CN113175707B - Heat recovery air conditioning system and control method thereof - Google Patents
Heat recovery air conditioning system and control method thereof Download PDFInfo
- Publication number
- CN113175707B CN113175707B CN202110577157.0A CN202110577157A CN113175707B CN 113175707 B CN113175707 B CN 113175707B CN 202110577157 A CN202110577157 A CN 202110577157A CN 113175707 B CN113175707 B CN 113175707B
- Authority
- CN
- China
- Prior art keywords
- heat
- heat storage
- storage element
- state
- conditioning system
- Prior art date
- 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.)
- Active
Links
- 238000004378 air conditioning Methods 0.000 title claims abstract description 68
- 238000011084 recovery Methods 0.000 title claims abstract description 55
- 238000000034 method Methods 0.000 title claims abstract description 27
- 238000005338 heat storage Methods 0.000 claims abstract description 279
- 238000010438 heat treatment Methods 0.000 claims abstract description 56
- 238000001704 evaporation Methods 0.000 claims abstract description 28
- 230000008020 evaporation Effects 0.000 claims abstract description 26
- 238000006243 chemical reaction Methods 0.000 claims abstract description 6
- 239000007788 liquid Substances 0.000 claims description 79
- 239000003507 refrigerant Substances 0.000 claims description 75
- 238000001816 cooling Methods 0.000 claims description 12
- 239000012782 phase change material Substances 0.000 claims description 4
- 230000000694 effects Effects 0.000 description 10
- 238000009825 accumulation Methods 0.000 description 6
- 230000008569 process Effects 0.000 description 6
- 238000009833 condensation Methods 0.000 description 5
- 230000005494 condensation Effects 0.000 description 5
- 238000004891 communication Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 239000012530 fluid Substances 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000005057 refrigeration Methods 0.000 description 2
- 238000010257 thawing Methods 0.000 description 2
- 210000003437 trachea Anatomy 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F3/00—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems
- F24F3/06—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the arrangements for the supply of heat-exchange fluid for the subsequent treatment of primary air in the room units
- F24F3/065—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the arrangements for the supply of heat-exchange fluid for the subsequent treatment of primary air in the room units with a plurality of evaporators or condensers
-
- 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
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
- F24F11/41—Defrosting; Preventing freezing
- F24F11/42—Defrosting; Preventing freezing of outdoor units
-
- 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
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/64—Electronic processing using pre-stored data
-
- 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
-
- 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F12/00—Use of energy recovery systems in air conditioning, ventilation or screening
-
- 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
- F24F5/0017—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 using cold storage bodies, e.g. ice
- F24F5/0021—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 using cold storage bodies, e.g. ice using phase change material [PCM] for storage
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/56—Heat recovery units
-
- 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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/14—Thermal energy storage
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Physics & Mathematics (AREA)
- Fuzzy Systems (AREA)
- Mathematical Physics (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Air Conditioning Control Device (AREA)
Abstract
本公开涉及一种热回收空调系统及其控制方法，其中，热回收空调系统包括：室外机，用于实现热回收，室外机包括外机换热器；多个室内机；蓄热部件，与室内机并联且蓄热部件包括具有储热状态和放热状态的蓄热元件；模式转换部件，包括多个模式转换器对应设置，用于控制多个室内机和蓄热部件的工作状态，每个模式转换器具有第一连接管组和第二连接管组，模式转换器通过第一连接管组与室外机连接，并通过第二连接管组与蓄热部件或室内机连接；和控制器，用于在空调系统以制热模式运行时，使外机换热器与蓄热部件轮流作蒸发侧工作，且在外机换热器工作时蓄热元件处于储热状态，在蓄热元件处于放热状态时外机换热器停止工作。
The present disclosure relates to a heat recovery air conditioning system and a control method thereof, wherein the heat recovery air conditioning system comprises: an outdoor unit for realizing heat recovery, the outdoor unit comprising an outdoor heat exchanger; a plurality of indoor units; a heat storage component connected in parallel with the indoor unit and the heat storage component comprising a heat storage element having a heat storage state and a heat release state; a mode conversion component comprising a plurality of mode converters correspondingly arranged and used to control the working states of the plurality of indoor units and the heat storage component, each mode converter having a first connecting pipe group and a second connecting pipe group, the mode converter being connected to the outdoor unit through the first connecting pipe group, and being connected to the heat storage component or the indoor unit through the second connecting pipe group; and a controller for making the outdoor heat exchanger and the heat storage component work on the evaporation side in turn when the air conditioning system is operated in a heating mode, and the heat storage element being in a heat storage state when the outdoor heat exchanger is working, and the outdoor heat exchanger stopping working when the heat storage element is in a heat release state.
Description
Technical Field
The present disclosure relates to the field of air conditioning apparatuses, and in particular, to a heat recovery air conditioning system and a control method thereof.
Background
Along with the development of technology, people have higher requirements on the comfort of an air conditioner, and in the heating process of an air conditioning system, a refrigerant evaporates and absorbs heat in an external heat exchanger, so that frosting phenomenon can occur, and the heating quantity is reduced. Therefore, the defrosting process needs to be performed, the four-way valve is switched in the current defrosting method, the outdoor unit is switched to the condensing side, the indoor unit is switched to the evaporating side, the indoor environment temperature is reduced in the process, the heating effect of the air conditioning system is affected, and the comfort of a user is affected seriously.
