CN110500688B - Dilution type refrigeration heat pump system for air conditioning by utilizing dilution heat - Google Patents
Dilution type refrigeration heat pump system for air conditioning by utilizing dilution heat Download PDFInfo
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- CN110500688B CN110500688B CN201910902387.2A CN201910902387A CN110500688B CN 110500688 B CN110500688 B CN 110500688B CN 201910902387 A CN201910902387 A CN 201910902387A CN 110500688 B CN110500688 B CN 110500688B
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- 238000005057 refrigeration Methods 0.000 title claims abstract description 46
- 238000010790 dilution Methods 0.000 title claims abstract description 25
- 239000012895 dilution Substances 0.000 title claims abstract description 25
- 238000004378 air conditioning Methods 0.000 title claims abstract description 9
- 239000000243 solution Substances 0.000 claims abstract description 162
- 239000007788 liquid Substances 0.000 claims abstract description 129
- 239000011259 mixed solution Substances 0.000 claims abstract description 22
- 238000002156 mixing Methods 0.000 claims abstract description 14
- 238000000926 separation method Methods 0.000 claims abstract description 9
- 239000003085 diluting agent Substances 0.000 claims description 27
- 229910001868 water Inorganic materials 0.000 claims description 15
- 238000010438 heat treatment Methods 0.000 claims description 13
- 238000000034 method Methods 0.000 claims description 13
- 239000000126 substance Substances 0.000 claims description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 13
- 230000008569 process Effects 0.000 claims description 12
- 230000009977 dual effect Effects 0.000 claims description 11
- 238000001816 cooling Methods 0.000 claims description 10
- 238000009835 boiling Methods 0.000 claims description 4
- 239000012530 fluid Substances 0.000 claims description 4
- 230000009471 action Effects 0.000 claims description 3
- 238000009833 condensation Methods 0.000 claims description 3
- 230000005494 condensation Effects 0.000 claims description 3
- 238000003795 desorption Methods 0.000 claims description 3
- 239000006193 liquid solution Substances 0.000 claims description 3
- 238000004064 recycling Methods 0.000 claims description 3
- 239000007789 gas Substances 0.000 abstract description 20
- 230000000694 effects Effects 0.000 abstract description 6
- 238000005265 energy consumption Methods 0.000 abstract description 5
- 239000002440 industrial waste Substances 0.000 abstract description 2
- 238000010521 absorption reaction Methods 0.000 description 19
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 10
- 239000006096 absorbing agent Substances 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 229910021529 ammonia Inorganic materials 0.000 description 3
- 230000008859 change Effects 0.000 description 3
- 239000003507 refrigerant Substances 0.000 description 3
- NLXLAEXVIDQMFP-UHFFFAOYSA-N Ammonium chloride Substances [NH4+].[Cl-] NLXLAEXVIDQMFP-UHFFFAOYSA-N 0.000 description 2
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 description 2
- 235000011114 ammonium hydroxide Nutrition 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000004146 energy storage Methods 0.000 description 2
- AMXOYNBUYSYVKV-UHFFFAOYSA-M lithium bromide Chemical compound [Li+].[Br-] AMXOYNBUYSYVKV-UHFFFAOYSA-M 0.000 description 2
- 229910000975 Carbon steel Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005587 bubbling Effects 0.000 description 1
- 239000010962 carbon steel Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910000069 nitrogen hydride Inorganic materials 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 239000002918 waste heat Substances 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
- F24F13/30—Arrangement or mounting of heat-exchangers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F5/00—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater
- F24F5/0007—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater cooling apparatus specially adapted for use in air-conditioning
- F24F5/0014—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater cooling apparatus specially adapted for use in air-conditioning using absorption or desorption
-
- 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
- F25B30/04—Heat pumps of the sorption type
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Sorption Type Refrigeration Machines (AREA)
Abstract
The invention discloses a dilution refrigeration heat pump system for air conditioning by utilizing dilution heat, which comprises an evaporator, a lean liquid pump, a lean and rich liquid generator, a dual-quality condenser and a lean and rich liquid energy-saving heat exchanger, wherein a large amount of heat is absorbed by mixing two solutions, so that the aim of refrigeration is fulfilled; the mixed liquid is conveyed to a lean-rich liquid energy-saving heat exchanger by a lean liquid pump, and is heated for the first time, and then enters a lean-rich liquid generator for the second time; the saturation temperature of the two solutions is different to generate gas-liquid separation, the high-temperature gas which is vaporized after separation and the high-temperature solution which is not vaporized are transported to a double-quality condenser through different pipelines, the high-temperature gas and the high-temperature solution are radiated through an outdoor axial flow fan, the high-temperature gas is condensed into liquid, and the mixed solution is separated after the high-temperature solution is cooled. The invention adopts normal pressure refrigeration, the system is simple, convenient and easy to control, the novel environment-friendly working medium has no pollution gas emission and low energy consumption, can utilize heat such as solar energy or industrial waste heat, and has obvious energy-saving effect.
