An air source heat pump fresh air unit based on solution moisture absorption

Abstract

The present invention discloses an air source heat pump fresh air unit based on solution moisture absorption, comprising a shell, a partition plate provided on the inner side of the shell, and the inner side of the shell is divided into area A, area B, area C, and area D by the partition plate, and an air-to-air heat exchange core is provided at the adjacent centers of the areas A, B, C, and D. The air source heat pump fresh air unit based on solution moisture absorption, when cooling in the summer, only needs to start compression refrigeration in a high humidity environment, and uses indirect evaporative cooling to provide cold air in the summer, which saves more than 40% energy compared with the existing technology. When heating in the winter, it uses concentrated solution to absorb moisture, absorbing not only sensible heat but also latent heat in the air, and there is no defrosting problem of the air source heat pump unit. It is also equipped with a humidification section, which is particularly suitable for use in dry areas in the north, with lower operating energy consumption, which greatly reduces the operating energy consumption of traditional air source heat pump units, is energy-saving and environmentally friendly, and has strong practicality.

Description

Technical Field

[0001] The present invention relates to the technical field of air source heat pumps, and in particular to an air source heat pump fresh air unit based on solution moisture absorption. Background Art

[0002] With the development of the economy, precision processing industries, garment factories, and grain processing enterprises, in particular, require cooling or heating of factory buildings. Cooling or heating these areas often requires traditional chillers (heat pumps) and combined air conditioning units, which operate in a single mode, consume significant energy, and have high operating and maintenance costs. Air-source heat pumps have also been widely adopted in northern China. However, in low ambient conditions, their heating capacity and COP (cost-effectiveness ratio) significantly decrease, and they can also experience frost and defrost issues. This often necessitates the use of auxiliary heat sources, resulting in high initial investment and limited energy efficiency.

[0003] Against the backdrop of the country’s proposal for carbon peak and carbon neutrality, it is necessary to make full use of natural cold sources and carry out cold recovery or heat recovery. Solution dehumidification combined with indirect evaporation can be used to cool (heat) large spaces such as factories to meet the needs of production processes or transform the working environment.

[0004] Indirect evaporative cooling air conditioning technology uses water evaporation as a cooling method, utilizing the working airflow to cool the fresh air. This indirect contact between air and water creates cool air. This technology is currently widely used in the low-humidity environment of Northwest China.

[0005] In the southeastern coastal areas of my country, due to the high relative humidity of the air and the limitations of outdoor meteorological conditions, it is not easy to achieve stable operating conditions by simply using indirect evaporative cooling, so further technological innovation is needed.

[0006] Most of the indirect evaporative air-conditioning units in China only have cooling functions. When heating is needed in winter, traditional heating methods are also required, so cooling and heating can be combined. Summary of the Invention

[0007] The object of the present invention is to provide an air source heat pump fresh air unit based on solution moisture absorption to solve the problems raised in the above background technology.

[0008] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: an air source heat pump fresh air unit based on solution moisture absorption, comprising a shell, a partition plate provided on the inner side of the shell, and the inner side of the shell is divided into area A, area B, area C, and area D by the partition plate, and air outlets are provided on one side of the shell near the area A, area B, area C, and area D, and air-to-air heat exchange cores are provided at the adjacent centers of the areas A, area B, area C, and area D, the area A is connected to the area C through the air-to-air heat exchange core to form a return air channel, and the area B is connected to the area D through the air-to-air heat exchange core to form a fresh air channel;

[0009] A titanium tube heat exchanger is installed inside area A;

[0010] A solution dehumidification section is provided inside area B;

[0011] A return air humidification section is set inside area C.

[0012] Inside area D are located components such as the solution regeneration section and the refrigeration compressor.

[0013] Preferably, a dehumidification refrigeration system is provided on the inner side of the shell, and the dehumidification refrigeration system includes a titanium tube heat exchanger. A circulation duct is provided on the inner side of the titanium tube heat exchanger. The circulation duct passes through the titanium tube heat exchanger and is connected to the compressor and the second condenser. The first condenser is connected to one side of the compressor, and an expansion valve and a drying filter are provided on the circulation duct.