Disclosure of Invention
The disclosure provides a heat recovery air conditioning system and a control method thereof, which can solve the problem of influencing the heating effect of the air conditioning system.
According to a first aspect of the present disclosure, there is provided a heat recovery air conditioning system comprising:
an outdoor unit configured to enable heat recovery, the outdoor unit including an outdoor unit heat exchanger;
the indoor units comprise an indoor unit heat exchanger;
A heat storage member disposed in parallel with each of the indoor units, the heat storage member including a heat storage element having a heat storage state and a heat release state;
a mode conversion part including a plurality of mode converters provided in one-to-one correspondence with the plurality of indoor units and the heat storage part, configured to control an operation state of the plurality of indoor units and the heat storage part, each mode converter having a first connection pipe group and a second connection pipe group, the mode converter being connected to the heat storage part or the indoor unit through the first connection pipe group and to the outdoor unit through the second connection pipe group; and
And a controller configured to cause the external heat exchanger and the heat storage member to alternately operate as an evaporation side when the heat recovery air conditioning system operates in a heating mode, to cause the heat storage element to be in a heat storage state when the external heat exchanger operates, and to cause the external heat exchanger to stop operating when the heat storage element is in a heat release state.
In some embodiments, the controller is configured to cause the heat storage element to stop heat storage and switch to the heat release state when a heat storage end condition is satisfied, and to stop heat release and switch to the heat storage state when a heat release end condition is satisfied.
In some embodiments, the first time required for the heat storage element to enter the heat storage state to end of heat storage is no greater than the second time required for the external heat exchanger to frost.
In some embodiments, the first connection pipe set includes a first gas pipe and a first liquid pipe, the first gas pipe is communicated with a gaseous refrigerant port of the heat exchanger or the heat storage element of the internal machine, the first liquid pipe is communicated with a liquid refrigerant port of the heat exchanger or the heat storage element of the internal machine, the plurality of indoor machines and the heat storage component each include a first throttling element, and the first throttling element is arranged on a pipeline where the first liquid pipe is communicated with the liquid refrigerant port of the heat exchanger or the heat storage element of the internal machine.
In some embodiments, the first connection tube set includes a first gas tube and a first liquid tube,
The heat storage member further includes: a first temperature sensor configured to detect a first temperature value of a pipe in which a liquid refrigerant port of the heat storage element communicates with the first liquid pipe; the controller is configured to judge that the heat storage of the heat storage element is finished under the condition that the first temperature value is higher than a first preset temperature value; and/or
The heat storage member further includes: a second temperature sensor configured to detect a second temperature value of a pipe in which a gaseous refrigerant port of the heat storage element communicates with the first gas pipe; the controller is configured to determine that the heat storage element is finished releasing heat when the second temperature value is lower than a second preset temperature value, and the second preset temperature value is lower than the first preset temperature value.
In some embodiments, the thermal storage element employs a phase change material configured to release heat when its temperature is higher than the temperature of the refrigerant flowing therethrough, and to absorb heat when its temperature is lower than the temperature of the refrigerant flowing therethrough.
In some embodiments, the second connection tube set comprises: the second liquid pipe, the second air pipe for low-pressure gas to flow and the third air pipe for high-pressure gas to flow.
In some embodiments, the first connection tube set includes a first fluid tube and a first gas tube, the first fluid tube in direct communication with a second fluid tube, each mode converter including:
At least one first on-off valve connected in parallel to form a first branch, and two ends of the first branch are respectively communicated with the first air pipe and the second air pipe; and
The second on-off valve and the second throttling element are connected in parallel to form a second branch, and two ends of the second branch are respectively communicated with the first air pipe and the third air pipe.
In some embodiments, the controller is configured to cause at least a portion of the first on-off valves in the respective mode converters to open and the second on-off valves and the second throttling element to close when the internal machine heat exchanger is in a cooling state or the heat storage element is in a heat release state; and when the internal heat exchanger is in a heating state or the heat storage element is in a heat storage state, the second on-off valve and the second throttling element in the corresponding mode converter are opened, and at least one first on-off valve is closed.
In some embodiments, the controller is configured to shut off the passage of the refrigerant flow to the thermal storage member when the heat recovery air conditioning system is operating in a mode other than the heating mode.
According to a second aspect of the present disclosure, there is provided a control method of a heat recovery air conditioning system based on the above embodiment, including:
when the heat recovery air conditioning system operates in a heating mode, the external machine heat exchanger and the heat storage part are made to work as an evaporation side in turn;
When the heat storage element is in a heat release state, the heat storage element stops working.
In some embodiments, after the heat recovery air conditioning system is started, the external machine heat exchanger is first operated as the evaporation side.
In some embodiments, the control method further comprises:
when the heat storage element is in a heat storage state, stopping heat storage when the heat storage element meets the heat storage ending condition, and switching to a heat release state;
when the heat storage element is in the heat release state, the heat storage element is caused to stop releasing heat when a condition for ending the heat release is satisfied, and is switched to the heat storage state.
In some embodiments, the first connection tube set includes a first gas tube and a first liquid tube,
Judging that the heat storage element satisfies the heat storage end condition includes:
A first temperature value of a pipeline, which is used for receiving the liquid refrigerant port of the heat storage component and is communicated with the first liquid pipe;
Judging that the heat storage element meets the heat storage ending condition under the condition that the first temperature value is higher than a first preset temperature value; or alternatively
Judging that the heat storage element satisfies the heat release end condition includes:
Receiving a second temperature value of a pipeline of the gaseous refrigerant port of the heat storage part communicated with the first gas pipe;
And stopping heat release of the heat storage element under the condition that the second temperature value is lower than the second preset temperature value, wherein the second preset temperature value is lower than the first preset temperature value.
