CN113124513B - Air conditioning system and control method thereof - Google Patents

Air conditioning system and control method thereof Download PDF

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Publication number
CN113124513B
CN113124513B CN202110492003.1A CN202110492003A CN113124513B CN 113124513 B CN113124513 B CN 113124513B CN 202110492003 A CN202110492003 A CN 202110492003A CN 113124513 B CN113124513 B CN 113124513B
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Prior art keywords
defrosting
heat exchange
conditioning system
air conditioning
exchange section
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CN202110492003.1A
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CN113124513A (en
Inventor
张仕强
陈敏
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Gree Electric Appliances Inc of Zhuhai
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Gree Electric Appliances Inc of Zhuhai
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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
    • F24F5/00—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
    • F24F11/41—Defrosting; Preventing freezing
    • F24F11/42—Defrosting; Preventing freezing of outdoor units
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
    • F24F11/63—Electronic processing
    • F24F11/64—Electronic processing using pre-stored data
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
    • F24F11/63—Electronic processing
    • F24F11/65—Electronic processing for selecting an operating mode
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/70—Control systems characterised by their outputs; Constructional details thereof
    • F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
    • F24F11/83—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers
    • F24F11/84—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers using valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/70—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
    • F24F11/873—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling refrigerant heaters
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/88—Electrical aspects, e.g. circuits

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Fuzzy Systems (AREA)
  • Mathematical Physics (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Air Conditioning Control Device (AREA)

Abstract

The invention provides an air conditioning system and a control method thereof, wherein the air conditioning system comprises an outdoor heat exchanger, the outdoor heat exchanger comprises at least two heat exchange sections, and at least one heat exchange section has a heat exchange state directly or indirectly communicated with an indoor heat exchanger and a defrosting state directly or indirectly communicated with the indoor heat exchanger and an exhaust port of a compressor at the same time. According to the air conditioning system and the control method thereof provided by the invention, the outdoor heat exchanger is divided into the plurality of heat exchange sections to realize the partition defrosting, and a smaller amount of heat is concentrated into one heat exchange section to defrost, so that the defrosting time is shortened, the energy loss for heating is small, the heat utilization rate is high, and the defrosting is more timely. The heating quantity of the whole heating period is also improved, and the comfort of the user is better optimized.

Description

Air conditioning system and control method thereof
Technical Field
The invention relates to the technical field of air treatment equipment, in particular to an air conditioning system and a control method thereof.
Background
At present, continuous heating of air conditioners is always a research trend, and air conditioning systems are also continuously optimized by various large manufacturers to achieve the effect of continuous heating. Most of the heat storage modules are utilized to store heat in the condenser first and then release heat in the evaporator when defrosting. However, the method needs more new devices and more pipelines, and has higher cost; and the heat storage module provides limited energy, the defrosting effect can be influenced, and even if continuous heating is realized, the indoor comfort is greatly reduced.
Disclosure of Invention
In order to solve the technical problem that the comfort of an air conditioning system in the prior art is reduced in the defrosting process, the air conditioning system and the control method thereof are provided, wherein the outdoor heat exchanger is arranged in sections and independently controls defrosting.
An air conditioning system comprises a refrigerant cycle with an outdoor heat exchanger, an indoor heat exchanger and a compressor, wherein the outdoor heat exchanger comprises at least two heat exchange sections, and at least one heat exchange section has a defrosting state and a heat exchange state;
when the heat exchange section is in a heat exchange state, a first communication end of the heat exchange section is communicated with the indoor heat exchanger;
when the heat exchange section is in a defrosting state, the first communication end of the heat exchange section is communicated with the indoor heat exchanger, and meanwhile, the first communication end of the heat exchange section is communicated with an exhaust port of the compressor.
The air conditioning system comprises a defrosting pipeline, wherein the first end of the defrosting pipeline is directly or indirectly communicated with the exhaust port of the compressor, and the heat exchange section is directly or indirectly communicated with the second end of the defrosting pipeline.
The air conditioning system further comprises a defrosting branch, and the heat exchange section is communicated with the second end of the defrosting pipeline through the corresponding defrosting branch.
The defrosting branches correspond to the heat exchange sections one by one.
The defrosting branch is provided with an on-off mechanism, when the heat exchange section is in the heat exchange state, the on-off mechanism on the corresponding defrosting branch is in an off state, and when the heat exchange section is in the defrosting state, the on-off mechanism on the corresponding defrosting branch is in an on state.
