Temperature and humidity integrated control fan coil equipment based on EC fan and control method

Abstract

The invention discloses temperature and humidity integrated control fan coil equipment based on an EC fan and a control method, and belongs to the technical field of air conditioning equipment. The equipment comprises a shell, an EC fan, a surface air cooler and a parallel air channel structure composed of a primary air return channel, a secondary air return channel and an air mixing area. The intelligent control unit is used for cooperatively adjusting a water valve of a surface air cooler, the rotating speed of an EC fan and the opening degree of an air valve, and a humidity-first dynamic air mixing control strategy is adopted, so that decoupling and accurate control over temperature and humidity are achieved. The system effectively solves the problems of overcooling and cold and heat offset caused by dehumidification in a traditional scheme, and has the comprehensive advantages of being remarkable in energy-saving effect, high in control precision, high in response speed, low in operation noise and high in intelligent degree.

Description

Technical Field

[0001] This invention relates to the field of air conditioning equipment technology, and more specifically, to a temperature and humidity integrated control fan coil unit based on an EC fan and its control method. Background Technology

[0002] Fan coil units, as key terminal equipment in air conditioning systems, are widely used in various types of buildings. Traditional fan coil units mostly use AC fans and achieve temperature control by adjusting water valves. However, this conventional solution has significant drawbacks: First, based on the principle of cooling and dehumidification, while removing excess humidity from the air, it often results in excessively low supply air temperatures, necessitating "reheating" to meet comfort requirements, leading to severe energy waste due to "heat offsetting." Second, its control precision is limited, response is slow, and the fan operates with considerable noise, making it difficult to meet the demands of high-precision environmental control and high-quality indoor environments.

[0003] To address these issues, the industry has explored various technologies, such as using dual-mode coils, introducing EC fans, or variable air volume (VAV) control. However, these solutions are either complex or fail to completely resolve the fundamental contradiction of coupled temperature and humidity control, leaving room for improvement in control accuracy, energy efficiency, and system integration. Therefore, there is an urgent need for an innovative solution that can achieve efficient decoupling and precise control of temperature and humidity while operating quietly. Summary of the Invention

[0004] In view of the above-mentioned technical problems in related technologies, the present invention proposes a temperature and humidity integrated control fan coil unit and control method based on EC fan, which can overcome the above-mentioned shortcomings of the prior art.

[0005] To achieve the above-mentioned technical objectives, the technical solution of the present invention is implemented as follows: A fan coil unit with integrated temperature and humidity control based on EC fans; The temperature and humidity integrated control fan coil unit based on EC fan includes a housing, a fan, and a surface cooler; The fan is an EC fan; The housing is provided with a parallel air duct structure, which includes a primary return air duct, a secondary return air duct, and a mixing air zone. The primary return air duct flows through the surface cooler, and the secondary return air duct bypasses the surface cooler. The outlets of the primary return air duct and the secondary return air duct are both connected to the mixing air zone, and the primary return air duct and the secondary return air duct are respectively equipped with a first electric regulating air valve and a second electric regulating air valve whose opening can be independently adjusted. The device also includes an intelligent control unit, which is communicatively connected to the EC fan, the first electrically adjustable air valve, the second electrically adjustable air valve, and the electrically adjustable valve of the surface cooler.

[0006] Furthermore, the EC fan adopts a permanent magnet synchronous motor driven by electronic commutation technology, and integrates a microprocessor-based adaptive fuzzy PID control algorithm and an intelligent fault diagnosis system; the intelligent fault diagnosis system is used to monitor the motor temperature and vibration parameters, and upload data through a communication interface.

[0007] Furthermore, the inner wall of the housing is lined with sound-absorbing cotton; the air mixing zone is equipped with angle-adjustable guide vanes; and the inner walls of both the primary return air channel and the secondary return air channel are lined with rubber and plastic insulation material.

[0008] Furthermore, the thickness of the sound-absorbing cotton is not less than 10mm; the adjustment range of the guide vanes is 15° to 75°; and the thickness of the rubber and plastic insulation material is not less than 15mm.

[0009] Furthermore, the surface cooler has a three-row copper tube and aluminum fin structure, wherein the outer diameter of the copper tube is 9.52 mm and the fin spacing is 2.5 mm.

