CN106123171A - A kind of Novel variable-frequency controls family's geothermal heat pump air-conditioning system device - Google Patents
A kind of Novel variable-frequency controls family's geothermal heat pump air-conditioning system device Download PDFInfo
- Publication number
- CN106123171A CN106123171A CN201610494648.8A CN201610494648A CN106123171A CN 106123171 A CN106123171 A CN 106123171A CN 201610494648 A CN201610494648 A CN 201610494648A CN 106123171 A CN106123171 A CN 106123171A
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- China
- Prior art keywords
- heat pump
- frequency
- air
- conditioning system
- family
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- 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
- F24F5/0046—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 using natural energy, e.g. solar energy, energy from the ground
- F24F5/005—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 using natural energy, e.g. solar energy, energy from the ground using energy from the ground by air circulation, e.g. "Canadian well"
-
- 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
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
- F24F11/83—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to 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
- 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
-
- 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
- Y02B10/00—Integration of renewable energy sources in buildings
- Y02B10/40—Geothermal heat-pumps
Landscapes
- 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 Energy (AREA)
- Sustainable Development (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention discloses a kind of Novel variable-frequency and control family's geothermal heat pump air-conditioning system device, it includes being made up of central air-conditioning host machine of ground source heat pump and frequency conversion fan coiled radiator end-equipment two parts, described family central air-conditioning host machine of ground source heat pump is connected with frequency conversion fan coiled radiator end-equipment by pipeline, described pipe interior refrigerating medium is the mixing liquid that pure water is combined into ethylene glycol antifreeze, and in described mixing liquid, pure water is 1:4 with the mass ratio of ethylene glycol antifreeze.The Novel variable-frequency of the present invention controls family's geothermal heat pump air-conditioning system device and controls main frame water temperature by frequency conversion fan coiled radiator end-equipment, make main process equipment operate in can imitate under working condition, solve the high energy consumption problem of household air conditioning system, and running is steady, safety, noise are less.
Description
Technical field
The present invention relates to air-conditioning technical field, particularly relate to a kind of Novel variable-frequency and control family's geothermal heat pump air-conditioning system
Device.
Background technology
The energy is human survival and the required material base of social development, enters 21st century, and energy scarcity has become
Global problem for development of all countries economy.At present, the energy consumption of building accounts for the 1/3 of whole nation energy consumption, and (special at public building
Bie Shi megastore, high-grade hotel hotel, high-grade office building etc.) annual energy consumption in, about 50%-60% is consumed in air-conditioning system
Cold and heating system, the fundamental realities of the country based on China and economic situation, China is always based on coal heating, ground, the north for a long time
District is seriously polluted, efficiency of energy utilization is low, and development ground source heat pump technology is minimizing environmental pollution, guarantees the important guarantor of energy security
Barrier, at present, progressively substituting conventional energy resource by regenerative resource is a world trend, along with issuing of China " Renewable Energy Law "
Cloth, accelerating development regenerative resource energetically is to implement country to propose " building a conservation-minded society, develop a circular economy " policy
One of Main Means.Analysis of Ground Source Heat Pump system passes through to absorb the energy of the earth, then by source pump to building cooling
Heat supply, can be widely applied to the buildings such as business premises, public building, apartment, school, hospital, is that regenerative resource exists
The important component part of application in building.
In prior art, the most fixed frequency fan coil radiator, Heating by Ground Source Heat Pump technology cannot be realized and main frame
Joint control, it is impossible to accomplish to save further power consumption, or some implements cost height, it is impossible to and popularization and application, this technology is more simultaneously
It is not applied in household air conditioning.
Summary of the invention
To this end, the technical problem to be solved in the present invention be overcome when prior art utilizes Heating by Ground Source Heat Pump exist upper
State deficiency, and then provide a kind of Novel variable-frequency to control family's geothermal heat pump air-conditioning system device.
For achieving the above object, the present invention is by the following technical solutions:
A kind of Novel variable-frequency controls family's geothermal heat pump air-conditioning system device, and it includes by central air-conditioning host machine of ground source heat pump
With frequency conversion fan coiled radiator end-equipment two parts form, described family central air-conditioning host machine of ground source heat pump by pipeline with
Frequency conversion fan coiled radiator end-equipment connects, and described pipe interior refrigerating medium is that pure water is combined into ethylene glycol antifreeze
Mixing liquid, in described mixing liquid, the mass ratio of pure water and ethylene glycol antifreeze is 1:4.
