A dual-temperature cold source heat and humidity decoupling control air conditioning system and a control method thereof

Abstract

The application provides a double-temperature cold source heat and humidity decoupling control air conditioning system and a control method thereof. A low-temperature cold water system is used to provide low-temperature cold water to a fresh air subsystem to cool and dehumidify an air conditioning room; and a high-temperature cold water system is used to provide high-temperature cold water to a terminal sensible heat exchange subsystem to dry and cool the air conditioning room. The low-temperature cold water system focuses on processing humidity load, part of sensible heat cold load and fresh air cold load, and through accurate control of the temperature and flow of the low-temperature cold water, the fresh air entering the air conditioning room can have appropriate humidity content and air volume, thereby meeting the strict requirements of indoor humidity. Meanwhile, the high-temperature cold water system is responsible for processing the remaining sensible heat cold load, and through adjustment of the temperature and flow of the high-temperature cold water and the indoor circulating air volume of the sensible heat exchange equipment, the temperature of the air conditioning room can be accurately controlled to be stable above the indoor dew point temperature, thereby avoiding dew condensation.

Description

Technical Field

[0001] This application relates to the field of air conditioning system technology, and in particular to an air conditioning system and control method with dual-temperature cold source heat and humidity decoupling control. Background Technology

[0002] In traditional air conditioning systems, temperature and humidity are often centrally controlled. This method makes it difficult to accurately meet the different indoor temperature and humidity requirements simultaneously. Especially in places with high temperature and humidity requirements, such as museums, archives, and precision manufacturing workshops, traditional air conditioning systems cannot effectively decouple temperature and humidity control, leading to unstable indoor environmental parameters that may adversely affect stored items or manufactured products. Summary of the Invention

[0003] The purpose of this application is to at least solve one of the aforementioned technical defects, particularly the technical defect that traditional air conditioning systems in the prior art cannot effectively decouple and control temperature and humidity, resulting in unstable indoor environmental parameters, which may have an adverse effect on stored items or manufactured products.

[0004] This application provides an air conditioning system with dual-temperature cold source heat and humidity decoupling control. The system includes a low-temperature chilled water system, a high-temperature chilled water system, and a temperature and humidity separate control air conditioning system. The temperature and humidity separate control air conditioning system includes a fresh air subsystem and a terminal sensible heat exchange subsystem.

[0005] The low-temperature chilled water system is connected to the fresh air subsystem, the high-temperature chilled water system is connected to the terminal sensible heat exchange subsystem, and both the fresh air subsystem and the terminal sensible heat exchange subsystem are connected to the air-conditioned room.

[0006] The low-temperature chilled water system is used to provide low-temperature chilled water to the fresh air subsystem so that the fresh air subsystem can bear the wet load, part of the sensible heat cooling load, and the fresh air cooling load of the air-conditioned room.

[0007] The high-temperature chilled water system is used to provide high-temperature chilled water to the terminal sensible heat exchange subsystem so that the terminal sensible heat exchange subsystem can bear the remaining sensible heat cooling load of the air-conditioned room.

[0008] Optionally, the low-temperature chilled water system includes a compressor, a throttle valve, a condenser, a first evaporator, a second evaporator, and a three-way refrigerant regulating valve;

[0009] The output end of the second evaporator is connected to the input end of the compressor, the output end of the compressor is connected to the input end of the condenser, and the output end of the condenser is connected to the input end of the first evaporator through the throttling valve;

[0010] One of the output terminals of the first evaporator is connected to the fresh air subsystem, and the other output terminal is split through the three-way refrigerant regulating valve, with one path connected to the input terminal of the second evaporator and the other path connected to the input terminal of the compressor.

[0011] Optionally, the fresh air subsystem includes a low-temperature chilled water pump, a first surface cooler, a three-way water regulating valve, and a fresh air fan;

[0012] The input end of the low-temperature chilled water pump is connected to the output end of the low-temperature chilled water system, and the output end is connected to one of the input ends of the first surface cooler. The other input end of the first surface cooler is connected to the output end of the fresh air fan.

[0013] One of the outputs of the first surface cooler is diverted by the three-way water regulating valve, one of which enters the high-temperature cold water system, and the other of which merges with the high-temperature return water of the high-temperature cold water system and enters the low-temperature cold water system.

[0014] The other output of the first surface cooler is connected to the air-conditioned room.

[0015] Optionally, the air-conditioned room includes a fan coil unit air-conditioned room, a radiant ceiling air-conditioned room, and a wall-mounted air-conditioned room with embedded cold water pipes;

[0016] The other output of the first surface cooler is divided into three paths, each of which enters the fan coil air-conditioned room, the radiant ceiling air-conditioned room, and the wall-mounted air-conditioned room with embedded cold water pipes, respectively.

[0017] Optionally, the high-temperature chilled water system includes a processing fan, a first sensible heat exchanger, a dehumidifying impeller, a second sensible heat exchanger, a third sensible heat exchanger, a second surface cooler, a cooling tower, and a three-way air regulating valve.

[0018] The processing fan is installed at the input end of the first sensible heat exchanger, and the output end of the first sensible heat exchanger is sequentially connected to the dehumidification rotor, the second sensible heat exchanger, the third sensible heat exchanger, and the second surface cooler, so as to transform the processing air sent in by the processing fan into dry air with ultra-low wet bulb temperature after four-stage cooling.

[0019] One of the input ends of the cooling tower is connected to the output end of the second surface cooler, and the other input end is connected to the terminal sensible heat exchange subsystem, so that the high-temperature return water of the air-conditioned room and the dry air with ultra-low wet bulb temperature exchange heat and mass to become the low-temperature supply water of the air-conditioned room.

[0020] One of the outputs of the cooling tower is split by the three-way air regulating valve, with one path entering the third sensible heat exchanger and the other path mixing with the return air from the third sensible heat exchanger before being sent to the first sensible heat exchanger.

[0021] Optionally, the low-temperature chilled water system includes at least a condenser and a second evaporator, and the high-temperature chilled water system further includes a regenerative fan;

[0022] The regeneration fan is installed at the input end of the second sensible heat exchanger, and the output end of the second sensible heat exchanger is connected to the other input end of the condenser, the dehumidifying impeller, and the second evaporator to regenerate, heat, and recover heat from the regeneration air supplied by the regeneration fan.

[0023] Optionally, the high-temperature chilled water system includes at least a cooling tower, and the terminal sensible heat exchange subsystem includes a high-temperature chilled water pump and sensible heat exchange equipment, wherein the sensible heat exchange equipment includes a fan coil unit, a radiant ceiling, and a wall with embedded chilled water pipes.

[0024] The input end of the high-temperature chilled water pump is connected to the output end of the fan coil unit, the radiant ceiling and the wall-mounted embedded chilled water pipe, respectively. The output end of the high-temperature chilled water pump is connected to another input end of the cooling tower, which is used to send the high-temperature return water from the air-conditioned room into the cooling tower.

[0025] The high-temperature cold water output from the cooling tower is sent to the fan coil unit, the radiant ceiling, and the wall with embedded cold water pipes.

