Fresh air heat exchange unit and control method thereof

Abstract

The application relates to a fresh air heat exchange unit and a control method thereof, and relates to the technical field of indoor air purification, so as to avoid comfort problems caused by excessively low air supply temperature or humidity. The fresh air heat exchange unit comprises a heat exchange assembly, a first fresh air flow channel and a second fresh air flow channel. The heat exchange assembly comprises a first heat exchanger and a second heat exchanger, and the heat exchange temperature of the second heat exchanger is higher than that of the first heat exchanger in the refrigeration or dehumidification mode. The first heat exchanger is arranged in the first fresh air flow channel; and the second heat exchanger is arranged in the second fresh air flow channel. In the first fresh air mode, the first fresh air flow channel is opened to blow out fresh air through the first fresh air flow channel. In the second fresh air mode, at least part of the first fresh air flow channel and the second fresh air flow channel are opened in series to blow out fresh air in sequence after heat exchange through the first heat exchanger and the second heat exchanger. In the third fresh air mode, the second fresh air flow channel is opened to blow out fresh air through the second fresh air flow channel.

Description

Technical Field

[0001] This application relates to the field of indoor air purification technology, and in particular to a fresh air heat exchange unit and its control method. Background Technology

[0002] With increasingly stringent requirements for indoor air quality, fresh air systems have become an essential feature of modern buildings. Traditional fresh air equipment generally uses a single sensible heat or total heat exchange core combined with a single-stage surface cooler structure, and through a temperature threshold switching mechanism, it cannot achieve independent and precise adjustment of temperature and humidity.

[0003] In the hot and humid conditions of summer, the system must start the low-temperature surface cooler for deep dehumidification, which causes the supply air temperature to be much lower than the human comfort range, resulting in a strong feeling of cold air and joint discomfort. Summary of the Invention

[0004] This application provides a fresh air heat exchange unit and its control method to avoid comfort problems caused by excessively low supply air temperature or humidity.

[0005] In a first aspect, embodiments of this application provide a fresh air heat exchange unit, including a heat exchange component, a first fresh air flow channel, and a second fresh air flow channel. The heat exchange component includes a first heat exchanger and a second heat exchanger. In cooling or dehumidification mode, the heat exchange temperature of the second heat exchanger is higher than that of the first heat exchanger. The first heat exchanger is disposed within the first fresh air flow channel; the second heat exchanger is disposed within the second fresh air flow channel. In a first fresh air mode, the first fresh air flow channel is opened to allow fresh air to be blown out through the first fresh air flow channel. In a second fresh air mode, at least a portion of the first and second fresh air flow channels are opened in series to allow fresh air to be blown out after sequentially exchanging heat with the first and second heat exchangers. In a third fresh air mode, the second fresh air flow channel is opened to allow fresh air to be blown out through the second fresh air flow channel.

[0006] In some implementations, the fresh air heat exchanger unit includes: The first air valve, the first heat exchanger, and the first air valve are installed sequentially at the upstream and downstream ends of the first fresh air flow channel; The second air valve is located at the ventilation opening between the first fresh air duct and the second fresh air duct. The third and fourth air valves are installed sequentially at the upstream and downstream ends of the second fresh air duct. In the second fresh air duct, the second heat exchanger is installed between the vent and the fourth air valve.

[0007] In some implementations, the fresh air heat exchanger unit is configured as follows: In the first fresh air mode, the second air valve is closed, at least one of the third and fourth air valves is closed, and the first air valve is opened to open the first fresh air flow channel; In the second fresh air mode, the first and third air valves are closed, and the second and fourth air valves are opened, so that the fresh air is blown out after being heated by the first and second heat exchangers in sequence. In the third fresh air mode, the first air valve is closed, and the third and fourth air valves are opened to open the second fresh air flow channel.

[0008] In some implementations, the heat exchange assembly includes: A variable frequency pump, connected in series with the first heat exchanger, is used to regulate the coolant flow rate of the first heat exchanger; An opening valve is connected in series with the second heat exchanger to form a heat exchange branch, which is connected in series with the first heat exchanger. And a bypass branch, which is connected in series with the first heat exchanger and connected in parallel with the heat exchange branch.

[0009] The heat exchange components are configured as follows: In the first fresh air mode, the first heat exchanger is connected to the bypass branch, and the opening valve is closed; In the second fresh air mode, the opening valve opens to connect the first and second heat exchangers; In the third fresh air mode, the opening valve is opened to connect the first heat exchanger and the second heat exchanger, and the coolant flow rate of the second heat exchanger in the third fresh air mode is lower than that in the second fresh air mode.

[0010] In some implementations, the opening degree of the valve in the third fresh air mode is lower than that in the second fresh air mode.

[0011] In some implementations, the variable frequency pump operates at a lower frequency in the third fresh air mode than in the second fresh air mode.

[0012] In some implementations, the fresh air heat exchanger unit includes: The heat exchange core is used for heat exchange between fresh air and return air. The first and second fresh air channels are located downstream of the heat exchange core. And a third fresh air duct, which is located downstream of the heat exchange core; When the fresh air heat exchanger is in the fourth fresh air mode, the third fresh air duct is opened so that fresh air is blown out through the third fresh air duct.

[0013] In some implementations, the fresh air heat exchanger unit includes: The fifth air valve is installed in the third fresh air duct and is configured as follows: In the fourth fresh air mode, the fifth air valve opens to open the third fresh air duct; In the first, second, and third fresh air modes, the fifth air valve is closed to shut off the third fresh air duct.

[0014] In some implementations, the fresh air heat exchanger unit includes: Particulate matter sensor, used to detect outdoor particulate matter concentration parameters; The first temperature and humidity sensor is used to detect outdoor temperature and humidity parameters. The second temperature and humidity sensor is located between the heat exchange core and the first fresh air flow channel to detect the fresh air temperature and humidity parameters. The third temperature and humidity sensor is installed at the fresh air outlet to detect the outlet air temperature and humidity parameters. Carbon dioxide concentration sensor, used to detect indoor carbon dioxide concentration parameters; The system includes a control module, a particulate matter sensor, a first temperature and humidity sensor, a second temperature and humidity sensor, a third temperature and humidity sensor, and a carbon dioxide concentration sensor, used to acquire outdoor particulate matter concentration parameters, outdoor temperature parameters, outdoor humidity parameters, fresh air temperature parameters, fresh air humidity parameters, outlet air temperature parameters, outlet air humidity parameters, and indoor carbon dioxide concentration parameters; and the control module is configured to control the operating status of the fresh air heat exchanger unit.

