An air-source heat pump solution dehumidification and defrosting system and method

Abstract

The present invention relates to the technical field of air-conditioning systems, and more specifically, to an air source heat pump solution dehumidification and frost suppression system and method, comprising a solution dehumidification circulation loop, a solution regeneration circulation loop and a refrigerant circulation loop. Through the continuous execution of the solution dehumidification circulation and the solution regeneration circulation, an outdoor heat exchanger can exchange heat with outdoor dry air to avoid the occurrence of frosting. In the dehumidification solution regeneration heat source, the inevitable waste heat of the compressor of the air source heat pump is selected for regeneration, so that low-grade energy is utilized, the energy utilization rate is improved, and the energy consumption and cost are reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioning systems, and more specifically, to an air source heat pump solution dehumidification and frost suppression system and method. Background Art

[0002] Air source heat pumps are widely used because of their advantages of both cooling and heating, energy saving and environmental protection, low operating costs, safety and reliability, etc. However, in low temperature and high humidity environments, the finned coils of the outdoor unit of the air source heat pump are prone to frost. After frosting, the air flow cross-sectional area of ​​the finned tube evaporator is reduced, the flow resistance and heat transfer resistance are increased, the air flow rate and evaporation temperature are reduced, and the heating performance and efficiency of the heat pump are reduced.

[0003] At present, in order to maintain the stable operation of air source heat pump units, reverse cycle defrosting, hot gas bypass, electric heating and other methods are often used for defrosting and frost suppression. However, repeated defrosting will reduce the overall efficiency of the system, high system energy consumption and uneven defrosting, and the frosting problem of air source heat pumps has not been fundamentally solved. In recent years, some scholars have proposed a variety of frost-free air source heat pump systems, but they cannot solve the problem of solution regeneration or high energy consumption.

[0004] The prior art discloses a frost-free air source heat pump system based on low-pressure compressed solution regeneration, which utilizes solution dehumidification to dry the evaporator inlet air to achieve frost-free operation of the air source heat pump, and utilizes a low-pressure compression regenerator to regenerate the solution. The evaporated water vapor is compressed by the compressor and becomes high-temperature and high-pressure steam, which is condensed in the regenerator. All the condensation heat is recovered for regeneration of the diluted solution, thereby reducing the regeneration temperature of the solution and improving the regeneration efficiency. However, in this solution, the additional compressor increases energy consumption, the cost is high, and the system is complex. Summary of the invention

[0005] The purpose of the present invention is to overcome the deficiencies of the prior art and to provide an air source heat pump solution dehumidification and frost suppression system and method, which can conveniently dehumidify the air and regenerate the dehumidification solution, thereby improving energy utilization and reducing energy consumption and costs.

[0006] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0007] Provided is an air source heat pump solution dehumidification and frost suppression system, comprising a refrigerant circulation loop, a solution dehumidification circulation loop and a solution regeneration circulation loop;

[0008] The refrigerant circulation loop includes a compressor, a four-way reversing valve, an indoor heat exchanger, a throttle valve and an outdoor heat exchanger, the output end of the compressor is connected to the input end of the indoor heat exchanger through the four-way reversing valve, the output end of the indoor heat exchanger is connected to the input end of the outdoor heat exchanger through the throttle valve, and the output end of the outdoor heat exchanger is connected to the input end of the compressor through the four-way reversing valve;

[0009] The solution dehumidification circulation loop includes a dehumidifier, a first three-way valve, a first liquid storage tank, a second liquid storage tank, a second three-way valve and a first solution pump; the first liquid storage tank and the second liquid storage tank are both provided with a low-temperature dilute dehumidification solution inlet and a low-temperature concentrated dehumidification solution outlet, the two low-temperature dilute dehumidification solution inlets are respectively connected to the output end of the dehumidifier through the first three-way valve, the two low-temperature concentrated dehumidification solution outlets are respectively connected to the input end of the first solution pump through the second three-way valve, and the output end of the first solution pump is connected to the input end of the dehumidifier;

[0010] The solution regeneration circulation loop comprises a heat reservoir, a regenerator, a second solution pump, a third three-way valve, a fourth three-way valve, and the first liquid storage tank and the second liquid storage tank. The compressor is a closed compressor. The heat reservoir is mounted on the outer wall of the compressor. The first liquid storage tank and the second liquid storage tank are both provided with a low-temperature dilute dehumidification solution outlet and a high-temperature concentrated dehumidification solution inlet. The two low-temperature dilute dehumidification solution outlets are connected to the input end of the heat reservoir through the third three-way valve, the output end of the heat reservoir is connected to the input end of the regenerator, the output end of the regenerator is connected to the input end of the second solution pump, and the two high-temperature concentrated dehumidification solution inlets are connected to the output end of the second solution pump through the fourth three-way valve.

[0011] The dehumidifier is provided with an outdoor wet air inlet and an outdoor dry air outlet, the outdoor heat exchanger is provided with an outdoor dry air inlet, and the outdoor dry air outlet of the dehumidifier is connected to the outdoor dry air inlet of the outdoor heat exchanger; the regenerator is provided with a water vapor outlet, and the water vapor outlet is communicated with the outdoor low-temperature environment.

[0012] The air source heat pump solution dehumidification and frost suppression system of the present invention enables the outdoor heat exchanger to exchange heat with outdoor dry air through the continuous execution of solution dehumidification cycle and solution regeneration cycle, thereby avoiding the occurrence of frosting; the dehumidification solution regeneration heat source chooses to use the inevitable waste heat generated when the compressor of the air source heat pump is running for regeneration, so that low-grade energy is utilized, the energy utilization rate is improved, and the energy consumption and cost are reduced.

