CN110645736A - Direct-current variable-frequency carbon dioxide heat pump cold and hot unit - Google Patents
Direct-current variable-frequency carbon dioxide heat pump cold and hot unit Download PDFInfo
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- CN110645736A CN110645736A CN201911004264.3A CN201911004264A CN110645736A CN 110645736 A CN110645736 A CN 110645736A CN 201911004264 A CN201911004264 A CN 201911004264A CN 110645736 A CN110645736 A CN 110645736A
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- heat exchange
- valve port
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- valve
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- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 title claims abstract description 94
- 229910002092 carbon dioxide Inorganic materials 0.000 title claims abstract description 47
- 239000001569 carbon dioxide Substances 0.000 title claims abstract description 47
- 239000003507 refrigerant Substances 0.000 claims abstract description 31
- 238000010438 heat treatment Methods 0.000 claims abstract description 27
- 238000001816 cooling Methods 0.000 claims abstract description 12
- 238000006243 chemical reaction Methods 0.000 claims abstract description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 14
- 238000005057 refrigeration Methods 0.000 claims description 9
- 239000007788 liquid Substances 0.000 claims description 7
- 230000001502 supplementing effect Effects 0.000 claims description 3
- 239000003921 oil Substances 0.000 description 15
- 238000000034 method Methods 0.000 description 4
- 230000006835 compression Effects 0.000 description 3
- 238000007906 compression Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 239000010687 lubricating oil Substances 0.000 description 2
- 239000013589 supplement Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 230000001050 lubricating effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 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
- F25B29/00—Combined heating and refrigeration systems, e.g. operating alternately or simultaneously
- F25B29/003—Combined heating and refrigeration systems, e.g. operating alternately or simultaneously of the compression type system
-
- 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
- F25B13/00—Compression machines, plants or systems, with reversible cycle
-
- 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
-
- 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
- F25B2313/00—Compression machines, plants or systems with reversible cycle not otherwise provided for
- F25B2313/027—Compression machines, plants or systems with reversible cycle not otherwise provided for characterised by the reversing means
- F25B2313/02741—Compression machines, plants or systems with reversible cycle not otherwise provided for characterised by the reversing means using one four-way valve
-
- 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
- F25B2400/19—Pumping down refrigerant from one part of the cycle to another part of the cycle, e.g. when the cycle is changed from cooling to heating, or before a defrost cycle is started
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Heat-Pump Type And Storage Water Heaters (AREA)
Abstract
The invention discloses a direct-current frequency conversion carbon dioxide heat pump cold and hot unit which comprises a compressor, an air cooler, a first expansion valve, a second expansion valve, an evaporator, a four-way valve and an air-supply enthalpy-increasing heat exchanger, wherein the air cooler is internally provided with a first heat exchange channel and a heat exchange water channel which exchange heat mutually, the air-supply enthalpy-increasing heat exchanger is internally provided with a second heat exchange pipeline and a third heat exchange pipeline which exchange heat mutually, the compressor is a direct-current frequency conversion compressor, the switching between a heating mode and a cooling mode of a heat pump unit is realized by controlling the opening and closing of each valve port of the four-way valve, in the heating mode, the compressor, a first valve port, a fourth valve port, a first heat exchange pipeline, a second heat exchange pipeline, a first expansion valve, the evaporator, a third valve port and a second valve port are communicated in sequence through a refrigerant pipeline, and in the cooling mode, the compressor, the, The second heat exchange pipeline, the first heat exchange pipeline, the fourth valve port and the second valve port are communicated in sequence through a refrigerant pipeline.
Description
Technical Field
The invention belongs to the technical field of carbon dioxide heat pumps, and particularly relates to a direct-current variable-frequency carbon dioxide heat pump cooling and heating unit.
Background
The carbon dioxide heat pump unit adopts carbon dioxide as a refrigerant, the heat release of the carbon dioxide is supercritical circulation, the thermophysical property of the carbon dioxide is utilized, the exhaust temperature of the compressor is high, the energy efficiency ratio is high, and the carbon dioxide heat pump unit is widely applied to various heating systems and hot water engineering. The carbon dioxide heat pump unit generally comprises a compressor, an air cooler, an expansion valve and an evaporator which are sequentially connected through a refrigerant pipeline, wherein the refrigerant pipeline can exchange heat with a water channel at a user end on the air cooler side, so that hot water is supplied to a user, the single-stage carbon dioxide heat pump unit can normally work at about-25 ℃, and has the characteristic of high primary outlet water temperature, and the single outlet water temperature is as high as 90 ℃. However, the existing carbon dioxide heat pump generally has no cold and hot continuous supply type unit, namely, the heat pump can not realize heat supply and refrigeration like an air conditioner, and the application range is single.
