Air conditioning system with high efficiency dehumidification function

Abstract

The utility model discloses a kind of air conditioning systems with high-efficiency dehumidification function, it is related to air conditioning technology field. Including compressor, outdoor condenser, double indoor heat exchanger, throttling device, valve system, controller and sensor. Indoor heat exchanger contains first and second heat exchanger, can be switched by valve system parallel / series and evaporator / condenser function;Valve system contains three-way stop valve and four-way reversing valve, controls refrigerant flow direction. Its solution traditional air conditioner "dehumidification paradox of cooling" and "low temperature high humidity dehumidification blind area":low load time double heat exchanger series formation "dehumidification-reheat" flow, utilize condensing heat compensation cooling;Low temperature time bypass outdoor condenser formation indoor independent circulation, separate outdoor dependence. Realize high-efficiency dehumidification and temperature and humidity accurate control under wide working condition, adapt to data center, museum and other high requirement scene.

Description

Technical Field

[0001] This utility model belongs to the field of air conditioning technology and relates to the structural design of an air conditioning system. It is particularly suitable for scenarios with strict requirements for temperature and humidity control, such as data center computer rooms, precision instrument rooms, constant temperature and humidity laboratories, communication base stations, museums, archives, and industrial warehouses that need to be protected from moisture all year round. Background Technology

[0002] In the field of air conditioning technology, especially in scenarios with strict temperature and humidity control requirements (such as data center computer rooms, precision instrument rooms, constant temperature and humidity laboratories, communication base stations, museums, archives, and industrial warehouses that require year-round moisture protection), the dehumidification performance of air conditioning systems directly affects environmental stability and equipment safety. Traditional air conditioning systems primarily rely on cooling mode for dehumidification. The core principle is as follows: when dehumidification is needed, the system operates in cooling mode, lowering the indoor evaporator temperature below the air dew point temperature. Water vapor in the air condenses and precipitates on the evaporator surface, completing dehumidification. Subsequently, the cooled and dehumidified air needs to be heated by a condenser or electric heater to meet the supply air temperature requirements.

[0003] However, traditional air conditioning systems have significant technical drawbacks in practical applications, making it difficult to meet the high-demand temperature and humidity control requirements of various scenarios:

[0004] 1. The "Dehumidification and Cooling Paradox" under Low-Load, High-Humidity Conditions

[0005] In scenarios with low ambient heat load but high humidity (such as computer rooms operating at night or under light load in winter), if a traditional air conditioner dehumidifies in cooling mode, the refrigerant expands violently and absorbs heat in the evaporator after passing through the throttling valve, leading to excessively low evaporator temperatures and over-cooling of the air. Although the absolute moisture content in the air decreases due to condensation, the air temperature drops even more significantly. Because the saturated vapor pressure of cold air is lower, the indoor relative humidity ultimately remains essentially unchanged or even increases. Simultaneously, over-cooling causes the supply air temperature to fall below the set range, affecting the equipment's operating environment and potentially creating condensation risks. To compensate for the excessively low temperature, the system needs to activate the reheat device (consuming more energy) or frequently start and stop the compressor, resulting in a significant reduction in energy efficiency and poor temperature and humidity control stability.

[0006] 2. "Dehumidification blind spots" under low temperature and high humidity conditions

[0007] When the ambient temperature is lower than the safe start-up temperature set for the air conditioner's cooling mode (e.g., below 15°C), but the indoor relative humidity remains high (e.g., during rainy winter days in the south or snowmelt season in the north), traditional air conditioning systems (especially those relying on outdoor unit cooling) cannot properly start the cooling cycle. This is because starting cooling in low-temperature environments may cause compressor liquid slugging or other malfunctions, or the system logic may directly prohibit low-temperature cooling operation, causing the air conditioner to completely lose its dehumidification capacity. In this situation, high humidity can easily lead to condensation and corrosion on equipment, seriously threatening the safety of precision equipment and stored items.

[0008] The aforementioned traditional air conditioning systems suffer from dehumidification deficiencies under low-load, high-humidity and low-temperature, high-humidity conditions, making it difficult to meet the stringent requirements of scenarios demanding precise temperature and humidity control, energy efficiency, and operational stability. Therefore, there is an urgent need for a high-efficiency dehumidification air conditioning system that can overcome existing technological limitations and adapt to a wide range of operating conditions. Utility Model Content

[0009] In view of the shortcomings of the existing technology, this utility model provides an air conditioning system with efficient dehumidification function.

[0010] The above-mentioned objectives of this utility model are achieved through the following technical means:

[0011] An air conditioning system with high-efficiency dehumidification function includes a compressor 1, an outdoor condenser 2, an indoor heat exchanger 3, a throttling device 4, a valve system 5, a fan 6, a controller, and sensors;

[0012] The indoor heat exchanger 3 includes a first indoor heat exchanger 31 and a second indoor heat exchanger 32, which are switched to be installed in parallel or in series in the pipeline through a valve system. Both can be switched to be evaporators through a valve system. The first indoor heat exchanger 31 can be switched to be a condenser through a valve system.

[0013] The outdoor condenser 2, the first indoor heat exchanger 31, and the second indoor heat exchanger 32 are all connected to the corresponding fan 6.

[0014] The throttling device 4 includes a first throttling device 41 connected in series with the lower pipe of the first indoor heat exchanger 31 and a second throttling device 42 connected in series with the lower pipe of the second indoor heat exchanger 32.

[0015] The sensors include indoor and outdoor temperature and humidity sensors and pipeline temperature sensors;

[0016] The valve system 5 includes a check valve 7 and:

[0017] The first three-way shut-off valve 51 and the second three-way shut-off valve 52 are used to control the parallel or series switching and mode switching of the first indoor heat exchanger 31 and the second indoor heat exchanger 32.

[0018] A four-way reversing valve 8 is used to switch the overall flow direction of refrigerant. The inlet end of the four-way reversing valve 8 is connected to the outlet of the compressor via a pipeline, and the outlet end is selectively connected to the outdoor condenser 2 or the second three-way shut-off valve 52 via a pipeline.

[0019] The other end of the outdoor condenser 2 is connected to the first three-way shut-off valve 51 via a pipeline;

[0020] The return port of the compressor 1 is connected by a pipeline to the upper pipeline of the second indoor heat exchanger 32 and the second three-way shut-off valve 52.

[0021] The sensor, compressor 1, fan 6, valve system 5, and throttling device 4 are electrically connected to the controller.

[0022] Furthermore,

[0023] The first port of the first three-way shut-off valve 51 is connected to the outdoor condenser 2 via a pipeline, the second port is connected to the lower pipeline of the indoor heat exchanger 3 via a pipeline, the third port is connected to the inlet of the one-way valve 7 via a pipeline, and the outlet of the one-way valve 7 is connected to the upper pipeline of the first indoor heat exchanger 31 via a pipeline.

[0024] The first port of the second three-way shut-off valve 52 is connected to the four-way reversing valve 8 via a pipeline, the second port is connected to the upper pipeline of the first indoor heat exchanger 31 via a pipeline, and the third port is connected to the upper pipeline of the second indoor heat exchanger 32 and the return gas pipeline of the compressor 1 via a pipeline.

