CN113175733B - Method for calculating capacity energy efficiency of air conditioner, air conditioner and storage medium - Google Patents

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

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CN113175733B
CN113175733B CN202110429714.4A CN202110429714A CN113175733B CN 113175733 B CN113175733 B CN 113175733B CN 202110429714 A CN202110429714 A CN 202110429714A CN 113175733 B CN113175733 B CN 113175733B
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temperature
compressor
heat exchanger
air conditioner
sensor
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CN113175733A (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 air conditioner capacity, an air conditioner and a storage medium, wherein the method for calculating the energy efficiency of the air conditioner capacity comprises the following steps: determining the current operation condition of the air conditioner; obtaining a supercooling enthalpy value, a compressor air suction enthalpy value and a compressor exhaust enthalpy value; obtaining the supercooling degree under the current operation working condition according to 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 temperature of the indoor heat exchanger, the temperature of the outdoor heat exchanger, the suction pressure of the compressor, the discharge pressure of the compressor, the supercooling degree and the characteristic parameters of the throttling element; 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. The method can realize the calculation of the energy efficiency of the air conditioner under the condition of no energy efficiency and enthalpy difference test of the air conditioner, does not need to add auxiliary test equipment, and has low cost.

Description

Method for calculating capacity energy efficiency of air conditioner, air conditioner and storage medium
Technical Field
The invention relates to the technical field of air conditioners, in particular to a method for calculating the capacity and energy efficiency of an air conditioner, the air conditioner and a computer storage medium.
Background
In the related art, the energy efficiency for the air conditioner is obtained by testing in an enthalpy difference laboratory. The enthalpy difference laboratory can adopt an air side enthalpy difference method or a refrigerant side enthalpy difference method to measure the capacity and energy efficiency of the air conditioner. Specifically, the air side enthalpy difference method is that the inlet and outlet air of the indoor unit is subjected to a dry-wet bulb temperature test through an air volume chamber, and the capacity of the air conditioner is determined by the product of the change of the air enthalpy difference and the air volume; the refrigerant side enthalpy difference method is that a temperature sensor and a pressure sensor are arranged at the inlet of a refrigerant pipe of an indoor unit, a flow sensor is arranged at the outlet of a compressor, enthalpy parameters of the refrigerant at the inlet and the outlet of a heat exchanger are obtained by utilizing a table look-up of pressure and temperature, an enthalpy difference is calculated, and the enthalpy difference is multiplied by the flow measured by the flow sensor to calculate the capacity of the air conditioner.
After the air conditioner is actually installed and used, because the using environment does not have the air conditioner capacity and energy efficiency testing conditions, the capacity and energy efficiency of the air conditioner cannot be tested by directly using the air side enthalpy difference method, and a user cannot know the capacity and energy efficiency of the actual operation of the air conditioner. For the refrigerant side enthalpy difference method, although the temperature of the refrigerant can be tested by the temperature sensor, the enthalpy state of the refrigerant side is obtained by fitting and correcting the temperature points by utilizing the functional relation between the pressure and the temperature, and the refrigerant flow is an independent parameter relative to the temperature and the pressure, the enthalpy state cannot be obtained by fitting the temperature points, and the enthalpy state needs to be detected by the flow sensor, the cost is high and the volume is large, so that the enthalpy difference method 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 object of the present invention is to provide a method for calculating the energy efficiency of an air conditioner, which can realize the calculation of the energy efficiency of the air conditioner without enthalpy difference test capability, does not need to add auxiliary test equipment, has low cost, and is easy to implement 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 temperature of an indoor heat exchanger, the temperature of an outdoor heat exchanger, the suction temperature of a compressor and the exhaust temperature of the compressor, and acquiring the discharge pressure of the compressor and the suction pressure of the compressor; determining the current operation condition of the air conditioner; 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 enthalpy value according to the temperature of the indoor heat exchanger, the temperature of the outdoor heat exchanger and the exhaust pressure of the compressor; obtaining the supercooling degree under the current operation working condition according to the temperature of the indoor heat exchanger, the temperature of the outdoor heat exchanger and the discharge pressure of the compressor; obtaining a refrigerant flow value according to the temperature of the indoor heat exchanger, the temperature of the outdoor heat exchanger, the suction pressure of the compressor, the discharge pressure of the compressor, the supercooling degree and the characteristic parameters of a throttling element; 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, under the condition of not having enthalpy difference testing capacity, the refrigerant flow value can be calculated through the temperature of an indoor heat exchanger, the temperature of an outdoor heat exchanger, the air suction temperature of a compressor, the exhaust temperature of the compressor, the exhaust pressure of the compressor and the air suction pressure of the compressor, and characteristic parameters of a throttling element are combined, a testing device for increasing the refrigerant flow is not needed, the cost is saved, the exhaust pressure of the compressor and the air suction pressure of the compressor are collected through a pressure sensor, a pressure value is not needed to be calculated, the calculation amount is reduced, the calculation rate is improved, in addition, the air suction enthalpy value of the compressor, the exhaust enthalpy value of the compressor and the supercooling enthalpy value are obtained through the collected temperature value and the pressure value, the refrigerating capacity or the heating capacity of the air conditioner under the current operation working condition can be obtained through combining the refrigerant flow value, namely the capacity of the air conditioner under the actual operation state is determined, therefore, data support is provided for users 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, obtaining the indoor heat exchanger temperature, the outdoor heat exchanger temperature, the compressor suction temperature, and the compressor discharge temperature comprises: acquiring the frequency of a compressor, the rotating speed of an indoor fan, the rotating speed of an outdoor fan, the indoor environment temperature and the outdoor environment temperature, and acquiring the detection temperature of a first sensor of an indoor heat exchanger, the detection temperature of a second sensor of an outdoor heat exchanger, the detection temperature of a third sensor of a suction port of the compressor and the detection temperature of a fourth sensor of an exhaust port of the compressor; correcting the temperature detected by the first sensor according to the compressor frequency, the indoor fan rotating speed and the indoor environment temperature to obtain an indoor heat exchanger temperature, and correcting the temperature detected by the second sensor, the temperature detected by the third sensor and the temperature detected by the fourth sensor according to the compressor frequency, the outdoor fan rotating speed and the outdoor environment temperature to obtain the outdoor heat exchanger temperature, the compressor suction temperature and the compressor discharge temperature.
In some embodiments, the indoor heat exchanger temperature is obtained by the following equation:
T1＝d1×T11+d2×d3×T6；
d1＝1-d2×d3；
d2＝Fr/1000；
d3＝F1/500；
wherein T1 is the indoor heat exchanger temperature, T11 is the first sensor detection temperature, T6 is the indoor environment temperature, d1, d2 and d3 are correction coefficients, and Fr is the compressor frequency; f1 is the indoor fan speed;
obtaining the outdoor heat exchanger temperature, the compressor suction temperature, and the compressor discharge temperature by the following equations:
Ti＝d1×Tn+d2×d3×T5；
d1＝1-d2×d3；
d2＝Fr/1000；
d3＝F2/500；
wherein, TnT12 is the second sensor detecting temperature and TiT2 is the outdoor heat exchanger temperature, ornT13 is the third sensor detecting temperature and Ti-T3 is the compressor suction temperature, ornT14 is the fourth sensor detects temperature and TiT4 is the compressor discharge temperature, T5 is the outdoor ambient temperature, and F2 is the outdoor fan speed.