[0013] Furthermore, the outdoor heat exchanger is an air-cooled heat exchanger, and an outdoor fan is installed between the dehumidifier and the outdoor heat exchanger.

[0014] Furthermore, the dehumidifier and the regenerator are both composed of hollow fiber membrane components.

[0015] Furthermore, the hollow fiber membrane assembly includes hydrophobic fiber filaments having water vapor selective permeability and a hollow inner cavity.

[0016] Furthermore, the dehumidification solution in the dehumidifier and the regenerator flows through the hollow fiber membrane module pipe line, and the dehumidifier is provided with an outdoor wet air inlet and an outdoor dry air outlet. The outdoor wet air enters the dehumidifier from the outdoor wet air inlet and passes through the hollow fiber membrane module, and then flows out from the outdoor dry air outlet.

[0017] Furthermore, the heat storage device contains phase change heat storage material and heat exchange tubes, and the phase change heat storage material wraps the heat exchange tubes.

[0018] Furthermore, the heat exchange tube is a pipe with good thermal conductivity and resistance to corrosion by the dehumidification solution.

[0019] Furthermore, the first liquid storage tank and the second liquid storage tank are filled with dehumidification solution, and the shells of the first liquid storage tank and the second liquid storage tank are structures that are resistant to corrosion by the dehumidification solution and have good thermal conductivity.

[0020] Furthermore, the dehumidification solution is a dehumidification solution that does not crystallize within a temperature range of 0° to 20° and does not crystallize at a phase change temperature of the phase change thermal storage material and an initial solution concentration.

[0021] The present invention also provides an air source heat pump solution dehumidification and frost suppression method, which is applied to the above-mentioned air source heat pump solution dehumidification and frost suppression system, and includes the following processes: adjusting the first three-way valve, the second three-way valve, the third three-way valve and the fourth three-way valve, so that the first three-way valve and the second three-way valve are connected to the dehumidifier, the first liquid storage tank and the first solution pump, and the concentrated dehumidification solution in the first liquid storage tank passes through the second three-way valve and the first solution pump in sequence and enters the dehumidifier, and the concentrated dehumidification solution absorbs water vapor in the outdoor humid air entering the dehumidifier, and the outdoor dry air dehumidified by the dehumidifier enters the outdoor heat exchanger to exchange heat with the low-temperature and low-pressure refrigerant liquid, and the dehumidification solution with reduced concentration passes through the first three-way valve The refrigerant enters the first liquid storage tank and mixes with the dehumidification solution in the first liquid storage tank; the low-temperature and low-pressure refrigerant vapor is compressed by the compressor to obtain high-temperature and high-pressure refrigerant vapor, and the heat storage device absorbs and stores the waste heat of the compressor; the high-temperature and high-pressure refrigerant vapor enters the indoor heat exchanger through the four-way reversing valve to exchange heat with the air and condense into low-temperature and high-pressure refrigerant liquid, and the indoor air temperature rises to complete the heating; the low-temperature and high-pressure refrigerant liquid is throttled and reduced in pressure by the throttle valve to become a low-temperature and low-pressure refrigerant liquid, and then enters the outdoor heat exchanger to exchange heat with the outdoor air dried by the dehumidifier to become a low-temperature and low-pressure refrigerant vapor; the concentration of the concentrated dehumidification solution in the first liquid storage tank is reduced to a dilute dehumidification solution of a preset concentration After that, adjust the first three-way valve, the second three-way valve, the third three-way valve and the fourth three-way valve, so that the first three-way valve 22 and the second three-way valve are connected to the dehumidifier, the second liquid storage tank and the first solution pump, the third three-way valve and the fourth three-way valve are connected to the heat storage tank, the first liquid storage tank and the second solution pump, the concentrated dehumidification solution in the second liquid storage tank passes through the second three-way valve and the first solution pump in sequence and enters the dehumidifier, the concentrated dehumidification solution absorbs the water vapor in the outdoor wet air entering the dehumidifier, the outdoor dry air enters the outdoor heat exchanger to exchange heat with the low-temperature and low-pressure refrigerant liquid, and the dehumidification solution with reduced concentration enters the second liquid storage tank through the first three-way valve and is mixed with the dehumidification solution in the second liquid storage tank; The dilute dehumidification solution in a liquid storage tank enters the heat storage tank through the third three-way valve and absorbs the energy stored in the heat storage tank. The high-temperature dilute dehumidification solution flows out of the heat storage tank and enters the regenerator. Since the surface water vapor pressure of the high-temperature dilute dehumidification solution is greater than the water vapor pressure of the outdoor air, the water vapor in the dilute dehumidification solution escapes into the outdoor environment through the water vapor outlet of the regenerator. The high-temperature dehumidification solution with increased concentration flows out of the regenerator and passes through the second solution pump and the fourth three-way valve in turn into the first liquid storage tank. When the concentration of the dehumidification solution in the first liquid storage tank reaches a preset concentration, the second solution pump is turned off, and the high-temperature concentrated dehumidification solution is cooled to a low-temperature concentrated dehumidification solution in the first liquid storage tank.When the concentration of the concentrated dehumidification solution in the second liquid storage tank is reduced to a dilute dehumidification solution of a preset concentration, the first three-way valve, the second three-way valve, the third three-way valve and the fourth three-way valve are adjusted so that the first three-way valve and the second three-way valve are connected to the dehumidifier, the first liquid storage tank and the first solution pump, and the third three-way valve and the fourth three-way valve are connected to the heat storage, the second liquid storage tank and the second solution pump. The concentrated dehumidification solution in the first liquid storage tank passes through the second three-way valve and the first solution pump in sequence and enters the dehumidifier. The concentrated dehumidification solution absorbs water vapor in the outdoor humid air entering the dehumidifier, and the outdoor dry air enters the outdoor heat exchanger to exchange heat with the low-temperature and low-pressure refrigerant liquid. The dehumidification solution with reduced concentration enters the first liquid storage tank through the first three-way valve and is mixed with the dehumidification solution in the first liquid storage tank; the dilute dehumidification solution in the second liquid storage tank passes through the third three-way valve and the fourth three-way valve. The high-temperature dilute dehumidification solution flows out of the heat storage tank 32 and absorbs the energy stored in the heat storage tank. The high-temperature dilute dehumidification solution flows out of the heat storage tank and enters the regenerator. Since the surface water vapor pressure of the high-temperature dilute dehumidification solution is greater than the water vapor pressure of the outdoor air, the water vapor in the dilute dehumidification solution escapes into the outdoor environment through the water vapor outlet of the regenerator. The high-temperature dehumidification solution with increased concentration flows out of the regenerator and passes through the second solution pump and the fourth three-way valve in turn into the second liquid storage tank; when the concentration of the dehumidification solution in the second liquid storage tank reaches the preset concentration, the second solution pump is turned off, and the high-temperature concentrated dehumidification solution is cooled to a low-temperature concentrated dehumidification solution in the second liquid storage tank; the above operation is repeated to adjust the first three-way valve, the second three-way valve, the third three-way valve and the fourth three-way valve to realize the refrigerant cycle, the solution dehumidification cycle and the solution regeneration cycle. ;

