CN110173912B - Mixed working medium compression circulation system with mechanical heat recovery function and working method - Google Patents
Mixed working medium compression circulation system with mechanical heat recovery function and working method Download PDFInfo
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- CN110173912B CN110173912B CN201910356482.7A CN201910356482A CN110173912B CN 110173912 B CN110173912 B CN 110173912B CN 201910356482 A CN201910356482 A CN 201910356482A CN 110173912 B CN110173912 B CN 110173912B
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- 238000011084 recovery Methods 0.000 title claims abstract description 48
- 238000007906 compression Methods 0.000 title claims abstract description 25
- 238000000034 method Methods 0.000 title claims abstract description 23
- 230000006835 compression Effects 0.000 title claims abstract description 22
- 239000012530 fluid Substances 0.000 claims abstract description 32
- 239000003507 refrigerant Substances 0.000 claims description 99
- 239000007788 liquid Substances 0.000 claims description 46
- 238000009833 condensation Methods 0.000 claims description 10
- 230000005494 condensation Effects 0.000 claims description 10
- 238000001704 evaporation Methods 0.000 claims description 3
- 230000008020 evaporation Effects 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 abstract description 4
- 230000002427 irreversible effect Effects 0.000 abstract description 2
- 238000005057 refrigeration Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000000605 extraction Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000004378 air conditioning Methods 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 239000010842 industrial wastewater Substances 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
- F25B1/00—Compression machines, plants or systems with non-reversible cycle
- F25B1/10—Compression machines, plants or systems with non-reversible cycle with multi-stage compression
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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
- F25B40/00—Subcoolers, desuperheaters or superheaters
- F25B40/06—Superheaters
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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
- F25B41/31—Expansion valves
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B41/00—Fluid-circulation arrangements
- F25B41/40—Fluid line arrangements
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Sorption Type Refrigeration Machines (AREA)
- Other Air-Conditioning Systems (AREA)
Abstract
The invention relates to a mixed working medium compression cycle system with mechanical heat recovery and a working method thereof. Compared with the prior art, the invention further reduces the temperature of the solution before the expansion valve while recovering heat by adding mechanical heat recovery after the solution heat exchanger, the high-temperature heat released by the mechanical heat recovery can be used for preheating the high-temperature fluid at the side of the condenser, and through two-stage heat recovery, the temperature of the solution before the expansion valve can be reduced, so that the irreversible loss in the throttling process is reduced, the circulating heating capacity and the heating energy efficiency can be improved, and the circulating energy efficiency can be improved by about 10-20%.
Description
Technical Field
The invention relates to the technical field of refrigeration/heat pumps, in particular to a mixed working medium compression circulation system with mechanical heat recovery and a working method.
Background
With the rapid development of global economy, energy crisis and environmental pollution become increasingly serious, and the development of efficient clean refrigeration/heat extraction technology becomes urgent. As a new heat extraction method, heat pumps have attracted much attention because of their advantages such as high energy efficiency and simple structural features. The more mature refrigeration/heat pump technology at present is the vapor compression refrigeration/heat pump technology.
Fig. 1 is a schematic diagram of a conventional mechanical vapor compression cycle, in which a low-temperature and low-pressure liquid refrigerant evaporates and absorbs heat in an evaporator during operation, heat is generated from environment or industrial wastewater, the low-temperature and low-pressure refrigerant vapor is compressed by a compressor and then changed into high-temperature and high-pressure refrigerant vapor, the high-temperature and high-pressure refrigerant vapor is condensed in a condenser to release condensation heat, and the condensed high-pressure liquid refrigerant is throttled by an expansion valve and returns to the evaporator. For the mechanical vapor compression cycle, the energy efficiency of the system is limited by factors such as refrigerant, cycle and components, and the energy efficiency of the system is limited to a certain extent, for example, the energy efficiency of a household air conditioning system in practical operation in winter is less than 4. In order to improve the cycle efficiency, the applicant previously proposed a mixed working medium compression cycle with liquid pressurization, as shown in fig. 2, analysis shows that the energy efficiency of the cycle under the typical heating working condition in winter is about 4.5, and the lifting amplitude is limited.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a mixed working medium compression circulation system with mechanical heat recovery and a working method.