[0010] Furthermore, the intelligent control unit includes: The sensor module includes a first temperature and humidity sensor disposed in the primary return air channel, a second temperature and humidity sensor disposed at the air supply end of the housing, and a third temperature and humidity sensor disposed at the air return end of the housing. The control module uses an ARM processor and has a built-in control algorithm; The communication module supports at least one of the following communication protocols: BACnet / IP, MODBUS-RTU, or CAN bus.

[0011] According to another aspect of the present invention, a control method for a temperature and humidity integrated control fan coil unit based on an EC fan is provided; The control method for the temperature and humidity integrated control fan coil unit based on EC fans adopts a humidity-priority dynamic air mixing control strategy, including the following steps: The sensor module collects indoor temperature and humidity parameters, supply air temperature and humidity parameters, outlet air temperature and humidity at the first temperature and humidity sensor in the primary return air channel, and EC fan operating status parameters in real time. Based on the deviation between the actual indoor humidity and the set humidity, select the humidity priority control mode, temperature and humidity coordinated control mode, or energy-saving operation mode. When the humidity priority control mode is executed, the opening of the electric regulating valve of the surface cooler is increased and the opening of the second electric regulating air valve is decreased. At the same time, the outlet air temperature at the second temperature and humidity sensor in the mixing zone is controlled to be higher than the real-time monitored dew point temperature by a safety margin.

[0012] Furthermore, the step of selecting the control mode based on the deviation between the actual indoor humidity and the set humidity specifically involves: If the actual humidity is higher than the set value of 3%RH, then the humidity priority control mode will be executed. If the actual humidity is within the range of -3%RH to +3%RH of the set value, then the temperature and humidity coordinated control mode is executed. If the actual humidity is lower than the set value of 3%RH, then the energy-saving operation mode will be executed.

[0013] Furthermore, when executing the humidity priority control mode, the opening of the electric regulating valve is increased to 85%-90% within 3 seconds, the opening of the second electric regulating air valve is decreased to 20%-25%, and the outlet air temperature at the second temperature and humidity sensor in the mixing zone is controlled to be 1.5℃±0.5℃ higher than the dew point temperature.

[0014] Furthermore, when executing the temperature and humidity coordinated control mode, the primary return air ratio is dynamically controlled within the range of 35%-75% using an adaptive PID algorithm; when executing the energy-saving operation mode, the EC fan speed is reduced, the electric regulating valve opening is decreased, and the secondary return air ratio is increased; the method also includes fault diagnosis and protection steps, real-time monitoring of equipment operation status, and execution of corresponding automatic protection measures when the outlet air temperature at the second temperature and humidity sensor in the mixing zone is close to the dew point temperature, the EC fan motor temperature is too high, or the sensor module fails.

[0015] The beneficial effects of this invention are as follows: By combining a high-efficiency EC fan with a unique parallel air duct structure and implementing a humidity-priority intelligent mixed air control strategy, temperature and humidity can be independently and precisely adjusted, effectively avoiding the energy cancellation phenomenon in the traditional dehumidification process. This results in a comprehensive optimization effect that significantly reduces the overall energy consumption of the system, greatly improves the accuracy and response speed of environmental control, significantly improves the noise level of equipment operation, and enhances the integration capability with the building management system. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the overall structure of a temperature and humidity integrated control fan coil unit based on an EC fan, according to an embodiment of the present invention. Figure 2 This is a performance comparison diagram of a temperature and humidity integrated control fan coil unit based on an EC fan according to an embodiment of the present invention and the prior art; In the diagram: 1. Housing; 101. Sound-absorbing cotton; 2. EC fan; 3. Cooler; 301. Electric regulating valve; 4. Parallel air duct structure; 401. Primary return air duct; 402. Secondary return air duct; 403. Mixing air zone; 404. Rubber and plastic insulation material; 5. Air valve assembly; 501. First electric regulating air valve; 502. Second electric regulating air valve; 6. Intelligent control unit; 601. Sensor module; 6011. First temperature and humidity sensor; 6012. Second temperature and humidity sensor; 6013. Third temperature and humidity sensor; 602. Control module; 603. Communication module; 604. Human-machine interaction module. Detailed Implementation

[0018] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention are within the scope of protection of the present invention.

