CN117146421A

CN117146421A - Fresh air unit

Info

Publication number: CN117146421A
Application number: CN202311129876.1A
Authority: CN
Inventors: 李贺贺; 何伟光; 徐艳妮; 杨基文; 张智峰
Original assignee: Gree Electric Appliances Inc of Zhuhai
Current assignee: Gree Electric Appliances Inc of Zhuhai
Priority date: 2023-09-01
Filing date: 2023-09-01
Publication date: 2023-12-01

Abstract

The present disclosure relates to a fresh air handling unit, comprising: an exhaust channel (10), two ends of which are respectively provided with an air return inlet (11) and an exhaust outlet (12); the two ends of the fresh air channel (20) are respectively provided with a fresh air inlet (21) and an air supply outlet (22); a horizontal heat pipe exchanger (30) having a first end (31) located within the exhaust air channel (10) and a second end (32) located within the fresh air channel (20); and a heat pump device comprising a compressor (41) forming a heat pump refrigerant circulation circuit, a first heat exchanger (42; 42 '), a first throttling element (43) and a second heat exchanger (44), said first heat exchanger (42; 42') being located in said exhaust channel (10) and said second heat exchanger (44) being located in said fresh air channel (20).

Description

Fresh air unit

Technical Field

The present disclosure relates to air conditioning, and more particularly to a fresh air handling unit.

Background

With the rapid development of society, the requirements of industrial buildings, medical buildings and the like on indoor environments are more strict, so that the operation energy consumption of an air conditioning system is greatly increased. To control carbon emissions and economic development in general, there is a need to further reduce the energy consumption of air conditioning systems.

The traditional air treatment unit only processes the functions of fresh air cooling, dehumidification, heating and the like, and the fresh air system has high energy consumption. In recent years, exhaust heat recovery technology is gradually applied, and various heat recovery technologies are proposed. In some related art fresh air handling unit schemes, the air source heat pump unit is utilized to recover the exhaust heat. The machine case of air heat recovery heat pump comprises mutually independent new trend passageway and passageway of airing exhaust, and heat pump device comprises compressor, cross valve, the heat exchanger that is located new trend passageway, throttling arrangement and the heat exchanger that is located the passageway of airing exhaust pass through the refrigerant pipeline and connect in proper order, utilizes heat recovery device and heat pump device's combination, will indoor heat transfer of airing exhaust to the new trend to realize the heat recovery of airing exhaust, be favorable to improving energy-conserving effect. The heat recovery device can be in the forms of a split gravity heat pipe, a split liquid pump circulating heat recovery device, an integral heat pipe and the like.

Disclosure of Invention

The inventor finds that when the heat recovery device in the related technology adopts a separated gravity heat pipe or an integral heat pipe, the problem that the heat recovery efficiency can only ensure the high efficiency in one season when switching in summer and winter exists.

In view of the above, embodiments of the present disclosure provide a fresh air handling unit capable of improving an imbalance condition of heat recovery efficiency.

In one aspect of the present disclosure, there is provided a fresh air handling unit including:

the two ends of the air exhaust channel are respectively provided with an air return inlet and an air exhaust outlet;

the two ends of the fresh air channel are respectively provided with a fresh air inlet and an air supply outlet;

the horizontal heat pipe exchanger is provided with a first end positioned in the exhaust channel and a second end positioned in the fresh air channel; and

the heat pump device comprises a compressor forming a heat pump refrigerant circulation loop, a first heat exchanger, a first throttling element and a second heat exchanger, wherein the first heat exchanger is positioned in the exhaust channel, and the second heat exchanger is positioned in the fresh air channel.

In some embodiments, the core heat transfer component of the horizontal heat pipe heat exchanger is a channel heat pipe.

In some embodiments, at least one of a first end of the horizontal heat pipe heat exchanger located within the exhaust air channel and a second end located within the fresh air channel has an outer fin.

In some embodiments, the air exhaust channel and the fresh air channel are disposed at the same height.

In some embodiments, the air exhaust channel and the fresh air channel are separated by a partition and are not in communication with each other.

In some embodiments, the fresh air handling unit further comprises:

the spraying device is arranged in the exhaust channel.

In some embodiments, the fresh air handling unit has a first mode of operation and a second mode of operation, and the spray device is configured to turn on the spray when the fresh air handling unit is in the first mode of operation and/or to turn off the spray when the fresh air handling unit is in the second mode of operation.

In some embodiments, the first heat exchanger is located on a side of the first end of the horizontal heat pipe heat exchanger adjacent to the return air inlet, and the spray device is located between the first end of the horizontal heat pipe heat exchanger and the first heat exchanger.

