CN109813005A - A kind of Two-stage Heat Pump System and its control method - Google Patents
A kind of Two-stage Heat Pump System and its control method Download PDFInfo
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Abstract
The invention discloses a kind of Two-stage Heat Pump System and its control methods, including the first, second, third and fourth circulation loop；First circulation circuit includes the primary evaporator being connected by circulation, primary compressor, primary condenser and primary throttle part；Second circulation circuit includes the primary condenser being connected by circulation, surge tank, secondary condenser and secondary evaporator primary condenser, is connected with system circulation pump and expansion drum in turn on third pipeline；Switching valve is connected between first pipe and second pipe；Third circulation loop includes the secondary evaporator being connected by circulation, secondary compressor, secondary condenser and secondary throttle part；4th circulation loop includes the secondary condenser being connected by circulation, heating terminal water supply pipe, the import of user heating side, the outlet of user heating side and user end water return pipeline；End water circulating pump is connected on the water return pipeline of user end.Operational efficiency of the present invention is high, can meet harsh climate use, and can provide 70 DEG C of heating water.
Description
Technical field
The present invention relates to heat pump heating field, in particular to a kind of Two-stage Heat Pump System and its control method.
Background technique
Heat pump is a kind of device of the heat energy transfer by low level heat energy to high-order heat source, air source heat pump currently on the market
Product is primarily present following problems: 1, heat capacity sharply declines under the conditions of severe cold environment, or even can not provide heat supply；2, multiple
Folded system heat pump cannot achieve refrigerating function, and comprehensive energy efficiency is lower.
Summary of the invention
The purpose of the embodiment of the present invention is that in view of the above-mentioned defects in the prior art, providing a kind of comprehensive operation efficiency high pair
Grade heat pump system and its control method,
To achieve the goals above the technical solution adopted by the present invention is that:
A kind of Two-stage Heat Pump System, including first circulation circuit, second circulation circuit, third circulation loop, the 4th circulation
Circuit and primary evaporator；
The primary evaporator connects primary compressor, and the primary compressor connects the first passage of primary condenser,
The first passage of the primary condenser connects primary throttle part, and the primary throttle part connects the primary evaporator,
Form first circulation circuit；
The second channel outlet connection surge tank of the primary condenser, the surge tank is connected secondary by first pipe
The first passage outlet of the first passage import of condenser, the secondary condenser connects secondary evaporator by second pipe
The first passage outlet of first passage, the secondary evaporator connects the second channel of the primary condenser by third pipeline
Import forms second circulation circuit；It is connected with system circulation pump P2 and expansion drum on the third pipeline in turn；The surge tank
Outlet be equipped with triple valve or connection two switching valves, between the surge tank and first pipe be equipped with the triple valve, it is described
Triple valve connects second pipe；The first switching valve, the switching valve connection are connected between the first pipe and second pipe
The second switching valve is connected on the pipeline of the secondary condenser；
The second channel outlet of the secondary evaporator is led to by second that secondary compressor connects the secondary condenser
Road import, the second channel outlet of the secondary condenser are led to by second that secondary throttle part connects the secondary evaporator
Road import forms third circulation loop；
The third channel outlet connection heating terminal water supply pipe of the secondary condenser, the heating terminal water supply pipe
The import of user heating side is connected, the outlet of the user heating side connects the secondary condensation by user end water return pipeline
The third channel import of device forms the 4th circulation loop；End water circulating pump is connected on the water return pipeline of the user end.
Electric heater is equipped in the surge tank.
The secondary condenser threeway guidance tape changes or double plate tube shell and tube heat exchanger.
The first circulation circuit is for placing ultra low temperature refrigerant, the second circulation circuit and third circulation loop
For placing high temperature refrigerant.
First switching valve and the second switching valve are motor-driven valve switching valve, and the triple valve is electric T-shaped valve.
The third pipeline is equipped with the first hygrosensor；The surge tank is equipped with second temperature detector；It is described
Second pipe is equipped with third hygrosensor；The heating terminal water supply pipe is equipped with the 4th hygrosensor；The use
Family end water return pipeline is equipped with the 5th hygrosensor.