Disclosure of Invention
In order to solve the technical problems, the invention aims to provide a direct-current variable-frequency carbon dioxide heat pump cold and heat unit which can realize heating and refrigeration and has a wider application range.
In order to achieve the purpose of the invention, the invention adopts the following technical scheme:
a direct current frequency conversion carbon dioxide heat pump cooling and heating unit comprises:
a compressor;
the air cooler is internally provided with a first heat exchange pipeline and a heat exchange water path which exchange heat with each other;
a first expansion valve;
an evaporator; it is characterized in that the direct-current frequency conversion carbon dioxide heat pump cold and hot unit also comprises a heat pump,
a four-way valve disposed between the compressor and the air cooler, the four-way valve having a first valve port, a second valve port, a third valve port, and a fourth valve port;
the air-supplying enthalpy-increasing heat exchanger is arranged between the air cooler and the first expansion valve, a second heat exchange pipeline and a third heat exchange pipeline which exchange heat with each other are arranged in the air-supplying enthalpy-increasing heat exchanger, one end part of the third heat exchange pipeline is communicated with the second heat exchange pipeline, the other end part of the third heat exchange pipeline is communicated with an air inlet of the compressor, and a second expansion valve is arranged between the second heat exchange pipeline and the third heat exchange pipeline;
the compressor is a direct-current variable-frequency compressor, the direct-current variable-frequency carbon dioxide heat pump cold and hot unit has a heating mode and a cooling mode, in the heating mode, the first valve port is communicated with the fourth valve port, the second valve port is communicated with the third valve port, the first expansion valve and the second expansion valve are both in an open state, the compressor, the first valve port, the fourth valve port, the first heat exchange pipeline, the second heat exchange pipeline, the first expansion valve, the evaporator, the third valve port and the second valve port are sequentially communicated through a refrigerant pipeline to form a heating loop for circulating a carbon dioxide refrigerant, and part of the carbon dioxide refrigerant sequentially returns to the compressor through the second heat exchange pipeline, the second expansion valve and the third heat exchange pipeline to form an air supplementing loop;
in the refrigeration mode, the first valve port is communicated with the third valve port, the second valve port is communicated with the fourth valve port, the first expansion valve is in an open state, the second expansion valve is in a closed state, and the compressor, the first valve port, the third valve port, the evaporator, the first expansion valve, the second heat exchange pipeline, the first heat exchange pipeline, the fourth valve port and the second valve port are sequentially communicated through a refrigerant pipeline to form a refrigeration loop for circulating carbon dioxide refrigerant.
In the above technical solution, preferably, the oil separator further includes an inlet, an outlet and an oil discharge port, the inlet of the oil separator is communicated with the air outlet of the compressor, the outlet of the oil separator is communicated with the first valve port, and the oil discharge port of the oil separator is communicated with the oil return port of the compressor.
In the above technical solution, it is preferable that the valve further includes a gas-liquid separator, and the gas-liquid separator communicates the second valve port and the air inlet of the compressor.
According to the invention, the four-way valve is arranged, and the switching of the heating mode and the refrigerating mode is realized by respectively controlling the opening and closing of each valve port, so that the carbon dioxide heat pump unit has the heating and refrigerating functions at the same time, and the application range is wider; by arranging the air-supplementing enthalpy-increasing heat exchanger and the second expansion valve, air is supplemented to the compressor by opening the second expansion valve in the heating mode, the compression ratio of the unit is reduced, and the energy efficiency and the heating performance are improved; the variable frequency compressor replaces the traditional fixed frequency compressor, the working frequency of the compressor can be controlled, the input power of the compressor is reduced, and the energy consumption of a unit is reduced.
