Composite Air Conditioning System with Coupled Solid Adsorption Dehumidification Heat Exchanger and its Operation Method

Abstract

This invention relates to the field of air conditioning dehumidification technology, and in particular to a composite air conditioning system coupled with a solid adsorption dehumidification heat exchanger and its operation method. The composite air conditioning system includes an outdoor air inlet duct and an indoor return air duct, both connected to the air inlet of a finned tube heat exchanger via a first three-way ventilation valve. The air outlet of the finned tube heat exchanger is connected to the air inlet of a first fan, and the air outlet of the first fan is connected to the indoor supply air duct and the outdoor exhaust air duct via a third three-way ventilation valve. The outdoor air inlet duct and the indoor return air duct are both connected to the air inlet of a dehumidification heat exchanger via a second three-way ventilation valve. The air outlet of the dehumidification heat exchanger is connected to the air inlet of a second fan, and the air outlet of the second fan is connected to the indoor supply air duct and the outdoor exhaust air duct via a fourth three-way ventilation valve. This invention, by using a dehumidification heat exchanger in conjunction with a finned tube heat exchanger, fully utilizes the condensing cooling capacity and waste heat of the dehumidification cycle to drive the adsorption and desorption process of moisture in the air by the desiccant, reducing the energy consumption of dehumidification and humidification, thereby improving the energy efficiency of the system.

Description

Technical Field

[0001] This invention relates to the field of air conditioning dehumidification technology, and in particular to a composite air conditioning system coupled with a solid adsorption dehumidification heat exchanger and its operation method. Background Technology

[0002] With the intensification of global climate change, the acceleration of urbanization, and the increasing demand for healthy and livable environments, building air humidity control technology has become an important research direction in the field of HVAC. The traditional air conditioning system design concept, which focuses on temperature regulation, is no longer sufficient to meet the increasingly complex needs of indoor environmental control.

[0003] Statistics show that approximately 30% of buildings worldwide suffer from dampness, resulting in respiratory illnesses, allergies, and building syndromes that cause billions of dollars in economic losses annually. High humidity environments (relative humidity > 60%) provide ideal breeding conditions for microorganisms such as mold spores and dust mites, whose metabolic products directly threaten human health. For example, Aspergillus multiplies three times faster at humidity levels above 70%, becoming a significant contributing factor to asthma and immune system diseases. Furthermore, the building sector accounts for 36% of global end-use energy consumption, with HVAC systems accounting for 40-60% of that. While traditional split-type air conditioners can cool the air, their dehumidification capacity is strongly coupled with temperature regulation, often leading to over-dehumidification or uncontrolled humidity.

[0004] There is an urgent need to develop integrated air conditioning equipment with heating, cooling, and humidity control functions. This equipment can effectively control indoor humidity while maintaining energy efficiency and environmental friendliness, enabling independent control of indoor air temperature and humidity, and fundamentally cutting off the transmission chain of pathogens. Using solid adsorption dehumidifying materials to create heat exchangers for air dehumidification can avoid over-cooling, and the desiccant can be regenerated using low-grade heat sources.

[0005] Therefore, this invention aims to provide a composite air conditioning system and its operation method that couples a solid adsorption dehumidification heat exchanger, solving the problem that the cooling coil in the existing air conditioning system must simultaneously handle latent heat load and sensible heat load, improving the efficiency of the humidity control process, and reducing air conditioning energy consumption. Summary of the Invention

[0006] The first objective of this invention is to provide a composite air conditioning system coupled with a solid adsorption dehumidification heat exchanger, which can improve the efficiency of the air humidity control process, reduce heat loss, and has both dehumidification and cooling, heating and humidification functions.

[0007] The second objective of this invention is to provide a method for operating the aforementioned composite air conditioning system.

[0008] This invention provides a composite air conditioning system coupled with a solid adsorption dehumidification heat exchanger, including an outdoor air inlet duct and an indoor return air duct. Both the outdoor air inlet duct and the indoor return air duct are connected to the air inlet end of a finned tube heat exchanger through a first three-way ventilation valve. The air outlet end of the finned tube heat exchanger is connected to the air inlet of a first fan. The air outlet of the first fan is connected to the indoor air supply duct and the outdoor air exhaust duct through a third three-way ventilation valve.

[0009] Both the outdoor air inlet duct and the indoor return air duct are connected to the air inlet of the dehumidifying heat exchanger through the second and third ventilation valves. The air outlet of the dehumidifying heat exchanger is connected to the air inlet of the second fan. The air outlet of the second fan is connected to the indoor air supply duct and the outdoor air exhaust duct through the fourth and third ventilation valves.

[0010] The dehumidifying heat exchanger is connected to the finned tube heat exchanger through a compressor system, and a loop is formed between the dehumidifying heat exchanger and the finned tube heat exchanger, in which the refrigerant circulates.

