; the second four-way valve 33 is in heating mode; and the first four-way valve 32 is in cooling mode.

[0243] The refrigerant cycle is as follows:

[0244] The high-temperature, high-pressure gaseous refrigerant from compressor 17 first reaches the first four-way valve 32, then flows to the second four-way valve 33, and enters the outdoor heat exchanger 24. The outdoor heat exchanger 24 exchanges heat with the air outside the pipe, and the refrigerant becomes a low-temperature, high-pressure gas-liquid two-phase refrigerant. It then flows to the second electronic expansion valve 27. After the second electronic expansion valve 27 throttles and reduces the pressure, it becomes a low-temperature, low-pressure liquid refrigerant. Then it passes through the second solenoid valve 25 and flows to the first heat exchanger 11. In the first heat exchanger 11, it absorbs the heat from the exhaust air outside the pipe and becomes a low-temperature, high-pressure gaseous refrigerant. Then it passes through the first solenoid valve 23 and the first four-way valve 32 and returns to the compressor's suction port 172, completing one defrosting cycle.

[0245] 1.4 Operation without cooling and dehumidification

[0246] like Figure 10As shown, in southern my country during February and March, the relative humidity of fresh air is very high, and the temperature ranges from 10 to 22°C. Dehumidification and heating are necessary at this time to achieve better airflow comfort. Although the relative humidity of the fresh air is extremely high at this time, the moisture content is only 15 g / kg DA, and the dehumidification capacity is not at its highest throughout the year. Since this device has no auxiliary electric heating and no condenser at the air outlet, the heat release from the adsorption material is needed to increase the airflow temperature. As we know from the material properties, the more moisture the adsorption material absorbs, the more heat it releases. Therefore, it is necessary to maximize the dehumidification capacity of the adsorption material.

[0247] Therefore, in this situation, to ensure that the evaporator does not dehumidify, we rely solely on the adsorption material to dehumidify. The greater the amount of dehumidification, the more heat is released, and the more significant the increase in supply air temperature.

[0248] At this time, the outdoor heat exchanger 24 is not working, that is, the second electronic expansion valve 27 is closed; the second solenoid valve 25 is removed.

[0249] At this point, the ventilation path is the same as in summer dehumidification, so I won't go into details.

[0250] At this time: only the first heat exchanger 11 functions as a condenser.

[0251] The refrigerant cycle is as follows:

[0252] The high-temperature, high-pressure gaseous refrigerant from compressor 17 first reaches the first four-way valve 32, then flows through the first solenoid valve 23 to the first heat exchanger 11. The first heat exchanger 11 exchanges heat with the outside air, and the refrigerant becomes a low-temperature, high-pressure gas-liquid two-phase refrigerant. It then flows to the first electronic expansion valve 26, where it is throttled and depressurized, becoming a low-temperature, low-pressure liquid refrigerant. It then flows to the second heat exchanger 12, where it absorbs heat from the outside fresh air, becoming a low-temperature, high-pressure gaseous refrigerant. It then returns to the first four-way valve 32 and finally to the compressor's suction port 172, completing one dehumidification cycle.

[0253] No cooling or dehumidification control:

[0254] Step 1: First, determine whether the outdoor fresh air meets the requirements of RH≥90% and Toa≤20℃. If it does, then enter the non-cooling dehumidification control mode.

[0255] Step 2: Power on, the first solenoid valve 23 opens, the second electronic expansion valve 27 closes, and the compressor 17 starts;

[0256] Step 3: Detection. Based on the temperature and humidity sensor at the fresh air inlet, detect the inlet air temperature Toa and inlet air moisture content doa. Then, based on the enthalpy efficiency and temperature efficiency of the total heat exchanger core, calculate the temperature and moisture content of the fresh air after passing through the core, i.e. the temperature and moisture content before the second heat exchanger 12, denoted as T13 and d13. Calculate the corresponding dew point temperature TL13 based on T13 and d13.

[0257] Step 4: Determine whether the evaporation temperature satisfies Te≥TL13+1, where Te is obtained from the temperature sensor at the inlet liquid pipe of the second heat exchanger 12;

[0258] Step 5: If the conditions are not met, compressor 17 will reduce its frequency. If the frequency of compressor 17 has reached the lower limit and the above conditions still cannot be met, the exhaust fan will reduce its speed by 10% each time until the requirements of step 3 are met.

[0259] Step 6: Then determine whether Tsa≥Tsetindoor+1 is satisfied. If satisfied, maintain the current state until Tsa-Tsetindoor≥2℃, then compressor 17 will reduce frequency to achieve energy saving. If not satisfied, the blower will reduce speed by 10% each time until the air supply requirements are met.

