CN108679871B - Tube plate type frostless air source heat pump system - Google Patents
Tube plate type frostless air source heat pump system Download PDFInfo
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- CN108679871B CN108679871B CN201810646695.9A CN201810646695A CN108679871B CN 108679871 B CN108679871 B CN 108679871B CN 201810646695 A CN201810646695 A CN 201810646695A CN 108679871 B CN108679871 B CN 108679871B
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- 239000007788 liquid Substances 0.000 claims abstract description 175
- 230000008929 regeneration Effects 0.000 claims abstract description 120
- 238000011069 regeneration method Methods 0.000 claims abstract description 120
- 239000003507 refrigerant Substances 0.000 claims abstract description 67
- 239000007921 spray Substances 0.000 claims abstract description 64
- 230000001172 regenerating effect Effects 0.000 claims abstract description 48
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 24
- 238000004891 communication Methods 0.000 claims description 5
- 238000009833 condensation Methods 0.000 claims description 5
- 230000005494 condensation Effects 0.000 claims description 5
- 239000000945 filler Substances 0.000 claims description 4
- 230000002528 anti-freeze Effects 0.000 description 73
- 239000012530 fluid Substances 0.000 description 33
- 238000005507 spraying Methods 0.000 description 26
- 238000010438 heat treatment Methods 0.000 description 14
- 238000010521 absorption reaction Methods 0.000 description 7
- 229920006395 saturated elastomer Polymers 0.000 description 6
- 239000013526 supercooled liquid Substances 0.000 description 6
- 239000003463 adsorbent Substances 0.000 description 5
- 238000001816 cooling Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 238000005265 energy consumption Methods 0.000 description 4
- 238000005057 refrigeration Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 230000002265 prevention Effects 0.000 description 3
- 238000001704 evaporation Methods 0.000 description 2
- 230000008020 evaporation Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000010257 thawing Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000007791 dehumidification Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B13/00—Compression machines, plants or systems, with reversible cycle
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B41/00—Fluid-circulation arrangements
- F25B41/20—Disposition of valves, e.g. of on-off valves or flow control valves
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B41/00—Fluid-circulation arrangements
- F25B41/30—Expansion means; Dispositions thereof
- F25B41/31—Expansion valves
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B47/00—Arrangements for preventing or removing deposits or corrosion, not provided for in another subclass
- F25B47/02—Defrosting cycles
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/52—Heat recovery pumps, i.e. heat pump based systems or units able to transfer the thermal energy from one area of the premises or part of the facilities to a different one, improving the overall efficiency
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Other Air-Conditioning Systems (AREA)
- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
Abstract
The invention relates to the technical field of air source heat pumps, in particular to a tube plate type frostless air source heat pump system, which comprises a regenerative heat exchanger, a surface cooler, a compressor, a four-way valve, a condenser and a tube plate type heat exchanger, wherein the compressor, the four-way valve, the condenser and the tube plate type heat exchanger are sequentially communicated along a refrigerant circulation loop; the upper part and the lower part of the regenerative heat exchanger are respectively provided with a regenerative spray assembly and a regenerative liquid storage tank, the regenerative liquid storage tank is communicated with the regenerative spray assembly, the regenerative heat exchanger is provided with a first liquid inlet pipe and a second liquid inlet pipe which are arranged in parallel, the first liquid inlet pipe is communicated with a liquid outlet of the condenser, the second liquid inlet pipe is communicated with a liquid inlet of the condenser, and a liquid outlet pipe of the regenerative heat exchanger is communicated with a liquid outlet of the condenser; a tube plate spray assembly and a tube plate liquid storage tank are respectively arranged above and below the tube plate heat exchanger, a liquid inlet of the surface cooler is communicated with the tube plate liquid storage tank, and a liquid outlet of the surface cooler is communicated with the tube plate spray assembly; the air outlet of the regeneration heat exchanger is communicated with the air inlet of the surface cooler, and the air inlet of the regeneration heat exchanger is communicated with the air outlet of the surface cooler.
Description
Technical Field
The invention relates to the technical field of frostless air source heat pumps, in particular to a tube plate type frostless air source heat pump system.
Background
At present, the traditional air-cooled air source heat pump has the problem of frosting in the application process of the south area of China, including the problems of false defrosting, incomplete defrosting, low efficiency, poor comfort and the like. In order to solve a series of problems caused by frosting, the frostless air source heat pump has been developed with the advantages of frostless, uninterrupted heat supply, stability and reliability, etc.
The existing frostless air source heat pump system is characterized in that two heat pump systems are adopted to run in parallel, an auxiliary heat pump is used for extracting heat from air and heating regeneration solution for regeneration, and a heat supply heat pump supplies heat for users, so that on one hand, frostless operation is realized by utilizing solution dehumidification, and on the other hand, sensible heat and latent heat in regenerated air are recovered through a closed air circulation loop, and therefore the regeneration efficiency and the running energy efficiency of the system are improved. However, such a system has the problems of complex system, large initial investment and many heat exchange links, and the cooling efficiency in summer is not high because the cooling of the heat pump in summer is not considered. In the heating mode, the outdoor air is firstly adsorbed and dehumidified by the evaporator coated with the adsorbent, and then the dehumidified air enters the secondary evaporator for heat exchange, so that frosting is avoided; in the regeneration mode, the adsorbent is regenerated by circulating air, so that the complete recovery of the regeneration heat is realized. The system type solves the problems that frostless air source heat pump can not prevent frosting and possibly causes high energy consumption, but still has the following defects: ① Because the adsorbent material is sprayed on the surface of the air-cooled heat exchanger, the use amount of the adsorbent is limited, the frostless operation time is shortened undoubtedly, the regeneration process is frequently carried out, and the indoor comfort is affected; ② The adsorbent material may cause deterioration of heat exchange performance of the heat exchanger, and is more disadvantageous to the heat exchanger, especially when operating in a summer cooling mode.
