Fresh air air conditioner unit and control method

Abstract

The present invention discloses a fresh air air conditioning unit and a control method. The fresh air air conditioning unit includes an indoor unit, an outdoor unit, an energy storage device, an air side main pipe, a liquid side main pipe, and a control valve group. The indoor unit includes a fresh air duct, an air supply duct, a dehumidification heat exchanger, and a temperature-regulating heat exchanger. The outdoor unit includes a compressor, a four-way valve, and an outdoor heat exchanger. The first end of the temperature-regulating heat exchanger is connected to the outdoor heat exchanger via the liquid side main pipe. The second end of the temperature-regulating heat exchanger is connected to the four-way valve via the air side main pipe. The energy storage device includes an accumulator. The first end of the accumulator is connected to the outdoor heat exchanger. The second end of the accumulator is connected to the first end of the dehumidification heat exchanger. The second end of the dehumidification heat exchanger is connected to the air intake port. In dehumidification mode, refrigerant enters the accumulator to condense and flows into the dehumidification heat exchanger to evaporate to dehumidify the fresh air. The humidity of the fresh air is processed without adding a new fresh air unit, reducing the workload of the compressor and improving economic efficiency.

Description

Technical Field

[0001] The present application relates to the technical field of air-conditioning equipment, and in particular to a fresh air air-conditioning unit and a control method. Background Art

[0002] Multi-split air conditioning systems have been widely used due to their flexible control, energy conservation, and low operating costs. Existing multi-split air conditioners often rely on additional fresh air units to process fresh air. This results in excessive heat and humidity loads on the indoor unit, high operating pressure on the outdoor unit's compressor, and difficulty in independently controlling the fresh air's temperature and humidity.

[0003] It should be noted that the statements in this background technology section only provide background technology related to the present invention and do not necessarily constitute prior art. Summary of the Invention

[0004] The present application provides a fresh air air conditioning unit and a control method to improve economic efficiency.

[0005] In a first aspect, the present application provides a fresh air air conditioning unit comprising an indoor unit, an outdoor unit, an energy storage device, an air manifold, a liquid manifold, and a control valve assembly. The indoor unit comprises a fresh air duct, an air supply duct, a dehumidification heat exchanger, and a temperature-regulating heat exchanger. The fresh air duct is used to introduce fresh air. The dehumidification heat exchanger is used to dehumidify the fresh air. The temperature-regulating heat exchanger is used to regulate the temperature of the fresh air. The air supply duct is used to discharge the treated fresh air into the room. The outdoor unit comprises a compressor, a four-way valve, and an outdoor heat exchanger. The compressor has an intake port and an exhaust port. The compressor exhaust port is connected to the first port of the four-way valve. The second port of the four-way valve is connected to the outdoor heat exchanger. The third port of the four-way valve is connected to the compressor intake port. The first end of the temperature-regulating heat exchanger is connected to the outdoor heat exchanger via the liquid manifold. The second end of the temperature-regulating heat exchanger is connected to the fourth port of the four-way valve via the air manifold. The energy storage device comprises an accumulator. The first end of the accumulator is connected to the outdoor heat exchanger. The second end of the accumulator is connected to the first end of the dehumidification heat exchanger. The second end of the dehumidification heat exchanger is connected to the air intake. The control valve assembly and the four-way valve work together to change the refrigerant flow path, enabling the fresh air air conditioning unit to switch between various operating modes. In dehumidification mode, refrigerant discharged from the compressor's exhaust port enters the accumulator through the first end, condenses there, and flows out of the second end. It then evaporates in the dehumidification heat exchanger to dehumidify the fresh air.

[0006] In some embodiments, the control valve assembly includes a first expansion valve connected to a first end of the dehumidification heat exchanger. The refrigerant flows out of the second end of the accumulator and enters the dehumidification heat exchanger for evaporation after being throttled by the first expansion valve.

[0007] In some embodiments, the temperature regulating heat exchanger includes a first heat exchanger disposed downstream of the dehumidification heat exchanger in the fresh air flow path. In dehumidification mode, the refrigerant enters the first heat exchanger through the fourth valve port of the four-way valve and exchanges heat with the fresh air to increase the temperature of the fresh air.

[0008] In some embodiments, the temperature-regulating heat exchanger includes a second heat exchanger disposed upstream of the dehumidification heat exchanger on the fresh air flow path. The second heat exchanger has a condensing state and an evaporating state to enable the fresh air air conditioning unit to switch between heating and cooling states.

[0009] In some embodiments, the energy storage device further includes a first pipeline. A first end of the accumulator is connected to the exhaust port via the first pipeline. The control valve assembly includes a first control valve disposed on the first pipeline, the first control valve being configured to control the on / off state of the first pipeline.

[0010] In some embodiments, the energy storage device further includes a second pipeline. The first end of the accumulator is connected to the liquid-side main pipe and the first pipeline via the second pipeline. The control valve assembly includes a second control valve disposed on the second pipeline. The second control valve is configured to control the on / off state of the second pipeline.

[0011] In some embodiments, the control valve assembly further includes a fifth control valve. The second pipeline is connected to the liquid side main pipe via the fifth control valve. The fifth control valve is used to connect or disconnect the second pipeline from the liquid side main pipe.

[0012] In some embodiments, the energy storage device further includes a third pipeline and a fourth pipeline. The first end of the accumulator is connected to the air intake port via the third pipeline. The second end of the accumulator is connected to the first pipeline via the fourth pipeline. The control valve assembly includes a third control valve disposed on the third pipeline and a fourth control valve disposed on the fourth pipeline. The third control valve is used to control the on / off state of the third pipeline. The fourth control valve is used to control the on / off state of the fourth pipeline.

[0013] In some embodiments, the energy storage device further includes a first pipeline, a second pipeline, a third pipeline, and a fourth pipeline. The temperature-regulating heat exchanger includes a first heat exchanger and a second heat exchanger. The first heat exchanger is arranged downstream of the dehumidification heat exchanger on the fresh air flow path. The second heat exchanger is arranged upstream of the dehumidification heat exchanger on the fresh air flow path. The first end of the accumulator is connected to the exhaust port through the first pipeline, is connected to the liquid side main pipe and the first pipeline through the second pipeline, and is connected to the exhaust port through the third pipeline. The second end of the accumulator is connected to the first pipeline through the fourth pipeline. The first end of the first heat exchanger and the first end of the second heat exchanger are both connected to one end of the outdoor heat exchanger through the liquid side main pipe. The second ends of the first heat exchanger and the second heat exchanger are both connected to the fourth valve port of the four-way valve through the gas side main pipe. The control valve group includes a first control valve arranged on the first pipeline for controlling the on-off of the first pipeline, a second control valve arranged on the second pipeline for controlling the on-off of the second pipeline, a third control valve arranged on the third pipeline for controlling the on-off of the third pipeline, a fourth control valve arranged on the fourth pipeline for controlling the on-off of the fourth pipeline, and a fifth control valve for connecting or disconnecting the second pipeline and the liquid side main pipe.

[0014] In some embodiments, the outdoor unit further includes a gas-liquid separator. The gas-liquid separator is connected to the air intake. The gas-liquid separator is configured to separate the refrigerant into gas and liquid. When the refrigerant flows toward the air intake, it is first processed by the gas-liquid separator before returning to the air intake.

[0015] In some embodiments, the indoor unit further includes an exhaust duct and a heat exchanger. The heat exchanger is disposed at the entrance of the fresh air duct. The exhaust duct is connected to the heat exchanger so that the fresh air first exchanges heat with the exhaust air in the heat exchanger before entering the supply air duct.

[0016] The second aspect of the present application provides a control method based on the above-mentioned fresh air air-conditioning unit, including the following steps: obtaining the temperature and humidity of the indoor air and the temperature and humidity of the outdoor air; obtaining a control strategy based on the temperature and humidity of the indoor air and the temperature and humidity of the outdoor air; and adjusting the states of the dehumidification heat exchanger, the temperature regulating heat exchanger and the accumulator according to the control strategy to enable the fresh air air-conditioning unit to switch between multiple working modes.

[0017] In some embodiments, the control strategy includes entering a dehumidification mode when the temperature of the indoor and outdoor air is within a set range and the humidity of the indoor air is higher than the dehumidification set value. In the dehumidification mode, the refrigerant is discharged from the exhaust port and flows into the first end of the accumulator for condensation and flows out from the second end of the accumulator, and evaporates in the dehumidification heat exchanger to dehumidify the fresh air.

[0018] The third aspect of the present application provides a control method for the above-mentioned fresh air air-conditioning unit, comprising the following steps: obtaining the temperature and humidity of the indoor air and the temperature and humidity of the outdoor air; obtaining a control strategy based on the temperature and humidity of the indoor air and the temperature and humidity of the outdoor air; and adjusting the states of the dehumidification heat exchanger, the temperature regulating heat exchanger and the accumulator according to the control strategy to enable the fresh air air-conditioning unit to switch between multiple working modes.