Drawings
FIG. 1 is a structural schematic diagram of a direct-current variable-frequency carbon dioxide heat pump cold and hot unit in a heating mode;
FIG. 2 is a schematic diagram of the structure of the direct-current variable-frequency carbon dioxide heat pump cold and hot unit in the refrigeration mode;
wherein: 11. a compressor; 12. an air cooler; 121. a first heat exchange conduit; 122. a heat exchange waterway; 13. a first expansion valve; 14. an evaporator; 15. a four-way valve; 151. a first valve port; 152. a second valve port; 153. a third valve port; 154. a fourth valve port; 16. a vapor-supplementing enthalpy-increasing heat exchanger; 161. a second heat exchange conduit; 162. a third heat exchange conduit; 17. a second expansion valve; 18. an oil separator; 19. a gas-liquid separator.
Detailed Description
For the purpose of illustrating the technical content, the constructional features, the achieved objects and the effects of the invention in detail, reference will be made to the following detailed description of the embodiments in conjunction with the accompanying drawings.
As shown in fig. 1-2, the direct-current variable-frequency carbon dioxide heat pump cooling and heating unit includes a compressor 11, a four-way valve 15, an air cooler 12, an air-make-up enthalpy-increasing heat exchanger 16, a first expansion valve 13, a second expansion valve 17, and an evaporator 14.
Wherein, the compressor 11 is a DC variable frequency compressor 11. The four-way valve 15 is disposed between the compressor 11 and the air cooler 12, and has a first port 151, a second port 152, a third port 153, and a fourth port 154. The air cooler 12 has a first heat exchange pipe 121 and a heat exchange water path 122 inside for exchanging heat with each other. The air-supplement enthalpy-increasing heat exchanger 16 is disposed between the air cooler 12 and the first expansion valve 13, a second heat exchange pipe 161 and a third heat exchange pipe 162 for exchanging heat with each other are disposed inside the air-supplement enthalpy-increasing heat exchanger 16, one end of the third heat exchange pipe 162 is communicated with the second heat exchange pipe 161, the other end is communicated with an air inlet of the compressor 11, and the second expansion valve 17 is disposed between the second heat exchange pipe 161 and the third heat exchange pipe 162.
As shown in fig. 1, in the heating mode, the first valve port 151 and the fourth valve port 154 are communicated, the second valve port 152 and the third valve port 153 are communicated, the first expansion valve 13 and the second expansion valve 17 are both in an open state, the compressor 11, the first valve port 151, the fourth valve port 154, the first heat exchange pipe 121, the second heat exchange pipe 161, the first expansion valve 13, the evaporator 14, the third valve port 153, and the second valve port 152 are sequentially communicated through a refrigerant pipe to form a heating circuit for circulating a carbon dioxide refrigerant, and a part of the carbon dioxide refrigerant is sequentially returned to the compressor 11 through the second heat exchange pipe 161, the second expansion valve 17, and the third heat exchange pipe 162 to form a gas supplementing circuit. The specific working principle is that the carbon dioxide refrigerant is compressed by the compressor 11 to work and then turns into high-temperature and high-pressure gas, and the gas enters the first heat exchange pipeline 121 of the air cooler 12 after passing through the first valve port 151 and the fourth valve port 154 of the four-way valve 15, and exchanges heat with the heat exchange waterway 122 through the first heat exchange pipeline 121, so that most of the heat is transferred to the heat exchange waterway 122 to supply the required hot water to the user side; then, the carbon dioxide refrigerant enters the second heat exchange pipeline 161 of the air-supply enthalpy-increasing heat exchanger 16, and is divided into two paths after coming out of the second heat exchange pipeline 161, one path of carbon dioxide refrigerant enters the evaporator 14 after passing through the first expansion valve 13, and exchanges heat with the external environment through the evaporator 14, absorbs heat in the external environment to increase the temperature, and finally returns to the compressor 11, so that the heating cycle process of the carbon dioxide refrigerant is completed. The other path of carbon dioxide refrigerant from the second heat exchange pipeline 161 enters the third heat exchange pipeline 162 of the air-supplementing enthalpy-increasing heat exchanger 16 through the second expansion valve 17, exchanges heat with the carbon dioxide refrigerant in the second heat exchange pipeline 161, absorbs heat, and returns to the compressor 11, so that the air-supplementing process is completed. In the process, the air supply loop is added, so that the air inflow of the compressor 11 is increased, the compression ratio of the heat pump unit can be reduced on the whole, more heating capacity is obtained, the heating performance of the heat pump unit is improved, and the air supply heat pump unit is very suitable for being applied in extremely cold areas or environments requiring high-temperature water.
