Air conditioner

Abstract

According to the air conditioner, the maximum operation frequency is preset, test running is carried out when the air conditioner runs for the first time after installation is completed, piping parameters of the air conditioner are determined in the test running process, and the actual maximum operation frequency of a compressor reaching the air conditioner matching number is determined according to the piping parameters and the preset maximum operation frequency; the actual maximum operation frequency is written into a storage module, the actual maximum operation frequency serves as the upper limit operation frequency of the compressor, and the actual maximum frequency of the compressor is the frequency capable of reaching the nominal air conditioner piconumber when the actual maximum frequency is matched with the piping parameters of the air conditioner after actual installation; the problems that the capacity of the air conditioner is attenuated due to pressure loss caused by the factors such as the length of the piping and the height difference, and the nominal power cannot be reached within the preset maximum operation frequency range are solved.

Description

Technical Field

[0001] This invention relates to the field of air conditioning system technology, and in particular to an air conditioner that can adapt to different piping lengths. Background Technology

[0002] The capacity of an air conditioner is determined at the factory, which means that the maximum operating frequency of the compressor is also determined. The compressor can only operate below the maximum operating frequency. The maximum frequency of the compressor is designed when the piping length is the standard length.

[0003] However, air conditioner piping lengths vary significantly depending on the installation environment. This is especially true in multi-split air conditioning heat pump units, where the large capacity of the outdoor unit often leads to excessively long piping between the indoor and outdoor units. Even more challenging are installations in high-rise buildings or shopping malls where the outdoor and indoor units, as well as between indoor and outdoor units, are not on the same plane, resulting in height differences. These piping length and height differences cause excessive refrigerant pressure loss, leading to lower refrigerant pressure and density at the compressor's suction port. Consequently, at the same compressor frequency, this results in a lower refrigerant mass flow rate, reduced system cooling (heating) capacity, and a decrease in the unit's overall capacity. At maximum operating frequency, the unit may not reach its rated horsepower.

[0004] The information disclosed in this background section is only intended to enhance the understanding of the background technology of this application, and therefore may include prior art that is not known to those skilled in the art. Summary of the Invention

[0005] This invention proposes an air conditioner that solves the technical problem that existing air conditioners suffer from capacity attenuation due to varying pressure losses caused by the installation environment, resulting in their inability to reach the rated horsepower when operating at maximum frequency.

[0006] To achieve the above-mentioned objectives, the present invention employs the following technical solution:

[0007] An air conditioner, comprising:

[0008] compressor;

[0009] The storage module stores the preset maximum operating frequency of the compressor corresponding to the air conditioner's horsepower, and the preset maximum operating frequency of the compressor serves as the upper limit frequency of the compressor; its characteristic is that...

[0010] The controller is configured to control the air conditioner to perform a trial run when it is first run after installation, determine the air conditioner's piping parameters, determine the actual maximum operating frequency of the compressor to reach the air conditioner's horsepower based on the piping parameters and the preset maximum operating frequency, write the actual maximum operating frequency into the storage module, and use the actual maximum operating frequency as the compressor's upper limit operating frequency.

[0011] The above technical solution has the following advantages or beneficial effects: When the air conditioner is first run after installation, a trial run is performed. During the trial run, the piping parameters of the air conditioner are determined. Based on the piping parameters and the preset maximum operating frequency, the actual maximum operating frequency of the compressor to reach the air conditioner's horsepower is determined. The actual maximum operating frequency is written into the storage module and used as the upper limit operating frequency of the compressor. The actual maximum frequency of the compressor is the frequency that can reach the nominal air conditioner horsepower when adapted to the piping parameters after the actual installation of the air conditioner. This avoids the problem of pressure loss caused by factors such as piping length and height difference, which leads to the reduction of the air conditioner's capacity and the inability to reach the nominal horsepower within the preset maximum operating frequency range.

[0012] In some embodiments, the storage module stores a number of piping parameters or the maximum frequency correction value corresponding to a range of piping parameters;

[0013] The controller is configured to determine the maximum frequency correction value based on the piping parameters, and then correct the preset maximum operating frequency using the maximum frequency correction value to obtain the actual maximum operating frequency.

[0014] Alternatively, the storage module stores the correspondence between the actual maximum operating frequency and the piping parameters and the preset maximum operating frequency;

[0015] The controller is configured to obtain the actual maximum operating frequency based on the piping parameters and their corresponding relationships.