[0011] The surface of the dehumidifying heat exchanger is coated with a solid adsorbent material.

[0012] Preferably, the compressor system includes a four-way valve, a compressor, a gas-liquid separator, and a liquid receiver. The first port of the four-way valve is connected to the first refrigerant port of the finned tube heat exchanger, the second port of the four-way valve is connected to the compressor discharge port, the third port of the four-way valve is connected to the first refrigerant port of the dehumidifying heat exchanger, the fourth port of the four-way valve is connected to the inlet of the gas-liquid separator, the outlet of the gas-liquid separator is connected to the compressor inlet, the second refrigerant port of the finned tube heat exchanger is connected to the first port of the liquid receiver, and the second port of the liquid receiver is connected to the second refrigerant port of the dehumidifying heat exchanger.

[0013] Preferably, a throttling valve is provided between the second port of the liquid storage tank and the second port of the refrigerant in the dehumidification heat exchanger.

[0014] Preferably, a first fan housing is provided on the outside of the first fan, the finned tube heat exchanger is disposed inside the first fan housing, the air inlet of the first fan housing is connected to the first port of the first three ventilation valve, and the air outlet of the first fan housing is connected to the first port of the corresponding third three ventilation valve; a second fan housing is provided on the outside of the second fan, the dehumidifying heat exchanger is disposed inside the second fan housing, the air inlet of the second fan housing is connected to the first port of the second three ventilation valve, and the air outlet of the second fan housing is connected to the first port of the corresponding fourth three ventilation valve.

[0015] Preferably, the indoor return air duct, the outdoor air inlet duct, the indoor supply air duct, and the outdoor exhaust air duct each have three ports; the first port of the indoor return air duct is connected to the indoor environment, the second port of the indoor return air duct is connected to the third port of the first and third ventilation valves, and the third port of the indoor return air duct is connected to the third port of the second and third ventilation valves; the first port of the outdoor air inlet duct is connected to the outdoor environment, the second port of the outdoor air inlet duct is connected to the second port of the first and third ventilation valves, and the third port of the outdoor air inlet duct is connected to the second port of the second and third ventilation valves; the first port of the indoor supply air duct is connected to the indoor environment, the second port of the indoor supply air duct is connected to the third port of the third ventilation valve, and the third port of the indoor supply air duct is connected to the third port of the fourth ventilation valve; the first port of the outdoor exhaust air duct is connected to the outdoor environment, the second port of the outdoor exhaust air duct is connected to the second port of the third ventilation valve, and the third port of the outdoor exhaust air duct is connected to the second port of the fourth ventilation valve.

[0016] The present invention also provides an operation method for a composite air conditioning system coupled with a solid adsorption dehumidification heat exchanger. The operation method includes a summer mode and a winter mode. The summer mode includes an adsorption dehumidification mode and a condensation dehumidification mode, and the winter mode includes a heating mode and a heating and humidification mode.

[0017] Preferably, in the adsorption dehumidification mode, the first and second ports of the first three-way ventilation valve are open, and the third port is closed; the first and third ports of the second three-way ventilation valve are open, and the second port is closed; the first and second ports of the third three-way ventilation valve are open, and the third port is closed; the first and third ports of the fourth three-way ventilation valve are open, and the second port is closed.

[0018] The refrigerant flows from the compressor discharge port through the four-way valve, the finned tube heat exchanger, the liquid receiver, the expansion valve, and the dehumidification heat exchanger in sequence, and then enters the gas-liquid separator again through the four-way valve, and finally flows back to the compressor;

[0019] The indoor air to be treated flows sequentially through the indoor return air duct, the second and third ventilation valves, the dehumidification heat exchanger, the second fan, and the fourth and third ventilation valves, and is then sent back to the room through the indoor supply air duct;

[0020] Outdoor air flows sequentially through the outdoor air inlet pipe, the first and third ventilation valves, the finned tube heat exchanger, the first fan, and the third ventilation valve, and is discharged to the outside through the outdoor exhaust pipe.

[0021] Preferably, when the dehumidifying heat exchanger is saturated with moisture, the condensation dehumidification mode can be activated, in which the first and third ports of the first three-ventilation valve are open and the second port is closed; the first and second ports of the second three-ventilation valve are open and the third port is closed; the first and third ports of the third three-ventilation valve are open and the second port is closed; and the first and second ports of the fourth three-ventilation valve are open and the third port is closed.

[0022] The refrigerant flows from the compressor discharge port through the four-way valve, the dehumidifying heat exchanger, the throttling valve, the liquid receiver, and the finned tube heat exchanger in sequence, and then enters the gas-liquid separator again through the four-way valve, and finally flows back to the compressor;

[0023] The indoor air to be treated flows sequentially through the indoor return air duct, the first and third ventilation valves, the finned tube heat exchanger, the first fan, and the third ventilation valve, and is then sent back to the room through the indoor supply air duct.