[0022] The air source heat pump solution dehumidification and frost inhibition method of the present invention alternately enters the solution dehumidification cycle through the first liquid storage tank and the second liquid storage tank, and uses the heat storage device to store the waste heat generated by the compressor during the refrigerant cycle for regenerating the dehumidification solution, so that the solution dehumidification cycle and the solution regeneration cycle are continuously carried out, so that the outdoor heat exchanger can exchange heat with the dehumidified outdoor dry air to avoid the occurrence of frosting, and the dehumidification solution is regenerated through the inevitable waste heat generated when the compressor is running, thereby improving energy utilization and reducing energy consumption and cost.

[0023] Compared with the background technology, the air source heat pump solution dehumidification and frost suppression system and method of the present invention have the following beneficial effects:

[0024] The air can be dehumidified conveniently and the dehumidification solution can be regenerated, thus improving energy utilization and reducing energy consumption and cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a structural schematic diagram of an air source heat pump solution dehumidification and frost suppression system in an embodiment of the present invention;

[0026] Figure 2 It is a structural schematic diagram of a dehumidifier in an embodiment of the present invention;

[0027] Figure 3 A schematic diagram of the structure of a regenerator in an embodiment of the present invention;

[0028] Figure 4 Schematic diagram of the structure of the heat storage device in an embodiment of the present invention.

[0029] In the attached drawings: 1-refrigerant circulation loop; 11-compressor; 12-four-way reversing valve; 13-indoor heat exchanger; 14-throttle valve; 15-outdoor heat exchanger; 2-solution dehumidification circulation loop; 21-dehumidifier; 211-low-temperature concentrated dehumidification solution inlet; 212-low-temperature dilute dehumidification solution outlet; 22-first three-way valve; 23-first liquid storage tank; 24-second liquid storage tank; 25-second three-way valve; 26-first solution pump; 3-solution regeneration circulation loop; 31-third three-way valve; 32-heat storage tank; 321-heat exchange tube; 33-regenerator; 331-high-temperature dilute dehumidification solution inlet; 332-high-temperature concentrated dehumidification solution outlet; 34-second solution pump; 35-fourth three-way valve; 4-hollow fiber membrane module; 5-outdoor fan; DETAILED DESCRIPTION

[0030] The present invention is further described below in conjunction with specific implementation methods. The accompanying drawings are only used for exemplary descriptions and are only schematic diagrams, not actual drawings, and cannot be understood as limiting this patent; in order to better illustrate the embodiments of the present invention, some parts of the accompanying drawings may be omitted, enlarged or reduced, and do not represent the size of the actual product; for those skilled in the art, it is understandable that some well-known structures and their descriptions in the accompanying drawings may be omitted.

[0031] The same or similar numbers in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if the terms "upper", "lower", "left", "right" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the drawings, it is 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 direction, be constructed and operated in a specific direction. Therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and cannot be understood as limitations on this patent. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0032] Embodiment 1

[0033] An air source heat pump solution dehumidification and frost suppression system, such as Figure 1 As shown, it includes a refrigerant circulation circuit 1, a solution dehumidification circulation circuit 2 and a solution regeneration circulation circuit 3;

[0034] The refrigerant circulation circuit 1 includes a compressor 11, a four-way reversing valve 12, an indoor heat exchanger 13, a throttle valve 14 and an outdoor heat exchanger 15. The output end of the compressor 11 is connected to the input end of the indoor heat exchanger 13 through the four-way reversing valve 12, the output end of the indoor heat exchanger 13 is connected to the input end of the outdoor heat exchanger 15 through the throttle valve 14, and the output end of the outdoor heat exchanger 15 is connected to the input end of the compressor 11 through the four-way reversing valve 12.