[0025] Furthermore,

[0026] The four-way reversing valve 8 includes a D port 81, an E port 82, an S port 83, and a C port 84;

[0027] The D interface 81 is connected to the air outlet of the compressor 1 via a pipeline;

[0028] The E interface 82 is connected to the first interface of the second three-way shut-off valve 52 via a pipeline;

[0029] The S-interface 83 is connected to the return gas line of the compressor 1 via a pipeline;

[0030] The C interface 84 is connected to the outdoor condenser 2 via a pipe.

[0031] Optionally, the air conditioning system includes a series piping structure, wherein:

[0032] The first port of the first three-way shut-off valve 51 is directly connected to the third port, and the second port is not connected to other ports; the first port of the second three-way shut-off valve 52 is directly connected to the third port, and the second port is not connected to other ports; the D port 81 and C port 84 of the four-way reversing valve 8 are directly connected, and the E port 82 and S port 83 are directly connected.

[0033] The outlet of the outdoor condenser 2 is connected in sequence via pipeline to the first port and the third port of the first three-way shut-off valve 51, the one-way valve 7, the first indoor heat exchanger 31, the first throttling device 41, the second throttling device 42, and the second indoor heat exchanger 32 is connected via pipeline to the return port of the compressor 1.

[0034] Optionally, the air conditioning system includes another series piping structure, in which:

[0035] The first port of the first three-way shut-off valve 51 is directly connected to the third port, and the second port is not connected to other ports; the first port of the second three-way shut-off valve 52 is directly connected to the second port, and the third port is not connected to other ports; the D port 81 and E port 82 of the four-way reversing valve 8 are directly connected, and the S port 83 and C port 84 are directly connected.

[0036] The outlet of compressor 1 is connected via pipeline to the D port 81 and E port 82 of four-way reversing valve 8, the first port of second three-way shut-off valve 52, the second port of second three-way shut-off valve 52, the first indoor heat exchanger 31, the first throttling device 41, the second throttling device 42, the second indoor heat exchanger 32, and the return port of compressor 1 via pipeline.

[0037] Optionally, the air conditioning system includes a parallel piping structure, wherein:

[0038] The first port of the first three-way shut-off valve 51 is directly connected to the second port, and the third port is not connected to other ports; the second port of the second three-way shut-off valve 52 is directly connected to the third port, and the first port is not connected to other ports; the D port 81 and C port 84 of the four-way reversing valve 8 are directly connected, and the E port 82 and S port 83 are directly connected.

[0039] The outlet of the outdoor condenser 2 is connected to the first port of the first three-way shut-off valve 51 via a pipeline, and the second port of the first three-way shut-off valve 51 is divided into two branches via a pipeline:

[0040] The first branch line connects in sequence to the first throttling device 41, the first indoor heat exchanger 31, the second port and the third port of the second three-way shut-off valve 52, and then connects to the return port of the compressor 1 via a pipeline;

[0041] The second branch line connects sequentially to the second throttling device 42 and the second indoor heat exchanger 32, and then connects to the return port of the compressor 1 via a pipeline.

[0042] Optionally, it also includes a low-load, high-efficiency dehumidification pipeline structure, wherein the series pipeline structure is the low-load, high-efficiency dehumidification pipeline structure.

[0043] Optionally, it also includes a low-temperature independent dehumidification pipeline structure, wherein the series pipeline structure is the low-temperature independent dehumidification pipeline structure.

[0044] Optionally, it also includes a conventional refrigeration piping structure, wherein the parallel piping structure is the conventional refrigeration piping structure.

[0045] Preferably, the air conditioning system further includes a controller, which is signal-connected to the controller; the controller has function keys for a normal cooling mode, a low-load high-efficiency dehumidification mode, and a low-temperature independent dehumidification mode.

[0046] The beneficial effects of adopting the above technical solution are as follows:

[0047] 1. Breaking through the limitations of traditional air conditioning dehumidification, by switching the function of dual indoor heat exchangers and converting series / parallel pipelines, it simultaneously solves the "low load high humidity dehumidification and cooling paradox" and the "low temperature high humidity dehumidification blind spot", achieving efficient dehumidification under a wide range of operating conditions.

[0048] 2. The valve system interface connection relationship and on / off logic of this utility model make the parallel / series switching and functional mode (evaporator / condenser) switching of the first and second indoor heat exchangers more accurate and reliable, providing a stable pipeline foundation for operation under different working conditions.

[0049] 3. Standardize the interface function and connection logic of the four-way reversing valve to accurately control the flow direction switching of refrigerant "through the outdoor condenser" and "bypass the outdoor condenser", providing a clear control basis for the refrigerant path in multi-mode operation.

[0050] 4. In the low-load, high-efficiency dehumidification mode, the first indoor heat exchanger recovers the condensation heat to reheat the dehumidified air, eliminating the need for additional electric heating and avoiding excessive cooling. This reduces energy consumption while ensuring stable supply air temperature.

[0051] 5. The low-temperature independent dehumidification mode forms a closed indoor circulation by bypassing the outdoor condenser, thus breaking away from the dependence on the low outdoor temperature environment and overcoming the limitation of traditional air conditioners that "cannot start cooling at low temperatures", achieving stable dehumidification under low temperature and high humidity conditions.

[0052] 6. In the conventional cooling mode, dual indoor heat exchangers are used in parallel as evaporators to increase the heat exchange area and control the refrigerant flow through branch throttling, which significantly improves the cooling efficiency and cooling speed under high load.

[0053] 7. Clearly define the relationship between the low-load high-efficiency dehumidification mode and the corresponding series piping. When a low-load high-humidity condition is detected, the system can quickly switch to the optimal refrigerant path to ensure humidity control accuracy and energy efficiency.

[0054] 8. Clearly define the relationship between the low-temperature independent dehumidification mode and the corresponding series pipeline. When a low-temperature and high-humidity condition is detected, the system automatically switches to indoor independent circulation to ensure stable operation of the dehumidification function in a low-temperature environment.

[0055] 9. Clearly define the relationship between the conventional cooling mode and the corresponding parallel piping, and quickly switch to the dual evaporator parallel operation state under normal heat load conditions to ensure the synergistic effect of efficient cooling and light dehumidification.

[0056] 10. A controller with mode function keys has been added to enable manual and quick switching between regular cooling, low-load high-efficiency dehumidification, and low-temperature independent dehumidification modes, improving operational flexibility and adapting to the personalized temperature and humidity control needs of scenarios such as data centers and museums. Attached Figure Description

[0057] Figure 1 This is a schematic diagram of the air conditioning system structure under low-load, high-efficiency dehumidification mode;

[0058] Figure 2 This is a schematic diagram of the air conditioning system structure under low-temperature independent dehumidification mode;

[0059] Figure 3 This is a schematic diagram of an air conditioning system in conventional cooling operation mode.