Description
Technical Field
The invention relates to a solution mixing heat absorption, thereby achieving a refrigeration effect, and then a device for leading a lean solution to change in phase state is needed to be designed, so that the solution separation is realized, and the circulation process is realized.
Background
Under the background of the current energy shortage and environmental crisis, how to reduce the energy consumption, the development of novel energy is increasingly valued by governments and related researchers in various countries, and has important research significance and practical value. Traditional compression refrigeration is gradually replaced by absorption refrigeration, such as LiBr/H2O absorption refrigerator, NH3/H20 absorption refrigerator and the like, and the compression refrigeration is widely applied in the fields of industrial production and national life; however, the absorption type refrigeration technology has a wide prospect for the novel refrigeration technology because the absorption type refrigeration technology has a plurality of problems that a large amount of waste heat cannot be utilized due to the limitation of absorption type working media and cycle characteristics and the insufficient refrigeration temperature.
Through the search of the prior art documents, the refrigeration system similar to the system is not found at present, the system which is close to or has the same point is an absorption refrigeration system, and the absorption refrigeration system has various forms and has respective advantages and disadvantages. For example, in the patent document of chinese publication No. CN108679873a, a novel ammonia absorption refrigeration system and method are disclosed, in which an added subcooler cools liquid ammonia by using gas ammonia from an evaporator, so that the system efficiency is improved, the reliability of the system is improved, and the energy in the process of depressurizing a dilute solution is recovered by using an ejector, so that the absorption pressure of the absorber is improved, the refrigeration coefficient of the system is improved under the condition that the cooling water temperature and the heat source temperature are the same as those of a conventional ammonia absorption refrigeration system, and the ammonia gas and the dilute ammonia solution are fully mixed in the ejector, so that the absorber is simplified into a simple absorption cooler without adopting a conventional bubbling structure.
Patent document CN108645073a discloses a solar energy-powered absorption refrigeration system, which comprises a solar energy-powered device, a refrigeration device, a controller and a pressure tank; the solar energy supply device comprises a solar heat collection device and a phase change energy storage box, wherein the solar heat collection device comprises an asymmetric composite plane condenser, an absorber and a bracket; the refrigerating device comprises an absorber, a steam generator, a condenser and an evaporator; the controller automatically controls the whole system to work according to a preset program. The invention aims to provide a high-efficiency, clean and energy-saving solar heat collection system which is used as a main heat source, is electrically heated to assist in energy supply, adopts a phase-change energy storage box, improves the heat energy utilization rate of the heat collection system, and provides a stable heat source for a refrigerating system.
In summary, the problems of the conventional absorption refrigeration exist; under the condition that the machine set is provided with air, the ammonia solution has stronger corrosiveness to the ordinary carbon steel. This affects not only the life of the unit, but also the performance and normal operation of the unit. In addition, the refrigerator operates under vacuum, and air is easily leaked in. Practice has shown that even a small amount of air leaks in, the performance of the unit is seriously impaired. For this reason, refrigerators require a tight seal, which adds difficulty to the manufacture and use of the unit. The evaporative type controls the refrigeration capacity by means of the flow of vaporized refrigerant, while the system of the present invention controls the refrigeration capacity by means of the flow of incoming rich liquid and diluent. The liquid flow is easier to control than the gas flow.
Disclosure of Invention
Aiming at the prior art, the invention provides a dilution type refrigeration heat pump system for air conditioning by utilizing dilution heat, which aims to overcome the defect that the traditional air conditioner needs to do work through a compressor to consume energy, and is particularly important how to reduce the energy consumption at present of rapid development of technology. In addition, the air conditioner widely applied at present needs a high-pressure environment to realize the refrigerating effect, and the invention only needs the mixing and heat absorption of the solution to generate cold energy, so that the high-pressure environment is not needed, and then the circulation can be completed only by separating the two mixed solutions again. Therefore, the energy consumption is reduced, the safety of the system is improved, and the system can be widely popularized in families.
