CN210718200U

CN210718200U - Heat pump system

Info

Publication number: CN210718200U
Application number: CN201921598250.4U
Authority: CN
Inventors: 李先庭; 姜思航; 梁辰吉昱; 石文星; 吕伟华; 王宝龙
Original assignee: Tsinghua University
Current assignee: Tsinghua University
Priority date: 2019-09-24
Filing date: 2019-09-24
Publication date: 2020-06-09
Anticipated expiration: 2029-09-24

Abstract

The utility model relates to the field of air conditioners, and provides a heat pump system, which comprises a refrigeration loop and a solution circulation unit, wherein the refrigeration loop comprises a compressor, a first heat exchanger, a throttling device and a second heat exchanger, and the first heat exchanger and the second heat exchanger respectively comprise a first refrigerant heat exchange channel and a second refrigerant heat exchange channel; the solution circulating unit comprises a first spraying device, a second spraying device, a first container and a second container; the first spraying device and the second container are respectively communicated with the outlet end and the inlet end of the first heat exchange channel, and the second spraying device and the first container are respectively communicated with the outlet end and the inlet end of the second heat exchange channel. The utility model adopts the solution spraying auxiliary direct expansion type heat pump system to treat the air, so that the evaporation temperature of the heat pump system is increased, and the condensation temperature is reduced; solution pretreatment and secondary spraying heat exchange are simultaneously realized by adopting the first heat exchanger and the second heat exchanger which can realize random heat exchange of three media, and sensible heat exchange of the solution and air can be realized in transitional seasons, so that the purpose of free cold supply is achieved.

Description

Heat pump system

Technical Field

The utility model relates to an air conditioner field especially relates to a heat pump system.

Background

At present, with the improvement of the requirement of people on indoor environment thermal comfort and energy conservation and emission reduction, a heat pump air-conditioning system is widely applied, but the traditional heat pump air-conditioning system still has some defects.

In the traditional heat pump air-conditioning system taking water as secondary refrigerant, the air is cooled, condensed and dehumidified by preparing chilled water in summer, the air supply temperature is too low, the indoor thermal comfort is low, and if the air supply is reheated, cold and heat can be offset, so that energy waste is caused; the condensed water generated in the condensation and dehumidification process is easy to breed bacteria and pollute the indoor environment.

The direct expansion heat pump system has the advantage of reducing the heat exchange link between the refrigerant and the air, but as a traditional small indoor air conditioner, besides the problems, the direct expansion heat pump system also has the following problems: the evaporator and the condenser both utilize temperature difference to carry out sensible heat exchange, so that the evaporation temperature and the condensation temperature are limited by the environment; air cannot be humidified in winter.

The reason why the conventional heat pump system has the above problems is that: in summer, a low-temperature cold source is adopted to simultaneously process the latent heat load and the sensible heat load in a room in a condensing, dehumidifying and cooling mode.

And the temperature and humidity independent control air conditioning system separately processes indoor latent heat load and sensible heat load, and respectively bears the latent heat load and the sensible heat load by fresh air and indoor circulating air, namely, independent dehumidification and humidification equipment is adopted to control the humidity of the fresh air, and the other set of equipment carries out sensible heat cooling processing on the indoor circulating air through a high-temperature cooling source, so that the problems are solved.

However, the air conditioning system with independent temperature and humidity control still has the following disadvantages: the fresh air and circulating air treatment system is adopted, so that the system is complex, the initial investment is high, and the control requirement is high; for air conditioning systems with pure circulating air or small fresh air volume under most conditions, insufficient dehumidification is easy to cause, and the external environment cannot be fully utilized in transitional seasons for free cooling.

In comparison, the existing direct expansion type solid adsorption dehumidification heat pump air conditioning system adopts one set of equipment to solve the problems.

For example, the chinese patent application No. 201110318394.1 discloses a heat pump system driven by waste heat of condensation and based on independent control of heat and humidity by solid dehumidification, wherein a dehumidification evaporator and a regeneration condenser are both made by attaching a solid adsorption material on the surface of a traditional fin-tube heat exchanger, the evaporation cold quantity and the condensation heat quantity are respectively used for dehumidification and regeneration of a moisture absorbent, and the refrigerant pipeline and the air pipeline are switched by a valve according to a certain period to alternately operate. Therefore, the heat pump system cannot continuously operate the air dehumidification condition.

