CN110094817A - A kind of dedicated radiator based on air source heat pump system - Google Patents
A kind of dedicated radiator based on air source heat pump system Download PDFInfo
- Publication number
- CN110094817A CN110094817A CN201910474695.XA CN201910474695A CN110094817A CN 110094817 A CN110094817 A CN 110094817A CN 201910474695 A CN201910474695 A CN 201910474695A CN 110094817 A CN110094817 A CN 110094817A
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- Prior art keywords
- radiator
- vacuum
- interface
- tank body
- heat pump
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Links
- 238000010438 heat treatment Methods 0.000 claims abstract description 64
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 38
- 239000003507 refrigerant Substances 0.000 claims abstract description 27
- 238000001816 cooling Methods 0.000 claims abstract description 20
- 239000007788 liquid Substances 0.000 claims abstract description 17
- 239000012530 fluid Substances 0.000 claims abstract description 12
- 238000012546 transfer Methods 0.000 claims abstract description 12
- 239000000112 cooling gas Substances 0.000 claims abstract description 4
- 238000007789 sealing Methods 0.000 claims description 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 3
- 229910052802 copper Inorganic materials 0.000 claims description 3
- 239000010949 copper Substances 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 3
- 238000004378 air conditioning Methods 0.000 description 5
- 238000009434 installation Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 3
- 238000007664 blowing Methods 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 230000003750 conditioning effect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000000505 pernicious effect Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 238000009834 vaporization Methods 0.000 description 1
- 230000008016 vaporization Effects 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D19/00—Details
-
- 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
- F24F5/0003—Exclusively-fluid systems
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B30/00—Heat pumps
- F25B30/06—Heat pumps characterised by the source of low potential heat
Abstract
The present invention relates to heating equipment technical fields, more particularly to a kind of dedicated radiator based on air source heat pump system, including the heat pump outdoor unit using pipeline connection, indoor air conditioner, refrigerant converter and radiator, circulation has heat transfer medium in pipeline, radiator includes heat exchanger, cooling fin is connected on heat exchanger, heat exchanger includes the big water column radiator tank body connecting with cooling fin, vacuum fluid reservoir and heating coil are equipped in big water column radiator tank body, vacuum fluid reservoir includes vacuum liquid storage tank, overflow pipe is equipped in vacuum liquid storage tank, the top of vacuum liquid storage tank is equipped with vacuum interface, cooling gas check valve is equipped in vacuum interface, the vacuum pump for adjusting pressure in radiator ontology is connected at vacuum interface, the present invention solves the problems, such as that existing heat pump system is poor for thermal comfort, guaranteeing heating effect simultaneously On the basis of improve efficiency of energy utilization.
Description
Technical field
The present invention relates to heating equipment technical field more particularly to a kind of dedicated heating based on air source heat pump system
Piece.
Background technique
Environment in recent years increasingly causes to pay close attention to energy problem, and also increasingly attaching importance to environmental protection and energy conservation, heat pump are empty for country
Conditioning technology is and easy to operate and be widely used because its summer can freeze, winter can heat, meanwhile, for response, country is " clear
Clean heating " and " coal changes electricity " policy, air source heat pump air-conditioner is because the advantages that easy for installation, use cost is lower, is in domestic air conditioning neck
It is widelyd popularize in domain.
Heat pump air conditioner installs a four-way reversing valve, changes the operation of valve on the basis of common air-conditioning device, can be with
The function of the evaporator and condenser that make original air conditioner is exchanged mutually, so that the function of cooling room air is changed into heating
The function of room air, this winter can be extracted heat from outdoor lower air, be used to heating indoor air, summer by we
Season can remove the heat of room air, be transmitted to outdoor air regulator and be called heat pump air conditioner
Because heat pump air conditioner indoor unit is using same fan coil, the hot dry wind blown out when heating in winter often makes one to feel not
It is suitable, but because when air-conditioning uses door and window it is closed, room air is bad, and human comfort reduces, research shows that the higher confession of comfort
Warm mode is radiant heating, and radiator heating can guarantee heating effect, but traditional radiator heating without blowing feeling in heating again
The a large amount of pipelines of not only needing be laid with and transformation, it is also necessary to have a central heat source, installation is complicated, initial cost higher cost, and uncomfortable
Non- collective's Heating Present States for being widely present of northern area are closed, in conclusion it is convenient to need a kind of energy-saving safe, simple to install, the winter
It can comfortably heat in season and not influence end-equipment in the air conditioning chamber of indoor unit summer cooling.
