CN110207300A - A kind of double condensation SPLIT AIR-CONDITIONING SYSTEMs with heat recovery function are integrated - Google Patents
A kind of double condensation SPLIT AIR-CONDITIONING SYSTEMs with heat recovery function are integrated Download PDFInfo
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- CN110207300A CN110207300A CN201910597840.3A CN201910597840A CN110207300A CN 110207300 A CN110207300 A CN 110207300A CN 201910597840 A CN201910597840 A CN 201910597840A CN 110207300 A CN110207300 A CN 110207300A
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/89—Arrangement or mounting of control or safety devices
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
- F24F13/30—Arrangement or mounting of heat-exchangers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F5/00—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater
- F24F5/0007—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater cooling apparatus specially adapted for use in air-conditioning
- F24F5/001—Compression cycle type
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F5/00—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater
- F24F5/0096—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater combined with domestic apparatus
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2221/00—Details or features not otherwise provided for
- F24F2221/18—Details or features not otherwise provided for combined with domestic apparatus
- F24F2221/183—Details or features not otherwise provided for combined with domestic apparatus combined with a hot-water boiler
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2221/00—Details or features not otherwise provided for
- F24F2221/34—Heater, e.g. gas burner, electric air heater
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Heat-Pump Type And Storage Water Heaters (AREA)
Abstract
Double condensation SPLIT AIR-CONDITIONING SYSTEMs with heat recovery function that the invention discloses a kind of are integrated, including more double condensation split-type air conditioners, in every double condensation split-type air conditioners, shell side, first solenoid valve, device for drying and filtering, restricting element, finned tube evaporator of the exhaust outlet of compressor through double pipe heat exchanger, then connect compressor inlet and form total heat recovery circuit；In every double condensation split-type air conditioners, shell side, second solenoid valve, Fin-tube Condenser, device for drying and filtering, restricting element, finned tube evaporator of the exhaust outlet of compressor through double pipe heat exchanger, then connect compressor inlet and form part heat recovery circuit.The present invention can take into account the relationship of condensing units amount and refrigerating efficiency, can reasonably recycle the condensation heat of more split-type air conditioners, realize the function of preparation domestic hot-water.
Description
Technical field
The present invention relates to air-conditioning system technical field, a kind of specifically split type sky of double condensations with heat recovery function
Adjusting system is integrated.
Background technique
With the raising of economic level, coverage rate of China's split-type air conditioner in residential building is continuously improved, more and more
Resident be mounted with split-type air conditioner at home.The condensation heat of split-type air conditioner is discharged in atmosphere by air-cooled radiator, this makes
At energy waste and environmental thermal pollution.Residential building has biggish hot water use demand again simultaneously, and preparation domestic hot-water needs
Consume more high-grade energy.
Air-conditioner power consumption accounts for sizable specific gravity in the building energy consumption in current China, and the condensation heat of air-conditioning is exhausted directly to greatly
Biggish energy waste is caused in gas, is further exacerbated by urban heat land effect.It also to be consumed in life simultaneously a certain amount of
High-grade energy prepares domestic hot-water.If can be using the condensation heat of split-type air conditioner come heating domestic hot water, from energy benefit
It is very effective from the perspective of.There is this kind of patent at present, but these have the Domestic separating of condensing units function
In the design of air-conditioning patent, refrigerating efficiency cannot be taken into account while preparing hot water, and cannot be by the cold of more split-type air conditioners
Coagulate hot centralized recovery.If thinking the air conditioner product of development and utilization air conditioner condensation hot preparation hot water, have to consider refrigerating efficiency, no
Refrigerating efficiency can be reduced because preparing hot water.Compared to the one independent recovering condensing heat of split-type air conditioner, more points of centralized recovery
The condensation heat of body formula air-conditioning can provide the user with more domestic hot-waters, and system stability is more preferable.
To solve the above-mentioned problems, there will be domestic hot-water's demand and need to install the occasion of more split-type air conditioners (such as
Students' dormitory building) in air conditioner condensation heat centralized recovery, achieve the purpose that effective use of energy sources, protection environment, it is necessary to provide
One kind can take into account air conditioner refrigerating efficiency, can more split-type air conditioners of centralized recovery condensation heat, be used to prepare domestic hot-water's
Air-conditioning system is integrated.
Summary of the invention
In order to solve the problems, such as that the condensation heat waster of splitting air conditioner causes environmental thermal pollution, and also to solve
The supply problem of domestic hot-water, the present invention, which provides one kind, can take into account air conditioner refrigerating efficiency, can more split type skies of centralized recovery
Condensation heat is adjusted, the double condensation SPLIT AIR-CONDITIONING SYSTEMs with heat recovery function for being used to prepare domestic hot-water are integrated.
