CN113803859A - Air conditioner, control method, control device, and computer-readable storage medium - Google Patents

Air conditioner, control method, control device, and computer-readable storage medium Download PDF

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Publication number
CN113803859A
CN113803859A CN202010542928.8A CN202010542928A CN113803859A CN 113803859 A CN113803859 A CN 113803859A CN 202010542928 A CN202010542928 A CN 202010542928A CN 113803859 A CN113803859 A CN 113803859A
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China
Prior art keywords
air conditioner
water temperature
bypass valve
hot gas
gas bypass
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CN202010542928.8A
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Chinese (zh)
Inventor
张毅
梁涛
周登青
刘雅岚
贺斌
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Chongqing Midea General Refrigeration Equipment Co Ltd
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Chongqing Midea General Refrigeration Equipment Co Ltd
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Priority to CN202010542928.8A priority Critical patent/CN113803859A/en
Publication of CN113803859A publication Critical patent/CN113803859A/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
    • F24F11/62—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
    • F24F11/50—Control or safety arrangements characterised by user interfaces or communication
    • F24F11/61—Control or safety arrangements characterised by user interfaces or communication using timers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
    • F24F11/63—Electronic processing
    • F24F11/64—Electronic processing using pre-stored data
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/70—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
    • F24F11/86—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling compressors within refrigeration or heat pump circuits
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2140/00—Control inputs relating to system states
    • F24F2140/20—Heat-exchange fluid temperature

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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)
  • Thermal Sciences (AREA)
  • Human Computer Interaction (AREA)
  • Air Conditioning Control Device (AREA)

Abstract

The invention provides an air conditioner, a control method, a control device and a computer readable storage medium. The air conditioner comprises a centrifugal compressor, an evaporator, a condenser and a hot gas bypass valve, wherein the hot gas bypass valve is arranged between the evaporator and the condenser, and the control method of the air conditioner comprises the following steps: judging that the centrifugal compressor reaches the lower limit of the operation load, and controlling the air conditioner to execute a hot gas bypass valve control mode; wherein, under the control mode of the hot gas bypass valve, the hot gas bypass valve participates in the real-time water temperature regulation of the air conditioner. The invention can improve the energy-adjusting logic of the air conditioner, ensure that the air conditioner still has energy-adjusting space when the air conditioner operates at the minimum load, and ensure the stable operation of the air conditioner.

Description

Air conditioner, control method, control device, and computer-readable storage medium
Technical Field
The present invention relates to the field of air conditioners, and in particular, to an air conditioner, a control method, a control device, and a computer-readable storage medium.
Background
Centrifugal compressors enable refrigeration or temperature conditioning equipment, such as air conditioners, to achieve better energy efficiency of the refrigeration unit and a wider operating range. The centrifugal compressor has excellent compression efficiency, simple structure of compression parts, high reliability, and can increase efficiency by an economizer.
However, one of the disadvantages in the related art is that the centrifugal compressor has poor operation stability at the time of minimum load operation.
Disclosure of Invention
The present invention is directed to solving at least one of the above problems.
To this end, a first object of the present invention is to provide a control method of an air conditioner.
A second object of the present invention is to provide an air conditioner.
A third object of the present invention is to provide a control device for an air conditioner.
A fourth object of the present invention is to provide a computer-readable storage medium.
To achieve the first object of the present invention, an embodiment of the present invention provides a control method of an air conditioner, the air conditioner including a centrifugal compressor, an evaporator, a condenser, and a hot gas bypass valve, the hot gas bypass valve being provided between the evaporator and the condenser, the control method of the air conditioner including: judging that the centrifugal compressor reaches the lower limit of the operation load, and controlling the air conditioner to execute a hot gas bypass valve control mode; wherein, under the control mode of the hot gas bypass valve, the hot gas bypass valve participates in the real-time water temperature regulation of the air conditioner.
The embodiment controls the air conditioner to execute the hot gas bypass valve control mode under the condition that the centrifugal compressor reaches the lower limit of the operation load, so that the hot gas bypass valve can participate in the adjustment of the real-time water temperature of the air conditioner through the opening change. The change of the opening degree of the hot gas bypass valve causes the water exchange degree of the evaporator and the condenser to change when unloading or loading, and therefore the change of the real-time water temperature is controlled. Therefore, the opening of the hot gas bypass valve control mode enables the system operation condition of the air conditioner to gradually approach the water temperature stable region.
In addition, the technical solution provided by the above embodiment of the present invention may further have the following additional technical features:
among the above-mentioned technical scheme, centrifugal compressor includes the stator and has real-time operating frequency, judges that centrifugal compressor reaches the operating load lower limit, specifically includes: judging that the air conditioner is under the condition of unloading working condition and the real-time water temperature is less than or equal to a first water temperature threshold value; judging that the real-time operation frequency reaches an operation frequency lower limit value and the opening of the guide vane reaches an opening lower limit value; the first water temperature threshold value is the subtraction difference between the target water temperature of the centrifugal compressor and the first temperature error adjusting parameter.
In the present embodiment, the air conditioner is controlled to execute the hot gas bypass valve control mode under the above-described operating conditions. Thus, the present embodiment can incorporate and utilize the modulating action of the hot gas bypass valve to reduce the pressure ratio of the air conditioner system and thereby reduce the critical frequency of the air conditioner.
In any of the above technical solutions, controlling the air conditioner to execute a hot gas bypass valve control mode specifically includes: and adjusting the opening of the hot gas bypass valve according to the real-time water temperature.
