Air conditioner capable of achieving efficient heat dehumidification

Abstract

The embodiment of the invention provides an air conditioner capable of efficiently performing heat dehumidification, an evaporator is placed in an indoor end, a heat recovery condenser and a first fan are further arranged in the indoor end, and the first fan drives airflow to sequentially pass through the evaporator and the heat recovery condenser; the compressor outputs a refrigerant; the input end of the three-way valve is connected with the output end of the compressor; a refrigerant flows to the throttling device through the single-channel structure or the double-channel structure via the three-way valve, enters the evaporator after passing through the throttling device, and returns to the compressor after passing through the evaporator. The heat recovery condenser is additionally arranged at the indoor end, the efficient heat dehumidification effect is achieved, a high-temperature refrigerant discharged by the compressor exchanges heat with low-temperature cold air passing through the evaporator through the heat recovery condenser, efficient dehumidification can be achieved due to the large temperature difference, the indoor cold air can be rapidly heated during dehumidification, and the dehumidification efficiency is improved. And meanwhile, the high-temperature refrigerant is rapidly cooled in the heat recovery condenser.

Description

Technical Field

[0001] The present invention belongs to the technical field of air conditioning equipment, and particularly relates to an air conditioner capable of efficiently thermally dehumidifying. Background Art

[0002] Currently, household and commercial air conditioners are usually divided into single-cooling and cooling-and-heating types, both of which are composed of four major components (condenser, evaporator, compressor, and throttling device). During the refrigeration operation, they can cool and dehumidify the indoor environment, but there are the following two problems:

[0003] 1. When the existing air conditioner is in the dehumidification mode, the whole machine cannot achieve heat recovery, the power of the whole machine is relatively high, and the dehumidification energy efficiency is low;

[0004] 2. The air conditioner can only perform cold dehumidification and cannot be used in low-temperature and high-humidity scenarios, so the application scenarios are limited.

[0005] Many application scenarios of dehumidification are in a state of low temperature and high humidity (such as the south's returning dampness day, where the environmental temperature is relatively low but the humidity is very high). In the dehumidification mode of a conventional air conditioner in a low-temperature scenario, the outlet air temperature is very low, which makes the indoor temperature lower and lower; moreover, the control equipment for realizing the dehumidification function is complex and the manufacturing cost is high.

[0006] For example, in the patent CN1119261A, the indoor reheating heat exchanger is used as an evaporator during refrigeration and as a condenser during heating, and the control is complex and not easy to implement. Summary of the Invention

[0007] In view of the above problems existing in the prior art, the purpose of the embodiments of the present invention is to provide an air conditioner capable of efficiently thermally dehumidifying.

[0008] The technical solution adopted in the embodiments of the present invention is an air conditioner capable of efficiently thermally dehumidifying, which includes a refrigeration condenser, an evaporator, a compressor, and a throttling device. It is characterized in that it is constructed with an indoor end and an outdoor end. The evaporator is placed inside the indoor end, and a heat recovery condenser and a first fan are also arranged inside the indoor end. The first fan drives the air flow to pass through the evaporator and the heat recovery condenser in sequence;

[0009] The compressor outputs refrigerant;

[0010] It further includes a three-way valve, and the input end of the three-way valve is connected to the output end of the compressor; the refrigerant flows through the three-way valve to the throttling device through a single-channel structure or a double-channel structure. After passing through the throttling device, the refrigerant enters the evaporator, and after passing through the evaporator, the refrigerant returns to the compressor; wherein:

[0011] The single-channel structure is configured as: the output end of the refrigeration condenser or the output end of the heat recovery condenser is connected to the throttling device;

[0012] The dual-channel structure is configured such that the output ends of the refrigeration condenser and the heat recovery condenser are both connected to the throttling device. By adding a heat recovery condenser at the indoor end, an efficient heat dehumidification effect is achieved: the high-temperature refrigerant discharged by the compressor exchanges heat with the low-temperature cold air passing through the evaporator in the heat recovery condenser. Due to the large temperature difference, efficient dehumidification can be realized, and the cold air indoors can be quickly heated up during dehumidification. At the same time, the high-temperature refrigerant is quickly cooled down in the heat recovery condenser.