The present invention also provides a kind of control methods of above-mentioned Two-stage Heat Pump System, comprising the following steps:
Twin-stage heating condition: opening the first, second, third and fourth circulation loop, opens the first switching valve, closes second
Switching valve；The heat in air is absorbed by primary evaporator, is passed after primary compressor heats up, then through primary condenser
Pass second circulation circuit；First circulation circuit heat is transmitted to third circulation loop by secondary evaporator, passes through secondary
After compressor promotes temperature, the 4th circulation loop is transmitted to by secondary condenser, for heating to user；
Single-stage heating condition: unlatching first, second and the 4th circulation loop open the second switching valve, close the first switching
Valve absorbs the heat in air by primary evaporator, passes to the by primary condenser after primary compressor heats up
Two circulation loops；First circulation circuit heat is passed through secondary condenser as heat-conducting medium by anti-icing fluid in second circulation circuit
It is transmitted to the 4th circulation loop, for heating to user；
Defrost operating condition: closing the third and fourth circulation loop, opens the first and second circulation loops, opens the first switching
Valve closes the second switching valve, and heat transfer is to primary condenser in the antifreeze medium extraction surge tank in second circulation circuit, then passes through
Heat is sent in primary evaporator and discharged after primary compressor, is used for defrost；When storing shortage of heat in surge tank, open
Electric heater additional heat in dynamic surge tank；
Cooling condition: closing third circulation loop, unlatching first, second and the 4th circulation loop, open the second switching valve,
Close the first switching valve；The inverse operation in first circulation circuit absorbs heat and by primary evaporator in air out of user room
Heat dissipation.
Further, when the temperature of the 5th hygrosensor detection is lower than the first setting initiation value, twin-stage is opened in selection
Heating condition or single-stage heating condition；
When the temperature of the 5th hygrosensor detection is greater than or equal to the first setting stop value, stop twin-stage heating condition
Or single-stage heating condition；
Under twin-stage heating condition, when the temperature of third hygrosensor detection is lower than set temperature value (such as 15 DEG C)
When, control system suspends the work of third circulation loop；When third hygrosensor temperature value is greater than or equal to set temperature value (example
Such as 18 DEG C), control system starts third circulation loop and works normally；
When the temperature of the 5th hygrosensor detection is higher than the second setting initiation value, cooling condition is opened；When the 5th temperature
When spending the temperature of detector points less than or equal to the second setting stop value, cooling condition is closed.
Described first sets initiation value as 20-55 DEG C；Described first sets stop value as 25-60 DEG C；The set temperature
Value is 10-25 DEG C；Described second sets initiation value as 10-30 DEG C；Described second sets stop value as 7-25 DEG C.
Technical solution provided in an embodiment of the present invention has the benefit that
The double stage heat pump heating of two stages of compression is realized in invention using double-compressor, it is ensured that heat pump system is in cold environment
Under the conditions of reliably working, and very high comprehensive operation efficiency is obtained in entire Heating Season, simultaneity factor can also be used to freeze, drop
The low idleness of equipment time improves utilization rate of equipment and installations.Can also be had using anti-icing fluid as heat transfer cycle medium in system of the invention
Effect improves the resistance to frost of equipment, can meet the heating water that harsh climate uses and can provide 70 DEG C.
Detailed description of the invention
Fig. 1 is the systematic schematic diagram of Two-stage Heat Pump System provided in an embodiment of the present invention；
Fig. 2 is the twin-stage heating operation logic figure of Two-stage Heat Pump System provided in an embodiment of the present invention；
Fig. 3 is the single-stage heating operation schematic diagram of Two-stage Heat Pump System provided in an embodiment of the present invention；
Fig. 4 is the defrost operation logic figure of Two-stage Heat Pump System provided in an embodiment of the present invention；
Fig. 5 is the single-stage refrigeration operation logic figure of Two-stage Heat Pump System provided in an embodiment of the present invention.
In figure:
1 primary evaporator, 2 primary compressors, 3 primary condensers, 4 primary throttle parts, 5 surge tanks, 6 first pipes, 7
Secondary condenser, 8 second pipes, 9 grade evaporators, 10 third pipelines, 11 system circulations pump, 12 expansion drums, 13 first switchings
Valve, 14 secondary compressors, 15 grade throttle parts, 16 heating terminal water supply pipes, 17 user end water return pipelines, 18 ends are followed
Ring water pump, 19 electric heaters, 20 first hygrosensors, 21 second temperature detectors, 22 third hygrosensors, 23 the 4th temperature
Spend detector, 24 the 5th hygrosensors, 25 second switching valves, 26 triple valves.