As shown in fig. 2, in the cooling mode, the first valve port 151 and the third valve port 153 are communicated, the second valve port 152 and the fourth valve port 154 are communicated, the first expansion valve 13 is in an open state, the second expansion valve 17 is in a closed state, and the compressor 11, the first valve port 151, the third valve port 153, the evaporator 14, the first expansion valve 13, the second heat exchange pipe 161, the first heat exchange pipe 121, the fourth valve port 154, and the second valve port 152 are sequentially communicated through a refrigerant pipe to form a cooling circuit for circulating a carbon dioxide refrigerant. The specific working principle is that the carbon dioxide refrigerant is compressed by the compressor 11 to work and then changed into high-temperature and high-pressure gas, and the gas enters the evaporator 14 through the first valve port 151 and the third valve port 153, and exchanges heat with the external environment through the evaporator 14, most of the heat carried by the gas is dissipated to the external environment, the temperature is reduced, the gas enters the second heat exchange pipeline 161 of the gas-supplementing enthalpy-increasing heat exchanger 16 through the first expansion valve 13, the carbon dioxide refrigerant coming out of the second heat exchange pipeline 161 enters the first heat exchange pipeline 121 of the gas cooler 12, and exchanges cold through the first heat exchange pipeline 121 and the heat exchange water path 122, so as to absorb the heat of the heat exchange water path 122, so that the water in the heat exchange water path 122 is cooled, chilled water can be supplied to a user, and the heat exchanged carbon dioxide refrigerant returns to the compressor 11 after sequentially passing through the fourth valve port 154 and the second valve port 152 of the four, so as to complete the refrigeration cycle process of the carbon dioxide refrigerant.
In order to separate a small amount of lubricating oil mixed into the carbon dioxide refrigerant during the compression operation of the compressor 11 and to enable the lubricating oil to participate in the lubricating operation of the internal components of the compressor 11 again, an oil separator 18 is further disposed between the compressor 11 and the four-way valve 15, the oil separator 18 has an inlet, an outlet and an oil discharge port, the outlet of the oil separator 18 is communicated with the first valve port 151 of the four-way valve 15, and the oil discharge port of the oil separator 18 is communicated with the oil return port of the compressor 11.
In order to filter impurities, a gas-liquid separator 19 is further provided between the four-way valve 15 and the compressor 11, and the gas-liquid separator 19 communicates the second valve port 152 with the air inlet of the compressor 11.
No matter the direct current frequency conversion carbon dioxide heat pump cold and hot unit of this scheme is under the mode of heating or under the mode of refrigeration, all adopt direct current frequency conversion compressor to replace traditional fixed frequency compressor to control the operating frequency of compressor, make its input power reduce, the energy consumption is littleer.
The above embodiments are merely illustrative of the technical ideas and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the protection scope of the present invention. All equivalent changes or modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.
Claims (3)
1. A direct current frequency conversion carbon dioxide heat pump cooling and heating unit comprises:
a compressor (11);
the air cooler (12) is internally provided with a first heat exchange pipeline (121) and a heat exchange water path (122) which exchange heat with each other;
a first expansion valve (13);
an evaporator (14); it is characterized in that the direct-current frequency conversion carbon dioxide heat pump cold and hot unit also comprises a heat pump,
a four-way valve (15) disposed between the compressor (11) and the air cooler (12), the four-way valve (15) having a first port (151), a second port (152), a third port (153), and a fourth port (154);
the air-supplying enthalpy-increasing heat exchanger (16) is arranged between the air cooler (12) and the first expansion valve (13), a second heat exchange pipeline (161) and a third heat exchange pipeline (162) which exchange heat with each other are arranged in the air-supplying enthalpy-increasing heat exchanger (16), one end part of the third heat exchange pipeline (162) is communicated with the second heat exchange pipeline (161), the other end part of the third heat exchange pipeline is communicated with an air inlet of the compressor (11), and a second expansion valve (17) is arranged between the second heat exchange pipeline (161) and the third heat exchange pipeline (162);
