CN109425140B - Refrigeration circuit and refrigeration plant based on non-azeotropic mixed working medium - Google Patents
Refrigeration circuit and refrigeration plant based on non-azeotropic mixed working medium Download PDFInfo
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- CN109425140B CN109425140B CN201710779117.8A CN201710779117A CN109425140B CN 109425140 B CN109425140 B CN 109425140B CN 201710779117 A CN201710779117 A CN 201710779117A CN 109425140 B CN109425140 B CN 109425140B
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- 238000005057 refrigeration Methods 0.000 title claims abstract description 23
- 239000007788 liquid Substances 0.000 claims abstract description 60
- 239000003507 refrigerant Substances 0.000 claims description 57
- 239000012530 fluid Substances 0.000 claims description 21
- 229920006395 saturated elastomer Polymers 0.000 claims description 16
- 238000009833 condensation Methods 0.000 claims description 7
- 230000005494 condensation Effects 0.000 claims description 7
- 239000000203 mixture Substances 0.000 claims description 5
- 239000000126 substance Substances 0.000 claims description 2
- 238000005265 energy consumption Methods 0.000 abstract description 6
- 238000000926 separation method Methods 0.000 description 9
- 238000001704 evaporation Methods 0.000 description 7
- 230000008020 evaporation Effects 0.000 description 7
- 238000000034 method Methods 0.000 description 7
- 238000009835 boiling Methods 0.000 description 4
- 239000012071 phase Substances 0.000 description 4
- 239000007791 liquid phase Substances 0.000 description 3
- 230000000295 complement effect Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000002427 irreversible effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 239000011555 saturated liquid Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000004781 supercooling Methods 0.000 description 1
Images
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
- F25B6/00—Compression machines, plants or systems, with several condenser circuits
- F25B6/02—Compression machines, plants or systems, with several condenser circuits arranged in parallel
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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
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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
-
- 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
- F25B2400/00—General features or devices for refrigeration machines, plants or systems, combined heating and refrigeration systems or heat-pump systems, i.e. not limited to a particular subgroup of F25B
- F25B2400/07—Details of compressors or related parts
- F25B2400/075—Details of compressors or related parts with parallel compressors
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Compression-Type Refrigeration Machines With Reversible Cycles (AREA)
Abstract
The invention discloses a refrigerating circuit and refrigerating equipment based on a non-azeotropic mixed working medium. The refrigeration loop based on the non-azeotropic mixed working medium comprises a first compressor, a second compressor, a first condenser, a second condenser, a first subcooler, an evaporator, a gas-liquid separator, a first throttling device and a second throttling device; outlets of the first compressor and the second compressor are respectively connected with an inlet of a first condenser, the condensers are connected with inlets of gas-liquid separators, gas outlets of the gas-liquid separators are connected with inlets of second condensers, outlets of the second condensers are sequentially connected with a first throttling device through a first subcooler, the first throttling device is connected with an inlet of an evaporator, and an outlet of the evaporator is connected with an inlet of the first compressor; and a liquid outlet of the gas-liquid separator is connected with a second throttling device, and the second throttling device is connected with an inlet of the second compressor through the first subcooler. The energy consumption of a refrigerating circuit based on the non-azeotropic mixed working medium is reduced, and the energy efficiency is improved.
Description
Technical Field
The invention relates to a refrigerating system, in particular to a refrigerating circuit and refrigerating equipment based on a non-azeotropic mixed working medium.
Background
At present, a non-azeotropic mixed working medium is formed by mixing a plurality of pure substances with different boiling points, and has the characteristics of temperature slippage, component separation and the like in the evaporation and condensation processes. When the non-azeotropic mixed refrigerant is used as the refrigerant in the refrigerating loop, the temperature slippage exists in the condenser and the evaporator, the irreversible loss of the heat transfer of the condenser and the evaporator can be effectively reduced, the circulating efficiency is improved, and meanwhile, the non-azeotropic mixed refrigerant can realize the complementary effect of the advantages of all pure refrigerants, so the non-azeotropic mixed refrigerant is more and more widely applied in recent years. However, in the operation process of the refrigeration circuit in the prior art, the non-azeotropic mixed working medium is adopted, the temperature slip characteristic of the non-azeotropic mixed working medium can only be utilized, the component separation characteristic of the non-azeotropic mixed working medium cannot be effectively utilized, the advantages of the non-azeotropic mixed working medium cannot be fully utilized, and the energy consumption is high. The technical problem to be solved by the invention is how to design a refrigeration loop with low energy consumption to improve energy efficiency.
Disclosure of Invention
The invention provides a refrigerating circuit and a refrigerating device based on a non-azeotropic mixed working medium, which can reduce the energy consumption of the refrigerating circuit based on the non-azeotropic mixed working medium and improve the energy efficiency.