In some embodiments, the first connection tube set comprises a first liquid tube and a first gas tube, and the second connection tube set comprises: the second liquid pipe, supply low-pressure gas flow's second trachea and high-pressure gas flow's third trachea, first liquid pipe and second liquid pipe direct communication, every mode converter all includes: at least one first on-off valve connected in parallel to form a first branch, and two ends of the first branch are respectively communicated with the first air pipe and the second air pipe; the second on-off valve and the second throttling element are connected in parallel to form a second branch, and two ends of the second branch are respectively communicated with the first air pipe and the third air pipe; wherein,
When the internal machine heat exchanger is in a refrigerating state or the heat storage element is in a heat release state, at least part of the first on-off valves in the corresponding mode converters are opened, and the second on-off valves and the second throttling element are closed;
When the internal heat exchanger is in a heating state or the heat storage element is in a heat storage state, the second on-off valve and the second throttling element in the corresponding mode converter are opened, and at least one first on-off valve is closed.
In some embodiments, the control method further comprises:
When the heat recovery air conditioning system is operated in a mode other than the heating mode, the passage of the refrigerant flowing to the heat storage member is shut off.
According to the heat recovery air conditioning system, the heat storage component is arranged in parallel with each indoor unit, the heat storage elements in the heat storage component are in the heat storage state and the heat release state, when the heat recovery air conditioning system operates in the heating mode, the heat storage elements are in the heat storage state when the external heat exchanger works, then the heat storage elements enter the heat release state, at the moment, the external heat exchanger stops working, the external heat exchanger and the heat storage component work as evaporation sides in turn, the external heat exchanger can be prevented from frosting due to long-time working, the air conditioning system can continuously heat, the heating effect can be guaranteed, and the comfort of a user is improved.
Drawings
In order to more clearly illustrate the embodiments of the present disclosure or the solutions in the prior art, the drawings that are required for the embodiments or the description of the prior art will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present disclosure, and that other drawings may be obtained according to these drawings without inventive faculty for a person skilled in the art.
Fig. 1 is a schematic diagram of some embodiments of a heat recovery air conditioning system of the present disclosure.
Fig. 2 is a schematic diagram of a connection relationship between a heat storage member and a plurality of indoor units in the heat recovery air conditioning system of the present disclosure.
Fig. 3 is a schematic view of the flow direction of the refrigerant when the heat storage element stores heat when the heat recovery system of the present disclosure is operated in the heating mode.
Fig. 4 is a schematic view of the flow direction of the refrigerant when the heat storage element releases heat when the heat recovery system of the present disclosure is operated in the heating mode.
Fig. 5 is a schematic diagram of some embodiments of a mode conversion component in a heat recovery system of the present disclosure.
Description of the reference numerals
1. An outdoor unit;
2. An indoor unit; 21. an internal machine heat exchanger; 22. a blower; 23. a first throttling element;
3. A heat storage member; 31. a heat storage element; 32. a first temperature sensor; 33. a second temperature sensor;
4. A mode converter; 41. a first air tube; 42. a first liquid pipe; 43. a second air pipe; 44. a second liquid pipe; 45. a third air pipe; 46. a first on-off valve; 47. a second on-off valve; 47', a second throttling element; 48. a heat exchanger; 49. a third throttling element; 49', a filter; 50. and a third temperature sensor.
Detailed Description
The following description of the technical solutions in the embodiments of the present disclosure will be made clearly and completely with reference to the accompanying drawings in the embodiments of the present disclosure, and it is apparent that the described embodiments are only some embodiments of the present disclosure, not all embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the disclosure, its application, or uses. Based on the embodiments in this disclosure, all other embodiments that a person of ordinary skill in the art would obtain without carrying out the inventive task are within the scope of protection of this disclosure.
Techniques, methods, and apparatus known to one of ordinary skill in the relevant art may not be discussed in detail, but are intended to be part of the specification where appropriate.
In the description of the present disclosure, it should be understood that the azimuth or positional relationships indicated by the azimuth terms such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal", and "top, bottom", etc., are generally based on the azimuth or positional relationships shown in the drawings, merely to facilitate description of the present disclosure and to simplify the description, and these azimuth terms do not indicate and imply that the apparatus or elements referred to must have a specific azimuth or be configured and operated in a specific azimuth, and thus should not be construed as limiting the scope of protection of the present disclosure; the orientation word "inner and outer" refers to inner and outer relative to the contour of the respective component itself.
In the description of the present disclosure, it should be understood that the use of terms such as "first," "second," etc. for defining components is merely for convenience in distinguishing corresponding components, and the terms are not meant to be construed as limiting the scope of the present disclosure unless otherwise indicated.
In some embodiments, the present disclosure provides a heat recovery air conditioning system, as shown in fig. 1, comprising, in some embodiments: the outdoor unit 1, the indoor unit assembly, the heat storage member, the mode conversion member, and the controller, and the indoor unit assembly includes a plurality of indoor units 2. Wherein:
The outdoor unit 1 is configured to enable heat recovery, and the outdoor unit 1 includes an outdoor heat exchanger. The indoor unit 2 includes an indoor unit heat exchanger 21. The heat storage member 3 is provided in parallel with each indoor unit 2, and the heat storage member 3 includes a heat storage element 31 having a heat storage state and a heat release state, and switching between the heat storage state and the heat release state is achieved by heat exchange between the heat storage element 31 and the refrigerant. The heat storage member 3 may be provided in the outdoor unit 1 or in an indoor unit assembly.
