CN113175738B - 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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CN113175738B
CN113175738B CN202110430826.1A CN202110430826A CN113175738B CN 113175738 B CN113175738 B CN 113175738B CN 202110430826 A CN202110430826 A CN 202110430826A CN 113175738 B CN113175738 B CN 113175738B
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compressor
temperature
heat exchanger
air conditioner
capacity
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CN113175738A (en
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刘睿
潘京大
李学良
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Hisense Shandong Air Conditioning Co Ltd
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Hisense Shandong 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: acquiring the frequency of a compressor, 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 the suction pressure and the discharge pressure of a compressor, and obtaining the suction enthalpy value and the discharge enthalpy value of the compressor; obtaining a supercooling degree according to the exhaust temperature of the compressor, the temperature of the indoor heat exchanger and the temperature of the outdoor heat exchanger, and obtaining a supercooling enthalpy value under the current operation working condition according to the supercooling degree, the temperature of the indoor heat exchanger, the temperature of the outdoor heat exchanger and the exhaust pressure of the compressor; 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
The testing of the capacity and the energy efficiency of the air conditioner is usually carried out in an enthalpy difference laboratory, and the power consumption in the air conditioner can be obtained by directly utilizing a power meter connected to the air conditioner in the enthalpy difference laboratory. 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 is characterized in that the operation capacity of the air conditioner is calculated by adopting the enthalpy difference of the refrigerant side, the refrigerant flow value is generally obtained by adopting a scheme of arranging a flow sensor or a compressor enthalpy difference method scheme, when the compressor enthalpy difference method scheme is adopted, the enthalpy values of the refrigerant at the inlet and the outlet of a heat exchanger are obtained by fitting through different temperature measuring points, and the compressor power is the residual power obtained by subtracting the estimated heat dissipation capacity of the refrigerant oil to the environment from the compressor power 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 by fitting and correcting the 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. In addition, 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 flow sensor 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: acquiring the frequency of a compressor, 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 the suction pressure and the discharge pressure of a compressor according to the temperature of the indoor heat exchanger and the temperature of the outdoor heat exchanger; 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 supercooling degree according to the exhaust temperature of the compressor, the temperature of the indoor heat exchanger and the temperature of the outdoor heat exchanger, and obtaining a supercooling enthalpy value under the current operation working condition according to the supercooling degree, the temperature of the indoor heat exchanger, the temperature of the outdoor heat exchanger and the exhaust pressure of the compressor; 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 refrigerant flow value is obtained according to the frequency of the compressor, the temperature of the indoor heat exchanger, the temperature of the outdoor heat exchanger, the suction temperature of the compressor, the exhaust temperature of the compressor and the characteristic parameters of the compressor, no additional test equipment such as a flow sensor is needed to be added, the cost is saved, when the air conditioner operates under different working conditions, the refrigerant physical property table is inquired according to the temperature value and the pressure value to obtain the enthalpy value of each state point, 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, namely the capacity of the air conditioner in the actual operation state is determined, therefore, under the condition that enthalpy difference laboratory test conditions are not provided, data support can be provided for a user to know the operation state of the air conditioner in time, and the air conditioner is more beneficial to matching the operation load which is more accordant with the current environment, the energy saving degree and the comfort degree of the air conditioner are improved.
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 a compressor suction port according to the compressor suction pressure and the compressor suction temperature; 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 BDA0003031291490000031
Figure BDA0003031291490000032
wherein q ismC0, c1, c2, c3 and c4 are all fitting coefficients under the refrigeration working condition for the refrigerant flow value, and PeFor the suction pressure of said compressor, PcFor the compressor discharge pressure, FrFor the compressor frequency, V is the compressor fixed volume, VsIs the specific heat capacity.
In some embodiments of the present invention, obtaining a supercooling degree according to the compressor discharge temperature, the indoor heat exchanger temperature, and the outdoor heat exchanger temperature under a refrigeration condition of the air conditioner, and obtaining a supercooling enthalpy value under the current operation condition according to the supercooling degree, the indoor heat exchanger temperature, the outdoor heat exchanger temperature, and the compressor discharge pressure comprises: calculating the supercooling degree by the following formula: Δ T3 ═ b1+ b2 × Δ T1+ b3 × T4+ b4 × Δ T1 × T4; Δ T1 ═ (T4-T2); wherein b1, b2, b3 and b4 are fitting coefficients, Δ T3 is the supercooling degree, Δ T1 is the compressor exhaust superheat degree, T4 is the compressor exhaust temperature, and T2 is the outdoor heat exchanger temperature; calculating the difference value between the temperature of the outdoor heat exchanger and the supercooling degree to obtain the supercooling temperature of the outlet of the outdoor heat exchanger; and inquiring a refrigerant physical property table according to the supercooling temperature of the outlet 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.
