Fresh air handling unit and control method thereof

Abstract

The application relates to a fresh air unit and a control method thereof, and relates to the technical field of air conditioning. The application aims to solve the problems of complex structure, high energy consumption and health hazards of a rotary dehumidification scheme in a fresh air system. The fresh air unit comprises a fresh air inlet, a first evaporator and an indoor air outlet which are sequentially connected. The fresh air unit further comprises a rotary dehumidifier and a condenser. The rotary dehumidifier comprises a dehumidification channel and a regeneration channel. The dehumidification channel is connected between the first evaporator and the indoor air outlet, and is used for adsorbing moisture in air flowing therethrough. The air inlet side of the regeneration channel is connected with the fresh air inlet through the condenser. The condenser is used for heating air flowing through the regeneration channel and regenerating the rotary dehumidifier. The air outlet side of the regeneration channel is connected with an upstream air duct of the first evaporator.

Description

Technical Field

[0001] This application relates to the field of air conditioning technology, and in particular to a fresh air handling unit and a control method for a fresh air system. Background Technology

[0002] Dehumidification solutions in fresh air systems are typically cooling dehumidification and rotary dehumidification. Cooling dehumidification is mostly used in high humidity environments, while rotary dehumidification is mostly used in low humidity environments. Rotary dehumidification also requires an additional heat source to maintain the regeneration channel.

[0003] In the relevant technical solutions, when the rotary dehumidification component of the fresh air system dehumidifies at high temperature through electric heating, the high temperature and high humidity air generated during the dehumidification process needs to be discharged outdoors through a separate air duct. Furthermore, condensation will occur during the discharge of the high temperature and high humidity air through the air duct, posing a hygiene hazard. In addition, the direct discharge of high temperature air leads to high system energy consumption. Summary of the Invention

[0004] This application provides a fresh air handling unit and its control method to solve the problems of complex structure, high energy consumption and hygiene hazards of rotary dehumidification schemes in fresh air systems.

[0005] In a first aspect, embodiments of this application provide a fresh air handling unit, including a fresh air inlet, a first evaporator, and an indoor air outlet connected in sequence. The fresh air handling unit also includes a rotary dehumidifier and a condenser. The rotary dehumidifier includes a dehumidification channel and a regeneration channel. The dehumidification channel is connected between the first evaporator and the indoor air outlet, and is used to absorb moisture from the air flowing through it. The air inlet side of the regeneration channel is connected to the fresh air inlet via the condenser. The condenser is used to heat the air flowing through the regeneration channel and regenerate the rotary dehumidifier. The air outlet side of the regeneration channel is connected to the upstream air duct of the first evaporator.

[0006] In some implementations, the fresh air handling unit includes a humidifying duct and a recirculating duct. One end of the humidifying duct is connected to the outlet side of the regeneration channel, and the other end is connected to the indoor air outlet. A regeneration return air inlet is provided at the upstream duct of the first evaporator, and the recirculating duct connects the regeneration return air inlet and the regeneration channel. The fresh air handling unit has a humidification mode and a dehumidification mode. In humidification mode, the humidifying duct is configured to be in a conductive state. In dehumidification mode, the rotary dehumidifier is activated and the recirculating duct is configured to be in a conductive state.

[0007] In some implementations, the fresh air unit includes a humidifying air valve and a first return air valve; the humidifying air valve is disposed between the regeneration channel and the humidifying air duct, and is used to control the opening or closing of the humidifying air duct. The first return air valve is connected in series with the circulating air duct, and is used to control the opening or closing of the circulating air duct.

[0008] In some implementations, the fresh air handling unit includes an outdoor exhaust vent and an exhaust valve. The outdoor exhaust vent is located on the air outlet side of the dehumidification channel, and the exhaust valve is used to control the opening or closing of the outdoor exhaust vent.

[0009] In some embodiments, the indoor air outlet includes a first air outlet and a second air outlet. The first air outlet is connected to the air outlet side of the dehumidification duct, and the second air outlet is connected to the humidification duct. At least the first air outlet is provided with an air supply valve for controlling the opening or closing of the first air outlet.

[0010] In some embodiments, the fresh air handling unit further includes a second evaporator and a second return air valve. The second evaporator is disposed in the duct between the dehumidification channel and the indoor air outlet, and is used to regulate the temperature of the air flowing to the indoor air outlet. A return air inlet is provided in the duct between the second evaporator and the dehumidification channel, and the second return air valve is disposed at the return air inlet to control the opening or closing of the return air inlet.

[0011] In some implementations, the fresh air handling unit includes a supply fan that extends from the fresh air inlet through a dehumidification duct to the indoor air outlet, with the supply fan located in the duct between the fresh air inlet and the indoor air outlet. In some embodiments, at least one of a first filter, a second filter, and a regeneration filter is included; the first filter is connected in series in the upstream duct of the first evaporator, the second filter is connected in series in the duct between the second evaporator and the return air inlet, and the regeneration filter is connected in series in the upstream duct of the condenser.

[0012] In some embodiments, the fresh air handling unit includes a control module, a first temperature and humidity sensor, and a second temperature and humidity sensor. The control module controls the operating status of the first evaporator, condenser, and rotary dehumidifier. The first temperature and humidity sensor is located on the air inlet side of the first evaporator and is communicatively connected to the control module to detect the fresh air temperature and humidity. The second temperature and humidity sensor is located on the air outlet side of the dehumidification channel and is communicatively connected to the control module to detect the temperature and humidity of the first air flowing through the dehumidification channel.

[0013] In some embodiments, the rotary dehumidifier includes a rotary core and a motor-driven regeneration fan. The motor drives the rotary core to rotate and switch between the dehumidification channel and the regeneration channel. The regeneration fan is located in the upstream or downstream air duct of the regeneration channel.

[0014] In some implementations, the fresh air handling unit includes a regeneration valve disposed in the duct between the condenser and the fresh air inlet.

[0015] In some implementations, the regeneration temperature of the regeneration channel is 45-65°C. Secondly, embodiments of this application provide a control method for a fresh air handling unit, used to control the fresh air handling unit in the first aspect, the control method including: Control the start-up of the fresh air handling unit.

[0016] Obtain the target indoor humidity and target temperature, and calculate the preset humidity range based on the target humidity, target temperature and deviation value.

[0017] After a first preset time period, the first air humidity and first air temperature on the air outlet side of the dehumidification channel are collected, and the first humidity value is calculated based on the first air humidity and first air temperature. The first humidity value is then compared with the preset humidity range.

[0018] If the first humidity value is within the preset humidity range, the fresh air unit is controlled to maintain its current operating state, and the value is re-detected and compared after the first preset time.

[0019] In some implementations, after the step of comparing a first humidity value with a preset humidity range, the control method includes: If the first humidity value is outside the preset humidity range, control the collection of fresh air temperature and fresh air humidity, calculate the fresh air humidity value based on the fresh air temperature and fresh air humidity, and compare the fresh air humidity value with the upper limit of the preset humidity range.

[0020] If the humidity value of the fresh air is greater than the preset humidity range, the first evaporator will be activated.

[0021] After a second preset time period, the first humidity value of the dehumidification channel on the air outlet side is obtained, and the first humidity value is compared with the preset humidity range.

[0022] If the first humidity value is less than or equal to the upper limit of the preset humidity range, the first evaporator remains in operation.

[0023] If the first humidity value is greater than the lower limit of the preset humidity range, the rotary dehumidifier will be activated and switched to dehumidification mode.

[0024] After a third preset time period, the first humidity value of the dehumidification channel on the air outlet side is obtained, and the first humidity value is compared with the preset humidity range.

[0025] If the first humidity value is within the preset humidity range, maintain the current operating status of the fresh air unit.