In order to achieve the technical purpose, the invention adopts the following technical scheme:
a refrigeration loop based on a non-azeotropic mixed working medium comprises a first compressor, a second compressor, a first condenser, a second condenser, a first subcooler, an evaporator, a gas-liquid separator, a first throttling device and a second throttling device; outlets of the first compressor and the second compressor are respectively connected with an inlet of the first condenser, the condenser is connected with an inlet of the gas-liquid separator, an air outlet of the gas-liquid separator is connected with an inlet of the second condenser, an outlet of the second condenser is connected with the first throttling device sequentially through the first subcooler, the first throttling device is connected with an inlet of the evaporator, and an outlet of the evaporator is connected with an inlet of the first compressor; and a liquid outlet of the gas-liquid separator is connected with a second throttling device, and the second throttling device is connected with an inlet of the second compressor through the first subcooler.
And the outlet of the evaporator is connected with the inlet of the first compressor through the second subcooler, and the liquid outlet of the gas-liquid separator is connected with the second throttling device through the second subcooler.
The liquid outlet of the gas-liquid separator is connected with the second subcooler through the third subcooler, and the first subcooler is connected with the inlet of the second compressor through the third subcooler.
Furthermore, the saturated refrigerant gas output from the gas outlet of the gas-liquid separator sequentially passes through the second condenser, the hot fluid side of the first subcooler, the first throttling device, the evaporator and the cold fluid side of the second subcooler and then enters the first compressor.
Furthermore, the saturated refrigerant liquid output by the liquid outlet of the gas-liquid separator sequentially passes through the hot fluid side of the third subcooler, the hot fluid side of the second subcooler, the second throttling device, the cold fluid side of the first subcooler and the cold fluid side of the third subcooler and then enters the second compressor.
The invention also provides refrigeration equipment which comprises the refrigeration loop based on the non-azeotropic mixed working medium.
Compared with the prior art, the invention has the advantages and positive effects that: the separation process of primary components is completed in the condensation process by utilizing the component separation characteristic of the azeotropic refrigerant in the evaporation and condensation processes, so that the refrigerant vapor which is separated from the gas-liquid separator and is rich in the low-boiling-point components enters the evaporator after passing through the further condenser, thereby achieving the purposes of improving the evaporation pressure of the system and further improving the performance of the system; meanwhile, the circuit adopts a mode of parallel operation of the double compressors, so that the throttling degree of two paths of fluid after component separation can be respectively adjusted according to the operation working condition, the throttling loss of the system is reduced to the maximum extent, the energy consumption of the refrigerating circuit based on the non-azeotropic mixed working medium is reduced, and the energy efficiency is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic diagram of an embodiment of a refrigeration circuit based on a zeotropic mixture of working fluids according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1, the refrigeration circuit based on the non-azeotropic mixed working medium in this embodiment is composed of a first compressor 101, a second compressor 102, a first condenser 103, a gas-liquid separator 104, a second condenser 105, a first subcooler 106, a first throttling device 107, an evaporator 108, a second subcooler 109, a third subcooler 110, a second throttling device 111, and the like. An outlet of the first compressor 101 and an outlet of the second compressor 102 are merged and then connected with an inlet of the first condenser 103, an outlet of the first condenser 103 is connected with an inlet of the gas-liquid separator 104, an air outlet of the gas-liquid separator 104 is connected with an inlet of the second condenser 105, an outlet of the second condenser 105 is connected with the first throttling device 107 sequentially through the first subcooler 106, the first throttling device 107 is connected with an inlet of the evaporator 108, and an outlet of the evaporator 108 is connected with an inlet of the first compressor 101; a liquid outlet of the gas-liquid separator 104 is connected to a second throttling device 111, and the second throttling device 111 is connected to an inlet of the second compressor 102 through the first subcooler 106.