[0260] Step 7: Then determine whether the moisture content dsa ≤ dset indoor + 1 is satisfied. If satisfied, maintain the current state; if not satisfied, the compressor frequency will increase to 17.

[0261] This ensures that the air supply parameter Tsa is always greater than or equal to the set target + 1℃ (Tset indoor + 1), while the moisture content is always less than or equal to the set target + 1g / kg DA.

[0262] 1.5 Deep Cooling Mode

[0263] The refrigerant cycle is as follows:

[0264] like Figure 11As shown, the high-temperature, high-pressure gaseous refrigerant from compressor 17 first reaches the first four-way valve 32, then splits into two paths. One path flows through the first solenoid valve 23 to the first heat exchanger 11, where it exchanges heat with the outside air, transforming the refrigerant into a low-temperature, high-pressure gas-liquid two-phase refrigerant. The other path flows through the second four-way valve 33 to the outdoor heat exchanger 24, where it exchanges heat with the outside air, transforming the refrigerant into a low-temperature, high-pressure gas-liquid two-phase refrigerant. It then passes through the second electronic expansion valve 27. The electronic expansion valve 27 only regulates the flow rate and does not throttle or reduce pressure. Then, the two refrigerants merge before the first electronic expansion valve 26 and flow together through the first electronic expansion valve 26. After throttling and reducing pressure by the first electronic expansion valve 26, they become low-temperature, low-pressure liquid refrigerant. Then, they flow to the second heat exchanger 12, where they absorb the heat from the fresh air outside the pipe and become low-temperature, high-pressure gaseous refrigerant. Then, they return to the first four-way valve 32 and finally return to the compressor's suction port 172, completing one dehumidification cycle.

[0265] Deep dehumidification control:

[0266] Step 1: Power on;

[0267] Step 2: Check the parameters of the outdoor fresh air to see if they meet the requirements of 30℃≤Toa≤35℃ and dsa≥18g / kg DA. If so, continue to step 3.

[0268] Step 3: Set whether the target meets Tsa, set≤16℃, dsa, set≤6g / kg DA. If it meets the target, enter the deep dehumidification mode.

[0269] Step 4: The first solenoid valve 23 is opened, and the second electronic expansion valve 27 is opened at a large angle; the first four-way valve 32 is in heating mode, and the second four-way valve 33 is in cooling mode.

[0270] Step 5: Detection. Based on the temperature and humidity sensor at the fresh air inlet, detect the inlet air temperature Toa and doa. Then, based on the enthalpy efficiency and temperature efficiency of the total heat exchanger core, calculate the temperature and moisture content of the inlet air after passing through the core, i.e. the temperature and moisture content before the second heat exchanger 12, denoted as T13 and d13. Calculate the corresponding dew point temperature TL13 based on T13 and d13.

[0271] Step 6: Determine whether the evaporation temperature satisfies Te≤TL13-θ1, where Te is obtained from the temperature sensor at the inlet liquid pipe of the second heat exchanger 12; if satisfied, the state of the compressor 17 and the first electronic expansion valve 26 remains unchanged; if not satisfied, the compressor 17 increases its frequency while the opening of the first electronic expansion valve 26 is adjusted until the evaporation temperature requirement is met.

[0272] Step 7: Determine whether the air supply parameters meet the conditions Tsa≤Tsa,set-1,dsa≤dsa,set-0.5. If they do, the states of compressor 17 and the first electronic expansion valve 26 remain unchanged. If they do not meet the conditions, return to the condition for correcting the evaporation temperature, i.e. Te≤TL13-θ2, and continue until the air supply parameters are met.

[0273] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

[0274] For ease of explanation, the above description has been provided in conjunction with specific embodiments. However, the above exemplary discussion is not intended to be exhaustive or to limit the embodiments to the specific forms disclosed above. Various modifications and variations can be obtained based on the above teachings. The selection and description of the above embodiments are for the purpose of better explaining the principles and practical applications, thereby enabling those skilled in the art to better utilize the described embodiments and various different variations of embodiments suitable for specific use considerations.