[0026] In some embodiments, after the steps of controlling the acquisition of fresh air temperature and humidity, calculating fresh air humidity value based on fresh air temperature and humidity, and comparing fresh air humidity value with the upper limit of the preset humidity range if the first humidity value is outside the preset humidity range, the control method includes: If the fresh air humidity value is less than or equal to the upper limit of the preset humidity range, the fresh air humidity value will be re-detected after the fourth preset time period, and compared with the upper limit of the preset humidity range.

[0027] If the fresh air humidity value is less than or equal to the upper limit of the preset humidity range, the rotary dehumidifier will be activated and the fresh air unit will be switched to humidification mode.

[0028] If the fresh air humidity value is greater than the maximum value of the preset humidity range, after the first preset time, the first humidity value is re-acquired and compared with the preset humidity range.

[0029] Thirdly, this application provides a control module, including at least one communication interface, at least one bus connected to the at least one communication interface, at least one processor connected to the at least one bus, and at least one memory connected to the at least one bus. The processor is configured to execute the control method for the fresh air handling unit in the second aspect.

[0030] Fourthly, this application also provides a computer storage medium storing computer-executable instructions for executing the control method of the fresh air handling unit in the third aspect.

[0031] The technical solutions provided in this application have the following advantages compared with the prior art: Compared to existing technologies that require additional exhaust ducts to discharge heated and humidified air from the regeneration channel outdoors, this application connects the outlet side of the regeneration channel to the upstream duct of the first evaporator, allowing the circulating duct connecting the two to be located within the main structure of the fresh air unit. This eliminates the need for a long exhaust duct that spans walls and beams within the indoor space, significantly reducing the length of the circulating duct and simplifying its connection and fixing. Furthermore, the circulating duct can be pre-assembled at the factory, eliminating the need for on-site installation. This effectively simplifies the spatial layout and installation of the fresh air unit.

[0032] Furthermore, in this application's scheme, the fresh air flows sequentially through the condenser and the first evaporator without any additional air exhaust. In the duct, heat flows with the air between the condenser (for regenerative heating) and the first evaporator (for cooling and dehumidification). In the refrigerant piping system, heat flows with the refrigerant between the first evaporator and the condenser, thus achieving heat recycling, reducing heat loss and lowering the energy consumption of the fresh air handling unit, thereby improving the energy efficiency ratio of the fresh air handling unit.

[0033] Meanwhile, the heated and humidified air in the circulating air duct can be cooled and dehumidified when it flows through the first evaporator, thereby reducing the relative humidity of the air and keeping the circulating air duct relatively dry to avoid the accumulation of condensation over a long period of time, thus solving the hygiene problems caused by high humidity environments. Attached Figure Description

[0034] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0035] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0036] One or more embodiments are illustrated by way of example with reference numerals in the accompanying drawings. These illustrations do not constitute a limitation on the embodiments. Elements with the same reference numerals in the drawings are denoted as similar elements. Unless otherwise stated, the figures in the drawings are not to be limited by scale.

[0037] Figure 1 This is a schematic diagram of the structure of a fresh air handling unit provided in an embodiment of this application; Figure 2 This is a schematic diagram of another fresh air handling unit provided in an embodiment of this application; Figure 3 This is a schematic diagram of a refrigerant circulation system in a fresh air handling unit; Figure 4 This is a schematic diagram of an electrical connection for the control module in a fresh air handling unit. Figure 5 A flowchart illustrating a control method for a fresh air handling unit provided in this application embodiment; Figure 6 This is a schematic diagram of the connection structure of a control module provided in an embodiment of this application.

[0038] Icon labels: 100. First air duct section; 200. Second air duct section; 11. Fresh air inlet; 12. Indoor air outlet; 121. First air outlet; 122. Second air outlet; 13. Outdoor exhaust outlet; 14. Return air outlet; 15. Regeneration return air outlet; 20. Refrigerant circulation system; 21. First evaporator; 22. Condenser; 23. Second evaporator; 24. Throttling device; 25. Four-way valve; 26. Compressor; 27. Flow valve; 30. Rotary dehumidifier; 31. Dehumidification channel; 32. Regeneration channel; 33. Rotary core; 34. Motor; 35. Regeneration fan; 41. Humidifying air duct; 42. Circulating air duct; 51. Humidifying air valve; 52. First return air valve; 53. Exhaust valve; 54. Supply air valve; 55. Second return air valve; 56. Regeneration air valve; 61. Supply air fan; 62. First filter; 63. Second filter; 64. Regeneration filter; 71. Control module; 711. Processor; 712. Communication interface; 713. Memory; 714. Communication bus; 72. First temperature and humidity sensor; 73. Second temperature and humidity sensor; 74. Third temperature and humidity sensor; 75. Fourth temperature and humidity sensor; 76. Fifth temperature and humidity sensor. Detailed Implementation

[0039] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0040] The following disclosure provides numerous different embodiments or examples for implementing various structures of this application. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the scope of this application. Furthermore, reference numerals and / or letters may be repeated in different examples. Such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed.

[0041] For ease of description, spatial relative terms may be used in the text to describe the relative position or movement of one element or feature relative to another element or feature, as shown in the figure. These relative terms include, for example, "inside," "outside," "middle," "outer," "below," "below," "above," "front," "back," etc. Such spatial relative terms are intended to include different orientations of the device in use or operation, other than those depicted in the figure. For example, if the device in the figure undergoes a positional flip, orientation change, or change of motion, these directional indications will change accordingly. For instance, an element described as "below other elements or features" or "below other elements or features" will subsequently be oriented "above other elements or features" or "above other elements or features." Therefore, the example term "below" can include both upper and lower orientations. The device may be otherwise oriented (rotated 90 degrees or in other directions), and the spatial relative descriptors used in the text will be interpreted accordingly.

[0042] Please see Figures 1 to 6 This application provides a fresh air handling unit and its control method to solve the shortcomings of rotary dehumidification schemes used in fresh air systems, such as complex structure, high energy consumption and hygiene hazards.

[0043] In the first aspect, the application provides a fresh air handling unit, which is used to introduce outdoor fresh air and treat it (such as filtering, heating, cooling, dehumidifying, humidifying, etc.), and then deliver the treated fresh air into the room to improve indoor air quality.

[0044] like Figure 1 and Figure 2 As shown, the fresh air handling unit includes a fresh air inlet 11, a first evaporator 21, and an indoor air outlet 12 connected in sequence. The unit also includes a rotary dehumidifier 30 and a condenser 22. The rotary dehumidifier 30 includes a dehumidification channel 31 and a regeneration channel 32. The dehumidification channel 31 connects the first evaporator 21 and the indoor air outlet 12, and is used to absorb moisture from the air flowing through it. The air inlet side of the regeneration channel 32 is connected to the fresh air inlet 11 via the condenser 22. The condenser 22 heats the air flowing through the regeneration channel 32 and regenerates the rotary dehumidifier 30. The air outlet side of the regeneration channel 32 is connected to the upstream air duct of the first evaporator 21.

[0045] Among them, the fresh air inlet 11 is the inlet in the fresh air handling unit used to introduce outdoor fresh air. One or more fresh air inlets 11 can be set up as needed. The fresh air handling unit is used to deliver treated fresh air or mixed air into the room through the indoor air outlet 12.

[0046] For example, the fresh air unit includes a fresh air main pipe, a first fresh air duct, and a second fresh air duct. One end of the fresh air main pipe is connected to the fresh air inlet 11, and the other end of the fresh air main pipe is connected to the first fresh air duct and the second fresh air duct. The first fresh air duct is connected to the air inlet side duct of the first evaporator 21, and the second fresh air duct is connected to the air inlet side of the regeneration channel.

[0047] Combination Figure 3 The first evaporator 21 and the condenser 22 are components of the refrigerant circulation system. The circulating refrigerant absorbs heat at the first evaporator 21 to achieve cooling and dehumidification, and releases heat at the condenser 22 to meet the heating and regeneration effect of the rotary dehumidifier 30, so as to achieve continuous dehumidification and cooling and have a high energy efficiency ratio.

