CN113074438B - Multi-connected air conditioner and defrosting control method thereof - Google Patents
Multi-connected air conditioner and defrosting control method thereof Download PDFInfo
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- CN113074438B CN113074438B CN202110220222.4A CN202110220222A CN113074438B CN 113074438 B CN113074438 B CN 113074438B CN 202110220222 A CN202110220222 A CN 202110220222A CN 113074438 B CN113074438 B CN 113074438B
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- defrosting
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- outdoor
- air conditioner
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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
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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
- F24F11/54—Control or safety arrangements characterised by user interfaces or communication using one central controller connected to several sub-controllers
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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
- 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
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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
- F24F2140/00—Control inputs relating to system states
- F24F2140/10—Pressure
- F24F2140/12—Heat-exchange fluid pressure
Abstract
The invention discloses a multi-connected air conditioner and an air conditioner defrosting control method, wherein the multi-connected air conditioner comprises at least one compressor, at least one indoor side heat exchanger, at least two rows of outdoor heat exchangers, a phase-change heat storage device and a controller, wherein the controller is configured to: acquiring heat accumulation amount of a heat accumulator of the phase change heat accumulation device, wherein the first defrosting energy consumption of the first outdoor heat exchanger and the second defrosting energy consumption of the second outdoor heat exchanger are respectively acquired; and determining a defrosting cycle type based on the heat accumulation amount of the heat accumulator, the first defrosting energy consumption and the second defrosting energy consumption, and controlling the multi-connected air conditioner to enter the defrosting cycle type, so that the heating performance of the multi-connected air conditioner is not influenced in the defrosting process, and the comfort level of a user is improved.
Description
Technical Field
The present application relates to the field of air conditioner control, and more particularly, to a multi-connected air conditioner and a defrosting control method for the air conditioner.
Background
When the outdoor heat exchanger is an evaporator in heating operation in winter, the surface of the outdoor evaporator is easy to frost, and the frosting not only increases the heat exchange thermal resistance between the surface of the heat exchanger and the air so as to influence the heat exchange effect, but also blocks the air circulation channel of the heat exchanger when the frost layer is accumulated to a certain thickness, so that the air flow is reduced, and the heating quantity and the reliability of the operation of the air source heat pump system are further influenced; periodic defrosting of the unit is required.
In the aspect of defrosting control, in reverse circulation defrosting widely adopted at present, a four-way valve is powered off and commutates during defrosting, and compressor exhaust directly enters an outdoor heat exchanger to provide a heat source for a defrosting process, and the indoor side is an evaporation heat absorption process, so that the indoor heating effect can be influenced. Meanwhile, in the traditional reverse circulation defrosting process, the four-way valve is required to be switched from an ON state to an OFF state of heating operation, so that the influence ON the system operation state is large, the time for recovering the heating operation after defrosting is finished is long, and the comprehensive heating operation effect is further influenced.
Therefore, how to ensure the heating performance and the comfort of the user during the defrosting process is a technical problem to be solved at present.
Disclosure of Invention
The invention provides a multi-connected air conditioner which is used for solving the technical problems that heating performance and comfort level of a user in a defrosting process cannot be guaranteed in the prior art. The multi-connected air conditioner includes:
at least one compressor;
at least one indoor side heat exchanger comprising at least one indoor side electronic expansion valve;
at least two rows of outdoor heat exchangers, wherein each row of outdoor heat exchangers comprises an outdoor electronic expansion valve, and loops of the rows of outdoor heat exchangers are mutually independent;
A phase change heat storage device;
a controller configured to:
acquiring heat accumulation amount of a heat accumulator of the phase change heat accumulation device, wherein the first defrosting energy consumption of the first outdoor heat exchanger and the second defrosting energy consumption of the second outdoor heat exchanger are respectively acquired;
and determining a defrosting cycle type based on the heat accumulation amount of the heat accumulator, the first defrosting energy consumption and the second defrosting energy consumption, and controlling the multi-connected air conditioner to enter the defrosting cycle type, wherein the defrosting cycle type comprises a first defrosting cycle, a second defrosting cycle, a third defrosting cycle, a fourth defrosting cycle and a fifth defrosting cycle.
In some embodiments, the controller is configured to:
when the air conditioner meets a preset defrosting condition, judging whether the heat accumulation amount of the heat accumulator is larger than or equal to the sum of the first defrosting energy consumption and the second defrosting energy consumption;
if yes, controlling the air conditioner to enter the third defrosting cycle;
if not, determining the defrosting cycle type based on the heat accumulation amount of the heat accumulator and the first defrosting energy consumption.
In some embodiments, the controller is configured to:
when the air conditioner enters the third defrosting cycle, defrosting the first row of outdoor heat exchangers and the second row of outdoor heat exchangers based on heat in the phase change heat storage device, and judging whether the indoor side heat exchangers are in a heating running state or not;
If the indoor side heat exchanger is not in a heating running state, controlling the indoor side electronic expansion valve to be in a closing state, performing throttling and depressurization operation based on the outdoor side electronic expansion valve, and exiting the third defrosting cycle and entering the heating cycle when a preset defrosting exit condition is met;
if the indoor side heat exchanger is in a heating operation state, the indoor side electronic expansion valve is controlled to be in an open state, and compressor exhaust gas is controlled to enter the indoor side heat exchanger and the outdoor side heat exchanger respectively so as to perform heating operation and defrosting operation, and based on the indoor side electronic expansion valve and the outdoor side electronic expansion valve, throttling and depressurization operation is performed, and when a preset defrosting exit condition is met, the third defrosting cycle is exited and the heating cycle is entered.
In some embodiments, the controller is configured to:
judging whether the heat accumulation amount of the heat accumulator is larger than or equal to the first defrosting energy consumption;
if yes, controlling the air conditioner to enter the first defrosting cycle;
if not, determining the defrosting cycle type based on the heat accumulation amount of the heat accumulator and the second defrosting energy consumption.
In some embodiments, the controller is configured to:
When the air conditioner enters the first defrosting cycle, defrosting the first row of outdoor heat exchangers based on heat in the phase change heat storage device and judging whether the indoor side heat exchangers are in a heating running state or not;
if the indoor side heat exchanger is not in a heating running state, controlling the indoor side electronic expansion valve to be in a closing state, performing throttling and depressurization operation based on the outdoor side electronic expansion valve, exiting the first defrosting cycle when a preset defrosting exit condition is met, and entering the second defrosting cycle when the heat accumulation amount of the heat accumulator is greater than or equal to the second defrosting energy consumption;
if the indoor side heat exchanger is in a heating operation state, the indoor side electronic expansion valve is controlled to be in an open state, and compressor exhaust gas is controlled to enter the indoor side heat exchanger and the outdoor side heat exchanger respectively so as to perform heating operation and defrosting operation, and based on the indoor side electronic expansion valve and the outdoor side electronic expansion valve, throttling and depressurization operation is performed, the first defrosting cycle is exited when a preset defrosting exit condition is met, and the second defrosting cycle is entered when the heat accumulation capacity of the heat accumulator is larger than or equal to the second defrosting energy consumption.
In some embodiments, the controller is configured to:
judging whether the heat accumulation amount of the heat accumulator is larger than or equal to the second defrosting energy consumption;
if yes, controlling the air conditioner to enter the second defrosting cycle;
if not, controlling the air conditioner to enter the first defrosting cycle, and controlling the air conditioner to enter the fifth defrosting cycle when a preset exit condition is met.