[0035] The solution dehumidification circulation loop 2 includes a dehumidifier 21, a first three-way valve 22, a first liquid storage tank 23, a second liquid storage tank 24, a second three-way valve 25 and a first solution pump 26; the first liquid storage tank 23 and the second liquid storage tank 24 are both provided with a low-temperature dilute dehumidification solution inlet and a low-temperature concentrated dehumidification solution outlet, the two low-temperature dilute dehumidification solution inlets are respectively connected to the output end of the dehumidifier 21 through the first three-way valve 22, the two low-temperature concentrated dehumidification solution outlets are respectively connected to the input end of the first solution pump 26 through the second three-way valve 25, and the output end of the first solution pump 26 is connected to the input end of the dehumidifier 21;

[0036] The solution regeneration circulation loop 3 includes a heat reservoir 32, a regenerator 33, a second solution pump 34, a third three-way valve 31, a fourth three-way valve 35, and a first liquid storage tank 23 and a second liquid storage tank 24. The compressor 11 is a closed compressor 11. The heat reservoir 32 is installed on the outer wall of the compressor 11. The first liquid storage tank 23 and the second liquid storage tank 24 are both provided with a low-temperature dilute dehumidification solution outlet 212 and a high-temperature concentrated dehumidification solution inlet. The two low-temperature dilute dehumidification solution outlets 212 are connected to the input end of the heat reservoir 32 through the third three-way valve 31, the output end of the heat reservoir 32 is connected to the input end of the regenerator 33, the output end of the regenerator 33 is connected to the input end of the second solution pump 34, and the two high-temperature concentrated dehumidification solution inlets are connected to the output end of the second solution pump 34 through the fourth three-way valve 35;

[0037] The dehumidifier 21 is provided with an outdoor wet air inlet and an outdoor dry air outlet, the outdoor heat exchanger 15 is provided with an outdoor dry air inlet, and the outdoor dry air outlet of the dehumidifier 21 is connected to the outdoor dry air inlet of the outdoor heat exchanger 15; the regenerator 33 is provided with a water vapor outlet, and the water vapor outlet is communicated with the outdoor low temperature environment.

[0038] In the above-mentioned air source heat pump solution dehumidification and frost suppression system, in the refrigerant cycle, the low-temperature and low-pressure refrigerant vapor is compressed by the compressor 11 to obtain high-temperature and high-pressure refrigerant vapor, and the heat storage tank 32 installed on the outer wall of the compressor 11 absorbs and stores the waste heat generated when the compressor 11 is running; the high-temperature and high-pressure refrigerant vapor enters the indoor heat exchanger 13 through the four-way reversing valve 12, exchanges heat with the indoor air in the indoor heat exchanger 13, and the high-temperature and high-pressure refrigerant vapor is condensed into a low-temperature and high-pressure refrigerant liquid, and the low-temperature and high-pressure refrigerant vapor coming out of the indoor heat exchanger 13 is condensed into a low-temperature and high-pressure refrigerant liquid. The refrigerant liquid is depressurized by the throttle valve 14 to become a low-temperature, low-pressure refrigerant liquid, and the low-temperature, low-pressure refrigerant liquid enters the outdoor heat exchange chamber. The outdoor air dried by the dehumidifier 21 enters the outdoor heat exchanger 15. In the outdoor heat exchanger 15, the low-temperature, low-pressure refrigerant liquid exchanges heat with the outdoor dry air to become a low-temperature, low-pressure refrigerant vapor. The low-temperature, low-pressure refrigerant vapor coming out of the outdoor heat exchanger 15 enters the compressor 11 through the four-way reversing valve 12. In the solution dehumidification cycle, the first The three-way valve 22 and the second three-way valve 25 connect the dehumidifier 21, the first liquid storage tank 23 and the first solution pump 26. In the solution regeneration cycle, the third three-way valve 31 and the fourth three-way valve 35 connect the heat storage tank 32, the second liquid storage tank 24 and the second solution pump 34. After a certain period of time, the first three-way valve 22, the second three-way valve 25, the third three-way valve 31 and the fourth three-way valve 35 switch the pipeline. In the solution dehumidification cycle, the first three-way valve 22 and the second three-way valve 25 connect the dehumidifier 21, the second liquid storage tank 24 and the first solution pump 26. In the solution regeneration cycle, the third three-way valve 31 and the fourth three-way valve 35 connect the heat storage 32, the first liquid storage tank 23 and the second solution pump 34. The first three-way valve 22, the second three-way valve 25, the third three-way valve 31 and the fourth three-way valve 35 periodically switch the pipeline. In the first cycle, the second liquid storage tank 24 is in the solution regeneration circulation loop 3. However, since the concentrated dehumidification solution is stored in the second liquid storage tank 24 at the beginning, no regeneration is required. Therefore, the second solution pump 34 is closed in the first cycle until it is opened at the beginning of the second cycle. In this embodiment, the outdoor heat exchanger 15 can exchange heat with the outdoor dry air through the continuous dehumidification and regeneration of the solution, avoiding the occurrence of frosting. In the dehumidification solution regeneration heat source, the inevitable waste heat of the compressor 11 of the air source heat pump is selected for regeneration, so that low-grade energy is utilized, the energy utilization rate is improved, and the energy loss and cost are reduced.

[0039] The outdoor heat exchanger 15 is an air-cooled heat exchanger, and an outdoor fan 5 is installed between the dehumidifier 21 and the outdoor heat exchanger 15 to improve the heat exchange efficiency.

