CN110595106B - Heat pump system - Google Patents

Heat pump system Download PDF

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Publication number
CN110595106B
CN110595106B CN201910905210.8A CN201910905210A CN110595106B CN 110595106 B CN110595106 B CN 110595106B CN 201910905210 A CN201910905210 A CN 201910905210A CN 110595106 B CN110595106 B CN 110595106B
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heat
heat exchange
heat exchanger
air
solution
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CN110595106A (en
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李先庭
姜思航
梁辰吉昱
石文星
吕伟华
王宝龙
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Tsinghua University
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Tsinghua University
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B25/00Machines, plants or systems, using a combination of modes of operation covered by two or more of the groups F25B1/00 - F25B23/00
    • F25B25/02Compression-sorption machines, plants, or systems
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B39/00Evaporators; Condensers
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B41/00Fluid-circulation arrangements
    • F25B41/20Disposition of valves, e.g. of on-off valves or flow control valves

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Central Air Conditioning (AREA)

Abstract

The invention relates to the field of air conditioners, and provides a heat pump system, which comprises a refrigerating loop and a solution circulating unit, wherein the refrigerating 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 circulation unit comprises a first spraying device, a second spraying device, a first containing container and a second containing container; the first spraying device and the second containing 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 containing container are respectively communicated with the outlet end and the inlet end of the second heat exchange channel. The invention adopts the solution spraying auxiliary direct expansion 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; the first heat exchanger and the second heat exchanger which can realize any two-by-two heat exchange of three media are adopted to realize solution pretreatment and spray heat exchange again at the same time, and the sensible heat exchange of the solution and air can be realized in transition seasons, so that the aim of free cooling is fulfilled.

Description

Heat pump system
Technical Field
The invention relates to the field of air conditioners, in particular to a heat pump system.
Background
At present, with the improvement of the heat comfort level of indoor environment and the requirements of energy conservation and emission reduction of people, the 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 a refrigerating medium, 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 are counteracted, so that energy waste is caused; the condensed water produced in the condensation and dehumidification process is easy to grow 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 indoor small-sized air conditioner, the following problems are also existed besides the problems: the evaporator and the condenser both utilize the temperature difference to perform sensible heat exchange, so that the evaporation temperature and the condensation temperature are limited by the environment; the 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 treat the latent heat load and the sensible heat load in the room in a condensation, dehumidification and temperature reduction mode.
The temperature and humidity independent control air conditioning system separately processes the indoor latent heat load and the sensible heat load, and is respectively borne 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 performs sensible heat cooling treatment on the indoor circulating air through a high-temperature cold source, so that the problems are solved.
However, the temperature and humidity independent control air conditioning system still has the following defects: the fresh air and circulating air treatment systems are adopted, the system is complex, the initial investment is high, and the control requirement is high; for the air conditioning system with pure circulating air or smaller fresh air quantity under most conditions, dehumidification is insufficient easily, and the external environment cannot be fully utilized for free cooling in transitional seasons.
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 invention patent of a condensation waste heat driven heat and humidity independent control heat pump system based on solid dehumidification with the Chinese patent application number 201110318394.1 is that a dehumidifying evaporator and a regenerative condenser are both made by attaching solid adsorption materials on the surface of a traditional fin-tube heat exchanger, evaporation cold energy and condensation heat are respectively used for the dehumidifying and regenerating processes of a moisture absorbent, and a refrigerant pipeline and an air pipeline are switched to alternately operate according to a certain period through a valve. Therefore, the heat pump system cannot continuously operate the air dehumidifying operation.