[0014] Preferably, the solution dehumidification section includes a solution dehumidification core, a solution dehumidification spray row is arranged above the solution dehumidification core, a dehumidification solution pool is arranged below the solution dehumidification core, and a fresh air blower is arranged at the air outlet of area B, and the fresh air blower is facing the solution dehumidification core.

[0015] Preferably, the solution dehumidification section is connected to the solution regeneration section through an overflow pipeline.

[0016] Preferably, a bypass vent valve penetrating the shell is provided on the top of the solution dehumidification section.

[0017] Preferably, the solution regeneration section includes a regeneration core, a regeneration spray row is provided above the regeneration core, a solution regeneration pool is provided below the regeneration core, and the solution regeneration pool is connected to the regeneration spray row through a solution regeneration pump.

[0018] Preferably, a sewage discharge pipeline is provided at the bottom of the solution regeneration tank, and a sewage discharge solenoid valve is provided on the sewage discharge pipeline.

[0019] Preferably, the return air humidification section includes a humidification core, a humidification spray row is provided above the humidification core, a humidification water pool is provided below the humidification core, and a humidification pump connected to the humidification spray row is provided inside the humidification core.

[0020] Preferably, the humidifying pool includes a water supply pipeline and a water supply solenoid valve.

[0021] Preferably, an indirect evaporation spray row connected to a water source is provided above one side of the air-to-air heat exchange core close to the solution dehumidification section.

[0022] Compared with the existing technology, the beneficial effects of the present invention are as follows: when cooling in the summer, the air source heat pump fresh air unit based on solution moisture absorption only needs to start compression refrigeration in high humidity environments. In the summer, indirect evaporative cooling is used to provide cold air, saving more than 40% energy compared with the existing technology. When heating in the winter, concentrated solution is used to absorb moisture from the air, absorbing not only sensible heat but also latent heat in the air, eliminating the defrosting problem of the air source heat pump unit. Compared with the existing air source heat pump, it is also equipped with a humidification section, which is particularly suitable for use in dry areas in the north. It has lower operating energy consumption, significantly reducing the operating energy consumption of traditional air source heat pump units, energy saving and environmental protection, and has strong practicality. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a structural diagram of a preferred embodiment of the present invention;

[0024] Figure 2 It is a structural schematic diagram of the present invention.

[0025] In the figure: 1. Shell, 2. Solution pipe, 3. Solution dehumidification spray row, 4. Solution dehumidification core, 5. Indirect evaporation spray row, 6. Fresh air blower, 7. Fresh air filter, 8. Fresh air inlet, 9. Dehumidification solution pool, 10. Solution humidification spray row, 11. Humidification core, 12. Return air blower, 13. Return air outlet, 14. Humidification pump, 15. Water supply solenoid valve, 16. Humidification water pool, 17. Indirect evaporation spray pump, 18. Second condenser, 19. Second refrigeration solenoid valve , 20. Overflow pipe, 21. Circulation duct, 22. Compressor, 23. First refrigeration solenoid valve, 24. Air-to-air heat exchange core, 25. Titanium tube heat exchanger, 26. Expansion valve, 27. Dry filter, 28. First condenser, 29. Solution regeneration pump, 30. Sewage solenoid valve, 31. Solution regeneration tank, 32. Solution dehumidification pump, 33. Fresh air outlet, 34. Regeneration core, 35. Regeneration spray row, 36. Return air inlet, 37. Return air filter, 38. Ventilation valve. DETAILED DESCRIPTION

[0026] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0027] See also Figure 1-2 , the present invention provides a technical solution:

[0028] like Figure 1 As shown, an air source heat pump fresh air unit based on solution moisture absorption has a housing 1 divided into four areas by a partition: area A, area B, area C, and area D. Areas A, B, C, and D are all provided with air vents near the side of the housing. Area A corresponds to a return air inlet 36, area B corresponds to a fresh air inlet 8, area C corresponds to a return air outlet 13, and area D corresponds to a fresh air outlet 33. An air-to-air heat exchange core 24 is provided at the adjacent centers of areas A, B, C, and D. Area A is connected to area C through the air-to-air heat exchange core 24 to form an air inlet channel, and area B is connected to area D through the air-to-air heat exchange core 24 to form an air outlet channel.