the compressor (11) is a direct-current variable-frequency compressor, the direct-current variable-frequency carbon dioxide heat pump chiller-heater unit has a heating mode and a cooling mode, in the heating mode, the first valve port (151) and the fourth valve port (154) are communicated, the second valve port (152) and the third valve port (153) are communicated, the first expansion valve (13) and the second expansion valve (17) are both in an open state, the compressor (11), the first valve port (151), the fourth valve port (154), the first heat exchange pipeline (121), the second heat exchange pipeline (161), the first expansion valve (13), the evaporator (14), the third valve port (153) and the second valve port (152) are sequentially communicated through refrigerant pipelines to form a heating loop for circulating carbon dioxide refrigerant, and part of the carbon dioxide heat exchange refrigerant sequentially passes through the second heat exchange pipeline (161), the first expansion valve (13), the evaporator (14), the third valve port (153) and the second valve port (152), The second expansion valve (17) and the third heat exchange pipeline (162) return to the compressor (11) to form a gas supplementing loop;
in the refrigeration mode, the first valve port (151) and the third valve port (153) are communicated, the second valve port (152) and the fourth valve port (154) are communicated, the first expansion valve (13) is in an open state, the second expansion valve (17) is in a closed state, and the compressor (11), the first valve port (151), the third valve port (153), the evaporator (14), the first expansion valve (13), the second heat exchange pipeline (161), the first heat exchange pipeline (121), the fourth valve port (154) and the second valve port (152) are sequentially communicated through refrigerant pipelines to form a refrigeration loop for carbon dioxide refrigerant circulation.
2. The direct-current variable-frequency carbon dioxide heat pump cooling and heating unit according to claim 1, characterized in that: the oil separator (18) is provided with an inlet, an outlet and an oil outlet, the inlet of the oil separator (18) is communicated with the air outlet of the compressor (11), the outlet of the oil separator (18) is communicated with the first valve port (151), and the oil outlet of the oil separator (18) is communicated with the oil return port of the compressor (11).
3. The direct-current variable-frequency carbon dioxide heat pump cooling and heating unit according to claim 1, characterized in that: the gas-liquid separator (19) is further included, and the gas-liquid separator (19) is communicated with the second valve port (152) and the air inlet of the compressor (11).
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2019105747983 | 2019-06-28 | ||
| CN201910574798 | 2019-06-28 |
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| Publication Number | Publication Date |
|---|---|
| CN110645736A true CN110645736A (en) | 2020-01-03 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911004264.3A Pending CN110645736A (en) | 2019-06-28 | 2019-10-22 | Direct-current variable-frequency carbon dioxide heat pump cold and hot unit |
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| Country | Link |
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| CN (1) | CN110645736A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114739029A (en) * | 2021-01-07 | 2022-07-12 | 中国科学院理化技术研究所 | Multipurpose carbon dioxide heat pump cold and heat combined supply system |
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| CN211233445U (en) * | 2019-06-28 | 2020-08-11 | 江苏雪龙新能源科技有限公司 | Direct-current variable-frequency carbon dioxide heat pump cold and hot unit |
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2019
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| WO2007059709A1 (en) * | 2005-11-25 | 2007-05-31 | Gree Electric Appliances Inc. Of Zhuhai | A heat pump system for air conditioning under a low temperature and a using method thereof |
| EP2051027A2 (en) * | 2007-10-19 | 2009-04-22 | Stiebel Eltron GmbH & Co. KG | Heat pump assembly |
| CN205373189U (en) * | 2015-12-24 | 2016-07-06 | 青岛海尔新能源电器有限公司 | Low temperature heat pump system and air conditioner |
| CN206556313U (en) * | 2017-02-06 | 2017-10-13 | 刘勇 | Expansion gear and the CO for weather lower band air injection enthalpy-increasing loop of extremely trembling with fear2Heat pump |
| CN207540181U (en) * | 2017-08-29 | 2018-06-26 | 宁波奥克斯电气股份有限公司 | A kind of Gas-supplying enthalpy-increasing system of economizer |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114739029A (en) * | 2021-01-07 | 2022-07-12 | 中国科学院理化技术研究所 | Multipurpose carbon dioxide heat pump cold and heat combined supply system |
| CN114739029B (en) * | 2021-01-07 | 2024-04-19 | 中国科学院理化技术研究所 | Multipurpose carbon dioxide heat pump cold and hot combined supply system |
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