CN112880131B - Method and device for defrosting control of air conditioning system and air conditioning system - Google Patents

Method and device for defrosting control of air conditioning system and air conditioning system Download PDF

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Publication number
CN112880131B
CN112880131B CN202110130362.2A CN202110130362A CN112880131B CN 112880131 B CN112880131 B CN 112880131B CN 202110130362 A CN202110130362 A CN 202110130362A CN 112880131 B CN112880131 B CN 112880131B
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China
Prior art keywords
defrosting
conditioning system
heat exchanger
air conditioning
refrigerant
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CN202110130362.2A
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Chinese (zh)
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CN112880131A (en
Inventor
汪亚东
王若峰
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Qingdao Haier Air Conditioner Gen Corp Ltd
Qingdao Haier Air Conditioning Electric Co Ltd
Haier Smart Home Co Ltd
Original Assignee
Qingdao Haier Air Conditioner Gen Corp Ltd
Qingdao Haier Air Conditioning Electric Co Ltd
Haier Smart Home Co Ltd
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Priority to CN202110130362.2A priority Critical patent/CN112880131B/en
Publication of CN112880131A publication Critical patent/CN112880131A/en
Priority to PCT/CN2021/121628 priority patent/WO2022160764A1/en
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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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
    • F24F11/63—Electronic processing
    • F24F11/65—Electronic processing for selecting an operating mode
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/70—Control systems characterised by their outputs; Constructional details thereof
    • F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
    • F24F11/83—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B47/00—Arrangements for preventing or removing deposits or corrosion, not provided for in another subclass
    • F25B47/02—Defrosting cycles
    • F25B47/022—Defrosting cycles hot gas defrosting
    • F25B47/025—Defrosting cycles hot gas defrosting by reversing the cycle
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2347/00—Details for preventing or removing deposits or corrosion
    • F25B2347/02—Details of defrosting cycles
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
    • Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating

Abstract

The application relates to the technical field of smart families and discloses a method for defrosting control of an air conditioning system, which comprises the following steps: when the air conditioning system runs in a heating mode, determining to trigger to enter a defrosting mode; the heating mode comprises that the first refrigerant circulation loop conveys refrigerants according to the flow direction of heating refrigerants, the second refrigerant circulation loop is in a conduction state, and the refrigerant flow of the first refrigerant circulation loop is larger than the refrigerant flow of the second refrigerant circulation return; and controlling the refrigerant flow of the first refrigerant circulation loop to be less than or equal to the refrigerant flow of the second refrigerant circulation loop so as to enable the air-conditioning system to operate in a defrosting mode. The method provided by the embodiment of the disclosure enables the indoor environment fluctuation to be small in the whole operation process of the air conditioning system, the indoor temperature to be maintained in a comfortable temperature range of a user, and the use experience of the user is improved. The application also discloses a device and an air conditioning system for the defrosting control of the air conditioning system.

Description

Method and device for defrosting control of air conditioning system and air conditioning system
Technical Field
The application relates to the technical field of smart families, in particular to a method and a device for defrosting control of an air conditioning system and the air conditioning system.
Background
At present, along with the improvement of living standard of people, air conditioning system equipment has also gone into thousands of households, the use of household air conditioning systems and central air conditioning systems is more and more common, the requirement of users on the comfort level of the air conditioning systems is more and more high, the problems existing in the use process of the air conditioning systems are also gradually exposed, and one of the problems is the problem that an outdoor unit of the air conditioning system is frosted and frozen when the air conditioning system operates in severe cold climate. When the air conditioning system operates in a low-temperature area or an area with large wind and snow, the heat exchanger of the outdoor unit absorbs heat from the outdoor environment, the temperature of the heat exchanger is low, water vapor in the outdoor environment can be gradually condensed on the surface of the outdoor heat exchanger to form a frost layer, the frost layer can block heat exchange between an internal refrigerant and the outdoor environment, and the refrigerating efficiency of the air conditioning system is reduced.
In order to ensure the heating effect of the air conditioning system, the conventional air conditioning system is generally provided with a defrosting function, and when the air conditioning system is frosted, the defrosting function is started to realize the function of removing a frost layer.
In the process of implementing the embodiments of the present disclosure, it is found that at least the following problems exist in the related art: the defrosting function of the existing air conditioning system generally adopts a reverse defrosting mode, namely, an air conditioning system is converted into a refrigeration mode, a heat exchanger of an outdoor unit is in a heat release state, and then frost of the outdoor unit is melted after absorbing heat. However, when the defrosting function is operated, no warm air is blown out from the air outlet of the indoor unit, and even cold air can be blown out from the air outlet of the indoor unit, so that the indoor environment temperature is reduced, and the use experience of a user is influenced.
Disclosure of Invention
The following presents a simplified summary in order to provide a basic understanding of some aspects of the disclosed embodiments. This summary is not an extensive overview nor is intended to identify key/critical elements or to delineate the scope of such embodiments but rather as a prelude to the more detailed description that is presented later.
The embodiment of the disclosure provides a method and a device for defrosting control of an air conditioning system and the air conditioning system, which aim to solve the technical problem that the existing defrosting control operation mode of the air conditioning system cannot ensure comfortable indoor environment temperature.
In some embodiments, the method comprises:
when the air conditioning system runs in a heating mode, determining to trigger to enter a defrosting mode; the heating mode comprises that the first refrigerant circulation loop conveys refrigerants according to the flow direction of heating refrigerants, the second refrigerant circulation loop is in a conduction state, and the refrigerant flow of the first refrigerant circulation loop is larger than the refrigerant flow of the second refrigerant circulation return;
and controlling the refrigerant flow of the first refrigerant circulation loop to be less than or equal to the refrigerant flow of the second refrigerant circulation loop so as to enable the air-conditioning system to operate in a defrosting mode.
In some embodiments, the apparatus comprises:
a defrosting determination module configured to determine to trigger entering of a defrosting mode when the air conditioning system operates a heating mode; the heating mode comprises that the first refrigerant circulation loop conveys refrigerants according to the flow direction of heating refrigerants, the second refrigerant circulation loop is in a conduction state, and the refrigerant flow of the first refrigerant circulation loop is larger than the refrigerant flow of the second refrigerant circulation return;
and the defrosting switching module is configured to control the refrigerant flow of the first refrigerant circulation loop to be less than or equal to the refrigerant flow of the second refrigerant circulation loop so as to enable the air-conditioning system to operate in a defrosting mode.
In some embodiments, the apparatus comprises:
a processor and a memory storing program instructions, the processor being configured to, upon execution of the program instructions, perform the method for air conditioning system defrost control illustrated in the above embodiments.
