CN111765595B - Multi-split air conditioner and defrosting control method and device thereof and storage medium - Google Patents
Multi-split air conditioner and defrosting control method and device thereof and storage medium Download PDFInfo
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- CN111765595B CN111765595B CN202010484808.7A CN202010484808A CN111765595B CN 111765595 B CN111765595 B CN 111765595B CN 202010484808 A CN202010484808 A CN 202010484808A CN 111765595 B CN111765595 B CN 111765595B
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- 238000010257 thawing Methods 0.000 title claims abstract description 166
- 238000000034 method Methods 0.000 title claims abstract description 49
- 238000005338 heat storage Methods 0.000 claims abstract description 78
- 238000004590 computer program Methods 0.000 claims description 7
- 238000009825 accumulation Methods 0.000 claims description 3
- 230000008569 process Effects 0.000 abstract description 14
- 239000003507 refrigerant Substances 0.000 description 51
- 238000010438 heat treatment Methods 0.000 description 44
- 238000001704 evaporation Methods 0.000 description 22
- 230000008020 evaporation Effects 0.000 description 20
- 230000005855 radiation Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 230000008878 coupling Effects 0.000 description 3
- 238000010168 coupling process Methods 0.000 description 3
- 238000005859 coupling reaction Methods 0.000 description 3
- 230000006870 function Effects 0.000 description 3
- 230000006698 induction Effects 0.000 description 3
- 238000007664 blowing Methods 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000003303 reheating Methods 0.000 description 2
- 206010063385 Intellectualisation Diseases 0.000 description 1
- 238000004378 air conditioning Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
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- 238000012545 processing Methods 0.000 description 1
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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
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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
- F24F11/62—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
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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
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
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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
- F24F2110/00—Control inputs relating to air properties
- F24F2110/10—Temperature
- F24F2110/12—Temperature of the outside air
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Abstract
The invention provides a multi-split air conditioner and a defrosting control method, a defrosting control device and a storage medium thereof, wherein the method comprises the following steps: before defrosting of the multi-split air conditioner, heat storage control is carried out on the indoor unit in a preset state before defrosting; when the multi-split air conditioner carries out defrosting, carrying out defrosting control on each indoor unit according to the state of each indoor unit; the preset state includes: the system comprises a power-off state, a power-on and temperature point reaching power-off state and/or a power-on and room unattended state. The scheme provided by the invention can accelerate the defrosting process and reduce the defrosting time.
Description
Technical Field
The invention relates to the field of control, in particular to a multi-split air conditioner, a defrosting control method and device thereof, and a storage medium.
Background
The multi-split air conditioner is more and more favored by users due to the flexibility and the intellectualization of installation and use of the multi-split air conditioner, the multi-split air conditioner is the same as a conventional air source air conditioner, when an outdoor unit frosts in a heating season, the multi-split air conditioner needs to be switched to a refrigeration mode for defrosting, the indoor unit cannot be heated during defrosting, defrosting time is long, user comfort can be affected, and the indoor air outlet temperature is reduced, the room temperature fluctuates, and the user comfort experience is poor.
Disclosure of Invention
The invention mainly aims to overcome the defects of the prior art and provides a multi-split air conditioner, a defrosting control method and device thereof and a storage medium, so as to solve the problem that the defrosting time is long and the comfort of a user is influenced in the prior art.
The invention provides a defrosting control method for a multi-split air conditioner, which comprises the following steps: before defrosting of the multi-split air conditioner, heat storage control is carried out on the indoor unit in a preset state before defrosting; when the multi-split air conditioner carries out defrosting, carrying out defrosting control on each indoor unit according to the state of each indoor unit; the preset state includes: the system comprises a power-off state, a power-on and temperature point reaching power-off state and/or a power-on and room unattended state.
Optionally, the method further comprises: determining the control time for performing the heat storage control according to the ratio of the total capacity of the indoor unit to the total capacity of the outdoor unit in the preset state and the outdoor environment temperature, wherein the control time comprises the following steps: determining a ratio interval to which the ratio belongs in more than two preset ratio intervals and a temperature interval to which the outdoor environment temperature belongs in more than two preset temperature intervals; and determining corresponding control time for carrying out heat storage control according to the ratio interval to which the ratio belongs and the temperature interval to which the outdoor environment temperature belongs.
Optionally, the performing of the heat storage control before defrosting the indoor unit in the preset state includes: for an indoor unit which is started and reaches a temperature point and is in a shutdown state, increasing the set temperature of the indoor unit by a preset temperature value; and/or increasing the opening of an electronic expansion valve of the indoor unit by a preset opening value for the indoor unit which is started and in a state that the room in which the indoor unit is located is unmanned; and/or, for the indoor unit in the shutdown state, the fan stops running, and the electronic expansion valve is controlled according to the indoor unit in the startup running.
Optionally, performing defrosting control on each indoor unit according to the state of each indoor unit, including: controlling fans of all indoor units of the multi-split air conditioner to be turned off; controlling an electronic expansion valve of an indoor unit to be opened for the indoor unit in a shutdown state and the indoor unit in a startup state and in an unmanned state of a room where the indoor unit is located; and/or controlling an electronic expansion valve of an indoor unit to be closed when the indoor unit is started and people exist in the room; and/or controlling whether an electronic expansion valve of an indoor unit is opened or not according to whether the multi-split air conditioner meets a preset condition or not for the indoor unit which is started and in which people exist in the room; the preset conditions comprise: the ratio of the total capacity of the indoor units in the power-off state and the indoor units in the power-on state and the room in which the indoor units are positioned are not less than a preset value; if the multi-split air conditioner meets the preset conditions, controlling an electronic expansion valve of an indoor unit to be closed for the indoor unit which is started and in which people exist in a room; if the multi-split air conditioner does not meet the preset condition, accumulating the capacities of the indoor units which are started and have people in the rooms to the total capacities of the indoor units which are in the shutdown state and the indoor units which are started and have no people in the rooms according to the sequence of the capacities from large to small until the ratio of the accumulated total capacity to the total capacity of the outdoor units is larger than or equal to the preset value, and controlling the accumulated startup and opening of the electronic expansion valves of the indoor units which have people in the rooms.
In another aspect, the present invention provides a defrosting control device for a multi-split air conditioner, including: the heat storage control unit is used for performing heat storage control on the indoor unit in a preset state before defrosting before the multi-split air conditioner defrosts; the defrosting control unit is used for controlling defrosting of each indoor unit according to the state of each indoor unit when the multi-split air conditioner performs defrosting; the preset state includes: the system comprises a power-off state, a power-on and temperature point reaching power-off state and/or a power-on and room unattended state.