Preferably, described central air-conditioning host machine of ground source heat pump by plate-type condenser, plate-type evaporator, well water side circulating pump,
Well water side traffic protection switch, air-conditioning side water circulating pump, air-conditioning side traffic protection switch and the first temperature sensor composition, described
First temperature sensor is separately mounted at the intake-outlet of described plate-type condenser and the intake-outlet of described plate-type evaporator,
It is connected by conduit between described plate-type condenser with described well water side circulating pump, described well water side traffic protection switch, described
It is connected also by conduit between plate evaporation condenser with described air-conditioning side circulating pump, described air-conditioning side traffic protection switch.
Preferably, described frequency conversion fan coiled radiator end-equipment is cold by tangential impeller, direct current variable frequency motor, table
Device, double temperature double control frequency-variable controller, shell form, and described tangential impeller is with described direct current variable frequency motor by guidance set even
Connect, the water pipe in the middle of described surface cooler coil pipe is provided with the second temperature sensor, described frequency conversion fan coiled radiator end
Equipment return side is provided with three-temperature sensor, and described second temperature sensor and described three-temperature sensor are all with described
Double temperature double control frequency-variable controller connects.
Preferably, described tangential impeller includes several blades that along the circumferential direction uniform intervals is arranged and for fixing leaf
The fixed disk of sheet, the S-type structure of described blade, a part for described blade at the edge radially outward from described fixed disk, institute
Stating another part of blade in the axis projection being radially disposed in described fixed disk, the edge of described fixed disk offers for holding
Receive the arcuate socket of fixing described blade.
Preferably, being more than in the arc length radially outward from described fixed disk part of described blade is positioned at described fixed disk axle
Arc length in projection.
Preferably, described blade in the arc length radially outward from described fixed disk part with to be positioned at described fixed disk axial
The ratio of the arc length in projection is 1.5-2.5.
Preferably, the point of contact of two sections of arcs of described blade is positioned on the circumference of described fixed disk.
Preferably, the flow-guiding surface coating of the part in the axis projection being radially disposed in described fixed disk of described blade
There is one layer of layer of silica gel.
Preferably, between described central air-conditioning host machine of ground source heat pump to described frequency conversion fan coiled radiator end-equipment
Described pipeline on be disposed with connection by metal hose device, Pressure gauge, water route stop valve.
Beneficial effects of the present invention:
The Novel variable-frequency of the present invention controls family's geothermal heat pump air-conditioning system device by frequency conversion fan coiled radiator end
End equipment controls main frame water temperature, makes main process equipment operate in and can imitate under working condition, solves household air conditioning system
High energy consumption problem, and running is steady, safety, noise are less.
Accompanying drawing explanation
In order to make present disclosure be more likely to be clearly understood, below in conjunction with the accompanying drawings, the present invention is made the most in detail
Thin explanation, wherein:
Fig. 1 is the structural representation that the Novel variable-frequency of the present invention controls family geothermal heat pump air-conditioning system device；
Fig. 2 is the structural representation of the frequency conversion fan coiled radiator end-equipment of the present invention；
Fig. 3 is the end view of the tangential impeller of the present invention；
Fig. 4 is the structural representation of the tangential impeller blade of the present invention；
Fig. 5 is rotation speed of fan and the linear relationship chart of leaving water temperature under heating mode；
Fig. 6 is rotation speed of fan and the linear relationship chart of leaving water temperature under refrigeration mode.
In figure, reference is expressed as:
1-central air-conditioning host machine of ground source heat pump；10-pipeline；11-connection by metal hose device；12-Pressure gauge；13-cuts in water route
Only valve；2-frequency conversion fan coiled radiator end-equipment；3-tangential impeller；31-blade；32-fixed disk；33-arcuate socket；34-
Layer of silica gel；4-direct current variable frequency motor；5-surface cooler；6-double temperature double control frequency-variable controller；7-guidance set；8-shell.