Summary of the invention
It is an object of the invention to overcome deficiency in the prior art, provide a kind of based on the dedicated of air source heat pump system
Radiator solves the problems, such as that existing heat pump system is poor for thermal comfort, while improving on the basis of guaranteeing heating effect
Efficiency of energy utilization.
The present invention is achieved by the following technical solutions: a kind of dedicated radiator based on air source heat pump system, packet
Heat pump outdoor unit, indoor air conditioner, refrigerant converter and the radiator using pipeline connection are included, circulation has heat transfer in the pipeline
Medium, the radiator include heat exchanger, and cooling fin is connected on the heat exchanger, and the heat exchanger includes connecting with cooling fin
Big water column radiator tank body, be provided with vacuum fluid reservoir and heating coil, the heating in the big water column radiator tank body
Coil pipe exchanges heat in big water column radiator tank body, and the vacuum fluid reservoir includes vacuum liquid storage tank, the vacuum liquid storage
Overflow pipe is provided in tank, the top of the vacuum liquid storage tank is provided with vacuum interface, sets in the vacuum interface
It is equipped with cooling gas check valve, the vacuum pump for adjusting pressure in radiator ontology is connected at the vacuum interface.
Further, the big water column radiator tank body is sealing container, on the left side of the big water column radiator tank body
Portion is provided with radiator ontology interface suitable for reading, and the left lower of the big water column radiator tank body is provided with lower mouth interface, described
Left hand thread is provided in interface suitable for reading and lower mouth interface, the interface suitable for reading and lower mouth interface are connect with cooling fin, described
The right side of big water column radiator tank body is provided with blind plugging, the big water column at the position opposite with interface suitable for reading and lower mouth interface
The right upper portion of radiator tank body is provided with heating tube inlet, and the lower right side of the big water column radiator tank body is provided with heating
Pipe outlet.
Further, the heating coil is composed in parallel by the copper pipe that 3 diameters are 6 millimeters, the inlet of heating coil
Pass through a heating pipe with exit to extend to outside big water column radiator tank body.
Further, the refrigerant installed in series is connected between heat pump outdoor unit and indoor air conditioner on pipeline, institute
It states and is additionally provided with connecting tube between the inflow pipe of refrigerant converter inside and effuser, set respectively on the connecting tube and effuser
It is equipped with a diaphragm check valve, threeway is additionally provided with before two diaphragm check valves, is connected between two threeways by pipeline.
Further, the heat transfer medium need to use pure water or radiator superconducting liquid.
Further, it is provided with EVA noise reducing pipe outside the heating coil, the EVA noise reducing pipe is wrapped in outside heating coil.
The beneficial effects of the present invention are: 1, the winter radiator ontology heating of the present invention achievable air source heat pump system
Perfect switching between summer fan coil cooling supply, reduces the system structure complexity for increasing independent heating system；Work as the summer
When season freezes, refrigerant is pressed former route and is completed for SAPMAC method；When heat supply in winter, cold source, which enters in radiator ontology, exchanges heat and heats biography
Former route is returned to after thermal medium completes circulation.
2, the present invention enters heat by power traction outside air source heat pump in heating, is realized by heat exchanger to the heat transfer of heating end
The heating of medium reduces tradition heating to the consumption of fossil energy and the discharge of pernicious gas, is conducive to environmental protection.
3, the room air when present invention overcomes air conditioning and heating in heating is dry and blowing feeling problem, can will be indoor
Temperature controls between 20 ~ 24 DEG C, and similar to traditional radiator, relatively high comfort level is had for indoor occupant.
4, air source heat pump radiator ontology of the present invention be radiator ontology and heat exchanger are assembled one it is closed
Integral device, reduce the complexity of system, simple to install is convenient, easy to maintain, and the race without having to worry about tradition heating emits drop
The problems such as leakage.