For this reason, the utility model patent of "semi-decoupled cooling and dehumidifying and staged cooling dehumidification heat pump system and method" of chinese patent application No. 201710335443.X solves the problem that air cannot be dehumidified and cooled continuously by separately arranging an evaporator on the basis of the above scheme. There are still some disadvantages: the refrigerant pipeline and the air pipeline are complex and occupy larger space; the solid drying agent is in heat conduction through directly contacting the surface of the heat exchanger, so that large contact thermal resistance exists, and the heat exchange effect needs to be further improved; the solid desiccant coating technology still needs to be developed and matured further; the heat exchanger with the attached adsorption material (material of solid desiccant) has large heat capacity, and the time for reaching a stable state after alternate operation is long, and the sensible heat load processing capacity of the system in the period is often difficult to meet the requirement.

SUMMERY OF THE UTILITY MODEL

The present invention aims at least solving one of the technical problems existing in the prior art or the related art.

In order to achieve the object, the utility model provides a heat pump system, including refrigeration circuit, refrigeration circuit includes compressor, first heat exchanger, throttling arrangement and second heat exchanger, still includes:

a solution circulation unit;

the first heat exchanger and the second heat exchanger respectively comprise refrigerant heat exchange channels for the circulation of refrigerant in the refrigeration loop, the first heat exchanger comprises a first heat exchange channel for the circulation of solution in the solution circulation unit, and the second heat exchanger comprises a second heat exchange channel for the circulation of solution in the solution circulation unit;

the solution circulation unit includes:

the first spraying device is positioned above the first heat exchanger and communicated with the first heat exchange channel;

the second spraying device is positioned above the second heat exchanger and communicated with the second heat exchange channel;

the first containing container is positioned below the first spraying device, receives the solution flowing through the first heat exchanger and is communicated with the second heat exchange channel;

the second container is positioned below the second spraying device, receives the solution flowing through the second heat exchanger and is communicated with the first heat exchange channel;

the first spraying device and the second container are respectively communicated with the outlet end and the inlet end of the first heat exchange channel, and the second spraying device and the first container are respectively communicated with the outlet end and the inlet end of the second heat exchange channel.

According to the utility model discloses an in one of them embodiment, be provided with the third heat exchanger in the solution circulation unit, the third heat exchanger includes two third heat transfer passageways, two the third heat transfer passageway is located respectively first splendid attire container with between the second heat transfer passageway, and second splendid attire container with between the first heat transfer passageway.

According to one embodiment of the present invention, the outlet end of the first heat exchange channel is communicated with the inlet end of the second heat exchange channel through a first pipeline, the outlet end of the second heat exchange channel is communicated with the inlet end of the first heat exchange channel through a second pipeline, and the outlet end of the first heat exchange channel is selected to be communicated with the first spray device or the first pipeline; and an outlet end of the second heat exchange channel is selected to conduct the second spraying device or the second pipeline.

According to one embodiment of the present invention, a third heat exchanger is disposed in the solution circulating unit, the third heat exchanger includes two third heat exchanging channels, and the two third heat exchanging channels are respectively located between the first container and the second heat exchanging channel, and between the second container and the first heat exchanging channel; the first pipeline and the second pipeline respectively comprise different third heat exchange channels.

According to the utility model discloses a wherein one of them embodiment, the third heat exchanger is parallelly connected with the bypass pipeline section, the bypass pipeline section with one of them the third heat transfer passageway alternative switches on.

According to the utility model discloses an in one of them embodiment, solution circulation unit includes first circulating pump and second circulating pump, first circulating pump is located first splendid attire container with between the second spray set, the second circulating pump is located second splendid attire container with between the first spray set.

According to one of the embodiments of the utility model, the refrigeration circuit includes the four-way reversing valve, the compressor passes through the four-way reversing valve intercommunication first heat exchanger and second heat exchanger.

According to one embodiment of the present invention, the first heat exchanger is provided with a first air channel, and the air of the first air channel is fresh air and/or exhaust air; and a second air channel is arranged on the second heat exchanger, and the air of the second air channel is fresh air and/or return air.

According to one embodiment of the present invention, a counter-flow heat exchange or a cross-flow heat exchange is performed between the first air passage and the first spraying device; and countercurrent heat exchange or cross-flow heat exchange is performed between the second air channel and the second spraying device.