In some embodiments, obtaining the degree of subcooling at the current operating condition based on the indoor heat exchanger temperature, the outdoor heat exchanger temperature and the compressor discharge pressure comprises: under the refrigeration working condition of the air conditioner, obtaining the condensation temperature of an outdoor heat exchanger according to the discharge pressure of the compressor, and calculating the temperature difference between the condensation temperature of the outdoor heat exchanger and the temperature of the outdoor heat exchanger to obtain the supercooling degree of the outdoor heat exchanger; or under the heating working condition of the air conditioner, obtaining the condensation temperature of the indoor heat exchanger according to the exhaust pressure of the compressor, and calculating the temperature difference between the condensation temperature of the indoor heat exchanger and the temperature of the indoor heat exchanger to obtain the supercooling degree of the indoor heat exchanger.
In some embodiments, deriving an indoor heat exchanger condensing temperature or an outdoor heat exchanger condensing temperature based on the compressor discharge pressure comprises:
calculating the indoor heat exchanger condensing temperature or the outdoor heat exchanger condensing temperature by the following formula:
Figure BDA0003030917720000031
wherein T is the condensing temperature of the indoor heat exchanger or the condensing temperature of the outdoor heat exchanger, PcFor the compressor discharge pressure, a1, a2, and a3 are all fitting coefficients.
In some embodiments, obtaining a refrigerant flow value according to the temperature of the indoor heat exchanger, the temperature of the outdoor heat exchanger, the suction pressure of the compressor, the discharge pressure of the compressor, the supercooling degree, and a characteristic parameter of a throttling element under a refrigeration condition of the air conditioner includes: obtaining the density of a refrigerant entering a throttling element according to the temperature of the outdoor heat exchanger, the discharge pressure of the compressor and the supercooling degree; and obtaining the refrigerant flow value according to the compressor suction pressure, the compressor discharge pressure, the supercooling degree, the throttling element characteristic parameter and the refrigerant density.
In some embodiments, obtaining the density of the refrigerant entering the throttling element according to the temperature of the outdoor heat exchanger, the discharge pressure of the compressor and the supercooling degree comprises: 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 density of the refrigerant.
In some embodiments, obtaining the refrigerant flow value according to the compressor suction pressure, the compressor discharge pressure, the supercooling degree, the throttling element characteristic parameter, and the refrigerant density includes:
calculating the refrigerant flow value by the following formula:
Figure BDA0003030917720000041
wherein q ismC0, c1, c2, c3 and c4 are fitting coefficients for the refrigerant flow value, PeFor the suction pressure of said compressor, PcAnd taking the discharge pressure of the compressor, wherein A is the flow cross section area of a throttling element, rho is the density of the refrigerant, and Delta T3 is the supercooling degree.
In some embodiments, obtaining a refrigerant flow value according to the temperature of the indoor heat exchanger, the temperature of the outdoor heat exchanger, the suction pressure of the compressor, the discharge pressure of the compressor, the supercooling degree, and a characteristic parameter of a throttling element under a heating condition of the air conditioner includes: obtaining the density of a refrigerant entering a throttling element according to the temperature of the indoor heat exchanger, the discharge pressure of the compressor and the supercooling degree; and obtaining the refrigerant flow value according to the compressor suction pressure, the compressor discharge pressure, the supercooling degree, the throttling element characteristic parameter and the refrigerant density.
In some embodiments, obtaining the density of the refrigerant entering the throttling element according to the temperature of the indoor heat exchanger, the discharge pressure of the compressor and the supercooling degree comprises: 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 discharge pressure of the compressor to obtain the density of the refrigerant.
In some embodiments, obtaining the refrigerant flow value according to the compressor suction pressure, the compressor discharge pressure, the supercooling degree, the throttling element characteristic parameter, and the refrigerant density includes:
calculating the refrigerant flow value by the following formula:
Figure BDA0003030917720000042
wherein q ismC0, c1, c2, c3 and c4 are fitting coefficients for the refrigerant flow value, PeFor the suction pressure of the compressor, PcAnd the discharge pressure of the compressor is A, the flow cross section area of a throttling element is A, rho is the density of the refrigerant, and delta T6 is the supercooling degree.
In some embodiments, 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.
An embodiment of a second aspect of the present invention provides an air conditioner, including: at least one processor; a memory communicatively coupled to at least one of the processors; the storage device stores a computer program executable by at least one of the processors, and the at least one of the processors implements the method for calculating the energy efficiency of the air conditioner according to the above embodiment when executing the computer program.
According to the air conditioner provided by the embodiment of the invention, the method for calculating the capacity and energy efficiency of the air conditioner provided by the embodiment is adopted by the processor, the capacity and energy efficiency of the air conditioner in actual operation can be calculated, auxiliary measuring and setting equipment does not need to be added, and the cost is saved.
A third aspect of the present invention provides a computer storage medium, on which a computer program is stored, wherein the computer program, when executed by a processor, implements the method for calculating the energy efficiency of the air conditioner capacity according to the foregoing embodiments.
An embodiment of a fourth aspect of the present invention provides an air conditioner, including: the system comprises a compressor, an indoor heat exchanger, an outdoor heat exchanger and a throttling element; the first pressure sensor is used for collecting the exhaust pressure of the compressor; the second pressure sensor is used for collecting the suction pressure of the compressor; the first temperature sensor is arranged on a coil pipe of the indoor heat exchanger; the second temperature sensor is arranged on the coil pipe of the outdoor heat exchanger; a third temperature sensor provided at an air suction port of the compressor; a fourth temperature sensor disposed at an exhaust port of the compressor; and the controller is connected with the first pressure sensor, the second pressure sensor, the first temperature sensor, the second temperature sensor, the third temperature sensor and the fourth temperature sensor respectively and is used for executing the method for calculating the capacity energy efficiency of the air conditioner in the embodiment.
According to the air conditioner provided by the embodiment of the invention, the controller executes the method for calculating the capacity and energy efficiency of the air conditioner, so that the capacity and energy efficiency of the air conditioner in actual operation can be calculated, the air conditioner does not depend on an enthalpy difference laboratory, auxiliary measuring equipment does not need to be added, and the cost is low.