[0026] This application also provides a dual-temperature cold source heat and humidity decoupling control method, applied to an air conditioning system with dual-temperature cold source heat and humidity decoupling control as described in any of the above embodiments, the method comprising:

[0027] The system acquires control commands input by the user for the air-conditioned room, including humidity control commands and temperature control commands.

[0028] If the control command is a humidity control command, then the moisture content and air volume of the fresh air supplied by the air conditioning system are adjusted according to the humidity control command.

[0029] If the control command is a temperature control command, then the indoor air circulation volume of the sensible heat exchanger in the air-conditioned room of the air conditioning system is adjusted according to the temperature control command.

[0030] Optionally, the air conditioning system includes at least a low-temperature chilled water system and a temperature and humidity control air conditioning system, wherein the temperature and humidity control air conditioning system includes at least a fresh air subsystem;

[0031] The adjustment of the moisture content and air volume of the fresh air supplied by the air conditioning system according to the humidity control command includes:

[0032] The low-temperature chilled water inlet temperature and flow rate of the low-temperature chilled water system and the fresh air subsystem are controlled according to the humidity control command to adjust the humidity content of the fresh air supplied by the air conditioning system. The low-temperature chilled water system includes a compressor; when the system cooling load increases, the operating frequency of the compressor increases; when the system cooling load decreases, the operating frequency of the compressor decreases to maintain the control stability of the low-temperature chilled water inlet temperature. The fresh air subsystem includes a low-temperature chilled water pump, and the low-temperature chilled water inlet flow rate is controlled by the low-temperature chilled water pump.

[0033] The rotation speed of the fresh air fan in the fresh air subsystem is controlled according to the humidity control command, so as to adjust the air volume of the fresh air supply of the air conditioning system.

[0034] Optionally, the air conditioning system includes at least a compressor, a high-temperature chilled water system, and a temperature and humidity control air conditioning system, wherein the temperature and humidity control air conditioning system includes at least a terminal sensible heat exchange subsystem.

[0035] The step of adjusting the indoor air circulation volume of the sensible heat exchanger in the air-conditioned room according to the temperature control command includes:

[0036] The high-temperature chilled water inlet temperature and flow rate of the high-temperature chilled water system and the terminal sensible heat exchange subsystem are controlled according to the temperature control command to keep the indoor temperature of the air-conditioned room stable above the indoor dew point temperature and prevent condensation in the air-conditioned room; wherein, the terminal sensible heat exchange subsystem includes a high-temperature chilled water pump, and the high-temperature chilled water inlet flow rate is controlled by the high-temperature chilled water pump.

[0037] When the system cooling load increases, the operating frequency of the compressor is increased; when the system cooling load decreases, the operating frequency of the compressor is decreased, in order to maintain the control stability of the high-temperature chilled water inlet temperature.

[0038] Based on the temperature control command and the actual indoor temperature of the air-conditioned room, the indoor circulating air volume of the sensible heat exchanger in the terminal sensible heat exchange subsystem is adjusted.

[0039] As can be seen from the above technical solutions, the embodiments of this application have the following advantages:

[0040] This application provides an air conditioning system and its control method with decoupled temperature and humidity control for dual-temperature cold sources. The system includes a low-temperature chilled water system, a high-temperature chilled water system, and a temperature and humidity separately controlled air conditioning system. The temperature and humidity separately controlled air conditioning system includes a fresh air subsystem and a terminal sensible heat exchange subsystem. The low-temperature chilled water system is connected to the fresh air subsystem, and the high-temperature chilled water system is connected to the terminal sensible heat exchange subsystem. Both the fresh air subsystem and the terminal sensible heat exchange subsystem are connected to the air-conditioned room. The low-temperature chilled water system provides low-temperature chilled water to the fresh air subsystem to handle the humidity load, part of the sensible heat load, and the fresh air cooling load of the air-conditioned room. The high-temperature chilled water system provides high-temperature chilled water to the terminal sensible heat exchange subsystem to handle the remaining sensible heat load of the air-conditioned room. This design effectively achieves decoupled temperature and humidity control. The low-temperature chilled water system focuses on handling the humidity load and the fresh air cooling load. By precisely controlling the temperature and flow rate of the low-temperature chilled water, it ensures that the fresh air entering the air-conditioned room has a suitable humidity content, thereby meeting the stringent indoor humidity requirements. Meanwhile, the high-temperature chilled water system is responsible for handling the remaining sensible heat load. By adjusting the temperature and flow rate of the high-temperature chilled water, as well as the indoor circulating air volume of the sensible heat exchange equipment, the temperature of the air-conditioned room can be precisely controlled to keep it stable above the indoor dew point temperature and prevent condensation. Attached Figure Description

[0041] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0042] Figure 1 A schematic diagram of the structure of an air conditioning system with dual-temperature cold source heat and humidity decoupling control provided in an embodiment of this application;

[0043] Figure 2 The diagram illustrates the specific structural connections of the air conditioning system provided in this application embodiment;

[0044] Figure 3 A schematic flowchart of a dual-temperature cold source heat and humidity decoupling control method provided in an embodiment of this application;

[0045] Figure 2In the diagram, 1-processing fan; 2-dehumidifying rotor; 3-second sensible heat exchanger; 4-third sensible heat exchanger; 5-second surface cooler; 6-cooling tower; 7-regenerating fan; 8-condenser; 9-second evaporator; 10-compressor; 11-throttle valve; 12-first evaporator; 13-three-way refrigerant regulating valve; 14-low temperature chilled water pump; 15-first surface cooler; 16-three-way water regulating valve; 17-fresh air fan; 18-high temperature chilled water pump; 19-fan coil unit; 20-radiant ceiling; 21-wall with embedded chilled water pipe; 22-air-conditioned room; 23-first sensible heat exchanger; 24-three-way air regulating valve. Detailed Implementation

[0046] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0047] In one embodiment, such as Figure 1 As shown, Figure 1 This is a schematic diagram of the structure of an air conditioning system with dual-temperature cold source heat and humidity decoupling control provided in an embodiment of this application; this application provides an air conditioning system with dual-temperature cold source heat and humidity decoupling control, the system including a low-temperature chilled water system, a high-temperature chilled water system and a temperature and humidity separate control air conditioning system, the temperature and humidity separate control air conditioning system including a fresh air subsystem and a terminal sensible heat exchange subsystem.

[0048] The low-temperature chilled water system is connected to the fresh air subsystem, the high-temperature chilled water system is connected to the terminal sensible heat exchange subsystem, and both the fresh air subsystem and the terminal sensible heat exchange subsystem are connected to the air-conditioned room.

[0049] The low-temperature chilled water system is used to provide low-temperature chilled water to the fresh air subsystem so that the fresh air subsystem can bear the moisture load, part of the sensible heat cooling load, and the fresh air cooling load of the air-conditioned room.

[0050] The high-temperature chilled water system is used to provide high-temperature chilled water to the terminal sensible heat exchange subsystem so that the terminal sensible heat exchange subsystem can bear the remaining sensible heat cooling load of the air-conditioned room.