In some embodiments, the controller is configured to:
when the air conditioner enters the second defrosting cycle, defrosting the second outdoor heat exchanger based on heat in the phase change heat storage device, and judging whether the indoor side heat exchanger is in a heating running state or not;
if the indoor side heat exchanger is not in a heating running state, controlling the indoor side electronic expansion valve to be in a closing state, performing throttling and depressurization operation based on the outdoor side electronic expansion valve, exiting the second defrosting cycle when a preset defrosting exit condition is met, controlling the air conditioner to reenter the first defrosting cycle when the heat accumulation amount of the heat accumulator is more than or equal to the first defrosting energy consumption, and controlling the air conditioner to enter the fifth defrosting cycle when the second defrosting energy consumption is not more than or equal to the first defrosting energy consumption;
If the indoor side heat exchanger is in a heating operation state, the indoor side electronic expansion valve is controlled to be in an open state, compressor exhaust is controlled to enter the indoor side heat exchanger and the outdoor side heat exchanger respectively so as to perform heating operation and defrosting operation, throttling and depressurization operation is performed on the basis of the indoor side electronic expansion valve and the outdoor side electronic expansion valve, the second defrosting cycle is exited when a preset defrosting exit condition is met, the air conditioner is controlled to reenter the first defrosting cycle when the heat accumulation capacity of the heat accumulator is larger than or equal to the first defrosting energy consumption, and the air conditioner is controlled to enter the fifth defrosting cycle when the second defrosting energy consumption is not larger than or equal to the first defrosting energy consumption.
In some embodiments, the controller is configured to:
when the air conditioner enters the fourth defrosting cycle, defrosting the second row of outdoor heat exchangers based on the first row of outdoor heat exchangers, and judging whether the indoor side heat exchangers are in a heating running state or not;
if the indoor side heat exchanger is not in a heating running state, controlling the indoor side electronic expansion valve to be in a closing state, performing throttling and depressurization operation based on the outdoor side electronic expansion valve, exiting the fourth defrosting cycle when a preset defrosting exit condition is met, and controlling an air conditioner to enter the fifth defrosting cycle;
If the indoor side heat exchanger is in a heating operation state, the indoor side electronic expansion valve is controlled to be in an open state, compressor exhaust is controlled to enter the indoor side heat exchanger and the outdoor side heat exchanger respectively so as to perform heating operation and defrosting operation, throttling and depressurization operation is performed on the basis of the indoor side electronic expansion valve and the outdoor side electronic expansion valve, and when a preset defrosting exit condition is met, the fourth defrosting cycle is exited, and an air conditioner is controlled to enter the fifth defrosting cycle.
In some embodiments, the controller is configured to:
when the air conditioner enters the fifth defrosting cycle, defrosting the first row of outdoor heat exchangers based on the second row of outdoor heat exchangers, and judging whether the indoor side heat exchangers are in a heating running state or not;
if the indoor side heat exchanger is not in a heating running state, controlling the indoor side electronic expansion valve to be in a closing state, performing throttling and depressurization operation based on the outdoor side electronic expansion valve, exiting the fifth defrosting cycle when a preset defrosting exit condition is met, and controlling an air conditioner to enter the heating cycle;
if the indoor side heat exchanger is in a heating operation state, the indoor side electronic expansion valve is controlled to be in an open state, compressor exhaust gas is controlled to enter the indoor side heat exchanger and the outdoor side heat exchanger respectively so as to perform heating operation and defrosting operation, throttling and depressurization operation is performed on the basis of the indoor side electronic expansion valve and the outdoor side electronic expansion valve, and when a preset defrosting exit condition is met, the fifth defrosting cycle is exited, and an air conditioner is controlled to enter the heating cycle.
Correspondingly, the invention also provides an air conditioner defrosting control method which is applied to the multi-connected air conditioner comprising at least one compressor, at least one indoor side heat exchanger, at least two rows of outdoor heat exchangers, a phase change heat storage device and a controller, and comprises the following steps:
acquiring heat accumulation amount of a heat accumulator of the phase change heat accumulation device, wherein the first defrosting energy consumption of a first outdoor heat exchanger and the second defrosting energy consumption of a second outdoor heat exchanger are obtained;
and determining a defrosting cycle type based on the heat accumulation amount of the heat accumulator, the first defrosting energy consumption and the second defrosting energy consumption, and controlling the multi-connected air conditioner to enter the defrosting cycle type, wherein the defrosting cycle type comprises a first defrosting cycle, a second defrosting cycle, a third defrosting cycle, a fourth defrosting cycle and a fifth defrosting cycle.
Compared with the prior art, the application has the following beneficial effects:
the invention discloses a multi-connected air conditioner and an air conditioner defrosting control method, wherein the multi-connected air conditioner comprises at least one compressor, at least one indoor side heat exchanger, at least two rows of outdoor heat exchangers, a phase-change heat storage device and a controller, wherein the controller is configured to: acquiring heat accumulation amount of a heat accumulator of the phase change heat accumulation device, wherein the first defrosting energy consumption of the first outdoor heat exchanger and the second defrosting energy consumption of the second outdoor heat exchanger are respectively acquired; and determining a defrosting cycle type based on the heat accumulation amount of the heat accumulator, the first defrosting energy consumption and the second defrosting energy consumption, and controlling the multi-connected air conditioner to enter the defrosting cycle type, so that the heating performance of the multi-connected air conditioner is not influenced in the defrosting process, and the comfort level of a user is improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the description of the embodiments will be briefly introduced below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 shows a schematic diagram of a prior art thermal storage operation cycle of an air conditioner;
FIG. 2 shows a schematic diagram of a prior art phase change thermal storage air conditioning system;
FIG. 3 shows a schematic diagram of a defrost mode cycle according to an embodiment of the present invention;
fig. 4 shows a schematic diagram of a defrosting cycle system in a heating operation state of an indoor side heat exchanger according to an embodiment of the present invention;
FIG. 5 shows a schematic diagram of a defrosting cycle system when the indoor side heat exchanger according to the embodiment of the invention is not in a heating operation state;
fig. 6 shows a flow chart of a defrosting control method for an air conditioner according to an embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present application will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all, of the embodiments of the present application. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure.
In the description of the present application, it should be understood that the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, merely to facilitate description of the present application and simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present application.
The terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present application, unless otherwise indicated, the meaning of "a plurality" is two or more.
In the description of the present application, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art in a specific context.
As described in the background art, in the aspect of defrosting control, in reverse cycle defrosting widely adopted at present, when defrosting, the four-way valve is powered off and commutated, the exhaust gas of the press directly enters the outdoor heat exchanger to provide a heat source for the defrosting process, and the indoor side is an evaporation heat absorption process, so that the indoor heating effect can be influenced. Meanwhile, in the traditional reverse circulation defrosting process, the four-way valve is required to be switched from an ON state to an OFF state of heating operation, the influence ON the system operation state is large, the time for recovering the heating operation after the defrosting is finished is long, the comprehensive heating operation effect is further influenced, and fig. 1 and 2 are control methods for defrosting the air conditioner system in the prior art.