In some embodiments, the air conditioner further comprises an indoor fan, an outdoor fan, a fifth temperature sensor and a sixth temperature sensor, wherein the indoor fan, the outdoor fan, the fifth temperature sensor and the sixth temperature sensor are all connected with the controller, the fifth temperature sensor is used for collecting outdoor environment temperature, and the sixth temperature sensor is used for collecting indoor environment temperature; the controller is further used for obtaining the compressor frequency, the indoor fan rotating speed and the outdoor fan rotating speed, and correcting the detection temperature of the sensor according to the compressor frequency, the indoor fan rotating speed, the outdoor fan rotating speed, the indoor environment temperature and the indoor 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 flowchart of a method of calculating an energy efficiency of an air conditioner according to an embodiment of the present invention;
fig. 2 is a schematic flow diagram of a refrigerant of an air conditioner according to an embodiment of the present invention;
fig. 3 is a schematic structural view of an air conditioner according to an embodiment of the present invention;
fig. 4 is a schematic structural view of an air conditioner according to another embodiment of the present invention.
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.
The air conditioner performs functions such as refrigeration/heating circulation or dehumidification through the compressor, the condenser, the expansion valve and the evaporator, can realize the regulation of the indoor environment, and improves the comfort of the indoor environment. The refrigeration cycle includes a series of processes, for example, involving compression, condensation, expansion, and evaporation, and supplies 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 a condenser, the condenser condenses the compressed refrigerant into a liquid state, and heat is released to the surrounding environment through a condensation process.
The expansion valve expands the liquid-phase refrigerant in a high-temperature and high-pressure state 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-exchanging 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.
However, for obtaining the energy efficiency of the actual operation capacity of the air conditioner, a refrigerant side enthalpy difference method is generally adopted, in the method, the refrigerant side enthalpy difference state is obtained by utilizing the fitting correction of temperature measuring points at different positions, and the refrigerant flow can be obtained by detecting a flow sensor or by calculating through a compressor enthalpy difference method. However, the flow sensor has high cost and large volume, and is difficult to be implemented in products in terms of cost and structural layout; for the refrigerant flow obtained by adopting the compressor enthalpy difference method, the accumulation of multiple fitting and estimated errors exists, and the calculation result has a large error.
In order to solve the above problems, a method for calculating the energy efficiency of the air conditioner according to an embodiment of the present invention is described below with reference to fig. 1, which can calculate the energy efficiency of the air conditioner without enthalpy difference testing capability, does not need to add measuring equipment, is low in cost, and is easy to implement on a product.
As shown in fig. 1, the method for calculating the energy efficiency of the air conditioner according to the embodiment of the present invention at least includes steps S1 to S7, and each step is as follows.
And step S1, 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, and acquiring the discharge pressure of the compressor and the suction pressure of the compressor.
In an embodiment, a temperature sensor may be disposed at a suitable position of the indoor heat exchanger, such as at one end of the indoor heat exchanger shown in fig. 2, to collect the indoor heat exchanger temperature in real time, for example, as T1; a temperature sensor may be provided at an appropriate location of the outdoor heat exchanger, such as at one end of the outdoor heat exchanger shown in fig. 2, to collect the outdoor heat exchanger temperature in real time, such as noted as T2; a temperature sensor and a pressure sensor can be arranged at a compressor suction port, such as shown in fig. 2, so as to acquire the compressor suction temperature, such as T3, and the compressor suction pressure, such as Pe, in real time; a temperature sensor and a pressure sensor, such as shown in fig. 2, may be provided at the compressor discharge to collect in real time the compressor discharge temperature, such as denoted as T4, and the compressor discharge pressure, such as denoted as Pc. Each sensor transmits the acquired data to a controller of the air conditioner, such as an indoor unit controller or an outdoor unit controller, or an independently set controller. And the pressure sensor directly acquires the compressor discharge pressure Pc and the compressor suction pressure Pe, so that the pressure value does not need to be calculated, the calculation amount is reduced, and the calculation rate is improved.
And step S2, determining the current operation condition of the air conditioner.
In an embodiment, the air conditioner is configured with a cooling condition and a heating condition, and after the air conditioner is started, the current operation condition of the air conditioner is determined, the 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 a user starts the air conditioner, the user manually selects the required operation conditions, such as a refrigeration condition and a heating condition, according to actual requirements; or, when the user starts the air conditioner, the user does not receive the operation condition required by 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 cooling condition or a heating condition, after the air conditioner is started.
And step S3, 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 air conditioner may store a refrigerant property table in advance, so that the compressor suction enthalpy value H1 may be obtained by table lookup according to the compressor suction temperature T3 and the compressor suction pressure Pe, and the compressor discharge enthalpy value H2 may be obtained by table lookup according to the compressor discharge temperature T4 and the compressor discharge pressure Pc.
And step S4, obtaining the supercooling enthalpy value according to the temperature of the indoor heat exchanger, the temperature of the outdoor heat exchanger and the exhaust pressure of the compressor.
In the embodiment, the refrigerant property table, i.e., the refrigerant property table, is a physical parameter corresponding to different physical properties of the refrigerant under different conditions, and includes physical parameters such as temperature, pressure, density, enthalpy value, and the like, so that the air conditioner can store the refrigerant property table in advance, and the subcooling enthalpy value, for example, written as H, can be obtained by looking up the table according to the indoor heat exchanger temperature T1, the outdoor heat exchanger temperature T2, and the compressor discharge pressure Pc.
And step S5, obtaining the supercooling degree under the current operation working condition according to 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, for example, Δ T, which is a deviation between a saturation temperature of the refrigerant and an actual temperature of the refrigerant.
In the embodiment, the air conditioner has different corresponding supercooling degrees Δ T under different operating conditions or different refrigerant quantity requirements. Under the current operation condition, the corresponding supercooling degree is obtained according to the difference value between the theoretical crystallization temperature of the refrigerant and the crystallization environment temperature, specifically, the condensation temperature of the heat exchanger under the current operation condition, namely the theoretical crystallization temperature, is calculated according to the compressor discharge pressure Pc, and the supercooling degree delta T under the current operation condition can be obtained according to the condensation temperature of the heat exchanger, the indoor heat exchanger temperature T1 and the outdoor heat exchanger temperature T2.
And step S6, obtaining a refrigerant flow value according to the temperature of the indoor heat exchanger, the temperature of the outdoor heat exchanger, the suction pressure of the compressor, the discharge pressure of the compressor, the supercooling degree and the characteristic parameters of the throttling element.
In the embodiment, the characteristic parameters of the throttling element such as the flow cross-sectional area of the throttling element are considered as the inherent properties of the air conditioner, namely the characteristic parameters of the throttling element cannot be changed due to different operating conditions in actual operation, so that the refrigerant flow value, for example, marked as q, is obtained by using the characteristic parameters of the throttling elementmTherefore, under the condition of no enthalpy difference testing capability, the refrigerant flow value q can be obtained by combining the characteristic parameters of the throttling element based on the detected temperature values at different positionsmAnd a refrigerant flow sensor is not required to be added, so that the cost is saved.