The mode conversion means includes a plurality of mode converters 4, which are provided in one-to-one correspondence with the plurality of indoor units 2 and the heat storage means 3, and are configured to control the operation states of the plurality of indoor units 2 and the heat storage means 3, the operation states of the indoor units 2 including a cooling state or a heating state, the plurality of indoor units 2 being allowed to be in different operation states at the same time, and the operation states of the heat storage means 3 including a heat storage state and a heat release state. Each of the mode converters 4 has a first connection tube group and a second connection tube group, and the mode converter 4 is connected to the heat storage member 3 or the indoor unit 2 through the first connection tube group and to the outdoor unit 1 through the second connection tube group. The plurality of mode converters 4 may be provided independently or may be provided integrally. The mode switching part may be provided in the outdoor unit 1 or in the indoor unit assembly.
The controller is configured to operate the external heat exchanger and the heat storage member 3 alternately as the evaporation side when the heat recovery air conditioning system is operated in the heating mode, and to put the heat storage element 31 in the heat storage state when the external heat exchanger is operated, and to put the external heat exchanger out of operation when the heat storage element 31 is in the heat release state.
When each indoor unit 2 is in a heating state, or the working states of a plurality of indoor units 2 are different, and the heating requirement is greater than the refrigerating requirement, the heat recovery air conditioning system operates in a heating mode, and the outdoor unit heat exchanger works as an evaporation side. After the heat recovery air conditioning system is started, the external heat exchanger is operated as an evaporation side to store heat in the heat storage element 31.
According to the heat recovery air conditioning system, the heat storage component is arranged in parallel with each indoor unit, the heat storage elements in the heat storage components are in the heat storage state and the heat release state, when the heat recovery air conditioning system operates in the heating mode, the heat storage elements are in the heat storage state when the external heat exchanger works, then the heat storage elements enter the heat release state, at the moment, the external heat exchanger stops working, the external heat exchanger and the heat storage components alternately work as evaporation sides in turn, the external heat exchanger can be prevented from frosting due to long-time working, the air conditioning system can continuously heat, the heating effect can be guaranteed, and the comfort of a user is improved.
In some embodiments, the controller is configured to cause the heat storage element 31 to stop heat storage and switch to the heat release state when the heat storage end condition is satisfied, and to stop heat release and switch to the heat storage state when the heat release end condition is satisfied.
After the air conditioning system is started, firstly, the external heat exchanger is made to work as an evaporation side, at the moment, the heat storage element 31 stores heat, and when the heat storage part 3 meets the heat storage ending condition, the heat storage of the heat storage element 31 is stopped through the corresponding mode converter 4; then, the heat storage element 31 is brought into a heat release state by the mode converter 4, and the external heat exchanger is stopped, and at this time, the heat storage member 3 performs heat exchange as an evaporation side, and after the heat storage member 3 satisfies the heat release end condition, the external heat exchanger is turned on, and the heat storage member 3 stops releasing heat and enters a heat storage state again. By alternately working the external heat exchanger and the heat storage component 3 as evaporation sides, continuous heating of the indoor unit can be realized, and the outdoor unit 1 is not frosted in the heating process, so that the heating effect of the air conditioning system can be improved, and the comfort requirement of a user can be met.
This embodiment enables the heat storage element 31 to be automatically switched between the heat storage state and the heat release state by presetting the heat storage end condition and the heat release end condition, so that the heat recovery air conditioning system continues to heat. The heat storage element 31 is in a heat release state when heat storage is finished, so that the working time of the external heat exchanger can be reduced as much as possible, and frosting of the external heat exchanger is prevented; when the heat storage element 31 is in a heat storage state while the heat release of the heat storage element 31 is finished, the heat exchanger of the external machine can be started to work as soon as possible when the heat storage element 31 cannot maintain the heat required by the heating of the system, the air conditioning system can continuously heat, and the heating effect is improved.
In some embodiments, the first time required for the heat storage element 31 from entering the heat storage state to the end of heat storage is no greater than the second time required for the external heat exchanger to frost.
The embodiment can ensure that the heat exchanger of the external machine is not frosted so as to improve the energy efficiency of the air conditioning system. For example, when the heat storage amount of the heat storage element 31 reaches the maximum allowable heat storage amount, the heat storage is ended, and thus it is necessary to select the heat storage element 31 having a high heat storage efficiency.
In some embodiments, as shown in fig. 2, the first connection pipe group includes a first gas pipe 41 and a first liquid pipe 42, the first gas pipe 41 communicates with the gaseous refrigerant port of the internal heat exchanger 21 or the heat storage element 31, the first liquid pipe 42 communicates with the liquid refrigerant port of the internal heat exchanger 21 or the heat storage element 31, the plurality of internal heat exchangers 2 and the heat storage member 3 each include the first throttling element 23, and the first throttling element 23 is provided on a pipe line in which the first liquid pipe 42 communicates with the liquid refrigerant port of the internal heat exchanger 21 or the heat storage element 31. The first throttling element 23 is used for throttling and depressurizing the liquid refrigerant flowing in the first liquid pipe 42 to become a low-temperature low-pressure liquid refrigerant, which is beneficial to refrigerant evaporation.