[0015] In a second aspect, embodiments of this application provide a control method for a fresh air heat exchanger unit, characterized in that it is used to control the fresh air heat exchanger unit in the first aspect, and the control method includes: Start the fresh air heat exchange unit; Obtain the fresh air temperature and humidity parameters and calculate the fresh air humidity content; If the humidity of the fresh air is not higher than the first preset value, and the difference between the fresh air temperature parameter and the first preset temperature is not lower than the second preset value, then control the fresh air heat exchange unit to switch to the third fresh air mode. If the humidity of the fresh air is higher than the first preset value and the temperature parameter of the fresh air is greater than the second preset temperature, then control the fresh air heat exchange unit to switch to the first fresh air mode. If the humidity of the fresh air is higher than the first preset value, and the fresh air temperature parameter is less than or equal to the second preset temperature, then the fresh air heat exchanger unit is controlled to switch to the second fresh air mode.

[0016] In some embodiments, the fresh air heat exchanger unit includes a fourth fresh air mode, in which the third fresh air duct is opened to allow fresh air to be blown out through the third fresh air duct; in the first or third fresh air mode, the control method includes: Obtain supply air temperature and humidity parameters; If the supply air temperature parameter is lower than the third preset temperature or the supply air humidity parameter is lower than the first preset humidity, the fresh air heat exchanger unit will be switched to the fourth fresh air mode. If the air supply temperature parameter is between the third preset temperature and the first preset temperature, then the flow rate of the coolant in the first heat exchanger is reduced. If the supply air temperature parameter is between the third preset temperature and the first preset temperature, and the supply air humidity is between the first preset humidity and the second preset humidity, then the flow rate of the coolant in the first heat exchanger is controlled to be reduced to the minimum threshold.

[0017] In some implementations, the fresh air heat exchanger unit includes a fourth fresh air mode in which the third fresh air duct is opened to allow fresh air to be blown out through the third fresh air duct; In the second fresh air mode, the control methods include: Obtain supply air temperature and humidity parameters; If the fresh air temperature parameter is less than the fourth preset temperature and the supply air temperature parameter is less than the first preset temperature, then the flow rate of the coolant in the second heat exchanger will be reduced. If the fresh air temperature parameter is between the fourth preset temperature and the second preset temperature, and the supply air temperature parameter is less than the first preset temperature, then the flow rate of the coolant in the second heat exchanger will be increased. If the supply air temperature parameter is lower than the first preset temperature and the supply air humidity parameter is lower than the first preset humidity, then control the fresh air heat exchanger unit to switch to the fourth fresh air mode. If the supply air temperature parameter is less than the first preset temperature and the supply air humidity parameter is between the first preset humidity and the second preset humidity, then the flow rate of the coolant in the first heat exchanger is reduced to the minimum threshold.

[0018] The technical solutions provided in this application have the following advantages compared with the prior art: In the first fresh air mode, the first fresh air duct opens to allow fresh air to be blown out through it; that is, fresh air is guided into the first fresh air duct. A simple mechanical baffle or airflow guiding device can be used to ensure that the fresh air flows only through the first fresh air duct and exchanges heat with the first heat exchanger. For example, a movable baffle can be installed that, when in a specific position, only allows airflow into the first fresh air duct.

[0019] In the second fresh air mode, at least a portion of the first and second fresh air ducts are activated in series. This guides fresh air sequentially through the first and second fresh air ducts. This can be achieved by establishing a connecting channel between the ducts and controlling the airflow direction. For example, a switching mechanism can be used to force the fresh air, after leaving the first fresh air duct via the first heat exchanger, into the second fresh air duct and through the second heat exchanger, thereby exchanging heat with both heat exchangers sequentially before being blown out through the fresh air outlet.

[0020] In the third fresh air mode, the second fresh air duct opens to allow fresh air to be blown out through it; that is, fresh air is guided into the second fresh air duct. This can be achieved using an airflow guiding device similar to that in the first fresh air mode, but in this case, only the airflow is allowed to enter the second fresh air duct and exchange heat with the second heat exchanger. For example, a movable baffle can be installed so that when the baffle is in a specific position, only the airflow is allowed to enter the second fresh air duct.

[0021] By configuring a first and second heat exchanger with different heat exchange temperatures, and combining a first, second, and third fresh air mode, precise heat and humidity treatment of fresh air is achieved. In this way, the unit can selectively perform deep dehumidification and cooling, gentle cooling, or reheat compensation according to actual needs, effectively avoiding the problems of excessive cold, excessive dryness, or discomfort caused by traditional fresh air units under high temperature and high humidity or low temperature and low humidity conditions. Through multi-mode switching, the unit's adaptability to different environmental conditions is improved, enhancing indoor thermal comfort. Attached Figure Description

[0022] 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.

[0023] 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.

[0024] 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.

[0025] Figure 1 This is a three-dimensional structural diagram of a fresh air heat exchanger unit provided in an embodiment of this application; Figure 2 for Figure 1 The diagram shows a three-dimensional structure of the fresh air heat exchanger unit from another angle. Figure 3 for Figure 1 A schematic diagram showing the flow direction of return air in the fresh air heat exchanger unit. Figure 4 for Figure 1 The diagram shows the airflow direction of the fresh air heat exchanger unit in the first fresh air mode. Figure 5 for Figure 1The diagram shows the airflow direction of the fresh air heat exchanger unit in the second fresh air mode. Figure 6 for Figure 1 The diagram shows the airflow direction of the fresh air heat exchanger unit in the third fresh air mode. Figure 7 for Figure 1 The diagram shows the airflow direction of the fresh air heat exchanger unit in the fourth fresh air mode. Figure 8 This is a schematic diagram of the connection structure of a heat exchange component provided in an embodiment of this application; Figure 9 An electrical connection diagram of a control module provided in an embodiment of this application; Figure 10 A flowchart illustrating a control method for a fresh air heat exchanger unit provided in this application embodiment; Figure 11 This is a schematic diagram of the communication connection of a control module provided in an embodiment of this application.

[0026] Icon labels: 100. Casing; 110. First fresh air duct; 120. Second fresh air duct; 130. Third fresh air duct; 141. First air valve; 142. Second air valve; 143. Third air valve; 144. Fourth air valve; 145. Fifth air valve; 150. Heat exchanger core; 161. Fresh air inlet; 162. Fresh air outlet; 163. Return air inlet; 164. Return air outlet; 165. Ventilation opening; 171. Fresh air fan; 172. Return air fan; 200. Heat exchanger Components; 210, First heat exchanger; 220, Second heat exchanger; 230, Variable frequency pump; 240, Opening valve; 250, Bypass branch; 251, Switching valve; 310, First temperature and humidity sensor; 320, Second temperature and humidity sensor; 330, Third temperature and humidity sensor; 340, Particulate matter sensor; 350, Carbon dioxide concentration sensor; 360, Control module; 361, Processor; 362, Communication interface; 363, Memory; 364, Communication bus. Detailed Implementation

[0027] 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.

