CN113883487A - High-temperature heat pump steam generator - Google Patents
High-temperature heat pump steam generator Download PDFInfo
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- CN113883487A CN113883487A CN202010629047.XA CN202010629047A CN113883487A CN 113883487 A CN113883487 A CN 113883487A CN 202010629047 A CN202010629047 A CN 202010629047A CN 113883487 A CN113883487 A CN 113883487A
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- pipeline
- compressor
- steam generator
- heat exchanger
- heat pump
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- 239000007788 liquid Substances 0.000 claims abstract description 53
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 32
- 239000003507 refrigerant Substances 0.000 claims description 31
- 238000010438 heat treatment Methods 0.000 abstract description 8
- 239000007789 gas Substances 0.000 description 21
- 230000000694 effects Effects 0.000 description 15
- 238000000034 method Methods 0.000 description 8
- 230000008569 process Effects 0.000 description 8
- 238000005057 refrigeration Methods 0.000 description 6
- 238000000926 separation method Methods 0.000 description 6
- 238000005265 energy consumption Methods 0.000 description 5
- 238000001704 evaporation Methods 0.000 description 4
- 238000010521 absorption reaction Methods 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 238000004134 energy conservation Methods 0.000 description 2
- 230000008020 evaporation Effects 0.000 description 2
- 230000001502 supplementing effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000002912 waste gas Substances 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B1/00—Methods of steam generation characterised by form of heating method
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B30/00—Heat pumps
- F25B30/02—Heat pumps of the compression type
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P80/00—Climate change mitigation technologies for sector-wide applications
- Y02P80/10—Efficient use of energy, e.g. using compressed air or pressurized fluid as energy carrier
- Y02P80/15—On-site combined power, heat or cool generation or distribution, e.g. combined heat and power [CHP] supply
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Compression-Type Refrigeration Machines With Reversible Cycles (AREA)
Abstract
The invention discloses a high-temperature heat pump steam generator which comprises a heat exchanger, a compressor and a gas-liquid separator, wherein one side of the upper end of the heat exchanger is connected with a first pipeline through a hoop, the first pipeline is connected with a secondary reverse evaporator through a pipe hoop, the compressor is arranged on one side of the heat exchanger, a connector A is connected to one side wall of the compressor through threads, a fifth pipeline is connected between the connector A and the heat exchanger through the hoop, the upper end of the compressor is connected with a connector B through threads, the other side wall of the compressor is connected with a connector C through threads, and the gas-liquid separator is arranged on one side of the compressor, which is far away from the heat exchanger. Has the advantages that: through setting up heat exchanger, vapour and liquid separator, compressor and secondary anti-evaporimeter, can improve the heating efficiency of device, guarantee that vapor heat supply is sufficient, improve the result of use of device.
Description
Technical Field
The invention relates to the technical field of high-temperature heat pumps, in particular to a high-temperature heat pump steam generator.
Background
The high-temperature heat pump collects heat in medium and low-temperature waste water and waste gas discharged and wasted by industrial enterprises through the high-temperature heat energy heat pump, converts the heat into water or high-temperature steam with the temperature of less than or equal to 150 ℃, is used for industrial processes or heating, can directly replace a traditional coal-fired boiler, and is the best choice for realizing industrial energy conservation, consumption reduction and efficiency improvement.
The existing high-temperature heat pump steam generator is poor in heating efficiency, sufficient in steam supply cannot be guaranteed, the heat supply effect of the device is influenced, secondly, the existing high-temperature heat pump steam generator is single in circulation mode, most of the existing high-temperature heat pump steam generator is only high in circulation mode, the function is simple, the using effect is poor, in addition, the existing high-temperature heat pump steam generator cannot preheat water, the energy consumption of the steam generator can be increased, and the energy-saving effect is poor.
Disclosure of Invention
An object of the present invention is to provide a high temperature heat pump steam generator in order to solve the above problems.
The invention realizes the purpose through the following technical scheme:
the utility model provides a high temperature heat pump steam generator, includes heat exchanger, compressor and vapour and liquid separator, there is pipeline one heat exchanger upper end one side through the clamp connection, there is the anti-evaporimeter of secondary through the pipe hoop connection on the pipeline one, heat exchanger one side is provided with the compressor, there is joint A through threaded connection on the compressor lateral wall, joint A with there is pipeline five through the clamp connection between the heat exchanger, there is joint B compressor upper end through threaded connection, there is joint C through threaded connection on another lateral wall of compressor, the compressor is kept away from heat exchanger one side is provided with vapour and liquid separator.