The air conditioning system further comprises a three-way pipe, a first communicating port of the three-way pipe is communicated with the corresponding heat exchange section, a second communicating port of the three-way pipe is communicated with the indoor heat exchanger, and a third communicating port of the three-way pipe is communicated with an exhaust port of the compressor.
The three-way pipe corresponds to the heat exchange sections with defrosting states one by one.
The outdoor heat exchanger comprises a plurality of heat exchange tubes, and each heat exchange section comprises at least one heat exchange tube.
The control method of the air conditioning system comprises the steps of
S1, judging whether the air conditioning system needs defrosting;
and S2, if yes, switching at least one heat exchange section to a defrosting state.
In step S2, the method further includes:
determining a heat exchange section needing defrosting;
and the heat exchange sections which need defrosting are switched to a defrosting state in turn.
The method also comprises the following steps of:
acquiring a refrigerant temperature change value of at least one heat exchange section, and determining that the corresponding heat exchange section needs defrosting if the refrigerant temperature change value is smaller than a first preset temperature difference value;
and/or acquiring a refrigerant pressure change value of at least one heat exchange section, and determining that the corresponding heat exchange section needs defrosting if the refrigerant pressure change value is smaller than the first pressure difference value.
Step S1 further includes:
acquiring a refrigerant temperature change value of at least one heat exchange section, and determining that the air conditioning system needs defrosting if the refrigerant temperature change value is smaller than a first preset temperature difference value;
and/or obtaining a refrigerant pressure change value of at least one heat exchange section, and determining that the air conditioning system needs defrosting.
After step S2, the method further includes:
judging whether the air conditioning system stops defrosting or not;
if yes, all the heat exchange sections are switched to a heat exchange state.
The method also comprises the following steps of judging whether the air conditioning system stops defrosting:
obtaining a refrigerant temperature change value of at least one heat exchange section, and determining that the air conditioning system stops defrosting if the refrigerant temperature change value is greater than or equal to a first preset temperature difference value;
and/or obtaining a refrigerant pressure change value of at least one heat exchange section, and determining that the air conditioning system stops defrosting if the refrigerant pressure change value is greater than or equal to a first pressure difference value;
and/or acquiring defrosting time for switching the heat exchange section to the defrosting state, and when the defrosting time is equal to the first time value, switching the corresponding heat exchange section to the heat exchange state.
Step S1 further includes:
acquiring an actual attenuation rate A of the heating capacity of the air conditioning system, and comparing the actual attenuation rate A of the heating capacity with a first preset heating capacity attenuation rate S;
and if A is larger than or equal to S, determining that the air conditioning system needs defrosting.
Step S2 further includes:
acquiring an actual attenuation rate A of the heating capacity of the air conditioning system, and comparing the actual attenuation rate A of the heating capacity with a second attenuation rate T of the heating capacity;
and if A is less than or equal to T, determining that the air conditioning system stops defrosting.
The calculation formula of the actual attenuation rate A of the heating capacity is as follows:
heating capacity attenuation rate (heating capacity)Is effective-heat generation capacityn) Heating capacityIs effective；
Wherein: heating capacitynThe real-time heating capacity of the air conditioning system is obtained;
heating capacityIs effectiveThe method is used for generating heat in the operation stage before defrosting of the air conditioning system.
All the heat exchange sections have a heat exchange state and a defrosting state, the air conditioning system has a reverse defrosting mode, and in the reverse defrosting mode, all the heat exchange sections are switched to the heat exchange state;
in step S2, the method further includes:
and if all the heat exchange sections need defrosting, the air conditioning system is switched to a reverse defrosting mode.
The air conditioning system includes a defrosting pipeline, a first end of the defrosting pipeline is directly or indirectly communicated with an exhaust port of the compressor, a heat exchange section with a defrosting state is directly or indirectly communicated with a second end of the defrosting pipeline, the air conditioning system further includes a defrosting branch, the defrosting branch corresponds to the heat exchange section with a defrosting state one by one, the heat exchange section is communicated with the second end of the defrosting pipeline through the corresponding defrosting branch, an on-off mechanism is arranged on the defrosting branch, when the heat exchange section is in the heat exchange state, the on-off mechanism on the defrosting branch is in an off state, when the heat exchange section is in the defrosting state, the on-off mechanism on the defrosting branch is in an on state, and when the heat exchange section is in the defrosting state, the on-off mechanism on the defrosting branch is in an on state, the step S2 further includes:
and the on-off mechanism on the defrosting branch corresponding to the heat exchange section switched to the defrosting state is switched to the on-off state, and the on-off mechanism on the defrosting branch corresponding to the heat exchange section switched to the heat exchange state is switched to the off state.
The air conditioning system includes an outdoor fan, and further includes, after step S1:
the rotation speed of the outdoor fan is increased.