Specifically, the flowing direction of the refrigerant is different under different operating conditions, and the direction of the refrigerant entering the throttling element is also different. Under the current operating condition, the density of the refrigerant entering the throttling element is calculated according to the temperature T1 of the indoor heat exchanger, the temperature T2 of the outdoor heat exchanger, the suction pressure Pe of the compressor, the discharge pressure Pc of the compressor and the supercooling degree delta T, and is recorded as rho,further, a refrigerant flow rate value, for example, q, is obtained by using a characteristic parameter of the throttling element, such as a flow cross-sectional area of the throttling elementmTherefore, under the condition of no enthalpy difference testing capability, the refrigerant flow value q can be obtained by only extracting temperature values and compressor exhaust pressure values at different positions through the steps S2-S6mFrom this, the refrigerant flow rate value q is calculated in the above mannermThe method has the advantages that the testing equipment for increasing the flow of the refrigerant is not needed, the method is easy to be directly applied to the air conditioner, and the purpose of calculating the actual operation capacity and energy efficiency of the air conditioner at home of a user is facilitated.
The characteristic parameters of the throttling element are inherent properties of the air conditioner, so that the air conditioner can store the characteristic parameters of the throttling element in advance, and when the capacity of the air conditioner is calculated, the refrigerant flow value q of the air conditioner under the current operating condition can be calculated by directly calling the pre-stored characteristic parameters of the throttling elementm。
And step S7, 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.
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 operating condition of the air conditioner by the enthalpy value state parameter of the refrigerant side, for example, under the refrigerating condition, the enthalpy difference is calculated by the enthalpy value parameter of the refrigerant at the inlet and the outlet of the outdoor heat exchanger and is recorded as delta H1, the enthalpy difference is the difference between the suction enthalpy value H1 of the compressor and the supercooling enthalpy value H at the inlet and the outlet of the outdoor heat exchanger, namely, delta H1 is equal to H1-H; under heating condition, enthalpy difference is calculated by enthalpy value parameter of refrigerant at inlet and outlet of indoor heat exchangerThe enthalpy difference is recorded as delta H2, and is the difference between the exhaust enthalpy value H2 of the compressor and the supercooling enthalpy value H at the inlet and the outlet of the indoor heat exchanger, namely, delta H2 is equal to H2-H. Then, the enthalpy difference and the refrigerant flow rate value q calculated under the current operation working condition are calculatedmMultiplying the result by the reference value to obtain the cooling capacity/heating capacity of the air conditioner, for example, in the cooling condition, the cooling capacity Q1 is QmX Δ H1; under the heating working condition, the heating quantity Q2 is QmAnd the multiplied by delta H2, so that the capacity of the air conditioner in the actual operation state is determined according to the refrigerating capacity/heating capacity, the air conditioner is conveniently matched with the operation load which is more consistent with the environment according to the capacity of the air conditioner, and the energy saving degree and the comfort degree of the air conditioner are improved.
According to the method for calculating the capacity and the energy efficiency of the air conditioner, under the condition of not having enthalpy difference testing capacity, the refrigerant flow value can be calculated through the temperature of an indoor heat exchanger, the temperature of an outdoor heat exchanger, the air suction temperature of a compressor, the exhaust temperature of the compressor, the exhaust pressure of the compressor and the air suction pressure of the compressor, and the characteristic parameters of a throttling element are combined, a testing device for increasing the refrigerant flow is not needed, the cost is saved, the exhaust pressure of the compressor and the air suction pressure of the compressor are collected through a pressure sensor, the pressure value is not needed to be calculated again, the calculation amount is reduced, the calculation rate is improved, in addition, the compressor air suction enthalpy value, the exhaust enthalpy value and the supercooling enthalpy value of the compressor are obtained through the collected temperature value and the collected pressure value, the refrigerating capacity or the heating capacity of the air conditioner under the current operation condition can be obtained through combining the refrigerant flow value, and the capacity of the air conditioner under the actual operation state is determined, therefore, data support is provided for users to know the running state of the air conditioner in time, the matching of the air conditioner is more favorable for the running load which is more consistent with the current environment, and the energy saving degree and the comfort level of the air conditioner are improved.
In some embodiments, the first sensor detection temperature T11 is corrected according to the compressor frequency Fr, the indoor fan rotation speed F5825 and the indoor ambient temperature T6 to obtain the indoor heat exchanger temperature T1, and the second sensor detection temperature T12, the third sensor detection temperature T13 and the fourth sensor detection temperature T14 are corrected according to the compressor frequency Fr, the outdoor fan rotation speed F2 and the outdoor ambient temperature T5 to obtain the outdoor heat exchanger temperature T1, respectively, by obtaining the compressor frequency Fr, the indoor fan rotation speed F1, the outdoor ambient temperature T5, the first sensor detection temperature T11, the second sensor detection temperature T12, the third sensor detection temperature T13 and the fourth sensor detection temperature T14, the outdoor heat exchanger temperature T12 and the third sensor detection temperature T13 and the fourth sensor detection temperature T14 are corrected according to the compressor frequency Fr, the outdoor fan rotation speed F2 and the outdoor ambient temperature T5, respectively, to obtain the outdoor heat exchanger temperature T1 Degree T2, compressor suction temperature T3, and compressor discharge temperature T4.
For example, a temperature sensor, such as shown in fig. 2, may be disposed at one end of the indoor heat exchanger, one end of the outdoor heat exchanger, the compressor suction port, and the compressor discharge port, respectively, to acquire the first sensor detection temperature T11, the second sensor detection temperature T12, the third sensor detection temperature T13, and the fourth sensor detection temperature T14 in real time, respectively, and a temperature sensor may be disposed at an appropriate position of the outdoor unit of the air conditioner to acquire the outdoor ambient temperature T5 in real time, and a temperature sensor may be disposed at an appropriate position of the indoor unit of the air conditioner to acquire the indoor ambient temperature T6 in real time. Each temperature sensor transmits the acquired temperature data to a controller of the air conditioner, such as an indoor unit controller or an outdoor unit controller, or an independently set controller. And, the controller of the air conditioner may monitor the operation states of the compressor, the indoor fan and the outdoor fan to acquire the compressor frequency Fr, the indoor fan rotation speed F1 and the outdoor fan rotation speed F2 in real time. Furthermore, because the temperature monitored by the arrangement of temperature points outside the copper pipe of the heat exchanger, such as one end of the heat exchanger and the inlet and outlet of the compressor, is the comprehensive temperature of the combined action of the refrigerant temperature, the rotating speed of the fan and the ambient temperature, therefore, the embodiment of the present invention corrects the first sensor detection temperature T11 according to the compressor frequency Fr, the indoor fan rotation speed F1 and the indoor ambient temperature T6 to obtain the indoor heat exchanger temperature T1, to perform more accurate calculation of the temperature of the refrigerant in the indoor heat exchanger, and, the second sensor detection temperature T12, the third sensor detection temperature T13 and the fourth sensor detection temperature T14 are respectively corrected according to the compressor frequency Fr, the outdoor fan rotation speed F2 and the outdoor ambient temperature T5 to obtain an outdoor heat exchanger temperature T2, a compressor suction temperature T3 and a compressor discharge temperature T4, so that the temperatures of the refrigerant in the outdoor heat exchanger and the refrigerant in the compressor can be calculated more accurately. Therefore, the actual operation capacity of the air conditioner is calculated according to the corrected temperature by correcting the temperature monitored by each temperature point, so that the accuracy of judging the actual operation state of the air conditioner can be improved.