To further describe the solution of the present application, in an example of the present application, the multi-connected air conditioner includes:
at least one compressor;
at least one indoor side heat exchanger comprising at least one indoor side electronic expansion valve;
at least two rows of outdoor heat exchangers, wherein each row of outdoor heat exchangers comprises an outdoor electronic expansion valve, and loops of the rows of outdoor heat exchangers are mutually independent;
A phase change heat storage device;
a controller configured to:
acquiring heat accumulation amount of a heat accumulator of the phase change heat accumulation device, wherein the first defrosting energy consumption of the first outdoor heat exchanger and the second defrosting energy consumption of the second outdoor heat exchanger are respectively acquired;
and determining a defrosting cycle type based on the heat accumulation amount of the heat accumulator, the first defrosting energy consumption and the second defrosting energy consumption, and controlling the multi-connected air conditioner to enter the defrosting cycle type, wherein the defrosting cycle type comprises a first defrosting cycle, a second defrosting cycle, a third defrosting cycle, a fourth defrosting cycle and a fifth defrosting cycle.
In the embodiment of the application, as shown in fig. 3, the schematic diagram of the multi-split air conditioning system is shown, at least one compressor Comp, at least one gas-liquid separator Accum, three electromagnetic valves SV 1-SV 3, two or more three-way valves TV1, TV2, at least two rows of outdoor heat exchangers ODU, each row including an outdoor side electronic expansion valve EVOn, at least one indoor side heat exchanger IDUn, including at least one indoor side electronic expansion valve EVOn, the indoor side electronic expansion valve or the outdoor side electronic expansion valve can perform throttling and depressurization, the defrosting cycle is realized by controlling the opening of each of the electronic expansion valve, four-way valve, three-way valve and electromagnetic valve in the defrosting starting to defrosting stopping process, the function of defrosting is realized by increasing the condensation waste heat in the phase change heat storage device REGEN recovery system, the four-way valve FV in the system is not reversed during defrosting, and the multi-split air conditioning system has five defrosting modes, and the heat storage capacity requirement on the heat storage device is low by combining defrosting with defrosting of the outdoor heat exchangers.
To determine the defrost type, in some embodiments, the controller is configured to:
when the air conditioner meets a preset defrosting condition, judging whether the heat accumulation amount of the heat accumulator is larger than or equal to the sum of the first defrosting energy consumption and the second defrosting energy consumption;
if yes, controlling the air conditioner to enter the third defrosting cycle;
if not, determining the defrosting cycle type based on the heat accumulation amount of the heat accumulator and the first defrosting energy consumption.
In the embodiment, when the air conditioner meets the preset defrosting condition, judging whether the heat accumulation amount of the heat accumulator is enough, if so, defrosting the first outdoor heat exchanger and the second outdoor heat exchanger by using the heat in the heat accumulator, and entering a third defrosting cycle; if the heat storage capacity of the heat accumulator is insufficient and is smaller than the sum of the first defrosting energy consumption and the second defrosting energy consumption, determining the type of the defrosting cycle based on the heat storage capacity of the heat accumulator and the first defrosting energy consumption, and determining the next defrosting cycle according to the determined type of the defrosting cycle.
It should be noted that, the above-mentioned default defrosting condition is a condition for judging whether to defrost in the existing multi-connected air conditioner, and belongs to the existing technical characteristics, so it is not described here again, and the present application avoids the influence of the defrosting process on the comfort level of indoor personnel on the basis of the conventional default defrosting condition.
To better achieve the defrost effect, in some embodiments, the controller is configured to:
when the air conditioner enters the third defrosting cycle, defrosting the first row of outdoor heat exchangers and the second row of outdoor heat exchangers based on heat in the phase change heat storage device, and judging whether the indoor side heat exchangers are in a heating running state or not;
if the indoor side heat exchanger is not in a heating running state, controlling the indoor side electronic expansion valve to be in a closing state, performing throttling and depressurization operation based on the outdoor side electronic expansion valve, and exiting the third defrosting cycle and entering the heating cycle when a preset defrosting exit condition is met;
if the indoor side heat exchanger is in a heating operation state, the indoor side electronic expansion valve is controlled to be in an open state, and compressor exhaust gas is controlled to enter the indoor side heat exchanger and the outdoor side heat exchanger respectively so as to perform heating operation and defrosting operation, and based on the indoor side electronic expansion valve and the outdoor side electronic expansion valve, throttling and depressurization operation is performed, and when a preset defrosting exit condition is met, the third defrosting cycle is exited and the heating cycle is entered.
In this embodiment, as shown in fig. 4, which is a schematic diagram of a defrosting circulation system in a heating operation state of an indoor heat exchanger, as shown in fig. 5, which is a schematic diagram of a defrosting circulation system in a heating operation state of an indoor heat exchanger, in a defrosting cycle, the on/off state of the indoor heat exchanger can be freely set according to needs, heating flexibility and comfort are ensured, normal operation of an indoor air conditioner is not affected, when the air conditioner enters a third defrosting cycle, the heat in the phase-change heat storage device is utilized to defrost the first outdoor heat exchanger and the second outdoor heat exchanger, and whether the indoor heat exchanger is in the heating operation state is judged, the four-way valve is not in the defrosting process, so that larger fluctuation of the system operation state caused by the switching of the four-way valve in the traditional defrosting process is avoided, the four-way valve is not in the defrosting operation recovery time is shorter, if the indoor heat exchanger is not in the heating operation state, the indoor electronic expansion valve is in the closing state, the indoor electronic expansion valve is not in the defrosting process, the indoor electronic expansion valve is only used for providing heat, only in the heat storage device, the electronic expansion valve is in the outdoor expansion valve is in the defrosting process, the condition of reducing the pressure and the electronic expansion valve is in the outdoor side, and the electronic expansion valve is in the preset condition of exiting the defrosting cycle is satisfied, and the third defrosting cycle is entered; if the indoor side heat exchanger is in a heating operation state, the indoor side electronic expansion valve is in an open state, compressor exhaust is controlled to enter the indoor side heat exchanger and the outdoor side heat exchanger respectively, after the compressor exhaust is condensed by the first row of outdoor heat exchangers and the second row of outdoor heat exchangers, the compressor exhaust is throttled and depressurized by the outdoor side electronic expansion valve and the indoor side electronic expansion valve to enter the phase change heat storage device for absorbing heat, return air returns to the compressor through the gas-liquid separator, defrosting circulation is realized through control of each valve, and after the first row of outdoor heat exchangers and the second row of outdoor heat exchangers meet defrosting exiting conditions, the third defrosting circulation is exited, and then the normal heating operation mode is shifted.
It should be noted that, the preset defrosting exit condition is a condition for judging whether to exit the defrosting in the existing multi-connected air conditioner, and belongs to the existing technical characteristics, so that the details are not repeated here; the above-described determination of the heating operation state of each indoor heat exchanger depends on the setting of the user, and the description thereof will not be repeated.
To further determine the defrost type, in some embodiments, the controller is configured to:
judging whether the heat accumulation amount of the heat accumulator is larger than or equal to the first defrosting energy consumption;
if yes, controlling the air conditioner to enter the first defrosting cycle;
if not, determining the defrosting cycle type based on the heat accumulation amount of the heat accumulator and the second defrosting energy consumption.
In this embodiment, whether the heat accumulation amount of the heat accumulator is greater than or equal to the first defrosting energy consumption is determined, if the heat accumulation amount of the heat accumulator is greater than or equal to the first defrosting energy consumption, the first outdoor heat exchanger is defrosted based on the heat in the phase change heat accumulation device, and a first defrosting cycle is entered; and if the heat accumulation amount of the heat accumulator is smaller than the first defrosting energy consumption, determining the type of the defrosting cycle based on the heat accumulation amount of the heat accumulator and the second defrosting energy consumption, and determining the next defrosting cycle according to the determined type of the defrosting cycle.