The air conditioning system includes a compressor, and after the step S1, further includes:
the energy efficiency output of the compressor is increased.
According to the air conditioning system and the control method thereof provided by the invention, the outdoor heat exchanger is divided into the plurality of heat exchange sections to realize the partition defrosting, and a smaller amount of heat is concentrated into one heat exchange section to defrost, so that the defrosting time is shortened, the energy loss for heating is small, the heat utilization rate is high, and the defrosting is more timely. The heating quantity of the whole heating period is also improved, and the comfort of the user is better optimized.
Drawings
Fig. 1 is a schematic structural diagram of an air conditioning system according to an embodiment of an air conditioning system and a control method thereof provided by the present invention;
fig. 2 is a control flowchart of an air conditioning system according to an embodiment of the air conditioning system and a control method thereof provided by the present invention;
fig. 3 is another control flowchart of the air conditioning system according to the embodiment of the air conditioning system and the control method thereof provided by the present invention;
fig. 4 is another control flowchart of the air conditioning system according to the embodiment of the air conditioning system and the control method thereof provided by the present invention;
in the figure:
1. an outdoor heat exchanger; 11. a heat exchange section; 2. an indoor heat exchanger; 3. a compressor; 4. a defrosting pipeline; 5. a defrosting branch; 6. an on-off mechanism; 7. a three-way pipe.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The air conditioning system shown in fig. 1 to 4 includes a refrigerant cycle having an outdoor heat exchanger 1, an indoor heat exchanger 2, and a compressor 3, and is characterized in that: the outdoor heat exchanger 1 comprises at least two heat exchange sections 11, and at least one heat exchange section 11 has a defrosting state and a heat exchange state; when the heat exchange section is in a heat exchange state, the first communication end of the heat exchange section 11 is communicated with the indoor heat exchanger 2; when the heat exchange section 1111 is in a defrosting state, the first communication end of the heat exchange section is communicated with the indoor heat exchanger 2, and the first communication end of the heat exchange section 11 is communicated with the exhaust port of the compressor, when it is determined that the air conditioning system needs defrosting, the air conditioning system keeps a heating mode, the exhaust gas of the compressor 3 sequentially passes through the indoor heat exchanger 2, the outdoor heat exchanger 1 and the four-way valve and then flows back to the compressor 3 to complete a heating cycle, and meanwhile, the corresponding heat exchange section 11 is switched to the defrosting state, part of the exhaust gas of the compressor 3 is directly introduced into the heat exchange section 11 and is mixed with the refrigerant flowing into the heat exchange section 11 through the indoor heat exchanger 2 to defrost the heat exchange section 11 or the whole outdoor heat exchanger 1, so that normal indoor heating is ensured, and defrosting of the outdoor heat exchanger 1 is completed at the same time, wherein the heat exchange section 11 is in a heat exchange state when the air conditioning system is in a heating mode or a cooling mode, only when heat transfer section 11 need change the frost or when outdoor heat exchanger 1 need change the frost, this heat transfer section 11 just switches to changing the frost state, and when changing the frost, heat transfer section 11 also can freely switch between heat transfer state and change the frost state as required moreover, and the arrow direction in figure 1 is for having the refrigerant flow direction when heat transfer section is in changes the frost state, wherein all the heat transfer section can be parallel connection, perhaps the heat transfer section is series connection, and parallel connection and series connection all can realize the effect that the independent frost of heat transfer section changes.
Wherein can confirm heat transfer section 11 according to heat transfer section 11's position and structure and only can change the frost to self or can change the frost to a plurality of heat transfer sections 11 or even outdoor heat exchanger 1, if heat transfer section 11 is in outdoor heat exchanger 1's below, the steam that its produced rises and to heat whole outdoor heat exchanger 1, if again set up heat transfer section 11 at outdoor heat exchanger 1's different heights, utilize heat transfer section 11's heat all to heat the regional defrosting around heat transfer section 11.
The air conditioning system comprises a defrosting pipeline 4, wherein a first end of the defrosting pipeline 4 is directly or indirectly communicated with an exhaust port of the compressor 3, the heat exchange section 11 with the defrosting state is directly or indirectly communicated with a second end of the defrosting pipeline 4, and the defrosting pipeline 4 can introduce exhaust gas of the compressor 3 into the corresponding heat exchange section 11 for defrosting.
The air conditioning system further comprises a defrosting branch 5, the heat exchange section 11 in the defrosting state is communicated with the second end of the defrosting pipeline 4 through the corresponding defrosting branch 5, the defrosting pipeline 4 is divided by the defrosting branch 5, so that the defrosting pipeline 4 is communicated with the heat exchange sections 11 conveniently, the heat exchange sections 11 can be communicated with the defrosting branch 5, and the heat exchange sections 11 are synchronously controlled.