The technical scheme of the utility model has following advantage:

firstly, because the first spray device is positioned above the first heat exchanger, the second spray device is positioned above the second heat exchanger, the solution carries out convective heat transfer in a mode of scouring the surfaces of the first heat exchanger and the second heat exchanger, and compared with the heat transfer of a solid desiccant and the condition of thermal contact resistance, the solution convective scouring has better heat transfer effect. Secondly, the heat pump system utilizes the solution circulating unit to assist the direct expansion type heat pump system (refrigeration loop), the self-stable circulating process is realized, simultaneously, the dehumidification heat release and regeneration heat absorption processes of the solution fully utilize the cold quantity of an evaporator and the heat quantity of a condenser of the heat pump system, the dehumidification process higher than the dew point temperature of air is realized on the evaporation side, the evaporation temperature is increased, and the cooling, isothermal or heating dehumidification process can be realized; different from the traditional direct expansion heat pump system which only adopts an air cooling heat exchange mode, the condensation temperature can be reduced by utilizing the vapor evaporation cooling in the solution at the condensation side, and the system performance is obviously improved. Finally, the first heat exchanger and the second heat exchanger are three-medium heat exchangers capable of realizing random heat exchange between every two three media, so that the purposes of pre-cooling solution and inner-cooling moisture absorption in the same equipment or the purposes of pre-heating solution and inner-heating moisture absorption are achieved, and the structure of the heat pump system is more compact. The three media include air (or a two-phase mixture of solution and air), a refrigerant in the refrigeration circuit, and a solution of the solution circulation unit.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a heat pump system according to an embodiment of the present invention;

fig. 2 is a schematic structural diagram of another heat pump system according to an embodiment of the present invention;

FIG. 3 is a schematic illustration of the heat pump system of FIG. 2 in one of its operating conditions;

in the figure: 1. a first heat exchange means; 11. a first spraying device; 12. a first heat exchanger; 2. A second heat exchange means; 21. a second spraying device; 22. a second heat exchanger; 3. a first circulation pump; 4. a second circulation pump; 5. a third heat exchanger; 6. a compressor; 7. a throttling device; 8. A four-way reversing valve; 9. a first air passage; 10. a second air passage; 13. a first valve; 14. a second valve; 15. a third valve; 16. a fourth valve; 17. a fifth valve; 18. A sixth valve; 19. a first pipeline; 20. a second pipeline; 23. a first container; 24. And a second container.

Detailed Description

The following describes embodiments of the present invention in further detail with reference to the accompanying drawings and examples. The following examples are intended to illustrate the invention, but are not intended to limit the scope of the invention.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example" or "some examples" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this description, a schematic representation of the above terms does not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

In the description of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplification of the description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "connected" and "connected" are to be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Fig. 1 to fig. 3 are schematic structural diagrams of a heat pump system according to an embodiment of the present invention. In the figure, the solid line represents a solution line, and the dotted line represents a refrigerant line of the refrigeration circuit.

According to an embodiment of the present invention, there is provided a heat pump system, which employs a solution circulation unit, and can complete continuous and stable dehumidification and regeneration cycles by using moisture absorption and humidification performance of a solution and by using the advantage of fluidity of the solution; and the convection heat exchange effect of the spraying solution is better than the heat conduction effect of the solid adsorption material.

Referring to fig. 1, according to an embodiment of the present invention, a heat pump system is provided, which includes a refrigeration circuit and a solution circulation unit. Wherein the refrigeration circuit comprises a compressor 6, a first heat exchanger 12, a throttle device 7 and a second heat exchanger 22. The solution circulation unit includes a first spray device 11, a second spray device 21, a first container 23, and a second container 24.

The first heat exchanger 12 and the second heat exchanger 22 respectively include a refrigerant heat exchange channel for refrigerant circulation in the refrigeration loop, the first heat exchanger 12 includes a first heat exchange channel for solution circulation in the solution circulation unit, and the second heat exchanger 22 includes a second heat exchange channel for solution circulation in the solution circulation unit. The first spraying device 11 is positioned above the first heat exchanger 12 and communicated with the first heat exchange channel; the second spraying device 21 is positioned above the second heat exchanger 22 and communicated with the second heat exchange channel; the first container 23 is positioned below the first spraying device 11, receives the solution flowing through the first heat exchanger 12 and is communicated with the second heat exchange channel; the second container 24 is located below the second spraying device 21, receives the solution flowing through the second heat exchanger 22, and is communicated with the first heat exchange channel. The first spraying device 11 and the second container 24 are respectively communicated with the outlet end and the inlet end of the first heat exchange channel, and the second spraying device 21 and the first container 23 are respectively communicated with the outlet end and the inlet end of the second heat exchange channel.

