CN113175734B - Method for calculating capacity energy efficiency of air conditioner, computer storage medium and air conditioner - Google Patents

Method for calculating capacity energy efficiency of air conditioner, computer storage medium and air conditioner Download PDF

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CN113175734B
CN113175734B CN202110429718.2A CN202110429718A CN113175734B CN 113175734 B CN113175734 B CN 113175734B CN 202110429718 A CN202110429718 A CN 202110429718A CN 113175734 B CN113175734 B CN 113175734B
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compressor
temperature
heat exchanger
air conditioner
capacity
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CN113175734A (en
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刘睿
潘京大
李学良
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Hisense Air Conditioning Co Ltd
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Hisense Air Conditioning 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
    • F24F11/50—Control or safety arrangements characterised by user interfaces or communication
    • F24F11/54—Control or safety arrangements characterised by user interfaces or communication using one central controller connected to several sub-controllers
    • 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
    • F24F11/72—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure
    • F24F11/74—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure for controlling air flow rate or air velocity
    • F24F11/77—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure for controlling air flow rate or air velocity by controlling the speed of ventilators
    • 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
    • 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
    • F24F11/87—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling absorption or discharge of heat in outdoor units
    • F24F11/871—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling absorption or discharge of heat in outdoor units by controlling outdoor fans
    • 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
    • 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
    • F24F2140/10—Pressure
    • F24F2140/12—Heat-exchange fluid pressure
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
    • Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating

Abstract

The invention discloses a method for calculating the energy efficiency of the capacity of an air conditioner, a computer storage medium and the air conditioner, wherein the method comprises the following steps: obtaining the frequency of a compressor and the exhaust pressure of the compressor, and obtaining the temperature of an indoor heat exchanger, the temperature of an outdoor heat exchanger, the suction temperature of the compressor and the exhaust temperature of the compressor; determining the current operation condition of the air conditioner; obtaining a supercooling enthalpy value and a compressor suction pressure according to the temperature of the indoor heat exchanger, the temperature of the outdoor heat exchanger and the compressor discharge pressure; obtaining a compressor suction enthalpy value according to the compressor suction temperature and the compressor suction pressure, and obtaining a compressor discharge enthalpy value according to the compressor discharge temperature and the compressor discharge pressure; obtaining a refrigerant flow value according to the compressor frequency, the compressor suction pressure, the compressor discharge pressure, the compressor suction temperature and the compressor characteristic parameters; and obtaining the refrigerating capacity/heating capacity of the air conditioner under the current operation working condition according to the refrigerant flow value, the air suction enthalpy value of the compressor, the exhaust enthalpy value of the compressor and the supercooling enthalpy value.

Description

Method for calculating capacity energy efficiency of air conditioner, computer storage medium and air conditioner
Technical Field
The invention relates to the technical field of air conditioners, in particular to a method for calculating the energy efficiency of the air conditioner, a computer storage medium and an air conditioner.
Background
For the test of the capacity and the energy efficiency of the air conditioner, the test is usually carried out in an enthalpy difference laboratory, and the power consumption of the air conditioner in the enthalpy difference laboratory can be obtained by directly utilizing a power meter connected with the air conditioner. In an enthalpy difference laboratory, the capacity of an air conditioner is usually tested by adopting an air side enthalpy difference method and a refrigerant side enthalpy difference method, wherein the air side enthalpy difference method is used for testing the temperature of an air inlet dry-wet bulb of an indoor unit by utilizing an air volume chamber, and the air volume calculating capacity is multiplied by the change of the air enthalpy difference. The refrigerant side enthalpy difference method is less applied than the air side enthalpy difference method, a temperature sensor and a pressure sensor are arranged at an inlet of a refrigerant pipe of an indoor unit, a flow sensor is arranged at an outlet of a compressor, the enthalpy value of the refrigerant at an inlet and an outlet of a heat exchanger is obtained according to a table lookup of the pressure and the temperature, the enthalpy difference is calculated, and the enthalpy difference is multiplied by the flow measured by the flow sensor to calculate the capacity of the refrigerant.
The method comprises the steps of calculating the operation capacity of the air conditioner by adopting a refrigerant side enthalpy difference, generally obtaining a refrigerant flow value by adopting a scheme of arranging a flow sensor or a compressor enthalpy difference method scheme, fitting the enthalpy values of the refrigerant at an inlet and an outlet of a heat exchanger by using different temperature measuring points when the compressor enthalpy difference method scheme is adopted, and obtaining the power of a compressor by subtracting estimated heat dissipation amounts to the environment and refrigerant oil from the power of the compressor obtained by monitoring. The temperature of the refrigerant can be directly tested by using a temperature sensor, a certain functional relation exists between the pressure and the temperature, and the functional relation is determined by the physical property of the refrigerant, so that the enthalpy value state of the refrigerant side can be obtained through fitting correction of temperature points.
However, without the enthalpy difference laboratory test conditions, the capacity and energy efficiency of the air conditioner cannot be directly tested by the two methods. Moreover, the refrigerant flow value in the air conditioner is a relatively independent parameter with respect to temperature and pressure, and cannot be obtained by using temperature point fitting, if a flow sensor is directly arranged to measure the refrigerant flow value, the cost is high, and the volume of the flow sensor is large, so that the measurement is difficult to realize on a product.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art. Therefore, one of the purposes of the invention is to provide a method for calculating the energy efficiency of the capacity of the air conditioner, which is independent of enthalpy difference laboratory test conditions, has low cost and is easy to realize on products.
The second objective of the present invention is to provide an air conditioner.
It is a further object of the present invention to provide a computer storage medium.
The fourth objective of the present invention is to provide an air conditioner.
In order to solve the above problem, a method for calculating energy efficiency of air conditioner according to an embodiment of the first aspect of the present invention includes: obtaining the frequency of a compressor and the discharge pressure of the compressor, and obtaining the temperature of an indoor heat exchanger, the temperature of an outdoor heat exchanger, the suction temperature of the compressor and the discharge temperature of the compressor; determining the current operation condition of the air conditioner; obtaining a supercooling enthalpy value and a compressor suction pressure according to the temperature of the indoor heat exchanger, the temperature of the outdoor heat exchanger and the compressor discharge pressure; obtaining a compressor suction enthalpy value according to the compressor suction temperature and the compressor suction pressure, and obtaining a compressor discharge enthalpy value according to the compressor discharge temperature and the compressor discharge pressure; obtaining a refrigerant flow value according to the compressor frequency, the compressor suction pressure, the compressor discharge pressure, the compressor suction temperature and the compressor characteristic parameters; and obtaining the refrigerating capacity/heating capacity of the air conditioner under the current operation working condition according to the refrigerant flow value, the compressor air suction enthalpy value, the compressor exhaust enthalpy value and the supercooling enthalpy value.
According to the method for calculating the capacity and the energy efficiency of the air conditioner, the suction pressure of the compressor under the current operation condition is obtained according to the temperature of the indoor heat exchanger, the temperature of the outdoor heat exchanger and the discharge pressure of the compressor, the flow value of the refrigerant is further obtained according to the frequency of the compressor, the discharge pressure of the compressor, the suction temperature of the compressor and the characteristic parameters of the compressor, no additional test equipment such as a flow sensor is needed, no temperature sensor is needed to be arranged in the heat exchanger, the cost is saved, and the production and the later maintenance are facilitated. And when the air conditioner operates under different working conditions, inquiring the refrigerant physical property table according to the temperature value and the pressure value to obtain the enthalpy value of each state point, and obtaining the refrigerating capacity/heating capacity of the air conditioner according to the obtained refrigerant flow value and the enthalpy value of each state point, namely determining the capacity of the air conditioner in the actual operation state.
In some embodiments of the invention, obtaining an indoor heat exchanger temperature, an outdoor heat exchanger temperature, a compressor suction temperature, and a compressor discharge temperature comprises: acquiring the detection temperature of a first sensor at one end of the indoor heat exchanger, the detection temperature of a second sensor at one end of the outdoor heat exchanger, the detection temperature of a third sensor at an air suction port of the compressor and the detection temperature of a fourth sensor at an air exhaust port of the compressor, and acquiring indoor environment temperature and outdoor environment temperature; correcting the first sensor detection temperature as a function of the indoor ambient temperature and the compressor frequency to obtain the indoor heat exchanger temperature, and correcting the second sensor detection temperature as a function of the outdoor ambient temperature and the compressor frequency to obtain the outdoor heat exchanger temperature, and correcting the third sensor detection temperature as a function of the outdoor ambient temperature and the compressor frequency to obtain the compressor suction temperature, and correcting the fourth sensor detection temperature as a function of the outdoor ambient temperature and the compressor frequency to obtain the compressor discharge temperature.