The purpose of the invention can be realized by the following technical scheme:
the invention provides a mixed working medium compression cycle system with mechanical heat recovery, which comprises an evaporator, a first compressor, a condenser, a first expansion valve, a gas-liquid separator, a mixer, a heat regenerator and a mechanical heat recovery assembly:
the evaporator is provided with a refrigerant channel for circulating a refrigerant and a low-temperature heat transfer working medium channel for circulating an external low-temperature heat transfer working medium, and the condenser is provided with a refrigerant channel for circulating a refrigerant and a high-temperature heat transfer working medium channel for circulating an external high-temperature heat transfer working medium;
the refrigerant outlet of the evaporator is connected with the inlet of the gas-liquid separator, the liquid outlet of the gas-liquid separator, the cold fluid channel of the heat regenerator and the liquid inlet of the mixer are sequentially connected, and the outlet of the mixer is connected with the refrigerant inlet of the condenser to form a first refrigerant flow path;
a refrigerant outlet of the condenser, a hot fluid channel of the heat regenerator, a mechanical heat recovery assembly, a first expansion valve and a refrigerant inlet of the evaporator are connected in sequence to form a second refrigerant flow path;
the gas outlet of the gas-liquid separator, the first compressor, and the gas inlet of the mixer are connected in this order to form a gas refrigerant flow path.
Preferably, the system further comprises a working medium pump, and the working medium pump is arranged on the first refrigerant flow path between the gas-liquid separator and the heat regenerator.
The invention adds mechanical heat recovery, namely heat recovery of a heat pump, behind the heat regenerator, and further reduces the temperature of the refrigerant in front of the expansion valve while recovering heat. The high temperature heat released by mechanical heat recovery can be used to preheat the high temperature fluid on the condenser side.
Preferably, the mechanical heat recovery assembly is used for recovering heat of liquid flowing out of a hot fluid channel of the heat regenerator and preheating external high-temperature heat transfer working medium entering a high-temperature heat transfer working medium channel of the condenser.
Preferably:
the mechanical heat recovery assembly comprises a mechanical heat recoverer, a second compressor, a preheater and a second expansion valve, the mechanical heat recoverer and the preheater are respectively provided with a hot fluid channel and a cold fluid channel, and the hot fluid channel of the mechanical heat recoverer is connected to a second refrigerant flow path;
and the outlet of the cold fluid channel of the mechanical heat recoverer, the second compressor, the hot fluid channel of the preheater, the second expansion valve and the inlet of the cold fluid channel of the mechanical heat recoverer are sequentially connected to form a third refrigerant flow path.
Preferably, the cold fluid channel of the preheater is used for circulating the external heat transfer working medium entering the high-temperature heat transfer working medium channel of the condenser.
The invention also provides a working method of the mixed working medium compression circulation system with mechanical heat recovery, which comprises the following steps:
the low-pressure evaporation process of the evaporator comprises the following steps: the low-temperature heat transfer working medium heats the refrigerant flowing to the evaporator through the second refrigerant flow path, the refrigerant is evaporated in the evaporator to absorb heat and is continuously gasified, the corresponding saturation temperature is continuously reduced to form temperature slippage, and finally the refrigerant flows to the gas-liquid separator;
the compression process of the first compressor and the pressurization process of the working medium pump are as follows: the first compressor compresses the gas refrigerant from the gas-liquid separator from a low-temperature low-pressure state to a high-temperature high-pressure state, and then conveys the gas refrigerant to the mixer through the gas refrigerant flow path; the liquid refrigerant from the gas-liquid separator is pressurized by the working medium pump and then is conveyed to the mixer through the first refrigerant flow path;
the high-pressure condensation process of the condenser: the mixed refrigerant is condensed in a condenser to release condensation heat, the corresponding saturation temperature is continuously reduced to form temperature slippage, and heat generated in the condensation process is taken away by a high-temperature heat transfer working medium;
mechanical heat recovery process: the refrigerant flowing out of the heat regenerator is the refrigerant with higher temperature, the refrigerant with higher temperature further releases heat in the mechanical heat recovery assembly, and the low-temperature refrigerant flowing out of the mechanical heat recovery assembly flows into the evaporator after being throttled by the first expansion valve.
Preferably, the heat released by the mechanical heat recovery assembly is used to preheat the external heat transfer medium entering the high temperature heat transfer medium passage of the condenser.