[0019] like Figure 1 As shown in the figure, a temperature and humidity integrated control fan coil unit based on an EC fan according to an embodiment of the present invention includes a housing 1, a fan and a surface cooler 3; The fan is EC fan 2; The housing 1 is provided with a parallel air duct structure 4, which includes a primary return air duct 401, a secondary return air duct 402, and a mixing air zone 403. The primary return air duct 401 flows through the surface cooler 3, and the secondary return air duct 402 bypasses the surface cooler 3; The outlets of the primary return air duct 401 and the secondary return air duct 402 are both connected to the mixing air zone 403, and the primary return air duct 401 and the secondary return air duct 402 are respectively provided with a first electric regulating air valve 501 and a second electric regulating air valve 502 whose opening can be independently adjusted. The device also includes an intelligent control unit 6, which is communicatively connected to the EC fan 2, the first electric regulating valve 501, the second electric regulating valve 502, and the electric regulating valve 301 of the surface cooler 3.

[0020] According to an embodiment of the present invention, a temperature and humidity integrated control fan coil unit based on an EC fan is provided. In a specific embodiment, the EC fan 2 is a permanent magnet synchronous motor driven by electronic commutation technology, and integrates a microprocessor-based adaptive fuzzy PID control algorithm and an intelligent fault diagnosis system. The intelligent fault diagnosis system is used to monitor the motor temperature and vibration parameters, and upload data through a communication interface.

[0021] According to an embodiment of the present invention, a temperature and humidity integrated control fan coil unit based on an EC fan is provided. In a specific embodiment, the inner wall of the housing 1 is attached with sound-absorbing cotton 101; the mixing zone 403 is provided with angle-adjustable guide vanes; and the inner walls of the primary return air channel 401 and the secondary return air channel 402 are both provided with rubber and plastic insulation material 404.

[0022] According to an embodiment of the present invention, a temperature and humidity integrated control fan coil unit based on an EC fan is provided. In a specific embodiment, the thickness of the sound-absorbing cotton 101 is not less than 10mm; the adjustment range of the guide vanes is 15° to 75°; and the thickness of the rubber and plastic insulation material 404 is not less than 15mm.

[0023] According to an embodiment of the present invention, a temperature and humidity integrated control fan coil unit based on an EC fan is provided. In a specific embodiment, the surface cooler 3 is a three-row copper tube aluminum fin structure, wherein the outer diameter of the copper tube is 9.52 mm and the fin spacing is 2.5 mm.

[0024] According to an embodiment of the present invention, a temperature and humidity integrated control fan coil unit based on an EC fan is provided. In a specific embodiment, the intelligent control unit 6 includes: The sensor module 601 includes a first temperature and humidity sensor 6011 disposed in the primary return air channel 401, a second temperature and humidity sensor 6012 disposed at the air supply end of the housing 1, and a third temperature and humidity sensor 6013 disposed at the air return end of the housing 1. The control module 602 uses an ARM processor and has a built-in control algorithm; The communication module 603 supports at least one of the following communication protocols: BACnet / IP, MODBUS-RTU, or CAN bus.

[0025] Secondly, according to an embodiment of the present invention, a control method for a temperature and humidity integrated control fan coil unit based on an EC fan adopts a humidity-priority dynamic air mixing control strategy, including the following steps: The sensor module 601 collects indoor temperature and humidity parameters, supply air temperature and humidity parameters, outlet air temperature and humidity at the first temperature and humidity sensor 6011 in the primary return air channel 401, and EC fan 2 operating status parameters in real time. Based on the deviation between the actual indoor humidity and the set humidity, select the humidity priority control mode, temperature and humidity coordinated control mode, or energy-saving operation mode. When the humidity priority control mode is executed, the opening of the electric regulating valve 301 of the surface cooler 3 is increased and the opening of the second electric regulating air valve 502 is decreased. At the same time, the outlet air temperature at the second temperature and humidity sensor 6012 of the mixing zone 403 is controlled to be higher than the real-time monitored dew point temperature by a safety margin.