[0040] Embodiment 2

[0041] This embodiment is similar to the first embodiment, except that Figures 2 to 4As shown, the dehumidifier 21 and the regenerator 33 are both composed of a hollow fiber membrane assembly 4, the heat storage 32 is filled with a phase change heat storage material and a heat exchange tube 321, the phase change heat storage material wraps the heat exchange tube 321, and the dehumidifier 21 is provided with a low-temperature concentrated dehumidification solution inlet 211 connected to the first solution pump 26 and a low-temperature dilute dehumidification solution outlet 212 connected to the first three-way valve 22, and the regenerator 33 is provided with a high-temperature dilute dehumidification solution inlet 331 connected to the heat exchange tube 321 and a high-temperature concentrated dehumidification solution outlet 332 connected to the second solution pump 34. The hollow fiber membrane assembly 4 includes hydrophobic fiber filaments with water vapor selective permeability and a hollow inner cavity, and the raw materials of the fiber filaments include but are not limited to polypropylene, polyvinylidene fluoride or polytetrafluoroethylene. The dehumidification solution in the dehumidifier 21 and the regenerator 33 passes through the hollow fiber membrane module 4 pipe. The dehumidifier 21 is provided with an outdoor wet air inlet and an outdoor dry air outlet. The outdoor wet air enters the dehumidifier 21 from the outdoor wet air inlet and sweeps through the hollow fiber membrane module 4, and then escapes from the outdoor dry air outlet.

[0042] The heat exchange tube 321 is a pipe with good thermal conductivity and resistance to corrosion by the dehumidification solution.

[0043] The phase change heat storage material has a phase change temperature of not less than 40°, good thermal conductivity, and a structure with a large heat capacity in the phase change section.

[0044] The first liquid storage tank 23 and the second liquid storage tank 24 are filled with dehumidification solution, and the shells of the first liquid storage tank 23 and the second liquid storage tank 24 are structures resistant to corrosion by the dehumidification solution.

[0045] The dehumidification solution is a dehumidification solution that does not crystallize within a temperature range of 0° to 20° and does not crystallize at the phase change temperature of the phase change thermal storage material and the initial solution concentration.

[0046] Specifically, the dehumidifier 21 and the regenerator 33 are both composed of a PTFE hollow fiber membrane assembly 4, the phase change heat storage material is a porous aluminum / paraffin composite phase change material, the heat exchange tube 321 is a corrosion-resistant stainless steel pipe, and the dehumidification solution is a lithium chloride salt solution.

[0047] In this embodiment, the air flowing through the outdoor heat exchanger 15 is dehumidified by the dehumidifier 21 based on the hollow fiber membrane module 4 to prevent the air source heat pump from frosting. The closed solution cycle effectively prevents the outdoor environmental impurities from polluting the dehumidification solution. According to the specific relative humidity of the air in different regions, dehumidification can be performed by adjusting the number and arrangement of the hollow fiber membrane tubes of the hollow fiber membrane module 4. The dehumidification capacity is flexible and wide. In addition, the cost of the hollow fiber membrane module 4 used for solution dehumidification and regeneration in this embodiment is low, and the size of the hollow fiber membrane module 4 is relatively small, easy to arrange, and flexible to adjust.

[0048] Embodiment 3

[0049] The present embodiment is a solution dehumidification method and a solution regeneration method for the air source heat pump solution dehumidification and frost suppression system applied to the second embodiment. Specifically, in the refrigerant cycle, the first three-way valve 22, the second three-way valve 25, the third three-way valve 31 and the fourth three-way valve 35 are adjusted so that the first three-way valve 22 and the second three-way valve 25 are connected to the dehumidifier 21, the first liquid storage tank 23 and the first solution pump 26. The concentrated dehumidification solution in the first liquid storage tank 23 passes through the second three-way valve 25 and the first solution pump 26 in sequence and enters the dehumidifier 21. The concentrated dehumidification solution absorbs water vapor in the outdoor wet air entering the dehumidifier 21. The outdoor dry air dehumidified by the dehumidifier 21 enters the outdoor heat exchanger 15 to exchange heat with the low-temperature and low-pressure refrigerant liquid. The dehumidification solution with reduced concentration passes through the first three-way valve 22. It enters the first liquid storage tank 23 and mixes with the dehumidification solution in the first liquid storage tank 23; the low-temperature and low-pressure refrigerant vapor is compressed by the compressor 11 to obtain high-temperature and high-pressure refrigerant vapor, and the heat storage device 32 absorbs and stores the waste heat of the compressor 11; the high-temperature and high-pressure refrigerant vapor enters the indoor heat exchanger 13 through the four-way reversing valve 12 to exchange heat with the air and condense into low-temperature and high-pressure refrigerant liquid, and the indoor air temperature rises to complete the heating; the low-temperature and high-pressure refrigerant liquid is throttled and reduced in pressure by the throttle valve 14 to become a low-temperature and low-pressure refrigerant liquid, and then enters the outdoor heat exchanger 15 to exchange heat with the outdoor air dried by the dehumidifier 21 to become a low-temperature and low-pressure refrigerant vapor, and the low-temperature and low-pressure refrigerant vapor coming out of the outdoor heat exchanger 15 enters the compressor 11 through the four-way reversing valve 12 to complete the refrigerant cycle.