[0028] 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.

[0029] 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.

[0030] Based on this, please refer to Figures 1 to 11 This application provides a fresh air heat exchange unit and its control method to avoid comfort problems caused by excessively low supply air temperature or humidity.

[0031] Firstly, this application provides a fresh air heat exchange unit, such as Figure 1 and Figure 2 As shown, the fresh air heat exchange unit includes a first fresh air flow channel 110, a second fresh air flow channel 120, and a heat exchange component.

[0032] For example, such as Figure 1 As shown, the fresh air heat exchanger unit includes a casing 100, a first fresh air flow channel 110 and a second fresh air flow channel 120 disposed within the casing, and a fresh air outlet 162 communicating with both. This allows fresh air or return air to flow into the room through the first fresh air flow channel 110 and the second fresh air flow channel 120 and the fresh air outlet 162, thereby improving indoor air quality.

[0033] like Figure 1 and Figure 2As shown, the heat exchange assembly 200 includes a first heat exchanger 210 and a second heat exchanger 220. In cooling or dehumidification mode, the heat exchange temperature of the second heat exchanger 220 is higher than that of the first heat exchanger 210.

[0034] In cooling or dehumidification mode, the heat exchange temperature of the second heat exchanger 220 is higher than that of the first heat exchanger 210, allowing it to function as a reheating or gentle cooling unit after the first heat exchanger 210. That is, the first heat exchanger 210 is a low-temperature heat exchanger, with its heat exchange temperature set at approximately 8-9℃ (i.e., cryogenic temperature), such as 7℃. The first heat exchanger 210 is primarily used for deep cooling and dehumidification of fresh air to cope with high-temperature and high-humidity outdoor environments.

[0035] The second heat exchanger 220 is a medium-temperature heat exchanger, with its heat exchange temperature set at approximately 11-13℃ (i.e., medium-cooling temperature). For example, the heat exchange temperature of the second heat exchanger 220 can be set to 12℃. The second heat exchanger 220 can be used to gently cool or reheat fresh air to regulate the supply air temperature to a comfortable range for the human body, avoiding excessive cooling or dryness.

[0036] like Figure 1 and Figure 2 As shown, the first heat exchanger 210 is disposed within the first fresh air flow channel 110, meaning the first fresh air flow channel 110 is configured to accommodate the first heat exchanger 210, allowing sufficient heat and moisture exchange between the fresh air and the first heat exchanger 210 as the fresh air passes through the flow channel. The second heat exchanger 220 is disposed within the second fresh air flow channel 120. The second fresh air flow channel 120 is configured to accommodate the second heat exchanger 220, allowing heat and moisture exchange between the fresh air and the second heat exchanger 220 as the fresh air passes through the flow channel. These flow channels can be physically isolated using baffles or independent ducts to ensure the independence of the airflow path.

[0037] The operating mode of the fresh air heat exchanger unit can be configured through the control system. For example, different control logics or operating procedures can be set to allow the unit to switch to a preset operating mode under specific conditions. These mode switching can be triggered based on external environmental parameters, indoor air quality parameters, or user settings. For instance, the fresh air heat exchanger unit can be configured to have a first fresh air mode, a second fresh air mode, and a third fresh air mode.

[0038] In the first fresh air mode, the first fresh air duct 110 is opened to allow fresh air to be blown out through it, meaning the fresh air is guided into the first fresh air duct 110. A simple mechanical baffle or airflow guiding device can be used to ensure that the fresh air flows only through the first fresh air duct 110 and exchanges heat with the first heat exchanger 210. For example, a movable baffle can be provided that, when in a specific position, only allows airflow into the first fresh air duct 110.

[0039] In the second fresh air mode, at least a portion of the first fresh air duct 110 and the second fresh air duct 120 are activated in series. This allows fresh air to be guided sequentially through the first fresh air duct 110 and the second fresh air duct 120. This can be achieved by setting a connecting channel between the ducts and controlling the airflow direction. For example, a switching mechanism can be provided so that after the fresh air leaves the first fresh air duct 110 via the first heat exchanger 210, it is forced into the second fresh air duct 120 and flows through the second heat exchanger 220, thereby exchanging heat with the first heat exchanger 210 and the second heat exchanger 220 sequentially before being blown out through the fresh air outlet 162.

[0040] In the third fresh air mode, the second fresh air duct 120 is opened to allow fresh air to be blown out through it, meaning the fresh air is guided into the second fresh air duct 120. This can be achieved using an airflow guiding device similar to that in the first fresh air mode, but in this case, only the airflow is allowed to enter the second fresh air duct 120 and exchange heat with the second heat exchanger 220. For example, a movable baffle can be provided, which, when in a specific position, only allows airflow into the second fresh air duct 120.

[0041] By configuring a first heat exchanger 210 and a second heat exchanger 220 with different heat exchange temperatures, and combining a first fresh air mode, a second fresh air mode, and a third fresh air mode, refined heat and humidity treatment of fresh air is achieved. In this way, the unit can selectively perform deep dehumidification and cooling, gentle cooling, or reheat compensation according to actual needs, effectively avoiding the problems of excessive cold, excessive dryness, or discomfort caused by traditional fresh air units under high temperature and high humidity or low temperature and low humidity conditions. Through multi-mode switching, the unit's adaptability to different environmental conditions is improved, enhancing indoor thermal comfort.

[0042] Among them, such as Figure 1 and Figure 2 As shown, the fresh air heat exchange unit includes a heat exchange core 150, which is disposed within the casing 100. (Refer to...) Figure 3 In fresh air mode, indoor return air is sequentially discharged to the outside through return air inlet 163, heat exchange core 150, return air fan 172, and return air outlet 164. (Refer to...) Figure 4In the first fresh air mode, outdoor fresh air is sequentially blown into the room through the fresh air inlet 161, heat exchange core 150, fresh air fan 171, first fresh air duct 110, and fresh air outlet 162. The fresh air and return air exchange heat within the heat exchange core 150, allowing the return air to pre-cool or preheat the fresh air within the heat exchange core 150, thereby preventing the loss of indoor cool or heat and improving the overall energy efficiency ratio.