[0029] like Figure 2 As shown, an air source heat pump fresh air unit based on solution moisture absorption includes a unit housing 1, on which are arranged a return air inlet and a fresh air inlet. The housing 1 is provided with a fresh air filter 7, a fresh air blower 6, a solution dehumidification section, an air-to-air heat exchange core 24, a first condenser 28, and a solution regeneration section, in accordance with the flow direction of the fresh air entering. The housing 1 is provided with a return air filter 37, an air-to-air heat exchange core 24, a second condenser 18, a return air humidification section, and a return air blower 12, in accordance with the flow direction of the return air entering. A dehumidification and refrigeration system is also provided in the housing 1, including a compressor 22, a titanium tube heat exchanger 25, an expansion valve 26, and a drying filter 27.

[0030] The solution regeneration section includes a regeneration core 34, a regeneration spray row 35 is provided above the regeneration core 34, and a solution regeneration tank 31 is provided below the regeneration core 34. The solution regeneration tank 31 is connected to the regeneration spray row 35 through a solution regeneration pump 29. The solution regeneration tank 31 is provided with a sewage discharge pipeline and a sewage discharge solenoid valve 30. The solution regeneration tank 31 is also connected to the overflow pipeline 20 and the dehumidification solution tank 9 in the solution dehumidification section.

[0031] The solution dehumidification section is provided with a solution dehumidification spray row 3, a solution dehumidification core 4, a dehumidification solution pool 9, etc. The dehumidification solution pool 9 is also connected to the overflow pipe 20 and the solution regeneration pool 31 of the solution regeneration section. The solution dehumidification section is also provided with a bypass air valve 38 for bypassing fresh air during heating in winter.

[0032] The dehumidification refrigeration system is equipped with a compressor 22, a first condenser 28, a second condenser 18, a titanium tube heat exchanger 25, an expansion valve 26 and a drying filter 27. The compressor 22 is connected to the two condensers through exhaust pipes. A first refrigeration solenoid valve 23 is provided on the exhaust pipe of the first condenser 28, and a second refrigeration solenoid valve 19 is provided on the exhaust pipe of the second condenser 18, forming a complete refrigeration system used for dehumidification and air heating of the air source heat pump fresh air unit.

[0033] The return air humidification section is equipped with a humidification spray row 10, a humidification core 11, and a humidification pool 16. The humidification pool 16 is equipped with a humidification pump 14, a water supply pipeline, and a water supply solenoid valve 15. The humidification pool 16 is also equipped with an indirect evaporation spray pump 17, which is connected to the indirect evaporation spray row 5.

[0034] Working principle:

[0035] Summer cooling conditions:

[0036] Fresh air enters through the fresh air inlet 8 and is filtered by the fresh air filter 17. Under the action of the fresh air blower 12, it passes through the solution dehumidification core 4 in the solution dehumidification section. Heat and moisture are exchanged within the solution dehumidification core 4 with the concentrated solution, which is cooled by the titanium tube heat exchanger 25 and then sprayed by the solution dehumidification spray row 3 under the action of the solution dehumidification pump 32. After the humidity of the fresh air is reduced, it enters the air-to-air heat exchange core 24. Within the air-to-air heat exchange core 4, the fresh air from outside exchanges heat with the return air. The air-to-air heat exchange core 24 is divided into a wet channel and a dry channel, with the wet channel carrying fresh air and the dry channel carrying return air. Indoor return air enters the unit through the return air inlet 36, is filtered by the return air filter 37, and then enters the air-to-air heat exchange core 24. An indirect evaporative spray row 5 is also installed on the return air side of the air-to-air heat exchange core 24, utilizing the evaporation of water in the wet channel in a low-humidity environment to cool the return air in the dry channel.