In order to solve the technical problems, the dilution refrigeration heat pump system for air conditioning by utilizing dilution heat comprises an evaporator, a lean liquid pump, a lean-rich liquid generator, a dual-quality condenser and a lean-rich liquid energy-saving heat exchanger, wherein the evaporator is used for mixing two solutions so as to absorb a large amount of heat, exchange heat with external chilled water and generate cold energy; the mixed liquid is conveyed to a lean-rich liquid energy-saving heat exchanger by a lean liquid pump, is subjected to primary heating, then enters a lean-rich liquid generator, is subjected to secondary heating, and continuously absorbs heat; the saturated temperature of the two solutions is different to separate gas from liquid, the separated high-temperature gas which is vaporized and the high-temperature solution which is not vaporized are transported to the double-quality condenser through different pipelines, the heat of the high-temperature gas and the high-temperature solution is dissipated through the combined action of the air cold flow from the outdoor machine shaft flow fan, the cold flow generated by the heat exchange of the lean-rich liquid energy-saving heat exchanger and the mixed liquid from the evaporator, the high-temperature gas is condensed into liquid, the high-temperature solution realizes cooling, after the cooling is finished, the two liquids respectively enter the diluent pipeline throttle valve and the rich liquid pipeline throttle valve to be throttled and depressurized, and the depressurized solution enters the evaporator again to be mixed and absorbed, so that the circulation process is finished.
In the dilution refrigeration heat pump system for air conditioning by utilizing dilution heat, the lean and rich liquid generator comprises a low-temperature side inlet and two high-temperature side outlets, the dual-quality condenser comprises two high-temperature side inlets and two low-temperature side outlets, and the lean and rich liquid energy-saving heat exchanger comprises a low-temperature side inlet and a water outlet; the dual-quality condenser and the lean-rich liquid energy-saving heat exchanger are arranged in parallel in a shell; the dilution type refrigeration heat pump system also comprises two three-way steering valves, which are respectively marked as a first three-way steering valve and a second three-way steering valve, wherein the first three-way steering valve is provided with an inlet and two outlets a and b, the second three-way steering valve is provided with 2 inlets c and d and an outlet, the outlet of the evaporator is connected to the inlet of the lean solution pump, and the outlet of the lean solution pump is connected to the inlet of the first three-way steering valve; the outlet a of the first three-way steering valve is connected to the low-temperature side inlet of the lean-rich liquid energy-saving heat exchanger, the water outlet of the lean-rich liquid energy-saving heat exchanger is connected to the inlet c of the second three-way steering valve and is connected to the low-temperature side inlet of the lean-rich liquid generator through the outlet of the second three-way steering valve, and the outlet b of the first three-way steering valve is connected to the inlet d of the second three-way steering valve and is connected to the low-temperature side inlet of the lean-rich liquid generator through the outlet of the second three-way steering valve; the two high temperature side outlets of the lean and rich liquid generator are respectively connected to the two high temperature side inlets of the dual condenser through a high Wen Fuye pipe and a high temperature diluent pipe; the two low-temperature side outlets of the dual-quality condenser are respectively throttled by a diluent pipeline throttle valve and a rich liquid pipeline throttle valve and then are connected to the inlet of the evaporator through the respective low-pressure outlets.
According to the invention, the boiling points of the two solutions in the evaporator are different, the solutions are discharged through the lean solution pump after being mixed, when the outlet a of the first three-way steering valve is communicated with the inlet c of the second three-way steering valve, the lean solution is transported into the lean-rich solution energy-saving heat exchanger, and the solution subjected to heat exchange and temperature rise enters the lean-rich solution generator through the second three-way steering valve for secondary temperature rise; when the outlet b of the first three-way steering valve is communicated with the inlet d of the second three-way steering valve, the lean solution is directly transported into a lean-rich solution generator for heating; the lean-rich liquid generator changes one solution into steam by absorbing heat added from the outside, the other solution is kept in a liquid state, two phase substances are separated and are respectively transported into two pipelines in the dual-quality condenser through two high-temperature side outlets and a high-temperature Wen Fuye pipe and a high-temperature diluent pipe, the substances in the two pipelines exchange heat with the outside and are cooled, the respective enthalpy values are reduced, the substances in the two pipelines are condensed into liquid, and the pressure of the liquid is slightly higher than the pressure in the evaporator; the two solutions cooled in the double-mass condenser simultaneously pass through the lean-rich liquid energy-saving heat exchanger, and the heat of the two solutions exchanges heat with the low-temperature fluid from the evaporator, so that the diluent solution and the rich liquid solution which pass through the lean-rich liquid energy-saving heat exchanger are further cooled, and meanwhile, the lean liquid is heated once; the pressure of the two solutions is reduced through throttling, so that the flow of the solutions is more stable, the two solutions entering the evaporator are mixed again, a large amount of heat is absorbed in the mixing process, and the temperature of the surrounding environment is reduced.