[0050] When the dehumidifier 21 is dehumidifying the outdoor wet air, the concentration of the concentrated dehumidification solution in the first liquid storage tank 23 decreases. When the concentration of the concentrated dehumidification solution in the first liquid storage tank 23 decreases to a dilute dehumidification solution with a preset concentration, the first three-way valve 22, the second three-way valve 25, the third three-way valve 31 and the fourth three-way valve 35 are adjusted to connect the first three-way valve 22 and the second three-way valve 25 to the dehumidifier 21, the second liquid storage tank 24 and the first solution pump 26, and the third three-way valve 31 and the fourth three-way valve 35 to the heat storage tank 32, the first liquid storage tank 23 and the second solution pump 34. The concentrated dehumidification solution in the second liquid storage tank 24 enters the dehumidifier 21 through the second three-way valve 25 and the first solution pump 26 in sequence. The concentrated dehumidification solution absorbs water vapor in the outdoor wet air entering the dehumidifier 21, and the indoor The external dry air enters the outdoor heat exchanger 15 to exchange heat with the low-temperature and low-pressure refrigerant liquid. The dehumidification solution with reduced concentration enters the second liquid storage tank 24 through the first three-way valve 22 and mixes with the dehumidification solution in the second liquid storage tank 24; the dilute dehumidification solution in the first liquid storage tank 23 enters the heat storage tank 32 through the third three-way valve 31 and absorbs the energy stored in the heat storage tank 32, and the high-temperature dilute dehumidification solution flows out of the heat storage tank 32 and enters the regenerator 33. Since the surface water vapor pressure of the high-temperature dilute dehumidification solution is greater than the water vapor pressure of the outdoor air, the water vapor in the dilute dehumidification solution escapes into the outdoor environment through the water vapor outlet of the regenerator 33, and the high-temperature dehumidification solution with increased concentration flows out of the regenerator 33 and passes through the second solution pump 34 and the fourth three-way valve 35 in turn into the first liquid storage tank 23.

[0051] The time required for the solution regeneration to be completed is less than the time for the dehumidification solution in the second liquid storage tank 24 to be continuously dehumidified. When the concentration of the dehumidification solution in the first liquid storage tank 23 reaches a preset concentration, the second solution pump 34 is closed, and the high-temperature concentrated dehumidification solution is cooled to a low-temperature concentrated dehumidification solution in the first liquid storage tank 23. When the concentration of the concentrated dehumidification solution in the second liquid storage tank 24 is reduced to a dilute dehumidification solution with a preset concentration, the first three-way valve 22, the second three-way valve 25, the third three-way valve 31 and the fourth three-way valve 35 are adjusted so that the first three The first three-way valve 22 and the second three-way valve 25 are connected to the dehumidifier 21, the first liquid storage tank 23 and the first solution pump 26, the third three-way valve 31 and the fourth three-way valve 35 are connected to the heat storage tank 32, the second liquid storage tank 24 and the second solution pump 34, and the concentrated dehumidification solution in the first liquid storage tank 23 passes through the second three-way valve 25 and the first solution pump 26 in sequence and enters the dehumidifier 21, and the concentrated dehumidification solution absorbs the water vapor in the outdoor wet air entering the dehumidifier 21, and the outdoor dry air enters the outdoor heat exchanger 15 and the low temperature and low pressure Refrigerant liquid heat exchange, the dehumidification solution with reduced concentration enters the first liquid storage tank 23 through the first three-way valve 22 and mixes with the dehumidification solution in the first liquid storage tank 23; the dilute dehumidification solution in the second liquid storage tank 24 enters the heat storage tank 32 through the third three-way valve 31 and absorbs the energy stored in the heat storage tank 32, and the high-temperature dilute dehumidification solution flows out from the heat storage 32 and enters the regenerator 33. Since the surface water vapor pressure of the high-temperature dilute dehumidification solution is greater than the water vapor pressure of the outdoor air, the water vapor in the dilute dehumidification solution escapes to the outdoor environment through the water vapor outlet of the regenerator 33, and the high-temperature dehumidification solution with increased concentration flows out of the regenerator 33 and passes through the second solution pump 34 and the fourth three-way valve 35 in turn into the second liquid storage tank 24; the time required for solution regeneration to complete is less than the continuous dehumidification time of the dehumidification solution in the first liquid storage tank 23. When the concentration of the dehumidification solution in the second liquid storage tank 24 reaches a preset concentration, the second solution pump 34 is turned off, and the high-temperature concentrated dehumidification solution is cooled to a low-temperature concentrated dehumidification solution in the second liquid storage tank 24;

[0052] Due to the periodic switching of the pipeline, the dehumidification and regeneration of the solution are continuously performed, so that the outdoor heat exchanger 15 can exchange heat with the outdoor dry air to avoid the occurrence of frosting.