The embodiment can ensure that the degree of change of the opening of the hot gas bypass valve is matched with the water temperature adjusting target of the air conditioner, so as to achieve the aim of promoting the control system of the air conditioner to move to the stable area.
Among any above-mentioned technical scheme, according to the aperture of real-time temperature regulation steam bypass valve, specifically include: under the condition that the air conditioner is in an unloading working condition, the opening degree of the hot gas bypass valve is increased according to the difference between the real-time water temperature and the target water temperature; and/or reducing the opening degree of the hot gas bypass valve according to the difference between the real-time water temperature and the target water temperature under the condition that the air conditioner is in a loading working condition.
The embodiment can enable the air conditioner system to quickly reach the stable region and maintain high refrigeration energy efficiency of the unit under low load.
Among any above-mentioned technical scheme, according to the aperture of real-time temperature regulation steam bypass valve, specifically include: respectively detecting real-time water temperature in each time period of at least two time periods; in the current time period, controlling the opening degree of the hot gas bypass valve according to the difference between the real-time water temperature and the target water temperature in the previous time period; and after the current time period is finished, controlling the opening degree of the hot gas bypass valve in the next time period according to the difference between the real-time water temperature and the target water temperature of the current time period.
The opening degree of the hot gas bypass valve is adjusted according to the real-time water temperature, so that the opening degree of the hot gas bypass valve can be correspondingly changed and adjusted according to the actual change condition of the real-time water temperature.
In any of the above technical solutions, the control method of the air conditioner further includes: under a hot gas bypass valve control mode, judging that the centrifugal compressor is suitable for a recovery guide vane control mode and/or a frequency control mode, and controlling the air conditioner to exit the hot gas bypass valve control mode; the centrifugal compressor comprises guide vanes and has real-time operation frequency, the air conditioner controls the opening degree of the guide vanes to adjust the real-time water temperature in a guide vane control mode, and the air conditioner controls the real-time operation frequency to adjust the real-time water temperature in a frequency control mode.
In the embodiment, under the condition that the guide vanes and the frequency cannot be adjusted, the adjustable logic of the unit is improved through the hot gas bypass valve control mode, so that the unit still has adjustable space, and the stable operation of the unit is realized. When the guide vane tuning space and the frequency tuning space reappear or recover, the present embodiment exits the hot gas bypass valve control mode and preferentially implements guide vane tuning or frequency tuning.
In any of the above technical solutions, determining that the centrifugal compressor is suitable for the recovery guide vane control mode and/or the frequency control mode specifically includes: judging that the real-time water temperature is greater than or equal to the target water temperature of the centrifugal compressor and the opening of the hot gas bypass valve is zero; or judging that the real-time water temperature of the centrifugal compressor is greater than or equal to a second water temperature threshold value; and the second water temperature threshold value is the sum of the target water temperature of the centrifugal compressor and the second temperature error adjusting parameter.
The present embodiment provides specific exit logic for the hot gas bypass valve control mode. When the opening of the hot gas bypass valve is reduced to zero, if the water temperature is still in the loading area, or when the real-time water temperature is larger than or equal to the second water temperature threshold value, the hot gas bypass valve can be withdrawn and adjusted. And the frequency can be adjusted and controlled according to normal guide vanes.
To achieve the second object of the present invention, an embodiment of the present invention provides an air conditioner including: a centrifugal compressor; an evaporator; a condenser; the hot gas bypass valve is arranged between the evaporator and the condenser; and controlling the air conditioner to execute a hot gas bypass valve control mode, wherein the hot gas bypass valve participates in the real-time water temperature regulation of the air conditioner in the hot gas bypass valve control mode.
In the air conditioner of the embodiment, under a hot gas bypass valve control mode, the hot gas bypass valve participates in the real-time water temperature regulation of the air conditioner, so that the purposes of enabling a system of the air conditioner to quickly reach a stable region and enabling a unit of the air conditioner to be kept at high refrigeration energy efficiency under low load are achieved.
To achieve the third object of the present invention, an embodiment of the present invention provides a control apparatus of an air conditioner, including: a memory storing a computer program; a processor executing a computer program; wherein the processor, when executing the computer program, implements the steps of the control method of the tuner according to any of the embodiments of the present invention.
The control device of the air conditioner of this embodiment implements the steps of the control method of the air conditioner according to any embodiment of the present invention, so that it has all the advantages of the control method of the air conditioner according to any embodiment of the present invention, and will not be described herein again.
To achieve the fourth object of the present invention, an embodiment of the present invention provides a computer-readable storage medium including: the computer-readable storage medium stores a computer program implementing the steps of the control method of the modulator according to any one of the embodiments of the present invention.
The computer-readable storage medium of this embodiment implements the steps of the method for controlling a tuner according to any embodiment of the present invention, so that the method has all the advantages of the method for controlling a tuner according to any embodiment of the present invention, and further description is omitted here.
Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a flowchart illustrating steps of a control method of an air conditioner in the related art;
fig. 2 is a flowchart illustrating a first step of a control method of an air conditioner according to an embodiment of the present invention;
fig. 3 is a flowchart illustrating a second step of a control method of an air conditioner according to an embodiment of the present invention;
fig. 4 is a flowchart illustrating a third step of a control method of an air conditioner according to an embodiment of the present invention;
fig. 5 is a flowchart illustrating a fourth step of a control method of an air conditioner according to an embodiment of the present invention;
fig. 6 is a flowchart illustrating a fifth step of a control method of an air conditioner according to an embodiment of the present invention;
fig. 7 is a flowchart illustrating a sixth step of a control method of an air conditioner according to an embodiment of the present invention;
fig. 8 is a flowchart illustrating a seventh step of a control method of an air conditioner according to an embodiment of the present invention;
fig. 9 is a system composition diagram of an air conditioner according to an embodiment of the present invention;
fig. 10 is a system composition diagram of a control apparatus of an air conditioner according to an embodiment of the present invention;
fig. 11 is a flowchart illustrating an eighth step of a method for controlling an air conditioner according to an embodiment of the present invention.
Wherein, the correspondence between the reference numbers and the part names in fig. 9 and 10 is:
100: air conditioner, 110: centrifugal compressor, 120: evaporator, 130: condenser, 140: hot gas bypass valve, 200: control device, 210: memory, 220: a processor.
Detailed Description
In order that the above objects, features and advantages of the present invention can be more clearly understood, a more particular description of the invention will be rendered by reference to the appended drawings. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and therefore the scope of the present invention is not limited by the specific embodiments disclosed below.
An air conditioner 100, a control method, a control apparatus 200, and a computer-readable storage medium according to some embodiments of the present invention are described below with reference to fig. 1 to 11.
Centrifugal compressors are widely used in refrigeration or temperature regulation equipment such as air conditioners, and have many advantages such as high energy efficiency, high efficiency, simple structure and easy control. However, the centrifugal compressor of the related art has a problem in that its operation stability at the time of minimum load operation is not good.
Specifically, as shown in fig. 1, the air conditioner in the related art is controlled by:
step S902, determining that the water temperature is in a stable area;
if yes, step S904 is executed, if no, step S906 is executed,
step S904, maintaining the current guide vane opening and frequency;
step S906, judging that the water temperature is in a loading area;
if yes, go to step S908, and if no, go to step S918;
step S908, determining whether the guide vane reaches the maximum opening degree;
if yes, go to step S910, and if no, go to step S914;
step S910, determining whether the frequency reaches the upper limit of the frequency;
if yes, go to step S912, and if no, go to step S916;
step S912, keeping the maximum guide vane and the maximum frequency, and considering that the unit runs in full load at the moment;
step S914, the opening degree of the guide vane is increased;
step S916, frequency increase;
step S918, judging that the water temperature is in an unloading area;
if yes, executing step S920, otherwise ending;
step S920, judging whether the frequency reaches a lower frequency limit;
if yes, executing step S922, otherwise executing step S926;
step S922, judging whether the guide vane reaches the minimum operation guide vane opening degree;
if yes, executing step S924, and if no, executing step S928;
step S924, keeping a minimum guide vane and a minimum frequency, and considering the minimum load operation of the unit at the moment;
step S926, the frequency is decreased;
in step S928, the guide vane opening degree is decreased.
Specifically, when the water temperature of the air conditioner is in a stable region, the current guide vane opening and frequency of the current centrifugal compressor are kept unchanged. And when the water temperature is in the loading area, judging whether the guide vane reaches the maximum opening degree. If the guide vane does not reach the maximum opening degree, the opening degree of the guide vane is increased, and if the guide vane does not reach the maximum opening degree, whether the frequency reaches the upper frequency limit is further judged. And if the frequency does not reach the upper frequency limit, controlling the frequency to increase, and if the frequency reaches the upper frequency limit, keeping the maximum guide vane and the maximum frequency, and at the moment, regarding the unit as full-load operation. When the water temperature is in the unloading area, whether the frequency reaches the lower frequency limit is judged. If the frequency does not reach the lower frequency limit, the control frequency is reduced, and if the frequency reaches the lower frequency limit, whether the guide vane reaches the minimum operation guide vane opening degree is judged. And if the guide vane does not reach the minimum operation guide vane opening degree, controlling the guide vane opening degree to be reduced, and if the guide vane reaches the minimum operation guide vane opening degree, keeping the minimum guide vane and the minimum frequency, and at the moment, regarding the minimum load operation of the unit.
In the above control method, when the unit of the air conditioner is operated at the minimum load, the water temperature adjustment of the air conditioner may be overshot due to an error in the result of the water temperature detection and a large influence of the guide vane adjustment and the frequency adjustment of the centrifugal compressor on the unit. This problem makes the unit of the air conditioner not well stabilized within the stable region. And moreover, the single guide vane adjustment and frequency adjustment enable the unit of the air conditioner to have low unit refrigeration energy efficiency when the unit runs at the minimum load.
In view of the above, embodiments of the present invention provide the following air conditioner, control method, control device, and computer-readable storage medium.
Example 1:
as shown in fig. 2, the present embodiment provides a method for controlling an air conditioner, the air conditioner includes a centrifugal compressor, an evaporator, a condenser, and a hot gas bypass valve, the hot gas bypass valve is disposed between the evaporator and the condenser, the method for controlling an air conditioner includes:
and step S102, judging that the centrifugal compressor reaches the lower limit of the operation load, and controlling the air conditioner to execute a hot gas bypass valve control mode.
Wherein, under the control mode of the hot gas bypass valve, the hot gas bypass valve participates in the real-time water temperature regulation of the air conditioner.
The air conditioner of the present embodiment is used for cooling and heating adjustment of the temperature of an indoor space. Wherein, when the air conditioner 100 realizes the refrigeration function, the refrigerant from the centrifugal compressor is in sequenceAfter passing through the condenser and evaporator, it returns to the centrifugal compressor, where refrigeration is achieved by the cyclical condensation and evaporation of the refrigerant. A hot gas bypass valve is arranged between the condenser and the evaporator. The hot gas bypass valve of the embodiment can participate in the real-time water temperature T of the air conditionerFruit of Chinese wolfberryAnd (4) adjusting.
The concrete concept of the water temperature in this embodiment is as follows. When the air conditioner realizes the heating function, the water temperature refers to the cooling water outlet temperature of the air conditioner. When the air conditioner realizes a refrigeration function and adopts water outlet control, the water temperature refers to the cooling water outlet temperature of the air conditioner. When the air conditioner realizes the refrigeration function and adopts water inlet control, the water temperature refers to the freezing outlet water temperature of the air conditioner. When the air conditioner performs neither a cooling function nor a heating function, such as dehumidification, the water temperature is the chilled outlet water temperature of the air conditioner.
In the embodiment, under the condition that the centrifugal compressor reaches the lower limit of the running load, the air conditioner is controlled to execute the hot gas bypass valve control mode, so that the hot gas bypass valve can participate in the real-time water temperature T of the air conditioner through the opening changeFruit of Chinese wolfberryAnd (4) adjusting. The change of the opening degree of the hot gas bypass valve causes the water exchange degree of the evaporator and the condenser to change no matter when the water is unloaded or loaded, and the real-time water temperature T is controlled by the change of the opening degree of the hot gas bypass valveFruit of Chinese wolfberryA change in (c). Therefore, the opening of the hot gas bypass valve control mode enables the system operation condition of the air conditioner to gradually approach the water temperature stable region. Meanwhile, when the air conditioner system is unloaded, the pressure ratio of the air conditioner system (namely, the ratio of the exhaust absolute pressure to the suction absolute pressure of the centrifugal compressor) is reduced due to the change of the opening degree of the hot gas bypass valve, and the critical frequency of the air conditioner system is further reduced along with the reduction of the pressure ratio of the system. At this time, the minimum frequency value that the system can operate will also decrease. Thus, the present embodiment brings further room for the offloading of frequency logic. Under such conditions, the system of the air conditioner will preferentially perform frequency offloading. When the frequency unloading reaches the lower limit of the minimum operating frequency and the descending space is not available, the energy adjustment can be realized through the hot gas bypass valve. Therefore, the embodiment can enable the system of the air conditioner to quickly reach the stable area, and ensure the unit of the air conditionerHigh refrigeration energy efficiency at low load.
Example 2:
as shown in fig. 3, the present embodiment provides a control method of an air conditioner, and in addition to the technical features of embodiment 1 described above, the present embodiment further includes the following technical features.
Centrifugal compressor includes the stator and has real-time operating frequency, judges that centrifugal compressor reaches the operating load lower limit, specifically includes:
step S202, judging that the air conditioner is under the unloading working condition and the real-time water temperature T isFruit of Chinese wolfberryLess than or equal to the first water temperature threshold TThreshold 1；
Step S204, judging that the real-time operation frequency reaches the operation frequency lower limit value and the opening degree of the guide vane reaches the opening degree lower limit value.
Wherein the first water temperature threshold TThreshold 1Target water temperature T for centrifugal compressorEyes of a userWith a first temperature error adjustment parameter Δ T1Is determined by the difference of (1).
It should be noted that the real-time water temperature T of the present embodimentFruit of Chinese wolfberryThe air conditioner system air conditioner. Target water temperature TEyes of a userThe air conditioner can be obtained through experiments before the air conditioner leaves a factory and is prestored in a control system or a control element of the air conditioner. First temperature error adjustment parameter Δ T1Can be selected and adjusted by the person skilled in the art according to the actual need, with the aim of characterizing or weighing the first water temperature threshold value TThreshold 1Relative target water temperature TEyes of a userA reduced acceptable level. When the real-time water temperature TFruit of Chinese wolfberryReaches or even falls below the target water temperature T of the centrifugal compressorEyes of a userWith a first temperature error adjustment parameter Δ T1The difference indicates the real-time water temperature TFruit of Chinese wolfberryAlready too low, the centrifugal compressor enters the unloading zone, and at this time, if the real-time operating frequency reaches the operating frequency lower limit and the opening degree of the guide vane reaches the opening degree lower limit, a hot gas bypass valve control mode needs to be executed so that the hot gas bypass valve realizes an auxiliary control regulation effect.
In other words, under the condition that the air conditioner is in the unloading condition, when the water temperature T is in real timeFruit of Chinese wolfberryIs reduced to be less than or equal to the first water temperature threshold TThreshold 1And the air conditioner has reached its operating frequency lower limit and the opening degree lower limit of the guide vane, then the frequency cannot be further reduced at this time, and the opening degree of the guide vane cannot be further reduced. In this condition, the related art typically maintains a minimum guide vane and minimum frequency, and at this time the unit is considered to have been operating at minimum load. One of the differences between the present embodiment and the related art is that the present embodiment controls the air conditioner to perform the hot gas bypass valve control mode under the above-described operating conditions. Thus, the present embodiment can incorporate and utilize the modulating action of the hot gas bypass valve to reduce the pressure ratio of the air conditioner system and thereby reduce the critical frequency of the air conditioner.
Example 3:
as shown in fig. 4, the present embodiment provides a control method of an air conditioner, and in addition to the technical features of any of the above embodiments, the present embodiment further includes the following technical features.
The method for controlling the air conditioner to execute the hot gas bypass valve control mode specifically comprises the following steps:
step S302, according to the real-time water temperature TFruit of Chinese wolfberryAnd adjusting the opening of the hot gas bypass valve.
The embodiment is based on the real-time water temperature TFruit of Chinese wolfberryThe opening degree of the hot gas bypass valve is adjusted, so that the opening degree of the hot gas bypass valve can be adjusted according to the real-time water temperature TFruit of Chinese wolfberryThe actual change of (c) is: real-time water temperature TFruit of Chinese wolfberryWith target water temperature TEyes of a userThe real-time and actual differences, and accordingly, the change adjustment is made. Therefore, the embodiment can ensure that the degree of change of the opening of the hot gas bypass valve is matched with the water temperature adjusting target of the air conditioner, so as to achieve the purpose of prompting the control system of the air conditioner to move to the stable area.
Example 4:
as shown in fig. 5, the present embodiment provides a control method of an air conditioner, and in addition to the technical features of any of the above embodiments, the present embodiment further includes the following technical features.
According to the real-time water temperature TFruit of Chinese wolfberryThe opening degree of the hot gas bypass valve is adjusted, and the method specifically comprises the following steps:
step S402, under the condition that the air conditioner is in the unloading working condition, according to the real-time water temperature TFruit of Chinese wolfberryWith target water temperature TEyes of a userIncreasing the opening of the hot gas bypass valve; and/or
Step S404, under the condition that the air conditioner is in the loading working condition, according to the real-time water temperature TFruit of Chinese wolfberryWith target water temperature TEyes of a userThe opening degree of the hot gas bypass valve is reduced.
The embodiment provides a control mode of the opening degree of the air bypass valve. When the air conditioner is in the unloading working condition, after entering or executing a hot gas bypass valve control mode to adopt the hot gas bypass valve to adjust the water temperature, the opening degree of the hot gas bypass valve is the real-time water temperature T when the water temperature is in the unloading areaFruit of Chinese wolfberry(i.e., current water temperature) and target water temperature TEyes of a userIs calculated according to a formula. In the mode, as the opening degree of the hot gas bypass valve is gradually increased, the water mixing of the evaporator and the condenser is increased, and the real-time water temperature T is increasedFruit of Chinese wolfberryWill gradually rise back and the system of the air conditioner will also get close to the water temperature stable area. Meanwhile, as the opening degree of the hot gas bypass valve is increased, the pressure ratio of the system is reduced, the critical frequency of the system is reduced along with the reduction of the pressure ratio of the system, and the minimum frequency value of the system which can be operated is reduced accordingly. Therefore, under the condition that the air conditioner is in the unloading working condition, the real-time water temperature T is usedFruit of Chinese wolfberryWith target water temperature TEyes of a userThe solution of increasing the opening of the hot gas bypass valve brings further room for the unloading logic of the frequency, in which case the air conditioner system will unload the frequency preferentially. When the frequency is unloaded to the lower limit of the minimum operating frequency and the descending space is not available, the energy can be adjusted again through the hot gas bypass valve, and the system pressure ratio is reduced and the water temperature is increased by increasing the opening of the hot gas bypass valve. Therefore, under the regulation, the air conditioner system can quickly reach a stable region, and high refrigeration energy efficiency of the unit under low load is maintained.
Under the condition that the air conditioner is in a loading working condition, a hot gas bypass valve control mode is entered or executed to adopt hot gasAfter the bypass valve can be adjusted, when the water temperature is in the loading area, the opening degree of the hot gas bypass valve is also the real-time water temperature TFruit of Chinese wolfberry(i.e., current water temperature) and target water temperature TEyes of a userIs calculated according to a formula. When the water temperature is in the loading area, the opening degree of the hot gas bypass valve is continuously reduced. Because the opening of the hot gas bypass valve is reduced, the water mixing of the evaporator and the condenser is reduced, and the real-time water temperature T isFruit of Chinese wolfberryWill descend under the dual function of adding water and reducing with refrigeration operation, the system will be drawn close to towards the temperature stable area equally.
In addition, it should be noted that when the water temperature is in the stable region, the system stability is satisfied, and the unit keeps the current hot gas bypass valve opening and does not operate.
Example 5:
as shown in fig. 6, the present embodiment provides a control method of an air conditioner, and in addition to the technical features of any of the above embodiments, the present embodiment further includes the following technical features.
According to the real-time water temperature TFruit of Chinese wolfberryThe opening degree of the hot gas bypass valve is adjusted, and the method specifically comprises the following steps:
step S502, respectively detecting the real-time water temperature T in each time period T of at least two time periodsFruit of Chinese wolfberry；
Step S504, in the current time period tFront sideAccording to the last time period tOn the upper partReal-time water temperature TFruit of Chinese wolfberryWith target water temperature TEyes of a userControlling the opening of the hot gas bypass valve;
step S506, in the current time period tFront sideAfter the end, according to the current time period tFront sideReal-time water temperature TFruit of Chinese wolfberryWith target water temperature TEyes of a userControlling the hot gas bypass valve for the next time period tLower partThe opening degree of (c).
Specifically, after the hot gas bypass valve control mode is executed, when the water temperature is in the unloading area, the opening degree of the hot gas bypass valve of the embodiment is still the real-time water temperature TFruit of Chinese wolfberry(i.e., current water temperature) and target water temperature TEyes of a userIs calculated according to a formula. This calculation is in units of respective time periods,multiple times. When the time period t does not satisfy the period interval time, the opening degree of the hot gas bypass valve is kept not to be operated in the previous period. And after the time delay of the current time period t is met, recalculating the opening degree of the current time period and outputting the opening degree value again. In this mode, the opening degree of the hot gas bypass valve is gradually increased. When the water temperature is in the loading area after entering the hot gas bypass valve and being adjusted, the opening degree of the hot gas bypass valve is still the real-time water temperature TFruit of Chinese wolfberry(i.e., current water temperature) and target water temperature TEyes of a userIs calculated according to a formula. This calculation is performed a plurality of times in units of respective time periods. When the time period t does not satisfy the period interval time, the opening degree of the hot gas bypass valve is kept not to be operated in the previous period. And after the delay of the current time period t is met, recalculating the opening output value of the current time period. When the water temperature is in the loading area, the opening degree of the hot gas bypass valve is continuously reduced.
Example 6:
as shown in fig. 7, the present embodiment provides a control method of an air conditioner, and in addition to the technical features of any of the above embodiments, the present embodiment further includes the following technical features.
The control method of the air conditioner further includes:
and step S602, under the hot gas bypass valve control mode, judging that the centrifugal compressor is suitable for the recovery guide vane control mode and/or the frequency control mode, and controlling the air conditioner to exit the hot gas bypass valve control mode.
Wherein the centrifugal compressor includes a guide vane and has a real-time operation frequency, and the air conditioner controls an opening degree of the guide vane to adjust a real-time water temperature T in a guide vane control modeFruit of Chinese wolfberryAdjusting, in a frequency control mode, the air conditioner controls the real-time operating frequency to adjust the real-time water temperature TFruit of Chinese wolfberryAnd (6) carrying out adjustment.
In other words, in the embodiment, under the condition that the guide vanes and the frequency cannot be adjusted, the adjusting logic of the unit is improved through the hot gas bypass valve control mode, so that the unit still has an adjusting space, and the stable operation of the unit is realized. When the guide vane tuning space and the frequency tuning space reappear or recover, the present embodiment exits the hot gas bypass valve control mode and preferentially implements guide vane tuning or frequency tuning.
Example 7:
as shown in fig. 8, the present embodiment provides a control method of an air conditioner, and in addition to the technical features of any of the above embodiments, the present embodiment further includes the following technical features.
Determining that the centrifugal compressor is suitable for the recovery guide vane control mode and/or the frequency control mode specifically comprises:
step S702, determining the real-time water temperature TFruit of Chinese wolfberryIs greater than or equal to the target water temperature T of the centrifugal compressorEyes of a userAnd the opening degree of the hot gas bypass valve is zero; or
Step S704, determining the real-time water temperature T of the centrifugal compressorFruit of Chinese wolfberryGreater than or equal to the second water temperature threshold TThreshold 2。
Wherein the second water temperature threshold TThreshold 2Target water temperature T for centrifugal compressorEyes of a userAnd a second temperature error adjusting parameter delta T2The sum of the additions of (a).
The present embodiment provides specific exit logic for the hot gas bypass valve control mode. When the water temperature is in the loading area, the opening degree of the hot gas bypass valve is continuously reduced. Because the opening of the hot gas bypass valve is reduced, the water mixing of the evaporator and the condenser is reduced, and the real-time water temperature T isFruit of Chinese wolfberryWill descend under the dual function of adding water and reducing with refrigeration operation, the system will be drawn close to towards the temperature stable area. When the opening of the hot gas bypass valve is reduced to 0, if the water temperature is still in the loading area, or when the water temperature T is in real timeFruit of Chinese wolfberryGreater than or equal to the second water temperature threshold TThreshold 2When the hot gas bypass valve is closed, the hot gas bypass valve is closed. And the frequency can be adjusted and controlled according to normal guide vanes. Wherein the second water temperature threshold TThreshold 2Target water temperature T for centrifugal compressorEyes of a userAnd a second temperature error adjusting parameter delta T2The sum of the additions of (a). Target water temperature TEyes of a userThe air conditioner can be obtained through experiments before the air conditioner leaves a factory and is prestored in a control system or a control element of the air conditioner. Second temperature error adjustment parameter Δ T2The specific values of (A) can be selected and adjusted by those skilled in the art according to actual needs.
Example 8:
as shown in fig. 9, the present embodiment provides an air conditioner 100 including: a centrifugal compressor 110, an evaporator 120, a condenser 130, and a hot gas bypass valve 140, the hot gas bypass valve 140 being disposed between the evaporator 120 and the condenser 130. Wherein, it is determined that the centrifugal compressor 110 reaches the lower limit of the operation load, the air conditioner 100 is controlled to perform a hot gas bypass valve control mode in which the hot gas bypass valve participates in the real-time water temperature T of the air conditioner 100Fruit of Chinese wolfberryAnd (4) adjusting.
When the air conditioner 100 of the present embodiment performs the cooling function, the refrigerant from the centrifugal compressor 110 flows through the condenser 130 and the evaporator 120 in order and then returns to the centrifugal compressor 110. A hot gas bypass valve 140 is provided between the condenser 130 and the evaporator 120. The hot gas bypass valve 140 of this embodiment participates in the real-time water temperature T of the air conditioner by the control method of the air conditioner of any embodiment of the present invention in the hot gas bypass valve control modeFruit of Chinese wolfberryAnd (4) adjusting.
Example 9:
as shown in fig. 10, the present embodiment provides a control device 200 of an air conditioner, including: a memory 210 and a processor 220. The memory 210 stores a computer program. The processor 220 executes the computer program. Wherein the processor 220, when executing the computer program, implements the steps of the control method of the tuner according to any of the embodiments of the present invention.
Example 10:
the present embodiments provide a computer-readable storage medium, comprising: the computer-readable storage medium stores a computer program implementing the steps of the control method of the modulator according to any one of the embodiments of the present invention.
DETAILED DESCRIPTION OF EMBODIMENT (S) OF INVENTION
The embodiment provides an air conditioner and a control method of the air conditioner, and aims to improve the energy regulation logic of a unit of the air conditioner when the unit runs at the minimum load, so that the unit still has an energy regulation space, realize the stable running of the unit, and improve the energy efficiency of the unit when the unit runs at the minimum load. In order to achieve the above purpose, the air conditioner of the embodiment adopts the following hot gas bypass valve work control logic to participate in the unit energy regulation control.
When the water temperature is in the unloading area and meets the real-time water temperature TFruit of Chinese wolfberryLess than or equal to the target water temperature TEyes of a userWith a first temperature error adjustment parameter Δ T1And the regulating logic will enter the hot gas bypass valve regulating control logic under the condition that the opening and frequency of the guide vanes can not be unloaded any more. When the real-time water temperature TFruit of Chinese wolfberryGreater than or equal to the target water temperature TEyes of a userAnd the opening HGV (T) of the hot gas bypass valve is zero at the moment or the real-time water temperature T isFruit of Chinese wolfberryGreater than or equal to the target water temperature TEyes of a userAnd a second temperature error adjusting parameter delta T2Under the condition of the addition sum of the energy regulating logic, the energy regulating logic can be controlled by exiting the hot gas bypass valve and entering the normal guide vane and frequency energy regulating logic. The working principle of the hot gas bypass valve of the embodiment can be adjusted as follows.
The control logic of the hot gas bypass valve in the water temperature unloading area is as follows: when the water temperature is in the unloading area after entering the hot gas bypass valve and being adjusted, the opening HGV (T) of the hot gas bypass valve is the real-time water temperature TFruit of Chinese wolfberryWith target water temperature TEyes of a userIs calculated according to a formula. This calculation is performed in cycles, and when the delay time t does not satisfy the cycle interval time Thgv, the opening hgv (t) of the hot-gas bypass valve is kept inactive for the previous cycle. And after the time delay of the period is met, recalculating the opening output value of the period. The hot gas bypass valve opening hgv (t) calculated by this process will be continuously increasing. Because the opening of the hot gas bypass valve is increased, the water mixing of the evaporator and the condenser is increased, the current water temperature T rises, and the system approaches to the water temperature stable area. Meanwhile, as the opening degree of the hot gas bypass valve is increased, the pressure ratio PB of the system is reduced, and as the pressure ratio PB of the system is reduced, the critical frequency Fy of the system is reduced, and the minimum frequency value at which the system can operate is reduced. The offloading logic of the frequency is given a drop space in which case the system offloads the priority frequency. When the frequency is unloaded to the lower limit of the minimum operating frequency, no descending space is available, and the opening of the hot gas bypass valve is increased by adjusting the hot gas bypass valve, so that the pressure ratio of the system is reduced and the water temperature is increased. Under the regulation, the system can quickly arriveAnd stabilizing the zone and keeping high refrigeration energy efficiency of the unit under low load.
The control logic of the hot gas bypass valve in the water temperature loading area is as follows: when the water temperature is in the loading area after entering the hot gas bypass valve and being adjusted, the opening HGV (T) of the hot gas bypass valve is the target water temperature TEyes of a userWith target water temperature TEyes of a userIs calculated according to a formula. This calculation is also periodic, and when the delay time t does not satisfy the period interval Thgv, the opening hgv (t) of the hot-gas bypass valve keeps the calculated value of the previous period inactive. And after the time delay of the period is met, recalculating the opening output value of the period. The hot gas bypass valve opening hgv (t) is continuously decreasing when the water temperature is in the load zone. Because the opening of the hot gas bypass valve is reduced, the water adding amount of the evaporator and the condenser is reduced, the current water temperature T is reduced under the double effects of water adding reduction and refrigerating operation, and the system is close to the water temperature stable area. When the hot gas bypass valve opening HGV (T) is reduced to 0, if the water temperature is still in the loading zone, or when the water temperature T is in real timeFruit of Chinese wolfberryGreater than or equal to the target water temperature TEyes of a userAnd a second temperature error adjusting parameter delta T2In the case of the sum of (c), the hot gas bypass valve will now be exited and can be adjusted. And the frequency can be adjusted and controlled according to normal guide vanes.
The control logic of the hot gas bypass valve in the water temperature stable area is as follows: when the water temperature is in a stable area, the system stability is met at the moment, and the unit keeps the current opening HGV (t) of the hot gas bypass valve not to act.
Specifically, as shown in fig. 11, the air conditioner and the control method of the air conditioner of the present embodiment include the steps of:
step S802, judging that the hot gas bypass valve adjustable flag is 1;
if yes, executing step S804, otherwise ending;
step S804, judging that the water temperature is in an unloading area;
if yes, go to step S806;
step S806, judging that the delay time t is not less than the periodic interval time ThgV;
if yes, go to step S808;
step S808, determining that the current frequency Fn is less than or equal to (critical frequency Fy + critical frequency margin Fyl + frequency control tolerance FRc);
if yes, go to step S810, and if no, go to step S812;
step S810, increasing the opening of the hot gas bypass valve HGV (t), and clearing the delay time t;
in step S812, the frequency offload logic delay time t is cleared.
Specifically, the present embodiment first determines whether the air conditioner satisfies the condition "hot gas bypass valve adjustable flag is 1", and when the determination result is yes, determines whether the water temperature is in the unloading zone. If yes, the judgment is made as to whether the delay time t is larger than or equal to the periodic interval time ThgV. If the determination result is yes, it is determined whether the current frequency Fn is satisfied to be less than or equal to (critical frequency Fy + critical frequency margin Fyl + frequency control tolerance FRc). If the determination result is yes, the delay time t zero of the hot gas bypass valve opening HGV (t) is increased. And if the judgment result is negative, clearing the delay time t of the frequency unloading logic.
In summary, the embodiment of the invention has the following beneficial effects: in the embodiment, under the condition that the centrifugal compressor reaches the lower limit of the running load, the air conditioner is controlled to execute the hot gas bypass valve control mode, so that the hot gas bypass valve can participate in the real-time water temperature T of the air conditioner through the opening changeFruit of Chinese wolfberryAnd (4) adjusting. The change of the opening degree of the hot gas bypass valve causes the water exchange degree of the evaporator and the condenser to change no matter when the water is unloaded or loaded, and the real-time water temperature T is controlled by the change of the opening degree of the hot gas bypass valveFruit of Chinese wolfberryA change in (c). Therefore, the opening of the hot gas bypass valve control mode enables the system operation condition of the air conditioner to gradually approach the water temperature stable region.
In the present invention, the terms "first", "second", and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance; the term "plurality" means two or more unless expressly limited otherwise. The terms "mounted," "connected," "fixed," and the like are to be construed broadly, and for example, "connected" may be a fixed connection, a removable connection, or an integral connection; "coupled" may be direct or indirect through an intermediary. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "left", "right", "front", "rear", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the referred device or unit must have a specific direction, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.
In the description herein, the description of the terms "one embodiment," "some embodiments," "specific embodiments," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. A control method of an air conditioner is characterized in that the air conditioner comprises a centrifugal compressor, an evaporator, a condenser and a hot gas bypass valve, the hot gas bypass valve is arranged between the evaporator and the condenser, and the control method of the air conditioner comprises the following steps:
judging that the centrifugal compressor reaches the lower limit of the operation load, and controlling the air conditioner to execute a hot gas bypass valve control mode;
wherein, under the control mode of the hot gas bypass valve, the hot gas bypass valve participates in the adjustment of the real-time water temperature of the air conditioner.
2. The method for controlling an air conditioner according to claim 1, wherein the centrifugal compressor includes a guide vane and has a real-time operating frequency, and the determining that the centrifugal compressor reaches an operating load lower limit specifically includes:
judging that the air conditioner is under the condition of an unloading working condition and the real-time water temperature is smaller than or equal to a first water temperature threshold value;
judging that the real-time running frequency reaches a running frequency lower limit value and the opening degree of the guide vane reaches an opening degree lower limit value;
and the first water temperature threshold is the subtraction difference between the target water temperature of the centrifugal compressor and the first temperature error adjusting parameter.
3. The method for controlling an air conditioner according to claim 1, wherein the controlling the air conditioner to perform a hot gas bypass valve control mode specifically comprises:
and adjusting the opening degree of the hot gas bypass valve according to the real-time water temperature.
4. The method for controlling an air conditioner according to claim 3, wherein the adjusting the opening degree of the hot gas bypass valve according to the real-time water temperature specifically comprises:
under the condition that the air conditioner is in an unloading working condition, increasing the opening degree of the hot gas bypass valve according to the difference between the real-time water temperature and the target water temperature; and/or
And under the condition that the air conditioner is in a loading working condition, reducing the opening degree of the hot gas bypass valve according to the difference between the real-time water temperature and the target water temperature.
5. The method for controlling an air conditioner according to claim 3, wherein the adjusting the opening degree of the hot gas bypass valve according to the real-time water temperature specifically comprises:
respectively detecting the real-time water temperature in each time period of at least two time periods;
in the current time period, controlling the opening degree of the hot gas bypass valve according to the difference between the real-time water temperature and the target water temperature in the previous time period;
and after the current time period is finished, controlling the opening degree of the hot gas bypass valve in the next time period according to the difference between the real-time water temperature and the target water temperature in the current time period.
6. The control method of an air conditioner according to claim 1, further comprising:
in the hot gas bypass valve control mode, judging that the centrifugal compressor is suitable for returning to a guide vane control mode and/or a frequency control mode, and controlling the air conditioner to exit the hot gas bypass valve control mode;
wherein, centrifugal compressor includes the stator and has real-time operating frequency, under the stator control mode, the air conditioner control the aperture of stator is in order to right real-time water temperature adjusts, under the frequency control mode, the air conditioner control real-time operating frequency is in order to right real-time water temperature adjusts.
7. The method for controlling an air conditioner according to claim 6, wherein the determining that the centrifugal compressor is suitable for a return guide vane control mode and/or a frequency control mode specifically includes:
determining that the real-time water temperature is greater than or equal to a target water temperature of the centrifugal compressor and the opening of the hot gas bypass valve is zero; or
Judging that the real-time water temperature of the centrifugal compressor is greater than or equal to a second water temperature threshold value;
and the second water temperature threshold is the sum of the target water temperature of the centrifugal compressor and the second temperature error adjusting parameter.
8. An air conditioner, comprising:
a centrifugal compressor;
an evaporator;
a condenser;
the hot gas bypass valve is arranged between the evaporator and the condenser;
and controlling the air conditioner to execute a hot gas bypass valve control mode when the centrifugal compressor reaches the lower limit of the operation load, wherein the hot gas bypass valve participates in the adjustment of the real-time water temperature of the air conditioner in the hot gas bypass valve control mode.
9. A control apparatus of an air conditioner, comprising:
a memory storing a computer program;
a processor executing the computer program;
wherein the processor, when executing the computer program, implements the steps of the control method of a tuner as claimed in any one of claims 1 to 7.
10. A computer-readable storage medium, comprising:
the computer-readable storage medium stores a computer program implementing the steps of the control method of the modulator according to any one of claims 1 to 7.
CN202010542928.8A 2020-06-15 2020-06-15 Air conditioner, control method, control device, and computer-readable storage medium Pending CN113803859A (en)

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