CN106907801A - Air-conditioner - Google Patents

Abstract

The invention discloses an air conditioner, comprising an air conditioning system and a solution circulation system, the solution circulation system has a dehumidification mode and a humidification mode, and the air conditioning system comprises a compressor, a four-way valve, an indoor heat exchanger, an outdoor heat exchanger and a throttling device The solution circulation system includes a dehumidification device and a regeneration device. When the solution circulation system is in the dehumidification mode, the pipeline between the inlet end of the dehumidification device and the outlet end of the regeneration device is connected to the return gas pipeline of the compressor for heat exchange. In the present invention, the regeneration solution is cooled by the return air of the compressor through the return air pipeline, and the cooled regeneration solution enters the dehumidification device to dehumidify the indoor air, which can ensure that no heat load is brought into the dehumidification process and affect the cooling effect of the air conditioner , so that the solution dehumidification process is cooled to achieve isothermal dehumidification. The air conditioner, the air conditioning system and the solution circulation system operate independently of each other, so that the combination of dehumidification and temperature regulation is easy to realize the dual control of indoor temperature and humidity.

Description

air conditioner

technical field

The invention relates to the technical field of air conditioning, in particular to an air conditioner.

Background technique

With the improvement of people's living standards, people pay more and more attention to the quality of the indoor environment. However, if the humidity of the indoor environment is too high or too low, the comfort of the indoor environment will be destroyed.

In summer, traditional air conditioners use condensation dehumidification to dehumidify. The temperature of cold water must be lower than the dew point temperature of the air, resulting in a waste of energy utilization. In some occasions, the air needs to be reheated, which results in energy consumption. Further waste. The air is regulated by condensation, the heat-humidity ratio of the air-conditioning unit can only be changed within a certain range, and it is difficult to adapt to the change of the indoor heat-humidity ratio, and most air conditioners run in summer when the surface is wet, which provides a good environment for the growth of various microorganisms condition. These are the drawbacks that exist in traditional air conditioning systems.

In winter, when the air conditioner is heating, the air will inevitably be dry. The dry environment weakens the ability of the human respiratory system to filter dust and bacteria, make people feel dry mouth, and even nosebleeds, reducing human immunity. It is easier to get sick in a room that uses heating and air conditioning. In terms of comfort, when the air is dry, the evaporation of water in the body increases, so the body temperature feels low even when heating. In addition, static electricity in dry air is inevitable. Severe static electricity will make people feel irritable, dizzy, chest tightness, and throat and nose discomfort. Therefore, in order to construct a comfortable indoor environment, it is very necessary to adjust the temperature and humidity of the air.

The dehumidification and humidification equipment currently on the market are not well integrated with air conditioners. For example, separate humidification products include ultrasonic water mist humidifiers, high-pressure spray humidifiers, etc., and dehumidification products include separate dehumidifiers and rotary dehumidifiers. air conditioning etc. Except for the rotary dehumidification air conditioner, which has the function of adjusting temperature and humidity at the same time, other products have a relatively narrow range of action. Rotary dehumidification air conditioners also do not have a humidification function, and are not accepted by consumers due to their complex structure, high cost and operating expenses.

Contents of the invention

The object of the present invention is to propose an air conditioner that combines dehumidification and temperature regulation, has a simple structure, low operating cost, and is easy to realize dual control of indoor temperature and humidity.

According to one aspect of the present invention, an air conditioner is provided, including an air conditioning system and a solution circulation system, the solution circulation system has a dehumidification mode and a humidification mode, and the air conditioning system includes a compressor, a four-way valve, an indoor heat exchanger, an outdoor heat exchanger The solution circulation system includes a dehumidification device and a regeneration device. When the solution circulation system is in the dehumidification mode, the pipeline between the inlet port of the dehumidification device and the outlet port of the regeneration device is connected to the return air line of the compressor for heat exchange. .