Detailed description of the invention
Fig. 1 is the operation principle schematic diagram of the embodiment of the present invention 1；
Fig. 2 is the radiator ontology overall structure diagram of the embodiment of the present invention 1；
Fig. 3 is the structural schematic diagram of the heat exchanger of the embodiment of the present invention 1；
Fig. 4 is the structural schematic diagram of the refrigerant heat exchanger of the embodiment of the present invention 1；
Wherein: 1- heat pump outdoor unit, 2- pipeline, 3- refrigerant heat exchanger, 31- interface end, 32- interface end, 33- interface end, 34- connect
Mouthful end, 4- heat exchanger, 40- blind plugging, 43- interface suitable for reading, 44- heat tube inlet, the big water column radiator tank body of 45-, and mouth connects under 47-
Mouthful, 48- heating coil, 49- heats pipe outlet, 51- vacuum liquid storage tank, 52- vacuum interface, 53- overflow pipe, 6- Interior Space
Tune machine, 7- cooling fin, 8- diaphragm check valve.
Specific embodiment
In the description of the present invention, it is also necessary to which explanation is unless specifically defined or limited otherwise, term " setting ",
" installation ", " connected ", " connection " shall be understood in a broad sense, for example, it may be fixedly connected, may be a detachable connection or one
Connect to body；It can be mechanical connection, be also possible to be electrically connected；It can be directly connected, it can also be indirect by intermediary
It is connected, can be the connection inside two elements.For the ordinary skill in the art, on being understood with concrete condition
State the concrete meaning of term in the present invention.
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
Embodiment 1
A kind of dedicated radiator based on air source heat pump system as shown in Figs 1-4, including the heat pump room connected by pipeline 2
Outer machine 1, refrigerant converter 3, radiator ontology, indoor air conditioner 6, the interior circulation of pipeline 2 have heat transfer medium, and radiator ontology includes
Heat exchanger 4 is connected with cooling fin 7 on heat exchanger 4, and heat exchanger 4 includes the big water column radiator tank body 45 connecting with cooling fin 7,
Vacuum fluid reservoir and heating coil 48 are installed in big water column radiator tank body 45, heating coil 48 is in big water column radiator tank body
It exchanging heat in 45, vacuum fluid reservoir includes vacuum liquid storage tank 51, overflow pipe 53 is installed in vacuum liquid storage tank 51,
The top of vacuum liquid storage tank 51 is equipped with vacuum interface 52, and 52 are equipped with cooling gas check valve, vacuum interface in vacuum interface
The vacuum pump for adjusting pressure in radiator ontology, the vacuum interface 52 and vacuum of vacuum fluid reservoir are connected at 52
Pump is connected, and pressure control in heat exchanger 4 is reduced the vaporization of liquid in radiator ontology in -0.2 ~ 0.3Mpa by check valve
Point guarantees that water can smoothly realize circulation, heating when overflow pipe 53 is for adjusting temperature change in lower temperature (40 ~ 60 DEG C)
The liquid guide flow of stereomutation due to temperature change is entered or is exported vacuum fluid reservoir by pressure in piece ontology.
Big water column radiator tank body 45 is sealing container, and the left upper portion of big water column radiator tank body 45 is machined with suitable for reading connect
Mouth 43, the left lower of big water column radiator tank body are machined with lower mouth interface 47, add in interface 43 suitable for reading and lower mouth interface 47
Work has left hand thread, and interface 43 suitable for reading and lower mouth interface 47 are connect with cooling fin, the right side of big water column radiator tank body 45 with it is upper
It is mounted on blind plugging 40 at mouthful interface 43 and the opposite position of lower mouth interface 47, the right upper portion of big water column radiator tank body 45 adds
Work has heating tube inlet 44, and the lower right side of big water column radiator tank body, which is provided with, heats pipe outlet 49, in big water column radiator
Heating coil 48 is installed, heating coil 48 is connected in parallel by the copper pipe that 3 diameters are 6 millimeters and is formed, it is therefore an objective to promote heating
Heat exchange efficiency in coil pipe 48 between refrigerant and heat transfer medium, the both ends of heating coil 48 pass through a heating pipe and extend to flood
Outside column radiator 45, heating pipe and heating coil 48 use integrated design, and radiator ontology is the entirety of a sealing, installation
Simple and convenient, the optional range of installation site is wide, and recommendation is mounted below indoor unit or near windows, is conducive to indoor thermally equilibrated
Stable and comfort
Interface end, respectively interface end 31 there are four on refrigerant converter 3, interface end 32, interface end 33, interface end 34, wherein
To flow into pipe between interface end 31 and interface end 33, it is effuser between interface end 32 and interface end 34, flows into pipe and effuser
Between be also equipped with connecting tube, a diaphragm check valve 8, two diaphragm type non-returns are separately installed in connecting tube and effuser
It is connected between valve 8 by pipeline, interface end 31 and interface end 32 are connected in series between heat pump outdoor unit and indoor air conditioner
On connecting line, interface end 33 and interface end 34 connect with heating coil entrance 44, heating coil outlet 49 respectively, refrigerant conversion
Device 3 controls refrigerants flow direction by two diaphragm check valves 8, and refrigerant is blocked through diaphragm check valve 8 when heat supply in winter, is introduced into
Radiator ontology completes heat exchange, and refrigerant directly returns to outdoor unit, heat exchanger 4 after entering the room air conditioner cooling supply when summer cooling
It is short-circuited.