In some embodiments of the invention, the indoor heat exchanger temperature is obtained by the following equation: t is61＝d1×T60+d2×Ta1；d1＝1-d2；d2＝FrA/1000; wherein, T61Is the temperature, T, of the indoor heat exchanger60Detecting a temperature, T, for said first sensora1Is the indoor ambient temperature, FrIs the compressor frequency; obtaining the outdoor heat exchanger temperature or the compressor suction temperature or the compressor discharge temperature by the following equation: t is a unit ofi1＝d1×Ti0+d2×Ta2；d1＝1-d2；d2＝FrA/1000; wherein, Ti1＝T51Is the temperature, T, of the outdoor heat exchangeri0＝T50Detecting temperature, or T, for said second sensori1＝T31For the compressor suction temperature, Ti0＝T30Detecting temperature, or, T, for said third sensori1＝T41Is the compressor discharge temperature, Ti0＝T40Detecting a temperature for the fourth sensor; wherein, Ta2Is the outdoor ambient temperature, FrIs the compressor frequency.
In some embodiments of the present invention, under a refrigeration condition or a heating condition of the air conditioner, obtaining a refrigerant flow value according to the compressor frequency, the compressor suction pressure, the compressor discharge pressure, the compressor suction temperature, and a compressor characteristic parameter, includes: acquiring a compressor characteristic parameter, wherein the compressor characteristic parameter comprises a fixed volume of a compressor; obtaining the specific heat capacity of a refrigerant flowing through the air suction port of the compressor according to the air suction pressure and the air suction temperature of the compressor; and obtaining the refrigerant flow value according to the compressor frequency, the compressor suction pressure, the compressor discharge pressure, the compressor fixed volume and the specific heat capacity.
In some embodiments of the present invention, obtaining the refrigerant flow value according to the compressor frequency, the compressor suction pressure, the compressor discharge pressure, the compressor fixed volume and the specific heat capacity includes: calculating the refrigerant flow value by the following formula:
Figure BDA0003030920590000031
Figure BDA0003030920590000032
wherein q ismC0, c1, c2, c3 and c4 are all fitting coefficients for the refrigerant flow value, PeFor the suction pressure of said compressor, PcFor the compressor discharge pressure, FrFor the compressor frequency, V is the compressor fixedVolume, VsIs the specific heat capacity.
In some embodiments of the present invention, in a cooling operation mode of the air conditioner, obtaining a supercooling enthalpy value and a compressor suction pressure according to the indoor heat exchanger temperature, the outdoor heat exchanger temperature and the compressor discharge pressure comprises: inquiring a refrigerant physical property table according to the temperature of the outdoor heat exchanger and the discharge pressure of the compressor to obtain a supercooling enthalpy value of the outdoor heat exchanger; obtaining the supercooling enthalpy value of the indoor heat exchanger according to the supercooling enthalpy value of the outdoor heat exchanger; and inquiring a refrigerant physical property table according to the supercooling enthalpy value of the indoor heat exchanger and the temperature of the indoor heat exchanger to obtain the suction pressure of the compressor under the refrigeration working condition.
In some embodiments of the present invention, in a refrigeration working condition of the air conditioner, obtaining a refrigeration capacity/heating capacity of the air conditioner in the current operation working condition according to the refrigerant flow value, the compressor suction enthalpy value, the compressor discharge enthalpy value, and the supercooling enthalpy value, includes: the cooling capacity is obtained by the following formula: qRefrigerating capacity＝qm×(H3-H5) (ii) a Wherein Q isRefrigerating capacityFor said refrigerating capacity, qmIs the refrigerant flow value, H3For the suction enthalpy value of said compressor, H5The supercooling enthalpy value of the outdoor heat exchanger.
In some embodiments of the present invention, in a heating operation mode of the air conditioner, obtaining a supercooling enthalpy value and a compressor suction pressure according to the indoor heat exchanger temperature, the outdoor heat exchanger temperature and the compressor discharge pressure comprises: inquiring a refrigerant physical property table according to the temperature of the indoor heat exchanger and the exhaust pressure of the compressor to obtain a supercooling enthalpy value of the indoor heat exchanger; obtaining the supercooling enthalpy value of the outdoor heat exchanger according to the supercooling enthalpy value of the indoor heat exchanger; and inquiring a refrigerant physical property table according to the supercooling enthalpy value of the indoor heat exchanger and the temperature of the indoor heat exchanger to obtain the suction pressure of the compressor under the heating working condition.
In some embodiments of the present invention, in a heating working condition of the air conditioner, the refrigerant flow value, the suction enthalpy value of the compressor, and the exhaust enthalpy value of the compressor are used as the basisThe enthalpy value and the supercooling enthalpy value obtain the refrigerating capacity/heating capacity of the air conditioner under the current operation working condition, and the method comprises the following steps: the heating amount is obtained by the following formula: qHeating capacity＝qm×(H4-H6) (ii) a Wherein Q isHeating capacityFor said amount of heating, qmIs the refrigerant flow rate, H4Is the compressor discharge enthalpy value, H6And the supercooling enthalpy value of the indoor heat exchanger.
In some embodiments of the invention, the method further comprises: acquiring the power consumption of the air conditioner; and obtaining the energy efficiency value of the air conditioner according to the refrigerating capacity/heating capacity of the air conditioner and the power consumption.
In order to solve the above problem, an air conditioner according to an embodiment of a second aspect of the present invention includes: at least one processor; a memory communicatively coupled to at least one of the processors; the storage is stored with a computer program executable by at least one processor, and the at least one processor implements the method for calculating the energy efficiency of the air conditioner capacity according to any one of the above embodiments when executing the computer program.
According to the air conditioner disclosed by the embodiment of the invention, when the processor executes the computer program in the memory, the method for calculating the capacity and the energy efficiency of the air conditioner is realized, the capacity and the energy efficiency of the air conditioner can be obtained without depending on enthalpy difference laboratory test conditions, additional test equipment is not needed, and the cost is saved.
In order to solve the above problem, the computer storage medium of the third aspect of the present invention has a computer program stored thereon, and the computer program, when executed by a processor, implements the method for calculating the energy efficiency of the air conditioner according to any one of the above embodiments.
According to the computer storage medium of the embodiment of the invention, the computer program is stored on the computer storage medium, and when the computer program is executed, the method for calculating the energy efficiency of the air conditioner capacity of the embodiment can be realized, the calculation of the energy efficiency of the air conditioner capacity is supported, and the cost is low.
In order to solve the above problem, an air conditioner according to a fourth aspect of the present invention includes: the compressor, the indoor heat exchanger, the outdoor heat exchanger and the throttling element; the pressure sensor is used for collecting the exhaust pressure of the compressor; the first temperature sensor is arranged at one end of the indoor heat exchanger; the second temperature sensor is arranged at one end of the outdoor heat exchanger; a third temperature sensor provided at an air suction port of the compressor; a fourth temperature sensor arranged at an exhaust port of the compressor; and the controller is respectively connected with the pressure sensor, the first temperature sensor, the second temperature sensor, the third temperature sensor and the fourth temperature sensor and is used for executing the method for calculating the capacity energy efficiency of the air conditioner.
According to the air conditioner of the embodiment of the invention, based on the controller and the pressure sensor, the first temperature sensor, the second temperature sensor, the third temperature sensor and the fourth temperature sensor, the controller executes the method for calculating the energy efficiency of the air conditioner capacity of the above embodiment, the refrigerant flow can be obtained according to the discharge pressure of the compressor, the relevant parameters of the compressor and the temperature acquired by the temperature sensor, no additional test equipment is needed, the cost is low, and the enthalpy difference laboratory test condition is not depended on, the refrigerating capacity/heating capacity of the air conditioner is obtained according to the obtained refrigerant flow value and the enthalpy value of each state point, the capacity of the air conditioner in the actual running state is determined, data support can be provided for a user to know the running state of the air conditioner in time, the air conditioner can be matched more favorably with the running load of the current environment, and the energy saving degree and the comfort degree of the air conditioner are improved.