Optionally, the method further comprises: a determination unit configured to determine a control time for performing the heat storage control according to a ratio of a total capacity of the indoor unit to a total capacity of the outdoor unit in a preset state and an outdoor ambient temperature, the determination unit including: determining a ratio interval to which the ratio belongs in more than two preset ratio intervals and a temperature interval to which the outdoor environment temperature belongs in more than two preset temperature intervals; and determining corresponding control time for carrying out heat storage control according to the ratio interval to which the ratio belongs and the temperature interval to which the outdoor environment temperature belongs.
Optionally, the heat storage control unit performs heat storage control before defrosting on the indoor unit in a preset state, and includes: controlling all indoor units of the multi-split air conditioner to be closed; for an indoor unit which is started and reaches a temperature point and is in a shutdown state, increasing the set temperature of the indoor unit by a preset temperature value; and/or increasing the opening of an electronic expansion valve of the indoor unit by a preset opening value for the indoor unit which is started and in a state that the room in which the indoor unit is located is unmanned; and/or, for the indoor unit in the shutdown state, the fan stops running, and the electronic expansion valve is controlled according to the indoor unit in the startup running.
Optionally, the defrosting control unit performs defrosting control on each indoor unit according to the state of each indoor unit, and includes: controlling fans of all indoor units of the multi-split air conditioner to be turned off; controlling an electronic expansion valve of an indoor unit to be opened for the indoor unit in a shutdown state and/or the indoor unit in a startup state and in an unmanned state of a room where the indoor unit is located; and/or controlling an electronic expansion valve of an indoor unit to be closed when the indoor unit is started and people exist in the room; and/or controlling whether an electronic expansion valve of an indoor unit is opened or not according to whether the multi-split air conditioner meets a preset condition or not for the indoor unit which is started and in which people exist in the room; the preset conditions comprise: the ratio of the total capacity of the indoor units in the power-off state and the indoor units in the power-on state and the room in which the indoor units are positioned are not less than a preset value; if the multi-split air conditioner meets the preset conditions, controlling an electronic expansion valve of an indoor unit to be closed for the indoor unit which is started and in which people exist in a room; if the multi-split air conditioner does not meet the preset condition, accumulating the capacities of the indoor units which are started and have people in the rooms to the total capacities of the indoor units which are in the shutdown state and the indoor units which are started and have no people in the rooms according to the sequence of the capacities from large to small until the ratio of the accumulated total capacity to the total capacity of the outdoor units is larger than or equal to the preset value, and controlling the accumulated startup and opening of the electronic expansion valves of the indoor units which have people in the rooms.
A further aspect of the invention provides a storage medium having stored thereon a computer program which, when executed by a processor, carries out the steps of any of the methods described above.
In yet another aspect, the present invention provides a multi-split air conditioner, which includes a processor, a memory, and a computer program stored in the memory and operable on the processor, wherein the processor implements the steps of any one of the methods when executing the computer program.
The invention further provides a multi-split air conditioner which comprises any one of the defrosting control devices of the multi-split air conditioner.
According to the technical scheme of the invention, before defrosting of the multi-split air conditioner, heat storage control is carried out on the indoor unit in a preset state before defrosting, the amount of high-temperature and high-pressure refrigerant stored in a heat exchanger of the multi-split air conditioner is increased, the heat of the indoor unit can increase the temperature of the heat exchanger and can also be radiated into room air, so that the heat can be absorbed during defrosting, the defrosting process is accelerated, the defrosting time is reduced, and the heat of the indoor unit side can be increased for defrosting control on the premise of having minimum influence on user experience;
the electronic expansion valve of the indoor unit in the shutdown state and the indoor unit in the startup state and the room in which the indoor unit is not in the human state are controlled to be opened during defrosting, the heat exchanger of the indoor unit is switched to the evaporation side, low-temperature and low-pressure refrigerant is in the heat exchanger, and heat is absorbed from the room through evaporation, so that the defrosting process can be accelerated, the defrosting time is shortened, and the comfort of a user is improved. For an indoor unit which is started and has people in a room, the electronic expansion valve of the indoor unit is closed during defrosting, so that high-temperature and high-pressure refrigerant in the original heating state can be maintained in the heat exchanger of the indoor unit, the temperature of the room is prevented from being reduced due to the fact that low-temperature and low-pressure refrigerant enters the heat exchanger, the problem of cold radiation caused by the fact that the indoor unit is switched to an evaporation side during defrosting is solved, the high-temperature and high-pressure refrigerant in the heat exchanger of the indoor unit can be maintained to the maximum extent, after defrosting is finished, the temperature and the pressure of the refrigerant in the heat exchanger are increased more quickly, the requirement that a fan is started to blow hot air to heat the indoor unit can be met more quickly, namely, the waiting time of preventing cold air of the indoor unit which is heated again after defrosting is finished is reduced.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. In the drawings:
fig. 1 is a method schematic diagram of an embodiment of a defrosting control method of a multi-split air conditioner provided by the invention;
FIG. 2 is a schematic flow chart illustrating a thermal storage control process according to an embodiment of the present invention before defrosting;
FIG. 3 is a schematic flow chart of an embodiment of the present invention for controlling defrosting;
fig. 4 is a block diagram illustrating a defrosting control device of a multi-split air conditioner according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the specific embodiments of the present invention and the accompanying drawings. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
The invention provides a multi-split air conditioner and a heating control method thereof. Each indoor unit is provided with a human body induction sensor for detecting whether a person moves in an air conditioning area of the indoor unit; the indoor unit is provided with an electronic expansion valve for adjusting the flow of the refrigerant; the indoor unit further comprises a fan used for providing circulating air volume.
In a conventional multi-split system, after frosting occurs in the operation of a heating mode, the defrosting needs to be switched to a refrigerating mode. During defrosting, heat exchangers of all indoor units of the system are in an evaporation state, low-temperature and low-pressure liquid refrigerant in the heat exchangers evaporates to absorb heat from a room, and in order to avoid influence on user experience caused by cold air blowing during defrosting, a fan of the indoor unit is usually turned off during defrosting, and the indoor unit is switched to a heating mode to operate after defrosting is finished. At the moment, a plurality of low-temperature and low-pressure refrigerants exist in the heat exchanger of the indoor unit, and the indoor fan is turned on only when the heat exchanger is filled with the high-temperature and high-pressure refrigerants during initial heating, so that cold air blowing is avoided. Therefore, the temperature fluctuation in the room during defrosting is obvious, and usually can be reduced by about 2-4 ℃, and the indoor unit has long cold air prevention time (waiting time before hot air is discharged) after defrosting is finished, so that the heating comfort is poor.