In some embodiments, the indoor heat exchanger temperature T1 is obtained by the following equation.
T1＝d1×T11+d2×d3×T6；
d1＝1-d2×d3；
d2＝Fr/1000；
d3＝F1/500；
Wherein, T1 is the indoor heat exchanger temperature, T11 is the first sensor detection temperature, T6 is the indoor environment temperature, d1, d2 and d3 are all correction coefficients, Fr is the compressor frequency; f1 is the indoor fan speed. Therefore, the temperature T11 detected by the first sensor acquired by the temperature point is corrected to obtain the more accurate temperature T1 of the refrigerant in the indoor heat exchanger, namely the temperature T1 of the indoor heat exchanger, so that the accuracy of calculation is improved when the capacity of the air conditioner is subsequently calculated.
The outdoor heat exchanger temperature T2, the compressor suction temperature T3, and the compressor discharge temperature T4 are obtained by the following equations.
Ti＝d1×Tn+d2×d3×T5；
d1＝1-d2×d3；
d2＝Fr/1000；
d3＝F2/500；
Wherein, TnT12 is the second sensor detecting temperature and TiT2 is the outdoor heat exchanger temperature, ornT13 is the third sensor detecting temperature and TiT3 is the compressor suction temperature, ornT14 is the fourth sensor detecting temperature and TiT4 is the compressor discharge temperature, T5 is the outdoor ambient temperature, and F2 is the outdoor fan speed. Thus, the temperature T12 detected by the second sensor and the temperature T13 detected by the third sensor are collected from the temperature pointsAnd the temperature T14 detected by the fourth sensor is corrected to obtain more accurate temperatures of the refrigerant in the outdoor heat exchanger and the compressor, namely the temperature T2 of the outdoor heat exchanger, the suction temperature T3 of the compressor and the exhaust temperature T4 of the compressor, so that the calculation accuracy is improved when the capacity of the air conditioner is subsequently calculated.
In some embodiments, the air conditioner has different supercooling degrees Δ T under different operating conditions or different refrigerant quantity requirements. Specifically, under the refrigeration condition of the air conditioner, the condensing temperature T7 of the outdoor heat exchanger is obtained according to the discharge pressure Pc of the compressor, and the temperature is the temperature of the middle position of the outdoor heat exchanger, namely the theoretical crystallization temperature of the refrigerant, and then the temperature difference between the condensing temperature T7 of the outdoor heat exchanger and the temperature T2 of the outdoor heat exchanger is calculated to obtain the supercooling degree Δ T3 of the outdoor heat exchanger, such as Δ T3-T7-T1; under the heating working condition of the air conditioner, the condensing temperature T8 of the indoor heat exchanger is obtained according to the discharge pressure Pc of the compressor, the temperature is the temperature of the middle position of the indoor heat exchanger, namely the theoretical crystallization temperature of the refrigerant, and the temperature difference between the condensing temperature T8 of the indoor heat exchanger and the temperature T1 of the indoor heat exchanger is calculated to obtain the supercooling degree delta T6 of the indoor heat exchanger, for example, the temperature is represented as delta T6-T8-T2. Therefore, the refrigerant flow value q under the current operation condition is calculated according to the supercooling degree delta T under different operation conditions by combining the pressure value and the characteristic parameter of the throttling elementmTherefore, a test device for increasing the flow of the refrigerant is not needed, and the actual operation capacity of the air conditioner is easy to calculate on a product.
In some embodiments, the indoor heat exchanger condensing temperature T8 or the outdoor heat exchanger condensing temperature T7 may be calculated according to the compressor discharge pressure by the following equation.
Figure BDA0003030917720000111
Wherein T is the condensing temperature of the indoor heat exchanger or the condensing temperature of the outdoor heat exchanger, PcFor compressor discharge pressure, a1, a2, and a3 are all fit coefficients. Wherein, the fitting coefficients are shown in table 1, the fitting coefficients adopted by different refrigerants are different, and R410A and R32 are differentThe code of the refrigerant.
TABLE 1
Coefficient of fit R410A R32
a1 -0.59255 -0.66145
a2 1.38959 1.47115
a3 -51.81752 -52.79328
I.e. the condensation temperature of the indoor heat exchanger
Figure BDA0003030917720000112
Condensation temperature of outdoor heat exchanger
Figure BDA0003030917720000113
Figure BDA0003030917720000114
Therefore, under different operation conditions, the supercooling degree delta T under the current operation condition is calculated according to the obtained condensation temperature T8 of the indoor heat exchanger or the condensation temperature T7 of the outdoor heat exchanger so as to be used for obtaining the flow value of the refrigerant subsequently, and the current operation condition of the air conditioner is convenient to knowActual operating capacity under operating conditions.
In some embodiments, under the refrigeration condition of the air conditioner, as shown in fig. 2, the flow direction of the refrigerant returns to the compressor after flowing along the compressor, the outdoor heat exchanger, the throttling element and the indoor heat exchanger, so the density ρ of the refrigerant entering the throttling element is obtained according to the temperature T2 of the outdoor heat exchanger, the discharge pressure Pc of the compressor and the supercooling degree Δ T3, where the supercooling degree Δ T3 is the corresponding supercooling degree of the outdoor heat exchanger; and then obtaining a refrigerant flow value q according to the suction pressure Pe of the compressor, the discharge pressure Pc of the compressor, the supercooling degree delta T3, the characteristic parameters of the throttling element and the density rho of the refrigerantm. Therefore, without increasing the testing equipment of the refrigerant flow, the refrigerant flow value q can be calculated by extracting the temperature values and the exhaust pressure values of the compressor at different positions and combining the characteristic parameters of the throttling element and the refrigerant density rhomThereby obtaining the refrigerant flow rate value qmThe actual operation capacity of the air conditioner under the refrigeration working condition can be determined, and the actual operation state of the air conditioner is judged according to the actual operation capacity, so that the operation load of the air conditioner is optimized in real time, and the energy saving degree and the comfort degree are improved.
In some embodiments, the refrigerant density ρ may be obtained by calculating a difference between the outdoor heat exchanger temperature T2 and the supercooling degree Δ T3 to obtain an outdoor heat exchanger outlet supercooling temperature, denoted as Δ T1, and querying the refrigerant property table according to the outdoor heat exchanger outlet supercooling temperature Δ T1 and the compressor discharge pressure Pc. Therefore, the refrigerant flow value q under the refrigeration condition of the air conditioner can be determined according to the obtained refrigerant density rhomThe purpose of realizing the actual operation capacity and energy efficiency of the air conditioner under the refrigeration working condition is facilitated.