To better achieve the defrost effect, in some embodiments, the controller is configured to:
when the air conditioner enters the first defrosting cycle, defrosting the first row of outdoor heat exchangers based on heat in the phase change heat storage device and judging whether the indoor side heat exchangers are in a heating running state or not;
if the indoor side heat exchanger is not in a heating running state, controlling the indoor side electronic expansion valve to be in a closing state, performing throttling and depressurization operation based on the outdoor side electronic expansion valve, exiting the first defrosting cycle when a preset defrosting exit condition is met, and entering the second defrosting cycle when the heat accumulation amount of the heat accumulator is greater than or equal to the second defrosting energy consumption;
if the indoor side heat exchanger is in a heating operation state, the indoor side electronic expansion valve is controlled to be in an open state, and compressor exhaust gas is controlled to enter the indoor side heat exchanger and the outdoor side heat exchanger respectively so as to perform heating operation and defrosting operation, and based on the indoor side electronic expansion valve and the outdoor side electronic expansion valve, throttling and depressurization operation is performed, the first defrosting cycle is exited when a preset defrosting exit condition is met, and the second defrosting cycle is entered when the heat accumulation capacity of the heat accumulator is larger than or equal to the second defrosting energy consumption.
In this embodiment, when the air conditioner has entered the first defrosting cycle, defrost the first outdoor heat exchanger based on the heat in the phase change heat storage device, and determine whether the indoor side heat exchanger is in a heating operation state, in the defrosting process, the four-way valve is not reversing defrosting, if the indoor side heat exchanger is in the heating operation state, the indoor side electronic expansion valve is in a closed state, and based on the outdoor side electronic expansion valve, the operation does not affect the normal operation of the indoor side air conditioner, the defrosting cycle is realized by controlling the opening of each valve of the electronic expansion valve, the four-way valve, the three-way valve and the electromagnetic valve, and the first defrosting cycle is exited when the preset defrosting exit condition is satisfied, and the second defrosting cycle is entered when the heat storage capacity of the heat storage device is greater than or equal to the second defrosting energy consumption; if the indoor side heat exchanger is in a heating running state, the indoor side electronic expansion valve is in an open state, compressor exhaust is controlled to enter the indoor side heat exchanger and the outdoor side heat exchanger respectively, after the compressor exhaust is condensed by the first row of outdoor heat exchangers, the compressor exhaust is throttled and depressurized by the outdoor side electronic expansion valve and the indoor side electronic expansion valve to enter the phase change heat storage device to absorb heat, return air returns to the compressor through the gas-liquid separator, after the first row of outdoor heat exchangers meet the defrosting exit condition, the first defrosting cycle is exited, at the moment, whether the heat storage capacity of the heat storage device is larger than or equal to the second defrosting energy consumption is judged, and if the heat storage capacity of the heat storage device is larger than or equal to the second defrosting energy consumption, the second defrosting cycle is entered to defrost.
To further determine the defrost type, in some embodiments, the controller is configured to:
judging whether the heat accumulation amount of the heat accumulator is larger than or equal to the second defrosting energy consumption;
if yes, controlling the air conditioner to enter the second defrosting cycle;
if not, controlling the air conditioner to enter the first defrosting cycle, and controlling the air conditioner to enter the fifth defrosting cycle when a preset exit condition is met.
In this embodiment, whether the heat stored in the heat accumulator is greater than or equal to the second defrosting energy consumption is determined, if the heat stored in the heat accumulator is greater than or equal to the second defrosting energy consumption, the heat in the heat accumulator is used to defrost the second outdoor heat exchanger, the second defrosting cycle is realized through control of each valve, the compressor exhaust gas is condensed by the second outdoor heat exchanger, then is throttled and depressurized by the outdoor side electronic expansion valve to enter the phase change heat accumulator to absorb heat, the return air returns to the compressor through the gas-liquid separator, when the second outdoor heat exchanger meets the defrosting exit condition, the second defrosting cycle is exited, and when the heat stored in the heat accumulator is greater than or equal to the first defrosting energy consumption, the air conditioner is controlled to reenter the first defrosting cycle, and when the preset exit condition is met, the air conditioner is controlled to enter the fifth defrosting cycle, the principle is that when the heat in the heat accumulator is insufficient to satisfy the defrosting requirement, the first outdoor heat exchanger is defrosted through the second outdoor heat exchanger, and the valve is not reversing in the defrosting process.
To better achieve the defrost effect, in some embodiments, the controller is configured to:
when the air conditioner enters the second defrosting cycle, defrosting the second outdoor heat exchanger based on heat in the phase change heat storage device, and judging whether the indoor side heat exchanger is in a heating running state or not;
if the indoor side heat exchanger is not in a heating running state, controlling the indoor side electronic expansion valve to be in a closing state, performing throttling and depressurization operation based on the outdoor side electronic expansion valve, exiting the second defrosting cycle when a preset defrosting exit condition is met, controlling the air conditioner to reenter the first defrosting cycle when the heat accumulation amount of the heat accumulator is more than or equal to the first defrosting energy consumption, and controlling the air conditioner to enter the fifth defrosting cycle when the second defrosting energy consumption is not more than or equal to the first defrosting energy consumption;
if the indoor side heat exchanger is in a heating operation state, the indoor side electronic expansion valve is controlled to be in an open state, compressor exhaust is controlled to enter the indoor side heat exchanger and the outdoor side heat exchanger respectively so as to perform heating operation and defrosting operation, throttling and depressurization operation is performed on the basis of the indoor side electronic expansion valve and the outdoor side electronic expansion valve, the second defrosting cycle is exited when a preset defrosting exit condition is met, the air conditioner is controlled to reenter the first defrosting cycle when the heat accumulation capacity of the heat accumulator is larger than or equal to the first defrosting energy consumption, and the air conditioner is controlled to enter the fifth defrosting cycle when the second defrosting energy consumption is not larger than or equal to the first defrosting energy consumption.
In this embodiment, when the air conditioner has entered into the second defrosting cycle, defrosting is performed on the second outdoor heat exchanger based on heat in the phase change heat storage device, the four-way valve is not reversing defrosting during the defrosting process, at this time, if the indoor side heat exchanger is not in a heating operation state, the indoor side electronic expansion valve is in a closed state, and performs a throttling and depressurization operation based on the outdoor side electronic expansion valve, and exits the second defrosting cycle when a preset defrosting exit condition is satisfied, and controls the air conditioner to reenter the first defrosting cycle when the heat stored in the heat storage device is greater than or equal to the first defrosting energy consumption, and controls the air conditioner to enter the fifth defrosting cycle when the second defrosting energy consumption is not greater than or equal to the first defrosting energy consumption; if the indoor side heat exchanger is in a heating operation state, the side electronic expansion valve is in an open state, the exhaust gas of the compressor is controlled to enter the indoor side heat exchanger and the outdoor side heat exchanger respectively to perform heating operation and defrosting operation, and based on the throttling and depressurization operation of the indoor side electronic expansion valve and the outdoor side electronic expansion valve, the operation cannot influence the normal operation of the indoor side air conditioner, when the second outdoor heat exchanger meets the defrosting exit condition, the second defrosting cycle is exited, when the heat accumulation capacity of the heat accumulator is larger than or equal to the first defrosting energy consumption, the air conditioner is controlled to reenter the first defrosting cycle, and when the second defrosting energy consumption is not larger than or equal to the first defrosting energy consumption, the air conditioner is controlled to enter the fifth defrosting cycle.