[0016] The above technical solution has the following advantages or beneficial effects: the maximum frequency correction value corresponding to the piping parameters is determined in advance, and the preset maximum operating frequency is corrected according to the maximum frequency correction value; or, the correspondence between the actual maximum operating frequency and the piping parameters and the preset maximum operating frequency is determined in advance, and the actual maximum operating frequency is obtained according to the piping parameters and the correspondence. The actual maximum operating frequency can be determined quickly, making the determination of the actual maximum operating frequency more standardized, regulated and accurate.

[0017] In some embodiments, the storage module stores a preset compressor start frequency;

[0018] The controller is configured to determine the actual starting frequency of the compressor based on the piping parameters and the preset starting frequency, and control the compressor to start at the actual starting frequency.

[0019] The above technical solution has the following advantages or beneficial effects: adjusting the actual starting frequency of the compressor according to the piping parameters can improve the reliability and responsiveness of the air conditioner.

[0020] In some embodiments, the storage module stores a number of piping parameters or a range of piping parameters corresponding to the start-up frequency correction value;

[0021] The controller is configured to determine the start-up frequency correction value based on the piping parameters, and then correct the preset start-up frequency using the start-up frequency correction value to obtain the actual start-up frequency;

[0022] Alternatively, the storage module stores the correspondence between the actual start frequency and the piping parameters and the preset start frequency;

[0023] The controller is configured to obtain the actual start-up frequency based on the piping parameters and their corresponding relationships.

[0024] The above technical solution has the following advantages or beneficial effects: the starting frequency correction value corresponding to the piping parameters is determined in advance, and the preset starting frequency is corrected according to the starting frequency correction value; or, the correspondence between the actual starting frequency and the piping parameters and the preset starting frequency is determined in advance, and the actual starting frequency is obtained according to the piping parameters and the correspondence. The actual starting frequency can be determined quickly, making the determination of the actual starting frequency more standardized, regulated and accurate.

[0025] In some embodiments, the air conditioner includes:

[0026] Expansion valve;

[0027] The storage module stores the preset start-up opening of the expansion valve;

[0028] The controller is configured to determine the actual starting opening of the expansion valve based on the piping parameters and the preset starting opening, and control the expansion valve to start according to the actual starting opening.

[0029] The above technical solution has the following advantages or beneficial effects: adjusting the actual starting opening of the expansion valve according to the piping parameters can improve the reliability and responsiveness of the air conditioner.

[0030] In some embodiments, the storage module stores several piping parameters or piping parameter ranges corresponding to opening correction values;

[0031] The controller is configured to determine the opening correction value based on the piping parameters, and then correct the preset starting opening value to obtain the actual starting opening.

[0032] Alternatively, the storage module stores the correspondence between the actual start-up opening degree and the piping parameters and the preset start-up opening degree;

[0033] The controller is configured to obtain the actual start-up opening degree based on the piping parameters and their corresponding relationships.

[0034] The above technical solution has the following advantages or beneficial effects: the opening correction value corresponding to the piping parameters is determined in advance, and the preset start-up opening is corrected according to the opening correction value; or, the correspondence between the actual start-up opening and the piping parameters and the preset start-up opening is determined in advance, and the actual start-up opening is obtained according to the piping parameters and the correspondence. The actual start-up opening can be determined quickly, making the determination of the actual start-up opening more standardized, regulated and accurate.

[0035] In some embodiments, the controller is configured to maintain the trial run for at least a set time, during which all indoor units operate simultaneously and at the compressor's preset maximum operating frequency.

[0036] The above technical solution has the following advantages or beneficial effects: by setting up a trial operation process and performing the same control during the trial operation, the determination of piping parameters can be made under the same conditions, thereby improving the accuracy of the determination of piping parameters.

[0037] In some embodiments, the controller is configured to obtain operating parameters after a period of time following the start of trial operation to determine the piping parameters of the air conditioner.

[0038] The above technical solution has the following advantages or beneficial effects: monitoring the operating parameters after the trial operation is stable, and determining the air conditioner's piping parameters based on the operating parameters during the stable operation process, can further improve the accuracy of the piping parameter determination.

