CN115289559B - Air source heat pump solution dehumidification and frost suppression system and method - Google Patents
Air source heat pump solution dehumidification and frost suppression system and method Download PDFInfo
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- CN115289559B CN115289559B CN202210872891.4A CN202210872891A CN115289559B CN 115289559 B CN115289559 B CN 115289559B CN 202210872891 A CN202210872891 A CN 202210872891A CN 115289559 B CN115289559 B CN 115289559B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F3/00—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems
- F24F3/12—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the treatment of the air otherwise than by heating and cooling
- F24F3/14—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the treatment of the air otherwise than by heating and cooling by humidification; by dehumidification
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/72—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
- F24F11/83—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers
- F24F11/84—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers using valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
- F24F13/20—Casings or covers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
- F24F13/30—Arrangement or mounting of heat-exchangers
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Central Air Conditioning (AREA)
Abstract
本发明涉及空调系统的技术领域，更具体地，涉及一种空气源热泵溶液除湿抑霜系统及方法，包括溶液除湿循环回路、溶液再生循环回路和制冷剂循环回路，通过溶液除湿循环以及溶液再生循环的不断进行，使得室外换热器能够与室外干燥空气进行换热，避免结霜现象的发生；在除湿溶液再生热源上选择了利用空气源热泵的压缩机不可避免的废热来进行再生，使得低品位的能源得到利用，提高了能量利用率，降低了能量消耗和成本。
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
The invention relates to the technical field of air conditioning systems, in particular to an air source heat pump solution dehumidifying and frost inhibiting system and method.
Background
The air source heat pump is widely applied because of the advantages of cooling and heating, energy conservation, environmental protection, low operation cost, safety, reliability and the like. However, the fin coil of the outdoor unit of the air source heat pump is easy to frost in a low-temperature and high-humidity environment, the air flow cross section area of the frosted fin tube type evaporator is reduced, the flow resistance and the heat transfer resistance are increased, the air flow and the evaporation temperature are reduced, and the heating performance and the efficiency of the heat pump are further reduced.
At present, in order to maintain the stable operation of the air source heat pump unit, methods such as reverse circulation defrosting, hot gas bypass, electric heating and the like are mostly adopted for defrosting and inhibiting frost, but the problems that the total efficiency of a system is reduced, the energy consumption of the system is high, the defrosting is uneven and the like caused by repeated defrosting exist, and the problem of frosting of the air source heat pump cannot be fundamentally solved. In recent years, some scholars have proposed various frostless air source heat pump systems successively, but the problem of solution regeneration or high energy consumption cannot be solved.
The prior art discloses a frostless air source heat pump system based on low pressure compressed solution regeneration, utilizes solution dehumidification drying evaporator inlet air, realizes air source heat pump frostless operation, utilizes low pressure compressed regenerator to carry out solution regeneration, and the vapor that evaporates becomes high temperature high pressure steam after the compressor compression and condenses in the regenerator, with the regeneration that full condensation heat recovery was used for diluting solution, reduces the regeneration temperature of solution, improves regeneration efficiency, but in this scheme, additional compressor has increased the energy consumption, and the cost is higher and the system is complicated.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, and provides a dehumidifying and frost-inhibiting system and method for an air source heat pump solution, which can conveniently dehumidify air and regenerate the dehumidified solution, thereby improving the energy utilization rate and reducing the energy consumption and the cost.
In order to solve the technical problems, the invention adopts the following technical scheme:
The air source heat pump solution dehumidifying and frost inhibiting system comprises a refrigerant circulation loop, a solution dehumidifying circulation loop and a solution regenerating circulation loop;
The refrigerating agent circulation loop comprises a compressor, a four-way reversing valve, an indoor heat exchanger, a throttle valve and an outdoor heat exchanger, wherein the output end of the compressor is connected with the input end of the indoor heat exchanger through the four-way reversing valve, the output end of the indoor heat exchanger is connected with the input end of the outdoor heat exchanger through the throttle valve, and the output end of the outdoor heat exchanger is connected with the input end of the compressor through the four-way reversing valve;
The solution dehumidification circulation loop comprises a dehumidifier, a first three-way valve, a first liquid storage tank, a second three-way valve and a first solution pump, wherein the first liquid storage tank and the second liquid storage tank are respectively provided with a low-temperature diluted dehumidification solution inlet and a low-temperature concentrated dehumidification solution outlet, the two low-temperature diluted dehumidification solution inlets are respectively connected with the output end of the dehumidifier through the first three-way valve, the two low-temperature concentrated dehumidification solution outlets are respectively connected with 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 with the input end of the dehumidifier;
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, a first solution storage tank and a second solution storage tank, wherein the compressor is a closed compressor, the heat reservoir is arranged on the outer wall of the compressor, the first solution storage tank and the second solution storage tank are respectively provided with a low-temperature diluted dehumidification solution outlet and a high-temperature concentrated dehumidification solution inlet, the two low-temperature diluted dehumidification solution outlets are connected with the input end of the heat reservoir through the third three-way valve, the output end of the heat reservoir is connected with the input end of the regenerator, the output end of the regenerator is connected with the input end of the second solution pump, and the two Gao Wennong dehumidification solution inlets are connected with the output end of the second solution pump through the fourth three-way valve;
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, the outdoor dry air outlet of the dehumidifier is connected with 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 an outdoor low-temperature environment.