[0013] Further, one output end of the three-way valve is communicated with the input end of the heat recovery condenser, the output end of the heat recovery condenser is communicated with the input end of the refrigeration condenser, and the output end of the refrigeration condenser is connected to the input end of the throttling device, so that the refrigerant flows to the throttling device in a single-channel manner through the three-way valve. In this way, the refrigerant flowing through the heat recovery condenser will pass through the refrigeration condenser again, enabling heat recovery for dehumidification.

[0014] Further, one output end of the three-way valve is communicated with the input end of the refrigeration condenser, the output end of the refrigeration condenser is communicated with the input end of the heat recovery condenser, and the output end of the heat recovery condenser is connected to the input end of the throttling device, so that the refrigerant flows to the throttling device in a single-channel manner through the three-way valve. In this way, the refrigerant flowing through the refrigeration condenser will pass through the heat recovery condenser again, enabling heat recovery for dehumidification.

[0015] Further, the output ends of the three-way valve are respectively connected to the input ends of the heat recovery condenser and the refrigeration condenser in a switchable manner. By controlling the opening and closing of the two output ends of the three-way valve, it is possible to control whether the refrigerant passes through the heat recovery condenser and the refrigeration condenser, and thus the dehumidification function can be controlled through the three-way valve. By controlling whether the refrigerant passes through the heat recovery condenser through the three-way valve to control whether the dehumidification function is enabled, when the refrigerant passes through the heat recovery condenser, the dehumidification function is enabled; conversely, when the refrigerant does not pass through the heat recovery condenser, the dehumidification function is not enabled. The control of the dehumidification function is simple.

[0016] Further, the structure between the heat recovery condenser and the refrigeration condenser is configured to be a switchable communication structure.

[0017] Further, the output end of the heat recovery condenser is connected to the input end of the refrigeration condenser, and the output end of the refrigeration condenser is connected to the input end of the throttling device, so that the refrigerant flows to the throttling device in a single-channel manner through the three-way valve, including:

[0018] The output end of the three-way valve connected to the heat recovery condenser is opened, and the output end of the three-way valve connected to the refrigeration condenser is closed, so that the refrigerant passes through the heat recovery condenser and the refrigeration condenser in sequence;

[0019] Or,

[0020] The output end of the three-way valve connected to the heat recovery condenser is closed, and the output end of the three-way valve connected to the refrigeration condenser is opened, so that no refrigerant passes through the heat recovery condenser, and the refrigerant only passes through the refrigeration condenser, deactivating the heat recovery condenser and deactivating the dehumidification function;

[0021] Or,

[0022] The output end of the three-way valve connected to the heat recovery condenser is opened, and the output end of the three-way valve connected to the refrigeration condenser is opened, so that refrigerant passes through both the heat recovery condenser and the refrigeration condenser. When refrigerant passes through both the heat recovery condenser and the refrigeration condenser, it is equivalent to having two condensers working, which helps to improve the heat dissipation efficiency. When the heat recovery condenser and the refrigeration condenser are connected in series, the high-temperature refrigerant first releases part of the heat through the heat recovery condenser and then completes heat dissipation through the refrigeration condenser. Therefore, the heat recovery condenser can adopt a miniaturized design to reduce costs.

[0023] Further, the output ends of both the heat recovery condenser and the refrigeration condenser are connected to the input end of the throttling device, so that the refrigerant flows to the throttling device in a dual-channel manner through the three-way valve, including:

[0024] The output ends of the three-way valve connected to the heat recovery condenser and the refrigeration condenser are both opened, so that refrigerant passes through both the heat recovery condenser and the refrigeration condenser; when refrigerant passes through both the heat recovery condenser and the refrigeration condenser, it is equivalent to having two condensers working, which helps to improve the heat dissipation efficiency;

[0025] Or,

[0026] The output end of the three-way valve connected to the heat recovery condenser is opened, and the output end of the three-way valve connected to the refrigeration condenser is closed, so that no refrigerant passes through the refrigeration condenser, and the refrigerant only passes through the heat recovery condenser, and only the heat recovery condenser works for dehumidification, which is suitable for dehumidification operations in the case of low environmental temperature and high humidity;

[0027] Or,

[0028] The output end of the three-way valve connected to the heat recovery condenser is closed, and the output end of the three-way valve connected to the refrigeration condenser is opened, so as to deactivate the heat recovery condenser, so that no refrigerant passes through the heat recovery condenser, and the refrigerant only passes through the refrigeration condenser, deactivating the heat recovery condenser and deactivating the dehumidification function.

