CN111306697B - Debugging method of variable frequency air conditioner - Google Patents
Debugging method of variable frequency air conditioner Download PDFInfo
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- CN111306697B CN111306697B CN202010125628.XA CN202010125628A CN111306697B CN 111306697 B CN111306697 B CN 111306697B CN 202010125628 A CN202010125628 A CN 202010125628A CN 111306697 B CN111306697 B CN 111306697B
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- expansion valve
- valve opening
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- temperature
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/64—Electronic processing using pre-stored data
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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
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
- F24F11/83—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers
- F24F11/84—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers using valves
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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
- F24F11/70—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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2700/00—Sensing or detecting of parameters; Sensors therefor
- F25B2700/21—Temperatures
- F25B2700/2115—Temperatures of a compressor or the drive means therefor
- F25B2700/21152—Temperatures of a compressor or the drive means therefor at the discharge side of the compressor
Abstract
The invention relates to a debugging method of a variable frequency air conditioner, which comprises the following steps: the variable frequency air conditioner runs to a stable state at a preset frequency f; in the steady state, determining the actual exhaust temperature T0 and the corresponding expansion valve opening degree B0 of the inverter air conditioner; determining a target exhaust temperature Tt and a minimum expansion valve opening degree Bm of the inverter air conditioner based on the actual exhaust temperature T0 and a corresponding expansion valve opening degree B0; and controlling the inverter air conditioner based on the target exhaust temperature Tt and the minimum expansion valve opening Bm. The operation of the variable frequency air conditioner is controlled based on the target exhaust temperature Tt and the minimum expansion valve opening Bm, so that the problem that the exhaust temperature of the variable frequency air conditioner is too low or S-shaped fluctuation occurs can be avoided, and the normal operation of the variable frequency air conditioner can be ensured.
Description
Technical Field
The invention relates to a control method of an air conditioner, in particular to a debugging method of an inverter air conditioner.
Background
Air conditioners may be classified into a fixed frequency air conditioner and a variable frequency air conditioner. Both the fixed-frequency air conditioner and the variable-frequency air conditioner are provided with compressors, and the compressors are hearts of the air conditioners, and the rotating speed of the compressors directly influences the use efficiency of the air conditioners. The inverter air conditioner refers to an air conditioner additionally provided with an inverter, and the fixed-frequency air conditioner is not provided with the inverter. The inverter is a control system for controlling and adjusting the rotating speed of the compressor, so that the compressor is always in the optimal rotating speed state, and the energy efficiency ratio of the air conditioner can be improved. However, compared with the fixed-frequency air conditioner, the inverter air conditioner has more modules to be controlled, which results in more complicated control methods for various modules, and therefore, more factors which may affect the operation of the inverter air conditioner need to be considered in the debugging process of the inverter air conditioner, so as to ensure the inverter air conditioner to operate normally.
Before being produced in batches, the inverter air conditioners are usually subjected to performance debugging, one purpose is to ensure that the inverter air conditioners have no problem in operation, and the other purpose is to ensure that the inverter air conditioners meet relevant standards, such as rated power, rated refrigerating capacity, rated heating capacity and the like. For example, in order to provide energy efficiency identification, the inverter air conditioner generally needs to debug the APF project, that is, debug according to the standard and test method required by the APF project. Apf (annual Performance factor) refers to annual energy consumption rate, namely: in the cooling season and the heating season, the ratio of the total amount of heat removed from the room and the total amount of heat supplied to the room during cooling (heating) operation of the air conditioner to the total amount of electricity consumed during the same period is also called the annual energy efficiency ratio. At present, in debugging (including an APF project) of an inverter air conditioner, there are two main control modes adopted: firstly, the refrigeration adopts superheat degree control, and the heating adopts target exhaust temperature control; and secondly, the refrigeration and the heating are controlled by adopting the target exhaust temperature.
In particular, the first control mode requires the arrangement of thermocouples on the discharge line and on the return line of the compressor, respectively. The rated refrigeration of the inverter air conditioner needs to be adjusted according to the superheat degree (namely, the difference between the return air temperature of the compressor and the temperature of an evaporator coil), and the rated heating of the inverter air conditioner is adjusted by adopting the exhaust temperature of the compressor. When the rated refrigeration of the inverter air conditioner adopts superheat degree control, the return air temperature of the compressor is reasonable in theory due to uneven flow distribution of the evaporator, and the superheat degree is also proper, but the refrigeration capacity is poor. This problem is strongly related to the choice of superheat. The rated heating of the inverter air conditioner adopts the exhaust temperature control of the compressor, sometimes the exhaust temperature is late or S-shaped fluctuation occurs, and the phenomenon is also caused by unreasonable control mode.