Fig. 1 is a method schematic diagram of an embodiment of a defrosting control method of a multi-split air conditioner provided by the invention.
As shown in fig. 1, according to an embodiment of the present invention, the defrosting control method of the multi-split air conditioner includes at least steps S110 and S120.
And step S110, before defrosting of the multi-split air conditioner, performing heat storage control on the indoor unit in a preset state before defrosting.
Specifically, when the multi-split air conditioner system is operated in a heating mode, whether the outdoor environment temperature is smaller than a first preset temperature value and whether the accumulated heating operation time of the multi-split air conditioner reaches a first preset time threshold value (the judgment time is for avoiding frequent defrosting), and when the outdoor environment temperature is smaller than the first preset temperature value and the accumulated heating operation time of the multi-split air conditioner reaches the first preset time threshold value, defrosting is started.
The preset state may specifically include a shutdown state, a shutdown state when the temperature is reached after the power is turned on, and/or a state when the room where the power is turned on is unmanned. The shutdown state may specifically include a state in which the indoor unit is turned on and operates to reach a temperature point and is shut down. Whether a person exists in a room is detected through the human body induction sensor.
Preferably, at a preset time before defrosting of the multi-split air conditioner, heat storage control before defrosting is performed on the indoor unit in a preset state. And determining the preset time, namely the control time for carrying out the heat storage control according to the ratio of the total capacity of the indoor unit to the total capacity of the outdoor unit in a preset state and the outdoor environment temperature. For example: the number of the indoor units in the preset state is 3, the capacity of each indoor unit is 2.5kW, 3.2kW and 4.0kW, and the capacity of the outdoor unit is 28.0kW, and the ratio of the capacity to the capacity of the outdoor unit is 9.7kW/28.0kW, namely 34.6%.
Specifically, determining a ratio interval to which the ratio belongs in more than two preset ratio intervals and a temperature interval to which the outdoor environment temperature belongs in more than two preset temperature intervals; and determining corresponding control time for carrying out heat storage control according to the ratio interval to which the ratio belongs and the temperature interval to which the outdoor environment temperature belongs. More specifically, a correspondence table (obtained through experiments) of more than two ratio sections, more than two ratio section temperature sections and corresponding heat storage control time is preset, and a ratio section to which a ratio of the total capacity of the indoor unit to the total capacity of the outdoor unit in a preset state belongs and control time corresponding to a temperature section to which the outdoor environment temperature belongs are searched in the correspondence table.
For example, the correspondence table between two or more ratio intervals and temperature intervals of two or more ratio intervals and corresponding heat storage control times may refer to table 1:
| T＜a1 | a1≤T＜a2 | a2≤T＜a3 | a3≤T | |
| P1＜b1 | t1-1 | t1-2 | t1-3 | t1-4 |
| b1≤P1＜b2 | t1-5 | t1-6 | t1-7 | t1-8 |
| b2≤P1＜b3 | t1-9 | t1-10 | t1-11 | t1-12 |
| b3≤P1 | t1-13 | t1-14 | t1-15 | t1-16 |
TABLE 1
Wherein P1 is the ratio of the total capacity of the indoor units to the total capacity of the outdoor units in the preset state, and T is the outdoor ambient temperature.
The larger the ratio and/or the larger the outdoor ambient temperature, the smaller the heat storage control time. Because if the number of indoor heat storage units is too small, the outdoor unit is not sufficiently defrosted because the outdoor unit is defrosted by absorbing heat from the rooms, the amount of heat stored is increased at t1 when the number of indoor heat storage units is small, i.e., the larger the P1, the more indoor heat storage units are, and the smaller the t1 is; the lower the outdoor ambient temperature, the greater the amount of heat required for defrosting, and the greater t 1.
Optionally, when the multi-split air conditioner meets a preset heat storage control condition, heat storage control before defrosting is performed on the indoor unit in a preset state, and when the multi-split air conditioner meets a defrosting condition, the multi-split air conditioner is controlled to start defrosting. The heat storage control conditions may specifically include: the outdoor environment temperature is smaller than a second preset temperature value, and the accumulated heating operation time of the multi-split air conditioner reaches a second preset time threshold value, wherein the second preset temperature value is larger than the first preset temperature value, and the second preset time threshold value is smaller than the first preset time threshold value. The difference between the first preset time threshold and the second preset time threshold is equal to the preset time. That is, the temperature value entering the heat storage control is a little higher than the temperature value entering the defrosting, and the accumulated heating operation time entering the heat storage control is a little shorter than the accumulated heating operation time entering the defrosting, so that whether the heat storage control is started or not is judged according to the temperature value and the accumulated heating operation time, and a period of time is left before entering the defrosting when the heat storage control is started.
The heat storage control before defrosting of the indoor unit in the preset state may specifically include at least one of the following control modes:
(1) and for the indoor unit which is in a starting-up state and reaches a temperature point and a stopping state, increasing the set temperature of the indoor unit by a preset temperature value.
Specifically, for an indoor unit whose temperature reaching point is in a shutdown state, the set temperature (heating operation when the room temperature is lower than the set temperature) of the indoor unit is forcibly increased by a preset temperature value Δ T, so that the indoor unit is restored to the heating operation state, thereby increasing the heat storage capacity of the heat exchanger.
For example, if the user sets the room temperature to be lower than 24 ℃ for heating, and stops the machine when the room temperature reaches 24 ℃, the set temperature is forcibly increased, for example, 2 ℃ or 3 ℃, namely, the indoor unit is operated for heating at the target temperature of 26 ℃ or 27 ℃, and the heating operation can be continued to increase the heat storage capacity of the heat exchanger of the indoor unit.
(2) And for the indoor unit which is started and in the state that the room is not occupied by people, increasing the opening of the electronic expansion valve of the indoor unit by a preset opening value.
For an indoor unit which is started to operate and is located in an unmanned room, the opening degree of an electronic expansion valve of the indoor unit is forcibly increased by a preset opening degree value delta P (on the basis of normal control). By increasing the opening degree of the electronic expansion valve, the flow rate of the refrigerant can be increased, and the heat storage capacity of the heat exchanger can be increased.
(3) For the indoor unit in the shutdown state, the fan stops running, and the electronic expansion valve is controlled according to the indoor unit in the startup running state.
Specifically, the electronic expansion valve of the started indoor unit has a certain opening degree, so that the flow of the refrigerant can meet the heating requirement of the started indoor unit. For the indoor unit in the shutdown state, the electronic expansion valve keeps a first preset opening degree, and the first preset opening degree enables the flow of the refrigerant to meet the heating requirement of the startup operation of the indoor unit.