In some embodiments of the present invention, under a refrigeration condition of the air conditioner, obtaining a cooling capacity/a heating capacity of the air conditioner 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 rate, H3For the suction enthalpy value of said compressor, H5The supercooling enthalpy value of the outdoor heat exchanger.
In some embodiments of the present invention, obtaining a compressor suction pressure and a compressor discharge pressure according to the indoor heat exchanger temperature and the outdoor heat exchanger temperature under a cooling condition of the air conditioner comprises: and obtaining the suction pressure of the compressor according to the temperature of the indoor heat exchanger, and obtaining the discharge pressure of the compressor according to the temperature of the outdoor heat exchanger.
In some embodiments of the present invention, obtaining a supercooling degree according to the compressor discharge temperature, the indoor heat exchanger temperature, and the outdoor heat exchanger temperature under the heating working condition of the air conditioner, and obtaining a supercooling enthalpy value under the current operating working condition according to the supercooling degree, the indoor heat exchanger temperature, the outdoor heat exchanger temperature, and the compressor discharge pressure includes: calculating the supercooling degree by the following formula: Δ T6 ═ b1+ b2 × Δ T1+ b3 × T4+ b4 × Δ T1 × T4; Δ T1 ═ (T4-T1); b1, b2, b3 and b4 are fitting coefficients, delta T6 is the supercooling degree, delta T1 is the compressor exhaust superheat degree, T4 is the compressor exhaust temperature, and T1 is the indoor heat exchanger temperature; calculating the difference value between the temperature of the indoor heat exchanger and the supercooling degree to obtain the supercooling temperature of the outlet of the indoor heat exchanger; and inquiring a refrigerant physical property table according to the supercooling temperature of the outlet of the indoor heat exchanger and the exhaust pressure of the compressor to obtain the supercooling enthalpy value of the indoor heat exchanger under the heating working condition.
In some embodiments of the present invention, in a heating condition of the air conditioner, obtaining a cooling capacity/a heating capacity of the air conditioner according to the refrigerant flow value, the compressor suction enthalpy value, the compressor discharge enthalpy value, and the supercooling enthalpy value includes: 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 present invention, obtaining a compressor suction pressure and a compressor discharge pressure according to the indoor heat exchanger temperature and the outdoor heat exchanger temperature under the heating condition comprises: and obtaining the suction pressure of the compressor according to the temperature of the outdoor heat exchanger, and obtaining the discharge pressure of the compressor according to the temperature 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 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 computer program is executed by at least one processor to implement the method for calculating the energy efficiency of the air conditioner capacity according to any one of the above embodiments.
According to the air conditioner provided by the embodiment of the invention, when the processor executes the computer program in the memory, the method for calculating the capacity and energy efficiency of the air conditioner is realized, the capacity and energy efficiency of the air conditioner can be obtained without depending on enthalpy difference laboratory test conditions, additional test equipment is not required, and the cost is saved.
In order to solve the above problem, a computer storage medium according to an embodiment 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 capacity 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 an embodiment of a third aspect of the present invention includes: the compressor, the indoor heat exchanger, the outdoor heat exchanger and the throttling element; the first temperature sensor is used for acquiring the suction temperature of the compressor; the second temperature sensor is used for collecting the exhaust temperature of the compressor; the third temperature sensor is used for collecting the temperature of the indoor heat exchanger; the fourth temperature sensor is used for collecting the temperature of the outdoor heat exchanger; and the controller is respectively connected with 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 in any embodiment.
According to the air conditioner provided by the embodiment of the invention, based on the controller, 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 capacity and the energy efficiency of the air conditioner in the embodiment, the refrigerant flow can be obtained according to the relevant parameters of the compressor, no additional test equipment is needed, the cost is low, and the refrigerating capacity/heating capacity of the air conditioner can be obtained according to the obtained refrigerant flow value and the enthalpy value of each state point without depending on enthalpy difference laboratory test conditions, so that the capacity of the air conditioner in the actual operation state is determined, data support can be provided for a user to know the operation state of the air conditioner in time, the air conditioner can be matched more favorably with the operation load in the current environment, and the energy saving degree and the comfort degree of the air conditioner are improved.
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 of calculating energy efficiency of air conditioner capacity according to an embodiment of the present invention;
fig. 2 is a flowchart of a method of calculating an energy efficiency of an air conditioner according to another embodiment of the present invention;
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;
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;
fig. 5 is a block diagram of an air conditioner according to an embodiment of the present invention;
fig. 6 is a schematic view of a refrigerant circulation system of an air conditioner according to another embodiment of the present invention.