The solution dehumidifying and frost inhibiting system of the air source heat pump enables the outdoor heat exchanger to exchange heat with outdoor dry air through the continuous execution of solution dehumidifying circulation and solution regenerating circulation, avoids the occurrence of frosting, and regenerates the dehumidified solution regenerating heat source by selecting unavoidable waste heat generated by the operation of a compressor of the air source heat pump, thereby utilizing low-grade energy, improving the energy utilization rate and reducing the energy consumption and the cost.
Further, the outdoor heat exchanger is an air-cooled heat exchanger, and an outdoor fan is arranged between the dehumidifier and the outdoor heat exchanger.
Further, the dehumidifier and the regenerator are both composed of hollow fiber membrane modules.
Further, the hollow fiber membrane module includes hydrophobic, water vapor permselective fiber filaments having hollow lumens.
Further, the dehumidifier and the regenerator are internally provided with an outdoor wet air inlet and an outdoor dry air outlet, and the outdoor wet air enters the dehumidifier from the outdoor wet air inlet and passes through the hollow fiber membrane assembly, and then flows out from the outdoor dry air outlet.
Further, the phase-change heat storage material and the heat exchange tube are arranged in the heat reservoir, and the phase-change heat storage material wraps the heat exchange tube.
Further, the heat exchange tube is a pipeline with good heat conducting performance and resistance to corrosion of dehumidification solution.
Further, dehumidification solution is filled in the first liquid storage tank and the second liquid storage tank, and the shells of the first liquid storage tank and the second liquid storage tank are of structures which are resistant to corrosion of the dehumidification solution and good in heat conducting performance.
Further, the dehumidifying solution is a dehumidifying solution which does not crystallize in a temperature range of 0-20 degrees and does not crystallize at the phase change temperature of the phase change heat storage material and the initial solution concentration.
The invention also provides a dehumidifying and frost-inhibiting method of the air source heat pump solution, which is applied to the dehumidifying and frost-inhibiting system of the air source heat pump solution and comprises the following steps of adjusting a first three-way valve, a second three-way valve, a third three-way valve and a fourth three-way valve to enable the first three-way valve and the second three-way valve to be connected with a dehumidifier, The system comprises a first liquid storage tank and a first solution pump, wherein concentrated dehumidification solution of the first liquid storage tank sequentially passes through a second three-way valve and the first solution pump to enter a dehumidifier, the concentrated dehumidification solution absorbs water vapor in outdoor wet air entering the dehumidifier, the outdoor dry air dehumidified by the dehumidifier enters an outdoor heat exchanger to exchange heat with low-temperature low-pressure refrigerant liquid, the dehumidification solution with reduced concentration enters the first liquid storage tank through the first three-way valve to be mixed with the dehumidification solution in the first liquid storage tank, the low-temperature low-pressure refrigerant vapor is compressed by a compressor to obtain high-temperature high-pressure refrigerant vapor, the heat storage device absorbs and stores waste heat of the compressor, the high-temperature high-pressure refrigerant vapor enters an indoor heat exchanger through a four-way reversing valve to exchange heat with air to be condensed into low-temperature high-pressure refrigerant liquid, the indoor air temperature is heated up, the low-temperature high-pressure refrigerant liquid is throttled and depressurized into low-temperature low-pressure refrigerant liquid through a throttle valve to enter the outdoor heat exchanger to exchange with the outdoor air dried by the dehumidifier into low-temperature low-pressure refrigerant vapor, the concentrated dehumidification solution of the first liquid with reduced concentration of the first liquid is diluted dehumidification solution with preset concentration, and the first three-way valve is adjusted, The second three-way valve, the third three-way valve and the fourth three-way valve are connected with the dehumidifier, the second liquid storage tank and the first solution pump, and the third three-way valve and the fourth three-way valve are connected with the heat reservoir, The system comprises a first liquid storage tank and a second solution pump, wherein a concentrated dehumidification solution in the second liquid storage tank sequentially passes through a second three-way valve and the first solution pump to enter a dehumidifier, the concentrated dehumidification solution absorbs water vapor in outdoor wet air entering the dehumidifier, outdoor dry air enters an outdoor heat exchanger to exchange heat with low-temperature low-pressure refrigerant liquid, the dehumidification solution with reduced concentration enters the second liquid storage tank through the first three-way valve to be mixed with the dehumidification solution in the second liquid storage tank, the