In the present invention, when the air conditioning system is running for cooling, the indoor air humidity is high, the solution circulation system enters the dehumidification mode, the regeneration solution flowing out of the regeneration device is cooled by the return air of the compressor through the return air pipeline, and the cooled regeneration solution enters the dehumidification mode. The device dehumidifies the indoor air, cooling the regenerated solution before entering the dehumidification device can ensure that no additional heat load is brought in during the dehumidification process, affecting the cooling effect of the air conditioner, and at the same time the solution dehumidification process can be cooled to achieve isothermal dehumidification The process reduces the irreversible loss. When the air conditioning system is running for heating, the indoor air is dry, and the solution circulation system is running in humidification mode. The air conditioner, the air conditioning system and the solution circulation system operate independently of each other, so that the dehumidification and temperature regulation are combined, the structure is simple, the operation cost is low, and the indoor temperature and humidity dual control is easy to be realized.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention.

Description of drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description serve to explain the principles of the invention.

Fig. 1 is the structural diagram of the air conditioner of the first embodiment of the present invention;

Fig. 2 is a structural diagram of the air conditioner operating in the dehumidification mode according to the first embodiment of the present invention; and

Fig. 3 is a structural diagram of the air conditioner operating in the humidification mode according to the first embodiment of the present invention.

Description of reference signs: 1. compressor; 2. four-way valve; 3. indoor heat exchanger; 4. outdoor heat exchanger; 5. throttling device; 6. dehumidification device; 7. regeneration device; 8. first 9. The second heat exchanger; 10. The first solution pump; 11. The second solution pump; 12. The third heat exchanger; 13. The solution cooler.

detailed description

The following description and drawings illustrate specific embodiments of the invention sufficiently to enable those skilled in the art to practice them. Other embodiments may incorporate structural, logical, electrical, process, and other changes. The examples merely represent possible variations. Individual components and functions are optional unless explicitly required, and the order of operations may vary. Portions and features of some embodiments may be included in or substituted for those of other embodiments. The scope of embodiments of the present invention includes the full scope of the claims, and all available equivalents of the claims. Herein, various embodiments may be referred to individually or collectively by the term "invention", which is for convenience only and is not intended to automatically limit the scope of this application if in fact more than one invention is disclosed. A single invention or inventive concept. Herein, relational terms such as first and second etc. are used only to distinguish one entity or operation from another without requiring or implying any actual relationship or relationship between these entities or operations. order. Furthermore, the term "comprises", "comprises" or any other variation thereof is intended to cover a non-exclusive inclusion such that a process, method or apparatus comprising a set of elements includes not only those elements but also other elements not expressly listed elements, or also include elements inherent in such a process, method, or apparatus. Without further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of additional identical elements in the process, method or apparatus comprising said element. Various embodiments herein are described in a progressive manner, each embodiment focuses on the differences from other embodiments, and the same and similar parts of the various embodiments may be referred to each other. As for the methods, products, etc. disclosed in the examples, since they correspond to the methods disclosed in the examples, the description is relatively simple, and for relevant details, please refer to the description of the methods.

In the present invention, the solution flowing out of the regeneration device before entering the dehumidification device is the regeneration solution, and the solution flowing out of the dehumidification device before entering the regeneration device is the dehumidification solution.

Referring to Fig. 1, according to an embodiment of the present invention, an air conditioner includes an air conditioning system and a solution circulation system, the solution circulation system has a dehumidification mode and a humidification mode, and the air conditioning system includes a compressor 1, a four-way valve 2, and an indoor heat exchanger 3. The outdoor heat exchanger 4 and the throttling device 5. The solution circulation system includes a dehumidification device 6 and a regeneration device 7. When the solution circulation system is in the dehumidification mode, the pipe between the inlet end of the dehumidification device 6 and the outlet end of the regeneration device 7 The road is connected to the return gas pipeline of the compressor 1 for heat exchange. As shown in FIG. 1 , the dehumidification device 6 is located on the indoor side, and the regeneration device 7 is located on the outdoor side. The inlet end of the dehumidification device 6 is located at the upper part of the dehumidification device 6, and the outlet end of the regeneration device 7 is located at the lower part of the regeneration device 7, and the pipeline between the inlet end of the dehumidification device 6 and the outlet end of the regeneration device 7 refers to from The pipeline from the outlet end of the regeneration device 7 to the inlet end of the dehumidification device 6 . Wherein the dehumidification device 6 and the regeneration device 7 all include a solution spray pipe and a solution collection tank, and the solution spray pipe is positioned above the solution spray tank, so that the solution is sprayed out from the solution spray pipe and is completely collected by the solution spray tank rise, and then flow out through the outlet port below the solution spray tank to circulate in the solution circulation system.