Specifically, in the embodiment, refrigerants output by a first compressor 101 and a second compressor 102 of a refrigeration circuit based on a non-azeotropic mixed working medium are converged and enter a first condenser 103, the refrigerant is condensed by the first condenser 103 and then enters a gas-liquid separator 104, the gas-liquid separator 104 separates saturated refrigerant gas and saturated refrigerant liquid in the refrigerant, wherein the saturated refrigerant gas passes through a second condenser 105 again for further condenser and then enters an evaporator 108 through a first throttling device 107, so that the purpose of increasing the evaporation pressure of a system and further improving the performance of the system can be achieved; and the saturated refrigerant liquid is throttled by the second throttling device 111, exchanges heat by the first subcooler 106 and then enters the second compressor 102 to complete the cycle. Preferably, the refrigeration circuit based on the non-azeotropic mixed working medium in this embodiment further includes a second subcooler 109, an outlet of the evaporator 108 is connected to an inlet of the first compressor 101 through the second subcooler 109, a liquid outlet of the gas-liquid separator 104 is connected to the second throttling device 111 through the second subcooler 109, and heat exchange is performed through the second subcooler 109, so that the return air temperature of the first compressor can be more effectively increased, and the energy efficiency is improved. Furthermore, the refrigeration circuit based on the non-azeotropic mixed working medium in this embodiment further includes a third subcooler 110, the liquid outlet of the gas-liquid separator 104 is connected to the second subcooler 109 through the third subcooler 110, and the first subcooler 106 is connected to the inlet of the second compressor 102 through the third subcooler 110. Specifically, the outlet of the gas-liquid separator 104 is divided into two paths: one path of saturated refrigerant gas outlet is connected with the inlet of the second condenser 105, the outlet of the second condenser 105 is connected with the inlet of the first throttling device 107 through the hot fluid side of the first subcooler 106, the outlet of the first throttling device 107 is connected with the inlet of the evaporator 108, and the outlet of the evaporator 108 is connected with the inlet of the first compressor 101 through the cold fluid side of the second subcooler 109; the other path of saturated refrigerant liquid outlet is connected with the inlet of the second throttling device 111 sequentially through the hot fluid side of the third subcooler 110 and the hot fluid side of the second subcooler 109, and the outlet of the second throttling device 111 is connected with the inlet of the second compressor 102 sequentially through the cold fluid side of the first subcooler 106 and the cold fluid side of the third subcooler 110 to complete the circulation. By arranging the gas-liquid separator 104 between the first condenser 103 and the second condenser 105, the separation process of the primary components is completed in the condensation process, so that the refrigerant vapor which is separated from the gas-liquid separator 104 and is rich in the low-boiling-point components is further condensed and finally enters the evaporator 108, thereby achieving the purpose of improving the evaporation pressure of the system and further improving the performance of the system.
The subcooler has the overall functions of increasing the heat exchange quantity of the evaporator and improving the refrigeration efficiency of the refrigeration system; the first subcooler 106 is used for separating the mixed refrigerant by the gas-liquid separator 104, allowing the gas refrigerant rich in the low-boiling-point refrigerant to enter the condenser 105, and allowing the gas refrigerant to become a gas-liquid two-phase refrigerant rich in the low-boiling-point refrigerant by the condenser and then enter the first subcooler 106; the heat is further released in the first subcooler 106 to reach the state of saturated liquid or even subcooled liquid, and the refrigerating capacity of the evaporator 108 can be greatly improved after throttling by the throttle valve 107. The second subcooler 109 is used for separating the mixed refrigerant through the gas-liquid separator 104, and the liquid refrigerant rich in the high-boiling-point refrigerant enters the third subcooler 110 for further cooling and then enters the second subcooler 109; at this time, the supercooled refrigerant rich in the high-boiling-point refrigerant further exchanges heat with the low-boiling-point two-phase refrigerant rich in the high-boiling-point refrigerant from the evaporator 108, so that the supercooling degree of the high-boiling-point refrigerant is larger, and the refrigerating capacity of the sub-cycle evaporator is further increased. The third subcooler 110 is used for separating the high-temperature high-pressure saturated liquid-phase refrigerant rich in the high-boiling-point refrigerant from the gas-liquid separator 104 and then feeding the high-temperature high-pressure saturated liquid-phase refrigerant into the third subcooler 110; the low-temperature and low-pressure two-phase refrigerant rich in the high-boiling point refrigerant comes out of the first subcooler 106 and then enters the third subcooler 110, and heat exchange is performed in the third subcooler 110, so that the high-pressure liquid-phase refrigerant rich in the high-boiling point refrigerant entering the second subcooler 109 reaches a subcooled state, and the low-pressure gas-phase refrigerant rich in the high-boiling point refrigerant entering the compressor 102 reaches a superheated state.
The separation process of primary components is completed in the condensation process by utilizing the component separation characteristic of the azeotropic refrigerant in the evaporation and condensation processes, so that the refrigerant vapor which is separated from the gas-liquid separator and is rich in the low-boiling-point components enters the evaporator after passing through the further condenser, thereby achieving the purposes of improving the evaporation pressure of the system and further improving the performance of the system; meanwhile, the circuit adopts a mode of parallel operation of the double compressors, so that the throttling degree of two paths of fluid after component separation can be respectively adjusted according to the operation working condition, the throttling loss of the system is reduced to the maximum extent, the energy consumption of the refrigerating circuit based on the non-azeotropic mixed working medium is reduced, and the energy efficiency is improved.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present 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 solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions.