diluted dehumidification solution in the first liquid storage tank enters a heat storage device through a third three-way valve and absorbs energy stored in the heat storage device, the high-temperature diluted dehumidification solution flows out of the heat storage device and enters a regenerator, the surface water vapor pressure of the high-temperature diluted dehumidification solution is larger than the water vapor pressure of outdoor air, the water vapor in the diluted dehumidification solution is dissipated to the outdoor environment through a water vapor outlet of the regenerator, the high-temperature dehumidification solution with increased concentration flows out of the regenerator sequentially through the second liquid storage tank and the fourth liquid storage tank, when the concentration of the dehumidification solution in the first liquid storage tank is high to reach a preset concentration, the second liquid storage tank is closed, the high-concentration diluted dehumidification solution in the first liquid storage tank is subjected to the first three-way valve is adjusted, and the high-concentration diluted dehumidification solution is concentrated after the first concentrated dehumidification solution is cooled down The second three-way valve, the third three-way valve and the fourth three-way valve are connected with 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 with the heat reservoir, The method comprises the steps of enabling concentrated dehumidification solution in a first liquid storage tank to sequentially pass through a first three-way valve and a first solution pump to enter a dehumidifier, enabling the concentrated dehumidification solution to absorb water vapor in outdoor wet air entering the dehumidifier, enabling outdoor dry air to enter an outdoor heat exchanger to exchange heat with low-temperature low-pressure refrigerant liquid, enabling the dehumidification solution with reduced concentration to enter the first liquid storage tank through the first three-way valve to be mixed with the dehumidification solution in the first liquid storage tank, enabling the diluted dehumidification solution in the second liquid storage tank to enter a heat storage device 32 through a third three-way valve and absorb energy stored in the heat storage device, enabling the high-temperature diluted dehumidification solution to flow out of the heat storage device and enter a regenerator, enabling the surface water vapor pressure of the high-temperature diluted dehumidification solution to be larger than that of outdoor air, enabling the water vapor in the diluted dehumidification solution to be dissipated to the outdoor environment through a water vapor outlet of the regenerator, enabling the high-temperature dehumidification solution with increased concentration to flow out of the regenerator to sequentially pass through the second liquid storage pump and a fourth three-way valve to enter the second liquid storage tank, enabling the diluted dehumidification solution to be mixed with the dehumidification solution in the first liquid storage tank, enabling the diluted dehumidification solution in the second liquid storage tank to flow to be high to reach a preset concentration, enabling the high-temperature dehumidification solution in the second liquid storage tank to be cooled down to be repeatedly cooled in the second three-way valve, and enabling the concentrated dehumidification solution to be cooled down to be adjusted to be cooled in the second three-way valve The second three-way valve, the third three-way valve and the fourth three-way valve realize refrigerant circulation, solution dehumidification circulation and solution regeneration circulation.
According to the method for dehumidifying and inhibiting frost of the air source heat pump solution, the first liquid storage tank and the second liquid storage tank alternately enter the solution for dehumidifying and circulating, waste heat generated by the compressor in the process of storing a refrigerant by the heat storage device is used for regenerating the dehumidified solution, so that the solution dehumidifying and regenerating cycles are continuously carried out, the outdoor heat exchanger can exchange heat with dehumidified outdoor dry air, the occurrence of the phenomenon of frost is avoided, the dehumidified solution is regenerated by the unavoidable waste heat during the operation of the compressor, the energy utilization rate is improved, and the energy consumption and the cost are reduced.
Compared with the background technology, the air source heat pump solution dehumidifying and frost inhibiting system and method of the invention have the following beneficial effects:
the air can be dehumidified conveniently, the regeneration of the dehumidified solution can be realized, the energy utilization rate is improved, and the energy consumption and the cost are reduced.
Drawings
FIG. 1 is a schematic diagram of a system for dehumidifying and inhibiting frost in an air source heat pump solution in an embodiment of the present invention;
FIG. 2 is a schematic diagram of a dehumidifier according to an embodiment of the present invention;
FIG. 3 is a schematic view of a regenerator in accordance with an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a heat reservoir according to an embodiment of the present invention.