Further, the heat exchanger comprises a water side heat exchange section and a refrigerant side heat exchange section on one side of the water side heat exchange section.
By adopting the technical scheme, the heat exchanger can exchange heat with water, the water is preheated through the water side heat exchange section, the heating efficiency of the steam generator can be improved, the energy saving performance of the device is improved, the refrigerant side heat exchange section can refrigerate, low-pressure refrigerant gas is lifted to high-pressure refrigerant gas through the compressor, so that the cycle process of compression, heat release, expansion and evaporation is realized, the working efficiency of the device is improved, sufficient heat supply of water vapor is ensured, gas-liquid separation is realized through the gas-liquid separator, the secondary reverse evaporator can perform secondary heat absorption on the refrigerant, the refrigeration effect is improved, and the water and the high-temperature section of the refrigerant exchange heat to output the water vapor to a user.
Further, joint B one side has pipeline three through the clamp connection, pipeline three is last to be connected with compressor tonifying qi through the pipe hoop and increases cold valve.
By adopting the technical scheme, gas can be supplemented for the circulation process in time, and the stability of the working cycle of the device is ensured.
Furthermore, a second pipeline is arranged on one side of the first pipeline, one end of the second pipeline is connected with the heat exchanger through a pipe hoop, and the second pipeline is connected with an electromagnetic two-way valve through the pipe hoop.
By adopting the technical scheme, the electromagnetic two-way valve can control the circulation states of the second pipeline and the third pipeline and can flexibly switch, so that two working modes of low-temperature circulation and high-temperature circulation of the device are realized, the functionality is good, and the using effect of the device is enhanced.
Furthermore, the third pipeline is connected with the second pipeline through a pipe hoop, and the other end of the second pipeline is connected with the first pipeline through a pipe hoop.
By adopting the technical scheme, the device can be ensured to work stably in a circulating way.
Furthermore, one side of the pipeline is connected with a liquid storage tank through a pipe hoop.
Through adopting above-mentioned technical scheme, can save liquid, provide the water source for the device.
Furthermore, one side of the liquid storage tank is connected with a pipeline IV through a pipe hoop.
By adopting the technical scheme, all working devices can be communicated, and the working stability of the device is ensured.
Furthermore, a main expansion valve is connected to the fourth pipeline through a hoop.
By adopting the technical scheme, the medium-temperature high-pressure liquid refrigerant can be throttled into low-temperature low-pressure wet steam.
Furthermore, an evaporator is connected to one side of the fourth pipeline, which is close to the main expansion valve, through a pipe hoop.
By adopting the technical scheme, the refrigerant can absorb heat in the evaporator to achieve the refrigeration effect, and simultaneously the refrigerant and the main expansion valve work together to control the flow of the valve.
Furthermore, the pipeline four is connected with the gas-liquid separator through a clamping groove.
By adopting the technical scheme, a circulating channel can be formed, and the working stability of the device is ensured.
The specific working principle is as follows: when the device is used, the liquid storage tank stores liquid, so that the device can circularly heat, the heat exchanger exchanges heat, the water side heat exchange section preheats water, the heating efficiency of the steam generator can be improved, the energy consumption is low, the energy saving performance of the device is improved, the refrigerant side heat exchange section can refrigerate, low-pressure refrigerant gas is lifted to high-pressure refrigerant gas through the compressor, thereby the cycle process of compression-heat release-expansion-evaporation is realized, the working efficiency of the device is improved, the sufficient heat supply of water vapor is ensured, the gas-liquid separation is realized through the gas-liquid separator, the medium-temperature high-pressure liquid refrigerant can be throttled by the main expansion valve to become low-temperature low-pressure wet steam, the refrigerant absorbs heat in the evaporator to achieve the refrigeration effect, and simultaneously, the liquid storage tank works together with the main expansion valve to control the flow of the valve, the electromagnetic two-way valve can switch a high-temperature circulation working mode and a low-temperature circulation working mode according to use requirements, so that the function effect of the device is improved, in the high-temperature circulation working mode, gas and liquid are separated through the gas-liquid separator, then the gas and liquid are conveyed to the joint C of the compressor through the pipeline four, then the gas and liquid flow out of the joint A, the gas and liquid are conveyed into the heat exchanger through the pipeline five, then the gas and liquid are conveyed into the secondary reverse evaporator through the pipeline one, then the gas and liquid are conveyed into the liquid storage tank for storage, and water vapor sequentially flows through the main expansion valve and the evaporator through the pipeline four, so that the high-temperature circulation of the device is realized, in the low-temperature circulation working mode, gaseous refrigerant enters the gas-liquid separator for separation, and then is conveyed to the joint C of the compressor through the pipeline four, then the gas flows out through the joint A, is conveyed into the heat exchanger through the pipeline five, and is conveyed to the gas and cold supplementing valve of the compressor through the pipeline two and the pipeline three, so that gas can be supplemented in the circulation process, the working circulation of the device is ensured to be stable, and then is conveyed into the compressor through the joint B through the pipeline three, and the low-temperature circulation of the device is realized.