[0048] The rotary dehumidifier 30 uses a moisture-absorbing material to absorb moisture from the air flowing through it, thus achieving a dehumidification effect. It can also release the absorbed moisture through heating to complete a regeneration cycle.

[0049] For example, the rotary dehumidifier 30 also includes a rotary core 33 and a motor 34. The rotary core 33 is made of moisture-absorbing material and is driven to rotate by the motor 34. This causes air to flow through a portion of the rotary core 33 (such as the dehumidification zone) within the dehumidification channel 31 to absorb moisture from the air and achieve dehumidification. Simultaneously, in the regeneration channel 32, another portion of the air, after being heated by the condenser 22, flows through another portion of the rotary core 33 (such as the regeneration zone) to carry away the moisture precipitated in the regeneration zone, thus achieving the regeneration cycle of the rotary core 33.

[0050] Thus, the motor 34 drives the rotor core 33 to rotate and switch between the dehumidification channel 31 and the regeneration channel 32, so that the rotor core 33 can achieve continuous dehumidification and heating regeneration effects, repeating the cycle.

[0051] Since the air flowing through the first evaporator 21 is saturated with humidity at a low temperature after dehumidification, a dehumidification channel 31 is connected to the air outlet side duct of the first evaporator 21. This allows the dehumidification channel 31 to continue absorbing the air that has undergone preliminary dehumidification in the cooling zone of the first evaporator 21, further reducing the moisture content in the air and effectively lowering the moisture content of the fresh air. This helps to further reduce the lower limit of indoor air humidity regulation, i.e., improve the effective regulation range of indoor air.

[0052] The regeneration channel 32 is connected to the fresh air inlet 11 via the condenser 22 (e.g., through a second fresh air duct) on its air inlet side to introduce heated fresh air and allow it to flow through the regeneration channel 32. Furthermore, the regeneration channel 32 is connected to the upstream air duct of the first evaporator 21 on its air outlet side. For example, a regeneration return air inlet can be provided on the side wall of the upstream air duct of the first evaporator 21, and a circulating air duct can be configured to connect the regeneration return air inlet and the air outlet side of the regeneration channel 32.

[0053] The heated and humidified air, after being processed by the regeneration channel 32 of the rotary dehumidifier 30, is guided to the air inlet side of the first evaporator 21, where it is cooled and dehumidified by the first evaporator 21. Thus, the fresh air and regeneration airflow, after being mixed and cooled and dehumidified once by the first evaporator 21, can also continue to flow through the dehumidification channel 31 for secondary dehumidification. The mixed air, having reached the target humidity, is then sent into the room through the indoor air outlet 12 to regulate and reduce indoor humidity.

[0054] Compared to existing technologies that require additional exhaust ducts to discharge heated and humidified air from the regeneration channel outdoors, this application connects the outlet side of the regeneration channel 32 to the upstream duct of the first evaporator 21, allowing the circulating duct connecting the two to be located within the main structure of the fresh air unit. This eliminates the need for a long exhaust duct that spans walls and beams within the indoor space, significantly reducing the length of the circulating duct and simplifying its connection and fixing. Furthermore, the circulating duct can be pre-assembled at the factory, eliminating the need for on-site installation. This effectively simplifies the spatial layout and installation of the fresh air unit.

[0055] Furthermore, in this application's solution, the fresh air flows sequentially through the condenser 22 and the first evaporator 21 without any additional air exhaust. In the air duct, heat flows with the air between the condenser 22 (for regeneration heating) and the first evaporator 21 (for cooling and dehumidification). In the refrigerant piping system, heat flows with the refrigerant between the first evaporator 21 and the condenser 22, thereby achieving heat recycling, reducing heat loss, lowering the energy consumption of the fresh air handling unit, and thus improving the energy efficiency ratio of the fresh air handling unit.

[0056] Meanwhile, the heated and humidified air in the circulating air duct can be cooled and dehumidified when it flows through the first evaporator 21, so as to reduce the relative humidity of the air and keep the circulating air duct relatively dry to avoid the accumulation of condensation for a long time, thereby solving the hygiene problems in high humidity environments.

[0057] Furthermore, since the moisture in the fresh air is condensed and precipitated uniformly at the first evaporator 21, there is no need for collection and diversion structures for condensate in other locations, further simplifying the structure of the fresh air unit.

[0058] In some embodiments, such as Figure 1 and Figure 2As shown, the fresh air handling unit includes a humidifying air duct 41 and a circulating air duct 42. One end of the humidifying air duct 41 is connected to the air outlet side of the regeneration channel 32, and the other end is connected to the indoor air outlet 12. One end of the circulating air duct 42 is connected to the air outlet side of the regeneration channel 32, and the other end is connected to the upstream air duct of the first evaporator 21. If the upstream air duct of the first evaporator 21 is provided with a regeneration return air inlet 15, the circulating air duct 42 connects the regeneration return air inlet 15 and the regeneration channel 32.

[0059] Among them, the circulating air duct 42, the humidifying air duct 41 and other air duct structures in this application are pipes used to guide airflow. Their structures can be set as rectangular or circular air ducts, etc., and the materials are usually galvanized steel plates, stainless steel or plastic pipes, and the outer wall can be insulated as needed.

[0060] The fresh air unit is configured to have at least a humidification mode and a dehumidification mode, wherein the dehumidification mode includes a first dehumidification mode and a second dehumidification mode.

[0061] In humidification mode, the humidification duct 41 is configured to be open. In dehumidification mode, the rotary dehumidifier 30 is activated and the circulating duct 42 is configured to be open.

[0062] For example, the fresh air handling unit also includes a humidifying air valve 51 and a first return air valve 52. The humidifying air valve 51 is disposed between the regeneration channel 32 and the humidifying air duct 41, and is used to control the opening or closing of the humidifying air duct 41, so as to control whether the humidified air flowing out of the regeneration channel 32 is blown into the room. The first return air valve 52 is connected in series with the circulation air duct 42, and is used to control the opening or closing of the circulation air duct 42, so as to control whether the air flowing out of the regeneration channel 32 flows through the first evaporator 21.

[0063] For example, the regeneration channel 32, the humidifying air valve 51 and the humidifying air duct 41 are connected in series. For example, the air outlet side of the regeneration channel 32 is provided with a three-way air duct, one end of which is connected to the regeneration channel 32, one end of which is connected to the humidifying air valve 51 and the humidifying air duct 41, and the last end of which is connected to the circulating air duct 42 to prevent humid air from entering the humidifying air duct 41.

[0064] Alternatively, a humidifying valve 51 can be connected in series at other locations in the humidifying air duct 41; there are no restrictions on this.

[0065] The first return air valve 52 can be connected in series between the regeneration channel 32 and the circulation duct 42, such as between the circulation duct 42 and one end of the aforementioned three-way air duct. Alternatively, the first return air valve 52 can be located at the regeneration return air inlet 15; there is no limitation on this.

[0066] Based on this, in the first dehumidification mode, fresh air flows sequentially from the fresh air inlet 11 through the first evaporator 21 and the dehumidification channel 31 before entering the room through the indoor air outlet 12. At this time, the first evaporator 21 is activated to cool the flowing fresh air, thereby achieving a cooling and dehumidification effect. Meanwhile, the rotary dehumidifier 30 is in a closed state, ensuring that the humidity value (i.e., moisture content) of the fresh air after one dehumidification process changes little or almost unchanged when flowing through the dehumidification channel 31. In other words, in the first dehumidification mode, the fresh air unit only performs preliminary cooling and dehumidification through the first evaporator 21, thus achieving preliminary regulation of indoor humidity.