[0051] In this embodiment, as Figure 1As shown, the air conditioning system of this application includes a low-temperature chilled water system, a high-temperature chilled water system, and a temperature and humidity control air conditioning system. The temperature and humidity control air conditioning system is further subdivided into a fresh air subsystem and a terminal sensible heat exchange subsystem. The low-temperature chilled water system mainly consists of key components such as a compressor, expansion valve, condenser, evaporator, and refrigerant regulating valve. These components work together to ensure that the low-temperature chilled water system can stably supply the required low-temperature chilled water to the fresh air subsystem. The fresh air subsystem uses the received low-temperature chilled water to cool and dehumidify the fresh air, so as to accurately control the moisture content and air volume of the fresh air entering the air-conditioned room, thereby effectively undertaking the moisture load, part of the sensible heat cooling load, and the fresh air cooling load of the air-conditioned room.

[0052] The high-temperature chilled water system mainly consists of core components such as processing fans, sensible heat exchangers, dehumidifying impellers, surface coolers, cooling towers, and air regulating valves. These components work in precise coordination to ensure a stable supply of high-temperature chilled water to the terminal sensible heat exchange subsystems, which then handle the remaining sensible heat load of the air-conditioned rooms. Specifically, the processing fans deliver processed air to the sensible heat exchangers for initial cooling. The air then undergoes further dehumidification via the dehumidifying impeller, followed by deep cooling through various stages of sensible heat exchangers and surface coolers, ultimately transforming it into dry air with an ultra-low wet-bulb temperature. Simultaneously, the cooling tower utilizes the high-temperature return water from the air-conditioned rooms to exchange heat and mass with the dry air, producing high-temperature chilled water and high-humidity exhaust air. Air is then recycled through air regulating valves, improving system efficiency and ensuring stable temperature control in the air-conditioned rooms.

[0053] It is understood that the low-temperature chilled water provided by the low-temperature chilled water system in this application refers to chilled water with a relatively low temperature used for specific cooling and dehumidification purposes, such as chilled water at around 7°C. In practical applications, this low-temperature chilled water is usually set within a temperature range that meets the needs of the fresh air subsystem for handling moisture load, part of the sensible heat cooling load, and fresh air cooling load. The specific setting can be determined according to the actual situation and is not limited here. By precisely controlling the temperature and flow rate of the low-temperature chilled water, the fresh air subsystem in this application can effectively regulate the moisture content and air volume of the fresh air entering the air-conditioned room, ensuring a stable and comfortable indoor humidity environment. At the same time, this design also allows the low-temperature chilled water system and the high-temperature chilled water system to each undertake different heat load handling tasks, achieving decoupled control of temperature and humidity, and improving the overall energy efficiency of the air conditioning system and the accuracy of indoor environmental control.

[0054] The high-temperature chilled water provided by the high-temperature chilled water system in this application refers to chilled water with a relatively high temperature, mainly used to handle the residual sensible heat cooling load of the air-conditioned room. The temperature range is generally between 15℃ and 20℃, and the specific temperature can be flexibly adjusted according to the actual needs of the air-conditioned room and the system design, without limitation. This high-temperature chilled water exchanges heat with the air-conditioned room through the terminal sensible heat exchange subsystem, effectively removing excess heat from the room and ensuring that the indoor temperature remains stable within a comfortable range. Simultaneously, since the high-temperature chilled water does not participate in the handling of the moisture load, it avoids the problem of dry indoor air caused by excessive dehumidification, improving the overall comfort and energy efficiency ratio of the air conditioning system.

[0055] The fresh air subsystem of this application is primarily responsible for processing the fresh air entering the air-conditioned room. It cools and dehumidifies the fresh air using low-temperature chilled water to precisely control the moisture content and airflow. This not only meets the stringent indoor humidity requirements but also effectively handles a portion of the sensible heat load and the fresh air cooling load, providing a comfortable indoor air environment. The terminal sensible heat exchange subsystem utilizes high-temperature chilled water for heat exchange with the air-conditioned room, primarily handling the remaining sensible heat load. By adjusting the temperature and flow rate of the high-temperature chilled water, as well as the indoor circulating airflow of the sensible heat exchange equipment, the temperature of the air-conditioned room can be precisely controlled, stabilizing it above the indoor dew point temperature to prevent condensation and ensure indoor temperature comfort and stability. This dual-temperature cold source decoupled heat and humidity control design allows the low-temperature and high-temperature chilled water systems to focus on handling different heat loads, achieving independent temperature and humidity control. This not only improves the overall energy efficiency of the air conditioning system but also significantly enhances the control precision of the indoor environment, providing people with a more comfortable and healthy living and working environment.

[0056] In one embodiment, such as Figure 2 As shown, Figure 2 The diagram shows the specific structural connection of the air conditioning system provided in the embodiment of this application; the low-temperature chilled water system may include a compressor 10, a throttle valve 11, a condenser 8, a first evaporator 12, a second evaporator 9, and a three-way refrigerant regulating valve 13.

[0057] The output end of the second evaporator 9 is connected to the input end of the compressor 10, the output end of the compressor 10 is connected to the input end of the condenser 8, and the output end of the condenser 8 is connected to the input end of the first evaporator 12 through the throttle valve 11.

[0058] One of the output terminals of the first evaporator 12 is connected to the fresh air subsystem, and the other output terminal is split through the three-way refrigerant regulating valve 13, with one path connected to the input terminal of the second evaporator 9 and the other path connected to the input terminal of the compressor 10.

[0059] In this embodiment, the working process of the low-temperature chilled water system is as follows: Low-temperature, low-pressure gaseous refrigerant from the second evaporator 9 is drawn into the compressor 10. The compressor 10 compresses the low-temperature, low-pressure gaseous refrigerant into a high-temperature, high-pressure gaseous refrigerant, which is then sent to the condenser 8. Inside the condenser 8, the high-temperature, high-pressure gaseous refrigerant exchanges heat with the outside air, releasing heat and condensing into a high-temperature, high-pressure liquid refrigerant. Next, the liquid refrigerant, through the adiabatic throttling effect of the expansion valve 11, becomes a low-temperature, low-pressure liquid refrigerant and enters the first evaporator 12. Inside the first evaporator 12, the low-temperature, low-pressure liquid refrigerant absorbs heat from the fresh air supplied by the fresh air subsystem and evaporates into a low-temperature, low-pressure gaseous refrigerant, thereby achieving cooling and dehumidification of the fresh air.

[0060] Meanwhile, part of the low-temperature, low-pressure gaseous refrigerant output from the first evaporator 12 is diverted through the three-way refrigerant regulating valve 13 and merges with the outlet refrigerant of the second evaporator 9, thus returning to the input end of the compressor 10 to complete a refrigeration cycle; the other part enters the second evaporator 9 to continue absorbing heat and evaporating, so as to further enhance the refrigeration effect of the low-temperature chilled water system.

[0061] With this design, the low-temperature chilled water system can stably supply the required low-temperature chilled water to the fresh air subsystem, ensuring that the fresh air subsystem can effectively handle the humidity load, part of the sensible heat cooling load, and the fresh air cooling load of the air-conditioned room.

