VAV air conditioning system based on temperature and humidity separate control technology

Abstract

The utility model discloses a VAV air conditioning system based on a temperature and humidity separate control technology, which comprises intelligent fresh air terminals, intelligent air supply terminals, a digital fresh air handling unit and a digital air conditioning unit, the air outlet side of the digital fresh air handling unit is connected with a fresh air header pipe, and the fresh air header pipe is connected with a plurality of intelligent fresh air terminals through fresh air branch pipes; the digital air conditioning unit is provided with an air return valve and a fresh air valve, the fresh air valve is connected with a fresh air header pipe, the air return valve is connected with an air return pipe, and the air outlet side of the digital air conditioning unit is connected with the intelligent air supply terminal through an air supply pipe. According to the VAV air conditioning system, fresh air is processed by the digital fresh air handling unit, circulating air is processed by the digital air conditioning unit, the adjusting performance is good, and all-around control over the temperature, the humidity and the air quality is achieved.

Description

Technical Field

[0001] This utility model relates to the field of all-air air conditioning system application technology in various buildings, and in particular to a VAV air conditioning system based on temperature and humidity control technology. Background Technology

[0002] VAV (Variable Air Volume) air conditioning systems regulate indoor temperature by changing the air supply volume. Unlike constant air volume systems, VAV systems automatically adjust the air supply volume according to changes in indoor load, thus achieving a balance between energy saving and comfort. Due to their energy efficiency, flexible control, and strong adaptability, VAV systems are widely used in large buildings such as office buildings, shopping malls, and hotels, and are especially suitable for places with large differences in heating and cooling loads and requiring zoned control. However, for situations with large variations in indoor humidity load, high requirements for indoor air quality, and a need for sufficient fresh air supply, their inherent shortcomings become apparent, making them unsuitable for these conditions.

[0003] There are two types of VAV air conditioning systems in existing civil and public buildings: one is where the air conditioning unit draws in fresh air, that is, fresh air is introduced from the outside and processed together with return air by the air conditioning unit before being sent out through the terminal air supply device; the other is where fresh air is centrally processed and then sent into the air conditioning unit, where it is processed together with return air by the air conditioning unit before being sent out through the terminal air supply device. For the working area corresponding to the air supply terminal, the existing VAV air conditioning system has poor regulation performance and cannot achieve comprehensive control of temperature, humidity and air quality. Utility Model Content

[0004] The purpose of this utility model is to provide a VAV air conditioning system based on temperature and humidity control technology to solve one or more technical problems existing in the prior art, and at least provide a beneficial option or create conditions.

[0005] The technical solution adopted to solve the above-mentioned technical problems is as follows:

[0006] This utility model provides a VAV air conditioning system based on temperature and humidity control technology, including:

[0007] The intelligent fresh air terminal is equipped with multiple units;

[0008] The intelligent air supply terminal is equipped with multiple units;

[0009] The digital fresh air unit is provided with at least one, and the air outlet side of the digital fresh air unit is connected to a fresh air main pipe, and the fresh air main pipe is connected to multiple intelligent fresh air terminals through fresh air branch pipes.

[0010] The digital air conditioning unit is provided with at least one, wherein the air inlet side of the digital air conditioning unit is provided with a return air valve and a fresh air valve, the fresh air valve is connected to the fresh air main pipe, the return air valve is connected to a return air pipe, and the air outlet side of the digital air conditioning unit is connected to multiple intelligent air supply terminals through an air supply pipe.

[0011] The beneficial effects of this utility model's VAV air conditioning system are:

[0012] This invention divides the traditional VAV system, where fresh air and return air are handled by a single device, into two independent systems: fresh air is handled by a digital fresh air handling unit, and recirculated air is handled by a digital air conditioning unit. One digital fresh air handling unit corresponds to one digital air conditioning unit, or one digital fresh air handling unit corresponds to multiple digital air conditioning units. In operation, the digital fresh air handling unit centrally collects and processes fresh air, which is then delivered to each floor or zone through the main fresh air duct. A portion of the fresh air is delivered to work areas requiring humidity and air quality control by intelligent fresh air terminals. Another portion of the fresh air enters the digital air conditioning unit and, after being processed by the digital air conditioning unit, is delivered to work areas in open spaces via intelligent air supply terminals. The intelligent fresh air terminals are located on the fresh air branch ducts in the work areas and are responsible for adjusting the fresh air volume; the intelligent air supply terminals are located on the air supply ducts in the work areas and are responsible for delivering air from the digital air conditioning units to each work area as needed. As a result, this VAV air conditioning system has excellent regulation performance and achieves comprehensive control of temperature, humidity, and air quality.