The defrosting branches 5 correspond to the heat exchange sections 11 with the defrosting states one by one, so that each heat exchange section 11 can be independently controlled.
The defrosting branch 5 is provided with an on-off mechanism 6, when the heat exchange section 11 is in the heat exchange state, the on-off mechanism 6 on the corresponding defrosting branch 5 is in an off state, and when the heat exchange section 11 is in the defrosting state, the on-off mechanism 6 on the corresponding defrosting branch 5 is in a connected state, that is, the on-off mechanism 6 is used to control whether the corresponding heat exchange section 11 is switched to the defrosting state, preferably, the on-off mechanism 6 is an electromagnetic valve with an adjustable opening degree.
The air conditioning system further comprises a three-way pipe 7, a first communicating port of the three-way pipe 7 is communicated with the corresponding heat exchange section 11, a second communicating port of the three-way pipe 7 is communicated with the indoor heat exchanger 2, a third communicating port of the three-way pipe 7 is communicated with an exhaust port of the compressor 3, the structure of the outdoor heat exchanger 1 or the structure of the heat exchange section 11 is prevented from being changed through the structure of the three-way pipe 7, and only the three-way pipe 7 is required to be arranged at the communicating port of the heat exchange section 11.
The three-way pipe 7 corresponds to the heat exchange sections 11 with defrosting states one by one, so that each heat exchange section 11 can be independently communicated with an exhaust port of the compressor 3 directly or indirectly, and the heat exchange sections 11 are independently controlled.
According to the number of the heat exchange sections, the corresponding number of defrosting branches 5 is set, each defrosting branch 5 is divided through a liquid dividing head, and a refrigerant returned by the indoor heat exchanger is converged and flows into the corresponding heat exchange section through a three-way pipe 7, and when the size of a liquid dividing head interface is usually smaller than that of a heat exchanger interface, a capillary tube is needed to be excessive between the liquid dividing head and a corresponding communicating port of the three-way pipe.
Outdoor heat exchanger 1 includes many heat exchange tubes, each heat transfer section 11 includes at least one the heat exchange tube, wherein the quantity of heat exchange tube can be confirmed according to actual need in the heat transfer section 11, if can be more serious because of outdoor heat exchanger 1's below frost degree, the quantity of heat exchange tube is more in the heat transfer section 11 that is arranged in outdoor heat exchanger 1 below, and the quantity of heat exchange tube is less in the heat transfer section 11 that is arranged in outdoor heat exchanger 1 top to guarantee that the effect of indoor heating can not be influenced basically in the defrosting process.
The air conditioning system has a circulation defrosting mode:
in the circulation defrosting mode, in the heat exchange sections 11 that need to be defrosted, the heat exchange sections 11 are alternately switched to the defrosting state, and finally all the heat exchange sections 11 can stop defrosting, wherein in the alternate switching process, one heat exchange section 11 can be switched to the defrosting state, or two or more heat exchange sections 11 can be simultaneously switched to the defrosting state on the premise of influencing the indoor heating effect.
At least two heat exchange sections 11 are switched to the defrosting state at the same time, and defrosting time is shortened.
The air conditioning system comprises an outdoor fan, and when the air conditioning system is switched to the circulating defrosting mode, the rotating speed of the outdoor fan is increased, so that the gas flowing speed at the outdoor heat exchanger 1 is increased, and the defrosting efficiency is increased.
The air conditioning system comprises a compressor 3, and when the air conditioning system is switched to the circulating defrosting mode, the energy efficiency output of the compressor 3 is increased, so that the indoor heating efficiency is met, and meanwhile, the defrosting requirement is met.
All the heat exchange sections 11 have a heat exchange state and a defrosting state, that is, all parts of the outdoor heat exchanger 1 can be switched to the defrosting state to defrost.
The air conditioning system has a reverse defrost mode: when all the heat exchange sections 11 need defrosting, the air conditioning system is switched to a reverse defrosting mode;
in the reverse defrosting mode, all the heat exchange sections 11 are switched to the heat exchange state, at this time, the four-way valve in the air conditioning system is reversed, and the exhaust gas of the compressor 3 enters the outdoor heat exchanger 1 to defrost the outdoor heat exchanger 1.
The air conditioning system has a heating mode:
in the heating mode, all the heat exchange sections 11 are switched to a heat exchange state, and at the moment, exhaust gas of the compressor 3 sequentially enters the indoor heat exchanger 2, the outdoor heat exchanger 1 and the four-way valve and then flows back to the compressor 3 to complete a heating cycle.