[0019] In some embodiments, the operating modes of the fresh air air conditioning unit include cooling mode, dehumidification mode, cooling and dehumidification mode, heating mode, heat release mode, defrost mode, heat release and defrost mode, and ventilation mode.

[0020] In some embodiments, the control strategy includes entering the cooling mode when the indoor temperature is higher than the cooling set value and the indoor humidity is lower than the dehumidification set value. In the cooling mode, the fifth control valve and the first pipeline are disconnected and the four-way valve is actuated. After the refrigerant is discharged from the exhaust port, it passes through the four-way valve, the outdoor heat exchanger and the liquid side main pipe to the first end of the second heat exchanger, and then flows back to the intake port through the gas side main pipe and the four-way valve. The refrigerant evaporates in the second heat exchanger to cool the fresh air.

[0021] In some embodiments, the control strategy includes entering a dehumidification mode when the indoor and outdoor temperatures are within a set range and the indoor humidity is higher than a dehumidification set value. In the dehumidification mode, the first pipeline and the second pipeline are connected, the third pipeline, the fourth pipeline and the fifth control valve are disconnected, and the four-way valve is actuated. After the refrigerant is discharged from the exhaust port, it is divided into two paths. One path flows to the first end of the accumulator through the first pipeline, and after condensation treatment by the accumulator, it flows from the second end of the accumulator to the first end of the dehumidification heat exchanger, and then flows back to the air intake from the dehumidification heat exchanger. The other path flows to the second end of the first heat exchanger through the four-way valve and the gas side main pipe, and then flows back to the air intake through the liquid side main pipe, the outdoor heat exchanger and the four-way valve. One path of the refrigerant evaporates in the dehumidification heat exchanger, and the other path of the refrigerant condenses in the first heat exchanger. The temperature of the fresh air is first reduced to below the set temperature and then increased to the set range for dehumidification.

[0022] In some embodiments, the control strategy includes entering the cooling and dehumidification mode when the indoor and outdoor temperatures are both higher than the cooling set value and the indoor and outdoor humidity are both higher than the dehumidification set value. In the cooling and dehumidification mode, the second pipeline and the fifth control valve are connected, the first pipeline, the third pipeline and the fourth pipeline are disconnected, and the four-way valve is actuated. After the refrigerant is discharged from the exhaust port, it passes through the four-way valve and the outdoor heat exchanger and is divided into two paths. One path flows to the first end of the accumulator through the second pipeline, and after being overcooled by the accumulator, it flows from the second end of the accumulator to the first end of the dehumidification heat exchanger, and then flows back to the air intake from the dehumidification heat exchanger. The other path flows to the first end of the second heat exchanger through the liquid side main pipe, and then flows back to the air intake through the gas side main pipe and the four-way valve. The second heat exchanger and the dehumidification heat exchanger are both used to evaporate the refrigerant so that the temperature and humidity of the fresh air reach the set values.

[0023] In some embodiments, the control strategy includes heating the room when the indoor temperature is lower than the heating set value, wherein, when the internal temperature of the accumulator is greater than or equal to the first threshold, the heat release mode is entered. In the heat release mode, the first pipeline and the second pipeline are disconnected, the third pipeline, the fourth pipeline and the fifth control valve are connected, and the four-way valve is actuated. After the refrigerant is discharged from the exhaust port, it flows through the four-way valve and the gas side main pipe to the second end of the second heat exchanger, and then flows through the liquid side main pipe and the fourth pipeline to the second end of the accumulator. The refrigerant absorbs the accumulator. The energy of the accumulator is evaporated and then discharged from the first end of the accumulator and returned to the air intake through the third pipeline. The refrigerant is condensed in the second heat exchanger to heat the fresh air. When the internal temperature of the accumulator is lower than the first threshold value, the heating mode is entered. In the heating mode, the fifth control valve is disconnected and the four-way valve is actuated. After being discharged from the exhaust port, the refrigerant flows through the four-way valve and the gas side main pipe to the second end of the second heat exchanger, and then passes through the liquid side main pipe, the outdoor heat exchanger and the four-way valve to return to the air intake. The refrigerant condenses in the second heat exchanger to heat the fresh air.

[0024] In some embodiments, the control strategy includes defrosting the outdoor unit when the temperature of the heat exchange tube of the outdoor heat exchanger is lower than the first defrost setting value and the heating time of the outdoor heat exchanger is greater than the second defrost setting value, wherein the defrost mode is entered when the temperature in the accumulator is lower than the second threshold value. In the defrost mode, the fifth control valve and the first pipeline are disconnected and the four-way valve is actuated. After the refrigerant is discharged from the exhaust port, it flows through the four-way valve, the outdoor heat exchanger and the liquid side main pipe to the first end of the second heat exchanger, and then flows back to the suction port through the gas side main pipe and the four-way valve. The refrigerant condenses in the outdoor heat exchanger and is discharged in the second heat exchanger. The heat exchanger evaporates, causing the environment near the outdoor heat exchanger to heat up for defrosting; when the temperature in the accumulator is greater than or equal to the second threshold value, the heat release defrost mode is entered. In the heat release defrost mode, the first pipeline and the second pipeline are disconnected, the fifth control valve, the third pipeline and the fourth pipeline are connected, and the four-way valve is actuated. After being discharged from the exhaust port, the refrigerant flows into the second end of the accumulator through the four-way valve, the outdoor heat exchanger and the fourth pipeline. The refrigerant absorbs the energy of the accumulator and evaporates, and then flows back to the air intake port through the third pipeline. The refrigerant condenses in the outdoor heat exchanger, causing the environment near the outdoor heat exchanger to heat up for defrosting.

[0025] In some embodiments, adjusting the state of the energy accumulator includes: causing the energy accumulator to store energy during a period when the electricity price of the power supply system is low; and causing the energy accumulator to release energy during a period when the electricity price of the power supply system is high.

[0026] Based on the technical solution provided by the present invention, a fresh air air conditioning unit includes an indoor unit, an outdoor unit, an energy storage device, an air-side main pipe, a liquid-side main pipe, and a control valve assembly. The indoor unit includes a fresh air duct, an air supply duct, a dehumidification heat exchanger, and a temperature-regulating heat exchanger. The fresh air duct is used to introduce fresh air. The dehumidification heat exchanger is used to dehumidify the fresh air. The temperature-regulating heat exchanger is used to regulate the temperature of the fresh air. The air supply duct is used to discharge the treated fresh air into the room. The outdoor unit includes a compressor, a four-way valve, and an outdoor heat exchanger. The compressor has an intake and an exhaust port. The compressor's exhaust port is connected to the first port of the four-way valve. The second port of the four-way valve is connected to the outdoor heat exchanger. The third port of the four-way valve is connected to the compressor's intake port. The first end of the temperature-regulating heat exchanger is connected to the outdoor heat exchanger via the liquid-side main pipe. The second end of the temperature-regulating heat exchanger is connected to the fourth port of the four-way valve via the air-side main pipe. The energy storage device includes an accumulator. The first end of the accumulator is connected to the outdoor heat exchanger. The second end of the accumulator is connected to the first end of the dehumidification heat exchanger. The second end of the dehumidification heat exchanger is connected to the air intake. The control valve assembly and the four-way valve work together to change the refrigerant flow path, allowing the fresh air air conditioning unit to switch between various operating modes. In dehumidification mode, refrigerant discharged from the compressor's exhaust port enters the accumulator through the first end, condenses, and flows out through the second end. It evaporates in the dehumidification heat exchanger to dehumidify the fresh air. By installing a dehumidification heat exchanger in the air supply duct, the fresh air air conditioning unit can use the indoor unit to adjust the humidity of the fresh air, without adding a new fresh air unit, to maintain a comfortable indoor humidity range. This reduces the workload of the compressor, lowers costs, and improves economic efficiency. Furthermore, during the dehumidification process, the refrigerant passes through the accumulator, allowing it to fully absorb the refrigerant's energy. This conveniently increases the wet load capacity of the fresh air air conditioning unit without changing the capacity of the indoor unit.

[0027] Further features and advantages of the present invention will become apparent from the following detailed description of exemplary embodiments of the present invention with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0029] Figure 1 This is a structural diagram of the fresh air air conditioning unit of an embodiment of the present application.

[0030] Figure 2 for Figure 1 Schematic diagram of the fresh air air conditioning unit in ventilation mode.

[0031] Figure 3 for Figure 1Schematic diagram of the refrigerant flow path when the fresh air air conditioning unit is in cooling mode.

[0032] Figure 4 for Figure 1 Schematic diagram of the refrigerant flow path when the fresh air air conditioning unit is in heating mode.

[0033] Figure 5 for Figure 1 Schematic diagram of the refrigerant flow path when the fresh air air conditioning unit is in dehumidification mode.

[0034] Figure 6 for Figure 1 Schematic diagram of the refrigerant flow path when the fresh air air conditioning unit is in cooling and dehumidification mode.