The second control method is that the rated refrigeration and the heating are both controlled by adopting the target exhaust temperature, so that the rated refrigeration does not need to be controlled according to the superheat degree any more. Accordingly, the return air temperature sensor may be eliminated. Compared with superheat degree control, the method saves cost, but for low-frequency operation items, such as intermediate refrigeration, 25% refrigeration and the like, repeated fluctuation of the exhaust temperature is easy to occur, and the method is greatly related to the control of the opening degree of the electronic expansion valve. Relying solely on exhaust temperature control is also not comprehensive.
Accordingly, there is a need in the art for a new solution to the above problems.
Disclosure of Invention
In order to solve the above problems in the prior art, that is, to solve the technical problem that the control mode of the inverter air conditioner is not reasonable enough in the debugging process, the exhaust temperature is too low or S-shaped fluctuation occurs, the invention provides a debugging method of the inverter air conditioner, which comprises the following steps: the variable frequency air conditioner runs to a stable state at a preset frequency f; in the steady state, determining the actual exhaust temperature T0 and the corresponding expansion valve opening degree B0 of the inverter air conditioner; determining a target exhaust temperature Tt and a minimum expansion valve opening degree Bm of the inverter air conditioner based on the actual exhaust temperature T0 and a corresponding expansion valve opening degree B0; and controlling the inverter air conditioner based on the target exhaust temperature Tt and the minimum expansion valve opening Bm.
In a preferred technical solution of the debugging method of the inverter air conditioner, when the inverter air conditioner is operated at a high frequency, the inverter air conditioner is operated to a first stable state at a first predetermined high frequency f 1; in the first stable state, determining a first actual exhaust temperature T01 and a corresponding first expansion valve opening degree B01 of the inverter air conditioner; determining a first target exhaust gas temperature Tt1 and a first minimum expansion valve opening Bm1 of the inverter air conditioner based on the first actual exhaust gas temperature T01 and a corresponding first expansion valve opening B01; and controlling the inverter air conditioner based on the first target exhaust temperature Tt1 and a first minimum expansion valve opening Bm 1.
In a preferred embodiment of the commissioning method of the inverter air conditioner, the first target discharge temperature Tt1 is substantially the same as the first actual discharge temperature T01, and the first minimum expansion valve opening Bm1 is lower than the first expansion valve opening B01 by a first predetermined number of steps.
In a preferred embodiment of the commissioning method of the inverter air conditioner, in the step of controlling the inverter air conditioner based on the first target exhaust temperature Tt1 and the first minimum expansion valve opening Bm1, the commissioning method controls the inverter air conditioner to have the exhaust temperature of the inverter air conditioner close to the first target exhaust temperature Tt1 at the first target exhaust temperature Tt1, and then controls the inverter air conditioner at the first minimum expansion valve opening Bm 1.
In a preferred technical solution of the debugging method of the inverter air conditioner, when the inverter air conditioner operates at a low frequency, the inverter air conditioner operates to a second stable state at a second predetermined low frequency f 2; in the second stable state, determining a second actual exhaust temperature T02 and a corresponding second expansion valve opening degree B02 of the inverter air conditioner; determining a second target exhaust gas temperature Tt2 and a second minimum expansion valve opening Bm2 of the inverter air conditioner based on the second actual exhaust gas temperature T02 and a corresponding second expansion valve opening B02; and controlling the inverter air conditioner based on the second target exhaust temperature Tt2 and a second minimum expansion valve opening Bm 2.
In a preferred embodiment of the commissioning method of the inverter air conditioner, the second target discharge temperature Tt2 is higher than the second actual discharge temperature T02 by a predetermined degree, and the second minimum expansion valve opening Bm2 is higher than the second expansion valve opening B02 by a second predetermined number of steps.
In a preferred embodiment of the commissioning method of the inverter air conditioner, in the step of controlling the inverter air conditioner based on the second target discharge temperature Tt2 and a second minimum expansion valve opening Bm2, the commissioning method controls the inverter air conditioner to have the discharge temperature of the inverter air conditioner close to the second target discharge temperature Tt2 with the second minimum expansion valve opening Bm2, and then controls the inverter air conditioner with the second target discharge temperature Tt 2.