[0026] According to an embodiment of the present invention, a control method for a temperature and humidity integrated control fan coil unit based on an EC fan, in a specific embodiment, the step of selecting the control mode based on the deviation between the actual indoor humidity and the set humidity specifically includes: If the actual humidity is higher than the set value of 3%RH, then the humidity priority control mode will be executed. If the actual humidity is within the range of -3%RH to +3%RH of the set value, then the temperature and humidity coordinated control mode is executed. If the actual humidity is lower than the set value of 3%RH, then the energy-saving operation mode will be executed.

[0027] According to an embodiment of the present invention, a control method for a temperature and humidity integrated control fan coil unit based on an EC fan is described. In a specific embodiment, when the humidity priority control mode is executed, the opening of the electric regulating valve 301 is increased to 85%-90% within 3 seconds, the opening of the second electric regulating air valve 502 is decreased to 20%-25%, and the outlet air temperature at the second temperature and humidity sensor 6012 of the mixing zone 403 is controlled to be 1.5℃±0.5℃ higher than the dew point temperature.

[0028] According to an embodiment of the present invention, a control method for a temperature and humidity integrated control fan coil unit based on an EC fan is provided. In a specific embodiment, when the temperature and humidity coordinated control mode is executed, the primary return air ratio is dynamically controlled within the range of 35%-75% using an adaptive PID algorithm. When the energy-saving operation mode is executed, the speed of the EC fan 2 is reduced, the opening of the electric regulating valve 301 is decreased, and the secondary return air ratio is increased. The method also includes a fault diagnosis and protection step, which monitors the equipment operating status in real time and executes corresponding automatic protection measures when the outlet air temperature at the second temperature and humidity sensor 6012 in the mixing zone 403 is close to the dew point temperature, the motor temperature of the EC fan 2 is too high, or the sensor module 601 is faulty.

[0029] To facilitate understanding of the above technical solutions of the present invention, the following detailed description of the above technical solutions of the present invention will be provided through specific embodiments and principles.

[0030] According to the present invention, a temperature and humidity integrated control fan coil unit based on an EC fan includes a housing 1, an EC fan 2, a surface cooler 3, a parallel air duct structure 4, a damper assembly 5, and an intelligent control unit 6.

[0031] Casing 1: The housing 1 forms the main frame of the equipment and is typically made of galvanized steel sheet. Its interior forms a sealed air duct space, ensuring airflow follows a preset path. To reduce operating noise, the inner wall of the housing 1 is preferably lined with sound-absorbing cotton 101 with a thickness of not less than 10mm. The outer surface can be treated with processes such as electrostatic spraying to improve corrosion resistance and aesthetics.

[0032] EC Fan 2: The fan is an EC fan 2, which is the core drive component of the equipment. This EC fan 2 preferably uses a permanent magnet synchronous motor driven by electronic commutation technology, and achieves precise speed control through a built-in microprocessor, for example, using an adaptive fuzzy PID control algorithm. It has a wide speed range, for example, adjustable within 10%-110% of the rated speed, and high speed control accuracy, for example, reaching ±0.5% of the rated speed. Under rated operating conditions, its operating efficiency is not less than 90%, and its protection level reaches IP54. Furthermore, the EC fan 2 integrates an intelligent fault diagnosis system, which can monitor parameters such as motor temperature and vibration in real time, and upload data to the building management system through communication interfaces supported by MODBUS-RTU and CAN bus protocols.

[0033] Surface cooler 3: The surface cooler 3 is a key component for heat and moisture exchange. It preferably employs a three-row copper tube and aluminum fin structure, where the copper tube outer diameter is, for example, 9.52 mm, and the tube wall thickness is not less than 0.35 mm. The fins are preferably made of hydrophilic aluminum foil material, with a fin spacing of, for example, 2.5 mm. The heat exchange area of ​​the surface cooler 3 can be designed according to the rated air volume to ensure a heat exchange efficiency of not less than 85% under rated operating conditions. To regulate the chilled water flow rate, an electric regulating valve 301 is installed on the return water pipe of the surface cooler 3.

[0034] Parallel air duct structure 4: The parallel air duct structure 4 is one of the key innovations of this invention. It is set inside the housing 1 and mainly includes a primary return air duct 401, a secondary return air duct 402, and a mixing air zone 403.

