CN111174455B - Transcritical carbon dioxide double-stage compression refrigeration and defrosting system and application method thereof - Google Patents
Transcritical carbon dioxide double-stage compression refrigeration and defrosting system and application method thereof Download PDFInfo
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- CN111174455B CN111174455B CN202010083426.3A CN202010083426A CN111174455B CN 111174455 B CN111174455 B CN 111174455B CN 202010083426 A CN202010083426 A CN 202010083426A CN 111174455 B CN111174455 B CN 111174455B
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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
- F25B9/00—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point
- F25B9/002—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point characterised by the refrigerant
- F25B9/008—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point characterised by the refrigerant the refrigerant being carbon dioxide
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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
- F25B39/00—Evaporators; Condensers
- F25B39/02—Evaporators
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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
- F25B41/20—Disposition of valves, e.g. of on-off valves or flow control valves
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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
- F25B43/00—Arrangements for separating or purifying gases or liquids; Arrangements for vaporising the residuum of liquid refrigerant, e.g. by heat
- F25B43/006—Accumulators
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B47/00—Arrangements for preventing or removing deposits or corrosion, not provided for in another subclass
- F25B47/02—Defrosting cycles
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B7/00—Compression machines, plants or systems, with cascade operation, i.e. with two or more circuits, the heat from the condenser of one circuit being absorbed by the evaporator of the next circuit
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2309/00—Gas cycle refrigeration machines
- F25B2309/06—Compression machines, plants or systems characterised by the refrigerant being carbon dioxide
- F25B2309/061—Compression machines, plants or systems characterised by the refrigerant being carbon dioxide with cycle highest pressure above the supercritical pressure
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Analytical Chemistry (AREA)
- Power Engineering (AREA)
- Defrosting Systems (AREA)
Abstract
The invention discloses a transcritical carbon dioxide double-stage compression refrigeration and defrosting system and a using method thereof. The compression refrigeration loop comprises a high-pressure stage compressor, an air cooler group, a heat regenerator, a first depressurization structure, an indoor heat exchanger group, a liquid accumulator and a low-pressure stage compressor which are sequentially connected to be suitable for circulation of carbon dioxide working medium; the defrosting loop comprises a low-pressure stage compressor, an indoor heat exchanger group, a liquid reservoir and a defrosting evaporator which are sequentially connected to be suitable for carbon dioxide working medium circulation; the invention can improve defrosting performance and reduce energy consumption.
Description
Technical Field
The invention relates to the technical field of refrigeration, in particular to a transcritical carbon dioxide double-stage compression refrigeration and defrosting system and a using method thereof.
Background
The frosting phenomenon of the vapor compression refrigeration system in the environment below zero ℃ is an important problem affecting the performance and stable operation of the refrigeration system. At present, the freezing and refrigerating industry mainly uses an electric heating mode to defrost, and for the electric heating defrosting mode, not only the defrosting effect is general, but also the corresponding energy consumption is higher, especially for a two-stage compression system of carbon dioxide working medium, the pressure in the system is higher, the pressure difference between the high-pressure side and the low-pressure side is large, and the traditional method for defrosting by utilizing the four-way reversing valve to change the trend of the working medium is difficult to realize.
Disclosure of Invention
The first object of the present invention is to provide a transcritical carbon dioxide dual-stage compression refrigeration and defrosting system to solve the technical problems of optimizing defrosting effect and reducing energy consumption.
The second object of the present invention is to provide a method for using a transcritical carbon dioxide dual-stage compression refrigeration and defrosting system, so as to solve the technical problems of optimizing defrosting effect and reducing energy consumption.
The transcritical carbon dioxide double-stage compression refrigeration and defrosting system is realized by the following steps:
a transcritical carbon dioxide dual stage compression refrigeration and defrost system comprising:
the compression refrigeration loop comprises a high-pressure stage compressor, an air cooler group, a heat regenerator, a first depressurization structure, an indoor heat exchanger group, a liquid accumulator and a low-pressure stage compressor which are sequentially connected to be suitable for circulation of carbon dioxide working medium; wherein the low-pressure stage compressor is also connected with the heat regenerator and the heat regenerator is connected with the high-pressure stage compressor so that the compression refrigeration loop forms a circulation loop;
the defrosting loop comprises a low-pressure stage compressor, the indoor heat exchanger group, the liquid reservoir and a defrosting evaporator which are sequentially connected to be suitable for carbon dioxide working medium to flow through; the liquid reservoir is also connected with the low-pressure stage compressor through a third depressurization structure so that gas-phase carbon dioxide working medium separated from the liquid reservoir returns to the low-pressure stage compressor; and the defrosting evaporator is also connected with the low-pressure stage compressor so that the liquid-phase carbon dioxide working medium separated from the liquid reservoir passes through the second depressurization structure and then is transformed into the gas-phase carbon dioxide working medium through the defrosting evaporator, and then the gas-phase carbon dioxide working medium returns to the low-pressure stage compressor.