The heat pump system has the following advantages:

firstly, as the first spraying device 11 is positioned above the first heat exchanger 12 and the second spraying device 21 is positioned above the second heat exchanger 22, the solution carries out convective heat exchange by scouring the surfaces of the first heat exchanger 12 and the second heat exchanger 22, and compared with the heat conduction of a solid desiccant and the condition of thermal contact resistance, the solution convective scouring has better heat exchange effect.

Secondly, the heat pump system utilizes the solution circulating unit to assist the direct expansion type heat pump system (refrigeration loop), the self-stable circulating process is realized, simultaneously, the dehumidification heat release and regeneration heat absorption processes of the solution fully utilize the cold quantity of an evaporator and the heat quantity of a condenser of the heat pump system, the dehumidification process higher than the dew point temperature of air is realized on the evaporation side, the evaporation temperature is increased, and the cooling, isothermal or heating dehumidification process can be realized; different from the traditional direct expansion heat pump system which only adopts an air cooling heat exchange mode, the condensation temperature can be reduced by utilizing the vapor evaporation cooling in the solution at the condensation side, and the system performance is obviously improved.

Finally, the first heat exchanger 12 and the second heat exchanger 22 are three-medium heat exchangers capable of realizing random heat exchange between two media, so that the purposes of pre-cooling solution and absorbing moisture in inner cooling in the same equipment or the purposes of pre-heating solution and internally heating and dehumidifying are achieved, and the structure of the heat pump system is more compact. The three media include air (or a two-phase mixture of solution and air), a refrigerant in the refrigeration circuit, and a solution of the solution circulation unit. The first spraying device 11, the first heat exchanger 12 and the first container 23 can be regarded as a spraying tower; the second spraying device 21, the second heat exchanger 22 and the second container 24 can be regarded as another spraying tower. The first spraying device 11 and the first heat exchanger 12 are combined to form a heat exchange device, and the heat exchange device is defined as a first heat exchange device 1; the second spraying device 21 and the second heat exchanger 22 are combined to form another heat exchange device, which is defined as a second heat exchange device 2.

In the first heat exchange device 1, air flows through an air passage corresponding to the first heat exchanger 12 (corresponding to the first air passage 9 mentioned later), and the solution flows through the first heat exchange passage in the first heat exchanger 12 in the flow direction and then is sprayed by the first spraying device 11. In the second heat exchanger 2, air flows through the corresponding air passage of the second heat exchanger 22 (corresponding to the second air passage 10 mentioned later), and the solution flows through the second heat exchange passage in the second heat exchanger 22 in the flow direction and then is sprayed by the second spraying device 21.

Referring to fig. 1, a third heat exchanger 5 is disposed in the solution circulating unit, the third heat exchanger 5 includes two third heat exchanging channels, and the two third heat exchanging channels are respectively located between the first container 23 and the second heat exchanging channel, and between the second container 24 and the first heat exchanging channel. Of course, the third heat exchanger 5 may not be provided.

The third heat exchanger 5 here is a heat recovery heat exchanger provided on the piping of the solution circulation unit. It can be used for heat exchange between hygroscopic solution and regenerated solution, and can raise utilization efficiency of energy source.

Referring to fig. 2, a heat pump system is provided, which has all the functions of the heat pump system in fig. 1. In addition to that in fig. 2: the outlet end of the first heat exchange channel is communicated with the inlet end of the second heat exchange channel through a first pipeline 19, the outlet end of the second heat exchange channel is communicated with the inlet end of the first heat exchange channel through a second pipeline 20, and the outlet end of the first heat exchange channel is selected to be communicated with the first spraying device 11 or the first pipeline 19; the outlet end of the second heat exchange channel selects to conduct the second spraying device 21 or the second pipeline 20.

In one case, in fig. 2, the first heat exchange channel is connected to the first spraying device 11, and the second heat exchange channel is connected to the second spraying device 21, so that the working principle of the obtained heat pump system is the same as that of the heat pump system in fig. 1.

