CN108759142A - A kind of special overlapping air source high-temperature heat pump cooling/warming system - Google Patents
A kind of special overlapping air source high-temperature heat pump cooling/warming system Download PDFInfo
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- CN108759142A CN108759142A CN201810711004.9A CN201810711004A CN108759142A CN 108759142 A CN108759142 A CN 108759142A CN 201810711004 A CN201810711004 A CN 201810711004A CN 108759142 A CN108759142 A CN 108759142A
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- 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
- F25B13/00—Compression machines, plants or systems, with reversible cycle
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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
- F25B2500/00—Problems to be solved
- F25B2500/31—Low ambient temperatures
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- 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
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/52—Heat recovery pumps, i.e. heat pump based systems or units able to transfer the thermal energy from one area of the premises or part of the facilities to a different one, improving the overall efficiency
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Devices That Are Associated With Refrigeration Equipment (AREA)
- Other Air-Conditioning Systems (AREA)
Abstract
The present invention relates to a kind of air source heat pump cooling/warming system more particularly to a kind of special overlapping air source high-temperature heat pump cooling/warming systems.The technical solution adopted by the present invention is：A kind of cascade superhigh temperature hot water air source heat pump system, including heating system and refrigeration system, heating system includes high temperature modular refrigeration agent system and refrigerated module refrigerant system, high temperature modular refrigeration agent system includes compressor I, condenser I, recycling fluid reservoir I and Economy of Intermediate Form device A, refrigerated module refrigerant system includes compressor II, Economy of Intermediate Form device A, evaporator II, evaporation fan, refrigeration system is single module autonomous working operation comprising compressor II, evaporator II, heating power expansion valve II, refrigerated heat exchanger II.It is an advantage of the invention that：Reliable for operation under low ambient temperature, winter can produce 80 DEG C or more hot water, and summer produces 8 DEG C of cold water below, may be simultaneously used for cooling in summer, really realize that dual-use, economy are high.
Description
Technical field
The present invention relates to a kind of air source heat pump cooling/warming system more particularly to a kind of special overlapping air source high warms
Pump cooling/warming system.
Background technology
Traditional overlapping air source heat pump is mainly used for northern low temperature heating, and because unit cannot freeze, cooling in summer needs
Another installation air conditioner refrigerating causes user to need to install 2 kinds of type heat pumps and air-conditioning in this way, this just to cause economy to user
Difference, it is inconvenient to use.Therefore, it should a kind of new technical solution be provided and solved the above problems.
Invention content
In view of the deficiencies of the prior art, the present invention is intended to provide a kind of can be in the superposition type of Effec-tive Function under ultra-low temperature surroundings
Air source high-temperature heat pump cooling/warming system.
To achieve the above object, ensure that cascade type heat pump cooling/warming system is reliable for operation under low ambient temperature, winter produces 80
DEG C or more hot water, summer produce 8 DEG C of cold water below, really realize dual-use, the present invention adopts the following technical scheme that：
A kind of cascade superhigh temperature hot water air source heat pump system, including heating system and refrigeration system, the heating system
System includes high temperature modular refrigeration agent system and refrigerated module refrigerant system,
The high temperature modular refrigeration agent system includes compressor I, condenser I, recycling fluid reservoir I and Economy of Intermediate Form device A, institute
The outlet for stating compressor I is connect with the entrance of condenser I, and the centre of the outlet of the compressor I connection condenser I is provided with high pressure
The outlet of switch I, the condenser I is connect with the entrance of recycling fluid reservoir I, and the outlet of the recycling fluid reservoir I and heating power are swollen
The entrance of swollen valve I connects, and two-port valve I, the heating power expansion valve I and Economy of Intermediate Form have been arranged in parallel on the heating power expansion valve I