Therefore, the invention patent of the semi-decoupling type cooling, dehumidifying and staged cooling dehumidifying heat pump system and method with the Chinese patent application number of 201710335443.X solves the problem that air cannot be continuously dehumidified and cooled by independently arranging an evaporator on the basis of the scheme. There are still some disadvantages: the refrigerant pipeline and the air pipeline are complex, and occupy a large space; the solid desiccant conducts heat by directly contacting the surface of the heat exchanger, so that larger contact thermal resistance exists, and the heat exchange effect needs to be further improved; the solid desiccant coating technology is still to be developed and matured further; the heat exchanger with the adsorption material (solid desiccant material) has larger heat capacity, and the time for reaching a stable state after the alternate operation is longer, and the sensible heat load processing capacity of the system in the time is often difficult to meet the requirement.
Disclosure of Invention
The present invention aims to solve at least one of the technical problems existing in the prior art or related art.
To achieve the object, the present invention provides a heat pump system including a refrigeration circuit including a compressor, a first heat exchanger, a throttle device, and a second heat exchanger, further including:
a solution circulation unit;
the first heat exchanger and the second heat exchanger respectively comprise a refrigerant heat exchange channel for cooling circulation in the refrigerating loop, the first heat exchanger comprises a first heat exchange channel for solution circulation in the solution circulation unit, and the second heat exchanger comprises a second heat exchange channel for solution circulation in the solution circulation unit;
the solution circulation unit includes:
the first spraying device is positioned above the first heat exchanger and is communicated with the first heat exchange channel;
the second spraying device is positioned above the second heat exchanger and is communicated with the second heat exchange channel;
the first containing container is positioned below the first spraying device, is used for receiving the solution flowing through the first heat exchanger and is communicated with the second heat exchange channel;
the second containing container is positioned below the second spraying device, is used for receiving the solution flowing through the second heat exchanger and is communicated with the first heat exchange channel;
the first spraying device and the second containing 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 containing container are respectively communicated with the outlet end and the inlet end of the second heat exchange channel.
According to one embodiment of the present invention, a third heat exchanger is disposed in the solution circulation unit, and 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.
According to one embodiment of the 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 selectively communicated with the first spraying device or the first pipeline; and the outlet end of the second heat exchange channel is used for selectively conducting 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 circulation unit, and 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 and second conduits each include a different one of the third heat exchange channels.
According to one embodiment of the invention, the third heat exchanger is connected in parallel with a bypass pipe section, and the bypass pipe section is selectively communicated with one of the third heat exchange channels.
According to one embodiment of the invention, the solution circulation unit comprises a first circulation pump and a second circulation pump, the first circulation pump is located between the first holding container and the second spraying device, and the second circulation pump is located between the second holding container and the first spraying device.
According to one embodiment of the invention, the refrigeration circuit comprises a four-way reversing valve, and the compressor is communicated with the first heat exchanger and the second heat exchanger through the four-way reversing valve.
According to one embodiment of the invention, a first air channel is arranged on the first heat exchanger, and the air of the first air channel is fresh air and/or exhausted air; the second heat exchanger is provided with a second air channel, and the air of the second air channel is fresh air and/or return air.
According to one embodiment of the invention, the first air channel exchanges heat with the first spraying device in a countercurrent or cross-flow manner; and the second air channel exchanges heat with the second spraying device in a countercurrent or cross-flow manner.
The technical scheme of the invention has the following advantages:
firstly, because first spray set is located first heat exchanger top, and second spray set is located the second heat exchanger top, solution carries out heat convection through the form of washing first heat exchanger and second heat exchanger surface, compares the heat conduction of solid drier and exists the condition of contact thermal resistance, and solution convection washout has better heat transfer effect. Secondly, the heat pump system utilizes the solution circulation unit to assist the direct expansion heat pump system (refrigeration loop), the dehumidification heat release and regeneration heat absorption process of the solution fully utilizes the evaporator cold quantity and the condenser heat quantity of the heat pump system while realizing the self-stable circulation process, the dehumidification process higher than the dew point temperature of air is realized at the evaporation side, the evaporation temperature is improved, and the cooling, isothermal or warming dehumidification process can be realized; unlike the traditional direct expansion heat pump system, which adopts only air cooling heat exchange mode, the condensing temperature can be lowered by utilizing the vapor evaporation cooling of the solution at the condensing 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 any two-by-two heat exchange among three mediums, so that the purposes of solution precooling and internal cooling moisture absorption in the same equipment or the purposes of solution preheating and internal heating moisture absorption are achieved, and the heat pump system is more compact in structure. The three media include air (or a two-phase mixture of solution and air), a refrigerant in a refrigeration circuit, and a solution of a solution circulation unit.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of one of the heat pump systems according to the embodiments of the present invention;
FIG. 2 is a schematic 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 device; 11. a first spraying device; 12. a first heat exchanger; 2. a second heat exchange device; 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 throttle 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
Embodiments of the present invention are described in further detail below with reference to the accompanying drawings and examples. The following examples are illustrative of the invention but are not intended to limit the scope of the invention.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means 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 present invention. In this description, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.