[0062] In one embodiment, the fresh air subsystem may include a low-temperature chilled water pump 14, a first surface cooler 15, a three-way water regulating valve 16, and a fresh air fan 17.

[0063] The input end of the low-temperature chilled water pump 14 is connected to the output end of the low-temperature chilled water system, and the output end is connected to one of the input ends of the first surface cooler 15. The other input end of the first surface cooler 15 is connected to the output end of the fresh air fan 17.

[0064] One of the output terminals of the first surface cooler 15 is split by the three-way water regulating valve 16, one of which enters the high-temperature cold water system, and the other of which merges with the high-temperature return water of the high-temperature cold water system and enters the low-temperature cold water system.

[0065] The other output terminal of the first surface cooler 15 is connected to the air-conditioned room 22.

[0066] In this embodiment, the workflow of the fresh air subsystem is as follows: the low-temperature chilled water pump 14 delivers the low-temperature chilled water output from the low-temperature chilled water system to the first surface cooler 15. Simultaneously, the fresh air fan 17 delivers outdoor fresh air into the first surface cooler 15. Inside the first surface cooler 15, the low-temperature chilled water and fresh air exchange heat, cooling and dehumidifying the fresh air, effectively regulating its moisture content and temperature. After heat exchange, a portion of the low-temperature chilled water is diverted through the three-way water regulating valve 16 into the high-temperature chilled water system, participating in its circulation; the other portion merges with the high-temperature return water from the high-temperature chilled water system and returns to the low-temperature chilled water system, achieving the recycling of chilled water. The cooled and dehumidified fresh air is then delivered to the air-conditioned room, providing a comfortable, dry, and temperature-appropriate air environment, effectively handling the humidity load, part of the sensible heat cooling load, and the fresh air cooling load of the air-conditioned room 22. This design ensures the stable and efficient operation of the fresh air subsystem, providing strong support for the decoupled temperature and humidity control of the entire air conditioning system.

[0067] Furthermore, such as Figure 2 As shown, in this application, the low-temperature chilled water, after being diverted through the three-way water regulating valve 16, enters the high-temperature chilled water system and is then transported to the second surface cooler 5 of the high-temperature chilled water system. There, it merges with the high-temperature return water from the second surface cooler 5 and enters the first evaporator 12 of the low-temperature chilled water system. This design creates an effective water circulation linkage between the low-temperature and high-temperature chilled water systems. On the high-temperature chilled water system side, the second surface cooler 5 utilizes the low-temperature chilled water diverted from the fresh air subsystem to further cool the processed air. Simultaneously, its own high-temperature return water merges with the low-temperature chilled water, and the resulting mixed water flows back into the first evaporator 12 of the low-temperature chilled water system. Inside the first evaporator 12, the heat of the mixed water is absorbed by the refrigerant, causing it to cool down. Subsequently, it is pumped back into the low-temperature chilled water system for recycling. By precisely adjusting the three-way water regulating valve 16, this application can flexibly control the amount of low-temperature chilled water entering the high-temperature chilled water system according to actual needs. This ensures that the high-temperature chilled water system can effectively handle the remaining sensible heat load, while also achieving efficient operation of the low-temperature chilled water system. This avoids the waste of cooling capacity and further improves the energy efficiency and stability of the entire dual-temperature cold source heat and humidity decoupling control air conditioning system.

[0068] In one embodiment, the air-conditioned room 22 may include a fan coil air-conditioned room, a radiant ceiling air-conditioned room, and a wall-mounted air-conditioned room with embedded cold water pipes.

[0069] The other output of the first surface cooler 15 is divided into three paths, each of which enters the fan coil air-conditioned room, the radiant ceiling air-conditioned room, and the wall-mounted air-conditioned room with embedded cold water pipes, respectively.

[0070] In this embodiment, as Figure 2As shown, the fresh air processed by the first surface cooler is precisely divided into three paths, which are then delivered to different types of air-conditioned rooms. One path enters a fan coil unit air-conditioned room, where the cooling and dehumidified air is evenly distributed throughout the room through the circulation of the fan coil unit, effectively regulating indoor temperature and humidity. Another path enters a radiant ceiling-mounted air-conditioned room, where radiant heat exchange is achieved through chilled water pipes laid within the ceiling, providing quiet and comfortable cooling while avoiding the drafty feeling that traditional air conditioners may produce. The third path enters a wall-mounted air-conditioned room with embedded chilled water pipes, where heat exchange occurs between the chilled water pipes embedded in the wall and the indoor air, achieving uniform cooling of the room and maintaining a stable indoor temperature.

[0071] This branched air supply design allows the system to provide customized cooling supply solutions based on the characteristics and needs of different types of air-conditioned rooms, further enhancing the system's flexibility and applicability. Simultaneously, each fresh air intake undergoes cooling and dehumidification treatment by the first surface cooler 15 before entering the room, ensuring dry and comfortable indoor air and effectively preventing condensation in the air-conditioned room 22, thus providing a healthier and more pleasant living and working environment for occupants.

[0072] In one embodiment, the high-temperature chilled water system may include a processing fan 1, a first sensible heat exchanger 23, a dehumidifying impeller 2, a second sensible heat exchanger 3, a third sensible heat exchanger 4, a second surface cooler 5, a cooling tower 6, and a three-way air regulating valve 24.

[0073] The processing fan 1 is installed at the input end of the first sensible heat exchanger 23. The output end of the first sensible heat exchanger 23 is sequentially connected to the dehumidification rotor 2, the second sensible heat exchanger 3, the third sensible heat exchanger 4, and the second surface cooler 5, so as to transform the processing air sent in by the processing fan 1 into dry air with an ultra-low wet bulb temperature after four-stage cooling.

[0074] One input end of the cooling tower 6 is connected to the output end of the second surface cooler 5, and the other input end is connected to the terminal sensible heat exchange subsystem, so that the high-temperature return water of the air-conditioned room and the dry air with ultra-low wet bulb temperature exchange heat and mass to become the low-temperature water supply of the air-conditioned room 22.

[0075] One of the outputs of the cooling tower 6 is split by the three-way air regulating valve 24. One stream enters the third sensible heat exchanger 4, while the other stream mixes with the return air from the third sensible heat exchanger 4 and is then sent to the first sensible heat exchanger 23.

[0076] In this embodiment, the working process of the high-temperature chilled water system is as follows: the processed air is driven by the processing fan 1 and enters the first sensible heat exchanger 23. After being cooled down, it enters the processing area of ​​the dehumidification rotor 2. After being adsorbed by the desiccant, it becomes high-temperature and low-humidity processed air. Then it enters the second sensible heat exchanger 3. After being cooled down to a constant humidity, it enters the third sensible heat exchanger 4 and exchanges sensible heat with the exhaust air of the cooling tower 6 at a lower temperature. The temperature is further reduced. Then it enters the second surface cooler 5. The air with reduced temperature exchanges heat with the low-temperature chilled water diverted from the fresh air subsystem. After being cooled down again (fourth time), it becomes dry air with an ultra-low wet-bulb temperature.