In the drawing, a 1-refrigerant circulation loop, a 11-compressor, a 12-four-way reversing valve, a 13-indoor heat exchanger, a 14-throttle valve, a 15-outdoor heat exchanger, a 2-solution dehumidification circulation loop, a 21-dehumidifier, a 211-low temperature concentrated dehumidification solution inlet, a 212-low temperature diluted dehumidification solution outlet, a 22-first three-way valve, a 23-first liquid storage tank, a 24-second liquid storage tank, a 25-second three-way valve, a 26-first solution pump, a 3-solution regeneration circulation loop, a 31-third three-way valve, a 32-heat reservoir, a 321-heat exchange tube, a 33-regenerator, a 331-high temperature diluted dehumidification solution inlet, a 332-high temperature concentrated dehumidification solution outlet, a 34-second solution pump, a 35-fourth three-way valve, a 4-hollow fiber membrane component and a 5-outdoor fan are arranged;
Detailed Description
The invention is further described below in connection with the following detailed description. In which the drawings are for illustrative purposes only and are not intended to be construed as limiting the present patent, and in which certain elements of the drawings may be omitted, enlarged or reduced in order to better illustrate embodiments of the present invention, and not to represent actual product dimensions, it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
In the description of the present invention, it should be understood that, if there is an azimuth or positional relationship indicated by terms such as "upper", "lower", "left", "right", etc., which are based on the azimuth or positional relationship shown in the drawings, it is merely for convenience of describing the present invention and simplifying the description, and it is not indicated or implied that the apparatus or elements referred to must have a specific azimuth, be constructed and operated in a specific azimuth, so that the terms describing the positional relationship in the drawings are merely for exemplary illustration and are not to be construed as limitations of the present patent, and that the specific meanings of the terms described above should be understood by those skilled in the art according to circumstances.
Example 1
An air source heat pump solution dehumidifying and frost-inhibiting system, as shown in figure 1, comprises a refrigerant circulation loop 1, a solution dehumidifying circulation loop 2 and a solution regenerating circulation loop 3;
The refrigerant circulation loop 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, wherein the output end of the compressor 11 is connected with 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 with 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 with the input end of the compressor 11 through 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, wherein the first liquid storage tank 23 and the second liquid storage tank 24 are respectively provided with a low-temperature diluted dehumidification solution inlet and a low-temperature concentrated dehumidification solution outlet, the two low-temperature diluted dehumidification solution inlets are respectively connected with 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 with 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 with 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, a first solution storage tank 23 and a second solution storage tank 24, wherein the compressor 11 is a closed compressor 11, the heat reservoir 32 is arranged on the outer wall of the compressor 11, the first solution storage tank 23 and the second solution storage tank 24 are respectively provided with a low-temperature diluted dehumidification solution outlet 212 and a high-temperature concentrated dehumidification solution inlet, the two low-temperature diluted dehumidification solution outlets 212 are connected with 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 with the input end of the regenerator 33, the output end of the regenerator 33 is connected with the input end of the second solution pump 34, and the two high-temperature concentrated dehumidification solution inlets are connected with 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, the outdoor dry air outlet of the dehumidifier 21 is connected with the outdoor dry air inlet of the outdoor heat exchanger 15, and the regenerator 33 is provided with a water vapor outlet which is communicated with the outdoor low-temperature environment.
In the above-mentioned air source heat pump solution dehumidification and frost suppression system, in the refrigerant circulation, low-temperature low-pressure refrigerant vapor is compressed by the compressor 11 to obtain high-temperature high-pressure refrigerant vapor, and the heat reservoir 32 arranged on the outer wall of the compressor 11 absorbs and stores waste heat generated when the compressor 11 operates; the high-temperature high-pressure refrigerant vapor enters the indoor heat exchanger 13 through the four-way reversing valve 12, exchanges heat with indoor air in the indoor heat exchanger 13, is condensed into low-temperature high-pressure refrigerant liquid, the low-temperature high-pressure refrigerant liquid coming out of the indoor heat exchanger 13 is depressurized into low-temperature low-pressure refrigerant liquid through the throttle valve 14, the low-temperature low-pressure refrigerant liquid enters the outdoor heat exchange chamber, outdoor air dried through the dehumidifier 21 enters the outdoor heat exchanger 15, the low-temperature low-pressure refrigerant liquid and the outdoor dry air exchange heat in the outdoor heat exchanger 15 into 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 dehumidifying cycle, the first three-way valve 22 and the second three-way valve 25 are connected with the dehumidifier 21, the first liquid storage tank 23 and the first solution pump 26, in the solution regenerating cycle, the third three-way valve 31 and the fourth three-way valve 35 are connected with the heat reservoir 32, the second liquid storage tank 24 and the second solution pump 34, after a certain 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 are switched to be in pipeline, in the solution dehumidifying cycle, the first three-way valve 22 and the second three-way valve 25 are connected with the dehumidifier 21, the second liquid storage tank 24 and the first solution pump 26, in the solution regenerating cycle, the third three-way valve 31 and the fourth three-way valve 35 are connected with the heat reservoir 32, 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 piping, and the second tank 24 is in the solution regeneration circulation circuit 3 in the first period, but since the concentrated dehumidifying solution is stored in the second tank 24 initially without regeneration, the second solution pump 34 is turned off until the second period starts in the first period. In the embodiment, the outdoor heat exchanger 15 can exchange heat with outdoor dry air through the continuous solution dehumidification and solution regeneration, so that the frosting phenomenon is avoided, and the inevitable waste heat of the compressor 11 of the air source heat pump is selected on the dehumidification solution regeneration heat source for regeneration, so that low-grade energy is utilized, the energy utilization rate is improved, and the energy loss and the cost are reduced.