In some embodiments, the air conditioning system includes a compressor, a first circulation assembly and a second circulation assembly, wherein the first circulation assembly includes a first indoor heat exchanger, a first outdoor heat exchanger, a first throttling device and a four-way valve, the first circulation assembly is connected with the compressor to form a first refrigerant circulation loop, the second circulation assembly includes a second indoor heat exchanger, a second outdoor heat exchanger and a second throttling device, the second circulation assembly is connected with the compressor to form a second refrigerant circulation loop, wherein the second indoor heat exchanger is communicated with a return air port of the compressor, the second outdoor heat exchanger is communicated with an exhaust port of the compressor, and the first outdoor heat exchanger and the second outdoor heat exchanger are adjacently disposed;
the air conditioning system further includes a controller for: when the air conditioning system runs in a heating mode, determining to trigger to enter a defrosting mode; the heating mode comprises that the first refrigerant circulation loop conveys refrigerants according to the flow direction of heating refrigerants, the second refrigerant circulation loop is in a conduction state, and the refrigerant flow of the first refrigerant circulation loop is larger than the refrigerant flow of the second refrigerant circulation return; and controlling the refrigerant flow of the first refrigerant circulation loop to be less than or equal to the refrigerant flow of the second refrigerant circulation loop so as to enable the air-conditioning system to operate in a defrosting mode.
The method and the device for controlling defrosting of the air conditioning system and the air conditioning system provided by the embodiment of the disclosure can realize the following technical effects:
the defrosting control method of the air conditioning system provided by the embodiment of the disclosure is based on a set of newly added refrigerant circulation loop on the refrigerant circulation loop of the original air conditioning system, the newly added refrigerant circulation loop can respectively utilize the newly added outdoor heat exchanger to emit refrigerant heat to the surrounding environment of the outdoor heat exchanger of the original refrigerant circulation loop with different heat dissipation efficiencies when the air conditioning system operates in the heating and defrosting modes, so that the icing rate of the original outdoor heat exchanger during the operation in the heating mode can be delayed, the condensed frost can be heated and melted when the heating mode operates, and the refrigerant circulation loop of the original air conditioning system can normally heat the indoor environment, so that the indoor environment fluctuation is small in the whole operation process of the air conditioning system, the indoor temperature can be maintained in a comfortable temperature range of a user, and the use experience of the user is improved.
The foregoing general description and the following description are exemplary and explanatory only and are not restrictive of the application.
Drawings
One or more embodiments are illustrated by way of example in the accompanying drawings, which correspond to the accompanying drawings and not in limitation thereof, in which elements having the same reference numeral designations are shown as like elements and not in limitation thereof, and wherein:
fig. 1 is a schematic view illustrating a refrigerant cycle of an air conditioning system in a cooling mode according to an embodiment of the present disclosure;
fig. 2 is a schematic diagram of refrigerant circulation in a heating mode of the air conditioning system according to an embodiment of the disclosure;
fig. 3 is a schematic diagram illustrating a refrigerant cycle of an air conditioning system in a defrosting mode according to an embodiment of the disclosure;
fig. 4 is a schematic diagram illustrating a refrigerant cycle in a defrosting mode of an air conditioning system according to another embodiment of the present disclosure;
FIG. 5 is a schematic diagram of a method for defrost control of an air conditioning system according to an embodiment of the present disclosure;
FIG. 6 is a schematic diagram of another method for defrost control of an air conditioning system provided by an embodiment of the present disclosure;
FIG. 7 is a schematic diagram of an apparatus for defrost control of an air conditioning system according to an embodiment of the present disclosure;
fig. 8 is a schematic diagram of another device for controlling defrosting of an air conditioning system according to an embodiment of the present disclosure.
Detailed Description
So that the manner in which the features and elements of the disclosed embodiments can be understood in detail, a more particular description of the disclosed embodiments, briefly summarized above, may be had by reference to the embodiments, some of which are illustrated in the appended drawings. In the following description of the technology, for purposes of explanation, numerous details are set forth in order to provide a thorough understanding of the disclosed embodiments. However, one or more embodiments may be practiced without these details. In other instances, well-known structures and devices may be shown in simplified form in order to simplify the drawing.
The terms "first," "second," and the like in the description and in the claims, and the above-described drawings of embodiments of the present disclosure, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It should be understood that the data so used may be interchanged as appropriate for the embodiments of the disclosure described herein. Furthermore, the terms "include" and "have," as well as any variations thereof, are intended to cover a non-exclusive inclusion.
The term "plurality" means two or more unless otherwise specified.
In the embodiment of the present disclosure, the character "/" indicates that the preceding and following objects are in an or relationship. For example, A/B represents: a or B.
The term "and/or" is an associative relationship that describes objects, meaning that three relationships may exist. For example, a and/or B, represents: a or B, or A and B.
As shown in fig. 1 to 4, an embodiment of the present disclosure provides an air conditioning system including an indoor unit, an outdoor unit, a compressor 31, a first circulation assembly, and a second circulation assembly. The compressor 32 is disposed in the outdoor unit body; the first circulation assembly comprises a first indoor heat exchanger 11, a first outdoor heat exchanger 12, a first throttling device 13 and a four-way valve 24; the first circulation component is connected with the compressor 3 to form a first refrigerant circulation loop; the second circulation module includes a second indoor heat exchanger 21, a second outdoor heat exchanger 22, and a second throttling device 23; the second circulation component is connected with the compressor 3 to form a second refrigerant circulation loop, wherein the second indoor heat exchanger 21 is communicated with a return air port of the compressor 3, and the second outdoor heat exchanger 22 is communicated with an exhaust port of the compressor 3.
In some alternative embodiments, the first indoor heat exchanger 11 and the second indoor heat exchanger 21 are commonly disposed in the indoor machine body, and the first indoor heat exchanger 11 and the second indoor heat exchanger 21 are respectively disposed in two independent air ducts in the indoor machine body 31, and each indoor heat exchanger can independently exchange heat with indoor air.
In still other alternative embodiments, the first outdoor heat exchanger 12 and the second outdoor heat exchanger 22 are disposed adjacent. Optionally, the first outdoor heat exchanger 12 and the second outdoor heat exchanger 22 are adjacently disposed, or the first outdoor heat exchanger 12 and the second outdoor heat exchanger 22 are adjacently disposed at a set interval.
Optionally, with the air conditioning system provided in the embodiment of the present disclosure, when the first refrigerant circulation loop is in the passage state, the air conditioning system may implement a basic cooling/heating function; when the second refrigerant circulation loop is in the on state, the air conditioning system can achieve the defrosting function of the outdoor unit of the first refrigerant circulation loop through the second refrigerant circulation loop. And the refrigerant circulation in the air conditioning system is simple and reasonable in flow distribution, and the manufacturing cost is low.