In some embodiments of the present invention, the air conditioner further comprises: the fifth temperature sensor is connected with the controller and used for collecting the indoor environment temperature; the sixth temperature sensor is connected with the controller and used for collecting the outdoor environment temperature; the controller is also used for correcting the temperature detected by the sensor according to the indoor environment temperature and the outdoor environment temperature.
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 flow chart of a method for calculating energy efficiency of air conditioner capacity according to an embodiment of the present invention;
FIG. 2 is a flowchart of a method for calculating energy efficiency of air conditioner capacity according to another embodiment of the present invention;
FIG. 3 is a flowchart of a method for calculating energy efficiency of air conditioner capacity according to still another embodiment of the present invention;
FIG. 4 is a flowchart of a method for calculating energy efficiency of air conditioner capacity according to still another embodiment of the present invention;
FIG. 5 is a flowchart of a method for calculating energy efficiency of air conditioner capacity according to still another embodiment of the present invention;
fig. 6 is a block diagram of an air conditioner according to an embodiment of the present invention;
fig. 7 is a schematic view illustrating a refrigerant circulation system of an air conditioner according to an embodiment of the present invention.
Reference numerals:
an air conditioner 10;
a processor 1, a memory 2;
the air conditioner includes a compressor 100, an indoor heat exchanger 200, an outdoor heat exchanger 300, a throttle element 400, a pressure sensor 500, a four-way valve N, a first temperature sensor N1, a second temperature sensor N2, a third temperature sensor N3, and a fourth temperature sensor N4.
Detailed Description
Embodiments of the present invention will be described in detail below, the embodiments described with reference to the drawings being illustrative, and the embodiments of the present invention will be described in detail below.
In order to solve the problem that a user cannot know the actual operation capacity of the air conditioner at home, the embodiment of the invention provides a method for calculating the capacity energy efficiency of the air conditioner and the air conditioner adopting the method.
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present application without making any creative effort belong to the protection scope of the present application.
The air conditioner performs a cooling/heating cycle of the air conditioner by using a compressor, a condenser (outdoor heat exchanger), an expansion valve, and an evaporator (indoor heat exchanger) in the present application. Wherein the refrigeration cycle includes a series of processes involving compression, condensation, expansion, and evaporation, and supplies a refrigerant to the air that has been conditioned and heat-exchanged.
The compressor compresses a refrigerant gas in a high-temperature and high-pressure state and discharges the compressed refrigerant gas. The discharged refrigerant gas flows into the condenser. The condenser condenses the compressed refrigerant into a liquid phase, and the heat is released to the surrounding environment through the condensation process.
The expansion valve expands the high-temperature and high-pressure liquid-phase refrigerant condensed in the condenser into a low-pressure liquid-phase refrigerant. The evaporator evaporates the refrigerant expanded in the expansion valve and returns the refrigerant gas in a low-temperature and low-pressure state to the compressor. The evaporator can achieve a cooling effect by heat exchange with a material to be cooled using latent heat of evaporation of a refrigerant. The air conditioner can adjust the temperature of the indoor space throughout the cycle.
The outdoor unit of the air conditioner refers to a portion of a refrigeration cycle including a compressor and an outdoor heat exchanger, the indoor unit of the air conditioner includes an indoor heat exchanger, and an expansion valve may be provided in the indoor unit or the outdoor unit.
The indoor heat exchanger and the outdoor heat exchanger serve as a condenser or an evaporator. When the indoor heat exchanger is used as a condenser, the air conditioner is used as a heater in a heating mode, and when the indoor heat exchanger is used as an evaporator, the air conditioner is used as a cooler in a cooling mode.
An air conditioner according to some embodiments of the present application includes an air conditioner indoor unit installed in an indoor space. The indoor unit, i.e., the indoor unit, is connected to an outdoor unit, i.e., the outdoor unit, installed in an outdoor space, through a pipe. The outdoor unit of the air conditioner may be provided with a compressor, an outdoor heat exchanger, an outdoor fan, an expander, and the like for a refrigeration cycle, and the indoor unit of the air conditioner may be provided with an indoor heat exchanger and an indoor fan.
A method of calculating the energy efficiency of the air conditioner according to an embodiment of the present invention will be described with reference to fig. 1 to 5. Note that, the step numbers in the present application, such as S1, S2 … S5, S6, and the like, are only for convenience of describing the present solution, and are not to be construed as limiting the order of the steps. That is, for example, the execution order of steps S1, S2 … S5, and S6 may be specifically determined according to actual requirements, and is not limited to the control in the order of S1 to S6.
Fig. 1 is a flowchart of a method of calculating an energy efficiency of an air conditioner according to an embodiment of the present invention.
In some embodiments of the present invention, as shown in FIG. 1, the method for calculating the energy efficiency of the air conditioner capacity at least includes steps S1-S6, which are described as follows.
And S1, acquiring the frequency of the compressor and the discharge pressure of the compressor, and acquiring the temperature of the indoor heat exchanger, the temperature of the outdoor heat exchanger, the suction temperature of the compressor and the discharge temperature of the compressor.
The temperature sensor can be used for acquiring the temperature of the indoor heat exchanger, the temperature of the outdoor heat exchanger, the suction temperature of the compressor and the exhaust temperature of the compressor. For example, temperature sensors are provided in the middle of the outdoor heat exchanger and the middle of the indoor heat exchanger, or one temperature sensor is provided in each of one end of the indoor heat exchanger and one end of the outdoor heat exchanger to collect the temperature of one end of the indoor heat exchanger and the temperature of one end of the outdoor heat exchanger, and for example, one temperature sensor is provided in each of the suction port and the discharge port of the compressor to collect the temperature of the suction port of the compressor and the temperature of the discharge port of the compressor. Furthermore, because the temperature points are arranged outside the coil pipe of the heat exchanger, and the temperature values acquired by the temperature sensors are the comprehensive temperature of the combined action of the temperature of the refrigerant inside the coil pipe and the ambient temperature, the temperature values acquired by the temperature sensors of the monitoring temperature points can be corrected based on the relevant parameters influencing the detected temperature so as to obtain the temperature of the indoor heat exchanger, the temperature of the outdoor heat exchanger, the suction temperature of the compressor and the exhaust temperature of the compressor.
Each temperature sensor transmits the collected temperature data to a controller of the air conditioner, such as a controller of an indoor unit or a controller of an outdoor unit, or a separately provided controller, which is not particularly limited herein.
In the exemplary embodiment, the compressor discharge pressure is designated, for example, as PcThe pressure at the exhaust port of the compressor is acquired by arranging a pressure sensor at the exhaust port of the compressorcAnd collecting the compressor discharge pressure PcTo a controller such as a controller of an indoor unit or a controller of an outdoor unit or a separately provided controller, etc. The controller of the air conditioner can also directly monitor and read the frequency of the compressor as FrFor example, the compressor frequency FrThe reading can be directly monitored by an electric control board of the outdoor unit.
And S2, determining the current operation condition of the air conditioner.
In an embodiment, the operation condition of the air conditioner may include a cooling condition and a heating condition, and the refrigerant cycle process of the cooling condition or the heating condition may be described with reference to the above cooling cycle or the heating cycle. After the air conditioner is started, the current operation condition of the air conditioner is judged, the current operation condition is obtained, and step S3 is executed.
In a specific embodiment, the current operating condition of the air conditioner may be determined manually by a user, or may be a default operating condition when the air conditioner is turned on. For example, when the user starts the air conditioner, the user manually selects the required operation conditions, such as a refrigeration condition and a heating condition, according to the actual requirements; or, when the user starts the air conditioner, the user does not receive the operation condition required by the selection, at this time, the air conditioner selects the default operation condition, and the default operation condition is the preset or last operation condition recorded by the air conditioner, namely the default operation condition, such as a refrigeration condition or a heating condition, after the air conditioner is started.
And S3, obtaining the supercooling enthalpy value and the compressor suction pressure according to the indoor heat exchanger temperature, the outdoor heat exchanger temperature and the compressor discharge pressure.
In the embodiment, in the differenceUnder the operation condition, the temperature of the indoor heat exchanger and the discharge pressure of the compressor can be set to be P for example in a mode of fitting correction of the temperature pointscOr, depending on the outdoor heat exchanger temperature and the compressor discharge pressure PcAnd querying a refrigerant physical property table to obtain the corresponding supercooling enthalpy value under the current operation condition, wherein the refrigerant physical property table is a data table of physical property parameters of the refrigerant under different conditions, and the physical property parameters of the refrigerant may include temperature, pressure, density, enthalpy value, specific heat capacity and the like.