Air conditioning system still includes indoor mechanism and electric heating part, the electric heating part set up in indoor mechanism department, and when the air-out temperature of indoor mechanism is less than the confined temperature, the electric heating part switches to the open mode, utilizes the electric heating part to assist the heat to indoor providing, guarantees indoor comfort level.
As shown in fig. 2 to 4, the control method of the air conditioning system includes:
s1, judging whether the air conditioning system needs defrosting, preferably, when one heat exchange section needs defrosting, determining that the air conditioning system needs defrosting;
s2, if yes, switching the at least one heat exchange segment 11 to a defrosting state, where the heat exchange segment 11 switched to the defrosting state may be a heat exchange segment that needs defrosting, or a heat exchange segment that can defrost the heat exchange segment 11 that needs defrosting (for example, the heat exchange segment 11 located below can provide heat to the heat exchange segment 11 above and defrost the heat exchange segment 11 above), and is specifically determined according to preset conditions and actual needs.
In step S2, the method further includes:
determining a heat exchange section 11 needing defrosting;
in order to ensure the heating reliability of the air conditioning system and avoid that too many heat exchange sections 11 are simultaneously switched to a defrosting state, the heat exchange sections 11 which need defrosting are alternately switched to the defrosting state, and at least the heat exchange sections 11 which can ensure the heating reliability of the air conditioning system and do not carry out defrosting exist, namely the air conditioning system is switched to a circulating defrosting mode.
Particularly, when the alternate switching is performed, the determination can be performed according to a preset alternate sequence, and the preferential defrosting of the heat exchange section 11 with a heavier frosting degree can also be performed, specifically, the determination is performed according to actual needs.
In the state that the heat exchange sections 11 which need defrosting are switched to a defrosting state in turn, the method further comprises the following steps:
when at least one heat exchange section 11 switched to the defrosting state stops defrosting, at least one heat exchange section 11 needing defrosting is switched to the defrosting state.
Taking the outdoor heat exchanger divided into three heat exchange sections (A, B, C) as an example: possible defrosting situations may be:
the conditions that can occur when the single heat exchange sections 11 defrost one by one in a circulation mode include: (A → B → C → A), (A → C → B → A), (B → A → C → B), (B → C → A → B), (C → B → A → C), (C → A → B → C);
② the possible conditions of one cycle of defrosting by a plurality of heat exchange sections 11 include: (A + B → C → A/A + B/B), (A + C → B → A/A + C/C), (C + B → A → C/C + B/B), (A → C + B → A), (B → C + A → B), (C → A + B → C), and the like.
As an embodiment, the method further includes, in the heat exchange section 11 for determining that defrosting is required:
obtaining a refrigerant temperature change value of at least one heat exchange section, and if the refrigerant temperature change value is smaller than a first preset temperature difference value, determining that the corresponding heat exchange section needs defrosting, namely, judging whether the heat exchange section 11 needs defrosting (temperature change) according to the temperature change degree of the refrigerant in the heat exchange section 11;
and/or, obtaining a refrigerant pressure change value of at least one heat exchange section, if the refrigerant pressure change value is smaller than the first pressure difference value, determining that the corresponding heat exchange section needs defrosting, that is, determining whether the heat exchange section 11 needs defrosting (pressure change) according to the degree of pressure change of the refrigerant in the heat exchange section 11;
in the heat exchange section 11 which is determined to be defrosted, independent judgment can be performed according to the temperature change or the pressure change, or both the temperature change and the pressure change can be judged, and the condition which is preferentially achieved is selected for determination, or the judgment is performed by using the temperature change as the first priority, or the judgment is performed by using the pressure change as the first priority.
As an embodiment, step S1 further includes:
acquiring a refrigerant temperature change value of at least one heat exchange section, and if the refrigerant temperature change value is smaller than a first preset temperature difference value, determining that the air-conditioning system needs defrosting, namely judging whether the air-conditioning system needs defrosting (temperature change) according to the temperature change degree of the refrigerant in the heat exchange section 11;
and/or, obtaining a refrigerant pressure change value of at least one heat exchange section, determining that the air conditioning system needs defrosting, namely, judging whether the heat exchange section 11 needs defrosting (pressure change) according to the degree of pressure change of the refrigerant in the heat exchange section 11;
in the process of judging whether the air conditioning system needs defrosting, independent judgment can be carried out according to the temperature change or the pressure change, or both the temperature change and the pressure change can be judged, and the condition which is achieved preferentially is selected for determination, or the judgment is carried out by taking the temperature change as the first priority, or the judgment is carried out by taking the pressure change as the first priority.