To complete the fourth defrost cycle, in some embodiments, the controller is configured to:
when the air conditioner enters the fourth defrosting cycle, defrosting the second row of outdoor heat exchangers based on the first row of outdoor heat exchangers, and judging whether the indoor side heat exchangers are in a heating running state or not;
if the indoor side heat exchanger is not in a heating running state, controlling the indoor side electronic expansion valve to be in a closing state, performing throttling and depressurization operation based on the outdoor side electronic expansion valve, exiting the fourth defrosting cycle when a preset defrosting exit condition is met, and controlling an air conditioner to enter the fifth defrosting cycle;
if the indoor side heat exchanger is in a heating operation state, the indoor side electronic expansion valve is controlled to be in an open state, compressor exhaust is controlled to enter the indoor side heat exchanger and the outdoor side heat exchanger respectively so as to perform heating operation and defrosting operation, throttling and depressurization operation is performed on the basis of the indoor side electronic expansion valve and the outdoor side electronic expansion valve, and when a preset defrosting exit condition is met, the fourth defrosting cycle is exited, and an air conditioner is controlled to enter the fifth defrosting cycle.
In this embodiment, when the air conditioner enters the fourth defrosting cycle, the four-way valve is not reversed, when the heat in the heat accumulator is insufficient to meet the heat absorption requirement of defrosting, the first outdoor heat exchanger absorbs heat to defrost the second outdoor heat exchanger, if the indoor heat exchanger is not in a heating operation state, the indoor electronic expansion valve is in a closed state, only the outdoor electronic expansion valve is used for performing throttling and depressurization operation, the defrosting cycle is realized through the control of each valve, and when the preset defrosting exit condition is met, the fourth defrosting cycle is exited, and the air conditioner is controlled to enter the fifth defrosting cycle; if the indoor side heat exchanger is in a heating running state, the indoor side electronic expansion valve is in an open state, compressor exhaust gas is controlled to enter the indoor side heat exchanger and the outdoor side heat exchanger respectively, throttling and depressurization operations are carried out on the basis of the indoor side electronic expansion valve and the outdoor side electronic expansion valve, after the compressor exhaust gas is condensed by the second row of outdoor heat exchangers, the compressor exhaust gas enters the first row of outdoor heat exchangers to absorb heat through the throttling and depressurization of the outdoor side electronic expansion valve, return air returns to the compressor through the gas-liquid separator, and after the second row of outdoor heat exchangers meet the defrosting exiting condition, the second row of outdoor heat exchangers are converted into a fifth defrosting cycle to defrost the first row of outdoor heat exchangers after the fourth defrosting cycle is completed.
To complete the fifth defrost cycle, in some embodiments, the controller is configured to:
when the air conditioner enters the fifth defrosting cycle, defrosting the first row of outdoor heat exchangers based on the second row of outdoor heat exchangers, and judging whether the indoor side heat exchangers are in a heating running state or not;
if the indoor side heat exchanger is not in a heating running state, controlling the indoor side electronic expansion valve to be in a closing state, performing throttling and depressurization operation based on the outdoor side electronic expansion valve, exiting the fifth defrosting cycle when a preset defrosting exit condition is met, and controlling an air conditioner to enter the heating cycle;
if the indoor side heat exchanger is in a heating operation state, the indoor side electronic expansion valve is controlled to be in an open state, compressor exhaust gas is controlled to enter the indoor side heat exchanger and the outdoor side heat exchanger respectively so as to perform heating operation and defrosting operation, throttling and depressurization operation is performed on the basis of the indoor side electronic expansion valve and the outdoor side electronic expansion valve, and when a preset defrosting exit condition is met, the fifth defrosting cycle is exited, and an air conditioner is controlled to enter the heating cycle.
In this embodiment, when the air conditioner enters the fifth defrosting cycle, the four-way valve is not reversed, when the heat in the heat accumulator is insufficient to meet the heat absorption requirement of defrosting, the first outdoor heat exchanger is defrosted by absorbing heat through the second outdoor heat exchanger, whether the indoor heat exchanger is in a heating operation state is judged, if the indoor heat exchanger is not in the heating operation state, the indoor electronic expansion valve is in a closed state, and throttling and depressurization are performed by means of the outdoor electronic expansion valve. Realizing defrosting circulation through control of each valve, exiting the fifth defrosting circulation when the preset defrosting exit condition is met, and controlling the air conditioner to enter the heating circulation; if the indoor side heat exchanger is in a heating running state, the indoor side electronic expansion valve is controlled to be in an open state, the exhaust gas of the compressor is controlled to enter the indoor side heat exchanger and the outdoor side heat exchanger respectively, after the exhaust gas of the compressor is condensed by the first row of outdoor heat exchangers, the exhaust gas of the compressor is throttled and depressurized by the outdoor side electronic expansion valve to enter the second row of outdoor heat exchangers to absorb heat, and the return gas returns to the compressor through the gas-liquid separator, and after the first row of outdoor heat exchangers meet the defrosting exiting condition, the fifth defrosting cycle is completed and the air conditioner is controlled to enter the heating cycle.
The invention discloses a multi-connected air conditioner and an air conditioner defrosting control method, wherein the multi-connected air conditioner comprises at least one compressor, at least one indoor side heat exchanger, at least two rows of outdoor heat exchangers, a phase-change heat storage device and a controller, wherein the controller is configured to: acquiring heat accumulation amount of a heat accumulator of the phase change heat accumulation device, wherein the first defrosting energy consumption of the first outdoor heat exchanger and the second defrosting energy consumption of the second outdoor heat exchanger are respectively acquired; and determining a defrosting cycle type based on the heat accumulation amount of the heat accumulator, the first defrosting energy consumption and the second defrosting energy consumption, and controlling the multi-connected air conditioner to enter the defrosting cycle type, so that the heating performance of the multi-connected air conditioner is not influenced in the defrosting process, and the comfort level of a user is improved.
In order to further explain the technical idea of the present invention, the present invention also provides a defrosting control method for an air conditioner, where the method is applied to a multi-connected air conditioner including at least one compressor, at least one indoor side heat exchanger, at least two rows of outdoor heat exchangers, a phase-change heat storage device and a controller, as shown in fig. 6, and the specific steps of the method are as follows:
s101, acquiring heat accumulation capacity of a heat accumulator of the phase change heat accumulation device, and enabling first defrosting energy consumption of a first row of outdoor heat exchangers and second defrosting energy consumption of a second row of outdoor heat exchangers.
In the step, the function of defrosting is realized by adding condensation waste heat in the recovery system of the phase-change heat storage device, and the first defrosting energy consumption of the first outdoor heat exchanger and the second defrosting energy consumption of the second outdoor heat exchanger are obtained.
S102, determining a defrosting cycle type based on the heat accumulation amount of the heat accumulator, the first defrosting energy consumption and the second defrosting energy consumption, and controlling the multi-connected air conditioner to enter the defrosting cycle type, wherein the defrosting cycle type comprises a first defrosting cycle, a second defrosting cycle, a third defrosting cycle, a fourth defrosting cycle and a fifth defrosting cycle.
In the step, the heat storage capacity of the heat accumulator of the phase change heat storage device is obtained, the defrosting cycle type is determined by the first defrosting energy consumption of the first outdoor heat exchanger and the second defrosting energy consumption of the second outdoor heat exchanger, the multi-connected air conditioner is controlled to enter the defrosting cycle type, the heating performance of the multi-connected air conditioner is ensured not to be influenced in the defrosting process through five defrosting cycles, and the comfort level of a user is improved.