[0013] As a further improvement to the above technical solution, the digital fresh air unit includes a fresh air fan for regulating the supply of fresh air, a fresh air treatment module for purifying the fresh air, and a fresh air heat and humidity treatment module for treating the fresh air.

[0014] As a further improvement to the above technical solution, the digital air conditioning unit includes an air conditioning fan for regulating the supply of air, an air conditioning air handling module for purifying the circulating air, and an air conditioning heat and humidity handling module for heat and humidity treatment of the circulating air.

[0015] As a further improvement to the above technical solution, a digital air supply unit is also included, which is connected between the main fresh air duct and the multiple intelligent fresh air terminals. The digital air supply unit includes an air supply fan for adjusting the air supply volume.

[0016] As a further improvement to the above technical solution, the digital air supply unit also includes an air supply heat and humidity treatment module for heat and humidity treatment of the supply air.

[0017] As a further improvement to the above technical solution, an intelligent control system is also included, which includes a fresh air unit control system, a supply air unit control system, and an air conditioning unit control system.

[0018] The fresh air handling unit control system includes a fresh air handling unit intelligent control cabinet, and a first supply air pressure sensor, a first inlet air temperature and humidity sensor, a first supply air temperature and humidity sensor, and an air quality sensor connected to the fresh air handling unit intelligent control cabinet. The fresh air handling unit intelligent control cabinet is connected to the fresh air fan, the fresh air handling module, and the fresh air heat and humidity handling module, respectively.

[0019] The air conditioning unit control system includes an air conditioning unit intelligent control cabinet, a second air supply pressure sensor, a second air inlet temperature sensor, and a second air supply temperature sensor connected to the air conditioning unit intelligent control cabinet. The air conditioning unit intelligent control cabinet is connected to the air conditioning fan and the air conditioning heat and humidity treatment module, respectively.

[0020] The air supply unit control system includes an air supply unit controller and a duct pressure sensor connected to the air supply unit controller. The air supply unit controller is connected to the air supply fan.

[0021] As a further improvement to the above technical solution, the intelligent fresh air terminal and the intelligent air supply terminal respectively include a wind speed sensor and an air volume adjustment mechanism.

[0022] As a further improvement to the above technical solution, the intelligent fresh air terminal and the intelligent air supply terminal respectively include a wind speed sensor and a terminal fan.

[0023] As a further improvement to the above technical solution, an intelligent control system is also included, which includes an intelligent terminal control system, comprising a terminal controller and a sensor group connected to the terminal controller.

[0024] As a further improvement to the above technical solution, the sensor group includes one or more of the following: VOC sensor, CO2 sensor, temperature and humidity sensor, PM2.5 sensor, and differential pressure sensor.

[0025] Other features and advantages of this invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. Attached Figure Description

[0026] The present invention will be further described below with reference to the accompanying drawings and embodiments;

[0027] Figure 1 This is a schematic diagram of the structure of the VAV air conditioning system provided by this utility model, in Embodiment 1. Figure 1 ;

[0028] Figure 2 This is a schematic diagram of the structure of the VAV air conditioning system provided by this utility model, in Embodiment 2. Figure 1 ;

[0029] Icon labels:

[0030] Digital fresh air handling unit 1; Digital air conditioning unit 2; Digital air supply unit 3; Intelligent air supply terminal 4; Intelligent fresh air terminal 5; Fresh air handling unit control system 6; Air supply unit control system 7; Air conditioning unit control system 8; Intelligent terminal control system 9; Inlet valve 10; Return air valve 11; Fresh air valve 12. Detailed Implementation

[0031] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0032] In the description of this utility model, it should be understood that the orientation descriptions, such as up, down, etc., are based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0033] In the description of this utility model, "multiple" refers to two or more. The use of "first" and "second" is for distinguishing technical features only and should not be construed as indicating or implying relative importance, or implicitly indicating the number of technical features or their sequential relationship.