Detailed description of the invention
Seeing Fig. 1, a kind of Novel variable-frequency controls family's geothermal heat pump air-conditioning system device, and it includes by earth source heat pump central authorities
Air-conditioner host 1 and frequency conversion fan coiled radiator end-equipment 2 two parts composition, described family central air-conditioning host machine of ground source heat pump
1 is connected with frequency conversion fan coiled radiator end-equipment 2, from described central air-conditioning host machine of ground source heat pump 1 to institute by pipeline 10
State and be disposed with connection by metal hose device 11, pressure on the described pipeline between frequency conversion fan coiled radiator end-equipment 2
Table 12, water route stop valve 13, described pipeline 10 internal coolant is the mixing liquid that pure water is combined into ethylene glycol antifreeze,
In described mixing liquid, pure water is 1:4 with the mass ratio of ethylene glycol antifreeze, and the freezing point temperature of this mixing liquid is-10.7
℃.The Novel variable-frequency of the present invention controls family's geothermal heat pump air-conditioning system device by frequency conversion fan coiled radiator end-equipment
Control main frame water temperature, make main process equipment operate in and can imitate under working condition, solve the high energy consumption of household air conditioning system
Problem, and running is steady, safety.Described central air-conditioning host machine of ground source heat pump 1 is by plate-type condenser, plate-type evaporator, well
Water side circulating pump, well water side traffic protection switch, air-conditioning side water circulating pump, air-conditioning side traffic protection switch and the first temperature sensing
Device forms, and described first temperature sensor is separately mounted to the intake-outlet of described plate-type condenser and described plate-type evaporator
At intake-outlet, by leading between described plate-type condenser and described well water side circulating pump, described well water side traffic protection switch
Pipe connects, also by leading between described plate evaporation condenser and described air-conditioning side circulating pump, described air-conditioning side traffic protection switch
Pipe connects.
Seeing Fig. 2, described frequency conversion fan coiled radiator end-equipment 2 is by tangential impeller 3, direct current variable frequency motor 4, table
Cooler 5, double temperature double control frequency-variable controller 6, shell 8 form, and described tangential impeller 3 and described direct current variable frequency motor 4 are by guiding
Assembly 7 connects, and the water pipe in the middle of described surface cooler 5 coil pipe is provided with the second temperature sensor, and described frequency conversion fan coil pipe dissipates
Hot device end-equipment 2 return side is provided with three-temperature sensor, described second temperature sensor and described 3rd temperature sensing
Device is all connected with described double temperature double control frequency-variable controller 6.
See Fig. 3-4, described tangential impeller 3 include several along the circumferential direction uniform intervals arrange blades 31 and for
The fixed disk 32 of fixing blade 31, the described S-type structure of blade 31, a part (seeing A section arc in Fig. 3) for described blade 31 exists
Radially outward from the edge of described fixed disk 32, another part (seeing B end arc in Fig. 3) of described blade 31 is being radially disposed in
Stating in the axis projection of fixed disk 32, the edge of described fixed disk 32 offers the arcuate socket for accommodating fixing described blade 31
33.Blade on the tangential impeller of the present invention uses S type structure actual, compares traditional semicircular arc blade, its air blast effect
More preferably, and noise is low, and can reduce the strength of vortex within tangential impeller.
In order to improve the blowing efficiency of blade further and drop low wind noise, described blade 31 radially outward from described solid
The arc length (A section arc) of price fixing 32 part is more than the arc length (B section arc) being positioned at described fixed disk 32 axis projection.Described blade 31
The ratio in arc length and the arc length being positioned at described fixed disk 32 axis projection radially outward from described fixed disk 32 part
For 1.5-2.5.
For the ease of installing blade, and strengthen the mounting stability of blade 31, two sections of arcs of described blade 31 (A section in Fig. 3
The intersection of arc and B section arc) point of contact be positioned on the circumference of described fixed disk 32.
The flow direction of the wind in order to optimize and then within tangential impeller 3, improves distinguished and admirable stationarity, described blade 31 in footpath
Part flow-guiding surface to the axis projection being positioned at described fixed disk 32 is coated with one layer of layer of silica gel 34.
The control logic of the double temperature double control frequency-variable controller of the present invention is:
1. heating mode: design temperature ST, room temperature RT, air-conditioner water outlet temperature WT, Δ T=ST-RT, when WT < 25 DEG C,
Blowing-out dish, when WT 25 DEG C and ST-RT > DEG C rotation speed of fan and air-conditioner water outlet temperature are the linear relationship shown in Fig. 5, regulates at this
During, if in 30 minutes, water temperature does not rise to 35 DEG C, and wind speed reduces a grade, if at next 30 minutes
The most not rising 35 DEG C, wind speed reduces a grade again, the like.If rising 35 a water temperature in 30 minutes
DEG C, it is returned to original wind speed scale successively.
Linear relationship below | ST-RT | 2 rotation speed of fan with Δ T, in the range of the maximum wind velocity (R1) that water temperature is given,
The temperature difference and maximum wind velocity R1 linear relationship is utilized to regulate wind speed, during thermostatic control, Automatic-searching constant temperature rotating speed, as far as possible
Accomplish constant temperature, not stall.