In another case, in fig. 2, the first heat exchange channel connects to the first pipeline 19, and the second heat exchange channel connects to the second pipeline 20, so that the working principle of the heat pump system is as shown in fig. 3 (a part of the structure on one side of the refrigeration circuit is omitted in fig. 3, wherein the structure on one side of the refrigeration circuit is the same as that in fig. 1 and 2).

A third heat exchanger 5 is also provided in fig. 2 as in fig. 1, and the function and working principle of the third heat exchanger 5 in fig. 2 are also the same as in fig. 1.

A bypass pipe section can be connected in parallel with the third heat exchanger 5, and the bypass pipe section is alternatively communicated with one of the third heat exchange channels. Furthermore, when the bypass pipe section is switched on and one of the third heat exchange paths of the third heat exchanger 5 is disconnected, the solution flowing out from the evaporation side does not exchange heat with the solution flowing out from the condensation side at this time. Taking fig. 3 as an example, the solution flowing out of the first heat exchanger 12 flows through one of the third heat exchange channels, and the solution flowing out of the second heat exchanger 22 flows through the bypass pipe section, so that the heat exchange between the solutions at the third heat exchanger 5 can be avoided.

In fig. 2, a first valve 13 and a second valve 14 are provided in the bypass line section and the third heat exchange path on the left side, respectively. Obviously, the second valve 14 on the left third heat exchange channel may also be disposed on the right third heat exchange channel, and the bypass pipe section where the first valve 13 is disposed is communicated with the right third heat exchange channel. In addition, the current first valve 13 and the current second valve 14 can be replaced by a three-way valve, so that one of the bypass pipe section and one of the third heat exchange channels is communicated.

In addition, in fig. 2, in order to achieve alternative conduction between the first spraying device 11 and the first pipeline 19, a third valve 15 and a fourth valve 16 are respectively arranged at the inlets of the first pipeline 19 and the first spraying device 11. Similarly, in order to achieve a selective communication between the second spray device 21 and the second pipe 20, a fifth valve 17 and a sixth valve 18 are provided at the inlets of the second pipe 20 and the second spray device 21, respectively. Similarly, the third valve 15 and the fourth valve 16 may be replaced by a three-way valve, and the fifth valve 17 and the sixth valve 18 may be replaced by another three-way valve.

Referring to fig. 2, the solution circulating unit further comprises a first circulating pump 3 and a second circulating pump 4, wherein the first circulating pump 3 is located between the first container 23 and the second spraying device 21, and the second circulating pump 4 is located between the second container 24 and the first spraying device 11.

When the first heat exchange channel is connected to the first spraying device 11 and disconnected from the first pipeline 19, and the second heat exchange channel is connected to the second spraying device 21 and disconnected from the second pipeline 20 in fig. 2, reference may be made to fig. 1 for pipeline connection of the heat pump system. The first circulation pump 3 works to enable the solution in the first container 23 to sequentially pass through the third heat exchange channel and the second heat exchange channel, and finally the solution is sprayed to the second heat exchanger 22 by the second spraying device 21 and falls into the second container 24 through the second heat exchanger 22. The second circulating pump 4 works to enable the solution in the second container 24 to sequentially pass through the third heat exchange channel and the first heat exchange channel, and finally the solution is sprayed to the first heat exchanger 12 by the first spraying device 11 and falls into the first container 23 through the first heat exchanger 12. In this case, the solution in the solution circulation unit flows through the first heat exchanger 12 and the second heat exchanger 22, and the circulation of the solution is achieved.

When the first heat exchange channel is connected to the first pipeline 19 and disconnected from the first spraying device 11, and the second heat exchange channel is connected to the second pipeline 20 and disconnected from the second spraying device 21 in fig. 2, reference may be made to fig. 3 for the pipeline connection of the heat pump system. Wherein the second circulation pump 4 is operated to circulate the solution in the closed loop formed among the first heat exchange channel, the third heat exchange channel, the second heat exchange channel and the bypass pipe section.

Of course, the positions of the first circulation pump 3 and the second circulation pump 4 are not limited by fig. 2 as long as the solution circulation requirement is satisfied.

Referring to fig. 1 and 2, the refrigeration circuit includes a four-way reversing valve 8 through which the compressor 6 communicates with the first heat exchanger 12 and the second heat exchanger 22. Furthermore, the refrigeration circuit can realize refrigeration or heating working conditions.