[0077] Furthermore, the dried air is fed into cooling tower 6, where it undergoes heat and mass exchange with the high-temperature return water from air-conditioned room 22. The high-temperature return water transfers heat to the dried air, lowering its own temperature to become the low-temperature supply water for air-conditioned room 22, thus achieving recycling. One of the outputs of cooling tower 6 is split via a three-way air regulating valve 24. One path of high-humidity exhaust air enters the third sensible heat exchanger 4, where it exchanges sensible heat with the processed air, further enhancing the cooling effect. The other path of high-humidity exhaust air mixes with the return air from the third sensible heat exchanger 4, and the mixed air is then fed into the first sensible heat exchanger 23, where its temperature is further increased before being discharged from the system.

[0078] This design not only achieves four-stage cooling of the processed air by the high-temperature chilled water system, ensuring that the processed air is transformed into dry air with an ultra-low wet-bulb temperature, but also realizes effective heat transfer and air recycling through cooling tower 6, improving the overall energy efficiency and stability of the system. Meanwhile, the precise adjustment of the three-way air regulating valve 24 allows the system to flexibly control the amount of air entering each sensible heat exchanger according to actual needs, further optimizing the system's operating performance.

[0079] In one embodiment, the low-temperature chilled water system includes at least a condenser 8 and a second evaporator 9, and the high-temperature chilled water system further includes a regeneration fan 7.

[0080] The regeneration fan 7 is installed at the input end of the second sensible heat exchanger 3. The output end of the second sensible heat exchanger 3 is connected to the other input end of the condenser 8, the dehumidifying rotor 2, and the second evaporator 9, so as to regenerate and heat recover the regeneration air supplied by the regeneration fan 7.

[0081] In this embodiment, regenerated air, driven by the regeneration fan 7, enters the second sensible heat exchanger 3, where it exchanges sensible heat with the exhaust air from the processing zone of the dehumidifying impeller 2, which has a higher temperature. After its temperature rises, it enters the condenser 8, where it is further heated to the high-temperature regeneration temperature required for the regeneration zone of the dehumidifying impeller 2, thus achieving effective utilization of waste heat and reducing external energy input. This high-temperature regenerated air enters the regeneration zone of the dehumidifying impeller 2, where it desorbs the saturated desiccant, becoming high-humidity regenerated air for exhaust. Finally, it is sent to the second evaporator 9, where its heat is further recovered before being discharged from the system.

[0082] Through this design, regenerated air achieves effective heat recovery and regeneration exhaust processes in the high-temperature chilled water system. The regenerated air first absorbs heat from the exhaust air in the second sensible heat exchanger 3, raising its temperature. This process not only increases the temperature of the regenerated air but also contributes to the regeneration effect of the subsequent dehumidification rotor 2. Subsequently, the regenerated air enters the condenser 8, where it is heated to the regeneration temperature required for dehumidification, ensuring that the desiccant in the regeneration zone of the dehumidification rotor 2 can be fully desorbed, restoring its moisture absorption capacity.

[0083] In the regeneration zone of dehumidifying rotor 2, high-temperature regeneration air desorbs the saturated desiccant, converting the adsorbed moisture into high-humidity exhaust air. This process not only regenerates the desiccant but also ensures the continuous and efficient operation of dehumidifying rotor 2. Finally, the high-humidity exhaust air is sent to the second evaporator 9, where heat exchange with the low-temperature refrigerant further recovers the heat, reducing system energy consumption and improving overall energy efficiency.

[0084] Furthermore, this design allows the high-temperature chilled water system to flexibly respond to different operating conditions. By adjusting the speed of the regeneration fan 7 and the heating power of the condenser 8, the system can precisely control the temperature and flow rate of the regenerated air, thereby optimizing the regeneration effect of the dehumidification rotor 2. At the same time, the heat recovery function of the second evaporator 9 further improves the system's energy efficiency ratio, enabling the entire dual-temperature cold source heat and humidity decoupled control air conditioning system to achieve efficient energy utilization while providing a comfortable indoor environment.

[0085] In one embodiment, the high-temperature chilled water system includes at least a cooling tower 6, and the terminal sensible heat exchange subsystem includes a high-temperature chilled water pump 18 and a sensible heat exchange device, wherein the sensible heat exchange device includes a fan coil unit 19, a radiant ceiling 20, and a wall 21 with embedded chilled water pipes.

[0086] The input end of the high-temperature cold water pump 18 is connected to the output ends of the fan coil unit 19, the radiant ceiling 20 and the wall with embedded cold water pipe 21 respectively. The output end of the high-temperature cold water pump 18 is connected to the other input end of the cooling tower 6, which is used to send the high-temperature return water of the air-conditioned room 22 into the cooling tower 6.

[0087] The high-temperature cold water output from the cooling tower 6 is sent to the fan coil unit 19, the radiant ceiling 20, and the wall with embedded cold water pipes 21, respectively.

[0088] In this embodiment, after the high-temperature chilled water pump 18 starts, it extracts the high-temperature return water from the air-conditioned room 22, which has heated up due to absorbing indoor heat, and transports it to the cooling tower 6 through pipelines. Inside the cooling tower 6, the high-temperature return water exchanges heat with the low-temperature air introduced from other parts of the high-temperature chilled water system, releasing heat and lowering its temperature, thus transforming into high-temperature chilled water. Subsequently, this cooled high-temperature chilled water is respectively transported to the fan coil unit 19, the radiant ceiling 20, and the wall with embedded chilled water pipes 21.

[0089] Specifically, within the fan coil unit 19, high-temperature chilled water exchanges heat with indoor air, absorbing heat from the air and lowering the indoor air temperature. Simultaneously, the fan blows the treated chilled air into the room, achieving a cooling effect. In the radiant ceiling 20, high-temperature chilled water radiates cooling energy into the room through chilled water pipes laid within the ceiling, providing quiet and comfortable cooling while avoiding the drafty feeling that traditional air conditioners may produce. In the wall with embedded chilled water pipes 21, high-temperature chilled water exchanges heat with indoor air through chilled water pipes embedded within the wall, achieving uniform cooling of the room and maintaining a stable indoor temperature.

[0090] With this design, the terminal sensible heat exchange subsystem can efficiently utilize the cooling capacity provided by the high-temperature chilled water system to meet the sensible heat cooling load requirements of different types of air-conditioned rooms. At the same time, it realizes the recycling of cooling capacity and improves the energy efficiency and operational stability of the entire dual-temperature cold source heat and humidity decoupled control air conditioning system.

[0091] The dual-temperature cold source heat and humidity decoupling control method provided in the embodiments of this application is described below. The dual-temperature cold source heat and humidity decoupling control method described below can be referred to in correspondence with the air conditioning system with dual-temperature cold source heat and humidity decoupling control described above.

[0092] In one embodiment, such as Figure 3 As shown, Figure 3 This application provides a flowchart illustrating a dual-temperature cold source heat and humidity decoupling control method according to an embodiment of the present application. The application also provides a dual-temperature cold source heat and humidity decoupling control method, applied to an air conditioning system with dual-temperature cold source heat and humidity decoupling control as described in any of the above embodiments. The method may include:

[0093] S110: Obtain the control commands input by the user for the air-conditioned room, the control commands including humidity control commands and temperature control commands.