In order to achieve the above objectives, the invention adopts the following technical scheme:
A kind of double condensation SPLIT AIR-CONDITIONING SYSTEMs with heat recovery function are integrated, including more double condensation split-type air conditioners, every
In the double condensation split-type air conditioners of platform, the exhaust outlet of compressor is through the shell side of double pipe heat exchanger, the first solenoid valve, dry filter
Device, restricting element, finned tube evaporator, then connect compressor inlet and form total heat recovery circuit；It is seperated in every double condensations
In formula air-conditioning, the exhaust outlet of compressor is through the shell side of double pipe heat exchanger, second solenoid valve, Fin-tube Condenser, dried
Filter, restricting element, finned tube evaporator, then connect compressor inlet and form part heat recovery circuit；Every double condensation point
The exit branch of double pipe heat exchanger in body formula air-conditioning and the water outlet main pipe of double pipe heat exchanger connect, double pipe heat exchanger
Connection is responsible in the water inlet of water inlet pipe and double pipe heat exchanger, is equipped with frequency conversion water circulating pump in water outlet main pipe, on water inlet pipe
First electric two-way valve is installed.
Among the above, the first temperature sensor is installed on the exhaust pipe of compressor.
Among the above, manual water pipe and automatic water supplement pipeline, manual water pipe are connected on the first insulated water tank respectively
In manual water compensating valve is installed, be automatically replenished on pipeline and ball-cock assembly be installed.
Among the above, liquidometer is installed on the first insulated water tank.
Among the above, it is additionally provided with the second insulated water tank, and the second insulated water tank is connected by communicating pipe and the first insulated water tank
It connects, the second electric two-way valve is installed on communicating pipe, the hot water outlet of the second insulated water tank passes through water supply through variable frequency water supply water pump
Pipe and water supply branch pipe connect hot water user end, and water supplying pipe connects after hot water user end with the refluxing opening of the second insulated water tank
It connects, forms circulation loop.
Among the above, water level sensor is installed on the second insulated water tank.
Among the above, second temperature sensor is installed on the second insulated water tank.
Among the above, ancillary heating equipment is installed on the second insulated water tank.
Compared with existing split-type air conditioner product on the market, further improvement of the present invention are as follows: condensation heat can be taken into account
The relationship of yield and refrigerating efficiency accomplishes supplemented by recovering condensing heat, reasonably to recycle more split-type air conditioners based on freezing
Condensation heat, realize preparation domestic hot-water function.
Detailed description of the invention
Fig. 1 is the structural diagram of the present invention.
In figure, 1- separate type air conditioner, 2- compressor, 3- finned tube evaporator, 4- cross flow fan, 5- restricting element,
6- device for drying and filtering, the first solenoid valve of 7-, 8- Fin-tube Condenser, 9- axial flow blower, 10- second solenoid valve, 11- bushing type
Heat exchanger, the first electric two-way valve of 12-, 13- exit branch, 14- water inlet pipe, 15- automatic water supplement pipeline, 16- ball-cock assembly,
17- frequency conversion water circulating pump, the second electric two-way valve of 18-, 19- ancillary heating equipment, 20- hot water user end, 21- variable frequency water supply
Water pump, 22- water supplying pipe, the second insulated water tank of 23-, 24- communicating pipe, the first insulated water tank of 25-, 26- water outlet main pipe, 27- water inlet
Supervisor, the first controller of 28-, the first temperature sensor of 29-, 30- water level sensor, 31- second controller, 32- second temperature
The manual water compensating valve of sensor, 33-, 34- liquidometer, the manual water pipe of 35-.
Specific embodiment
To make the object, technical solutions and advantages of the present invention clearer, below in conjunction with attached drawing to each reality of the invention
The mode of applying is explained in detail.
