Whole house type frequency conversion fresh air dehumidification system

Abstract

The invention relates to the technical field of fresh air blowers, and discloses a whole house type frequency conversion fresh air dehumidification system which comprises an intelligent control module, an environment sensing module, an intelligent control module, an intelligent control module, an intelligent control module, an intelligent control module, an intelligent control module and an intelligent control module, the indoor air quality data collection module collects indoor air quality data in real time and transmits the indoor air quality data to the intelligent control module, the air processing module comprises a fresh air introduction unit, a return air circulation unit and a mixed air processing unit, and the mixed air processing unit is configured to mix outdoor fresh air and indoor return air according to a preset proportion; according to the whole house type variable frequency fresh air dehumidification system, the variable frequency compression unit and the variable frequency fan unit are adopted, the humidity control precision of + / -3% can be achieved within the daily dehumidification amount range of 45-145 L, meanwhile, energy consumption is reduced by 15-35%, noise is lower than 36 dB (A), the PM2.5 purification efficiency of double filter screens reaches 99.98%, the indoor air quality is remarkably improved, and the maintenance process is simplified.

Description

Technical Field

[0001] The present invention relates to the technical field of fresh air fans, and particularly to a whole-house variable-frequency fresh air dehumidification system. Background Art

[0002] A fresh air fan is an effective air purification device that can circulate indoor air. On the one hand, it discharges the dirty air indoors to the outside, and on the other hand, it inputs the fresh air outside into the room after measures such as sterilization, disinfection, and filtration, so that the air in the room is fresh and clean at all times.

[0003] In the existing fresh air fans, the fresh air dehumidification systems mostly adopt a fixed-frequency compressor and a single operating mode design, and it is difficult to adaptively adjust the operating strategy according to the dynamic changes of the indoor and outdoor environments (such as seasonal changes, temperature and humidity fluctuations, and air quality differences). Therefore, we urgently need a whole-house variable-frequency fresh air dehumidification system. Summary of the Invention

[0004] Aiming at the above technical deficiencies, the purpose of the present invention is to provide a whole-house variable-frequency fresh air dehumidification system to solve the problems raised in the above background art.

[0005] To solve the above technical problems, the present invention provides the following technical solution: A whole-house variable-frequency fresh air dehumidification device, including a housing, a return air outlet and a fresh air outlet are installed on the right side of the housing, a fresh air valve is installed on the left side of the fresh air outlet, a primary filter and a high-efficiency filter are arranged on the left side of the return air outlet and the fresh air outlet, a variable-frequency drive is arranged on the left side of the primary filter and the high-efficiency filter, a DC fan is installed at one end of the variable-frequency drive, a dehumidification module is arranged on the left side of the variable-frequency drive, a condenser and an evaporator are installed inside the dehumidification module, a variable-frequency compressor is arranged between the condenser and the evaporator, an electronic expansion valve is installed outside the variable-frequency compressor, and a supply air outlet is installed on the left side of the housing.

[0006] Preferably, the top cover plate is screwed to the top of the housing, and the front cover plate is screwed to the front of the housing.

[0007] A whole-house variable-frequency fresh air dehumidification system includes:

[0008] An intelligent control module for dynamically selecting an operating mode according to environmental parameters and generating control instructions;

[0009] An environmental perception module integrating a PM2.5 sensor, a CO 2 sensor, a temperature sensor, a humidity sensor and a TVOC sensor, which real-time collects indoor air quality data and transmits it to the intelligent control module;

[0010] An air treatment module, comprising a fresh air introduction unit, a return air circulation unit and a mixed air treatment unit, wherein the mixed air treatment unit is configured to mix outdoor fresh air and indoor return air in a preset ratio;

[0011] A dehumidification execution module, adopting a variable-frequency compression unit and a variable-frequency fan unit, and responding to the instructions of the intelligent control module to adjust the dehumidification power and the air supply volume;

[0012] A communication interaction module, supporting connection with a user terminal through a wireless network to realize remote mode switching, parameter setting and real-time query of air quality data;

[0013] The system is configured to, based on the real-time data of the environment perception module, autonomously switch between a total heat exchange mode, a rapid dehumidification mode or a mixed air dehumidification mode through the intelligent control module, and dynamically adjust the operating frequency of the variable-frequency compression unit, the rotation speed of the variable-frequency fan unit and the opening degree of the fresh air introduction unit, so as to achieve precise control of indoor humidity and optimization of air quality.