[0094] S120: If the control command is a humidity control command, then the moisture content and air volume of the fresh air supplied by the air conditioning system are adjusted according to the humidity control command.

[0095] S130: If the control command is a temperature control command, then the indoor air circulation volume of the sensible heat exchanger in the air-conditioned room of the air-conditioned system is adjusted according to the temperature control command.

[0096] In this embodiment, after receiving a control command input by the user for the air-conditioned room, the application first determines the type of the command. If the determination result is a humidity control command, the application will respond immediately by precisely controlling the indoor humidity by adjusting the moisture content and airflow of the fresh air supply. Specifically, the application can adjust the degree of heat exchange between the low-temperature chilled water and the fresh air in the fresh air subsystem according to the target humidity value in the humidity control command, thereby changing the moisture content of the fresh air; at the same time, by adjusting the speed of the fresh air fan, the application controls the airflow of the fresh air entering the air-conditioned room to ensure that the indoor humidity is maintained within the comfortable range set by the user.

[0097] If the determination result is a temperature control command, this application will adjust the indoor air circulation volume of the sensible heat exchange equipment in the air-conditioned room according to the command. For example, when the user wants to lower the indoor temperature, this application can increase the indoor air circulation volume of sensible heat exchange equipment such as fan coil units, radiant ceilings, or walls with embedded chilled water pipes in the air-conditioned room to accelerate the heat exchange between indoor air and high-temperature chilled water, thereby quickly lowering the indoor temperature; conversely, when the user wants to raise the indoor temperature, this application can decrease the indoor air circulation volume to slow down the heat exchange rate, allowing the indoor temperature to gradually rise back to the value set by the user.

[0098] By employing this dual-temperature cold source heat and humidity decoupling control method, this application enables independent and precise control of humidity and temperature in air-conditioned rooms, meeting the personalized needs of different users in different scenarios, while improving the energy efficiency and operational stability of the air conditioning system.

[0099] In one embodiment, the air conditioning system includes at least a low-temperature chilled water system and a temperature and humidity control air conditioning system, wherein the temperature and humidity control air conditioning system includes at least a fresh air subsystem.

[0100] S120 may include adjusting the moisture content and air volume of the fresh air supplied by the air conditioning system according to the humidity control command, which may include:

[0101] S121: Control the low-temperature chilled water inlet temperature and low-temperature chilled water inlet flow rate of the low-temperature chilled water system and the fresh air subsystem according to the humidity control command, so as to adjust the humidity content of the fresh air supplied by the air conditioning system.

[0102] S122: Control the rotation speed of the fresh air fan in the fresh air subsystem according to the humidity control command, so as to adjust the air volume of the fresh air supply of the air conditioning system.

[0103] In this embodiment, when the present application receives a humidity control command, it will activate a dual adjustment mechanism. First, regarding the adjustment of the humidity content of the fresh air supply, the present application can precisely adjust the heat exchange intensity between the fresh air and the chilled water by controlling the temperature and flow rate of the chilled water supplied by the low-temperature chilled water system to the fresh air subsystem.

[0104] Specifically, to reduce indoor humidity, this application will lower the inlet temperature of the low-temperature chilled water or increase the inlet flow rate to enhance the cooling and dehumidification effect of the fresh air; conversely, it will increase the inlet temperature of the low-temperature chilled water or decrease the inlet flow rate to avoid excessive dehumidification. Secondly, regarding the adjustment of the fresh air supply airflow, this application can dynamically adjust the amount of fresh air entering the air-conditioned room by controlling the speed of the fresh air fan using a frequency converter. When the indoor humidity is high, the fan speed is increased to increase the fresh air volume and accelerate the removal of moisture; when the indoor humidity is close to the set value, the fan speed is reduced to decrease the fresh air volume and maintain stable humidity.

[0105] In one specific implementation, when adjusting the moisture content of the fresh air supply, this application can reduce the low-temperature chilled water inlet temperature of the first surface cooler 15 or increase the low-temperature chilled water inlet flow rate while keeping the fresh air supply volume constant (i.e., keeping the speed of the fresh air fan 17 constant). This reduces the moisture content of the fresh air supply while lowering its temperature. It is understood that the low-temperature chilled water inlet flow rate of the first surface cooler 15 is controlled by the low-temperature chilled water pump 14. When it is necessary to adjust the low-temperature chilled water inlet flow rate of the first surface cooler 15, it can be controlled by adjusting the speed of the low-temperature chilled water pump 14. The chilled water inlet flow rate of the second surface cooler 5 is jointly controlled by the low-temperature chilled water pump 14 and the three-way water regulating valve 16, but is mainly controlled by the three-way water regulating valve 16. That is, when the required chilled water flow rate of the first surface cooler 15 is fixed, this application can control the chilled water supply of the second surface cooler 5 through the three-way water regulating valve 16.

[0106] The low-temperature chilled water inlet temperature is mainly controlled by the compressor 10 and the three-way refrigerant regulating valve 13, but the compressor 10 is the primary controller (increasing the compressor's operating frequency will lower the low-temperature chilled water inlet temperature, and vice versa). Therefore, when it is necessary to lower the low-temperature chilled water inlet temperature, this application can reduce the refrigerant flow rate into the second evaporator 9 by controlling the three-way refrigerant regulating valve 13. This reduces the superheat of the refrigerant entering the compressor 10, ensuring that the compressor's operating frequency is not too high while effectively guaranteeing the cooling capacity of the first evaporator 12.

[0107] Furthermore, when the system cooling load increases, such as when the temperature detector detects that the low-temperature chilled water inlet temperature is about to rise, this application can increase the operating frequency of the compressor 10. When the system cooling load decreases, the operating frequency of the compressor 10 can be decreased to maintain the control stability of the low-temperature chilled water inlet temperature, ensuring that the system can maintain efficient and stable operation under different operating conditions. Through this precise control method, not only can the user's personalized needs for indoor humidity be met, but the system's energy consumption can also be effectively reduced, and the overall operating efficiency can be improved.

[0108] Furthermore, when the fresh air subsystem and the low-temperature chilled water system work together, this application can dynamically adjust their operating parameters according to actual environmental conditions. For example, in a high-humidity environment, the system will prioritize enhancing the cooling capacity of the low-temperature chilled water to quickly reduce the moisture content of the fresh air; while in a low-humidity environment, the cooling effect will be appropriately reduced to avoid energy waste caused by excessive dehumidification. At the same time, by monitoring the real-time humidity changes in the air-conditioned room, the system can automatically optimize the operating status of the fresh air fan 17 and the low-temperature chilled water pump 14 to ensure that the indoor humidity is always maintained within the set range, providing users with a more comfortable indoor environment.

[0109] This coordinated adjustment strategy of humidity and airflow ensures precise control of indoor humidity while avoiding energy waste or environmental fluctuations caused by adjusting a single parameter, further improving the system's energy efficiency and comfort.

[0110] In one embodiment, the air conditioning system includes at least a compressor 10, a high-temperature chilled water system, and a temperature and humidity control air conditioning system, wherein the temperature and humidity control air conditioning system includes at least a terminal sensible heat exchange subsystem.