[0034] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0035] The technical solution of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described below are some embodiments of this utility model, not all embodiments.

[0036] like Figure 1 and Figure 2 As shown, the present invention discloses a VAV air conditioning system based on temperature and humidity control technology, comprising: an intelligent fresh air terminal 5, an intelligent air supply terminal 4, a digital fresh air unit 1, and a digital air conditioning unit 2.

[0037] At least one digital fresh air unit 1 is provided. In practical applications, the number of digital fresh air units 1 is set according to the fresh air volume requirements. The air outlet side of the digital fresh air unit 1 is connected to a fresh air main pipe. The fresh air main pipe is connected to multiple intelligent fresh air terminals 5 through fresh air branch pipes. The intelligent fresh air terminals 5 are located on the fresh air branch pipes in the work area and are responsible for adjusting the fresh air volume.

[0038] The digital air conditioning unit 2 is equipped with at least one return air valve 11 and a fresh air valve 12 on the air inlet side. The fresh air valve 12 is connected to the fresh air main pipe, and the return air valve 11 is connected to the return air pipe, which is connected to the work area. The air outlet side of the digital air conditioning unit 2 is connected to multiple intelligent air supply terminals 4 through the air supply pipe. The intelligent air supply terminals 4 are located on the air supply branch pipes in the work area and are responsible for delivering air from the digital air conditioning unit 2 to each work area as needed.

[0039] In use, the return air volume is adjusted by the return air valve 11, and the fresh air volume entering the digital air conditioning unit 2 is adjusted by the fresh air valve 12, so as to regulate the circulating air.

[0040] This invention divides the traditional VAV system, which handles both fresh and return air from a single device, into two independent systems: fresh air is handled by a digital fresh air handling unit 1, and recirculated air is handled by a digital air conditioning unit 2. One digital fresh air handling unit 1 corresponds to one digital air conditioning unit 2, or one digital fresh air handling unit 1 corresponds to multiple digital air conditioning units 2. In use, the digital fresh air handling unit 1 centrally collects and processes fresh air, which is then delivered to each floor or zone through the main fresh air duct. A portion of the fresh air is delivered to work areas requiring humidity and air quality control by intelligent fresh air terminals 5, while another portion of the fresh air enters the digital air conditioning unit 2 and, after being processed by the digital air conditioning unit 2, is delivered to work areas in open spaces via intelligent air supply terminals 4. The intelligent fresh air terminals 5 are located on the fresh air branch ducts in the work areas and are responsible for adjusting the fresh air volume; the intelligent air supply terminals 4 are located on the air supply ducts in the work areas and are responsible for delivering air from the digital air conditioning units 2 to each work area as needed.

[0041] This utility model's digital fresh air handling unit only handles the resistance of the main fresh air duct, completely changing the practice of selecting fan pressure based on the most unfavorable resistance of a branch duct. Due to the reduction in air pressure, duct leakage is significantly reduced, saving energy consumption in fresh air distribution. Furthermore, all the fresh air required by a building can be supplied by one or more digital fresh air handling units according to the building's structural characteristics, greatly simplifying the practice of dispersing fresh air machine rooms and units for fresh air supply, and facilitating construction and maintenance.

[0042] The digital fresh air handling unit 1 of this utility model includes a fresh air fan for regulating the supply of fresh air, a fresh air treatment module for purifying the fresh air, and a fresh air heat and humidity treatment module for heat and humidity treatment of the fresh air.

[0043] Among them, the fresh air fan adopts a digital EC fan or a variable frequency fan, which can automatically adjust the supply of fresh air according to the user's demand for fresh air and the change of the resistance of the fresh air supply duct. This can significantly save the cooling (heating) energy consumed in processing fresh air, resulting in significant energy savings.

[0044] The digital fresh air unit 1 of this utility model aims to ensure the quality of fresh air (air cleanliness, deodorization, addition of negative ions, etc.), and can also perform fresh air heat and humidity treatment (cooling and dehumidification, heating and humidification, heat recovery, etc.). Its cold and heat source can be a centralized cold and heat source, or an independent direct expansion cold and heat source, or a combination of a centralized cold and heat source and an independent direct expansion cold and heat source.