Specifically, the air conditioner may store a refrigerant property table in advance, and when calculating the capacity of the air conditioner, the refrigerant density ρ may be obtained by directly looking up the table through the refrigerant property table according to the supercooling temperature Δ T1 at the outlet of the outdoor heat exchanger and the discharge pressure Pc of the compressor.
In some embodiments, the refrigerant flow rate value q is calculated by the following formulam：
Figure BDA0003030917720000121
Wherein q ismC0, c1, c2, c3 and c4 are fitting coefficients for the refrigerant flow value, PeFor compressor suction pressure, PcThe discharge pressure of the compressor is A, the flow cross section area of the throttling element is A, rho is the density of a refrigerant, and delta T3 is the supercooling degree. Thereby, the obtained refrigerant flow rate value q is usedmThe actual operation capacity of the air conditioner under the refrigeration working condition can be determined, and the actual operation state of the air conditioner is judged according to the actual operation capacity, so that the operation load of the air conditioner is optimized in real time, and the energy saving degree and the comfort degree of the air conditioner are improved.
In some embodiments, under the heating condition of the air conditioner, as shown in fig. 2, the flow direction of the refrigerant returns to the compressor after flowing along the compressor, the indoor heat exchanger, the throttling element and the outdoor heat exchanger, so that the density ρ of the refrigerant entering the throttling element is obtained according to the temperature T1 of the indoor heat exchanger, the discharge pressure Pc of the compressor and the supercooling degree, for example, marked as Δ T6, where Δ T6 is the supercooling degree corresponding to the indoor heat exchanger; and further obtaining a refrigerant flow value q according to the compressor suction pressure Pe, the compressor discharge pressure Pc, the supercooling degree delta T6, the throttling element characteristic parameters and the refrigerant density rhom. Therefore, without increasing the testing equipment of the refrigerant flow, the refrigerant flow value q can be calculated by extracting the temperature values and the exhaust pressure values of the compressor at different positions and combining the characteristic parameters of the throttling element and the refrigerant density rhomThereby obtaining the refrigerant flow rate value qmThe actual operation capacity of the air conditioner under the heating condition can be determined, and the actual operation state of the air conditioner is judged according to the actual operation capacity, so that the operation load of the air conditioner is optimized in real time, and the energy saving degree and the comfort degree of the air conditioner are improved.
In some embodiments, the difference between the indoor heat exchanger temperature T1 and the subcooling degree Δ T6 may be calculated to obtain the indoor heat exchanger outlet subcooling temperature, denoted as Δ T2; and inquiring a refrigerant physical property table according to the supercooling temperature delta T2 of the outlet of the indoor heat exchanger and the discharge pressure Pc of the compressor to obtain the density rho of the refrigerant. Thereby, according to the obtained density rho of the refrigerantCan determine the refrigerant flow value q under the heating working condition of the air conditionermThe aim of the actual operation capacity and the energy efficiency of the air conditioner under the heating condition is convenient to realize.
Specifically, the air conditioner may store a refrigerant property table in advance, and when calculating the capacity of the air conditioner, the refrigerant density ρ may be obtained by directly looking up the table through the refrigerant property table according to the supercooling temperature Δ T2 at the outlet of the indoor heat exchanger and the discharge pressure Pc of the compressor.
In some embodiments, the refrigerant flow value is calculated by the following formula:
Figure BDA0003030917720000131
wherein q ismC0, c1, c2, c3 and c4 are fitting coefficients for the refrigerant flow value, PeFor compressor suction pressure, PcThe discharge pressure of the compressor is A, the flow cross section area of the throttling element is A, rho is the density of a refrigerant, and delta T6 is the supercooling degree. Thereby, the obtained refrigerant flow rate value q is usedmThe actual operation capacity of the air conditioner under the heating condition can be determined, and the actual operation state of the air conditioner is judged according to the actual operation capacity, so that the operation load of the air conditioner is optimized in real time, and the energy saving degree and the comfort degree of the air conditioner are improved.
In some embodiments, the method of the present invention further includes obtaining the power consumption of the air conditioner, which may be denoted as W, and obtaining the effective value of the air conditioner according to the cooling capacity/heating capacity and the power consumption of the air conditioner.
Specifically, the power consumption W can be detected directly by using a power meter connected to the air conditioner, and the energy efficiency value of the air conditioner can be calculated and obtained according to the current operation condition of the air conditioner. For example, when the air conditioner is in a cooling condition, the effective value of the air conditioner is
Figure BDA0003030917720000132
When the air conditioner is in the heating working condition, the energy effective value of the air conditioner is
Figure BDA0003030917720000133
Therefore, based on the refrigerating capacity/heating capacity under different operation conditions and in combination with the detected power consumption, the energy efficiency of the air conditioner in actual operation can be calculated, so that a user can make accurate judgment on the actual operation state of the air conditioner conveniently, the control mode of the air conditioner is optimized in real time, the air conditioner is matched with the operation load more conforming to the current environment, and the energy saving degree and the comfort level are improved.
In summary, according to the method for calculating the capacity and energy efficiency of the air conditioner in the embodiment of the present invention, when the air conditioner is in normal operation, the method in the embodiment of the present invention can calculate the refrigerant flow rate value by detecting the temperature values and the monitored pressure values at different positions and combining the characteristic parameters of the throttling element, the calculation method is simple and easy to apply to the air conditioner, no additional testing equipment is required, the cost is saved, and further, the calculation of the capacity and energy efficiency in the actual operation process of the air conditioner can be realized by using the enthalpy value state parameters of the refrigerant side and the power consumption of the air conditioner, so that the method has important significance for obtaining the actual operation state of the air conditioner and matching with the actual nominal capacity.
In a second embodiment of the present invention, an air conditioner is provided, as shown in fig. 3, the air conditioner 10 includes at least one processor 20 and a memory 30 communicatively connected to the at least one processor 20.
The memory 30 stores therein a computer program executable by the at least one processor 20, and the at least one processor 20 implements the method for calculating the energy efficiency of the air conditioner according to the above embodiment when executing the computer program.
According to the air conditioner 10 provided by the embodiment of the invention, the processor 20 adopts the method for calculating the capacity and energy efficiency of the air conditioner provided by the embodiment, so that the capacity and energy efficiency of the air conditioner 10 in actual operation can be calculated, auxiliary measuring and setting equipment does not need to be added, and the cost is saved.
A third embodiment of the present invention provides a computer storage medium having a computer program stored thereon, wherein the computer program, when executed by a processor, implements the method for calculating the energy efficiency of air conditioner capacity provided by the above-mentioned embodiments.
A fourth aspect of the present invention provides an air conditioner 100, as shown in fig. 4, the air conditioner 100 including a compressor 1, an indoor heat exchanger 2, an outdoor heat exchanger 3, a throttling element 4, a first pressure sensor 5, a second pressure sensor 6, a first temperature sensor 7, a second temperature sensor 8, a third temperature sensor 9, a fourth temperature sensor 11, and a controller 12.