In some embodiments, the first heat exchanger is located on a side of the first end of the horizontal heat pipe heat exchanger adjacent the return air inlet, and the spray device is located on a side of the first heat exchanger remote from the first end of the horizontal heat pipe heat exchanger.

In some embodiments, the first heat exchanger is located on a side of the first end of the horizontal heat pipe heat exchanger adjacent to the exhaust outlet, and the spray device is located on a side of the first end of the horizontal heat pipe heat exchanger remote from the first heat exchanger.

In some embodiments, the first heat exchanger is located on a side of the first end of the horizontal heat pipe heat exchanger adjacent to the exhaust outlet, and the spray device is located between the first end of the horizontal heat pipe heat exchanger and the first heat exchanger.

In some embodiments, the fresh air handling unit further comprises:

the exhaust fan is positioned in the exhaust channel and is positioned at one side of the first end of the horizontal heat pipe heat exchanger adjacent to the exhaust outlet; and

the water retaining piece is positioned in the exhaust channel and between the exhaust fan and the spraying device.

In some embodiments, the heat pump device further comprises a four-way valve arranged in the heat pump refrigerant circulation loop, and the fresh air handling unit has a first operation mode and a second operation mode; the four-way valve is configured to communicate the exhaust port of the compressor with the first heat exchanger and the suction port of the compressor with the second heat exchanger when the fresh air unit is in the first mode of operation; the four-way valve is further configured to communicate the exhaust port of the compressor with the second heat exchanger and the suction port of the compressor with the first heat exchanger when the fresh air unit is in the second mode of operation.

In some embodiments, the heat pump apparatus further comprises a regeneration mechanism forming a regenerated refrigerant flow path, the regeneration mechanism configured to turn on the regenerated refrigerant flow path when the fresh air handling unit is in the first mode of operation to regenerate the air flow through the fresh air channel, and/or to turn off the regenerated refrigerant flow path when the fresh air handling unit is in the second mode of operation.

In some embodiments, the heat regeneration mechanism comprises a third heat exchanger and a second throttling element, wherein the third heat exchanger and the second throttling element are positioned in the fresh air channel, one end of the third heat exchanger is connected to a refrigerant flow path between the first heat exchanger and the four-way valve, and the other end of the third heat exchanger is communicated with the second heat exchanger through the second throttling element.

In some embodiments, the second heat exchanger is located on a side of the second end of the horizontal heat pipe heat exchanger adjacent the supply air outlet, and the third heat exchanger is located on a side of the second heat exchanger remote from the second end of the horizontal heat pipe heat exchanger.

In some embodiments, the fresh air handling unit further comprises:

the fresh air fan is positioned in the fresh air channel and is positioned at one side of the third heat exchanger far away from the second heat exchanger; and

the filter is positioned in the fresh air channel and positioned at one side of the second end of the horizontal heat pipe heat exchanger adjacent to the fresh air inlet.

In some embodiments, the compressor and the four-way valve are disposed within the vent passage or the fresh air passage.

In some embodiments, the first mode of operation is a summer mode of operation and the second mode of operation is a winter mode of operation.

Compared with a fresh air unit adopting a separated gravity heat pipe or an integral heat pipe as a heat recovery device in the related art, the embodiment of the disclosure adopts the horizontal heat pipe heat exchangers with two ends respectively arranged on the exhaust channel and the fresh air channel as the heat recovery device, and can reduce the difference value of heat recovery efficiency of the fresh air unit in different operation modes, thereby effectively improving the unbalanced condition of the heat recovery efficiency of the fresh air unit.

Drawings

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

The disclosure may be more clearly understood from the following detailed description taken in conjunction with the accompanying drawings in which:

FIG. 1 is a schematic diagram of a structure of an embodiment of a fresh air handling unit according to the present disclosure;

FIG. 2 is a schematic diagram of another embodiment of a fresh air handling unit according to the present disclosure;

FIG. 3 is a schematic diagram of a structure of yet another embodiment of a fresh air handling unit according to the present disclosure;

fig. 4 is a schematic structural view of yet another embodiment of a fresh air handling unit according to the present disclosure.

It should be understood that the dimensions of the various elements shown in the figures are not drawn to actual scale. Further, the same or similar reference numerals denote the same or similar members.