Specific embodiment
To make the object, technical solutions and advantages of the present invention clearer, below in conjunction with attached drawing to embodiment party of the present invention
Formula is described in further detail.
Referring to Fig. 1, a kind of Two-stage Heat Pump System, including first circulation circuit, second circulation circuit, third circulation loop,
4th circulation loop and primary evaporator 1；
Primary evaporator 1 connects primary compressor 2, and primary compressor 2 connects the first passage of primary condenser 3, primary
The first passage of condenser 3 connects primary throttle part 4, and primary throttle part 4 connects primary evaporator 1, forms first circulation
Circuit；
The second channel outlet connection surge tank 5 of primary condenser 3, surge tank 5 connect secondary condensation by first pipe 6
The first passage outlet of the first passage import of device 7, secondary condenser 7 connects the first of secondary evaporator 9 by second pipe 8
Channel, the first passage outlet of secondary evaporator 9 connect the second channel import of primary condenser 3, shape by third pipeline 10
At second circulation circuit；It is connected with system circulation pump 11 and expansion drum 12 on third pipeline 10 in turn；The outlet of surge tank 5 is equipped with
Two switching valves of triple valve 26 or connection, are equipped with the triple valve 26 between surge tank 5 and first pipe 6, triple valve 26 connects
Second pipe 8；The first switching valve 13 is connected between first pipe 6 and second pipe 8, the first switching valve 13 connects secondary condensation
The second switching valve 25 is connected on the pipeline of device 7；
Secondary evaporator 9 second channel outlet by secondary compressor 14 connect secondary condenser 7 second channel into
Mouthful, the second channel outlet of secondary condenser 7 connects the second channel import of secondary evaporator 9 by secondary throttle part 15,
Form third circulation loop；
The third channel outlet connection heating terminal water supply pipe 16 of secondary condenser 7, heating terminal water supply pipe 16 connect
Connect the import of user heating side, the outlet of user heating side connects the of secondary condenser 7 by user end water return pipeline 17
Triple channel import forms the 4th circulation loop；End water circulating pump 18 is connected on user end water return pipeline 17.
The present invention realizes two stages of compression using double-compressor, uses double stage heat pump heating, it is ensured that heat pump system is cold
Reliably working under cold environmental condition, and very high comprehensive operation efficiency is obtained in entire Heating Season, simultaneity factor can also be used in
Refrigeration reduces the idleness of equipment time, improves utilization rate of equipment and installations.The compressor of Two-stage Heat Pump System is independent two compressor,
It can be connected into Bi-level mode operation, can also be run with primary compressor, the single mode operation that secondary compressor stops.
Further, be to guarantee system run all right, shortage of heat when preventing system defrost, be equipped in surge tank 5 electricity plus
Hot device 19.
Preferably, secondary condenser 7 is that threeway guidance tape changes structure.It is also possible to double plate tube shell and tube heat exchanger.
Secondary condenser of the invention realizes heat exchange using three-way guidance tape typed heat exchanger, it is ensured that Two-stage Heat Pump System
It is kept completely separate with end pipeline system heat transfer medium, medium is antifreeze medium in system, prevents circulating pump from enduring cold impaired, under low temperature
It will not condense, reduce the complexity of antifreeze control in system；End medium is the heating water of user.Triple channel function point
It Wei not secondary heat pump coolant channel, second servo loop circulatory mediator channel, end heating channel.
Preferably, first circulation circuit is for placing ultra low temperature refrigerant, third circulation loop for placing high temperature system
Cryogen.Second circulation circuit is for placing anti-icing fluid.
Ultra low temperature refrigerant preferentially selects R410A refrigerant；High temperature refrigerant preferentially selects R134a refrigerant.This hair
Bright system can provide 70 DEG C of hot water in -40 DEG C of ambient temperature stables.
It is automatically controlled to realize, the first switching valve 13 and the second switching valve 25 are motor-driven valve switching valve, and triple valve 26 is
Electric T-shaped valve.
The present invention realizes the circulation of automatic switchover and control system by two two-way valves or a triple valve.
In second circulation loop, in the outlet of connection surge tank and secondary evaporator circulatory mediator inlet ductwork addition electricity
Dynamic valve particularly may be divided into single-stage heating circulation loop, refrigeration cycle to realize the switching of circulation loop function, and defrost follows
Ring, dual stage hanker a circulation loop.