[0111] S130, adjusting the indoor airflow of the sensible heat exchanger in the air-conditioned room according to the temperature control command, may include:

[0112] S131: Control the high-temperature chilled water inlet temperature and high-temperature chilled water inlet flow rate of the high-temperature chilled water system and the terminal sensible heat exchange subsystem according to the temperature control command, so as to keep the indoor temperature of the air-conditioned room stable above the indoor dew point temperature and avoid condensation in the air-conditioned room.

[0113] S132: Adjust the indoor air volume of the sensible heat exchanger in the terminal sensible heat exchange subsystem according to the temperature control command and the actual indoor temperature of the air-conditioned room.

[0114] In this embodiment, when the present application receives a temperature control command, it will initiate a comprehensive adjustment strategy to ensure precise control of the indoor temperature. First, regarding the adjustment of the high-temperature chilled water system, the present application will dynamically adjust the high-temperature chilled water inlet temperature and inlet flow rate according to the target temperature value in the temperature control command. This adjustment process aims to ensure that the indoor temperature of the air-conditioned room remains stable above the indoor dew point temperature, preventing condensation caused by excessively low temperatures, thereby maintaining the comfort of the indoor environment and the normal operation of the equipment.

[0115] Specifically, if it is necessary to lower the indoor temperature, this application will appropriately reduce the high-temperature cold water inlet temperature or increase the inlet water flow rate to enhance the heat exchange efficiency between the sensible heat exchange equipment and the indoor air and accelerate the removal of indoor heat; conversely, when the indoor temperature is close to the set value, this application will increase the high-temperature cold water inlet temperature or reduce the inlet water flow rate to slow down the heat exchange rate and avoid excessive drop in indoor temperature.

[0116] In one specific implementation, the high-temperature chilled water inlet flow rate of this application can be adjusted by the high-temperature chilled water pump 18. The high-temperature chilled water inlet temperature is mainly controlled by adjusting the wet-bulb temperature of the air entering the cooling tower 6, which in turn is controlled by the cooling capacity of the second surface cooler 5, the heating capacity of the condenser 8, the airflow of the processing fan 1, and the airflow of the regeneration fan 7. For example, when the processing airflow and the regeneration airflow are constant, and it is necessary to reduce the high-temperature chilled water inlet temperature, the moisture content and dry-bulb temperature of the processing air can be reduced. That is, on the one hand, the operating power of the compressor 10 is increased to raise the condensing temperature of the condenser 8, and on the other hand, the low-temperature chilled water inlet flow rate of the second surface cooler 5 is increased by adjusting the three-way water regulating valve 16.

[0117] Furthermore, when the system cooling load increases, the operating frequency of compressor 10 can be increased; when the system cooling load decreases, the operating frequency of compressor 10 can be decreased to maintain the control stability of the high-temperature chilled water inlet temperature and ensure that the system can maintain efficient and stable operation under different operating conditions. Simultaneously, by dynamically adjusting the wet-bulb temperature of the inlet air of cooling tower 6, the cooling effect of the high-temperature chilled water can be further optimized, thereby improving the overall energy efficiency ratio of the system. For example, under high-load conditions, the system will prioritize increasing the heating power of condenser 8 and the cooling capacity of the second surface cooler 5 to quickly reduce the inlet temperature of the high-temperature chilled water; while under low-load conditions, heating and cooling outputs will be appropriately reduced to avoid energy waste.

[0118] The airflow of regenerated air and processed air is regulated by controlling the rotational speeds of the regeneration fan 7 and the processed air fan 1, respectively. The flow rate of processed air can be determined based on the air-to-water ratio of the cooling tower 6. For example, once the required high-temperature chilled water flow rate at the user's terminal is determined (generally based on experience or calculated from the user's cooling load), the flow rate of processed air can be calculated based on the air-to-water ratio of the cooling tower 6. The flow ratio of regenerated air to processed air can be determined according to the ratio of the regeneration zone area to the dehumidification zone area of ​​the dehumidification rotor 2. For example, when the ratio of the regeneration zone area to the dehumidification zone area of ​​the dehumidification rotor 2 is 1:1, the flow ratio of regenerated air to processed air is also 1:1.

[0119] Furthermore, since adsorption heat is generated during dehumidification, the temperature of the dehumidified air increases. When the temperature increase is significant and the heat recovery of the third sensible heat exchanger 4 is substantial, the exhaust temperature of the processed air from the third sensible heat exchanger 4 (the air discharged from the cooling tower 6) may be higher than the outdoor air temperature. In this case, this application can control the three-way air regulating valve 24 to allow all or part of the processed air to bypass through the third sensible heat exchanger 4, so that the mixing temperature of the bypass air and the exhaust air from the third sensible heat exchanger 4 is lower than that of the outdoor air, thereby ensuring the pre-cooling effect of the first sensible heat exchanger 23 on the outdoor air (processed air intake).

[0120] Secondly, regarding the adjustment of indoor air circulation volume of sensible heat exchange equipment in the terminal sensible heat exchange subsystem, this application can make precise control based on temperature control commands and the actual indoor temperature of the air-conditioned room 22. When the indoor temperature is higher than the set value, this application will increase the indoor air circulation volume of sensible heat exchange equipment such as fan coil unit 19, radiant ceiling 20, or wall with embedded cold water pipe 21 to accelerate the heat exchange between indoor air and high-temperature cold water, thereby quickly reducing the indoor temperature; conversely, when the indoor temperature is close to or lower than the set value, this application will reduce the indoor air circulation volume to slow down the heat exchange rate, so that the indoor temperature gradually rises back to the user-set comfort range.

[0121] This coordinated regulation strategy between the high-temperature chilled water system and the terminal sensible heat exchange subsystem based on temperature control commands not only achieves precise control of the indoor temperature of the air-conditioned room, but also effectively avoids energy waste and equipment damage caused by excessive temperature fluctuations, further improving the energy efficiency ratio and operational stability of the entire dual-temperature cold source heat and humidity decoupled control air conditioning system.

[0122] Finally, it should be noted that in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0123] The various embodiments in this specification are described in a progressive manner. Each embodiment focuses on the differences from other embodiments. The various embodiments can be combined as needed, and the same or similar parts can be referred to each other.

