CN117308280A - Single-opening heating control method for multi-split air conditioning system - Google Patents
Single-opening heating control method for multi-split air conditioning system Download PDFInfo
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- CN117308280A CN117308280A CN202311409236.6A CN202311409236A CN117308280A CN 117308280 A CN117308280 A CN 117308280A CN 202311409236 A CN202311409236 A CN 202311409236A CN 117308280 A CN117308280 A CN 117308280A
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- 238000010438 heat treatment Methods 0.000 title claims abstract description 51
- 238000000034 method Methods 0.000 title claims abstract description 38
- 238000004378 air conditioning Methods 0.000 title claims abstract description 23
- 239000007788 liquid Substances 0.000 claims abstract description 18
- 238000010257 thawing Methods 0.000 claims abstract description 14
- 238000004781 supercooling Methods 0.000 claims description 21
- 238000001514 detection method Methods 0.000 claims description 4
- 239000003507 refrigerant Substances 0.000 abstract description 12
- 230000000694 effects Effects 0.000 abstract description 5
- 230000000630 rising effect Effects 0.000 abstract 1
- 230000001105 regulatory effect Effects 0.000 description 4
- 238000001816 cooling Methods 0.000 description 3
- 238000000926 separation method Methods 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/30—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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/50—Control or safety arrangements characterised by user interfaces or communication
- F24F11/61—Control or safety arrangements characterised by user interfaces or communication using timers
-
- 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
- F24F11/62—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
- F24F11/65—Electronic processing for selecting an operating mode
-
- 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
- F24F11/84—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 using valves
-
- 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
- F24F11/88—Electrical aspects, e.g. circuits
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2140/00—Control inputs relating to system states
- F24F2140/20—Heat-exchange fluid temperature
Abstract
The invention relates to a single-opening heating control method of a multi-split air conditioning system, when an internal unit is restarted after defrosting, the single-opening heating control method firstly controls the single-opening heating control method to enter a normal control method for adjustment according to preset conditions according to a larger opening (half of the maximum opening) exceeding a set opening adjustment range, and under the normal control, the opening of a standby internal unit is between a second preset opening and a first preset opening. The method can improve the high pressure of the system, increase the circulation flow of the refrigerant, accelerate the speed of the single-opening heating effect, avoid the risk of liquid return of the compressor, and reduce the increase of power consumption caused by invalid frequency rising.
Description
Technical Field
The invention relates to the technical field of multi-split air conditioning systems, in particular to a single-opening heating control method of a multi-split air conditioning system.
Background
A multi-split air conditioning system is a system that can connect a plurality of indoor units to one single outdoor unit, and is generally used for cooling and heating air conditioning of a plurality of rooms or areas. In low ambient temperature conditions, a smaller number of indoor units will typically be selected because they are more suitable for operation under these conditions. Smaller numbers of indoor units generally operate more efficiently under low load conditions because they better match the indoor needs in low temperature environments.
When the multi-split indoor unit (1P) heats at a low-ring temperature and single-split minimum indoor unit, the standby opening is always set to be a certain interval (50-70) on the basis of the existing indoor unit standby valve step control in the market, and the range is smaller, so that the refrigerant flow is too small after the unit is defrosted, the high-pressure lifting speed is lower, and the heating effect of the opened indoor unit is poor. And at low high pressures, the system will increase in frequency (boost high pressure), resulting in increased energy consumption. Meanwhile, if the opening of the standby valve is kept large for a long time when the unit is operated, the risk of liquid return of the compressor can occur, and the compressor is damaged.
Disclosure of Invention
In order to solve the problems, the invention aims to provide a single-opening heating control method of a multi-split air conditioning system, which can improve the single-opening effect of multi-split machine heating and save electricity.
The method is used in a multi-split air conditioning system, the multi-split air conditioning system comprises a heating operation mode, a defrosting operation mode and a refrigerating operation mode, an internal unit is restarted to the heating operation mode after defrosting, the single-split minimum internal unit operates in the heating operation mode, and the opening of an internal unit valve in a standby state is adjusted in the starting process according to the following method:
opening the opening of the inner machine in the standby state to half of the maximum opening of the inner machine, and simultaneously detecting the exhaust temperature Tda of the compressor, the temperature Teo of an inner machine air pipe of a heating standby air conditioner, the temperature Teo1 of the inner machine air pipe of a heating starting air conditioner, the return air temperature TS, the low-pressure saturation temperature PS-t and the temperature Tei1 of a starting liquid pipe in the restarting heating operation process;
after the heating restarting operation, if any one of the following conditions is met, the opening of the valve to be built-in machine is adjusted according to a common control method:
condition one: the difference between the exhaust temperature Tda of the compressor and the temperature Teo of an air pipe of the air conditioner in heating standby is lower than a first preset temperature;
condition II: the difference between the exhaust temperature Tda of the compressor and the temperature Teo1 of an air pipe in the heating startup air conditioner is lower than a second preset temperature;
and (3) a third condition: the air return temperature TS and the low-pressure saturation temperature PS-t are the air return superheat degree, and the air return superheat degree is lower than a third preset temperature;
condition four: the continuous running time of the compressor exceeds a first preset time;
wherein the second preset temperature is lower than the first preset temperature;
the general control method includes:
and the opening of the standby internal machine is reduced to a first preset opening, then the opening of the standby internal machine is regulated according to the supercooling degree T, and the regulating range of the opening of the standby internal machine is between a second preset opening and the first preset opening, wherein the second preset opening is smaller than the first preset opening.
Preferably, the adjusting the opening of the standby internal unit according to the supercooling degree includes:
when the T supercooling degree is smaller than the fourth preset temperature, the valve of the standby internal machine is closed, the detection is carried out once every preset time interval, the number of each adjusting step is a, and the minimum opening is the second preset opening;
when the fourth preset temperature is less than or equal to T and the supercooling degree is less than or equal to the fifth preset temperature, the opening of the standby internal machine valve is unchanged;
when the T supercooling degree is more than or equal to the fifth preset temperature, the standby internal machine valve is opened, the detection is carried out once every preset time interval, the number of each adjusting step is a, and the maximum opening is the first preset opening.
Preferably, the T supercooling degree=the high pressure saturation temperature pd-T-standby liquid pipe temperature Tei,
the high-pressure saturation temperature Pd-t is calculated through the weight of the inlet and outlet temperatures of the internal machine, and the formula is as follows:
high-pressure saturation temperature Pd-t= (starting air pipe temperature Teo1+starting liquid pipe temperature Tei 1)/2.3/n, wherein n is the number of internal machines in starting.
Preferably, in the first condition, it is further required that the difference between Tda and Teo is lower than the first preset temperature for a preset time; in the second condition, it is further required to satisfy that the difference between Tda and Teo1 is lower than the second preset temperature for a preset time.
According to the scheme, when the internal machine is restarted after defrosting, the internal machine is firstly controlled to enter a normal control method according to a larger opening (half of the maximum opening) beyond the set opening adjusting range, then the internal machine is controlled to enter the normal control method according to the preset condition to be adjusted, under the normal control, the opening of the internal machine is in standby between a second preset opening and a first preset opening, and the second preset opening is smaller than the first preset opening and is smaller than the half of the maximum opening.
Drawings
Fig. 1 is a schematic diagram of a system structure of the present application.
Reference numerals:
the device comprises a compressor 1, a four-way valve 2, an external heat exchanger 3, an electronic expansion valve 4, a flash tank 5 and an internal machine 6.
Detailed Description
Embodiments of the present invention are described in detail below.
Example 1:
the embodiment provides a multi-split air conditioning system, as shown in fig. 1, which comprises a compressor 1, a four-way valve 2, an external heat exchanger 3, an electronic expansion valve 4, a flash tank 5 and a multi-channel internal machine 6 loop which is arranged in parallel and exchanges heat with the external heat exchanger, wherein the arrow direction in the figure is the refrigerant circulation direction under heating operation. The compressor compresses low-temperature and low-pressure gas into high-temperature and high-pressure gas through compression, the high-temperature and high-pressure gas flows through a Tda exhaust temperature sensing bulb, the exhaust temperature is detected in real time, the exhaust temperature enters an outer machine heat exchanger through a four-way valve, the temperature of air entering is detected through a Tao environment temperature sensing bulb on the outer machine, heat is radiated through an outer fan, the temperature of a refrigerant is reduced after heat exchange, the state is changed from a high-temperature and high-pressure state into a medium-temperature and medium-pressure liquid state (gaseous condensation heat radiation), the refrigerant then enters an electronic expansion valve, enters a flash tank for gas-liquid separation, is divided into two paths, one path of liquid enters an inner machine through a liquid pipe stop valve, throttles and cools through an inner machine expansion valve, the temperature of a Tei liquid pipe is detected, the temperature of the liquid pipe enters an indoor machine heat exchanger, the indoor temperature of the inner machine is detected through a Tao return air temperature sensing bulb, the air of the inner machine rotates to perform heat exchange (inner machine evaporation heat absorption) so that the air blown out of the inner machine is cool air, the state of the refrigerant is also changed from a low-temperature and low-pressure liquid state, the refrigerant flows into a gas state through a gas pipe temperature sensing tube of the air pipe, and then flows back to the air compressor through the air pipe temperature sensing valve, and returns to the air circulation valve for separation, and is separated into the outdoor air, and the gas phase is separated. The other path is opened through the auxiliary valve, and the gaseous refrigerant at the top of the flash tank can directly enter the compressor, so that the effects of reducing exhaust and improving the flow of the refrigerant are realized.
The system includes a heating operation mode, a defrosting operation mode, and a cooling operation mode. If it is detected that defrosting is required during the heating operation, the defrosting operation mode is switched to, and after defrosting is completed, the heating operation is restarted, and the operation mode of the restarted heating operation is identical to the operation mode of the heating operation mode before the defrosting mode is switched. The control methods of the heating operation mode, the defrosting mode and the cooling operation mode in this embodiment may directly adopt the control methods of the multi-split air conditioning system in the prior art, which are not described herein.
Example 2:
the embodiment provides a single-opening heating control method of a multi-split air conditioning system, which is applied to the multi-split air conditioning system shown in the embodiment 1, is applied to an application scene of restarting heating after defrosting is exited after a single-opening minimum number of indoor units are operated to defrost. And in the starting process of restarting heating under the application scene, the opening of the internal machine valve in the state to be machine is adjusted according to the following method:
opening the opening of the inner machine in the standby state to half of the maximum opening of the inner machine, and simultaneously detecting the exhaust temperature Tda of the compressor, the temperature Teo of an inner machine air pipe of a heating standby air conditioner, the temperature Teo1 of the inner machine air pipe of a heating starting air conditioner, the return air temperature TS, the low-pressure saturation temperature PS-t and the temperature Tei1 of a starting liquid pipe in the restarting heating operation process;
after the heating restarting operation, if any one of the following conditions is met, the opening of the valve to be built-in machine is adjusted according to a common control method:
condition one: the difference between the exhaust temperature Tda of the compressor and the temperature Teo of an air pipe of the air conditioner in heating standby is lower than a first preset temperature;
condition II: the difference between the exhaust temperature Tda of the compressor and the temperature Teo1 of an air pipe in the heating startup air conditioner is lower than a second preset temperature;
and (3) a third condition: the air return temperature TS and the low-pressure saturation temperature PS-t are the air return superheat degree, and the air return superheat degree is lower than a third preset temperature;
condition four: the continuous running time of the compressor exceeds a first preset time;
wherein the second preset temperature is lower than the first preset temperature;
the general control method includes:
and the opening of the standby internal machine is reduced to a first preset opening, then the opening of the standby internal machine is regulated according to the supercooling degree T, and the regulating range of the opening of the standby internal machine is between a second preset opening and the first preset opening, wherein the second preset opening is smaller than the first preset opening.
In an embodiment, in the above control method, half of the maximum opening of the indoor unit may be set to 200 steps, where the first preset temperature is preferably 50 ℃ in the above condition one, and the second preset temperature is preferably 35 ℃ in the above condition two, and since the temperature of the indoor unit air pipe when the air conditioning system is started is greater than the temperature of the indoor unit air pipe when the air conditioning system is standby, tda-Teo > Tda-Teo1; when the first and second conditions are satisfied, it is necessary to switch to the normal control to indicate that the refrigerant is recirculated in the system. According to the arrangement in the starting process, the system high pressure can be improved, the refrigerant circulation quantity is increased, and the speed of the single-opening heating effect is accelerated. Conditions three and four are set to avoid the risk of compressor liquid back due to excessive superheat of the back gas or continuous run time of the compressor. In an embodiment, the third preset temperature in the third condition may be set to 2 ℃, the first preset time in the fourth condition may be 12 minutes, and in other embodiments, the third preset temperature and the first preset time may be set according to actual requirements.
The above-mentioned regulation standby internal machine aperture according to the supercooling degree includes:
when T is Degree of supercooling The standby internal machine valve is closed, the standby internal machine valve is detected once every preset time interval, the number of each adjustment step is a, and the minimum opening is the second preset opening;
when the fourth preset temperature is less than or equal to T Degree of supercooling When the fifth preset temperature is less than or equal to the fifth preset temperature, the opening of the standby internal machine valve is unchanged;
when T is Degree of supercooling And when the temperature is not less than the fifth preset temperature, the standby internal machine valve is opened, the detection is carried out once every preset time interval, the number of each adjustment step is a, and the maximum opening is the first preset opening.
In an embodiment, the fourth preset temperature is 5 ℃, the fifth preset temperature is 9 ℃, a is 2 steps, the preset time interval may be 15s, the first preset opening is 80 steps, and the second preset opening is 50 steps. In the normal control stage, the opening adjustment range of the standby internal machine is between 50 and 80 steps.
T as described above Degree of supercooling =high pressure saturation temperature pd-t-standby tube temperature Tei,
the high-pressure saturation temperature Pd-t is calculated through the weight of the inlet and outlet temperatures of the internal machine, and the formula is as follows:
high-pressure saturation temperature Pd-t= (starting air pipe temperature Teo1+starting liquid pipe temperature Tei 1)/2.3/n, wherein n is the number of internal machines in starting.
In the first condition, it is also required to satisfy that the difference between Tda and Teo is lower than the first preset temperature for a preset time; in the second condition, it is further required to satisfy that the difference between Tda and Teo1 is lower than the second preset temperature for a preset time. The preset time may be generally set to 1min. According to the arrangement, the situation that the corresponding temperature difference meets the corresponding requirement due to the occurrence of accidental conditions but the actual refrigerant does not start to circulate can be eliminated.
The control method is further described below with reference to the specific embodiments:
for example: and (3) heating by single-start 1P under the condition of the outside temperature of 7 ℃ below zero and the inside temperature of 20 ℃ below zero, and starting the machine to 200 steps after the defrosting operation is finished and the machine is restarted.
The following 4 cases are assumed:
1. at the moment (the starting time is not more than 12 min), the exhaust temperature Tda is 77 ℃, the temperature Teo of the standby internal machine air pipe is 16 ℃, tda-Teo=61 ℃ is more than 50 ℃, and the opening of the standby valve is maintained at 200 steps;
when the exhaust temperature Tda is 90 ℃, the standby internal air pipe temperature Teo is 47 ℃, tda-Teo=43 ℃ and less than 50 ℃ and the duration is 1min, the control is ended, and the normal control of the standby valve is entered.
2. When the exhaust temperature Tda is 81 ℃ and the temperature Teo1 of the engine air pipe in the starting-up is 20 ℃ and Tda-Teo1=61 ℃ is more than 35 ℃, the opening of the standby valve is maintained at 200 steps;
when the exhaust temperature Tda is 83 ℃, the temperature Teo1 of the engine air pipe in the starting-up is 63.9 ℃, tda-teo1=19.1 ℃ is less than 35 ℃ and lasts for 1min, the control is ended, and the normal control (supercooling degree control) of the standby valve is entered.
3. When the superheat degree of the return air is 0 ℃, the temperature is less than 2 ℃, the return air directly enters a standby valve for common control.
4. After 12min of start-up, the normal control of the standby valve is directly entered, the standby valve is closed to 80 steps, and when the supercooling degree is 7 ℃, the standby valve is maintained at 80 steps.
While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: many changes, modifications, substitutions and variations may be made to the embodiments without departing from the spirit and principles of the invention, the scope of which is defined by the claims and their equivalents.