The heat storage control is used for correspondingly controlling the heat storage of the indoor unit which is shut down, started up to reach a temperature point, shut down and/or started up and is located in an unmanned room before defrosting, so that the amount of high-temperature and high-pressure refrigerant stored in the heat exchanger is increased, the heat of the high-temperature and high-pressure refrigerant can be increased, and the heat can be radiated to the air of the room. The heat of this part can be absorbed during the defrosting, and the defrosting process is accelerateed, reduces the defrosting time, can use under the prerequisite that experiences the minimum influence to the user, increases the heat of indoor machine side and is used for defrosting control.
And step S120, when the multi-split air conditioner is defrosted, performing defrosting control on each indoor unit according to the state of each indoor unit.
In a specific embodiment, when the multi-split air conditioner is defrosted, controlling fans of all indoor units of the multi-split air conditioner to be turned off, and controlling electronic expansion valves of the indoor units to be opened for the indoor units in a shutdown state and the indoor units in a startup state and in an unmanned state; and for the indoor unit which is started and has people in the room, controlling an electronic expansion valve of the indoor unit to be closed.
The method comprises the steps of controlling an electronic expansion valve of an indoor unit to be opened for the indoor unit in a shutdown state and the indoor unit in a startup state and a room in which the indoor unit is not occupied, switching a heat exchanger of the indoor unit to an evaporation side, and absorbing heat from the room by evaporation by using a low-temperature and low-pressure refrigerant in the heat exchanger, so that the defrosting process can be accelerated, the defrosting time can be shortened, and the comfort of a user can be improved.
For the indoor unit which is started and in which people are in the room, the electronic expansion valve is closed during defrosting, so that the high-temperature and high-pressure refrigerant in the original heating state can be maintained in the heat exchanger of the indoor unit, and the temperature of the room is prevented from being reduced due to the fact that the low-temperature and low-pressure refrigerant enters the heat exchanger; avoiding cold radiation and reducing the temperature drop of the room, so that the heat can not be absorbed from the indoor unit.
The electronic expansion valve of the indoor unit is closed during defrosting, high-temperature and high-pressure refrigerant in the heat exchanger of the indoor unit can be maintained to the greatest extent, after defrosting is finished, the temperature and the pressure of the refrigerant in the heat exchanger rise faster, and the requirement that the fan is opened to blow hot air to heat can be met more quickly, namely, the waiting time for reheating after defrosting is finished is reduced. Therefore, by adopting the technical scheme of the invention, the switching of the states of the refrigerant in the heat exchanger of the indoor unit during heating can be reduced, and the temperature fluctuation of a room can be reduced.
Preferably, in another specific embodiment, when the multi-split air conditioner is defrosted, the fans of all the indoor units of the multi-split air conditioner are controlled to be turned off, and the electronic expansion valves of the indoor units are controlled to be opened for the indoor units in a shutdown state and the indoor units in a startup state and in an unattended room; and controlling whether an electronic expansion valve of the indoor unit is opened or not according to whether the multi-split air conditioner meets a preset condition or not for the indoor unit which is started and in which a person exists in a room.
The method comprises the steps of controlling an electronic expansion valve of an indoor unit to be opened for the indoor unit in a shutdown state and the indoor unit in a startup state and a room in which the indoor unit is not occupied, switching a heat exchanger of the indoor unit to an evaporation side, and absorbing heat from the room by evaporation by using a low-temperature and low-pressure refrigerant in the heat exchanger, so that the defrosting process can be accelerated, the defrosting time can be shortened, and the comfort of a user can be improved.
And for the indoor unit which is started and in which people exist, controlling whether an electronic expansion valve of the indoor unit is opened or not according to whether the multi-split air conditioner meets the preset condition or not. The preset conditions specifically include: the ratio of the total capacity of the indoor units in the power-off state and the indoor units in the power-on state and the room in which the indoor units are located in the unmanned state to the total capacity of the outdoor units is larger than or equal to a preset value.
And if the multi-split air conditioner meets the preset conditions, controlling an electronic expansion valve of an indoor unit to be closed for the indoor unit which is started and in which people exist in the room. The refrigerant in the heat exchanger of the indoor unit is a high-temperature and high-pressure refrigerant during heating, continues to radiate heat of a room, and does not radiate cold.
If the multi-split air conditioner does not meet the preset conditions, accumulating the capacity of the indoor unit which is started and in which a person exists in a room to the total capacity of the indoor unit which is in a shutdown state and the indoor unit which is started and in which the room is not occupied according to the sequence of the capacities from large to small until the ratio of the accumulated total capacity (namely the sum of the accumulated capacity of the indoor unit which is started and in which the person exists in the room and the total capacity of the indoor unit which is in the shutdown state and the indoor unit which is started and in which the person exists) to the total capacity of the outdoor unit is larger than or equal to the preset value, controlling the accumulated starting and the electronic expansion valve of the indoor unit in which the person exists in the room to be opened, switching a heat exchanger of the indoor unit to an evaporation side, and evaporating low-temperature and low-pressure refrigerant in.
That is, when the number of heat-storage indoor units is small, if only the heat is absorbed from the room where the indoor units are located during defrosting, the heat is not enough to defrost the outdoor unit, therefore, when the number of the heat-storage indoor units is small, the electronic expansion valves of the indoor units for the opened users are sequentially opened, and the low-temperature and low-pressure refrigerant in the heat exchanger evaporates to absorb the heat from the room for defrosting. For example: there are 3 indoor units that do not have people in the system, the capacity is 2.5kW respectively, 3.2kW, 4.0kW, suppose that outer machine capacity is 28.0kW, its percentage is 9.7kW/28.0kW ═ 34.6%, suppose that default c is 45%, correspond 28.0 ═ 45 ═ 12.6kW, then the indoor unit that has accumulated the people and use still needs, suppose that the indoor unit that someone used is 2.2kW in proper order, 2.8kW, 3.6kW, 2.5kW, 3.6kW etc. then preferentially accumulate one 3.6kW be 9.7+3.6 ═ 13.3kW, reach 12.6 kW.
In order to clearly illustrate the technical solution of the present invention, an execution flow of the defrosting control method of the multi-split air conditioner provided by the present invention is described below with a specific embodiment.