If ST+0.5 > RT > ST-0.5, RT-ST ＞ 2, rotation speed of fan 200 turns, after 30min, still RT-ST ＞ 2 blower fan stops
Rotate.
2, refrigeration mode: ST < RT, indoor fan rotating speed and leaving water temperature, according to the linear relationship described in Fig. 6, are adjusted at this
During joint, if in 30 minutes, water temperature does not drop to 10 DEG C, and wind speed reduces a grade, if at next 30 points
The most not declining 10 DEG C in clock, wind speed reduces a grade again, the like.If at a water temperature drop 10 in 30 minutes
DEG C, it is returned to original wind speed scale successively.
Linear relationship below | ST-RT | 2 rotation speed of fan with Δ T.
In the range of the maximum wind velocity (R1) that water temperature is given, the temperature difference is utilized to regulate wind speed with maximum wind velocity R1 linear relationship,
During thermostatic control, Automatic-searching constant temperature rotating speed, accomplish constant temperature, not stall as far as possible.
Work as ST+0.5 > RT > ST-0.5, ST-RT ＞ 2, rotation speed of fan 200 turns, still ST-RT ＞ 2 after 30min, blower fan stops
Spline is moved.
3, blower fan manual mode: under blower fan manual mode: low speed: rotation speed of fan 400 turns, middling speed 800 turns, at a high speed 1200
Turn.Blower fan is no longer according to lower water temperature.
Technical scheme is simply explained in detail by above-mentioned detailed description of the invention, the present invention the most only office
Be limited to above-described embodiment, it will be understood by those skilled in the art that every according to above-mentioned principle and spirit on the basis of the present invention
Improve, substitute, all should be within protection scope of the present invention.
Claims (8)
1. a Novel variable-frequency controls family's geothermal heat pump air-conditioning system device, it is characterised in that: include by earth source heat pump central authorities
Air-conditioner host and frequency conversion fan coiled radiator end-equipment two parts composition, described family central air-conditioning host machine of ground source heat pump leads to
Piping is connected with frequency conversion fan coiled radiator end-equipment, and described pipe interior refrigerating medium is that pure water is antifreeze with ethylene glycol
The mixing liquid that liquid is combined into, in described mixing liquid, pure water is 1:4 with the mass ratio of ethylene glycol antifreeze.
Novel variable-frequency the most according to claim 1 controls family's geothermal heat pump air-conditioning system device, it is characterised in that: described
Central air-conditioning host machine of ground source heat pump by plate-type condenser, plate-type evaporator, well water side circulating pump, well water side traffic protection switch,
Air-conditioning side water circulating pump, air-conditioning side traffic protection switch and the first temperature sensor composition, described first temperature sensor is respectively
It is arranged at the intake-outlet of described plate-type condenser and the intake-outlet of described plate-type evaporator, described plate-type condenser and institute
Stating and connected by conduit between well water side circulating pump, described well water side traffic protection switch, described plate evaporation condenser is with described
Connect also by conduit between air-conditioning side circulating pump, described air-conditioning side traffic protection switch.
Novel variable-frequency the most according to claim 1 and 2 controls family's geothermal heat pump air-conditioning system device, it is characterised in that:
Described frequency conversion fan coiled radiator end-equipment is by tangential impeller, direct current variable frequency motor, surface cooler, double temperature double control frequency conversion control
Device processed, shell form, and described tangential impeller is connected by guidance set with described direct current variable frequency motor, in described surface cooler coil pipe
Between water pipe on be provided with the second temperature sensor, described frequency conversion fan coiled radiator end-equipment return side is provided with the 3rd
Temperature sensor, described second temperature sensor and described three-temperature sensor are all with described double temperature double control frequency-variable controller even
Connect.
Novel variable-frequency the most according to claim 3 controls family's geothermal heat pump air-conditioning system device, it is characterised in that: described
Tangential impeller includes several blades that along the circumferential direction uniform intervals is arranged and for fixing the fixed disk of blade, described blade
S-type structure, a part for described blade is at the edge radially outward from described fixed disk, and another part of described blade is in footpath
To being positioned at the axis projection of described fixed disk, the edge of described fixed disk offers the arc for accommodating fixing described blade
Hole.
Novel variable-frequency the most according to claim 4 controls family's geothermal heat pump air-conditioning system device, it is characterised in that: described
Blade in the arc length radially outward from described fixed disk part more than being positioned at the arc length of described fixed disk axis projection.