As shown in fig. 3, when the heat storage element 31 and the heat storage state are operated, the refrigerant flows in from the first gas pipe 41, and after heat is released by condensation in the heat storage element 31, the refrigerant flows out from the first liquid pipe 42. When the indoor unit 2 is operated in a heating state (the bottommost indoor unit 2 in fig. 3 and 4), the refrigerant flows in from the first gas pipe 41, condenses in the indoor unit heat exchanger 21, releases heat, and flows out from the first liquid pipe 42.
As shown in fig. 4, when the heat storage element 31 and the heat release state are operated, the refrigerant flows in from the first liquid pipe 42, evaporates and absorbs heat in the heat storage element 31, and flows out from the first gas pipe 41. When the indoor unit 2 is operated in a cooling state (the indoor unit 2 in the middle of fig. 3 and 4), the refrigerant flows in from the first liquid pipe 42, evaporates and absorbs heat in the indoor unit heat exchanger 21, and flows out from the first gas pipe 41.
In order to improve the heat exchange effect of the indoor unit heat exchanger 21, the indoor unit 2 further includes a plurality of fans 22, and the plurality of fans 22 are disposed corresponding to the plurality of indoor unit heat exchangers 21.
In some embodiments, the first connection tube set includes a first gas tube 41 and a first liquid tube 42. As shown in fig. 2, the heat storage member 3 may further include: a first temperature sensor 32, such as a bulb, configured to detect a first temperature value of a pipe in which a liquid refrigerant port of the heat storage element 31 communicates with the first liquid pipe 42; wherein the controller is configured to determine that the heat storage of the heat storage element 31 is ended in the case where the first temperature value is higher than the first preset temperature value.
As shown in fig. 2, the heat storage member 3 may further include: a second temperature sensor 33, such as a bulb, configured to detect a second temperature value of a pipe in which the gaseous refrigerant port of the heat storage element 31 communicates with the first gas pipe 41; wherein the controller is configured to determine that the heat storage element 31 is finished releasing heat in the case where the second temperature value is lower than the second preset temperature value. The second preset temperature value is lower than the first preset temperature value.
The embodiment can accurately judge the timing of the heat accumulation end and the heat release end of the heat accumulation element 31 so as to continuously switch between the heat accumulation state and the heat release state to ensure continuous heating operation of the air conditioning system.
In some embodiments, the heat storage element 31 is made of a phase change material, and is configured to absorb heat and release heat when its temperature is higher than the temperature of the refrigerant flowing therethrough, and absorb heat when its temperature is lower than the temperature of the refrigerant flowing therethrough. The phase change material has the ability to change its physical state over a range of temperatures, and materials that achieve phase change in the prior art can be used to fabricate the thermal storage element 31. The operating state of the heat storage element 31 can be controlled by the corresponding mode converter 4.
In some embodiments, as shown in fig. 1, the second connecting tube set comprises: a second liquid pipe 44, a second gas pipe 43 through which low pressure gas flows, and a third gas pipe 45 through which high pressure gas flows. Thus, the outdoor unit 1 can realize the three-pipe heat recovery function. The three-pipe heat recovery system can simultaneously realize that different air-conditioning rooms are in different heat exchange states, for example, the indoor unit 2 of the room A is in a refrigerating state, and the indoor unit 2 of the room B is in a heating state.
In some embodiments, as shown in fig. 5, the first connection pipe group includes a first liquid pipe 42 and a first gas pipe 41, the first liquid pipe 42 is in direct communication with a second liquid pipe 44, and each mode converter 4 includes: at least one first on-off valve 46, for example, a solenoid valve, which is connected in parallel to form a first branch in the case of including a plurality of first on-off valves 46, both ends of the first branch being respectively communicated with the first air pipe 41 and the second air pipe 43; and a second on-off valve 47 and a second throttling element 47' connected in parallel to form a second branch, both ends of the second branch being respectively communicated with the first air pipe 41 and the third air pipe 45.
In some embodiments, the controller is configured to cause at least a portion of the first on-off valve 46 in the respective mode converter 4 to open and the second on-off valve 47 and the second throttling element 47' to close when the internal machine heat exchanger 21 is in a cooling state or the heat storage element 31 is in a heat release state (equivalent to a cooling process). The liquid refrigerant enters the mode converter 4 from the outdoor unit 1 through the second liquid pipe 44, enters the heat exchanger 21 or the heat storage element 31 for evaporation heat exchange after being throttled and cooled by the first liquid pipe 42 through the first throttling element 23 in the indoor unit 2 or the heat storage component 3, and enters the outdoor unit 1 after heat exchange through the opened first on-off valve 46 and returns to the second air pipe 43.
For example, when the flow rate of the liquid refrigerant entering the first liquid pipe 42 is large, a plurality of first on-off valves 46 may be provided, and the number of the first on-off valves 46 to be opened may be selected according to the flow rate of the liquid refrigerant.