[0060] Among them, compressor 1; outdoor condenser 2; indoor heat exchanger 3; first indoor heat exchanger 31; second indoor heat exchanger 32; throttling device 4; first throttling device 41; second throttling device 42; valve system 5; first three-way shut-off valve 51; second three-way shut-off valve 52; fan 6; one-way valve 7; four-way reversing valve 8; D interface 81; E interface 82; S interface 83; C interface 84. Detailed Implementation

[0061] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only a part of the embodiments of the present utility model, and not all of them. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0062] Example 1. To address the technical problems of traditional air conditioners exhibiting a "dehumidification and cooling paradox" under low-load, high-humidity conditions, a "dehumidification blind spot" under low-temperature, high-humidity conditions, and insufficient temperature and humidity control accuracy and energy efficiency, the technical solution is as follows:

[0063] like Figure 1-3As shown, an air conditioning system with high-efficiency dehumidification function includes a compressor 1, an outdoor condenser 2, an indoor heat exchanger 3, a throttling device 4, a valve system 5, a fan 6, a controller, and sensors. The indoor heat exchanger 3 includes a first indoor heat exchanger 31 and a second indoor heat exchanger 32, which are switched in parallel or in series in the pipeline via the valve system. Both can be switched to evaporators via the valve system, and the first indoor heat exchanger 31 can be switched to condenser via the valve system. The outdoor condenser 2, the first indoor heat exchanger 31, and the second indoor heat exchanger 32 are all connected to corresponding fans 6. The throttling device 4 includes a first throttling device 41 connected in series in the lower pipeline of the first indoor heat exchanger 31 and a second throttling device 42 connected in series in the lower pipeline of the second indoor heat exchanger 32. The sensor... The device includes indoor and outdoor temperature and humidity sensors and pipeline temperature sensors; the valve system 5 includes a one-way valve 7 and: a first three-way shut-off valve 51 and a second three-way shut-off valve 52 for controlling the parallel or series switching and mode switching of the first indoor heat exchanger 31 and the second indoor heat exchanger 32; a four-way reversing valve 8 for switching the overall flow direction of the refrigerant, the inlet end of the four-way reversing valve 8 being connected to the outlet of the compressor via a pipeline, and the outlet end being selectively connected to the outdoor condenser 2 or the second three-way shut-off valve 52 via a pipeline; the other end of the outdoor condenser 2 being connected to the first three-way shut-off valve 51 via a pipeline; the return port of the compressor 1 being connected to the upper pipeline of the second indoor heat exchanger 32 and the second three-way shut-off valve 52 via a pipeline; the sensors, compressor 1, fan 6, valve system 5 and throttling device 4 are electrically connected to the controller.

[0064] In this embodiment, the controller monitors indoor and outdoor temperature and humidity as well as pipeline temperature in real time through sensors.

[0065] According to the operating conditions, the connection method (parallel or series) and function switching (evaporator or condenser) of the first indoor heat exchanger 31 and the second indoor heat exchanger 32 are controlled by the valve system.

[0066] The throttling device adjusts the refrigerant flow rate to adapt to different modes: when the refrigerant enters the heat exchanger directly, it functions as a condenser (at this time, the heat exchanger is a condenser); when the refrigerant is depressurized by the throttling device before entering the heat exchanger, it functions as an evaporator (at this time, the heat exchanger is an evaporator).

[0067] Fans, in conjunction with heat exchangers, enhance the heat exchange between air and refrigerant.

[0068] The four-way reversing valve enables the switching of the overall refrigerant flow direction, thereby flexibly switching operating modes to adapt to different temperature and humidity conditions.

[0069] The valve system works in conjunction with the four-way reversing valve to achieve three different refrigerant flow directions, such as low-load high-efficiency dehumidification, low-temperature independent dehumidification, and refrigerant flow direction under normal refrigeration operation mode.

[0070] The air conditioning system described in Example 1 addresses two major technical pain points of traditional air conditioners through structural innovation and mode switching design, as detailed below:

[0071] I. The Logic for Solving the "Dehumidification and Cooling Paradox"

[0072] The core problem with traditional air conditioners under low load and high humidity conditions is that the evaporator cools down too much during cooling and dehumidification, resulting in excessively low air temperature, making it difficult to effectively reduce relative humidity, and requiring additional energy consumption for reheating.

[0073] The system in Example 1 overcomes this paradox through the following design:

[0074] Functional reuse and series control of dual indoor heat exchangers: The system is equipped with a first indoor heat exchanger 31 and a second indoor heat exchanger 32, which can be switched to a series structure via a valve system. Under low load and high humidity conditions, the controller, through the coordinated control of the first three-way shut-off valve 51, the second three-way shut-off valve 52, and the four-way reversing valve 8, directs the refrigerant to flow to the first indoor heat exchanger 31, causing it to switch to condenser heat release. After being depressurized by the first throttling device 41 and the second throttling device 42, the refrigerant flows to the second indoor heat exchanger 32, switching to evaporator heat absorption and dehumidification, forming a series process of "dehumidification-reheat".

[0075] Condensation heat recovery and reheating: The refrigerant path is as follows: After initial condensation of the compressor exhaust by the outdoor condenser, the refrigerant is controlled to enter the first indoor heat exchanger 31 through the first three-way shut-off valve 51 and the one-way valve 7 for further condensation and heat release. At this time, the first heat exchanger acts as a condenser. Subsequently, the refrigerant enters the second indoor heat exchanger 32 after two stages of throttling and pressure reduction, where it evaporates and absorbs heat. At this time, the second heat exchanger acts as an evaporator, thus achieving air dehumidification. The air is first cooled and dehumidified by the second heat exchanger, and then flows through the first heat exchanger where it is heated by the condensation heat released by the first heat exchanger. Finally, the supply air temperature is stabilized within the set range, avoiding the problem of "excessive cooling leading to a rebound in relative humidity".

[0076] Energy efficiency improvement: Reheating is achieved by using the system's own condensation heat instead of additional electric heating, which reduces the extra energy consumption of traditional air conditioners and solves the pain point of "low energy efficiency caused by frequent compressor start-stop or additional heating".

[0077] II. Solution Logic for "Dehumidification Blind Spots"

[0078] The core limitation of traditional air conditioners under low temperature and high humidity conditions is that when the ambient temperature is lower than the safe starting temperature for cooling, the cooling cycle cannot start, and the dehumidification capacity is lost.

[0079] The system in Example 1 overcomes this limitation through the following design:

[0080] Independent indoor circulation with outdoor condenser bypass: The system, through the switching of the four-way reversing valve 8, allows the refrigerant to completely bypass the outdoor condenser 2, forming an independent circulation that relies solely on the indoor heat exchanger. Under low temperature and high humidity conditions, the controller controls the four-way reversing valve to switch the refrigerant flow direction as follows: the compressor exhaust directly enters the first indoor heat exchanger 31 for condensation and heat release. At this time, the first heat exchanger acts as a condenser, releasing compression heat to heat the indoor air. The refrigerant, after throttling, enters the second indoor heat exchanger 32 for evaporation and heat absorption. At this time, the second heat exchanger acts as an evaporator, achieving air dehumidification, and finally returns to the compressor.

[0081] Dependent on outdoor environment: In this mode, the refrigerant does not pass through the outdoor condenser, eliminating the need to consider the limitations of low outdoor temperatures on the refrigeration cycle, such as the risk of compressor liquid slugging. Dehumidification is achieved solely through the indoor "condensation heat release - evaporation heat absorption" cycle. Simultaneously, the heat released by the first heat exchanger can offset the cooling effect of the second heat exchanger, preventing further decrease in indoor temperature and ensuring stable dehumidification even in low-temperature environments.