Reference numerals:
an air conditioner 10;
a processor 1, a memory 2;
the air conditioner comprises a compressor 100, an indoor heat exchanger 200, an outdoor heat exchanger 300, a throttling element 400, a first temperature sensor 500, a second temperature sensor 600, a third temperature sensor 700, a fourth temperature sensor 800 and a four-way valve N.
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 problems that the capacity and energy efficiency test of the air conditioner depends on enthalpy difference laboratory conditions and the cost of flow test equipment needs to be increased in the refrigerant flow test, the embodiment of the invention provides a method for calculating the capacity and 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, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within 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 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 refrigerating 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 4. It should be noted that the step numbers in the present application, such as S1, S2 … S6, S7, 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 … S6, and S7 may be specifically determined according to actual needs, and is not limited to the control in the order of S1 to S7.
In some embodiments of the present invention, as shown in fig. 1, a flowchart of a method for calculating energy efficiency of air conditioner capacity according to an embodiment of the present invention is provided, where the method for calculating energy efficiency of air conditioner capacity at least includes steps S1-S7, which are described as follows.
And S1, acquiring the frequency of the compressor, 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.
The temperature sensor can be arranged to collect 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, a temperature sensor is respectively arranged in the middle of the coil of the indoor heat exchanger and the coil of the outdoor heat exchanger, and is used for acquiring the middle temperature of the indoor heat exchanger and the middle temperature of the outdoor heat exchanger to be used as measured values of the temperature of the indoor heat exchanger and the temperature of the outdoor heat exchanger, and for example, a temperature sensor is respectively arranged at an air suction port and an air exhaust port of the compressor and is used for acquiring the air suction temperature of the compressor and the air 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. The controller of the air conditioner can directly monitor and read the compressor frequency, for example, the compressor frequency can be directly monitored and read 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 suction pressure and the discharge pressure of the compressor according to the temperature of the indoor heat exchanger and the temperature of the outdoor heat exchanger.
Wherein the compressor suction pressure is, for example, denoted by PeRefers to the pressure at the compressor suction. Compressor discharge pressure, e.g. denoted PcRefers to the pressure at the compressor discharge.
In the embodiment, the air conditioner corresponds to the suction pressure P of the compressor under different operating conditions or different refrigerant quantity requirementseAnd compressor discharge pressure PcAnd also different. Specifically, compressor suction pressurePeAnd compressor discharge pressure PcThe temperature is related to the temperature, and the two-phase region of the refrigerant is arranged in the heat exchanger, so that the pressure and the temperature in the two-phase region are in one-to-one correspondence, and the corresponding suction pressure P of the compressor can be calculated and obtained through the temperature T1 of the indoor heat exchanger and the temperature T2 of the outdoor heat exchanger by combining the current operation working condition based on the functional relationship between the pressure and the temperatureeAnd compressor discharge pressure PcAnd a pressure sensor is not needed to be arranged for pressure detection, so that the cost is saved.
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 an embodiment, the enthalpy value of each state point can be obtained by querying the refrigerant property table according to the temperature value and the pressure value of the state point, for example, the suction enthalpy value of the compressor can be obtained by querying the refrigerant property table according to the suction temperature and the suction pressure of the compressor, or the discharge enthalpy value of the compressor can be obtained by querying the refrigerant property table according to the discharge temperature and the discharge pressure of the compressor.
And S5, obtaining the supercooling degree according to the exhaust temperature of the compressor, the temperature of the indoor heat exchanger and the temperature of the outdoor heat exchanger, and obtaining the supercooling enthalpy value under the current operating condition according to the supercooling degree, the temperature of the indoor heat exchanger, the temperature of the outdoor heat exchanger and the exhaust pressure of the compressor.
The supercooling degree is a deviation between a saturation temperature of the refrigerant and an actual temperature of the refrigerant.
In the embodiment, since the supercooling degree is, for example, recorded as Δ T in a proportional relationship with the compressor discharge temperature T4 and the discharge superheat degree Δ T1, that is, the larger the compressor discharge temperature T4, the larger the heat exchange amount, the larger the supercooling degree is, and may be expressed as Δ T ═ f (Δ T1), for example, and the larger the discharge superheat degree, the larger the supercooling degree is, and may be expressed as Δ T ═ f (T4), for example. The exhaust superheat degree delta T1 refers to a temperature difference between the compressor exhaust temperature and a saturation temperature corresponding to the actual condensing pressure, namely the exhaust superheat degree delta T1 is a difference value between the compressor exhaust temperature T4 and the indoor heat exchanger temperature T1 or the outdoor heat exchanger temperature T2. Therefore, referring to the current operation condition, the embodiment of the present invention may obtain the supercooling degree Δ T according to the acquired compressor discharge temperature T4, indoor heat exchanger temperature T1, and outdoor heat exchanger temperature T2.