[0039] In some embodiments, the air conditioner includes a cooling test run or a heating test run;

[0040] During the refrigeration test run, the air conditioner includes:

[0041] Indoor unit liquid pipe temperature detection module, used to detect the temperature of the indoor unit liquid pipe;

[0042] Inspiratory pressure detection module, used to detect inspiratory pressure;

[0043] The controller is configured to calculate the evaporation pressure based on the indoor unit's liquid pipe temperature. The refrigeration piping parameters are as follows:

[0044] (evaporation pressure - intake pressure) / turbulent pressure drop;

[0045] Alternatively, (evaporation pressure - intake pressure) ＊ Evaporation pressure / (Preset maximum frequency) 2＊ (Intake-side refrigerant density);

[0046] Alternatively, (evaporation pressure - intake pressure) ＊ Evaporation pressure / Preset maximum frequency 2 ;

[0047] Alternatively, (evaporation pressure - intake pressure)＊ Inhalation pressure / preset maximum frequency 2 ;

[0048] Alternatively, (evaporation pressure - intake pressure) ＊ (Evaporation pressure + Intake pressure) / Preset maximum frequency 2 ;

[0049] During the heating test run, the air conditioner includes:

[0050] Indoor unit coil temperature detection module, used to detect the temperature of the indoor unit coil;

[0051] Inspiratory pressure detection module, used to detect inspiratory pressure;

[0052] Exhaust pressure detection module, used to detect exhaust pressure;

[0053] The controller is configured to calculate the condensing pressure based on the indoor unit coil temperature. The heating piping parameters are as follows:

[0054] (Exhaust pressure - Condensation pressure) / Turbulent pressure drop;

[0055] Alternatively, (exhaust pressure - condensation pressure) / (preset maximum frequency) 2＊ Intake side refrigerant density 2 / Exhaust side refrigerant density);

[0056] Alternatively, (exhaust pressure - condensation pressure) * intake pressure 2 / (Preset maximum frequency) 2＊ (exhaust pressure);

[0057] Alternatively, (exhaust pressure - condensation pressure) * intake pressure 2 / (Preset maximum frequency) 2＊ (condensation pressure);

[0058] Alternatively, (exhaust pressure - condensation pressure) ＊ Inhalation pressure 2 / (Preset maximum frequency) 2＊ (Condensing pressure + Discharge pressure)

[0059] The above technical solution has the following advantages or beneficial effects: the trial operation process may be in cooling mode or heating mode. Therefore, the calculation method of the air conditioner piping parameters is determined separately for cooling mode and heating mode to facilitate the accuracy of piping parameter calculation.

[0060] In some embodiments, the controller is configured to, upon receiving a heating mode control signal, control the air conditioner to perform a heating test run to obtain heating piping parameters and determine the actual maximum frequency based on the heating piping parameters; and upon receiving a cooling mode control signal, control the air conditioner to perform a cooling test run to obtain cooling piping parameters and determine the actual maximum frequency based on the cooling piping parameters.

[0061] Alternatively, the controller is configured to control the air conditioner to undergo trial operation upon receiving a trial operation control signal.

[0062] The above technical solution has the following advantages or beneficial effects: the air conditioner does not require a test run control button; it can automatically enter test run mode simply by starting the air conditioner in cooling or heating mode, determining the piping parameters, and then, after determining the actual maximum frequency based on the piping parameters, the test run ends and the air conditioner directly enters the required mode, avoiding cumbersome operation for the user. Alternatively, a test run control button can be provided to control the start of the test run process, thereby improving the user's understanding of the air conditioner's functions.

[0063] Other features and advantages of the present invention will become clearer after reading the detailed embodiments of the invention in conjunction with the accompanying drawings. Attached Figure Description

[0064] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0065] Figure 1 This is a diagram of the refrigerant circulation system in the cooling mode of an air conditioner according to an embodiment;

[0066] Figure 2 This is a diagram of the refrigerant circulation system in the heating mode of an air conditioner according to an embodiment;

[0067] Figure 3 This is a schematic block diagram of an air conditioner according to an embodiment;

[0068] Figure 4 A flowchart for determining the actual maximum frequency of the compressor according to the embodiment;

[0069] Figure 5 Flowchart for determining compressor start frequency according to an embodiment;

[0070] Figure 6 This is a flowchart illustrating the process of determining the starting opening degree of the expansion valve according to an embodiment.

[0071] Figure 7This is a flowchart for determining air conditioning piping parameters during trial operation in cooling mode according to an embodiment.

[0072] Figure 8 This is a flowchart for determining air conditioning piping parameters during trial operation in heating mode according to an embodiment.

[0073] Figure 9 This is a control flowchart of an air conditioner according to an embodiment;

[0074] Figure 10 This is a control flowchart for an air conditioner according to another embodiment.