[0037] If the return air after cooling needs to be humidified, in the return air humidification section, the return air and the water sprayed by the humidification spray row 10 under the action of the humidification pump 14 will exchange heat and moisture in the humidification core 11. After the humidity of the return air is increased, it will be sent to the room through the return air outlet 13 by the return air blower 12.

[0038] After the fresh air is dehumidified, the formed dilute solution falls into the dehumidification solution pool 9. When the dehumidification solution pool 9 is full of solution, it enters the solution regeneration pool 31 of the solution regeneration section through the overflow pipe 20. In the solution regeneration section, the dilute solution, under the action of the solution regeneration pump 29, passes through the regeneration spray row 35, and exchanges heat and moisture with the fresh air from the outside that has been heated by the first condenser 28 in the regeneration core 34, realizing the concentrated regeneration of the solution. Finally, the fresh air is discharged from the unit through the fresh air outlet 33.

[0039] Winter heating conditions:

[0040] After entering from the fresh air inlet 8, the fresh air is filtered by the fresh air filter 17, and under the action of the fresh air blower 12, it passes through the solution dehumidification core 4 in the solution dehumidification section, and under the action of the solution dehumidification pump 32, extends through the solution pipe 2 to area A, is cooled by the titanium tube heat exchanger 25, and then is sprayed from the solution dehumidification spray row 3. After the concentrated solution undergoes heat and moisture exchange in the solution dehumidification core 4, the heat in the air is transferred to the solution, and then the fresh air is discharged from the unit through the bypass air valve 38.

[0041] The indoor return air enters the unit through the return air inlet 36, is filtered by the return air filter 37, and then enters the air-to-air heat exchange core 24. At this time, the air-to-air heat exchange core 24 is not working. The return air after leaving the air-to-air heat exchange core 24 enters the second condenser 18, and is heated by the heat transferred from the compressor 22. If the return air needs to be humidified, then in the return air humidification section, the return air and the water sprayed by the humidification spray row 10 under the action of the humidification pump 14 are exchanged with heat and moisture in the humidification core 11. After the humidity of the return air is increased, it is sent to the room through the return air outlet 13 through the return air blower 12.

[0042] Solution concentration process:

[0043] When the solution is concentrated, the bypass air valve 38 is closed and the fresh air is temporarily passed through the air-to-air heat exchange core 24 for heating and used for solution regeneration.

[0044] After the fresh air absorbs moisture, the resulting dilute solution falls into the dehumidification solution pool 9. When the dehumidification solution pool 9 is full, the solution flows through the overflow pipe 20 into the solution regeneration pool 31 of the solution regeneration section. In the solution regeneration section, the dilute solution, under the action of the solution regeneration pump 29, passes through the regeneration spray row 35. In the regeneration core 34, heat and moisture are exchanged with the fresh air from the outside that has been heated by the first condenser 28, achieving concentrated regeneration of the solution. Finally, the fresh air is discharged from the unit through the fresh air outlet 33.

[0045] Refrigeration system process:

[0046] Under the action of the compressor 22, during the summer cooling operation, the first refrigeration solenoid valve 23 is opened and the second refrigeration solenoid valve 19 is closed. After the high-temperature and high-pressure refrigerant gas enters the first condenser 28, the refrigerant gas is condensed into liquid. After passing through the drying filter 27, it enters the expansion valve 26 for throttling and reducing the pressure. It then enters the titanium tube heat exchanger 25. After absorbing the heat of the solution in the titanium tube heat exchanger 25 to cool the solution, the refrigerant liquid evaporates to form refrigerant gas and returns to the compressor 22 again, forming a complete refrigeration cycle. During the winter heating operation, the first refrigeration solenoid valve 23 is closed and the second refrigeration solenoid valve 19 is opened. After the high-temperature and high-pressure refrigerant gas enters the second condenser 18 to heat the indoor return air, the refrigerant gas is condensed into liquid. After passing through the drying filter 27, it enters the expansion valve 26 for throttling and reducing the pressure. It then enters the titanium tube heat exchanger 25. After absorbing the heat from the moisture-absorbing solution outside the room, the refrigerant liquid evaporates to form refrigerant gas and returns to the compressor 22 again, forming a complete refrigeration cycle.