Fig. 2 is a flowchart illustrating a heat accumulation control before defrosting according to an embodiment of the present invention. As shown in fig. 2, the heating mode is operated for a period of time, whether the outdoor unit is frosted is judged, if the outdoor unit (heat exchanger) is frosted, heat storage control is performed on the indoor unit in the shutdown state, the indoor unit in the shutdown state after being started to a temperature point and in the shutdown state, and the indoor unit in the startup operation without human activity within time t1 before entering the defrosting operation, wherein for the indoor unit in the shutdown state, a fan is normally controlled, and an Electronic Expansion Valve (EEV) is processed according to the startup operation of the indoor unit; the temperature of the indoor unit in a state from starting to temperature point and stopping is set to be increased by delta T forcibly, and EEV is increased by delta P forcibly for the indoor unit which runs by starting and has no personnel activity; the indoor unit which runs the split type air conditioner and is moved by a person is normally controlled.
FIG. 3 is a flow chart illustrating an embodiment of the defrosting control according to the present invention. As shown in fig. 3, after the heat storage control is performed, during the defrosting operation when the defrosting condition is satisfied, fans of all indoor units are turned off, if the preset condition is satisfied (the ratio of the total capacity of the indoor unit in the shutdown state and the indoor unit in the startup state and in the room where the indoor unit is unattended to the total capacity of the outdoor unit is greater than or equal to the preset value), an electronic expansion valve (hereinafter referred to as EEV) of the indoor unit which is started up to operate and in which personnel move is turned off, a heat exchanger of the indoor unit is not connected to an evaporation side, and a refrigerant in the heat exchanger is a high-temperature and high-pressure refrigerant during heating, continues to be room radiation heat; the EEV of the indoor unit which is started to operate and has no personnel activity and the indoor unit in the shutdown state is opened, if the preset condition is not met, the electronic expansion valve of the indoor unit which is started to operate and has personnel activity is opened in sequence from large to small according to the capacity, until the preset condition is met, the heat exchanger of the indoor unit with the opened electronic expansion valve is switched to an evaporation side, low-temperature and low-pressure refrigerant is filled in the heat exchanger, and heat is absorbed from a room through evaporation. After defrosting is finished, all indoor units are controlled normally.
Fig. 4 is a block diagram illustrating a defrosting control device of a multi-split air conditioner according to an embodiment of the present invention. As shown in fig. 3, the multi-split air conditioner defrosting control apparatus 100 includes: a heat storage control unit 110 and a defrosting control unit 120.
The heat storage control unit 110 is configured to perform heat storage control on an indoor unit in a preset state before defrosting the multi-split air conditioner.
Specifically, when the multi-split air conditioner system is operated in a heating mode, whether the outdoor environment temperature is smaller than a first preset temperature value and whether the accumulated heating operation time of the multi-split air conditioner reaches a first preset time threshold value (the judgment time is for avoiding frequent defrosting), and when the outdoor environment temperature is smaller than the first preset temperature value and the accumulated heating operation time of the multi-split air conditioner reaches the first preset time threshold value, defrosting is started.
The preset state may specifically include a shutdown state, a shutdown state when the temperature is reached after the power is turned on, and/or a state when the room where the power is turned on is unmanned. The shutdown state may specifically include a state in which the indoor unit is turned on and operates to reach a temperature point and is shut down. Whether a person exists in a room is detected through the human body induction sensor.
Preferably, at a preset time before defrosting of the multi-split air conditioner, heat storage control before defrosting is performed on the indoor unit in a preset state. The apparatus 100 may further include a determination unit (not shown) configured to determine the preset time, that is, the control time for performing the heat storage control, according to a ratio of a total capacity of the indoor units to a total capacity of the outdoor units in a preset state and an outdoor ambient temperature. For example: the number of the indoor units in the preset state is 3, the capacity of each indoor unit is 2.5kW, 3.2kW and 4.0kW, and the capacity of the outdoor unit is 28.0kW, and the ratio of the capacity to the capacity of the outdoor unit is 9.7kW/28.0kW, namely 34.6%.
Specifically, determining a ratio interval to which the ratio belongs in more than two preset ratio intervals and a temperature interval to which the outdoor environment temperature belongs in more than two preset temperature intervals; and determining corresponding control time for carrying out heat storage control according to the ratio interval to which the ratio belongs and the temperature interval to which the outdoor environment temperature belongs. More specifically, a correspondence table (obtained through experiments) of more than two ratio sections, more than two ratio section temperature sections and corresponding heat storage control time is preset, and a ratio section to which a ratio of the total capacity of the indoor unit to the total capacity of the outdoor unit in a preset state belongs and control time corresponding to a temperature section to which the outdoor environment temperature belongs are searched in the correspondence table.
For example, the correspondence table between two or more ratio intervals and temperature intervals of two or more ratio intervals and corresponding heat storage control times may refer to table 1:
| T＜a1 | a1≤T＜a2 | a2≤T＜a3 | a3≤T | |
| P1＜b1 | t1-1 | t1-2 | t1-3 | t1-4 |
| b1≤P1＜b2 | t1-5 | t1-6 | t1-7 | t1-8 |
| b2≤P1＜b3 | t1-9 | t1-10 | t1-11 | t1-12 |
| b3≤P1 | t1-13 | t1-14 | t1-15 | t1-16 |
TABLE 1
Wherein P1 is the ratio of the total capacity of the indoor units to the total capacity of the outdoor units in the preset state, and T is the outdoor ambient temperature.
The larger the ratio and/or the larger the outdoor ambient temperature, the smaller the heat storage control time. Because if the number of indoor heat storage units is too small, the outdoor unit is not sufficiently defrosted because the outdoor unit is defrosted by absorbing heat from the rooms, the amount of heat stored is increased at t1 when the number of indoor heat storage units is small, i.e., the larger the P1, the more indoor heat storage units are, and the smaller the t1 is; the lower the outdoor ambient temperature, the greater the amount of heat required for defrosting, and the greater t 1.
Alternatively, the heat storage control unit 110 performs heat storage control before defrosting on the indoor unit in a preset state when the multi-split air conditioner satisfies a preset heat storage control condition, and controls the multi-split air conditioner to start defrosting when the multi-split air conditioner satisfies a defrosting condition. The heat storage control conditions may specifically include: the outdoor environment temperature is smaller than a second preset temperature value, and the accumulated heating operation time of the multi-split air conditioner reaches a second preset time threshold value, wherein the second preset temperature value is larger than the first preset temperature value, and the second preset time threshold value is smaller than the first preset time threshold value. The difference between the first preset time threshold and the second preset time threshold is equal to the preset time. That is, the temperature value entering the heat storage control is a little higher than the temperature value entering the defrosting, and the accumulated heating operation time entering the heat storage control is a little shorter than the accumulated heating operation time entering the defrosting, so that whether the heat storage control is started or not is judged according to the temperature value and the accumulated heating operation time, and a period of time is left before entering the defrosting when the heat storage control is started.