Disclosure of Invention
First, the technical problem to be solved
The invention aims to solve the technical problems that the existing frostless air source heat pump system is complex in structure, large in initial investment and high in equipment idling rate, and cannot realize efficient refrigeration in summer.
(II) technical scheme
In order to solve the technical problems, the invention provides a tube-plate frostless air source heat pump system, which comprises a regenerative heat exchanger, a surface cooler, a compressor, a four-way valve, a condenser and a tube-plate heat exchanger, wherein the compressor, the four-way valve, the condenser and the tube-plate heat exchanger are sequentially communicated along a refrigerant circulation loop; the upper part and the lower part of the regenerative heat exchanger are respectively provided with a regenerative spray assembly and a regenerative liquid storage tank, the regenerative liquid storage tank is communicated with the regenerative spray assembly, the regenerative heat exchanger is provided with a first liquid inlet pipe and a second liquid inlet pipe which are arranged in parallel, the first liquid inlet pipe is communicated with a liquid outlet of the condenser, the second liquid inlet pipe is communicated with a liquid inlet of the condenser, and a liquid outlet pipe of the regenerative heat exchanger is communicated with a liquid outlet of the condenser; a tube plate spray assembly and a tube plate liquid storage tank are respectively arranged above and below the tube plate type heat exchanger, a liquid inlet of the surface cooler is communicated with the tube plate liquid storage tank, and a liquid outlet of the surface cooler is communicated with the tube plate spray assembly; the air outlet of the regeneration heat exchanger is communicated with the air inlet of the surface cooler, and the air inlet of the regeneration heat exchanger is communicated with the air outlet of the surface cooler.
The condenser is provided with an expansion valve on a pipeline communicated with the tube-sheet type heat exchanger, a first electromagnetic valve is further arranged on a pipeline communicated with the condenser, a liquid outlet pipe of the regenerative heat exchanger is communicated with the pipeline between the expansion valve and the first electromagnetic valve, and a first liquid inlet pipe is communicated with the pipeline between the first electromagnetic valve and the condenser.
The first liquid inlet pipe is provided with a series electromagnetic valve, the second liquid inlet pipe is provided with a parallel electromagnetic valve, and the liquid outlet pipe of the regenerative heat exchanger is provided with a second electromagnetic valve.
And a liquid return electromagnetic valve of the surface cooler is arranged on a pipeline, wherein the liquid outlet of the surface cooler is communicated with the tube plate spray assembly.
Wherein, the below of surface cooler is equipped with the water congeals the water tray, the water congeals the water tray bottom and is equipped with the bleeder.
And a regeneration spray pump and a spray electromagnetic valve are sequentially arranged on the communication pipeline of the regeneration liquid storage pool and the regeneration spray assembly.
The regeneration liquid storage pool is communicated with the tube plate liquid storage pool, and a regeneration liquid inlet electromagnetic valve is arranged on a communicating pipeline.
The regeneration liquid storage pool is communicated with the tube plate spray assembly, and a regeneration liquid return electromagnetic valve is arranged on a communicating pipeline.
And a tube plate spray pump and a bypass electromagnetic valve are sequentially arranged on a connecting pipeline of the tube plate liquid storage tank and the tube plate spray assembly.
The outside of tube sheet type heat exchanger is equipped with the casing, the top of casing is equipped with the fan, the bottom of casing is equipped with the tube sheet liquid storage tank, still be equipped with the air inlet grid on the casing, tube sheet type heat exchanger with be equipped with the filler between the tube sheet liquid storage tank.
(III) beneficial effects
The technical scheme of the invention has the following advantages:
The outdoor side heat exchanger of the tube-plate frostless air source heat pump system is a tube-plate heat exchanger, can be converted into a high-efficiency tube-plate evaporation type condenser in summer, and meets the requirement of high-efficiency refrigeration.