Preferably, to realize automated system operation control, third pipeline 10 is equipped with the first hygrosensor 20；Surge tank
5 are equipped with second temperature detector 21；Second pipe 8 is equipped with third hygrosensor 22；On heating terminal water supply pipe 16
Equipped with the 4th hygrosensor 23；User end water return pipeline 17 is equipped with the 5th hygrosensor 24.
It can be realized according to system set point temperature parameter by the 5th hygrosensor of acquisition, third hygrosensor temperature
The functions such as system automatic heating and system end pipeline are antifreeze；Second temperature detector is set in surge tank, passes through acquisition
The temperature of second temperature detector can start or stop automatically electric heater according to system set point temperature.First hygrosensor 20
It can be used for showing the temperature of anti-icing fluid in second circulation circuit.4th hygrosensor temperature of end water supply pipe is mainly used for
Show supply water temperature.
The present invention also provides a kind of control methods of above-mentioned Two-stage Heat Pump System, comprising the following steps:
Referring to fig. 2, twin-stage heating condition: when the temperature of the 5th hygrosensor 24 detection is lower than the first setting initiation value
When (such as 30 DEG C), the first, second, third and fourth circulation loop is opened, opens the first switching valve 13, closes the second switching valve
25；Wherein first circulation circuit is the level-one energy source of Two-stage Heat Pump System, absorbs the heat in air by primary evaporator 1
Amount passes to second circulation circuit after the heating of primary compressor 2, then through primary condenser 3；By first circulation circuit heat
Amount is transmitted to third circulation loop by secondary evaporator 9, after promoting temperature by secondary compressor 14, passes through secondary condenser
7 are transmitted to the 4th circulation loop, for heating to user；When the temperature of the 5th hygrosensor 24 detection is greater than or equal to first
When setting stop value (such as 35 DEG C), system stalls.When the temperature of third hygrosensor detection under this working condition
When lower than set temperature value (such as 15 DEG C), control system will suspend the work of third circulation loop, to protect third circulation system
Interior secondary evaporator does not occur freezing because temperature is too low.When the temperature that third hygrosensor 22 detects is greater than or equal to
When set temperature (such as 18 DEG C), control system can start third circulation loop normal work automatically.
Referring to Fig. 3, single-stage heating condition: unlatching first, second and the 4th circulation loop are opened the second switching valve 25, are closed
The first switching valve 13 is closed, when the temperature of the 5th hygrosensor 24 detection is lower than second setting initiation value (such as 30 DEG C), is led to
The heat in the absorption air of primary evaporator 1 is crossed, passes to second by primary condenser 3 after the heating of primary compressor 2
Circulation loop；Anti-icing fluid is passed first circulation circuit heat by secondary condenser 7 as heat-conducting medium in second circulation circuit
It is delivered to the 4th circulation loop, for heating to user；When the temperature of the 5th hygrosensor 24 detection is greater than or equal to second
When setting stop value (such as 35 DEG C), system stalls.
Referring to fig. 4, defrost operating condition: closing the third and fourth circulation loop, opens the first and second circulation loops, opens the
One switching valve 13 closes the second switching valve 25；Heat transfer is to primary in the antifreeze medium extraction surge tank 5 in second circulation circuit
Condenser 3, then heat is sent in primary evaporator 1 and discharged after primary compressor 2, it is used for defrost；It is stored up when in surge tank 5
When depositing shortage of heat, starts 19 additional heat of electric heater in surge tank 5, guarantee that defrost smoothly completes；
Referring to Fig. 5, cooling condition: closing third circulation loop, opens first, second and the 4th circulation loop, opens the
Two switching valves 25 close the first switching valve 13；When the temperature of the 5th hygrosensor 24 detection is higher than setting initiation value (such as 25
DEG C) when, the inverse operation in first circulation circuit is realized from heat is absorbed in user room and by primary evaporator 1 to radiating in air
For the purpose of user's refrigeration.When the temperature of the 5th hygrosensor 24 detection is less than or equal to setting stop value (such as 18 DEG C)
When, system stalls.
When the temperature that system monitoring to the 5th hygrosensor 24 detects lower than default anti-frost protection temperature value (such as
4 DEG C), system starts antifreeze function, such as antifreeze circulation, antifreeze electric-heating belt etc. automatically.When the 5th hygrosensor 24 detects
Temperature be greater than or equal to default anti-frost protection stop temperature value (such as 10 DEG C) when, system is automatically stopped antifreeze function.
