CN111219910A - Frostless air source cascade heat pump for solution icing - Google Patents
Frostless air source cascade heat pump for solution icing Download PDFInfo
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- CN111219910A CN111219910A CN201911294200.1A CN201911294200A CN111219910A CN 111219910 A CN111219910 A CN 111219910A CN 201911294200 A CN201911294200 A CN 201911294200A CN 111219910 A CN111219910 A CN 111219910A
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- 239000007788 liquid Substances 0.000 claims abstract description 56
- 238000010438 heat treatment Methods 0.000 claims abstract description 49
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 32
- 238000007710 freezing Methods 0.000 claims abstract description 23
- 230000008014 freezing Effects 0.000 claims abstract description 23
- 230000008929 regeneration Effects 0.000 claims abstract description 20
- 238000011069 regeneration method Methods 0.000 claims abstract description 20
- 238000007599 discharging Methods 0.000 claims abstract description 13
- 239000003507 refrigerant Substances 0.000 claims description 25
- 238000005192 partition Methods 0.000 claims description 10
- 239000007921 spray Substances 0.000 claims description 7
- 230000000694 effects Effects 0.000 abstract description 9
- 230000002528 anti-freeze Effects 0.000 description 8
- 238000000034 method Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 238000005265 energy consumption Methods 0.000 description 2
- 238000004108 freeze drying Methods 0.000 description 2
- XSHGVIPHMOTDCS-UHFFFAOYSA-N 1-(5-fluoropentyl)-n-(2-phenylpropan-2-yl)indazole-3-carboxamide Chemical compound N=1N(CCCCCF)C2=CC=CC=C2C=1C(=O)NC(C)(C)C1=CC=CC=C1 XSHGVIPHMOTDCS-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000005485 electric heating Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
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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
- F25B30/00—Heat pumps
- F25B30/06—Heat pumps characterised by the source of low potential heat
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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
- F25B41/00—Fluid-circulation arrangements
- F25B41/30—Expansion means; Dispositions thereof
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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
- F25B47/00—Arrangements for preventing or removing deposits or corrosion, not provided for in another subclass
- F25B47/02—Defrosting cycles
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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
- F25B7/00—Compression machines, plants or systems, with cascade operation, i.e. with two or more circuits, the heat from the condenser of one circuit being absorbed by the evaporator of the next circuit
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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
- F25B2347/00—Details for preventing or removing deposits or corrosion
- F25B2347/02—Details of defrosting cycles
-
- 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
- F25B2600/00—Control issues
- F25B2600/25—Control of valves
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Steam Or Hot-Water Central Heating Systems (AREA)
Abstract
The invention provides a frostless air source cascade heat pump for removing water by solution, which comprises a cascade heating cycle and an icing and water removing cycle; the freezing and dewatering circulation comprises a solution heat exchange pipeline, a storage liquid circulation pipeline and a solution regeneration pipeline, wherein the solution heat exchange pipeline comprises an evaporator, a heat exchange tower, a second stop valve and a first pump; the storage solution circulating pipeline comprises a dilute solution discharging pipeline and a concentrated solution circulating pipeline, the dilute solution discharging pipeline comprises a second pump and a first liquid storage tank, and the concentrated solution circulating pipeline comprises a second liquid storage tank and a first pump; the solution regeneration pipeline comprises a first throttle valve, a dehydrator, a first liquid storage tank and a third pump. The frostless air source cascade heat pump can realize three operation modes of heating, freezing and dewatering, deicing and the like, ensures the continuous operation of heating and the regeneration effect of solution, has lower floor area and investment cost, is simple to operate, saves the consumption of heat energy, and improves the energy efficiency of the frostless air source heat pump system.
Description
Technical Field
The invention belongs to the technical field of heat pumps, and particularly relates to a frostless air source cascade heat pump for solution regeneration based on freezing and dewatering.