In the description of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, merely to facilitate description of the present invention and simplify the description, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore 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 should be noted that, unless explicitly specified and limited otherwise, the terms "connected," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
Fig. 1 to 3 are schematic structural diagrams of a heat pump system according to an embodiment of the present invention. In the drawing, the solid line represents a solution line, and the broken line represents a refrigerant line of the refrigeration circuit.
According to the embodiment of the invention, a heat pump system is provided, which adopts a solution circulation unit, and can complete continuous and stable dehumidification and regeneration circulation by utilizing the moisture absorption and humidification performances of the solution and the advantage of fluidity of the solution; and the convection heat exchange effect of the spray solution is better than that 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 holding container 23, and a second holding container 24.
Wherein, the first heat exchanger 12 and the second heat exchanger 22 respectively comprise a refrigerant heat exchange channel for refrigerant circulation in the refrigeration loop, the first heat exchanger 12 comprises a first heat exchange channel for solution circulation in the solution circulation unit, and the second heat exchanger 22 comprises 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 is communicated with the first heat exchange channel; the second spraying device 21 is positioned above the second heat exchanger 22 and is 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 holding 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, because the first spraying device 11 is located above the first heat exchanger 12, the second spraying device 21 is located above the second heat exchanger 22, the solution performs convective heat exchange in a manner of flushing the surfaces of the first heat exchanger 12 and the second heat exchanger 22, and compared with the heat conduction of the solid desiccant and the condition that the solid desiccant has contact thermal resistance, the solution convective flushing has better heat exchange effect.
Secondly, the heat pump system utilizes the solution circulation unit to assist the direct expansion heat pump system (refrigeration loop), the dehumidification heat release and regeneration heat absorption process of the solution fully utilizes the evaporator cold quantity and the condenser heat quantity of the heat pump system while realizing the self-stable circulation process, the dehumidification process higher than the dew point temperature of air is realized at the evaporation side, the evaporation temperature is improved, and the cooling, isothermal or warming dehumidification process can be realized; unlike the traditional direct expansion heat pump system, which adopts only air cooling heat exchange mode, the condensing temperature can be lowered by utilizing the vapor evaporation cooling of the solution at the condensing 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 any two-by-two heat exchange between three mediums, so that the purposes of solution precooling and internal cooling moisture absorption in the same equipment or the purposes of solution preheating and internal heating moisture absorption are achieved, and the heat pump system is more compact in structure. The three media include air (or a two-phase mixture of solution and air), a refrigerant in a refrigeration circuit, and a solution of a solution circulation unit. Wherein the first spray device 11, the first heat exchanger 12 and the first holding container 23 can be regarded as one spray tower; the second spray device 21, the second heat exchanger 22 and the second holding vessel 24 may be regarded as a further spray tower. The first spray device 11 and the first heat exchanger 12 combine to form one heat exchange device, which is defined as a first heat exchange device 1; the second spray device 21 and the second heat exchanger 22 combine to form another heat exchange device, which is defined as second heat exchange device 2.