6. control family's geothermal heat pump air-conditioning system device according to the Novel variable-frequency described in claim 4 or 5, it is characterised in that:
Described blade radially outward from the arc length of described fixed disk part and the arc length being positioned at described fixed disk axis projection
Ratio is 1.5-2.5.
7. control family's geothermal heat pump air-conditioning system device, its feature according to the Novel variable-frequency described in any one of claim 4-6
It is: the point of contact of two sections of arcs of described blade is positioned on the circumference of described fixed disk.
8. control family's geothermal heat pump air-conditioning system device, its feature according to the Novel variable-frequency described in any one of claim 4-7
It is: the flow-guiding surface of the part in the axis projection being radially disposed in described fixed disk of described blade is coated with one layer of silica gel
Layer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610494648.8A CN106123171A (en) | 2016-06-28 | 2016-06-28 | A kind of Novel variable-frequency controls family's geothermal heat pump air-conditioning system device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610494648.8A CN106123171A (en) | 2016-06-28 | 2016-06-28 | A kind of Novel variable-frequency controls family's geothermal heat pump air-conditioning system device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106123171A true CN106123171A (en) | 2016-11-16 |
Family
ID=57285495
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|---|---|---|---|
| CN201610494648.8A Pending CN106123171A (en) | 2016-06-28 | 2016-06-28 | A kind of Novel variable-frequency controls family's geothermal heat pump air-conditioning system device |
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| US3921272A (en) * | 1974-05-24 | 1975-11-25 | Torin Corp | Blower wheel and method of making the same |
| CN2395073Y (en) * | 1999-11-19 | 2000-09-06 | 上海顺威电器有限公司 | Composite blade |
| JP2006170043A (en) * | 2004-12-15 | 2006-06-29 | Matsushita Electric Ind Co Ltd | Cross flow fan |
| CN202253979U (en) * | 2011-08-26 | 2012-05-30 | 华东建筑设计研究院有限公司 | Novel large temperature difference fan coil unit with alternating-current motor |
| CN102575681A (en) * | 2009-09-09 | 2012-07-11 | 夏普株式会社 | Crossflow fan, molding die, and fluid feeding device |
| CN203024276U (en) * | 2012-12-05 | 2013-06-26 | 靖江市宝钢空调设备厂 | Intelligent direct current frequency conversion fan coil unit |
| CN104747492A (en) * | 2013-12-25 | 2015-07-01 | 珠海格力电器股份有限公司 | Cross-flow impeller, cross-flow fan and wall-mounted air conditioner |
| CN204880479U (en) * | 2015-07-21 | 2015-12-16 | 中铁城建集团南昌建设有限公司 | Ground source heat pump system |
| CN105240937A (en) * | 2015-10-12 | 2016-01-13 | 珠海格力电器股份有限公司 | Air conditioner indoor unit and air conditioner |
-
2016
- 2016-06-28 CN CN201610494648.8A patent/CN106123171A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3921272A (en) * | 1974-05-24 | 1975-11-25 | Torin Corp | Blower wheel and method of making the same |
| CN2395073Y (en) * | 1999-11-19 | 2000-09-06 | 上海顺威电器有限公司 | Composite blade |
| JP2006170043A (en) * | 2004-12-15 | 2006-06-29 | Matsushita Electric Ind Co Ltd | Cross flow fan |
| CN102575681A (en) * | 2009-09-09 | 2012-07-11 | 夏普株式会社 | Crossflow fan, molding die, and fluid feeding device |
| CN202253979U (en) * | 2011-08-26 | 2012-05-30 | 华东建筑设计研究院有限公司 | Novel large temperature difference fan coil unit with alternating-current motor |
| CN203024276U (en) * | 2012-12-05 | 2013-06-26 | 靖江市宝钢空调设备厂 | Intelligent direct current frequency conversion fan coil unit |
| CN104747492A (en) * | 2013-12-25 | 2015-07-01 | 珠海格力电器股份有限公司 | Cross-flow impeller, cross-flow fan and wall-mounted air conditioner |
| CN204880479U (en) * | 2015-07-21 | 2015-12-16 | 中铁城建集团南昌建设有限公司 | Ground source heat pump system |
| CN105240937A (en) * | 2015-10-12 | 2016-01-13 | 珠海格力电器股份有限公司 | Air conditioner indoor unit and air conditioner |
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Application publication date: 20161116 |