The refrigerant of the present invention is selected from non-azeotropic refrigerants and the like, and is not particularly limited herein. Meanwhile, the circulating system is not only suitable for the refrigeration working condition but also suitable for the heat pump working condition.
Compared with the prior art, the circulating system can effectively improve the operation energy efficiency, which is mainly attributed to the fact that the mechanical heat recovery, namely the heat recovery of a heat pump, is added behind the heat regenerator, and through the mechanical heat recovery, the temperature of the refrigerant in front of the expansion valve can be reduced, so that the irreversible loss in the throttling process is reduced, the circulating heating capacity and the refrigerating capacity can be improved, and the circulating energy efficiency can be improved by about 10-20%.
Drawings
FIG. 1 is a schematic view of a conventional vapor compression cycle system;
FIG. 2 is a schematic diagram of a conventional mixed working medium compression cycle system with liquid pressurization;
FIG. 3 is a schematic view of a circulation system according to embodiment 1 of the present invention.
In the figure, 1 is an evaporator, 2 is a first compressor, 3 is a condenser, 4 is a first expansion valve, 5 is a gas-liquid separator, 6 is a mixer, 7 is a regenerator, 8 is a working medium pump, 9 is a mechanical heat recovery device, 10 is a second compressor, 11 is a preheater, 12 is a second expansion valve, I is a first refrigerant flow path, II is a second refrigerant flow path, III is a third refrigerant flow path, and IV is a gas refrigerant flow path.
Detailed Description
The invention is described in detail below with reference to the figures and specific embodiments.
Example 1
A mixed working medium compression cycle system with mechanical heat recovery, as shown in fig. 3, includes an evaporator 1, a first compressor 2, a condenser 3, a first expansion valve 4, a gas-liquid separator 5, a mixer 6, a heat regenerator 7 and a mechanical heat recovery assembly:
in this embodiment, the evaporator 1 has a refrigerant passage for circulating a refrigerant and a low-temperature heat transfer working medium passage (i.e., a low-temperature end) for circulating an external low-temperature heat transfer working medium, the condenser 3 has a refrigerant passage for circulating a refrigerant and a high-temperature heat transfer working medium passage (i.e., a high-temperature end) for circulating an external high-temperature heat transfer working medium, the gas-liquid separator 5 has a liquid inlet, a liquid outlet and a gas outlet, and the mixer 6 has a liquid inlet, a gas inlet and an outlet;
in the embodiment, the refrigerant outlet of the evaporator 1 is connected with the inlet of the gas-liquid separator 5, the liquid outlet of the gas-liquid separator 5, the cold fluid channel of the heat regenerator 7 and the liquid inlet of the mixer 6 are sequentially connected, and the outlet of the mixer 6 is connected with the refrigerant inlet of the condenser 3 to form a first refrigerant flow path I; a refrigerant outlet of the condenser 3, a hot fluid channel of the heat regenerator 7, a mechanical heat recovery assembly, a first expansion valve 4 and a refrigerant inlet of the evaporator 1 are connected in sequence to form a second refrigerant flow path II; the gas outlet of the gas-liquid separator 5 and the gas inlet of the first compressor 2 and the mixer 6 are connected in this order to form a gas refrigerant flow path IV. In the present embodiment, it is preferable that the system further includes a working medium pump 8, and the working medium pump 8 is disposed on the first refrigerant flow path I between the gas-liquid separator 5 and the regenerator 7.
The mechanical heat recovery assembly in this embodiment is used to recover heat of liquid flowing out of the hot fluid channel of the heat regenerator 7 and preheat external high-temperature heat transfer working medium entering the high-temperature heat transfer working medium channel of the condenser 3. More specifically, the mechanical heat recovery assembly in the present embodiment includes a mechanical heat recoverer 9, a second compressor 10, a preheater 11, and a second expansion valve 12, the mechanical heat recoverer 9 and the preheater 11 each have a hot fluid channel and a cold fluid channel, and the hot fluid channel of the mechanical heat recoverer 9 is connected to the second refrigerant flow path II; the outlet of the cold fluid channel of the mechanical heat recoverer 9, the second compressor 10, the hot fluid channel of the preheater 11, the second expansion valve 12 and the inlet of the cold fluid channel of the mechanical heat recoverer 9 are connected in sequence to form a third refrigerant flow path III. The cold fluid channel of the preheater 11 in this embodiment is used to circulate the external heat transfer medium entering the high temperature heat transfer medium channel of the condenser 3.
