Indoor unit for fresh air air conditioning system and fresh air air conditioning system

Abstract

This application relates to the field of household appliance technology, and discloses an indoor unit for a fresh air conditioning system. The indoor unit is equipped with a dehumidifying heat exchanger, a reheat heat exchanger, and a heat recovery heat exchanger. This allows the operating mode of the fresh air conditioning system to be controlled, recovering waste heat from the indoor air through the heat recovery heat exchanger, and configuring the dehumidifying and reheat heat exchangers to low-temperature and high-temperature states, respectively. This configuration enables constant-temperature dehumidification or heating-dehumidification of the indoor air without increasing the overall energy consumption of the fresh air conditioning system. This application also discloses a fresh air conditioning system.

Description

Technical Field

[0001] This application relates to the field of household appliance technology, such as to an indoor unit for a fresh air conditioning system and a fresh air conditioning system. Background Technology

[0002] With societal development, air conditioners have become increasingly widespread. To improve user experience, most air conditioners now include a dehumidification mode, especially in southern regions where dehumidification can significantly improve the quality of life. In dehumidification mode, current air conditioners typically use the indoor heat exchanger as an evaporator, causing moisture in the air flowing through it to condense and thus dehumidify. However, this dehumidification process also lowers the temperature of the air flowing through it. If this dehumidified air is then directly blown into the room, it will cause a drop in indoor temperature.

[0003] In related technologies, to achieve constant temperature dehumidification or heated dehumidification indoors, air conditioners typically include an electric auxiliary heating device between the indoor heat exchanger and the air outlet. This allows the electric auxiliary heating device to heat the dry air, achieving the effect of constant temperature dehumidification or heated dehumidification.

[0004] In the process of implementing the embodiments of this disclosure, at least the following problems were found in the related art:

[0005] In related technologies, existing air conditioners equipped with electric auxiliary heating devices need to continuously operate the electric auxiliary heating devices during the operation of constant temperature dehumidification and heating dehumidification, which increases the overall energy consumption of the air conditioner.

[0006] It should be noted that the information disclosed in the background section above is only used to enhance the understanding of the background of this application, and therefore may include information that does not constitute prior art known to those skilled in the art. Utility Model Content

[0007] To provide a basic understanding of some aspects of the disclosed embodiments, a brief summary is given below. This summary is not intended as a general commentary, nor is it intended to identify key / important components or describe the scope of protection of these embodiments, but rather as a prelude to the detailed description that follows.

[0008] This disclosure provides an indoor unit for a fresh air conditioning system and the fresh air conditioning system itself. The indoor unit is equipped with a dehumidifying heat exchanger, a reheat heat exchanger, and a heat recovery heat exchanger. By controlling the operating mode of the fresh air conditioning system, waste heat from the indoor air can be recovered through the heat recovery heat exchanger, and the dehumidifying heat exchanger and reheat heat exchanger can be configured to low-temperature and high-temperature states, respectively. This configuration allows for constant-temperature dehumidification or heating-dehumidification of the indoor environment without increasing the overall energy consumption of the fresh air conditioning system.

[0009] This disclosure provides an indoor unit for a fresh air conditioning system, comprising: a casing, an indoor heat exchanger assembly, and a heat recovery heat exchanger. The casing has an air inlet duct and an air outlet duct, which connect to the indoor and outdoor environments, respectively. The indoor heat exchanger assembly includes a dehumidifier heat exchanger and a reheat heat exchanger, which are sequentially arranged in the air inlet duct along the airflow direction. The heat recovery heat exchanger is disposed in the exhaust duct, and is connected to the dehumidifier heat exchanger via a first refrigerant pipeline. The airflow direction in the air inlet duct is defined as from the outdoor to the indoor environment, and the airflow direction in the exhaust duct is defined as from the indoor to the outdoor environment.

[0010] In some embodiments, the indoor unit further includes a pre-cooling heat exchanger. The pre-cooling heat exchanger is disposed within the air inlet duct, and the pre-cooling heat exchanger and the dehumidifying heat exchanger are arranged sequentially along the airflow direction within the air inlet duct; wherein the temperature of the pre-cooling heat exchanger is higher than the temperature of the dehumidifying heat exchanger.