[0043] In some implementations, such as Figure 1 and Figure 2 As shown, the fresh air heat exchange unit includes a first air valve 141, a second air valve 142, a third air valve 143, and a fourth air valve 144. The first heat exchanger 210 and the first air valve 141 are respectively installed at the upstream and downstream ends of the first fresh air flow channel 110.

[0044] The first air valve 141 is used to control the entry and exit of fresh air into the first fresh air flow channel 110. It can take various forms, such as an electric, pneumatic, or manual valve, to open or close the airflow. By placing the first air valve 141 downstream of the first fresh air flow channel 110, the flow channel can be effectively isolated or opened, ensuring that fresh air can accurately enter or leave the first fresh air flow channel 110 under different operating modes.

[0045] like Figure 2 As shown, a vent 165 is provided between the first fresh air flow channel 110 and the second fresh air flow channel 120. A second air valve 142 is located at the vent 165 to control the flow of fresh air between the two channels. When fresh air needs to flow sequentially through the first heat exchanger 210 and the second heat exchanger 220, the second air valve 142 opens to guide the airflow from the first fresh air flow channel 110 into the second fresh air flow channel 120, and then sequentially through the first heat exchanger 210 and the second heat exchanger 220. The second air valve 142 can also be controlled electrically, pneumatically, or manually to achieve precise airflow guidance.

[0046] Reference Figure 1 The third air valve 143 and the fourth air valve 144 are respectively installed at the upstream and downstream ends of the second fresh air flow channel 120. In the second fresh air flow channel 120, the second heat exchanger 220 is installed between the vent 165 and the fourth air valve 144. Similar to the first air valve 141, the third air valve 143 and the fourth air valve 144 ensure the independent operation of the second fresh air flow channel 120 or its coordinated operation with other flow channels by opening or closing. For example, in the mode where only the second fresh air flow channel 120 needs to be open, the opening of the third air valve 143 and the fourth air valve 144 ensures the smooth passage of fresh air.

[0047] In the second fresh air duct 120, the second heat exchanger 220 is installed between the vent 165 and the fourth air valve 144. This installation position ensures that when fresh air enters the second fresh air duct 120 from the first fresh air duct 110 through the vent 165, it can first undergo heat exchange through the second heat exchanger 220, and then be discharged through the fourth air valve 144, thus ensuring the sequentiality of airflow and the effectiveness of heat exchange.

[0048] By properly configuring the opening and closing states of the first air valve 141, the second air valve 142, the third air valve 143, and the fourth air valve 144, the flow path of fresh air in different operating modes can be clearly defined.

[0049] For example, in the first fresh air mode, refer to Figure 4 Only the first air valve 141 is opened. The second air valve 142 is closed, and at least one of the third air valve 143 and the fourth air valve 144 is closed. This allows the first fresh air passage 110 to be open, while the second fresh air passage 120 is closed. Fresh air can then be directly blown out through the first fresh air passage 110, avoiding unnecessary heat exchange or flow resistance.

[0050] In the second fresh air mode, refer to Figure 5 By coordinating the opening of the second air valve 142 and the fourth air valve 144, and closing other related air valves, fresh air can pass through the first heat exchanger 210 and the second heat exchanger 220 in series for heat exchange, and then be blown out into the room, thereby achieving two-stage heat exchange to avoid excessive low temperature or low humidity affecting the experience.

[0051] In the third fresh air mode, refer to Figure 6 By opening the third air valve 143 and the fourth air valve 144, the second fresh air flow channel 120 is opened, and fresh air can directly exchange heat through the second fresh air flow channel 120. At this time, at least the first air valve 141 is closed to seal the first fresh air flow channel 110.

[0052] This refined control based on air valves not only avoids airflow short-circuiting or mixing, ensuring the accuracy of the fresh air path in each mode, but also significantly improves the flexibility and energy efficiency of the fresh air heat exchange unit in different operating modes, enabling it to provide customized fresh air treatment solutions according to actual needs, thereby optimizing user experience and system operating economy.

[0053] In some implementers, such as Figure 2 and Figure 8As shown, the heat exchange assembly 200 includes a variable frequency pump 230, an opening valve 240, and a bypass branch 250. The variable frequency pump 230 is connected in series with the first heat exchanger 210 and can be installed upstream or downstream of the first heat exchanger 210 to regulate the coolant flow rate of the first heat exchanger 210. The variable frequency pump 230 is a pump whose speed is adjusted by changing the frequency of the motor power supply. It can adjust the output frequency in real time according to the control signal, thereby precisely controlling the pump's flow rate and head. By controlling the operating frequency of the variable frequency pump 230, stepless or multi-stage regulation of the coolant flow rate can be achieved. For example, when it is necessary to reduce the cooling capacity of the first heat exchanger 210, its operating frequency can be reduced, decreasing the amount of coolant circulating. Conversely, the operating frequency can be increased.

[0054] The opening valve 240 is connected in series with the second heat exchanger 220 to form a heat exchange branch, which is then connected in series with the first heat exchanger 210 (and the variable frequency pump 230). The opening valve 240 is a valve capable of controlling fluid flow by adjusting its opening degree, which can be continuously or progressively adjusted from fully closed to fully open. In this application, the function of the opening valve 240 is to precisely control the flow rate of coolant through the second heat exchanger 220. By adjusting the opening degree of the opening valve 240, the amount of coolant entering the second heat exchanger 220 can be directly limited or increased.

[0055] It should be noted that in the second and third fresh air modes, the opening valve 240 has a minimum opening threshold, such as 10-25%, to ensure that there is flowing coolant in the second heat exchanger 220.

[0056] like Figure 8 As shown, the bypass branch 250 is equipped with a switching valve 251 for controlling the opening and closing states of the bypass branch 250. The bypass branch 250 is connected in series with the first heat exchanger 210 (and the variable frequency pump 230), and is also connected in parallel with the heat exchange branch. In this application, the function of the bypass branch 250 is to provide an alternative path, allowing some of the coolant to return directly without passing through the second heat exchanger 220, so that the first heat exchanger 210 in the first fresh air mode can have the coolant flow rapidly through the bypass branch 250, thereby ensuring a lower heat exchange temperature at the first heat exchanger 210.

[0057] When the bypass branch 250 and the second heat exchanger 220 are connected in parallel and open, the flow distribution of coolant in the two branches can be adjusted by regulating the opening of the opening valve 240. Alternatively, a switching valve 251 with an opening adjustment function can also be configured. The coolant flow rate in the first heat exchanger 210 is typically adjusted by regulating the speed or frequency of the variable frequency pump 230.