[0124] The above description of the disclosed embodiments enables those skilled in the art to make or use this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An air conditioning system with dual-temperature cold source and heat / humidity decoupling control, characterized in that, The system includes a low-temperature chilled water system, a high-temperature chilled water system, and a temperature and humidity control air conditioning system. The temperature and humidity control air conditioning system includes a fresh air subsystem and a terminal sensible heat exchange subsystem. The low-temperature chilled water system is connected to the fresh air subsystem, the high-temperature chilled water system is connected to the terminal sensible heat exchange subsystem, and both the fresh air subsystem and the terminal sensible heat exchange subsystem are connected to the air-conditioned room. The low-temperature chilled water system is used to provide low-temperature chilled water to the fresh air subsystem so that the fresh air subsystem can bear the wet load, part of the sensible heat cooling load, and the fresh air cooling load of the air-conditioned room. The high-temperature chilled water system is used to provide high-temperature chilled water to the terminal sensible heat exchange subsystem so that the terminal sensible heat exchange subsystem can bear the remaining sensible heat cooling load of the air-conditioned room. The low-temperature chilled water system includes a compressor, a throttle valve, a condenser, a first evaporator, a second evaporator, and a three-way refrigerant regulating valve; The output end of the second evaporator is connected to the input end of the compressor, the output end of the compressor is connected to the input end of the condenser, and the output end of the condenser is connected to the input end of the first evaporator through the throttling valve; One of the output terminals of the first evaporator is connected to the fresh air subsystem, and the other output terminal is split through the three-way refrigerant regulating valve, with one path connected to the input terminal of the second evaporator and the other path connected to the input terminal of the compressor. The high-temperature chilled water system includes a processing fan, a first sensible heat exchanger, a dehumidifying impeller, a second sensible heat exchanger, a third sensible heat exchanger, a second surface cooler, a cooling tower, and a three-way air regulating valve. The processing fan is installed at the input end of the first sensible heat exchanger, and the output end of the first sensible heat exchanger is sequentially connected to the dehumidification rotor, the second sensible heat exchanger, the third sensible heat exchanger, and the second surface cooler, so as to transform the processing air sent in by the processing fan into dry air with ultra-low wet bulb temperature after four-stage cooling. One of the input ends of the cooling tower is connected to the output end of the second surface cooler, and the other input end is connected to the terminal sensible heat exchange subsystem, so that the high-temperature return water of the air-conditioned room and the dry air with ultra-low wet bulb temperature exchange heat and mass to become the low-temperature supply water of the air-conditioned room. One of the outputs of the cooling tower is split by the three-way air regulating valve, with one path entering the third sensible heat exchanger and the other path mixing with the return air from the third sensible heat exchanger before being sent to the first sensible heat exchanger.

2. The air conditioning system according to claim 1, characterized in that, The fresh air subsystem includes a low-temperature chilled water pump, a first surface cooler, a three-way water regulating valve, and a fresh air fan. The input end of the low-temperature chilled water pump is connected to the output end of the low-temperature chilled water system, and the output end is connected to one of the input ends of the first surface cooler. The other input end of the first surface cooler is connected to the output end of the fresh air fan. One of the outputs of the first surface cooler is diverted by the three-way water regulating valve, one of which enters the high-temperature cold water system, and the other of which merges with the high-temperature return water of the high-temperature cold water system and enters the low-temperature cold water system. The other output of the first surface cooler is connected to the air-conditioned room.

3. The air conditioning system according to claim 2, characterized in that, The air-conditioned rooms include fan coil air-conditioned rooms, radiant ceiling air-conditioned rooms, and wall-mounted air-conditioned rooms with embedded cold water pipes. The other output of the first surface cooler is divided into three paths, each of which enters the fan coil air-conditioned room, the radiant ceiling air-conditioned room, and the wall-mounted air-conditioned room with embedded cold water pipes, respectively.

4. The air conditioning system according to claim 1, characterized in that, The low-temperature chilled water system includes at least a condenser and a second evaporator, and the high-temperature chilled water system also includes a regeneration fan; The regeneration fan is installed at the input end of the second sensible heat exchanger, and the output end of the second sensible heat exchanger is connected to the other input end of the condenser, the dehumidifying impeller, and the second evaporator to regenerate, heat, and recover heat from the regeneration air supplied by the regeneration fan.

5. The air conditioning system according to claim 1, characterized in that, The high-temperature chilled water system includes at least a cooling tower, and the terminal sensible heat exchange subsystem includes a high-temperature chilled water pump and sensible heat exchange equipment. The sensible heat exchange equipment includes a fan coil unit, a radiant ceiling, and a wall with embedded chilled water pipes. The input end of the high-temperature chilled water pump is connected to the output end of the fan coil unit, the radiant ceiling and the wall-mounted embedded chilled water pipe, respectively. The output end of the high-temperature chilled water pump is connected to another input end of the cooling tower, which is used to send the high-temperature return water from the air-conditioned room into the cooling tower. The high-temperature cold water output from the cooling tower is sent to the fan coil unit, the radiant ceiling, and the wall with embedded cold water pipes.

6. A dual-temperature cold source heat and humidity decoupling control method, applied to an air conditioning system with dual-temperature cold source heat and humidity decoupling control as described in any one of claims 1-5, characterized in that, The method includes: The system acquires control commands input by the user for the air-conditioned room, including humidity control commands and temperature control commands. If the control command is a humidity control command, then the moisture content and air volume of the fresh air supplied by the air conditioning system are adjusted according to the humidity control command. If the control command is a temperature control command, then the indoor air circulation volume of the sensible heat exchanger in the air-conditioned room of the air conditioning system is adjusted according to the temperature control command.

7. The dual-temperature cold source heat and humidity decoupling control method according to claim 6, characterized in that, The air conditioning system includes at least a low-temperature chilled water system and a temperature and humidity control air conditioning system, and the temperature and humidity control air conditioning system includes at least a fresh air subsystem. The adjustment of the moisture content and air volume of the fresh air supplied by the air conditioning system according to the humidity control command includes: The low-temperature chilled water inlet temperature and flow rate of the low-temperature chilled water system and the fresh air subsystem are controlled according to the humidity control command to adjust the humidity content of the fresh air supplied by the air conditioning system. The low-temperature chilled water system includes a compressor; when the system cooling load increases, the operating frequency of the compressor increases; when the system cooling load decreases, the operating frequency of the compressor decreases to maintain the control stability of the low-temperature chilled water inlet temperature. The fresh air subsystem includes a low-temperature chilled water pump, and the low-temperature chilled water inlet flow rate is controlled by the low-temperature chilled water pump. The rotation speed of the fresh air fan in the fresh air subsystem is controlled according to the humidity control command, so as to adjust the air volume of the fresh air supply of the air conditioning system.

8. The dual-temperature cold source heat and humidity decoupling control method according to claim 6, characterized in that, The air conditioning system includes at least a compressor, a high-temperature chilled water system, and a temperature and humidity control air conditioning system, wherein the temperature and humidity control air conditioning system includes at least a terminal sensible heat exchange subsystem. The step of adjusting the indoor air circulation volume of the sensible heat exchanger in the air-conditioned room according to the temperature control command includes: The high-temperature chilled water inlet temperature and flow rate of the high-temperature chilled water system and the terminal sensible heat exchange subsystem are controlled according to the temperature control command to keep the indoor temperature of the air-conditioned room stable above the indoor dew point temperature and prevent condensation in the air-conditioned room; wherein, the terminal sensible heat exchange subsystem includes a high-temperature chilled water pump, and the high-temperature chilled water inlet flow rate is controlled by the high-temperature chilled water pump. When the system cooling load increases, the operating frequency of the compressor is increased; when the system cooling load decreases, the operating frequency of the compressor is decreased, in order to maintain the control stability of the high-temperature chilled water inlet temperature. Based on the temperature control command and the actual indoor temperature of the air-conditioned room, the indoor circulating air volume of the sensible heat exchanger in the terminal sensible heat exchange subsystem is adjusted.

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