[0029] Further, the refrigeration condenser is placed inside the outdoor end, and a second fan is also provided inside the outdoor end, and the second fan blows air towards the refrigeration condenser. The second fan is used to help the refrigeration condenser dissipate heat.

[0030] A condensate collection device is also provided inside the indoor end, and the condensate collection device is placed below the heat recovery condenser to receive the condensate.

[0031] Compared with the prior art, the air conditioner capable of efficient heat dehumidification proposed by the present technical solution realizes the dehumidification function by arranging a heat recovery condenser in the indoor unit, enabling the air flow to pass through the evaporator and the heat recovery condenser in sequence, and can be applied to low-temperature and high-humidity scenarios. The heat recovery condenser arranged in the indoor unit serves as a heat source during dehumidification, which can meet the needs of heat dehumidification during dehumidification operations, and the heat recovery condenser can heat cold air to ensure the indoor air outlet temperature when dehumidifying at low ambient temperatures.

[0032] It should be understood that the foregoing general description and the following detailed description are merely exemplary and explanatory, and are not intended to limit the present invention.

[0033] An overview of various implementations or examples of the technologies described in the present invention is not a full disclosure of the entire scope or all features of the disclosed technologies. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In the drawings, which are not necessarily to scale, the same reference numerals may describe similar components in different views. The same reference numerals with alphabetical suffixes or different alphabetical suffixes may represent different instances of similar components. The drawings generally illustrate various embodiments by way of example and not limitation, and are used together with the description and the claims to explain the embodiments of the invention. Where appropriate, the same reference numerals are used throughout the drawings to refer to the same or similar parts. Such embodiments are illustrative and not intended to be an exhaustive or exclusive embodiment of the apparatus or method.

[0035] Figure 1 It is a schematic diagram of the working state in which refrigerant passes through the heat recovery condenser according to an embodiment of the present invention.

[0036] Figure 2 It is a schematic diagram of the working state in which no refrigerant passes through the heat recovery condenser according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0037] In order to make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the drawings of the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the described embodiments of the present invention without creative efforts shall fall within the scope of protection of the present invention.

[0038] Unless otherwise defined, the technical terms or scientific terms used in the present invention shall have the ordinary meanings as understood by those of ordinary skill in the art to which the present invention pertains. The terms "first", "second" and similar terms used in the present invention do not denote any order, quantity or importance, but are only used to distinguish different components. Words such as "comprising" or "including" mean that the elements or items appearing before such a word cover the elements or items listed after such a word and their equivalents, without excluding other elements or items. Words such as "connected" or "coupled" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. Words such as "upper", "lower", "left" and "right" are only used to indicate relative positional relationships, and when the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0039] To keep the following description of the embodiments of the present invention clear and concise, detailed descriptions of known functions and known components are omitted in the present invention.

[0040] Referring to Figures 1 to 2 , an embodiment of the present invention provides an air conditioner capable of efficient heat dehumidification, which includes a refrigeration condenser 1, an evaporator 2, a compressor 3 and a throttling device 4. The feature is that it is constructed with an indoor end and an outdoor end, the evaporator 2 is placed inside the indoor end, and a heat recovery condenser 5 and a first fan 6 are also arranged inside the indoor end. The first fan 6 drives the air flow to pass through the evaporator 2 and the heat recovery condenser 5 in sequence;

[0041] The compressor 3 outputs refrigerant.