Furthermore, in order to calculate the capacity of the air conditioner, the enthalpy parameter of the refrigerant at the inlet and the outlet of the heat exchanger needs to be acquired under different operating conditions. Specifically, the fitting correction mode of the temperature points can be adopted according to the acquired supercooling degree delta T, the indoor heat exchanger temperature T1, the outdoor heat exchanger temperature T2 and the compressor discharge pressure PcAnd obtaining the supercooling enthalpy value under the current operation condition.
And S6, 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 frequency of the compressor can be directly monitored and read through the control panel, and the characteristic parameters of the compressor, such as the fixed volume of the compressor, are considered, the characteristic parameters of the compressor are the inherent parameters of the compressor, the characteristic parameters of the compressor can not change due to different operation conditions in actual operation, can be prestored in a controller of an air conditioner, and can be directly taken when the flow value of the refrigerant is calculated. The embodiment of the invention obtains the suction pressure and the discharge pressure of the compressor based on the detected temperature values of the state points, and obtains the flow value of the refrigerant by combining the frequency of the compressor, the characteristic parameters of the compressor and the pressure value, does not need to add extra flow test equipment, has low cost and 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 and the discharge pressure of the compressor based on the state point temperature, the characteristic parameters of the compressor, such as the fixed volume of the compressor, are obtained, and the specific heat capacity of a refrigerant flowing through a suction port of the compressor is obtained according to the suction pressure and the suction temperature of the compressor; and then obtaining fitting parameters and a fitting formula determined by a data fitting mode, and obtaining a 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, namely substituting all the parameters into the fitting formula to obtain the refrigerant flow value under the current operating condition.
And S7, obtaining the refrigerating capacity/heating capacity of the air conditioner under the front 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.
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 compressor suction enthalpy, H5For heat exchange outdoorsThe subcooled enthalpy of the vessel.
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 refrigerant flow value is obtained according to the compressor frequency, the temperature of the indoor heat exchanger, the temperature of the outdoor heat exchanger, the suction temperature of the compressor, the exhaust temperature of the compressor and the characteristic parameters of the compressor, additional test equipment such as a flow sensor is not needed, and the cost is saved. 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.
Further, in the embodiment of the present invention, for obtaining the flow value, an additional measurement and shooting 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 a refrigerant capacity, an electronic control board of the outdoor unit can be set, the compressor frequency is monitored and read through 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 through calculation.
In some embodiments of the present invention, the refrigerant flow rate value may be obtained by calculating according to the following equation (1-3):
Figure BDA0003031291490000101
wherein q ismC0, c1, c2, c3 and c4 are all fitting coefficients for the 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 compressoreObtaining specific heat capacity V of refrigerant according to suction temperature T3 of compressors. 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 (1-3) 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 circulation path of a refrigerant is as follows: compressor discharge port-outdoor heat exchanger-throttling element-indoor heat exchanger-compressor suction port.
Under the refrigeration working condition, the determination of the high pressure and the low pressure of the compressor can obtain the suction pressure of the compressor according to the temperature of the indoor heat exchanger, and obtain the exhaust pressure of the compressor according to the temperature of the outdoor heat exchanger.
Specifically, under the refrigeration working condition of the air conditioner, the temperature sensor detects the temperature of the indoor heat exchanger and is recorded as T1, the temperature sensor detects the temperature of the outdoor heat exchanger T2, and the suction pressure P of the compressor can be obtained according to the formula (1-4)eThe compressor discharge pressure P can be obtained according to the formula (1-5)c。
Pe＝a1+a2×eT1/a3(ii) a Formula (1-4)
Pc＝a1+a2×eT2/a3(ii) a Formula (1-5)
Wherein a1, a2 and a3 are fitting coefficients, as shown in table one, which is a lookup table of fitting coefficients according to an embodiment of the present invention, and specific values of fitting coefficients a1, a2 and a3 under refrigerants R32 and R410A are given in table one.
Watch 1
Coefficient of fit R410A R32
a1 -0.59255 -0.66145
a2 1.38959 1.47115
a3 -51.81752 -52.79328
Under the refrigeration working condition, as for the enthalpy value of each state point, specifically, by inquiring the refrigerant physical property table, the suction enthalpy value H of the compressor can be obtained according to the suction temperature T3 of the compressor and the suction pressure Pe of the compressor3And obtaining the discharge enthalpy value H of the compressor according to the discharge temperature T4 and the discharge pressure Pc of the compressor4。
Fig. 2 is a flowchart of a method of calculating an energy efficiency of an air conditioner according to another embodiment of the present invention.