In a preferred technical solution of the commissioning method of the inverter air conditioner described above, when the inverter air conditioner is operating at a low frequency, operating to a third stable state at a third predetermined low frequency f3, wherein the third predetermined low frequency f3 is lower than the second predetermined low frequency f 2; in the third stable state, determining a third actual exhaust temperature T03 and a corresponding third expansion valve opening degree B03 of the inverter air conditioner; determining a third target exhaust gas temperature Tt3 and a third minimum expansion valve opening Bm3 of the inverter air conditioner based on the third actual exhaust gas temperature T03 and a corresponding third expansion valve opening B03; and controlling the inverter air conditioner based on the third target exhaust temperature Tt3 and a third minimum expansion valve opening Bm 3.
In a preferred embodiment of the commissioning method of the inverter air conditioner, the first minimum expansion valve opening Bm1> the second minimum expansion valve opening Bm2> the third minimum expansion valve opening Bm3, and the third minimum expansion valve opening Bm3 is selected as the minimum expansion valve opening Bm of the inverter air conditioner.
In a preferred embodiment of the commissioning method of the inverter air conditioner, in the step of controlling the inverter air conditioner based on the third target discharge temperature Tt3 and a third minimum expansion valve opening Bm3, the commissioning method controls the inverter air conditioner to have the discharge temperature of the inverter air conditioner close to the third target discharge temperature Tt3 with the third minimum expansion valve opening Bm3, and then controls the inverter air conditioner with the third target discharge temperature Tt 3.
As can be understood by those skilled in the art, in order to solve the technical problem that the exhaust temperature of the inverter air conditioner is too low or fluctuates in an S-type manner during the debugging process of the inverter air conditioner, according to the exhaust temperature and the corresponding opening degree of the expansion valve when the inverter air conditioner operates stably at a certain frequency, a target exhaust temperature Tt and a minimum opening degree Bm of the expansion valve of the inverter air conditioner are determined, and then the operation of the inverter air conditioner is controlled based on the target exhaust temperature Tt and the minimum opening degree Bm of the expansion valve, so that the problem that the exhaust temperature of the inverter air conditioner is too low or fluctuates in an S-type manner is avoided, and the inverter air conditioner can operate normally.
Preferably, when the inverter air conditioner operates at a high frequency, the inverter air conditioner is controlled by the first target exhaust temperature Tt1 until the exhaust temperature of the inverter air conditioner is close to the first target exhaust temperature Tt1, and then the inverter air conditioner is controlled by the first minimum expansion valve opening Bm 1. Since the discharge temperature of the inverter air conditioner rapidly rises at a high frequency, a control method in which the target discharge temperature is mainly controlled and the minimum expansion valve opening degree is secondarily controlled is suitably employed.
Preferably, when the inverter air conditioner is operated at a high frequency, the first minimum expansion valve opening degree Bm1 is set to be lower than the first expansion valve opening degree B01 by a first predetermined number of steps, thereby avoiding the problem that the expansion valve stops before the actual exhaust gas temperature reaches the target exhaust gas temperature, and avoiding the problem that the expansion valve frequently adjusts the opening degree to cause S-shaped fluctuation in the exhaust gas temperature.
Preferably, when the inverter air conditioner is operated at a low frequency (for example, the second or third low frequency f2, f3), since the exhaust gas temperature rises relatively slowly and the required expansion valve opening degree is relatively small, a control method is adopted in which the minimum expansion valve opening degree control is mainly used and the target exhaust gas temperature control is secondarily used. For example, the inverter air conditioner is controlled by the second minimum expansion valve opening Bm2 until the discharge temperature of the inverter air conditioner approaches the second target discharge temperature Tt2, and then the inverter air conditioner is controlled by the second target discharge temperature Tt 2. Or, the third minimum expansion valve opening degree Bm3 is used to control the inverter air conditioner until the exhaust temperature of the inverter air conditioner approaches the third target exhaust temperature Tt3, and then the third target exhaust temperature Tt3 is used to control the inverter air conditioner.