[0042] It further includes a three-way valve 7, and the input end of the three-way valve 7 is connected to the output end of the compressor 3; the refrigerant flows to the throttling device 4 through a single-channel structure or a double-channel structure via the three-way valve 7. After passing through the throttling device 4, the refrigerant enters the evaporator 2, and after passing through the evaporator 2, the refrigerant returns to the compressor 3; wherein:

[0043] The single-channel structure is constructed such that the output end of the refrigeration condenser 1 or the output end of the heat recovery condenser 5 is connected to the throttling device 4;

[0044] The dual-channel structure is configured such that the output ends of the refrigeration condenser 1 and the heat recovery condenser 5 are both connected to the throttling device 4. In this technical solution, by arranging the heat recovery condenser 5 inside the indoor unit, the air flow passes through the evaporator 2 and the heat recovery condenser 5 in sequence to achieve the dehumidification function, and it can be applied to low-temperature and high-humidity scenarios. The heat recovery condenser 5 arranged inside the indoor unit serves as a heat source during dehumidification, which can meet the need for heat dehumidification during the dehumidification operation, and the heat recovery condenser 5 can heat the cold air, ensuring the indoor air outlet temperature when dehumidifying at low ambient temperatures. By adding the heat recovery condenser 5 to the indoor unit, an efficient heat dehumidification effect is achieved: the high-temperature refrigerant discharged from the compressor exchanges heat with the low-temperature cold air passing through the evaporator through the heat recovery condenser 5. Due to the large temperature difference, efficient dehumidification can be realized, and the cold air indoors can be quickly heated during dehumidification, while the high-temperature refrigerant is quickly cooled in the heat recovery condenser 5.

[0045] In some embodiments, one output end of the three-way valve 7 is communicated with the input end of the heat recovery condenser 5, the output end of the heat recovery condenser 5 is communicated with the input end of the refrigeration condenser 1, and the output end of the refrigeration condenser 1 is connected to the input end of the throttling device 4, so that the refrigerant flows to the throttling device 4 in a single-channel manner through the three-way valve 7. In this way, the refrigerant flowing through the heat recovery condenser 5 will pass through the refrigeration condenser 1 again, and heat recovery can be achieved through the heat recovery condenser 5 for dehumidification.

[0046] In some embodiments, one output end of the three-way valve 7 is communicated with the input end of the refrigeration condenser 1, the output end of the refrigeration condenser 1 is communicated with the input end of the heat recovery condenser 5, and the output end of the heat recovery condenser 5 is connected to the input end of the throttling device 4, so that the refrigerant flows to the throttling device 4 in a single-channel manner through the three-way valve 7. In this way, the refrigerant flowing through the refrigeration condenser 1 will pass through the heat recovery condenser 5 again, and heat recovery can be achieved through the heat recovery condenser 5 for dehumidification.

[0047] In some embodiments, the output end of the three-way valve 7 is respectively connected to the input ends of the heat recovery condenser 5 and the refrigeration condenser 1 in a switchable manner. By controlling the opening and closing of the two output ends of the three-way valve 7, it is possible to control whether the refrigerant passes through the heat recovery condenser 5 and the refrigeration condenser 1, that is, the dehumidification function can be controlled through the three-way valve 7. By controlling whether the refrigerant passes through the heat recovery condenser 5 through the three-way valve 7 to control whether the dehumidification function is enabled, when the refrigerant passes through the heat recovery condenser 5, the dehumidification function is enabled; on the contrary, when the refrigerant does not pass through the heat recovery condenser 5, the dehumidification function is not enabled. The control of the dehumidification function is simple.

[0048] In some embodiments, the structure between the heat recovery condenser 5 and the refrigeration condenser 1 is configured as a switchable communication structure.

[0049] In some embodiments, the output end of the heat recovery condenser 5 is connected to the input end of the refrigeration condenser 1, and the output end of the refrigeration condenser 1 is connected to the input end of the throttling device 4, so that the refrigerant flows to the throttling device 4 in a single-channel manner through the three-way valve 7, including:

[0050] The three-way valve 7 connecting the output end of the heat recovery condenser 5 is opened, and the three-way valve 7 connecting the output end of the refrigeration condenser 1 is closed, so that the refrigerant passes through the heat recovery condenser 5 and the refrigeration condenser 1 in sequence;

[0051] Or,

[0052] The three-way valve 7 connecting the output end of the heat recovery condenser 5 is closed, and the three-way valve 7 connecting the output end of the refrigeration condenser 1 is opened, so that no refrigerant passes through the heat recovery condenser 5, and the refrigerant only passes through the refrigeration condenser 1, deactivating the heat recovery condenser and deactivating the dehumidification function;