For the enthalpy value of the outdoor heat exchanger, the supercooling degree is obtained according to the discharge temperature of the compressor, the temperature of the indoor heat exchanger and the temperature of the outdoor heat exchanger, and the supercooling enthalpy value under the refrigeration condition is obtained according to the supercooling degree, the temperature of the indoor heat exchanger, the temperature of the outdoor heat exchanger and the discharge pressure of the compressor, as shown in fig. 2, steps S51 to S53 may be included, specifically as follows.
S51, the supercooling degree may be obtained by calculation according to the formulas (1-6) and (1-7), as follows.
Δ T3 ═ b1+ b2 × Δ T1+ b3 × T4+ b4 × Δ T1 × T4; formula (1-6)
Δ T1 ═ (T4-T2); formula (1-7)
Wherein b1, b2, b3 and b4 are fitting coefficients, Δ T3 is the supercooling degree under the refrigeration condition, Δ T1 is the discharge superheat degree of the compressor, T4 is the discharge temperature of the compressor, and T2 is the temperature of the outdoor heat exchanger. The outdoor heat exchanger is provided with a temperature sensor for acquiring the temperature T2 of the outdoor heat exchanger, and the air outlet of the compressor is also provided with a temperature sensor for acquiring the air exhaust temperature T4 of the compressor.
In some embodiments of the invention, as can be seen from the equations (1-6), the degree of subcooling Δ T3 is related to the degree of superheat Δ T1 of the compressor discharge air, and the greater the degree of superheat Δ T1 of the compressor discharge air, the greater the degree of subcooling Δ T3, i.e., Δ T3 ═ f (Δ T1). As shown in the formula (1-7), under the refrigeration working condition, the compressor discharge air temperature T4 and the outdoor heat exchanger temperature T2 are subjected to subtraction calculation to obtain the compressor discharge air superheat degree delta T1, the supercooling degree delta T3 is related to the compressor discharge air temperature T4, the higher the compressor discharge air temperature T4 is, the larger the heat exchange amount is, the larger the supercooling degree delta T3 is, namely, delta T3 is greater than oc f (T4).
And S52, calculating the difference value between the temperature of the outdoor heat exchanger and the supercooling degree to obtain the supercooling temperature of the outlet of the outdoor heat exchanger. And subtracting the outdoor heat exchanger temperature T2 from the supercooling degree delta T3 to obtain the supercooling temperature of the outdoor heat exchanger outlet, and recording the temperature as T5.
And S53, querying a refrigerant physical property table according to the supercooling temperature of the outdoor heat exchanger outlet and the compressor discharge pressure to obtain the supercooling enthalpy value of the outdoor heat exchanger under the refrigeration working condition.
Wherein, by inquiring the refrigerant physical property table, the supercooling temperature T5 of the outdoor heat exchanger outlet and the compressor discharge pressure P can be determinedcObtaining the supercooling enthalpy of the outdoor heat exchanger under refrigeration, e.g. H5。
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 frequency of the compressor, the characteristic parameters of the compressor, the obtained suction pressure of the compressor and the obtained discharge pressure of the compressormFor example, the refrigerant flow rate value q can be obtained by substituting the parameters into the above formula (1-3)m。
Furthermore, the refrigerating capacity/heating capacity of the air conditioner is 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 refrigerating capacity/heating capacity of the air conditioner can be obtained by substituting each parameter into the above 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 can be matched more favorably with 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: compressor discharge port-indoor heat exchanger-throttling element-outdoor heat exchanger-compressor suction port.
In the heating condition, for the determination of the high pressure and the low pressure of the compressor, the suction pressure of the compressor can be obtained according to the temperature of the outdoor heat exchanger, and the discharge pressure of the compressor can be obtained according to the temperature of the indoor heat exchanger.
Specifically, under the heating working condition of the air conditioner, the temperature sensor detects the temperature T1 of the indoor heat exchanger, the temperature sensor detects the temperature T2 of the outdoor heat exchanger, the suction pressure Pe of the compressor can be obtained according to the formula (1-8), and the discharge pressure Pc of the compressor can be obtained according to the formula (1-9).
Pe＝a1+a2×eT2/a3(ii) a Formula (1-8)
Pc＝a1+a2×eT1/a3(ii) a Formula (1-9)
Wherein, a1, a2 and a3 are all fitting coefficients, and the station positions and the values of a1, a2 and a3 can be queried according to the first table.
Under the heating condition, for the enthalpy value of each state point, specifically, by inquiring the refrigerant physical property table, the suction enthalpy value H of the compressor can be obtained according to the suction temperature T3 of the compressor and the suction pressure Pe of the compressor3And obtaining the discharge enthalpy value H of the compressor according to the discharge temperature T4 and the discharge pressure Pc of the compressor4。
Fig. 3 is a flowchart of a method of calculating an energy efficiency of an air conditioner according to still another embodiment of the present invention.