The invention also provides a regeneration heat exchanger and a surface cooler, which are used as a regeneration device of antifreeze liquid sprayed to the tube plate heat exchanger by the tube plate type spray assembly when the system heats, and the tube plate heat exchanger has smaller water absorption capacity and lower proportion of latent heat to total heat under the normal condition, and the heat pump system starts a serial regeneration heating mode. The high-temperature high-pressure refrigerant gas at the outlet of the compressor firstly enters the condenser through the four-way valve to be condensed and released to supply heat for a user, then enters the regenerative heat exchanger through the first liquid inlet pipe to be further released to become supercooled liquid refrigerant, becomes low-temperature low-pressure two-phase refrigerant after being throttled by the expansion valve, then enters the tube plate type heat exchanger to absorb heat to become low-temperature low-pressure gaseous refrigerant, returns to the compressor to be recompressed into high-temperature high-pressure refrigerant gas, and is circulated repeatedly and continuously. The low-concentration antifreeze liquid circularly sprayed to the surface of the regeneration heat exchanger through the regeneration spray assembly from the regeneration liquid storage tank absorbs heat of the refrigerant, the temperature is increased, the saturated vapor partial pressure of the surface of the antifreeze liquid is increased and is higher than the vapor partial pressure of air entering the regeneration heat exchanger, moisture is transferred from solution to the air, the temperature and the humidity of the air are both increased, then the air flows out of the regeneration heat exchanger and enters the surface cooler, and as a part of low-temperature antifreeze liquid in the tube plate liquid storage tank flows into the surface cooler, the surface temperature of the surface cooler is lower than the dew point temperature of the air entering the surface cooler, the moisture in the air is condensed, the temperature of the air is reduced, the moisture content is reduced, and the air returns to the inlet of the regeneration heat exchanger to continue the next circulation. Thus, the water in the antifreeze in the regeneration liquid storage tank is continuously discharged out of the system, and the concentration is gradually increased, so that the regeneration is realized. The tube plate spraying assembly on the tube plate type heat exchanger sprays the antifreeze fluid on the surface of the tube plate type heat exchanger so as to prevent frosting, outdoor air flows through the outer side of the tube plate and exchanges heat with the antifreeze fluid, and finally heat is absorbed by two-phase low-temperature refrigerant in the tube plate. The antifreeze fluid flows into the liquid storage tank of the tube plate after heat exchange from the surface of the tube plate heat exchanger, then one part returns to the tube plate spraying assembly, the other part enters the surface cooler for heat exchange, and the antifreeze fluid returns to the tube plate spraying assembly after the temperature rises.
When the moisture content of the outdoor air is high, and the water absorption capacity of the tube-plate heat exchanger is high, the heat of the supercooled refrigerant at the outlet of the condenser is insufficient to meet the heat required by the regeneration of the antifreeze, and at the moment, the heat pump system starts a parallel regeneration heating mode. The high-temperature high-pressure refrigerant gas at the outlet of the compressor is divided into two paths after passing through the four-way valve, one path of the refrigerant gas enters the condenser to condense and release heat to supply heat for users, then enters the tube plate type heat exchanger after being throttled by the expansion valve, the other path of the refrigerant gas enters the regenerative heat exchanger through the second liquid inlet tube, the released heat becomes supercooled liquid refrigerant, the refrigerant gas becomes low-temperature low-pressure two-phase refrigerant after being throttled by the expansion valve, then enters the tube plate type heat exchanger to absorb heat and becomes low-temperature low-pressure gaseous refrigerant, and the refrigerant gas returns to the compressor to be compressed again to high-temperature high-pressure refrigerant gas, so that the cycle is repeated continuously. The low-concentration antifreeze liquid circularly sprayed to the surface of the regeneration heat exchanger through the regeneration spray assembly from the regeneration liquid storage tank absorbs heat of the refrigerant, the temperature is increased, the saturated vapor partial pressure of the surface of the antifreeze liquid is increased and is higher than the vapor partial pressure of air entering the regeneration heat exchanger, moisture is transferred from solution to the air, the temperature and the humidity of the air are both increased, then the air flows out of the regeneration heat exchanger and enters the surface cooler, and as a part of low-temperature antifreeze liquid in the tube plate liquid storage tank flows into the surface cooler, the surface temperature of the surface cooler is lower than the dew point temperature of the air entering the surface cooler, the moisture in the air is condensed, the temperature of the air is reduced, the moisture content is reduced, and the air returns to the inlet of the regeneration heat exchanger to continue the next circulation. Therefore, the water in the antifreeze in the regeneration liquid storage tank is continuously discharged out of the system, and the concentration is gradually increased, so that the regeneration is realized. The tube plate spraying assembly on the tube plate type heat exchanger sprays the antifreeze fluid on the surface of the tube plate type heat exchanger so as to prevent frosting, outdoor air flows through the outer side of the tube plate and exchanges heat with the antifreeze fluid, and finally heat is absorbed by two-phase low-temperature refrigerant in the tube plate. The antifreeze fluid flows into the liquid storage tank of the tube plate after heat exchange from the surface of the tube plate heat exchanger, then one part returns to the tube plate spraying assembly, the other part enters the surface cooler for heat exchange, and the antifreeze fluid returns to the tube plate spraying assembly after the temperature rises.
The invention can make corresponding change of the antifreeze regeneration mode according to the actual working condition, has strong adaptability and reliable and controllable operation, improves the stability and continuity of heat supply, has more obvious frost prevention effect, does not need to set an extra cold and heat source for antifreeze regeneration, reduces the equipment initial investment and the idle rate, and greatly reduces the energy consumption level, thereby improving the reliability, the comfort and the safety of heat supply.
In addition to the technical problems, features of the constituent technical solutions and advantages brought by the technical features of the technical solutions described above, other technical features of the present invention and advantages brought by the technical features of the technical solutions, further description will be made with reference to the accompanying drawings.