Further, the controller is configured to cause the second on-off valve 47 and the second throttle element 47' in the corresponding mode converter 4 to be opened and at least one of the first on-off valves 46 to be closed when the internal heat exchanger 21 is in a heating state or the heat storage element 31 is in a heat storage state (equivalent to a heating process). The high-temperature high-pressure gaseous refrigerant provided by the outdoor unit 1 sequentially passes through the third air pipe 45, the second branch and the first air pipe 41 through which the high-pressure gas flows, and enters the indoor unit heat exchanger 21 or the heat storage element 31 to perform condensation heat exchange, and the liquid refrigerant after heat exchange sequentially passes through the first liquid pipe 42 and the second liquid pipe 44 and returns to the outdoor unit 1. Since the high-pressure gas is passed through the second branch, the gas can be depressurized by providing the second shut-off valve 47 in parallel with the second throttling element 47'.
Thus, the control modes of the indoor unit 2 and the heat storage member 3 are identical.
Further, the mode switching means further includes a third throttling element 49 and a filter 49', each mode switch 4 further includes a heat exchanger 48, the heat exchanger 48 has a first heat exchange flow path and a second heat exchange flow path, both ends of the first heat exchange flow path are respectively communicated with the first liquid pipe 42 and the second liquid pipe 44, the first end of the second heat exchange flow path is communicated with the second air pipe 43, and a third temperature sensor 50 is provided on the communicating pipe, and the second end of the second heat exchange flow path is communicated with the second liquid pipe 44 after passing through the third throttling element 49 and the filter 49' in sequence.
In this embodiment, the liquid refrigerant entering the first liquid pipe 42 can be supercooled by adopting the third throttling element 49 to throttle and cool part of the liquid refrigerant in the second liquid pipe 44, so as to improve the heat exchange effect in the indoor unit 2 or the heat storage component 3. The opening degree of the third throttling element 49 is adjustable by the detection value of the third temperature sensor 50.
In some embodiments, the controller is configured to shut off the passage of the refrigerant flow to the heat storage member 3 when the heat recovery air conditioning system is operating in a mode other than the heating mode. For example, the shut-off of the flow of the refrigerant to the heat storage member 3 may be achieved by a mode switching member or an additionally provided on-off valve.
Therefore, the heat storage component 3 only plays a role when the air conditioning system operates in a heating mode, can be closed in other modes, is flexible to use, can meet the continuous heating requirement of the air conditioning system, and does not affect other working modes.
The method of operation of the heat recovery air conditioning system of the present disclosure is described by way of one specific embodiment with reference to fig. 1-5.
When all the indoor units 2 are required to be heated or the heating requirements of a plurality of indoor units 2 are greater than the cooling requirements, the air conditioning system operates in a heating mode, the outdoor unit 1 serves as an evaporator, and the heat storage part 3 performs heat storage and heat release processes. In other mode operation, the refrigerant is controlled not to flow through the heat storage member 3 by the mode switching member.
After the air conditioning system is started, the heat storage element 31 works in a heat storage state, when the heat storage stopping condition is met, the heat storage element 31 stops heat storage and enters a heat release process, at the moment, the external heat exchanger stops working, when the heat storage element 31 meets the heat release stopping condition, the heat storage element 31 stops heat release and enters the heat storage process, and the external heat exchanger starts working and works in turn.
When the heat storage element 31 is in a heat storage state, the refrigerant flows as follows:
The high-temperature high-pressure refrigerant vapor compressed by the compressor of the outdoor unit 1 is divided into two paths, the first path of refrigerant enters the indoor unit 2 with the heating requirement through the third air pipe 45, condensation heat exchange is carried out in the indoor unit heat exchanger 21, part of refrigerant liquid after heat exchange returns to the outdoor unit heat exchanger for evaporation, then returns to the compressor, the other part of refrigerant liquid enters the indoor unit heat exchanger with the refrigerating requirement for evaporation and heat absorption, and returns to the outdoor unit 1 through the second air pipe 43 after heat exchange, and if no refrigerating requirement exists, all refrigerant liquid after heat exchange returns to the outdoor unit heat exchanger for evaporation; the second path enters the heat storage part 3 through the third air pipe 45 to be cooled and condensed, heat is provided for the heat storage part 3, the refrigerant liquid after heat exchange enters the first liquid pipe 42, one part of the refrigerant liquid enters the outer machine heat exchanger to be evaporated, then the refrigerant returns to the compressor, the other part of the refrigerant enters the indoor machine 2 with the refrigeration requirement, the refrigerant returns to the system of the outdoor machine 1 through the second air pipe 43 after evaporating and absorbing heat in the inner machine heat exchanger 21, and if no refrigeration requirement exists, the refrigerant after heat exchange of the heat storage part 3 completely enters the outdoor machine 1.
When the heat storage member 3 is in an exothermic state, the refrigerant flows as follows:
After being compressed into high-temperature high-pressure refrigerant steam by a compressor in the outdoor unit 1, the refrigerant enters the indoor unit 2 with the heating requirement by the third air pipe 45, after condensation and heat exchange are carried out on the refrigerant in the indoor unit 2 with the heating requirement, part of the refrigerant enters the heat storage component 3 for evaporation, the evaporated refrigerant steam returns to the compressor by the second air pipe 43, the other part of the refrigerant enters the indoor unit 2 with the cooling requirement for evaporation, the refrigerant returns to the outdoor unit 1 by the second air pipe 43, and if the indoor unit 2 without the cooling requirement is arranged, all the refrigerant after cooling and condensation enters the heat storage component 3 for evaporation and heat absorption.
Next, the present disclosure provides a control method of a heat recovery air conditioning system based on the above embodiments, including, in some embodiments:
When the heat recovery air conditioning system is operated in a heating mode, the external heat exchanger and the heat storage member 3 are made to work alternately as an evaporation side;
The heat storage element 31 is put in a heat storage state when the external heat exchanger is operated, and the external heat exchanger is stopped when the heat storage element 31 is put in a heat release state.