[0067] In the second dehumidification mode, the rotary dehumidifier 30, condenser 22, and first evaporator 21 are all in the start-up state, that is, the humidifying air valve 51 is closed and the first return air valve 52 is open. Part of the fresh air flows from the fresh air inlet 11 through the condenser 22, regeneration channel 32, circulation air duct 42, and regeneration return air inlet 15 into the air inlet side of the first evaporator 21, and mixes with another part of the fresh air that flows directly from the fresh air inlet 11 to the first evaporator 21.

[0068] In this process, as the fresh air flows through the regeneration channel 32, it is heated by the condenser 22 and carries away the moisture extracted from the rotor core 33, thus achieving the regeneration and circulation effect of the rotor core 33. On the air inlet side of the first evaporator 21, the mixed fresh air has a higher temperature and greater humidity than the fresh air inlet 11. The mixed fresh air is cooled and dehumidified when it flows through the first evaporator 21 (i.e., primary dehumidification), and then, as it flows through the dehumidification channel 31, some moisture is absorbed by the rotor core 33 within the dehumidification channel 31, thus achieving secondary dehumidification to significantly reduce the relative humidity and water content of the fresh air, thereby meeting a wide range of indoor humidity regulation requirements.

[0069] During this process, the rotor core 33 absorbs moisture and increases its water content in part of the dehumidification channel 31. By rotating and switching the position of the rotor core 33 within the dehumidification channel 31 and the regeneration channel 32, the moisture adsorbed by the rotor core 33 can be heated and precipitated in the regeneration channel 32 to reduce its water content. In other words, by alternately switching the area of ​​the rotor core 33 within the dehumidification channel 31 and the regeneration channel 32, the moisture adsorbed within the fresh air unit can be transported to the regeneration channel 32 and ultimately collected and condensed in the water collection tray below the first evaporator 21 for discharge. This simplifies the unit configuration by requiring only a water collection and drainage structure at the bottom of the first evaporator 21.

[0070] Meanwhile, heat flows from the condenser 22 to the first evaporator 21 under the influence of air, and then from the first evaporator 21 to the condenser 22 under the influence of refrigerant, thereby realizing the recycling of heat, reducing the energy consumption of the fresh air unit and improving the energy efficiency ratio.

[0071] The fresh air unit can also be switched to humidification mode. In humidification mode, the humidification air valve 51 is open and the first return air valve 52 is closed, and the rotary dehumidifier 30, condenser 22, and first evaporator 21 are all in the starting state. Fresh air is separated into humidified air and recirculated air through the fresh air inlet 11. The humidified air flows sequentially through the condenser 22, regeneration channel 32, humidification air valve 51, and humidification air duct 41, and is blown into the room through the indoor air outlet 12 to increase the indoor air humidity. When the humidified air flows through the condenser 22, it absorbs heat from the condenser, and when it flows through the regeneration channel 32, it absorbs moisture from the rotary core 33 to increase humidity.

[0072] Correspondingly, the circulating air is cooled and dehumidified by the first evaporator 21 and the dehumidification channel 31 before being discharged, so as to achieve balance in the refrigerant circulation system and at the same time meet the overall moisture balance of the rotor core 33.

[0073] It should be noted that the humidification mode is mostly used in dry environments during winter (i.e., low temperature). In this case, the humidification mode can provide heated humidified air to the room, achieving the effect of heating and humidifying. In this process, the rotating core 33 can extract moisture from the fresh air in the dehumidification channel 31 into the regeneration channel 32 and directly send it into the room, without the need for an external water source or electric heating humidifier, achieving a green humidification operation with extremely low energy consumption and cleanliness.

[0074] To facilitate the removal of the aforementioned recirculated air, such as Figure 1 and Figure 2 As shown, the fresh air unit includes an outdoor exhaust vent 13 and an exhaust valve 53. The outdoor exhaust vent 13 is located on the air outlet side of the dehumidification channel 31, and the exhaust valve 53 is used to control the opening or closing of the outdoor exhaust vent 13. That is, by setting the outdoor exhaust vent 13 in the downstream air duct of the dehumidification channel 31, such as the outdoor exhaust vent 13 being connected in parallel with the indoor air outlet 12, the outdoor exhaust vent 13 is opened and the indoor air outlet 12 is closed in humidification mode to discharge the cooled and dehumidified circulating air.

[0075] An exhaust valve 53 is installed at the outdoor exhaust vent 13 to selectively open or close the outdoor exhaust vent 13 as needed. For example, in the first dehumidification mode and the second dehumidification mode, the exhaust valve 53 can be controlled to close the outdoor exhaust vent 13 to prevent the dehumidified fresh air from flowing to the outside instead of flowing to the inside.

[0076] In some embodiments, such as Figure 1 As shown, the indoor air outlet 12 includes a first air outlet 121 and a second air outlet 122. The first air outlet 121 is connected to the air outlet side of the dehumidification channel 31, and the second air outlet 122 is connected to the humidification air duct 41. At least the first air outlet 121 is provided with an air supply valve 54 for controlling the opening or closing of the first air outlet 121.

[0077] For example, in the first dehumidification mode and the second dehumidification mode, the first air outlet 121 is opened to send fresh air or mixed air with appropriate humidity into the room, thereby adjusting the indoor humidity to a suitable range.

[0078] In humidification mode, the supply air valve 54 is controlled to close the first air outlet 121, and the exhaust air valve 53 is controlled to open the outdoor exhaust outlet 13, while the second air outlet 122 remains open. This allows humidified fresh air to flow into the room through the second air outlet 122 to increase indoor temperature and humidity. Simultaneously, another portion of the low-temperature, low-humidity fresh air used for auxiliary circulation is exhausted through the outdoor exhaust outlet 13.

[0079] Since the upstream air ducts of the first air outlet 121 and the outdoor exhaust outlet 13 have an intersection point, the closed first air outlet 121 can prevent low-temperature and low-humidity fresh air from flowing into the room.

[0080] Alternatively, an air supply valve 54 can be configured at the second air outlet 122 to switch the opening and closing states of the first air outlet 121 and the second air outlet 122 by controlling the two air supply valves 54 separately.

[0081] In some embodiments, such as Figure 1 and Figure 2 As shown, the fresh air unit includes a fresh air host and a first air duct section 100 and a second air duct section 200 connected in sequence. The first air duct section 100 is used to regulate the temperature and humidity of the fresh air. For example, the first evaporator 21 and the dehumidification channel 31 are arranged in the first air duct section 100 in sequence along the flow direction of the fresh air.

[0082] Continue to refer to Figure 1 The fresh air handling unit also includes a second evaporator 23 and a second return air valve 55.

[0083] The second evaporator 23 is disposed within the second air duct section 200. That is, the second evaporator 23 is disposed within the air duct between the dehumidification channel 31 and the indoor air outlet 12. The second evaporator 23 is used to regulate the temperature of the air flowing towards the indoor air outlet 12, such as cooling the fresh air (or mixed air) or heating the fresh air (or mixed air).

[0084] A return air inlet 14 is provided in the air duct between the second evaporator 23 and the dehumidification channel 31 (such as on the side wall or at an additional T-junction). A second return air valve 55 is provided at the return air inlet 14 to control the opening or closing of the return air inlet 14. That is, a return air inlet 14 is provided on the side wall of the second air duct section 200 near the first air duct section 100. This return air inlet 14 is located upstream of the second evaporator 23 and is used to absorb indoor air to regulate its temperature and humidity through the second evaporator 23.

[0085] Thus, by opening the second return air valve 55 and the supply air valve, indoor air can circulate between the indoor space and the second evaporator 23, and the temperature and humidity of the indoor air can be regulated by the second evaporator 23.

[0086] During this process, fresh air can also be introduced through the first air duct section 100. This fresh air can be cooled, heated, or dehumidified and mixed with indoor air within the first air duct section 100 to ensure that the mixed air has a suitable temperature or humidity. Then, the mixed air is heated or cooled by the second evaporator 23 so that the mixed airflow blown into the room contains fresh air, thereby improving indoor air quality, such as better freshness and higher oxygen content.