Claims

1. An air conditioning device characterized by comprising: The air conditioning device comprises: an outer shell, an outdoor air inlet, an outdoor air outlet, an indoor air supply outlet and an indoor return air outlet are formed on the outer shell, a first heat exchange cavity, a second heat exchange cavity, a first humidity adjusting cavity and a second humidity adjusting cavity are formed in the outer shell; a first heat exchanger is arranged in the first heat exchange cavity; a second heat exchanger is arranged in the second heat exchange cavity; a first suction device is arranged in the first humidity adjusting cavity; a second suction device is arranged in the second humidity adjusting cavity; a first switching device is used for controlling the communication state of the two humidity adjusting cavities and the two heat exchange cavities; a second switching device is used for controlling the communication state of the outdoor air outlet and the indoor air supply outlet and the two humidity adjusting cavities; a heat recovery core is arranged between the outdoor air inlet, the indoor return air outlet and the heat exchange cavities, and is used for heat exchange of air flow before entering the heat exchange cavities; the indoor return air outlet is communicated with the first heat exchange cavity, and the outdoor air inlet is communicated with the second heat exchange cavity; a compressor is connected with the first heat exchanger and the second heat exchanger through a first four-way valve; a control module is used for controlling the communication state of each switching device and the refrigerant flow direction of a refrigerant circulation flow path; the heat recovery core comprises: a first heat exchange channel, two ends of the first heat exchange channel are respectively communicated with the indoor return air outlet and the first heat exchange cavity; a second heat exchange channel, two ends of the second heat exchange channel are respectively communicated with the outdoor air inlet and the second heat exchange cavity; a D port of the first four-way valve is connected with an exhaust port of the compressor, and an S port of the first four-way valve is connected with an air suction port of the compressor; a C port of the first four-way valve is connected with a first port of the first heat exchanger through a first electromagnetic valve, and an E port of the first four-way valve is connected with a second port of the second heat exchanger; a second port of the first heat exchanger is connected with a first port of the second heat exchanger through a first electronic expansion valve; the control module is configured to control the refrigerant flow direction of the refrigerant circulation flow path according to an air conditioning mode, the air conditioning mode comprises a dehumidification mode and a humidification mode, when the conditioning mode is the dehumidification mode, the control module is configured to: start the compressor, control the first four-way valve to act, communicate the D port of the first four-way valve with the C port thereof, communicate the E port of the first four-way valve with the S port thereof, adjust the opening degree of the first electronic expansion valve, so that the first heat exchanger acts as a condenser, and the second heat exchanger acts as an evaporator; when the conditioning mode is the humidification mode, the control module is configured to: start the compressor, control the first four-way valve to act, communicate the D port of the first four-way valve with the E port thereof, communicate the C port of the first four-way valve with the S port thereof, adjust the opening degree of the first electronic expansion valve, so that the first heat exchanger acts as an evaporator, and the second heat exchanger acts as a condenser.

2. The air conditioning apparatus according to claim 1, wherein the air conditioning device further comprises: an outdoor heat exchanger, a first port of the outdoor heat exchanger is connected with the C port of the first four-way valve, and a second port of the outdoor heat exchanger is connected between the second port of the first heat exchanger and the first electronic expansion valve through a second electromagnetic valve; the control module further comprises a configuration for: obtaining the supply air temperature Tsa and the supply air humidity content dsa at the indoor air supply outlet; obtaining the target temperature Tset indoor and the target humidity content dset indoor; The temperature and humidity judgment step judges whether the Tsa reaches the temperature limit value and the dsa reaches the humidity limit value; When the condition is not met, the compressor frequency is increased, and it is judged whether the compressor frequency reaches the upper limit. When the compressor frequency reaches the upper limit and the condition is still not met, the second electromagnetic valve is opened, and the outdoor fan is started at a wind speed less than the rated wind speed; The temperature and humidity judgment step is returned to. If the condition is met, the current state is maintained until the Tsa and the dsa reach the set values, and then the compressor frequency is reduced. If the condition is not met, the speed of the outdoor fan is increased to the rated wind speed. The temperature and humidity judgment step is returned again. If the condition is still not met, the air inlet amount is reduced.

3. The air conditioning apparatus according to claim 2, wherein The air conditioning device further comprises: A second four-way valve, a D port of the second four-way valve is connected with a first port of the outdoor heat exchanger, an E port of the second four-way valve is connected with a C port of the first four-way valve, a C port of the second four-way valve is connected with an E port of the first four-way valve, and an S port of the second four-way valve is blocked; A second electronic expansion valve connected between the outdoor heat exchanger and the second electromagnetic valve; In the dehumidification mode or the humidification mode, when the second electromagnetic valve needs to be controlled to be opened, the second electronic expansion valve is controlled to be fully opened, and the D port of the second four-way valve is controlled to be communicated with the E port thereof; The air conditioning mode further comprises a defrosting mode, and the defrosting mode comprises a first heat exchanger defrosting mode and an outdoor heat exchanger defrosting mode; In the first heat exchanger defrosting mode, the control module is configured to: close the first electronic expansion valve; start the compressor, control the first four-way valve to act, communicate the D port of the first four-way valve with the C port thereof, communicate the E port of the first four-way valve with the S port thereof, control the second four-way valve to act, communicate the D port of the second four-way valve with the C port thereof, and adjust the opening degree of the second electronic expansion valve, so that the first heat exchanger acts as a condenser and the outdoor heat exchanger acts as an evaporator; In the outdoor heat exchanger defrosting mode, the control module is configured to: close the first electronic expansion valve; start the compressor, control the first four-way valve to act, communicate the D port of the first four-way valve with the E port thereof, communicate the C port of the first four-way valve with the S port thereof, control the second four-way valve to act, communicate the D port of the second four-way valve with the C port thereof, and adjust the opening degree of the second electronic expansion valve, so that the first heat exchanger acts as an evaporator and the outdoor heat exchanger acts as a condenser.