In the first heat exchanger 1, air flows through the corresponding air passage (corresponding to the first air passage 9 mentioned later) of the first heat exchanger 12, and the solution passes through the first heat exchanger passage in the first heat exchanger 12 in the flow direction and then is sprayed through the first spraying device 11. In the second heat exchanger device 2, the air flows through the corresponding air passage (corresponding to the second air passage 10 mentioned later) of the second heat exchanger 22, and the solution passes through the second heat exchanger passage in the second heat exchanger 22 in the flow direction and then is sprayed through the second spraying device 21.
Referring to fig. 1, a third heat exchanger 5 is disposed in the solution circulation unit, and the third heat exchanger 5 includes two third heat exchange channels, and the two third heat exchange channels are respectively located between the first container 23 and the second heat exchange channel, and between the second container 24 and the first heat exchange channel. Of course, the third heat exchanger 5 may not be provided.
The third heat exchanger 5 here is a heat recovery heat exchanger arranged on a pipeline of the solution circulation unit. The device can be used for heat exchange between the hygroscopic solution and the regenerated solution, and improves the utilization efficiency of energy.
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 this, 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 communicated with the first spraying device 11 or the first pipeline 19; the outlet end of the second heat exchange channel is selectively communicated with a second spraying device 21 or the second pipeline 20.
In one case, in fig. 2, the first heat exchange channel is conducted with the first spraying device 11, and the second heat exchange channel is conducted with the second spraying device 21, so that the working principle of the 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 is connected to the first pipeline 19, and the second heat exchange channel is connected to the second pipeline 20, so as to obtain the working principle of the heat pump system as shown in fig. 3 (the part of the structure on the side of the refrigeration circuit is omitted in fig. 3, wherein the structure on the side of the refrigeration circuit is different from that in fig. 1 and 2).
The third heat exchanger 5 is also provided as in fig. 2 and 1, and the third heat exchanger 5 in fig. 2 functions and works in the same manner as in fig. 1.
The third heat exchanger 5 may be connected in parallel with a bypass pipe section, and the bypass pipe section is selectively connected with one of the third heat exchange channels. Further, when one of the third heat exchange channels of the third heat exchanger 5 is opened by turning on the bypass pipe section, heat exchange does not occur between the solution flowing out from the evaporation side and 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 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 arranged on the bypass pipe section and the third heat exchange channel on the left side, respectively. Obviously, the second valve 14 on the left third heat exchange channel can also be arranged on the right third heat exchange channel, and the bypass pipe section provided with the first valve 13 is communicated with the right third heat exchange channel. And, can also replace present first valve 13 and second valve 14 through the three-way valve, and then realize the alternative switching on of bypass tube section and one of them third heat transfer channel.
In fig. 2, a third valve 15 and a fourth valve 16 are provided at the inlet of the first line 19 and the first spray device 11, respectively, in order to achieve alternative communication between the first spray device 11 and the first line 19. Similarly, in order to achieve alternative communication between the second spraying device 21 and the second pipeline 20, a fifth valve 17 and a sixth valve 18 are respectively arranged at the inlets of the second pipeline 20 and the second spraying device 21. Similarly, the current third valve 15 and fourth valve 16 may be replaced by one three-way valve, and the fifth valve 17 and sixth valve 18 may be replaced by another three-way valve.
Referring to fig. 2, the solution circulation unit further includes a first circulation pump 3 and a second circulation pump 4, the first circulation pump 3 being located between the first containing vessel 23 and the second spraying device 21, and the second circulation pump 4 being located between the second containing vessel 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, the pipeline connection of the heat pump system can refer to fig. 1. The first circulating 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, finally, the solution is sprayed to the second heat exchanger 22 by the second spraying device 21, and the solution falls into the second container 24 through the second heat exchanger 22. The second circulating pump 4 works so that the solution in the second container 24 sequentially passes through the third heat exchange channel and the first heat exchange channel, is finally 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 solution circulation is achieved.