[0087] In this embodiment of the application, the fresh air handling unit requires a fan to drive the air circulation. For example... Figure 1 and Figure 2 As shown, the fresh air handling unit includes a supply air fan 61. Fresh air flows from the fresh air inlet 11 through the dehumidification channel 31 to the indoor air outlet 12. The supply air fan 61 is located within the duct between the fresh air inlet 11 and the indoor air outlet 12. That is, the supply air fan 61 is located within the first duct section 100 or the second duct section 200.

[0088] For example, the regenerator fan 35 is located in the second air duct section 200 and downstream of the second evaporator 23, so as to drive fresh air from the fresh air inlet 11 through the first evaporator 21, the dehumidification channel 31, and the second evaporator 23 to the first air outlet 121 or the outdoor exhaust outlet 13.

[0089] Correspondingly, such as Figure 1 and Figure 2 As shown, the rotary dehumidifier 30 may include a regeneration fan 35, which is connected in series in the upstream or downstream air duct of the regeneration channel 32 to drive fresh air to flow along the trajectory in the second dehumidification mode or humidification mode.

[0090] Among them, such as Figure 1 and Figure 2 As shown, the fresh air handling unit includes at least one of a first filter 62, a second filter 63, and a regeneration filter 64.

[0091] The first filter 62 is connected in series in the upstream air duct of the first evaporator 21. It filters and purifies the fresh air entering the fresh air unit, effectively intercepting large particles, dust, pollen, and other pollutants. This protects downstream components such as the first evaporator 21, rotor core 33, second evaporator 23, air supply fan 61, and various air valves from contamination and blockage, extending their service life. Specifically, the first filter 62 is located in the air duct between the first evaporator 21 and the regeneration return air inlet 15, or it is located in the upstream first air duct section 100 of the regeneration return air inlet 15, along the direction of fresh air flow.

[0092] The second filter 63 is connected in series in the duct between the second evaporator 23 and the return air inlet 14, mainly used to filter the return air in the room. The regeneration filter 64 is connected in series in the upstream duct of the condenser 22. It filters the fresh air flowing through the regeneration channel 32 to protect the condenser 22, the impeller core 33 in the regeneration channel 32, the regeneration fan 35, and the humidifying air valve 51 (or the first return air valve 52) from dust and particulate matter, ensuring the cleanliness of the regenerated air.

[0093] Among them, such as Figure 1 and Figure 2 As shown, the fresh air handling unit includes a regeneration air valve 56, which is located in the duct between the condenser 22 and the fresh air inlet 11. The regeneration air valve 56 is used to regulate the airflow within the regeneration channel 32 and can open or close the regeneration channel 32. For example, in the second dehumidification mode or humidification mode, the regeneration air valve 56 is opened and the rotary dehumidifier 30 is started; in the first dehumidification mode, the regeneration air valve 56 is closed and the rotary dehumidifier 30 is turned off.

[0094] In some embodiments, such as Figure 3 As shown, the fresh air handling unit includes a refrigerant circulation system 20, which includes a condenser 22, a throttle valve 24, and a first evaporator 21 connected in sequence. The four ports of a four-way valve 25 are connected in sequence to one end of the first evaporator 21, one end of the condenser 22, and the air inlet and outlet of the compressor 26. A second evaporator 23 is connected in parallel with the first evaporator 21 via a flow valve 27. This allows the compressor 26 to drive the refrigerant to circulate between the first evaporator 21 and the condenser 22, and the four-way valve 25 switches between cooling (dehumidification) and heating modes of the refrigerant circulation system 20.

[0095] The refrigerant circulation system 20 also includes one or more flow valves 27. Along the refrigerant flow direction, the second evaporator 23 is connected in parallel at both ends of the first evaporator 21, and at least one of the first evaporator 21 and the second evaporator 23 is connected in series with a flow valve 27.

[0096] At this time, the flow valve 27 can be opened to simultaneously put the first evaporator 21 and the second evaporator 23 into dehumidification or heating mode, and the temperature range of the first evaporator 21 and / or the second evaporator 23 can be adjusted by regulating the opening degree of the flow valve 27 (between 0% and 100%). Closing the flow valve 27 at one of the evaporators will prevent that evaporator from being connected to the refrigerant circulation system, that is, it will not heat or cool the air flowing through it.

[0097] In some embodiments, such as Figure 1 and Figure 3 As shown, the fresh air unit includes at least one of a first temperature and humidity sensor 72, a second temperature and humidity sensor 73, a third temperature and humidity sensor 74, a fourth temperature and humidity sensor 75, and a fifth temperature and humidity sensor 76.

[0098] The first temperature and humidity sensor 72 is located on the air inlet side of the first evaporator 21 and is used to detect the temperature and humidity of the fresh air.

[0099] The second temperature and humidity sensor 73 is located on the air outlet side of the dehumidification channel 31 to detect the temperature and humidity of the first air flowing through the dehumidification channel 31. This air has been regulated by the first evaporator 21 and the dehumidification channel 31, meaning the first air temperature and humidity are the regulated air temperature and humidity. If the first evaporator 21 and the rotary dehumidifier 30 are not activated, the first air temperature and the first air humidity are consistent with the fresh air temperature and the fresh air humidity. The third temperature and humidity sensor 74 is located on the air outlet side of the regeneration channel 32 to detect the temperature and humidity of the air flowing out of the regeneration channel 32.

[0100] For example, in the second dehumidification mode, a portion of the fresh air is condensed and heated, thereby heating the rotor core 33 in the downstream regeneration channel 32. The dehumidification of the rotor core 33 humidifies the heated air. Subsequently, driven by the regeneration fan 35, the heated and humidified fresh air passes through the first return air valve 52, the first evaporator 21, the dehumidification channel 31, and the second temperature and humidity sensor 73 for synchronous dehumidification.

[0101] When the second temperature and humidity sensor 73 detects that the first air temperature and the first air humidity meet the standards, the condenser 22 maintains its current operating state.

[0102] When the first air humidity is too high, the refrigerant flow rate in the condenser 22 is increased to enhance the regeneration and dehumidification effect on the rotor core 33 through a higher temperature, so that the rotor core 33 has a better dehumidification effect in the dehumidification channel 31, and at the same time, the cooling and dehumidification effect of the first evaporator 21 is increased to reduce the first air humidity.

[0103] When the initial air humidity is too low, the flow rate of refrigerant in the condenser 22 is reduced until the dehumidification intensity is reduced and the condenser 22 is shut off. If the condenser 22 is detected to be in a closed state for a continuous period of time, the air temperature and humidity on the outlet side of the regeneration channel 32 are detected by the third temperature and humidity sensor 74. When the humidity value (i.e., moisture content) is not greater than the humidity value detected by the first temperature and humidity sensor 72, the rotary dehumidifier 30 is shut off, and the regeneration air valve 56 and the first return air valve 52 are closed at the same time.

[0104] In humidification mode, due to the low indoor humidity, a portion of the fresh air passes through the dehumidification channel 31's rotor core 33, where its moisture content is transferred to the regeneration channel 32. This portion of fresh air, heated and humidified, flows through the regeneration channel 32 and is then directly supplied to the room via the humidification valve 51. A third temperature and humidity sensor 74 detects the air temperature and humidity on the outlet side of the regeneration channel 32. When the humidity of the heated and humidified fresh air is too high, the flow rate of the refrigerant in the condenser 22 is reduced to decrease the humidification intensity. When the humidity of the heated and humidified fresh air is too low, the flow rate of the refrigerant in the condenser 22 is increased to enhance the heating and humidification effect. In this humidification mode, the humidification source is the moisture in the fresh air, eliminating the need for an additional water source.