[0035] Figure 7 for Figure 1 Schematic diagram of the refrigerant flow path when the fresh air air conditioning unit is in heat release mode.

[0036] Figure 8 for Figure 1 Schematic diagram of the refrigerant flow path when the fresh air air conditioning unit is in defrost mode.

[0037] Figure 9 for Figure 1 Schematic diagram of the refrigerant flow path when the fresh air air conditioning unit is in heat release defrost mode. DETAILED DESCRIPTION

[0038] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is in no way intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0039] Unless otherwise specifically stated, the relative arrangement of the parts and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to actual proportional relationships. Technology, methods and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but in appropriate cases, technology, methods and equipment should be considered as part of the specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar numbers and letters represent similar items in the following drawings, and therefore, once an item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0040] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used herein to describe the spatial positional relationship of a device or feature to other devices or features as shown in the figures. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figures. For example, if the device in the drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be subsequently positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device may also be positioned in other different ways, and the spatially relative descriptions used herein are interpreted accordingly.

[0041] refer to Figure 1The present application provides a fresh air air conditioning unit, comprising an indoor unit 3, an outdoor unit 1, an energy storage device 2, an air side main pipe 5, a liquid side main pipe 4, and a control valve group. The indoor unit 3 comprises a fresh air duct 31, an air supply duct 32, a dehumidification heat exchanger 304, and a temperature control heat exchanger. The fresh air duct 31 is used to introduce fresh air. The dehumidification heat exchanger 304 is used to dehumidify the fresh air. The temperature control heat exchanger is used to adjust the temperature of the fresh air. The air supply duct 32 is used to discharge the treated fresh air into the room. The outdoor unit 1 comprises a compressor 101, a four-way valve 102, and an outdoor heat exchanger 103. The compressor 101 has an air intake and an air exhaust. The exhaust port of the compressor 101 is connected to the first valve port of the four-way valve 102. The second valve port of the four-way valve 102 is connected to the outdoor heat exchanger 103. The third valve port of the four-way valve 102 is connected to the air intake of the compressor 101. The first end of the temperature-regulating heat exchanger is connected to the outdoor heat exchanger 103 via the liquid-side main pipe 4. The second end of the temperature-regulating heat exchanger is connected to the fourth valve port of the four-way valve 102 via the gas-side main pipe 5. The energy storage device 2 includes an accumulator 201. The first end of the accumulator 201 is connected to the outdoor heat exchanger 103. The second end of the accumulator 201 is connected to the first end of the dehumidification heat exchanger 304. The second end of the dehumidification heat exchanger 304 is connected to the air intake. The control valve group and the four-way valve 102 work together to change the flow path of the refrigerant so that the fresh air air conditioning unit can switch between multiple operating modes. In the dehumidification mode, the refrigerant discharged from the exhaust port of the compressor 101 enters the accumulator 201 from the first end to condense, flows out from the second end of the accumulator 201, and evaporates in the dehumidification heat exchanger 304 to dehumidify the fresh air. By installing a dehumidification heat exchanger 304 in the air supply duct 32, the fresh air air conditioning unit can utilize the indoor unit 3 to adjust the humidity of the fresh air without adding a new fresh air unit, keeping the indoor humidity within a comfortable range. This reduces the workload of the compressor, lowers costs, and improves economic efficiency. Furthermore, during the dehumidification process, the refrigerant passes through the accumulator 201, allowing it to fully absorb the energy in the refrigerant. This conveniently increases the wet load capacity of the fresh air air conditioning unit without changing the capacity of the indoor unit.

[0042] Specifically, the accumulator 201 is filled with energy storage material and is provided with a refrigerant pipeline. The refrigerant flows in the pipeline and fully exchanges heat with the energy storage material to achieve energy storage or release. During the dehumidification process, the gaseous refrigerant is discharged from the exhaust port and passes through the accumulator 201. The accumulator 201 absorbs the energy in the refrigerant to cool the refrigerant and turn it into a liquid state. The liquid refrigerant then absorbs the energy of the fresh air in the dehumidification heat exchanger, reducing the fresh air temperature to a set value (e.g., dew point temperature), thereby removing moisture from the fresh air and achieving dehumidification.

[0043] refer to Figure 1In some embodiments, the control valve assembly includes a first expansion valve 305 connected to the first end of the dehumidification heat exchanger 304. The refrigerant flows out of the second end of the accumulator 201 and enters the dehumidification heat exchanger 304 after being throttled by the first expansion valve 305 to evaporate. The first expansion valve 305 acts as a throttling element, and its valve opening is adjustable, thereby changing the flow rate of the refrigerant flowing into the dehumidification heat exchanger 304 and adjusting the dehumidification effect. For example, increasing the opening of the first expansion valve 305 increases the flow rate of the refrigerant flowing into the first expansion valve 305, lowering the temperature of the fresh air and enhancing the dehumidification effect. Conversely, decreasing the opening of the first expansion valve 305 weakens the dehumidification effect.

[0044] refer to Figure 1 In some embodiments, the temperature-regulating heat exchanger includes a first heat exchanger 306 disposed downstream of the dehumidification heat exchanger 304 in the fresh air flow path. In dehumidification mode, the refrigerant enters the first heat exchanger 306 through the fourth valve port of the four-way valve 102 and exchanges heat with the fresh air to increase the temperature of the fresh air. Specifically, the fresh air passes through the dehumidification heat exchanger 304 and the first heat exchanger 306 along its flow path. The dehumidification heat exchanger 304 lowers the temperature of the fresh air to remove moisture from the air, and the first heat exchanger then raises the temperature of the fresh air. Ultimately, only moisture is removed from the fresh air without changing its temperature, thereby maintaining a dry indoor environment without affecting the indoor temperature.

[0045] refer to Figure 1 In some embodiments, the control valve assembly includes a second expansion valve 307 connected to the first end of the first heat exchanger 306. By adjusting the valve opening of the second expansion valve 307, the flow rate of the refrigerant flowing into the first heat exchanger 306 is changed, thereby changing the refrigerant's heating effect on the fresh air. This allows the fresh air air conditioning unit to achieve more functions. For example, after cooling and dehumidifying, the fresh air temperature can be raised to a temperature higher than the indoor temperature to dry the room while also heating the room.

[0046] refer to Figure 1 In some embodiments, the temperature-regulating heat exchanger includes a second heat exchanger 302 disposed upstream of the dehumidification heat exchanger 304 in the fresh air flow path. The second heat exchanger 302 has a condensing state and an evaporating state, enabling the fresh air air conditioning unit to switch between heating and cooling modes. Specifically, the fresh air passes through the second heat exchanger 302 and the dehumidification heat exchanger 304 in sequence along its flow path. The operating state of the second heat exchanger 302 is changed so that it cooperates with the dehumidification heat exchanger 304 to achieve simultaneous dehumidification and cooling. Of course, it is also possible to change the operating state of only the second heat exchanger 302 without activating the dehumidification heat exchanger, allowing the fresh air air conditioning unit to perform cooling or heating.

[0047] refer to Figure 1In some embodiments, the control valve assembly includes a third expansion valve 303 connected to the first end of the second heat exchanger 302. By adjusting the valve opening of the third expansion valve 303, the flow rate of the refrigerant flowing into the second heat exchanger 302 is changed, thereby changing the temperature control effect of the refrigerant on the fresh air.

[0048] refer to Figure 1 In some embodiments, the energy storage device 2 further includes a first pipeline 209. The first end of the accumulator 201 is connected to the exhaust port through the first pipeline 209. The control valve group includes a first control valve 208 provided on the first pipeline 209. The first control valve 208 is used to control the on-off of the first pipeline 209. Specifically, the high-temperature and high-pressure refrigerant discharged from the exhaust port can directly enter the accumulator 201 through the on-off first pipeline 209 to store energy in the accumulator 201. Furthermore, the refrigerant can be diverted during the dehumidification process, thereby achieving the above-mentioned function of only dehumidifying without changing the fresh air temperature.

[0049] In some embodiments, the first control valve 208 is a high-pressure gas valve, the valve core opening of which is adjustable to change the flow rate of the refrigerant flowing to the accumulator 201 .

[0050] refer to Figure 1 In some embodiments, the energy storage device 2 further includes a second pipeline 206. The first end of the accumulator 201 is connected to the liquid side main pipe 4 and the first pipeline 209 through the second pipeline 206. The control valve group includes a second control valve 205 provided on the second pipeline 206, and the second control valve 205 is used to control the on-off of the second pipeline 206. Through the second pipeline 206, the refrigerant in the liquid side main pipe 4 can flow to the accumulator 201. Furthermore, the refrigerant can be diverted and flow to the accumulator 201 and the second heat exchanger 302 respectively, so that the second heat exchanger 302 and the dehumidification heat exchanger 304 cooperate to process the temperature and humidity of the fresh air.