[0024] Outdoor air flows sequentially through the outdoor air inlet pipe, the second and third ventilation valves, the dehumidifier heat exchanger, the second fan, and the fourth and third ventilation valves, and is discharged to the outside through the outdoor exhaust pipe.

[0025] Preferably, in the heating mode, the first and third ports of the first three-way ventilation valve are connected, and the second port is closed; the first and second ports of the second three-way ventilation valve are connected, and the third port is closed; the first and third ports of the third three-way ventilation valve are connected, and the second port is closed; the first and second ports of the fourth three-way ventilation valve are connected, and the third port is closed.

[0026] The refrigerant flows from the compressor discharge port through the four-way valve, the finned tube heat exchanger, the liquid receiver, the expansion valve, and the dehumidification heat exchanger in sequence, and then enters the gas-liquid separator again through the four-way valve, and finally flows back to the compressor;

[0027] The indoor air to be treated flows sequentially through the indoor return air duct, the first and third ventilation valves, the finned tube heat exchanger, the first fan, and the third ventilation valve, and is then sent back to the room through the indoor supply air duct.

[0028] Outdoor air flows sequentially through the outdoor air inlet pipe, the second and third ventilation valves, the dehumidifier heat exchanger, the second fan, and the fourth and third ventilation valves, and is discharged to the outside through the outdoor exhaust pipe.

[0029] Preferably, when the dehumidifying heat exchanger is saturated with moisture, the heating and humidifying mode can be activated, with the first and second ports of the first three-way ventilation valve connected and the third port closed; the first and third ports of the second three-way ventilation valve connected and the second port closed; the first and second ports of the third three-way ventilation valve connected and the third port closed; and the first and third ports of the fourth three-way ventilation valve connected and the second port closed.

[0030] The refrigerant flows from the compressor discharge port through the four-way valve, the dehumidifying heat exchanger, the throttling valve, the liquid receiver, and the finned tube heat exchanger in sequence, and then enters the gas-liquid separator again through the four-way valve, and finally flows back to the compressor;

[0031] The indoor air to be treated flows sequentially through the indoor return air duct, the second and third ventilation valves, the dehumidification heat exchanger, the second fan, and the fourth and third ventilation valves, and is then sent back to the room through the indoor supply air duct;

[0032] Outdoor air flows sequentially through the outdoor air inlet pipe, the first and third ventilation valves, the finned tube heat exchanger, the first fan, and the third ventilation valve, and is discharged to the outside through the outdoor exhaust pipe.

[0033] Beneficial effects:

[0034] This invention utilizes a dehumidifying heat exchanger in conjunction with a finned tube heat exchanger to fully leverage the evaporative cooling capacity and condensation waste heat of the dehumidifying cycle to drive the adsorption and desorption process of moisture in the air by the desiccant. Compared with traditional heat pump air conditioning systems, this reduces the energy consumption for dehumidification and humidification, thereby improving the system's energy efficiency. It also fully utilizes the cooling capacity generated by the dehumidifying refrigeration cycle, overcomes the unfavorable adsorption heat generated during the desiccant adsorption process, and simultaneously increases the evaporation temperature of the refrigeration cycle, thus maintaining a high dehumidification efficiency and achieving highly efficient dehumidification.

[0035] In this invention, the dehumidifying heat exchanger uses a surface solid adsorbent material as a desiccant for dehumidification. The surface of the dehumidifying heat exchanger is free of condensation, effectively inhibiting bacterial growth. The solid adsorbent material adheres to the surface of the dehumidifying heat exchanger using a metal surface desiccant coating technology. Compared to traditional rotary dehumidification systems, this method is simpler to manufacture, has lower investment costs, and is easier to install. Attached Figure Description

[0036] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0037] Figure 1 This is a flowchart of the adsorption dehumidification mode of the present invention;

[0038] Figure 2 This is a flowchart of the condensation dehumidification mode of the present invention;

[0039] Figure 3 This is a flowchart of the heating mode of the present invention;

[0040] Figure 4 This is a flowchart of the heating and humidification mode of the present invention.