The working method of the mixed working medium compression circulation system with the mechanical heat recovery function comprises the following steps:
the low-pressure evaporation process of the evaporator comprises the following steps: the low-temperature heat transfer working medium heats the refrigerant flowing to the evaporator 1 through the second refrigerant flow path II, the refrigerant is evaporated in the evaporator 1 to absorb heat and is continuously gasified, the corresponding saturation temperature is continuously reduced to form temperature slippage, and finally the refrigerant flows to the gas-liquid separator 5;
the compression process of the first compressor and the pressurization process of the working medium pump are as follows: the first compressor 2 compresses the gaseous refrigerant from the gas-liquid separator 5 from a low-temperature low-pressure state to a high-temperature high-pressure state, and then delivers the gaseous refrigerant to the mixer 6 through the gas refrigerant flow path IV; the liquid refrigerant from the gas-liquid separator 5 is pressurized by the working medium pump 8 and then is conveyed to the mixer 6 through the first refrigerant flow path I;
the high-pressure condensation process of the condenser: the mixed refrigerant is condensed in the condenser 3 to release condensation heat, the corresponding saturation temperature is continuously reduced to form temperature slippage, and heat generated in the condensation process is taken away by a high-temperature heat transfer working medium;
mechanical heat recovery process: the refrigerant flowing out of the regenerator 7 is a refrigerant having a higher temperature, the refrigerant having the higher temperature further releases heat in the mechanical heat recovery assembly, and the low-temperature refrigerant flowing out of the mechanical heat recovery assembly flows into the evaporator 1 after being throttled by the first expansion valve 4.
In this embodiment, the heat released by the mechanical heat recovery assembly is used to preheat the external heat transfer working medium entering the high temperature heat transfer working medium channel of the condenser 3.
Adopting a non-azeotropic refrigerant R32/R123, and assuming that the temperatures of outdoor air at an inlet and an outlet of an evaporator (low-temperature heat transfer working medium) are respectively 7 ℃ and 2 ℃; the temperatures of outdoor air at the inlet and outlet of the condenser (high-temperature heat transfer working medium) are respectively 20 ℃ and 35 ℃. The corresponding calculation results are shown in table 1. The energy efficiency of the circulation system of the invention is as high as 5.0, which is much higher than that of the traditional mechanical vapor compression refrigeration circulation system (shown in figure 1) under the same working condition and the mixed working medium compression circulation system with liquid pressurization (shown in figure 2).
TABLE 1 comparison of cycle performance
The embodiments described above are intended to facilitate the understanding and use of the invention by those skilled in the art. It will be readily apparent to those skilled in the art that various modifications to these embodiments may be made, and the generic principles described herein may be applied to other embodiments without the use of the inventive faculty. Therefore, the present invention is not limited to the above embodiments, and those skilled in the art should make improvements and modifications within the scope of the present invention based on the disclosure of the present invention.
Claims (5)
1. The utility model provides a take mechanical heat recovery's mixed working medium compression cycle system which characterized in that, includes evaporimeter (1), first compressor (2), condenser (3), first expansion valve (4), vapour and liquid separator (5), blender (6), regenerator (7) and mechanical heat recovery subassembly:
the evaporator (1) is provided with a refrigerant channel for circulating a refrigerant and a low-temperature heat transfer working medium channel for circulating an external low-temperature heat transfer working medium, and the condenser (3) is provided with a refrigerant channel for circulating a refrigerant and a high-temperature heat transfer working medium channel for circulating an external high-temperature heat transfer working medium;
the refrigerant outlet of the evaporator (1) is connected with the inlet of the gas-liquid separator (5), the liquid outlet of the gas-liquid separator (5), the cold fluid channel of the heat regenerator (7) and the liquid inlet of the mixer (6) are sequentially connected, and the outlet of the mixer (6) is connected with the refrigerant inlet of the condenser (3) to form a first refrigerant flow path (I);
a refrigerant outlet of the condenser (3), a hot fluid channel of the heat regenerator (7), a mechanical heat recovery assembly, a first expansion valve (4) and a refrigerant inlet of the evaporator (1) are connected in sequence to form a second refrigerant flow path (II);
a gas outlet of the gas-liquid separator (5), a gas inlet of the first compressor (2) and a gas inlet of the mixer (6) are connected in this order to form a gas refrigerant flow path (IV);
the mechanical heat recovery assembly is used for recovering heat of liquid flowing out of a hot fluid channel of the heat regenerator (7) and preheating external high-temperature heat transfer working medium entering a high-temperature heat transfer working medium channel of the condenser (3);
the mechanical heat recovery assembly comprises a mechanical heat recoverer (9), a second compressor (10), a preheater (11) and a second expansion valve (12), the mechanical heat recoverer (9) and the preheater (11) are respectively provided with a hot fluid channel and a cold fluid channel, and the hot fluid channel of the mechanical heat recoverer (9) is connected to a second refrigerant flow path (II);
and the outlet of a cold fluid channel of the mechanical heat recoverer (9), the second compressor (10), a hot fluid channel of the preheater (11), the second expansion valve (12) and the inlet of the cold fluid channel of the mechanical heat recoverer (9) are sequentially connected to form a third refrigerant flow path (III).