[0051] refer to Figure 1 In some embodiments, the control valve assembly further includes a fifth control valve 207. The second pipeline 206 is connected to the liquid side main pipe 4 via the fifth control valve 207. The fifth control valve 207 is used to connect or disconnect the second pipeline 206 from the liquid side main pipe 4.

[0052] In some embodiments, the fifth control valve 207 includes a one-way valve through which the refrigerant can flow into the first end of the accumulator 201 but cannot flow out of the first end of the accumulator 201 and into the liquid-side main pipe 4 through the one-way valve.

[0053] refer to Figure 1 In some embodiments, the control valve group further includes a bypass valve 204. The bypass valve 204 is provided on the liquid side main pipe 4 and is used to control the on-off of the liquid side main pipe 4.

[0054] In some embodiments, the energy storage device 2 further includes a third pipeline 203 and a fourth pipeline 210. The first end of the accumulator 201 is connected to the air intake port via the third pipeline 203. The second end of the accumulator 201 is connected to the first pipeline 209 via the fourth pipeline 210. The control valve assembly includes a third control valve 202 disposed on the third pipeline 203 and a fourth control valve 211 disposed on the fourth pipeline 210. The third control valve 202 is used to control the on / off state of the third pipeline 203. The fourth control valve 211 is used to control the on / off state of the fourth pipeline 210. This allows the refrigerant to flow into and out of the second end of the accumulator 201, then flow back to the air intake port through the third pipeline 203, thereby achieving heat exchange between the accumulator 201 and the refrigerant. For example, after the liquid refrigerant enters the accumulator and absorbs energy and evaporates, it can then flow back to the air intake port through the third pipeline 203, thereby releasing energy from the accumulator 201. The fourth pipeline 210 allows the gaseous refrigerant to flow directly into the second end of the accumulator 201 after condensing at the temperature-regulating heat exchanger, absorb the heat of the accumulator 201 and evaporate without being processed by the outdoor heat exchanger 103, thereby reducing the workload of the outdoor unit.

[0055] refer to Figure 1 In some embodiments, the control valve group further includes a heating electronic expansion valve 104. The heating electronic expansion valve 104 is connected between the outdoor heat exchanger 103 and the liquid side main pipe 4.

[0056] refer to Figure 1 In some embodiments, the control valve assembly further includes a sixth control valve 212. The sixth control valve 212 is connected between the second end of the accumulator 201 and the first end of the dehumidification heat exchanger 304. The sixth control valve 212 is used to control the flow of the pipeline between the accumulator and the dehumidification heat exchanger. Specifically, the sixth control valve 212 can be a one-way valve configured to allow one-way flow from the second end of the accumulator 201 to the first end of the dehumidification heat exchanger 304.

[0057] refer to Figure 1 In some embodiments, the energy storage device 2 further includes a fifth pipeline 214. The second end of the accumulator 201 is connected to the liquid-side main pipe 4 via the fifth pipeline 214. The control valve assembly further includes a seventh control valve 213. The seventh control valve 213 is used to control the on / off state of the fifth pipeline 214. Specifically, the seventh control valve 213 may be a thermal storage valve.

[0058] refer to Figure 1In some embodiments, the fresh air air conditioning unit further includes a detection device. Specifically, the detection device includes a first temperature detection device 401 for detecting outdoor temperature, a first humidity detection device 402 for detecting outdoor humidity, a second temperature detection device 309 for detecting supply air temperature, a second humidity detection device 310 for detecting supply air humidity, a third temperature detection device 501 for detecting indoor temperature, and a third humidity detection device 502 for detecting indoor humidity. Specifically, the temperature detection device may be an electronic temperature sensor. The humidity detection device may be an electronic humidity sensor.

[0059] In some embodiments, the fresh air air conditioning unit further includes a controller, which is signal-connected to the four-way valve 102, the control valve assembly, the electronic temperature sensor, and the electronic humidity sensor. Based on the detection values of the electronic temperature sensor and the electronic humidity sensor, the controller controls the four-way valve 102 and the control valve assembly to perform different actions, thereby providing multiple refrigerant flow paths and enabling the fresh air air conditioning unit to achieve different functions.

[0060] refer to Figure 1In some embodiments, the energy storage device 2 further includes a first pipeline 209, a second pipeline 206, a third pipeline 203, and a fourth pipeline 210. The temperature-regulating heat exchanger includes a first heat exchanger 306 and a second heat exchanger 302. The first heat exchanger 306 is located downstream of the dehumidification heat exchanger 304 in the fresh air flow path. The second heat exchanger 302 is located upstream of the dehumidification heat exchanger 304 in the fresh air flow path. The first end of the energy storage device 201 is connected to the exhaust port via the first pipeline 209, to the liquid-side main pipe 4 and the first pipeline 209 via the second pipeline 206, and to the exhaust port via the third pipeline 203. The second end of the energy storage device 201 is connected to the first pipeline 209 via the fourth pipeline 210. The first end of the first heat exchanger 306 and the first end of the second heat exchanger 302 are both connected to one end of the outdoor heat exchanger 103 via the liquid-side main pipe 4. The second ends of the first heat exchanger 306 and the second heat exchanger 302 are both connected to the fourth valve port of the four-way valve 102 via the gas-side manifold 5. The control valve group includes a first control valve 208 provided on the first pipeline 209 for controlling the on / off of the first pipeline 209, a second control valve 205 provided on the second pipeline 206 for controlling the on / off of the second pipeline 206, a third control valve 202 provided on the third pipeline 203 for controlling the on / off of the third pipeline 203, a fourth control valve 211 provided on the fourth pipeline 210 for controlling the on / off of the fourth pipeline 210, and a fifth control valve 207 for connecting or disconnecting the second pipeline 206 and the liquid-side manifold 4. In this embodiment, the indoor unit has three heat exchangers. By controlling the on-off of the first pipeline 209, the second pipeline 206, the third pipeline 203 and the fourth pipeline 210 and the on-off of the fifth control valve 207, and coordinating the action of the four-way valve 102, the refrigerant can have a variety of circulation modes, thereby enabling the fresh air air-conditioning unit to have multiple working modes and thus realize multiple functions.

[0061] refer to Figure 1 In some embodiments, the outdoor unit 1 further includes a gas-liquid separator 105 . The gas-liquid separator 105 is connected to the air intake. The gas-liquid separator 105 is used to separate the refrigerant into gas and liquid. When the refrigerant flows to the air intake, it is first processed by the gas-liquid separator 105 before returning to the air intake.

[0062] refer to Figure 1In some embodiments, the indoor unit 3 further includes an exhaust duct 33 and a heat exchanger 301. The heat exchanger 301 is located at the entrance of the fresh air duct 31. The exhaust duct 33 is connected to the heat exchanger 301 so that the fresh air first exchanges heat with the air discharged from the exhaust duct 33 in the heat exchanger 301 before entering the supply air duct 32. Before entering the supply air duct 32, the fresh air first exchanges heat with the air discharged from the exhaust duct 33, fully utilizing the energy of the indoor exhaust air and further improving economic performance. For example, during heating, the heat in the exhaust air discharged from the room exchanges heat with the low-temperature fresh air to preheat the fresh air, which is then processed by the heat exchanger to be adjusted to the desired temperature. During cooling, the heat in the exhaust air discharged from the room exchanges heat with the higher-temperature fresh air to precool the fresh air, which is then processed by the heat exchanger to be reduced to the desired temperature.

[0063] The present application also provides a control method based on the above-mentioned fresh air air conditioning unit, comprising the following steps:

[0064] Obtaining the temperature and humidity of indoor air and the temperature and humidity of outdoor air;

[0065] deriving a control strategy based on the temperature and humidity of the indoor air and the temperature and humidity of the outdoor air; and

[0066] The states of the dehumidification heat exchanger 304, the temperature regulating heat exchanger and the accumulator 201 are adjusted according to the control strategy to enable the fresh air air conditioning unit to switch between multiple working modes.

[0067] In some embodiments, the operating modes of the fresh air air conditioning unit include cooling mode, dehumidification mode, cooling and dehumidification mode, heating mode, heat release mode, defrost mode, heat release and defrost mode, and ventilation mode.

[0068] refer to Figure 3 In some embodiments, the control strategy includes entering a cooling mode when the indoor air temperature is higher than a cooling set value and the indoor humidity is lower than a dehumidification set value. In the cooling mode, the fifth control valve 207 and the first pipeline 209 are disconnected and the four-way valve 102 is actuated. After the refrigerant is discharged from the exhaust port, it flows through the four-way valve 102, the outdoor heat exchanger 103, and the liquid side main pipe 4 to the first end of the second heat exchanger 302, and then flows back to the air intake port through the gas side main pipe 5 and the four-way valve 102. The refrigerant evaporates in the second heat exchanger 302 to cool the fresh air.