The first pressure sensor 5 is used for collecting the exhaust pressure of the compressor; the second pressure sensor 6 is used for collecting the exhaust pressure of the compressor; the first temperature sensor 7 is arranged on a coil of the indoor heat exchanger 2; the second temperature sensor 8 is arranged on the coil of the outdoor heat exchanger 3; the third temperature sensor 9 is arranged at an air suction port of the compressor 1; the fourth temperature sensor 11 is disposed at the discharge port of the compressor 1; the controller 12 is connected to the first pressure sensor 5, the second pressure sensor 6, the first temperature sensor 7, the second temperature sensor 8, the third temperature sensor 9 and the fourth temperature sensor 11, respectively, and is configured to execute the method for calculating the energy efficiency of the air conditioner according to the embodiment.
According to the air conditioner 100 provided by the embodiment of the invention, the controller 12 executes the method for calculating the capacity and energy efficiency of the air conditioner provided by the embodiment, so that the capacity and energy efficiency of the air conditioner 100 in actual operation can be calculated without depending on an enthalpy difference laboratory, auxiliary measuring equipment does not need to be added, and the cost is low.
In some embodiments, as shown in fig. 4, the air conditioner 100 further includes an indoor fan 13, an outdoor fan 14, a fifth temperature sensor 15, and a sixth temperature sensor 16, wherein the indoor fan 13, the outdoor fan 14, the fifth temperature sensor 15, and the sixth temperature sensor 16 are all connected to the controller 12, the fifth temperature sensor 15 is used for collecting the outdoor ambient temperature, and the sixth temperature sensor 16 is used for collecting the indoor ambient temperature. The controller 12 is further configured to obtain the compressor frequency, the indoor fan rotation speed, and the outdoor fan rotation speed, and correct the temperature detected by the sensor according to the compressor frequency, the indoor fan rotation speed, the outdoor fan rotation speed, the indoor ambient temperature, and the indoor ambient temperature.
Specifically, the first temperature sensor 7 is used for collecting a first sensor detection temperature of the indoor heat exchanger 2; the second temperature sensor 8 is used for acquiring the detection temperature of the second sensor of the outdoor heat exchanger 3; the third temperature sensor 9 is used for acquiring the detection temperature of the third sensor of the air suction port of the compressor; the fourth temperature sensor 11 is used for acquiring the fourth sensor detection temperature of the exhaust port of the compressor. The controller 12 is configured to obtain a compressor frequency, correct a first sensor detection temperature according to the compressor frequency and an indoor environment temperature to obtain an indoor heat exchanger temperature, and correct a second sensor detection temperature, a third sensor detection temperature, and a fourth sensor detection temperature according to the compressor frequency and the outdoor environment temperature to obtain an outdoor heat exchanger temperature, a compressor suction temperature, and a compressor discharge temperature, respectively, so as to calculate an actual operation capacity energy efficiency of the air conditioner 100 with the corrected temperatures, and improve accuracy of determining an actual operation state of the air conditioner 100.
In some embodiments, the air conditioner 100 may include a prompt unit for displaying a performance value of the air conditioner. Specifically, after the controller 12 obtains the energy efficiency value under the current operating condition of the air conditioner according to the method for calculating the energy efficiency of the air conditioner provided by the above embodiment, the controller 12 controls the prompting unit to display the energy efficiency value, so that a user can know the actual operating state of the air conditioner in time, the operating load of the air conditioner is optimized in real time, and the energy saving degree and the comfort level are improved. The setting position of the prompting unit is not limited, and the prompting unit may be set on a control panel of an air conditioner, for example.
In the description of this specification, any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing steps of custom logic functions or processes, and alternate implementations are included within the scope of the preferred embodiment of the present invention in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the embodiments of the present invention.
The logic and/or steps represented in the flowcharts or otherwise described herein, e.g., an ordered listing of executable instructions that can be considered to implement logical functions, can be embodied in any computer-readable medium for use by or in connection with an instruction execution system, apparatus, or device, such as a computer-based system, processor-containing system, or other system that can fetch the instructions from the instruction execution system, apparatus, or device and execute the instructions. For the purposes of this description, a "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of the computer-readable medium would include the following: an electrical connection (electronic device) having one or more wires, a portable computer diskette (magnetic device), a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disc read-only memory (CDROM). Additionally, the computer-readable medium could even be paper or another suitable medium upon which the program is printed, as the program can be electronically captured, via for instance optical scanning of the paper or other medium, then compiled, interpreted or otherwise processed in a suitable manner if necessary, and then stored in a computer memory.
It should be understood that portions of the present invention may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, the various steps or methods may be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. If implemented in hardware, as in another embodiment, any one or combination of the following techniques, which are known in the art, may be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application specific integrated circuit having an appropriate combinational logic gate circuit, a Programmable Gate Array (PGA), a Field Programmable Gate Array (FPGA), or the like.
It will be understood by those skilled in the art that all or part of the steps carried out in the method of implementing the above embodiments may be implemented by hardware related to instructions of a program, which may be stored in a computer readable storage medium, and the program, when executed, includes one or a combination of the steps of the method embodiments.
In addition, functional units in the embodiments of the present invention may be integrated into one processing module, or each unit may exist alone physically, or two or more units are integrated into one module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode. The integrated module, if implemented in the form of a software functional module and sold or used as a separate product, may also be stored in a computer-readable storage medium.