Wherein the compressor suction pressure is, for example, denoted by PeThe pressure refers to the pressure at the suction port of the compressor.
In the embodiment of the invention, the high-pressure side pressure of the compressor, namely the discharge pressure P of the compressor is acquired by a pressure sensorcAfter obtaining the corresponding supercooling enthalpy value under the current operating condition, as the front and back enthalpy values of the refrigerant passing through the throttling element are not changed, namely the supercooling enthalpy value corresponding to the temperature of the indoor heat exchanger and the supercooling enthalpy value corresponding to the temperature of the outdoor heat exchanger, the suction pressure P of the compressor can be obtained by inquiring the refrigerant physical property table according to the supercooling enthalpy value corresponding to the current operating condition and the temperature of the indoor heat exchanger or the temperature of the outdoor heat exchangereAnd an additional pressure sensor is not required to be arranged at the air suction port of the compressor, so that the cost is saved, and the production and later-stage maintenance are facilitated.
And S4, obtaining the compressor suction enthalpy value according to the compressor suction temperature and the compressor suction pressure, and obtaining the compressor discharge enthalpy value according to the compressor discharge temperature and the compressor discharge pressure.
In particular, the compressor suction temperature and the compressor suction pressure P may be determined byeInquiring the physical property table of the refrigerant to obtain the suction enthalpy value of the compressor as H3And, from the compressor discharge temperature and the compressor discharge pressure PcInquiring the physical property table of the refrigerant to obtain the exhaust enthalpy value of the compressor as H4。
And S5, obtaining the refrigerant flow value according to the compressor frequency, the compressor suction pressure, the compressor discharge pressure, the compressor suction temperature and the compressor characteristic parameters.
In the embodiment of the invention, the refrigerant flow is obtained by considering the characteristic parameters of the compressor, such as the fixed volume of the compressor, the characteristic parameters of the compressor are inherent parameters of the compressor, the characteristic parameters of the compressor can not change due to different operation conditions in actual operation, and can be pre-stored in a controller of the air conditioner and directly called when the refrigerant flow value is calculated. The compressor frequency can be read directly by the controller for monitoring.
In the embodiment of the invention, the pressure sensor is used for acquiring the exhaust pressure of the compressor and obtaining the suction pressure of the compressor based on the temperature values of the state points, and the refrigerant flow value can be obtained by combining the frequency of the compressor, the characteristic parameters of the compressor and the suction temperature of the compressor, so that additional flow test equipment is not required, the cost is low, and the method is easy to realize on air conditioner products.
Specifically, under a cooling working condition or a heating working condition, on the basis of obtaining the suction pressure of the compressor according to the temperature of the outdoor heat exchanger or the temperature of the indoor heat exchanger and the discharge pressure of the compressor, obtaining the characteristic parameters of the compressor, such as the fixed volume of the compressor, and obtaining the specific heat capacity of the refrigerant flowing through the suction port of the compressor according to the suction pressure of the compressor and the suction temperature of the compressor, for example, obtaining the specific heat capacity of the refrigerant flowing through the suction port of the compressor by inquiring a refrigerant physical property table according to the suction pressure of the compressor and the suction temperature of the compressor; and obtaining a refrigerant flow value according to the compressor frequency, the compressor suction pressure, the compressor discharge pressure, the compressor fixed capacity and the specific heat capacity, for example, substituting all parameters into a fitting formula to obtain the refrigerant flow value under the current operation condition, for example, marking as qm。
Therefore, under the condition that the enthalpy difference testing capability is not available, the refrigerant flow value q can be obtained by only extracting the temperature values, the compressor frequency and the compressor exhaust pressure at different positions and through the steps S2-S5mThe air conditioner has the advantages that the testing equipment for increasing the flow of the refrigerant is not needed, the air conditioner can be directly applied to the air conditioner conveniently, and the purpose of calculating the actual operation capacity and energy efficiency of the air conditioner at home of a user is achieved conveniently.
And S6, obtaining the refrigerating capacity/heating capacity of the air conditioner under the current operating condition according to the refrigerant flow value, the compressor air suction enthalpy value, the compressor air discharge enthalpy value and the supercooling enthalpy value.
The refrigerating capacity refers to the sum of heat removed from a closed space, a room or an area in unit time when the air conditioner performs refrigerating operation. The heating quantity is the sum of the heating values provided by the air conditioner in unit time when the air conditioner operates in heating. The refrigerating capacity of the air conditioner is evaluated by calculating the refrigerating capacity of the air conditioner under the current operation working condition, the refrigerating capacity is larger when the refrigerating capacity is larger, and the heating capacity of the air conditioner is evaluated by calculating the heating capacity of the air conditioner under the current operation working condition, and the heating capacity is larger when the heating capacity is larger.
In the embodiment, the enthalpy difference is calculated according to the current operation condition of the air conditioner by the enthalpy state parameter of the refrigerant side, for example, under the refrigeration condition, the enthalpy difference is calculated by the enthalpy parameter of the refrigerant at the inlet and the outlet of the outdoor heat exchanger, for example, recorded as delta H1Enthalpy difference is compressor suction enthalpy value H3Supercooling enthalpy value H of inlet and outlet of outdoor heat exchanger5A difference of (i.e. Δ H)1＝H3-H5(ii) a Under the heating condition, the enthalpy difference is calculated by the enthalpy parameter of the refrigerant at the inlet and the outlet of the indoor heat exchanger and is recorded as delta H2Enthalpy difference is compressor exhaust enthalpy value H4Supercooling enthalpy value H of inlet and outlet of indoor heat exchanger6A difference of (i.e. Δ H)2＝H4-H6. Then, the enthalpy difference and the refrigerant flow rate value q calculated under the current operation working condition are calculatedmMultiplying, and the calculation result is the refrigerating capacity/heating capacity of the air conditioner.
For example, under the cooling condition of the air conditioner, the cooling capacity is obtained by the following formula (1-1):
Qrefrigerating capacity＝qm×(H3-H5) (ii) a Formula (1-1)
Wherein Q isRefrigerating capacityTo the refrigerating capacity, qmIs the flow rate of refrigerant, H3Is the suction enthalpy value, H, of the compressor5The supercooling enthalpy value of the outdoor heat exchanger.
Or, under the heating working condition of the air conditioner, the heating quantity is obtained through the following formula (1-2):
Qheating capacity＝qm×(H4-H6) (ii) a Formula (1-2)
Wherein Q isHeating capacityTo produce heat quantity, qmIs the flow rate of refrigerant, H4Is the compressor discharge enthalpy, H6The supercooling enthalpy value of the indoor heat exchanger.
Furthermore, the capacity of the air conditioner in the current running state is obtained according to the refrigerating capacity/heating capacity, so that the air conditioner can be matched with the running load more in line with the environment according to the capacity of the air conditioner, and the energy saving degree and the comfort degree are improved.
According to the method for calculating the capacity and the energy efficiency of the air conditioner, the suction pressure of the compressor under the current operation condition is obtained according to the temperature of the indoor heat exchanger, the temperature of the outdoor heat exchanger and the discharge pressure of the compressor, the flow value of the refrigerant is further obtained according to the frequency of the compressor, the discharge pressure of the compressor, the suction temperature of the compressor and the characteristic parameters of the compressor, no additional test equipment such as a flow sensor is needed, no temperature sensor is needed to be arranged in the heat exchanger, the cost is saved, and the production and the later maintenance are facilitated. And when the air conditioner operates under different working conditions, inquiring the refrigerant physical property table according to the temperature value and the pressure value to obtain the enthalpy value of each state point, and obtaining the refrigerating capacity/heating capacity of the air conditioner according to the obtained refrigerant flow value and the enthalpy value of each state point, namely determining the capacity of the air conditioner in the actual operation state.
In some embodiments of the present invention, as shown in fig. 2, there is a flowchart of a method for calculating energy efficiency of air conditioner capacity according to another embodiment of the present invention, wherein more accurate temperature information can be obtained by correcting the temperature collected by the sensor, that is, the above step S1: obtaining the indoor heat exchanger temperature, the outdoor heat exchanger temperature, the compressor suction temperature, and the compressor discharge temperature may include steps S11 and S12, as follows.