In a preferred embodiment of the present invention, the first depressurization structure is disposed on a flow pipeline between a regenerator of the compression refrigeration circuit and an indoor heat exchanger group; a first control valve is further arranged on a flow pipeline between the heat regenerator of the compression refrigeration loop and the indoor heat exchanger group; wherein the method comprises the steps of
The first control valve is arranged between the first depressurization structure and the heat regenerator.
In a preferred embodiment of the invention, a second control valve is arranged in the flow line between the accumulator of the compression refrigeration circuit and the low-pressure stage compressor.
In a preferred embodiment of the invention, a third control valve is provided in the flow line between the low-pressure stage compressor of the defrost circuit and the indoor heat exchanger group.
In a preferred embodiment of the present invention, the second pressure reducing structure is disposed on a flow pipeline between the liquid reservoir and the defrosting evaporator of the defrosting circuit, and a fourth control valve is further disposed on the flow pipeline between the liquid reservoir and the defrosting evaporator of the defrosting circuit; wherein the method comprises the steps of
The fourth control valve is arranged between the second depressurization structure and the liquid reservoir.
In a preferred embodiment of the present invention, the third pressure reducing structure is disposed on a flow pipeline between the liquid storage device of the defrosting circuit and the low-pressure stage compressor, and a one-way valve is further disposed on the flow pipeline between the liquid storage device of the defrosting circuit and the low-pressure stage compressor; wherein the method comprises the steps of
The one-way valve is arranged between the third depressurization structure and the low-pressure stage compressor.
In a preferred embodiment of the invention, the air cooler group comprises at least one air cooler; and
the indoor heat exchanger group comprises at least one indoor heat exchanger.
In a preferred embodiment of the present invention, the air cooler group includes two or more air coolers arranged in parallel.
In a preferred embodiment of the present invention, the indoor heat exchanger group includes two or more indoor heat exchangers arranged in parallel.
The application method of the transcritical carbon dioxide double-stage compression refrigeration and defrosting system is realized by the following steps:
the application method of the transcritical carbon dioxide double-stage compression refrigeration and defrosting system adopts the transcritical carbon dioxide double-stage compression refrigeration and defrosting system; comprising the following steps:
the compression refrigeration loop operates, carbon dioxide working medium in the system enters the air cooler group through the high-pressure stage compressor to cool and then is subjected to heat exchange through the heat regenerator, then enters the indoor heat exchanger group through the first depressurization structure to change phase, the phase-changed gas-phase or two-phase carbon dioxide working medium enters the liquid storage device to perform gas-liquid separation, and the separated gaseous carbon dioxide working medium returns to the low-pressure stage compressor to complete the two-stage compression of the carbon dioxide working medium;
the defrosting loop operates, carbon dioxide working medium in the system enters the indoor heat exchanger group to release heat and defrost after being compressed by the low-pressure stage compressor, the carbon dioxide working medium cooled by the indoor heat exchanger group enters the liquid storage device to carry out gas-liquid separation, and the gas-phase carbon dioxide working medium separated by the liquid storage device directly enters the compression cavity of the low-pressure stage compressor through the third depressurization structure to supplement air and increase enthalpy; the liquid-phase carbon dioxide working medium separated by the liquid accumulator enters the defrosting evaporator through the second depressurization structure to be changed into a gas-phase carbon dioxide working medium after phase change, and then the gas-phase carbon dioxide working medium returns to the low-pressure stage compressor to finish the defrosting process.
The beneficial effects of the invention are as follows: the transcritical carbon dioxide double-stage compression refrigeration and defrosting system and the use method thereof can improve the safety of the defrosting process of the system by utilizing the advantage of lower low-pressure side pressure in the structure of the transcritical carbon dioxide working medium double-stage compression refrigeration loop, and can enhance the defrosting performance of the defrosting loop by the air supplementing and enthalpy increasing functions of the defrosting loop, thereby improving the defrosting efficiency and reducing the energy consumption.
Drawings
The invention will be further described with reference to the drawings and examples.
Fig. 1 is a schematic diagram of the overall structure of a transcritical carbon dioxide dual stage compression refrigeration and defrost system of the present invention.