Device A connections, the entrance of the outlet connection separator I of the Economy of Intermediate Form device A, the export pressure contracting machine I of separator I, described point
Centre from I connect compressor I of device is provided with low tension switch I；
The refrigerated module refrigerant system includes compressor II, Economy of Intermediate Form device A, evaporator II, evaporation fan, described
The outlet of compressor II is connect with Economy of Intermediate Form device A entrances, and the outlets Economy of Intermediate Form device A are connect with fluid reservoir II, the storage
The outlet of flow container II is connect with the entrance of heating power expansion valve II, and two-port valve II, the liquid storage have been arranged in parallel on heating power expansion valve II
The outlet of tank II is also connected back to by II a of two-port valve and stores up flow container I, the entrance of the heating power expansion valve II outlet and evaporator II
Connection, the outlet of the heating power expansion valve II are also connect with the entrance of refrigerated heat exchanger II, and steaming is equipped with outside at the evaporator II
Wind turbine cycle heat exchange is sent out, the outlet of the evaporator II is connect with the entrance of separator II, the contracting of II export pressure of the separator
Machine II；
The refrigeration system is single module autonomous working operation comprising compressor II, evaporator II, heating power expansion valve
II, the entrance of refrigerated heat exchanger II, the compressor II are connect with the entrance of evaporator II, the compressor II and evaporator II
Connection is intermediate to be equipped with four-way valve II, high-voltage switch gear II, and the outlet of the evaporator II connect connection, the steaming with II entrance of fluid reservoir
The centre that hair device II is connect with fluid reservoir II is provided with II a of check valve, the outlet of the fluid reservoir II and II entrance of heating power expansion valve
Connection, the heating power expansion valve II have been arranged in parallel two-port valve II, outlet and the refrigerated heat exchanger II of the heating power expansion valve II
The outlet of entrance, the refrigerated heat exchanger II connects II entrance of separator, the connection of the refrigerated heat exchanger II and separator II
Centre is provided with II c of check valve, four-way valve II and low tension switch II, the outlet connect compressor II of the separator II.
Further technical solution is：
The recycling fluid reservoir I connect centre with heating power expansion valve I and is provided with filter I.
It is provided with high-voltage switch gear II and four-way valve II among the connection of the compressor II and Economy of Intermediate Form device A.
It is provided with filter II, the fluid reservoir II and two-way among the fluid reservoir II and the connection of heating power expansion valve II
II a of filter is provided among the connection of II a of valve.
The Economy of Intermediate Form device A and fluid reservoir II connect centre and are provided with check valve II.
The evaporator II and heating power expansion valve II, refrigerated heat exchanger II connection among be provided with II b of check valve.
The evaporator II and the intermediate connections of separator II are provided with four-way valve II.
Due to the adoption of the above technical solution, the present invention has the following advantages that compared with prior art：
Overlapping air source high-temperature heat pump cooling/warming system of the present invention, reliable for operation under low ambient temperature, winter can produce
80 DEG C or more hot water, summer produce 8 DEG C of cold water below, may be simultaneously used for cooling in summer, really realize dual-use, warp
Ji property is high.
Description of the drawings
Attached drawing 1 is the system diagram of overlapping air source high-temperature heat pump cooling/warming system of the present invention.
In the figures above：1, compressor I, 2, condenser I, 3, recycling fluid reservoir I, 4, Economy of Intermediate Form device A, 5, high-voltage switch gear
I, 6, heating power expansion valve I, 7, filter I, 8, two-port valve I, 9, separator I, 10, low tension switch I, 11, compressor II, 12, steam
Send out device II, 13, evaporation fan, 14, high-voltage switch gear II, 15, four-way valve II, 16, fluid reservoir II, 17, check valve II, 18, heating power
Expansion valve II, 19, two-port valve II a, 20, refrigerated heat exchanger II, 21, two-port valve II, 22, check valve II a, 23, II b of check valve,
24, low tension switch II, 25, separator II, 26, check valve II c, 27, filter II, 28, II a of filter.