[0082] Precise control adapts to low-temperature scenarios: Sensors monitor indoor temperature and humidity in real time. When the ambient temperature is detected to be below the cooling safety threshold but the humidity exceeds the standard, the controller automatically switches to this independent circulation mode, breaking through the "temperature start limit" of traditional air conditioners and solving the pain point of "complete inability to dehumidify in low-temperature and high-humidity environments".

[0083] Example 1 utilizes the flexible switching between series and parallel piping via dual indoor heat exchangers, and employs a four-way reversing valve, a first three-way shut-off valve 51, a second three-way shut-off valve 52, and a one-way valve 7 to control flow direction. A collaborative design involving real-time sensor regulation further enables the creation of a "dehumidification-reheating" series process for low-load, high-humidity conditions and an "indoor independent circulation" process for low-temperature, high-humidity conditions. This approach addresses both the "dehumidification and cooling paradox" and the "dehumidification blind spot" of traditional air conditioning systems from both structural and control logic perspectives, achieving efficient dehumidification and precise temperature and humidity control across a wide range of operating conditions.

[0084] Example 2. This example is based on Example 1, such as... Figure 1-3 This illustrates the connection relationships between the valve system and various devices:

[0085] The first port of the first three-way shut-off valve 51 is connected to the outdoor condenser 2 via a pipeline, the second port is connected to the lower pipeline of the indoor heat exchanger 3 via a pipeline, and the third port is connected to the inlet of the one-way valve 7 via a pipeline. The outlet of the one-way valve 7 is connected to the upper pipeline of the first indoor heat exchanger 31 via a pipeline. The first port of the second three-way shut-off valve 52 is connected to the four-way reversing valve 8 via a pipeline, the second port is connected to the upper pipeline of the first indoor heat exchanger 31 via a pipeline, and the third port is connected to the upper pipeline of the second indoor heat exchanger 32 and the return gas pipeline of the compressor 1 via a pipeline.

[0086] The first three-way shut-off valve 51 controls the on / off state of the three ports to achieve the connection and switching between the outdoor condenser 2 and the one-way valve 7 (connected to the first indoor heat exchanger 31) or the lower pipeline of the indoor heat exchanger.

[0087] The second three-way shut-off valve 52 controls the on / off state of the three ports to achieve the connection and switching between the four-way reversing valve 8 and the first indoor heat exchanger 31 or the return gas pipeline from the first indoor heat exchanger 31 to the compressor.

[0088] For example, in a series piping structure, the first port of the first three-way shut-off valve 51 is connected to the third port, and the second port of the second three-way shut-off valve 52 is not connected to other ports, thus realizing the series connection of the two indoor heat exchangers; in a parallel piping structure, the first port of the first three-way shut-off valve 51 is connected to the second port, and the second port of the second three-way shut-off valve 52 is connected to the third port, thus realizing the parallel connection of the two indoor heat exchangers.

[0089] This embodiment clarifies the connection relationship between the valve system and each piece of equipment, enabling the parallel / series switching and functional mode switching of the first and second indoor heat exchangers, providing a stable pipeline foundation for efficient operation under different working conditions.

[0090] Example 3. This example is based on Example 2, such as... Figure 1-3 This illustrates the flow direction switching and connection logic of the four-way reversing valve:

[0091] The four-way reversing valve 8 includes a D port 81, an E port 82, an S port 83, and a C port 84; the D port 81 is connected to the outlet of the compressor 1 via a pipeline; the E port 82 is connected to the first port of the second three-way shut-off valve 52 via a pipeline; the S port 83 is connected to the return gas pipeline of the compressor 1 via a pipeline; and the C port 84 is connected to the outdoor condenser 2 via a pipeline.

[0092] The four-way reversing valve 8 changes the interface connection relationship by switching the internal valve disc: when the D interface 81 is connected to the C interface 84 and the E interface 82 is connected to the S interface 83, the refrigerant enters the outdoor condenser 2 from the compressor outlet through the D interface → C interface; when the D interface 81 is connected to the E interface 82, the refrigerant enters the second three-way shut-off valve 52 from the compressor outlet through the D interface → E interface.

[0093] This embodiment clarifies the interface function and connection logic of the four-way reversing valve, enabling the refrigerant to switch flow directions between the outdoor condenser and the indoor heat exchanger, providing a clear control basis for the refrigerant path in low-load high-efficiency dehumidification, low-temperature independent dehumidification, and conventional refrigeration operation modes.

[0094] Example 4. This example is based on Example 3. To solve the technical problem of excessive cooling during dehumidification under low load and high humidity conditions, the following technical solution is adopted:

[0095] like Figure 1 As shown, the air conditioning system includes a series piping structure, in which: the first port of the first three-way shut-off valve 51 is directly connected to the third port, and the second port is not connected to other ports; the first port of the second three-way shut-off valve 52 is directly connected to the third port, and the second port is not connected to other ports; the D port 81 and C port 84 of the four-way reversing valve 8 are directly connected, and the E port 82 and S port 83 are directly connected; the outlet of the outdoor condenser 2 is connected in sequence via piping to the first port and the third port of the first three-way shut-off valve 51, the one-way valve 7, the first indoor heat exchanger 31, the first throttling device 41, the second throttling device 42, and the second indoor heat exchanger 32 is connected via piping to the return port of the compressor 1.

[0096] This embodiment is a piping structure for a low-load, high-efficiency dehumidification mode. The refrigerant flow path is as follows: high-temperature, high-pressure refrigerant discharged from compressor 1 → D port 81 of four-way reversing valve 8 → C port 84 → outdoor condenser 2 (heat release) → first port of first three-way shut-off valve 51 → third port → one-way valve 7 → first indoor heat exchanger 31 (as condenser heat release) → first throttling device 41 (pressure reduction) → second throttling device 42 (pressure reduction) → second indoor heat exchanger 32 (as evaporator heat absorption and dehumidification) → upper pipe of second indoor heat exchanger 32 → return gas pipe of compressor 1 → return gas of compressor 1.

[0097] Example 4 (Low-load, high-efficiency dehumidification mode) is illustrated.

[0098] Scenario: Suppose a data center is operating at night with low server load (low environmental heat load), but high outdoor humidity causes indoor humidity to exceed the standard (e.g., relative humidity 80%). Using traditional air conditioning for dehumidification in this situation can easily lead to excessive cooling of the evaporator, resulting in excessively low indoor temperatures and persistently high relative humidity, potentially causing condensation on equipment. Example 4's low-load, high-efficiency dehumidification mode specifically addresses this type of problem.

[0099] In this mode, the system forms a series pipeline by switching valves, and the status of the core components is as follows:

[0100] First three-way shut-off valve 51: Only the first port (connected to the outdoor condenser) and the third port (connected to the check valve) are connected, and the second port is closed (not connected to the indoor heat exchanger's lower pipeline);

[0101] Second three-way shut-off valve 52: Only the first port (connected to the four-way reversing valve) and the third port (connected to the second indoor heat exchanger and compressor return pipe) are connected, and the second port is closed;

[0102] Four-way reversing valve 8: Only the D port (connected to the compressor outlet) and the C port (connected to the outdoor condenser) are connected;

[0103] First indoor heat exchanger 31: acts as a condenser (heat release); Second indoor heat exchanger 32: acts as an evaporator (heat absorption and dehumidification);

[0104] Throttling device: The first throttling device 41 and the second throttling device 42 are connected in series to reduce the pressure of the refrigerant.