In the present invention, when the air conditioning system is running for cooling, the indoor air humidity is high, the solution circulation system enters the dehumidification mode, the regeneration solution flowing out of the regeneration device 7 is cooled by the return air of the compressor through the return air pipeline, and the cooled regeneration solution enters the The dehumidification device 6 dehumidifies the indoor air, cooling the regeneration solution before entering the dehumidification device can ensure that no additional heat load is brought in during the dehumidification process, affecting the cooling effect of the air conditioner, and at the same time, the solution dehumidification process can be cooled to achieve isothermal The dehumidification process reduces the irreversible loss. As shown in Figure 1, the dehumidification device 6 is located near the indoor heat exchanger 3, and the indoor fan is used to perform forced convection on the air, so that the humid air passing through the indoor heat exchanger 3 flows through the dehumidification device 6 and becomes dry air to flow into the room, thereby realizing The purpose of dehumidifying indoor air. When the air conditioning system is running for heating, the indoor air is dry, and the solution circulation system is running in humidification mode. In the air conditioner, the air conditioning system and the solution circulation system operate independently of each other, so that dehumidification and temperature regulation are combined, the structure is simple, the operation cost is low, and it is easy to realize dual control of indoor temperature and humidity.

In the above-mentioned embodiment, there are many ways to realize that the regeneration solution flowing out of the regeneration device 7 is cooled by the return air of the compressor 1 through the return air pipeline. Optionally, a first heat exchanger 8 is arranged on the return air pipeline, and the solution When the circulation system is in the dehumidification mode, the regeneration solution flows through the first heat exchanger 8 to exchange heat with the return air pipeline and then enters the dehumidification device 6 . The return air pipeline is a low-temperature and low-pressure refrigerant, and the regeneration solution flows through the first heat exchanger 8 to exchange heat with the refrigerant in the return air pipeline, thereby reducing the temperature of the regeneration solution, and the cooled regeneration solution enters the dehumidification device 6 for indoor air Dehumidification can ensure that no additional heat load is brought in during the dehumidification process, thereby ensuring the cooling effect of the air conditioner.

In the above embodiment, the solution circulation system further includes a second heat exchanger 9 where the dehumidification solution and the regeneration solution exchange heat. In the embodiment of the present invention, the dehumidification solution is the solution flowing from the indoor dehumidification device 6, so the temperature of the dehumidification solution is relatively low, and the regeneration solution is the solution flowing from the regeneration device 7, so the temperature of the regeneration solution is relatively high. The dehumidification solution needs to flow into the regeneration device 7 for solution regeneration and reuse, so the dehumidification solution needs to be heated, and the regeneration solution needs to flow into the dehumidification device 6 to dehumidify the indoor air, so the regeneration solution needs to be cooled, and the dehumidification solution can be realized by using the second heat exchanger 9 The heat exchange with the regeneration solution can reduce the temperature of the regeneration solution and increase the temperature of the dehumidification solution at the same time, and can also achieve the purpose of saving energy.

Optionally, in any of the above embodiments, the dehumidification solution at the outlet end of the dehumidification device 6 passes through the second heat exchanger 9, and the dehumidification solution pipeline between the outlet end of the dehumidification device 6 and the second heat exchanger 9 is provided with a second A solution pump 10 . The dehumidification solution at the outlet end of the dehumidification device 6 passes through the second heat exchanger 9, so as to exchange heat with the regeneration solution in the second heat exchanger 9, and the dehumidification solution can flow from the dehumidification device 6 by using the first solution pump 10 In the regeneration device 7.

Optionally, in any of the above embodiments, a second solution pump 11 is provided on the regeneration solution pipeline between the outlet end of the regeneration device 7 and the inlet end of the first heat exchanger 8 . Using the second solution pump 11 , the regeneration solution flowing out from the outlet of the regeneration device 7 can flow into the first heat exchanger 8 .

In any of the above-mentioned embodiments, a third heat exchanger 12 is provided on the exhaust pipeline of the compressor 1, and the third heat exchanger 12 is used to exchange heat for the dehumidification solution when the solution circulation system is in the dehumidification mode. When the solution circulation system is in heating mode, it is used to exchange heat between the regeneration solution and the exhaust gas.