According to the embodiment, when the heat recovery air conditioning system operates in a heating mode, the heat storage element is in a heat storage state when the external heat exchanger works, then the heat storage element is in a heat release state, at the moment, the external heat exchanger stops working, and the external heat exchanger and the heat storage part alternately work as an evaporation side in turn, so that frosting of the external heat exchanger due to long-time working can be prevented, the air conditioning system can continuously heat, the heating effect can be guaranteed, and the comfort of a user is improved.
In some embodiments, after the heat recovery air conditioning system is started, the external machine heat exchanger is first operated as the evaporation side. This way, heat can be stored for the heat storage element 31 by the operation of the external heat exchanger for subsequent heat release.
In some embodiments, the control method of the present disclosure further comprises:
When the heat storage element 31 is in the heat storage state, the heat storage element 31 is caused to stop heat storage and switch to the heat release state when the condition for ending the heat storage is satisfied;
When the heat storage element 31 is in the heat release state, the heat storage element 31 is caused to stop releasing heat when the condition for ending the heat release is satisfied, and is switched to the heat storage state.
This embodiment enables the heat storage element 31 to be automatically switched between the heat storage state and the heat release state by presetting the heat storage end condition and the heat release end condition, so that the heat recovery air conditioning system continues to heat. The heat storage element 31 is in a heat release state when heat storage is finished, so that the working time of the external heat exchanger can be reduced as much as possible, and frosting of the external heat exchanger is prevented; when the heat storage element 31 is in a heat storage state while the heat release of the heat storage element 31 is finished, the heat exchanger of the external machine can be started to work as soon as possible when the heat storage element 31 cannot maintain the heat required by the heating of the system, the air conditioning system can continuously heat, and the heating effect is improved.
In some embodiments, the first connection pipe group includes a first gas pipe 41 and a first liquid pipe 42, and determining that the heat storage element 31 satisfies the heat storage end condition includes:
a first temperature value of a pipe line that receives the liquid refrigerant port of the heat storage member 3 and communicates with the first liquid pipe 42, for example, the temperature value may be detected by providing the first temperature sensor 32;
in the case where the first temperature value is higher than the first preset temperature value, it is determined that the heat storage element 31 satisfies the heat storage end condition.
In some embodiments, the first connection pipe group includes the first gas pipe 41 and the first liquid pipe 42, and determining that the heat storage element 31 satisfies the heat release end condition includes:
a second temperature value of a pipeline in which a gaseous refrigerant port of the heat storage member 3 is communicated with the first gas pipe 41;
in the case where the second temperature value is lower than the second preset temperature value, which is lower than the first preset temperature value, the heat storage element 31 is stopped from releasing heat.
The embodiment can accurately judge the timing of the heat accumulation end and the heat release end of the heat accumulation element 31 so as to continuously switch between the heat accumulation state and the heat release state to ensure continuous heating operation of the air conditioning system.
In some embodiments, the first connection tube set comprises a first liquid tube 42 and a first gas tube 41, and the second connection tube set comprises: a second liquid pipe 44, a second gas pipe 43 through which low pressure gas flows, and a third gas pipe 45 through which high pressure gas flows, the first liquid pipe 42 being in direct communication with the second liquid pipe 44, each mode converter 4 including: at least one first on-off valve 46 connected in parallel to form a first branch, and two ends of the first branch are respectively communicated with the first air pipe 41 and the second air pipe 43; and a second on-off valve 47 and a second throttling element 47' connected in parallel to form a second branch, both ends of the second branch being respectively communicated with the first air pipe 41 and the third air pipe 45; wherein,
When the internal machine heat exchanger 21 is in a cooling state or the heat storage element 31 is in a heat release state, at least part of the first on-off valve 46 in the corresponding mode converter 4 is opened, and the second on-off valve 47 and the second throttling element 47' are closed;
When the internal heat exchanger 21 is in a heating state or the heat storage element 31 is in a heat storage state, the second on-off valve 47 and the second throttle element 47' in the corresponding mode converter 4 are opened, and at least one of the first on-off valves 46 is closed.
In some embodiments, the control method of the present disclosure further comprises:
when the heat recovery air conditioning system is operated in a mode other than the heating mode, the passage of the refrigerant to the heat storage member 3 is shut off.
The heat storage member 3 of the present disclosure only functions when the air conditioning system is operating in the heating mode, and is closable in other modes, flexible in use, and capable of satisfying the continuous heating requirement of the air conditioning system without affecting other operation modes.
In addition, technical features related to different embodiments of the present disclosure described below may be combined with each other as long as they do not make a conflict with each other.
In some embodiments, the controller described above may be a general purpose Processor, programmable logic controller (Programmable Logic Controller, abbreviated as PLC), digital signal Processor (DIGITAL SIGNAL Processor, abbreviated as DSP), application Specific Integrated Circuit (ASIC), field-Programmable gate array (Field-Programmable GATE ARRAY, abbreviated as FPGA), or other Programmable logic device, discrete gate or transistor logic device, discrete hardware components, or any suitable combination thereof for performing the functions described in the present disclosure.
The foregoing description of the exemplary embodiments of the present disclosure is not intended to limit the present disclosure, but rather, any modifications, equivalents, improvements, etc. that fall within the spirit and principles of the present disclosure are intended to be included within the scope of the present disclosure.