Background
The frostless air source cascade heat pump cycle is taken as an efficient energy-saving system, caters to an energy-saving policy proposed by the twelve-five planning of China, and is greatly supported. However, due to limited technology, there are still many areas to be improved for the frost-free air source cascade heat pump cycle. The problem of how to increase the concentration of the antifreeze solution more energy-saving after the antifreeze solution is diluted in the frostless air source cascade heat pump cycle is still being explored. When the frostless air source cascade heat pump cycle is used for heating in winter, because air in winter contains certain moisture, in the process of contact heat exchange between the antifreeze solution cycle and the air, the moisture in the air is continuously dissolved in the antifreeze solution after being cooled to dilute the antifreeze solution, and in order to separate and remove the moisture in the antifreeze solution, the prior art adopts various heating and drying methods such as electric heating, fuel boiler heating or solar heating, but the heating methods all cause the problems of increased energy consumption, increased investment and increased operation cost of the system.
The existing patent proposes that the moisture in the antifreeze is removed by adopting a freezing regeneration mode, the regeneration effect is good, but the heating operation needs to be stopped in the regeneration process, or an independent heat pump unit needs to be adopted to provide cold for solution regeneration so as to ensure the normal operation of a user side unit, the two sets of units not only increase the occupied area and the investment cost, but also bring great inconvenience to the adjustment of the system, and the system is difficult to be applied to practical occasions.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention provides the frostless air source air-supply enthalpy-increasing heat pump for removing water by the solution, which has the advantages of higher efficiency, lower energy consumption and good energy-saving efficiency.
In order to achieve the purpose, the invention adopts the following technical scheme:
the frostless air source cascade heat pump for freezing the solution comprises a cascade heating cycle and a freezing and dewatering cycle; the cascade heating cycle comprises a first compressor, a second compressor, a condenser, a first throttle valve, a second throttle valve, an evaporative condenser and an evaporator; the freezing and dewatering cycle comprises a solution heat exchange pipeline, a storage liquid circulation pipeline and a solution regeneration pipeline, wherein the solution heat exchange pipeline comprises an evaporator, a heat exchange tower, a second stop valve and a first pump, the solution in the heat exchange tower is sent to the evaporator through the second stop valve and the first pump, and returns to the top of the heat exchange tower after exchanging heat with the refrigerant in the evaporator; the storage liquid circulating pipeline comprises a dilute solution discharging pipeline and a concentrated solution circulating pipeline, the dilute solution discharging pipeline comprises a second pump and a first liquid storage tank, and dilute solution at the bottom of the heat exchange tower is discharged into the first liquid storage tank through the second pump; the concentrated solution circulating pipeline comprises a second liquid storage tank and a first pump, and concentrated solution in the second liquid storage tank is conveyed to the evaporator through a sixth stop valve and the first pump; the solution regeneration pipeline comprises a first throttling valve, a dehydrator, a first liquid storage tank and a third pump, wherein part of refrigerant flowing out of the first throttling valve flows to a second inlet of the dehydrator through a third stop valve, and a second outlet of the dehydrator is communicated to the compressor; a dilute solution outlet of the first liquid storage tank is communicated with a first inlet of the dehydrator through a seventh stop valve, and the first outlet of the dehydrator is connected with an inlet of a third pump; the outlet of the third pump is respectively communicated with the concentrated solution inlet of the first liquid storage tank through a fourth stop valve and communicated with the concentrated solution inlet of the second liquid storage tank through a fifth stop valve
The invention also comprises a deicing cycle, wherein the deicing cycle comprises an eighth stop valve and a dehydrator, the eighth stop valve is connected with the first stop valve in parallel, a refrigerant outlet of the condenser is communicated to a third inlet of the dehydrator through the eighth stop valve, and a third outlet of the dehydrator is communicated to an inlet of the first throttle valve.
One of the preferable modes of the present invention includes a normal heating mode, a heating + icing and de-icing mode, and a heating + de-icing mode.
As one of the preferable schemes of the invention, in the heating + icing water removal mode, when the solution at the first outlet of the water remover does not meet the requirement, the solution is delivered to the first liquid storage tank through the third pump and the fourth stop valve; when the solution at the first outlet of the dehydrator meets the requirement, the solution is conveyed to the second liquid storage tank through the third pump and the fifth stop valve, and the concentrated solution in the second liquid storage tank is conveyed to the evaporator through the first pump.