In the invention, the evaporator mixes the two low-pressure solutions from the diluent pipeline throttle valve and the rich liquid pipeline throttle valve, the heat absorbed after mixing reduces the temperature of the environment so as to achieve the aim of refrigeration, and then the mixed solution is conveyed to the lean-rich liquid generator by the lean liquid pump for desorption and then returned to the evaporator for recycling.
According to the invention, the lean-rich liquid generator separates two phase matters according to the difference of saturation temperatures of two solutions by absorbing heat, and the separated two phase matters are respectively conveyed to the double-mass condenser for condensation through different pipelines.
In the invention, the lean-rich liquid energy-saving heat exchanger enables the condensed solution to be cooled for the second time, and heat is transferred to the lean liquid completely mixed by the evaporator, so that the temperature of the lean liquid is increased while the temperature of condensed water is reduced, and the heat efficiency of circulation is improved.
Compared with the prior art, the invention has the beneficial effects that:
(1) The invention is a system for refrigerating by utilizing the solution dilution heat, so that the refrigeration can be realized without the need of a high-pressure environment like a traditional air conditioner.
(2) In the prior art, the compressor is required to dissipate energy, the volume of the air conditioner is generally larger, noise is often generated in the running process, and the dilution heat refrigeration of the solution is adopted to replace the traditional refrigerant evaporation refrigeration, so that the equipment structure is simplified, the system is more compact, and better popularization can be achieved; the whole circulation is carried out under normal pressure, so the operation is safer.
Drawings
Fig. 1 is a schematic diagram of the principle and structure of a dilution refrigeration heat pump system for air conditioning by dilution heat according to the present invention.
In the figure:
the device comprises a 1-evaporator, a 2-lean solution pump, a 31-first three-way steering valve, a 32-second three-way steering valve, a 4-lean-rich solution generator, a 5-dual condenser, a 6-lean-rich solution energy-saving heat exchanger, a 7-diluent pipeline throttle valve and an 8-rich solution pipeline throttle valve.
Detailed Description
The invention will now be further described with reference to the accompanying drawings and specific examples, which are in no way limiting.
As shown in fig. 1, the dilution refrigeration heat pump system for air conditioning by utilizing dilution heat provided by the invention comprises an evaporator 1, a lean solution pump 2, a lean solution and rich solution generator 4, a dual-quality condenser 5 and a lean and rich solution energy-saving heat exchanger 6, wherein the evaporator 1 is used for mixing two solutions so as to absorb a large amount of heat, exchange heat with external chilled water and generate cold energy; the mixed liquid is conveyed to a lean-rich liquid energy-saving heat exchanger 6 by a lean liquid pump to be heated for the first time, then enters a lean-rich liquid generator 4 to be heated for the second time, and heat is continuously absorbed; because the saturation temperatures of the two solutions are different, gas-liquid separation is generated, the separated high-temperature gas which is vaporized and the high-temperature solution which is not vaporized are transported to the double-mass condenser 5 through different pipelines, the heat of the high-temperature gas and the high-temperature solution is dissipated through the combined action of the cold air flow from an outdoor shaft flow fan and the cold flow generated by the heat exchange of the lean-rich liquid energy-saving heat exchanger 6 and the mixed liquid from the evaporator 1, the high-temperature gas is condensed into liquid, the high-temperature solution realizes cooling, after the cooling is finished, the two liquids respectively enter a diluent pipeline throttle valve and a rich liquid pipeline throttle valve for throttling and depressurization, and the depressurized solution enters the evaporator 1 again for continuous mixing and heat absorption, thus the circulation process is finished.