[0011] In some embodiments, the indoor unit further includes an electric heating device. The electric heating device is disposed in the air inlet duct, and is located on the side of the reheat heat exchanger closer to the room.

[0012] In some embodiments, the indoor unit further includes: a first temperature sensor and a control device. The first temperature sensor is used to obtain a first temperature of the air flowing into the room through the air intake duct; the control device is electrically connected to the first temperature sensor and the electric heating device respectively; when the first temperature is less than or equal to a preset temperature, the control device is used to operate the electric heating device.

[0013] In some embodiments, when the difference between the preset temperature and the first temperature is greater than or equal to 6°C, the electric heating device is controlled to operate at a first power; when the difference between the preset temperature and the first temperature is less than 6°C and greater than or equal to 4°C, the electric heating device is controlled to operate at a second power; when the difference between the preset temperature and the first temperature is less than 4°C and greater than or equal to 2°C, the electric heating device is controlled to operate at a third power; and when the difference between the preset temperature and the first temperature is less than 2°C and greater than or equal to 0°C, the electric heating device is controlled to operate at a fourth power; wherein the first power, second power, third power, and fourth power decrease sequentially.

[0014] In some embodiments, the indoor unit further includes a humidifier and a humidity sensor. The humidifier is disposed in the air inlet duct and is used to humidify the air around it; the humidity sensor is used to acquire the indoor humidity; wherein, the control device is also electrically connected to the humidifier and the humidity sensor respectively; when the indoor humidity is less than or equal to a preset humidity, the control device is controlled to operate.

[0015] In some embodiments, the indoor unit further includes a filter assembly. The filter assembly is disposed at the air inlet of the air inlet duct and is used to filter outdoor air.

[0016] This disclosure also provides a fresh air conditioning system including: an outdoor unit and the aforementioned indoor unit for the fresh air conditioning system. The outdoor unit is equipped with a compressor; the aforementioned indoor unit for the fresh air conditioning system; wherein, an indoor heat exchanger assembly and a heat recovery heat exchanger are respectively connected to the compressor.

[0017] In some embodiments, the compressor includes a first exhaust port and a first intake port, a heat recovery heat exchanger is connected to the first exhaust port via a first refrigerant pipeline, and a dehumidification heat exchanger is connected to the first intake port via a first refrigerant pipeline.

[0018] In some embodiments, the compressor further includes a second discharge port and a second suction port, the reheat heat exchanger and the precooling heat exchanger are connected through a second refrigerant line, the reheat heat exchanger is connected to the second discharge port through the second refrigerant line, and the precooling heat exchanger is connected to the second suction port through the second refrigerant line.

[0019] The indoor unit and fresh air conditioning system for a fresh air conditioning system provided in this disclosure can achieve the following technical effects:

[0020] This disclosure provides an indoor unit for a fresh air conditioning system, comprising: a casing, an indoor heat exchanger assembly, and a heat recovery heat exchanger. The casing has an air inlet duct and an air outlet duct, which connect to the indoor and outdoor environments, respectively. The indoor heat exchanger assembly includes a dehumidifier heat exchanger and a reheat heat exchanger, which are sequentially arranged in the air inlet duct along the airflow direction. The heat recovery heat exchanger is located in the exhaust duct and is connected to the dehumidifier heat exchanger via a first refrigerant pipeline. The airflow direction in the air inlet duct is defined as from the outdoor to the indoor environment, and the airflow direction in the exhaust duct is defined as from the indoor to the outdoor environment. This allows the air in the air inlet duct to be dehumidified by the dehumidifier, and then the dry air to be heated by the reheat heat exchanger. Simultaneously, the heat recovery heat exchanger can recover waste heat from the indoor air in the exhaust duct and transfer the heat to the dehumidifier heat exchanger via the refrigerant in the first refrigerant pipeline, thereby reducing energy consumption. This setup allows for constant temperature dehumidification or heating dehumidification of the indoor environment without increasing the overall energy consumption of the fresh air conditioning system.