[0075] In the picture:

[0076] 101. Outdoor unit;

[0077] 201. First indoor unit;

[0078] 202. Second indoor unit;

[0079] 1. Compressor;

[0080] 3. Gas-liquid separator;

[0081] 4. Four-way valve;

[0082] 5. Outdoor heat exchanger;

[0083] 6. Outdoor electronic expansion valve;

[0084] 8a. First indoor electronic expansion valve;

[0085] 9a. First indoor heat exchanger;

[0086] 8b. Second indoor electronic expansion valve;

[0087] 9b. Second indoor heat exchanger. Detailed Implementation

[0088] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0089] In the description of this application, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0090] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0091] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal conduction of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0092] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0093] The following disclosure provides many different embodiments or examples for implementing various structures of the invention. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the invention. Furthermore, reference numerals or letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments or arrangements discussed. In addition, examples of various specific processes and materials are provided in this invention, but those skilled in the art will recognize the application of other processes or the use of other materials.

[0094] Air conditioning units execute a refrigeration cycle using a compressor, condenser, throttling device, and evaporator. The refrigeration cycle involves a series of processes, including compression, condensation, expansion, and evaporation, to cool or heat an indoor space.

[0095] Low-temperature, low-pressure refrigerant enters the compressor, which compresses it into a high-temperature, high-pressure refrigerant gas and discharges the compressed refrigerant gas. The discharged refrigerant gas flows into the condenser. The condenser condenses the compressed refrigerant into a liquid phase, and the heat is released to the surrounding environment through the condensation process.

[0096] The throttling device expands the high-temperature, high-pressure liquid refrigerant that condenses in the condenser into a low-pressure liquid refrigerant. The evaporator evaporates the expanded refrigerant in the throttling device, returning the low-temperature, low-pressure refrigerant gas to the compressor. The evaporator achieves its cooling effect by utilizing the latent heat of refrigerant evaporation to exchange heat with the material being cooled. Throughout the cycle, the air conditioner regulates the temperature of the indoor space.

[0097] The outdoor unit of an air conditioner refers to the part of the refrigeration cycle that includes the compressor and the outdoor heat exchanger. The indoor unit of an air conditioner includes the indoor heat exchanger, and a throttling device can be provided in either the indoor or outdoor unit.

[0098] The indoor and outdoor heat exchangers function as either condensers or evaporators. When the indoor heat exchanger is used as a condenser, the air conditioner functions as a heater in heating mode; when the indoor heat exchanger is used as an evaporator, the air conditioner functions as a cooler in cooling mode.

[0099] An air conditioner includes a refrigerant circulation system, a storage module, and a controller.

[0100] The refrigerant circulation system includes compressor 1.

[0101] The storage module stores the preset maximum operating frequency of the compressor corresponding to the air conditioner's horsepower. The preset maximum operating frequency of the compressor serves as the upper limit frequency of the compressor, and the compressor operates within a frequency range lower than the preset maximum operating frequency. The preset maximum operating frequency of the compressor corresponds to the horsepower of the air conditioner under normal installation conditions (pressure loss caused by piping length, height difference, etc. is within the normal range).

[0102] The controller is configured to perform a trial run of the air conditioner upon its initial installation and initial operation, determine the air conditioner's piping parameters, and, based on these parameters and a preset maximum operating frequency, determine the actual maximum operating frequency of the compressor to achieve the desired air conditioning capacity. This actual maximum operating frequency is then written into a storage module and serves as the compressor's upper limit frequency. The compressor operates within a frequency range lower than the actual maximum frequency. For air conditioner operating parameters involving the upper limit frequency, control is based on the actual maximum operating frequency.

[0103] When the air conditioner is first run after installation, a trial run is conducted. During the trial run, the actual piping parameters of the air conditioner are determined. Based on the actual piping parameters and the preset maximum operating frequency, the actual maximum operating frequency of the compressor to achieve the air conditioner's horsepower is determined. The actual maximum operating frequency is written into the storage module and used as the upper limit operating frequency of the compressor. The actual maximum frequency of the compressor is the frequency that can achieve the nominal air conditioner horsepower when adapted to the actual piping parameters after the air conditioner is actually installed. Running at this actual maximum frequency can achieve the nominal air conditioner horsepower, avoiding the problem of pressure loss caused by factors such as piping length and height difference, which would lead to the air conditioner's capacity reduction and the inability to achieve the nominal horsepower within the preset maximum operating frequency range.

[0104] exist Figure 1 , Figure 2 , Figure 3 In the example, the air conditioner is a multi-split air conditioner, which includes an outdoor unit 101, a first indoor unit 201, and a second indoor unit 202.