[0105] In this system, indoor return air is guided to the second evaporator 23 via return air inlet 14 and mixed with fresh air introduced through the first air duct section 100. By installing a fourth temperature and humidity sensor 75 on the air inlet side of the second evaporator 23, the temperature and humidity of the air flowing through the second evaporator 23 can be accurately detected, thereby calculating the moisture content. Meanwhile, a fifth temperature and humidity sensor 76 installed on the air outlet side of the second evaporator 23 can accurately detect the temperature and humidity of the air ultimately flowing into the room, thus improving the accuracy of the fresh air unit's temperature and humidity regulation.

[0106] In some embodiments, such as Figure 4 As shown, the fresh air handling unit also includes a control module 71, used to control the operating status of the first evaporator 21, condenser 22, and rotary dehumidifier 30. For example, the control module 71 is communicatively connected to the first temperature and humidity sensor 72, the second temperature and humidity sensor 73, the third temperature and humidity sensor 74, the fourth temperature and humidity sensor 75, and the fifth temperature and humidity sensor 76 to obtain corresponding temperature and humidity parameters, and can calculate the corresponding moisture content based on the temperature and humidity parameters.

[0107] In addition, the control module 71 is electrically connected to the throttle valve 24, four-way valve 25, compressor 26, flow valve 27, motor 34, regeneration fan 35, and supply fan 61. Furthermore, the humidifying air valve 51, first return air valve 52, exhaust air valve 53, supply air valve 54, second return air valve 55, and regeneration air valve 56 are electrically controlled valves and are electrically connected to the control module 71. This allows the control module 71 to independently adjust the operating status of the aforementioned components, thereby switching the operating mode of the fresh air unit, such as first dehumidification mode, second dehumidification mode, humidification mode, cooling mode, heating mode, and supply air mode.

[0108] It should be emphasized that, in this embodiment, the regeneration temperature of the regeneration channel 32 is set to 45-65℃, meaning that the rotor core 33 can achieve regeneration circulation by passing through a heated airflow in the regeneration channel 32 within the range of 45-65℃. Since the regeneration circulation has a relatively low heating temperature, the regeneration heating effect of the rotor core 33 can be achieved simply by the participation of the condenser 22, without the need for an additional electric heater, thereby saving regeneration energy consumption and significantly improving the energy efficiency ratio of the fresh air handling unit.

[0109] For example, the main adsorption and regeneration medium of the rotor core 33 is a metal-organic framework (MOF) material. For instance, the heating and regeneration temperature of chromium-based MOF materials is 60-70°C, that of aluminum-based MOF materials is 50-60°C, that of zirconium-based MOF materials is 55-65°C, and that of aminozirconium-based MOF materials is 45-60°C. All of these have relatively low heating and regeneration temperatures, effectively adapting to the heating temperature range of the primary condenser 22.

[0110] Secondly, embodiments of this application provide a control method for a fresh air handling unit, used to control the fresh air handling unit in the first aspect, such as... Figure 5 As shown, the control method includes the following steps S100, S200, S310 and S320.

[0111] Step S100: Control the start-up of the fresh air handling unit.

[0112] Starting the fresh air unit refers to introducing fresh air into the room. This only includes the conventional fresh air mode, which involves starting the supply fan 61 and opening the supply air valve 54 to supplement the room with fresh air. However, during the startup phase, the first evaporator 21, condenser 22, and rotary dehumidifier 30 are all in the off state. That is, the supply fan 61 directly delivers fresh air into the room without adjusting the fresh air temperature. Alternatively, the fresh air can be mixed with indoor return air in the second air duct section 200, and then regulated by the second evaporator 23 before being delivered into the room.

[0113] Step S200: Obtain the indoor target humidity and target temperature, and calculate the preset humidity range based on the target humidity, target temperature and deviation value.

[0114] For example, such as Figure 5 As shown, an absolute humidity parameter (representing the actual water content in a unit volume of air, i.e., the preset humidity content dp) can be calculated from the target (set) humidity (relative humidity) and the target temperature (set temperature). The upper limit (dp+Δd) and lower limit (dp-Δd) of the preset humidity range can be obtained by adding or subtracting the deviation value (Δd) from the absolute humidity parameter. Therefore, the preset humidity range is [dp-Δd, dp+Δd].

[0115] The setting of the deviation value △d can provide a stable target range value to avoid frequent system adjustments and switching.

[0116] Step S310: After a first preset time (i.e., T1, such as 5-600s), collect the first air humidity and the first air temperature on the air outlet side of the dehumidification channel, calculate the first humidity value based on the first air humidity and the first air temperature, and compare the first humidity value with the preset humidity range.

[0117] The first humidity value (i.e., the current fresh air humidity value dc) can be an insulation humidity parameter calculated based on the first air humidity and the first air temperature. The first humidity value refers to the absolute humidity of the fresh air after it flows sequentially through the first evaporator 21 and the dehumidification channel 31, that is, the actual water content per unit volume of air. At this time, since the first evaporator 21 and the rotary dehumidifier 30 are not activated, the first humidity value is equivalent to the humidity value of the outdoor fresh air. The water content of the fresh air does not change when flowing through the dehumidification channel 31, or it decreases slightly without affecting subsequent comparisons.

[0118] Step S320: If the first humidity value is within the preset humidity range, control the fresh air unit to maintain the current operating state, and re-detect and compare after the first preset time.

[0119] Since both the first evaporator and the rotary dehumidifier 30 are in the off state during initial startup, the first humidity value being within the preset humidity range (i.e., dp+△d≥dc≥dp-△d holds true) indicates that the humidity of the fresh air itself is sufficient to meet the user's adjustment needs, and it is only necessary to maintain the current operating state.

[0120] In this way, after the fresh air unit is started, it detects and judges whether the first humidity value is within the preset range based on the initial operating status, and controls the fresh air unit to maintain the current operating status after the requirements are met, so as to meet the efficient and stable operating conditions.

[0121] Simultaneously, after a first preset time period (e.g., 5-600 seconds), the real-time humidity value is re-detected and compared with the preset humidity range to avoid changes in operating parameters caused by environmental changes, system switching, or system failures. This facilitates subsequent real-time adjustment of the fresh air unit's operating status.

[0122] Furthermore, since the control method of the fresh air handling unit is used to control the fresh air handling unit in the first aspect, the control method of the fresh air handling unit has all the effects of the embodiments involving the fresh air handling unit described above, and will not be repeated here.

[0123] In the above control method, the steps of starting the fresh air unit and obtaining the indoor target humidity and target temperature (i.e., steps S100 and S200) can be interchanged.

[0124] However, when comparing the first humidity value with the preset humidity range, the first humidity value may also be outside the preset humidity range. For example... Figure 5 As shown, after step S310, the control method includes the following steps S330, S410, S420, S430, S440, S450 and S460.

[0125] Step S330: If the first humidity value is outside the preset humidity range, control the collection of fresh air temperature and fresh air humidity, calculate the fresh air humidity value based on the fresh air temperature and fresh air humidity, and compare the fresh air humidity value with the upper limit of the preset humidity range.

[0126] The first humidity value being outside the preset humidity range indicates that the first humidity value is greater than the upper limit of the preset humidity range (i.e., the maximum value, such as dc>dp+△d), or the first humidity value is less than the lower limit of the preset humidity range (i.e., the minimum value, such as dc<dp+△d).

[0127] At this point, it is necessary to combine the fresh air temperature and humidity to calculate the fresh air humidity value, and then compare the fresh air humidity value with the preset humidity range to make a comprehensive judgment and adjust the unit's operating conditions based on the comparison results.

[0128] The fresh air temperature and humidity refer to the parameters collected at the location of the first temperature and humidity sensor 72. In the first dehumidification mode and the second dehumidification mode, the fresh air temperature and humidity include the fresh air mixed in through the regeneration channel 32. This portion of fresh air is heated and humidified, resulting in the actual measured fresh air temperature and humidity being higher than the outdoor air temperature and humidity.

[0129] Step S410: If the fresh air humidity value is greater than the preset humidity range (i.e., dx > dp + Δd), control the start of the first evaporator.