[0058] Based on this, such as Figure 8 As shown, the heat exchange component 200 is configured as follows: In the first fresh air mode, the first heat exchanger 210 is connected to the bypass branch 250, and the opening valve 240 is closed (i.e., the switching valve 251 is open). At this time, the coolant flow rate in the first heat exchanger 210 is adjusted by adjusting the speed or frequency of the variable frequency pump 230 to maintain the first heat exchanger 210 within the cryogenic temperature range.

[0059] In the second fresh air mode, the opening valve 240 opens to connect the first heat exchanger 210 and the second heat exchanger 220. At this time, the bypass branch 250 can be selectively opened or closed as needed. Alternatively, when the bypass branch 250 is open, the opening degree of the opening valve 240 can be adjusted accordingly to control the coolant distribution ratio in the second heat exchanger 220. This ensures that the first heat exchanger 210 maintains a cryogenic temperature range, and the second heat exchanger 220 maintains a mesocool temperature range.

[0060] In the third fresh air mode, the opening valve 240 is opened to connect the first heat exchanger 210 and the second heat exchanger 220, and the coolant flow rate of the second heat exchanger 220 in the third fresh air mode is lower than that in the second fresh air mode. At this time, the bypass branch 250 is normally open to divert coolant so that the second heat exchanger 220 is kept within the heat exchange range of the intermediate cooling temperature.

[0061] The variable frequency pump 230 can adjust the overall coolant flow rate of the first heat exchanger 210 according to system requirements, while the cooperation between the opening valve 240 and the bypass branch 250 provides a more flexible and precise flow distribution mechanism. This ensures that the first heat exchanger 210 maintains a deep-cooling temperature range in both the first and second fresh air modes, while the second heat exchanger 220 maintains a medium-cooling temperature range in both the second and third fresh air modes. This allows the fresh air heat exchange unit to intelligently adjust its cooling output according to actual environmental conditions and user needs in different operating modes, significantly improving the system's energy efficiency ratio and operational flexibility while ensuring the comfort of the fresh air.

[0062] For example, when the bypass branch 250 is open, the opening degree of the opening valve 240 in the third fresh air mode is lower than that in the second fresh air mode. This results in the second heat exchanger 220 having a lower coolant flow rate in the third fresh air mode compared to the second fresh air mode.

[0063] This is because in the third fresh air mode, since the first heat exchanger 210 is not connected to the heat exchange airflow, meaning the coolant flowing through the first heat exchanger 210 does not experience heat exchange and temperature rise, if the second heat exchanger 220 is to stably maintain the intercooling temperature range in the third fresh air mode, the flow rate of the coolant in the second heat exchanger 220 must be reduced. At this time, other coolant flows back through the bypass branch 250 and does not participate in the heat exchange at the second heat exchanger 220.

[0064] Alternatively, the operating frequency of the variable frequency pump 230 in the third fresh air mode can be set to be lower than that in the second fresh air mode, which can also reduce the flow rate of the coolant in the second heat exchanger 220.

[0065] In some implementations, such as Figure 2 and Figure 7 As shown, the fresh air heat exchanger unit includes a heat exchange core 150 and a third fresh air flow channel 130. Fresh air and return air exchange heat within the heat exchange core 150. A first fresh air flow channel 110 and a second fresh air flow channel 120 are located downstream of the heat exchange core 150. The third fresh air flow channel 130 is also located downstream of the heat exchange core 150. When the fresh air heat exchanger unit is in a fourth fresh air mode, the third fresh air flow channel 130 is opened to allow fresh air to be blown out through it.

[0066] When introducing fresh air, the fresh air heat exchanger unit can first pre-treat the air through the heat exchange core 150 to achieve energy recovery between the fresh air and the return air, thereby reducing the load on subsequent processing. Based on this, by adding a third fresh air duct 130 and introducing a fourth fresh air mode, the unit can avoid the additional energy consumption caused by turning on the first heat exchanger 210 and the second heat exchanger 220 when outdoor air conditions are suitable or only basic ventilation is required.

[0067] For example, in spring and autumn, when outdoor temperature and humidity are within a comfortable range, the unit can switch to the fourth fresh air mode. After energy recovery through the heat exchange core 150, the fresh air is directly delivered into the room through the third fresh air duct 130, eliminating the need to activate the first heat exchanger 210 or the second heat exchanger 220 for heating or cooling, thus significantly reducing operating costs. This design provides the fresh air heat exchange unit with a more flexible operating strategy, enabling it to select the most suitable ventilation method according to different environmental needs and energy-saving goals, improving the unit's adaptability and energy efficiency.

[0068] In some implementations, such as Figure 1 and Figure 7 As shown, the fresh air heat exchanger unit includes a fifth air valve 145. The third fresh air duct 130 is equipped with the fifth air valve 145 and is configured such that: in the fourth fresh air mode, the fifth air valve 145 opens to open the third fresh air duct 130; in the first, second, and third fresh air modes, the fifth air valve 145 closes to close the third fresh air duct 130.

[0069] In the fourth fresh air mode, both the first fresh air duct 110 and the second fresh air duct are closed, and at least the variable frequency pump 230 is also closed.

[0070] Through the above technical solution, the fresh air heat exchanger unit can achieve precise and on-demand control of the third fresh air flow channel 130. In the fourth fresh air mode, the opening of the fifth air valve 145 ensures that fresh air can be smoothly blown out through the third fresh air flow channel 130, thereby fully utilizing the specific function of the mode. In the first, second, and third fresh air modes, the closing of the fifth air valve 145 effectively blocks the flow of fresh air through the third fresh air flow channel 130. This ensures the dehumidification and heat exchange effects of fresh air in other fresh air modes, thereby improving the operational stability and control precision of the entire fresh air heat exchanger unit. This allows the fresh air heat exchanger unit to manage the fresh air path more flexibly and efficiently when switching between multiple modes, optimizing user experience and system energy efficiency.

[0071] For example, such as Figure 2 and Figure 9 As shown, the fresh air heat exchange unit includes a particulate matter sensor 340, a first temperature and humidity sensor 310, a second temperature and humidity sensor 320, a third temperature and humidity sensor 330, a carbon dioxide concentration sensor 350, and a control module 360.

[0072] The particulate matter sensor 340 can be installed at the fresh air inlet to detect outdoor particulate matter concentration. The first temperature and humidity sensor 310 can be installed at the fresh air inlet to detect outdoor temperature and humidity. The second temperature and humidity sensor 320 can be installed between the heat exchange core 150 and the first fresh air duct 110 to detect fresh air temperature (T0) and humidity (RH0). The third temperature and humidity sensor 330 can be installed at the fresh air outlet to detect outlet air temperature and humidity. The carbon dioxide concentration sensor 350 can be installed indoors to detect indoor carbon dioxide concentration (B1).