The storage medium mentioned above may be a read-only memory, a magnetic or optical disk, etc. Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
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 temperature of an indoor heat exchanger, the temperature of an outdoor heat exchanger, the suction temperature of a compressor and the discharge temperature of the compressor, and acquiring the discharge pressure of the compressor and the suction pressure of the compressor;
determining the current operation condition of the air conditioner;
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 enthalpy value according to the temperature of the indoor heat exchanger, the temperature of the outdoor heat exchanger and the exhaust pressure of the compressor;
obtaining the supercooling degree under the current operation working condition according to the temperature of the indoor heat exchanger, the temperature of the outdoor heat exchanger and the exhaust pressure of the compressor, wherein the obtaining of the supercooling degree under the current operation working condition comprises the following steps:
under the refrigeration working condition of the air conditioner, obtaining the condensation temperature of an outdoor heat exchanger according to the discharge pressure of the compressor, and calculating the temperature difference between the condensation temperature of the outdoor heat exchanger and the temperature of the outdoor heat exchanger to obtain the supercooling degree delta T3 of the outdoor heat exchanger;
or under the heating working condition of the air conditioner, obtaining the condensation temperature of an indoor heat exchanger according to the exhaust pressure of the compressor, and calculating the temperature difference between the condensation temperature of the indoor heat exchanger and the temperature of the indoor heat exchanger to obtain the supercooling degree delta T6 of the indoor heat exchanger;
wherein the indoor heat exchanger condensing temperature or the outdoor heat exchanger condensing temperature is calculated by the following formula:
Figure FDA0003648446180000011
wherein T is the condensing temperature of the indoor heat exchanger or the condensing temperature of the outdoor heat exchanger, PcFor the compressor discharge pressure, a1, a2, and a3 are all fitting coefficients;
obtaining the density of a refrigerant entering a throttling element according to the temperature of the indoor heat exchanger, the temperature of the outdoor heat exchanger, the discharge pressure of the compressor and the supercooling degree;
and obtaining the refrigerant flow value according to the compressor suction pressure, the compressor discharge pressure, the supercooling degree, the throttling element characteristic parameter and the refrigerant density, wherein the refrigerant flow value is calculated by the following formula under the refrigeration working condition of the air conditioner:
Figure FDA0003648446180000012
wherein q ismC0, c1, c2, c3 and c4 are fitting coefficients for the refrigerant flow value, PeFor the suction pressure of said compressor, PcThe discharge pressure of the compressor is A, the flow cross section area of a throttling element is A, rho is the density of the refrigerant, and delta T3 is the supercooling degree;
under the heating working condition of the air conditioner, the refrigerant flow value is calculated by the following formula:
Figure FDA0003648446180000021
wherein q ismC0, c1, c2, c3 and c4 are fitting coefficients for the refrigerant flow value, PeFor the suction pressure of said compressor, PcThe discharge pressure of the compressor is A, the flow cross section area of a throttling element is A, rho is the density of the refrigerant, and delta T6 is the supercooling degree;
and 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 exhaust enthalpy value and the supercooling enthalpy value.
2. The method of calculating energy efficiency of an air conditioner 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 frequency of a compressor, the rotating speed of an indoor fan, the rotating speed of an outdoor fan, the indoor environment temperature and the outdoor environment temperature, and acquiring the detection temperature of a first sensor of an indoor heat exchanger, the detection temperature of a second sensor of an outdoor heat exchanger, the detection temperature of a third sensor of an air suction port of the compressor and the detection temperature of a fourth sensor of an air exhaust port of the compressor;
correcting the temperature detected by the first sensor according to the compressor frequency, the indoor fan rotating speed and the indoor environment temperature to obtain an indoor heat exchanger temperature, and correcting the temperature detected by the second sensor, the temperature detected by the third sensor and the temperature detected by the fourth sensor according to the compressor frequency, the outdoor fan rotating speed and the outdoor environment temperature to obtain the outdoor heat exchanger temperature, the compressor suction temperature and the compressor discharge temperature respectively.
3. The method of calculating air conditioner capacity energy efficiency according to claim 2,
obtaining the indoor heat exchanger temperature by the following formula:
T1＝d1×T11+d2×d3×T6；
d1＝1-d2×d3；
d2＝Fr/1000；
d3＝F1/500；
wherein T1 is the indoor heat exchanger temperature, T11 is the first sensor detection temperature, T6 is the indoor environment temperature, d1, d2 and d3 are correction coefficients, and Fr is the compressor frequency; f1 is the indoor fan speed;
obtaining the outdoor heat exchanger temperature, the compressor suction temperature, and the compressor discharge temperature by the following equations:
Ti＝d1×Tn+d2×d4×T5；
d1＝1-d2×d3；
d2＝Fr/1000；
d4＝F2/500；
wherein, TnT12 is the second sensor detecting temperature and TiT2 is the outdoor heat exchanger temperature, ornT13 is the third sensor detecting temperature and Ti-T3 is the compressor suction temperature, ornT14 is the fourth sensor detects temperature and TiT4 is the compressor discharge temperature, T5 is the outdoor ambient temperature, d4 is the correction factor, and F2 is the outdoor fan speed.
4. The method for calculating the capacity and energy efficiency of the air conditioner according to claim 1, wherein under the refrigerating working condition of the air conditioner, the refrigerant flow value is obtained according to the indoor heat exchanger temperature, the outdoor heat exchanger temperature, the compressor suction pressure, the compressor discharge pressure, the supercooling degree and throttling element characteristic parameters, and the method comprises the following steps of:
obtaining the density of a refrigerant entering a throttling element according to the temperature of the outdoor heat exchanger, the discharge pressure of the compressor and the supercooling degree;
and obtaining the refrigerant flow value according to the compressor suction pressure, the compressor discharge pressure, the supercooling degree, the throttling element characteristic parameter and the refrigerant density.
5. The method for calculating the energy efficiency of the air conditioner according to claim 4, wherein the obtaining the density of the refrigerant entering the throttling element according to the temperature of the outdoor heat exchanger, the discharge pressure of the compressor and the supercooling degree comprises:
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 density of the refrigerant.
6. The method for calculating the capacity and the energy efficiency of the air conditioner according to claim 1, wherein under the heating working condition of the air conditioner, the refrigerant flow value is obtained according to the temperature of the indoor heat exchanger, the temperature of the outdoor heat exchanger, the suction pressure of the compressor, the discharge pressure of the compressor, the supercooling degree and the characteristic parameters of a throttling element, and the method comprises the following steps:
obtaining the density of a refrigerant entering a throttling element according to the temperature of the indoor heat exchanger, the discharge pressure of the compressor and the supercooling degree;
and obtaining the refrigerant flow value according to the compressor suction pressure, the compressor discharge pressure, the supercooling degree, the throttling element characteristic parameter and the refrigerant density.
7. The method for calculating the capacity energy efficiency of the air conditioner according to claim 6, wherein the obtaining of the density of the refrigerant entering the throttling element according to the temperature of the indoor heat exchanger, the discharge pressure of the compressor and the supercooling degree comprises:
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 density of the refrigerant.
8. 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.
9. 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 as recited in any one of claims 1-8 when the computer program is executed by the at least one processor.
10. 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 1-8.
11. An air conditioner, comprising:
the compressor, the indoor heat exchanger, the outdoor heat exchanger and the throttling element;
the first pressure sensor is used for collecting the exhaust pressure of the compressor;
the second pressure sensor is used for collecting the suction pressure of the compressor;
the first temperature sensor is arranged on a coil pipe of the indoor heat exchanger;
the second temperature sensor is arranged on a coil pipe of the outdoor heat exchanger;
a third temperature sensor provided 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 first pressure sensor, the second 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 8.
12. The air conditioner according to claim 11,
the air conditioner further comprises an indoor fan, an outdoor fan, a fifth temperature sensor and a sixth temperature sensor, wherein the indoor fan, the outdoor fan, the fifth temperature sensor and the sixth temperature sensor are all connected with the controller, the fifth temperature sensor is used for collecting outdoor environment temperature, and the sixth temperature sensor is used for collecting indoor environment temperature;
the controller is further used for obtaining the compressor frequency, the indoor fan rotating speed and the outdoor fan rotating speed, and correcting the detection temperature of the sensor according to the compressor frequency, the indoor fan rotating speed, the outdoor fan rotating speed, the indoor environment temperature and the indoor environment temperature.
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