Detailed Description

Various exemplary embodiments of the present disclosure will now be described in detail with reference to the accompanying drawings. The description of the exemplary embodiments is merely illustrative, and is in no way intended to limit the disclosure, its application, or uses. The present disclosure may be embodied in many different forms and is not limited to the embodiments described herein. These embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art. It should be noted that: the relative arrangement of parts and steps, the composition of materials, numerical expressions and numerical values set forth in these embodiments should be construed as exemplary only and not limiting unless otherwise specifically stated.

The terms "first," "second," and the like, as used in this disclosure, do not denote any order, quantity, or importance, but rather are used to distinguish one element from another. The word "comprising" or "comprises" and the like means that elements preceding the word encompass the elements recited after the word, and not exclude the possibility of also encompassing other elements. "upper", "lower", "left", "right", etc. are used merely to indicate relative positional relationships, which may also be changed when the absolute position of the object to be described is changed.

In this disclosure, when a particular device is described as being located between a first device and a second device, there may or may not be an intervening device between the particular device and either the first device or the second device. When it is described that a particular device is connected to other devices, the particular device may be directly connected to the other devices without intervening devices, or may be directly connected to the other devices without intervening devices.

All terms (including technical or scientific terms) used in this disclosure have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs, unless specifically defined otherwise. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

Techniques, methods, and apparatus known to one of ordinary skill in the relevant art may not be discussed in detail, but are intended to be part of the specification where appropriate.

In some related art fresh air handling units, the heat recovery device employs separate gravity assisted heat pipes or integral heat pipes, which are typically vertically arranged and achieve unidirectional heat transfer, with the heated section of the heat pipe being located on the underside. For the gravity type heat pipe heat exchanger, working medium in an evaporation section at the lower side is heated and evaporated into gas, and gas working medium in a condensation section at the upper side is cooled into liquid, and the liquid working medium completely flows back to the evaporation section under the action of gravity. Therefore, the air duct of the fresh air handling unit needs to be arranged to circulate cold air above and hot air below. When the indoor and outdoor wind temperatures in winter and summer are different, the heat recovery efficiency is greatly changed due to season conversion, and the problem that the high efficiency can only be ensured in one season is solved.

Fig. 1 is a schematic structural diagram of an embodiment of a fresh air handling unit according to the present disclosure. Referring to fig. 1, an embodiment of the present disclosure provides a fresh air handling unit, including: an exhaust channel 10, a fresh air channel 20, a horizontal heat pipe exchanger 30 and a heat pump device. The two ends of the exhaust channel 10 are respectively provided with an air return inlet 11 and an exhaust outlet 12. Both ends of the fresh air channel 20 are respectively provided with a fresh air inlet 21 and an air supply outlet 22.

For the action area (such as indoor) of the fresh air handling unit, the return air inlet of the air exhaust channel 10 can receive the return air in the action area, and the return air flows to the air exhaust outlet 12 through the air exhaust channel 10 and is exhausted from the air exhaust outlet 12 to the outside of the action area; the fresh air inlet of the fresh air channel 20 is capable of receiving fresh air outside the active area, and the fresh air flows through the fresh air channel 20 to the air supply outlet 22 and is discharged from the air supply outlet 22 into the active area.

The horizontal heat pipe exchanger 30 has a first end 31 located in the exhaust air passage 10 and a second end 32 located in the fresh air passage 20. The two ends of the horizontal heat pipe heat exchanger 30 can be respectively used as an evaporation section and a condensation section to realize heat recovery under different operation modes of the fresh air unit. The heat recovery here may include both heat recovery from the gas stream in the channel and cold recovery from the gas stream in the channel.

The heat pump apparatus includes a compressor 41 forming a heat pump refrigerant circulation circuit, a first heat exchanger 42, a first throttling element 43, and a second heat exchanger 44. The first heat exchanger 42 is located in the exhaust duct 10, and the second heat exchanger 44 is located in the fresh air duct 20. According to the operation condition of the heat pump device, the high-temperature and high-pressure gaseous refrigerant discharged from the exhaust port of the compressor 41 can enter the first heat exchanger 42 or the second heat exchanger 44 serving as a condenser to cool and release heat, then pass through the first throttling unit 43 to perform throttling and depressurization, then enter the second heat exchanger 44 or the first heat exchanger 42 serving as an evaporator to perform evaporation and heat absorption, and then return to the air suction port of the compressor 41.

The first throttling element 43 may employ a capillary tube, a thermal expansion valve, an electronic expansion valve, or the like. The first heat exchanger 42 may be a shell and tube heat exchanger, or may be another type of heat exchanger, such as a tube and fin heat exchanger. The second heat exchanger 44 may be a tube and fin heat exchanger, or may be another type of heat exchanger.