Claims (14)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110577157.0A CN113175707B (en) | 2021-05-26 | 2021-05-26 | Heat recovery air conditioning system and control method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110577157.0A CN113175707B (en) | 2021-05-26 | 2021-05-26 | Heat recovery air conditioning system and control method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113175707A CN113175707A (en) | 2021-07-27 |
| CN113175707B true CN113175707B (en) | 2024-11-22 |
Family
ID=76927077
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110577157.0A Active CN113175707B (en) | 2021-05-26 | 2021-05-26 | Heat recovery air conditioning system and control method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113175707B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115682314B (en) * | 2022-11-15 | 2024-08-16 | 珠海格力电器股份有限公司 | Control method for air conditioning system, air conditioning system and storage medium |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN214791579U (en) * | 2021-05-26 | 2021-11-19 | 珠海格力电器股份有限公司 | Heat recovery air conditioning system |
Family Cites Families (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2748960B2 (en) * | 1989-08-31 | 1998-05-13 | 松下冷機株式会社 | Thermal storage air conditioning system |
| JP2753177B2 (en) * | 1992-04-30 | 1998-05-18 | 松下精工株式会社 | Heat recovery type multi air conditioner |
| JP3289224B2 (en) * | 1992-11-06 | 2002-06-04 | 株式会社日立製作所 | Air conditioner with heat storage |
| JP2000291985A (en) * | 1999-04-07 | 2000-10-20 | Daikin Ind Ltd | Air conditioner |
| JP2007198730A (en) * | 2007-03-20 | 2007-08-09 | Sanyo Electric Co Ltd | Air conditioning refrigeration device |
| JP2010286144A (en) * | 2009-06-10 | 2010-12-24 | Toyox Co Ltd | Heat storage type hot water supply air-conditioning system |
| CN203907772U (en) * | 2014-04-22 | 2014-10-29 | 珠海格力电器股份有限公司 | Air conditioning system with defrosting function |
| CN104456736A (en) * | 2014-12-12 | 2015-03-25 | 珠海格力电器股份有限公司 | Air conditioner, heat storage device, and control method for air conditioner |
| JP2016125724A (en) * | 2014-12-26 | 2016-07-11 | ダイキン工業株式会社 | Thermal storage air conditioner |
| EP3244141A1 (en) * | 2016-05-09 | 2017-11-15 | Vaillant GmbH | Defrosting with heat generated by compressor driver |
| CN108709336B (en) * | 2018-08-21 | 2024-03-08 | 广东美的暖通设备有限公司 | Heat pump system and air conditioner |
| JP6729653B2 (en) * | 2018-09-28 | 2020-07-22 | ダイキン工業株式会社 | Air conditioning system |
| CN110645745A (en) * | 2019-10-23 | 2020-01-03 | 珠海格力电器股份有限公司 | Air conditioner capable of continuously heating and control method thereof |
| CN112728800A (en) * | 2019-10-28 | 2021-04-30 | 广东美的制冷设备有限公司 | Air conditioner |
| CN111457466B (en) * | 2020-02-14 | 2021-08-10 | 青岛海信日立空调系统有限公司 | Air conditioning equipment |
| CN112594824B (en) * | 2021-01-25 | 2022-06-21 | 广东积微科技有限公司 | Non-stop defrosting multi-online hot water system and control method thereof |
-
2021
- 2021-05-26 CN CN202110577157.0A patent/CN113175707B/en active Active
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN214791579U (en) * | 2021-05-26 | 2021-11-19 | 珠海格力电器股份有限公司 | Heat recovery air conditioning system |
Also Published As
| Publication number | Publication date |
|---|---|
| CN113175707A (en) | 2021-07-27 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN211739592U (en) | Air conditioning system capable of continuously heating | |
| CN203907772U (en) | Air conditioning system with defrosting function | |
| CN100592007C (en) | An air source heat pump air conditioner and defrosting method thereof | |
| WO2015188656A1 (en) | Two-stage compression air conditioning system and control method thereof | |
| CN103983037B (en) | Take doublestage compression air conditioning system of defrosting function | |
| CN201535589U (en) | Heat pump air-conditioning system | |
| CN102721149A (en) | Air conditioner and control method thereof | |
| WO2019091240A1 (en) | Heating circulation system for air conditioning, and air conditioner | |
| JPH04295568A (en) | air conditioner | |
| WO2022110771A1 (en) | Air conditioner | |
| CN110173941A (en) | air conditioning system | |
| CN109654764A (en) | A kind of two-stage enthalpy increasing system and its defrosting control method | |
| JP5218107B2 (en) | Refrigeration air conditioner | |
| CN204063308U (en) | Air conditioning system | |
| CN113175707B (en) | Heat recovery air conditioning system and control method thereof | |
| CN112728800A (en) | Air conditioner | |
| CN214791579U (en) | Heat recovery air conditioning system | |
| CN108709336B (en) | Heat pump system and air conditioner | |
| JP6982692B2 (en) | Air conditioner system | |
| CN216693810U (en) | Air Conditioning System | |
| CN112013474A (en) | Air conditioner and control method thereof | |
| CN204555463U (en) | air conditioner | |
| JP2006029738A (en) | Heat storage type air conditioner | |
| CN206019070U (en) | Heat exchanger, air condensing units, heat pump system and air conditioner | |
| CN222068667U (en) | Air conditioner |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |