CN111023464B - Heat exchanger heat exchange efficiency attenuation detection method and device of air conditioner and air conditioner - Google Patents

Heat exchanger heat exchange efficiency attenuation detection method and device of air conditioner and air conditioner Download PDF

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Publication number
CN111023464B
CN111023464B CN201911295852.7A CN201911295852A CN111023464B CN 111023464 B CN111023464 B CN 111023464B CN 201911295852 A CN201911295852 A CN 201911295852A CN 111023464 B CN111023464 B CN 111023464B
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heat exchanger
air conditioner
temperature
inlet
refrigerant
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CN111023464A (en
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朱礼晋
李存永
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Ningbo Aux Electric Co Ltd
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Ningbo Aux Electric Co Ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
    • F24F11/46—Improving electric energy efficiency or saving
    • 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
    • F24F11/49—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring ensuring correct operation, e.g. by trial operation or configuration checks
    • 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
    • F24F11/62—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
    • F24F11/86—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
    • F24F2110/00—Control inputs relating to air properties
    • F24F2110/10—Temperature
    • F24F2110/12—Temperature of the outside air
    • 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

Abstract

The embodiment of the invention provides a method and a device for detecting heat exchange efficiency attenuation of a heat exchanger of an air conditioner and the air conditioner, and relates to the technical field of air conditioners. The method for detecting the attenuation of the heat exchange efficiency of the heat exchanger of the air conditioner comprises the following steps: the method comprises the steps of obtaining the temperature of a first heat exchanger inlet refrigerant and the temperature of a first heat exchanger outlet refrigerant of a heat exchanger of an air conditioner external unit in a first use time period and in a refrigeration mode of the air conditioner, so as to obtain the temperature difference of the first heat exchanger inlet and outlet refrigerants. And acquiring the inlet refrigerant temperature of the second heat exchanger and the outlet refrigerant temperature of the second heat exchanger of the air conditioner in a second use time period and in the refrigerating mode to obtain the temperature difference of the inlet refrigerant and the outlet refrigerant of the second heat exchanger. And if the temperature difference of the inlet and outlet refrigerants of the second heat exchanger is larger than that of the inlet and outlet refrigerants of the first heat exchanger, determining that the heat exchange efficiency of the heat exchanger in the second use time period is attenuated relative to the heat exchange efficiency of the heat exchanger in the first use time period. The method can realize effective monitoring of the heat exchange efficiency of the heat exchanger.

Description

Heat exchanger heat exchange efficiency attenuation detection method and device of air conditioner and air conditioner
Technical Field
The invention relates to the technical field of air conditioners, in particular to a method and a device for detecting heat exchange efficiency attenuation of a heat exchanger of an air conditioner and the air conditioner.
Background
At present, after the air conditioner is installed and used, the heat exchange efficiency of the heat exchanger is not effectively monitored, when the heat exchanger is dirty and blocked, and the heat exchange efficiency is reduced due to the fact that the heat exchanger is rewound, the heat exchanger is not effectively monitored, and the user cannot be reminded easily.
Disclosure of Invention
The invention solves the problem that the heat exchange efficiency of the heat exchanger of the air conditioner is not effectively monitored.
In order to solve the above problems, embodiments of the present invention provide a method and an apparatus for detecting attenuation of heat exchange efficiency of a heat exchanger of an air conditioner, and an air conditioner.
In a first aspect, an embodiment of the present invention provides a method for detecting attenuation of heat exchange efficiency of a heat exchanger of an air conditioner, including:
acquiring a first heat exchanger inlet refrigerant temperature and a first heat exchanger outlet refrigerant temperature of a heat exchanger of an air conditioner outdoor unit in a first use time period and in a refrigeration mode to obtain a first heat exchanger inlet and outlet refrigerant temperature difference;
acquiring the inlet refrigerant temperature and the outlet refrigerant temperature of a second heat exchanger of the heat exchanger in a second use time period and in a refrigeration mode of the air conditioner to obtain the temperature difference of the inlet refrigerant and the outlet refrigerant of the second heat exchanger;
and if the temperature difference of the inlet and outlet refrigerants of the second heat exchanger is greater than the temperature difference of the inlet and outlet refrigerants of the first heat exchanger, determining that the heat exchange efficiency of the heat exchanger in the second use time period is attenuated relative to the heat exchange efficiency of the heat exchanger in the first use time period.
The method for detecting the attenuation of the heat exchange efficiency of the heat exchanger of the air conditioner provided by the embodiment of the invention judges whether the heat exchange efficiency of the heat exchanger has attenuation or not through the temperature of the inlet/outlet refrigerant of the heat exchanger of the air conditioner outdoor unit, so that the heat exchange efficiency of the heat exchanger is effectively monitored, and when the attenuation of the heat exchange efficiency of the heat exchanger is monitored, a signal is only sent to remind a user, so that the user can conveniently process the conditions of filth blockage, inversion and the like of the heat exchanger, which reduce the heat exchange efficiency, and the heat exchange efficiency of the heat exchanger is ensured.
In an optional embodiment, the step of obtaining a second heat exchanger inlet refrigerant temperature and a second heat exchanger outlet refrigerant temperature of the heat exchanger in the second usage time period and in the cooling mode of the air conditioner to obtain a second heat exchanger inlet/outlet refrigerant temperature difference includes:
controlling the air conditioner to work in a cooling mode within a second use time period, so that the temperature of the refrigerant at the inlet of the second heat exchanger of the heat exchanger is equal to the temperature of the refrigerant at the inlet of the first heat exchanger;
acquiring the temperature of the refrigerant at the outlet of the second heat exchanger;
if the temperature difference of the inlet and outlet refrigerants of the second heat exchanger is larger than the temperature difference of the inlet and outlet refrigerants of the first heat exchanger, the step of determining that the heat exchange efficiency of the heat exchanger in the second using time period is attenuated relative to the heat exchange efficiency of the heat exchanger in the first using time period comprises the following steps:
and if the difference value between the outlet refrigerant temperature of the second heat exchanger and the outlet refrigerant temperature of the first heat exchanger is greater than or equal to a preset difference value, determining that the heat exchange efficiency of the heat exchanger in the second service time period is attenuated relative to the heat exchange efficiency of the heat exchanger in the first service time period.
In an optional embodiment, the step of controlling the air conditioner to operate in the cooling mode in the second usage period of time so that the second heat exchanger inlet refrigerant temperature of the heat exchanger is equal to the first heat exchanger inlet refrigerant temperature includes:
if the temperature of the refrigerant at the inlet of the second heat exchanger is lower than that of the refrigerant at the inlet of the first heat exchanger, controlling the opening degree of an electronic expansion valve of an inner machine of the air conditioner to keep an initial opening degree, and increasing the running frequency of a compressor of the air conditioner;
if the temperature of the refrigerant at the inlet of the second heat exchanger is higher than that of the refrigerant at the inlet of the first heat exchanger, controlling the opening degree of an electronic expansion valve of an inner machine of the air conditioner to keep the initial opening degree, and reducing the running frequency of the compressor;
and if the temperature of the refrigerant at the inlet of the second heat exchanger is equal to the temperature of the refrigerant at the inlet of the first heat exchanger, controlling the opening degree of an electronic expansion valve of an inner machine of the air conditioner to keep an initial opening degree, and controlling the running frequency of the compressor to keep unchanged.
In an optional embodiment, the step of obtaining a first heat exchanger inlet refrigerant temperature and a first heat exchanger outlet refrigerant temperature of a heat exchanger of an outdoor unit of an air conditioner in a first usage time period and in a cooling mode to obtain a first heat exchanger inlet/outlet refrigerant temperature difference includes:
acquiring a first working condition of the air conditioner working in a refrigeration mode within a first use time period, and the inlet refrigerant temperature and the outlet refrigerant temperature of the first heat exchanger of the heat exchanger;
before the step of controlling the air conditioner to work in a second use time period and in a refrigeration mode so that the temperature of the refrigerant at the inlet of the second heat exchanger of the heat exchanger is equal to the temperature of the refrigerant at the inlet of the first heat exchanger, the method further comprises the following steps:
and controlling the air conditioner to work under a second working condition which is the same as the first working condition in the second use time period and in a refrigeration mode.
In an alternative embodiment, the first operating condition comprises a determined standard outer loop temperature, and the second operating condition comprises an actual outer loop temperature;
the step of controlling the air conditioner to operate under a second operating condition, which is the same as the first operating condition, in the cooling mode for the second period of use includes:
and controlling the air conditioner to work in the second use time period and in a refrigeration mode until the actual outer ring temperature reaches the judgment standard outer ring temperature.
In an optional embodiment, the step of obtaining a first heat exchanger inlet refrigerant temperature and a first heat exchanger outlet refrigerant temperature of a heat exchanger of an outdoor unit of the air conditioner in a first usage time period and in a cooling mode to obtain a first heat exchanger inlet/outlet refrigerant temperature difference further includes:
acquiring the outdoor ambient temperature of the air conditioner in the first use time period and in a refrigeration mode;
marking the temperature value with the longest occurrence time in the outdoor side environment temperature as the judgment standard outer ring temperature;
the step of obtaining a first working condition of the air conditioner working in a first use time period and in a refrigeration mode, and the first heat exchanger inlet refrigerant temperature and the first heat exchanger outlet refrigerant temperature of the heat exchanger includes:
and acquiring the inlet refrigerant temperature of the first heat exchanger and the outlet refrigerant temperature of the first heat exchanger of the heat exchanger when the air conditioner performs refrigeration work within a first use time period and under the judgment standard outer ring temperature.
In an alternative embodiment, the first operating condition includes a first fan speed; the second working condition comprises a second fan speed;
the step of controlling the air conditioner to operate under a second operating condition, which is the same as the first operating condition, in the cooling mode for the second period of use includes:
and controlling the air conditioner to work in the second use time period and in a refrigeration mode, so that the rotating speed of the second fan is equal to that of the first fan.
In an alternative embodiment, the first operating condition includes a first heat exchanger outlet refrigerant flow rate; the second working condition comprises the outlet refrigerant flow of the second heat exchanger;
the step of controlling the air conditioner to operate under a second operating condition, which is the same as the first operating condition, in the cooling mode for the second period of use includes:
and controlling the air conditioner to work in the second use time period and in the refrigeration mode, so that the flow of the refrigerant at the outlet of the second heat exchanger is equal to the flow of the refrigerant at the outlet of the first heat exchanger.
In an optional embodiment, the controlling the air conditioner to operate in the cooling mode during the second usage period includes:
if the outlet refrigerant flow of the second heat exchanger is smaller than the outlet refrigerant flow of the first heat exchanger, the opening degree of an internal electronic expansion valve of the air conditioner is increased;
if the outlet refrigerant flow of the second heat exchanger is larger than that of the first heat exchanger, reducing the opening degree of an internal electronic expansion valve of the air conditioner;
and if the outlet refrigerant flow of the second heat exchanger is equal to the outlet refrigerant flow of the first heat exchanger, keeping the opening degree of an electronic expansion valve of an inner machine of the air conditioner unchanged.
In a second aspect, an embodiment of the present invention provides an apparatus for detecting attenuation of heat exchange efficiency of a heat exchanger of an air conditioner, including:
the first acquisition module is used for acquiring the inlet refrigerant temperature of a first heat exchanger and the outlet refrigerant temperature of the first heat exchanger of a heat exchanger of an air conditioner outdoor unit in a first use time period and in a refrigeration mode so as to obtain the inlet and outlet refrigerant temperature difference of the first heat exchanger;
the second acquisition module is used for acquiring the temperature of a second heat exchanger inlet refrigerant and the temperature of a second heat exchanger outlet refrigerant of the heat exchanger in a second use time period and in a refrigeration mode of the air conditioner so as to obtain the temperature difference of the inlet refrigerant and the outlet refrigerant of the second heat exchanger;
and the determining module is used for determining that the heat exchange efficiency of the heat exchanger in the second service time period is attenuated relative to the heat exchange efficiency of the heat exchanger in the first service time period if the temperature difference of the inlet and outlet refrigerants of the second heat exchanger is greater than the temperature difference of the inlet and outlet refrigerants of the first heat exchanger.
The heat exchanger heat exchange efficiency attenuation detection device of the air conditioner provided by the embodiment of the invention judges whether the heat exchange efficiency of the heat exchanger is attenuated or not through the temperature of the inlet and outlet refrigerants of the heat exchanger of the air conditioner outdoor unit in the air conditioner, so that the heat exchange efficiency of the heat exchanger is effectively monitored, and when the heat exchange efficiency of the heat exchanger is monitored to be attenuated, a signal is only sent to remind a user, so that the user can conveniently process the conditions of filth blockage, inversion and the like of the heat exchanger, which reduce the heat exchange efficiency, and the heat exchange efficiency of the heat exchanger is ensured.
In a third aspect, an embodiment of the present invention provides an air conditioner, including a controller, where the controller is configured to execute a computer instruction to implement the method for detecting heat exchange efficiency attenuation of a heat exchanger of an air conditioner according to any one of the foregoing embodiments.
The air conditioner provided by the embodiment of the invention judges whether the heat exchange efficiency of the heat exchanger is attenuated or not through the inlet and outlet refrigerant temperature of the heat exchanger of the air conditioner outdoor unit, so that the heat exchange efficiency of the heat exchanger is effectively monitored, and when the attenuation of the heat exchange efficiency of the heat exchanger is monitored, a signal is only sent to remind a user, so that the user can conveniently process the conditions of dirty blockage, inverted sheets and the like of the heat exchanger, which reduce the heat exchange efficiency, and the heat exchange efficiency of the heat exchanger is ensured.
Drawings
Fig. 1 is a block diagram illustrating a system structure of an air conditioner according to an embodiment of the present invention;
fig. 2 is a schematic view of a connection structure of a controller of an air conditioner according to an embodiment of the present invention;
fig. 3 is a schematic flow chart of a method for detecting attenuation of heat exchange efficiency of a heat exchanger of an air conditioner according to an embodiment of the present invention;
FIG. 4 is a flowchart illustrating the sub-steps of step S100 in FIG. 3;
FIG. 5 is a flowchart illustrating the sub-steps of step S200 in FIG. 3;
FIG. 6 is a flowchart illustrating the sub-steps of step S300 in FIG. 3;
fig. 7 is a schematic diagram of functional modules of a heat exchanger heat exchange efficiency attenuation detection device of an air conditioner according to an embodiment of the present invention.
Description of reference numerals:
10-an air conditioner; 100-a compressor; 110-a pressure sensor; 120-a four-way valve; 130-a heat exchanger; 131-a first temperature sensor; 132-a second temperature sensor; 133-a third temperature sensor; 140-an outdoor unit electronic expansion valve; 150-a flow meter; 160-first stop valve; 170-internal machine electronic expansion valve; 180-inner machine; 190-a second stop valve; 20-a controller; 200-a heat exchanger heat exchange efficiency attenuation detection device of an air conditioner; 210-a first obtaining module; 220-a second acquisition module; 230 — a determination module.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
The embodiment of the invention provides a heat exchanger heat exchange efficiency attenuation detection method and a heat exchanger heat exchange efficiency attenuation detection device of an air conditioner, which are applied to the air conditioner 10 and used for monitoring the heat exchange efficiency of a heat exchanger 130 of an air conditioner external unit of the air conditioner 10.
Referring to fig. 1, fig. 1 is a system structure block diagram of an air conditioner 10 according to an embodiment of the present invention, wherein arrows in fig. 1 indicate a flow direction of a refrigerant when the air conditioner 10 is in a cooling mode. In this embodiment, the air conditioner 10 includes a compressor 100, a pressure sensor 110, a four-way valve 120, a heat exchanger 130, an external electronic expansion valve 140, a flow meter 150, a first cutoff valve 160, an internal electronic expansion valve 170, an internal unit 180, and a second cutoff valve 190. The compressor 100 is connected to a first port of the four-way valve 120, and the pressure sensor 110 is disposed on a pipeline between the four-way valve 120 and the compressor 100. A second port of the four-way valve 120 is connected to a refrigerant inlet of the heat exchanger 130, and a refrigerant outlet of the heat exchanger 130 is connected to the outdoor unit electronic expansion valve 140. The heat exchanger 130 is provided in an air conditioner outdoor unit of the air conditioner 10, and exchanges heat as a condenser in a cooling mode. A first temperature sensor 131 is arranged on a refrigerant inlet of the heat exchanger 130 and used for detecting the temperature of the refrigerant at the inlet of the heat exchanger when the refrigerant flows into the heat exchanger 130 from the refrigerant inlet; a second temperature sensor 132 is disposed at a refrigerant outlet of the heat exchanger 130, and is configured to detect a temperature of the heat exchanger outlet refrigerant when the refrigerant flows out of the heat exchanger 130 through the refrigerant outlet. In addition, a third temperature sensor 133 is disposed on the heat exchanger 130 for detecting the outdoor ambient temperature. The outdoor electronic expansion valve 140, the flow meter 150, the first stop valve 160 and the indoor electronic expansion valve 170 are sequentially connected, wherein the flow meter 150 is used for detecting the flow of the refrigerant at the outlet of the heat exchanger 130 when the refrigerant flows out of the heat exchanger 130 from the outlet of the refrigerant, and the indoor electronic expansion valve 170 is disposed in the indoor unit 180. The inner unit 180 is connected to the third port of the four-way valve 120 via a second shut-off valve 190, and the fourth port of the four-way valve 120 is connected to the compressor 100.
The air conditioner 10 operates in a cooling mode, in which a refrigerant flows out of the compressor 100, passes through the four-way valve 120, flows into the heat exchanger 130 through a refrigerant inlet, exchanges heat through the heat exchanger 130, flows out of the heat exchanger 130 through a refrigerant outlet, sequentially passes through the outdoor unit electronic expansion valve 140, the flow meter 150, the first stop valve 160 and the indoor unit electronic expansion valve 170, and exchanges heat with air sucked into the indoor unit 180 in the indoor unit 180, thereby achieving cooling. The refrigerant flows out of the indoor unit 180, passes through the second cutoff valve 190, and flows back to the compressor 100 through the four-way valve 120.
Referring to fig. 2, the air conditioner 10 further includes a controller 20, and the controller 20 is electrically connected to the first temperature sensor 131, the second temperature sensor 132, the third temperature sensor 133, the outdoor electronic expansion valve 140, the flow meter 150, and the indoor electronic expansion valve 170, respectively. The controller 20 is configured to receive a heat exchanger inlet refrigerant temperature when the refrigerant flows into the heat exchanger 130 from a refrigerant inlet, which is acquired by the first temperature sensor 131, receive a heat exchanger outlet refrigerant temperature when the refrigerant flows out of the heat exchanger 130 from a refrigerant outlet, which is acquired by the second temperature sensor 132, and receive an outdoor side ambient temperature acquired by the third temperature sensor 133. In addition, the controller 20 is also used to control the opening and closing of the outer electronic expansion valve 140 and the inner electronic expansion valve 170, and the opening degree. The controller 20 is further configured to receive an outlet refrigerant flow rate of the heat exchanger 130 when the refrigerant collected by the flow meter 150 flows out of the heat exchanger 130 through an outlet refrigerant outlet.
The controller 20 may be an integrated circuit chip having signal processing capabilities. The controller 20 may be a general-purpose processor, and may include a Central Processing Unit (CPU), a single chip Microcomputer (MCU), a Micro Controller Unit (MCU), a Complex Programmable Logic Device (CPLD), a Field Programmable Gate Array (FPGA), an Application Specific Integrated Circuit (ASIC), an embedded ARM, and other chips, where the controller 20 may implement or execute the methods, steps, and Logic blocks disclosed in the embodiments of the present invention.
In a possible implementation manner, the air conditioner 10 may further include a memory for storing program instructions executable by the controller 20, for example, the heat exchanger heat exchange efficiency degradation detection apparatus of the air conditioner provided in the embodiment of the present application includes at least one device that can be stored in the form of software or firmware in the memory. The Memory may be a stand-alone external Memory including, but not limited to, Random Access Memory (RAM), Read Only Memory (ROM), Programmable Read-Only Memory (PROM), Erasable Read-Only Memory (EPROM), electrically Erasable Read-Only Memory (EEPROM). The memory may also be integrated with the controller 20, for example the memory may be integrated with the controller 20 on the same chip.
Based on the air conditioner 10, please refer to fig. 3, the method for detecting attenuation of heat exchange efficiency of a heat exchanger of an air conditioner external unit according to this embodiment is used to monitor the heat exchange efficiency of the heat exchanger 130 of the air conditioner external unit of the air conditioner 10. The method for detecting the attenuation of the heat exchange efficiency of the heat exchanger of the air conditioner provided by the embodiment comprises the following steps S100-S300.
Step S100, a first heat exchanger inlet refrigerant temperature and a first heat exchanger outlet refrigerant temperature of the heat exchanger 130 of the air conditioner external unit in the first usage time period and in the cooling mode of the air conditioner 10 are obtained, so as to obtain a first heat exchanger inlet/outlet refrigerant temperature difference.
In this embodiment, in step S100, the first usage time period is set according to actual needs, and may be, for example, the first year after the air conditioner 10 is installed and used. The first usage period is used as a reference for the usage of the air conditioner 10, and the detection data for determining the heat exchange efficiency of the heat exchanger 130 are compared with the data of the first usage period.
The first heat exchanger inlet refrigerant temperature (denoted by E1) is detected by the first temperature sensor 131, and the first heat exchanger outlet refrigerant temperature (denoted by F1) is detected by the second temperature sensor 132. The temperature difference of the inlet and outlet refrigerants of the first heat exchanger is the difference value obtained by subtracting the temperature of the inlet refrigerant of the first heat exchanger from the temperature of the outlet refrigerant of the first heat exchanger. The principle of judging the heat exchange efficiency of the heat exchanger 130 of the present invention is to judge the heat exchange efficiency by the temperature difference of the refrigerant at the inlet and the outlet of the heat exchanger, and the judgment can be made by any one of the following three ways:
and in the mode A, the temperature difference of the refrigerant at the inlet and the outlet of the heat exchanger is directly compared.
And B, reflecting the temperature difference of the inlet and outlet refrigerants of the heat exchanger on the side surface by controlling the temperature of the inlet refrigerant of the heat exchanger to be unchanged and monitoring the temperature change of the outlet refrigerant of the heat exchanger.
And C, reflecting the temperature difference of the inlet refrigerant and the outlet refrigerant of the heat exchanger on the side surface by controlling the temperature of the outlet refrigerant of the heat exchanger to be unchanged and monitoring the temperature change of the inlet refrigerant of the heat exchanger.
The present embodiment adopts the mode B. In a first usage time period after the air conditioner 10 is installed and used, the first heat exchanger inlet refrigerant temperature and the first heat exchanger outlet refrigerant temperature of the heat exchanger 130 of the air conditioner 10 in the refrigeration mode are detected and recorded.
Referring to fig. 4, in order to make the determination of the heat exchange efficiency of the heat exchanger 130 easier and more accurate, the step S100 may include the following sub-steps S110 to S130.
In the sub-step S110, the outdoor ambient temperature of the air conditioner 10 in the first usage period and in the cooling mode is obtained.
In the present embodiment, the outdoor ambient temperature (indicated by G) is detected by the third temperature sensor 133. During a first period of use of the air conditioner 10 after installation, the air conditioner operates in a cooling mode, and the outdoor ambient temperature is detected and recorded.
And a substep S120, marking the temperature value with the longest occurrence time in the outdoor side environment temperature as the judgment standard outer ring temperature.
It should be noted that, for the place where the air conditioner 10 is installed, the geographical location is fixed, and the climate condition of the geographical location is basically the same every year, therefore, the temperature value with the longest occurrence time is marked in the first usage period to obtain the judgment standard outer ring temperature (indicated by G1), so that the situation that the outdoor side ambient temperature is the judgment standard outer ring temperature can be more easily occurred in the period after the first usage period, and the judgment of the heat exchange efficiency of the heat exchanger 130 is easier to be performed.
In the substep S130, a first operating condition of the air conditioner 10 during the first usage time period and in the cooling mode is obtained, and a first heat exchanger inlet refrigerant temperature and a first heat exchanger outlet refrigerant temperature of the heat exchanger 130 are obtained.
In this embodiment, the first operating condition may include a standard outer ring temperature G1, a first fan speed (indicated by H1), and a first heat exchanger outlet refrigerant flow rate (indicated by D1). The first heat exchanger outlet refrigerant flow D1 is detected by the flow meter 150. In the sub-step S130, a first heat exchanger inlet refrigerant temperature E1 and a first heat exchanger outlet refrigerant temperature F1 of the heat exchanger 130 when the air conditioner 10 performs the cooling operation in the first usage time period and at the judgment standard outer loop temperature G1 are obtained. When the air conditioner 10 operates in the cooling mode within the first usage period, in the case that the outdoor side ambient temperature G is the judgment standard outer ring temperature G1, the judgment standard outer ring temperature G1 is recorded, and the first fan rotation speed H1 of the fan of the air conditioner 10, the first heat exchanger outlet refrigerant flow D1 of the heat exchanger 130, and the first heat exchanger inlet refrigerant temperature E1 and the first heat exchanger outlet refrigerant temperature F1 of the heat exchanger 130 during the cooling operation under the judgment standard outer ring temperature G1 are recorded for use in the judgment of the heat exchange efficiency of the heat exchanger 130.
It should be noted that, in other embodiments of the present invention, the corresponding data of the air conditioner 10 during the cooling operation may not be recorded under the standard outer ring temperature, but the first fan rotation speed of the air conditioner 10 during the cooling operation, the first heat exchanger outlet refrigerant flow rate of the heat exchanger 130, and the first heat exchanger inlet refrigerant temperature and the first heat exchanger outlet refrigerant temperature of the heat exchanger 130 may be recorded under any outdoor side ambient temperature, and may also be used for determining the heat exchange efficiency of the heat exchanger 130.
Referring to fig. 3, in step S200, the temperature of the refrigerant at the inlet of the second heat exchanger and the temperature of the refrigerant at the outlet of the second heat exchanger of the heat exchanger 130 in the second usage time period and in the cooling mode are obtained to obtain the temperature difference of the refrigerant at the inlet and the outlet of the second heat exchanger.
In this embodiment, in step S200, the second usage time period may be set according to actual needs, for example, the second year after the air conditioner 10 is installed and used, or the third year after the air conditioner 10 is installed and used, and so on, or a period of time after the first usage time period after the air conditioner 10 is installed and used.
The second heat exchanger inlet refrigerant temperature (indicated by E2) is detected by the first temperature sensor 131, and the second heat exchanger outlet refrigerant temperature (indicated by F2) is detected by the second temperature sensor 132. The temperature difference of the inlet and outlet refrigerants of the second heat exchanger is the difference value of the outlet refrigerant temperature F2 minus the inlet refrigerant temperature E2 of the second heat exchanger. The change of the temperature difference of the inlet and outlet refrigerants of the second heat exchanger relative to the temperature difference of the inlet and outlet refrigerants of the first heat exchanger can be directly obtained by subtracting the difference value of the temperature difference of the inlet and outlet refrigerants of the first heat exchanger from the temperature difference of the inlet and outlet refrigerants of the second heat exchanger; the temperature of the refrigerant at the inlet of the second heat exchanger can be controlled to be the same as that of the refrigerant at the inlet of the first heat exchanger, the temperature of the refrigerant at the outlet of the second heat exchanger can be obtained, and the side surface reflection can be realized through the difference value between the temperature of the refrigerant at the outlet of the second heat exchanger and that of the refrigerant at the outlet of the first heat exchanger; or the temperature of the refrigerant at the outlet of the second heat exchanger is controlled to be the same as that of the refrigerant at the outlet of the first heat exchanger, and the temperature of the refrigerant at the inlet of the second heat exchanger is reflected laterally by the difference value between the temperature of the refrigerant at the inlet of the second heat exchanger and that of the refrigerant at the inlet of the first heat exchanger. In this embodiment, the temperature of the refrigerant at the inlet of the second heat exchanger is controlled to be the same as the temperature of the refrigerant at the inlet of the first heat exchanger, the temperature of the refrigerant at the outlet of the second heat exchanger is obtained, and the change of the temperature difference between the refrigerant at the inlet and the refrigerant at the outlet of the heat exchanger is reflected laterally by the difference between the temperature of the refrigerant at the outlet of the second heat exchanger and the temperature of the refrigerant at the outlet of the first heat.
Referring to fig. 5, in order to more accurately detect the heat exchange efficiency of the heat exchanger 130, the step S200 may include the following sub-steps S210-S230.
And a substep S210 of controlling the air conditioner 10 to operate under a second operating condition identical to the first operating condition in the cooling mode for a second period of use time.
Therefore, the second working condition of the air conditioner 10 in the second use time period can be ensured to be the same as the first working condition of the air conditioner 10 in the first use time period, so that the influence on the detection of the heat exchange efficiency of the heat exchanger 130 due to different working conditions is prevented, and the detection of the heat exchange efficiency is more accurate.
In this embodiment, the second operating condition may include an actual outer ring temperature G2, a second fan speed H2, and a second heat exchanger outlet refrigerant flow D2. In the sub-step S210, the air conditioner 10 is controlled to operate in the cooling mode for the second period of time until the actual outer ring temperature G2 reaches the judgment standard outer ring temperature G1. Alternatively, the air conditioner 10 may operate in the cooling mode during the second period of use when the actual outer ring temperature G2 first reaches the determination standard outer ring temperature G1. And controlling the air conditioner 10 to work in the cooling mode in the second use time period, so that the second fan rotating speed H2 of the fan of the air conditioner 10 is equal to the first fan rotating speed H1, and the second heat exchanger outlet refrigerant flow rate D2 is equal to the first heat exchanger outlet refrigerant flow rate D1, that is, D2 is equal to D1. It should be understood that, in the second usage period of time, in the cooling mode, when the actual outer ring temperature G2 first reaches the judgment standard outer ring temperature G1, since the second fan speed H2 is controlled to be kept constant at the first fan speed H1, the second heat exchanger outlet refrigerant flow D2 is made equal to the first heat exchanger outlet refrigerant flow D1 by adjusting the frequency of the compressor 100 and the opening degree of the internal electronic expansion valve 170.
Further, in the step of controlling the air conditioner 10 to operate in the cooling mode in the second usage period of time, so that the flow rate of the refrigerant exiting from the second heat exchanger is equal to the flow rate of the refrigerant exiting from the first heat exchanger, the flow rate D2 of the refrigerant exiting from the second heat exchanger is adjusted in the following manner:
(1) if the second heat exchanger outlet refrigerant flow rate D2 is less than the first heat exchanger outlet refrigerant flow rate D1, i.e., if D2 < D1, the opening degree of the indoor unit electronic expansion valve 170 of the air conditioner 10 is increased. Alternatively, the opening degree of the indoor unit electronic expansion valve 170 may be raised by, for example, 1 step/s.
(2) If the outlet refrigerant flow rate of the second heat exchanger is greater than the outlet refrigerant flow rate of the first heat exchanger, i.e., if D2 is greater than D1, the opening degree of the electronic expansion valve 170 in the indoor unit of the air conditioner 10 is decreased. Alternatively, the opening degree of the indoor unit electronic expansion valve 170 may be decreased by, for example, 1 step/2 s.
(3) If the second heat exchanger outlet refrigerant flow rate is equal to the first heat exchanger outlet refrigerant flow rate, that is, if D2 is equal to D1, the opening degree of the internal electronic expansion valve 170 of the air conditioner 10 is maintained.
In the substep S220, the air conditioner 10 is controlled to operate in the cooling mode in the second usage time period, so that the temperature of the refrigerant at the inlet of the second heat exchanger of the heat exchanger 130 is equal to the temperature of the refrigerant at the inlet of the first heat exchanger.
In this embodiment, the air conditioner 10 is controlled to operate in the second usage time period and in the cooling mode until the actual outer ring temperature G2 reaches the judgment standard outer ring temperature G1, so that the second heat exchanger inlet refrigerant temperature E2 of the heat exchanger 130 is equal to the first heat exchanger inlet refrigerant temperature E1 by adjusting the frequency of the compressor 100 and controlling the opening degree of the electronic expansion valve, that is, E2 is equal to E1.
Further, in the sub-step S220, the inlet refrigerant temperature E2 of the second heat exchanger is adjusted as follows:
if the second heat exchanger inlet refrigerant temperature E2 is lower than the first heat exchanger inlet refrigerant temperature E1, that is, when E2 is less than E1, the opening degree of the electronic expansion valve 170 in the internal unit of the air conditioner 10 is controlled to maintain the initial opening degree, and the operating frequency of the compressor 100 of the air conditioner 10 is increased. Alternatively, the opening degree of the indoor unit electronic expansion valve 170 is maintained at 100 steps, and the operation frequency of the compressor 100 may be raised by, for example, 1Hz/3 s.
Secondly, if the temperature of the refrigerant at the inlet of the second heat exchanger E2 is higher than the temperature of the refrigerant at the inlet of the first heat exchanger E1, namely when E2 is higher than E1, the opening degree of the electronic expansion valve 170 of the inner machine of the air conditioner 10 is controlled to keep the initial opening degree, and the operation frequency of the compressor 100 of the air conditioner 10 is reduced. Alternatively, the opening degree of the indoor unit electronic expansion valve 170 is maintained at 100 steps, and the operation frequency of the compressor 100 may be decreased by, for example, 1Hz/3 s.
And thirdly, if the second heat exchanger inlet refrigerant temperature E2 is equal to the first heat exchanger inlet refrigerant temperature E1, that is, when E2 is equal to E1, controlling the opening degree of the electronic expansion valve 170 in the indoor unit of the air conditioner 10 to maintain the initial opening degree, and controlling the operation frequency of the compressor 100 to maintain unchanged.
And a substep S230 of obtaining the temperature of the outlet refrigerant of the second heat exchanger.
In this embodiment, the second heat exchanger outlet refrigerant temperature F2 is detected by the second temperature sensor 132. In a second usage time period, in the refrigeration mode, when the actual outer ring temperature G2 first reaches the judgment standard outer ring temperature G1, the air conditioner 10 controls the second fan rotation speed H2 to be kept unchanged at the first fan rotation speed H1, so that the second heat exchanger outlet refrigerant flow D2 is equal to the first heat exchanger outlet refrigerant flow D1, and the second heat exchanger inlet refrigerant temperature E2 is equal to the first heat exchanger inlet refrigerant temperature E1, at this time, the second heat exchanger outlet refrigerant temperature F2 is detected. When the second heat exchanger outlet refrigerant temperature F2 is detected, the heat exchanger outlet refrigerant temperature is continuously detected within a period of time, for example, 15min, for example, every 5s, and an average value of a plurality of detection values is calculated, so that the second heat exchanger outlet refrigerant temperature F2 is obtained. This can improve the accuracy of detection.
Referring to fig. 3, in step S300, if the difference between the inlet-outlet refrigerant temperatures of the second heat exchanger is greater than the difference between the inlet-outlet refrigerant temperatures of the first heat exchanger, it is determined that the heat exchange efficiency of the heat exchanger 130 in the second usage period is attenuated relative to the heat exchange efficiency of the heat exchanger 130 in the first usage period.
It should be noted that, if the above-mentioned method a is adopted, the temperature difference of the refrigerant at the inlet and the outlet of the second heat exchanger and the temperature difference of the refrigerant at the inlet and the outlet of the first heat exchanger are respectively calculated, and the temperature difference of the refrigerant at the inlet and the outlet of the second heat exchanger is compared with the temperature difference of the refrigerant at the inlet and the outlet of the first heat exchanger. If the temperature difference of the refrigerant at the inlet and the outlet of the second heat exchanger is larger, it is determined that the heat exchange efficiency of the heat exchanger 130 is attenuated in the second use period. Or, if a difference obtained by subtracting the refrigerant temperature difference between the inlet and outlet of the first heat exchanger from the refrigerant temperature difference between the inlet and outlet of the second heat exchanger is greater than a preset value, and the preset value is greater than 0 ℃, it is determined that the heat exchange efficiency of the heat exchanger 130 is attenuated in the second usage time period.
Referring to fig. 6, in the embodiment, in the above-mentioned manner B, since the air conditioner 10 is controlled to operate in the cooling mode in the second usage period, so that the second heat exchanger inlet refrigerant temperature E2 of the heat exchanger 130 is equal to the first heat exchanger inlet refrigerant temperature E1, the step S300 may include the following sub-steps.
And a substep S310 of determining whether a difference between the outlet refrigerant temperature of the second heat exchanger and the outlet refrigerant temperature of the first heat exchanger is greater than or equal to a preset difference.
Wherein the preset difference is greater than or equal to 0 ℃. In order to make the judgment of the heat exchange efficiency of the heat exchanger 130 more accurate, in this embodiment, the preset difference is set to be 2-4 degrees centigrade, and further may be 3 degrees centigrade. In this embodiment, it is determined whether F2-F1 ≧ 3 is satisfied.
In the substep S320, if the difference between the outlet refrigerant temperature of the second heat exchanger and the outlet refrigerant temperature of the first heat exchanger is greater than or equal to the preset difference, it is determined that the heat exchange efficiency of the heat exchanger 130 in the second usage period is attenuated relative to the heat exchange efficiency of the heat exchanger 130 in the first usage period.
In this embodiment, that is, if it is determined that F2-F1 is greater than or equal to 3, it is determined that the heat exchange efficiency of the heat exchanger 130 in the second usage period is attenuated. At this time, the controller 20 may control the alarm device to send an alarm signal to remind the user that the heat exchange efficiency of the heat exchanger 130 is attenuated, which may be a situation that the heat exchanger 130 is clogged or has a reverse sheet to reduce the heat exchange efficiency, so that the user can process the heat exchanger 130 to improve the heat exchange efficiency of the heat exchanger 130.
In addition, in another embodiment of the present invention, if the above-mentioned method C is adopted, the air conditioner 10 is controlled, for example, the frequency of the compressor 100 and the opening degree of the internal electronic expansion valve 170 are controlled, so that the second heat exchanger outlet refrigerant temperature F2 is equal to the first heat exchanger outlet refrigerant temperature F1, in step S300, the magnitudes of the second heat exchanger inlet refrigerant temperature E2 and the first heat exchanger inlet refrigerant temperature E1 are compared, and if the difference between the first heat exchanger inlet refrigerant temperature E1 and the second heat exchanger inlet refrigerant temperature E2 is greater than the preset difference, it is determined that the heat exchange efficiency of the heat exchanger 130 in the second usage period is attenuated relative to the heat exchange efficiency of the heat exchanger 130 in the first usage period.
The method for detecting the attenuation of the heat exchange efficiency of the heat exchanger of the air conditioner provided by the embodiment of the invention judges whether the heat exchange efficiency of the heat exchanger 130 is attenuated or not through the temperature of the inlet/outlet refrigerant of the heat exchanger 130 of the air conditioner outdoor unit in the air conditioner 10, so that the effective monitoring of the heat exchange efficiency of the heat exchanger 130 is realized, and when the attenuation of the heat exchange efficiency of the heat exchanger 130 is monitored, a signal is only sent to remind a user, so that the user can conveniently process the conditions of dirty blockage, inverted sheets and the like of the heat exchanger 130, which reduce the heat exchange efficiency, and the heat exchange efficiency of the heat exchanger 130 is ensured.
Referring to fig. 7, in order to execute possible steps of the heat exchanger heat exchange efficiency attenuation detection method of the air conditioner according to the embodiments, an embodiment of the present invention provides a heat exchanger heat exchange efficiency attenuation detection apparatus 200 of an air conditioner, which is applied to an air conditioner 10 and is used for executing the heat exchanger heat exchange efficiency attenuation detection method of the air conditioner. It should be noted that the basic principle and the generated technical effect of the heat exchanger heat exchange efficiency attenuation detecting device 200 of the air conditioner provided by the embodiment of the present invention are substantially the same as those of the above embodiment, and for the sake of brief description, for parts not mentioned in this embodiment, reference may be made to the corresponding contents in the above embodiment.
The apparatus 200 for detecting heat exchanger heat exchange efficiency degradation of an air conditioner may include a first obtaining module 210, a second obtaining module 220, and a determining module 230.
The first obtaining module 210 is configured to obtain a first heat exchanger inlet refrigerant temperature and a first heat exchanger outlet refrigerant temperature of the heat exchanger 130 of the outdoor unit of the air conditioner 10 in the first usage time period and in the cooling mode, so as to obtain a first heat exchanger inlet/outlet refrigerant temperature difference.
Optionally, the first obtaining module 210 may be specifically configured to execute the step S100 and the sub-steps thereof in the above-mentioned figures, so as to achieve the corresponding technical effect.
The second obtaining module 220 is configured to obtain a second heat exchanger inlet refrigerant temperature and a second heat exchanger outlet refrigerant temperature of the heat exchanger 130 in the second usage time period and in the cooling mode of the air conditioner 10, so as to obtain a second heat exchanger inlet/outlet refrigerant temperature difference.
Optionally, the second obtaining module 220 may be specifically configured to execute the step S200 and the sub-steps thereof in the above-mentioned figures, so as to achieve the corresponding technical effect.
The determining module 230 is configured to determine that the heat exchange efficiency of the heat exchanger 130 in the second usage time period is attenuated relative to the heat exchange efficiency of the heat exchanger 130 in the first usage time period if the temperature difference between the inlet/outlet refrigerants of the second heat exchanger is greater than the temperature difference between the inlet/outlet refrigerants of the first heat exchanger.
Optionally, the determining module 230 may be specifically configured to execute the step S300 and the sub-steps thereof in the above-mentioned figures, so as to achieve the corresponding technical effect.
In summary, according to the heat exchanger heat exchange efficiency attenuation detection method of the air conditioner, the heat exchanger heat exchange efficiency attenuation detection device 200 of the air conditioner and the air conditioner 10 provided by the embodiments of the present invention, whether the heat exchange efficiency of the heat exchanger 130 is attenuated or not is determined by the temperature of the refrigerant at the inlet and the outlet of the heat exchanger 130 of the air conditioner 10, so as to effectively monitor the heat exchange efficiency of the heat exchanger 130, when the heat exchange efficiency of the heat exchanger 130 is monitored to be attenuated, a signal is only required to be sent to remind a user, so that the user can handle the situations of heat exchange efficiency reduction, such as filth blockage and inversion, occurring in the heat exchanger 130, and thus the heat exchange efficiency of the heat exchanger 130 is ensured.
In the embodiments provided in the present application, it should be understood that the disclosed apparatus and method can be implemented in other ways. The apparatus embodiments described above are merely illustrative, and for example, the flowchart and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of apparatus, methods and computer program products according to various embodiments of the present invention. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). It should also be noted that, in some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware-based systems which perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.
In addition, the functional modules in the embodiments of the present invention may be integrated together to form an independent part, or each module may exist separately, or two or more modules may be integrated to form an independent part.
The functions, if implemented in the form of software functional modules and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.

Claims (10)

1. A heat exchanger heat exchange efficiency attenuation detection method of an air conditioner is characterized by comprising the following steps:
acquiring a first heat exchanger inlet refrigerant temperature and a first heat exchanger outlet refrigerant temperature of a heat exchanger (130) of an air conditioner outdoor unit in a refrigeration mode within a first use time period of the air conditioner (10) to obtain a first heat exchanger inlet and outlet refrigerant temperature difference, wherein the first heat exchanger inlet and outlet refrigerant temperature difference is a difference value obtained by subtracting the first heat exchanger inlet refrigerant temperature from the first heat exchanger outlet refrigerant temperature;
acquiring a second heat exchanger inlet refrigerant temperature and a second heat exchanger outlet refrigerant temperature of the heat exchanger (130) of the air conditioner (10) in a second use time period and in a refrigeration mode to obtain a second heat exchanger inlet and outlet refrigerant temperature difference, wherein the second heat exchanger inlet and outlet refrigerant temperature difference is a difference value obtained by subtracting the second heat exchanger inlet refrigerant temperature from the second heat exchanger outlet refrigerant temperature;
if the temperature difference of the inlet and outlet refrigerants of the second heat exchanger is larger than the temperature difference of the inlet and outlet refrigerants of the first heat exchanger, determining that the heat exchange efficiency of the heat exchanger (130) in the second use time period is attenuated relative to the heat exchange efficiency of the heat exchanger (130) in the first use time period;
the step of obtaining the temperature of the inlet refrigerant of the second heat exchanger and the temperature of the outlet refrigerant of the second heat exchanger of the heat exchanger (130) in the second use time period and in the refrigeration mode of the air conditioner (10) to obtain the temperature difference of the inlet refrigerant and the outlet refrigerant of the second heat exchanger comprises the following steps:
controlling the air conditioner (10) to work in a cooling mode within a second use time period, so that the temperature of a second heat exchanger inlet refrigerant of the heat exchanger (130) is equal to that of the first heat exchanger inlet refrigerant;
acquiring the temperature of the refrigerant at the outlet of the second heat exchanger;
if the difference between the inlet and outlet refrigerant temperatures of the second heat exchanger is greater than the difference between the inlet and outlet refrigerant temperatures of the first heat exchanger, the step of determining that the heat exchange efficiency of the heat exchanger (130) in the second use period is attenuated relative to the heat exchange efficiency of the heat exchanger (130) in the first use period comprises the following steps:
and if the difference value between the second heat exchanger outlet refrigerant temperature and the first heat exchanger outlet refrigerant temperature is greater than or equal to a preset difference value, determining that the heat exchange efficiency of the heat exchanger (130) in the second service time period is attenuated relative to the heat exchange efficiency of the heat exchanger (130) in the first service time period.
2. The method for detecting the attenuation of the heat exchange efficiency of the heat exchanger of the air conditioner as claimed in claim 1, wherein the step of controlling the air conditioner (10) to operate in the cooling mode in the second period of use so that the temperature of the refrigerant at the inlet of the second heat exchanger of the heat exchanger (130) is equal to the temperature of the refrigerant at the inlet of the first heat exchanger comprises:
if the temperature of the refrigerant at the inlet of the second heat exchanger is lower than that of the refrigerant at the inlet of the first heat exchanger, controlling the opening degree of an electronic expansion valve (170) of an inner machine of the air conditioner (10) to keep an initial opening degree, and increasing the operating frequency of a compressor (100) of the air conditioner (10);
if the temperature of the refrigerant at the inlet of the second heat exchanger is higher than that of the refrigerant at the inlet of the first heat exchanger, controlling the opening degree of an electronic expansion valve (170) of an inner machine of the air conditioner (10) to keep the initial opening degree, and reducing the operating frequency of the compressor (100);
and if the temperature of the refrigerant at the inlet of the second heat exchanger is equal to the temperature of the refrigerant at the inlet of the first heat exchanger, controlling the opening degree of an electronic expansion valve (170) of an inner machine of the air conditioner (10) to keep an initial opening degree, and controlling the running frequency of the compressor (100) to keep unchanged.
3. The method for detecting the attenuation of the heat exchange efficiency of the heat exchanger of the air conditioner as claimed in claim 1, wherein the step of obtaining the first heat exchanger inlet refrigerant temperature and the first heat exchanger outlet refrigerant temperature of the heat exchanger (130) of the outdoor unit of the air conditioner (10) in the first usage period and in the cooling mode to obtain the first heat exchanger inlet/outlet refrigerant temperature difference comprises:
acquiring a first working condition of the air conditioner (10) working in a first use time period and in a refrigeration mode, and the inlet refrigerant temperature and the outlet refrigerant temperature of the first heat exchanger of the heat exchanger (130);
before the step of controlling the air conditioner (10) to work in a cooling mode within a second usage period of time so that the temperature of the refrigerant at the inlet of the second heat exchanger of the heat exchanger (130) is equal to the temperature of the refrigerant at the inlet of the first heat exchanger, the method further includes:
controlling the air conditioner (10) to operate in a cooling mode and in the second period of use under a second operating condition that is the same as the first operating condition.
4. The method for detecting the attenuation of the heat exchange efficiency of the heat exchanger of the air conditioner as claimed in claim 3, wherein the first operating condition includes a judgment standard outer loop temperature, and the second operating condition includes an actual outer loop temperature;
the step of controlling the air conditioner (10) to operate under a second operating condition, which is the same as the first operating condition, during the second period of use and in a cooling mode includes:
and controlling the air conditioner (10) to work in the second use time period and in the refrigeration mode until the actual outer ring temperature reaches the judgment standard outer ring temperature.
5. The method for detecting the attenuation of the heat exchange efficiency of the heat exchanger of the air conditioner as claimed in claim 4, wherein the step of obtaining the first heat exchanger inlet refrigerant temperature and the first heat exchanger outlet refrigerant temperature of the heat exchanger (130) of the outdoor unit of the air conditioner (10) in the first usage period and in the cooling mode to obtain the first heat exchanger inlet/outlet refrigerant temperature difference further comprises:
acquiring the outdoor ambient temperature of the air conditioner (10) in the first use time period and in a refrigeration mode;
marking the temperature value with the longest occurrence time in the outdoor side environment temperature as the judgment standard outer ring temperature;
the step of obtaining a first operating condition of the air conditioner (10) during a first period of use and in a cooling mode, and the first heat exchanger inlet refrigerant temperature and the first heat exchanger outlet refrigerant temperature of the heat exchanger (130) includes:
and acquiring the inlet refrigerant temperature of the first heat exchanger and the outlet refrigerant temperature of the first heat exchanger of the heat exchanger (130) when the air conditioner (10) performs refrigeration work within a first service time period and under the judgment standard outer ring temperature.
6. The method for detecting the attenuation of the heat exchange efficiency of the heat exchanger of the air conditioner as claimed in claim 3, wherein the first operating condition includes a first fan speed; the second working condition comprises a second fan speed;
the step of controlling the air conditioner (10) to operate under a second operating condition, which is the same as the first operating condition, during the second period of use and in a cooling mode includes:
and controlling the air conditioner (10) to work in the second use time period and in a refrigeration mode, so that the second fan rotating speed is equal to the first fan rotating speed.
7. The method for detecting the heat exchange efficiency attenuation of the heat exchanger of the air conditioner as claimed in claim 3, wherein the first working condition includes a first heat exchanger outlet refrigerant flow rate; the second working condition comprises the outlet refrigerant flow of the second heat exchanger;
the step of controlling the air conditioner (10) to operate under a second operating condition, which is the same as the first operating condition, during the second period of use and in a cooling mode includes:
and controlling the air conditioner (10) to work in the second use time period and in the refrigeration mode, so that the flow of the refrigerant at the outlet of the second heat exchanger is equal to the flow of the refrigerant at the outlet of the first heat exchanger.
8. The method for detecting the attenuation of the heat exchange efficiency of the heat exchanger of the air conditioner as claimed in claim 7, wherein the step of controlling the air conditioner (10) to operate in the cooling mode during the second period of use so that the flow rate of the refrigerant at the outlet of the second heat exchanger is equal to the flow rate of the refrigerant at the outlet of the first heat exchanger comprises:
if the outlet refrigerant flow of the second heat exchanger is smaller than the outlet refrigerant flow of the first heat exchanger, the opening degree of an internal electronic expansion valve (170) of the air conditioner (10) is increased;
if the outlet refrigerant flow of the second heat exchanger is larger than that of the first heat exchanger, the opening degree of an internal electronic expansion valve (170) of the air conditioner (10) is reduced;
and if the outlet refrigerant flow of the second heat exchanger is equal to the outlet refrigerant flow of the first heat exchanger, keeping the opening degree of an internal electronic expansion valve (170) of the air conditioner (10) unchanged.
9. The utility model provides a heat exchanger heat exchange efficiency decay detection device of air conditioner which characterized in that includes:
the first obtaining module (210) is used for obtaining a first heat exchanger inlet refrigerant temperature and a first heat exchanger outlet refrigerant temperature of a heat exchanger (130) of an air conditioner outdoor unit in a first use time period and in a refrigeration mode of the air conditioner (10) so as to obtain a first heat exchanger inlet and outlet refrigerant temperature difference, wherein the first heat exchanger inlet and outlet refrigerant temperature difference is a difference value obtained by subtracting the first heat exchanger inlet refrigerant temperature from the first heat exchanger outlet refrigerant temperature;
the second obtaining module (220) is used for obtaining a second heat exchanger inlet refrigerant temperature and a second heat exchanger outlet refrigerant temperature of the heat exchanger (130) in a second use time period and in a refrigeration mode of the air conditioner (10) so as to obtain a second heat exchanger inlet and outlet refrigerant temperature difference, wherein the second heat exchanger inlet and outlet refrigerant temperature difference is a difference value obtained by subtracting the second heat exchanger inlet refrigerant temperature from the second heat exchanger outlet refrigerant temperature;
a determining module (230) configured to determine that, if the difference between the inlet/outlet refrigerant temperatures of the second heat exchanger is greater than the difference between the inlet/outlet refrigerant temperatures of the first heat exchanger, the heat exchange efficiency of the heat exchanger (130) in the second usage period is attenuated relative to the heat exchange efficiency of the heat exchanger (130) in the first usage period;
the second obtaining module (220) is further configured to control the air conditioner (10) to operate in a cooling mode within a second usage time period, so that a second heat exchanger inlet refrigerant temperature of the heat exchanger (130) is equal to the first heat exchanger inlet refrigerant temperature, and to obtain a second heat exchanger outlet refrigerant temperature;
the determining module (230) is further configured to determine that, if a difference between the second heat exchanger outlet refrigerant temperature and the first heat exchanger outlet refrigerant temperature is greater than or equal to a preset difference, the heat exchange efficiency of the heat exchanger (130) in the second usage period is attenuated relative to the heat exchange efficiency of the heat exchanger (130) in the first usage period.
10. An air conditioner, characterized by comprising a controller (20), wherein the controller (20) is used for executing computer instructions to realize the heat exchanger heat exchange efficiency attenuation detection method of the air conditioner according to any one of claims 1-8.
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