In the gravity type heat pipe heat exchanger of the related art, after the gaseous working medium in the upper condensation section is exothermically condensed into the liquid working medium, the liquid working medium flows back to the evaporation section by the action of gravity and a pipe core. That is, the gravity type heat pipe heat exchanger has heat released from the upper end and heat absorbed from the lower end, and belongs to unidirectional heat transfer. It is therefore necessary to arrange the air duct of the fresh air handling unit so as to circulate cold air above and hot air below. If hot air flows through the upper part and cold air flows through the lower part, liquid working medium condensed below in the gravity type heat pipe heat exchanger is difficult to flow back upwards through the pipe core under the action of gravity, so that the heat recovery efficiency is greatly changed when the gravity type heat pipe heat exchanger is used in different seasons, the heat recovery with higher efficiency can be realized only in one season, and the efficiency is lower in other seasons.

In contrast, in the running process of the horizontal heat pipe heat exchanger, the two ends of the horizontal heat pipe heat exchanger can adjust the heat transfer direction according to the temperature relation of the air duct, and the horizontal heat pipe heat exchanger belongs to a structure capable of conducting heat in two directions. At one end (serving as an evaporation section) of the horizontal heat pipe heat exchanger in the air duct with higher temperature, the working medium in the heat pipe absorbs heat and evaporates, the gaseous working medium obtained by evaporation flows to one end (serving as a condensation section) of the horizontal heat pipe heat exchanger in the air duct with lower temperature under the action of pressure difference, and releases heat to condense into a liquid working medium, and the liquid working medium flows back to one end of the horizontal heat pipe heat exchanger in the air duct with higher temperature under the capillary action of the pipe core. Because the heights of the two ends of the horizontal heat pipe heat exchanger are the same or basically the same, the liquid working medium does not need to overcome the influence of gravity under the capillary action of the pipe core from the first end to the second end or from the second end to the first end, so that stable heat recovery efficiency can be maintained in different operation modes (such as different seasons) of the fresh air handling unit, and the adaptability to different operation conditions of the heat pump device is improved.

For example, in the summer operation mode, the cold energy of the air flow of the air exhaust channel can be recovered by the first end of the horizontal heat pipe heat exchanger, and the precooling effect of the air flow in the fresh air channel is realized by the second end of the horizontal heat pipe heat exchanger. And in the winter operation mode, the heat of the air flow of the air exhaust channel can be recovered by the first end of the horizontal heat pipe heat exchanger, and the air flow preheating function in the fresh air channel is realized through the second end of the horizontal heat pipe heat exchanger.

The horizontal heat pipe heat exchanger can reduce the difference value of heat recovery efficiency of the fresh air unit in different operation modes of the fresh air unit, thereby effectively improving the unbalanced condition of the heat recovery efficiency of the fresh air unit.

The horizontal heat pipe heat exchanger can transfer heat through the phase change circulation of an internal working medium (refrigerant), and is not required to be driven by driving elements such as a liquid pump, so that the unpowered heat recovery function can be realized, and the running energy consumption of a unit is reduced.

The heights of the first end 31 and the second end 32 of the horizontal heat pipe heat exchanger 30 may be set to be the same, which includes cases where there is an allowable installation inclination error range of the horizontal heat pipe heat exchanger 30. Accordingly, the exhaust duct 10 and the fresh air duct 20 may be disposed at the same height. This facilitates a horizontal arrangement of the first and second ends 31, 32 of the horizontal heat pipe heat exchanger 30, and also facilitates a reduction in the space occupation of the fresh air handling unit in height by arranging the exhaust duct 10 and the fresh air duct 20 at the same height.

In some embodiments, the die of the horizontal heat pipe heat exchanger 30 is a channel type die. The channel type tube core is in a channel type, the capillary pressure head is smaller, and the flow resistance is smaller, so that liquid working medium smoothly flows back from the first end to the second end or smoothly flows back from the second end to the first end under the capillary action of the tube core, and the high axial heat transfer capacity in the two directions is realized. In addition, the radial thermal resistance is smaller, the process repeatability is good, the accurate geometric parameters can be obtained, and the capillary limit can be controlled more accurately. In other embodiments, the horizontal heat pipe heat exchanger 30 may also employ other types of dies, such as wire mesh dies, sintered dies, and the like.

To increase heat exchange efficiency, referring to FIG. 1, in some embodiments, at least one of a first end 31 of the horizontal heat pipe heat exchanger 30 located within the exhaust air channel 10 and a second end 32 located within the fresh air channel 20 has external fins. For example, in fig. 1, one or more outer fins 311 may be provided on the first end 31 and one or more outer fins 321 may be provided on the second end 32. The outer fins increase the heat exchange area, which is beneficial to improving the heat exchange efficiency of the horizontal heat pipe heat exchanger 30.