[0041] Explanation of reference numerals in the attached figures:

[0042] 1-Dehumidifier heat exchanger, 2-Finned tube heat exchanger, 3-Four-way valve, 4-Compressor, 5-Gas-liquid separator, 6-Liquid storage tank, 7-Throttle valve, 8-First fan, 9-Second fan, 10-First three-way ventilation valve, 11-Second three-way ventilation valve, 12-Third three-way ventilation valve, 13-Fourth three-way ventilation valve, 14-Indoor return air duct, 15-Outdoor air inlet duct, 16-Indoor air supply duct, 17-Outdoor exhaust duct, 18-First fan housing, 19-Second fan housing. Detailed Implementation

[0043] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0044] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0045] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified. Furthermore, the terms "installed," "connected," and "linked" should be interpreted broadly; for example, they may refer to a fixed connection, a detachable connection, or an integral connection; they may refer to a mechanical connection or an electrical connection; they may refer to a direct connection or an indirect connection through an intermediate medium; and they may refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0046] Example 1

[0047] like Figure 1-4 As shown, a composite air conditioning system coupled with a solid adsorption dehumidification heat exchanger includes an outdoor air inlet duct 15 and an indoor return air duct 14. Both the outdoor air inlet duct 15 and the indoor return air duct 14 are connected to the air inlet of a finned tube heat exchanger 2 through a first three-way ventilation valve 10. The air outlet of the finned tube heat exchanger 2 is connected to the air inlet of a first fan 8. The air outlet of the first fan 8 is connected to an indoor supply air duct 16 and an outdoor exhaust air duct 17 through a third three-way ventilation valve 12.

[0048] Both the outdoor air inlet duct 15 and the indoor return air duct 14 are connected to the air inlet of the dehumidification heat exchanger 1 through the second three ventilation valve 11. The air outlet of the dehumidification heat exchanger 1 is connected to the air inlet of the second fan 9. The air outlet of the second fan 9 is connected to the indoor air supply duct 16 and the outdoor air exhaust duct 17 through the fourth three ventilation valve 13.

[0049] A first fan housing 18 is provided on the outside of the first fan 8. A finned tube heat exchanger 2 is installed inside the first fan housing 18. The air inlet of the first fan housing 18 is connected to the first port of the first three-way ventilation valve 10, and the air outlet of the first fan housing 18 is connected to the first port of the corresponding third three-way ventilation valve 12. A second fan housing 19 is provided on the outside of the second fan. A dehumidifying heat exchanger 1 is installed inside the second fan housing 19. The air inlet of the second fan housing 19 is connected to the first port of the second three-way ventilation valve 11, and the air outlet of the second fan housing 19 is connected to the first port of the corresponding fourth three-way ventilation valve 13.

[0050] The indoor return air duct 14, outdoor air inlet duct 15, indoor supply air duct 16, and outdoor exhaust air duct 17 are each equipped with three ports. The first port of the indoor return air duct 14 is connected to the indoor environment, the second port of the indoor return air duct 14 is connected to the third port of the first three-way ventilation valve 10, and the third port of the indoor return air duct 14 is connected to the third port of the second three-way ventilation valve 11. The first port of the outdoor air inlet duct 15 is connected to the outdoor environment, the second port of the outdoor air inlet duct 15 is connected to the second port of the first three-way ventilation valve 10, and the third port of the outdoor air inlet duct 15 is connected to the second port of the second three-way ventilation valve 11. The first port of the indoor supply air duct 16 is connected to the indoor environment, the second port of the indoor supply air duct 16 is connected to the third port of the third three-way ventilation valve 12, and the third port of the indoor supply air duct 16 is connected to the third port of the fourth three-way ventilation valve 13. The first port of the outdoor exhaust air duct 17 is connected to the outdoor environment, the second port of the outdoor exhaust air duct 17 is connected to the second port of the third three-way ventilation valve 12, and the third port of the outdoor exhaust air duct 17 is connected to the second port of the fourth three-way ventilation valve 13.

[0051] The dehumidifying heat exchanger 1 is formed by coating a solid adsorbent material onto the surface of the heat exchanger using a metal surface desiccant coating technology. The heat exchanger can be a traditional heat exchanger, such as a finned tube heat exchanger; the solid adsorbent material is a solid dehumidifying adsorbent material. The dehumidifier heat exchanger 1 is connected to the finned tube heat exchanger 2 via the compressor 4 system. The compressor 4 system includes a four-way valve 3, a compressor 4, a gas-liquid separator 5, and a liquid storage tank 6. The four-way valve 3 has four ports. The first port can be connected to the second and fourth ports, and the third port can be connected to the second and fourth ports. The first port of the four-way valve 3 is connected to the first refrigerant port of the finned tube heat exchanger 2. The second port of the four-way valve 3 is connected to the exhaust port of the compressor 4. The third port of the four-way valve 3 is connected to the first refrigerant port of the dehumidifier heat exchanger 1. The fourth port of the four-way valve 3 is connected to the inlet of the gas-liquid separator 5. The outlet of the gas-liquid separator 5 is connected to the air inlet of the compressor 4. The second refrigerant port of the finned tube heat exchanger 2 is connected to the first port of the liquid storage tank 6. The second port of the liquid storage tank 6 is connected to the second refrigerant port of the dehumidifier heat exchanger 1 via a throttling valve 7. A loop is formed between the dehumidifier heat exchanger 1 and the finned tube heat exchanger 2, and the refrigerant circulates in the loop.