The two solutions (with different boiling points) are mixed in the evaporator 1, a great amount of heat is absorbed, the temperature of the environment can be reduced, the mixed solution is sent to the lean-rich solution energy-saving heat exchanger 6 by the lean solution pump 2, the lean solution pump 2 is also the power of system circulation, the temperature of the mixed solution is increased after passing through the lean-rich solution energy-saving heat exchanger 6, a part of heat is provided for separating the mixed solution, the mixed solution is then fed into the lean-rich solution generator 4 for further absorbing the heat, one solution is subjected to phase change and overflows in the solution at first due to different saturation temperatures of the two solutions, the mixed solution starts to be separated, the two solutions become high-temperature solution and gas, most of the heat in the dual condenser 5 is dissipated into the environment to finish the first cooling, and meanwhile, the two solutions which are reduced to a sufficient temperature are respectively cooled after the mixed solution which is transmitted to the mixed solution from the evaporator 1 is exchanged through the lean-rich solution energy-saving heat exchanger 6 and then flow into the evaporator 1 through the cold flow into the diluent pipeline throttle valve 7 and the rich solution pipeline throttle valve 8 for reducing the pressure.
In the dilution refrigeration heat pump system of the invention, the lean and rich liquid generator 4 comprises a low-temperature side inlet and two high-temperature side outlets, the dual condenser 5 comprises two high-temperature side inlets and two low-temperature side outlets, and the lean and rich liquid energy-saving heat exchanger 6 comprises a low-temperature side inlet and a water outlet; the double-mass condenser 5 and the lean-rich liquid economizer heat exchanger 6 are arranged in parallel in one housing, and the stroke of the double-mass condenser 5 and the lean-rich liquid economizer heat exchanger 6 is not limited in the invention, so long as the double-mass condenser 5 and the lean-rich liquid economizer heat exchanger 6 are overlapped in parallel. In the invention, the device also comprises two three-way reversing valves which are arranged among the lean solution pump 2, the lean solution-rich solution energy-saving heat exchanger 6 and the lean solution generator 4 and are respectively marked as a first three-way reversing valve and a second three-way reversing valve, wherein the first three-way reversing valve is provided with an inlet and two outlets a and b, the second three-way reversing valve is provided with 2 inlets c and d and an outlet, the outlet of the evaporator is connected to the inlet of the lean solution pump, and the outlet of the lean solution pump is connected to the inlet of the first three-way reversing valve; the outlet a of the first three-way steering valve is connected to the low-temperature side inlet of the lean-rich liquid energy-saving heat exchanger, the water outlet of the lean-rich liquid energy-saving heat exchanger is connected to the inlet c of the second three-way steering valve and is connected to the low-temperature side inlet of the lean-rich liquid generator through the outlet of the second three-way steering valve, and the outlet b of the first three-way steering valve is connected to the inlet d of the second three-way steering valve and is connected to the low-temperature side inlet of the lean-rich liquid generator through the outlet of the second three-way steering valve; the two high temperature side outlets of the lean and rich liquid generator 4 are respectively connected to the two high temperature side inlets of the dual condenser 5 through a high Wen Fuye pipe and a high temperature diluent pipe; the two low-temperature side outlets of the dual condenser 5 are respectively throttled by a diluent pipeline throttle valve 7 and a rich liquid pipeline throttle valve 8 and then connected to the inlet of the evaporator 1 through the respective low-pressure outlets.