[0035] The primary return air duct 401 flows through the surface cooler 3 and undertakes the main dehumidification and cooling functions. To reduce cooling loss, the inner wall of the duct is provided with an insulation layer with a thickness of not less than 15mm, and the preferred material is rubber-plastic insulation material 404.

[0036] The secondary return air duct 402 bypasses the surface cooler 3 and is used to provide uncooled and undehumidified return air for subsequent adjustment of the supply air temperature. The inner wall of this duct is also provided with an insulation layer with a thickness of not less than 15mm.

[0037] The mixing zone 403 is located at the intersection of the outlets of the primary return air channel 401 and the secondary return air channel 402. Preferably, the mixing zone 403 is equipped with electrically adjustable guide vanes, with an adjustment range of, for example, 15°-75°, to ensure that the airflow from the two channels can be fully mixed, achieving a mixing uniformity of over 95%.

[0038] Air valve assembly 5: The damper assembly 5 is used to precisely adjust the airflow ratio of each air duct, and includes a first electrically adjustable damper 501 and a second electrically adjustable damper 502. The first electrically adjustable damper 501 is located at the inlet of the primary return air duct 401, and the second electrically adjustable damper 502 is located at the inlet of the secondary return air duct 402. These two dampers can be independently adjusted in opening. The electrically adjustable dampers can be made of high-quality aluminum alloy or other materials, and the valve body is designed with a streamlined shape to reduce airflow resistance. Their actuators can be driven by a 24V AC power supply and receive control signals of 0-10V DC voltage or 4-20mA current. The dampers have high adjustment accuracy, for example, ±1%, and a short full-stroke opening time, for example, no more than 30 seconds.

[0039] Intelligent Control Unit 6: The intelligent control unit 6 is the core of realizing intelligent operation of the equipment. It is communicatively connected to the EC fan 2, the first electrically adjustable air valve 501, the second electrically adjustable air valve 502, and the electrically adjustable valve 301 of the surface cooler 3. This unit mainly includes: Sensor module 601: Used to collect various operating parameters. It includes a first temperature and humidity sensor 6011 disposed within the primary return air duct 401, a second temperature and humidity sensor 6012 disposed at the air supply end of the housing 1, and a third temperature and humidity sensor 6013 disposed at the air return end of the housing 1. These sensors are preferably high-precision digital sensors with a fast sampling period, for example, 0.5 seconds. The third temperature and humidity sensor 6013 is preferably capable of measuring dew point temperature.

[0040] Control module 602: As the processing center, it preferably adopts a 32-bit ARM processor and has built-in intelligent control algorithms such as adaptive fuzzy PID, which are used to generate control commands based on sensor data.

[0041] Communication module 603: Used for data exchange between the device and external systems, it supports multiple communication protocols, such as BACnet / IP, MODBUS-RTU, CAN bus, etc.

[0042] Human-machine interaction module 604: may include an LCD screen and operation buttons, which facilitates on-site parameter setting, status monitoring and debugging.

[0043] Furthermore, the present invention also provides a method for integrated temperature and humidity control of the above-mentioned equipment. This method adopts a humidity-priority dynamic air mixing control strategy and mainly includes the following steps: Step 1: Parameter Acquisition The high-precision sensor in sensor module 601 collects parameters such as indoor temperature and humidity, supply air temperature and humidity, outlet air temperature and humidity at the first temperature and humidity sensor 6011 in primary return air channel 401, and the operating status of EC fan 2 in real time with a cycle of 0.5 seconds.

[0044] Step 2: Humidity assessment and mode selection The actual indoor humidity was compared with the set humidity value: If the actual humidity is higher than the set value of 3%RH, it is determined that the humidity load is too high, and step 3 is entered to execute the humidity priority control mode. If the actual humidity is within the range of ±3%RH of the set value, it is determined that the humidity basically meets the standard, and the process proceeds to step 4 to execute the temperature and humidity coordinated control mode. If the actual humidity is lower than the set value of 3%RH, it is determined that the wet load is low, and step 5 is entered to execute the energy-saving operation mode.