Specific implementation mode
The invention will be further described with reference to the accompanying drawings and embodiments：
As shown in Figure 1, one embodiment as the present invention,；
A kind of cascade superhigh temperature hot water air source heat pump system, including heating system and refrigeration system, the heating system
System includes high temperature modular refrigeration agent system and refrigerated module refrigerant system,
1, the high temperature modular refrigeration agent system includes compressor I 1, condenser I 2, recycling fluid reservoir I 3 and Economy of Intermediate Form
The outlet of device A4, the compressor I 1 are connect with the entrance of condenser I 2, in the outlet of the compressor I 1 connection condenser I 2
Between be provided with high-voltage switch gear I 5, for system high pressure protect, the condenser I 2 outlet with recycling fluid reservoir I 3 entrance connect
It connects, the recovery waste heat of recycling fluid reservoir I 3 mainly gives low-temperature level compressor and provides evaporation heat in increasing enthalpy.The recycling storage
The outlet of flow container I 3 is connect with the entrance of heating power expansion valve I 6, has been arranged in parallel two-port valve I 8 on the heating power expansion valve I 6, and two
Port valve I 8 is mainly used for balancing the degree of superheat, and the heating power expansion valve I 6 is connect with Economy of Intermediate Form device A4, the Economy of Intermediate Form device A4
Outlet connection separator I 9 entrance, the export pressure contracting machine I 1 of separator I 9, I 9 connect compressor I 1 of the separator
Centre is provided with low tension switch I 10, is protected for system low-voltage；
The refrigerated module refrigerant system includes compressor II 11, Economy of Intermediate Form device A4, evaporator II 12, evaporation fan
13, the outlet of the compressor II 11 is connect with Economy of Intermediate Form device A4 entrances, the outlets Economy of Intermediate Form device A4 and fluid reservoir II
16 connections, the outlet of the fluid reservoir II 16 connect with the entrance of heating power expansion valve II 18, are arranged in parallel on heating power expansion valve II 18
There is two-port valve II 21, is mainly used for balance overheat aperture, the outlet of the fluid reservoir II 16 also passes through II a19 connections of two-port valve
Recycle fluid reservoir I 3, the heating power expansion valve
II 18 outlets are connect with the entrance of evaporator II 12, and the outlet of the heating power expansion valve II 18 is also and refrigerated heat exchanger
II 20 entrance connects, and 13 cycle heat exchange of evaporation fan, the outlet of the evaporator II 12 are equipped with outside at the evaporator II 12
It is connect with the entrance of separator II 25, II 25 export pressure contracting machine II 11 of the separator；
The refrigeration system is single module autonomous working operation comprising compressor II 11, evaporator II 12, thermal expansion
The entrance of valve II 18, refrigerated heat exchanger II 20, the compressor II 11 is connect with the entrance of evaporator II 12, the compressor II
11, which connect centre with evaporator II 12, is equipped with four-way valve II 15, high-voltage switch gear II 14, the outlet of the evaporator II 12 and fluid reservoir
The connection connection of II 16 entrances, the centre that the evaporator II 12 is connect with fluid reservoir II 16 is provided with II a22 of check valve, the storage
The outlet of flow container II 16 is connect with II 18 entrance of heating power expansion valve, and the heating power expansion valve II 18 has been arranged in parallel two-port valve II 21,
The outlet of the heating power expansion valve II 18 and II 20 entrance of refrigerated heat exchanger, the outlet connection point of the refrigerated heat exchanger II 20
From II 25 entrance of device, II c26 of check valve, four-way valve are provided among the refrigerated heat exchanger II 20 and the connection of separator II 25
II 15 and low tension switch II 24, the outlet connect compressor II 11 of the separator II 25.
Preferably, second embodiment as the present invention, the present embodiment is being further improved to embodiment one, described
Recycling fluid reservoir I 3 connect centre with heating power expansion valve I and is provided with filter I, the connection of compressor II 11 and Economy of Intermediate Form device A4
Centre is provided with high-voltage switch gear II 14 and four-way valve II 15, is used for system protection and defrosting.
Preferably, the third embodiment as the present invention, the present embodiment is also being further improved to embodiment one, institute
It states and is provided with filter II 27, the fluid reservoir II 16 and two-port valve among fluid reservoir II 16 and the connection of heating power expansion valve II 18
II a28 of filter is provided among the connection of II a19.
Preferably, the 4th embodiment as the present invention, the present embodiment is also being further improved to embodiment three, institute
It states and is provided with check valve II 17, the evaporator II 12 and heating power expansion valve among Economy of Intermediate Form device A4 and the connection of fluid reservoir II 16
II 18, be provided with II b23 of check valve among the connection of refrigerated heat exchanger II 20, the evaporator II 12 in separator II 25
Between junction be provided with four-way valve II 15.
The advantages of overlapping air source high-temperature heat pump cooling/warming system of the present invention and operation principle are as follows：
The present invention is suitable for the overlapping air source heat pump cold and warm system of ultra-low temperature surroundings, and evaporative condenser is both low temperature
System condenser is high-temperature systems evaporator again, and refrigerant absorbs heat in cryogenic system evaporator in cryogenic system, and
Equality of temperature is become with the gas of pressure by the gas-liquid mixed state of low-temp low-pressure by cryogenic system gas-liquid separator, gaseous refrigerant is low
Entrance can be as the evaporative condenser of cryogenic system condenser after being compressed into the gas of high temperature and pressure in warm system compressors
In release heat, at the same time the refrigerant in high-temperature systems by heat from the evaporation of high-temperature systems evaporator can be used as cold
It is brought into high-temperature systems water condenser and with heat via high-temperature systems gas-liquid separator and high-temperature systems compressor respectively in condenser
The mode of exchange transfers heat to water, and to obtain the high-temperature-hot-water of required temperature, having can be under ultra-low temperature surroundings efficiently
The characteristics of operation.