In some embodiments, as shown in fig. 1 (the direction of the arrow in the figure indicates the flow direction of the refrigerant), when the first refrigerant circulation loop flows in the direction of the cooling refrigerant, the high-temperature and high-pressure gaseous refrigerant enters the first outdoor heat exchanger 12 from the exhaust port of the compressor 3, exchanges heat with outdoor air and releases heat, then flows into the first indoor heat exchanger 11, exchanges heat with air blown through the first indoor heat exchanger 11 and absorbs heat of the air, and finally flows into the compressor 3 through the return port of the compressor 3. In this way, the first refrigerant circulation circuit can perform a cooling function.
On the contrary, as shown in fig. 2, when the first refrigerant circulation circuit flows in the heating refrigerant flow direction, the refrigerant flow direction is opposite to the cooling flow direction, and at this time, the first outdoor heat exchanger 12 exchanges heat with outdoor air and absorbs heat, and the first indoor heat exchanger 11 exchanges heat with indoor air and releases heat, so that the heating function can be realized by the first refrigerant circulation circuit.
In the operation process of the heating function, the temperature of the first outdoor heat exchanger 12 of the outdoor unit is low, and water vapor in outdoor air is gradually condensed on the outdoor unit in a long-time use state, so that the problems of frost condensation and icing are caused.
When the second refrigerant circulation circuit is in a conduction state, the high-temperature and high-pressure gaseous refrigerant flows out from the exhaust port of the compressor 3, then enters the second outdoor heat exchanger 22, exchanges heat with outdoor air in the second outdoor heat exchanger 22 and releases heat, and the released heat can improve the temperature of the surrounding environment, particularly the temperature of the surrounding environment of the first outdoor heat exchanger 21 arranged adjacent to the second outdoor heat exchanger; and then flows into the second indoor heat exchanger 21, and the refrigerant exchanges heat with air blown through the second indoor heat exchanger 21 to absorb heat of the air, and finally flows into the compressor 3 from a return port of the compressor 3.
Optionally, when the air conditioning system utilizes the second refrigerant circulation loop to perform temperature rise and defrost on the first outdoor heat exchanger 21, the first refrigerant circulation loop may be in a blocking state, as shown in fig. 3; alternatively, the first refrigerant circulation circuit may be in a conduction state and still flow in the heating refrigerant flow direction, as shown in fig. 4, at this time, the first indoor heat exchanger 11 of the first refrigerant circulation circuit can exchange heat with the indoor air to continue to deliver heat to the indoor environment.
In some embodiments, the first throttling device 13 comprises a capillary tube and a switching valve, or, an electronic expansion valve; and/or the second throttling means 23 comprise a capillary tube and a switching valve, or alternatively, an electronic expansion valve. The throttling device is mainly used for adjusting the refrigerant flow of the first refrigerant circulation loop and the second refrigerant circulation loop and the pressure of the air-conditioning system.
Optionally, the first throttling device 13 and the second throttling device 23 may further include a throttle valve and a thermal expansion valve.
Optionally, an electronic expansion valve, a switch valve and a capillary tube are sequentially connected between the first indoor heat exchanger 11 and the first outdoor heat exchanger 12, and between the second indoor heat exchanger 21 and the second outdoor heat exchanger 22.
In the above embodiment, further, the electronic expansion valve may be electromagnetic or electric.
In the above embodiment, optionally, the inner fan includes a first fan and a second fan. The first inner fan is arranged corresponding to the first indoor heat exchanger 11, and the second inner fan is arranged corresponding to the second indoor heat exchanger 21. Thus, under the action of the first inner fan, air in the air duct rapidly exchanges heat through the first indoor heat exchanger 11; under the effect of fan in the second, the air in the wind channel carries out the heat exchange through second indoor heat exchanger 21 fast, and the rotational speed of fan can influence the heat exchange efficiency between air and the second indoor heat exchanger 21 in the second, and both approximate positive correlation.
Fig. 5 is a schematic diagram of a method for defrosting control of an air conditioning system according to an embodiment of the present disclosure.
As shown in fig. 5, the embodiment of the present disclosure provides a method for controlling defrosting of an air conditioning system, which may be applied to the air conditioning system as shown in the embodiments of fig. 1 to 4, and can effectively reduce adverse effects such as reduction of indoor temperature and large fluctuation during defrosting operation of the air conditioning system; specifically, the control steps of the method comprise:
s01, when the air conditioning system runs in a heating mode, determining to trigger to enter a defrosting mode;
in some embodiments, in the heating mode, the first refrigerant circulation circuit conveys the refrigerant according to the heating refrigerant flow direction, and the second refrigerant circulation circuit is in a conduction state, i.e., the state of the air conditioning system shown in the foregoing fig. 4 embodiment.
Here, in the case where the first refrigerant circulation circuit conveys the refrigerant in the heating refrigerant flow direction, the high-temperature refrigerant flows out from the discharge port of the compressor, first enters the first indoor heat exchanger to release heat to the indoor environment, and then the low-temperature refrigerant flows into the first outdoor heat exchanger to absorb heat from the outdoor environment. And under the condition that the second refrigerant circulation loop is in a conducting state, the high-temperature refrigerant flows out of the exhaust port of the compressor, then enters the second outdoor heat exchanger, releases heat to the surrounding outdoor environment, then flows into the second indoor heat exchanger and finally flows back to the compressor.
Because the first outdoor heat exchanger and the second outdoor heat exchanger are arranged adjacently, the heat released by the second outdoor heat exchanger can improve the ambient temperature condition of the first outdoor heat exchanger, improve the ambient temperature, and play a role in delaying the frost condensation speed of the outer surface of the first outdoor heat exchanger, thereby effectively reducing the situations that the frost condensation speed of the outer surface of the first outdoor heat exchanger is too fast and too much when the first outdoor heat exchanger operates for a long time in a heating mode.
In this embodiment, the refrigerant flow rate of the first refrigerant cycle circuit is set to be greater than the refrigerant flow rate of the second refrigerant cycle return.
The refrigerant flow of the first refrigerant circulation loop and the refrigerant flow of the second refrigerant circulation loop are obtained by shunting from the compressor, so the amount of the refrigerant shunted by each refrigerant circulation loop can influence the heating performance and the frost formation delaying performance corresponding to the refrigerant circulation loop. In the heating mode in this embodiment, the heating of the air conditioning system is mainly performed, so that the refrigerant flow rate of the first refrigerant circulation loop is set to a larger value, so that the refrigerant flow rate can be divided to obtain more high-temperature refrigerants, and the heating effect on the indoor environment can be further ensured.
The second refrigerant circulation loop is conveyed at a low refrigerant flow rate, so that the frosting speed of the first outdoor heat exchanger is delayed to a certain extent, and the interference influence of the conduction of the second refrigerant circulation flow path on the heating performance of the air conditioning system can be weakened.
Optionally, the refrigerant flow rate of the first refrigerant circulation loop may be controlled by the first throttling device, and the on-off state of the second refrigerant circulation loop is controlled by the second throttling device. For example, in the air conditioning system operation heating mode, the opening degree of the first throttling device is 1/2K, the opening degree of the second throttling device is 1/10K, and the maximum opening degree upper limit of the first throttling device and the maximum opening degree upper limit of the second throttling device are both K.