When the first heat exchange channel is connected to the first pipeline 19 and disconnected from the first spraying device 11 in fig. 2, and the second heat exchange channel is connected to the second pipeline 20 and disconnected from the second spraying device 21 in fig. 2, the pipeline connection of the heat pump system can refer to fig. 3. Wherein the second circulation pump 4 operates such that the solution circulates in a closed loop formed between the first heat exchange channel, the third heat exchange channel, the second heat exchange channel and the bypass pipe section.
Of course, the arrangement 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 refrigerating loop can realize refrigerating or heating working conditions.
According to the embodiment of the invention, the first heat exchanger 12 is correspondingly provided with the first air channel 9, and the air of the first air channel 9 is one of fresh air and exhaust air or is a mixture of the fresh air and the exhaust air.
In addition, a second air channel 10 is correspondingly formed at the second heat exchanger 22, and the air in 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 an embodiment of the invention, the first air channel 9 exchanges heat with the first spraying device 11 in countercurrent or in cross flow. That is, the air in the first air passage 9 and the solution sprayed by the first spraying device 11 may be subjected to countercurrent heat exchange or cross-flow heat exchange. Likewise, the second air passage 10 exchanges heat with the second shower device 21 in countercurrent or in cross-flow.
The solution in the solution circulation unit may be a salt solution, and of course, any solution having a hygroscopic property disclosed in the prior art may be used. 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 utilized to simultaneously perform direct expansion pre-cooling, internal cooling and moisture absorption, preheating and internal heat regeneration on the solution, and free cooling in a sensible heat form can be realized in transitional seasons.
For the heat pump system in fig. 2, when the heat pump system is used for cooling and dehumidifying in summer, the compressor 6 of the heat pump system is required to be opened, the second valve 14, the fourth valve 16 and the sixth valve 18 are opened, the first valve 13, the third valve 15 and the fifth valve 17 are closed, the first circulating pump 3 and the second circulating pump 4 are opened, and the four-way reversing valve 8 is adjusted so that the first heat exchanger 12 and the second heat exchanger 22 are respectively the condenser and the evaporator of the heat pump system. The circulation of each medium in the heat pump system can be referred to in fig. 1:
the air to be treated in the second air passage 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 low-temperature concentrated solution sprayed by the second spraying device 21 and the surface of the second heat exchanger 22, and changes into low-temperature low-humidity air for air supply after heat mass exchange. The solution becomes a dilute solution after the air dehumidifying 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 treated by the second heat exchanger 22.
The air to be treated in the first air passage 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 mass exchange, and 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 heats the air-solution mixed fluid to be treated by the first heat exchanger 12.
For the heat pump system in fig. 2, when the heat pump system is used for heating and humidifying in winter, the heat pump system compressor 6 is required to be opened, the second valve 14, the fourth valve 16 and the sixth valve 18 are required to be opened, the first valve 13, the third valve 15 and the fifth valve 17 are required to be closed, the first circulating pump 3 and the second circulating pump 4 are required to be opened, and the four-way reversing valve 8 is required 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 media in the heat pump system can also be referred to in fig. 1:
the air to be treated in the second air passage 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 changes into high-temperature high-humidity air for air supply after heat mass exchange. The solution becomes a concentrated solution after the air humidification 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 preheats the spray solution and heats the air-solution mixed fluid to be treated by the second heat exchanger 22.
The air to be treated in the first air passage 9 may be one or a combination of fresh air and exhaust air. The air is directly contacted 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 low-humidity air after heat mass exchange and is discharged. The solution becomes a dilute solution after the moisture absorption 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 precools the spray solution and cools the air-solution mixed fluid to be treated by the first heat exchanger 12.