[0052] Example 2

[0053] An operating method for a composite air conditioning system coupled with a solid adsorption dehumidification heat exchanger 1 is disclosed. This operating method includes a summer mode and a winter mode. The summer mode includes an adsorption dehumidification mode and a condensation dehumidification mode, while the winter mode includes a heating mode and a heating and humidification mode. By adjusting the first three-way ventilation valve 10, the second three-way ventilation valve 11, the third three-way ventilation valve 12, and the fourth three-way ventilation valve 13, and adjusting the four-way valve 3, the operating mode can be switched to achieve continuous dehumidification and cooling or heating and humidification of indoor air. Figures 1-4 The solid arrow indicates the direction of outdoor airflow, while the dashed arrow indicates the direction of indoor airflow to be treated.

[0054] Summer Mode:

[0055] In the adsorption dehumidification mode, the first and second ports of the first three-way ventilation valve 10 are open, and the third port is closed; the first and third ports of the second three-way ventilation valve 11 are open, and the second port is closed; the first and second ports of the third three-way ventilation valve 12 are open, and the third port is closed; the first and third ports of the fourth three-way ventilation valve 13 are open, and the second port is closed.

[0056] The refrigerant is heated and pressurized under the action of compressor 4, and then flows from the discharge port of compressor 4 through the second port of four-way valve 3 and the first port of four-way valve 3 in sequence, enters the finned tube heat exchanger 2 to release heat, and then flows through the liquid receiver 6 and the throttle valve 7 into the dehumidification heat exchanger 1. After that, it flows through the third port of four-way valve 3 and the fourth port of four-way valve 3 into the gas-liquid separator 5, and finally flows back to compressor 4 to complete one cycle.

[0057] Under the action of the second fan 9, the indoor air to be treated flows sequentially through the indoor return air duct 14, the second and third ventilation valves 11, the dehumidifier heat exchanger 1, the second fan 9, and the fourth and third ventilation valves 13, and is then sent back to the room through the indoor air supply duct 16. When the indoor air to be treated flows through the dehumidifier heat exchanger 1, the solid adsorbent material on the surface of the dehumidifier heat exchanger 1 absorbs moisture from the indoor air to be treated. The low-temperature and low-pressure refrigerant in the dehumidifier heat exchanger 1 carries away the adsorption heat generated during the adsorption of water vapor by the solid adsorbent material, thereby reducing the temperature and humidity of the indoor air to be treated.

[0058] Outdoor air, under the action of the first fan 8, flows sequentially through the outdoor air inlet duct 15, the first three-way ventilation valve 10, the finned tube heat exchanger 2, the first fan 8, and the third three-way ventilation valve 12, and is discharged to the outside through the outdoor exhaust duct 17. When the outdoor air flows through the finned tube heat exchanger 2, it carries away the heat released by the high-temperature and high-pressure refrigerant inside the finned tube heat exchanger 2.

[0059] When the solid adsorption material on the surface of the dehumidifying heat exchanger 1 becomes saturated with moisture, the condensation dehumidification mode can be activated. The equipment switches from adsorption dehumidification mode to condensation dehumidification mode. The first and third ports of the first three-way ventilation valve 10 are connected, and the second port is closed; the first and second ports of the second three-way ventilation valve 11 are connected, and the third port is closed; the first and third ports of the third three-way ventilation valve 12 are connected, and the second port is closed; the first and second ports of the fourth three-way ventilation valve 13 are connected, and the third port is closed.

[0060] The refrigerant is heated and pressurized under the action of the compressor 4. Then, it flows from the discharge port of the compressor 4 through the second port and the third port of the four-way valve 3, enters the dehumidification heat exchanger 1 to release heat, and then flows through the throttling valve 7 and the liquid receiver 6 into the finned tube heat exchanger 2. After absorbing heat in the finned tube heat exchanger 2, it enters the gas-liquid separator 5 through the first port and the fourth port of the four-way valve 3, and finally flows back to the compressor 4 to complete one cycle.

[0061] The indoor air to be treated flows sequentially through the indoor return air duct 14, the first three ventilation valve 10, and the finned tube heat exchanger 2 under the action of the first fan 8. When the indoor air to be treated flows through the finned tube heat exchanger 2, the temperature decreases under the action of the refrigerant in the finned tube heat exchanger 2. At the same time, the water vapor in the indoor air to be treated condenses, and the temperature and humidity of the air to be treated decrease. Then, it is sent back to the room through the first fan 8, the third three ventilation valve 12, and the indoor air supply duct 16.