[0045] Step 3: Humidity Priority Control Mode When dehumidification is required as a priority, the system quickly executes the following coordinated control actions: The opening of the electric regulating valve 301 of the surface cooler 3 is increased to a higher level in a short period of time to enhance the dehumidification capacity; At the same time, the opening of the second electric regulating damper 502 is reduced to a lower level to reduce the amount of untreated return air mixed in; Based on the dew point temperature monitored in real time by the third temperature and humidity sensor 6013, the outlet air temperature at the second temperature and humidity sensor 6012 in the mixing zone 403 is precisely controlled to be higher than the dew point temperature by a safety margin to prevent condensation. The speed of EC fan 2 is automatically adjusted according to the real-time air volume demand.

[0046] Step 4: Temperature and Humidity Co-control Mode Once the humidity reaches the target level, the system switches to precise temperature and humidity control. The adaptive PID algorithm in control module 602 dynamically calculates and adjusts the optimal mixing ratio of primary return air and secondary return air, for example, controlling the primary return air ratio within the range of 35%-75%. Based on the deviation between the real-time indoor temperature and the set temperature, the above air mixing ratio is finely adjusted to achieve precise control of the supply air temperature. During this process, key system parameters are continuously monitored and kept within safe limits.

[0047] Step 5: Energy-saving operation mode When the ambient humidity load is low, the system operates with energy saving as the goal: Reduce the speed of EC fan 2 appropriately to meet only the minimum air volume requirement; Reduce the opening of the electric regulating valve 301 of the surface cooler 3 to the minimum value required to maintain the set temperature; Increasing the air volume ratio of the secondary return air duct 402, that is, increasing the opening of the second electric regulating damper 502, utilizes more uncooled return air, thereby reducing the system's cooling energy consumption.

[0048] Step 6: Fault Diagnosis and Protection The intelligent control unit 6 monitors the operating status of the entire equipment in real time. When an abnormality is detected, corresponding protection measures are automatically implemented. For example, when the outlet air temperature at the second temperature and humidity sensor 6012 in the mixing zone 403 is close to the dew point temperature, the operating parameters are automatically adjusted to activate the anti-condensation protection; when the motor temperature of EC fan 2 is too high, the load is automatically reduced or an alarm is triggered; when a sensor malfunctions, it can switch to a preset emergency operation mode to ensure the basic functions of the system.

[0049] In summary, by employing the above-mentioned technical solution of this invention, and combining a high-efficiency EC fan with a unique parallel air duct structure, and implementing a humidity-priority intelligent mixed air control strategy, temperature and humidity can be independently and precisely adjusted. This effectively avoids the energy cancellation phenomenon in traditional dehumidification processes, thereby achieving a comprehensive optimization effect that significantly reduces overall system energy consumption, greatly improves environmental control accuracy and response speed, significantly improves equipment operating noise levels, and enhances integration capabilities with building management systems.

[0050] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A temperature and humidity integrated control fan coil unit based on an EC fan, characterized in that, Includes housing (1), fan and surface cooler (3); The fan is an EC fan (2); The housing (1) is provided with a parallel air duct structure (4), which includes a primary return air duct (401), a secondary return air duct (402), and a mixing air zone (403). The primary return air duct (401) flows through the surface cooler (3), and the secondary return air duct (402) bypasses the surface cooler (3). The outlets of the primary return air duct (401) and the secondary return air duct (402) are both connected to the mixing air zone (403), and the primary return air duct (401) and the secondary return air duct (402) are respectively provided with a first electric regulating air valve (501) and a second electric regulating air valve (502) whose opening can be independently adjusted. The device also includes an intelligent control unit (6), which is communicatively connected to the EC fan (2), the first electric regulating valve (501), the second electric regulating valve (502), and the electric regulating valve (301) of the surface cooler (3).

2. The temperature and humidity integrated control fan coil unit based on an EC fan according to claim 1, characterized in that, The EC fan (2) is a permanent magnet synchronous motor driven by electronic commutation technology, and integrates a microprocessor-based adaptive fuzzy PID control algorithm and an intelligent fault diagnosis system; the intelligent fault diagnosis system is used to monitor the motor temperature and vibration parameters, and upload data through the communication interface.