Step S2 further includes:
judging whether the air conditioning system stops defrosting or not;
if yes, it is indicated that all the heat exchange sections 11 in the air conditioning system do not need defrosting at this time, all the heat exchange sections are switched to a heat exchange state, and the air conditioning system continues to maintain a heating mode or works according to other working modes set by a user.
After judging whether the air conditioning system stops defrosting, the method further comprises the following steps:
if not, repeating the step S1, implementing real-time detection on whether the air conditioning system needs defrosting as an embodiment, and determining whether the air conditioning system stops defrosting further includes:
obtaining a refrigerant temperature change value of at least one heat exchange section, and if the refrigerant temperature change value is greater than or equal to a first preset temperature difference value, determining that the air-conditioning system stops defrosting, namely judging whether the air-conditioning system stops defrosting (temperature change) according to the temperature change degree of the refrigerant in the heat exchange section 11;
and/or, obtaining a refrigerant pressure change value of at least one heat exchange section, and if the refrigerant pressure change value is greater than or equal to the first pressure difference value, determining that the defrosting of the air-conditioning system is stopped, namely judging whether the defrosting of the air-conditioning system is stopped (pressure change) according to the pressure change degree of the refrigerant in the heat exchange section 11;
and/or acquiring defrosting time for switching the heat exchange section to the defrosting state, and when the defrosting time is equal to a first time value, switching the corresponding heat exchange section to the heat exchange state, namely judging whether the air conditioning system stops defrosting (time change) according to a preset time value.
In judging whether the air conditioning system stops defrosting, the air conditioning system can be independently judged according to the temperature change, the pressure change or the time change, or the three conditions of the temperature change, the pressure change and the time change can be randomly combined and judged, and the condition which is preferentially reached is selected for determination, such as the simultaneous judgment of the temperature change and the time change or the temperature change and the pressure change or the pressure change and the time change; determining to judge by using temperature change as a first priority or determining to judge by using pressure change as a first priority; or determining to judge with time change as the first priority.
Step S1 further includes:
setting a first heating quantity attenuation rate S;
acquiring an actual attenuation rate A of the heating capacity of the air conditioning system, and comparing the A with the S;
and if A is larger than or equal to S, the problem that the outdoor heat exchanger is frosted inevitably because the heating capacity of the air-conditioning system is too low at the moment is shown, and the fact that the air-conditioning system needs to be defrosted is determined.
Step S2 further includes:
setting a second heating quantity attenuation rate T;
acquiring an actual attenuation rate A of the heating capacity of the air conditioning system, and comparing the A with the T;
if A is less than or equal to T, the heating capacity of the air-conditioning system at the moment is shown to reach or exceed the requirement for meeting indoor heating, and the defrosting of the air-conditioning system is determined to be stopped even if the frosting phenomenon exists on the outdoor heat exchanger and the indoor heating efficiency is not influenced.
The calculation formula of the actual attenuation rate A of the heating capacity is as follows:
attenuation rate of heating capacity (heating capacity)Is effective-heat generation capacityn) Effective heating capacity;
wherein: heating capacitynThe real-time heating capacity of the air conditioning system is obtained;
heating capacityIs effectiveThe heating capacity (the heating capacity which meets the indoor comfort level or can reach the user set condition) in the operation stage before defrosting is carried out on the air conditioning system.
All the heat exchange sections 11 have a heat exchange state and a defrosting state, the air conditioning system has a reverse defrosting mode, and in the reverse defrosting mode, all the heat exchange sections 11 are switched to the heat exchange state;
in step S2, the method further includes:
if all the heat exchange sections 11 need to be defrosted, which indicates that the air conditioning system at this time cannot meet normal heating operation, the air conditioning system is switched to a reverse defrosting mode, wherein the refrigerant flow direction in the reverse defrosting mode is basically the same as the refrigerant flow direction in the refrigeration mode, and the outdoor heat exchanger is heated by using the exhaust gas of the compressor to defrost.