In this embodiment, the indoor electronic expansion valve or the outdoor electronic expansion valve can perform throttling and depressurization, and the defrosting cycle is realized by controlling the opening of each valve of the electronic expansion valve, the four-way valve, the three-way valve and the electromagnetic valve in the defrosting start-to-stop process, so as to avoid the influence of the heating and heat storage process on the normal heating performance of the indoor side, heat is stored by adopting the waste heat after the indoor side condensation, the four-way valve in the system is not reversed during defrosting, thus the influence on the running state of the system is smaller, the time for recovering the heating running state of the indoor unit is shorter, the multi-split air-conditioning cycle system has five defrosting modes, and the heat storage capacity requirement on the heat storage device is lower because the defrosting of the heat storage device is combined with the alternate defrosting of the outdoor heat exchanger.
When the air conditioner meets preset defrosting conditions, judging whether the heat stored in the heat accumulator is larger than or equal to the sum of first defrosting energy consumption and second defrosting energy consumption, if so, defrosting the first outdoor heat exchanger and the second outdoor heat exchanger by utilizing the heat in the heat accumulator, judging whether the indoor side heat exchanger is in a heating running state, if not, closing the indoor side electronic expansion valve, performing throttling and depressurization operation based on the outdoor side electronic expansion valve, and entering a third defrosting cycle and a heating cycle; and if the indoor electronic expansion valve is in a heating running state, controlling the indoor electronic expansion valve to be opened, controlling the exhaust gas of the compressor to enter the indoor heat exchanger and the outdoor heat exchanger respectively so as to perform heating operation and defrosting operation, performing throttling and depressurization operation based on the indoor electronic expansion valve and the outdoor electronic expansion valve, and exiting the third defrosting cycle and entering the heating cycle when a preset defrosting exit condition is met. And if the heat storage capacity of the heat storage device is insufficient, determining the type of the defrosting cycle based on the heat storage capacity of the heat storage device and the first defrosting energy consumption, and determining the next defrosting cycle according to the determined type of the defrosting cycle.
Judging whether the heat accumulation amount of the heat accumulator is larger than or equal to the first defrosting energy consumption, if the heat accumulation amount of the heat accumulator is larger than or equal to the first defrosting energy consumption, defrosting the first outdoor heat exchanger based on the heat in the phase change heat accumulation device, entering a first defrosting cycle, judging whether the indoor heat exchanger is in a heating operation state, if the indoor heat exchanger is not in the heating operation state, performing throttling and depressurization operation based on the outdoor electronic expansion valve, exiting the first defrosting cycle when a preset defrosting exit condition is met, and entering a second defrosting cycle when the heat accumulation amount of the heat accumulator is larger than or equal to the second defrosting energy consumption; if the indoor heat exchanger is in a heating operation state, controlling the exhaust gas of the compressor to enter the indoor heat exchanger and the outdoor heat exchanger respectively so as to perform heating operation and defrosting operation, performing throttling and depressurization operation based on the indoor electronic expansion valve and the outdoor electronic expansion valve, exiting the first defrosting cycle when a preset defrosting exit condition is met, and entering the second defrosting cycle when the heat accumulation amount of the heat accumulator is greater than or equal to the second defrosting energy consumption.
Judging whether the heat accumulation amount of the heat accumulator is larger than or equal to second defrosting energy consumption, if the heat accumulation amount of the heat accumulator is larger than or equal to second defrosting energy consumption, defrosting the second outdoor heat exchanger by utilizing the heat in the heat accumulation device, and exiting the second defrosting cycle after the second outdoor heat exchanger meets the defrosting exiting condition; and if the heat accumulation amount of the heat accumulator is smaller than the second defrosting energy consumption, controlling the air conditioner to enter the first defrosting cycle based on the heat accumulation amount of the heat accumulator, and controlling the air conditioner to enter the fifth defrosting cycle when a preset exit condition is met.
When the air conditioner enters a second defrosting cycle, defrosting is carried out on the second outdoor heat exchanger based on heat in the phase change heat storage device, the four-way valve is used for defrosting in a non-reversing mode in the defrosting process, the electronic expansion valve is used for conducting throttling and depressurization operation, normal operation of the indoor air conditioner cannot be affected, when the second outdoor heat exchanger meets the defrosting exiting condition, the second defrosting cycle is exited, when the heat storage capacity of the heat storage device is larger than or equal to the first defrosting energy consumption, the air conditioner is controlled to reenter the first defrosting cycle, and when the second defrosting energy consumption is not larger than or equal to the first defrosting energy consumption, the air conditioner is controlled to enter the fifth defrosting cycle.
When the air conditioner enters the fourth defrosting cycle, the four-way valve is not reversed, when the heat in the heat accumulator is insufficient to meet the heat absorption requirement of defrosting, the second outdoor heat exchanger is defrosted through the heat absorption of the first outdoor heat exchanger, whether the indoor side heat exchanger is in a heating operation state or not is judged, if the indoor side heat exchanger is not in the heating operation state, the indoor side electronic expansion valve is in a fully closed state, throttling and depressurization are carried out only by the outdoor side electronic expansion valve, the defrosting cycle is realized through the control of each valve, the fourth defrosting cycle is exited when the preset defrosting exit condition is met, the air conditioner is controlled to enter the fifth defrosting cycle, if the indoor side electronic expansion valve is in the heating operation state, the indoor side heat exchanger is in an open state, the compressor exhaust is controlled to enter the indoor side heat exchanger and the outdoor side heat exchanger respectively, so that heating operation and defrosting operation are carried out, and the throttling and depressurization operation are carried out on the basis of the indoor side electronic expansion valve and the outdoor side electronic expansion valve, after the second outdoor side heat exchanger meets the exiting defrosting condition, the fourth defrosting cycle is completed, and then the first outdoor side heat exchanger is defrosted by switching to the fifth defrosting cycle.
When the air conditioner enters the fifth defrosting cycle, the four-way valve is not reversed, when the heat in the heat accumulator is insufficient to meet the heat absorption requirement of defrosting, the first outdoor heat exchanger is defrosted through the heat absorption of the second outdoor heat exchanger, whether the indoor side heat exchanger is in a heating operation state is judged, the defrosting cycle is realized through control of each valve, the air compressor exhaust is condensed through the first outdoor heat exchanger, then throttled and depressurized through the outdoor side electronic expansion valve, enters the second outdoor heat exchanger to absorb heat, return air returns to the compressor through the air-liquid separator, and after the first outdoor heat exchanger meets the defrosting exiting condition, the fifth defrosting cycle is completed and the air conditioner is controlled to enter the heating cycle.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present application, and are not limiting thereof; although the present application has been described in detail with reference to the foregoing embodiments, one of ordinary skill in the art will appreciate that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not drive the essence of the corresponding technical solutions to depart from the spirit and scope of the technical solutions of the embodiments of the present application.