[0105] Refrigerant flow and air handling process:

[0106] Compressor "boosting heat generation": The compressor compresses the refrigerant into a high-temperature, high-pressure gaseous state (such as the temperature rising to 80-90℃), and sends it to the outdoor condenser through the four-way reversing valve D port → C port.

[0107] "Initial heat dissipation" of the outdoor condenser: The high-temperature and high-pressure refrigerant dissipates heat to the outdoor air in the outdoor condenser. If the temperature drops to 45-55℃, it becomes a medium-temperature and high-pressure liquid or gas-liquid mixture (natural cooling).

[0108] Secondary heat dissipation (heat release) of the first indoor heat exchanger: After the refrigerant flows out from the outdoor condenser, it passes through the first port of the first three-way shut-off valve 51, then the third port, and finally the check valve, before entering the first indoor heat exchanger 31. At this time, the refrigerant does not pass through the throttling device and enters the heat exchanger directly. Therefore, the first indoor heat exchanger acts as a condenser, releasing heat to the indoor air (preheating the indoor air). The refrigerant temperature further drops to, for example, 30-40℃, and remains in a high-pressure liquid state.

[0109] The throttling device "reduces pressure and temperature": After the refrigerant flows out of the heat exchanger in the first room, it passes through the first throttling device 41 and the second throttling device 42 in sequence. The pressure drops sharply (from high pressure to low pressure), and the temperature also drops sharply to 5-10℃, becoming a low-temperature and low-pressure gas-liquid mixture.

[0110] The second indoor heat exchanger performs "heat absorption and dehumidification": Low-temperature, low-pressure refrigerant enters the second indoor heat exchanger 32. At this time, the refrigerant is throttled and depressurized before entering the heat exchanger. Therefore, the second indoor heat exchanger acts as an evaporator, absorbing a large amount of heat from the indoor air. When the indoor air flows through this area, its temperature is lowered below the dew point, and the water vapor in the air condenses into water droplets (achieving dehumidification, such as reducing the relative humidity from 80% to 50%). The air temperature is temporarily lowered to slightly lower than the set temperature, such as 15-18℃.

[0111] Air "reheating": The cold air, after being dehumidified by the second indoor heat exchanger, flows through the first indoor heat exchanger 31 (at this time, the first heat exchanger is releasing heat), absorbs the heat released by it, and the temperature rises back to the set range (such as 22-24℃), and is finally sent back to the room in a "dry but not cold" state.

[0112] Refrigerant "recirculation": After absorbing heat in the second indoor heat exchanger, the refrigerant becomes a low-pressure gaseous state, flows through the upper pipeline of the second indoor heat exchanger → compressor return pipe, and returns to the compressor for recompression, completing the cycle.

[0113] The key to "dehumidification without cooling": In traditional air conditioning dehumidification, the air is only cooled and dehumidified by the evaporator without subsequent heating, resulting in excessively low temperatures; however, in this mode, the second indoor heat exchanger is responsible for "dehumidification" (cooling and water removal), while the first indoor heat exchanger is responsible for "reheating" (using its own condensation heat to supplement the temperature). The air is dehumidified first and then heated, and the final supply air temperature is stabilized at the set value, avoiding the problem of "excessively low temperature after dehumidification and relative humidity rising instead".

[0114] The entire process requires no additional electric heating; it directly utilizes the refrigerant's condensation heat for reheating, reducing the extra energy consumption of traditional air conditioners and making it more energy-efficient.

[0115] Example 4 uses a series piping design, where the first and second indoor heat exchangers function as a "condenser (heat release)" and an "evaporator (heat absorption and dehumidification)" respectively. Combined with the refrigerant's "heat dissipation-pressure reduction-heat absorption" process, this achieves a coordinated "dehumidification followed by temperature replenishment" of the air. Its core solution addresses the "dehumidification and cooling paradox" under low-load, high-humidity conditions.

[0116] It avoids the problem of excessive cooling during dehumidification by traditional air conditioners, ensuring that the supply air temperature remains stable within the set range;

[0117] By utilizing the system's own condensation heat to replace additional heating devices, energy consumption is reduced.

[0118] It effectively reduces indoor absolute humidity while maintaining stable relative humidity, thereby reducing the risk of equipment condensation and improving the accuracy and stability of temperature and humidity control under low-load conditions.

[0119] Example 5. This example is based on Example 3. To solve the technical problem of the inability to start refrigeration and dehumidification under low temperature and high humidity conditions, the following technical solution is adopted:

[0120] like Figure 2 As shown, the air conditioning system includes another series piping structure, in which: the first port of the first three-way shut-off valve 51 is directly connected to the third port, and the second port is not connected to other ports; the first port of the second three-way shut-off valve 52 is directly connected to the second port, and the third port is not connected to other ports; the D port 81 and E port 82 of the four-way reversing valve 8 are directly connected, and the S port 83 and C port 84 are directly connected; the outlet of the compressor 1 is connected to the D port 81 and E port 82 of the four-way reversing valve 8, the first port of the second three-way shut-off valve 52, the second port of the second three-way shut-off valve 52, the first indoor heat exchanger 31, the first throttling device 41, the second throttling device 42, the second indoor heat exchanger 32, and the return port of the compressor 1 is connected to the return port of the compressor 1 via a pipeline.

[0121] This embodiment describes the piping structure for a low-temperature independent dehumidification mode. The refrigerant flow path is as follows: high-temperature, high-pressure refrigerant discharged from compressor 1 → D port 81 of the four-way reversing valve 8 → E port 82 → first port of the second three-way shut-off valve 52 → second port → first indoor heat exchanger 31 (as a condenser for heat release) → first throttling device 41 (pressure reduction) → second throttling device 42 (pressure reduction) → second indoor heat exchanger 32 (as an evaporator for heat absorption and dehumidification) → upper pipe of the second indoor heat exchanger 32 → return gas pipe of compressor 1 → return gas from compressor 1. This path completely bypasses the outdoor condenser 2 (the refrigerant does not pass through the outdoor condenser 2 during the circulation process, but bypasses it and takes other piping paths; the outdoor condenser 2 does not participate in the heat dissipation or heat exchange of the refrigerant in this mode), forming an independent indoor circulation.

[0122] Example 5 (Low Temperature Independent Dehumidification Mode)

[0123] Scenario: Imagine a rainy winter day in southern China. The temperature inside a museum exhibition hall is only 12°C (below the safe starting temperature of 15°C for traditional air conditioning), but the relative humidity is as high as 85%, causing slight condensation on the surfaces of the exhibits due to moisture in the air. Traditional air conditioners cannot start cooling and dehumidifying due to low temperature limitations, while the low-temperature independent dehumidification mode in Example 5 specifically solves this type of problem of "low temperature and high humidity but unable to dehumidify".

[0124] In this mode, the system forms independent series pipelines indoors through valve switching, and the status of the core components is as follows:

[0125] First three-way shut-off valve 51: The first port (connected to the outdoor condenser) is connected to the third port (connected to the check valve), and the second port is closed (not connected to the indoor heat exchanger's lower pipeline).