[0073] Reference Figure 9 The control module 360, together with the particulate matter sensor 340, the first temperature and humidity sensor 310, the second temperature and humidity sensor 320, the third temperature and humidity sensor 330, and the carbon dioxide concentration sensor 350, is used to acquire outdoor particulate matter concentration parameters, outdoor temperature parameters, outdoor humidity parameters, fresh air temperature parameter T0, fresh air humidity parameter RH0, outlet air temperature parameter, outlet air humidity parameter, and indoor carbon dioxide concentration parameter B1. The control module 360 ​​is configured to control the operating status of the fresh air heat exchanger unit.

[0074] By introducing a particulate matter sensor 340, a first temperature and humidity sensor 310, a second temperature and humidity sensor 320, a third temperature and humidity sensor 330, and a carbon dioxide concentration sensor 350, and configuring a control module 360, this application can acquire outdoor particulate matter concentration parameters, outdoor temperature parameters, outdoor humidity parameters, fresh air temperature parameter T0, fresh air humidity parameter RH0, outlet air temperature parameters, outlet air humidity parameters, and indoor carbon dioxide concentration parameter B1 in real time. Therefore, based on this comprehensive environmental data and operational feedback, the control module 360 ​​can intelligently determine the current indoor and outdoor air quality and heat and humidity load conditions, thereby accurately controlling the operating status of the fresh air heat exchanger unit.

[0075] For example, refer to Figure 9 The control module 360 ​​is electrically connected to the variable frequency pump 230, opening valve 240, switching valve 251, fresh air fan 171, return air fan 172, first air valve 141, second air valve 142, third air valve 143, fourth air valve 144, and fifth air valve 145. The control module 360 ​​can determine whether to activate the fresh air mode based on the indoor carbon dioxide concentration and outdoor particulate matter concentration. It dynamically selects the most suitable fresh air mode (such as the first, second, third, or fourth fresh air mode) based on the temperature and humidity of the fresh air after passing through the heat exchange core 150 and the final outlet air temperature and humidity. It also precisely controls and adjusts the air valve opening, heat exchanger, and coolant flow rate. This effectively solves the problem of blind operation caused by the lack of real-time data in traditional units, significantly improving the accuracy, energy efficiency ratio, and user comfort of fresh air treatment, ensuring high-quality indoor air is provided under different environmental conditions.

[0076] It should be noted that, in this embodiment, the first air valve 141, second air valve 142, third air valve 143, fourth air valve 144, and fifth air valve 145 can be installed in a rotating manner. For example, the rotation angle of the air valve plate can be controlled by a rotary motor, stepper motor, or servo motor to control the opening and closing states of the corresponding air valve components. Alternatively, the air valve structure can be a sliding structure, that is, the air valve plate can be moved in a linear direction by a linear motor, rotary motor-lead screw, or cylinder to open or close the corresponding air outlet. In this case, the control module 360 ​​is electrically connected to the motor or valve component (such as a cylinder) corresponding to the air valve structure.

[0077] Secondly, this application provides a control method for a fresh air heat exchanger unit, used to control the fresh air heat exchanger unit in the first aspect, such as... Figure 10 As shown, the control method includes: Start the fresh air heat exchange unit.

[0078] Obtain the fresh air temperature parameter T0 and the fresh air humidity parameter RH0, and calculate the fresh air moisture content P0.

[0079] If the moisture content P0 of the fresh air is not higher than the first preset value K1, and the difference between the fresh air temperature parameter T0 and the first preset temperature T1 is not lower than the second preset value K2, then the fresh air heat exchange unit is controlled to switch to the third fresh air mode.

[0080] If the moisture content P0 of the fresh air is not higher than the first preset value K1, and the difference (absolute value) between the fresh air temperature and the first preset temperature T1 is lower than the second preset value K2, then the fresh air heat exchanger unit is controlled to switch to the fourth fresh air mode.

[0081] If the moisture content P0 of the fresh air is higher than the first preset value K1, and the fresh air temperature parameter T0 is greater than the second preset temperature T2, then the fresh air heat exchanger unit is controlled to switch to the first fresh air mode.

[0082] If the moisture content of the fresh air P0 is higher than the first preset value K1, and the fresh air temperature parameter T0 is less than or equal to the second preset temperature T2, then the fresh air heat exchanger unit is controlled to switch to the second fresh air mode.

[0083] Through the above technical solution, this application provides an intelligent control method for fresh air heat exchanger units, which can automatically and accurately select the most suitable operating mode based on real-time fresh air temperature, humidity, moisture content, and indoor and outdoor air quality parameters. This significantly improves the operating efficiency and user experience of the fresh air heat exchanger unit.

[0084] For example, when the humidity P0 of the fresh air is low and the temperature is suitable, the system can intelligently switch to the fourth fresh air mode, which only performs ventilation and avoids unnecessary cooling and heating load processing, thereby significantly reducing energy consumption.

[0085] When the fresh air is humid and warm, the system can automatically select the first or second fresh air mode to make full use of the cooling and dehumidification capacity of the heat exchange component 200 to ensure the comfort of the indoor environment.

[0086] Furthermore, since the control method for the fresh air heat exchanger unit is used to control the fresh air heat exchanger unit in the first aspect, the control method has all the beneficial effects of the aforementioned fresh air heat exchanger unit, which will not be elaborated further.

[0087] The steps for starting up the fresh air heat exchanger unit include: Obtain indoor carbon dioxide concentration parameter B1 and outdoor air particulate matter concentration parameter B2.

[0088] If the indoor carbon dioxide concentration parameter B1 is lower than the third preset value K3, and the outdoor air particulate matter concentration parameter B2 is not higher than the fourth preset value K4, the fresh air mode of the fresh air heat exchanger unit will be activated.

[0089] By introducing the detection and judgment of indoor carbon dioxide concentration and outdoor particulate matter concentration during the startup phase, it effectively avoids introducing polluted air when outdoor air quality is poor, or unnecessary fresh air exchange when indoor air quality is good. Thus, while ensuring indoor air quality, it further optimizes energy consumption and achieves a balance between comfort, health and energy saving.

[0090] In some embodiments, the fresh air heat exchanger unit includes a fourth fresh air mode, in which the third fresh air duct 130 is opened to allow fresh air to be blown out through the third fresh air duct 130. In the first or third fresh air mode, the control method includes: Obtain the supply air temperature parameter Ta and the supply air humidity parameter Rha.