[0021] The above general description and the description below are exemplary and illustrative only and are not intended to limit this application. Attached Figure Description

[0022] One or more embodiments are illustrated by way of example with reference to the accompanying drawings. These illustrations and drawings do not constitute a limitation on the embodiments. Elements having the same reference numerals in the drawings are shown as similar elements. The drawings are not to be scaled. And wherein:

[0023] Figure 1 This is a schematic diagram of the structure of a fresh air conditioning system provided in an embodiment of this disclosure;

[0024] Figure 2 This is a schematic diagram of the structure of an indoor unit provided in an embodiment of this disclosure;

[0025] Figure 3 This is a schematic diagram of another fresh air conditioning system provided in this embodiment;

[0026] Figure 4 This is a schematic diagram of the refrigerant flow direction in a first refrigerant pipeline provided in an embodiment of this disclosure;

[0027] Figure 5 This is a schematic diagram of the refrigerant flow direction in a second refrigerant pipeline provided in an embodiment of this disclosure.

[0028] Figure label:

[0029] 11: Indoor unit; 12: Outdoor unit;

[0030] 20: Housing; 201: Air inlet duct; 202: Air outlet duct; 21: Air inlet; 22: Air supply outlet; 23: Return air outlet; 24: Air outlet;

[0031] 31: Dehumidification heat exchanger; 32: Reheat heat exchanger; 33: Heat recovery heat exchanger; 34: Precooling heat exchanger; 35: First refrigerant line; 36: Second refrigerant line;

[0032] 41: Electric heating device; 42: Humidification device; 43: Filter assembly; 44: Air intake fan; 45: Exhaust fan; 46: Compressor. Detailed Implementation

[0033] To provide a more detailed understanding of the features and technical content of the embodiments of this disclosure, the implementation of the embodiments of this disclosure will be described in detail below with reference to the accompanying drawings. The accompanying drawings are for illustrative purposes only and are not intended to limit the embodiments of this disclosure. In the following technical description, for ease of explanation, several details are used to provide a full understanding of the disclosed embodiments. However, one or more embodiments may still be implemented without these details. In other cases, well-known structures and devices may be simplified in their depiction to simplify the drawings.

[0034] The terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this disclosure are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate for the embodiments of this disclosure described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion.

[0035] In this disclosure, the terms "upper," "lower," "inner," "middle," "outer," "front," and "rear," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for better description of the embodiments of this disclosure and their implementations, and are not intended to limit the indicated devices, elements, or components to having a specific orientation, or to require them to be constructed and operated in a specific orientation. Furthermore, some of the aforementioned terms may be used to indicate other meanings besides orientation or positional relationship; for example, the term "upper" may in some cases indicate a dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in the embodiments of this disclosure according to the specific circumstances.

[0036] Furthermore, the terms "set up," "connect," and "fix" should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this disclosure according to the specific circumstances.

[0037] Unless otherwise stated, the term "multiple" means two or more.

[0038] In this embodiment of the disclosure, the character " / " indicates that the objects before and after it are in an "or" relationship. For example, A / B means: A or B.

[0039] The term "and / or" describes an association between objects, indicating that three relationships can exist. For example, A and / or B means: A or B, or A and B.

[0040] It should be noted that, unless otherwise specified, the embodiments and features described in the present disclosure can be combined with each other.

[0041] like Figures 1 to 5 As shown in the illustration, this disclosure provides an indoor unit 11 and a fresh air conditioning system for a fresh air conditioning system. The indoor unit 11 is equipped with a dehumidifying heat exchanger 31, a reheat heat exchanger 32, and a heat recovery heat exchanger 33. Thus, by controlling the operating mode of the fresh air conditioning system, waste heat from the indoor air can be recovered through the heat recovery heat exchanger 33, and the dehumidifying heat exchanger 31 and the reheat heat exchanger 32 can be configured to low-temperature and high-temperature states, respectively. This configuration allows for constant-temperature dehumidification or heating-dehumidification of the indoor environment without increasing the overall energy consumption of the fresh air conditioning system.