As shown in Figures 1 and 2, when the solution circulation system is in the dehumidification mode, the low-temperature and high-concentration solution flows into the dehumidification device 6 to absorb moisture in the indoor air, so that the solution flowing out from the dehumidification device 6 is a low-temperature and low-concentration dehumidification solution. The low-temperature and low-concentration dehumidification solution flows through the second heat exchanger 9 to exchange heat with the regeneration solution, and then flows through the third heat exchanger 12 to exchange heat with the exhaust gas of the compressor 1 to become a high-temperature and low-concentration dehumidification solution , flows into the regeneration device 7, the regeneration device 7 is located near the outdoor heat exchanger 4, uses the outdoor fan to force air convection to analyze the water in the high-temperature and low-concentration dehumidification solution, so the solution flowing out from the regeneration device 7 becomes high-temperature and high-concentration regeneration solution, the high-temperature and high-concentration regeneration solution flows into the second heat exchanger 9 to exchange heat with the dehumidification solution, and then flows into the first heat exchanger 8 to exchange heat with the return air of the compressor 1 to become a low-temperature and high-concentration regeneration solution , the low-temperature and high-concentration regeneration solution flows into the dehumidification device 6 and so on. In the present invention, the third heat exchanger 12 is used to heat the dehumidification solution when the solution circulation system is in the dehumidification mode, so that the temperature of the dehumidification solution can be further increased, so that the temperature of the dehumidification solution entering the regeneration device 7 is higher and more precipitation occurs. moisture and improve dehumidification efficiency.

As shown in Figures 1 and 3, when the solution circulation system is in the humidification mode, the high-temperature and low-concentration solution flows into the dehumidification device 6 (at this time, the dehumidification device 6 is used for humidification), and the indoor fan forces air convection to separate out the moisture in the solution. Therefore, the solution flowing out from the dehumidification device 6 is a high-temperature and high-concentration dehumidification solution. The high-temperature and high-concentration dehumidification solution flows through the second heat exchanger 9 to exchange heat with the regeneration solution, and becomes a low-temperature and high-concentration dehumidification solution. The dehumidification solution flows into the regeneration device 7, and the outdoor fan forces air convection to absorb moisture in the air, so that the regeneration solution flowing out from the regeneration device 7 is a low-temperature and low-concentration regeneration solution, and the low-temperature and low-concentration regeneration solution flows through the third heat exchanger 12 and The exhaust from the compressor 1 undergoes heat exchange to become a high-temperature and low-concentration regeneration solution, and the high-temperature and low-concentration regeneration solution flows into the dehumidifier 6 to humidify the indoor air, and so on. Through the third heat exchanger 12, the heat exchange between the regeneration solution and the exhaust gas of the compressor 1 can be carried out, and the temperature of the regeneration solution can be increased. The heated regeneration solution can humidify the indoor air to ensure that the indoor heating effect is not affected while humidifying. Improve user experience.

In the above embodiment, a solution cooler 13 is also provided between the regeneration device 7 and the outdoor heat exchanger 4, the first end of the solution cooler 13 is selectively communicated with the dehumidification solution, and the second end of the solution cooler 13 is connected to the The dehumidification solution pipeline at the inlet end of the regeneration device 7 can be selectively communicated with. When the solution circulation system runs the dehumidification mode, as shown in Figure 2, the first end of the solution cooler 13 is not connected to the dehumidification solution, and the second end of the solution cooler 13 is not connected to the dehumidification solution pipeline at the inlet end of the regeneration device 7 . When the solution circulation system operates in the humidification mode, the first end of the solution cooler 13 is communicated with the dehumidification solution as shown in Figure 3, and the second end of the solution cooler 13 is communicated with the dehumidification solution pipeline at the inlet end of the regeneration device 7. In this case, the temperature of the dehumidification solution is relatively high, and the temperature of the dehumidification solution can be further reduced by the solution cooler 13, so that the dehumidification solution can fully absorb the moisture in the outdoor air and improve the humidification efficiency.

Optionally, in the above embodiment, as shown in FIG. 1 , the inlet end of the first heat exchanger 8 and the inlet end of the third heat exchanger 12 are also connected with a first regulating pipeline, and the third heat exchanger 12 A second adjustment pipeline is connected between the inlet end of the first adjustment pipeline and the dehumidification solution pipeline passing through the second heat exchanger 9, and the first end of the first adjustment pipeline and the inlet end of the first heat exchanger 8 are optionally It is communicated with the outlet end of the second heat exchanger 9, the first end of the second regulating pipeline and the second end of the solution cooler 13 are optionally communicated with the dehumidification solution pipeline, the second end of the first regulating pipeline and The second end of the second regulating pipeline is selectively communicated with the inlet end of the third heat exchanger 12 .