[0091] If the supply air temperature parameter Ta is lower than the third preset temperature T3 or the supply air humidity parameter Rha is lower than the first preset humidity, the fresh air heat exchanger unit will be switched to the fourth fresh air mode.

[0092] If the air supply temperature parameter Ta is between the third preset temperature T3 and the first preset temperature T1, then the flow rate of the coolant in the first heat exchanger 210 is reduced.

[0093] If the supply air temperature parameter Ta is between the third preset temperature T3 and the first preset temperature T1, and the supply air humidity is between the first preset humidity and the second preset humidity, then the flow rate of the coolant in the first heat exchanger 210 is controlled to be reduced to the minimum threshold.

[0094] By introducing real-time monitoring of the supply air temperature parameter Ta and the supply air humidity parameter Rha, and performing fine-grained control adjustments based on these parameters, this application effectively solves the problems of poor supply air comfort and energy waste caused by selecting a mode solely based on the fresh air inlet parameters. Specifically, in the first or third fresh air mode, when the supply air shows a tendency to be too cold or too dry, the system can promptly switch to the fourth fresh air mode to avoid excessively cold indoor air or excessively low humidity. Alternatively, the supply air temperature and humidity can be gently increased by reducing the flow rate of the coolant in the first heat exchanger 210, avoiding overtreatment.

[0095] In the second fresh air mode, the system can flexibly adjust the flow rate of the coolant in the second heat exchanger 220 or reduce the flow rate of the coolant in the first heat exchanger 210 to accommodate different combinations of fresh air temperature, supply air temperature, and humidity. This allows for precise control of the supply air parameters, preventing over-cooling or dehumidification and ensuring that the supply air remains within a comfortable and energy-efficient range. This dynamic adjustment mechanism based on supply air feedback significantly improves the intelligence level of the fresh air heat exchange unit's operation and the user experience, while also optimizing energy efficiency.

[0096] In the second fresh air mode, the control methods include: Obtain the supply air temperature parameter Ta and the supply air humidity parameter Rha.

[0097] If the fresh air temperature parameter T0 is less than the fourth preset temperature T4, and the supply air temperature parameter Ta is less than the first preset temperature T1, then the flow rate of the coolant in the second heat exchanger 220 will be reduced.

[0098] If the fresh air temperature parameter T0 is between the fourth preset temperature T4 and the second preset temperature T2, and the supply air temperature parameter Ta is less than the first preset temperature T1, then the flow rate of the coolant in the second heat exchanger 220 will be increased.

[0099] If the supply air temperature parameter Ta is less than the first preset temperature T1, and the supply air humidity parameter Rha is lower than the first preset humidity, then the fresh air heat exchanger unit is controlled to switch to the fourth fresh air mode.

[0100] If the supply air temperature parameter Ta is less than the first preset temperature T1, and the supply air humidity parameter Rha is between the first preset humidity and the second preset humidity, then the flow rate of the coolant in the first heat exchanger 210 is controlled to be reduced to the minimum threshold.

[0101] This application can finely adjust the coolant flow rate of the second heat exchanger 220 and the first heat exchanger 210 in the second fresh air mode based on the real-time monitored fresh air temperature parameter T0, supply air temperature parameter Ta, and supply air humidity parameter Rha, so as to avoid energy waste when strong cooling or dehumidification is not required.

[0102] For example, when the fresh air temperature is low and the supply air meets the standard, reducing the coolant flow rate of the second heat exchanger 220 effectively saves operating energy consumption. At the same time, when the supply air conditions have reached the ideal state (low temperature and low humidity), the unit can intelligently switch to the fourth fresh air mode, further simplifying the operation path and eliminating the need for energy consumption at the first heat exchanger 210 and the second heat exchanger 220, thereby improving the overall energy efficiency ratio of the system.

[0103] In addition, for situations where the supply air temperature meets the standard but the humidity still needs to be finely adjusted, precise humidity control is achieved by reducing the coolant flow rate of the first heat exchanger 210 to the minimum threshold, such as by reducing the operating power of the variable frequency pump 230 to the minimum threshold (such as about 10-15% of the rated power), ensuring the comfort of the indoor environment, while avoiding unnecessary energy consumption caused by excessive dehumidification.

[0104] Thirdly, embodiments of this application also provide a control module 360, such as... Figure 11 As shown, the control module 360 ​​includes a processor 361, a communication interface 362, a memory 363, and a communication bus 364. The processor 361, communication interface 362, and memory 363 communicate with each other via the communication bus 364. The memory 363 stores the computer program.

[0105] In one embodiment of this application, when the processor 361 executes a program stored in the memory 363, it implements the steps of the control method provided in any of the method embodiments of the second aspect.

[0106] Fourthly, embodiments of this application also provide a computer-readable storage medium having a computer program stored thereon, wherein the computer program, when executed by a processor, implements the steps of the control method provided in any of the method embodiments of the second aspect.

[0107] 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.

[0108] 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.

[0109] 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 heat exchanger unit, characterized in that, include: A heat exchange assembly, comprising a first heat exchanger and a second heat exchanger, wherein in cooling or dehumidification mode, the heat exchange temperature of the second heat exchanger is higher than that of the first heat exchanger. The first fresh air flow duct, the first heat exchanger is disposed in the first fresh air flow duct; And a second fresh air duct, wherein the second heat exchanger is disposed within the second fresh air duct; The fresh air heat exchange unit is configured to have a first fresh air mode, a second fresh air mode and a third fresh air mode; In the first fresh air mode, the first fresh air duct is opened so that fresh air is blown out through the first fresh air duct; In the second fresh air mode, at least a portion of the first fresh air duct and the second fresh air duct are opened in series so that the fresh air is blown out after being heated by the first heat exchanger and the second heat exchanger in sequence. In the third fresh air mode, the second fresh air duct is opened to allow fresh air to be blown out through the second fresh air duct.

2. The fresh air heat exchanger unit according to claim 1, characterized in that, The fresh air heat exchange unit includes: The first air valve, the first heat exchanger, and the first air valve are sequentially installed at the upstream and downstream ends of the first fresh air flow channel; The second air valve is located at the ventilation opening between the first fresh air duct and the second fresh air duct. The third air valve and the fourth air valve are installed sequentially at the upstream and downstream ends of the second fresh air flow channel; In the second fresh air duct, the second heat exchanger is installed between the vent and the fourth air valve.