4. The air conditioning apparatus according to claim 2, wherein The air conditioning mode further comprises a non-cooling dehumidification mode; In the non-cooling dehumidification mode, the control module is configured to: close the second electronic expansion valve and open the first electromagnetic valve; obtain the dew point temperature TL13 at the second heat exchanger inlet liquid pipe; obtain the temperature at the second heat exchanger inlet liquid pipe as the evaporation temperature Te, and judge whether the difference between the evaporation temperature Te and the dew point temperature TL13 meets a set range. When the difference between Te and TL13 does not satisfy the set range, the compressor is controlled to reduce frequency, and if the frequency of the compressor has reached the lower limit and the difference between Te and TL13 still does not satisfy the set range, the exhaust fan is controlled to reduce speed until the difference between Te and TL13 satisfies the set range; whether the supply air temperature Tsa satisfies the set range, if yes, the current state is maintained until the difference between the supply air temperature Tsa and the target temperature Tset indoor is within the set error range, and then the compressor is controlled to reduce frequency; if the supply air temperature Tsa does not satisfy the set range, the supply fan is controlled to reduce speed; whether the supply air humidity content dsa satisfies the set range, if yes, the current state is maintained; if the supply air humidity content dsa does not satisfy the set range, the compressor is controlled to increase frequency.

5. The air conditioning apparatus according to claim 2, wherein The air conditioning mode further comprises a deep dehumidification mode; In the deep dehumidification mode, the control module is configured to: open the first electromagnetic valve; control the D port of the first four-way valve to communicate with the C port thereof, and control the D port of the second four-way valve to communicate with the E port thereof; obtain the dew point temperature TL13 at the second heat exchanger inlet liquid pipe; obtain the temperature at the second heat exchanger inlet liquid pipe as the evaporation temperature Te, and determine whether the difference between the evaporation temperature Te and the dew point temperature TL13 satisfies the set range; when the difference between Te and TL13 satisfies the set range, the states of the compressor and the first electronic expansion valve remain unchanged; if not, the compressor is controlled to increase frequency while adjusting the opening degree of the first electronic expansion valve until the difference between Te and TL13 satisfies the set range; determine whether the supply air temperature Tsa and the supply air humidity content dsa satisfy the set range respectively, if yes, the states of the compressor and the first electronic expansion valve remain unchanged; if not, return to the step of determining whether the difference between the evaporation temperature Te and the dew point temperature TL13 satisfies the set range.

6. The air conditioning apparatus according to any one of claims 1 through 5, wherein The control module further comprises a configuration configured to control the first switching device and the second switching device to act, so that the indoor air supply port communicates with the second heat exchange cavity through one of the first humidity adjusting cavity and the second humidity adjusting cavity, and the outdoor exhaust port communicates with the first heat exchange cavity through the other of the first humidity adjusting cavity and the second humidity adjusting cavity.

7. The air conditioning apparatus according to claim 6, wherein The control module further comprises a configuration configured to control the first switching device and the second switching device to switch according to the supply air humidity content of the indoor air supply port, so that the humidity adjusting cavities respectively communicating with the indoor air supply port and the outdoor exhaust port are exchanged.

8. The air conditioning apparatus according to claim 7, wherein The air conditioning device further comprises: a temperature and humidity sensor arranged at the indoor air supply port and used for detecting the supply air humidity content; The control method of the switching of the first switching device and the second switching device comprises: calculating the change rate of the supply air humidity content, when the change rate of the supply air humidity content is not greater than a first set value, and the difference between the supply air humidity content and the maximum humidity content in the current switching period is not greater than a second set value, the first switching device and the second switching device are controlled to switch; before controlling the first switching device and the second switching device to switch, the supply fan and the exhaust fan are controlled to reduce speed; After the first reversing device and the second reversing device are controlled to reverse, the air supply fan and the air exhaust fan are controlled to increase speed, so that the air volume is increased to the rated air volume or the current set air volume within a set time.

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