The outdoor heat exchanger 15 is an air-cooled heat exchanger, and the outdoor fan 5 is arranged between the dehumidifier 21 and the outdoor heat exchanger 15, so that the heat exchange efficiency is improved.
Example two
The present embodiment is similar to the embodiment except that, as shown in fig. 2 to 4, the dehumidifier 21 and the regenerator 33 are each composed of a hollow fiber membrane module 4, a phase change heat storage material and a heat exchange tube 321 are installed in the heat storage 32, the phase change heat storage material wraps the heat exchange tube 321, the dehumidifier 21 is provided with a low temperature concentrated dehumidification solution inlet 211 connected with the first solution pump 26 and a low temperature diluted dehumidification solution outlet 212 connected with the first three-way valve 22, and the regenerator 33 is provided with a high temperature diluted dehumidification solution inlet 331 connected with the heat exchange tube 321 and a high temperature concentrated dehumidification solution outlet 332 connected with the second solution pump 34. The hollow fiber membrane module 4 comprises hydrophobic, water vapor permselective, hollow lumen fiber filaments, the raw materials of which include, but are not limited to, polypropylene, polyvinylidene fluoride, or polytetrafluoroethylene. The dehumidifying solution in the dehumidifier 21 and the regenerator 33 passes through the tube side of the hollow fiber membrane module 4, the dehumidifier 21 is provided with an outdoor wet air inlet and an outdoor dry air outlet, and 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 escapes from the outdoor dry air outlet.
The heat exchange tube 321 is a pipeline with good heat conducting performance and resistance to corrosion of the dehumidifying solution.
The phase-change heat storage material has a structure with a phase-change temperature not less than 40 degrees, good heat conduction performance and large heat capacity of a phase-change section.
The first liquid storage tank 23 and the second liquid storage tank 24 are filled with dehumidifying solution, and the shells of the first liquid storage tank 23 and the second liquid storage tank 24 are of a structure resistant to corrosion of the dehumidifying solution.
The dehumidifying solution is a dehumidifying solution which does not crystallize in a temperature range of 0-20 degrees and does not crystallize at the phase change temperature of the phase change heat storage material and the initial solution concentration.
Specifically, the dehumidifier 21 and the regenerator 33 are both composed of a PTFE hollow fiber membrane module 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 tube, and the dehumidifying solution is lithium chloride salt solution.
In this embodiment, the dehumidifier 21 based on the hollow fiber membrane module 4 performs dehumidification treatment on the air flowing through the outdoor heat exchanger 15 so as to prevent frosting of the air source heat pump, and the closed solution circulation effectively prevents pollution of outdoor environment impurities to the dehumidifying solution, and according to the specific air relative humidity conditions of different areas, the dehumidification can be performed by adjusting the number and arrangement mode of the hollow fiber membrane tubes of the hollow fiber membrane module 4, so that the dehumidification capability is flexible and the range is wide. In addition, the hollow fiber membrane module 4 for solution dehumidification and regeneration in the present embodiment has low cost, and the hollow fiber membrane module 4 has relatively small size, convenient arrangement and flexible adjustment.