Preferably, at a low frequency, the target exhaust temperature and the minimum expansion valve opening degree of the inverter air conditioner should be higher than the corresponding exhaust temperature and the corresponding expansion valve opening degree when the inverter air conditioner is stably operated at the same frequency, so as to avoid the problem that the exhaust temperature cannot reach the target exhaust temperature and S-shaped fluctuation occurs. For example, the second target exhaust gas temperature Tt2 is higher than the second actual exhaust gas temperature T02 by a predetermined number of degrees, and the second minimum expansion valve opening degree Bm2 is higher than the second expansion valve opening degree B02 by a second predetermined number of steps.
Drawings
Preferred embodiments of the present invention are described below with reference to the accompanying drawings, in which:
FIG. 1 is a flow chart of a debugging method of an inverter air conditioner of the present invention;
FIG. 2 is a flow chart of a debugging method of the inverter air conditioner according to the first embodiment of the present invention;
FIG. 3 is a flow chart of a debugging method of the inverter air conditioner according to the second embodiment of the present invention;
fig. 4 is a flowchart of a debugging method of the inverter air conditioner according to the first embodiment of the present invention.
Detailed Description
Preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only for explaining the technical principle of the present invention, and are not intended to limit the scope of the present invention.
In order to solve the technical problem that the exhaust temperature is too low or S-shaped fluctuation occurs due to the fact that the existing debugging method of the inverter air conditioner is not suitable, the invention provides a debugging method of the inverter air conditioner, which comprises the following steps: the variable frequency air conditioner runs to a stable state at a preset frequency f; under a stable state, determining the actual exhaust temperature T0 of the inverter air conditioner and the corresponding opening degree B0 of the expansion valve; determining a target exhaust temperature Tt and a minimum expansion valve opening degree Bm of the inverter air conditioner based on the actual exhaust temperature T0 and the corresponding expansion valve opening degree B0; and controls the inverter air conditioner based on the target exhaust temperature Tt and the minimum expansion valve opening degree Bm.
The inverter air conditioner referred to herein includes both a cooling-only type air conditioner and a heat pump type air conditioner. During the debugging process, the operation of the inverter air conditioner at a high frequency generally refers to the operation of the inverter air conditioner under the working conditions of rated cooling, rated heating or fixed frequency and low temperature, and the operation at a low frequency generally refers to the operation of the inverter air conditioner under the working conditions of intermediate cooling, intermediate heating, 25% cooling or 25% heating. The expansion valve referred to herein may be an electronic expansion valve or other suitable expansion valve.
Fig. 1 is a flow chart of a debugging method of an inverter air conditioner of the invention. As shown in fig. 1, the debugging method of the inverter air conditioner of the present invention includes steps S1, S2, S3, and S4. In step S1, the inverter air conditioner is operated to a steady state at a predetermined frequency f. The predetermined frequency f may be a high frequency, for example, a frequency corresponding to a rated cooling, a rated heating or a rated low-temperature working condition of the inverter air conditioner; or may be a low frequency, such as a frequency corresponding to an operating condition of intermediate cooling, intermediate heating, 25% cooling, or 25% heating. When the inverter air conditioner is operated stably at the predetermined frequency f, the debugging method proceeds to step S2, where the actual discharge temperature T0 of the inverter air conditioner and the corresponding expansion valve opening degree B0 in units of steps are determined. In step S3, a target exhaust gas temperature Tt and a minimum expansion valve opening degree Bm of the inverter air conditioner are determined based on the actual exhaust gas temperature T0 and the corresponding expansion valve opening degree B0. In step S4, the inverter air conditioner is controlled based on the target exhaust temperature Tt and the minimum expansion valve opening degree Bm. The variable frequency air conditioner is controlled by the target exhaust temperature Tt and the minimum expansion valve opening Bm determined by the debugging method, so that the phenomenon that the exhaust temperature of the variable frequency air conditioner is too low or S-shaped fluctuation occurs in the operation process can be avoided. The debugging method of the invention can be used in an APF project test of the inverter air conditioner (but is not limited to the project test), not only can ensure the normal operation of the inverter air conditioner, but also can be used for determining the performance parameters of the inverter air conditioner, such as a target exhaust temperature corresponding to rated cooling/heating, a target exhaust temperature corresponding to intermediate cooling/heating, a target exhaust temperature corresponding to 25% cooling/heating, and the minimum expansion valve opening degree.