[0130] Since the refrigerant circulation system 20 and the rotary dehumidifier 30 were not running after the fresh air unit was started, and based on dx > dp + Δd, the first humidity value detected should be dc > dp + Δd. This indicates that the humidity of the fresh air directed to the second air duct section 200 is relatively high, requiring further processing.

[0131] Therefore, the first dehumidification mode is activated to cool and dehumidify the incoming fresh air through the first evaporator 21, thereby reducing the first air humidity and the first air temperature on the air outlet side of the dehumidification channel 31, that is, reducing the water content per unit volume of air (such as the first humidity value).

[0132] Because the fresh air condenses and condenses moisture in the first evaporator 21, the air flowing out of the dehumidification channel 31 has a low moisture content, so that the first humidity value is within the preset humidity range, so as to supply fresh air that meets the target humidity requirements to the room.

[0133] Step S420: After the second preset time (i.e., T2), obtain the first humidity value of the dehumidification channel on the air outlet side, and compare the first humidity value with the preset humidity range.

[0134] The second preset duration can be 5-600 seconds. This interval allows the fresh air unit to operate stably in the dehumidification state at the first evaporator 21 and dehumidification channel 31, thereby outputting fresh air with a relatively stable humidity content. This facilitates subsequent secondary collection and comparison of the first humidity value.

[0135] Step S430: If the first humidity value is less than or equal to the maximum value of the preset humidity range (i.e., dc≤dp+△d), maintain the operation of the first evaporator.

[0136] This indicates that the current operating state of the first evaporator 21 is sufficient to control the moisture content of the dehumidified fresh air within the preset humidity range. In this case, the current operating state of the first evaporator 21 is maintained to ensure the fresh air unit maintains a stable operating state and avoids frequent start-ups, shutdowns, or frequent adjustments to the operating power.

[0137] Step S440: If the first humidity value is greater than the maximum value of the preset humidity range (i.e., dc > dp + Δd), control the start of the rotary dehumidifier and switch to dehumidification mode.

[0138] However, if the first humidity value detected in the second test is still greater than the maximum value of the preset humidity range, it means that the first evaporator 21 is also insufficient to meet the dehumidification requirements.

[0139] At this time, since the fresh air unit is currently in the first dehumidification mode (i.e., cooling and dehumidification only through the first evaporator 21), the rotary dehumidifier 30 can be started and switched to dehumidification mode, meaning the fresh air system is now in the second dehumidification mode. This achieves a two-stage dehumidification effect through cooling and dehumidification via the first evaporator 21 and adsorption by the rotary core 33 in the dehumidification channel 31, significantly reducing the moisture content of the fresh air flowing out of the dehumidification channel 31.

[0140] It should be noted that the fresh air handling unit provided in this application may also include an outdoor unit and an outdoor condenser. The outdoor condenser and the two ends of the condenser 22 are connected in parallel and equipped with condenser flow valves to regulate and control the refrigerant flow in the outdoor condenser and condenser 22. The outdoor condenser is connected to the refrigerant circulation system 20 in the first dehumidification mode and circulates heat through the outdoor unit to ensure the cooling and dehumidification effect of the first evaporator 21 in the first dehumidification mode. Step S450: After a third preset time (i.e., T3, such as 5-600s), the first humidity value is obtained and compared with the preset humidity range.

[0141] Step S460: If the first humidity value is within the preset humidity range, maintain the current operating status of the fresh air unit.

[0142] The first humidity value obtained at this time is the first humidity value of the third detection.

[0143] In this way, the above steps enable real-time monitoring of the fresh air handling unit's status parameters and flexible adjustment of its operating status. If the first evaporator 21 can meet the dehumidification requirements, it maintains its operation, ensuring a balance between dehumidification efficiency and energy consumption. When the first evaporator 21 alone is insufficient to reduce the humidity to the target range, the system can promptly activate the rotary dehumidifier 30 and switch to the second dehumidification mode, thereby providing greater dehumidification capacity and effectively handling high humidity gradients. This ensures that indoor air humidity remains at a comfortable and healthy level, significantly improving the intelligent control level and environmental adaptability of the fresh air handling unit.

[0144] Continue to refer to Figure 5 In step S330, if the fresh air humidity is less than or equal to the upper limit of the preset humidity range (i.e., dx≤dp+△d), the control method further includes the following steps S500 and S600 after step S330.

[0145] Step S500: After the fourth preset time (i.e., T4, such as 5-600s), the fresh air humidity value is reacquired and compared with the upper limit of the preset humidity range. Step S600: If the fresh air humidity value is less than or equal to the upper limit of the preset humidity range, the rotary dehumidifier is started and the fresh air unit is switched to humidification mode.

[0146] After a second test, it was confirmed that the fresh air humidity value was indeed less than or equal to the upper limit of the preset humidity range, i.e., dx ≤ dp + Δd. At this time, since the moisture content of the fresh air can only remain unchanged or decrease during the process of flowing through the first evaporator 21 and the dehumidification channel 31, the first humidity value on the air outlet side of the dehumidification channel 31 must be less than the lower limit of the preset humidity range (because the first humidity value detected in the first test is outside the preset humidity range), i.e., dc < dp - Δd.

[0147] During this process, if the fresh air unit does not activate the first or second dehumidification mode, the fresh air humidity value (i.e., the outdoor air humidity) will also be lower than the lower limit of the preset humidity range, i.e., a dry outdoor environment (such as a dry winter environment). In this case, indoor humidification is required. Therefore, the rotary dehumidifier 30 is activated, and the fresh air unit is switched to humidification mode, i.e., the refrigerant circulation system 20 is turned on to activate the humidification duct 41 and close the circulation duct 42.

[0148] Furthermore, in step S600, if the fresh air humidity value is greater than the upper limit of the preset humidity range, it indicates that the fresh air humidity being less than or equal to the upper limit of the preset humidity range in step S330 is an occasional detection failure, and then return to and re-execute step S310.

[0149] Correspondingly, in step S450, if the first humidity value detected in the third test is still outside the preset humidity range, it may be due to reasons such as target requirements, changes in the outdoor environment, or occasional detection failures, which may cause the secondary dehumidification mode to still not meet the target requirements. At this time, the system can switch to step S500 to re-collect the temperature and humidity at the first temperature and humidity sensor 72 to obtain the outdoor fresh air humidity value and compare it with the preset temperature range. Based on the actual detection and judgment results, the operating status of the fresh air unit can be readjusted.

[0150] This application embodiment also provides a control module 71, such as Figure 6 As shown, the control module 71 includes a processor 711, a communication interface 712, a memory 713, and a communication bus 714. The processor 711, communication interface 712, and memory 713 communicate with each other via the communication bus 714. The memory 713 is used to store computer programs.

[0151] In one embodiment of this application, when the processor 711 executes the program stored in the memory 713, it implements the control method of the fresh air unit as provided in any of the foregoing method embodiments.

[0152] This application also provides a computer-readable storage medium storing a computer program thereon, which, when executed by a processor, implements the steps of the control method for the fresh air unit provided in any of the foregoing method embodiments.

[0153] It should be understood that the terminology used herein is for the purpose of describing particular exemplary embodiments only and is not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms “a,” “an,” and “described” as used herein may also include the plural forms. The terms “comprising,” “including,” “containing,” and “having” are inclusive and therefore indicate the presence of the stated features, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, steps, operations, elements, components, and / or combinations thereof. The method steps, processes, and operations described herein are not construed as requiring them to be performed in a particular order described or illustrated unless the order of performance is explicitly indicated. It should also be understood that additional or alternative steps may be used.

[0154] Through the above description of the embodiments, those skilled in the art can clearly understand that each embodiment can be implemented by means of software plus a general-purpose hardware platform, and of course, it can also be implemented by hardware. Based on this understanding, the above technical solutions, in essence or the parts that contribute to the related technology, can be embodied in the form of a software product. This computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, magnetic disk, optical disk, etc., including several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute the methods of various embodiments or some parts of embodiments.