[0042] like Figures 1 to 5 As shown in the figure, an indoor unit 11 for a fresh air conditioning system provided in this embodiment includes: a casing 20, an indoor heat exchanger assembly, and a heat recovery heat exchanger 33. The casing 20 is provided with an air inlet duct 201 and an air outlet duct 202, which connect the indoor and outdoor areas respectively. The indoor heat exchanger assembly includes a dehumidifying heat exchanger 31 and a reheating heat exchanger 32, which are sequentially arranged in the air inlet duct 201 along the airflow direction. The heat recovery heat exchanger 33 is arranged in the air outlet duct 202, and the heat recovery heat exchanger 33 is connected to the dehumidifying heat exchanger 31 through a first refrigerant pipe 35. The airflow direction in the air inlet duct 201 is limited to from the outdoor area to the indoor area, and the airflow direction in the air outlet duct 202 is limited to from the indoor area to the outdoor area.

[0043] Specifically, the fresh air conditioning system also includes an outdoor unit 12. The indoor unit 11 is connected to the heat exchanger of the outdoor unit 12 via refrigerant piping and a four-way valve, so that the dehumidifying heat exchanger 31 and the reheat heat exchanger 32 can be in either cooling or heating mode, and the operating states of the dehumidifying heat exchanger 31 and the reheat heat exchanger 32 are independent of each other. For example, when the dehumidifying heat exchanger 31 is in cooling mode, the reheat heat exchanger 32 can be in heating mode. The heat recovery heat exchanger 33 is connected to the dehumidifying heat exchanger 31 via a first refrigerant piping 35 and is also connected to the outdoor unit 12 to form a refrigerant circulation loop. The air inlet channel is provided with an air inlet 21 and an air outlet 22, with the air inlet 21 connected to the outside and the air outlet 22 connected to the inside. An air supply fan is installed in the air inlet duct 201. The air supply fan is directed towards the air outlet 22 to draw outdoor air in from the air inlet 21 and blow it into the room through the air outlet 22. The outdoor air then flows sequentially through the dehumidification heat exchanger 31 and the reheat heat exchanger 32. The exhaust duct is equipped with a return air inlet 23 and an exhaust air outlet 24. The return air inlet 23 connects to the room, and the exhaust air outlet 24 connects to the outside. An exhaust fan 45 is installed in the exhaust duct 202. The exhaust fan 45 is directed towards the exhaust air outlet 24 to draw indoor air in from the return air inlet 23 and blow it out to the outside through the exhaust air outlet 24. The indoor air then flows through the heat recovery heat exchanger 33.

[0044] When the fresh air conditioning system is operating in dehumidification mode, the dehumidification heat exchanger 31 is in cooling mode, and the reheat heat exchanger 32 is in heating mode. At this time, as outdoor air flows sequentially through the dehumidification heat exchanger 31 and the reheat heat exchanger 32, the dehumidification heat exchanger 31 dehumidifies the outdoor air to make it dry, and the reheat heat exchanger 32 heats the dry air, ensuring that the air flowing into the room is dry and at a high temperature. This setup avoids excessive temperature differences between the incoming indoor air and the room temperature, preventing indoor temperature fluctuations and thus improving the user experience.

[0045] When the fresh air conditioning system is operating in heating mode, both the dehumidifier heat exchanger 31 and the reheat heat exchanger 32 can be in heating mode to heat the outdoor air. Simultaneously, as indoor air flows out to the outside through the exhaust duct 202, the heat recovery heat exchanger 33 recovers heat from the indoor air. The refrigerant in the heat recovery heat exchanger 33 absorbs heat and flows through the first refrigerant pipe 35 to the dehumidifier heat exchanger 31 to transfer heat. This configuration reduces the energy consumption of the fresh air conditioning system.