The heat storage control unit 110 may specifically perform heat storage control before defrosting the indoor unit in the preset state by at least one of the following control modes:
(1) and for the indoor unit which is in a starting-up state and reaches a temperature point and a stopping state, increasing the set temperature of the indoor unit by a preset temperature value.
Specifically, for an indoor unit whose temperature reaching point is in a shutdown state, the set temperature (heating operation when the room temperature is lower than the set temperature) of the indoor unit is forcibly increased by a preset temperature value Δ T, so that the indoor unit is restored to the heating operation state, thereby increasing the heat storage capacity of the heat exchanger.
For example, if the user sets the room temperature to be lower than 24 ℃ for heating, and stops the machine when the room temperature reaches 24 ℃, the set temperature is forcibly increased, for example, 2 ℃ or 3 ℃, namely, the indoor unit is operated for heating at the target temperature of 26 ℃ or 27 ℃, and the heating operation can be continued to increase the heat storage capacity of the heat exchanger of the indoor unit.
(2) And for the indoor unit which is started and in the state that the room is not occupied by people, increasing the opening of the electronic expansion valve of the indoor unit by a preset opening value.
For an indoor unit which is started to operate and is located in an unmanned room, the opening degree of an electronic expansion valve of the indoor unit is forcibly increased by a preset opening degree value delta P (on the basis of normal control). By increasing the opening degree of the electronic expansion valve, the flow rate of the refrigerant can be increased, and the heat storage capacity of the heat exchanger can be increased.
(3) For the indoor unit in the shutdown state, the fan stops running, and the electronic expansion valve is controlled according to the indoor unit in the startup running state.
Specifically, the electronic expansion valve of the started indoor unit has a certain opening degree, so that the flow of the refrigerant can meet the heating requirement of the started indoor unit. For the indoor unit in the shutdown state, the electronic expansion valve keeps a first preset opening degree, and the first preset opening degree enables the flow of the refrigerant to meet the heating requirement of the startup operation of the indoor unit.
The heat storage control is used for correspondingly controlling the heat storage of the indoor unit which is shut down, started up to reach a temperature point, shut down and/or started up and is located in an unmanned room before defrosting, so that the amount of high-temperature and high-pressure refrigerant stored in the heat exchanger is increased, the heat of the high-temperature and high-pressure refrigerant can be increased, and the heat can be radiated to the air of the room. The heat of this part can be absorbed during the defrosting, and the defrosting process is accelerateed, reduces the defrosting time, can use under the prerequisite that experiences the minimum influence to the user, increases the heat of indoor machine side and is used for defrosting control.
The defrosting control unit 120 is configured to perform defrosting control on each indoor unit according to a state of each indoor unit when the multi-split air conditioner performs defrosting.
In an embodiment, the defrosting control unit 120 may specifically perform defrosting control on each indoor unit according to a state of each indoor unit, including: when the multi-split air conditioner is defrosted, controlling fans of all indoor units of the multi-split air conditioner to be closed, and controlling electronic expansion valves of the indoor units to be opened for the indoor units in a shutdown state and the indoor units in a startup state and in an unmanned state of a room where the indoor units are located; and for the indoor unit which is started and has people in the room, controlling an electronic expansion valve of the indoor unit to be closed.
The method comprises the steps of controlling an electronic expansion valve of an indoor unit to be opened for the indoor unit in a shutdown state and the indoor unit in a startup state and a room in which the indoor unit is not occupied, switching a heat exchanger of the indoor unit to an evaporation side, and absorbing heat from the room by evaporation by using a low-temperature and low-pressure refrigerant in the heat exchanger, so that the defrosting process can be accelerated, the defrosting time can be shortened, and the comfort of a user can be improved.
For the indoor unit which is started and in which people are in the room, the electronic expansion valve is closed during defrosting, so that the high-temperature and high-pressure refrigerant in the original heating state can be maintained in the heat exchanger of the indoor unit, and the temperature of the room is prevented from being reduced due to the fact that the low-temperature and low-pressure refrigerant enters the heat exchanger; avoiding cold radiation and reducing the temperature drop of the room, so that the heat can not be absorbed from the indoor unit.
The electronic expansion valve of the indoor unit is closed during defrosting, high-temperature and high-pressure refrigerant in the heat exchanger of the indoor unit can be maintained to the greatest extent, after defrosting is finished, the temperature and the pressure of the refrigerant in the heat exchanger rise faster, and the requirement that the fan is opened to blow hot air to heat can be met more quickly, namely, the waiting time for reheating after defrosting is finished is reduced. Therefore, by adopting the technical scheme of the invention, the switching of the states of the refrigerant in the heat exchanger of the indoor unit during heating can be reduced, and the temperature fluctuation of a room can be reduced.
Preferably, in another specific embodiment, the defrosting control unit 120 performing defrosting control on each indoor unit according to the state of each indoor unit may specifically include: when the multi-split air conditioner is defrosted, controlling fans of all indoor units of the multi-split air conditioner to be closed, and controlling electronic expansion valves of the indoor units to be opened for the indoor units in a shutdown state and the indoor units in a startup state and in an unmanned state of a room where the indoor units are located; and controlling whether an electronic expansion valve of the indoor unit is opened or not according to whether the multi-split air conditioner meets a preset condition or not for the indoor unit which is started and in which a person exists in a room.
The method comprises the steps of controlling an electronic expansion valve of an indoor unit to be opened for the indoor unit in a shutdown state and the indoor unit in a startup state and a room in which the indoor unit is not occupied, switching a heat exchanger of the indoor unit to an evaporation side, and absorbing heat from the room by evaporation by using a low-temperature and low-pressure refrigerant in the heat exchanger, so that the defrosting process can be accelerated, the defrosting time can be shortened, and the comfort of a user can be improved.
And for the indoor unit which is started and in which people exist, controlling whether an electronic expansion valve of the indoor unit is opened or not according to whether the multi-split air conditioner meets the preset condition or not. The preset conditions specifically include: the ratio of the total capacity of the indoor units in the power-off state and the indoor units in the power-on state and the room in which the indoor units are located in the unmanned state to the total capacity of the outdoor units is larger than or equal to a preset value.
And if the multi-split air conditioner meets the preset conditions, controlling an electronic expansion valve of an indoor unit to be closed for the indoor unit which is started and in which people exist in the room. The refrigerant in the heat exchanger of the indoor unit is a high-temperature and high-pressure refrigerant during heating, continues to radiate heat of a room, and does not radiate cold.