[0126] Second three-way shut-off valve 52: The first port (connected to the four-way reversing valve) is connected to the second port (connected to the first indoor heat exchanger), and the third port is closed;

[0127] The four-way reversing valve 8: the D port (connected to the compressor outlet) is connected to the E port (connected to the second three-way shut-off valve);

[0128] First indoor heat exchanger 31: acts as a condenser (releasing heat to heat the air); Second indoor heat exchanger 32: acts as an evaporator (absorbing heat to dehumidify).

[0129] Throttling device: The first throttling device 41 and the second throttling device 42 are connected in series to reduce the pressure of the refrigerant;

[0130] Key features: Refrigerant completely bypasses the outdoor condenser (does not pass through the outdoor condenser, and the outdoor condenser does not participate in the operation).

[0131] Refrigerant flow and air handling process:

[0132] The compressor "pressurizes and generates heat": The compressor compresses the refrigerant into a high-temperature and high-pressure gaseous state (such as the temperature rising to 85-95℃), and sends it to the second three-way shut-off valve through the four-way reversing valve D port → E port.

[0133] "Heat release and temperature compensation" in the first indoor heat exchanger: The high-temperature and high-pressure refrigerant enters the first indoor heat exchanger 31 directly through the first port of the second three-way shut-off valve and then through the second port. At this time, the refrigerant has not passed through the throttling device, so the first indoor heat exchanger acts as a condenser, releasing a large amount of heat to the indoor air, and the refrigerant temperature drops to 45-55℃, becoming a medium-temperature and high-pressure liquid or gas-liquid mixture.

[0134] The throttling device "reduces pressure and temperature": After the refrigerant flows out from the heat exchanger in the first room, it passes through the first throttling device 41 and the second throttling device 42 in sequence. The pressure drops sharply (from high pressure to low pressure), and the temperature drops sharply to 5-8℃, becoming a low-temperature and low-pressure gas-liquid mixture.

[0135] The second indoor heat exchanger performs "heat absorption and dehumidification": Low-temperature, low-pressure refrigerant enters the second indoor heat exchanger 32. At this point, the refrigerant is throttled and depressurized before entering the heat exchanger. Therefore, the second indoor heat exchanger acts as an evaporator, absorbing a large amount of heat from the indoor air. As the indoor air flows through this area, its temperature is lowered below the dew point, and water vapor in the air condenses into water droplets (achieving dehumidification, such as reducing relative humidity from 85% to 55%), and the air temperature temporarily drops to 14-15℃.

[0136] Air "thermal balance air supply": The air dehumidified by the second indoor heat exchanger is reheated by the heat released by the first indoor heat exchanger, and the final air supply temperature is stabilized at 20-25℃ (which is not lower than the preservation temperature of the exhibits and solves the problem of high humidity).

[0137] Refrigerant "recirculation": After absorbing heat in the second indoor heat exchanger, the refrigerant becomes a low-pressure gaseous state, and returns to the compressor for recompression through the upper pipeline of the second indoor heat exchanger → compressor return pipe, completing the indoor closed loop (without exchanging heat with the outdoor environment throughout the process).

[0138] The key to "dehumidifying without relying on outdoor environments and even at low temperatures"

[0139] Traditional air conditioners rely on outdoor condensers for heat dissipation, and in low-temperature environments, the cooling cycle is prone to failure due to excessively low outdoor temperatures; however, in this mode:

[0140] The refrigerant does not pass through the outdoor condenser at all, forming a closed loop of "compressor → indoor heat exchanger → compressor", completely eliminating the limitations of the system caused by the low outdoor temperature;

[0141] The compressed heat released by the first indoor heat exchanger directly heats the indoor air, offsetting the cooling effect of the second indoor heat exchanger and preventing the indoor temperature from dropping further during dehumidification (e.g., from 12℃ to 20-25℃).

[0142] It does not require the outdoor cooling system to be activated; it achieves stable dehumidification in low-temperature environments solely through the combined action of indoor "heat release and heat absorption for dehumidification".

[0143] Example 5 employs a series piping design of "bypass outdoor condenser + independent indoor circulation," allowing the first and second indoor heat exchangers to function as "condensers (heat release and temperature compensation)" and "evaporators (heat absorption and dehumidification)" respectively. This, combined with the refrigerant's "heat generation-heat release-pressure reduction-heat absorption" process, achieves independent dehumidification in low-temperature environments. Its core solution addresses the "dehumidification blind spot" under low-temperature, high-humidity conditions.

[0144] Breaking through the limitation of traditional air conditioners that "cannot start cooling at low temperatures", it can still dehumidify stably when the ambient temperature is below the cooling safety threshold;

[0145] The compressor uses its heat to heat the air, preventing the indoor temperature from dropping further during dehumidification and ensuring a stable ambient temperature.

[0146] It effectively reduces indoor humidity, minimizing the risk of condensation and corrosion on equipment and exhibits, and is suitable for dehumidification needs in low-temperature, high-humidity environments such as museums and archives.

[0147] Example 6. This example is based on Example 3, such as... Figure 3 As shown, the air conditioning system includes a parallel piping structure, in which:

[0148] The first port of the first three-way shut-off valve 51 is directly connected to the second port, and the third port is not connected to other ports; the second port of the second three-way shut-off valve 52 is directly connected to the third port, and the first port is not connected to other ports; the D port 81 and C port 84 of the four-way reversing valve 8 are directly connected, and the E port 82 and S port 83 are directly connected; the outlet of the outdoor condenser 2 is connected to the first port of the first three-way shut-off valve 51 via a pipeline, and the second port of the first three-way shut-off valve 51 is divided into two branches via a pipeline: the first branch is connected in sequence to the first throttling device 41, the first indoor heat exchanger 31, the second port and the third port of the second three-way shut-off valve 52, and is connected to the return port of the compressor 1 via a pipeline; the second branch is connected in sequence to the second throttling device 42 and the second indoor heat exchanger 32, and is connected to the return port of the compressor 1 via a pipeline.

[0149] This embodiment shows the piping structure for conventional refrigeration mode. The refrigerant flow path is as follows: high-temperature and high-pressure refrigerant discharged from compressor 1 → D port 81 of four-way reversing valve 8 → C port 84 → outdoor condenser 2 (heat release) → first port of first three-way shut-off valve 51 → after the second port, it splits into two paths:

[0150] Branch 1: First throttling device 41 (pressure reduction) → First indoor heat exchanger 31 (acts as an evaporator for heat absorption and dehumidification) → Second three-way shut-off valve 52, second port → third port;

[0151] Branch 2: Second throttling device 42 (pressure reduction) → Second indoor heat exchanger 32 (acts as an evaporator for heat absorption and dehumidification) → Upper pipe of the second indoor heat exchanger 32;

[0152] After the two refrigerant lines are combined, the return gas line of compressor 1 is connected to the return gas line of compressor 1.

[0153] Example 6 (Conventional Cooling Mode)

[0154] Scenario: Suppose that on a summer afternoon, the indoor temperature in a data center server room rises to 30°C due to full server load, resulting in a high heat load and a need for rapid cooling to 24°C. Example 6's conventional cooling mode specifically addresses this type of "efficient cooling under normal heat load" requirement.