For the indoor heat exchanger enthalpy value, the supercooling degree is obtained according to the compressor exhaust temperature, the indoor heat exchanger temperature and the outdoor heat exchanger temperature, and the supercooling enthalpy value under the heating working condition is obtained according to the supercooling degree, the indoor heat exchanger temperature, the outdoor heat exchanger temperature and the compressor exhaust pressure, as shown in fig. 3, steps S54-S56 may be included, which are specifically as follows.
And S54, calculating according to the formula (1-10) and the formula (1-11) to obtain the supercooling degree, which is as follows.
Δ T6 ═ b1+ b2 × Δ T1+ b3 × T4+ b4 × Δ T1 × T4; formula (1-10)
Δ T1 ═ (T4-T1); formula (1-11)
Wherein b1, b2, b3 and b4 are fitting coefficients, Δ T6 is the supercooling degree under the heating working condition, Δ T1 is the exhaust superheat degree of the compressor, T4 is the exhaust temperature of the compressor, and T1 is the temperature of the indoor heat exchanger. A temperature sensor is arranged in the indoor heat exchanger and used for acquiring the temperature T1 of the indoor heat exchanger, and a temperature sensor is also arranged at the air outlet of the compressor and used for acquiring the air exhaust temperature T4 of the compressor.
In some embodiments of the invention, as can be seen from the equations (1-10), the degree of subcooling Δ T6 is related to the degree of superheat Δ T1 of the compressor discharge air, and the greater the degree of superheat Δ T1 of the compressor discharge air, the greater the degree of subcooling Δ T6, i.e., Δ T6 ═ f (Δ T1). As shown in the formula (1-11), under the heating condition, the compressor discharge air temperature T4 and the indoor heat exchanger temperature T1 are subtracted to obtain the compressor discharge air superheat degree Δ T1, so that the supercooling degree Δ T6 is related to the compressor discharge air temperature T4, and the higher the compressor discharge air temperature T4 is, the larger the heat exchange amount is, the larger the supercooling degree Δ T6 is, namely, Δ T6 ═ f (T4).
And S55, calculating the difference value between the temperature of the indoor heat exchanger and the supercooling degree to obtain the supercooling temperature of the outlet of the indoor heat exchanger. And subtracting the indoor heat exchanger temperature T1 from the supercooling degree delta T6 to obtain the supercooling temperature of the outlet of the indoor heat exchanger, and recording the temperature as T6.
And S56, querying a refrigerant physical property table according to the supercooling temperature of the outlet of the indoor heat exchanger and the exhaust pressure of the compressor to obtain the supercooling enthalpy value of the indoor heat exchanger under the heating working condition.
Wherein, by inquiring the refrigerant physical property table, the supercooling temperature T6 of the indoor heat exchanger outlet and the compressor discharge pressure P can be determinedcObtaining the supercooling enthalpy value of the indoor heat exchanger under the heating working condition, for example, recording as H6。
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 frequency of the compressor, the characteristic parameters of the compressor, the obtained suction pressure of the compressor and the obtained discharge pressure of the compressormFor example, the refrigerant flow rate value q can be obtained by substituting the parameters into the above formula (1-3)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 (1-2) of the heating 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 can be matched more favorably with 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. 4, 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 S8 and S9, which are described as follows.
And S8, acquiring the power consumption of the air conditioner. Here, the power consumption of the air conditioner is represented by W.
And S9, 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 BDA0003031291490000141
Figure BDA0003031291490000142
In summary, the method for calculating the energy efficiency of the air conditioner according to the embodiment of the present invention obtains the refrigerant flow value under the current operating condition based on the compressor frequency, the compressor characteristic parameter, and the temperature value of each state point, does not need to add additional testing equipment, has low cost, is suitable for being applied to products, does not depend on enthalpy difference laboratory test adjustment, can obtain the energy efficiency of the air conditioner under the current operating 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. 5 is a block diagram of an air conditioner according to an embodiment of the present invention. As shown in fig. 5, the air conditioner 10 includes at least one processor 1 and a memory 2, and the memory 2 is communicatively connected to the at least one processor 1.
The memory 2 stores 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 the above embodiment when executing the computer program, and the implementation process of the method for calculating the energy efficiency of the air conditioner may refer to the description of the above embodiment, which is not described herein again.
According to the air conditioner 10 of the embodiment of the present invention, the memory 2 stores a computer program, when the air conditioner 10 is powered on, the processor 1 obtains and executes the computer program in the memory 2, 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. The air conditioner 10 runs under the working condition of refrigeration or heating, the processor 1 executes the computer program to realize the method for calculating the capacity and the energy efficiency of the air conditioner, 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 the energy efficiency of air conditioner capacity 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 is executed, the operation parameters of each structure in the air conditioner can be obtained for analysis and calculation, so that the method for calculating the capacity and 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 refrigerant flow value test equipment is needed, the cost is saved, the capacity and energy efficiency of the actual operation process of the air conditioner can be directly obtained through calculation when the air conditioner operates under the refrigeration or heating working condition, and therefore, the operation mode is optimized in real time, the air conditioner can operate more to match the load of the environment, and the energy is saved and the air conditioner is more comfortable.