[0053] Or,

[0054] The three-way valve 7 connecting the output end of the heat recovery condenser 5 is opened, and the three-way valve 7 connecting the output end of the refrigeration condenser 1 is opened, so that both the heat recovery condenser 5 and the refrigeration condenser 1 have refrigerant passing through. When there is refrigerant passing through both the heat recovery condenser 5 and the refrigeration condenser 1, it is equivalent to having two condensers working, which helps to improve the heat dissipation efficiency. In this connection mode of the heat recovery condenser 5 and the refrigeration condenser 1, when the heat recovery condenser 5 and the refrigeration condenser 1 are connected in series, the high-temperature refrigerant first releases part of the heat through the heat recovery condenser 5 and then completes heat dissipation through the refrigeration condenser 1. Therefore, the heat recovery condenser 5 can adopt a miniaturized design to reduce costs.

[0055] In some embodiments, the output ends of both the heat recovery condenser 5 and the refrigeration condenser 1 are connected to the input end of the throttling device 4, so that the refrigerant flows to the throttling device 4 in a double-channel manner through the three-way valve 7, including:

[0056] The three-way valve 7 connecting the output ends of both the heat recovery condenser 5 and the refrigeration condenser 1 is opened, so that both the heat recovery condenser 5 and the refrigeration condenser 1 have refrigerant passing through; when there is refrigerant passing through both the heat recovery condenser 5 and the refrigeration condenser 1, it is equivalent to having two condensers working, which helps to improve the heat dissipation efficiency;

[0057] Or,

[0058] The three-way valve 7 connecting the output end of the heat recovery condenser 5 is opened, and the three-way valve 7 connecting the output end of the refrigeration condenser 1 is closed, so that no refrigerant passes through the refrigeration condenser 1, and the refrigerant only passes through the heat recovery condenser 5, and only the heat recovery condenser 5 works for dehumidification, which is suitable for dehumidification operations in the case of low ambient temperature and high humidity;

[0059] Or,

[0060] The output end connection of the three-way valve 7 to the heat recovery condenser 5 is closed, and the output end connection of the three-way valve 7 to the refrigeration condenser 1 is opened to deactivate the heat recovery condenser 5, so that no refrigerant passes through the heat recovery condenser 5, and the refrigerant only passes through the refrigeration condenser 1. When the heat recovery condenser 5 is deactivated, the dehumidification function is deactivated.

[0061] In some embodiments, the refrigeration condenser 1 is placed inside the outdoor end, and a second fan 8 is further provided inside the outdoor end. The second fan 8 blows air towards the refrigeration condenser 1. The second fan 8 is used to help the refrigeration condenser 1 dissipate heat.

[0062] A condensate collection device 9 is further provided inside the indoor end. The condensate collection device 9 is placed below the heat recovery condenser 5 to receive condensate. The condensate collection device 9 can be implemented by means such as a water tank connected to a drainage pipe.

[0063] The above description is intended to be illustrative rather than restrictive, and those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present disclosure. Moreover, the above examples (or one or more of their solutions) can be used in combination with each other, and considering these embodiments, they can be combined with each other in various combinations or arrangements.

Claims

1. An air conditioner capable of efficient heat dehumidification, comprising a refrigeration condenser (1), an evaporator (2), a compressor (3) and a throttling device (4), characterized in that, The structure has an indoor end and an outdoor end. The evaporator (2) is placed inside the indoor end. A heat recovery condenser (5) and a first fan (6) are also arranged inside the indoor end. The first fan (6) drives the air flow to pass through the evaporator (2) and the heat recovery condenser (5) in sequence; The compressor (3) outputs refrigerant; It further includes a three-way valve (7). The input end of the three-way valve (7) is connected to the output end of the compressor (3); The refrigerant flows to the throttling device (4) through a single-channel structure or a double-channel structure via the three-way valve (7). After passing through the throttling device (4), the refrigerant enters the evaporator (2), and after passing through the evaporator (2), the refrigerant returns to the compressor (3); Wherein: The single-channel structure is configured as: the output end of the refrigeration condenser (1) or the output end of the heat recovery condenser (5) is connected to the throttling device (4); The double-channel structure is configured as: the output ends of the refrigeration condenser (1) and the heat recovery condenser (5) are both connected to the throttling device (4).