Two-stage Heat Pump System of the invention can be according to environment temperature adjust automatically list twin-stage Working mould under heating state
Formula guarantees that system remains that efficient stable works.Triple valve is such as used, when using above-mentioned operating condition, corresponding open needs
The circulation all the way opened.
In the embodiment of the present invention, when the temperature of the 5th hygrosensor 24 detection is lower than the first setting initiation value, choosing
It selects and opens twin-stage heating condition or single-stage heating condition；
When the temperature of the 5th hygrosensor 24 detection is greater than or equal to the first setting stop value, stop dual stage thermal technology
Condition or single-stage heating condition；
Under twin-stage heating condition, when the temperature of third hygrosensor detection is lower than set temperature value, control system
Suspend the work of third circulation loop；When third hygrosensor temperature value is greater than or equal to set temperature value, control system starting
Third circulation loop works normally；
When the temperature of the 5th hygrosensor detection is higher than the second setting initiation value, cooling condition is opened；When the 5th temperature
When spending the temperature of detector points less than or equal to the second setting stop value, cooling condition is closed.
Described first sets initiation value as 20-55 DEG C, and preferably 30 DEG C, 18 DEG C, 20 DEG C, 25 DEG C, 31 DEG C, 40 DEG C, 45 DEG C, 50
DEG C or 55 DEG C, can be selected as needed；Described first sets stop value as 25-60 DEG C, and preferably 31 DEG C, 32 DEG C, 33 DEG C, 34
DEG C, 35 DEG C, 45 DEG C, 55 DEG C or 60 DEG C, can be selected as needed；The set temperature value be 10-25 DEG C, preferably 15 DEG C,
It 16 DEG C, 20 DEG C, 17 DEG C, 18 DEG C, 20 DEG C, 22 DEG C or 25 DEG C, can be selected according to the needs of actual conditions；Second setting
Initiation value is 10-30 DEG C, preferably 23 DEG C, 24 DEG C, 25 DEG C, 26 DEG C or 27 DEG C, can be selected as needed；Second setting
Stop value is 7-25 DEG C, preferably 15 DEG C, 16 DEG C, 17 DEG C, 18 DEG C or 20 DEG C, can be selected as needed.
Described first sets initiation value as 20-55 DEG C；Described first sets stop value as 25-60 DEG C；The set temperature
Value is 10-25 DEG C；Described second sets initiation value as 10-30 DEG C；Described second sets stop value as 7-25 DEG C.
The foregoing is merely presently preferred embodiments of the present invention, is not intended to limit the invention, it is all in spirit of the invention and
Within principle, any modification, equivalent replacement, improvement and so on be should all be included in the protection scope of the present invention.
Claims (9)
1. a kind of Two-stage Heat Pump System, which is characterized in that including first circulation circuit, second circulation circuit, third circulation loop,
4th circulation loop and primary evaporator；
The primary evaporator connects primary compressor, and the first passage of the primary compressor connection primary condenser is described
The first passage of primary condenser connects primary throttle part, and the primary throttle part connects the primary evaporator, formed
First circulation circuit；
The second channel outlet connection surge tank of the primary condenser, the surge tank connect secondary condensation by first pipe
The first passage outlet of the first passage import of device, the secondary condenser connects the first of secondary evaporator by second pipe
Channel, the first passage outlet of the secondary evaporator by third pipeline connect the second channel of the primary condenser into
Mouthful, form second circulation circuit；It is connected with system circulation pump and expansion drum on the third pipeline in turn；The surge tank goes out
Mouth is equipped with two switching valves of triple valve or connection, and the triple valve, the threeway are equipped between the surge tank and first pipe
Valve connects second pipe；The first switching valve, the first switching valve connection are connected between the first pipe and second pipe
The second switching valve is connected on the pipeline of the secondary condenser；
The second channel outlet of the secondary evaporator by secondary compressor connect the second channel of the secondary condenser into
Mouthful, the outlet of the second channel of the secondary condenser by secondary throttle part connect the second channel of the secondary evaporator into
Mouthful, form third circulation loop；
The third channel outlet connection heating terminal water supply pipe of the secondary condenser, the heating terminal water supply pipe connection
The outlet of the import of user heating side, the user heating side connects the secondary condenser by user end water return pipeline
Third channel import forms the 4th circulation loop；End water circulating pump is connected on the water return pipeline of the user end.