[0046] When the fresh air conditioning system is operating in cooling mode, both the dehumidifying heat exchanger 31 and the reheat heat exchanger 32 are in cooling mode, while the heat recovery heat exchanger 33 is in heating mode as the condenser of the dehumidifying heat exchanger 31. At this time, the exhaust fan 45 can directly blow the heat generated by the heat recovery heat exchanger 33 outdoors through the exhaust vent 24.

[0047] In the above embodiment, the supply air duct and the exhaust air duct 202 are isolated from each other, and the supply air duct and the exhaust air duct 202 are provided with heat-insulating materials to avoid interference between the indoor heat exchanger assembly and the heat recovery heat exchanger 33.

[0048] like Figures 1 to 5 As shown, in some embodiments, the indoor unit 11 further includes a pre-cooling heat exchanger 34. The pre-cooling heat exchanger 34 is disposed in the air inlet duct 201, and the pre-cooling heat exchanger 34 and the dehumidifying heat exchanger 31 are arranged sequentially along the air flow direction in the air inlet duct 201; wherein, the temperature of the pre-cooling heat exchanger 34 is higher than the temperature of the dehumidifying heat exchanger 31.

[0049] Specifically, the precooling heat exchanger 34 is located on the side of the dehumidifying heat exchanger 31 closest to the outside, that is, upstream of the airflow of the dehumidifying heat exchanger 31, so that the outdoor air flows through the precooling heat exchanger 34 and the dehumidifying heat exchanger 31 in sequence. The temperature of the precooling heat exchanger 34 is higher than the temperature of the dehumidifying heat exchanger 31. Thus, after the outdoor air flows into the air inlet duct 201, the precooling heat exchanger 34 precools the outdoor air to initially reduce its temperature and humidity. Then, the outdoor air flows to the dehumidifying heat exchanger 31, where it undergoes deep cooling and dehumidification.

[0050] Understandably, the pre-cooling followed by dehumidification staged dehumidification scheme has the following significant advantages, especially in high-temperature and high-humidity areas (such as the plum rain season in southern China): First, the pre-cooling heat exchanger 34 cools the high-temperature and high-humidity outdoor air to near the dew point temperature to remove sensible heat from the air, thereby avoiding over-cooling caused by a single low-temperature heat exchanger directly handling the high-temperature and high-humidity air, thus reducing the cooling power consumption of the dehumidification process; second, it can prevent the high-temperature and high-humidity air from directly contacting the low-temperature dehumidification heat exchanger 31, which would cause frost to form on the surface of the dehumidification heat exchanger 31; finally, it also optimizes the dehumidification process, making it easier to achieve the goal of deep dehumidification and reducing the need for reheating.

[0051] like Figure 1 As shown, in some embodiments, the indoor unit 11 further includes an electric heating device 41. The electric heating device 41 is disposed in the air inlet duct 201, and the electric heating device 41 is located on the side of the reheat heat exchanger 32 closer to the room.

[0052] Specifically, the electric heating device 41 is located on the side of the reheat heat exchanger 32 closest to the room, that is, downstream of the airflow between the dehumidification heat exchanger 31 and the reheat heat exchanger 32, so as to heat the low-temperature air processed by the dehumidification heat exchanger 31. With this arrangement, if the temperature of the reheat heat exchanger 32 is insufficient or the temperature of the dry air is low, the electric heating device 41 can quickly heat the dry air to avoid fluctuations in the indoor temperature.

[0053] like Figure 1 In some embodiments, the indoor unit 11 further includes a first temperature sensor and a control device. The first temperature sensor is used to obtain the first temperature of the air flowing into the room from the air inlet duct 201; the control device is electrically connected to the first temperature sensor and the electric heating device 41 respectively; when the first temperature is less than or equal to a preset temperature, the control device 41 is operated.