[0045] The digital fresh air unit 1 is responsible for dehumidifying the corresponding area, processing the outdoor fresh air to a certain humidity difference with the indoor air, and controlling the humidity and air quality of the working area by adjusting the air volume of the intelligent fresh air terminal 5 or the fresh air valve 12.

[0046] The digital air conditioning unit 2 of this utility model includes an air conditioning fan for regulating the supply of air, an air conditioning air handling module for purifying the circulating air, and an air conditioning heat and humidity handling module for heat and humidity handling of the circulating air.

[0047] The digital air conditioning unit 2 aims to ensure the quality of circulating air (air cleanliness, deodorization, addition of negative ions, etc.), while also having heat and humidity treatment functions (cooling, heating, etc.). Its cold and heat source can be a centralized cold and heat source, an independent direct expansion cold and heat source, or a combination of a centralized cold and heat source and an independent direct expansion cold and heat source.

[0048] The air conditioning fan uses a digital EC fan or a variable frequency fan, which can automatically adjust the supply of air according to the user's demand for circulating air volume and the change in the resistance of the main air supply pipe. This can significantly save the cooling (heating) energy consumed in handling return air, resulting in significant energy savings.

[0049] Furthermore, such as Figure 1 As shown, it also includes a digital air supply unit 3. The inlet of the digital air supply unit 3 is equipped with an air inlet valve 10. The digital air supply unit 3 is connected between the fresh air main pipe and the multiple intelligent fresh air terminals 5. The digital air supply unit 3 includes an air supply fan for adjusting the air supply volume. The digital air supply unit 3 mainly undertakes the secondary distribution of fresh air, delivering the fresh air from the digital fresh air unit 1 to the air inlet of each intelligent fresh air terminal 5 as needed, so as to deliver it to each working area.

[0050] The supply air fan uses an EC fan, which only bears the resistance of the supply air branch pipe. The total fresh air volume is adjusted according to the change in the resistance of the branch pipe, with an adjustment range of 0% to 100%.

[0051] In some embodiments, the digital air supply unit 3 further includes an air supply heat and humidity treatment module for heat and humidity treatment of the supply air. It is understood that a heat exchanger can be set as needed to perform heat and humidity treatment on the fresh air.

[0052] In some other embodiments, such as Figure 2 As shown, no digital air supply unit 3 is installed. The humidity and air quality of the working area are controlled by adjusting the air volume of the intelligent fresh air terminal 5 or the fresh air valve 12.

[0053] The intelligent fresh air terminal 5 and the intelligent air supply terminal 4 are divided into two categories based on their different principles: non-powered and powered.

[0054] The non-powered intelligent fresh air terminal 5 and the intelligent air supply terminal 4 each include a housing, a wind speed sensor, and an air volume adjustment mechanism.

[0055] The powered intelligent fresh air terminal 5 and the intelligent air supply terminal 4 each include a housing, a wind speed sensor, a terminal fan, and an electric airtight valve. The terminal fan is an EC fan.

[0056] The intelligent fresh air terminal 5 can deliver treated fresh air to various work areas as needed, based on humidity or air quality as the control target, or based on both humidity and air quality as the control target.

[0057] The intelligent air supply terminal 4 can deliver the treated circulating air to each work area as needed, based on the temperature control target.

[0058] The small work areas corresponding to the digital air conditioning unit 2 are equipped with intelligent fresh air terminal 5 and intelligent air supply terminal 4. The large work areas may be equipped with only intelligent air supply terminal 4 or both intelligent fresh air terminal 5 and intelligent air supply terminal 4, depending on the actual situation.

[0059] This utility model also includes an intelligent control system, which includes a fresh air unit control system 6, a supply air unit control system 7, an air conditioning unit control system 8, and an intelligent terminal control system 9. It can respectively realize the control of the digital fresh air unit 1, the digital supply air unit 3, the digital air conditioning unit 2, and the intelligent terminal, and can be incorporated into the BA system for centralized management by the central monitoring station.