The invention has the beneficial effects that:
1. by arranging the heat exchanger, the gas-liquid separator, the compressor and the secondary reverse evaporator, the heat supply efficiency of the device can be improved, the sufficient heat supply of water vapor is ensured, and the use effect of the device is improved;
2. by arranging the second pipeline, the third pipeline, the electromagnetic two-way valve and the compressor air supply and cold increase valve, the device can have two working modes of low-temperature circulation and high-temperature circulation, the working modes can be flexibly switched, the functionality is good, and the using effect of the device is improved;
3. through setting up water side heat transfer section, can preheat water, improve steam generator's heating efficiency, lower energy consumption improves the energy-conservation nature of device.
Drawings
FIG. 1 is a front view of a high temperature heat pump steam generator according to the present invention;
fig. 2 is a front view of a compressor in a high temperature heat pump steam generator according to the present invention.
The reference numerals are explained below:
1. a heat exchanger; 101. a water side heat exchange section; 102. a refrigerant side heat exchange section; 2. a first pipeline; 3. a secondary reverse evaporator; 4. a second pipeline; 5. an electromagnetic two-way valve; 6. a third pipeline; 7. a compressor air supply cold increase valve; 8. a compressor; 9. a joint A; 10. a joint B; 11. a linker C; 12. a gas-liquid separator; 13. a fourth pipeline; 14. an evaporator; 15. a main expansion valve; 16. a liquid storage tank; 17. and a fifth pipeline.
Detailed Description
The invention will be further described with reference to the accompanying drawings in which:
as shown in fig. 1-2, a high temperature heat pump steam generator includes a heat exchanger 1, a compressor 8 and a gas-liquid separator 12, wherein one side of the upper end of the heat exchanger 1 is connected with a first pipe 2 through a clamp, the first pipe 2 is connected with a second-stage reverse evaporator 3 through a pipe clamp, one side of the heat exchanger 1 is provided with the compressor 8, one side wall of the compressor 8 is connected with a joint a9 through a screw thread, a pipe fifth 17 is connected between the joint a9 and the heat exchanger 1 through a clamp, the upper end of the compressor 8 is connected with a joint B10 through a screw thread, the other side wall of the compressor 8 is connected with a joint C11 through a screw thread, one side of the compressor 8 far away from the heat exchanger 1 is provided with the gas-liquid separator 12, the heat exchanger 1 includes a water-side heat exchange section 101 and a refrigerant-side heat exchange section 102 on one side of the water-side heat exchange section 101, the heat exchanger 1 can exchange heat with water, the water is preheated through the water side heat exchange section 101, the heating efficiency of the steam generator can be improved, the energy consumption is low, the energy saving performance of the device is improved, the refrigerant side heat exchange section 102 can refrigerate, low-pressure refrigerant gas is lifted to high-pressure refrigerant gas through the compressor 8, the cycle process of compression, heat release, expansion and evaporation is realized, the working efficiency of the device is improved, sufficient heat supply of water vapor is guaranteed, gas-liquid separation is realized through the gas-liquid separator 12, the secondary reverse evaporator 3 can perform secondary heat absorption on the refrigerant, the refrigerating effect is improved, and therefore the water and the high-temperature section of the refrigerant exchange heat to output the water vapor to be used by users.
In this embodiment, there is pipeline three 6 on joint B10 one side through the clamp connection, be connected with compressor tonifying qi through the pipe hoop on pipeline three 6 and increase cold valve 7, can be in time for circulation process make-up gas, ensure that device duty cycle is stable.
In this embodiment, a second pipeline 4 is arranged on one side of the first pipeline 2, one end of the second pipeline 4 is connected with the heat exchanger 1 through a pipe hoop, the second pipeline 4 is connected with an electromagnetic two-way valve 5 through the pipe hoop, and the electromagnetic two-way valve 5 can control the circulation states of the second pipeline 4 and the third pipeline 6 and can be flexibly switched, so that two working modes of low-temperature circulation and high-temperature circulation of the device are realized, the functionality is good, and the using effect of the device is enhanced.