[0053] In the specific contents of the above-mentioned specific implementation methods, the various technical features can be combined in any non-contradictory manner. In order to make the description concise, not all possible combinations of the above-mentioned technical features are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0054] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. An air source heat pump solution dehumidification and frost suppression system, characterized in that: It comprises a refrigerant circulation circuit (1), a solution dehumidification circulation circuit (2) and a solution regeneration circulation circuit (3); The refrigerant circulation circuit (1) comprises a compressor (11), a four-way reversing valve (12), an indoor heat exchanger (13), a throttle valve (14) and an outdoor heat exchanger (15); the output end of the compressor (11) is connected to the input end of the indoor heat exchanger (13) via the four-way reversing valve (12); the output end of the indoor heat exchanger (13) is connected to the input end of the outdoor heat exchanger (15) via the throttle valve (14); and the output end of the outdoor heat exchanger (15) is connected to the input end of the compressor (11) via the four-way reversing valve (12); The solution dehumidification circulation loop (2) comprises a dehumidifier (21), a first three-way valve (22), a first liquid storage tank (23), a second liquid storage tank (24), a second three-way valve (25) and a first solution pump (26); the first liquid storage tank (23) and the second liquid storage tank (24) are both provided with a low-temperature dilute dehumidification solution inlet and a low-temperature concentrated dehumidification solution outlet, the two low-temperature dilute dehumidification solution inlets are respectively connected to the output end of the dehumidifier (21) through the first three-way valve (22), the two low-temperature concentrated dehumidification solution outlets are respectively connected to the input end of the first solution pump (26) through the second three-way valve (25), and the output end of the first solution pump (26) is connected to the input end of the dehumidifier (21); The solution regeneration circulation loop (3) comprises a heat reservoir (32), a regenerator (33), a second solution pump (34), a third three-way valve (31), a fourth three-way valve (35), and the first liquid storage tank (23) and the second liquid storage tank (24); the compressor (11) is a closed compressor (11); the heat reservoir (32) is mounted on the outer wall of the compressor (11); the first liquid storage tank (23) and the second liquid storage tank (24) are both provided with a low-temperature dilute dehumidification solution outlet (212) and a high-temperature concentrated dehumidification solution inlet; the two low-temperature dilute dehumidification solution outlets (212) are connected to the input end of the heat reservoir (32) through the third three-way valve (31); the output end of the heat reservoir (32) is connected to the input end of the regenerator (33); the output end of the regenerator (33) is connected to the input end of the second solution pump (34); and the two high-temperature concentrated dehumidification solution inlets are connected to the output end of the second solution pump (34) through the fourth three-way valve (35); The dehumidifier (21) is provided with an outdoor wet air inlet and an outdoor dry air outlet, the outdoor heat exchanger (15) is provided with an outdoor dry air inlet, and the outdoor dry air outlet of the dehumidifier (21) is connected to the outdoor dry air inlet of the outdoor heat exchanger (15); the regenerator (33) is provided with a water vapor outlet, and the water vapor outlet is communicated with an outdoor low-temperature environment.

2. The air source heat pump solution dehumidification and frost suppression system according to claim 1, characterized in that: The dehumidifier (21) and the regenerator (33) are both composed of hollow fiber membrane modules (4).

3. The air source heat pump solution dehumidification and frost suppression system according to claim 2, characterized in that: The hollow fiber membrane component (4) comprises hydrophobic fiber filaments having water vapor selective permeability and a hollow inner cavity.

4. The air source heat pump solution dehumidification and frost suppression system according to claim 2, characterized in that: The dehumidification solution in the dehumidifier (21) and the regenerator (33) flows through the hollow fiber membrane module (4) pipe. The dehumidifier (21) is provided with an outdoor wet air inlet and an outdoor dry air outlet. The outdoor wet air enters the dehumidifier (21) from the outdoor wet air inlet and passes through the hollow fiber membrane module (4), and then flows out from the outdoor dry air outlet.

5. The air source heat pump solution dehumidification and frost suppression system according to claim 1, characterized in that: The outdoor heat exchanger (15) is an air-cooled heat exchanger, and an outdoor fan (5) is installed between the dehumidifier (21) and the outdoor heat exchanger (15).

6. The air source heat pump solution dehumidification and frost suppression system according to any one of claims 1 to 5, characterized in that: The heat storage device (32) contains a phase-change heat storage material and a heat exchange tube (321), and the phase-change heat storage material wraps the heat exchange tube (321).

7. The air source heat pump solution dehumidification and frost suppression system according to claim 6, characterized in that: The heat exchange tube (321) is a pipe with good thermal conductivity and resistance to corrosion by the dehumidification solution.

8. The air source heat pump solution dehumidification and frost suppression system according to claim 6, characterized in that The first liquid storage tank (23) and the second liquid storage tank (24) contain dehumidification solution, and the shells of the first liquid storage tank (23) and the second liquid storage tank (24) are structures that are resistant to corrosion by the dehumidification solution and have good thermal conductivity.

9. The air source heat pump solution dehumidification and frost suppression system according to claim 8, characterized in that: The dehumidification solution is a dehumidification solution that does not crystallize within a temperature range of 0° to 20° and does not crystallize at a phase change temperature of the phase change heat storage material and an initial solution concentration.