2. Two-stage Heat Pump System according to claim 1, which is characterized in that be equipped with electric heater in the surge tank.
3. Two-stage Heat Pump System according to claim 1, which is characterized in that the secondary condenser threeway guidance tape changes or double
Coil pipe shell and tube exchanger.
4. Two-stage Heat Pump System according to claim 1-3, which is characterized in that the first circulation circuit is used for
Place ultra low temperature refrigerant；The third circulation loop is for placing high temperature refrigerant.
5. Two-stage Heat Pump System according to claim 4, which is characterized in that first switching valve and the second switching valve are
Motor-driven valve switching valve, the triple valve are electric T-shaped valve.
6. Two-stage Heat Pump System according to claim 4, which is characterized in that the third pipeline is visited equipped with the first temperature
Survey device；The surge tank is equipped with second temperature detector；The second pipe is equipped with third hygrosensor；The heating
End water supply pipe is equipped with the 4th hygrosensor；User end water return pipeline is equipped with the 5th hygrosensor.
7. a kind of control method of Two-stage Heat Pump System as claimed in any one of claims 1 to 6, which is characterized in that including following
Step:
Twin-stage heating condition: opening the first, second, third and fourth circulation loop, opens the first switching valve, closes the second switching
Valve；The heat in air is absorbed by primary evaporator, is passed to after primary compressor heats up, then through primary condenser
Second circulation circuit；First circulation circuit heat is transmitted to third circulation loop by secondary evaporator, is compressed by secondary
After machine promotes temperature, the 4th circulation loop is transmitted to by secondary condenser, for heating to user；
Single-stage heating condition: unlatching first, second and the 4th circulation loop open the second switching valve, close the first switching valve, lead to
The heat in primary evaporator absorption air is crossed, second circulation is passed to by primary condenser after primary compressor heats up
Circuit；First circulation circuit heat is transmitted to by anti-icing fluid as heat-conducting medium by secondary condenser in second circulation circuit
4th circulation loop, for heating to user；
Defrost operating condition: closing the third and fourth circulation loop, opens the first and second circulation loops, opens the first switching valve, closes
Close the second switching valve, the antifreeze medium in second circulation circuit extracts in surge tank heat transfer to primary condenser, then through primary
Heat is sent in primary evaporator and discharged after compressor, is used for defrost；When storing shortage of heat in surge tank, starting is slow
Rush electric heater additional heat in tank；
Cooling condition: third circulation loop, unlatching first, second and the 4th circulation loop are closed, the second switching valve is opened, is closed
First switching valve；The inverse operation in first circulation circuit, from absorbing heat in user room and by primary evaporator to radiating in air.
8. control method according to claim 7, which is characterized in that when the temperature of the 5th hygrosensor detection is lower than the
When one setting initiation value, twin-stage heating condition or single-stage heating condition are opened in selection；
When the temperature of the 5th hygrosensor detection is greater than or equal to the first setting stop value, stop twin-stage heating condition or list
Grade heating condition；
Under twin-stage heating condition, when the temperature of third hygrosensor detection is lower than set temperature value, control system pause
The work of third circulation loop；When third hygrosensor temperature value is greater than or equal to set temperature value, control system starts third
Circulation loop works normally；
When the temperature of the 5th hygrosensor detection is higher than the second setting initiation value, cooling condition is opened；When the 5th temperature is visited
When surveying the temperature of device point less than or equal to the second setting stop value, cooling condition is closed.
9. control method according to claim 8, which is characterized in that described first sets initiation value as 20-55 DEG C；It is described
First sets stop value as 25-60 DEG C；The set temperature value is 10-25 DEG C；Described second sets initiation value as 10-30 DEG C；
Described second sets stop value as 7-25 DEG C.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110594919A (en) * | 2019-09-29 | 2019-12-20 | 北京四季通能源科技有限公司 | Air source heat pump system and control method thereof |
| CN110594919B (en) * | 2019-09-29 | 2024-02-13 | 北京四季通能源科技有限公司 | Air source heat pump system and control method thereof |
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| Publication number | Publication date |
|---|---|
| CN109813005B (en) | 2023-09-22 |
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