[0014] Preferably, in the total heat exchange mode, outdoor fresh air undergoes sensible heat and latent heat exchange with indoor exhaust air through a total heat exchanger, and is evenly distributed to each area in the room through a supply air duct. Moreover, the system maintains dynamic balance of the air inflow and outflow through an air volume balance algorithm to ensure the stability of the indoor positive pressure environment.

[0015] Preferably, in the rapid dehumidification mode, the fresh air introduction unit is closed, the return air circulation unit is started, and indoor air is sequentially purified through a primary filter layer and a high-efficiency HEPA filter layer, and then enters the dehumidification execution module for cyclic dehumidification; meanwhile, the variable-frequency compression unit operates at a high frequency to improve the condensation efficiency until the indoor humidity drops to a set threshold.

[0016] Preferably, in the mixed air dehumidification mode, the fresh air introduction unit is partially opened, outdoor fresh air and indoor return air are mixed in proportion through the mixed air treatment unit, and then sequentially undergo filtration purification, variable-frequency dehumidification and temperature compensation treatment to form air with a target moisture content and send it into the room through a supply air duct.

[0017] Preferably, the system further includes a positive pressure drainage unit, which directly discharges the condensed water to an external collection device through a built-in pressure driving mechanism, without relying on gravity or an external drainage pipe, and maintains the positive pressure environment inside the system during the drainage process to avoid backflow of pollutants.

[0018] Preferably, the air treatment module further integrates a multi-stage air purification unit, including a primary filter layer, a high-efficiency HEPA filter layer and an ultraviolet sterilization layer; wherein, the primary filter layer is used to intercept large particle pollutants, the high-efficiency HEPA filter layer is used to remove PM2.5 and microorganisms, and the ultraviolet sterilization layer is configured to perform real-time sterilization treatment on the circulating air.

[0019] Preferably, the intelligent control module is built-in with an evaporation temperature regulation algorithm. By collecting the pressure data of the condenser and the evaporator in real time, it calculates the current saturated evaporation temperature and dynamically compares it with the set value. Based on the difference, it adjusts the operating frequency of the variable-frequency compression unit to achieve closed-loop control of the evaporation temperature and precise regulation of the moisture content.

[0020] Compared with the prior art, the beneficial effects achieved by the present invention are as follows:

[0021] First, after the outdoor fresh air of the present invention enters through the fresh air inlet 12, the fresh air damper 13 adjusts the flow rate and mixes it with the indoor return air from the return air inlet 11. The mixed air sequentially passes through the primary filter 14 to intercept large particulate pollutants such as dust, and the high-efficiency filter 15 to remove PM2.5 and microorganisms. Subsequently, it is driven by the DC fan 17 into the dehumidification module 106. In this module, the condenser 18 and the evaporator 19 work together through the variable-frequency compressor 101 and the electronic expansion valve 102. The refrigerant absorbs heat in the evaporator to cool the air and separate out moisture, and the condenser releases heat to maintain thermal balance. Finally, the dry air is evenly sent into the room through the air supply outlet 103. The modular design of the top cover plate 104 and the front cover plate 105 facilitates the disassembly and maintenance of the equipment inside the housing 1. By dynamically adjusting the compressor frequency and the fan speed through variable-frequency technology, the system can achieve a humidity control accuracy of ±3% within the range of daily dehumidification capacity of 45 - 145L. At the same time, the energy consumption is reduced by 15 - 35%, the noise is lower than 36dB(A), and the purification efficiency of the double filter for PM2.5 reaches 99.98%, significantly improving the indoor air quality and simplifying the maintenance process.