As shown in Figure 1, a kind of double condensation SPLIT AIR-CONDITIONING SYSTEMs with heat recovery function provided by the invention are integrated, including
More double condensation split-type air conditioners 1, in every double condensation split-type air conditioners 1, the exhaust outlet of compressor 2 is through double pipe heat exchanger
11 shell side, the first solenoid valve 7, device for drying and filtering 6, restricting element 5, finned tube evaporator 3, then connect the air inlet of compressor 2
The degree of lip-rounding helps heat recovery circuit；In every double condensation split-type air conditioners 1, the exhaust outlet of compressor 2 is through double pipe heat exchanger 11
Shell side, second solenoid valve 10, Fin-tube Condenser 8, device for drying and filtering 6, restricting element 5, finned tube evaporator 3, then
The air inlet for connecing compressor 2 forms part heat recovery circuit；Double pipe heat exchanger in every double condensation split-type air conditioners 1 goes out
Water branch pipe 13 is connect with water outlet main pipe 26, and the water inlet pipe 14 of double pipe heat exchanger is connect with water inlet supervisor 27, water outlet main pipe 26
On frequency conversion water circulating pump 17 is installed, the first electric two-way valve 12 is installed, Fin-tube Condenser 8 has on water inlet pipe 14
Axial flow blower 9, finned tube evaporator 3 have cross flow fan 4, and the first solenoid valve 7 is mounted on the bypass of Fin-tube Condenser 8
On the road.Wherein, the first temperature sensor 29 is installed on the exhaust pipe of compressor 2, is connected to hand respectively on the first insulated water tank 25
Water pipe 35 and automatic water supplement pipeline 15 are moved, manual water compensating valve 33 is installed on manual water pipe 35, is automatically replenished pipeline
Ball-cock assembly 16 is installed on 15.In addition, liquidometer 34 is installed on first insulated water tank 25, every double condensation split-type air conditioner 1
It is both provided with the first controller 28.
In the present invention, it is additionally provided with the second insulated water tank 23, the second insulated water tank 23 is protected by communicating pipe 24 and first
Reservoir 25 connects, and is equipped with the second electric two-way valve 18 on communicating pipe 24, the hot water outlet in the second insulated water tank 23 is through becoming
Frequency water supply pump 21 connects hot water user end 20 by water supplying pipe 22 and water supply branch pipe, and water supplying pipe 22 is in hot water user end
It is connect later with the refluxing opening of the second insulated water tank 23, forms circulation loop.Level sensor is installed on second insulated water tank 23
Device 30, second temperature sensor 32, ancillary heating equipment 19 and second controller 31.
Operating mode of the invention has the following two kinds:
Total heat recovery operating mode: when separate type air conditioner is run, if double pipe heat exchanger inflow temperature is lower, air conditioner is with complete
Heat recovery mode work.The liquid refrigerant of low-temp low-pressure carries out at finned tube evaporator 3 with from the air of indoor inspiration
Heat exchange, refrigerant suction heat become low-pressure gaseous from low-pressure liquid；Gaseous refrigerant enters compressor 2, presses through compressor 2
After contracting, refrigerant becomes the gaseous refrigerant of high temperature and pressure, exports and flows out through compressor 2, sleeve pipe formula heat exchanger 11, at this time
Second solenoid valve 10 is closed, and the first solenoid valve 7 is opened, and axial flow blower 9 is not turned on, the gaseous refrigerant and bushing type of high temperature and pressure
The water heat exchange of tube side, refrigerant release heat, become high-pressure liquid from high-pressure gaseous in heat exchanger 11.With heat exchange continue into
It goes, the water temperature in the first insulated water tank gradually rises, it will condensation heat-radiation belt is adversely affected, condensation temperature rises, refrigeration
Agent and the heat exchange of water weaken, and air-conditioning Energy Efficiency Ratio decline, delivery temperature increases；When the delivery temperature of compressor 2 rises to setting value
When, entering part recuperation of heat operating mode.
Part recuperation of heat operating mode: when separate type air conditioner is run, when double pipe heat exchanger inflow temperature is higher, compression
When machine delivery temperature is higher than setting value, the first solenoid valve 7 is closed, and second solenoid valve 10 is opened, and axial flow blower 9 is opened, air conditioner
It operates under part recuperation of heat operating mode, at this point, the liquid refrigerant of low-temp low-pressure is at finned tube evaporator 3 and from room
The air of interior inspiration exchanges heat, and refrigerant suction heat becomes low-pressure gaseous from low-pressure liquid；Gaseous refrigerant enters compression
Machine 2, after the compression of compressor 2, refrigerant becomes the gaseous refrigerant of high temperature and pressure, exports and flows out through compressor 2, sleeve pipe
The higher water section of water temperature exchanges heat in formula heat exchanger 11 and tube side, and it is cold that the refrigerant of double pipe heat exchanger outflow enters fin tube type
Condenser 8 continues to exchange heat with outdoor air, and refrigerant becomes high-pressure liquid after releasing heat, and the liquid refrigerant of high pressure enters
After device for drying and filtering 6, flowing into restricting element 5 becomes the liquid refrigerant of low-temp low-pressure after 5 reducing pressure by regulating flow of restricting element, after
Afterflow is so recycled to finned tube evaporator 3.
The workflow of water circulation system is as follows: when the starting of one or more split-type air conditioner units, the starting
Corresponding first electric two-way valve 12 of separate type air conditioner 1 is open state, and frequency conversion water circulating pump 17 is run, in the effect of pump
Under, water is flowed out from the first insulated water tank 25, successively by double pipe heat exchanger water inlet supervisor 27, double pipe heat exchanger water inlet pipe
14, the tube side in double pipe heat exchanger 11 is flowed into, is changed with the gaseous refrigerant of the high temperature and pressure in 11 shell side of double pipe heat exchanger
Heat, water absorb heat, and temperature increases, then successively passes through double pipe heat exchanger exit branch 13, double pipe heat exchanger water outlet main pipe
26, the first insulated water tank 25 is flowed back in water circulating pump 16, so recycles.
The workflow of hot water supply system is as follows: under the action of variable frequency water supply water pump 21, in the second insulated water tank 23
Domestic hot-water each hot water user end 20 is supplied to by water supplying pipe 22.When water level sensor 30 detects the second heat preservation water
When case water level decreasing is to setting value, the second electric two-way valve 18 is opened, and the water in the first insulated water tank 25 is by flowing communicating pipe 24
Enter the second insulated water tank 23, if the temperature of water is not up to desired desired temperature in the second insulated water tank 23, is placed on second
Ancillary heating equipment 19 in insulated water tank 23 will will start, and so that water temperature is risen to setting value, meet the needs of hot water for life.
Water charging system workflow is as follows: when 25 water level decreasing of the first insulated water tank is to setting value, ball-cock assembly 16 is opened,
Tap water carries out moisturizing by automatic water supplement pipeline 15；When water level does not drop to setting value, also observable liquidometer 34 passes through
It opens manual water compensating valve 33 and carries out moisturizing.
Control system of the present invention is as follows:
Double condensation Split-type air-conditioner control systems: the control system of double condensation split-type air conditioners is mainly complete by the first controller 28
At in addition to the common control function of normal domestic use air-conditioning, the first controller 28 also needs control the first solenoid valve 7, second solenoid valve
10 and axial flow blower 9 open and close.When the first temperature sensor 29 detects the delivery temperature of compressor lower than setting value
When, then second solenoid valve 10 is closed, and the first solenoid valve 7 is opened, and axial flow blower 9 is closed, and air conditioner works by total heat recovery mode；
When the first temperature sensor 29 detects the delivery temperature of compressor 2 higher than setting value, the first solenoid valve 7 is closed, the second electricity
Magnet valve 10 is opened, and axial flow blower 9 is opened, and air conditioner works by part heat recovery mode.
Hot water supplies control system: hot water supply control system is completed by second controller 31, and second controller 31 is main
Control the open and close of the second electric two-way valve 18 and ancillary heating equipment 19.When water level sensor 30 detects the second heat preservation
When the water level decreasing of water tank 23 is to setting value, then the second electric two-way valve 18 is opened, and the water of the first insulated water tank 25 passes through connection
Pipe 24 flows into the second insulated water tank 23.After water level in first insulated water tank 25 reduces, ball-cock assembly 16 is opened, and tap water passes through certainly
Dynamic water pipe 15 flows into the first insulated water tank 25.When the water level of the second insulated water tank 23 reaches the interface position with communicating pipe 24
When, the second electric two-way valve 18 is closed.When second temperature sensor 32 detects 23 water temperature drop of the second insulated water tank to setting
When value, ancillary heating equipment 19 is opened；When second temperature sensor 32 detects that 23 water temperature of the second insulated water tank reaches setting value
When, close ancillary heating equipment 19.
In conclusion a kind of double condensation SPLIT AIR-CONDITIONING SYSTEMs with heat recovery function it is integrated can take into account condensing units amount with
The relationship of refrigerating capacity, accomplish with freeze based on, supplemented by recovering condensing heat, reasonably recycle the condensation heat of more split-type air conditioners,
It is used to prepare domestic hot-water.
The present invention is not limited to the above-described embodiments, anyone can obtain the production of other forms under the inspiration of the present invention
Product, if do not use double pipe heat exchanger and use the water-cooled heat exchanger of other forms, do not use variable frequency pump and use fixed frequency pump,
The water-cooled condenser and air-cooled condenser of double-condenser are not to be connected in series but be connected in parallel, however, in its shape or knot
Make any variation, all technical solutions same or similar with the present invention, within protection scope on structure.