In some embodiments, the exhaust duct 10 and the fresh air duct 20 may be provided separately without communicating with each other. Referring to fig. 1, in some embodiments, the exhaust duct 10 and the fresh air duct 20 are separated by a partition BA and are not in communication with each other. The horizontal type heat pipe exchanger 30 is thus passed through the mounting hole of the partition BA so that one portion is located at one side of the partition BA and the other portion is located at the other side of the partition BA. Thus, the installation of the horizontal heat pipe exchanger 30 and the division of the air exhaust channel 10 and the fresh air channel 20 are convenient, and the return air in the air exhaust channel 10 and the fresh air in the fresh air channel 20 can be prevented from being mixed with each other, so that cross contamination is avoided.

Referring to FIG. 1, in some embodiments, the fresh air handling unit further includes a shower 50 disposed within the exhaust duct 10. The spraying device 50 can spray the air flowing in the exhaust passage 10, and the sprayed water is directly contacted with the air flow to cool and humidify the air. Due to the evaporation of water, the sensible heat of the air is continuously transferred to the water to cool, the sensible heat of the air is converted into latent heat, the air is cooled, and the moisture content is increased. Therefore, the heat exchange efficiency of the exhaust side of the fresh air unit is improved through direct evaporative cooling, so that the requirement on the heat exchange area of the heat pump heat exchanger can be reduced under the condition of the same air quantity, the size of the fresh air unit is reduced, and the working performance of the heat pump device is improved.

In some embodiments, the fresh air handling unit has a first mode of operation and a second mode of operation. The spray device 50 may turn on spraying when the fresh air handling unit is in the first mode of operation. The spray device 50 may also turn off the spray when the fresh air handling unit is in the second mode of operation. Therefore, under different running modes of the fresh air handling unit, the spraying function of the spraying device can be correspondingly started or closed so as to switch direct evaporative cooling according to the requirement.

The first operation mode and the second operation mode can be a summer operation mode and a winter operation mode respectively, and accordingly, the fresh air handling unit is enabled to start spraying in the summer operation mode and is enabled to be enabled to close spraying in the winter operation mode. Therefore, when the fresh air unit is used in summer, the heat exchange efficiency of the exhaust side is effectively improved through spraying of the spraying device, and the spraying device is closed in a winter running mode so as not to influence heat recovery of an exhaust channel. In other embodiments, the first and second modes of operation are not limited to being divided by season, but may be divided according to other conditions (e.g., ambient temperature, etc.).

In fig. 1, the first heat exchanger 42 may be located at a side of the first end 31 of the horizontal heat pipe heat exchanger 30 adjacent to the return air inlet 11, and the shower device 50 may be located between the first end 31 of the horizontal heat pipe heat exchanger 30 and the first heat exchanger 42. The arrangement of the first heat exchanger 42 upstream of the first end 31 in the exhaust direction can reduce the influence of the horizontal heat pipe heat exchanger 30, which plays a role in heat recovery, on the performance of the first heat exchanger 42 as a condenser, and helps to maintain the refrigerating performance of the heat pump device on the fresh air channel. The water sprayed from the spraying device 42 between the first end 31 and the first heat exchanger 42 can be sprayed on the surface of the first heat exchanger 42 to reduce the heat exchange load of the first heat exchanger 42 as a condenser, and sprayed on the first end 31 to improve the heat exchange efficiency of the exhaust side.

Fig. 2 is a schematic structural view of another embodiment of a fresh air handling unit according to the present disclosure. In comparison with the embodiment shown in fig. 1, in the embodiment of fig. 2, the first heat exchanger is still located on the side of the first end 31 of the horizontal heat pipe heat exchanger 30 adjacent to the return air inlet 11, and the first heat exchanger 42 is disposed upstream of the first end 31 in the air exhaust direction, so that the influence of the horizontal heat pipe heat exchanger 30 acting as heat recovery on the performance of the first heat exchanger 42 as a condenser can be reduced, which helps to maintain the refrigeration performance of the heat pump device on the fresh air channel. The first heat exchanger 42' may be a tube and fin heat exchanger. The spray device 50 is located on a side of the first heat exchanger 42' remote from the first end 31 of the horizontal heat pipe heat exchanger 30. The water sprayed from the spraying device 42 on the side of the first heat exchanger 42 away from the first end 31 can be sprayed on the surface of the first heat exchanger 42 to reduce the heat exchange load of the first heat exchanger 42 serving as a condenser.