Fig. 6 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. 6, the air conditioner 10 includes a compressor 100, an indoor heat exchanger 200, an outdoor heat exchanger 300, a throttling element 400, a first temperature sensor 500, a second temperature sensor 600, a third temperature sensor 700, a fourth temperature sensor 800, and a controller (not shown).
The throttling element 400 is used for adjusting the pressure of the refrigerant under the refrigeration condition or the heating condition of the air conditioner 10. The first temperature sensor 500 is disposed at a suction port of the compressor 100 for collecting a suction temperature of the compressor, and the second temperature sensor 600 is disposed at a discharge port of the compressor for collecting a discharge temperature of the compressor.
The third temperature sensor 700 is used to collect the indoor heat exchanger temperature and the fourth temperature sensor 800 is used to collect the outdoor heat exchanger temperature. Among them, the third temperature sensor 700 may be disposed at the middle of the indoor heat exchanger 200 to collect the indoor heat exchanger middle temperature as the indoor heat exchanger temperature, and the fourth temperature sensor 800 may be disposed at the middle of the outdoor heat exchanger 300 to collect the outdoor heat exchanger middle temperature as the outdoor heat exchanger temperature.
The controller is connected to the first temperature sensor 500, the second temperature sensor 600, the third temperature sensor 700, and the fourth temperature sensor 800, respectively, for performing the method of calculating the energy efficiency of the air conditioner according to the above embodiment.
The controller acquires temperature information acquired by the first temperature sensor 500, the second temperature sensor 600, the third temperature sensor 700 and the fourth temperature sensor 800, that is, the controller can acquire 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, and analyzes and calculates the acquired temperature information, so as to acquire the cooling capacity/heating capacity of the air conditioner 100, and further, the effective value of the air conditioner under the current operation condition is acquired 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.
In an embodiment, as shown in fig. 6, 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. 6, when the air conditioner 10 operates in the cooling working condition and the heating working condition, the circulation directions of the refrigerant gas in the air conditioner 10 are different, the suction pressure of the compressor can be obtained according to the temperature of the indoor heat exchanger under the cooling working condition of the air conditioner 10, and the discharge pressure of the compressor can be obtained according to the temperature of the outdoor heat exchanger under the heating working condition of the air conditioner 10, so as to implement the method for calculating the energy efficiency of the air conditioner according to any one of the above embodiments.
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.
According to the air conditioner 10 of the embodiment of the present invention, the controller is connected to the first temperature sensor 500, the second temperature sensor 600, the third temperature sensor 700, and the fourth temperature sensor 800, and analyzes, calculates, and processes the temperature values collected by the four temperature sensors, so as to control the operation states of the compressor 100, the indoor heat exchanger 200, the outdoor heat exchanger 300, the throttling element 400, and other structures. The method for calculating the energy efficiency of the air conditioner is applied to the air conditioner 10, no additional test equipment is needed, a user can carry out the energy efficiency test on the air conditioner 10 at home, and the running state of the air conditioner 10 is accurately judged in time, so that the running mode is optimized in real time, the running of the air conditioner 10 is more matched with the load of the environment, and the air conditioner is more energy-saving and comfortable.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example.
While embodiments of the 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 (12)

1. A method for calculating the energy efficiency of the capacity of an air conditioner is characterized by comprising the following steps:
acquiring the frequency of a compressor, 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 the suction pressure and the discharge pressure of a compressor according to the temperature of the indoor heat exchanger and the temperature of the outdoor heat exchanger;
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 supercooling degree according to the compressor exhaust temperature, the indoor heat exchanger temperature and the outdoor heat exchanger temperature, and obtaining a supercooling enthalpy value under the current operation working condition according to the supercooling degree, the indoor heat exchanger temperature, the outdoor heat exchanger temperature and the compressor exhaust pressure, wherein the supercooling degree is calculated by the following formula under the refrigeration working condition of the air conditioner:
ΔT3＝b1+b2×ΔT1+b3×T4+b4×ΔT1×T4；
ΔT1＝(T4-T2)；
wherein b1, b2, b3 and b4 are fitting coefficients, Δ T3 is the supercooling degree, Δ T1 is the compressor exhaust superheat degree, T4 is the compressor exhaust temperature, and T2 is the outdoor heat exchanger temperature;
calculating the difference value between the temperature of the outdoor heat exchanger and the supercooling degree to obtain the supercooling temperature of the outlet of the outdoor heat exchanger;
inquiring a refrigerant physical property table according to the supercooling temperature of the outlet 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;
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.