[0155] In this mode, the system forms parallel pipelines by switching valves, and the status of the core components is as follows:

[0156] First three-way shut-off valve 51: The first port (connected to the outdoor condenser) is connected to the second port (connected to the lower pipe of the indoor heat exchanger), and the third port is closed;

[0157] Second three-way shut-off valve 52: The second port (connected to the first indoor heat exchanger) is connected to the third port (connected to the second indoor heat exchanger and the compressor return pipe), and the first port is closed;

[0158] The four-way reversing valve 8: the D port (connected to the compressor outlet) is connected to the C port (connected to the outdoor condenser);

[0159] First indoor heat exchanger 31 and second indoor heat exchanger 32: both function as evaporators (simultaneously absorbing heat and cooling down);

[0160] Throttling devices: The first throttling device 41 corresponds to the first indoor heat exchanger, and the second throttling device 42 corresponds to the second indoor heat exchanger, which respectively reduce the pressure of the two refrigerants.

[0161] Refrigerant flow and air handling process

[0162] Compressor "boosting heat generation": The compressor compresses the refrigerant into a high-temperature, high-pressure gaseous state (such as the temperature rising to 80-90℃), and sends it to the outdoor condenser through the four-way reversing valve D port → C port.

[0163] Outdoor condenser "heat dissipation and cooling": The high-temperature and high-pressure refrigerant dissipates heat to the outdoor air in the outdoor condenser (with the outdoor fan assisting in heat dissipation). If the temperature drops to 45-55℃, it becomes a medium-temperature and high-pressure liquid or gas-liquid mixture.

[0164] Refrigerant "splitting and throttling": After the high-pressure liquid refrigerant passes through the first port of the first three-way shut-off valve and then the second port, it is divided into two independent branches:

[0165] Branch 1: The refrigerant enters the first throttling device 41 to reduce pressure (pressure drops sharply). If the temperature drops to 7-10℃, it becomes a low-temperature, low-pressure gas-liquid mixture and enters the first indoor heat exchanger 31.

[0166] Branch 2: The refrigerant enters the second throttling device 42 to reduce pressure (pressure drops sharply). If the temperature drops to 7-10℃, it becomes a low-temperature, low-pressure gas-liquid mixture and enters the second indoor heat exchanger 32.

[0167] The dual-evaporator system allows for simultaneous heat absorption and cooling: the low-temperature refrigerant in two separate branches absorbs a large amount of heat from the indoor air in the first and second indoor heat exchangers (similar to two "indoor cold sources"). The indoor air flows through both evaporators simultaneously, causing the temperature to drop rapidly from 30°C to 24°C (50% faster than a single evaporator), and some of the water vapor in the air condenses due to the cooling (resulting in mild dehumidification).

[0168] Refrigerant "collection and return": After absorbing heat in the two indoor heat exchangers, the refrigerant becomes a low-pressure gaseous state. After being collected by the second three-way shut-off valve (branch 1: second port of the second three-way shut-off valve 52 → third port; branch 2: directly through the upper pipeline), it returns to the compressor through the compressor return pipe to complete the cycle.

[0169] The key to "dual evaporators in parallel for rapid cooling"

[0170] Traditional air conditioners, if they only use an evaporator for cooling, have a limited heat exchange area and a slow cooling speed; however, in this mode:

[0171] The first and second indoor heat exchangers are arranged side by side as evaporators, doubling the heat exchange area and allowing more heat to be absorbed from the room at the same time.

[0172] The refrigerant is divided into two independent flow paths with independent heat exchange to avoid a decrease in heat exchange efficiency caused by excessive flow in a single path;

[0173] Combined with a fan to enhance air circulation, it allows indoor heat to be quickly removed, achieving "rapid cooling under high load".

[0174] Example 6, through a parallel piping design, allows both the first and second indoor heat exchangers to simultaneously function as "evaporators (absorbing heat for cooling)," achieving high-efficiency cooling under high loads by coordinating with the refrigerant's "branching and throttling - parallel heat exchange" process. Its core solution addresses the problem of insufficient cooling efficiency under conventional heat load conditions.

[0175] The parallel connection of dual evaporators increases the heat exchange area and improves the cooling speed, meeting the rapid cooling needs of high-load scenarios such as data centers and precision workshops;

[0176] By controlling the refrigerant flow through separate throttling circuits, the heat exchange efficiency of each evaporator is optimized.

[0177] It provides both cooling and mild dehumidification, maintaining indoor temperature and humidity balance and improving environmental comfort and equipment operational stability.

[0178] Example 7. This example is based on Example 4. To clarify the correspondence between the low-load, high-efficiency dehumidification mode and the pipeline structure, the technical solution is as follows:

[0179] like Figure 1 As shown, the low-load, high-efficiency dehumidification pipeline structure of the air conditioning system is the series pipeline structure described in Example 4.

[0180] When the sensor detects that the indoor humidity exceeds the standard and the environmental heat load is low (such as the indoor temperature being close to or below the set lower limit), the controller automatically controls the valve system to switch to this pipeline structure.

[0181] In this mode, the system uses the condensation heat of the first indoor heat exchanger to reheat the dehumidified air to compensate for the dehumidification. This avoids excessive cooling without additional energy consumption. While effectively reducing the absolute humidity in the room, it ensures that the supply air temperature remains stable within the set range, thus meeting the precise humidity control needs of low-load, high-humidity scenarios.

[0182] Example 8. This example is based on Example 5. To clarify the correspondence between the low-temperature independent dehumidification mode and the pipeline structure, the technical solution is as follows:

[0183] like Figure 2 As shown, the low-temperature independent dehumidification pipeline structure of the air conditioning system is the series pipeline structure described in Example 5.

[0184] When the sensor detects that the indoor temperature is lower than the safe start temperature for cooling but the humidity exceeds the standard (e.g., ambient temperature ≤15℃ and relative humidity ≥70%), the controller automatically controls the valve system to switch to this pipeline structure.

[0185] In this mode, the refrigerant is completely bypassed by the outdoor condenser, and dehumidification is achieved through a closed loop of "condensation heat release - evaporation heat absorption" in the indoor heat exchanger. The air is heated by compression heat to offset the cooling effect, breaking through the low-temperature start-up limitation of traditional air conditioners and ensuring stable dehumidification function in low-temperature and high-humidity environments.

[0186] Example 9. This example is based on Example 6. To clarify the correspondence between the conventional refrigeration mode and the piping structure, the technical solution is as follows:

[0187] like Figure 3 As shown, the conventional refrigeration piping structure of the air conditioning system is the parallel piping structure described in Example 6. When the sensor detects that the indoor temperature is higher than the set value and the heat load is normal (e.g., indoor temperature ≥ set value + 2℃), the controller automatically controls the valve system to switch to this piping structure.

[0188] In this mode, the first and second indoor heat exchangers work in parallel as evaporators, increasing the heat exchange area and precisely controlling the refrigerant flow through branch throttling. Combined with the fan to enhance heat exchange, the indoor temperature can be quickly reduced to meet the high-efficiency cooling requirements under normal heat loads. At the same time, it also provides mild dehumidification to maintain the balance of ambient temperature and humidity.

[0189] Example 10. This example is based on Examples 1-9, which are not shown in the figures. To improve the ease of operation when switching modes, the technical solution is as follows:

[0190] The air conditioning system is equipped with a controller, which is connected to the controller signal and has function keys corresponding to the normal cooling mode, low load high efficiency dehumidification mode, and low temperature independent dehumidification mode.

[0191] Users can manually switch operating modes by pressing the function keys on the controller according to actual working conditions:

[0192] Press the "Normal Cooling Mode" button, and the controller will switch the valve system to a parallel piping structure.