Drawings
FIG. 1 is a schematic diagram of a tubesheet frostless air source heat pump system according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of the structure of a tubesheet frostless air source heat pump system according to an embodiment of the present invention in a series regenerative heating mode;
FIG. 3 is a schematic diagram of a structure of a tubesheet frostless air source heat pump system according to an embodiment of the present invention in a parallel regenerative heating mode;
FIG. 4 is a schematic diagram of the structure of a tubesheet frostless air source heat pump system of an embodiment of the present invention in a conventional cooling mode;
fig. 5 is a schematic structural view of a tube-sheet frostless air source heat pump system according to an embodiment of the present invention in a conventional heating mode.
In the figure: 1: a compressor; 2: a four-way valve; 3: a condenser; 4: a first electromagnetic valve; 5: an expansion valve; 6: tube-plate heat exchanger; 7: a parallel electromagnetic valve; 8: a series connection electromagnetic valve; 9: a second electromagnetic valve; 10: regenerating the spray assembly; 11: a regenerative heat exchanger; 12: spraying an electromagnetic valve; 13: a regenerative spray pump; 14: a regenerative liquid reservoir; 15: a regenerated liquid return electromagnetic valve; 16: a liquid return electromagnetic valve of the surface cooler; 17: a drain pipe; 18: a water condensation plate; 19: a surface cooler; 20: a regeneration liquid inlet electromagnetic valve; 21: a tube sheet spray pump; 22: a filler; 23: a bypass solenoid valve; 24: a tube sheet liquid storage tank; 25: an air inlet grille; 26: a housing; 27: a blower; 28: a tube sheet spray assembly; 29: a liquid outlet pipe; 30: a second liquid inlet pipe; 31: a first liquid inlet pipe.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
Furthermore, in the description of the present invention, unless otherwise indicated, the meaning of "a plurality", "a plurality of groups" means two or more, and the meaning of "a plurality", "a plurality of roots", "a plurality of groups" means one or more.
As shown in fig. 1,2 and 3, the tube-sheet frostless air source heat pump system provided by the embodiment of the invention comprises a regenerative heat exchanger 11, a surface cooler 19, and a compressor 1, a four-way valve 2, a condenser 3 and a tube-sheet heat exchanger 6 which are sequentially communicated along a refrigerant circulation loop; the upper part and the lower part of the regenerative heat exchanger 11 are respectively provided with a regenerative spray assembly 10 and a regenerative liquid storage tank 14, the regenerative liquid storage tank 14 is communicated with the regenerative spray assembly 10, the regenerative heat exchanger 11 is provided with a first liquid inlet pipe 31 and a second liquid inlet pipe 30 which are arranged in parallel, the first liquid inlet pipe 31 is communicated with a liquid outlet of the condenser 3, the second liquid inlet pipe 30 is communicated with a liquid inlet of the condenser 3, and a liquid outlet pipe 29 of the regenerative heat exchanger 11 is communicated with a liquid outlet of the condenser 3; a tube plate spray assembly 28 and a tube plate liquid storage tank 24 are respectively arranged above and below the tube plate heat exchanger 6, a liquid inlet of the surface cooler 19 is communicated with the tube plate liquid storage tank 24, and a liquid outlet of the surface cooler 19 is communicated with the tube plate spray assembly 28; the air outlet of the regeneration heat exchanger 11 is communicated with the air inlet of the surface cooler 19, and the air inlet of the regeneration heat exchanger 11 is communicated with the air outlet of the surface cooler 19.
The outdoor side heat exchanger of the tube-plate frostless air source heat pump system is a tube-plate heat exchanger, can be converted into a high-efficiency tube-plate evaporation type condenser in summer, and meets the requirement of high-efficiency refrigeration.
The invention also provides a regeneration heat exchanger and a surface cooler, which are used as a regeneration device of antifreeze liquid sprayed to the tube plate heat exchanger by the tube plate type spray assembly when the system heats, and the tube plate heat exchanger has smaller water absorption capacity and lower proportion of latent heat to total heat under the normal condition, and the heat pump system starts a serial regeneration heating mode. The high-temperature high-pressure refrigerant gas at the outlet of the compressor firstly enters the condenser through the four-way valve to be condensed and released to supply heat for a user, then enters the regenerative heat exchanger through the first liquid inlet pipe to be further released to become supercooled liquid refrigerant, becomes low-temperature low-pressure two-phase refrigerant after being throttled by the expansion valve, then enters the tube plate type heat exchanger to absorb heat to become low-temperature low-pressure gaseous refrigerant, returns to the compressor to be recompressed into high-temperature high-pressure refrigerant gas, and is circulated repeatedly and continuously. The low-concentration antifreeze liquid circularly sprayed to the surface of the regeneration heat exchanger through the regeneration spray assembly from the regeneration liquid storage tank absorbs heat of the refrigerant, the temperature is increased, the saturated vapor partial pressure of the surface of the antifreeze liquid is increased and is higher than the vapor partial pressure of air entering the regeneration heat exchanger, moisture is transferred from solution to the air, the temperature and the humidity of the air are both increased, then the air flows out of the regeneration heat exchanger and enters the surface cooler, and as a part of low-temperature antifreeze liquid in the tube plate liquid storage tank flows into the surface cooler, the surface temperature of the surface cooler is lower than the dew point temperature of the air entering the surface cooler, the moisture in the air is condensed, the temperature of the air is reduced, the moisture content is reduced, and the air returns to the inlet of the regeneration heat exchanger to continue the next circulation. Thus, the water in the antifreeze in the regeneration liquid storage tank is continuously discharged out of the system, and the concentration is gradually increased, so that the regeneration is realized. The tube plate spraying assembly on the tube plate type heat exchanger sprays the antifreeze fluid on the surface of the tube plate type heat exchanger so as to prevent frosting, outdoor air flows through the outer side of the tube plate and exchanges heat with the antifreeze fluid, and finally heat is absorbed by two-phase low-temperature refrigerant in the tube plate. The antifreeze fluid flows into the liquid storage tank of the tube plate after heat exchange from the surface of the tube plate heat exchanger, then one part returns to the tube plate spraying assembly, the other part enters the surface cooler for heat exchange, and the antifreeze fluid returns to the tube plate spraying assembly after the temperature rises.