[0022] Second, through the collaborative work of the intelligent control module, the environmental perception module, the air treatment module, the dehumidification execution module, and the communication interaction module, the present invention realizes the dynamic optimization of the indoor air quality. The environmental perception module integrates PM2.5, CO 2 , temperature and humidity, and TVOC sensors, and collects multi-region data in real time and transmits it to the intelligent control module. The latter preferentially responds to the humidity exceeding signal based on the fuzzy control algorithm, automatically switches to the total heat exchange, rapid dehumidification, or mixed air dehumidification mode, and realizes precise control by adjusting the variable-frequency compression unit frequency (range 20 - 80Hz), the DC fan speed (300 - 1200rpm), and the fresh air damper opening (0 - 100%). The communication interaction module supports the WiFi / LoRa protocol. Users can remotely set the humidity threshold (such as 40 - 60%) through the mobile phone APP and query the air quality data in real time. Through the linkage of multiple modules, the humidity control response speed of the system is increased by 30%, and the CO 2 concentration is stabilized below 1000ppm. At the same time, it supports docking with the building management system (BMS) to realize global monitoring of energy consumption data, and is applicable to the multi-scenario requirements of families, commerce, etc.

[0023] Thirdly, the present invention drives the condensate water to be directly discharged into an external water collection box through a built-in micro air pump (pressure 0.5 - 1 kPa), without relying on gravity or external pipelines. During the drainage process, the one-way valve prevents backflow, and the sealed design maintains a positive pressure environment in the system to avoid the intrusion of pollutants. This unit supports real-time monitoring of the condensate water flow rate (maximum 200 mL / min), with the drainage efficiency being 50% higher than that of traditional gravity type, and there is no risk of pipeline blockage. At the same time, a water quality sensor is integrated to detect abnormal conductivity (threshold > 500 μS / cm), trigger an alarm and close the drainage channel to prevent the leakage of corrosive liquids. Description of the Drawings

[0024] Figure 1 is the overall three-dimensional view of the present invention;

[0025] Figure 2 is the exploded three-dimensional view of the present invention;

[0026] Figure 3 is the three-dimensional view at the dehumidification module of the present invention;

[0027] Figure 4 is the overall system flow block diagram of the present invention;

[0028] Figure 5 is the flow block diagram of the total heat exchange mode of the present invention;

[0029] Figure 6 is the flow block diagram of the rapid dehumidification mode of the present invention;

[0030] Figure 7 is the flow block diagram of the mixed air dehumidification mode of the present invention.

[0031] Wherein: 1. Housing; 11. Return air inlet; 12. Fresh air inlet; 13. Fresh air valve; 14. Primary filter; 15. High-efficiency filter; 16. Variable frequency drive; 17. DC fan; 18. Condenser; 19. Evaporator; 101. Variable frequency compressor; 102. Electronic expansion valve; 103. Air supply outlet; 104. Top cover plate; 105. Front cover plate; 106. Dehumidification module. Detailed Embodiments

[0032] The following will further describe the detailed embodiments of the present invention in conjunction with the drawings. Detailed Embodiment 1

[0034] The following is a detailed embodiment of a whole-house variable frequency fresh air dehumidification device.

[0035] Please refer to Figures 1-7, A whole-house variable-frequency fresh air dehumidification device, including a housing 1. A return air inlet 11 and a fresh air inlet 12 are installed on the right side of the housing 1. A fresh air valve 13 is installed on the left side of the fresh air inlet 12. An initial filter 14 and a high-efficiency filter 15 are arranged on the left side of the return air inlet 11 and the fresh air inlet 12. A variable-frequency drive 16 is arranged on the left side of the initial filter 14 and the high-efficiency filter 15. A DC fan 17 is installed at one end of the variable-frequency drive 16. A dehumidification module 106 is arranged on the left side of the variable-frequency drive 16. A condenser 18 and an evaporator 19 are installed inside the dehumidification module 17. A variable-frequency compressor 101 is arranged between the condenser 18 and the evaporator 19. An electronic expansion valve 102 is installed outside the variable-frequency compressor 101. A supply air outlet 103 is installed on the left side of the housing 1.