In this embodiment, the third pipe 6 is connected to the second pipe 4 through a pipe clamp, and the other end of the second pipe 4 is connected to the first pipe 2 through a pipe clamp, so that the cycle operation stability of the device can be ensured.
In this embodiment, one side of the first pipeline 2 is connected with a liquid storage tank 16 through a pipe hoop, which can store liquid and provide water source for the device.
In this embodiment, one side of the liquid storage tank 16 is connected with a pipeline four 13 through a pipe hoop, which can communicate with each working device to ensure the stable operation of the device.
In this embodiment, the fourth pipe 13 is connected to a main expansion valve 15 through a clamp, so that the medium-temperature and high-pressure liquid refrigerant can be throttled into low-temperature and low-pressure wet steam.
In this embodiment, an evaporator 14 is connected to one side of the fourth pipe 13, which is close to the main expansion valve 15, through a pipe clamp, so that a refrigerant can absorb heat in the evaporator 14 to achieve a refrigeration effect, and simultaneously, the refrigerant and the main expansion valve 15 work together to control the flow rate of the valve.
In this embodiment, the fourth pipe 13 is connected to the gas-liquid separator 12 through a clamping groove, so that a circulation channel can be formed, and the stable operation of the device is ensured.
The specific working principle is as follows: when the device is used, the liquid is stored in the liquid storage tank 16, so that the device can circularly heat, heat exchange is carried out through the heat exchanger 1, water is preheated through the water side heat exchange section 101, the heating efficiency of the steam generator can be improved, the energy consumption is low, the energy saving performance of the device is improved, the refrigerant side heat exchange section 102 can carry out refrigeration, low-pressure refrigerant gas is lifted to high-pressure refrigerant gas through the compressor 8, thereby the cycle process of compression-heat release-expansion-evaporation is realized, the working efficiency of the device is improved, the sufficient heat supply of water vapor is ensured, the gas-liquid separator 12 realizes gas-liquid separation, the medium-temperature high-pressure liquid refrigerant can be throttled by the main expansion valve 15 to become low-temperature low-pressure wet steam, and the refrigerant absorbs heat in the evaporator 14 to achieve the refrigeration effect, meanwhile, the electromagnetic two-way valve 5 works together with the main expansion valve 15 to control the valve flow, a high-temperature circulation working mode and a low-temperature circulation working mode can be switched according to use requirements, the function effect of the device is improved, in the high-temperature circulation working mode, gas and liquid are separated through the gas-liquid separator 12, then are conveyed to the joint C11 of the compressor 8 through the pipeline four 13, then flow out through the joint A9, are conveyed into the heat exchanger 1 through the pipeline five 17, then are conveyed into the secondary reverse evaporator 3 through the pipeline one 2, and then are conveyed into the liquid storage tank 16 for storage, and water vapor sequentially flows through the main expansion valve 15 and the evaporator 14 through the pipeline four 13, so that the high-temperature circulation of the device is realized, the gaseous refrigerant enters the gas-liquid separator 12 for separation, and is then conveyed to the joint C11 of the compressor 8 through the pipeline four 13, and then flows out through the joint A9, and is conveyed into the heat exchanger 1 through the pipeline five 17, and is further conveyed to the compressor air supplementing and cold increasing valve 7 through the pipeline two 4 and the pipeline three 6, so that the gas can be supplemented for the circulation process, the working cycle of the device is ensured to be stable, and then is conveyed into the compressor 8 through the joint B10 through the pipeline three 6, and the low-temperature circulation of the device is realized.
The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed.
Claims (10)
1. A high temperature heat pump steam generator characterized by: including heat exchanger (1), compressor (8) and vapour and liquid separator (12), there is pipeline (2) heat exchanger (1) upper end one side through the clamp connection, be connected with secondary anti-evaporimeter (3) through the pipe hoop on pipeline (2), heat exchanger (1) one side is provided with compressor (8), there is joint A (9) through threaded connection on a compressor (8) lateral wall, joint A (9) with there is five (17) of pipeline through the clamp connection between heat exchanger (1), there is joint B (10) compressor (8) upper end through threaded connection, there is joint C (11) through threaded connection on another lateral wall of compressor (8), keep away from compressor (8) heat exchanger (1) one side is provided with vapour and liquid separator (12).