When the moisture content of the outdoor air is high, and the water absorption capacity of the tube-plate heat exchanger is high, the heat of the supercooled refrigerant at the outlet of the condenser is insufficient to meet the heat required by the regeneration of the antifreeze, and at the moment, the heat pump system starts a parallel regeneration heating mode. The high-temperature high-pressure refrigerant gas at the outlet of the compressor is divided into two paths after passing through the four-way valve, one path of the refrigerant gas enters the condenser to condense and release heat to supply heat for users, then enters the tube plate type heat exchanger after being throttled by the expansion valve, the other path of the refrigerant gas enters the regenerative heat exchanger through the second liquid inlet tube, the released heat becomes supercooled liquid refrigerant, the refrigerant gas becomes low-temperature low-pressure two-phase refrigerant after being throttled by the expansion valve, then enters the tube plate type heat exchanger to absorb heat and becomes low-temperature low-pressure gaseous refrigerant, and the refrigerant gas returns to the compressor to be compressed again to high-temperature high-pressure refrigerant gas, so that the cycle is repeated continuously. The low-concentration antifreeze liquid circularly sprayed to the surface of the regeneration heat exchanger through the regeneration spray assembly from the regeneration liquid storage tank absorbs heat of the refrigerant, the temperature is increased, the saturated vapor partial pressure of the surface of the antifreeze liquid is increased and is higher than the vapor partial pressure of air entering the regeneration heat exchanger, moisture is transferred from solution to the air, the temperature and the humidity of the air are both increased, then the air flows out of the regeneration heat exchanger and enters the surface cooler, and as a part of low-temperature antifreeze liquid in the tube plate liquid storage tank flows into the surface cooler, the surface temperature of the surface cooler is lower than the dew point temperature of the air entering the surface cooler, the moisture in the air is condensed, the temperature of the air is reduced, the moisture content is reduced, and the air returns to the inlet of the regeneration heat exchanger to continue the next circulation. Therefore, the water in the antifreeze in the regeneration liquid storage tank is continuously discharged out of the system, and the concentration is gradually increased, so that the regeneration is realized. The tube plate spraying assembly on the tube plate type heat exchanger sprays the antifreeze fluid on the surface of the tube plate type heat exchanger so as to prevent frosting, outdoor air flows through the outer side of the tube plate and exchanges heat with the antifreeze fluid, and finally heat is absorbed by two-phase low-temperature refrigerant in the tube plate. The antifreeze fluid flows into the liquid storage tank of the tube plate after heat exchange from the surface of the tube plate heat exchanger, then one part returns to the tube plate spraying assembly, the other part enters the surface cooler for heat exchange, and the antifreeze fluid returns to the tube plate spraying assembly after the temperature rises.
The invention can make corresponding change of the antifreeze regeneration mode according to the actual working condition, has strong adaptability and reliable and controllable operation, improves the stability and continuity of heat supply, has more obvious frost prevention effect, does not need to set an extra cold and heat source for antifreeze regeneration, reduces the equipment initial investment and the idle rate, and greatly reduces the energy consumption level, thereby improving the reliability, the comfort and the safety of heat supply.
As shown in fig. 2 and 3, an expansion valve 5 is arranged on a pipeline for communicating the condenser 3 with the tube-sheet type heat exchanger 6, a first electromagnetic valve 4 is also arranged on a pipeline for communicating the expansion valve 5 with the condenser 3, a liquid outlet pipe 29 of the regenerative heat exchanger 11 is communicated with a pipeline between the expansion valve 5 and the first electromagnetic valve 4, and a first liquid inlet pipe 31 is communicated with a pipeline between the first electromagnetic valve 4 and the condenser 3. Wherein, the first liquid inlet pipe 31 is provided with a series electromagnetic valve 8, the second liquid inlet pipe 30 is provided with a parallel electromagnetic valve 7, and the liquid outlet pipe 29 of the regenerative heat exchanger 11 is provided with a second electromagnetic valve 9. The first electromagnetic valve is positioned between the first liquid inlet pipe and the communication point of the liquid outlet pipe on the liquid outlet communicating pipe of the expansion valve and the condenser, the first electromagnetic valve and the parallel electromagnetic valve are closed, the series electromagnetic valve and the second electromagnetic valve are opened, the system can operate in a series regeneration heating mode, the first electromagnetic valve, the parallel electromagnetic valve and the second electromagnetic valve are opened, the series electromagnetic valve is closed, the system can operate in a parallel regeneration heating mode, and the refrigerant flows into the pipe plate type heat exchanger after being throttled and depressurized through the expansion valve.