As one of the preferable schemes of the invention, the heat exchange tower comprises a solution tank and a heat exchange cavity body positioned above the solution tank, and the solution at the top of the heat exchange tower flows into the solution tank after contacting with air for heat exchange in the heat exchange cavity body.
As one of the preferable schemes of the invention, the dehydrator comprises an ice forming chamber, a partition plate and a liquid storage chamber which are arranged from top to bottom, wherein the ice forming chamber is internally provided with an ice making disc and an icing heat exchange tube arranged on the back of the ice making disc, and a solution spray head is arranged on one side of the front surface of the ice making disc and sprays solution to the surface of the ice making disc; after the solution exchanges heat with the refrigerant in the icing heat exchange tube, the ice blocks are attached to the surface of the refrigerating disc, and the unfrozen water and the solution enter the liquid storage chamber through the holes in the partition plate.
As one preferable scheme of the invention, the back of the ice making tray is also provided with an ice removing heat exchange pipe, one side of the bottom of the ice forming chamber is provided with an ice discharging port, and ice blocks fall off from the surface of the ice making tray and are discharged through the ice discharging port after being heated by refrigerant in the ice removing heat exchange pipe.
As one preferable aspect of the present invention, the partition plate is inclined downward toward the ice discharge opening.
As one preferable scheme of the invention, the front surface of the ice-making tray is provided with a plurality of ice-making grooves.
Compared with the prior art, the invention has the beneficial effects that: compared with the traditional frostless air source cascade heat pump, the invention can realize three operation modes of heating, freezing and water removal, deicing and the like, can ensure the continuous operation of heating and the regeneration effect of solution, can also maintain the water removal effect of the dehydrator by using the residual heat of the refrigerant, has lower floor area and investment cost, simple operation, saves the consumption of heat energy and improves the energy efficiency of the frostless air source heat pump system.
Drawings
FIG. 1 is a schematic diagram of the heat pump assembly of the present invention;
FIG. 2 is a schematic diagram of a water eliminator in a heat pump according to the present invention;
FIG. 3 is a schematic flow diagram of the heat pump of the present invention in a normal heating mode;
FIG. 4-1 is a schematic view of a stage one of the heat pump of the present invention in a heating + freeze de-watering mode;
FIG. 4-2 is a schematic view of a heat pump of the present invention in a heating + freeze-drying mode at stage two;
4-3 are schematic diagrams of a heat pump of the present invention at stage three in a heating + freeze-drying mode;
fig. 5 is a schematic flow chart of the heat pump of the present invention in a heating + deicing mode.
In the figure, 1-a condenser, 2-a first compressor, 3-a second compressor, 4-an evaporator, 5-a first throttle valve, 6-a second throttle valve, 7-a condensing evaporator, 8-a heat exchange tower, 9-a first pump, 10-a second pump, 11-a third pump, 12-a first liquid storage tank, 13-a second liquid storage tank and 14-a dehydrator; 21-a first stop valve, 22-a second stop valve, 23-a third stop valve; 24-a fourth stop valve, 25-a fifth stop valve, 26-a sixth stop valve, 27-a seventh stop valve, 28-an eighth stop valve;
a-a first inlet of the dehydrator, b-a first outlet of the dehydrator, c-a second inlet of the dehydrator, d-a second outlet of the dehydrator, e-a third inlet of the dehydrator and f-a third outlet of the dehydrator;
a-ice discharge port, B-clapboard, C-liquid storage chamber, D-ice making tray, E-solution nozzle and F-heat exchange tube.
Detailed Description
The technical solution of the present invention will be further explained below.
As shown in fig. 1, the frostless air source cascade heat pump for freezing solution in the embodiment includes a cascade heating cycle and a freezing and dewatering cycle; the cascade heating cycle comprises a first compressor 2, a second compressor 3, a condenser, a first throttle valve 5, a second throttle valve 6, an evaporative condenser 7 and an evaporator 4; the condenser 1 provides heat to the user side and the evaporator 4 absorbs heat from the solution.