The solution in the evaporator 1 is discharged through the lean solution pump 2 after being mixed, when the outlet a of the first three-way steering valve 31 and the inlet c of the second three-way steering valve 32 are communicated, the lean solution is transported into the lean-rich solution energy-saving heat exchanger 6, the lean solution pump 2 conveys the mixed solution fully mixed in the evaporator 1 into the lean-rich solution energy-saving heat exchanger 6 for primary heating, the solution after heat exchange and temperature rise enters the lean-rich solution generator 4 through the water outlet of the lean-rich solution energy-saving heat exchanger 6, the temperature of the lean-rich solution generator 4 is increased through the heat from the heater, and the mixed solution is subjected to secondary heating at the moment to realize secondary temperature rise; when the outlet b of the first three-way steering valve 31 and the inlet d of the second three-way steering valve 32 are communicated, the lean solution is directly transported into the lean-rich solution generator 4 for heating; the lean-rich solution generator 4 absorbs heat added from the outside, the mixed solution from the lean-rich solution energy-saving heat exchanger 6 is transported into two pipelines in the dual condenser 5 through a high Wen Fuye pipe and a high-temperature diluent pipe under the high-temperature environment in the lean-rich solution generator 4, the heat is absorbed by the lean-rich solution generator 4, one solution is vaporized to be steam according to the difference of the saturation temperatures of the two solutions, the other high-temperature solution which is not vaporized is kept in a liquid state, so that substances in two phases are separated, namely high-temperature liquid and gas are respectively discharged from two high-temperature side outlets of the lean-rich solution generator 4, the substances in the two pipelines are subjected to heat exchange with the outside through a high Wen Fuye pipe and a high-temperature diluent pipe, the heat is lost through an outdoor shaft flow fan, the respective enthalpy value is reduced, the high-temperature gas is condensed into the liquid, and the other solution can be cooled; at this time, the pressure of the liquid is slightly higher than the pressure in the evaporator 1; the two solutions cooled in the dual condenser 5 pass through the lean-rich liquid energy-saving heat exchanger 6, the heat of the two solutions exchanges heat with the low-temperature fluid from the evaporator 1, the lean-rich liquid energy-saving heat exchanger 6 is a shell type heat exchanger, the diluent solution and the rich liquid solution passing through the lean-rich liquid energy-saving heat exchanger 6 are further cooled, the lean-rich liquid energy-saving heat exchanger 6 enables the solution which is cooled once after condensation to be cooled twice, the heat is transferred to the lean liquid which is completely mixed by the evaporator 1, and the temperature of condensed water is reduced while the lean liquid is heated once, so that the heat efficiency of circulation is improved. And then the two cooled liquids are throttled and depressurized respectively from the pipeline and through a diluent pipeline throttle valve 7 and a rich liquid pipeline throttle valve 8, the high-pressure ends of the diluent pipeline throttle valve 7 and the rich liquid pipeline throttle valve 8 are connected at the outlet, the throttle valve throttles and depressurizes the two solutions through a valve with a throttle section or a throttle length controlled by fluid flow, the pressure after being reduced is equal to the pressure required by the lean rich liquid generator 4, the pressure of the two solutions is reduced through throttling, the flowing of the solutions is more stable, the depressurized solutions enter the evaporator 1 again to continuously mix and absorb heat, the mixing process absorbs a large amount of heat, the temperature of the surrounding environment is reduced, the aim of refrigeration is achieved, and then the mixed solution is conveyed to the lean rich liquid generator 4 by the lean liquid pump 2 for desorption and then returned to the evaporator 1 for recycling.
The invention utilizes the mixed heat absorption of two solutions to achieve the refrigerating effect, wherein the evaporator 1 is a device for absorbing heat of the mixed solutions and sends cold to the room through the refrigerating medium.
The lean and rich solution generator 4 separates two phase substances according to the saturation temperature of the mixed solution with complete heat absorption, and the two phase substances are transported to the double-quality condenser 5 through two different pipelines.
The dual condenser 5 is used for cooling the solution and the gas, and transferring a part of heat to the environment, so that the enthalpy value in the system is reduced, the temperature of the mixed solution from the evaporator 1 can be increased by the dual condenser and the solution fed into the lean-rich solution energy-saving heat exchanger 6, and meanwhile, the two solutions are further reduced to a proper temperature, so that the situation that the solution reaching the evaporator 1 cannot be sufficiently cooled is avoided, and the refrigerating effect cannot be realized.
The diluent pipeline throttle valve 7 and the rich liquid pipeline throttle valve 8 reduce the pressure from the lean rich liquid energy-saving heat exchanger 6 and control the flow of the two solutions flowing into the evaporator 1; the evaporator 1 mixes the two low-pressure solutions from the diluent pipeline throttle valve 7 and the rich liquid pipeline throttle valve 8, absorbs heat to reduce the temperature of the environment, and then the mixed solution is pumped out by the lean liquid pump 2.
The two circulation processes realized by the present invention will be described below, wherein the cooling cycle in summer is completed when the outlet a of the first three-way steering valve 31 and the inlet c of the second three-way steering valve 32 are turned on, and the heating cycle in winter is completed when the outlet b of the first three-way steering valve 31 and the inlet d of the second three-way steering valve 32 are turned on.