Wherein, the liquid outlet of the surface cooler 19 is provided with a surface cooler liquid return electromagnetic valve 16 on a pipeline communicated with the tube plate spray assembly 28. Wherein, the below of surface cooler 19 is equipped with water-condensing disk 18, and water-draining pipe 17 is equipped with in water-condensing disk 18 bottom. The antifreeze in the tube plate liquid storage tank exchanges heat with air in the surface cooler and heats up, and flows back to the tube plate spray pipe assembly through the control of the liquid return electromagnetic valve, so that the problem of frosting on the surface of the tube plate type heat exchanger is prevented while the antifreeze is regenerated, condensed water condensed by heat exchange in the surface cooler flows into a water condensation plate, and water in the water condensation plate is discharged through a water drain pipe.
Wherein, the communication pipeline between the regeneration liquid storage pool 14 and the regeneration spray assembly 10 is sequentially provided with a regeneration spray pump 13 and a spray electromagnetic valve 12. After the refrigerant flows into the regeneration heat exchanger, the refrigerant exchanges heat with the antifreeze fluid sprayed out by the regeneration spray assembly, the antifreeze fluid exchanges heat with air, the temperature and the humidity of the air are increased, the antifreeze fluid after heat absorption enters the regeneration liquid storage tank, the regeneration liquid storage tank is connected with the regeneration spray assembly through the regeneration spray pump and the spray electromagnetic valve, and the concentration of the antifreeze fluid is increased continuously in a circulating spray mode.
Wherein, the regeneration liquid storage tank 14 is communicated with the tube plate liquid storage tank 24, and a regeneration liquid inlet electromagnetic valve 20 is arranged on the communicating pipeline. Wherein, the regeneration liquid storage tank 14 is communicated with the tube plate spray assembly 28, and a regeneration liquid return electromagnetic valve 15 is arranged on the communicating pipeline. Opening a regeneration liquid inlet electromagnetic valve, enabling the antifreeze in the tube plate liquid storage tank to flow into the regeneration liquid storage tank for spray regeneration of the regeneration heat exchanger, and absorbing heat by the antifreeze after spraying; after the antifreeze fluid regeneration is finished, a regenerated liquid return electromagnetic valve is opened, and the antifreeze fluid in the regenerated liquid storage tank can flow into a tube plate spraying assembly for spraying the heat exchanger during tube plate use.
Wherein, the connecting pipeline of the tube plate liquid storage tank 24 and the tube plate spray assembly 28 is sequentially provided with a tube plate spray pump 21 and a bypass electromagnetic valve 23. The tube plate spraying assembly sprays the tube plate type heat exchanger, the antifreeze fluid, the refrigerant and the air enter the tube plate liquid storage tank after heat exchange, and the tube plate liquid storage tank returns the antifreeze fluid to the tube plate spraying assembly through the tube plate spraying pump and the bypass electromagnetic valve, so that the circulating spraying use of the tube plate type heat exchanger on the antifreeze fluid is realized.
Wherein, the outside of tube sheet heat exchanger 6 is equipped with casing 26, and the top of casing 26 is equipped with fan 27, and the bottom of casing 26 is equipped with tube sheet liquid storage tank 24, still is equipped with air inlet grille 25 on the casing 26, is equipped with filler 22 between tube sheet heat exchanger 6 and the tube sheet liquid storage tank 24. As an air source heat pump, a tube-sheet type heat exchanger absorbs heat in air and exchanges heat with a refrigerant in the heat exchanger, so that an air inlet grille and a fan are arranged on an outer shell of the tube-sheet type heat exchanger to form air flow inside the shell.
As shown in fig. 4 and 5, when the regeneration heat exchanger and the surface cooler are not started, the flow direction of the high-temperature refrigerant discharged from the outlet of the compressor is changed through reversing of the four-way valve, and the system can be used as an air source heat pump for heating and cooling in a conventional state.
In summary, the outdoor side heat exchanger of the tube-plate frostless air source heat pump system is a tube-plate heat exchanger, and can be converted into a high-efficiency tube-plate evaporative condenser in summer, so that the requirement of high-efficiency refrigeration is met.