[0069] Specifically, during the cooling season, the temperature and humidity detection device can be used to obtain the indoor and outdoor temperature and humidity at a set detection frequency (for example, once every 5 minutes). For example, the lower limit of the temperature comfort zone is set to 20°C, the upper limit is set to 25°C, and the dehumidification setting value is 50%. The cooling setting value is the upper limit of the temperature comfort zone. When the indoor and outdoor temperatures are both higher than 25°C and the indoor and outdoor humidity is lower than 50%, the cooling mode is entered, the first valve port and the second valve port of the four-way valve 102 are connected, and the third valve port and the fourth valve port are connected. The gaseous refrigerant enters the outdoor heat exchanger 103 through the exhaust port, the first valve port, and the second valve port and condenses. Then, it enters the second heat exchanger 302 through the liquid side main pipe 5 and the first end of the second heat exchanger 302. The low-temperature refrigerant absorbs the heat in the fresh air and evaporates to reduce the fresh air temperature. Then, it returns to the air intake through the second end of the second heat exchanger 302, the gas side main pipe 5, the fourth valve port, the third valve port, and the gas-liquid separator 105.

[0070] During this process, the flow rate of the refrigerant is continuously adjusted according to the measured values of the second temperature detection device 309 and the third temperature detection device 501, so as to adjust the cooling effect of the second heat exchanger 302 in real time and make the supply air temperature satisfy the following relationship:

[0071] <![CDATA[T 内 ]]> <![CDATA[(T 上 ,T 上 +A1]]]> <![CDATA[(T 上 +A1,T 上 +A2]]]> … <![CDATA[(T 上 +A n-1 ,T 上 +A n ]]]> <![CDATA[>T 上 +A n ]]> <![CDATA[T 送 ]]> <![CDATA[T 上 -B0]]> <![CDATA[T 上 -B1]]> … <![CDATA[T 上 -B n-1 ]]> <![CDATA[T 上 -B n ]]>

[0072] Among them, T 内 is the indoor temperature, T 送 is the supply air temperature, T 上 is the upper limit of the temperature comfort range, A and B are parameters, and 0 <A1≤…≤A n , 0 <B0≤B1≤…≤B n That is, the more the indoor temperature exceeds the upper limit of the temperature comfort zone, the lower the supply air temperature is made to quickly reduce the indoor temperature to within the temperature comfort zone.

[0073] refer to Figure 5In some embodiments, the control strategy includes entering a dehumidification mode when the indoor and outdoor temperatures are within a set range and the indoor humidity is higher than a dehumidification set value. In the dehumidification mode, the first pipeline 209 and the second pipeline 206 are connected, the third pipeline 203, the fourth pipeline 210 and the fifth control valve 207 are disconnected, and the four-way valve 102 is actuated. After the refrigerant is discharged from the exhaust port, it is divided into two paths. One path flows through the first pipeline 209 to the first end of the accumulator 201, and after being condensed by the accumulator 201, it is discharged from the accumulator 201. The second end of the energy device 201 flows to the first end of the dehumidification heat exchanger 304, and then flows back to the air intake from the dehumidification heat exchanger 304. The other path flows to the second end of the first heat exchanger 306 through the four-way valve 102 and the gas side main pipe 5, and then flows back to the air intake through the liquid side main pipe 4, the outdoor heat exchanger 103 and the four-way valve 102. One path of refrigerant evaporates in the dehumidification heat exchanger 304, and the other path of refrigerant condenses in the first heat exchanger 306. The temperature of the fresh air is first reduced to below the set temperature and then increased to the set range for dehumidification.

[0074] Specifically, the dehumidification setting value can be 50%. When the indoor and outdoor temperatures are both between 20 and 25°C and the indoor humidity is greater than 50%, the dehumidification mode is entered, and the first valve port and the fourth valve port of the four-way valve 102 are controlled to be connected, and the second valve port and the third valve port are controlled to be connected. The high-temperature gaseous refrigerant enters the accumulator 201 through the first pipeline 209 and the first end of the accumulator 201. The accumulator 201 absorbs energy to liquefy the refrigerant, and then the low-temperature liquid refrigerant enters the dehumidification heat exchanger 304 through the first end of the dehumidification heat exchanger 304. The low-temperature refrigerant absorbs heat in the fresh air to reduce the fresh air temperature to below the dew point temperature (the specific value can be set according to needs) and evaporates and then passes through the gas-liquid separator 105. It flows back to the air intake. Since the first refrigerant will lower the temperature of the fresh air to a very low level, when the humidity of the fresh air meets the requirements, the temperature of the fresh air will be lower than the lower limit of the temperature comfort range. Therefore, the second heat exchanger 306 is required to increase the temperature of the fresh air. That is, the other refrigerant enters the first heat exchanger 306 through the first valve port, the fourth valve port, the gas side main pipe 5 and the second end of the first heat exchanger 306. The low-temperature fresh air absorbs the energy of the high-temperature refrigerant and heats up. After the refrigerant condenses into liquid refrigerant, it flows into the outdoor heat exchanger 103 through the first end of the first heat exchanger 306 and the liquid side main pipe 4 and evaporates into gaseous refrigerant in the outdoor heat exchanger 103, and then passes through the second valve port, the third valve port and the gas-liquid separator 105 and returns to the air intake.

[0075] During this process, the flow rates of the two refrigerants are continuously adjusted to adjust the dehumidification effect of the dehumidification heat exchanger 304 in real time and to make the supply air humidity satisfy the following relationship:

[0076]

[0077]

[0078] Among them, H内 is the indoor temperature, H 送 is the supply air humidity, H 上 is the humidity setting value, C and D are parameters, and 0 <C1≤…≤C n , 0 <D0≤D1≤…≤D n That is, the more the indoor humidity exceeds the humidity setting value, the lower the air supply humidity is, so that the indoor humidity is quickly reduced to below the humidity setting value. Then, the heating effect of the first heat exchanger 306 is adjusted according to the fresh air temperature, so that T 送 >T 上 .

[0079] refer to Figure 6 In some embodiments, the control strategy includes entering the cooling and dehumidification mode when both the indoor and outdoor temperatures are higher than the cooling set value and both the indoor and outdoor humidity are higher than the dehumidification set value. In the cooling and dehumidification mode, the second pipeline 206 and the fifth control valve 207 are connected, the first pipeline 209, the third pipeline 203 and the fourth pipeline 210 are disconnected, and the four-way valve 102 is actuated. After the refrigerant is discharged from the exhaust port, it passes through the four-way valve 102 and the outdoor heat exchanger 103 and is divided into two paths. One path passes through the second pipeline. 206 flows to the first end of the accumulator 201, and after being overcooled by the accumulator 201, flows from the second end of the accumulator 201 to the first end of the dehumidification heat exchanger 304, and then flows back to the air intake from the dehumidification heat exchanger 304. The other path flows to the first end of the second heat exchanger 302 through the liquid side main pipe 4, and then flows back to the air intake through the gas side main pipe 5 and the four-way valve 102. The second heat exchanger 302 and the dehumidification heat exchanger 304 are both used to evaporate the refrigerant so that the temperature and humidity of the fresh air reach the set values.

[0080] Specifically, when the indoor and outdoor temperatures are both greater than 25°C, and the indoor and outdoor humidity are both greater than 50%, the cooling and dehumidification mode is entered, and the first valve port and the second valve port of the four-way valve 102 are controlled to be connected, and the third valve port and the fourth valve port are connected. The high-temperature refrigerant enters the outdoor heat exchanger 103 through the first valve port and the second valve port, condenses and enters the liquid side main pipe 4, and then the low-temperature refrigerant is divided into two paths. One path of refrigerant flows directly to the first end of the second heat exchanger 302 through the liquid side main pipe 4. The refrigerant evaporates at the second heat exchanger 302 to reduce the fresh air temperature, and then is discharged from the second heat exchanger 302. , flows out from the second end and flows back to the air intake through the gas side main pipe 5, the fourth valve port, the third valve port and the gas-liquid separator 105; the other refrigerant enters the first end of the accumulator 201 through the second pipeline 206, and the accumulator 201 further reduces the refrigerant temperature, and then the cold-treated refrigerant flows from the second end of the accumulator 201 into the first end of the dehumidification heat exchanger 304, and the refrigerant evaporates in the dehumidification heat exchanger 304 to further reduce the fresh air temperature, but the gaseous refrigerant flows out from the second end of the dehumidification heat exchanger 304 and flows back to the air intake through the gas-liquid separator 105.