S11, acquiring a temperature detected by a first sensor at one end of the indoor heat exchanger, a temperature detected by a second sensor at one end of the outdoor heat exchanger, a temperature detected by a third sensor at an air suction port of the compressor, and a temperature detected by a fourth sensor at an air discharge port of the compressor, and acquiring an indoor ambient temperature and an outdoor ambient temperature.
In the embodiment, a first temperature sensor is arranged at one end of an indoor heat exchanger, a second temperature sensor is arranged at one end of an outdoor heat exchanger, a third temperature sensor is arranged at an air suction port of a compressor and used for collecting the temperature at the air suction port of the compressor, and a fourth temperature sensor is arranged at an air exhaust port of the compressor and used for collecting the temperature at the air exhaust port of the compressor.
Because the temperature sensor is arranged outside the coil pipe of the heat exchanger or outside the connecting pipeline of the compressor, the temperature detected by the sensor is the combined temperature of the refrigerant inside the pipeline and the ambient temperature, and if the temperature detected by the sensor is directly used for calculating the flow rate of the refrigerant and the refrigerating capacity/heating capacity, certain errors exist. In order to further improve the accuracy of detecting the temperature of the refrigerant, in the embodiment of the invention, the indoor ambient temperature and the outdoor ambient temperature can be detected through the indoor temperature sensor and the outdoor temperature sensor, and each temperature sensor sends the acquired temperature data to the controller of the air conditioner. The controller then corrects the temperature detected by the sensor based on the indoor and outdoor ambient temperatures and the compressor frequency, i.e., executes step S12.
S12, correcting the first sensor detection temperature according to the indoor ambient temperature and the compressor frequency to obtain an indoor heat exchanger temperature, correcting the second sensor detection temperature according to the outdoor ambient temperature and the compressor frequency to obtain an outdoor heat exchanger temperature, correcting the third sensor detection temperature according to the outdoor ambient temperature and the compressor frequency to obtain a compressor suction temperature, and correcting the fourth sensor detection temperature according to the outdoor ambient temperature and the compressor frequency to obtain a compressor discharge temperature.
Specifically, the indoor heat exchanger temperature is obtained by the following formulas (1-3), (1-4), and (1-5):
T61＝d1×T60+d2×Ta1(ii) a Formula (1-3)
d 1-1-d 2; formula (1-4)
d2＝FrA/1000; formula (1-5)
Wherein, T61Is the temperature, T, of the indoor heat exchanger60For the first sensor to detect the temperature, Ta1Is the indoor ambient temperature, FrFor compressor frequency, compressor frequency FrThe first sensor detects the temperature T60And indoor ambient temperature Ta1The detected temperature T of the first sensor is calculated according to the methods shown in the formulas (1-3) to (1-5)60Correcting to obtain more accurate indoor heat exchanger temperature T61And the calculation result is accurate.
The outdoor heat exchanger temperature or the compressor suction temperature or the compressor discharge temperature is obtained by the following equations (1-6), equations (1-7) and equations (1-8):
Ti1＝d1×Ti0+d2×Ta2(ii) a Formula (1-6)
d 1-1-d 2; formula (1-7)
d2＝FrA/1000; formula (1-8)
Wherein, Ti1＝T51Is the outdoor heat exchanger temperature, Ti0＝T50For the second sensor to detect temperature, or, Ti1＝T31Is the compressor suction temperature, Ti0＝T30For the third sensor to detect temperature, or, Ti1＝T41Is the compressor discharge temperature, Ti0＝T40Detect temperature for the fourth sensor, wherein Ta2Is the outdoor ambient temperature, FrIs the compressor frequency.
For example, the outdoor heat exchanger temperature T is calculated51While the second sensor detects the temperature T50Outdoor ambient temperature Ta2And compressor frequency FrThe temperature T detected by the second sensor is calculated in accordance with the methods shown in equations (1-6) to (1-8)50To carry out repairTo obtain more accurate temperature T of the outdoor heat exchanger51. As another example, the compressor suction temperature T is calculated31While the third sensor detects the temperature T30Outdoor ambient temperature Ta2And compressor frequency FrThe detected temperature T of the third sensor is calculated as shown in the formulas (1-6) to (1-8)30Correcting to obtain more accurate compressor suction temperature T31. As another example, the compressor discharge temperature T is calculated41While the fourth sensor detects the temperature T40Outdoor ambient temperature Ta2And compressor frequency FrThe temperature T detected by the fourth sensor is calculated in accordance with the methods shown in equations (1-6) to (1-8)40Correcting to obtain accurate compressor exhaust temperature T41。
The controller is used for correcting the temperature T of the indoor heat exchanger61Temperature T of outdoor heat exchanger51Compressor suction temperature T31And compressor discharge temperature T41The refrigerant flow value and the refrigerating capacity/heating capacity are calculated, a more accurate refrigerant flow value is provided, the air conditioner is more beneficial to matching the running load which is more accordant with the current environment, and the energy saving degree and the comfort degree of the air conditioner are improved.
Further, in the embodiment of the present invention, for obtaining the flow value, an additional test device is not required to be added, but the refrigerant flow value can be obtained based on the compressor characteristic parameter and the fitting formula, for example, the compressor characteristic parameter includes a compressor fixed volume related to the refrigerant capacity, an electronic control board of the outdoor unit can be set, the compressor frequency is monitored and read by the electronic control board, and the obtained compressor frequency, the compressor suction pressure, the compressor discharge pressure, the compressor fixed volume and the specific heat capacity are used as input parameters of the fitting formula, so that the refrigerant flow value can be obtained by calculation.
In some embodiments of the present invention, the refrigerant flow rate value may be obtained by calculating according to the following equation (1-9):
Figure BDA0003030920590000121
wherein q ismC0, c1, c2, c3 and c4 are all fitting coefficients of a refrigerant flow value, PeFor compressor suction pressure, PcCompressor discharge pressure, FrFor compressor frequency, V is compressor fixed volume, VsFor specific heat capacity, the fixed volume V of the compressor can be directly obtained in the factory specification of the air conditioner product and is prestored in a calculation program, wherein the fixed volume V can be obtained according to the suction pressure P of the compressoreAnd compressor suction temperature T31Obtaining the specific heat capacity V of the refrigerants. Frequency F of compressorrCompressor suction pressure PeCompressor discharge pressure PcCompressor fixed volume V and specific heat capacity VsAnd calculating according to the method shown in the formula (1-9) to obtain a more accurate refrigerant flow value without adding additional test equipment, so that the cost is saved.
The following describes the process of calculating the energy efficiency of the air conditioner under the cooling condition and the heating condition, respectively.
When the air conditioner is currently operated in a refrigeration working condition, under the working condition, a refrigerant circulation path is as follows: the air outlet of the compressor-the outdoor heat exchanger-the throttling element-the indoor heat exchanger-the air inlet of the compressor.
Under the refrigeration working condition, the high pressure and the low pressure of the compressor are determined, the exhaust pressure of the compressor is collected through the pressure sensor, the supercooling enthalpy value of the outdoor heat exchanger is obtained according to the temperature of the outdoor heat exchanger and the exhaust pressure of the compressor, and the suction pressure of the compressor is obtained according to the supercooling enthalpy value of the indoor heat exchanger and the temperature of the indoor heat exchanger.
Fig. 3 is a flowchart of a method of calculating energy efficiency of air conditioner capacity according to still another embodiment of the present invention. As shown in fig. 3, for compressor suction pressure PeAnd obtaining a supercooling enthalpy value and a compressor suction pressure according to the indoor heat exchanger temperature, the outdoor heat exchanger temperature and the compressor discharge pressure, comprising steps S31-S33, which are concretely as follows.
And S31, inquiring a refrigerant physical property table according to the temperature of the outdoor heat exchanger and the discharge pressure of the compressor to obtain the supercooling enthalpy value of the outdoor heat exchanger.
Under the refrigeration working condition, for the enthalpy value of each state point, specifically, by inquiring the refrigerant physical property table, the temperature T of the outdoor heat exchanger can be determined51And compressor discharge pressure PcObtaining the supercooling enthalpy value H of the outdoor heat exchanger5。
And S32, obtaining the supercooling enthalpy value of the indoor heat exchanger according to the supercooling enthalpy value of the outdoor heat exchanger.
Under the refrigeration working condition, because the front and back enthalpy values of the refrigerant passing through the throttling element are unchanged, namely the temperature T of the indoor heat exchanger61Corresponding indoor heat exchanger supercooling enthalpy value H6Equal to the corresponding supercooling enthalpy value H of the outdoor heat exchanger5。
And S33, inquiring a refrigerant physical property table according to the supercooling enthalpy value of the indoor heat exchanger and the temperature of the indoor heat exchanger to obtain the suction pressure of the compressor under the refrigeration working condition. By inquiring the physical property table of the refrigerant, the supercooling enthalpy value H of the indoor heat exchanger6And indoor heat exchanger temperature T61Obtaining compressor suction pressure Pe。
Under the refrigeration working condition, for the calculation of the flow value, the refrigerant flow value q of the air conditioner is generated according to the compressor frequency, the compressor characteristic parameter, the compressor discharge pressure and the obtained compressor suction pressuremFor example, the refrigerant flow rate value q can be obtained by substituting the parameters into the above formula (1-9)m. The characteristic parameters of the compressor are the fixed volume of the compressor, can be prestored in the controller and can be directly called when the flow value of the refrigerant is calculated.
Furthermore, the refrigerating capacity/heating capacity of the air conditioner is obtained according to the refrigerant flow value, the air suction enthalpy value of the compressor, the air exhaust enthalpy value of the compressor and the supercooling enthalpy value, and for example, the refrigerating capacity/heating capacity of the air conditioner can be obtained by substituting each parameter into the calculation formula (1-1) of the refrigerating capacity. Therefore, under the condition that enthalpy difference laboratory test conditions are not met, data support can be provided for a user to know the running state of the air conditioner in time, the air conditioner is more beneficial to matching the running load which is more accordant with the current environment, and the energy saving degree and the comfort level of the air conditioner are improved.
When the air conditioner is currently operated in a heating working condition, under the working condition, a circulation path of a refrigerant is as follows: the air outlet of the compressor-indoor heat exchanger-throttling element-outdoor heat exchanger-air suction inlet of the compressor.
Under the heating condition, the high pressure and the low pressure of the compressor are determined, the exhaust pressure of the compressor is acquired through the pressure sensor, the supercooling enthalpy value of the indoor heat exchanger can be obtained according to the temperature of the indoor heat exchanger and the exhaust pressure of the compressor, and the suction pressure of the compressor is obtained according to the supercooling enthalpy value of the outdoor heat exchanger and the temperature of the outdoor heat exchanger.
Fig. 4 is a flowchart of a method of calculating an energy efficiency of an air conditioner according to still another embodiment of the present invention. As shown in fig. 4, for compressor suction pressure PeAnd obtaining a supercooling enthalpy value and a compressor suction pressure according to the indoor heat exchanger temperature, the outdoor heat exchanger temperature and the compressor discharge pressure, comprising steps S34-S36, which are concretely as follows.
And S34, querying a refrigerant physical property table according to the temperature of the indoor heat exchanger and the discharge pressure of the compressor to obtain the supercooling enthalpy value of the indoor heat exchanger.
Under the heating condition, for the enthalpy value of each state point, specifically, by inquiring the refrigerant physical property table, the temperature T of the indoor heat exchanger can be determined61And compressor discharge pressure PcObtaining the supercooling enthalpy value H of the indoor heat exchanger6。
And S35, obtaining the supercooling enthalpy value of the outdoor heat exchanger according to the supercooling enthalpy value of the indoor heat exchanger.
Under the heating condition, because the front and back enthalpy values of the refrigerant passing through the throttling element are not changed, namely the temperature T of the outdoor heat exchanger51Corresponding supercooling enthalpy value H of outdoor heat exchanger5Equal to supercooling enthalpy value H of indoor heat exchanger6。
And S36, inquiring a refrigerant property table according to the supercooling enthalpy value of the indoor heat exchanger and the temperature of the indoor heat exchanger to obtain the suction pressure of the compressor under the heating working condition.
By inquiring the physical property table of the refrigerant, the supercooling enthalpy value H of the outdoor heat exchanger can be obtained5And outdoor heat exchanger temperature T51Obtaining compressor suction pressure Pe。
Under the heating working condition, for the calculation of the flow value, the refrigerant flow value q of the air conditioner is generated according to the compressor frequency, the compressor characteristic parameter, the compressor discharge pressure and the obtained compressor suction pressuremFor example, the refrigerant flow rate value q can be obtained by substituting the parameters into the above formula (1-9)m。
Furthermore, the cooling capacity/heating capacity of the air conditioner can be obtained according to the refrigerant flow value, the suction enthalpy value of the compressor, the exhaust enthalpy value of the compressor and the supercooling enthalpy value, for example, the heating capacity of the air conditioner can be obtained by substituting each parameter into the above calculation formula (1-1) of the cooling capacity. Therefore, under the condition that enthalpy difference laboratory test conditions are not met, data support can be provided for a user to know the running state of the air conditioner in time, the air conditioner is more beneficial to matching the running load which is more accordant with the current environment, and the energy saving degree and the comfort level of the air conditioner are improved.
In some embodiments of the present invention, as shown in fig. 5, a flowchart of a method for calculating energy efficiency of air conditioner capacity according to another embodiment of the present invention is provided, wherein the method for calculating energy efficiency of air conditioner capacity further includes steps S7 and S8, which are described as follows.
And S7, acquiring the power consumption of the air conditioner. Here, the power consumption of the air conditioner is represented by W.
And S8, obtaining the energy value of the air conditioner according to the cooling capacity, the heating capacity and the power consumption of the air conditioner.
In some embodiments of the present invention, under the cooling condition of the air conditioner, as shown in the formula (1-12), the cooling capacity Q of the air conditioner is adoptedRefrigerating capacityDividing by the power consumption W of the air conditioner to obtain an Energy Efficiency value EER (Energy Efficiency Ratio) of the air conditioner under the refrigeration condition, and adopting the heating capacity Q of the air conditioner under the heating condition of the air conditioner as shown in the formula (1-13)Heating capacityDividing the power consumption by the power consumption W Of the air conditioner to obtain the energy efficiency value COP (Coefficient Of Performance) Of the air conditioner under the heating working condition.
Figure BDA0003030920590000141
Figure BDA0003030920590000142
In summary, the method for calculating the capacity and energy efficiency of the air conditioner according to the embodiment of the present invention obtains the refrigerant flow value under the current operation condition based on the compressor frequency, the compressor discharge pressure, the compressor characteristic parameter, and the corrected temperature value of each state point, does not need to add additional test equipment, has low cost, is suitable for being applied to products, does not depend on enthalpy difference laboratory test adjustment, can obtain the capacity and energy efficiency of the air conditioner under the current operation condition through the compressor frequency and the temperature of each state point, and has a wide application range.
The method for calculating the energy efficiency of the air conditioner capacity of the above embodiment may be applied to an air conditioner product. An air conditioner according to an embodiment of the second aspect of the present invention will be described with reference to the accompanying drawings.
Fig. 6 is a block diagram of an air conditioner according to an embodiment of the present invention.
In some embodiments of the present invention, as shown in fig. 6, the air conditioner 10 includes at least one processor 1 and a memory 2, the memory 2 being communicatively coupled to the at least one processor 1.
The memory 2 stores therein a computer program executable by the at least one processor 1, and the at least one processor 1 implements the method for calculating the energy efficiency of the air conditioner according to any one of the above embodiments when executing the computer program.
According to the air conditioner 10 of the embodiment of the present invention, the memory 2 stores the computer program, when the air conditioner 10 is powered on, the processor 1 obtains the computer program in the memory 2 and executes the computer program, and the processor 1 can issue an instruction according to the running of the computer program to control the running state of each module in the air conditioner 10. When the air conditioner 10 operates under the refrigerating or heating working condition, the method for calculating the capacity and the energy efficiency of the air conditioner according to any one of the embodiments is applied to the air conditioner 10, the capacity of the air conditioner in the actual operation process can be obtained, the capacity and the energy efficiency of the air conditioner can be obtained without depending on enthalpy difference laboratory test conditions, additional test equipment is not needed, and the cost is saved.
In some embodiments of the present invention, a computer storage medium has stored thereon a computer program that, when executed by a processor, implements the method of calculating air conditioner capacity energy efficiency of any of the above embodiments.
According to the computer storage medium of the embodiment of the invention, the computer program is stored on the computer storage medium, when the computer program runs, the running parameters of each structure in the air conditioner can be obtained for analysis and calculation, so that the method for calculating the capacity and the energy efficiency of the air conditioner of the embodiment can be realized, the method can be directly applied to the existing air conditioner, no additional test equipment is needed, the cost is saved, and the capacity of the air conditioner in the actual running process can be directly obtained through calculation when the air conditioner runs under the refrigerating or heating working condition, so that the running mode is optimized in real time, the running of the air conditioner is more matched with the load of the environment, and the energy is saved and the air conditioner is more comfortable.
Fig. 7 is a schematic view illustrating a refrigerant circulation system of an air conditioner according to an embodiment of the present invention.
In some embodiments of the present invention, as shown in fig. 7, the air conditioner 10 includes a compressor 100, an indoor heat exchanger 200, an outdoor heat exchanger 300, a throttling element 400, a pressure sensor 500, a first temperature sensor N1, a second temperature sensor N2, a third temperature sensor N3, a fourth temperature sensor N4, and a controller (not shown).
The throttling element 400 is used to adjust the pressure of the refrigerant under the cooling condition or the heating condition of the air conditioner 10. A pressure sensor 500 is provided at the discharge of the compressor 100 for collecting the compressor discharge pressure.
The first temperature sensor N1 is disposed at one end of the indoor heat exchanger 200, and is configured to collect a temperature at one end of the indoor heat exchanger to obtain a first sensor detection temperature, and the corrected first sensor detection temperature may be used as the indoor heat exchanger temperature. The second temperature sensor N2 is disposed at one end of the outdoor heat exchanger 300, and is configured to collect a temperature at one end of the outdoor heat exchanger to obtain a second sensor detection temperature, and the corrected second sensor detection temperature may be used as the outdoor heat exchanger temperature. The third temperature sensor N3 is disposed at the air suction port of the compressor 100, and is configured to collect a temperature at the air suction port of the compressor 100 to obtain a detected temperature of the third sensor, and the corrected detected temperature of the third sensor may be used as the air suction temperature of the compressor. The fourth temperature sensor N4 is disposed at the discharge port of the compressor 100, and is configured to collect the temperature at the discharge port of the compressor 100 to obtain the temperature detected by the fourth sensor, and the corrected temperature detected by the second sensor may be used as the discharge temperature of the compressor.
The controller is connected to the pressure sensor 500, the first temperature sensor N1, the second temperature sensor N2, the third temperature sensor N3 and the fourth temperature sensor N4, respectively, for performing the method of calculating the energy efficiency of the air conditioner capacity of the above embodiment.
The controller obtains temperature information collected by the first temperature sensor N1, the second temperature sensor N2, the third temperature sensor N3 and the fourth temperature sensor N4, and further directly uses the obtained sensor temperatures for refrigerant flow calculation and cooling capacity/heating capacity calculation, and further corrects the temperatures of the respective sensors based on relevant parameters affecting the detected temperatures for calculation accuracy, and the corrected temperatures are used as the temperature of the indoor heat exchanger, the temperature of the outdoor heat exchanger, the suction temperature of the compressor and the discharge temperature of the compressor, and the method of the above embodiment is executed, so that the cooling capacity/heating capacity of the air conditioner 100 is obtained, and further, an effective value of the air conditioner under the current operation condition is obtained according to the cooling capacity/heating capacity and the power consumption. The refrigerating capacity/heating capacity and the energy efficiency value under the current operation working condition of the air conditioner can be displayed through the display panel, and a user can intuitively know the refrigerating capacity/heating capacity and the energy efficiency value without depending on enthalpy difference laboratory test conditions.
According to the air conditioner 10 of the embodiment of the invention, based on the controller and the pressure sensor 500, the first temperature sensor N1, the second temperature sensor N2, the third temperature sensor N3 and the fourth temperature sensor N4, the controller executes the method for calculating the capacity and energy efficiency of the air conditioner of the above embodiment, the refrigerant flow can be obtained according to the discharge pressure of the compressor, the related parameters of the compressor and the temperature collected by the temperature sensors, no additional test equipment is needed, the cost is low, and the enthalpy difference laboratory test condition is not depended on, the refrigerating capacity/heating capacity of the air conditioner 10 is obtained according to the obtained refrigerant flow value and the enthalpy value of each state point, namely the capacity of the air conditioner 10 in the actual operation state is determined, data support can be provided for users to know the operation state of the air conditioner 10 in time, and the air conditioner 10 is more beneficial to matching the operation load more in line with the current environment, the energy saving and comfort of the air conditioner 10 are improved.
In an embodiment, as shown in fig. 7, when the air conditioner 10 operates under different working conditions, the flow direction of the refrigerant in the system pipeline may be changed by the four-way valve N, so that the interconversion between the cooling and heating of the air conditioner 10 is realized. The solid arrow indicates the flow direction of the refrigerant in the system pipeline under the cooling condition of the air conditioner 10, and the dotted arrow indicates the flow direction of the refrigerant in the system pipeline under the heating condition of the air conditioner 10. As can be seen from fig. 7, when the air conditioner 10 operates in the cooling operating condition and the heating operating condition, the circulation directions of the refrigerant gas in the air conditioner 10 are different, and under the cooling operating condition of the air conditioner 10, the supercooling enthalpy value of the outdoor heat exchanger is obtained according to the temperature of the outdoor heat exchanger and the discharge pressure of the compressor, and under the heating operating condition of the air conditioner 10, the supercooling enthalpy value of the indoor heat exchanger is obtained according to the temperature of the indoor heat exchanger and the discharge pressure of the compressor, so as to implement the method for calculating the capacity and energy efficiency of the air conditioner according to any one of the above embodiments.
In some embodiments of the present invention, the air conditioner further comprises a fifth temperature sensor and a sixth temperature sensor. Wherein, fifth temperature sensor is connected with the controller for gather indoor ambient temperature, set up fifth temperature sensor indoor, the controller can revise first sensor detection temperature according to the indoor ambient temperature who gathers and compressor frequency, in order to obtain indoor heat exchanger temperature. The sixth temperature sensor is connected with the controller and used for collecting outdoor environment temperature, the sixth temperature sensor is arranged outdoors, and the temperature detected by the second sensor, the temperature detected by the third sensor and the temperature detected by the fourth sensor are corrected according to the collected outdoor sensor temperature and the collected compressor frequency so as to obtain more accurate outdoor heat exchanger temperature, compressor suction temperature and compressor exhaust temperature.
According to the air conditioner 10 of the embodiment of the invention, the controller is respectively connected with the pressure sensor 500, the first temperature sensor N1, the second temperature sensor N2, the third temperature sensor N3, the fourth temperature sensor N4, the fifth temperature sensor and the sixth temperature sensor, and the refrigerant flow calculation and the cooling amount/heating amount are obtained according to the temperature values acquired by the six temperature sensors and the pressure value detected by the pressure sensor 500, so that data reference can be provided for the current operation strategy of the air conditioner 10, the air conditioner 10 is favorably matched with the operation load more conforming to the current environment, and the energy saving degree and the comfort degree of the air conditioner 10 are improved.
The method for calculating the energy efficiency of the air conditioner capacity of the embodiment is applied to the air conditioner 10, no additional test equipment is needed, the cost is low, and the actual operation capacity energy efficiency of the air conditioner 10 can be obtained without depending on enthalpy difference laboratory test conditions, so that the method has important significance for obtaining the actual operation state of the air conditioner 10 and matching with the actual nominal capacity.
Other constructions and operations of the air conditioner 10 according to the embodiment of the present invention are known to those of ordinary skill in the art and will not be described in detail herein.
In the description of the present specification, reference to the description of "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like 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 present invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example.