The invention also provides a regeneration heat exchanger and a surface cooler, which are used as a regeneration device of antifreeze liquid sprayed to the tube plate heat exchanger by the tube plate type spray assembly when the system heats, and the tube plate heat exchanger has smaller water absorption capacity and lower proportion of latent heat to total heat under the normal condition, and the heat pump system starts a serial regeneration heating mode. The high-temperature high-pressure refrigerant gas at the outlet of the compressor firstly enters the condenser through the four-way valve to be condensed and released to supply heat for a user, then enters the regenerative heat exchanger through the first liquid inlet pipe to be further released to become supercooled liquid refrigerant, becomes low-temperature low-pressure two-phase refrigerant after being throttled by the expansion valve, then enters the tube plate type heat exchanger to absorb heat to become low-temperature low-pressure gaseous refrigerant, returns to the compressor to be recompressed into high-temperature high-pressure refrigerant gas, and is circulated repeatedly and continuously. The low-concentration antifreeze liquid circularly sprayed to the surface of the regeneration heat exchanger through the regeneration spray assembly from the regeneration liquid storage tank absorbs heat of the refrigerant, the temperature is increased, the saturated vapor partial pressure of the surface of the antifreeze liquid is increased and is higher than the vapor partial pressure of air entering the regeneration heat exchanger, moisture is transferred from solution to the air, the temperature and the humidity of the air are both increased, then the air flows out of the regeneration heat exchanger and enters the surface cooler, and as a part of low-temperature antifreeze liquid in the tube plate liquid storage tank flows into the surface cooler, the surface temperature of the surface cooler is lower than the dew point temperature of the air entering the surface cooler, the moisture in the air is condensed, the temperature of the air is reduced, the moisture content is reduced, and the air returns to the inlet of the regeneration heat exchanger to continue the next circulation. Thus, the water in the antifreeze in the regeneration liquid storage tank is continuously discharged out of the system, and the concentration is gradually increased, so that the regeneration is realized. The tube plate spraying assembly on the tube plate type heat exchanger sprays the antifreeze fluid on the surface of the tube plate type heat exchanger so as to prevent frosting, outdoor air flows through the outer side of the tube plate and exchanges heat with the antifreeze fluid, and finally heat is absorbed by two-phase low-temperature refrigerant in the tube plate. The antifreeze fluid flows into the liquid storage tank of the tube plate after heat exchange from the surface of the tube plate heat exchanger, then one part returns to the tube plate spraying assembly, the other part enters the surface cooler for heat exchange, and the antifreeze fluid returns to the tube plate spraying assembly after the temperature rises.
When the moisture content of the outdoor air is high, and the water absorption capacity of the tube-plate heat exchanger is high, the heat of the supercooled refrigerant at the outlet of the condenser is insufficient to meet the heat required by the regeneration of the antifreeze, and at the moment, the heat pump system starts a parallel regeneration heating mode. The high-temperature high-pressure refrigerant gas at the outlet of the compressor is divided into two paths after passing through the four-way valve, one path of the refrigerant gas enters the condenser to condense and release heat to supply heat for users, then enters the tube plate type heat exchanger after being throttled by the expansion valve, the other path of the refrigerant gas enters the regenerative heat exchanger through the second liquid inlet tube, the released heat becomes supercooled liquid refrigerant, the refrigerant gas becomes low-temperature low-pressure two-phase refrigerant after being throttled by the expansion valve, then enters the tube plate type heat exchanger to absorb heat and becomes low-temperature low-pressure gaseous refrigerant, and the refrigerant gas returns to the compressor to be compressed again to high-temperature high-pressure refrigerant gas, so that the cycle is repeated continuously. The low-concentration antifreeze liquid circularly sprayed to the surface of the regeneration heat exchanger through the regeneration spray assembly from the regeneration liquid storage tank absorbs heat of the refrigerant, the temperature is increased, the saturated vapor partial pressure of the surface of the antifreeze liquid is increased and is higher than the vapor partial pressure of air entering the regeneration heat exchanger, moisture is transferred from solution to the air, the temperature and the humidity of the air are both increased, then the air flows out of the regeneration heat exchanger and enters the surface cooler, and as a part of low-temperature antifreeze liquid in the tube plate liquid storage tank flows into the surface cooler, the surface temperature of the surface cooler is lower than the dew point temperature of the air entering the surface cooler, the moisture in the air is condensed, the temperature of the air is reduced, the moisture content is reduced, and the air returns to the inlet of the regeneration heat exchanger to continue the next circulation. Therefore, the water in the antifreeze in the regeneration liquid storage tank is continuously discharged out of the system, and the concentration is gradually increased, so that the regeneration is realized. The tube plate spraying assembly on the tube plate type heat exchanger sprays the antifreeze fluid on the surface of the tube plate type heat exchanger so as to prevent frosting, outdoor air flows through the outer side of the tube plate and exchanges heat with the antifreeze fluid, and finally heat is absorbed by two-phase low-temperature refrigerant in the tube plate. The antifreeze fluid flows into the liquid storage tank of the tube plate after heat exchange from the surface of the tube plate heat exchanger, then one part returns to the tube plate spraying assembly, the other part enters the surface cooler for heat exchange, and the antifreeze fluid returns to the tube plate spraying assembly after the temperature rises.