The air conditioning system comprises a defrosting pipeline 4, a first end of the defrosting pipeline 4 is directly or indirectly communicated with an exhaust port of the compressor 3, the heat exchange section 11 with the defrosting state is directly or indirectly communicated with a second end of the defrosting pipeline 4, the air conditioning system further comprises a defrosting branch 5, the defrosting branch 5 is in one-to-one correspondence with the heat exchange section 11 with the defrosting state, the heat exchange section 11 is communicated with the second end of the defrosting pipeline 4 through the corresponding defrosting branch 5, an on-off mechanism 6 is arranged on the defrosting branch 5, when the heat exchange section 11 is in the heat exchange state, the corresponding on-off mechanism 6 on the defrosting branch 5 is in an off state, when the heat exchange section 11 is in the defrosting state, the corresponding on-off mechanism 6 on the defrosting branch 5 is in an on state, step S2 further includes:
the on-off mechanism 6 on the defrosting branch 5 corresponding to the heat exchange section 11 switched to the defrosting state is switched to the on-off state, and the on-off mechanism 6 on the defrosting branch 5 corresponding to the heat exchange section 11 switched to the heat exchange state is switched to the off state.
The air conditioning system includes an outdoor fan, and after step S1, further includes:
the rotating speed of the outdoor fan is increased, the amount of gas passing through the outdoor heat exchanger is increased, and defrosting efficiency is improved.
The air conditioning system includes a compressor 3, and after step S1, further includes:
the energy efficiency output of the compressor 3 is increased, the indoor heating requirement is met, and the defrosting requirement of the heat exchange section 11 is met.
The air conditioning system further includes an indoor mechanism and an electric heating part provided at the indoor mechanism, further including after step S1:
judging whether the air outlet temperature of the indoor mechanism is lower than a limited temperature or not;
if, then open electric heating part, utilize electric heating part to assist indoor heating, promote user experience.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims (21)

1. An air conditioning system comprises a refrigerant cycle having an outdoor heat exchanger (1), an indoor heat exchanger (2), and a compressor (3), and is characterized in that: the outdoor heat exchanger (1) comprises at least two heat exchange sections (11), and at least one heat exchange section (11) has a defrosting state and a heat exchange state;
when the heat exchange section (11) is in a heat exchange state, a first communication end of the heat exchange section (11) is communicated with the indoor heat exchanger (2);
when the heat exchange section (11) is in a defrosting state, the first communication end of the heat exchange section (11) is communicated with the indoor heat exchanger (2), and meanwhile, the first communication end of the heat exchange section (11) is communicated with an exhaust port of the compressor.
2. The air conditioning system of claim 1, wherein: the air conditioning system comprises a defrosting pipeline (4), wherein a first end of the defrosting pipeline (4) is communicated with an exhaust port of the compressor (3), and a second end of the defrosting pipeline (4) is communicated with a first communicating end of the heat exchange section (11).
3. The air conditioning system of claim 2, wherein: the air conditioning system further comprises a defrosting branch (5), and the heat exchange section (11) is communicated with the second end of the defrosting pipeline (4) through the corresponding defrosting branch (5).
4. The air conditioning system of claim 3, wherein: the defrosting branches (5) correspond to the heat exchange sections (11) one by one.
5. The air conditioning system according to claim 3 or 4, characterized in that: the defrosting device is characterized in that the defrosting branch (5) is provided with an on-off mechanism (6), when the heat exchange section (11) is in the heat exchange state, the on-off mechanism (6) on the corresponding defrosting branch (5) is in an off state, and when the heat exchange section (11) is in the defrosting state, the on-off mechanism (6) on the corresponding defrosting branch (5) is in a connected state.
6. The air conditioning system of claim 1, wherein: the air conditioning system further comprises a three-way pipe (7), a first communicating port of the three-way pipe (7) is communicated with the corresponding heat exchange section (11), a second communicating port of the three-way pipe (7) is communicated with the indoor heat exchanger (2), and a third communicating port of the three-way pipe (7) is communicated with an exhaust port of the compressor (3).
7. The air conditioning system of claim 6, wherein: the three-way pipes (7) correspond to the heat exchange sections (11) with defrosting states one by one.
8. The air conditioning system of claim 1, wherein: the outdoor heat exchanger (1) comprises a plurality of heat exchange tubes, and each heat exchange section (11) comprises at least one heat exchange tube.
9. A control method of an air conditioning system according to any one of claims 1 to 8, characterized in that: comprises that
S1, judging whether the air conditioning system needs defrosting;
s2, if yes, at least one heat exchange section (11) is switched to a defrosting state.
10. The control method according to claim 9, characterized in that: in step S2, the method further includes:
determining a heat exchange section (11) needing defrosting;
the heat exchange sections (11) which need defrosting are switched to a defrosting state in turn.
11. The control method according to claim 10, characterized in that: the method also comprises the following steps in the heat exchange section (11) which is determined to need defrosting:
obtaining a refrigerant temperature change value of at least one heat exchange section (11), and if the refrigerant temperature change value is smaller than a first preset temperature difference value, determining that the corresponding heat exchange section (11) needs defrosting;
and/or obtaining a refrigerant pressure change value of at least one heat exchange section (11), and if the refrigerant pressure change value is smaller than the first pressure difference value, determining that the corresponding heat exchange section (11) needs defrosting.