In the case of high-frequency operation, the target exhaust gas temperature Tt is the same as or substantially the same as the actual exhaust gas temperature T0; the minimum expansion valve opening degree Bm should be smaller than the corresponding expansion valve opening degree B0, for example, by 20 steps or more, and the specific value may be determined experimentally. The minimum expansion valve opening Bm must be determined, otherwise the exhaust gas temperature may not be present. For example, if the expansion valve opening is 150 steps when the exhaust gas temperature reaches the target exhaust gas temperature, the value Bm of the minimum expansion valve opening must be lower than 150 steps. If the minimum opening degree of the expansion valve is set to be greater than 150 steps, for example, 200 steps, the expansion valve stops when the opening degree reaches 200 steps, and the exhaust temperature is still far lower than the target exhaust temperature, so that the cooling or heating capability is poor. Similarly, when operating under the constant-frequency low-temperature condition, if the minimum expansion valve opening degree is set to be higher, the exhaust temperature is lower than the target exhaust temperature, and the capacity deviation is large. For example, if the minimum expansion valve opening is set to 150 steps, the discharge temperature of the inverter air conditioner is highly likely to fluctuate in an S-shape. In addition, due to the error of the thermocouple, the opening degree of the expansion valve is frequently adjusted to stabilize the exhaust temperature when the expansion valve reaches 150 steps, and the delay of the detection signal of the electronic valve is added, so that the expansion valve (for example, the electronic expansion valve) is easily opened and closed, and the exhaust temperature is easily fluctuated. Therefore, the minimum expansion valve opening degree needs to be set lower than the expansion valve opening degree corresponding to reaching the target exhaust gas temperature, for example, 20 steps lower.
Conversely, in the case of low-frequency operation, the target exhaust temperature Tt is higher than the actual exhaust temperature T0, for example by 10 ℃ or 20 ℃, and the specific values may also be determined experimentally; the minimum expansion valve opening degree Bm should be larger than the corresponding expansion valve opening degree B0, for example, by 20 steps, and the specific value may also be determined experimentally. Such a configuration can avoid a phenomenon in which the exhaust gas temperature does not reach the target exhaust gas temperature or S-shaped fluctuations occur.
Fig. 2 is a flowchart of a debugging method of an inverter air conditioner according to a first embodiment of the present invention. In this embodiment, the inverter air conditioner operates at a high frequency, such as a rated cooling, a rated heating, or a rated low temperature condition. As shown in fig. 2, in step S1a, the inverter air conditioner is operated to a first stable state at a first predetermined high frequency f 1. In step S2a, a first actual exhaust temperature T01 and a corresponding first expansion valve opening B01 of the inverter air conditioner are determined based on the first steady state. In step S3a, a first target discharge temperature Tt1 and a first minimum expansion valve opening degree Bm1 of the inverter air conditioner are determined based on the first actual discharge temperature T01 and the corresponding first expansion valve opening degree B01. Specifically, the first target exhaust gas temperature Tt1 is set to be the same as the first actual exhaust gas temperature T01, and the first minimum expansion valve opening degree Bm1 is lower than the first expansion valve opening degree B01 by a first predetermined number of steps, for example, 20 steps or more. Alternatively, the first predetermined number of steps may be determined experimentally. In step S4a, the inverter air conditioner is controlled by the first target discharge temperature Tt1 until the discharge temperature of the inverter air conditioner approaches or reaches the first target discharge temperature Tt1, and then controlled by the first minimum expansion valve opening Bm 1. An example of operation of the inverter air conditioner under a rated cooling condition (high frequency operation) is provided below.
Example 1
The inverter air conditioner operates under a rated refrigerating condition, and the corresponding first preset high frequency f1 is 63 Hz. When the inverter air conditioner operates stably, the refrigerating capacity and the power of the inverter air conditioner meet the requirements. In this steady state, the first actual discharge temperature T01 of the inverter air conditioner is 82 ℃, and the first expansion valve opening degree B01 of the electronic expansion valve is 320 steps. The first target exhaust gas temperature Tt1 is set to be the same as the first actual exhaust gas temperature T01, that is, Tt1 is 82 ℃, and the first minimum expansion valve opening degree Bm1 of the electronic expansion valve needs to be lower than the first expansion valve opening degree B01, which is temporarily 120 steps, that is, Bm1 is 120. When the frequency conversion air conditioner runs at high frequency, the exhaust temperature of the frequency conversion air conditioner is heated up quickly, and the target exhaust temperature can be reached completely and quickly. Therefore, in this high frequency operation, the target exhaust gas temperature control is mainly used, and the minimum expansion valve opening degree control is used as an auxiliary means. For example, the inverter air conditioner is controlled at the first target discharge temperature Tt1 equal to 82 ℃, and when the discharge temperature of the inverter air conditioner approaches or reaches 82 ℃, fine adjustment is performed in steps based on the first minimum expansion valve opening Bm1 equal to 120.