Example III
The present embodiment is a solution dehumidification method and a solution regeneration method applied to the air source heat pump solution dehumidification and frost suppression system of 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 with the dehumidifier 21, the first liquid storage tank 23 and the first solution pump 26, the concentrated dehumidification solution of the first liquid storage tank 23 sequentially passes through the second three-way valve 25 and the first solution pump 26 to enter the dehumidifier 21, the concentrated dehumidification solution absorbs water vapor in the outdoor dehumidification air entering the dehumidifier 21, the outdoor dehumidification air entering the outdoor heat exchanger 15 after dehumidification by the dehumidifier 21 exchanges heat with the low-temperature 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 to be mixed with the dehumidification solution in the first liquid storage tank 23; the low-temperature low-pressure refrigerant vapor is compressed by a compressor 11 to obtain high-temperature high-pressure refrigerant vapor, the heat accumulator 32 absorbs and stores waste heat of the compressor 11, the high-temperature high-pressure refrigerant vapor enters an indoor heat exchanger 13 through a four-way reversing valve 12 to exchange heat with air and condense into low-temperature high-pressure refrigerant liquid, the temperature of the indoor air is increased to complete heating, the low-temperature high-pressure refrigerant liquid is throttled and depressurized by a throttle valve 14 to become low-temperature low-pressure refrigerant liquid, and then enters an outdoor heat exchanger 15 to exchange heat with outdoor air dried by a dehumidifier 21 to become low-temperature low-pressure refrigerant vapor, and the low-temperature low-pressure refrigerant vapor exiting from the outdoor heat exchanger 15 enters the compressor 11 through the four-way reversing valve 12 to complete refrigerant circulation.
In the process of dehumidifying outdoor humid air, the concentration of the concentrated dehumidifying solution of the first liquid storage tank 23 is reduced in the dehumidifier 21, after the concentration of the concentrated dehumidifying solution of the first liquid storage tank 23 is reduced to a dilute dehumidifying solution with 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, the first three-way valve 22 and the second three-way valve 25 are connected with the dehumidifier 21, the second liquid storage tank 24 and the first solution pump 26, the third three-way valve 31 and the fourth three-way valve 35 are connected with the heat storage 32, the first liquid storage tank 23 and the second solution pump 34, the concentrated dehumidifying solution of the second liquid storage tank 24 sequentially passes through the second three-way valve 25 and the first solution pump 26 to enter the dehumidifier 21, the outdoor dry air enters the outdoor heat exchanger 15 to exchange heat with low-temperature low-pressure refrigerant liquid, the dehumidified solution with the reduced concentration enters the second liquid storage tank 24 through the first three-way valve 22 to be mixed with the dehumidifying solution in the second liquid storage tank 24, the first liquid storage tank 23 passes through the third three-way valve 22 to be higher in the outdoor heat storage 33, and the high-pressure water vapor is discharged from the second liquid storage tank 33 to the outdoor heat storage 32 through the high-pressure water storage 33, and the high-pressure water storage solution is discharged from the outdoor heat storage 32 to the outdoor heat storage 32 through the third three-way valve 35, and the high-pressure water storage solution is sequentially discharged from the outdoor heat storage 32 to the outdoor heat storage 32 is discharged through the high-pressure water storage 32.
The time required for the solution regeneration is smaller than the time for continuously dehumidifying the dehumidifying solution in the second liquid storage tank 24, when the concentration of the dehumidifying solution in the first liquid storage tank 23 is high to the preset concentration, the second solution pump 34 is closed, and the high-temperature concentrated dehumidifying solution is cooled to the low-temperature concentrated dehumidifying 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 regulated, so that the first three-way valve 22 and the second three-way valve 25 are connected with 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 with the heat accumulator 32, the second liquid storage tank 24 and the second solution pump 34, the concentrated dehumidification solution in the first liquid storage tank 23 sequentially passes through the second three-way valve 25 and the first solution pump 26 to enter the dehumidifier 21, the concentrated dehumidification solution absorbs water vapor in the outdoor dehumidification air entering the dehumidifier 21, the outdoor dry air enters the outdoor heat exchanger 15 to exchange heat with the low-temperature low-pressure refrigerant liquid, the reduced dehumidification solution enters the first liquid storage tank 23 through the first three-way valve 22 to be mixed with the dehumidification solution in the first liquid storage tank 23, the dilute dehumidification solution in the second liquid storage tank 24 passes through the third three-way valve 31 to enter the heat accumulator 32 and absorb the energy stored in the heat accumulator 32, and the high-pressure water vapor is regenerated from the outdoor water vapor enters the outdoor water vapor 33 to the high-pressure environment through the outdoor water vapor regeneration water vapor, and the high-pressure environment is discharged from the outdoor vapor storage water vapor is discharged from the outdoor water vapor storage 33, the high-temperature dehumidification solution with increased concentration flows out of the regenerator 33 and sequentially enters the second liquid storage tank 24 through the second solution pump 34 and the fourth three-way valve 35, the time required for solution regeneration is shorter than the time for continuous dehumidification 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 is high to 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 second liquid storage tank 24;
due to the periodic switching of the pipelines, the solution dehumidification and the solution regeneration are continuously performed, so that the outdoor heat exchanger 15 can exchange heat with outdoor dry air, and the frosting phenomenon is avoided.