According to the utility model discloses an embodiment, first heat exchanger 12 department correspondence is formed with first air duct 9, and the air of first air duct 9 is the new trend and one kind in the middle of airing exhaust, perhaps is the mixture of new trend and airing exhaust.

In addition, a second air channel 10 is correspondingly formed at the second heat exchanger 22, and the air of the second air channel 10 is one of fresh air and return air or a mixture of the fresh air and the return air.

According to the utility model discloses an embodiment is countercurrent flow heat transfer or cross flow heat transfer between first air duct 9 and the first spray set 11. That is, the air in the first air channel 9 and the solution sprayed by the first spraying device 11 may exchange heat in a counter-current manner or in a cross-current manner. Similarly, the second air channel 10 and the second spraying device 21 perform heat exchange in a counter-flow manner or a cross-flow manner.

The solution in the solution circulating unit can be saline solution, and any solution with hygroscopic property disclosed in the prior art can be adopted. The solution circulation unit is used for assisting the refrigeration loop, so that the energy efficiency of the heat pump system is improved; and the first heat exchanger 12 and the second heat exchanger 22 are used for carrying out direct expansion type precooling and inner cooling moisture absorption, preheating and inner heat regeneration on the solution at the same time, and free cooling in the form of sensible heat can be realized in a transition season.

When the heat pump system in fig. 2 is used in a cooling and dehumidifying working condition in summer, the heat pump system compressor 6 needs to be opened, the second valve 14, the fourth valve 16 and the sixth valve 18 need to be opened, the first valve 13, the third valve 15 and the fifth valve 17 need to be closed, the first circulating pump 3 and the second circulating pump 4 need to be opened, and the four-way reversing valve 8 needs to be adjusted, so that the first heat exchanger 12 and the second heat exchanger 22 are respectively a condenser and an evaporator of the heat pump system. The circulation of each medium in the heat pump system can be referred to fig. 1:

the air to be treated in the second air channel 10 may be fresh air, return air, or a mixture of fresh air and return air. The air passes through the second heat exchange device 2, is directly contacted with the low-temperature concentrated solution sprayed by the second spraying device 21 and the surface of the second heat exchanger 22, and is changed into low-temperature and low-humidity air after heat and mass exchange is carried out, so that air is supplied. The solution becomes a dilute solution after the air dehumidification process is completed, and flows out of the second heat exchange device 2. In the second heat exchanger 2, the refrigerant of the heat pump system precools the spray solution and cools the air-solution mixed fluid to be processed through the second heat exchanger 22.

The air to be treated of the first air channel 9 may be one or a combination of fresh air and exhaust air. The air passes through the first heat exchange device 1, directly contacts with the high-temperature dilute solution sprayed by the first spraying device 11 and the surface of the first heat exchanger 12, and is changed into high-temperature and high-humidity air after heat and mass exchange and then is discharged. The solution becomes a concentrated solution after the regeneration process is completed and flows out of the first heat exchange device 1. In the first heat exchanger 1, the refrigerant of the heat pump system preheats the spray solution and raises the temperature of the air-solution mixed fluid to be processed through the first heat exchanger 12.

When the heat pump system in fig. 2 is used for heating and humidifying in winter, the heat pump system compressor 6 needs to be opened, the second valve 14, the fourth valve 16 and the sixth valve 18 need to be opened, the first valve 13, the third valve 15 and the fifth valve 17 need to be closed, the first circulating pump 3 and the second circulating pump 4 need to be opened, and the four-way reversing valve 8 needs to be adjusted, so that the first heat exchanger 12 and the second heat exchanger 22 are respectively an evaporator and a condenser of the heat pump system. The circulation of the various media in the heat pump system can also refer to fig. 1:

the air to be treated in the second air channel 10 may be fresh air, return air, or a mixture of fresh air and return air. The air passes through the second heat exchange device 2, directly contacts with the high-temperature dilute solution sprayed by the second spraying device 21 and the surface of the second heat exchanger 22, and is changed into high-temperature and high-humidity air after heat and mass exchange for air supply. The solution is changed into a concentrated solution after the air humidification process is finished, and flows out of the second heat exchange device 2. In the second heat exchanger 2, the refrigerant of the heat pump system preheats the spray solution and raises the temperature of the air-solution mixed fluid to be treated by the second heat exchanger 22.