Fig. 3 is a flowchart of a debugging method of an inverter air conditioner according to a second embodiment of the present invention. In this embodiment, the inverter air conditioner operates at a low frequency, such as an intermediate cooling or intermediate heating condition. As shown in fig. 3, in step S1b, the inverter air conditioner is operated to a second stable state at a second predetermined low frequency f 2. In step S2B, a second actual exhaust temperature T02 and a corresponding second expansion valve opening B02 of the inverter air conditioner are determined based on the second steady state. In step S3B, a second target exhaust gas temperature Tt2 and a second minimum expansion valve opening Bm2 of the inverter air conditioner are determined based on the second actual exhaust gas temperature T02 and the corresponding second expansion valve opening B02. Specifically, the second target exhaust gas temperature Tt2 is set higher than the second actual exhaust gas temperature T02 by a predetermined number of degrees, for example, 10 ℃ or 20 ℃, and the second minimum expansion valve opening Bm2 is higher than the second expansion valve opening B02 by a second predetermined number of steps, for example, 20 steps or more. Therefore, S-shaped fluctuation of the exhaust temperature can be avoided, and overhigh exhaust temperature can be avoided. Alternatively, both the predetermined number of degrees and the second predetermined number of steps may be determined experimentally. In step S4b, the inverter air conditioner is controlled by the second minimum expansion valve opening Bm2 until the discharge temperature of the inverter air conditioner approaches or reaches the second target discharge temperature Tt2, and then controlled by the second target discharge temperature Tt 2. This case may be regarded as mainly the minimum expansion valve opening degree control and as secondarily the target exhaust gas temperature control. An example of operation of the inverter air conditioner at an intermediate cooling condition (low frequency operation) is provided below.
Example two
The inverter air conditioner operates under the intermediate refrigeration working condition, and the corresponding second preset low frequency f2 is 21 Hz. When the inverter air conditioner operates stably, the refrigerating capacity and the power of the inverter air conditioner meet the requirements. In the stable operation state, the second actual exhaust temperature T02 of the inverter air conditioner is 62 ℃, and the second expansion valve opening degree B02 of the electronic expansion valve is 80 steps. Since the exhaust gas temperature is slowly increased in the low frequency operation, in order to quickly reach the target exhaust gas temperature and to ensure that the exhaust gas temperature is not excessively high, the second minimum expansion valve opening Bm2 of the electronic expansion valve is determined to be 20 steps more than the number of steps of the second expansion valve opening B02, that is, Bm2 is 100. In addition, to avoid S-shaped fluctuations in the exhaust gas temperature, the target exhaust gas temperature Tt2 is at least 20 ℃ higher than the second actual exhaust gas temperature T02, i.e., T2 ≧ 82 ℃. Then, the inverter air conditioner is controlled mainly by the second minimum expansion valve opening Bm2 and secondarily by the second target discharge temperature Tt 2.
Fig. 4 is a flowchart of a debugging method of the inverter air conditioner according to a third embodiment of the present invention. In this embodiment, the inverter air conditioner operates at a lower frequency than the second predetermined low frequency f2, for example, at a condition of 25% cooling or 25% intermediate heating. As shown in fig. 3, in step S1c, the inverter air conditioner is operated to a third stable state at a third predetermined low frequency f 3. In step S2c, a third actual exhaust temperature T03 and a corresponding third expansion valve opening B03 of the inverter air conditioner are determined based on the third steady state. In step S3c, a third target exhaust gas temperature Tt3 and a third minimum expansion valve opening Bm3 of the inverter air conditioner are determined based on the third actual exhaust gas temperature T03 and the corresponding third expansion valve opening B03. Specifically, the third target exhaust gas temperature Tt3 is set higher than the third actual exhaust gas temperature T03 by a predetermined number of degrees, for example, 10 ℃ or 20 ℃, and the third minimum expansion valve opening Bm3 is higher than the third expansion valve opening B03 by a second predetermined number of steps, for example, 20 steps or more. Therefore, S-shaped fluctuation of the exhaust temperature can be avoided, and overhigh exhaust temperature can be avoided. Alternatively, both the predetermined number of degrees and the second predetermined number of steps may be determined experimentally. In step S4c, the inverter air conditioner is controlled by the third minimum expansion valve opening Bm3 until the discharge temperature of the inverter air conditioner approaches or reaches the third target discharge temperature Tt3, and then controlled by the third target discharge temperature Tt 3. This case may be regarded as mainly the minimum expansion valve opening degree control and as secondarily the target exhaust gas temperature control. An example of the inverter air conditioner operating at 25% cooling (low frequency operation) is provided below.