While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims (11)

1. A method for calculating the energy efficiency of the capacity of an air conditioner is characterized by comprising the following steps:
obtaining the frequency of a compressor and the discharge pressure of the compressor, and obtaining the temperature of an indoor heat exchanger, the temperature of an outdoor heat exchanger, the suction temperature of the compressor and the discharge temperature of the compressor;
determining the current operation condition of the air conditioner;
obtaining a supercooling enthalpy value and a compressor suction pressure according to the indoor heat exchanger temperature, the outdoor heat exchanger temperature and the compressor discharge pressure, wherein under a refrigeration working condition of the air conditioner, the obtaining of the supercooling enthalpy value and the compressor suction pressure according to the indoor heat exchanger temperature, the outdoor heat exchanger temperature and the compressor discharge pressure comprises the following steps:
inquiring a refrigerant physical property table according to the temperature of the outdoor heat exchanger and the discharge pressure of the compressor to obtain a supercooling enthalpy value of the outdoor heat exchanger;
obtaining the supercooling enthalpy value of the indoor heat exchanger according to the supercooling enthalpy value of the outdoor heat exchanger;
inquiring a refrigerant physical property table according to the supercooling enthalpy value of the indoor heat exchanger and the temperature of the indoor heat exchanger to obtain the suction pressure of the compressor under the refrigeration working condition;
obtaining a compressor suction enthalpy value according to the compressor suction temperature and the compressor suction pressure, and obtaining a compressor discharge enthalpy value according to the compressor discharge temperature and the compressor discharge pressure;
obtaining a refrigerant flow value according to the compressor frequency, the compressor suction pressure, the compressor discharge pressure, the compressor suction temperature and the compressor characteristic parameter, wherein the step of obtaining the refrigerant flow value according to the compressor frequency, the compressor suction pressure, the compressor discharge pressure, the compressor suction temperature and the compressor characteristic parameter under a refrigeration working condition or a heating working condition of the air conditioner comprises the following steps:
acquiring a compressor characteristic parameter, wherein the compressor characteristic parameter comprises a fixed volume of a compressor;
obtaining the specific heat capacity of a refrigerant flowing through the air suction port of the compressor according to the air suction pressure and the air suction temperature of the compressor;
obtaining the refrigerant flow value according to the compressor frequency, the compressor suction pressure, the compressor discharge pressure, the compressor fixed volume and the specific heat capacity, wherein obtaining the refrigerant flow value according to the compressor frequency, the compressor suction pressure, the compressor discharge pressure, the compressor fixed volume and the specific heat capacity comprises:
calculating the refrigerant flow value by the following formula:
Figure FDA0003676734410000011
wherein q ismC0, c1, c2, c3 and c4 are all fitting coefficients for the refrigerant flow value, PeFor the suction pressure of the compressor, PCDischarge pressure of said compressor, FrFor the compressor frequency, V is the compressor fixed volume, VsIs the specific heat capacity;
and obtaining the refrigerating capacity/heating capacity of the air conditioner under the current operation working condition according to the refrigerant flow value, the compressor air suction enthalpy value, the compressor air discharge enthalpy value and the supercooling enthalpy value.
2. The method of calculating energy efficiency for air conditioner capacity according to claim 1, wherein obtaining an indoor heat exchanger temperature, an outdoor heat exchanger temperature, a compressor suction temperature, and a compressor discharge temperature comprises:
acquiring the detection temperature of a first sensor at one end of the indoor heat exchanger, the detection temperature of a second sensor at one end of the outdoor heat exchanger, the detection temperature of a third sensor at an air suction port of the compressor and the detection temperature of a fourth sensor at an air exhaust port of the compressor, and acquiring indoor environment temperature and outdoor environment temperature;
correcting the first sensor detection temperature as a function of the indoor ambient temperature and the compressor frequency to obtain the indoor heat exchanger temperature, and correcting the second sensor detection temperature as a function of the outdoor ambient temperature and the compressor frequency to obtain the outdoor heat exchanger temperature, and correcting the third sensor detection temperature as a function of the outdoor ambient temperature and the compressor frequency to obtain the compressor suction temperature, and correcting the fourth sensor detection temperature as a function of the outdoor ambient temperature and the compressor frequency to obtain the compressor discharge temperature.
3. The method of calculating air conditioner capacity energy efficiency according to claim 2,
obtaining the indoor heat exchanger temperature by the following formula:
T61＝d1×T60+d2×Ta1；
d1＝1-d2；
d2＝Fr/1000；
wherein, T61Is the temperature, T, of the indoor heat exchanger60Detecting a temperature, T, for said first sensora1Is the indoor ambient temperature, FrIs the compressor frequency;
obtaining the outdoor heat exchanger temperature or the compressor suction temperature or the compressor discharge temperature by the following equation:
Ti1＝d1×Ti0+d2×Ta2；
d1＝1-d2；
d2＝Fr/1000；
wherein, Ti1＝T51Is the temperature, T, of the outdoor heat exchangeri0＝T50Detecting temperature, or, T, for said second sensori1＝T31For the compressor suction temperature, Ti0＝T30Detecting temperature, or, T, for said third sensori1＝T41Is the compressor discharge temperature, Ti0＝T40Detecting a temperature for the fourth sensor;
wherein, Ta2Is the outdoor ambient temperature, FrIs the compressor frequency.
4. The method for calculating the energy efficiency of the air conditioner according to any one of claims 1 to 3, wherein under the refrigerating working condition of the air conditioner, the method for obtaining the refrigerating capacity/heating capacity of the air conditioner under the current operating working condition according to the refrigerant flow value, the compressor suction enthalpy value, the compressor discharge enthalpy value and the supercooling enthalpy value comprises the following steps:
the cooling capacity is obtained by the following formula:
Qrefrigerating capacity＝qm×(H3-H5)；
Wherein Q isRefrigerating capacityFor said cooling capacity, qmIs the refrigerant flow value, H3For the suction enthalpy value of said compressor, H5The supercooling enthalpy value of the outdoor heat exchanger.
5. The method for calculating the capacity energy efficiency of the air conditioner according to any one of claims 1 to 3, wherein the obtaining of the supercooling enthalpy value and the compressor suction pressure according to the indoor heat exchanger temperature, the outdoor heat exchanger temperature and the compressor discharge pressure in the heating working condition of the air conditioner comprises:
inquiring a refrigerant physical property table according to the temperature of the indoor heat exchanger and the exhaust pressure of the compressor to obtain a supercooling enthalpy value of the indoor heat exchanger;
obtaining the supercooling enthalpy value of the outdoor heat exchanger according to the supercooling enthalpy value of the indoor heat exchanger;
and inquiring a refrigerant physical property table according to the supercooling enthalpy value of the indoor heat exchanger and the temperature of the indoor heat exchanger to obtain the suction pressure of the compressor under the heating working condition.
6. The method for calculating the energy efficiency of the air conditioner according to claim 5, wherein in the heating working condition of the air conditioner, the method for obtaining the cooling capacity/heating capacity of the air conditioner in the current working condition according to the refrigerant flow value, the compressor suction enthalpy value, the compressor discharge enthalpy value and the supercooling enthalpy value comprises the following steps:
the heating amount is obtained by the following formula:
Qheating capacity＝qm×(H4-H6)；
Wherein Q isHeating capacityFor said amount of heating, qmIs the refrigerant flow rate, H4Is the compressor discharge enthalpy value, H6And the supercooling enthalpy value of the indoor heat exchanger.
7. The method of calculating energy efficiency for air conditioner capacity according to claim 1, characterized in that the method further comprises:
acquiring the power consumption of the air conditioner;
and obtaining the energy efficiency value of the air conditioner according to the refrigerating capacity/heating capacity of the air conditioner and the power consumption.
8. An air conditioner, comprising:
at least one processor;
a memory communicatively coupled to at least one of the processors;
wherein the memory has stored therein a computer program executable by at least one of the processors to implement the method of calculating energy efficiency for air conditioner capacity of any one of claims 1-7 when the computer program is executed by the at least one processor.
9. A computer storage medium on which a computer program is stored, wherein the computer program, when executed by a processor, implements the method of calculating air conditioner capacity energy efficiency according to any one of claims 1 to 7.
10. An air conditioner, comprising:
the system comprises a compressor, an indoor heat exchanger, an outdoor heat exchanger and a throttling element;
the pressure sensor is used for collecting the exhaust pressure of the compressor;
the first temperature sensor is arranged at one end of the indoor heat exchanger;
the second temperature sensor is arranged at one end of the outdoor heat exchanger;
a third temperature sensor disposed at an air suction port of the compressor;
a fourth temperature sensor disposed at an exhaust port of the compressor;
a controller, connected to the pressure sensor, the first temperature sensor, the second temperature sensor, the third temperature sensor and the fourth temperature sensor, respectively, for performing the method of calculating the energy efficiency of the air conditioner according to any one of claims 1 to 7.
11. The air conditioner according to claim 10, further comprising:
the fifth temperature sensor is connected with the controller and used for collecting the indoor environment temperature;
the sixth temperature sensor is connected with the controller and used for collecting the outdoor environment temperature;
the controller is also used for correcting the temperature detected by the sensor according to the indoor environment temperature and the outdoor environment temperature.
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