Fig. 3 is a schematic structural view of yet another embodiment of a fresh air handling unit according to the present disclosure. In contrast to the embodiment of fig. 2, in the embodiment of fig. 3, the first heat exchanger 42 'is located on a side of the first end 31 of the horizontal heat pipe heat exchanger 30 adjacent to the exhaust air outlet 12, and the shower device 50 is located on a side of the first end 31 of the horizontal heat pipe heat exchanger 30 remote from the first heat exchanger 42'. The first end 31 is disposed upstream of the first heat exchanger 42 in the exhaust direction, so that the first end 31 of the horizontal heat pipe heat exchanger 30 can recover heat of the air flow with higher temperature entering the return air inlet, thereby further improving the heat recovery efficiency. Moreover, water sprayed from the spraying device 42 at the side of the first end 31 far from the first heat exchanger 42 can be sprayed on the first end 31 to improve the heat exchange efficiency at the exhaust side.

Fig. 4 is a schematic structural view of yet another embodiment of a fresh air handling unit according to the present disclosure. In comparison with the embodiment shown in fig. 3, in the embodiment of fig. 4, the first heat exchanger 42' is still located at a side of the first end 31 of the horizontal heat pipe heat exchanger 30 adjacent to the air exhaust outlet 12, and the first end 31 is disposed upstream of the first heat exchanger 42 in the air exhaust direction, so that the heat of the air flow with higher temperature entering the air return inlet can be recovered by the first end 31 of the horizontal heat pipe heat exchanger 30, thereby further improving the heat recovery efficiency. The spray device 50 is located between the first end 31 of the horizontal heat pipe heat exchanger 30 and the first heat exchanger 42'. The water sprayed from the spraying device 42 between the first end 31 and the first heat exchanger 42 can be sprayed on the surface of the first heat exchanger 42 to reduce the heat exchange load of the first heat exchanger 42 serving as a condenser, and sprayed on the first end 31 to improve the heat exchange efficiency of the exhaust side.

Referring to fig. 1-4, in some embodiments, the fresh air handling unit further includes: an exhaust fan 61 and a water deflector 62 are located in the exhaust passage 10. An exhaust fan 61 is located at a side of the first end 31 of the horizontal heat pipe exchanger 30 adjacent to the exhaust outlet 12. A water deflector 62 is located between the exhaust fan 61 and the shower device 50. The return air is driven by the air exhaust fan 61 to flow from the return air inlet 11 to the air exhaust outlet 12, and water sprayed by the spray device 50 positioned upstream is blocked by the water blocking piece 62, so that the water cannot enter the air exhaust fan 61 to cause the failure of the air exhaust fan 61.

In the above embodiments, in order to achieve switching of cooling/heating of the heat pump apparatus, referring to fig. 1 to 4, in some embodiments, the heat pump apparatus further includes a four-way valve 45 disposed in the heat pump refrigerant circulation circuit, and the fresh air handling unit has a first operation mode and a second operation mode.

The four-way valve 45 is configured to communicate the discharge port of the compressor 41 with the first heat exchanger 42 (or 42') and to communicate the suction port of the compressor 41 with the second heat exchanger 44 when the fresh air handling unit is in the first operation mode (e.g., summer operation mode). At this time, the heat pump device cools the fresh air in the fresh air duct 20 by the second heat exchanger 44 so as to inject cool fresh air into an operation area (e.g., room) of the fresh air handling unit.

The four-way valve 45 is further configured to communicate the discharge port of the compressor 41 with the second heat exchanger 44 and the suction port of the compressor 41 with the first heat exchanger 42 (or 42') when the fresh air handling unit is in the second operation mode (e.g., winter operation mode). At this time, the heat pump device heats the fresh air in the fresh air duct 20 by the second heat exchanger 44 so as to inject warm fresh air into the action area (e.g., room) of the fresh air handling unit.

Considering that the fresh air channel may have a possibility of excessively cooling and dehumidifying the second heat exchanger 44 in the first operation mode, referring to fig. 1-4, in some embodiments, the heat pump apparatus further includes a heat recovery mechanism that forms a heat recovery refrigerant flow path. The heat regeneration mechanism may enable the heat regeneration refrigerant flow path to be conducted when the fresh air handling unit is in the first operation mode, so as to regenerate the air flow passing through the fresh air channel 20. Through the backheating effect to the air current, can save to set up extra heating device in the new trend passageway and adjust the air supply temperature to be favorable to improving the regulation precision of new trend humiture, and reduce the energy consumption.