[0062] Outdoor air flows sequentially through the outdoor air inlet pipe 15, the second and third ventilation valves 11, and the dehumidifier heat exchanger 1 under the action of the second fan 9. When the outdoor air flows through the dehumidifier heat exchanger 1, the solid adsorbent material on the surface of the dehumidifier heat exchanger 1, which is saturated with moisture, begins to desorb and release water vapor after being heated by the high temperature and high pressure refrigerant inside the dehumidifier heat exchanger 1. The outdoor air temperature and humidity rise, and then the air is discharged to the outside through the outdoor exhaust pipe 17 via the second fan 9, the fourth and third ventilation valves 13.

[0063] Winter Mode:

[0064] In heating mode, the first and third ports of the first three-way ventilation valve 10 are connected, and the second port is closed; the first and second ports of the second three-way ventilation valve 11 are connected, and the third port is closed; the first and third ports of the third three-way ventilation valve 12 are connected, and the second port is closed; the first and second ports of the fourth three-way ventilation valve 13 are connected, and the third port is closed.

[0065] The refrigerant is heated and pressurized under the action of compressor 4, and then flows from the discharge port of compressor 4 through the second port of four-way valve 3 and the first port of four-way valve 3 in sequence, enters the finned tube heat exchanger 2 to release heat, and then flows through the liquid receiver 6 and the throttle valve 7 into the dehumidification heat exchanger 1. After that, it flows through the third port of four-way valve 3 and the fourth port of four-way valve 3 into the gas-liquid separator 5, and finally flows back to compressor 4 to complete one cycle.

[0066] Under the action of the first fan 8, the indoor air to be treated flows through the indoor return air duct 14, the first three ventilation valve 10, and the finned tube heat exchanger 2 in sequence. When the indoor air to be treated flows through the finned tube heat exchanger 2, the high-temperature and high-pressure refrigerant releases heat in the finned tube heat exchanger 2, which raises the temperature of the indoor air to be treated. Then it is sent back to the room through the first fan 8, the third three ventilation valve 12, and the indoor air supply duct 16.

[0067] Outdoor air flows sequentially through the outdoor air inlet duct 15, the second and third ventilation valves 11, and the dehumidifier heat exchanger 1 under the action of the second fan 9. When the outdoor air flows through the dehumidifier heat exchanger 1, the solid adsorbent material on the surface of the dehumidifier heat exchanger 1 absorbs moisture from the outdoor air. The low-temperature and low-pressure refrigerant in the dehumidifier heat exchanger 1 carries away the adsorption heat generated during the adsorption of water vapor by the solid adsorbent material, thereby reducing the temperature and humidity of the outdoor air. Afterward, the air is discharged to the outside through the second fan 9, the fourth and third ventilation valves 13, and the outdoor exhaust duct 17.

[0068] When the solid adsorbent material on the surface of the dehumidifier heat exchanger 1 becomes saturated with moisture, the heating and humidification mode can be turned on. The equipment switches from the heating mode to the heating and humidification mode. The first and second ports of the first three-way ventilation valve 10 are connected, and the third port is closed; the first and third ports of the second three-way ventilation valve 11 are connected, and the second port is closed; the first and second ports of the third three-way ventilation valve 12 are connected, and the third port is closed; the first and third ports of the fourth three-way ventilation valve 13 are connected, and the second port is closed.

[0069] The refrigerant is heated and pressurized under the action of the compressor 4. Then, it flows from the discharge port of the compressor 4 through the second port and the third port of the four-way valve 3, enters the dehumidification heat exchanger 1 to release heat, and then flows through the throttling valve 7 and the liquid receiver 6 into the finned tube heat exchanger 2. After absorbing heat in the finned tube heat exchanger 2, it enters the gas-liquid separator 5 through the first port and the fourth port of the four-way valve 3, and finally flows back to the compressor 4 to complete one cycle.

[0070] Under the action of the second fan 9, the indoor air to be treated flows sequentially through the outdoor air inlet duct 15, the second and third ventilation valves 11, and the dehumidification heat exchanger 1. When the indoor air to be treated flows through the dehumidification heat exchanger 1, the solid adsorbent material on the surface of the dehumidification heat exchanger 1, which is saturated with moisture, begins to desorb and release water vapor after being heated by the high temperature and high pressure refrigerant inside the dehumidification heat exchanger 1. The temperature and humidity of the indoor air to be treated rise, and then it is discharged to the outside through the second fan 9, the fourth and third ventilation valves 13, and the outdoor exhaust duct 17.

[0071] Outdoor air flows sequentially through outdoor air inlet pipe 15, first ventilation valve 10, and finned tube heat exchanger 2 under the action of the first fan 8. When outdoor air flows through finned tube heat exchanger 2, the refrigerant in finned tube heat exchanger 2 evaporates and absorbs heat, and the temperature of outdoor air drops. Then, it is discharged to the outside through outdoor exhaust pipe 17 via the first fan 8, the third ventilation valve 12, and outdoor air inlet pipe 15.