Claims (10)
1. A multi-split air conditioner, comprising:
at least one compressor;
at least one indoor side heat exchanger comprising at least one indoor side electronic expansion valve;
at least two rows of outdoor heat exchangers, wherein each row of outdoor heat exchangers comprises an outdoor electronic expansion valve, and loops of the rows of outdoor heat exchangers are mutually independent;
a phase change heat storage device;
a controller configured to:
acquiring heat accumulation amount of a heat accumulator of the phase change heat accumulation device, wherein the first defrosting energy consumption of the first outdoor heat exchanger and the second defrosting energy consumption of the second outdoor heat exchanger are respectively acquired;
determining a defrosting cycle type based on the heat accumulation amount of the heat accumulator, the first defrosting energy consumption and the second defrosting energy consumption, and controlling the multi-connected air conditioner to enter the defrosting cycle type, wherein the defrosting cycle type comprises a first defrosting cycle, a second defrosting cycle, a third defrosting cycle, a fourth defrosting cycle and a fifth defrosting cycle;
The first defrosting cycle is specifically a circulating flow path which is used for correspondingly defrosting the first outdoor heat exchanger based on heat in the phase change heat storage device; the second defrosting cycle is specifically a cycle flow path corresponding to defrosting only the second-row outdoor heat exchanger based on the heat in the phase change heat storage device; the third defrosting cycle is specifically a circulating flow path corresponding to the time of defrosting the first outdoor heat exchanger and the second outdoor heat exchanger by utilizing the heat in the heat accumulator; the fourth defrosting cycle is specifically a circulating flow path which is used for correspondingly defrosting the second row of outdoor heat exchangers through heat absorption of the first row of outdoor heat exchangers; the fifth defrosting cycle is specifically a cycle flow path corresponding to defrosting the first row of outdoor heat exchangers through heat absorption of the second row of outdoor heat exchangers, and the four-way valve is used for defrosting without reversing in the cycle process.
2. The air conditioner of claim 1, wherein the controller is configured to: when the air conditioner meets a preset defrosting condition, judging whether the heat accumulation amount of the heat accumulator is larger than or equal to the sum of the first defrosting energy consumption and the second defrosting energy consumption;
if yes, controlling the air conditioner to enter the third defrosting cycle;
If not, determining the defrosting cycle type based on the heat accumulation amount of the heat accumulator and the first defrosting energy consumption.
3. The air conditioner of claim 2, wherein the controller is configured to:
when the air conditioner enters the third defrosting cycle, defrosting the first row of outdoor heat exchangers and the second row of outdoor heat exchangers based on heat in the phase change heat storage device, and judging whether the indoor side heat exchangers are in a heating running state or not;
if the indoor side heat exchanger is not in a heating running state, controlling the indoor side electronic expansion valve to be in a closing state, performing throttling and depressurization operation based on the outdoor side electronic expansion valve, and exiting the third defrosting cycle and entering the heating cycle when a preset defrosting exit condition is met;
if the indoor side heat exchanger is in a heating running state, the indoor side electronic expansion valve is controlled to be in an open state, and compressor exhaust gas is controlled to enter the indoor side heat exchanger and the outdoor side heat exchanger respectively so as to perform heating operation and defrosting operation, and based on the indoor side electronic expansion valve and the outdoor side electronic expansion valve, throttling and depressurization operation is performed, and when a preset defrosting exit condition is met, the third defrosting cycle is exited and the heating cycle is entered.
4. The air conditioner of claim 2, wherein the controller is further configured to:
judging whether the heat accumulation amount of the heat accumulator is larger than or equal to the first defrosting energy consumption;
if yes, controlling the air conditioner to enter the first defrosting cycle;
if not, determining the defrosting cycle type based on the heat accumulation amount of the heat accumulator and the second defrosting energy consumption.
5. The air conditioner of claim 4, wherein the controller is configured to:
when the air conditioner enters the first defrosting cycle, defrosting the first row of outdoor heat exchangers based on heat in the phase change heat storage device and judging whether the indoor side heat exchangers are in a heating running state or not;
if the indoor side heat exchanger is not in a heating running state, controlling the indoor side electronic expansion valve to be in a closing state, performing throttling and depressurization operation based on the outdoor side electronic expansion valve, exiting the first defrosting cycle when a preset defrosting exit condition is met, and entering the second defrosting cycle when the heat accumulation amount of the heat accumulator is greater than or equal to the second defrosting energy consumption;
if the indoor side heat exchanger is in a heating running state, the indoor side electronic expansion valve is controlled to be in an open state, and compressor exhaust gas is controlled to enter the indoor side heat exchanger and the outdoor side heat exchanger respectively so as to perform heating operation and defrosting operation, and based on the indoor side electronic expansion valve and the outdoor side electronic expansion valve, throttling and depressurization operation is performed, the first defrosting cycle is exited when a preset defrosting exit condition is met, and the second defrosting cycle is entered when the heat accumulation capacity of the heat accumulator is larger than or equal to the second defrosting energy consumption.
6. The air conditioner of claim 4, wherein the controller is configured to:
judging whether the heat accumulation amount of the heat accumulator is larger than or equal to the second defrosting energy consumption;
if yes, controlling the air conditioner to enter the second defrosting cycle;
and if not, controlling the air conditioner to reenter the first defrosting cycle, and controlling the air conditioner to enter the fifth defrosting cycle when a preset exit condition is met.
7. The air conditioner of claim 4, wherein the controller is configured to:
when the air conditioner enters the second defrosting cycle, defrosting the second outdoor heat exchanger based on heat in the phase change heat storage device, and judging whether the indoor side heat exchanger is in a heating running state or not;
if the indoor side heat exchanger is not in a heating running state, controlling the indoor side electronic expansion valve to be in a closing state, performing throttling and depressurization operation based on the outdoor side electronic expansion valve, exiting the second defrosting cycle when a preset defrosting exit condition is met, controlling the air conditioner to reenter the first defrosting cycle when the heat accumulation amount of the heat accumulator is more than or equal to the first defrosting energy consumption, and controlling the air conditioner to enter the fifth defrosting cycle when the second defrosting energy consumption is not more than or equal to the first defrosting energy consumption;
And if the indoor side heat exchanger is in a heating running state, controlling the indoor side electronic expansion valve to be in an opening state, controlling the exhaust gas of a compressor to enter the indoor side heat exchanger and the outdoor side heat exchanger respectively so as to perform heating operation and defrosting operation, performing throttling and depressurization operation based on the indoor side electronic expansion valve and the outdoor side electronic expansion valve, exiting the second defrosting cycle when a preset defrosting exit condition is met, controlling the air conditioner to reenter the first defrosting cycle when the heat accumulation capacity of the heat accumulator is greater than or equal to the first defrosting energy consumption, and controlling the air conditioner to enter the fifth defrosting cycle when the second defrosting energy consumption is not greater than or equal to the first defrosting energy consumption.
8. The air conditioner of claim 6, wherein the controller is configured to:
when the air conditioner enters the fourth defrosting cycle, defrosting the second row of outdoor heat exchangers based on the first row of outdoor heat exchangers, and judging whether the indoor side heat exchangers are in a heating running state or not;
if the indoor side heat exchanger is not in a heating running state, controlling the indoor side electronic expansion valve to be in a closing state, performing throttling and depressurization operation based on the outdoor side electronic expansion valve, exiting the fourth defrosting cycle when a preset defrosting exit condition is met, and controlling an air conditioner to enter the fifth defrosting cycle;
If the indoor side heat exchanger is in a heating operation state, the indoor side electronic expansion valve is controlled to be in an open state, compressor exhaust is controlled to enter the indoor side heat exchanger and the outdoor side heat exchanger respectively so as to perform heating operation and defrosting operation, throttling and depressurization operation is performed on the basis of the indoor side electronic expansion valve and the outdoor side electronic expansion valve, and when a preset defrosting exit condition is met, the fourth defrosting cycle is exited, and an air conditioner is controlled to enter the fifth defrosting cycle.