2. A high temperature heat pump steam generator according to claim 1, wherein: the heat exchanger (1) comprises a water side heat exchange section (101) and a refrigerant side heat exchange section (102) at one side of the water side heat exchange section (101).
3. A high temperature heat pump steam generator according to claim 1, wherein: connect B (10) one side and have pipeline three (6) through the clamp connection, be connected with compressor tonifying qi and increasing cold valve (7) through the ferrule on pipeline three (6).
4. A high temperature heat pump steam generator according to claim 3, wherein: and a second pipeline (4) is arranged on one side of the first pipeline (2), one end of the second pipeline (4) is connected with the heat exchanger (1) through a pipe hoop, and the second pipeline (4) is connected with an electromagnetic two-way valve (5) through the pipe hoop.
5. A high temperature heat pump steam generator according to claim 4, wherein: the pipeline III (6) is connected with the pipeline II (4) through a pipe hoop, and the other end of the pipeline II (4) is connected with the pipeline I (2) through a pipe hoop.
6. A high temperature heat pump steam generator according to claim 1, wherein: one side of the first pipeline (2) is connected with a liquid storage tank (16) through a pipe hoop.
7. A high temperature heat pump steam generator according to claim 6, wherein: and a pipeline IV (13) is connected to one side of the liquid storage tank (16) through a pipe hoop.
8. A high temperature heat pump steam generator according to claim 7, wherein: and the pipeline four (13) is connected with a main expansion valve (15) through a hoop.
9. A high temperature heat pump steam generator according to claim 8, wherein: and one side of the pipeline four (13) close to the main expansion valve (15) is connected with an evaporator (14) through a pipe hoop.
10. A high temperature heat pump steam generator according to claim 7, wherein: the fourth pipeline (13) is connected with the gas-liquid separator (12) through a clamping groove.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010629047.XA CN113883487A (en) | 2020-07-01 | 2020-07-01 | High-temperature heat pump steam generator |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010629047.XA CN113883487A (en) | 2020-07-01 | 2020-07-01 | High-temperature heat pump steam generator |
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| CN113883487A true CN113883487A (en) | 2022-01-04 |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201866928U (en) * | 2010-11-03 | 2011-06-15 | 湖南利能科技股份有限公司 | Quasi-two stage compression ultralow temperature air source heat pump water heater with economizer |
| CN102434995A (en) * | 2011-12-19 | 2012-05-02 | 无锡同方人工环境有限公司 | R32 air-cooling cold water heat pump unit adopting EVI (Economizer Vapor Injection) compressor |
| CN107883606A (en) * | 2017-12-12 | 2018-04-06 | 南京天加环境科技有限公司 | A kind of efficient heat source tower heat pump |
| CN109579363A (en) * | 2019-01-04 | 2019-04-05 | 任丘市宏旺采暖设备有限公司 | Heat pump unit with solar energy-air source direct-expansion type evaporator |
| CN208967906U (en) * | 2018-07-25 | 2019-06-11 | 中国科学院广州能源研究所 | A kind of double evaporators air energy high temperature thermal pump water heater group |
| CN209386606U (en) * | 2019-01-04 | 2019-09-13 | 任丘市宏旺采暖设备有限公司 | Heat pump unit with solar energy-air source direct-expansion type evaporator |
-
2020
- 2020-07-01 CN CN202010629047.XA patent/CN113883487A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201866928U (en) * | 2010-11-03 | 2011-06-15 | 湖南利能科技股份有限公司 | Quasi-two stage compression ultralow temperature air source heat pump water heater with economizer |
| CN102434995A (en) * | 2011-12-19 | 2012-05-02 | 无锡同方人工环境有限公司 | R32 air-cooling cold water heat pump unit adopting EVI (Economizer Vapor Injection) compressor |
| CN107883606A (en) * | 2017-12-12 | 2018-04-06 | 南京天加环境科技有限公司 | A kind of efficient heat source tower heat pump |
| CN208967906U (en) * | 2018-07-25 | 2019-06-11 | 中国科学院广州能源研究所 | A kind of double evaporators air energy high temperature thermal pump water heater group |
| CN109579363A (en) * | 2019-01-04 | 2019-04-05 | 任丘市宏旺采暖设备有限公司 | Heat pump unit with solar energy-air source direct-expansion type evaporator |
| CN209386606U (en) * | 2019-01-04 | 2019-09-13 | 任丘市宏旺采暖设备有限公司 | Heat pump unit with solar energy-air source direct-expansion type evaporator |
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Application publication date: 20220104 |