[0036] Specifically, a top cover plate 104 is connected to the top of the housing 1 by screws, and a front cover plate 105 is connected to the front of the housing 1 by screws.

[0037] Through the above technical solution, after the outdoor fresh air enters through the fresh air inlet 12, the fresh air valve 13 adjusts the flow rate and mixes with the indoor return air from the return air inlet 11. The mixed air passes through the initial filter 14 in sequence to intercept large particle pollutants such as dust, and the high-efficiency filter 15 to remove PM2.5 and microorganisms. Subsequently, it is driven by the DC fan 17 and enters the dehumidification module 106. In this module, the condenser 18 and the evaporator 19 work together through the variable-frequency compressor 101 and the electronic expansion valve 102. The refrigerant absorbs heat in the evaporator to cool the air and separate out moisture, and the condenser releases heat to maintain thermal balance. Finally, the dry air is evenly sent into the room through the supply air outlet 103. The modular design of the top cover plate 104 and the front cover plate 105 facilitates the disassembly and maintenance of the equipment inside the housing 1. By dynamically adjusting the compressor frequency and the fan speed through variable-frequency technology, the system can achieve a humidity control accuracy of ±3% within the range of daily dehumidification capacity of 45 - 145L. At the same time, the energy consumption is reduced by 15 - 35%, the noise is lower than 36dB(A), and the purification efficiency of the dual filters for PM2.5 reaches 99.98%, significantly improving the indoor air quality and simplifying the maintenance process. Specific Embodiment Two

[0039] The following is a specific embodiment of a whole-house variable-frequency fresh air dehumidification system.

[0040] Please refer to Figures 1-7 , A whole-house variable-frequency fresh air dehumidification system, including:

[0041] An intelligent control module, used to dynamically select an operation mode according to environmental parameters and generate control instructions;

[0042] An environmental perception module, integrating a PM2.5 sensor, CO 2Sensors, temperature sensors, humidity sensors, and TVOC sensors collect indoor air quality data in real time and transmit it to the intelligent control module;

[0043] An air treatment module, including a fresh air introduction unit, a return air circulation unit, and a mixed air treatment unit. The mixed air treatment unit is configured to mix outdoor fresh air and indoor return air in a preset ratio;

[0044] A dehumidification execution module, using a variable-frequency compression unit and a variable-frequency fan unit, adjusts the dehumidification power and air supply volume in response to the instructions of the intelligent control module;

[0045] A communication interaction module supports connecting to a user terminal through a wireless network to achieve remote mode switching, parameter setting, and real-time query of air quality data;

[0046] The system is configured to autonomously switch between the total heat exchange mode, the rapid dehumidification mode, or the mixed air dehumidification mode based on the real-time data of the environmental perception module through the intelligent control module, and dynamically adjust the working frequency of the variable-frequency compression unit, the rotation speed of the variable-frequency fan unit, and the opening degree of the fresh air introduction unit to achieve precise control of indoor humidity and optimization of air quality.

[0047] Through the collaborative work of the intelligent control module, the environmental perception module, the air treatment module, the dehumidification execution module, and the communication interaction module, the dynamic optimization of indoor air quality is realized. The environmental perception module integrates PM2.5, CO 2 ., temperature and humidity, and TVOC sensors, collects multi-region data in real time and transmits it to the intelligent control module. The latter preferentially responds to the humidity exceeding signal based on the fuzzy control algorithm, automatically switches between the total heat exchange, rapid dehumidification, or mixed air dehumidification mode, and realizes precise control by adjusting the frequency of the variable-frequency compression unit (range 20 - 80Hz), the rotation speed of the DC fan (300 - 1200rpm), and the opening degree of the fresh air valve (0 - 100%). The communication interaction module supports the WiFi / LoRa protocol. Users can remotely set the humidity threshold (such as 40 - 60%) through the mobile APP and query the air quality data in real time. The system improves the humidity control response speed by 30% through multi-module linkage, and stabilizes the CO 2 concentration below 1000ppm. At the same time, it supports docking with the building management system (BMS) to achieve global monitoring of energy consumption data, and is applicable to multi-scenario requirements such as homes and commercial buildings.