If the multi-split air conditioner does not meet the preset conditions, accumulating the capacity of the indoor unit which is started and in which a person exists in a room to the total capacity of the indoor unit which is in a shutdown state and the indoor unit which is started and in which the room is not occupied according to the sequence of the capacities from large to small until the ratio of the accumulated total capacity (namely the sum of the accumulated capacity of the indoor unit which is started and in which the person exists in the room and the total capacity of the indoor unit which is in the shutdown state and the indoor unit which is started and in which the person exists) to the total capacity of the outdoor unit is larger than or equal to the preset value, controlling the accumulated starting and the electronic expansion valve of the indoor unit in which the person exists in the room to be opened, switching a heat exchanger of the indoor unit to an evaporation side, and evaporating low-temperature and low-pressure refrigerant in.
That is, when the number of heat-storage indoor units is small, if only the heat is absorbed from the room where the indoor units are located during defrosting, the heat is not enough to defrost the outdoor unit, therefore, when the number of the heat-storage indoor units is small, the electronic expansion valves of the indoor units for the opened users are sequentially opened, and the low-temperature and low-pressure refrigerant in the heat exchanger evaporates to absorb the heat from the room for defrosting. For example: there are 3 indoor units that do not have people in the system, the capacity is 2.5kW respectively, 3.2kW, 4.0kW, suppose that outer machine capacity is 28.0kW, its percentage is 9.7kW/28.0kW ═ 34.6%, suppose that default c is 45%, correspond 28.0 ═ 45 ═ 12.6kW, then the indoor unit that has accumulated the people and use still needs, suppose that the indoor unit that someone used is 2.2kW in proper order, 2.8kW, 3.6kW, 2.5kW, 3.6kW etc. then preferentially accumulate one 3.6kW be 9.7+3.6 ═ 13.3kW, reach 12.6 kW.
The invention also provides a storage medium corresponding to the defrosting control method of the multi-split air conditioner, wherein a computer program is stored on the storage medium, and when the program is executed by a processor, the program realizes the steps of any one of the methods.
The invention also provides a multi-split air conditioner corresponding to the defrosting control method of the multi-split air conditioner, which comprises a processor, a memory and a computer program which is stored in the memory and can run on the processor, wherein the processor realizes the steps of any one of the methods when executing the program.
The invention also provides a multi-split air conditioner corresponding to the multi-split air conditioner defrosting control device, which comprises any one of the multi-split air conditioner defrosting control devices.
According to the scheme provided by the invention, before defrosting of the multi-split air conditioner, heat storage control is carried out on the indoor unit in a preset state before defrosting, the amount of high-temperature and high-pressure refrigerant stored in the heat exchanger is increased, the heat can increase the temperature of the heat exchanger and can also be radiated into room air, so that the heat can be absorbed during defrosting, the defrosting process is accelerated, the defrosting time is shortened, and the heat on the side of the indoor unit can be increased for defrosting control on the premise of having minimum influence on user experience;
the electronic expansion valve of the indoor unit in the shutdown state and the indoor unit in the startup state and the room in which the indoor unit is not in the human state are controlled to be opened during defrosting, the heat exchanger of the indoor unit is switched to the evaporation side, low-temperature and low-pressure refrigerant is in the heat exchanger, and heat is absorbed from the room through evaporation, so that the defrosting process can be accelerated, the defrosting time is shortened, and the comfort of a user is improved. For an indoor unit which is started and has people in a room, the electronic expansion valve of the indoor unit is closed during defrosting, so that high-temperature and high-pressure refrigerant in the original heating state can be maintained in the heat exchanger of the indoor unit, the temperature of the room is prevented from being reduced due to the fact that low-temperature and low-pressure refrigerant enters the heat exchanger, the problem of cold radiation caused by the fact that the indoor unit is switched to an evaporation side during defrosting is solved, the high-temperature and high-pressure refrigerant in the heat exchanger of the indoor unit can be maintained to the maximum extent, after defrosting is finished, the temperature and the pressure of the refrigerant in the heat exchanger are increased more quickly, the requirement that a fan is started to blow hot air to heat the indoor unit can be met more quickly, namely, the waiting time of preventing cold air of the indoor unit which is heated again after defrosting is finished is reduced.
The functions described herein may be implemented in hardware, software executed by a processor, firmware, or any combination thereof. If implemented in software executed by a processor, the functions may be stored on or transmitted over as one or more instructions or code on a computer-readable medium. Other examples and implementations are within the scope and spirit of the invention and the following claims. For example, due to the nature of software, the functions described above may be implemented using software executed by a processor, hardware, firmware, hardwired, or a combination of any of these. In addition, each functional unit may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit.
In the embodiments provided in the present application, it should be understood that the disclosed technology can be implemented in other ways. The above-described embodiments of the apparatus are merely illustrative, and for example, the division of the units may be a logical division, and in actual implementation, there may be another division, for example, multiple units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, units or modules, and may be in an electrical or other form.
The units described as separate parts may or may not be physically separate, and the parts serving as the control device may or may not be physical units, may be located in one place, or may be distributed on a plurality of units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a removable hard disk, a magnetic or optical disk, and other various media capable of storing program codes.
The above description is only an example of the present invention, and is not intended to limit the present invention, and it is obvious to those skilled in the art that various modifications and variations can be made in the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the claims of the present invention.
Claims (8)
1. A defrosting control method of a multi-split air conditioner is characterized by comprising the following steps:
before defrosting of the multi-split air conditioner, heat storage control is carried out on the indoor unit in a preset state before defrosting;
when the multi-split air conditioner carries out defrosting, carrying out defrosting control on each indoor unit according to the state of each indoor unit;
the preset state includes: the system comprises a shutdown state, a startup and temperature point reaching shutdown state and/or a startup and room in which the system is not in a human state;
the heat storage control before defrosting is carried out on the indoor unit in the preset state, and the heat storage control method comprises the following steps:
for an indoor unit which is started and reaches a temperature point and is in a shutdown state, increasing the set temperature of the indoor unit by a preset temperature value; and/or the presence of a gas in the gas,
for an indoor unit which is started and in an unmanned state in a room, increasing the opening of an electronic expansion valve of the indoor unit by a preset opening value; and/or the presence of a gas in the gas,
for the indoor unit in the shutdown state, the fan stops running, and the electronic expansion valve is controlled according to the indoor unit in the startup running state.
2. The method of claim 1, further comprising:
determining the control time for performing the heat storage control according to the ratio of the total capacity of the indoor unit to the total capacity of the outdoor unit in the preset state and the outdoor environment temperature, wherein the control time comprises the following steps:
determining a ratio interval to which the ratio belongs in more than two preset ratio intervals and a temperature interval to which the outdoor environment temperature belongs in more than two preset temperature intervals;
and determining corresponding control time for carrying out heat storage control according to the ratio interval to which the ratio belongs and the temperature interval to which the outdoor environment temperature belongs.