In the figure: the high-pressure stage compressor 1, the gas cooler 2, the regenerator 3, the first control valve 4, the first depressurization structure 5, the indoor heat exchanger 6, the liquid reservoir 7, the second control valve 8, the low-pressure stage compressor 9, the third control valve 10, the third depressurization structure 11, the check valve 12, the fourth control valve 13, the second depressurization structure 14 and the defrosting evaporator 15.
Detailed Description
Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the invention.
In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention.
Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "connected," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art. Furthermore, in the description of the present invention, unless otherwise indicated, the meaning of "a plurality" is two or more.
Example 1:
as shown in fig. 1, the present embodiment provides a transcritical carbon dioxide dual-stage compression refrigeration and defrosting system, which is suitable for refrigeration industries such as refrigeration, cold chain or refrigeration. The method specifically comprises the following steps: the device comprises a compression refrigeration loop suitable for carrying out double-stage compression on carbon dioxide working media and a defrosting loop suitable for defrosting an indoor heat exchanger of a refrigeration system.
In detail, the compression refrigeration loop comprises a high-pressure stage compressor 1, an air cooler group, a heat regenerator 3, a first depressurization structure 5, an indoor heat exchanger group, a liquid reservoir 7 and a low-pressure stage compressor 9 which are connected in sequence to be suitable for circulation of carbon dioxide working medium; wherein the low-pressure stage compressor 9 is also connected to the regenerator 3 and the regenerator 3 is connected to the high-pressure stage compressor 1 such that the compression refrigeration circuit forms a circulation circuit.
The defrosting loop comprises a low-pressure stage compressor 9, an indoor heat exchanger group, a liquid reservoir 7 and a defrosting evaporator 15 which are connected in sequence so as to be suitable for carbon dioxide working medium circulation; the liquid reservoir 7 is also connected with the low-pressure stage compressor 9 through a third depressurization structure 11 so that gas-phase carbon dioxide working medium separated from the liquid reservoir 7 returns to the low-pressure stage compressor 9; and the defrosting evaporator 15 is also connected with the low-pressure stage compressor 9 so that the liquid-phase carbon dioxide working medium separated from the liquid reservoir 7 passes through the second depressurization structure 14 and then is converted into the gas-phase carbon dioxide working medium through the defrosting evaporator 15 and then returns to the low-pressure stage compressor 9.
For the low-pressure stage compressor 9 and the high-pressure stage compressor 1 according to the present embodiment, one of, for example, but not limited to, a centrifugal compressor or a positive displacement compressor may be employed.
In summary, the compression refrigeration circuit and the defrosting circuit share three device structures, namely the low-pressure compressor 9, the indoor heat exchanger group and the liquid accumulator 7, so that the advantage of lower low-pressure side pressure in the structure of the compression refrigeration circuit can be utilized when the compression refrigeration circuit is used for carrying out double-stage compression on the transcritical carbon dioxide working medium, the safety of the defrosting process of the system can be improved, in addition, the defrosting performance of the defrosting circuit can be enhanced through the air supplementing enthalpy increasing function of the defrosting circuit, the defrosting efficiency is improved, the energy consumption can be reduced, the cooling requirement of a user can be met, and the frosting problem of the indoor heat exchanger can be rapidly and efficiently solved, so that the high-efficiency stable operation of the transcritical carbon dioxide double-stage compression refrigeration system is realized on the whole.
The switching control for the specific compression refrigeration circuit and the defrosting circuit is realized as follows:
first, the first depressurization structure 5 is arranged on a flow pipeline between the regenerator 3 of the compression refrigeration loop and the indoor heat exchanger group, and the flow pipeline is provided with a first control valve 4 at the upper sea; wherein the first control valve is arranged between the first depressurization structure 5 and the regenerator 3. A second control valve 8 is arranged in the flow line between the reservoir 7 of the compression refrigeration circuit and the low-pressure stage compressor 9.
Next, a third control valve 10 is provided in the flow line between the low-pressure stage compressor 9 of the defrost circuit and the indoor heat exchanger group. The second depressurization structure 14 is arranged on a flow pipeline between the liquid reservoir 7 and the defrosting evaporator 15 of the defrosting loop, and the flow pipeline is also provided with a fourth control valve 13; wherein a fourth control valve 13 is arranged between the second pressure reducing structure 14 and the reservoir 7.
Again, the third pressure reducing structure 11 is arranged on a flow pipeline between the liquid reservoir 7 of the defrosting loop and the low-pressure stage compressor 9, and the flow pipeline is also provided with a one-way valve 12; wherein a non-return valve 12 is arranged between the third pressure reducing structure 11 and the low-pressure stage compressor 9.