[0105] The outdoor unit 101 includes a compressor 1, a low-pass valve 4, an outdoor heat exchanger 5, an outdoor electronic expansion valve 6, and a gas-liquid separator 3.

[0106] An exhaust pressure detection module is installed at the exhaust end of compressor 1 to detect the exhaust pressure Pd.

[0107] A suction pressure detection module is installed at the suction end of compressor 1 to detect the suction pressure Ps.

[0108] The first indoor unit 201 includes a first indoor electronic expansion valve 8a and a first indoor heat exchanger 9a.

[0109] The second indoor unit 202 includes a second indoor electronic expansion valve 8b and a first indoor heat exchanger 9b.

[0110] The indoor unit is equipped with an indoor unit coil temperature detection module to detect the indoor unit coil temperature.

[0111] The first indoor unit 201 is equipped with a first indoor unit coil temperature detection module, which is used to detect the first indoor unit coil temperature Tr1.

[0112] The second indoor unit 202 is equipped with a second indoor unit coil temperature detection module, which is used to detect the second indoor unit coil temperature Tr2.

[0113] The indoor unit is equipped with an indoor unit liquid pipe temperature detection module, which is used to detect the temperature of the indoor unit liquid pipe.

[0114] The first indoor unit 201 is equipped with a first indoor unit liquid pipe temperature detection module, which is used to detect the first indoor unit liquid pipe temperature Trl1.

[0115] The second indoor unit 202 is equipped with a second indoor unit liquid pipe temperature detection module, which is used to detect the second indoor unit liquid pipe temperature Trl1.

[0116] In some embodiments, the storage module stores a number of piping parameters or the maximum frequency correction value corresponding to a range of piping parameters;

[0117] The controller is configured to determine the maximum frequency correction value based on the piping parameters, and then correct the preset maximum operating frequency using the maximum frequency correction value to obtain the actual maximum operating frequency.

[0118] By pre-determining the maximum frequency correction value corresponding to the piping parameters and correcting the preset maximum operating frequency based on the maximum frequency correction value, the actual maximum operating frequency can be quickly determined, making the determination of the actual maximum operating frequency more standardized, regulated, and accurate.

[0119] In some embodiments, the piping parameters determined by the cooling mode are A, and the maximum frequency correction value is ΔFA.

[0120] The correspondence between piping parameter A in cooling mode and the maximum frequency correction value ΔFA is as follows:

[0121] A First section Second section Third section Fourth section ΔFA ΔFA1 ΔFA2 ΔFA3 ΔFA4

[0122] The value of A1 in the first interval is less than the value of A2 in the second interval, the value of A2 in the second interval is less than the value of A3 in the third interval, and the value of A3 in the third interval is less than the value of A4 in the fourth interval.

[0123] 1 < ΔFA1 < ΔFA2 < ΔFA3 < ΔFA4.

[0124] In some embodiments, the actual maximum operating frequency Fmax = preset maximum operating frequency Fmax0 × ΔFA.

[0125] In some embodiments, the piping parameters determined by the heating mode are B, and the maximum frequency correction value is ΔFB.

[0126] The relationship between the heating mode piping parameter B and the maximum frequency correction value ΔFB is as follows:

[0127] B First section Second section Third section Fourth section ΔFB ΔFB1 ΔFB2 ΔFB3 ΔFB4

[0128] The B1 value of the first interval is less than the B2 value of the second interval, the B2 value of the second interval is less than the B3 value of the third interval, and the B3 value of the third interval is less than the B4 value of the fourth interval.

[0129] 1 < ΔFB1 < ΔFB2 < ΔFB3 < ΔFB4.

[0130] In some embodiments, the actual maximum operating frequency Fmax = preset maximum operating frequency Fmax0 × ΔFB.

[0131] The preset maximum operating frequency Fmax0 ensures that the unit can operate at its rated capacity under standard piping parameters, i.e., it can reach the nominal horsepower.

[0132] In some embodiments, the storage module stores the correspondence between the actual maximum operating frequency and the piping parameters and the preset maximum operating frequency, and the correspondence is a pre-determined functional relationship.

[0133] In some embodiments, the actual maximum operating frequency = m ＊ Preset maximum operating frequency + piping parameters. m is obtained from prior experiments based on curve fitting of the functional relationship.

[0134] The controller is configured to obtain the actual maximum operating frequency based on the piping parameters and their corresponding relationships.

[0135] By pre-determining the correspondence between the actual maximum operating frequency and piping parameters, and the preset maximum operating frequency, the actual maximum operating frequency can be obtained based on the piping parameters and the correspondence. This allows for a rapid determination of the actual maximum operating frequency, making the determination of the actual maximum operating frequency more standardized, regulated, and accurate.