On radiator ontology heat tube inlet 44 be connected with the interface end 33 of refrigerant converter 3, then by with interface end 31
Connected connecting line 2 is connect with heat pump outdoor unit 1；The heating pipe outlet 49 of radiator ontology and the interface of refrigerant converter 3
End 34 is connected, then the connecting line 2 by being connected with refrigerant switching device interface end 32 is connect with the arrival end of air conditioner indoor unit 5,
The outlet end of indoor air conditioner 5 is connected by connecting line 2 with the arrival end of heat pump outdoor unit 1.
The refrigerant of refrigerant converter 3 enters in heating coil 48 through heating tube inlet 44, in big water column radiator tank body 45
Interior to exchange heat with heat transfer medium, the refrigerant after heat exchange is through 49 outflow of heating pipe outlet, while refrigerant is heating disk in order to prevent
Biggish noise and vibration are generated when flowing in pipe 48, therefore are wrapped in outside heating coil 48 using EVA noise reducing pipe, radiator
Intrinsic pressure is controlled by the vacuum interface 6 of vacuum fluid reservoir 2, to guarantee the normal circulation of heat transfer medium；Pass through overflow
Pipe 53 will be stored in vacuum fluid reservoir 2 because of the increased heat transfer medium of temperature rise volume.
Heat exchanger 4 is connected through interface 43 suitable for reading and lower mouth interface 47 with cooling fin 7；Heat transfer medium through lower mouth interface 47 into
Enter in big water column radiator tank body 45, is reentered in cooling fin after being heated by heating coil 48 from interface 43 suitable for reading, by temperature
Difference and density contrast complete circulation.
When heat supply in winter, heat pump outdoor unit 1, refrigerant converter 3, radiator ontology form heating system, heat pump outdoor unit 1
The refrigerant of the high temperature and pressure of output enters radiator ontology by refrigerant converter 3, completes to be situated between with heat transfer in radiator ontology
Connecting line 2 is flowed into after the heat exchange of matter, and is returned to heat pump outdoor unit 1 and completed heating cycle；When summer cooling, outdoor air-conditioner 1,
Refrigerant converter 3, indoor air conditioner 6 form original cold supply system, and radiator ontology is not involved in for SAPMAC method.
Finally, it should be noted that the foregoing is only a preferred embodiment of the present invention, it is not intended to restrict the invention,
Although the present invention is described in detail referring to the foregoing embodiments, for those skilled in the art, still may be used
To modify the technical solutions described in the foregoing embodiments or equivalent replacement of some of the technical features,
All within the spirits and principles of the present invention, any modification, equivalent replacement, improvement and so on should be included in of the invention
Within protection scope.
Claims (6)
1. a kind of dedicated radiator based on air source heat pump system, including heat pump outdoor unit, the Interior Space using pipeline connection
Tune machine, refrigerant converter and radiator, the interior circulation of the pipeline have heat transfer medium, it is characterised in that: the radiator includes changing
Hot device is connected with cooling fin on the heat exchanger, and the heat exchanger includes the big water column radiator tank body connecting with cooling fin, institute
It states and is provided with vacuum fluid reservoir and heating coil in big water column radiator tank body, the heating coil is in big water column radiator tank body
It exchanges heat, the vacuum fluid reservoir includes vacuum liquid storage tank, is provided with overflow pipe in the vacuum liquid storage tank, institute
The top for stating vacuum liquid storage tank is provided with vacuum interface, and cooling gas check valve, the vacuum are provided in the vacuum interface
Interface is connected with the vacuum pump for adjusting pressure in radiator ontology.