Example three
The inverter air conditioner operates under the 25% refrigeration condition, and the corresponding third preset low frequency f3 is 13 Hz. In the existing air conditioner market, only a part of inverter air conditioners can operate under 25% cooling or heating working conditions, such as 3P inverter air conditioners. When the inverter air conditioner runs stably, the refrigerating capacity and the power of the inverter air conditioner meet the requirements, the third actual exhaust temperature T03 can be determined to be 58 ℃, and the corresponding opening degree B03 of the third expansion valve is 60 steps. In order to quickly reach the target exhaust gas temperature without causing the exhaust gas temperature to be excessively high, the third minimum expansion valve opening degree Bm3 of the electronic expansion valve is temporarily set to 80 steps higher than the third expansion valve opening degree B03 by 20 steps. In addition, in order to avoid S-shaped fluctuations in the exhaust gas temperature, the target exhaust gas temperature Tt3 is set to be at least 20 ℃ higher than the third actual exhaust gas temperature T03, i.e., T3 ≧ 78 ℃. Then, the inverter air conditioner is controlled mainly by the third minimum expansion valve opening degree Bm3 and secondarily by the third target discharge temperature Tt 3.
In the above-described embodiment of the commissioning method of the inverter air conditioner of the present invention, the first target exhaust gas temperature Tm1, the second target exhaust gas temperature Tm2, the third target exhaust gas temperature Tm3, the first minimum expansion valve opening degree Bm1, the second minimum expansion valve opening degree Bm2, and the third minimum expansion valve opening degree Bm3 are determined, wherein Bm1> Bm2> Bm 3. For an inverter air conditioner (such as a 2p inverter air conditioner) without 25% cooling/heating operation condition, the minimum expansion valve opening degree is selected between Bm1 and Bm2, the smaller is selected, and the target exhaust temperature is selected from Tm1 and Tm2, so that the final parameters of the inverter air conditioner can be determined as Tm1, Tm2 and Bm 2. For an inverter air conditioner (such as a 3P inverter air conditioner) with 25% cooling/heating operation condition, the minimum expansion valve opening degree is selected according to Bm1, Bm2 and Bm3, the smaller one is selected, and the target exhaust temperature is selected from Tm1, Tm2 and Tm3, so that the final parameters of the inverter air conditioner are determined as Tm1, Tm2, Tm3 and Bm 3.
So far, the technical solutions of the present invention have been described in connection with the preferred embodiments shown in the drawings, but it is easily understood by those skilled in the art that the scope of the present invention is obviously not limited to these specific embodiments. Equivalent changes or substitutions of related technical features can be made by those skilled in the art without departing from the principle of the invention, and the technical scheme after the changes or substitutions can fall into the protection scope of the invention.
Claims (10)
1. A debugging method of an inverter air conditioner is characterized by comprising the following steps:
the variable frequency air conditioner runs to a stable state at a preset frequency f;
in the steady state, determining the actual exhaust temperature T0 and the corresponding expansion valve opening degree B0 of the inverter air conditioner;
determining a target exhaust temperature Tt and a minimum expansion valve opening degree Bm of the inverter air conditioner based on the actual exhaust temperature T0 and a corresponding expansion valve opening degree B0; and is
Controlling the inverter air conditioner based on the target exhaust temperature Tt and a minimum expansion valve opening Bm, wherein,
when the inverter air conditioner is operated at a high frequency, the target discharge air temperature Tt is the same as the actual discharge air temperature T0, and the minimum expansion valve opening degree Bm is less than the corresponding expansion valve opening degree B0;
when the inverter air conditioner is operated at a low frequency, the target discharge air temperature Tt is higher than the actual discharge air temperature T0, and the minimum expansion valve opening degree Bm is greater than the corresponding expansion valve opening degree B0.