[0054] Specifically, a first temperature sensor is installed inside the air inlet duct 201, near the air outlet 22, to obtain the first temperature of the air at the air outlet 22 within the air inlet duct 201 in real time. The control device can control the operation and shutdown of the electric heating device 41 based on the first temperature, and control the operating temperature of the electric heating device 41. For example, if the first temperature is less than or equal to a preset temperature, the control device controls the electric heating device 41 to heat the air inside the air inlet duct 201; if the first temperature is greater than the preset temperature, the control device controls the electric heating device 41 to stop, to avoid excessively high temperatures in the air blown into the room. In practical applications, the preset temperature can be set according to the user's actual needs. For example, the preset temperature can be the same as the indoor temperature to avoid fluctuations in indoor temperature.

[0055] In some embodiments, when the difference between the preset temperature and the first temperature is greater than or equal to 6°C, the electric heating device 41 is controlled to operate at a first power; when the difference between the preset temperature and the first temperature is less than 6°C and greater than or equal to 4°C, the electric heating device 41 is controlled to operate at a second power; when the difference between the preset temperature and the first temperature is less than 4°C and greater than or equal to 2°C, the electric heating device 41 is controlled to operate at a third power; when the difference between the preset temperature and the first temperature is less than 2°C and greater than or equal to 0°C, the electric heating device 41 is controlled to operate at a fourth power; wherein the first power, second power, third power and fourth power decrease sequentially.

[0056] Specifically, when the difference between the preset temperature and the first temperature is greater than or equal to 6°C, it means that the temperature inside the air intake duct 201 is lower than the preset temperature and the temperature difference is large. Therefore, the electric heating device 41 is controlled to operate at its maximum power to quickly heat the dry air inside the air intake duct 201, bringing the dry air closer to the preset temperature. Similarly, when the difference between the preset temperature and the first temperature is less than 6°C and greater than or equal to 4°C, the electric heating device 41 is controlled to operate at a second power; when the difference is less than 4°C and greater than or equal to 2°C, the electric heating device 41 is controlled to operate at a third power; and when the difference is less than 2°C and greater than or equal to 0°C, the electric heating device 41 is controlled to operate at a fourth power. In this way, the power of the electric heating device 41 can be adjusted in real time according to the actual temperature difference. This setting not only avoids indoor temperature fluctuations but also achieves energy-saving effects.

[0057] In the above embodiments, the first power, the second power, the third power and the fourth power can be set according to the user's actual needs, as long as the first power, the second power, the third power and the fourth power decrease sequentially.

[0058] like Figure 1 As shown, in some embodiments, the indoor unit 11 further includes a humidifier 42 and a humidity sensor. The humidifier 42 is disposed in the air inlet duct 201 and is used to humidify the air around it; the humidity sensor is used to acquire the indoor humidity; wherein, the control device is also electrically connected to the humidifier 42 and the humidity sensor respectively; when the indoor humidity is less than or equal to the preset humidity, the control device 42 is operated.

[0059] Specifically, the humidification device 42 includes a wet film and a water supply device. The wet film assembly is arranged perpendicular to the air duct and located on the side of the air duct closer to the room. A humidity sensor is located on the side of the air inlet duct 201 closer to the room, the exhaust duct 202, or inside the room to obtain the indoor humidity. When the indoor humidity is low, the water supply device can be controlled to supply water to the wet film to increase the humidity of the air flowing through the wet film. In this way, the indoor humidity can be increased by blowing high-humidity air into the room. At the same time, the control device can also adjust the water supply amount of the water supply device to the wet film according to the indoor humidity, thereby regulating the air humidity.

[0060] like Figure 1 As shown, in some embodiments, the indoor unit 11 further includes a filter assembly 43. The filter assembly 43 is disposed at the air inlet 21 of the air inlet duct 201 and is used to filter outdoor air.

[0061] Specifically, the filter assembly 43 includes a high-efficiency particulate air (HEPA) filter, which is positioned perpendicular to the air inlet duct 201 at the air inlet 21. This allows outdoor air to be filtered by the HEPA filter as it flows into the air inlet duct 201. This arrangement improves indoor air quality.