[0155] Although terms such as first, second, third, etc., may be used in this document to describe multiple elements, components, regions, layers, and / or segments, these elements, components, regions, layers, and / or segments should not be limited by these terms. These terms may be used only to distinguish one element, component, region, layer, or segment from another. Unless the context clearly indicates otherwise, terms such as "first," "second," and other numerical terms used herein do not imply order or sequence. Therefore, the first element, component, region, layer, or segment discussed below may be referred to as the second element, component, region, layer, or segment without departing from the teachings of the exemplary embodiments.

[0156] The above are merely specific embodiments of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A fresh air handling unit, characterized in that, include: The fresh air inlet (11), the first evaporator (21), and the indoor air outlet (12) are connected in sequence. The rotary dehumidifier (30) includes a dehumidification channel (31) and a regeneration channel (32). The dehumidification channel (31) is connected between the first evaporator (21) and the indoor air outlet (12). The dehumidification channel (31) is used to adsorb moisture in the air flowing through it. The regeneration channel (32) is connected to the fresh air inlet (11) via the condenser (22). The condenser (22) is used to heat the air flowing through the regeneration channel (32) and regenerate the rotary dehumidifier (30). The air outlet of the regeneration channel (32) is connected to the upstream air duct of the first evaporator (21).

2. The fresh air handling unit according to claim 1, characterized in that, The fresh air handling unit includes: Humidifying air duct (41), one end of which is connected to the air outlet side of the regeneration channel (32), and the other end of which is connected to the indoor air outlet (12); And a circulating air duct (42), wherein a regeneration return air inlet (15) is provided at the upstream air duct of the first evaporator (21), and the circulating air duct (42) is connected between the regeneration return air inlet (15) and the regeneration channel (32); The fresh air unit has a humidification mode and a dehumidification mode; in the humidification mode, the humidification duct (41) is configured to be in the open state; in the dehumidification mode, the rotary dehumidifier (30) is started and the circulating duct (42) is configured to be in the open state.

3. The fresh air handling unit according to claim 2, characterized in that, The fresh air unit includes a humidifying air valve (51) and a first return air valve (52); the humidifying air valve (51) is disposed between the regeneration channel (32) and the humidifying air duct (41) and is used to control the opening or closing of the humidifying air duct (41); the first return air valve (52) is connected in series with the circulating air duct (42) and is used to control the opening or closing of the circulating air duct (42); and / or, The fresh air unit includes an outdoor exhaust vent (13) and an exhaust valve (53). The outdoor exhaust vent (13) is located on the air outlet side of the dehumidification channel (31), and the exhaust valve (53) is used to control the opening or closing of the outdoor exhaust vent (13); and / or, The indoor air outlet (12) includes a first air outlet (121) and a second air outlet (122). The first air outlet (121) is connected to the air outlet side of the dehumidification channel (31), and the second air outlet (122) is connected to the humidification air duct (41). At least the first air outlet (121) is provided with an air supply valve (54) for controlling the opening or closing of the first air outlet (121).

4. The fresh air handling unit according to any one of claims 1-3, characterized in that, The fresh air handling unit also includes: The second evaporator (23) is disposed in the air duct between the dehumidification channel (31) and the indoor air outlet (12) to regulate the temperature of the air flowing to the indoor air outlet (12); And a second return air valve (55), a return air port (14) is provided at the air duct between the second evaporator (23) and the dehumidification channel (31), and the second return air valve (55) is provided at the return air port (14) to control the opening or closing of the return air port (14).

5. The fresh air handling unit according to claim 4, characterized in that, The fresh air handling unit includes: The air supply fan (61) extends from the fresh air inlet (11) through the dehumidification channel (31) to the indoor air outlet (12). The air supply fan (61) is located in the duct between the fresh air inlet (11) and the indoor air outlet (12). At least one of a first filter (62), a second filter (63), and a regeneration filter (64); the first filter (62) is connected in series in the upstream duct of the first evaporator (21), the second filter (63) is connected in series in the duct between the second evaporator (23) and the return air inlet (14), and the regeneration filter (64) is connected in series in the upstream duct of the condenser (22).

6. The fresh air handling unit according to claim 4, characterized in that, The fresh air handling unit includes: Control module (71) is used to control the operating status of the first evaporator (21), the condenser (22) and the rotary dehumidifier (30): The first temperature and humidity sensor (72) is located on the air inlet side of the first evaporator (21) and is connected in communication with the control module (71) to detect the fresh air temperature and fresh air humidity. And a second temperature and humidity sensor (73), which is located on the air outlet side of the dehumidification channel (31) and is in communication with the control module (71), is used to detect the first air temperature and the first air humidity flowing through the dehumidification channel (31).

7. The fresh air handling unit according to any one of claims 1-3, characterized in that, The rotary dehumidifier (30) includes a rotary core (33), a motor (34), and a regeneration fan (35). The motor (34) drives the rotary core (33) to rotate and switch between the dehumidification channel (31) and the regeneration channel (32). The regeneration fan (35) is located in the upstream or downstream air duct of the regeneration channel (32); and / or, The fresh air handling unit includes a regeneration air valve (56), which is disposed in the duct between the condenser (22) and the fresh air inlet (11); and / or, The regeneration temperature of the regeneration channel (32) is 45-65℃.

8. A control method for a fresh air handling unit, used to control the fresh air handling unit as described in any one of claims 1-7, characterized in that, The control method includes: Control the start-up of the fresh air handling unit; Obtain indoor target humidity and target temperature, and calculate a preset humidity range based on the target humidity, target temperature and deviation value; After a first preset time period, the first air humidity and the first air temperature on the air outlet side of the dehumidification channel are collected, and a first humidity value is calculated based on the first air humidity and the first air temperature. The first humidity value is then compared with the preset humidity range. If the first humidity value is within the preset humidity range, the fresh air unit is controlled to maintain its current operating state, and the comparison is re-detected after a first preset time.

9. The control method for the fresh air handling unit according to claim 8, characterized in that, After the step of comparing the first humidity value and the preset humidity range, the control method includes: If the first humidity value is outside the preset humidity range, control the collection of fresh air temperature and fresh air humidity, calculate the fresh air humidity value based on the fresh air temperature and fresh air humidity, and compare the fresh air humidity value with the upper limit of the preset humidity range. If the fresh air humidity value is greater than the preset humidity range, control the start of the first evaporator; After a second preset time period, the first humidity value of the dehumidification channel on the air outlet side is obtained, and the first humidity value is compared with the preset humidity range; If the first humidity value is less than or equal to the upper limit of the preset humidity range, the first evaporator remains in operation. If the first humidity value is greater than the lower limit of the preset humidity range, the rotary dehumidifier is activated and switched to dehumidification mode. After a third preset time period, the first humidity value of the dehumidification channel on the air outlet side is obtained, and the first humidity value is compared with the preset humidity range; If the first humidity value is within the preset humidity range, the current operating state of the fresh air unit is maintained.

10. The control method for the fresh air handling unit according to claim 9, characterized in that, After the steps of controlling the acquisition of fresh air temperature and humidity, calculating fresh air humidity value based on the fresh air temperature and humidity, and comparing the fresh air humidity value with the upper limit of the preset humidity range if the first humidity value is outside the preset humidity range, the control method includes: If the fresh air humidity value is less than or equal to the upper limit of the preset humidity range, the fresh air humidity value is re-detected after a fourth preset time period, and the fresh air humidity value is compared with the upper limit of the preset humidity range. If the fresh air humidity value is less than or equal to the upper limit of the preset humidity range, the rotary dehumidifier is activated and the fresh air unit is switched to humidification mode. If the fresh air humidity value is greater than the maximum value of the preset humidity range, after the first preset time period, the first humidity value is re-acquired and compared with the preset humidity range.

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