In some optional embodiments, the step of "determining to trigger entering the defrost mode" in step S01 includes: an activation instruction for obtaining a defrosting mode input by a user is determined.
In this embodiment, the air conditioning system may send a control command to an indoor unit of the air conditioning system through a remote controller or a control panel, and the air conditioning system may execute an action corresponding to the control command after obtaining the relevant control command. Here, the remote controller or the control panel shows that the control command options to the user include the start command of the above-described defrosting mode.
In further alternative embodiments, the step of "determining to trigger entering the defrost mode" in step S01 includes: detecting the current outdoor environment temperature; and if the current outdoor environment temperature is less than the outer ring temperature threshold value, determining to trigger entering a defrosting mode.
In this embodiment, the outdoor unit side of the air conditioning system is provided with a temperature sensor, which can be used to detect the real-time temperature of the outdoor environment where the outdoor unit is located. In this embodiment, the real-time temperature of the outdoor environment detected by the temperature sensor is used to determine whether to trigger the defrost mode.
Optionally, the outer ring temperature threshold is a preset temperature value, and the temperature value may be used to represent whether the outdoor unit of the air conditioning system is prone to frost condensation within an upper temperature range and a lower temperature range of the temperature value, and specifically, when the outdoor environment temperature is lower than the outer ring temperature threshold, the outdoor unit of the air conditioning system is prone to frost condensation under the outdoor environment temperature condition, so that the adverse effect of frosting of the outdoor heat exchanger on the performance of the air conditioning system is reduced in the defrosting mode.
And S02, controlling the refrigerant flow of the first refrigerant circulation loop to be less than or equal to the refrigerant flow of the second refrigerant circulation loop, so that the air conditioning system operates in a defrosting mode.
In some optional embodiments, in the defrosting mode of the air conditioning system in step S02, the first refrigerant circulation circuit and the second refrigerant circulation circuit still maintain the original conduction state and the refrigerant flow direction is unchanged, that is, the state of the air conditioning system shown in the embodiment of fig. 4 is described above.
The refrigerant flow of the first refrigerant circulation loop can be adjusted by the first throttling device; and/or the refrigerant flow rate of the second refrigerant circulation loop can be adjusted by the second throttling device.
Optionally, in step S02, the opening degree of the first throttling device of the first refrigerant circulation loop may be kept unchanged, that is, the opening degree state of the first throttling device in the heating mode may be kept; the opening degree of the second throttling device is increased to be larger than that of the first throttling device, so that the flow of the refrigerant distributed to the first refrigerant circulation loop is smaller than or equal to that of the refrigerant distributed to the second refrigerant circulation loop. For example, in the defrosting mode, the opening degree of the first throttle device is maintained at 1/2K, and the opening degree of the second throttle device is adjusted to 3/5K.
The mode can be used for the conditions that the running power of the compressor is high and the refrigerant flow is high, the high-temperature refrigerant discharged by the compressor is high, the opening degree of the second throttling device is increased by keeping the opening degree of the first throttling device unchanged, so that the refrigerant quantity of the first refrigerant circulation loop is unchanged or slightly changed, the heating performance is kept stable, the refrigerant quantity of the second refrigerant circulation loop is increased, and the defrosting effect of the first refrigerant circulation loop on the first outdoor heat exchanger is improved.
Alternatively, in step S02, the opening degree of the second throttle device of the second refrigerant circulation circuit may be maintained, that is, the opening degree of the second throttle device may be maintained in the heating mode; the opening degree of the second throttling device is larger than that of the first throttling device by reducing the opening degree of the first throttling device, so that the flow of the refrigerant distributed to the first refrigerant circulation loop is smaller than or equal to that of the refrigerant distributed to the second refrigerant circulation loop. For example, in the defrosting mode, the opening degree of the second throttle device is maintained at 1/10K, and the opening degree of the first throttle device is adjusted to be 1/15K.
The mode can be used for reducing the opening degree of the first throttling device by keeping the opening degree of the second throttling device unchanged when the running power of the compressor is low and the flow rate of the refrigerant is low or the indoor environment temperature is high and the indoor unit is in a standby state, so that more refrigerants are shunted to the second refrigerant circulation loop for defrosting.
Optionally, when step S02 is executed, the opening degrees of the two first throttling devices of the two refrigerant circulation loops may be adjusted at the same time, such as the opening degree of the first throttling device is adjusted down and the opening degree of the second throttling device is adjusted up; or simultaneously increasing the opening degrees of the first throttling device and the second throttling device, wherein the opening degree of the first throttling device after adjustment is smaller than the opening degree of the second throttling device; or, the opening degrees of the first throttling device and the second throttling device are simultaneously reduced, and the opening degree of the first throttling device after the adjustment is smaller than the opening degree of the second throttling device.
The defrosting control method of the air conditioning system provided by the embodiment of the disclosure is based on a set of newly added refrigerant circulation loop on the refrigerant circulation loop of the original air conditioning system, and the newly added refrigerant circulation loop can respectively utilize the newly added outdoor heat exchanger to emit refrigerant heat to the surrounding environment of the outdoor heat exchanger of the original refrigerant circulation loop with different heat dissipation efficiencies when the air conditioning system operates in the heating and defrosting modes, so that the icing rate of the original outdoor heat exchanger during the operation in the heating mode can be delayed, the condensed frost can be heated and melted when the heating mode operates, and the refrigerant circulation loop of the original air conditioning system can normally heat the indoor environment, so that the indoor environment fluctuation is small in the whole operation process of the air conditioning system, the indoor temperature can be maintained in a comfortable temperature range of a user, and the use experience of the user is improved.
In some optional embodiments, the heating mode further comprises: the first inner fan rotates at a speed of R1 Heating apparatus In operation, the second inner fan speed is at speed R2 Heating apparatus Operation, R1 Heating apparatus ＞R2 Heating apparatus 。
In this embodiment, in the heating mode, the second refrigerant circulation circuit is in the on state and the second indoor heat exchanger absorbs heat from the indoor environment, which may result in a reduction in the indoor environment temperature and a loss in the heating capacity of the first refrigerant circulation circuit, and therefore the rotation speed of the second inner fan is set to be less than that of the first inner fan in this embodiment of the present application, so as to reduce the flow of the indoor air relative to the second indoor heat exchanger and slow down the heat exchange efficiency between the second indoor heat exchanger and the indoor air. Meanwhile, the second inner fan runs at a lower rotating speed, and the low-temperature refrigerant in the second indoor heat exchanger can absorb heat and be vaporized to a certain extent, so that the amount of the liquid refrigerant flowing back to the compressor is reduced, and the liquid problem is reduced.