The heat regeneration mechanism can also enable the heat regeneration refrigerant flow path to be closed when the fresh air handling unit is in the second operation mode, so that the heating effect of the heat pump device is not affected in the second operation mode.

Referring to fig. 1-4, in some embodiments, the regeneration mechanism includes a third heat exchanger 46 and a second throttling element 47 positioned within the fresh air channel 20. The third heat exchanger 46 may be a tube-fin heat exchanger, or may be another type of heat exchanger. The second throttling element 47 may be a capillary tube, a thermal expansion valve, an electronic expansion valve, or the like.

One end of the third heat exchanger 46 is connected to a refrigerant flow path between the first heat exchanger 42 (or 42') and the four-way valve 45, and the other end of the third heat exchanger 46 communicates with the second heat exchanger 44 via the second throttling element 47. When the second throttling element 47 is opened, the return air refrigerant flow passage of the heat recovery mechanism can be conducted, and when the second throttling element 47 is closed, the return air refrigerant flow passage of the heat recovery mechanism can be closed.

In fig. 1-4, the second heat exchanger 44 may be located on a side of the second end 32 of the horizontal heat pipe heat exchanger 30 adjacent to the supply air outlet 22, and the third heat exchanger 46 may be located on a side of the second heat exchanger 44 remote from the second end 32 of the horizontal heat pipe heat exchanger 30. Thus, the fresh air can pass through the second heat exchanger 44 and then pass through the third heat exchanger 46, so that in the first operation mode, the fresh air is cooled and dehumidified through the second heat exchanger 44, and then is reheated and temperature and humidity adjusted through the third heat exchanger.

To improve the quality of the fresh air, referring to fig. 1-4, in some embodiments, the fresh air unit further includes a fresh air blower 71 and a filter 72 located within the fresh air channel 20. The fresh air fan 71 is located on a side of the third heat exchanger 46 remote from the second heat exchanger 44. A filter 72 is positioned on a side of the second end 32 of the horizontal heat pipe exchanger 30 adjacent the fresh air inlet 12. Fresh air is driven to flow from the fresh air inlet 21 to the air supply outlet 22 by the fresh air fan 71, and impurities in the external air are filtered by the filter 72, so that the fresh air quality is improved.

In the above embodiment, the compressor 41 and the four-way valve 45 may be disposed in the exhaust passage 10 or the fresh air passage 20. Thus, the whole machine design of the fresh air handling unit is facilitated, and the refrigeration/hot air management is facilitated.

Thus, various embodiments of the present disclosure have been described in detail. In order to avoid obscuring the concepts of the present disclosure, some details known in the art are not described. How to implement the solutions disclosed herein will be fully apparent to those skilled in the art from the above description.

Although some specific embodiments of the present disclosure have been described in detail by way of example, it should be understood by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the present disclosure. It will be understood by those skilled in the art that the foregoing embodiments may be modified and equivalents substituted for elements thereof without departing from the scope and spirit of the disclosure. The scope of the present disclosure is defined by the appended claims.

Claims

1. A fresh air handling unit, comprising:

an exhaust channel (10), two ends of which are respectively provided with an air return inlet (11) and an exhaust outlet (12);

the two ends of the fresh air channel (20) are respectively provided with a fresh air inlet (21) and an air supply outlet (22);

a horizontal heat pipe exchanger (30) having a first end (31) located within the exhaust air channel (10) and a second end (32) located within the fresh air channel (20); and

a heat pump device comprises a compressor (41) forming a heat pump refrigerant circulation loop, a first heat exchanger (42; 42 '), a first throttling element (43) and a second heat exchanger (44), wherein the first heat exchanger (42; 42') is positioned in the exhaust air channel (10), and the second heat exchanger (44) is positioned in the fresh air channel (20).

2. The fresh air handling unit according to claim 1, wherein the die of the horizontal heat pipe exchanger (30) is a channel die.

3. The fresh air handling unit according to claim 1, wherein at least one of a first end (31) of the horizontal heat pipe heat exchanger (30) located within the air discharge channel (10) and a second end (32) located within the fresh air channel (20) has outer fins (311; 321).

4. Fresh air handling unit according to claim 1, characterized in that the air discharge channel (10) and the fresh air channel (20) are arranged at the same height.

5. The fresh air handling unit according to claim 4, wherein the air discharge duct (10) and the fresh air duct (20) are separated by a partition (BA) and are not in communication with each other.

6. The fresh air handling unit of claim 1, further comprising:

and the spraying device (50) is arranged in the exhaust channel (10).