2. The debugging method of an inverter air conditioner according to claim 1, characterized in that when the inverter air conditioner is operated at a high frequency, it is operated to a first steady state at a first predetermined high frequency f 1;
in the first stable state, determining a first actual exhaust temperature T01 and a corresponding first expansion valve opening degree B01 of the inverter air conditioner;
determining a first target exhaust gas temperature Tt1 and a first minimum expansion valve opening Bm1 of the inverter air conditioner based on the first actual exhaust gas temperature T01 and a corresponding first expansion valve opening B01; and is
And controlling the inverter air conditioner based on the first target exhaust temperature Tt1 and a first minimum expansion valve opening Bm 1.
3. The tuning method of an inverter air conditioner according to claim 2, wherein the first target discharge temperature Tt1 is the same as the first actual discharge temperature T01, and the first minimum expansion valve opening degree Bm1 is lower than the first expansion valve opening degree B01 by a first predetermined number of steps.
4. The method for commissioning an inverter air conditioner according to claim 2, wherein in the step of controlling the inverter air conditioner based on the first target discharge temperature Tt1 and a first minimum expansion valve opening Bm1, the method controls the inverter air conditioner at the first target discharge temperature Tt1 until the discharge temperature of the inverter air conditioner approaches the first target discharge temperature Tt1, and then controls the inverter air conditioner at the first minimum expansion valve opening Bm 1.
5. The debugging method of an inverter air conditioner according to claim 2, characterized in that when the inverter air conditioner is operated at a low frequency, it is operated to a second steady state at a second predetermined low frequency f 2;
in the second stable state, determining a second actual exhaust temperature T02 and a corresponding second expansion valve opening degree B02 of the inverter air conditioner;
determining a second target exhaust gas temperature Tt2 and a second minimum expansion valve opening Bm2 of the inverter air conditioner based on the second actual exhaust gas temperature T02 and a corresponding second expansion valve opening B02; and is
And controlling the inverter air conditioner based on the second target exhaust temperature Tt2 and a second minimum expansion valve opening Bm 2.
6. The tuning method of an inverter air conditioner according to claim 5, wherein the second target discharge temperature Tt2 is higher than the second actual discharge temperature T02 by a predetermined degree, and the second minimum expansion valve opening Bm2 is higher than the second expansion valve opening B02 by a second predetermined number of steps.
7. The method for commissioning an inverter air conditioner according to claim 5, wherein in the step of controlling the inverter air conditioner based on the second target discharge temperature Tt2 and a second minimum expansion valve opening Bm2, the method controls the inverter air conditioner with the second minimum expansion valve opening Bm2 until the discharge temperature of the inverter air conditioner approaches the second target discharge temperature Tt2, and then controls the inverter air conditioner with the second target discharge temperature Tt 2.
8. The debugging method of an inverter air conditioner according to claim 5, wherein when the inverter air conditioner is operating at a low frequency, operating to a third stable state at a third predetermined low frequency f3, wherein the third predetermined low frequency f3 is lower than the second predetermined low frequency f 2;
in the third stable state, determining a third actual exhaust temperature T03 and a corresponding third expansion valve opening degree B03 of the inverter air conditioner;
determining a third target exhaust gas temperature Tt3 and a third minimum expansion valve opening Bm3 of the inverter air conditioner based on the third actual exhaust gas temperature T03 and a corresponding third expansion valve opening B03; and is
And controlling the inverter air conditioner based on the third target exhaust temperature Tt3 and a third minimum expansion valve opening Bm 3.
9. The debugging method of an inverter air conditioner according to claim 8, wherein the first minimum expansion valve opening Bm1> the second minimum expansion valve opening Bm2> the third minimum expansion valve opening Bm3, and the third minimum expansion valve opening Bm3 is selected as the minimum expansion valve opening Bm of the inverter air conditioner.
10. The method for commissioning an inverter air conditioner according to claim 8, wherein in the step of controlling said inverter air conditioner based on said third target discharge temperature Tt3 and a third minimum expansion valve opening Bm3, said commissioning method controls said inverter air conditioner with said third minimum expansion valve opening Bm3 until the discharge temperature of said inverter air conditioner approaches said third target discharge temperature Tt3, and then controls said inverter air conditioner with said third target discharge temperature Tt 3.
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