2. The mixed working medium compression cycle system with mechanical heat recovery as set forth in claim 1, characterized in that the system further comprises a working medium pump (8), said working medium pump (8) being disposed on the first refrigerant flow path (I) between the gas-liquid separator (5) and the regenerator (7).
3. A mixed working medium compression cycle system with mechanical heat recovery as set forth in claim 1, characterized in that the cold fluid channel of the preheater (11) is used for circulating the external heat transfer working medium entering the high temperature heat transfer working medium channel of the condenser (3).
4. The working method of the mixed working medium compression circulation system with the mechanical heat recovery function as claimed in any one of claims 1 to 3, characterized by comprising the following steps:
the low-pressure evaporation process of the evaporator comprises the following steps: the low-temperature heat transfer working medium heats the refrigerant flowing to the evaporator (1) through the second refrigerant flow path (II), the refrigerant is evaporated in the evaporator (1) to absorb heat and is continuously gasified, the corresponding saturation temperature is continuously reduced to form temperature slippage, and finally the refrigerant flows to the gas-liquid separator (5);
the compression process of the first compressor and the pressurization process of the working medium pump are as follows: the first compressor (2) compresses the gaseous refrigerant from the gas-liquid separator (5) from a low-temperature low-pressure state to a high-temperature high-pressure state, and then conveys the gaseous refrigerant to the mixer (6) through the gas refrigerant flow path (IV); the liquid refrigerant from the gas-liquid separator (5) is pressurized by a working medium pump (8) and then is conveyed to the mixer (6) through a first refrigerant flow path (I);
the high-pressure condensation process of the condenser: the mixed refrigerant is condensed in the condenser (3) to release condensation heat, the corresponding saturation temperature is continuously reduced to form temperature slippage, and heat generated in the condensation process is taken away by a high-temperature heat transfer working medium;
mechanical heat recovery process: the refrigerant flowing out of the heat regenerator (7) is the refrigerant with higher temperature, the refrigerant with higher temperature further releases heat in the mechanical heat recovery assembly, and the low-temperature refrigerant flowing out of the mechanical heat recovery assembly flows into the evaporator (1) after being throttled by the first expansion valve (4).
5. The working method of the mixed working medium compression cycle system with mechanical heat recovery as recited in claim 4, characterized in that the heat released by the mechanical heat recovery assembly is used to preheat the external heat transfer working medium entering the high temperature heat transfer working medium channel of the condenser (3).
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| CN201910356482.7A CN110173912B (en) | 2019-04-29 | 2019-04-29 | Mixed working medium compression circulation system with mechanical heat recovery function and working method |
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| CN109269132A (en) * | 2018-07-16 | 2019-01-25 | 同济大学 | A kind of mixed working fluid compression circulatory system of carrying liqs boost-up circuit |
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2019
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN87101531A (en) * | 1987-04-06 | 1988-10-19 | 张洪玉 | Energy saving refrigeration installation for miniature cold storage |
| JP4336619B2 (en) * | 2004-05-20 | 2009-09-30 | ヤンマー株式会社 | Engine heat pump |
| CN1632419A (en) * | 2004-12-28 | 2005-06-29 | 华南理工大学 | Self-folding type air source heat pump water heater |
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