A summer refrigeration cycle; firstly, two solutions are mixed in an evaporator 1 to absorb heat, exchange heat with a secondary refrigerant, refrigeration is completed, a switch is positioned at an end a (an outlet a of a first three-way steering valve 31 and an inlet c of a second three-way steering valve 32 are in a conducting state), then the mixed solution is conveyed to a lean-rich liquid energy-saving heat exchanger 6 by a lean liquid pump 2, primary heating is carried out, the mixed solution enters a lean-rich liquid generator 4 after completion of primary heating, secondary heating is carried out, heat is continuously absorbed, gas-liquid separation is generated due to different boiling points of the two solutions, the two solutions flow to a condenser through different pipelines after separation, the respective heat is dissipated to the outside and is cooled, the primary cooling is completed, the cooled two solutions continue to exchange heat with mixed liquid from the evaporator through the lean-rich liquid energy-saving heat exchanger 6, the secondary cooling is completed, the cooled solutions enter a diluent pipeline throttle valve 7 and a rich liquid pipeline throttle valve 8, and the throttle valve is used for throttling and depressurizing the two solutions, and the pressure after the lowering is equal to the pressure required by the generator. The depressurized solution is continuously mixed and absorbed in the generator to complete the circulation process.
Heating cycle in winter; firstly, two solutions are completely mixed in an evaporator 1, a switch is positioned at a b end (an outlet b of a first three-way steering valve 31 and an inlet d of a second three-way steering valve 32 are in a conducting state), the two solutions enter a lean-rich liquid generator 4 through a lean liquid pump 2, heat is absorbed in the generator, gas-liquid separation is generated due to different saturation temperatures of the two solutions, the two solutions enter a condenser through different pipelines after being separated, and indoor cold air exchanges heat with the solution and the gas in the condenser to heat the indoor air, so that heating is completed. And the mixed solution enters a diluent pipeline throttle valve 7 and a rich liquid pipeline throttle valve 8, the throttle valve throttles and reduces the pressure of the two solutions, and the reduced pressure is equal to the pressure required by the generator. The depressurized solution is continuously mixed and absorbed in the generator to complete the circulation process.
The invention overcomes the defect that the existing refrigeration system needs high-pressure gas, can complete refrigeration cycle by adopting normal pressure, can complete refrigeration by only mixing solutions, is greatly simple, convenient and easy to control, runs at low pressure, is safe, is novel and environment-friendly, has no pollution gas emission, has low energy consumption, can utilize heat such as solar energy or industrial waste heat, and has obvious energy-saving effect.
Although the invention has been described above with reference to the accompanying drawings, the invention is not limited to the above-described embodiments, which are merely illustrative and not restrictive, and many modifications may be made by those of ordinary skill in the art without departing from the spirit of the invention, which fall within the protection of the invention.
Claims (3)
1. The dilution type refrigeration heat pump system for air conditioning by utilizing dilution heat is characterized by comprising an evaporator (1), a lean solution pump (2), a lean solution generator (4), a double-quality condenser (5) and a lean solution energy-saving heat exchanger (6), wherein the evaporator (1) is used for mixing two solutions so as to absorb a large amount of heat and exchange heat with external chilled water to generate cold energy; the mixed liquid is conveyed to a lean-rich liquid energy-saving heat exchanger (6) by a lean liquid pump (2), is heated for the first time, then enters a lean-rich liquid generator (4), is heated for the second time, and continuously absorbs heat; because the saturation temperatures of the two solutions are different, gas-liquid separation is generated, high-temperature gas which is vaporized after separation and high-temperature solution which is not vaporized are transported to the double-quality condenser (5) through different pipelines, the heat of the high-temperature gas and the high-temperature solution is dissipated through the combined action of air cold flow from an outdoor machine shaft flow fan and cold flow generated by heat exchange of a lean-rich liquid energy-saving heat exchanger (6) and mixed liquid from the evaporator (1), the high-temperature gas and the high-temperature solution are condensed into liquid, the high-temperature solution is cooled, after the cooling is finished, the two liquids respectively enter a diluent pipeline throttle valve and a rich liquid pipeline throttle valve to be throttled and depressurized, the depressurized solution enters the evaporator (1) again to continue mixing and absorbing heat, and the circulation process is completed;
the lean and rich liquid generator (4) comprises a low-temperature side inlet and two high-temperature side outlets, the dual condenser (5) comprises two high-temperature side inlets and two low-temperature side outlets, and the lean and rich liquid energy-saving heat exchanger (6) comprises a low-temperature side inlet and a water outlet; the double-mass condenser (5) and the lean-rich liquid energy-saving heat exchanger (6) are arranged in parallel in a shell;
the dilution type refrigeration heat pump system further comprises two three-way steering valves, namely a first three-way steering valve (31) and a second three-way steering valve (32), wherein the first three-way steering valve (31) is provided with an inlet and two outlets a and b, the second three-way steering valve (32) is provided with 2 inlets c and d and an outlet, the outlet of the evaporator (1) is connected to the inlet of the lean solution pump (2), and the outlet of the lean solution pump (2) is connected to the inlet of the first three-way steering valve (31); the outlet a of the first three-way steering valve (31) is connected to the low-temperature side inlet of the lean-rich liquid energy-saving heat exchanger (6), the water outlet of the lean-rich liquid energy-saving heat exchanger (6) is connected to the inlet c of the second three-way steering valve (32) and is connected to the low-temperature side inlet of the lean-rich liquid generator (4) through the outlet of the two three-way steering valve (32), and the outlet b of the first three-way steering valve (31) is connected to the inlet d of the second three-way steering valve (32) and is connected to the low-temperature side inlet of the lean-rich liquid generator (4) through the outlet of the second three-way steering valve (32); the two high temperature side outlets of the lean and rich liquid generator (4) are respectively connected to the two high temperature side inlets of the dual condenser (5) through a high Wen Fuye pipe and a high temperature diluent pipe; two low-temperature side outlets of the double-mass condenser (5) are respectively throttled by a diluent pipeline throttle valve (7) and a rich liquid pipeline throttle valve (8) and then connected to an inlet of the evaporator (1) through respective low-pressure outlets;
the boiling points of the two solutions in the evaporator (1) are different, the solutions are discharged through a lean solution pump (2) after being mixed, when the outlet a of the first three-way steering valve (31) is communicated with the inlet c of the second three-way steering valve (32), the lean solution is transported into the lean-rich solution energy-saving heat exchanger (6), the solution subjected to heat exchange and temperature rise enters the lean-rich solution generator (4) through the outlet of the second three-way steering valve (32) for secondary temperature rise; when the outlet b of the first three-way steering valve (31) is communicated with the inlet d of the second three-way steering valve (32), the lean solution is directly transported into the lean-rich solution generator (4) for heating; the lean-rich liquid generator (4) changes one solution into steam by absorbing heat added from the outside, the other solution is kept in a liquid state, two phase substances are separated and are respectively transported into two pipelines in the dual-quality condenser (5) through two high-temperature side outlets and a high-temperature Wen Fuye pipe and a high-temperature diluent pipe, the substances in the two pipelines exchange heat with the outside and cool, the enthalpy value of each of the substances is reduced, the substances in the two pipelines are condensed into liquid, and the pressure of the liquid is slightly higher than the pressure in the evaporator (1); the two solutions cooled in the double-quality condenser (5) pass through the lean-rich liquid energy-saving heat exchanger (6), heat of the two solutions exchanges heat with low-temperature fluid from the evaporator (1), so that the diluent solution and the rich liquid solution which pass through the lean-rich liquid energy-saving heat exchanger (6) are further cooled, and meanwhile, the lean liquid is heated for one time; the pressure of the two solutions is reduced through throttling, so that the flow of the solutions is more stable, the two solutions entering the evaporator (1) are mixed again, a large amount of heat is absorbed in the mixing process, and the temperature of the surrounding environment is reduced;
the evaporator (1) mixes two low-pressure solutions from the diluent pipeline throttle valve (7) and the rich liquid pipeline throttle valve (8), the heat absorbed after mixing reduces the temperature of the environment so as to achieve the aim of refrigeration, and then the mixed solution is conveyed to the lean liquid generator (4) by the lean liquid pump (2) for desorption and then returned to the evaporator (1) for recycling.
2. The dilution refrigeration heat pump system according to claim 1, wherein the lean-rich liquid generator (4) separates two phase substances according to the saturation temperature of two solutions by absorbing heat, and the separated two phase substances are respectively conveyed to the double-mass condenser (5) for condensation through different pipelines.
3. The dilution refrigeration heat pump system according to claim 1, wherein the lean-rich solution economizer heat exchanger (6) reduces the temperature of the condensed solution for the second time, transfers heat to the lean solution completely mixed by the evaporator (1), increases the temperature of the lean solution while reducing the temperature of the condensed water, and increases the heat efficiency of the cycle.
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