[0081] During this process, the flow of the refrigerant in the second heat exchanger 302 and the dehumidification heat exchanger 304 is adjusted according to the temperature detection device and the humidity detection device so that the humidity of the fresh air satisfies the following relationship:

[0082] <![CDATA[H 内 ]]> <![CDATA[(H 上 ,H 上 +C1]]> <![CDATA[(H 上 +C1,H 上 +C2]]]> … <![CDATA[(H 上 +C n-1 ,H 上 +C n ]]]> <![CDATA[>H 上 +C n ]]> <![CDATA[H 送 ]]> <![CDATA[H 上 -D0]]> <![CDATA[H 上 -D1]]> … <![CDATA[H 上 -D n-1 ]]> <![CDATA[H 上 -D n ]]>

[0083] And the temperature of the fresh air satisfies the following relationship:

[0084] <![CDATA[T 内 ]]> <![CDATA[(T 上 ,T 上 +A1]]]> <![CDATA[(T 上 +A1,T 上 +A2]]]> … <![CDATA[(T 上 +A n-1 ,T 上 +A n ]]]> <![CDATA[>T 上 +A n ]]> <![CDATA[T 送 ]]> <![CDATA[T 上 -B0]]> <![CDATA[T 上 -B1]]> … <![CDATA[T 上 -B n-1 ]]> <![CDATA[T 上 -B n ]]>

[0085] In some embodiments, the control strategy includes heating the room when the indoor temperature is lower than the heating set value, and entering the heat release mode when the internal temperature of the accumulator 201 is greater than or equal to the first threshold. Figure 7 In the heat release mode, the first pipeline 209 and the second pipeline 206 are disconnected, the third pipeline 203, the fourth pipeline 210 and the fifth control valve 207 are connected, and the four-way valve 102 is actuated. After being discharged from the exhaust port, the refrigerant flows through the four-way valve 102 and the gas side main pipe 5 to the second end of the second heat exchanger 302, and then flows through the liquid side main pipe 4 and the fourth pipeline 210 to the second end of the accumulator 201. The refrigerant absorbs the energy of the accumulator 201 and evaporates, then is discharged from the first end of the accumulator 201 and flows back to the intake port through the third pipeline 203. The refrigerant is condensed in the second heat exchanger 302 to heat the fresh air. When the internal temperature of the accumulator 201 is lower than the first threshold, the heating mode is entered. Figure 4 In the heating mode, the fifth control valve 207 is disconnected and the four-way valve 102 is activated. After the refrigerant is discharged from the exhaust port, it flows through the four-way valve 102 and the gas side main pipe 5 to the second end of the second heat exchanger 302, and then flows back to the intake port through the liquid side main pipe 4, the outdoor heat exchanger 103 and the four-way valve 102. The refrigerant condenses in the second heat exchanger 302 to increase the temperature of the fresh air.

[0086] Specifically, during the heating season, the temperature and humidity detection device can be used to obtain indoor and outdoor temperature and humidity at a set detection frequency (e.g., every 5 minutes). For example, the upper limit of the temperature comfort range can be set to 30°C and the lower limit to 22°C. The heating setpoint is the lower limit of the temperature comfort range. When both the indoor and outdoor temperatures are below 22°C, heating is required. First, determine whether to enter the heating mode or the heat release mode based on the energy storage status of the accumulator 201. If the temperature in the accumulator 201 is lower than the first threshold, it is considered that the accumulator 201 has insufficient energy and enters the heating mode. The first valve port of the four-way valve 102 is controlled to be connected to the fourth valve port, and the second valve port is connected to the third valve port. After the high-temperature refrigerant is discharged from the exhaust port, it passes through the first valve port, the fourth valve port, and the gas side main pipe 5 to flow to the second end of the second heat exchanger 302. The high-temperature refrigerant condenses here, causing the fresh air temperature to increase. Then, the liquid refrigerant flows out from the first end of the second heat exchanger 302, flows through the liquid side main pipe 4 to the outdoor heat exchanger 103 and evaporates here. Then, the gaseous refrigerant flows back to the intake port through the second valve port, the third valve port and the gas-liquid separator 105.

[0087] If the temperature in the accumulator 201 is higher than the first threshold value, it is considered that the accumulator 201 has sufficient energy, and the heat release mode is entered. The first valve port and the fourth valve port of the four-way valve 102 are controlled to be connected. After the high-temperature refrigerant is discharged from the exhaust port, it passes through the first valve port, the fourth valve port, and the gas side main pipe 5 to flow to the second end of the second heat exchanger 302. The high-temperature refrigerant condenses here, and the fresh air temperature rises. Then, the liquid refrigerant flows out from the first end of the second heat exchanger 302, flows through the liquid side main pipe 4 and the fourth pipeline 210 to the second end of the accumulator 201, and the liquid refrigerant absorbs the energy of the accumulator 201 and evaporates. Then, the gaseous refrigerant flows out from the first end of the accumulator 201 and flows back to the intake port through the third pipeline 203 and the gas-liquid separator 105.

[0088] In the above two processes, the flow rate of the refrigerant flowing into the second heat exchanger 302 is continuously adjusted, and the heating effect of the second heat exchanger 302 is adjusted in real time so that the supply air temperature satisfies the following relationship:

[0089] <![CDATA[T 内 ]]> <![CDATA[[T 下 -E1,T 下 )]]> <![CDATA[[T 下 -E2,T 下 -E1)]]> … <![CDATA[[T 下 -AND n ,T 下 -AND n-1 )]]> <![CDATA[<T 下 -AND n ]]> <![CDATA[T 送 ]]> <![CDATA[T 下 +F0]]> <![CDATA[T 下 +F1]]> … <![CDATA[T 下 +F n-1 ]]> <![CDATA[T 下 +F n ]]>

[0090] Among them, E and F are parameters, and 0 <E1≤…≤E n , 0 <F0≤F1≤…≤F n That is, the further the indoor temperature falls below the lower limit of the temperature comfort zone, the higher the supply air temperature is set to quickly raise the indoor temperature to within the temperature comfort zone. The difference between the heating mode and the heat release mode is that the former involves the outdoor heat exchanger 103 in the refrigerant circulation path, causing the refrigerant that has condensed through heat exchange with the fresh air to evaporate again, while the latter involves the accumulator 201 in the refrigerant circulation path, using the energy stored in the accumulator 201 to evaporate again the refrigerant that has condensed through heat exchange with the fresh air.

[0091] In the heating season, if the outdoor heat exchanger 103 is involved in heating for a long time, the temperature of the outdoor unit will drop, thereby generating a defrosting demand. In some embodiments, the control strategy includes defrosting the outdoor unit 1 when the temperature of the heat exchange tube of the outdoor heat exchanger 103 is lower than the first defrosting setting value and the heating time of the outdoor heat exchanger 103 is greater than the second defrosting setting value, and entering the defrosting mode when the temperature in the accumulator 201 is lower than the second threshold value. Figure 8 In the defrost mode, the fifth control valve 207 and the first pipeline 209 are disconnected and the four-way valve 102 is activated. After the refrigerant is discharged from the exhaust port, it flows through the four-way valve 102, the outdoor heat exchanger 103 and the liquid side main pipe 4 to the first end of the second heat exchanger 302, and then flows back to the suction port through the gas side main pipe 5 and the four-way valve 102. The refrigerant condenses in the outdoor heat exchanger 103 and evaporates in the second heat exchanger 302, so that the environment near the outdoor heat exchanger 103 is heated to defrost. When the temperature in the accumulator 201 is greater than or equal to the second threshold, the heat release defrost mode is entered. Figure 9 In heat-release defrost mode, first pipe 209 and second pipe 206 are disconnected, fifth control valve 207, third pipe 203, and fourth pipe 210 are connected, and four-way valve 102 is actuated. Refrigerant is discharged from the exhaust port, passes through four-way valve 102, outdoor heat exchanger 103, and fourth pipe 210, and flows into the second end of accumulator 201. The refrigerant absorbs energy from accumulator 201, evaporates, and then flows back to the intake port through third pipe 203. The refrigerant condenses in outdoor heat exchanger 103, raising the ambient temperature near outdoor heat exchanger 103 and defrosting the air. Unlike conventional air conditioners, this system does not require indoor heat during defrosting, thus avoiding negative impacts on indoor temperature.

[0092] Specifically, when the heat exchanger tube temperature of the outdoor heat exchanger 103 is less than the first defrost setting value and the accumulated time is greater than the second defrost setting value, defrosting is considered necessary. At this point, the operating mode is determined based on the temperature inside the accumulator 201. When the internal temperature of the accumulator falls below the second threshold, the system enters defrost mode. In this mode, the refrigerant flow path is the same as in the cooling mode described above, and the details will not be repeated here. The only difference is that fresh air is no longer introduced into the room to reduce the negative impact on the indoor temperature.

[0093] When the internal temperature of the accumulator exceeds the second threshold, the system enters heat release defrost mode. At this point, accumulator 201 participates in the refrigerant circulation path, utilizing the energy of accumulator 201 for defrosting. Specifically, the first and second ports of four-way valve 102 are controlled to communicate, allowing high-temperature refrigerant to flow through them into outdoor heat exchanger 103. The refrigerant releases energy and condenses, raising the outdoor unit temperature to defrost. Low-temperature refrigerant then flows through fourth pipe 210 into the second end of accumulator 201. The energy from accumulator 201 is transferred to the refrigerant, causing it to evaporate and flow out of the first end of accumulator 201. The refrigerant then flows back through the gas-liquid separator to the intake port. Similarly, in this mode, fresh air is no longer introduced into the room, minimizing the negative impact on the indoor temperature.