Claims (6)
1. A refrigeration loop based on a non-azeotropic mixed working medium is characterized by comprising a first compressor, a second compressor, a first condenser, a second condenser, a first subcooler, an evaporator, a gas-liquid separator, a first throttling device and a second throttling device; outlets of the first compressor and the second compressor are respectively connected with an inlet of the first condenser, the condenser is connected with an inlet of the gas-liquid separator, an air outlet of the gas-liquid separator is connected with an inlet of the second condenser, an outlet of the second condenser is connected with the first throttling device sequentially through the first subcooler, the first throttling device is connected with an inlet of the evaporator, and an outlet of the evaporator is connected with an inlet of the first compressor; the liquid outlet of the gas-liquid separator is connected with a second throttling device, and the second throttling device is connected with the inlet of the second compressor through the first subcooler;
the refrigerant output by the first compressor and the refrigerant output by the second compressor are converged and enter the first condenser, the refrigerant enters the gas-liquid separator after being subjected to condensation treatment by the first condenser, the gas-liquid separator separates saturated refrigerant gas and saturated refrigerant liquid in the refrigerant, the saturated refrigerant gas is further condensed by the second condenser and then enters the evaporator through the first throttling device, and the saturated refrigerant liquid is subjected to throttling treatment by the second throttling device and enters the second compressor after being subjected to heat exchange by the first subcooler to complete circulation.
2. The refrigerating circuit based on the non-azeotropic mixed working medium of claim 1, further comprising a second subcooler, wherein the outlet of the evaporator is connected with the inlet of the first compressor through the second subcooler, and the liquid outlet of the gas-liquid separator is connected with the second throttling device through the second subcooler.
3. The non-azeotropic refrigerant mixture-based refrigeration circuit according to claim 2, further comprising a third subcooler, wherein the liquid outlet of the gas-liquid separator is connected to the second subcooler through the third subcooler, and the first subcooler is connected to the inlet of the second compressor through the third subcooler.
4. The non-azeotropic refrigerant mixture-based refrigeration circuit according to claim 3, wherein the saturated refrigerant gas output from the gas outlet of the gas-liquid separator sequentially passes through the second condenser, the hot fluid side of the first subcooler, the first throttling device, the evaporator and the cold fluid side of the second subcooler and then enters the first compressor.
5. The non-azeotropic refrigerant mixture-based refrigeration circuit according to claim 3, wherein the saturated refrigerant liquid outputted from the liquid outlet of the gas-liquid separator sequentially passes through the hot fluid side of the third subcooler, the hot fluid side of the second subcooler, the second throttling device, the cold fluid side of the first subcooler, and the cold fluid side of the third subcooler and then enters the second compressor.
6. Refrigeration plant, characterized in that it comprises a refrigeration circuit based on a zeotropic mixture of working substances according to any of claims 1 to 5.
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| CN201710779117.8A CN109425140B (en) | 2017-09-01 | 2017-09-01 | Refrigeration circuit and refrigeration plant based on non-azeotropic mixed working medium |
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| CN201710779117.8A CN109425140B (en) | 2017-09-01 | 2017-09-01 | Refrigeration circuit and refrigeration plant based on non-azeotropic mixed working medium |
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| CN109425140A CN109425140A (en) | 2019-03-05 |
| CN109425140B true CN109425140B (en) | 2020-12-18 |
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| CN114111076B (en) * | 2021-11-08 | 2023-07-21 | 清华大学 | Modularized non-azeotropic working medium relay evaporation refrigeration system and control method thereof |
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| CN106440626A (en) * | 2016-10-27 | 2017-02-22 | 青岛海尔特种电冰柜有限公司 | Multiple-temperature zone dual-refrigerating cycle system and multiple-temperature zone refrigeration device |
| CN106568218A (en) * | 2016-10-27 | 2017-04-19 | 青岛海尔特种电冰柜有限公司 | Multi-temperature-zone refrigerating loop system and multi-temperature-zone refrigerating equipment |
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2017
- 2017-09-01 CN CN201710779117.8A patent/CN109425140B/en active Active
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| CN101000192A (en) * | 2006-01-13 | 2007-07-18 | 博西华电器（江苏）有限公司 | Refrigeration system of refrigerator |
| CN201885474U (en) * | 2010-11-01 | 2011-06-29 | 上海轨道交通设备发展有限公司 | Cooling system for metro vehicle air-conditioning units |
| CN204165278U (en) * | 2014-10-11 | 2015-02-18 | 广东美的暖通设备有限公司 | Heat pump and the air-conditioner with it |
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