It should be further noted that, for each of the first pressure reducing structure 5, the second pressure reducing structure 14, and the third pressure reducing structure 11 of the present embodiment, for example, but not limited to, an expansion valve and an expander may be used to perform the pressure reducing function. The expansion valve, the expansion machine or the like is adopted, and the embodiment is not limited in any way.
In actual use, when the compression refrigeration circuit needs to be operated, specifically, the third control valve 10 and the fourth control valve 13 on the defrosting circuit are closed, and the first control valve 4 and the second control valve 8 on the compression refrigeration circuit are opened. And when the defrosting circuit needs to be operated, specifically, the first control valve 4 and the second control valve 8 on the compression refrigeration circuit are closed, and the third control valve 10 and the fourth control valve 13 on the defrosting circuit are opened.
It should be noted that, for the air cooler set of this embodiment, at least one air cooler 2 is included; and the indoor heat exchanger group comprises at least one indoor heat exchanger 6. In connection with the drawings of the present embodiment, only one gas cooler 2 and one indoor heat exchanger 6 are exemplified here. Actually, the structure can be multiple according to the actual situation. When the number of the air cooler groups and the number of the indoor heat exchangers are more than one, namely two or more than two, the two or more than two air coolers 2 are in parallel connection, and the two or more than two indoor heat exchangers 6 are also in parallel connection.
Example 2:
on the basis of the transcritical carbon dioxide double-stage compression refrigeration and defrosting system of the embodiment 1, the embodiment provides a use method of the transcritical carbon dioxide double-stage compression refrigeration and defrosting system, in particular to the transcritical carbon dioxide double-stage compression refrigeration and defrosting system of the embodiment 1; comprising two loop processes: specifically, the compression refrigeration circuit operates and the defrosting circuit operates.
For the operation of the compression refrigeration loop, the third control valve 10 and the fourth control valve 13 on the defrosting loop are closed, and the first control valve 4 and the second control valve 8 on the compression refrigeration loop are opened simultaneously, so that carbon dioxide working medium in the system enters the air cooler group through the high-pressure stage compressor 1 to exchange heat through the heat regenerator 3 after being cooled, enters the indoor heat exchanger 6 to absorb indoor heat through phase change after being throttled and depressurized by the first depressurization structure 5, enters the liquid storage device 7 for gas-liquid separation of the phase-changed gas-phase or two-phase carbon dioxide working medium, and returns to the low-pressure stage compressor 9 after the separation, thereby completing the circulation process of the two-stage compression of the carbon dioxide working medium.
The defrosting loop operates, the first control valve 4 and the second control valve 8 on the compression refrigeration loop are closed, and the third control valve 10 and the fourth control valve 13 on the defrosting loop are opened, so that carbon dioxide working media in the system enter the indoor heat exchanger 6 to release heat and defrost after being compressed by the low-pressure stage compressor 9, the carbon dioxide working media cooled by the indoor heat exchanger 6 enter the liquid storage device 7 to carry out gas-liquid separation, and the gas-phase carbon dioxide working media separated by the liquid storage device 7 directly enter the compression cavity of the low-pressure stage compressor 9 again through the third depressurization structure 11 and the one-way valve 12 to supplement air and increase enthalpy to improve defrosting performance. The liquid-phase carbon dioxide working medium separated by the liquid accumulator 7 enters the defrosting evaporator 15 through the fourth control valve 13 and the second depressurization structure 14 to be converted into gas-phase carbon dioxide working medium after phase change heat absorption, and then the gas-phase carbon dioxide working medium returns to the low-pressure stage compressor 9, so that the defrosting cycle process is completed.
In this specification, a schematic representation of the terms does not necessarily refer to the same embodiment. Furthermore, the particular features, structures, materials, or characteristics may be combined in any suitable manner in any one or more embodiments.
With the above-described preferred embodiments according to the present invention as an illustration, the above-described descriptions can be used by persons skilled in the relevant art to make various changes and modifications without departing from the scope of the technical idea of the present invention. The technical scope of the present invention is not limited to the description, but must be determined according to the scope of claims.