[0094] refer to Figure 2 In some embodiments, the control strategy further includes entering ventilation mode when the outdoor temperature is within a set range and the outdoor humidity is less than a dehumidification set value. In this mode, the compressor 101 is turned off, and only fresh air is delivered into the room, allowing indoor and outdoor air to circulate without dehumidification or temperature control.

[0095] In some embodiments, adjusting the state of the energy accumulator includes storing energy in the energy accumulator 201 during periods of low electricity prices and releasing energy in periods of high electricity prices. Storing energy during nighttime periods of low electricity prices and releasing energy during daytime periods of high electricity prices further reduces operating costs and offers greater economic efficiency.

[0096] In summary, this control method enables fresh air air conditioning units to have multiple functions to meet the different needs of users. Combining the characteristics of phase change energy storage, which can achieve low-temperature cold storage and provide a low-temperature cold source, the low-temperature cold source provided is used to treat the wet load, and the temperature and humidity can be controlled independently. The investment in energy storage equipment is much smaller than that in the fresh air unit, further reducing operating costs and having high economic efficiency. The energy storage equipment can also store and release heat during heating, so it can also reduce operating costs and improve economic efficiency during the heating season. During defrosting, unlike ordinary air conditioners, there is no need to take heat from the room, avoiding a negative impact on the indoor temperature, and the stored energy can be used for defrosting, improving economic performance.

[0097] It should be understood that the specific values of the parameters or setting values involved in each of the above working modes can be set according to needs.

[0098] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to preferred embodiments, ordinary technicians in the field should understand that the specific implementation methods of the present invention can still be modified or some technical features can be replaced by equivalents without departing from the spirit of the technical solutions of the present invention. They should all be included in the scope of the technical solutions claimed for protection by the present invention.

Claims

1. A fresh air air conditioning unit, characterized in that: include: The indoor unit (3) comprises a fresh air duct (31), an air supply duct (32), a dehumidification heat exchanger (304) and a temperature-regulating heat exchanger, wherein the fresh air duct (31) is used to introduce fresh air, the dehumidification heat exchanger (304) is used to dehumidify the fresh air, the temperature-regulating heat exchanger is used to adjust the temperature of the fresh air, and the air supply duct (32) is used to discharge the processed fresh air into the room; Gas side main pipe (5); Liquid side main pipe (4); An outdoor unit (1) comprises a compressor (101), a four-way valve (102) and an outdoor heat exchanger (103); the compressor (101) has an air intake port and an air exhaust port; the air exhaust port of the compressor (101) is connected to the first valve port of the four-way valve (102); the second valve port of the four-way valve (102) is connected to the outdoor heat exchanger (103); the third valve port of the four-way valve (102) is connected to the air intake port of the compressor (101); the first end of the temperature-regulating heat exchanger is connected to the outdoor heat exchanger (103) via the liquid-side main pipe (4); and the second end of the temperature-regulating heat exchanger is connected to the fourth valve port of the four-way valve (102) via the gas-side main pipe (5); An energy storage device (2) comprises an accumulator (201) and a first pipeline (209), wherein a first end of the accumulator (201) is connected to the outdoor heat exchanger (103), a second end of the accumulator (201) is connected to a first end of the dehumidification heat exchanger (304), a second end of the dehumidification heat exchanger (304) is connected to the air intake port, and a first end of the accumulator (201) is connected to the air outlet via the first pipeline (209); and A control valve group, wherein the control valve group and the four-way valve (102) act together to change the flow path of the refrigerant so that the fresh air air conditioning unit switches between multiple working modes, wherein, in the dehumidification mode, the refrigerant discharged from the exhaust port of the compressor (101) enters the accumulator (201) from the first end of the accumulator (201) to be condensed and flows out from the second end of the accumulator (201), and evaporates in the dehumidification heat exchanger (304) to dehumidify the fresh air; The control valve group comprises a first control valve (208) arranged on the first pipeline (209), and the first control valve (208) is used to control the on-off of the first pipeline (209).

2. The fresh air air conditioning unit according to claim 1, characterized in that: The control valve group includes a first expansion valve (305) connected to the first end of the dehumidification heat exchanger (304); the refrigerant flows out from the second end of the accumulator (201) and enters the dehumidification heat exchanger (304) for evaporation after being throttled by the first expansion valve (305).

3. The fresh air air conditioning unit according to claim 1, characterized in that: The temperature-regulating heat exchanger includes a first heat exchanger (306) arranged downstream of the dehumidification heat exchanger (304) on the fresh air flow path. In the dehumidification mode, the refrigerant enters the first heat exchanger (306) from the fourth valve port of the four-way valve (102) and exchanges heat with the fresh air to increase the temperature of the fresh air.

4. The fresh air air conditioning unit according to claim 1, characterized in that: The temperature regulating heat exchanger includes a second heat exchanger (302) arranged upstream of the dehumidification heat exchanger (304) on the fresh air flow path, and the second heat exchanger (302) has a condensing state and an evaporating state so that the fresh air air conditioning unit can switch between heating and cooling states.

5. The fresh air air conditioning unit according to claim 1, characterized in that: The energy storage device (2) further comprises a second pipeline (206), a first end of the energy accumulator (201) being connected to the liquid side main pipe (4) and the first pipeline (209) via the second pipeline (206), and the control valve group comprising a second control valve (205) arranged on the second pipeline (206), the second control valve (205) being used to control the on-off of the second pipeline (206).

6. The fresh air air conditioning unit according to claim 5, characterized in that: The control valve group further includes a fifth control valve (207), the second pipeline (206) and the liquid side main pipe (4) are connected via the fifth control valve (207), and the fifth control valve (207) is used to connect or disconnect the second pipeline (206) and the liquid side main pipe (4).

7. The fresh air air conditioning unit according to claim 1, characterized in that: The energy storage device (2) further comprises a third pipeline (203) and a fourth pipeline (210); the first end of the energy storage device (201) is connected to the air intake port via the third pipeline (203); the second end of the energy storage device (201) is connected to the first pipeline (209) via the fourth pipeline (210); the control valve group comprises a third control valve (202) arranged on the third pipeline (203) and a fourth control valve (211) arranged on the fourth pipeline (210); the third control valve (202) is used to control the on-off of the third pipeline (203); and the fourth control valve (211) is used to control the on-off of the fourth pipeline (210).

8. The fresh air air conditioning unit according to claim 1, characterized in that: The energy storage device (2) further comprises a first pipeline (209), a second pipeline (206), a third pipeline (203) and a fourth pipeline (210); the temperature regulating heat exchanger comprises a first heat exchanger (306) and a second heat exchanger (302); the first heat exchanger (306) is arranged downstream of the dehumidification heat exchanger (304) on the fresh air flow path; the second heat exchanger (302) is arranged upstream of the dehumidification heat exchanger (304) on the fresh air flow path; the energy storage device (2) further comprises a first pipeline (209), a second pipeline (206), a third pipeline (203) and a fourth pipeline (210); the temperature regulating heat exchanger comprises a first heat exchanger (306) and a second heat exchanger (302); the first heat exchanger (306) is arranged downstream of the dehumidification heat exchanger (304) on the fresh air flow path; The first end of the accumulator (201) is connected to the exhaust port via the first pipeline (209), connected to the liquid side main pipe (4) and the first pipeline (209) via the second pipeline (206), and connected to the exhaust port via the third pipeline (203); the second end of the accumulator (201) is connected to the first pipeline (209) via the fourth pipeline (210); the first end of the first heat exchanger (306) and the second heat exchanger (30 2) are connected to one end of the outdoor heat exchanger (103) through the liquid side main pipe (4), and the second ends of the first heat exchanger (306) and the second heat exchanger (302) are connected to the fourth valve port of the four-way valve (102) through the gas side main pipe (5). The control valve group includes a first control valve (208) provided on the first pipeline (209) for controlling the on-off of the first pipeline (209), a second control valve (205) provided on the second pipeline (206) for controlling the on-off of the second pipeline (206), a third control valve (202) provided on the third pipeline (203) for controlling the on-off of the third pipeline (203), a fourth control valve (211) provided on the fourth pipeline (210) for controlling the on-off of the fourth pipeline (210), and a fifth control valve (207) for connecting or disconnecting the second pipeline (206) and the liquid side main pipe (4).

9. The fresh air air conditioning unit according to any one of claims 1 to 8, characterized in that: The outdoor unit (1) further comprises a gas-liquid separator (105), which is connected to the air intake port. The gas-liquid separator (105) is used to separate the refrigerant into gas and liquid. When the refrigerant flows toward the air intake port, it is first processed by the gas-liquid separator (105) and then flows back to the air intake port.