[0048] Specifically, in the total heat exchange mode, after the outdoor fresh air exchanges sensible heat and latent heat with the indoor exhaust air through the total heat exchanger, it is evenly distributed to each area in the room through the air supply duct, and the system maintains the dynamic balance of the air volume in and out through the air volume balance algorithm to ensure the stability of the indoor positive pressure environment.

[0049] In the total heat exchange mode, the total heat exchanger recovers the sensible heat and latent heat in the exhaust air, preheats or precools the fresh air to reduce energy consumption. Specifically, in the implementation, the fresh air and the exhaust air flow reversely in the total heat exchanger, and a polymer membrane is used for heat and moisture exchange. The sensible heat recovery efficiency reaches 70%, and the latent heat recovery efficiency reaches 60%. The air volume balance algorithm monitors the air volume in and out in real time, and maintains a stable positive pressure (±5Pa) by adjusting the fan speed to ensure uniform distribution of fresh air to each area. During winter operation, the temperature of the fresh air is increased by 8-12°C after preheating, and the temperature is reduced by 5-8°C after precooling in summer. The annual energy saving is more than 40%. At the same time, it avoids the temperature fluctuations caused by traditional ventilation and is suitable for places sensitive to temperature and humidity such as hospitals and laboratories.

[0050] Specifically, in the rapid dehumidification mode, the fresh air introduction unit is closed, and the return air circulation unit is started. The indoor air is purified by passing through the primary filter layer and the high-efficiency HEPA filter layer in turn, and then enters the dehumidification execution module for circulating dehumidification. At the same time, the variable-frequency compression unit operates at a high frequency to improve the condensation efficiency until the indoor humidity drops to the set threshold.

[0051] The rapid dehumidification mode efficiently dehumidifies high-humidity environments (such as the rainy season and basements) by closing the fresh air introduction unit and starting the return air circulation. After the indoor return air is intercepted by particles larger than 5μm by the primary filter screen and purified by the high-efficiency HEPA filter screen (filtration efficiency 99.97%), it enters the dehumidification execution module. The variable-frequency compression unit operates at a high frequency (70-80Hz), and the evaporation temperature drops below 5°C to accelerate water condensation. The humidity can be reduced from 80% to 50% within 30 minutes. At the same time, the ultraviolet sterilization layer (UVC wavelength 253.7nm) sterilizes the circulating air, and the bacteria inactivation rate is >99.9%. This mode is suitable for sudden high-humidity scenarios, and the dehumidification energy efficiency ratio (COP) reaches 4.2, which is 25% higher than that of traditional fixed-frequency models.

[0052] Specifically, in the mixed air dehumidification mode, the fresh air introduction unit is partially opened. After the outdoor fresh air and the indoor return air are mixed in proportion by the mixed air treatment unit, they are filtered, purified, dehumidified by frequency conversion and temperature compensated in turn, and the air with the target moisture content is sent into the room through the air supply duct.

[0053] The mixed air dehumidification mode balances the oxygen content and the dehumidification demand by mixing fresh air and return air in proportion (such as the fresh air accounts for 30-70%). After the mixed air is purified by the high-efficiency HEPA filter screen, it enters the dehumidification module for variable-frequency dehumidification, and then the temperature is compensated by the PTC heater (the set air supply temperature is 18-25°C) to avoid discomfort caused by low-temperature air supply. The intelligent control module automatically adjusts the fresh air ratio according to the CO 2 concentration (threshold 1000ppm) to ensure that the indoor oxygen content meets the standard while the humidity control accuracy reaches ±2%. This mode is suitable for long-term living environments, with a 20% reduction in daily energy consumption and the TVOC removal rate increased to 85%.

[0054] Specifically, the system further includes a positive-pressure drainage unit that directly discharges condensed water to an external collection device through a built-in pressure driving mechanism, without relying on gravity or external drainage pipes, and maintains a positive-pressure environment inside the system during the drainage process to prevent backflow of pollutants.