3. The fresh air heat exchanger unit according to claim 2, characterized in that, The fresh air heat exchange unit is configured as follows: In the first fresh air mode, the second air valve is closed, at least one of the third air valve and the fourth air valve is closed, and the first air valve is opened to open the first fresh air flow channel. In the second fresh air mode, the first air valve and the third air valve are closed, and the second air valve and the fourth air valve are opened, so that the fresh air is blown out after being heated by the first heat exchanger and the second heat exchanger in sequence. In the third fresh air mode, the first air valve is closed, and the third and fourth air valves are opened to open the second fresh air flow channel.

4. The fresh air heat exchanger unit according to claim 1, characterized in that, The heat exchange assembly includes: A variable frequency pump, connected in series with the first heat exchanger, is used to adjust the coolant flow rate of the first heat exchanger; An opening valve is connected in series with the second heat exchanger to form a heat exchange branch, and the heat exchange branch is connected in series with the first heat exchanger. And a bypass branch, wherein the bypass branch is connected in series with the first heat exchanger and the bypass branch is connected in parallel with the heat exchange branch; The heat exchange assembly is configured as follows: In the first fresh air mode, the first heat exchanger is connected to the bypass branch, and the opening valve is closed; In the second fresh air mode, the opening valve is opened to connect the first heat exchanger and the second heat exchanger; In the third fresh air mode, the opening valve is opened to connect the first heat exchanger and the second heat exchanger, and the coolant flow rate of the second heat exchanger in the third fresh air mode is lower than the coolant flow rate in the second fresh air mode.

5. The fresh air heat exchanger unit according to claim 4, characterized in that, The opening degree of the valve in the third fresh air mode is lower than that in the second fresh air mode; and / or, The variable frequency pump operates at a lower frequency in the third fresh air mode than in the second fresh air mode.

6. The fresh air heat exchanger unit according to any one of claims 1-5, characterized in that, The fresh air heat exchange unit includes: The heat exchange core is in which fresh air and return air exchange heat. The first fresh air flow channel and the second fresh air flow channel are located downstream of the heat exchange core. And a third fresh air duct, which is located downstream of the heat exchange core; When the fresh air heat exchanger is in the fourth fresh air mode, the third fresh air flow channel is opened so that fresh air is blown out through the third fresh air flow channel.

7. The fresh air heat exchanger unit according to claim 6, characterized in that, The fresh air heat exchange unit includes: The fifth air valve is installed in the third fresh air duct and is configured as follows: In the fourth fresh air mode, the fifth air valve opens to open the third fresh air duct; In the first fresh air mode, the second fresh air mode, and the third fresh air mode, the fifth air valve is closed to shut off the third fresh air flow channel.

8. The fresh air heat exchanger unit according to claim 6, characterized in that, The fresh air heat exchange unit includes: Particulate matter sensor, used to detect outdoor particulate matter concentration parameters; The first temperature and humidity sensor is used to detect outdoor temperature and humidity parameters. The second temperature and humidity sensor is disposed between the heat exchange core and the first fresh air flow channel to detect the fresh air temperature and humidity parameters. The third temperature and humidity sensor is installed at the fresh air outlet to detect the outlet air temperature and humidity parameters. Carbon dioxide concentration sensor, used to detect indoor carbon dioxide concentration parameters; The system includes a control module, which, along with the particulate matter sensor, the first temperature and humidity sensor, the second temperature and humidity sensor, the third temperature and humidity sensor, and the carbon dioxide concentration sensor, is used to acquire the outdoor particulate matter concentration parameter, the outdoor temperature parameter, the outdoor humidity parameter, the fresh air temperature parameter, the fresh air humidity parameter, the outlet air temperature parameter, the outlet air humidity parameter, and the indoor carbon dioxide concentration parameter; and the control module is configured to control the operating status of the fresh air heat exchanger unit.

9. A control method for a fresh air heat exchanger unit, characterized in that, The control method for controlling a fresh air heat exchange unit as described in any one of claims 1-8, wherein the control method comprises: Start the aforementioned fresh air heat exchanger unit; Obtain the fresh air temperature and humidity parameters and calculate the fresh air humidity content; If the humidity of the fresh air is not higher than the first preset value, and the difference between the fresh air temperature parameter and the first preset temperature is not lower than the second preset value, then the fresh air heat exchanger unit is controlled to switch to the third fresh air mode. If the humidity of the fresh air is higher than the first preset value and the temperature parameter of the fresh air is greater than the second preset temperature, then the fresh air heat exchanger unit is controlled to switch to the first fresh air mode. If the humidity of the fresh air is higher than the first preset value, and the temperature parameter of the fresh air is less than or equal to the second preset temperature, then the fresh air heat exchanger unit is controlled to switch to the second fresh air mode.

10. The control method for the fresh air heat exchanger unit according to claim 9, characterized in that, The fresh air heat exchange unit includes a fourth fresh air mode, in which the third fresh air duct is opened to allow fresh air to be blown out through the third fresh air duct; In the first fresh air mode or the third fresh air mode, the control method includes: Obtain supply air temperature and humidity parameters; If the supply air temperature parameter is lower than the third preset temperature or the supply air humidity parameter is lower than the first preset humidity, then control the fresh air heat exchanger unit to switch to the fourth fresh air mode. If the air supply temperature parameter is between the third preset temperature and the first preset temperature, then the flow rate of the coolant in the first heat exchanger is reduced. If the air supply temperature parameter is between the third preset temperature and the first preset temperature, and the air supply humidity is between the first preset humidity and the second preset humidity, then the flow rate of the coolant in the first heat exchanger is controlled to be reduced to the minimum threshold.

11. The control method for the fresh air heat exchanger unit according to claim 9, characterized in that, The fresh air heat exchange unit includes a fourth fresh air mode, in which the third fresh air duct is opened to allow fresh air to be blown out through the third fresh air duct; In the second fresh air mode, the control method includes: Obtain supply air temperature and humidity parameters; If the fresh air temperature parameter is less than the fourth preset temperature and the supply air temperature parameter is less than the first preset temperature, then the flow rate of the coolant in the second heat exchanger is reduced. If the fresh air temperature parameter is between the fourth preset temperature and the second preset temperature, and the supply air temperature parameter is less than the first preset temperature, then the flow rate of the coolant in the second heat exchanger is increased. If the supply air temperature parameter is less than the first preset temperature and the supply air humidity parameter is lower than the first preset humidity, then the fresh air heat exchanger unit is controlled to switch to the fourth fresh air mode. If the air supply temperature parameter is less than the first preset temperature, and the air supply humidity parameter is between the first preset humidity and the second preset humidity, then the flow rate of the coolant in the first heat exchanger is controlled to be reduced to the minimum threshold.

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