[0072] This invention utilizes solid adsorption materials for dehumidification. Compared to traditional heat pump fresh air conditioning systems, the fresh air does not need to be cooled to very low temperatures, thus reducing energy consumption and improving system efficiency. The air treated by the solid adsorption material on the surface of the dehumidifier heat exchanger 1 effectively inhibits the diffusion and spread of harmful microorganisms and chemicals in the air. The solid adsorption material of this invention is attached to the fin surface of the solid adsorption dehumidifier heat exchanger 1. Compared to traditional adsorption dehumidification systems, this invention features a simpler manufacturing process, lower investment costs, and easier installation.

[0073] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A composite air conditioning system coupled with a solid adsorption dehumidification heat exchanger, characterized in that, It includes an outdoor air inlet duct and an indoor air return duct. Both the outdoor air inlet duct and the indoor air return duct are connected to the air inlet end of the finned tube heat exchanger through a first three-way ventilation valve. The air outlet end of the finned tube heat exchanger is connected to the air inlet of a first fan. The air outlet of the first fan is connected to the indoor air supply duct and the outdoor air exhaust duct through a third three-way ventilation valve. Both the outdoor air inlet duct and the indoor return air duct are connected to the air inlet of the dehumidifier heat exchanger through the second and third ventilation valves. The air outlet of the dehumidifier heat exchanger is connected to the air inlet of the second fan. The air outlet of the second fan is connected to the indoor air supply duct and the outdoor air exhaust duct through the fourth and third ventilation valves. The indoor return air duct, the outdoor air inlet duct, the indoor supply air duct, and the outdoor exhaust air duct are each equipped with three ports. The first port of the indoor return air duct is connected to the indoor environment, the second port of the indoor return air duct is connected to the third port of the first and third ventilation valves, and the third port of the indoor return air duct is connected to the third port of the second and third ventilation valves. The first port of the outdoor air inlet duct is connected to the outdoor environment, the second port of the outdoor air inlet duct is connected to the second port of the first and third ventilation valves, and the third port of the outdoor air inlet duct is connected to the second port of the second and third ventilation valves. The first port of the indoor supply air duct is connected to the indoor environment, the second port of the indoor supply air duct is connected to the third port of the third ventilation valve, and the third port of the indoor supply air duct is connected to the third port of the fourth ventilation valve. The first port of the outdoor exhaust air duct is connected to the outdoor environment, the second port of the outdoor exhaust air duct is connected to the second port of the third ventilation valve, and the third port of the outdoor exhaust air duct is connected to the second port of the fourth ventilation valve. The dehumidifying heat exchanger is connected to the finned tube heat exchanger through a compressor system, and a loop is formed between the dehumidifying heat exchanger and the finned tube heat exchanger, in which the refrigerant circulates. The surface of the dehumidifying heat exchanger is coated with a solid adsorbent material.

2. The composite air conditioning system with coupled solid adsorption dehumidification heat exchanger according to claim 1, characterized in that, The compressor system includes a four-way valve, a compressor, a gas-liquid separator, and a liquid receiver. The first port of the four-way valve is connected to the first refrigerant port of the finned tube heat exchanger, the second port of the four-way valve is connected to the compressor discharge port, the third port of the four-way valve is connected to the first refrigerant port of the dehumidifying heat exchanger, the fourth port of the four-way valve is connected to the inlet of the gas-liquid separator, the outlet of the gas-liquid separator is connected to the compressor inlet, the second refrigerant port of the finned tube heat exchanger is connected to the first port of the liquid receiver, and the second port of the liquid receiver is connected to the second refrigerant port of the dehumidifying heat exchanger.

3. The composite air conditioning system with coupled solid adsorption dehumidification heat exchanger according to claim 2, characterized in that, A throttling valve is provided between the second port of the liquid storage tank and the second port of the refrigerant in the dehumidification heat exchanger.

4. The composite air conditioning system with coupled solid adsorption dehumidification heat exchanger according to claim 1, characterized in that, The first fan has a first fan housing on its outer side, and the finned tube heat exchanger is installed inside the first fan housing. The air inlet of the first fan housing is connected to the first port of the first three-ventilation valve, and the air outlet of the first fan housing is connected to the first port of the corresponding third three-ventilation valve. The second fan has a second fan housing on its outer side, and the dehumidifying heat exchanger is installed inside the second fan housing. The air inlet of the second fan housing is connected to the first port of the second three-ventilation valve, and the air outlet of the second fan housing is connected to the first port of the corresponding fourth three-ventilation valve.

5. A method for operating a composite air conditioning system with a coupled solid adsorption dehumidification heat exchanger as described in any one of claims 1-4, characterized in that, The operating method includes a summer mode and a winter mode. The summer mode includes an adsorption dehumidification mode and a condensation dehumidification mode, and the winter mode includes a heating mode and a heating and humidification mode.