The air to be treated of the first air channel 9 may be one or a combination of fresh air and exhaust air. The air directly contacts with the low-temperature concentrated solution sprayed by the first spraying device 11 and the surface of the first heat exchanger 12, and is changed into low-temperature and low-humidity air after heat and mass exchange and then is discharged. The solution becomes a dilute solution after finishing the moisture absorption process and flows out of the first heat exchange device 1. In the first heat exchanger 1, the refrigerant of the heat pump system precools the spray solution and cools the air-solution mixed fluid to be processed through the first heat exchanger 12.

When the heat pump system in fig. 2 is used for the transitional season free cooling working condition, the heat pump system compressor 6 needs to be closed, the first valve 13, the third valve 15 and the fifth valve 17 need to be opened, the second valve 14, the fourth valve 16 and the sixth valve 18 need to be closed, the first circulating pump 3 needs to be closed, the second circulating pump 4 needs to be opened, and the sensible heat exchange between the solution and the air needs to be completed only by using the closed solution circulating system. The circulation of the various media in the heat pump system can also refer to fig. 3:

the air to be treated of the second air passage 10 is indoor circulating air. The air directly contacts with the surface of the second heat exchanger 22, and is cooled after sensible heat exchange with the low-temperature solution, and the solution flows out of the second heat exchanger 22 after being heated. The air to be treated in the first air channel 9 is outdoor air, is in direct contact with the surface of the first heat exchanger 12, and is subjected to sensible heat exchange with high-temperature solution to raise the temperature, and the solution flows out of the first heat exchanger 12 after being cooled.

The above embodiments are merely illustrative, and not restrictive, of the present invention. Although the present invention has been described in detail with reference to the embodiments, it should be understood by those skilled in the art that various combinations, modifications or equivalent substitutions may be made to the technical solution of the present invention without departing from the spirit and scope of the technical solution of the present invention, and all of the technical solutions should be covered by the scope of the claims of the present invention.

Claims

1. A heat pump system comprising a refrigeration circuit, the refrigeration circuit comprising a compressor, a first heat exchanger, a throttling device and a second heat exchanger, characterized in that it further comprises:

a solution circulation unit;

the solution circulation unit includes:

2. The heat pump system according to claim 1, wherein a third heat exchanger is disposed in the solution circulating unit, the third heat exchanger includes two third heat exchange channels, and the two third heat exchange channels are respectively located between the first container and the second heat exchange channel, and between the second container and the first heat exchange channel.

3. The heat pump system according to claim 1, wherein an outlet end of the first heat exchange channel is communicated with an inlet end of the second heat exchange channel through a first pipeline, an outlet end of the second heat exchange channel is communicated with an inlet end of the first heat exchange channel through a second pipeline, and the outlet end of the first heat exchange channel is alternatively communicated with the first spray device or the first pipeline; and an outlet end of the second heat exchange channel is selected to conduct the second spraying device or the second pipeline.

4. The heat pump system according to claim 3, wherein a third heat exchanger is disposed in the solution circulating unit, the third heat exchanger includes two third heat exchange channels, and the two third heat exchange channels are respectively located between the first container and the second heat exchange channel, and between the second container and the first heat exchange channel; the first pipeline and the second pipeline respectively comprise different third heat exchange channels.

5. The heat pump system of claim 4, wherein the third heat exchanger is connected in parallel with a bypass section that is in alternative communication with one of the third heat exchange passages.

6. The heat pump system of claim 5, wherein the solution circulation unit comprises a first circulation pump and a second circulation pump, the first circulation pump being located between the first containment vessel and the second spray device, the second circulation pump being located between the second containment vessel and the first spray device.

7. The heat pump system of any one of claims 1 to 6, wherein the refrigeration circuit comprises a four-way reversing valve through which the compressor communicates the first and second heat exchangers.

8. The heat pump system according to any one of claims 1 to 6, wherein a first air channel is arranged on the first heat exchanger, and the air in the first air channel is fresh air and/or exhaust air; and a second air channel is arranged on the second heat exchanger, and the air of the second air channel is fresh air and/or return air.

9. The heat pump system of claim 8, wherein the first air passage is in counter-current or cross-current heat exchange with the first spray device; and countercurrent heat exchange or cross-flow heat exchange is performed between the second air channel and the second spraying device.