The freezing and dewatering cycle comprises a solution heat exchange pipeline, a storage liquid circulation pipeline and a solution regeneration pipeline, wherein the solution heat exchange pipeline comprises an evaporator 4, a heat exchange tower 8, a second stop valve 22 and a first pump 9, the solution in the heat exchange tower 8 is sent to the evaporator 4 through the second stop valve 22 and the first pump 9, and returns to the top of the heat exchange tower 8 after exchanging heat with the refrigerant in the evaporator 4; the storage solution circulating pipeline comprises a dilute solution discharging pipeline and a concentrated solution circulating pipeline, the dilute solution discharging pipeline comprises a second pump 10 and a first liquid storage tank 12, and the dilute solution at the bottom of the heat exchange tower 8 is discharged into the first liquid storage tank 12 through the second pump 10; the concentrated solution circulating pipeline comprises a second liquid storage tank 13 and a first pump 9, and concentrated solution in the second liquid storage tank 13 is conveyed to the evaporator 4 through a sixth stop valve 26 and the first pump 9; the solution regeneration pipeline comprises a first throttling valve 5, a dehydrator 14, a first liquid storage tank 12 and a third pump 10, wherein part of the refrigerant flowing out of the first throttling valve 5 flows to a second inlet c of the dehydrator 14 through a third stop valve 23, and a second outlet d of the dehydrator 14 is communicated to the compressor 2; the dilute solution outlet of the first liquid storage tank 12 is communicated with a first inlet a of the dehydrator 14 through a seventh stop valve 27, and a first outlet b of the dehydrator 14 is connected with the inlet of the third pump 11; the outlet of the third pump 11 is respectively communicated with the concentrated solution inlet of the first liquid storage tank 12 through a fourth stop valve 24 and communicated with the concentrated solution inlet of the second liquid storage tank 13 through a fifth stop valve 25.
According to the frostless air source cascade heat pump for removing water from the solution, partial cold energy of the cascade heating circulation is adopted to freeze and remove water from partial solution introduced into the water remover, and the continuous operation of the heating circulation can be ensured by combining the liquid storage circulation of the liquid storage tank, the regeneration effect can be improved, and the operation timeliness of the frostless air source heat pump can be improved.
The frostless air source cascade heat pump of the embodiment further comprises a deicing cycle, wherein the deicing cycle comprises an eighth stop valve 28 and a dehydrator 14, the eighth stop valve 28 is connected in parallel with the first stop valve 21, a refrigerant outlet of the condenser 1 is communicated to a third inlet e of the dehydrator 14 through the eighth stop valve 28, and a third outlet f of the dehydrator 14 is communicated to an inlet of the second throttle valve 6. When the dehydrator operates for a certain time, the freezing quantity is gradually increased, partial heat of the air-supplying enthalpy-increasing heating cycle is used for heating and deicing to ensure the dehydrating effect of the dehydrator, the heating is fast, and the structure is simple.
The heat exchange tower 8 adopted in this embodiment includes a solution tank and a heat exchange cavity located above the solution tank, and the solution at the top of the heat exchange tower flows into the solution tank after contacting with air for heat exchange in the heat exchange cavity. Preferably, the solution at the top of the heat exchange tower is sprayed by the spraying device and then directly contacts with the air to increase the contact area, and because the temperature of the solution after heat exchange is lower than that of the air, water in the air is continuously dissolved in the solution after being cooled, so that the concentration of the solution is gradually reduced, and therefore after the solution in the solution tank circulates for a period of time, the solution regeneration is required to be carried out certainly, and the continuous heating effect can be kept.
As shown in fig. 2, the water remover 14 adopted in this embodiment includes an icing chamber, a partition B and a liquid storage chamber C arranged from top to bottom, an ice making tray D and a heat exchange tube F tightly attached to the back of the ice making tray are arranged in the icing chamber, the heat exchange tube F includes an icing heat exchange tube and a de-icing heat exchange tube arranged in parallel, two ends of the icing heat exchange tube are respectively a second inlet C and a second outlet D of the water remover, and two ends of the de-icing heat exchange tube are respectively connected to a third inlet e and a third outlet F of the water remover.