Claims (5)
1. The method is used in a multi-split air conditioning system, and the multi-split air conditioning system comprises a heating operation mode, a defrosting operation mode and a refrigerating operation mode, and is characterized in that an internal unit is restarted to the heating operation mode after defrosting, the internal unit with the smallest number is operated in the heating operation mode, and the opening of an internal unit valve in a standby state is adjusted in the starting process according to the following method:
opening the opening of the inner machine in the standby state to half of the maximum opening of the inner machine, and simultaneously detecting the exhaust temperature Tda of the compressor, the temperature Teo of an inner machine air pipe of a heating standby air conditioner, the temperature Teo1 of the inner machine air pipe of a heating starting air conditioner, the return air temperature TS, the low-pressure saturation temperature PS-t and the temperature Tei1 of a starting liquid pipe in the restarting heating operation process;
after the heating restarting operation, if any one of the following conditions is met, the opening of the valve to be built-in machine is adjusted according to a common control method:
condition one: the difference between the exhaust temperature Tda of the compressor and the temperature Teo of an air pipe of the air conditioner in heating standby is lower than a first preset temperature;
condition II: the difference between the exhaust temperature Tda of the compressor and the temperature Teo1 of an air pipe in the heating startup air conditioner is lower than a second preset temperature;
and (3) a third condition: the air return temperature TS and the low-pressure saturation temperature PS-t are the air return superheat degree, and the air return superheat degree is lower than a third preset temperature;
condition four: the continuous running time of the compressor exceeds a first preset time;
wherein the second preset temperature is lower than the first preset temperature;
the general control method includes:
the opening degree of the standby internal machine is reduced to a first preset opening degree, and then the opening degree is reduced according to the supercooling degree T Degree of supercooling And adjusting the opening of the standby internal machine, wherein the adjusting range of the opening of the standby internal machine is between a second preset opening and a first preset opening, and the second preset opening is smaller than the first preset opening.
2. The method for controlling single-open heating of a multi-split air conditioning system according to claim 1, wherein the adjusting the opening of the standby indoor unit according to the supercooling degree comprises:
when T is Degree of supercooling The standby internal machine valve is closed, the standby internal machine valve is detected once every preset time interval, the number of each adjustment step is a, and the minimum opening is the second preset opening;
when the fourth preset temperature is less than or equal to T Degree of supercooling When the fifth preset temperature is less than or equal to the fifth preset temperature, the opening of the standby internal machine valve is unchanged;
when T is Degree of supercooling And when the temperature is not less than the fifth preset temperature, the standby internal machine valve is opened, the detection is carried out once every preset time interval, the number of each adjustment step is a, and the maximum opening is the first preset opening.
3. The method for controlling single-split heating of multi-split air conditioning system according to claim 1 or 2, wherein,
T degree of supercooling =high pressure saturation temperature pd-t-standby tube temperature Tei,
the high-pressure saturation temperature Pd-t is calculated through the weight of the inlet and outlet temperatures of the internal machine, and the formula is as follows:
high-pressure saturation temperature Pd-t= (starting air pipe temperature Teo1+starting liquid pipe temperature Tei 1)/2.3/n, wherein n is the number of internal machines in starting.
4. The method for controlling single-split heating of a multi-split air conditioning system according to claim 1, wherein in the first condition, it is further required to satisfy that a difference between Tda and Teo is lower than a first preset temperature for a preset time; in the second condition, it is further required to satisfy that the difference between Tda and Teo1 is lower than the second preset temperature for a preset time.
5. The method for controlling single-split heating of a multi-split air conditioning system according to claim 1, wherein the multi-split air conditioning system comprises a plurality of parallel internal machine loops, wherein the inflow end of each internal machine loop is provided with a liquid pipe temperature sensing bulb, and the outflow end of each internal machine loop is provided with a return air temperature sensing bulb.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311409236.6A CN117308280A (en) | 2023-10-27 | 2023-10-27 | Single-opening heating control method for multi-split air conditioning system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311409236.6A CN117308280A (en) | 2023-10-27 | 2023-10-27 | Single-opening heating control method for multi-split air conditioning system |
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| CN117308280A true CN117308280A (en) | 2023-12-29 |
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| CN202311409236.6A Pending CN117308280A (en) | 2023-10-27 | 2023-10-27 | Single-opening heating control method for multi-split air conditioning system |
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| CN (1) | CN117308280A (en) |
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