Under cooling in summer operating mode, high-temperature level heat pump unit is out of service, high-temperature level compressor, high-temperature level condenser, high temperature
Grade throttle valve, high-temperature level evaporator do not work, and low-temperature level heat pump unit carries out refrigeration fortune in a manner of normal air source heat pump system
Row, and cycle fluid flow direction is changed by four-way switching valve, low-temperature level condenser and low-temperature level evaporator function are exchanged at this time.It is empty
Gas carries out heat exchange at low-temperature level evaporator with low-temperature level heat pump unit, and low-temperature level evaporator discharges heat into air, low
Warm grade heat pump unit condensed in low-temperature level evaporator by cycle fluid, compressed at low-temperature level compressor again,
Gas-liquid separation is carried out at gas-liquid separator, is evaporated in low-temperature level condenser, throttling is carried out at low-temperature level throttle valve waited
Journey carries out heat exchange at low-temperature level condenser with load cycle circuit, the heat in absorbing load circulation loop, repeatedly
Refrigeration work is realized in circular flow.
The above is the preferred embodiment of the present invention, it is noted that for those skilled in the art
For, without departing from the principles of the present invention, it can also make several improvements or replace, these improve or replace
It should be regarded as protection scope of the present invention.
Claims (7)
1. a kind of cascade superhigh temperature hot water air source heat pump system, it is characterised in that：Including heating system and refrigeration system, institute
It includes high temperature modular refrigeration agent system and refrigerated module refrigerant system to state heating system,
The high temperature modular refrigeration agent system includes compressor I (1), condenser I (2), recycling fluid reservoir I (3) and Economy of Intermediate Form
The outlet of device A (4), the compressor I (1) are connect with the entrance of condenser I (2), the compressor I (1) outlet connection condensation
The centre of device I (2) is provided with high-voltage switch gear I (5), and the outlet of the condenser I (2) connects with the entrance of recycling fluid reservoir I (3)
It connects, the outlet of the recycling fluid reservoir I (3) is connect with the entrance of heating power expansion valve I (6), on the heating power expansion valve I (6) simultaneously
Connection is provided with two-port valve I (8), and the heating power expansion valve I (6) is connect with Economy of Intermediate Form device A (4), the Economy of Intermediate Form device A (4)
Outlet connection separator I (9) entrance, the export pressure contracting machine I (1) of separator I (9), the separator I (9) connection presses
The centre of contracting machine I (1) is provided with low tension switch I (10)；
The refrigerated module refrigerant system includes compressor II (11), Economy of Intermediate Form device A (4), evaporator II (12), evaporation wind
The outlet of machine (13), the compressor II (11) is connect with Economy of Intermediate Form device A (4) entrance, Economy of Intermediate Form device A (4) outlet
It is connect with fluid reservoir II (16), the fluid reservoir II (16) outlet is connect with the entrance of heating power expansion valve II (18), thermal expansion
Two-port valve II (21) is arranged in parallel on valve II (18), the outlet of the fluid reservoir II (16) is also connected by II a of two-port valve (19)
It takes back and stores up flow container I (3), the heating power expansion valve II (18) outlet is connect with the entrance of evaporator II (12), and the heating power is swollen
The outlet of swollen valve II (18) is also connect with the entrance of refrigerated heat exchanger II (20), and evaporation wind is equipped with outside at the evaporator II (12)
Machine (13) cycle heat exchange, the outlet of the evaporator II (12) are connect with the entrance of separator II (25), the separator II
(25) export pressure contracting machine II (11)；
The refrigeration system is single module autonomous working operation comprising compressor II (11), evaporator II (12), thermal expansion
The entrance of valve II (18), refrigerated heat exchanger II (20), the compressor II (11) is connect with the entrance of evaporator II (12), described
Compressor II (11) connect intermediate equipped with four-way valve II (15), high-voltage switch gear II (14), the evaporator with evaporator II (12)
II (12) outlet connect connection, the centre that the evaporator II (12) is connect with fluid reservoir II (16) with fluid reservoir II (16) entrance
It is provided with II a of check valve (22), the fluid reservoir II (16) outlet is connect with heating power expansion valve II (18) entrance, and the heating power is swollen
Swollen valve II (18) has been arranged in parallel two-port valve II (21), outlet and the refrigerated heat exchanger II (20) of the heating power expansion valve II (18)
Entrance, the outlet of the refrigerated heat exchanger II (20) connect separator II (25) entrance, the refrigerated heat exchanger II (20) with point
II c of check valve (26), four-way valve II (15) and low tension switch II (24), the separation are provided among connection from device II (25)
The outlet connect compressor II (11) of device II (25).