[0047] In the description of the present invention, it should be understood that the terms "coaxial", "bottom", "one end", "top", "middle", "the other end", "upper", "one side", "top", "inside", "front", "center", "both ends", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0048] In the present invention, unless otherwise clearly stipulated and limited, the terms "install", "set", "connect", "fix", "screw" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal connection of two elements or the interaction relationship between two elements. Unless otherwise clearly defined, ordinary technicians in this field can understand the specific meanings of the above terms in the present invention according to the specific circumstances.

[0049] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. An air source heat pump fresh air unit based on solution moisture absorption, characterized by: The invention comprises a shell (1), wherein a partition is provided on the inner side of the shell (1), and the inner side of the shell (1) is divided into area A, area B, area C, and area D by the partition, and the areas A, B, C, and D are each provided with an air outlet near one side of the shell, and an air-to-air heat exchange core (24) is provided at the adjacent centers of the areas A, B, C, and D, and the area A is connected to the area C through the air-to-air heat exchange core (24) to form a return air channel, and the area B is connected to the area D through the air-to-air heat exchange core (24) to form a fresh air channel; A titanium tube heat exchanger is installed inside area A; A solution dehumidification section is provided inside area B; A return air humidification section is provided inside area C; Inside area D, there is a solution regeneration section and a refrigeration compressor; A dehumidification refrigeration system is provided on the inner side of the shell (1), and the dehumidification refrigeration system includes a titanium tube heat exchanger (25). A circulation conduit (21) is provided on the inner side of the titanium tube heat exchanger (25). The circulation conduit (21) passes through the titanium tube heat exchanger (25) and is connected to the compressor (22) and the second condenser (18), wherein the second condenser (18) is located in area C and is close to one side of the air-to-air heat exchange core (24); the first condenser (28) is connected to one side of the compressor (22), and an expansion valve (26) and a drying filter (27) are provided on the circulation conduit (21); A bypass air valve (38) penetrating the shell (1) is provided at the top of the solution dehumidification section.

2. The air source heat pump fresh air unit based on solution moisture absorption according to claim 1, characterized in that: The solution dehumidification section comprises a solution dehumidification core (4), a solution dehumidification spray row (3) is provided above the solution dehumidification core (4), a dehumidification solution pool (9) is provided below the solution dehumidification core (4), and a fresh air blower (6) is provided at the air outlet of the area B, and the fresh air blower (6) is directly facing the solution dehumidification core (4).

3. The air source heat pump fresh air unit based on solution moisture absorption according to claim 1, characterized in that: The solution dehumidification section is connected to the solution regeneration section via an overflow pipeline (20).

4. The air source heat pump fresh air unit based on solution moisture absorption according to claim 1, characterized in that: The solution regeneration section comprises a regeneration core (34), a regeneration spray row (35) is provided above the regeneration core (34), a solution regeneration pool (31) is provided below the regeneration core (34), and the solution regeneration pool (31) is connected to the regeneration spray row (35) via a solution regeneration pump (29).

5. The air source heat pump fresh air unit based on solution moisture absorption according to claim 4, characterized in that: A sewage discharge pipeline is provided at the bottom of the solution regeneration tank (31), and a sewage discharge solenoid valve (30) is provided on the sewage discharge pipeline.

6. The air source heat pump fresh air unit based on solution moisture absorption according to claim 1, characterized in that: The return air humidification section comprises a humidification core (11), a humidification spray row (10) is provided above the humidification core (11), a humidification water pool (16) is provided below the humidification core (11), and a humidification pump (14) connected to the humidification spray row (10) is provided in the humidification water pool (16).

7. The air source heat pump fresh air unit based on solution moisture absorption according to claim 6, characterized in that: The humidification water pool (16) includes a water supply pipeline and a water supply solenoid valve (15).

8. The air source heat pump fresh air unit based on solution moisture absorption according to claim 1, characterized in that: An indirect evaporation spray row (5) connected to a water source is provided above one side of the air-to-air heat exchange core (24) close to the solution dehumidification section.

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