For the heat pump system in fig. 2, when the heat pump system is used for the free cold supply working condition in the transitional season, the compressor 6 of the heat pump system is required to be closed, the first valve 13, the third valve 15 and the fifth valve 17 are opened, the second valve 14, the fourth valve 16 and the sixth valve 18 are closed, the first circulating pump 3 is closed, the second circulating pump 4 is opened, and the sensible heat exchange between the solution and the air is completed only by using the closed solution circulating system. The circulation of the media in the heat pump system can also be referred to in fig. 3:
the air to be treated in the second air passage 10 is indoor circulating air. The air is in direct contact with the surface of the second heat exchanger 22, is subjected to sensible heat exchange with the low-temperature solution, is cooled, and flows out of the second heat exchanger 22 after the temperature of the solution is raised. 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, performs sensible heat exchange with the high-temperature solution to raise the temperature, and flows out of the first heat exchanger 12 after the solution is cooled.
The above embodiments are only for illustrating the present invention, and are not limiting of the present invention. While the invention has been described in detail with reference to the embodiments, those skilled in the art will appreciate that various combinations, modifications, and substitutions can be made thereto without departing from the spirit and scope of the invention as defined in the appended claims.

Claims (6)

1. A heat pump system comprising a refrigeration circuit including a compressor, a first heat exchanger, a throttling device, and a second heat exchanger, further comprising:
a solution circulation unit;
the first heat exchanger and the second heat exchanger respectively comprise a refrigerant heat exchange channel for cooling circulation in the refrigerating loop, the first heat exchanger comprises a first heat exchange channel for solution circulation in the solution circulation unit, and the second heat exchanger comprises a second heat exchange channel for solution circulation in the solution circulation unit;
the solution circulation unit includes:
the first spraying device is positioned above the first heat exchanger and is communicated with the first heat exchange channel;
the second spraying device is positioned above the second heat exchanger and is communicated with the second heat exchange channel;
the first containing container is positioned below the first spraying device, is used for receiving the solution flowing through the first heat exchanger and is communicated with the second heat exchange channel;
the second containing container is positioned below the second spraying device, is used for receiving the solution flowing through the second heat exchanger and is communicated with the first heat exchange channel;
the first spraying device and the second containing 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 containing container are respectively communicated with the outlet end and the inlet end of the second heat exchange channel; 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, and 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;
the solution circulation unit is internally provided with a third heat exchanger, the third heat exchanger comprises two third heat exchange channels, and the two third heat exchange channels are respectively positioned between the first containing container and the second heat exchange channels and between the second containing container and the first heat exchange channels; the first and second conduits each include a different one of the third heat exchange channels.
2. The heat pump system of claim 1, wherein the third heat exchanger is connected in parallel with a bypass pipe segment, the bypass pipe segment being in selective communication with one of the third heat exchange channels.
3. The heat pump system of claim 2, wherein the solution circulation unit comprises a first circulation pump and a second circulation pump, the first circulation pump being located between the first holding vessel and the second spray device, the second circulation pump being located between the second holding vessel and the first spray device.
4. A heat pump system according to any one of claims 1 to 3, wherein the refrigeration circuit comprises a four-way reversing valve through which the compressor communicates with the first and second heat exchangers.
5. A heat pump system according to any one of claims 1 to 3, wherein the first heat exchanger is provided with a first air passage, the air of the first air passage being fresh air and/or exhaust air; the second heat exchanger is provided with a second air channel, and the air of the second air channel is fresh air and/or return air.
6. The heat pump system of claim 5, wherein the first air passageway exchanges heat against flow or cross flow with the first spray device; and the second air channel exchanges heat with the second spraying device in a countercurrent or cross-flow manner.
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CN112212418B (en) * 2020-01-16 2024-04-26 清华大学 Solution auxiliary heat pump system with adjustable heat-humidity ratio
CN112739165A (en) * 2020-12-24 2021-04-30 北京百度网讯科技有限公司 Cooling device, cooling system and data center

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CN107525166A (en) * 2016-06-21 2017-12-29 清华大学 A kind of liquid desiccant air conditioning unit of heat pump driven pre-cooling type internally cooled
CN206037294U (en) * 2016-08-30 2017-03-22 天津市万丰化工设备有限公司 Two -stage cooling solution humidifying unit that cooling tower and heat pump system combine
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