10. An air source heat pump solution dehumidification and frost suppression method, applied to the air source heat pump solution dehumidification and frost suppression system according to any one of claims 1 to 9, characterized in that: The process includes: The first three-way valve (22), the second three-way valve (25), the third three-way valve (31) and the fourth three-way valve (35) are adjusted so that the first three-way valve (22) and the second three-way valve (25) are connected to the dehumidifier (21), the first liquid storage tank (23) and the first solution pump (26), and the concentrated dehumidification solution in the first liquid storage tank (23) enters the dehumidifier (21) through the second three-way valve (25) and the first solution pump (26) in sequence, and the concentrated dehumidification solution absorbs water vapor in the outdoor wet air entering the dehumidifier (21), and the outdoor dry air dehumidified by the dehumidifier (21) enters the outdoor heat exchanger (15) to exchange heat with the low-temperature and low-pressure refrigerant liquid, and the dehumidification solution with reduced concentration enters the first liquid storage tank (23) through the first three-way valve (22) and mixes with the dehumidification solution in the first liquid storage tank (23); After low-temperature and low-pressure refrigerant vapor is compressed by the compressor (11), high-temperature and high-pressure refrigerant vapor is obtained. The heat storage device (32) absorbs and stores the waste heat of the compressor (11); the high-temperature and high-pressure refrigerant vapor enters the indoor heat exchanger (13) through the four-way reversing valve (12) to exchange heat with the air and condense into low-temperature and high-pressure refrigerant liquid, and the indoor air temperature rises to complete heating; the low-temperature and high-pressure refrigerant liquid is throttled and reduced in pressure by the throttle valve (14) to become low-temperature and low-pressure refrigerant liquid, and then enters the outdoor heat exchanger (15) to exchange heat with the outdoor air dried by the dehumidifier (21) to become low-temperature and low-pressure refrigerant vapor. The low-temperature and low-pressure refrigerant vapor coming out of the outdoor heat exchanger (15) enters the compressor (11) through the four-way reversing valve (12), completing the refrigerant cycle; After the concentration of the concentrated dehumidifying solution in the first liquid storage tank (23) is reduced to a dilute dehumidifying solution of a preset concentration, the first three-way valve (22), the second three-way valve (25), the third three-way valve (31) and the fourth three-way valve (35) are adjusted so that the first three-way valve (22) and the second three-way valve (25) are connected to the dehumidifier (21), the second liquid storage tank (24) and the first solution pump (26), and the third three-way valve (31) and the fourth three-way valve (35) are connected to the heat storage tank (32), the first liquid storage tank (23) and the second solution pump (26). The concentrated dehumidifying solution in the second liquid storage tank (24) passes through the second three-way valve (25) and the first solution pump (26) in sequence and enters the dehumidifier (21). The concentrated dehumidifying solution absorbs water vapor in the outdoor humid air entering the dehumidifier (21). The outdoor dry air enters the outdoor heat exchanger (15) to exchange heat with the low-temperature and low-pressure refrigerant liquid. The dehumidifying solution with reduced concentration passes through the first three-way valve (22) and enters the second liquid storage tank (24) to mix with the dehumidifying solution in the second liquid storage tank (24). The dilute dehumidification solution in the first liquid storage tank (23) passes through the third three-way valve (31) into the heat storage tank (32) and absorbs the energy stored in the heat storage tank (32). The high-temperature dilute dehumidification solution flows out of the heat storage tank (32) and enters the regenerator (33). Since the surface water vapor pressure of the high-temperature dilute dehumidification solution is greater than the water vapor pressure of the outdoor air, the water vapor in the dilute dehumidification solution escapes into the outdoor environment through the water vapor outlet of the regenerator (33). The high-temperature dehumidification solution with increased concentration flows out of the regenerator (33) and passes through the second solution pump (34) and the fourth three-way valve (35) in sequence into the first liquid storage tank (23). When the concentration of the dehumidifying solution in the first liquid storage tank (23) reaches a preset concentration, the second solution pump (34) is closed, and the high-temperature concentrated dehumidifying solution is cooled to a low-temperature concentrated dehumidifying solution in the first liquid storage tank (23); when the concentration of the concentrated dehumidifying solution in the second liquid storage tank (24) is reduced to a dilute dehumidifying solution of a preset concentration, the first three-way valve (22), the second three-way valve (25), the third three-way valve (31) and the fourth three-way valve (35) are adjusted so that the first three-way valve (22) and the second three-way valve (25) are connected to the dehumidifier (21), the first liquid storage tank (23) and the first solution pump (26), and the third three-way valve (31) and the fourth three-way valve (35) are connected to the heat storage tank (32), the second liquid storage tank (24) and the second solution pump (34), and the concentrated dehumidifying solution in the first liquid storage tank (23) passes through the second three-way valve (25) and the first solution pump (26) in sequence and enters the dehumidifier (21), and the concentrated dehumidifying solution enters the dehumidifier. The water vapor in the outdoor wet air in the heat exchanger (21) is removed, and the outdoor dry air enters the outdoor heat exchanger (15) to exchange heat with the low-temperature and low-pressure refrigerant liquid. The dehumidification solution with reduced concentration enters the first liquid storage tank (23) through the first three-way valve (22) and mixes with the dehumidification solution in the first liquid storage tank (23); the dilute dehumidification solution in the second liquid storage tank (24) enters the heat storage tank (32) through the third three-way valve (31) and absorbs the energy stored in the heat storage tank (32). The high-temperature dilute dehumidification solution flows out of the heat storage tank (32) and enters the regenerator (33). Since the surface water vapor pressure of the high-temperature dilute dehumidification solution is greater than the water vapor pressure of the outdoor air, the water vapor in the dilute dehumidification solution escapes into the outdoor environment through the water vapor outlet of the regenerator (33). The high-temperature dehumidification solution with increased concentration flows out of the regenerator (33) and passes through the second solution pump (34) and the fourth three-way valve (35) in sequence and enters the second liquid storage tank (24); When the concentration of the dehumidification solution in the second liquid storage tank (24) reaches a preset concentration, the second solution pump (34) is turned off, and the high-temperature concentrated dehumidification solution is cooled to a low-temperature concentrated dehumidification solution in the second liquid storage tank (24); the above operation is repeated to adjust the first three-way valve (22), the second three-way valve (25), the third three-way valve (31) and the fourth three-way valve (35) to realize the refrigerant cycle, the solution dehumidification cycle and the solution regeneration cycle.

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