[0062] like Figures 1 to 5 As shown, this disclosure also provides a fresh air conditioning system including: an outdoor unit 12 and the aforementioned indoor unit 11 for the fresh air conditioning system. The outdoor unit 12 is equipped with a compressor 46; the aforementioned indoor unit 11 for the fresh air conditioning system; wherein, the indoor heat exchanger assembly and the heat recovery heat exchanger 33 are respectively connected to the compressor 46.

[0063] Specifically, the outdoor unit 12 is equipped with a compressor 46, which is configured as a double-row, double-suction compressor 46. In this way, the precooling heat exchanger 34, the dehumidifying heat exchanger 31, the reheating heat exchanger 32, and the heat recovery heat exchanger 33 can be connected to the compressor 46 through refrigerant pipelines to form a refrigerant circulation loop, and a four-way valve is installed in the refrigerant circulation pipeline to control the operating status of the precooling heat exchanger 34, the dehumidifying heat exchanger 31, the reheating heat exchanger 32, and the heat recovery heat exchanger 33.

[0064] The fresh air conditioning system using the indoor unit 11 of the fresh air conditioning system provided in this application can recover indoor air waste heat through the heat recovery heat exchanger 33 by controlling the operating mode of the fresh air conditioning system, and configure the dehumidification heat exchanger 31 and the reheat heat exchanger 32 to low temperature and high temperature states respectively. With this setting, constant temperature dehumidification or heating dehumidification of the indoor air can be achieved without increasing the overall energy consumption of the fresh air conditioning system.

[0065] like Figures 1 to 5 As shown, in some embodiments, the compressor 46 includes a first exhaust port and a first intake port, the heat recovery heat exchanger 33 is connected to the first exhaust port through a first refrigerant pipeline 35, and the dehumidification heat exchanger 31 is connected to the first intake port through a first refrigerant pipeline 35.

[0066] Specifically, when the fresh air conditioning system is operating in dehumidification mode, the first exhaust port of the compressor 46 delivers high-temperature refrigerant to the heat recovery heat exchanger 33 via the first refrigerant pipe 35, configuring the heat recovery heat exchanger 33 as a condenser. Then, the low-temperature refrigerant flowing out of the heat recovery heat exchanger 33 flows into the dehumidification heat exchanger 31, configuring the dehumidification heat exchanger 31 as an evaporator. The refrigerant flowing out of the dehumidification heat exchanger 31 then flows to the first intake port of the compressor 46 to complete the refrigerant cycle. In this way, the air in the intake air duct 201 can be dehumidified through the dehumidification heat exchanger 31, and the heat from the heat recovery heat exchanger 33 can be discharged to the outside through the exhaust air duct 202.

[0067] like Figures 1 to 5As shown, in some embodiments, the compressor 46 further includes a second exhaust port and a second intake port. The reheat heat exchanger 32 and the precooling heat exchanger 34 are connected through a second refrigerant line 36. The reheat heat exchanger 32 is connected to the second exhaust port through the second refrigerant line 36, and the precooling heat exchanger 34 is connected to the second intake port through the second refrigerant line 36.

[0068] Specifically, when the fresh air conditioning system is operating in dehumidification mode, the second discharge port of the compressor 46 delivers high-temperature refrigerant to the reheat heat exchanger 32 via the second refrigerant pipeline 36, configuring the reheat heat exchanger 32 as a condenser. The low-temperature refrigerant flowing out of the reheat heat exchanger 32 then flows into the pre-cooling heat exchanger 34, configuring the pre-cooling heat exchanger 34 as an evaporator. The refrigerant flowing out of the pre-cooling heat exchanger 34 then flows to the second suction port of the compressor 46 to complete the refrigerant cycle. In this way, the dry air can be reheated through the reheat heat exchanger 32 to increase its temperature, and then the outdoor air can be pre-cooled through the pre-cooling heat exchanger 34.

[0069] The foregoing description and accompanying drawings fully illustrate embodiments of the present disclosure to enable those skilled in the art to practice them. Other embodiments may include structural and other changes. The embodiments represent only possible variations. Individual components and functions are optional unless explicitly required, and the order of operation may vary. Parts and features of some embodiments may be included or substituted for parts and features of other embodiments. Embodiments of the present disclosure are not limited to the structures described above and shown in the accompanying drawings, and various modifications and changes may be made without departing from its scope. The scope of the present disclosure is limited only by the appended claims.