For example, in the heating mode, the rotating speed R1 of the first inner fan Heating apparatus The rotating speed R2 of the second inner fan is set to 400R/min Heating apparatus Set at 100 r/min.
In some optional embodiments, after determining that the entering of the defrosting mode is triggered, the method further includes: controlling the first inner fan to rotate at a rotating speed R1 Defrosting In operation, the second inner fan speed is at speed R2 Defrosting Operation, R1 Defrosting ≥R2 Defrosting And R1 Defrosting ≥R1 Heating apparatus 。
In this embodiment, in the defrosting mode, the rotation speed of the first internal fan is increased and is greater than the rotation speed in the heating mode, so that the heat exchange rate between the indoor air and the first indoor heat exchanger can be increased, and since the refrigerant flow rate of the second refrigerant circulation loop is greater than or equal to the refrigerant flow rate of the first refrigerant circulation loop, the heating capacity of the first refrigerant circulation loop in unit time is likely to decrease, so that the heating capacity of the air conditioning system in unit time is increased by increasing the rotation speed of the first internal fan, and the heating performance of the air conditioning system to the indoor environment is not changed or is not decreased too much in the refrigerant distribution state of the defrosting mode.
For example, in the defrosting mode, the rotating speed R1 of the first inner fan Defrosting device Set to 500R/min and the rotating speed R2 of the second inner fan Heating apparatus Set at 200 r/min.
In some optional embodiments, the air conditioning system operates in a heating mode, and further includes: acquiring the air outlet temperature of the first indoor heat exchanger side when the air conditioning system operates in a heating mode; if the air outlet temperature is lower than the set air outlet temperature threshold, the rotating speed of the first inner fan is increased and/or the rotating speed of the second inner fan is reduced, so that the air outlet temperature reaches the set air outlet temperature threshold.
In this embodiment, a temperature sensor is disposed at an indoor unit side of the air conditioning system, and the temperature sensor is correspondingly disposed on an air outlet path at the first indoor heat exchanger side, and can be used to detect a real-time temperature of air blown out after heat exchange with the first indoor heat exchanger, that is, an air outlet temperature at the first indoor heat exchanger side; the change condition of the heat release efficiency of the first indoor heat exchanger to the indoor air can be reflected by the change of the air outlet temperature.
Optionally, the set outlet air temperature threshold is a threshold value used for representing that the indoor environment temperature is kept within a small temperature fluctuation range in the heating mode operation process, and when the outlet air temperature of the indoor unit is smaller than the set outlet air temperature threshold, it is reflected that the heat absorption capacity of the second indoor heat exchanger from the indoor environment is large, and the overall heating efficiency of the air conditioning system is affected. Therefore, the rotating speed of the first internal fan needs to be increased to increase the heat release of the first indoor heat exchanger to the indoor environment, and/or the rotating speed of the second internal fan needs to be decreased to decrease the heat absorption of the second indoor heat exchanger to the indoor environment. Therefore, the rotating speed of one or two inner fans is adjusted, so that the air outlet temperature reaches the set air outlet temperature threshold value.
In some embodiments, the method for defrosting control of an air conditioning system of the present application further comprises: after the defrosting mode is determined to be triggered, the indoor environment temperature of the air conditioning system in the defrosting mode is obtained; if the temperature change rate of the indoor environment temperature is larger than or equal to the set temperature change rate, the rotating speed of the first inner fan is increased and/or the rotating speed of the second inner fan is reduced, so that the temperature change rate of the indoor environment temperature is smaller than the set temperature change rate.
In this embodiment, a temperature sensor is disposed on the indoor unit side of the air conditioning system, and the temperature sensor can be used for measuring the real-time temperature of the indoor environment in which the indoor unit is located, i.e. the indoor environment temperature; the temperature change rate of the indoor environment temperature refers to a temperature change range within a certain time, which can reflect the temperature change condition of the indoor environment in the defrosting mode.
When the temperature change rate of the indoor environment temperature is greater than or equal to the set temperature change rate, the influence of the defrosting mode of the air conditioning system on the temperature change caused by the indoor environment is obvious, and the stability of the indoor environment is influenced. Therefore, the rotating speed of the first internal fan needs to be increased to increase the heat release of the first indoor heat exchanger to the indoor environment, and/or the rotating speed of the second internal fan needs to be decreased to decrease the heat absorption of the second indoor heat exchanger to the indoor environment. Therefore, the rotating speed of one or two inner fans is adjusted, so that the temperature change rate of the indoor environment temperature is smaller than the set temperature change rate.
In some embodiments, the method for air conditioning system defrost control of the present application further comprises: acquiring the outdoor environment temperature of the air conditioning system in the heating mode; and adjusting the refrigerant flow of the second refrigerant circulation loop in the heating mode according to the outdoor environment temperature.
Optionally, a temperature sensor is disposed on the outdoor side of the air conditioning system, and the temperature sensor is configured to detect a real-time temperature of the outdoor side as the outdoor ambient temperature.
Here, since the second outdoor heat exchanger is also disposed at the outdoor side, the amount of heat transferred to the first outdoor heat exchanger can be affected by the ambient temperature, and when the outdoor ambient temperature is low, more heat is radiated to the outdoor environment, and the amount of heat actually used for delaying frosting of the first outdoor heat exchanger is less, in this embodiment, the refrigerant flow rate of the second refrigerant circulation loop in the heating mode is adjusted according to the outdoor ambient temperature, so as to ensure the effect of delaying frosting of the second refrigerant circulation loop in the heating mode.
Optionally, the air conditioning system presets an association relationship, where the association relationship is a correspondence relationship between the outdoor ambient temperature and the refrigerant regulation amount of the second refrigerant circulation loop; therefore, after the real-time outdoor environment temperature is obtained, the corresponding refrigerant regulating quantity can be found according to the incidence relation, and the refrigerant flow of the second refrigerant circulation loop is further adjusted.
In the correlation relationship, the outdoor ambient temperature and the refrigerant regulation amount are in a negative correlation relationship, that is, the lower the outdoor ambient temperature is, the larger the refrigerant regulation amount is, so that the heat loss caused by the low outdoor ambient temperature is compensated by the increased flow rate of the divided refrigerant.
Fig. 6 is a schematic diagram of another method for defrosting control of an air conditioning system according to an embodiment of the present disclosure.
With reference to fig. 6, the present disclosure provides another method for controlling defrosting of an air conditioning system, the method mainly includes:
s11, when the air conditioning system runs in a heating mode, determining to trigger to enter a defrosting mode;
in the present embodiment, the execution manner of step S11 is referred to in the previous embodiments, and is not described herein again.