2. The air conditioner capable of efficiently dehumidifying by heat according to claim 1, wherein, One output end of the three-way valve (7) is communicated with the input end of the heat recovery condenser (5). The output end of the heat recovery condenser (5) is communicated with the input end of the refrigeration condenser (1). The output end of the refrigeration condenser (1) is connected to the input end of the throttling device (4), so that the refrigerant flows to the throttling device (4) through a single-channel mode via the three-way valve (7).

3. The air conditioner capable of highly efficient heat dehumidification according to claim 1, wherein One output end of the three-way valve (7) is communicated with the input end of the refrigeration condenser (1). The output end of the refrigeration condenser (1) is communicated with the input end of the heat recovery condenser (5). The output end of the heat recovery condenser (5) is connected to the input end of the throttling device (4), so that the refrigerant flows to the throttling device (4) through a single-channel mode via the three-way valve (7).

4. An air conditioner capable of efficient thermal dehumidification according to claim 1, characterized in that, The output end of the three-way valve (7) is respectively connected to the input ends of the heat recovery condenser (5) and the refrigeration condenser (1) in a switchable manner.

5. The air conditioner capable of highly efficient heat dehumidification according to claim 1, characterized in that, The structure between the heat recovery condenser (5) and the refrigeration condenser (1) is configured as a switchable communication structure.

6. The air conditioner capable of highly efficient heat dehumidification according to claim 4, characterized in that, The output end of the heat recovery condenser (5) is connected to the input end of the refrigeration condenser (1). The output end of the refrigeration condenser (1) is connected to the input end of the throttling device (4), so that the refrigerant flows to the throttling device (4) through a single-channel mode via the three-way valve (7), including: The output end of the three-way valve (7) connecting the heat recovery condenser (5) is opened, and the output end of the three-way valve (7) connecting the refrigeration condenser (1) is closed, so that the refrigerant passes through the heat recovery condenser (5) and the refrigeration condenser (1) in sequence; Or, The output end of the three-way valve (7) connecting the heat recovery condenser (5) is closed, and the output end of the three-way valve (7) connecting the refrigeration condenser (1) is opened, so that no refrigerant passes through the heat recovery condenser (5), and the refrigerant only passes through the refrigeration condenser (1); Or, The output end of the three-way valve (7) connecting the heat recovery condenser (5) is opened, and the output end of the three-way valve (7) connecting the refrigeration condenser (1) is opened, so that refrigerant passes through both the heat recovery condenser (5) and the refrigeration condenser (1).

7. An air conditioner capable of efficient heat dehumidification according to claim 4, characterized in that, The output ends of the heat recovery condenser (5) and the refrigeration condenser (1) are both connected to the input end of the throttling device (4), such that the refrigerant flows to the throttling device (4) in a dual-channel manner through the three-way valve (7), including: The output ends of the three-way valve (7) connected to the heat recovery condenser (5) and the refrigeration condenser (1) are both opened, so that refrigerant passes through both the heat recovery condenser (5) and the refrigeration condenser (1); Or, The output end of the three-way valve (7) connected to the heat recovery condenser (5) is opened, and the output end of the three-way valve (7) connected to the refrigeration condenser (1) is closed, so that no refrigerant passes through the refrigeration condenser (1), and the refrigerant only passes through the heat recovery condenser (5); Or, The output end of the three-way valve (7) connected to the heat recovery condenser (5) is closed, and the output end of the three-way valve (7) connected to the refrigeration condenser (1) is opened, to deactivate the heat recovery condenser (5), so that no refrigerant passes through the heat recovery condenser (5), and the refrigerant only passes through the refrigeration condenser (1).

8. The air conditioner capable of efficient heat dehumidification according to claim 1, characterized in that, The refrigeration condenser (1) is placed inside the outdoor end, and a second fan (8) is further arranged inside the outdoor end, and the second fan (8) blows air towards the refrigeration condenser (1).

9. The air conditioner capable of highly efficient heat dehumidification according to claim 1, wherein A condensate water collection device (9) is further arranged inside the indoor end, and the condensate water collection device (9) is placed below the heat recovery condenser (5) to receive the condensate water.

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