10. The fresh air air conditioning unit according to any one of claims 1 to 8, characterized in that: The indoor unit (3) further comprises an exhaust passage (33) and a total heat exchanger (301), wherein the total heat exchanger (301) is arranged at the entrance of the fresh air passage (31), and the exhaust passage (33) is connected to the total heat exchanger (301) so that the fresh air first exchanges heat with the air discharged from the exhaust passage (33) in the total heat exchanger (301) before entering the air supply passage (32).

11. A control method for a fresh air air conditioning unit according to any one of claims 1 to 7, characterized in that: The steps include: Obtaining the temperature and humidity of indoor air and the temperature and humidity of outdoor air; obtaining a control strategy based on the temperature and humidity of the indoor air and the temperature and humidity of the outdoor air; as well as The states of the dehumidification heat exchanger (304), the temperature regulating heat exchanger, and the accumulator (201) are adjusted according to the control strategy to enable the fresh air air conditioning unit to switch between multiple operating modes.

12. The control method of the fresh air air conditioning unit according to claim 11, characterized in that: The control strategy includes controlling the fresh air air conditioning unit to enter a dehumidification mode when the temperature of the indoor and outdoor air is within a set range and the humidity of the indoor air is higher than a dehumidification set value. In the dehumidification mode, the refrigerant is discharged from the exhaust port and flows into the first end of the accumulator (201) for condensation and flows out from the second end of the accumulator (201), and evaporates in the dehumidification heat exchanger (304) to dehumidify the fresh air.

13. A control method for the fresh air air conditioning unit according to claim 8, characterized in that: The steps include: Obtaining the temperature and humidity of indoor air and the temperature and humidity of outdoor air; obtaining a control strategy based on the temperature and humidity of the indoor air and the temperature and humidity of the outdoor air; as well as The states of the dehumidification heat exchanger (304), the temperature regulating heat exchanger, and the accumulator (201) are adjusted according to the control strategy to enable the fresh air air conditioning unit to switch between multiple operating modes.

14. The control method of the fresh air air conditioning unit according to claim 13, characterized in that: The working modes of the fresh air air conditioning unit include cooling mode, dehumidification mode, cooling and dehumidification mode, heating mode, heat release mode, defrost mode, heat release and defrost mode, and ventilation mode.

15. The control method of the fresh air air conditioning unit according to claim 14, characterized in that: The control strategy includes entering a cooling mode when the temperature of the indoor air is higher than a cooling set value and the indoor humidity is lower than a dehumidification set value. In the cooling mode, the fifth control valve (207) and the first pipeline (209) are disconnected and the four-way valve (102) is actuated. After the refrigerant is discharged from the exhaust port, it flows through the four-way valve (102), the outdoor heat exchanger (103) and the liquid side main pipe (4) to the first end of the second heat exchanger (302), and then flows back to the air intake port through the gas side main pipe (5) and the four-way valve (102). The refrigerant evaporates in the second heat exchanger (302) to cool the fresh air.

16. The control method of the fresh air air conditioning unit according to claim 14, characterized in that: The control strategy includes entering a dehumidification mode when the indoor and outdoor temperatures are within a set range and the indoor humidity is higher than a dehumidification set value. In the dehumidification mode, the first pipeline (209) and the second pipeline (206) are connected, the third pipeline (203), the fourth pipeline (210) and the fifth control valve (207) are disconnected, and the four-way valve (102) is actuated. After the refrigerant is discharged from the exhaust port, it is divided into two paths. One path flows through the first pipeline (209) to the first end of the accumulator (201), and after condensation treatment in the accumulator (201), it is discharged from the accumulator (201). ) flows from the second end of the dehumidification heat exchanger (304) to the first end of the dehumidification heat exchanger (304), and then flows back from the dehumidification heat exchanger (304) to the air intake port, and the other path flows through the four-way valve (102) and the gas side main pipe (5) to the second end of the first heat exchanger (306), and then flows back to the air intake port through the liquid side main pipe (4), the outdoor heat exchanger (103) and the four-way valve (102). One path of refrigerant evaporates in the dehumidification heat exchanger (304), and the other path of refrigerant condenses in the first heat exchanger (306). The temperature of the fresh air is first reduced to below the set temperature and then increased to the set range for dehumidification.

17. The control method of the fresh air air conditioning unit according to claim 14, characterized in that: The control strategy includes entering the cooling and dehumidification mode when the indoor and outdoor temperatures are both higher than the cooling set value and the indoor and outdoor humidity are both higher than the dehumidification set value. In the cooling and dehumidification mode, the second pipeline (206) and the fifth control valve (207) are connected, the first pipeline (209), the third pipeline (203) and the fourth pipeline (210) are disconnected, and the four-way valve (102) is actuated. After the refrigerant is discharged from the exhaust port, it passes through the four-way valve (102) and the outdoor heat exchanger (103) and is divided into two paths. One path flows through the second pipeline (206) to the outdoor heat exchanger (103). The first end of the accumulator (201) flows from the second end of the accumulator (201) to the first end of the dehumidification heat exchanger (304) after being overcooled by the accumulator (201), and then flows back from the dehumidification heat exchanger (304) to the air intake port. The other path flows to the first end of the second heat exchanger (302) through the liquid side main pipe (4), and then flows back to the air intake port through the gas side main pipe (5) and the four-way valve (102). The second heat exchanger (302) and the dehumidification heat exchanger (304) are both used to evaporate the refrigerant so that the temperature and humidity of the fresh air reach the set values.

18. The control method of the fresh air air conditioning unit according to claim 14, characterized in that: The control strategy includes heating the room when the indoor temperature is lower than the heating set value, wherein When the internal temperature of the accumulator (201) is greater than or equal to the first threshold value, the heat release mode is entered. In the heat release mode, the first pipeline (209) and the second pipeline (206) are disconnected, the third pipeline (203), the fourth pipeline (210) and the fifth control valve (207) are connected, and the four-way valve (102) is actuated. After the refrigerant is discharged from the exhaust port, it flows through the four-way valve (102) and the gas side main pipe (5) to the second end of the second heat exchanger (302), and then flows through the liquid side main pipe (4) and the fourth pipeline (210) to the second end of the accumulator (201). The refrigerant absorbs the energy of the accumulator (201) and evaporates, and then is discharged from the first end of the accumulator (201) and flows back to the air intake port through the third pipeline (203). The refrigerant is condensed in the second heat exchanger (302) to increase the temperature of the fresh air. When the internal temperature of the accumulator (201) is lower than the first threshold value, the heating mode is entered. In the heating mode, the fifth control valve (207) is disconnected and the four-way valve (102) is actuated. After the refrigerant is discharged from the exhaust port, it flows through the four-way valve (102) and the gas side main pipe (5) to the second end of the second heat exchanger (302), and then flows back to the intake port through the liquid side main pipe (4), the outdoor heat exchanger (103) and the four-way valve (102). The refrigerant condenses in the second heat exchanger (302) to increase the temperature of the fresh air.

19. The control method of the fresh air air conditioning unit according to claim 14, characterized in that: The control strategy includes defrosting the outdoor unit (1) when the temperature of the heat exchange tube of the outdoor heat exchanger (103) is lower than a first defrost setting value and the heating time of the outdoor heat exchanger (103) is greater than a second defrost setting value, wherein When the temperature in the accumulator (201) is lower than the second threshold value, the defrost mode is entered. In the defrost mode, the fifth control valve (207) and the first pipeline (209) are disconnected and the four-way valve (102) is actuated. After the refrigerant is discharged from the exhaust port, it flows to the first end of the second heat exchanger (302) through the four-way valve (102), the outdoor heat exchanger (103) and the liquid side main pipe (4), and then flows back to the air intake port through the gas side main pipe (5) and the four-way valve (102). The refrigerant condenses in the outdoor heat exchanger (103) and evaporates in the second heat exchanger (302), so that the environment near the outdoor heat exchanger (103) is heated to defrost. When the temperature in the accumulator (201) is greater than or equal to a second threshold value, the heat release defrost mode is entered. In the heat release defrost mode, the first pipeline (209) and the second pipeline (206) are disconnected, the fifth control valve (207), the third pipeline (203) and the fourth pipeline (210) are connected, and the four-way valve (102) is actuated. After being discharged from the exhaust port, the refrigerant flows into the second end of the accumulator (201) through the four-way valve (102), the outdoor heat exchanger (103) and the fourth pipeline (210). The refrigerant absorbs the energy of the accumulator (201) and evaporates, and then flows back to the air intake port through the third pipeline (203). The refrigerant condenses in the outdoor heat exchanger (103), so that the environment near the outdoor heat exchanger (103) is heated to defrost.

20. The control method of the fresh air air conditioning unit according to any one of claims 13 to 19, characterized in that: The state of the energy accumulator is adjusted to include: allowing the energy accumulator (201) to store energy during a period when the power supply system is at a low electricity price; and allowing the energy accumulator (201) to release energy during a period when the power supply system is at a high electricity price.

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