2. a kind of cascade superhigh temperature hot water air source heat pump system according to claim 1, it is characterised in that：Described time
It stores up flow container I (3) and is connect with heating power expansion valve I (6) and intermediate be provided with filter I (7).
3. a kind of cascade superhigh temperature hot water air source heat pump system according to claim 1, it is characterised in that：The pressure
It is provided with high-voltage switch gear II (14) and four-way valve II (15) among contracting machine II (11) and the connection of Economy of Intermediate Form device A (4).
4. a kind of cascade superhigh temperature hot water air source heat pump system according to claim 1, it is characterised in that：The storage
It is provided with filter II (27), the fluid reservoir II (16) and two among flow container II (16) and the connection of heating power expansion valve II (18)
II a of filter (28) is provided among the connection of II a of port valve (19).
5. a kind of cascade superhigh temperature hot water air source heat pump system according to claim 1, it is characterised in that：In described
Between economizer A (4) connect with fluid reservoir II (16) and intermediate be provided with check valve II (17).
6. a kind of cascade superhigh temperature hot water air source heat pump system according to claim 1, it is characterised in that：The steaming
Hair device II (12) with heating power expansion valve II (18), refrigerated heat exchanger II (20) connection among be provided with II b of check valve (23).
7. a kind of cascade superhigh temperature hot water air source heat pump system according to claim 1, it is characterised in that：The steaming
Hair device II (12) and the intermediate connections of separator II (25) are provided with four-way valve II (15).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810711004.9A CN108759142B (en) | 2018-07-02 | 2018-07-02 | Special cascade air source high-temperature heat pump cooling and heating system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810711004.9A CN108759142B (en) | 2018-07-02 | 2018-07-02 | Special cascade air source high-temperature heat pump cooling and heating system |
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| Publication Number | Publication Date |
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| CN108759142A true CN108759142A (en) | 2018-11-06 |
| CN108759142B CN108759142B (en) | 2023-04-25 |
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| CN201810711004.9A Active CN108759142B (en) | 2018-07-02 | 2018-07-02 | Special cascade air source high-temperature heat pump cooling and heating system |
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Cited By (6)
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| CN110073983A (en) * | 2019-03-01 | 2019-08-02 | 青岛沃润达新能源科技有限公司 | The meat chicken cultivation humidity control system and its control method constituted based on air-heater |
| CN110220322A (en) * | 2019-06-06 | 2019-09-10 | 无锡溥汇机械科技有限公司 | Energy saving ultralow temperature precision temperature control heat-exchange system |
| CN110762791A (en) * | 2019-10-18 | 2020-02-07 | Tcl空调器(中山)有限公司 | Air conditioner outlet air temperature control method and system and storage medium |
| CN111197874A (en) * | 2020-02-28 | 2020-05-26 | 克莱门特捷联制冷设备(上海)有限公司 | Cascade type air conditioner heat pump system and control method thereof |
| CN111750525A (en) * | 2020-05-28 | 2020-10-09 | 河南省中能联建地热工程有限公司 | Double-source hot water unit based on air source and water source double heat sources |
| CN112402995A (en) * | 2019-08-21 | 2021-02-26 | 西安东方能源工程有限公司 | Air source multiple-effect vacuum evaporation system applied to cutting fluid concentration |
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| CN110762791A (en) * | 2019-10-18 | 2020-02-07 | Tcl空调器(中山)有限公司 | Air conditioner outlet air temperature control method and system and storage medium |
| CN111197874A (en) * | 2020-02-28 | 2020-05-26 | 克莱门特捷联制冷设备(上海)有限公司 | Cascade type air conditioner heat pump system and control method thereof |
| CN111750525A (en) * | 2020-05-28 | 2020-10-09 | 河南省中能联建地热工程有限公司 | Double-source hot water unit based on air source and water source double heat sources |
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