6. The operation method of the composite air conditioning system with coupled solid adsorption dehumidification heat exchanger according to claim 5, characterized in that, In the adsorption dehumidification mode, the first and second ports of the first three-way ventilation valve are open, and the third port is closed; the first and third ports of the second three-way ventilation valve are open, and the second port is closed; the first and second ports of the third three-way ventilation valve are open, and the third port is closed; the first and third ports of the fourth three-way ventilation valve are open, and the second port is closed. The refrigerant flows from the compressor discharge port sequentially through the four-way valve, the finned tube heat exchanger, the liquid receiver, the expansion valve, and the dehumidification heat exchanger, then enters the gas-liquid separator again through the four-way valve, and finally flows back to the compressor. The indoor air to be treated flows sequentially through the indoor return air duct, the second and third ventilation valves, the dehumidification heat exchanger, the second fan, and the fourth and third ventilation valves, and is then sent back to the room through the indoor supply air duct; Outdoor air flows sequentially through the outdoor air inlet pipe, the first and third ventilation valves, the finned tube heat exchanger, the first fan, and the third ventilation valve, and is discharged to the outside through the outdoor exhaust pipe.

7. The operation method of the composite air conditioning system with coupled solid adsorption dehumidification heat exchanger according to claim 5, characterized in that, When the dehumidifying heat exchanger is saturated with moisture, the condensation dehumidification mode can be activated. The first and third ports of the first three-way ventilation valve are open, and the second port is closed. The first and second ports of the second three-way ventilation valve are open, and the third port is closed. The first and third ports of the third three-way ventilation valve are open, and the second port is closed. The first and second ports of the fourth three-way ventilation valve are open, and the third port is closed. The refrigerant flows from the compressor discharge port sequentially through the four-way valve, the dehumidifying heat exchanger, the expansion valve, the liquid receiver, and the finned tube heat exchanger, then enters the gas-liquid separator again through the four-way valve, and finally flows back to the compressor. The indoor air to be treated flows sequentially through the indoor return air duct, the first and third ventilation valves, the finned tube heat exchanger, the first fan, and the third ventilation valve, and is then sent back to the room through the indoor supply air duct. Outdoor air flows sequentially through the outdoor air inlet pipe, the second and third ventilation valves, the dehumidifier heat exchanger, the second fan, and the fourth and third ventilation valves, and is discharged to the outside through the outdoor exhaust pipe.

8. The operation method of the composite air conditioning system with coupled solid adsorption dehumidification heat exchanger according to claim 5, characterized in that, In the heating mode, the first and third ports of the first three-way ventilation valve are connected, and the second port is closed; the first and second ports of the second three-way ventilation valve are connected, and the third port is closed; the first and third ports of the third three-way ventilation valve are connected, and the second port is closed; the first and second ports of the fourth three-way ventilation valve are connected, and the third port is closed. The refrigerant flows from the compressor discharge port sequentially through the four-way valve, the finned tube heat exchanger, the liquid receiver, the expansion valve, and the dehumidification heat exchanger, then enters the gas-liquid separator again through the four-way valve, and finally flows back to the compressor. The indoor air to be treated flows sequentially through the indoor return air duct, the first and third ventilation valves, the finned tube heat exchanger, the first fan, and the third ventilation valve, and is then sent back to the room through the indoor supply air duct. Outdoor air flows sequentially through the outdoor air inlet pipe, the second and third ventilation valves, the dehumidifier heat exchanger, the second fan, and the fourth and third ventilation valves, and is discharged to the outside through the outdoor exhaust pipe.

9. The operation method of the composite air conditioning system with coupled solid adsorption dehumidification heat exchanger according to claim 5, characterized in that, When the dehumidifying heat exchanger is saturated with moisture, the heating and humidification mode can be activated. The first and second ports of the first three-way ventilation valve are open, and the third port is closed. The first and third ports of the second three-way ventilation valve are open, and the second port is closed. The first and second ports of the third three-way ventilation valve are open, and the third port is closed. The first and third ports of the fourth three-way ventilation valve are open, and the second port is closed. The refrigerant flows from the compressor discharge port sequentially through the four-way valve, the dehumidifying heat exchanger, the expansion valve, the liquid receiver, and the finned tube heat exchanger, then enters the gas-liquid separator again through the four-way valve, and finally flows back to the compressor. The indoor air to be treated flows sequentially through the indoor return air duct, the second and third ventilation valves, the dehumidification heat exchanger, the second fan, and the fourth and third ventilation valves, and is then sent back to the room through the indoor supply air duct; Outdoor air flows sequentially through the outdoor air inlet pipe, the first and third ventilation valves, the finned tube heat exchanger, the first fan, and the third ventilation valve, and is discharged to the outside through the outdoor exhaust pipe.

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