2. The method for calculating the energy efficiency of the air conditioner according to claim 1, wherein under a cooling 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 comprises:
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 a compressor suction port according to the compressor suction pressure and the compressor suction temperature;
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.
3. The method for calculating the energy efficiency of the air conditioner according to claim 2, wherein the step of 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 the following steps:
calculating the refrigerant flow value by the following formula:
Figure FDA0003521015540000021
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 fixed volume, VsIs the specific heat capacity.
4. The method of calculating energy efficiency of air conditioner capacity according to claim 1,
under the refrigeration working condition of the air conditioner, the refrigerating capacity/heating capacity of the air conditioner is obtained according to the refrigerant flow value, the compressor air suction enthalpy value, the compressor exhaust enthalpy value and the supercooling enthalpy value, and the method comprises the following steps:
the cooling capacity is obtained by the following formula:
Qrefrigerating capacity＝qm×(H3-H5)；
Wherein Q isRefrigerating capacityFor said refrigerating capacity, qmIs the refrigerant flow rate, H3For the suction enthalpy value of said compressor, H5The supercooling enthalpy value of the outdoor heat exchanger.
5. The method for calculating the energy efficiency of the air conditioner according to claim 1, wherein under the refrigerating condition of the air conditioner, obtaining the suction pressure and the discharge pressure of the compressor according to the temperature of the indoor heat exchanger and the temperature of the outdoor heat exchanger comprises the following steps:
and obtaining the suction pressure of the compressor according to the temperature of the indoor heat exchanger, and obtaining the discharge pressure of the compressor according to the temperature of the outdoor heat exchanger.
6. The method for calculating the energy efficiency of the air conditioner according to any one of claims 1 to 3, wherein in the heating working condition of the air conditioner, obtaining the supercooling degree according to the exhaust temperature of the compressor, the temperature of the indoor heat exchanger and the temperature of the outdoor heat exchanger, and obtaining the supercooling enthalpy value under the current working condition according to the supercooling degree, the temperature of the indoor heat exchanger, the temperature of the outdoor heat exchanger and the exhaust pressure of the compressor comprises the following steps:
calculating the supercooling degree by the following formula:
ΔT6＝b1+b2×ΔT1+b3×T4+b4×ΔT1×T4；
ΔT1＝(T4-T1)；
b1, b2, b3 and b4 are fitting coefficients, delta T6 is the supercooling degree, delta T1 is the compressor exhaust superheat degree, T4 is the compressor exhaust temperature, and T1 is the indoor heat exchanger temperature;
calculating the difference value between the temperature of the indoor heat exchanger and the supercooling degree to obtain the supercooling temperature of the outlet of the indoor heat exchanger;
and inquiring a refrigerant physical property table according to the supercooling temperature of the outlet of the indoor heat exchanger and the exhaust pressure of the compressor to obtain the supercooling enthalpy value of the indoor heat exchanger under the heating working condition.
7. The method for calculating the energy efficiency of the air conditioner according to claim 6, wherein the obtaining of the cooling capacity/heating capacity of the air conditioner according to the refrigerant flow value, the compressor suction enthalpy value, the compressor discharge enthalpy value and the supercooling enthalpy value under the heating condition of the air conditioner comprises:
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.
8. The method for calculating the energy efficiency of the air conditioner according to claim 6, wherein obtaining the compressor suction pressure and the compressor discharge pressure according to the indoor heat exchanger temperature and the outdoor heat exchanger temperature under the heating condition comprises:
and obtaining the suction pressure of the compressor according to the temperature of the outdoor heat exchanger, and obtaining the discharge pressure of the compressor according to the temperature of the indoor heat exchanger.
9. 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 value of the air conditioner according to the refrigerating capacity/heating capacity of the air conditioner and the power consumption.
10. 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 perform a method of calculating energy efficiency of air conditioner capacity according to any one of claims 1-9 when the computer program is executed by the at least one processor.
11. A computer storage medium having a computer program stored thereon, wherein the computer program, when executed by a processor, implements the method of calculating air conditioner capacity energy efficiency of any one of claims 1-9.
12. An air conditioner, comprising:
the compressor, the indoor heat exchanger, the outdoor heat exchanger and the throttling element;
the first temperature sensor is used for acquiring the suction temperature of the compressor;
the second temperature sensor is used for collecting the exhaust temperature of the compressor;
the third temperature sensor is used for collecting the temperature of the indoor heat exchanger;
the fourth temperature sensor is used for collecting the temperature of the outdoor heat exchanger;
a controller, connected to 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 9.
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