[0193] Press the "Low Load High Efficiency Dehumidification Mode" button to switch to one of the corresponding series pipeline structures;

[0194] Press the "Low Temperature Independent Dehumidification Mode" button to switch to the corresponding series piping structure.

[0195] Meanwhile, the controller continuously receives sensor feedback signals to ensure the safety and stability of mode switching and operation.

[0196] By adding a controller, manual and quick mode switching is achieved, improving operational flexibility and adapting to the personalized temperature and humidity control needs of scenarios such as data centers and precision laboratories.

[0197] The above-disclosed embodiments are merely preferred embodiments of the present utility model and should not be construed as limiting the scope of the present utility model. Therefore, any equivalent variations made in accordance with the scope of the present utility model application shall still fall within the scope of the present utility model.

Claims

1. An air conditioning system with high-efficiency dehumidification function, comprising a compressor (1), an outdoor condenser (2), an indoor heat exchanger (3), a throttling device (4), a valve system (5), a fan (6), a controller, and sensors; characterized in that, The indoor heat exchanger (3) includes a first indoor heat exchanger (31) and a second indoor heat exchanger (32). The two are switched to be installed in parallel or in series in the pipeline through a valve system. Both can be switched to be evaporators through a valve system. The first indoor heat exchanger (31) can be switched to be a condenser through a valve system. The outdoor condenser (2), the first indoor heat exchanger (31) and the second indoor heat exchanger (32) are all connected to the corresponding fan (6); The throttling device (4) includes a first throttling device (41) connected in series with the lower pipe of the first indoor heat exchanger (31) and a second throttling device (42) connected in series with the lower pipe of the second indoor heat exchanger (32). The sensors include indoor and outdoor temperature and humidity sensors and pipeline temperature sensors; The valve system (5) includes a check valve (7) and: The first three-way shut-off valve (51) and the second three-way shut-off valve (52) are used to control the parallel or series switching and mode switching of the first indoor heat exchanger (31) and the second indoor heat exchanger (32); A four-way reversing valve (8) is used to switch the overall flow direction of the refrigerant. The inlet end of the four-way reversing valve (8) is connected to the outlet of the compressor via a pipeline, and the outlet end is selectively connected to the outdoor condenser (2) or the second three-way shut-off valve (52) via a pipeline. The other end of the outdoor condenser (2) is connected to the first three-way shut-off valve (51) via a pipeline; The return port of the compressor (1) is connected by a pipeline to the upper pipeline of the second indoor heat exchanger (32) and the second three-way shut-off valve (52); The sensor, compressor (1), fan (6), valve system (5) and throttling device (4) are electrically connected to the controller.

2. The air conditioning system according to claim 1, characterized in that, The first port of the first three-way shut-off valve (51) is connected to the outdoor condenser (2) via a pipeline, the second port is connected to the lower pipeline of the indoor heat exchanger (3) via a pipeline, the third port is connected to the inlet of the one-way valve (7) via a pipeline, and the outlet of the one-way valve (7) is connected to the upper pipeline of the first indoor heat exchanger (31) via a pipeline. The first port of the second three-way shut-off valve (52) is connected to the four-way reversing valve (8) via a pipeline, the second port is connected to the upper pipeline of the first indoor heat exchanger (31) via a pipeline, and the third port is connected to the upper pipeline of the second indoor heat exchanger (32) and the return gas pipeline of the compressor (1) via a pipeline.

3. The air conditioning system according to claim 2, characterized in that, The four-way directional valve (8) includes a D port (81), an E port (82), an S port (83), and a C port (84); The D interface (81) is connected to the outlet of the compressor (1) via a pipe; The E port (82) is connected to the first port of the second three-way shut-off valve (52) via a pipeline; The S-interface (83) is connected to the return gas line of the compressor (1) via a pipeline; The C interface (84) is connected to the outdoor condenser (2) via a pipe.

4. The air conditioning system according to claim 3, characterized in that, The air conditioning system includes a series piping structure, wherein: The first port of the first three-way shut-off valve (51) is directly connected to the third port, and the second port is not connected to other ports; the first port of the second three-way shut-off valve (52) is directly connected to the third port, and the second port is not connected to other ports; the D port (81) and C port (84) of the four-way reversing valve (8) are directly connected, and the E port (82) and S port (83) are directly connected. The outlet of the outdoor condenser (2) is connected in sequence via pipeline to the first port and the third port of the first three-way shut-off valve (51), the one-way valve (7), the first indoor heat exchanger (31), the first throttling device (41), the second throttling device (42), and the second indoor heat exchanger (32) is connected via pipeline to the return port of the compressor (1).

5. The air conditioning system according to claim 3, characterized in that, The air conditioning system includes another series piping structure, in which: The first port of the first three-way shut-off valve (51) is directly connected to the third port, and the second port is not connected to other ports; the first port of the second three-way shut-off valve (52) is directly connected to the second port, and the third port is not connected to other ports; the D port (81) and E port (82) of the four-way reversing valve (8) are directly connected, and the S port (83) and C port (84) are directly connected. The outlet of the compressor (1) is connected to the D port (81) and E port (82) of the four-way reversing valve (8) via a pipeline, the first port of the second three-way shut-off valve (52), the second port of the second three-way shut-off valve (52), the first indoor heat exchanger (31), the first throttling device (41), the second throttling device (42), the second indoor heat exchanger (32), and the return port of the compressor (1) via a pipeline.

6. The air conditioning system according to claim 3, characterized in that, The air conditioning system includes a parallel piping structure, wherein: The first port of the first three-way shut-off valve (51) is directly connected to the second port, and the third port is not connected to other ports; the second port of the second three-way shut-off valve (52) is directly connected to the third port, and the first port is not connected to other ports; the D port (81) and C port (84) of the four-way reversing valve (8) are directly connected, and the E port (82) and S port (83) are directly connected. The outlet of the outdoor condenser (2) is connected to the first port of the first three-way shut-off valve (51) via a pipeline, and the second port of the first three-way shut-off valve (51) is divided into two branches via a pipeline: The first branch line connects in sequence to the first throttling device (41), the first indoor heat exchanger (31), the second port and the third port of the second three-way shut-off valve (52), and then connects to the return port of the compressor (1) via a pipeline; The second branch line connects the second throttling device (42) and the second indoor heat exchanger (32) in sequence, and then connects to the return port of the compressor (1) via a pipeline.

7. The air conditioning system according to claim 4, characterized in that, It also includes a low-load, high-efficiency dehumidification pipeline structure, wherein the series pipeline structure is the low-load, high-efficiency dehumidification pipeline structure.

8. The air conditioning system according to claim 5, characterized in that, It also includes a low-temperature independent dehumidification pipeline structure, wherein the series pipeline structure is the low-temperature independent dehumidification pipeline structure.

9. The air conditioning system according to claim 6, characterized in that, It also includes a conventional refrigeration piping structure, wherein the parallel piping structure is the conventional refrigeration piping structure.

10. The air conditioning system according to any one of claims 1-9, characterized in that, The air conditioning system is also equipped with a controller, which is connected to the controller via a signal; the controller is equipped with function keys for a normal cooling mode, a low-load high-efficiency dehumidification mode, and a low-temperature independent dehumidification mode.

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