[0055] The positive-pressure drainage unit drives the condensed water to directly drain into an external water collection box through a built-in micro air pump (pressure 0.5 - 1 kPa), without relying on gravity or external pipes. During the drainage process, a one-way valve prevents backflow, and the sealed design maintains a positive-pressure environment in the system to prevent pollutants from invading. This unit supports real-time monitoring of the condensed water flow rate (maximum 200 mL / min), with a drainage efficiency 50% higher than that of traditional gravity drainage, and there is no risk of pipeline blockage. At the same time, a water quality sensor is integrated to detect abnormal conductivity (threshold > 500 μS / cm), trigger an alarm and close the drainage channel to prevent leakage of corrosive liquids.

[0056] Specifically, the air treatment module further integrates a multi-stage air purification unit, including a primary filter layer, a high-efficiency HEPA filter layer, and an ultraviolet sterilization layer. Among them, the primary filter layer is used to intercept large-particle pollutants, the high-efficiency HEPA filter layer is used to remove PM2.5 and microorganisms, and the ultraviolet sterilization layer is configured to perform real-time sterilization treatment on the circulating air.

[0057] Through the three-stage treatment of the multi-stage air purification unit with a primary filter screen (intercepting particles > 5 μm), a high-efficiency HEPA filter screen (removing particles ≥ 0.3 μm and microorganisms), and an ultraviolet sterilization layer (UVC intensity 100 μW / cm 2 ), the air is comprehensively purified. The primary filter screen can be washed and reused, the service life of the HEPA filter screen is extended to 12 months, and the ultraviolet sterilization layer dynamically adjusts the light intensity according to the fan speed (for example, the intensity decreases by 30% at low speed) to ensure the balance between sterilization efficiency and energy consumption. This unit reduces the PM2.5 concentration to 10 μg / m 3 Below, the total number of bacteria is reduced by 99.9%, and the TVOC removal rate is 85%.

[0058] Specifically, the intelligent control module has an evaporation temperature regulation algorithm built in. By collecting the pressure data of the condenser and evaporator in real time, it calculates the current saturated evaporation temperature and dynamically compares it with the set value, and adjusts the operating frequency of the variable-frequency compression unit based on the difference to achieve closed-loop control of the evaporation temperature and precise regulation of the moisture content.

[0059] The evaporation temperature control algorithm collects the evaporator pressure data in real time, calculates the current saturated evaporation temperature (such as fitting with the Antoine equation), and performs PID operation with the set value (such as 12°C), dynamically adjusting the frequency of the variable-frequency compressor (stepping 0.1 Hz), controlling the evaporation temperature error within ±1°C. This algorithm avoids frosting of the evaporator, improves the dehumidification efficiency while reducing energy consumption, making the system COP value reach 4.2, a 30% increase compared to traditional models. In addition, the algorithm combines seasonal parameters (such as increasing the set evaporation temperature by 2°C in winter) to prevent condensate from freezing in low-temperature environments and ensure stable operation throughout the year.

[0060] Although specific embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these specific embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A whole-house variable frequency fresh air dehumidification device, comprising a housing (1), characterized in that: The right side of the housing (1) is provided with a return air inlet (11) and a fresh air inlet (12); the left side of the fresh air inlet (12) is provided with a fresh air valve (13); the left sides of the return air inlet (11) and the fresh air inlet (12) are provided with a primary filter (14) and a high-efficiency filter (15); the left sides of the primary filter (14) and the high-efficiency filter (15) are provided with a variable frequency drive (16); one end of the variable frequency drive (16) is provided with a DC A fan (17), a dehumidification module (106) is arranged on the left side of the variable frequency drive (16), a condenser (18) and an evaporator (19) are installed on the inner side of the dehumidification module (17), a variable frequency compressor (101) is arranged between the condenser (18) and the evaporator (19), an electronic expansion valve (102) is installed on the outside of the variable frequency compressor (101), and an air supply outlet (103) is installed on the left side of the shell (1).