[0060] The fresh air handling unit control system 6 includes a fresh air handling unit intelligent control cabinet, a first supply air pressure sensor, a first inlet air temperature and humidity sensor, a first supply air temperature and humidity sensor, and an air quality sensor, all connected to the fresh air handling unit intelligent control cabinet. The fresh air handling unit intelligent control cabinet is connected to the fresh air fan, the fresh air handling module, and the fresh air heat and humidity treatment module. The fresh air heat and humidity treatment module is equipped with an electric regulating valve for the water system or a communication component with its own cold and heat source system. It can automatically adjust the total fresh air volume through the fresh air fan according to changes in duct pressure, and automatically adjust the opening of the electric valve or the input ratio of the built-in cold and heat source system according to changes in supply air temperature and humidity to achieve control of supply air humidity. It can automatically perform real-time statistics of fresh air volume. The controller has a communication interface and can receive BA commands to realize remote start and stop of the unit.

[0061] The air conditioning unit control system 8 includes an intelligent control cabinet for the air conditioning unit, a second supply air pressure sensor, a second inlet air temperature sensor, and a second supply air temperature sensor connected to the intelligent control cabinet. The intelligent control cabinet is connected to the air conditioning fan and the air conditioning heat and humidity treatment module. The air conditioning heat and humidity treatment module is also equipped with an electric regulating valve for the water system or a communication component for its own cold and heat source system. It can automatically adjust the total air supply volume through the air conditioning fan according to changes in duct pressure; and automatically adjust the opening of the electric valve or the input ratio of the own cold and heat source system according to changes in supply air temperature to achieve supply air temperature control. It can automatically perform real-time statistics of supply air volume. The controller has a communication interface and can receive BA commands to realize remote start and stop of the unit.

[0062] The air supply unit control system 7 includes an air supply unit controller and a duct pressure sensor connected to the air supply unit controller. The air supply unit controller is connected to the air supply fan and can automatically adjust the air supply volume according to changes in duct pressure.

[0063] The intelligent fresh air terminal 5 and the intelligent air supply terminal 4 respectively include a wind speed sensor and an air volume adjustment mechanism.

[0064] The intelligent terminal control system 9 includes a terminal controller and a sensor group connected to the terminal controller. The sensor group includes one or more of the following: VOC sensor, CO2 sensor, temperature and humidity sensor, PM2.5 sensor, and differential pressure sensor. It can automatically adjust the fresh air volume of the fresh air terminal according to changes in indoor VOC and CO2 concentrations and humidity, and can automatically adjust the air supply volume of the air supply terminal according to changes in indoor temperature.

[0065] like Figure 1 As shown, the digital fresh air unit 1, digital air supply unit 3, and intelligent fresh air terminal 5 are connected in series when they are put into operation simultaneously. The opening / closing of the digital fresh air unit 1 and the digital air supply unit 3 is controlled by the signal of the air supply pressure sensor, and the opening / closing of the intelligent fresh air terminal 5 is controlled by the terminal controller by the signal of the sensor.

[0066] When the digital air conditioning unit 2 and the intelligent air supply terminal 4 are put into operation simultaneously, they are connected in series. The opening / closing of the digital air conditioning unit 2 is controlled by the signal of the air supply pressure sensor, and the opening / closing of the intelligent air supply terminal 4 is controlled by the terminal controller by the signal of the sensor.

[0067] like Figure 2 yes Figure 1 A simplified version of the embodiment, namely, a scheme in which one digital fresh air unit 1 corresponds to one digital air conditioning unit 2, and Figure 1 One embodiment is a digital fresh air unit 1 corresponding to two or more digital air conditioning units 2, and also includes a digital air supply unit 3 to undertake the secondary distribution of fresh air.

[0068] The small work areas corresponding to the digital air conditioning unit 2 are equipped with intelligent fresh air terminal 5 and intelligent air supply terminal 4. The large work areas may be equipped with only intelligent air supply terminal 4 or both intelligent fresh air terminal 5 and intelligent air supply terminal 4, depending on the actual situation.