The invention can make corresponding change of the antifreeze regeneration mode according to the actual working condition, has strong adaptability and reliable and controllable operation, improves the stability and continuity of heat supply, has more obvious frost prevention effect, does not need to set an extra cold and heat source for antifreeze regeneration, reduces the equipment initial investment and the idle rate, and greatly reduces the energy consumption level, thereby improving the reliability, the comfort and the safety of heat supply.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (7)
1. A tubesheet frostless air source heat pump system characterized in that: the device comprises a regeneration heat exchanger, a surface cooler, a compressor, a four-way valve, a condenser and a tube plate heat exchanger which are sequentially communicated along a refrigerant circulation loop; the upper part and the lower part of the regenerative heat exchanger are respectively provided with a regenerative spray assembly and a regenerative liquid storage tank, the regenerative liquid storage tank is communicated with the regenerative spray assembly, the regenerative heat exchanger is provided with a first liquid inlet pipe and a second liquid inlet pipe which are arranged in parallel, the first liquid inlet pipe is communicated with a liquid outlet of the condenser, the second liquid inlet pipe is communicated with a liquid inlet of the condenser, and a liquid outlet pipe of the regenerative heat exchanger is communicated with a liquid outlet of the condenser; a tube plate spray assembly and a tube plate liquid storage tank are respectively arranged above and below the tube plate type heat exchanger, a liquid inlet of the surface cooler is communicated with the tube plate liquid storage tank, and a liquid outlet of the surface cooler is communicated with the tube plate spray assembly; the air outlet of the regeneration heat exchanger is communicated with the air inlet of the surface cooler, and the air inlet of the regeneration heat exchanger is communicated with the air outlet of the surface cooler;
a liquid outlet of the surface cooler is communicated with the tube plate spray assembly, and a liquid return electromagnetic valve of the surface cooler is arranged on a pipeline; the regeneration liquid storage pool is communicated with the tube plate liquid storage pool, and a regeneration liquid inlet electromagnetic valve is arranged on a communicating pipeline; the regeneration liquid storage pool is communicated with the tube plate spray assembly, and a regeneration liquid return electromagnetic valve is arranged on a communicating pipeline.
2. The tubesheet frostless air source heat pump system of claim 1 wherein: the condenser with be equipped with the expansion valve on the pipeline of tube sheet heat exchanger intercommunication, the expansion valve with still be equipped with first solenoid valve on the pipeline of condenser intercommunication, the drain pipe of regenerator with the expansion valve with pipeline intercommunication between the first solenoid valve, first feed liquor pipe with first solenoid valve with pipeline intercommunication between the condenser.
3. The tubesheet frostless air source heat pump system of claim 2 wherein: the first liquid inlet pipe is provided with a series electromagnetic valve, the second liquid inlet pipe is provided with a parallel electromagnetic valve, and the liquid outlet pipe of the regenerative heat exchanger is provided with a second electromagnetic valve.
4. The tubesheet frostless air source heat pump system of claim 1 wherein: the water condensation plate is arranged below the surface cooler, and the drain pipe is arranged at the bottom of the water condensation plate.
5. The tubesheet frostless air source heat pump system of claim 1 wherein: and a regeneration spray pump and a spray electromagnetic valve are sequentially arranged on the communication pipeline of the regeneration liquid storage pool and the regeneration spray assembly.
6. The tubesheet frostless air source heat pump system of claim 1 wherein: and a tube plate spray pump and a bypass electromagnetic valve are sequentially arranged on a connecting pipeline of the tube plate liquid storage pool and the tube plate spray assembly.
7. The tubesheet frostless air source heat pump system of claim 1 wherein: the outside of tube sheet heat exchanger is equipped with the casing, the top of casing is equipped with the fan, the bottom of casing is equipped with the tube sheet liquid storage tank, still be equipped with the air inlet grid on the casing, tube sheet heat exchanger with be equipped with the filler between the tube sheet liquid storage tank.
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| CN111928514A (en) * | 2020-06-01 | 2020-11-13 | 重庆通用工业(集团)有限责任公司 | Plate tube heat pump system of evaporation cooling unit |
| CN112283824B (en) * | 2020-09-29 | 2024-10-25 | 北京金茂绿建科技有限公司 | Heat source tower device |
| CN112923616B (en) * | 2021-01-30 | 2021-11-23 | 清华大学 | Air source CO for preventing evaporator from frosting by using heat of heat regenerator2Heat pump system |
| CN113175711A (en) * | 2021-03-31 | 2021-07-27 | 苏州久之新能源科技有限公司 | Air energy efficiency increasing system and method |
| CN113654282B (en) * | 2021-09-01 | 2024-03-19 | 深圳市派沃新能源科技股份有限公司 | Defrosting system of air source heat pump and defrosting judgment method |
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| CN1438463A (en) * | 2003-03-20 | 2003-08-27 | 上海交通大学 | Secondary-refrigrant refrigerator |
| CN106196780A (en) * | 2016-07-27 | 2016-12-07 | 南京理工大学 | A kind of high-efficient solution defrosting air friction drag |
| CN208547139U (en) * | 2018-06-21 | 2019-02-26 | 清华大学 | A kind of tube-sheet type Frostless air-source heat pump system |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1438463A (en) * | 2003-03-20 | 2003-08-27 | 上海交通大学 | Secondary-refrigrant refrigerator |
| CN106196780A (en) * | 2016-07-27 | 2016-12-07 | 南京理工大学 | A kind of high-efficient solution defrosting air friction drag |
| CN208547139U (en) * | 2018-06-21 | 2019-02-26 | 清华大学 | A kind of tube-sheet type Frostless air-source heat pump system |
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