7. The fresh air handling unit of claim 6, wherein the fresh air handling unit has a first mode of operation and a second mode of operation, the spray device (50) being configured to turn on a spray when the fresh air handling unit is in the first mode of operation and/or to turn off a spray when the fresh air handling unit is in the second mode of operation.

8. Fresh air handling unit according to claim 6, wherein the first heat exchanger (42; 42 ') is located at a side of the first end (31) of the horizontal heat pipe heat exchanger (30) adjacent to the return air inlet (11), and the spraying device (50) is located between the first end (31) of the horizontal heat pipe heat exchanger (30) and the first heat exchanger (42; 42').

9. Fresh air handling unit according to claim 6, wherein the first heat exchanger (42; 42 ') is located on a side of the first end (31) of the horizontal heat pipe heat exchanger (30) adjacent to the return air inlet (11), and the shower device (50) is located on a side of the first heat exchanger (42; 42') remote from the first end (31) of the horizontal heat pipe heat exchanger (30).

10. The fresh air handling unit according to claim 6, wherein the first heat exchanger (42; 42 ') is located on a side of the first end (31) of the horizontal heat pipe heat exchanger (30) adjacent to the exhaust air outlet (12), and the spraying device (50) is located on a side of the first end (31) of the horizontal heat pipe heat exchanger (30) remote from the first heat exchanger (42; 42').

11. The fresh air handling unit according to claim 6, wherein the first heat exchanger (42; 42 ') is located on a side of the first end (31) of the horizontal heat pipe heat exchanger (30) adjacent to the exhaust air outlet (12), and the spraying device (50) is located between the first end (31) of the horizontal heat pipe heat exchanger (30) and the first heat exchanger (42; 42').

12. The fresh air handling unit according to any one of claims 6 to 11, further comprising:

an exhaust fan (61) located in the exhaust passage (10) and located at one side of the first end (31) of the horizontal heat pipe exchanger (30) adjacent to the exhaust outlet (12); and

the water baffle (62) is positioned in the exhaust passage (10) and between the exhaust fan (61) and the spraying device (50).

13. The fresh air handling unit according to claim 1, wherein the heat pump apparatus further comprises a four-way valve (45) provided in the heat pump refrigerant circulation circuit, the fresh air handling unit having a first mode of operation and a second mode of operation; the four-way valve (45) is configured to communicate the exhaust port of the compressor (41) with the first heat exchanger (42; 42') and the suction port of the compressor (41) with the second heat exchanger (44) when the fresh air handling unit is in the first mode of operation; the four-way valve (45) is further configured to communicate the exhaust port of the compressor (41) with the second heat exchanger (44) and the suction port of the compressor (41) with the first heat exchanger (42; 42') when the fresh air handling unit is in the second mode of operation.

14. The fresh air handling unit according to claim 13, wherein the heat pump apparatus further comprises a regeneration mechanism forming a regeneration refrigerant flow path, the regeneration mechanism being configured to switch on the regeneration refrigerant flow path for regenerating air flow through the fresh air channel (20) when the fresh air handling unit is in the first mode of operation and/or to switch off the regeneration refrigerant flow path when the fresh air handling unit is in the second mode of operation.

15. The fresh air handling unit according to claim 14, wherein the regeneration mechanism comprises a third heat exchanger (46) and a second throttling element (47) located in the fresh air channel (20), one end of the third heat exchanger (46) is connected to a refrigerant flow path between the first heat exchanger (42; 42') and the four-way valve (45), and the other end of the third heat exchanger (46) is in communication with the second heat exchanger (44) via the second throttling element (47).

16. The fresh air handling unit according to claim 15, wherein the second heat exchanger (44) is located on a side of the second end (32) of the horizontal heat pipe heat exchanger (30) adjacent the supply air outlet (22), and the third heat exchanger (46) is located on a side of the second heat exchanger (44) remote from the second end (32) of the horizontal heat pipe heat exchanger (30).

17. The fresh air handling unit of claim 16, further comprising:

a fresh air fan (71) is positioned in the fresh air channel (20) and at one side of the third heat exchanger (46) away from the second heat exchanger (44); and

a filter (72) is positioned within the fresh air channel (20) and on a side of the second end (32) of the horizontal heat pipe exchanger (30) adjacent the fresh air inlet (12).

18. The fresh air handling unit according to any one of claims 13 to 17, wherein the compressor (41) and the four-way valve (45) are arranged in the exhaust duct (10) or the fresh air duct (20).

19. The fresh air handling unit according to claim 7, 13 or 14, wherein the first mode of operation is a summer mode of operation and the second mode of operation is a winter mode of operation.