[0069] This VAV air conditioning system effectively solves the problem of comprehensive control of temperature, humidity and air quality in VAV air conditioning systems. When a combination of centralized cold and heat source and independent direct expansion cold and heat source is adopted, the centralized cold and heat source can use low-grade energy, which can improve the energy efficiency of the refrigeration unit or heat pump, reduce the annual operating energy consumption of the air conditioning system by 20% to 25%, and achieve the goal of comprehensive control of temperature, humidity and air quality in VAV air conditioning systems.

[0070] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0071] The embodiments of the present utility model have been described in detail above with reference to the accompanying drawings. However, the present utility model is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present utility model.

Claims

1. A VAV air conditioning system based on temperature and humidity control technology, characterized in that, include: The intelligent fresh air terminal (5) is equipped with multiple units; The intelligent air supply terminal (4) is equipped with multiple units; The digital fresh air unit (1) is provided with at least one, and the air outlet side of the digital fresh air unit (1) is connected to a fresh air main pipe, and the fresh air main pipe is connected to multiple smart fresh air terminals (5) through fresh air branch pipes. The digital air conditioning unit (2) is provided with at least one return air valve (11) and fresh air valve (12) on the air inlet side. The fresh air valve (12) is connected to the fresh air main pipe, and the return air valve (11) is connected to the return air pipe. The air outlet side of the digital air conditioning unit (2) is connected to multiple intelligent air supply terminals (4) through the air supply pipe.

2. The VAV air conditioning system according to claim 1, characterized in that: The digital fresh air unit (1) includes a fresh air fan for regulating the supply of fresh air, a fresh air treatment module for purifying the fresh air, and a fresh air heat and humidity treatment module for heat and humidity treatment of the fresh air.

3. The VAV air conditioning system according to claim 2, characterized in that: The digital air conditioning unit (2) includes an air conditioning fan for regulating the supply of air, an air conditioning air handling module for purifying the circulating air, and an air conditioning heat and humidity handling module for heat and humidity treatment of the circulating air.

4. The VAV air conditioning system according to claim 3, characterized in that: It also includes a digital air supply unit (3), which is connected between the main fresh air duct and the multiple smart fresh air terminals (5). The digital air supply unit (3) includes an air supply fan for adjusting the air supply volume.

5. The VAV air conditioning system according to claim 4, characterized in that: The digital air supply unit (3) also includes an air supply heat and humidity treatment module for heat and humidity treatment of the air supply.

6. The VAV air conditioning system according to claim 4, characterized in that: It also includes an intelligent control system, which includes a fresh air handling unit control system (6), a supply air handling unit control system (7), and an air conditioning unit control system (8). The fresh air handling unit control system (6) includes a fresh air handling unit intelligent control cabinet, a first air supply pressure sensor, a first air inlet temperature and humidity sensor, a first air supply temperature and humidity sensor, and an air quality sensor connected to the fresh air handling unit intelligent control cabinet. The fresh air handling unit intelligent control cabinet is connected to the fresh air fan, the fresh air handling module, and the fresh air heat and humidity handling module, respectively. The air conditioning unit control system (8) includes an air conditioning unit intelligent control cabinet, a second air supply pressure sensor, a second air inlet temperature sensor, and a second air supply temperature sensor connected to the air conditioning unit intelligent control cabinet. The air conditioning unit intelligent control cabinet is connected to the air conditioning fan and the air conditioning heat and humidity treatment module, respectively. The air supply unit control system (7) includes an air supply unit controller and a duct pressure sensor connected to the air supply unit controller. The air supply unit controller is connected to the air supply fan.

7. The VAV air conditioning system according to claim 1, characterized in that: The intelligent fresh air terminal (5) and the intelligent air supply terminal (4) respectively include a wind speed sensor and an air volume adjustment mechanism.

8. The VAV air conditioning system according to claim 1, characterized in that: The intelligent fresh air terminal (5) and the intelligent air supply terminal (4) respectively include a wind speed sensor and a terminal fan.

9. The VAV air conditioning system according to any one of claims 7 or 8, characterized in that: It also includes an intelligent control system, which includes an intelligent terminal control system (9), which includes a terminal controller and a sensor group connected to the terminal controller.

10. The VAV air conditioning system according to claim 9, characterized in that: The sensor group includes one or more of the following: VOC sensor, CO2 sensor, temperature and humidity sensor, PM2.5 sensor, and differential pressure sensor.

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