12. The control method according to claim 9, characterized in that: step S1 further includes:
acquiring a refrigerant temperature change value of at least one heat exchange section (11), and determining that the air conditioning system needs defrosting if the refrigerant temperature change value is smaller than a first preset temperature difference value;
and/or obtaining a refrigerant pressure change value of at least one heat exchange section (11), and determining that the air conditioning system needs defrosting.
13. The control method according to claim 9, characterized in that: after step S2, the method further includes:
judging whether the air conditioning system stops defrosting or not;
if yes, all the heat exchange sections are switched to a heat exchange state.
14. The control method according to claim 13, characterized in that: the method also comprises the following steps of judging whether the air conditioning system stops defrosting:
obtaining a refrigerant temperature change value of at least one heat exchange section (11), and determining that the air conditioning system stops defrosting if the refrigerant temperature change value is greater than or equal to a first preset temperature difference value;
and/or obtaining a refrigerant pressure change value of at least one heat exchange section (11), and if the refrigerant pressure change value is larger than or equal to a first pressure difference value, determining that the air-conditioning system stops defrosting;
and/or acquiring defrosting time for switching the heat exchange section (11) to the defrosting state, and when the defrosting time is equal to the first time value, switching the corresponding heat exchange section (11) to the heat exchange state.
15. The control method according to claim 9, characterized in that: step S1 further includes:
acquiring an actual attenuation rate A of the heating capacity of the air conditioning system, and comparing the attenuation rate A with a first preset heating capacity attenuation rate S;
and if A is larger than or equal to S, determining that the air conditioning system needs defrosting.
16. The control method according to claim 9, characterized in that: step S2 further includes:
acquiring an actual attenuation rate A of the heating capacity of the air conditioning system, and comparing the actual attenuation rate A of the heating capacity with a second attenuation rate T of the heating capacity;
and if A is less than or equal to T, determining that the air conditioning system stops defrosting.
17. The control method according to claim 15 or 16, characterized in that: the calculation formula of the actual attenuation rate A of the heating capacity is as follows:
actual attenuation rate of heating capacity (heating capacity)Is effective-heat generation capacityn) Heating capacityIs effective；
Wherein: heating capacitynThe real-time heating capacity of the air conditioning system is obtained;
heating capacityIs effectiveThe heat production quantity in the operation stage before defrosting of the air conditioning system is realized.
18. The control method according to claim 9, characterized in that: all the heat exchange sections (11) have a heat exchange state and a defrosting state, the air conditioning system has a reverse defrosting mode, and in the reverse defrosting mode, all the heat exchange sections (11) are switched to the heat exchange state;
in step S2, the method further includes:
and if all the heat exchange sections (11) need defrosting, the air conditioning system is switched to a reverse defrosting mode.
19. The control method according to claim 9, characterized in that: the air conditioning system comprises a defrosting pipeline (4), wherein a first end of the defrosting pipeline (4) is directly or indirectly communicated with an exhaust port of the compressor (3), a heat exchange section (11) with a defrosting state is directly or indirectly communicated with a second end of the defrosting pipeline (4), the defrosting branch (5) corresponds to the heat exchange section (11) with the defrosting state one by one, the heat exchange section (11) is communicated with the second end of the defrosting pipeline (4) through the corresponding defrosting branch (5), an on-off mechanism (6) is arranged on the defrosting branch (5), when the heat exchange section (11) is in the heat exchange state, the on-off mechanism (6) on the corresponding defrosting branch (5) is in an off state, and when the heat exchange section (11) is in the defrosting state, the on-off mechanism (6) on the corresponding defrosting branch (5) is in a communication state, and the step S2 further comprises the following steps:
the on-off mechanism (6) on the defrosting branch (5) corresponding to the heat exchange section (11) switched to the defrosting state is switched to the connected state, and the on-off mechanism (6) on the defrosting branch (5) corresponding to the heat exchange section (11) switched to the heat exchange state is switched to the disconnected state.
20. The control method according to claim 9, characterized in that: the air conditioning system includes an outdoor fan, and after step S1, further includes:
the rotation speed of the outdoor fan is increased.
21. The control method according to claim 9, characterized in that: the air conditioning system comprises a compressor (3) and, after step S1:
the energy efficiency output of the compressor (3) is increased.
CN202110492003.1A 2021-05-06 2021-05-06 Air conditioning system and control method thereof Active CN113124513B (en)

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