9. The air conditioner of claim 7, wherein the controller is configured to:
when the air conditioner enters the fifth defrosting cycle, defrosting the first row of outdoor heat exchangers based on the second row of outdoor heat exchangers, and judging whether the indoor side heat exchangers are in a heating running state or not;
if the indoor side heat exchanger is not in a heating running state, controlling the indoor side electronic expansion valve to be in a closing state, performing throttling and depressurization operation based on the outdoor side electronic expansion valve, exiting the fifth defrosting cycle when a preset defrosting exit condition is met, and controlling an air conditioner to enter the heating cycle;
If the indoor side heat exchanger is in a heating operation state, the indoor side electronic expansion valve is controlled to be in an open state, compressor exhaust gas is controlled to enter the indoor side heat exchanger and the outdoor side heat exchanger respectively so as to perform heating operation and defrosting operation, throttling and depressurization operation is performed on the basis of the indoor side electronic expansion valve and the outdoor side electronic expansion valve, and when a preset defrosting exit condition is met, the fifth defrosting cycle is exited, and an air conditioner is controlled to enter the heating cycle.
10. The utility model provides an air conditioner defrosting control method, is applied to including at least one compressor, at least one indoor side heat exchanger, at least two rows of outdoor heat exchangers, phase change heat accumulation device and controller in the multisystem air conditioner, said method includes:
acquiring heat accumulation amount of a heat accumulator of the phase change heat accumulation device, wherein the first defrosting energy consumption of the first outdoor heat exchanger and the second defrosting energy consumption of the second outdoor heat exchanger are respectively acquired;
determining a defrosting cycle type based on the heat accumulation amount of the heat accumulator, the first defrosting energy consumption and the second defrosting energy consumption, and controlling the multi-connected air conditioner to enter the defrosting cycle type, wherein the defrosting cycle type comprises a first defrosting cycle, a second defrosting cycle, a third defrosting cycle, a fourth defrosting cycle and a fifth defrosting cycle;
The first defrosting cycle is specifically a circulating flow path which is used for correspondingly defrosting the first outdoor heat exchanger based on heat in the phase change heat storage device; the second defrosting cycle is specifically a cycle flow path corresponding to defrosting only the second-row outdoor heat exchanger based on the heat in the phase change heat storage device; the third defrosting cycle is specifically a circulating flow path corresponding to the time of defrosting the first outdoor heat exchanger and the second outdoor heat exchanger by utilizing the heat in the heat accumulator; the fourth defrosting cycle is specifically a circulating flow path which is used for correspondingly defrosting the second row of outdoor heat exchangers through heat absorption of the first row of outdoor heat exchangers; the fifth defrosting cycle is specifically a cycle flow path corresponding to defrosting the first row of outdoor heat exchangers through heat absorption of the second row of outdoor heat exchangers, and the four-way valve is used for defrosting without reversing in the cycle process.
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Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012077941A (en) * | 2010-09-30 | 2012-04-19 | Panasonic Corp | Air conditioner |
| DE102012004094B3 (en) * | 2012-02-29 | 2013-06-13 | Glen Dimplex Deutschland Gmbh | Heat pump apparatus of heating system installed in e.g. single or multi-family dwelling, has control unit for passing refrigerant heated in heat accumulator through evaporator and defrosting refrigerant, in defrost mode |
| CN104101127A (en) * | 2013-04-01 | 2014-10-15 | 珠海格力电器股份有限公司 | VRV (Varied Refrigerant Volume) air conditioning system and VRV air conditioning defrosting control method |
| KR20150043873A (en) * | 2013-10-15 | 2015-04-23 | 엘지전자 주식회사 | Air Conditioner and Controlling method for the same |
| CN104807258A (en) * | 2015-05-25 | 2015-07-29 | 合肥美的暖通设备有限公司 | Air conditioning system and heat accumulation and defrosting device and method thereof |
| CN106705379A (en) * | 2017-01-10 | 2017-05-24 | 美的集团武汉制冷设备有限公司 | Defrosting control method, defrosting control system and air conditioner |
| CN111256290A (en) * | 2020-01-20 | 2020-06-09 | 珠海格力电器股份有限公司 | Heat pump air conditioner |
| WO2020129153A1 (en) * | 2018-12-18 | 2020-06-25 | 三菱電機株式会社 | Air conditioning device |
| CN111457466A (en) * | 2020-02-14 | 2020-07-28 | 青岛海信日立空调系统有限公司 | Air conditioning equipment |
| CN111623471A (en) * | 2020-05-29 | 2020-09-04 | Tcl空调器(中山)有限公司 | Defrosting method of air conditioner, air conditioner and computer readable storage medium |
| CN112050399A (en) * | 2020-09-08 | 2020-12-08 | 青岛海信日立空调系统有限公司 | Air conditioner |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6688555B2 (en) * | 2013-11-25 | 2020-04-28 | 三星電子株式会社Ｓａｍｓｕｎｇ Ｅｌｅｃｔｒｏｎｉｃｓ Ｃｏ．，Ｌｔｄ． | Air conditioner |
| US9857123B2 (en) * | 2015-08-06 | 2018-01-02 | John D. Mclaughlin | System and method for defrosting a condensor without external heating |
| JP6964755B2 (en) * | 2018-03-06 | 2021-11-10 | 三菱電機株式会社 | Air conditioner |
-
2021
- 2021-02-26 CN CN202110220222.4A patent/CN113074438B/en active Active
Patent Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012077941A (en) * | 2010-09-30 | 2012-04-19 | Panasonic Corp | Air conditioner |
| DE102012004094B3 (en) * | 2012-02-29 | 2013-06-13 | Glen Dimplex Deutschland Gmbh | Heat pump apparatus of heating system installed in e.g. single or multi-family dwelling, has control unit for passing refrigerant heated in heat accumulator through evaporator and defrosting refrigerant, in defrost mode |
| CN104101127A (en) * | 2013-04-01 | 2014-10-15 | 珠海格力电器股份有限公司 | VRV (Varied Refrigerant Volume) air conditioning system and VRV air conditioning defrosting control method |
| KR20150043873A (en) * | 2013-10-15 | 2015-04-23 | 엘지전자 주식회사 | Air Conditioner and Controlling method for the same |
| CN104807258A (en) * | 2015-05-25 | 2015-07-29 | 合肥美的暖通设备有限公司 | Air conditioning system and heat accumulation and defrosting device and method thereof |
| CN106705379A (en) * | 2017-01-10 | 2017-05-24 | 美的集团武汉制冷设备有限公司 | Defrosting control method, defrosting control system and air conditioner |
| WO2020129153A1 (en) * | 2018-12-18 | 2020-06-25 | 三菱電機株式会社 | Air conditioning device |
| CN111256290A (en) * | 2020-01-20 | 2020-06-09 | 珠海格力电器股份有限公司 | Heat pump air conditioner |
| CN111457466A (en) * | 2020-02-14 | 2020-07-28 | 青岛海信日立空调系统有限公司 | Air conditioning equipment |
| CN111623471A (en) * | 2020-05-29 | 2020-09-04 | Tcl空调器(中山)有限公司 | Defrosting method of air conditioner, air conditioner and computer readable storage medium |
| CN112050399A (en) * | 2020-09-08 | 2020-12-08 | 青岛海信日立空调系统有限公司 | Air conditioner |
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