2. A whole-house variable frequency fresh air dehumidification device according to claim 1, characterized in that: The top of the shell (1) is screwed to a top cover plate (104), and the front of the shell (1) is screwed to a front cover plate (105).

3. A whole-house variable frequency fresh air dehumidification system, characterized by: include: Intelligent control module, used to dynamically select the operation mode and generate control instructions according to environmental parameters; The environmental sensing module integrates PM2.5 sensor, CO2 sensor, temperature sensor, humidity sensor and TVOC sensor to collect indoor air quality data in real time and transmit it to the intelligent control module; An air processing module, comprising a fresh air introduction unit, a return air circulation unit and a mixed air processing unit, wherein the mixed air processing unit is configured to mix outdoor fresh air and indoor return air according to a preset ratio; A dehumidification execution module adopts a variable frequency compression unit and a variable frequency fan unit, and adjusts the dehumidification power and air supply volume in response to the instructions of the intelligent control module; Communication interaction module, supports connection with user terminals via wireless network, realizes remote mode switching, parameter setting and real-time query of air quality data; The system is configured to autonomously switch between full heat exchange mode, rapid dehumidification mode or mixed air dehumidification mode through the intelligent control module based on the real-time data of the environmental sensing module, and dynamically adjust the operating frequency of the variable frequency compression unit, the speed of the variable frequency fan unit and the opening of the fresh air introduction unit to achieve precise control of indoor humidity and optimization of air quality.

4. A whole-house variable frequency fresh air dehumidification system according to claim 3, characterized in that: In the full heat exchange mode, the outdoor fresh air exchanges sensible heat and latent heat with the indoor exhaust air through the full heat exchanger, and is then evenly distributed to various indoor areas through the air supply duct. The system maintains a dynamic balance of inlet and outlet air volumes through an air volume balance algorithm to ensure a stable indoor positive pressure environment.

5. The whole-house variable frequency fresh air dehumidification system according to claim 3 is characterized by: In the rapid dehumidification mode, the fresh air introduction unit is closed and the return air circulation unit is started. The indoor air is purified by the primary filter layer and the high-efficiency HEPA filter layer in turn, and then enters the dehumidification execution module for cyclic dehumidification; at the same time, the variable frequency compression unit operates at a high frequency to improve the condensation efficiency until the indoor humidity drops to the set threshold.

6. The whole-house variable frequency fresh air dehumidification system according to claim 3, characterized in that: In the mixed air dehumidification mode, the fresh air introduction unit is partially opened, and the outdoor fresh air and the indoor return air are mixed in proportion by the mixed air processing unit, and then filtered and purified, subjected to variable frequency dehumidification and temperature compensation processing in sequence to form air with a target moisture content and delivered into the room through the air supply duct.

7. The whole-house variable frequency fresh air dehumidification system according to claim 3, characterized in that: The system also includes a positive pressure drainage unit, which discharges condensed water directly to an external collection device through a built-in pressure drive mechanism without relying on gravity or external drainage pipes, and maintains a positive pressure environment inside the system during the drainage process to avoid backflow of pollutants.

8. The whole-house variable frequency fresh air dehumidification system according to claim 3, characterized in that: The air treatment module further integrates a multi-stage air purification unit, including a primary filter layer, a high-efficiency HEPA filter layer and an ultraviolet sterilization layer; wherein the primary filter layer is used to intercept large particle pollutants, the high-efficiency HEPA filter layer is used to remove PM2.5 and microorganisms, and the ultraviolet sterilization layer is configured to perform real-time sterilization treatment on the circulating air.

9. The whole-house variable frequency fresh air dehumidification system according to claim 3, characterized in that: The intelligent control module has a built-in evaporation temperature control algorithm. By collecting the pressure data of the condenser and the evaporator in real time, the current saturated evaporation temperature is calculated and dynamically compared with the set value. The operating frequency of the variable frequency compression unit is adjusted based on the difference to achieve closed-loop control of the evaporation temperature and precise adjustment of the moisture content.

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