Claims (5)
1. A transcritical carbon dioxide dual stage compression refrigeration and defrost system comprising:
the compression refrigeration loop comprises a high-pressure stage compressor, an air cooler group, a heat regenerator, a first depressurization structure, an indoor heat exchanger group, a liquid accumulator and a low-pressure stage compressor which are sequentially connected to be suitable for circulation of carbon dioxide working medium; wherein the low-pressure stage compressor is also connected with the heat regenerator and the heat regenerator is connected with the high-pressure stage compressor so that the compression refrigeration loop forms a circulation loop;
the defrosting loop comprises a low-pressure stage compressor, the indoor heat exchanger group, the liquid reservoir and a defrosting evaporator which are sequentially connected to be suitable for carbon dioxide working medium to flow through; the liquid accumulator is also connected with the low-pressure stage compressor through a third depressurization structure so that gas-phase carbon dioxide working medium separated from the liquid accumulator returns to the compression cavity of the low-pressure stage compressor to supplement air and increase enthalpy; the defrosting evaporator is also connected with the low-pressure stage compressor so that liquid-phase carbon dioxide working medium separated from the liquid reservoir passes through the second depressurization structure and then is transformed into gas-phase carbon dioxide working medium through the defrosting evaporator, and the gas-phase carbon dioxide working medium returns to the low-pressure stage compressor;
the first depressurization structure is arranged on a flow pipeline between the heat regenerator of the compression refrigeration loop and the indoor heat exchanger group; a first control valve is further arranged on a flow pipeline between the heat regenerator of the compression refrigeration loop and the indoor heat exchanger group; the first control valve is arranged between the first depressurization structure and the heat regenerator;
a second control valve is arranged on a flow pipeline between the liquid storage device of the compression refrigeration loop and the low-pressure stage compressor; a third control valve is arranged on a circulation pipeline between the low-pressure stage compressor of the defrosting loop and the indoor heat exchanger group;
the second depressurization structure is arranged on a flow pipeline between the liquid reservoir and the defrosting evaporator of the defrosting loop, and a fourth control valve is further arranged on the flow pipeline between the liquid reservoir and the defrosting evaporator of the defrosting loop; the fourth control valve is arranged between the second depressurization structure and the liquid reservoir;
the third depressurization structure is arranged on a flow pipeline between the liquid reservoir of the defrosting loop and the compression cavity of the low-pressure stage compressor, and a one-way valve is further arranged on the flow pipeline between the liquid reservoir of the defrosting loop and the compression cavity of the low-pressure stage compressor; the one-way valve is arranged between the third depressurization structure and the compression cavity of the low-pressure stage compressor.
2. The transcritical carbon dioxide dual stage compression refrigeration and defrost system of claim 1, wherein said air cooler bank comprises at least one air cooler; and
the indoor heat exchanger group comprises at least one indoor heat exchanger.
3. The transcritical carbon dioxide dual stage compression refrigeration and defrost system of claim 2, wherein the gas cooler bank comprises two or more gas coolers arranged in parallel.
4. The transcritical carbon dioxide dual stage compression refrigeration and defrost system of claim 2, wherein the indoor heat exchanger group comprises two or more indoor heat exchangers arranged in parallel.
5. A method for using a transcritical carbon dioxide dual-stage compression refrigeration and defrost system, characterized in that the transcritical carbon dioxide dual-stage compression refrigeration and defrost system according to any one of claims 1-4 is used; comprising the following steps:
the compression refrigeration loop operates, carbon dioxide working medium in the system enters the air cooler group through the high-pressure stage compressor to cool and then is subjected to heat exchange through the heat regenerator, then enters the indoor heat exchanger group through the first depressurization structure to change phase, the phase-changed gas-phase or two-phase carbon dioxide working medium enters the liquid storage device to perform gas-liquid separation, and the separated gaseous carbon dioxide working medium returns to the low-pressure stage compressor to complete the two-stage compression of the carbon dioxide working medium;
the defrosting loop operates, carbon dioxide working medium in the system enters the indoor heat exchanger group to release heat and defrost after being compressed by the low-pressure stage compressor, the carbon dioxide working medium cooled by the indoor heat exchanger group enters the liquid storage device to carry out gas-liquid separation, and the gas-phase carbon dioxide working medium separated by the liquid storage device directly enters the compression cavity of the low-pressure stage compressor through the third depressurization structure to supplement air and increase enthalpy; the liquid-phase carbon dioxide working medium separated by the liquid accumulator enters the defrosting evaporator through the second depressurization structure to be changed into a gas-phase carbon dioxide working medium after phase change, and then the gas-phase carbon dioxide working medium returns to the low-pressure stage compressor to finish the defrosting process.
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| CN114608216A (en) * | 2022-05-14 | 2022-06-10 | 中国能源建设集团山西省电力勘测设计院有限公司 | Defrosting method of high-energy-efficiency transcritical carbon dioxide double-stage compression cold-hot combined supply system |
| CN115307324A (en) * | 2022-07-29 | 2022-11-08 | 青岛海尔空调电子有限公司 | Cascade heat pump system and defrosting control method thereof |
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