The solution spray head E is arranged on one side of the front surface of the ice making disc D, and the inlet of the solution spray head E is connected with the first inlet a of the dehydrator, namely, the solution enters the icing chamber from the opening a and is sprayed to the surface of the ice making disc D through the solution spray head E; after the solution exchanges heat with the refrigerant in the freezing heat exchange tube, the ice cubes are attached to the grooves in the surface of the refrigerating disc D, unfrozen water and the solution enter the liquid storage chamber C through the holes in the partition plate B, the bottom of the liquid storage chamber C is provided with a first outlet B, and the regenerated solution flows out of the solution tank of the heat exchange tower 8 through the first outlet B.
In the embodiment, the ice discharging port A is formed in one side of the bottom of the icing chamber, and when the icing amount in the water eliminator is large, ice cubes fall off from the surface of the ice making tray and are discharged through the ice discharging port A after being heated by refrigerant in the ice removing heat exchange pipe. The ice discharge port A can be opened or closed manually or automatically to prevent unfrozen solution from flowing out of the ice discharge port. Meanwhile, in order to better discharge the ice blocks, the partition plate B is inclined downwards towards the ice discharge opening A, so that the discharging time of the ice blocks is prolonged.
The frostless air source cascade heat pump for removing water by using the solution can realize three operation modes, namely a common heating mode, a heating and icing and water removing mode and a heating and deicing mode, and the specific process is as follows:
as shown in fig. 3, in the normal heating mode, the first cut-off valve 21, the first and second throttle valves 5 and 6, the second cut-off valve 22, and the first pump 9 are opened. The refrigerant is discharged by the first compressor 2 and then returns to the first compressor through the condenser 1, the first stop valve 21, the second throttle valve 6 and the condensing evaporator 7 in sequence; the refrigerant is discharged by the second compressor 3, then sequentially passes through the condensing evaporator 7, the first throttling valve 5 and the evaporator 4, and then returns to the second compressor 3; the solution is conveyed into the evaporator 4 through the bottom of the heat exchange tower 8 by the first pump 9, and returns to the top of the heat exchange tower 8 after heat exchange. In this mode, the condenser 1 supplies heat to the user side, and the refrigerant in the evaporator 4 continuously absorbs heat of the solution to maintain the heating load.
As shown in fig. 4-1 to 4-3, in the heating + freezing dewatering mode, normal heating is performed, and after a period of circulation, the concentration of the solution flowing out of the second outlet of the evaporator is slowly reduced, the mode goes through three stages:
stage one is shown in fig. 4-1, which is the circulation of the storage liquid in the second storage tank: the second pump 10 is started, the dilute solution in the heat exchange tower 8 enters the first liquid storage tank 12, when the dilute solution in the heat exchange tower 8 is to be drained, the sixth stop valve 26 is started, the second stop valve 22 and the second pump 10 are closed, the concentrated solution in the second liquid storage tank 13 enters the first evaporator 4 through the sixth stop valve 26 and the first pump 9 to exchange heat with the refrigerant and enters the heat exchange tower 8, after the concentrated solution in the second liquid storage tank 13 is drained, the sixth stop valve 26 is closed, the second stop valve 22 is opened, and the normal circulation of the solution is maintained.
Stage two is shown in fig. 4-2, which is a solution regeneration cycle: the third stop valve 23, the seventh stop valve 27, the third pump 11, and the fourth stop valve 24 are opened. The dilute solution in the first storage tank 12 enters the dehydrator 15 through the seventh stop valve 27. Part of the refrigerant flowing out of the first expansion valve 5 enters the second inlet of the dehydrator 15, the solution flowing into the dehydrator 15 is sprayed onto the ice making tray D with grooves in the dehydrator by the solution spray head E, because there is a difference in the concentration of the refrigerant flowing into the dehydrator and the evaporator, the water in the solution sprayed onto the ice making tray is frozen, (and the solution in the evaporator is not frozen), meanwhile, the temperature and pressure of the refrigerant passing through the dehydrator 18 can be changed by adjusting the second expansion valve 6, so that the freezing process is better performed, and the water and the antifreeze not frozen in the dehydrator 15 become a concentrated solution, flow into the liquid storage chamber C through the holes in the partition plate B in the dehydrator, flow out along the first outlet B of the dehydrator 14, and return to the first liquid storage tank 12 through the third pump 11 and the fourth stop valve 24. The solution circulates in such a way that the concentration gradually rises and the water continues to freeze into ice.