In the above-mentioned embodiment, as shown in Figure 1, a three-way valve is connected between the inlet port of the first heat exchanger 8, the outlet port of the second heat exchanger 9, and the first end of the first regulating pipeline. When the circulation system operates in dehumidification mode, as shown in Figure 1 and Figure 2, the three-way valve is controlled to make the inlet port of the first heat exchanger 8 communicate with the outlet port of the second heat exchanger 9, so that the second heat exchanger 9 The regeneration solution inside passes through the first heat exchanger 8 to become a low-temperature and high-concentration regeneration solution; as shown in Figure 1 and Figure 3, when the solution circulation system is in the operating humidification mode, the three-way valve is controlled to make the first regulating pipeline The first end is connected to the outlet end of the second heat exchanger 9, so that the regeneration solution in the second heat exchanger 9 passes through the third heat exchanger 12 to become a high-temperature and low-concentration regeneration solution. As shown in Figure 1, a three-way valve is connected between the dehumidification solution pipeline passing through the second heat exchanger 9, the first end of the second regulating pipeline and the first end of the solution cooler 13, as shown in Figure 1 and as As shown in 2, when the solution circulation system operates in the dehumidification mode, the dehumidification solution pipeline passing through the second heat exchanger 9 is connected to the first end of the second regulating pipeline, so that the dehumidification solution passing through the second heat exchanger The dehumidification solution of 9 passes through the third heat exchanger 12 to become a high-temperature and low-concentration dehumidification solution; The solution communicates with the first end of the solution cooler 13, so that the dehumidification solution passed through the second heat exchanger 9 passes through the solution cooler 13 to become a low-temperature and high-concentration dehumidification solution. As shown in Figure 1, a three-way valve is connected between the inlet end of the third heat exchanger 13, the second end of the first regulating pipeline and the second end of the second regulating pipeline, as shown in Figures 1 and 3 As shown, when the solution circulation system is in the humidification mode, the three-way valve is controlled to connect the inlet end of the third heat exchanger 12 to the second end of the first regulating pipeline, so that the regeneration solution in the second heat exchanger 9 After passing through the third heat exchanger 12, it becomes a regeneration solution with high temperature and low concentration; The inlet end of 12 is connected, so that the dehumidification solution passing through the second heat exchanger 9 passes through the third heat exchanger 12 to become a high-temperature and low-concentration dehumidification solution.

Optionally, in the above implementation, a third adjustment pipeline is connected between the inlet end of the dehumidification device 6 and the outlet end of the third heat exchanger 12, and the first end of the third adjustment pipeline and the inlet of the regeneration device 7 The second end of the third regulating pipeline and the outlet end of the first heat exchanger 8 are selectively communicated with the inlet end of the dehumidification device 6 .

As shown in Figure 1, a three-way valve is connected to the first end of the third regulating pipeline, the outlet end of the third heat exchanger 12, and the inlet end of the regeneration device 7, as shown in Figures 1 and 2, when the solution circulates When the system operates in dehumidification mode, the outlet port of the third heat exchanger 12 is connected with the inlet port of the regeneration device 7, so that the high-temperature and low-concentration dehumidification solution in the third heat exchanger 12 becomes high-temperature and high-concentration solution through the regeneration device 7 The regeneration solution; As shown in Figure 1 and Figure 3, when the solution circulation system runs humidification mode, the outlet end of the third heat exchanger 12 is communicated with the first end of the third regulating pipeline, so that the third heat exchange The high-temperature and low-concentration regenerating solution in the device 12 passes through the dehumidification device 6 to become a high-temperature and high-concentration dehumidification solution. As shown in Figure 1, a three-way valve is connected to the second end of the third regulating pipeline, the inlet end of the dehumidification device 6 and the outlet end of the first heat exchanger 8, as shown in Figure 1 and Figure 2, when the solution circulates When the system operates in the dehumidification mode, the outlet port of the first heat exchanger 8 is connected to the inlet port of the dehumidification device 6, so that the low-temperature and high-concentration regeneration solution flows through the dehumidification device 6 to become a low-temperature and high-concentration dehumidification solution; as shown in Figure 1 As shown in Figure 3, when the solution circulation system operates in the humidification mode, the second end of the third regulating pipeline is communicated with the dehumidification device 6, so that the high-temperature and low-concentration regeneration solution flows through the dehumidification device 6 to become high-temperature and high-concentration Dehumidification solution.