Claims (8)
1. a kind of double condensation SPLIT AIR-CONDITIONING SYSTEMs with heat recovery function are integrated, which is characterized in that including more double condensations point
Body formula air-conditioning, in every double condensation split-type air conditioners, the exhaust outlet of compressor is through the shell side of double pipe heat exchanger, the first electromagnetism
Valve, device for drying and filtering, restricting element, finned tube evaporator, then connect compressor inlet and form total heat recovery circuit；At every
In double condensation split-type air conditioners, the exhaust outlet of compressor is through the shell side of double pipe heat exchanger, second solenoid valve, finned tube type condensing
Device, device for drying and filtering, restricting element, finned tube evaporator, then connect compressor inlet and form part heat recovery circuit；Every
The exit branch of double pipe heat exchanger in double condensation split-type air conditioners and the water outlet main pipe of double pipe heat exchanger connect, bushing type
The water inlet of the water inlet pipe and double pipe heat exchanger of heat exchanger, which is responsible for, to be connected, and is equipped with frequency conversion water circulating pump in water outlet main pipe, into
First electric two-way valve is installed on water branch pipe.
2. a kind of double condensation SPLIT AIR-CONDITIONING SYSTEMs with heat recovery function according to claim 1 are integrated, feature exists
In being equipped with the first temperature sensor on the exhaust pipe of compressor.
3. a kind of double condensation SPLIT AIR-CONDITIONING SYSTEMs with heat recovery function according to claim 1 are integrated, feature exists
In manual water pipe and automatic water supplement pipeline are connected on the first insulated water tank respectively, is equipped on manual water pipe manually
Water compensating valve is automatically replenished on pipeline and is equipped with ball-cock assembly.
4. a kind of double condensation SPLIT AIR-CONDITIONING SYSTEMs with heat recovery function according to claim 1 or 3 are integrated, feature
It is, liquidometer is installed on the first insulated water tank.
5. a kind of double condensation SPLIT AIR-CONDITIONING SYSTEMs with heat recovery function according to claim 1 are integrated, feature exists
In it is additionally provided with the second insulated water tank, and the second insulated water tank is pacified on communicating pipe by connecting with the first insulated water tank communicating pipe
Equipped with the second electric two-way valve, the hot water outlet of the second insulated water tank passes through water supplying pipe and water supply branch pipe through variable frequency water supply water pump
Hot water user end is connected, water supplying pipe is connect after hot water user end with the refluxing opening of the second insulated water tank, forms circulation
Circuit.
6. a kind of double condensation SPLIT AIR-CONDITIONING SYSTEMs with heat recovery function according to claim 5 are integrated, feature exists
In being equipped with water level sensor on the second insulated water tank.
7. a kind of double condensation SPLIT AIR-CONDITIONING SYSTEMs with heat recovery function according to claim 5 are integrated, feature exists
In being equipped with second temperature sensor on the second insulated water tank.
8. a kind of double condensation SPLIT AIR-CONDITIONING SYSTEMs with heat recovery function according to claim 5 are integrated, feature exists
In being equipped with ancillary heating equipment on the second insulated water tank.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910597840.3A CN110207300A (en) | 2019-07-04 | 2019-07-04 | A kind of double condensation SPLIT AIR-CONDITIONING SYSTEMs with heat recovery function are integrated |
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| CN201910597840.3A CN110207300A (en) | 2019-07-04 | 2019-07-04 | A kind of double condensation SPLIT AIR-CONDITIONING SYSTEMs with heat recovery function are integrated |
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| JP2015215117A (en) * | 2014-05-09 | 2015-12-03 | シャープ株式会社 | Heat pump type air cooling device |
| CN210568966U (en) * | 2019-07-04 | 2020-05-19 | 广东石油化工学院 | Double-condensation split air conditioner system integration with heat recovery function |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN201081367Y (en) * | 2007-08-01 | 2008-07-02 | 中原工学院 | Heat-recovery geothermal heat pump |
| CN201093649Y (en) * | 2007-09-24 | 2008-07-30 | 刘毅 | Full heat recovery instant heating circulating type water heat supply central air conditioner |
| KR20090105213A (en) * | 2008-04-02 | 2009-10-07 | 주식회사 피닉스건설 | The hot water exclusive use terrestrial heat complex system |
| AU2010100284A4 (en) * | 2010-03-30 | 2010-04-29 | Vast Vision Limited | Heat pump hot water air conditioner |
| CN203824008U (en) * | 2014-04-02 | 2014-09-10 | 浙江思科国祥制冷设备有限公司 | Water chilling unit with capacity of adjusting heat recovery amount |
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