3. The method according to claim 1 or 2, wherein the defrosting control of each indoor unit according to the state of each indoor unit comprises:
controlling fans of all indoor units of the multi-split air conditioner to be turned off;
controlling an electronic expansion valve of an indoor unit to be opened for the indoor unit in a shutdown state and the indoor unit in a startup state and in an unmanned state of a room where the indoor unit is located;
and/or the presence of a gas in the gas,
for an indoor unit which is started and in which people exist, controlling an electronic expansion valve of the indoor unit to be closed;
and/or the presence of a gas in the gas,
for an indoor unit which is started and in which people exist, controlling whether an electronic expansion valve of the indoor unit is opened or not according to whether the multi-split air conditioner meets a preset condition or not; the preset conditions comprise: the ratio of the total capacity of the indoor units in the power-off state and the indoor units in the power-on state and the room in which the indoor units are positioned are not less than a preset value;
if the multi-split air conditioner meets the preset conditions, controlling an electronic expansion valve of an indoor unit to be closed for the indoor unit which is started and in which people exist in a room;
if the multi-split air conditioner does not meet the preset condition, accumulating the capacities of the indoor units which are started and have people in the rooms to the total capacities of the indoor units which are in the shutdown state and the indoor units which are started and have no people in the rooms according to the sequence of the capacities from large to small until the ratio of the accumulated total capacity to the total capacity of the outdoor units is larger than or equal to the preset value, and controlling the accumulated startup and opening of the electronic expansion valves of the indoor units which have people in the rooms.
4. The utility model provides a multi-split air conditioner defrosting control device which characterized in that includes:
the heat storage control unit is used for performing heat storage control on the indoor unit in a preset state before defrosting before the multi-split air conditioner defrosts;
the defrosting control unit is used for controlling defrosting of each indoor unit according to the state of each indoor unit when the multi-split air conditioner performs defrosting;
the preset state includes: the system comprises a shutdown state, a startup and temperature point reaching shutdown state and/or a startup and room in which the system is not in a human state;
the heat accumulation control unit is used for carrying out heat accumulation control on the indoor unit in the preset state before defrosting, and comprises the following steps:
for an indoor unit which is started and reaches a temperature point and is in a shutdown state, increasing the set temperature of the indoor unit by a preset temperature value; and/or the presence of a gas in the gas,
for an indoor unit which is started and in an unmanned state in a room, increasing the opening of an electronic expansion valve of the indoor unit by a preset opening value; and/or the presence of a gas in the gas,
for the indoor unit in the shutdown state, the fan stops running, and the electronic expansion valve is controlled according to the indoor unit in the startup running state.
5. The apparatus of claim 4, further comprising: a determination unit configured to determine a control time for performing the heat storage control according to a ratio of a total capacity of the indoor unit to a total capacity of the outdoor unit in a preset state and an outdoor ambient temperature, the determination unit including:
determining a ratio interval to which the ratio belongs in more than two preset ratio intervals and a temperature interval to which the outdoor environment temperature belongs in more than two preset temperature intervals;
and determining corresponding control time for carrying out heat storage control according to the ratio interval to which the ratio belongs and the temperature interval to which the outdoor environment temperature belongs.
6. The apparatus according to claim 4 or 5, wherein the defrosting control unit performs defrosting control on each indoor unit according to a state of each indoor unit, and includes:
controlling fans of all indoor units of the multi-split air conditioner to be turned off;
controlling an electronic expansion valve of an indoor unit to be opened for the indoor unit in a shutdown state and/or the indoor unit in a startup state and in an unmanned state of a room where the indoor unit is located;
and/or the presence of a gas in the gas,
for an indoor unit which is started and in which people exist, controlling an electronic expansion valve of the indoor unit to be closed;
and/or the presence of a gas in the gas,
for an indoor unit which is started and in which people exist, controlling whether an electronic expansion valve of the indoor unit is opened or not according to whether the multi-split air conditioner meets a preset condition or not; the preset conditions comprise: the ratio of the total capacity of the indoor units in the power-off state and the indoor units in the power-on state and the room in which the indoor units are positioned are not less than a preset value;
if the multi-split air conditioner meets the preset conditions, controlling an electronic expansion valve of an indoor unit to be closed for the indoor unit which is started and in which people exist in a room;
if the multi-split air conditioner does not meet the preset condition, accumulating the capacities of the indoor units which are started and have people in the rooms to the total capacities of the indoor units which are in the shutdown state and the indoor units which are started and have no people in the rooms according to the sequence of the capacities from large to small until the ratio of the accumulated total capacity to the total capacity of the outdoor units is larger than or equal to the preset value, and controlling the accumulated startup and opening of the electronic expansion valves of the indoor units which have people in the rooms.
7. A storage medium, having stored thereon a computer program which, when being executed by a processor, carries out the steps of the method of any one of claims 1 to 3.
8. A multi-split air conditioner comprising a processor, a memory, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the steps of the method as claimed in any one of claims 1 to 3, or comprises the defrosting control device of the multi-split air conditioner as claimed in any one of claims 4 to 6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010484808.7A CN111765595B (en) | 2020-06-01 | 2020-06-01 | Multi-split air conditioner and defrosting control method and device thereof and storage medium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202010484808.7A CN111765595B (en) | 2020-06-01 | 2020-06-01 | Multi-split air conditioner and defrosting control method and device thereof and storage medium |
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| Publication Number | Publication Date |
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| CN112539521B (en) * | 2020-12-21 | 2022-02-22 | 珠海格力电器股份有限公司 | Air conditioner multi-split air conditioner and defrosting control method and device and storage medium thereof |
| CN112797570B (en) * | 2020-12-30 | 2022-08-23 | 宁波奥克斯电气股份有限公司 | Defrosting control method, defrosting device and multi-connected air conditioning system |
| CN112902391B (en) * | 2021-03-08 | 2022-03-29 | 珠海格力电器股份有限公司 | Control method of multi-split air conditioner, readable storage medium and multi-split air conditioner |
| CN115751612A (en) * | 2021-09-02 | 2023-03-07 | 广东美的暖通设备有限公司 | Defrosting control method and device for multi-split air conditioning system |
| CN113819578B (en) * | 2021-10-25 | 2022-10-28 | 宁波奥克斯电气股份有限公司 | Air conditioner control method and air conditioner |
| CN114811854B (en) * | 2022-04-20 | 2024-05-14 | 青岛海尔空调电子有限公司 | Method, device and system for controlling multi-split air conditioning system and storage medium |
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