In the specific content of the above embodiment, any combination of the technical features may be performed without contradiction, and for brevity of description, all possible combinations of the technical features are not described, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
It is to be understood that the above examples of the present invention are provided by way of illustration only and not by way of limitation of the embodiments of the present invention. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the invention are desired to be protected by the following claims.
Claims (10)
1. The air source heat pump solution dehumidifying and frost-inhibiting system is characterized by comprising a refrigerant circulation loop (1), a solution dehumidifying circulation loop (2) and a solution regenerating circulation loop (3);
The refrigerant circulation loop (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), wherein the output end of the compressor (11) is connected with 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 with 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 with the input end of the compressor (11) through 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), wherein the first liquid storage tank (23) and the second liquid storage tank (24) are respectively provided with a low-temperature diluted dehumidification solution inlet and a low-temperature concentrated dehumidification solution outlet, the two low-temperature diluted dehumidification solution inlets are respectively connected with 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 with 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 with 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 solution storage tank (23) and the second solution storage tank (24), the compressor (11) is a closed compressor (11), the heat reservoir (32) is arranged on the outer wall of the compressor (11), the first solution storage tank (23) and the second solution storage tank (24) are respectively provided with a low-temperature diluted dehumidification solution outlet (212) and a high-temperature concentrated dehumidification solution inlet, the two low-temperature diluted dehumidification solution outlets (212) are connected with 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 with the input end of the regenerator (33), the output end of the regenerator (33) is connected with the input end of the second solution pump (34), and the two Gao Wennong dehumidification solution inlets are connected with 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, the outdoor dry air outlet of the dehumidifier (21) is connected with 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 dehumidifying and frost-inhibiting system according to claim 1, wherein the dehumidifier (21) and the regenerator (33) are each composed of a hollow fiber membrane module (4).
3. An air source heat pump solution dehumidification and frost suppression system according to claim 2, wherein the hollow fiber membrane module (4) comprises hydrophobic, water vapor selectively permeable, hollow lumen fiber filaments.
4. An air source heat pump solution dehumidifying and frost-inhibiting system as claimed in claim 2, wherein the dehumidifying solution in the dehumidifier (21) and the regenerator (33) is taken away from the tube side of the hollow fiber membrane module (4), the dehumidifier (21) is provided with an outdoor humid air inlet and an outdoor dry air outlet, and the outdoor humid air enters the dehumidifier (21) from the outdoor humid air inlet and passes outwards through the hollow fiber membrane module (4) and then flows out from the outdoor dry air outlet.
5. The air source heat pump solution dehumidifying and frost-inhibiting system according to claim 1, wherein 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. An air source heat pump solution dehumidification and frost suppression system according to any one of claims 1 to 5, characterized in that the heat reservoir (32) is filled with a phase change heat storage material and a heat exchange tube (321), the phase change heat storage material wrapping the heat exchange tube (321).
7. The air source heat pump solution dehumidifying and frost-inhibiting system as claimed in claim 6, wherein the heat exchange tube (321) is a tube with good heat conducting property and resistance to corrosion of dehumidifying solution.
8. The air source heat pump solution dehumidifying and frost-inhibiting system according to claim 6, wherein the first liquid storage tank (23) and the second liquid storage tank (24) are filled with dehumidifying solution, and the shells of the first liquid storage tank (23) and the second liquid storage tank (24) are of a structure which is resistant to corrosion of the dehumidifying solution and good in heat conducting performance.