S12, detecting the temperature of an outer coil of the first outdoor heat exchanger;
in this embodiment, the outdoor unit of the air conditioning system is further provided with a temperature sensor at the side of the first outdoor heat exchanger, where the temperature sensor can be used to detect the real-time temperature of the coil of the first outdoor heat exchanger, and in step S12, the temperature of the external coil is obtained through the temperature sensor;
s13, determining whether T External coiled pipe ≦ T1? If so, the first step is to perform the following steps,if the frosting degree is severe frosting, executing step S14, if not, executing step S15 if the frosting degree is mild frosting;
s14, determining the flow rate of a first refrigerant to be Q1 and the flow rate of a second refrigerant to be Q2; and performs step S16;
s15, determining the flow rate of the first refrigerant to be Q3 and the flow rate of the second refrigerant to be Q4; and performing step S16;
in this embodiment, after the defrosting mode is determined to be triggered, the defrosting refrigerant flows of the first refrigerant circulation loop and the second refrigerant circulation loop in the defrosting mode are determined according to the frosting degree of the first outdoor heat exchanger, so that the heating efficiency of the first refrigerant circulation loop and the defrosting efficiency of the second refrigerant circulation loop can be matched with the frosting degree of the current first outdoor heat exchanger, and further the heating effect of the air conditioning system on the indoor environment and the defrosting effect on the first outdoor heat exchanger are ensured.
Here, the frosting degree of the first outdoor heat exchanger is determined according to the coil temperature of the outdoor heat exchanger.
Optionally, the refrigerant flow rate of the second refrigerant circulation loop is in a positive correlation with the frosting degree of the first outdoor heat exchanger, that is, the more severe the frosting of the first outdoor heat exchanger is, the more the defrosting refrigerant flow rate allocated to the second refrigerant circulation loop is, so that more heat can be used for removing the frost of the first outdoor heat exchanger.
Therefore, the refrigerant flow rates of the second refrigerant cycle determined in step S14 and step S15 according to the different frost formation degrees satisfy the relationship: q2 > Q4.
Here, for light frosting, the temperature determination range has an upper temperature threshold T2, and the outdoor unit is not easy to freeze frost when the temperature of the outdoor coil is higher than the temperature threshold T2, so the temperature of the outdoor coil with light frosting not only needs to meet the temperature requirement of being greater than T1, but also needs to be less than T2.
In this embodiment, T External coil pipe The coil temperatures of the first outdoor heat exchanger, T1 and T2 are set coil temperature thresholds.
Optionally, the value of the first refrigerant flow rate is a difference between a total refrigerant flow rate and a second refrigerant flow rate.
S16, controlling the first refrigerant circulation loop to convey the refrigerant according to the first refrigerant flow; and controlling the second refrigerant circulation loop to convey the refrigerant according to the second refrigerant flow.
In this embodiment, after the air conditioning system determines that the defrosting mode is triggered, the refrigerant flow rate shunted to the first refrigerant circulation circuit and the second refrigerant circulation circuit is determined more accurately according to the actual frosting degree of the outdoor unit of the air conditioning system, so that the heating performance and the defrosting efficiency of the air conditioning system during the defrosting mode operation can meet the actual requirement of the air conditioning system.
In some optional embodiments, the method for air conditioning system defrost control of the present application further comprises: and when determining that the defrosting mode is triggered to be exited, controlling the air conditioning system to exit the defrosting mode.
Here, the exit from the defrost mode is determined according to an operation duration of the defrost mode, and here, since the air conditioning system reduces heat absorbed from an indoor environment as much as possible when operating in the defrost mode, a large amount of refrigerant flowing back to the compressor from the second indoor heat exchanger of the second refrigerant circulation loop is in a liquid state, the liquid refrigerant is generally trapped in an air storage tank at an air return port of the compressor, which results in a reduction in an amount of refrigerant actually used for the two refrigerant circulation loops, and a long-time operation of the defrost mode results in a dual reduction in a heating performance of the first refrigerant circulation loop and a defrosting performance of the second refrigerant circulation loop, so that the operation duration of the defrost mode needs to be limited to avoid the above problems.
Optionally, the air conditioning system is further provided with a timing module, and the timing module can be used for timing after the air conditioning system enters the defrosting mode to obtain the real-time defrosting time t of the air conditioning system running in the defrosting mode Defrosting And the defrosting time period t is set Defrosting And setting a defrosting time length threshold t Threshold value Making a comparison at t Defrosting ≥t Threshold value It is determined that the exit from defrost mode is triggered.
The defrosting time length threshold t Threshold value Associated with the defrost refrigerant flow of the second refrigerant circuit, whereThe higher the set value of the defrosting refrigerant flow of the second refrigerant circulation loop is, the longer the defrosting time threshold t is Threshold value The smaller the actual defrost duration of the air conditioning system defrost mode. Here, the air conditioning system is preset with a correlation for representing the defrosting time period threshold t Threshold value And after the defrosting refrigerant flow of the second refrigerant circulation loop is determined, a defrosting duration threshold corresponding to the defrosting refrigerant flow can be obtained from the association relationship in a matching manner, and the defrosting duration threshold is used for determining and triggering the control of exiting the defrosting mode for the air-conditioning system.
Fig. 7 is a schematic diagram of an apparatus for defrosting control of an air conditioning system according to an embodiment of the present disclosure.
As shown in fig. 7, an embodiment of the present disclosure provides an apparatus for defrosting control of an air conditioning system, including:
a defrosting determination module 71 configured to determine to trigger entering a defrosting mode when the air conditioning system operates in a heating mode; the heating mode comprises that the first refrigerant circulation loop conveys refrigerants according to the flow direction of heating refrigerants, the second refrigerant circulation loop is in a conduction state, and the refrigerant flow of the first refrigerant circulation loop is larger than the refrigerant flow of the second refrigerant circulation return;
the defrosting switching module 72 is configured to control the refrigerant flow rate of the first refrigerant circulation circuit to be less than or equal to the refrigerant flow rate of the second refrigerant circulation circuit, so that the air conditioning system operates in a defrosting mode.
In some embodiments, further comprising a heating operation module configured to: controlling the first inner fan to rotate at a speed R1 Heating apparatus In operation, the second internal fan speed is at R2 Heating apparatus Operation, R1 Heating apparatus ＞R2 Heating apparatus (ii) a And/or the presence of a gas in the gas,
a defrost switching module 72 further configured to: controlling the first inner fan to rotate at a speed R1 Defrosting In operation, the second inner fan speed is at speed R2 Defrosting device Operation, R1 Defrosting ≥R2 Defrosting And R1 Defrosting ≥R1 Heating apparatus 。
In some embodiments, the heating operation module is further configured to:
acquiring the air outlet temperature of the first indoor heat exchanger side when the air conditioning system operates in a heating mode;
if the air outlet temperature is lower than the set air outlet temperature threshold, the rotating speed of the first inner fan is increased and/or the rotating speed of the second inner fan is reduced, so that the air outlet temperature reaches the set air outlet temperature threshold.