In any of the above-mentioned embodiments, the switching between the dehumidification mode and the humidification mode of the solution circulation system is realized through a three-way valve, or through a two-way valve, as long as the communication between the various accessories can be realized. In the humidification mode, a solution cooler 13 is added. The solution cooler 13 can use a plastic tube, and it is enough to go around the air inlet of the outdoor unit twice. The cooling of the dehumidification solution is sufficient.

It should be understood that the present invention is not limited to the processes and structures that have been described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from the scope thereof. The scope of the invention is limited only by the appended claims.

Claims (9)

1. An air conditioner, characterized in that it comprises an air conditioning system and a solution circulation system, the solution circulation system has a dehumidification mode and a humidification mode, and the air conditioning system comprises a compressor, a four-way valve, an indoor heat exchanger, an outdoor heat exchanger Heater and throttling device, the solution circulation system includes a dehumidification device and a regeneration device, when the solution circulation system is in the dehumidification mode, the pipeline between the inlet end of the dehumidification device and the outlet end of the regeneration device is connected to the The return gas pipeline of the compressor is connected with heat exchange. 2. The air conditioner according to claim 1, wherein a first heat exchanger is arranged on the return air pipeline, and when the solution circulation system is in the dehumidification mode, the regeneration solution flows through the first heat exchanger After exchanging heat with the return air pipeline, it enters the dehumidification device. 3. The air conditioner according to claim 2, wherein the solution circulation system further comprises a second heat exchanger, and the dehumidification solution and the regeneration solution exchange heat at the second heat exchanger. 4. The air conditioner according to claim 2, characterized in that, the dehumidification solution pipeline at the outlet end of the dehumidification device passes through the first heat exchanger, and the outlet end of the dehumidification device is connected to the first heat exchanger. A first solution pump is arranged on the dehumidification solution pipeline between the exchangers. 5. The air conditioner according to claim 2, characterized in that a second solution pump is provided on the regeneration solution pipeline between the outlet end of the regeneration device and the inlet end of the first heat exchanger. 6. The air conditioner according to claim 3, wherein a third heat exchanger is arranged on the exhaust pipeline of the compressor, and the third heat exchanger is configured when the solution circulation system is in the dehumidification mode , for exchanging heat between the dehumidification solution and exhaust gas, and for exchanging heat between the regeneration solution and exhaust gas when the solution circulation system is in humidification mode. 7. The air conditioner according to claim 6, characterized in that, a solution cooler is also arranged between the regeneration device and the outdoor heat exchanger, and the first end of the solution cooler is connected to the dehumidification solution The pipeline is selectively communicated, and the second end of the solution cooler is selectively communicated with the dehumidification solution pipeline at the inlet end of the regeneration device. 8. The air conditioner according to claim 7, characterized in that a first regulating pipeline is connected between the inlet end of the first heat exchanger and the inlet end of the third heat exchanger, and the A second adjustment pipeline is connected between the inlet end of the third heat exchanger and the dehumidification solution pipeline passing through the second heat exchanger, the first end of the first adjustment pipeline and the first The inlet port of the heat exchanger is selectively connected with the outlet port of the second heat exchanger, and the first end of the second regulating pipeline and the second end of the solution cooler are selectively connected with the dehumidifier The solution pipeline is connected, and the second end of the first adjustment pipeline and the second end of the second adjustment pipeline are selectively communicated with the inlet end of the third heat exchanger. 9. The air conditioner according to claim 8, wherein a third regulating pipeline is connected between the inlet end of the dehumidification device and the outlet end of the third heat exchanger, and the third regulating pipe The first end of the pipeline and the inlet end of the regeneration device are selectively communicated with the outlet end of the third heat exchanger, and the second end of the third regulating pipeline is connected with the outlet end of the first heat exchanger port optionally communicates with the inlet port of the dehumidification device.