3. A temperature and humidity integrated control fan coil unit based on an EC fan according to claim 1, characterized in that, The inner wall of the housing (1) is covered with sound-absorbing cotton (101); the air mixing zone (403) is provided with angle-adjustable guide vanes; the inner walls of the primary return air channel (401) and the secondary return air channel (402) are both provided with rubber and plastic insulation material (404).

4. A temperature and humidity integrated control fan coil unit based on an EC fan according to claim 3, characterized in that, The thickness of the sound-absorbing cotton (101) is not less than 10 mm; the adjustment range of the guide vanes is 15° to 75°; the thickness of the rubber and plastic insulation material (404) is not less than 15 mm.

5. A temperature and humidity integrated control fan coil unit based on an EC fan according to claim 1, characterized in that, The surface cooler (3) has a three-row copper tube and aluminum fin structure, wherein the outer diameter of the copper tube is 9.52 mm and the fin spacing is 2.5 mm.

6. A temperature and humidity integrated control fan coil unit based on an EC fan according to claim 1, characterized in that, The intelligent control unit (6) includes: The sensor module (601) includes a first temperature and humidity sensor (6011) disposed in the primary return air channel (401), a second temperature and humidity sensor (6012) disposed at the air supply end of the housing (1) and a third temperature and humidity sensor (6013) disposed at the return air end of the housing (1). The control module (602) uses an ARM processor and has a built-in control algorithm; The communication module (603) supports at least one of the following communication protocols: BACnet / IP, MODBUS-RTU, or CAN bus.

7. A method for integrated temperature and humidity control of the device according to any one of claims 1-6, characterized in that, A humidity-prioritized dynamic air mixing control strategy is adopted, including the following steps: The sensor module (601) collects indoor temperature and humidity parameters, supply air temperature and humidity parameters, outlet air temperature and humidity at the first temperature and humidity sensor (6011) in the primary return air channel (401) and EC fan (2) operating status parameters in real time. Based on the deviation between the actual indoor humidity and the set humidity, select the humidity priority control mode, temperature and humidity coordinated control mode, or energy-saving operation mode. When the humidity priority control mode is executed, the opening of the electric regulating valve (301) of the surface cooler (3) is increased and the opening of the second electric regulating air valve (502) is decreased. At the same time, the outlet air temperature at the second temperature and humidity sensor (6012) of the mixing zone (403) is controlled to be higher than the real-time monitored dew point temperature by a safety margin.

8. The control method for a temperature and humidity integrated control fan coil unit based on an EC fan according to claim 7, characterized in that, The control mode selection based on the deviation between the actual indoor humidity and the set humidity is specifically as follows: If the actual humidity is higher than the set value of 3%RH, then the humidity priority control mode will be executed. If the actual humidity is within the range of -3%RH to +3%RH of the set value, then the temperature and humidity coordinated control mode is executed. If the actual humidity is lower than the set value of 3%RH, then the energy-saving operation mode will be executed.

9. A control method for a temperature and humidity integrated control fan coil unit based on an EC fan, as described in claim 7 or 8, characterized in that, When the humidity priority control mode is executed, the opening of the electric regulating valve (301) is increased to 85%-90% within 3 seconds, the opening of the second electric regulating air valve (502) is decreased to 20%-25%, and the outlet air temperature at the second temperature and humidity sensor (6012) of the mixing zone (403) is controlled to be 1.5℃±0.5℃ higher than the dew point temperature.

10. The control method for a temperature and humidity integrated control fan coil unit based on an EC fan according to claim 8, characterized in that, When the temperature and humidity coordinated control mode is executed, the primary return air ratio is dynamically controlled within the range of 35%-75% through an adaptive PID algorithm; when the energy-saving operation mode is executed, the speed of the EC fan (2) is reduced, the opening of the electric regulating valve (301) is reduced, and the secondary return air ratio is increased; the method also includes fault diagnosis and protection steps, real-time monitoring of equipment operation status, and when the outlet air temperature at the second temperature and humidity sensor (6012) in the mixing air zone (403) is close to the dew point temperature, the motor temperature of the EC fan (2) is too high, or the sensor module (601) is faulty, corresponding automatic protection measures are executed.

Images