In some embodiments, the defrost switching module 72 is further configured to:
acquiring the indoor environment temperature of the air conditioning system in the defrosting mode;
if the temperature change rate of the indoor environment temperature is larger than or equal to the set temperature change rate, the rotating speed of the first inner fan is increased and/or the rotating speed of the second inner fan is reduced, so that the temperature change rate of the indoor environment temperature is smaller than the set temperature change rate.
In some embodiments, the heating operation module is further configured to:
acquiring the outdoor environment temperature of the air conditioning system in the heating mode;
and adjusting the refrigerant flow of the second refrigerant circulation loop in the heating mode according to the outdoor environment temperature.
In some embodiments, the defrost switching module 72 is further configured to:
and determining the refrigerant flow of the first refrigerant circulation loop and the refrigerant flow of the second refrigerant circulation loop in the defrosting mode according to the frosting degree of the first outdoor heat exchanger.
In some embodiments, the defrost switching module 72 is further configured to:
determining to trigger exit of defrost mode, wherein at t Defrosting ≥t Threshold value Time determination triggers exit from defrost mode, t Defrosting device For the duration of the defrost mode, t Threshold value Setting a defrosting time length threshold, wherein the defrosting time length threshold is related to the defrosting refrigerant flow of the second refrigerant circulation loop;
and controlling the air conditioning system to exit the defrosting mode.
Fig. 8 is a schematic diagram of another device for controlling defrosting of an air conditioning system according to an embodiment of the present disclosure.
As shown in fig. 8, an embodiment of the present disclosure provides an apparatus for controlling defrosting of an air conditioning system, which includes a processor (processor)100 and a memory (memory) 101. Optionally, the apparatus may also include a Communication Interface (Communication Interface)102 and a bus 103. The processor 100, the communication interface 102, and the memory 101 may communicate with each other via a bus 103. The communication interface 102 may be used for information transfer. The processor 100 may call logic instructions in the memory 101 to perform the method for air conditioning system defrost control of the above-described embodiment.
In addition, the logic instructions in the memory 101 may be implemented in the form of software functional units and stored in a computer readable storage medium when the logic instructions are sold or used as independent products.
The memory 101, which is a computer-readable storage medium, may be used for storing software programs, computer-executable programs, such as program instructions/modules corresponding to the methods in the embodiments of the present disclosure. The processor 100 executes functional applications and data processing by executing program instructions/modules stored in the memory 101, that is, implements the method for defrosting control of an air conditioning system in the above-described embodiment.
The memory 101 may include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program required for at least one function; the storage data area may store data created according to the use of the terminal device, and the like. In addition, the memory 101 may include a high-speed random access memory, and may also include a nonvolatile memory.
The embodiment of the present disclosure provides an air conditioning system, which includes the components and matching forms of the air conditioning system shown in fig. 1 to 4, and further includes a controller, wherein the controller is used for executing the method for controlling the defrosting of the air conditioning system.
Embodiments of the present disclosure provide a computer-readable storage medium having stored thereon computer-executable instructions configured to perform the above-described method for air conditioning system defrost control.
The disclosed embodiments provide a computer program product comprising a computer program stored on a computer readable storage medium, the computer program comprising program instructions that, when executed by a computer, cause the computer to perform the above-described method for air conditioning system defrost control.
The computer-readable storage medium described above may be a transitory computer-readable storage medium or a non-transitory computer-readable storage medium.
The technical solution of the embodiments of the present disclosure may be embodied in the form of a software product, where the computer software product is stored in a storage medium and includes one or more instructions to enable 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 of the embodiments of the present disclosure. And the aforementioned storage medium may be a non-transitory storage medium comprising: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes, and may also be a transient storage medium.
The above description and the drawings sufficiently illustrate embodiments of the disclosure to enable those skilled in the art to practice them. Other embodiments may incorporate structural, logical, electrical, process, and other changes. The examples merely typify possible variations. Individual components and functions are optional unless explicitly required, and the sequence of operations may vary. Portions and features of some embodiments may be included in or substituted for those of others. Furthermore, the words used in the specification are words of description only and are not intended to limit the claims. As used in the description of the embodiments and the claims, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. Similarly, the term "and/or" as used in this application is meant to encompass any and all possible combinations of one or more of the associated listed. Furthermore, the terms "comprises" and/or "comprising," when used in this application, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. Without further limitation, an element defined by the phrase "comprising an …" does not exclude the presence of other like elements in a process, method or apparatus that comprises the element. In this document, each embodiment may be described with emphasis on differences from other embodiments, and the same and similar parts between the respective embodiments may be referred to each other. For methods, products, etc. of the embodiment disclosure, reference may be made to the description of the method section for relevance if it corresponds to the method section of the embodiment disclosure.
Those of skill in the art would appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software may depend upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the disclosed embodiments. It can be clearly understood by the skilled person that, for convenience and brevity of description, the specific working processes of the system, the apparatus and the unit described above may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In the embodiments disclosed herein, the disclosed methods, products (including but not limited to devices, apparatuses, etc.) may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units may be only one type of logical functional division, and there may be other divisions in actual implementation, for example, multiple units or components may be combined or may be 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, devices or units, and may be in an electrical, mechanical or other form. The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to implement the present embodiment. In addition, functional units in the embodiments of the present disclosure may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit.
The flowchart and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of systems, methods and computer program products according to embodiments of the present disclosure. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). In some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. In the description corresponding to the flowcharts and block diagrams in the figures, operations or steps corresponding to different blocks may also occur in different orders than disclosed in the description, and sometimes there is no specific order between different operations or steps. For example, two sequential operations or steps may in fact be executed substantially concurrently, or they may sometimes be executed in the reverse order, depending upon the functionality involved. Each block of the block diagrams and/or flowchart illustrations, and combinations of blocks in the block diagrams and/or flowchart illustrations, can be implemented by special purpose hardware-based systems that perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.

Claims (10)

1. A method for defrosting control of an air conditioning system is characterized in that the air conditioning system comprises a compressor, a first circulation assembly and a second circulation assembly, wherein the first circulation assembly comprises a first indoor heat exchanger, a first outdoor heat exchanger, a first throttling device and a four-way valve, the first circulation assembly is connected with the compressor to form a first refrigerant circulation loop, the second circulation assembly comprises a second indoor heat exchanger, a second outdoor heat exchanger and a second throttling device, the second circulation assembly is connected with the compressor to form a second refrigerant circulation loop, the second indoor heat exchanger is communicated with a return air port of the compressor, the second outdoor heat exchanger is communicated with an exhaust port of the compressor, and the first outdoor heat exchanger and the second outdoor heat exchanger are arranged adjacently; the first circulation assembly further comprises a first inner fan, and the first inner fan is used for driving indoor air to exchange heat with the first indoor heat exchanger; the second circulation assembly further comprises a second inner fan, and the second inner fan is used for driving indoor air to exchange heat with the second indoor heat exchanger;
the method comprises the following steps:
when the air conditioning system runs in a heating mode, determining to trigger to enter a defrosting mode; the heating mode comprises that the first refrigerant circulation loop conveys refrigerants according to the heating refrigerant flow direction, the second refrigerant circulation loop is in a conduction state, and the refrigerant flow of the first refrigerant circulation loop is larger than that of the second refrigerant circulation loop;
controlling the refrigerant flow of the first refrigerant circulation loop to be less than or equal to the refrigerant flow of the second refrigerant circulation loop so as to enable the air-conditioning system to operate in a defrosting mode; and after the defrosting mode is triggered and determined, controlling the first inner fan to rotate at a rotating speed R1 Defrosting In operation, the second inner fan speed is at speed R2 Defrosting Operation, the R1 Defrosting ≥R2 Defrosting And said R1 Defrosting ≥R1 Heating apparatus WhereinR1 Heating apparatus The rotating speed of the first inner fan in the heating mode.