9. The air source heat pump solution dehumidifying and frost-inhibiting system according to claim 8, wherein the dehumidifying solution is a dehumidifying solution which does not crystallize in 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. A method for dehumidifying and inhibiting frost of an air source heat pump solution, which is applied to the dehumidifying and inhibiting frost system of any one of claims 1 to 9, and is characterized by comprising the following steps:
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 regulated, the first three-way valve (22) and the second three-way valve (25) are connected with the dehumidifier (21), the first liquid storage tank (23) and the first solution pump (26), the concentrated dehumidification solution of the first liquid storage tank (23) sequentially passes through the second three-way valve (25) and the first solution pump (26) to enter the dehumidifier (21), the concentrated dehumidification solution absorbs water vapor in 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 low-temperature 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) to be mixed with the dehumidification solution in the first liquid storage tank (23);
The low-temperature and low-pressure refrigerant vapor is compressed by a compressor (11) to obtain high-temperature and high-pressure refrigerant vapor, the heat reservoir (32) absorbs and stores waste heat of the compressor (11), the high-temperature and high-pressure refrigerant vapor enters an indoor heat exchanger (13) through a four-way reversing valve (12) to exchange heat with air and condense into low-temperature and high-pressure refrigerant liquid, the temperature of the indoor air is increased to finish heating, the low-temperature and high-pressure refrigerant liquid is throttled and depressurized by a throttle valve (14) to become low-temperature and low-pressure refrigerant liquid, and then enters an outdoor heat exchanger (15) to exchange heat with the outdoor air dried by a dehumidifier (21) to become 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 finish refrigerant circulation;
After the concentration of the concentrated dehumidification solution of the first liquid storage tank (23) is reduced to a dilute dehumidification solution with preset concentration, a first three-way valve (22), a second three-way valve (25), a third three-way valve (31) and a fourth three-way valve (35) are regulated, so that the first three-way valve (22) and the second three-way valve (25) are connected with the dehumidifier (21), the second liquid storage tank (24) and the first solution pump (26), the third three-way valve (31) and the fourth three-way valve (35) are connected with the heat storage (32), the first liquid storage tank (23) and the second solution pump (34), the concentrated dehumidification solution of the second liquid storage tank (24) sequentially passes through the second three-way valve (25) and the first solution pump (26) to enter the dehumidifier (21), the concentrated dehumidification solution absorbs water vapor in outdoor wet air entering the dehumidifier (21), the outdoor dry air enters the outdoor heat exchanger (15) to exchange heat with low-temperature low-pressure refrigerant liquid, and the mixed dehumidification solution with the reduced concentration enters the second liquid storage tank (24) through the first three-way valve (22);
The dilute dehumidification solution in the first liquid storage tank (23) enters the heat storage device (32) through the third three-way valve (31) and absorbs energy stored in the heat storage device (32), the high-temperature dilute dehumidification solution flows out of the heat storage device (32) and enters the regenerator (33), the surface vapor pressure of the high-temperature dilute dehumidification solution is larger than that of outdoor air, so that the vapor in the dilute dehumidification solution escapes to the outdoor environment through a vapor outlet of the regenerator (33), and the high-temperature dehumidification solution with increased concentration flows out of the regenerator (33) to enter the first liquid storage tank (23) through the second solution pump (34) and the fourth three-way valve (35) in sequence;
When the concentration of the dehumidification solution in the first liquid storage tank (23) is high to a preset concentration, the second solution pump (34) is closed, the high-temperature concentrated dehumidification solution is cooled to a low-temperature concentrated dehumidification solution in the first liquid storage tank (23), after the concentration of the concentrated dehumidification solution in the second liquid storage tank (24) is reduced to a dilute dehumidification solution with the 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 regulated, so that the first three-way valve (22) and the second three-way valve (25) are connected with 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 with the heat storage device (32), the second liquid storage tank (24) and the second solution pump (34), the concentrated dehumidification solution in the first liquid storage tank (23) sequentially passes through the second three-way valve (25) and the first solution pump (26) to enter the dehumidifier (21), the dehumidification solution is absorbed into outdoor wet air in the dehumidifier (21), the outdoor wet air is compressed air, and the outdoor heat exchange liquid is cooled outside the low-temperature heat exchanger (15), the diluted dehumidification solution in the second liquid storage tank (24) enters the heat storage device (32) through the third three-way valve (31) and absorbs the energy stored in the heat storage device (32), the high-temperature diluted dehumidification solution flows out of the heat storage device (32) and enters the regenerator (33), and because the surface vapor pressure of the high-temperature diluted dehumidification solution is greater than the outdoor air vapor pressure, the vapor in the diluted dehumidification solution escapes into the outdoor environment through the vapor outlet of the regenerator (33), and the high-temperature dehumidification solution with increased concentration flows out of the regenerator (33) and sequentially passes through the second solution pump (34) and the fourth three-way valve (35) to enter the second liquid storage tank (24);
When the concentration of the dehumidification solution in the second liquid storage tank (24) is high to a preset concentration, the second solution pump (34) is closed, the high-temperature concentrated dehumidification solution is cooled to a low-temperature concentrated dehumidification solution in the second liquid storage tank (24), and 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 repeatedly to realize refrigerant circulation, solution dehumidification circulation and solution regeneration circulation.
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| CN106051975A (en) * | 2016-06-08 | 2016-10-26 | 东南大学 | Frostless air source heat pump device and method based on membrane method dehumidification and indoor regeneration humidification |
| CN106705300A (en) * | 2016-12-30 | 2017-05-24 | 南京师范大学 | Composite type air conditioning device and conditioning method thereof |
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| CN106051975A (en) * | 2016-06-08 | 2016-10-26 | 东南大学 | Frostless air source heat pump device and method based on membrane method dehumidification and indoor regeneration humidification |
| CN106705300A (en) * | 2016-12-30 | 2017-05-24 | 南京师范大学 | Composite type air conditioning device and conditioning method thereof |
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