And in the third stage, as shown in fig. 4-3, when the solution flowing out of the first outlet b of the dehydrator 14 meets the concentration requirement, the fourth stop valve 24 is closed, the fifth stop valve 25 is opened, the solution enters the second storage tank 11 through the third pump 11 and the fifth stop valve 25, and when the second storage tank 11 is filled with the concentrated solution, the sixth stop valve 26 is opened, so that the concentrated solution enters the solution circulation pipeline. When the solution concentration meets the requirement, the solution regeneration circulating pipeline and the sixth stop valve can be closed, and the solution circulation in the normal heating mode is maintained.
As shown in fig. 5, in the heating and deicing mode, normal heating is performed, and the first stop valve 21, the third to seventh stop valves 23 to 27, the second pump 10, and the third pump 11 are closed; the eighth cut-off valve 28 is opened. The hot refrigerant from the condenser 1 flows in from the third inlet c of the dehydrator 14 through the eighth stop valve 28, exchanges heat with the ice-making tray in the dehydrator, and ice cubes attached to the surface of the ice-making tray fall off due to heating of the ice-making tray, and the fallen ice cubes flow out along the ice discharge port a.
Compared with the traditional frostless air source cascade heat pump, the invention can realize three operation modes of heating, freezing and water removal, deicing and the like, can ensure the continuous operation of heating and the regeneration effect of solution, can also maintain the water removal effect of the water remover by using the residual heat of the refrigerant, has lower floor area and investment cost, is simple to operate, saves the consumption of heat energy, and improves the energy efficiency of the frostless air source heat pump system.
It should be noted that the above embodiments can be freely combined as necessary. The foregoing has outlined rather broadly the preferred embodiments and principles of the present invention and it will be appreciated that those skilled in the art may devise variations of the present invention that are within the spirit and scope of the appended claims.
Claims (9)
1. The frostless air source cascade heat pump for freezing the solution is characterized by comprising a cascade heating cycle and a freezing and dewatering cycle; the cascade heating cycle comprises a first compressor, a second compressor, a condenser, a first throttle valve, a second throttle valve, an evaporative condenser and an evaporator;
the freezing and dewatering circulation comprises a solution heat exchange pipeline, a storage liquid circulation pipeline and a solution regeneration pipeline, wherein,
the solution heat exchange pipeline comprises an evaporator, a heat exchange tower, a second stop valve and a first pump, wherein the solution in the heat exchange tower is sent to the evaporator through the second stop valve and the first pump, exchanges heat with a refrigerant in the evaporator and then returns to the top of the heat exchange tower;
the storage liquid circulating pipeline comprises a dilute solution discharging pipeline and a concentrated solution circulating pipeline, the dilute solution discharging pipeline comprises a second pump and a first liquid storage tank, and dilute solution at the bottom of the heat exchange tower is discharged into the first liquid storage tank through the second pump; the concentrated solution circulating pipeline comprises a second liquid storage tank and a first pump, and concentrated solution in the second liquid storage tank is conveyed to the evaporator through a sixth stop valve and the first pump;
the solution regeneration pipeline comprises a first throttling valve, a dehydrator, a first liquid storage tank and a third pump, wherein part of refrigerant flowing out of the first throttling valve flows to a second inlet of the dehydrator through a third stop valve, and a second outlet of the dehydrator is communicated to the compressor; a dilute solution outlet of the first liquid storage tank is communicated with a first inlet of the dehydrator through a seventh stop valve, and the first outlet of the dehydrator is connected with an inlet of a third pump; the outlet of the third pump is respectively communicated with the concentrated solution inlet of the first liquid storage tank through a fourth stop valve and communicated with the concentrated solution inlet of the second liquid storage tank through a fifth stop valve.
2. The frost-free air-source cascade heat pump for freezing solution according to claim 1, further comprising a de-icing cycle, wherein the de-icing cycle comprises an eighth stop valve and a de-water device, the eighth stop valve is connected in parallel with the first stop valve, a refrigerant outlet of the condenser is communicated to a third inlet of the de-water device through the eighth stop valve, and a third outlet of the de-water device is communicated to a second throttle inlet.