2. The method of claim 1,
the heating mode further includes: the first inner fan rotates at a rotating speed R1 Heating apparatus In operation, the second inner fan speed is at speed R2 Heating apparatus Operation, the R1 Heating apparatus ＞R2 Heating apparatus 。
3. The method of claim 2, wherein the air conditioning system operates in a heating mode, further comprising:
acquiring the air outlet temperature of the first indoor heat exchanger side when the air conditioning system operates in a heating mode;
if the air outlet temperature is smaller than the set air outlet temperature threshold value, the rotating speed of the first inner fan is increased and/or the rotating speed of the second inner fan is reduced, so that the air outlet temperature reaches the set air outlet temperature threshold value.
4. The method of claim 2, further comprising, after the determining triggers entering a defrost mode:
acquiring the indoor environment temperature of the air conditioning system in the defrosting mode;
if the temperature change rate of the indoor environment temperature is larger than or equal to the set temperature change rate, increasing the rotating speed of the first inner fan and/or reducing the rotating speed of the second inner fan so as to enable the temperature change rate of the indoor environment temperature to be smaller than the set temperature change rate.
5. The method of claim 1, wherein the air conditioning system operates in a heating mode, further comprising:
acquiring the outdoor environment temperature of the air conditioning system in a heating mode;
and adjusting the refrigerant flow of the second refrigerant circulation loop in the heating mode according to the outdoor environment temperature.
6. The method of claim 1, further comprising, after the determining triggers entering a defrost mode:
and determining the refrigerant flow of the first refrigerant circulation loop and the refrigerant flow of the second refrigerant circulation loop in a defrosting mode according to the frosting degree of the first outdoor heat exchanger.
7. The method of any of claims 1 to 6, further comprising:
determining to trigger exit of defrost mode, wherein at t Defrosting device ≥t Threshold value Time determination triggers exit from defrost mode, t Defrosting For the operating duration of the defrost mode, t Threshold value Setting a defrosting time length threshold, wherein the defrosting time length threshold is related to the defrosting refrigerant flow of the second refrigerant circulation loop;
and controlling the air conditioning system to exit the defrosting mode.
8. An air conditioning system is characterized by comprising a compressor, a first circulation assembly and a second circulation assembly, wherein the first circulation assembly comprises a first indoor heat exchanger, a first outdoor heat exchanger, a first throttling device and a four-way valve, the first circulation assembly is connected with the compressor to form a first refrigerant circulation loop, the second circulation assembly comprises a second indoor heat exchanger, a second outdoor heat exchanger and a second throttling device, the second circulation assembly is connected with the compressor to form a second refrigerant circulation loop, the second indoor heat exchanger is communicated with a gas return port of the compressor, the second outdoor heat exchanger is communicated with a gas exhaust port of the compressor, and the first outdoor heat exchanger and the second outdoor heat exchanger are arranged adjacently; the first circulating assembly further comprises a first inner fan, and the first inner fan is used for driving indoor air to exchange heat with the first indoor heat exchanger; the second circulation assembly further comprises a second inner fan, and the second inner fan is used for driving indoor air to exchange heat with the second indoor heat exchanger;
the air conditioning system further includes a controller for: when the air conditioning system runs in a heating mode, determining to trigger to enter a defrosting mode; the heating mode comprises that the first refrigerant circulation loop conveys refrigerants according to the flow direction of heating refrigerants, the second refrigerant circulation loop is in a conduction state, and the refrigerant flow of the first refrigerant circulation loop is larger than that of the second refrigerant circulation loop; controlling the refrigerant flow of the first refrigerant circulation loop to be less than or equal to the refrigerant flow of the second refrigerant circulation loop so as to enable the air-conditioning system to operate in a defrosting mode; and after the defrosting mode is triggered and determined, controlling the first inner fan to rotate at a rotating speed R1 Defrosting device In operation, the second inner fan speed is at speed R2 Defrosting Operation, the R1 Defrosting ≥R2 Defrosting And said R1 Defrosting ≥R1 Heating apparatus Wherein R1 Heating apparatus The rotating speed of the first inner fan in the heating mode.
9. A device for controlling defrosting of an air conditioning system is characterized in that the air conditioning system comprises a compressor, a first circulation assembly and a second circulation assembly, wherein the first circulation assembly comprises a first indoor heat exchanger, a first outdoor heat exchanger, a first throttling device and a four-way valve; the first circulating assembly further comprises a first inner fan, and the first inner fan is used for driving indoor air to exchange heat with the first indoor heat exchanger; the second circulation assembly further comprises a second inner fan, and the second inner fan is used for driving indoor air to exchange heat with the second indoor heat exchanger;
the device comprises:
a defrosting determination module configured to determine to trigger entering of a defrosting mode when the air conditioning system operates a heating mode; the heating mode comprises that the first refrigerant circulation loop conveys refrigerants according to the heating refrigerant flow direction, the second refrigerant circulation loop is in a conduction state, and the refrigerant flow of the first refrigerant circulation loop is larger than that of the second refrigerant circulation loop;
the defrosting switching module is configured to control the refrigerant flow of the first refrigerant circulation loop to be less than or equal to the refrigerant flow of the second refrigerant circulation loop so as to enable the air-conditioning system to operate in a defrosting mode; and after the defrosting mode is triggered and determined, controlling the first inner fan to rotate at a rotating speed R1 Defrosting In operation, the second inner fan speed is at speed R2 Defrosting Operation, the R1 Defrosting ≥R2 Defrosting device And said R1 Defrosting ≥R1 Heating apparatus Wherein R1 Heating apparatus The rotating speed of the first inner fan in the heating mode.
10. An apparatus for air conditioning system defrost control comprising a processor and a memory storing program instructions, characterized in that the processor is configured to perform the method for air conditioning system defrost control as claimed in any of claims 1 to 7 when executing the program instructions.
CN202110130362.2A 2021-01-29 2021-01-29 Method and device for defrosting control of air conditioning system and air conditioning system Active CN112880131B (en)

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