Claims

1. An indoor unit for a fresh air conditioning system, characterized in that, include: The casing is provided with an air inlet duct and an air outlet duct, which are respectively connected to the indoor and outdoor environments; An indoor heat exchanger assembly includes a dehumidifying heat exchanger and a reheating heat exchanger, wherein the dehumidifying heat exchanger and the reheating heat exchanger are sequentially arranged within the air inlet duct along the airflow direction; and, A heat recovery heat exchanger is installed inside the exhaust duct, and the heat recovery heat exchanger is connected to the dehumidification heat exchanger through a first refrigerant pipeline; The airflow direction in the air intake duct is limited to from the outside to the inside, and the airflow direction in the air exhaust duct is limited to from the inside to the outside.

2. The indoor unit according to claim 1, characterized in that, Also includes: A precooling heat exchanger is installed inside the air inlet duct, and the precooling heat exchanger and the dehumidifying heat exchanger are arranged sequentially along the air flow direction inside the air inlet duct; The temperature of the precooling heat exchanger is higher than that of the dehumidifying heat exchanger.

3. The indoor unit according to claim 1, characterized in that, Also includes: An electric heating device is installed in the air inlet duct, and the electric heating device is located on the side of the reheat heat exchanger closer to the room.

4. The indoor unit according to claim 3, characterized in that, Also includes: The first temperature sensor is used to obtain the first temperature of the air flowing into the room through the air intake duct; and, The control device is electrically connected to the first temperature sensor and the electric heating device, respectively. When the first temperature is less than or equal to the preset temperature, the electric heating device is controlled to operate.

5. The indoor unit according to claim 4, characterized in that, When the difference between the preset temperature and the first temperature is greater than or equal to 6°C, the electric heating device is controlled to operate at the first power. When the difference between the preset temperature and the first temperature is less than 6°C and greater than or equal to 4°C, the electric heating device is controlled to operate at the second power. When the difference between the preset temperature and the first temperature is less than 4°C, and greater than or equal to 2°C, the electric heating device is controlled to operate at a third power; and, When the difference between the preset temperature and the first temperature is less than 2°C and greater than or equal to 0°C, the electric heating device is controlled to operate at the fourth power. Among them, the first power, the second power, the third power and the fourth power decrease in sequence.

6. The indoor unit according to claim 4, characterized in that, Also includes: A humidifying device is installed in the air inlet duct, and the humidifying device is used to humidify the air around it. and, A humidity sensor is used to obtain indoor humidity. The control device is also electrically connected to the humidification device and the humidity sensor, respectively. The humidifier will operate when the indoor humidity is less than or equal to the preset humidity.

7. The indoor unit according to any one of claims 1 to 6, characterized in that, Also includes: A filter assembly is installed at the air inlet of the air inlet duct and is used to filter outdoor air.

8. A fresh air conditioning system, characterized in that, include: The outdoor unit is equipped with a compressor; and, Indoor unit for a fresh air conditioning system as described in any one of claims 1 to 7; The indoor heat exchanger assembly and the heat recovery heat exchanger are respectively connected to the compressor.

9. The fresh air conditioning system according to claim 8, characterized in that, The compressor includes a first exhaust port and a first intake port. The heat recovery heat exchanger is connected to the first exhaust port through a first refrigerant pipeline, and the dehumidification heat exchanger is connected to the first intake port through a first refrigerant pipeline.

10. The fresh air conditioning system according to claim 9, characterized in that, The compressor further includes a second exhaust port and a second intake port. The reheat heat exchanger and the precooling heat exchanger are connected through a second refrigerant pipeline. The reheat heat exchanger is connected to the second exhaust port through the second refrigerant pipeline, and the precooling heat exchanger is connected to the second intake port through the second refrigerant pipeline.

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