3. The solution icing frostless air-source cascade heat pump according to claim 2, comprising a normal heating mode, a heating + icing-de-icing mode, and a heating + de-icing mode.
4. The frostless air source cascade heat pump for icing solution according to claim 3, wherein in the heating + icing water removal mode, when the solution at the first outlet of the water remover does not meet the requirement, the solution is delivered to the first liquid storage tank through the third pump and the fourth stop valve; when the solution at the first outlet of the dehydrator meets the requirement, the solution is conveyed to the second liquid storage tank through the third pump and the fifth stop valve, and the concentrated solution in the second liquid storage tank is conveyed to the evaporator through the first pump.
5. The frost-free air-source-overlapped heat pump for freezing solution according to claim 4, wherein the heat exchange tower comprises a solution tank and a heat exchange cavity above the solution tank, and the solution at the top of the heat exchange tower flows into the solution tank after contacting with air and exchanging heat in the heat exchange cavity.
6. The frost-free air source cascade heat pump for icing solution according to claim 4, wherein the dehydrator comprises an icing chamber, a partition plate and a liquid storage chamber which are arranged from top to bottom, an ice making tray and an icing heat exchange pipe arranged on the back of the ice making tray are arranged in the icing chamber, and the solution nozzle is arranged on one side of the front of the ice making tray and sprays the solution to the surface of the ice making tray; after the solution exchanges heat with the refrigerant in the icing heat exchange tube, the ice blocks are attached to the surface of the refrigerating disc, and the unfrozen water and the solution enter the liquid storage chamber through the holes in the partition plate.
7. The frost-free air source cascade heat pump for icing solution according to claim 6, wherein the ice making tray is further provided with a de-icing heat exchange pipe on the back, one side of the bottom of the icing chamber is provided with an ice discharge port, and ice cubes are heated by refrigerant in the de-icing heat exchange pipe, fall off from the surface of the ice making tray and are discharged through the ice discharge port.
8. The frost-free air-source-cascade heat pump for freezing a solution according to claim 7, wherein the partition plate is inclined downward toward the ice discharge port.
9. The frost-free air-source-cascade heat pump for freezing a solution according to claim 8, wherein the ice-making tray has a plurality of ice-making grooves formed in a front surface thereof.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911294200.1A CN111219910A (en) | 2019-12-16 | 2019-12-16 | Frostless air source cascade heat pump for solution icing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911294200.1A CN111219910A (en) | 2019-12-16 | 2019-12-16 | Frostless air source cascade heat pump for solution icing |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111219910A true CN111219910A (en) | 2020-06-02 |
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| CN201911294200.1A Pending CN111219910A (en) | 2019-12-16 | 2019-12-16 | Frostless air source cascade heat pump for solution icing |
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| KR101206794B1 (en) * | 2012-10-18 | 2012-11-30 | (주) 액트 | Heat Pump System With 2- Stage cascade Refrigeration Cycle |
| CN104214984A (en) * | 2014-09-12 | 2014-12-17 | 河南科技大学 | Auto-cascade energy tower heat pump system |
| CN105928200A (en) * | 2016-04-28 | 2016-09-07 | 湖南科技大学 | Air source heat pump high-temperature water heating system suitable for low-temperature environment |
| CN205655522U (en) * | 2016-03-23 | 2016-10-19 | 上海海洋大学 | Tuna clipper waste heat recovery sprays formula from overlapping refrigerating plant |
| CN211526764U (en) * | 2019-12-16 | 2020-09-18 | 浙江工业大学 | Frostless air source cascade heat pump for solution icing |
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| KR101206794B1 (en) * | 2012-10-18 | 2012-11-30 | (주) 액트 | Heat Pump System With 2- Stage cascade Refrigeration Cycle |
| CN104214984A (en) * | 2014-09-12 | 2014-12-17 | 河南科技大学 | Auto-cascade energy tower heat pump system |
| CN205655522U (en) * | 2016-03-23 | 2016-10-19 | 上海海洋大学 | Tuna clipper waste heat recovery sprays formula from overlapping refrigerating plant |
| CN105928200A (en) * | 2016-04-28 | 2016-09-07 | 湖南科技大学 | Air source heat pump high-temperature water heating system suitable for low-temperature environment |
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