2. a kind of dedicated radiator based on air source heat pump system according to claim 1, it is characterised in that: described big
Water column radiator tank body is sealing container, and the left upper portion of the big water column radiator tank body is provided with that radiator ontology is suitable for reading to be connect
Mouthful, the left lower of the big water column radiator tank body is provided with lower mouth interface, is all provided in the interface suitable for reading and lower mouth interface
Be equipped with left hand thread, the interface suitable for reading and lower mouth interface are connect with cooling fin, the right side of the big water column radiator tank body with
Blind plugging, the right upper portion setting of the big water column radiator tank body are provided at interface suitable for reading and the opposite position of lower mouth interface
There is heating tube inlet, the lower right side of the big water column radiator tank body is provided with the outlet of heating pipe.
3. a kind of dedicated radiator based on air source heat pump system according to claim 1, it is characterised in that: the system
Hot coil is composed in parallel by the copper pipe that 3 diameters are 6 millimeters, and the inlet and exit of heating coil pass through a heating pipe
It extends to outside big water column radiator tank body.
4. a kind of dedicated radiator based on air source heat pump system according to claim 1, it is characterised in that: described cold
Matchmaker's installed in series is connected between heat pump outdoor unit and indoor air conditioner on pipeline, the inflow pipe of the refrigerant converter inside
It is additionally provided with connecting tube between effuser, is respectively arranged with a diaphragm check valve in the connecting tube and effuser, two
It is additionally provided with threeway before a diaphragm check valve, is connected between two threeways by pipeline.
5. a kind of dedicated radiator based on air source heat pump system according to claim 1, it is characterised in that: the biography
Thermal medium need to use pure water or radiator superconducting liquid.
6. a kind of dedicated radiator based on air source heat pump system according to claim 1, it is characterised in that: the system
It is provided with EVA noise reducing pipe outside hot coil, the EVA noise reducing pipe is wrapped in outside heating coil.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910474695.XA CN110094817A (en) | 2019-06-03 | 2019-06-03 | A kind of dedicated radiator based on air source heat pump system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910474695.XA CN110094817A (en) | 2019-06-03 | 2019-06-03 | A kind of dedicated radiator based on air source heat pump system |
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| Publication Number | Publication Date |
|---|---|
| CN110094817A true CN110094817A (en) | 2019-08-06 |
Family
ID=67450036
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910474695.XA Pending CN110094817A (en) | 2019-06-03 | 2019-06-03 | A kind of dedicated radiator based on air source heat pump system |
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| Country | Link |
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| CN (1) | CN110094817A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110645730A (en) * | 2019-09-29 | 2020-01-03 | 河南省建筑科学研究院有限公司 | Refrigerant control system and method for double-end heat pump heating air conditioning unit |
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| JP2005274134A (en) * | 2001-09-28 | 2005-10-06 | Mitsubishi Electric Corp | Heat pump type floor heating air conditioner |
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| CN202253924U (en) * | 2011-06-24 | 2012-05-30 | 卢国华 | Electric warming oven with vacuum valve |
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| CN106196698A (en) * | 2016-08-01 | 2016-12-07 | 北京工业大学 | A kind of directly condensation heating heat pump apparatus of air source of band radiator |
| CN209960684U (en) * | 2019-06-03 | 2020-01-17 | 郑州胜峰制冷科技有限公司 | Special radiator based on air source heat pump system |
-
2019
- 2019-06-03 CN CN201910474695.XA patent/CN110094817A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005274134A (en) * | 2001-09-28 | 2005-10-06 | Mitsubishi Electric Corp | Heat pump type floor heating air conditioner |
| CN1719112A (en) * | 2005-07-17 | 2006-01-11 | 刘忠林 | Vacuum superconductive medium heating radiator |
| CN202253924U (en) * | 2011-06-24 | 2012-05-30 | 卢国华 | Electric warming oven with vacuum valve |
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| CN205504945U (en) * | 2016-04-19 | 2016-08-24 | 山东豪迈机械制造有限公司 | Negative pressure balanced system and low pressure steam generating device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110645730A (en) * | 2019-09-29 | 2020-01-03 | 河南省建筑科学研究院有限公司 | Refrigerant control system and method for double-end heat pump heating air conditioning unit |
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