[0136] exist Figure 4 In this example, the method for determining the actual maximum frequency of the compressor is as follows:

[0137] S1, Begin.

[0138] S2. Read the compressor's preset maximum operating frequency.

[0139] S3. Determine the piping parameters under the trial operation mode during the trial operation.

[0140] S4. Determine the actual maximum operating frequency of the compressor based on the piping parameters and the preset maximum operating frequency.

[0141] S5. Write the actual maximum operating frequency into the storage module, and use the actual maximum operating frequency as the upper limit operating frequency of the compressor.

[0142] The compressor must not exceed its actual maximum operating frequency during operation, and other control parameters of the air conditioner that are designed to operate at the compressor's upper limit frequency are all controlled based on the actual maximum operating frequency.

[0143] By increasing the upper limit of the operating frequency, the unit's capabilities under long piping connection schemes can be fully utilized.

[0144] In long-piping interconnection schemes, besides insufficient capacity, other reliability issues are prone to occur. For example, excessive refrigerant can lead to refrigerant backflow during startup, and insufficient responsiveness can also result. Therefore, system control parameters during startup can be adjusted based on the piping parameters.

[0145] In some embodiments, the compressor start-up frequency is adjusted according to piping parameters.

[0146] The storage module stores the compressor's preset start frequency;

[0147] The controller is configured to determine the actual starting frequency of the compressor based on the piping parameters and the preset starting frequency, and control the compressor to start at the actual starting frequency.

[0148] Adjusting the actual starting frequency of the compressor according to the piping parameters can improve the reliability and responsiveness of the air conditioner.

[0149] In some embodiments, the storage module stores a number of piping parameters or a range of piping parameters corresponding to the start-up frequency correction value.

[0150] The controller is configured to determine the start-up frequency correction value based on the piping parameters, and then correct the preset start-up frequency using the start-up frequency correction value to obtain the actual start-up frequency.

[0151] By pre-determining the start-up frequency correction value corresponding to the piping parameters and correcting the preset start-up frequency based on the correction value, the actual start-up frequency can be quickly determined, making the determination of the actual start-up frequency more standardized, regulated, and accurate.

[0152] In some embodiments, the piping parameters determined by the cooling mode are A, and the start-up frequency correction value is ΔHstartA.

[0153] The correspondence between the piping parameter A in cooling mode and the start-up frequency correction value ΔHstartA is as follows:

[0154] A First section Second section Third section Fourth Interval ΔHstartA ΔHstartA1 ΔHstartA2 ΔHstartA3 ΔHstartA4

[0155] The value of A1 in the first interval is less than the value of A2 in the second interval, the value of A2 in the second interval is less than the value of A3 in the third interval, and the value of A3 in the third interval is less than the value of A4 in the fourth interval.

[0156] 1>ΔHstartA1>ΔHstartA2>ΔHstartA3>ΔHstartA4.

[0157] In some embodiments, the actual startup frequency Hstart = preset startup frequency Hstart0 × ΔHstartA.

[0158] In some embodiments, the piping parameters determined by the heating mode are B, and the start-up frequency correction value is ΔHstartB.

[0159] The relationship between the heating mode piping parameter B and the start-up frequency correction value ΔHstartB is as follows:

[0160] B First section Second section Third section Fourth Interval ΔHstartB ΔHstartB1 ΔHstartB2 ΔHstartB3 ΔHstartB4

[0161] The B1 value of the first interval is less than the B2 value of the second interval, the B2 value of the second interval is less than the B3 value of the third interval, and the B3 value of the third interval is less than the B4 value of the fourth interval.

[0162] 1>ΔHstartB1>ΔHstartB2>ΔHstartB3>ΔHstartB4.

[0163] In some embodiments, the actual startup frequency Hstart = preset startup frequency Hstart0 × ΔHstartB.

[0164] The preset start-up frequency Hstart0 is the unit's preset start-up frequency, which can meet the reliability and adaptability requirements of standard piping connection schemes.

[0165] By reducing the start-up frequency, the start-up reliability of long-piped units can be ensured.

[0166] In some embodiments, the storage module stores the correspondence between the actual start-up frequency and the piping parameters and the preset start-up frequency, and the correspondence is a pre-determined functional relationship.

[0167] In some embodiments, the actual startup frequency = n ＊ Preset start-up frequency + piping parameters. n is obtained from prior experiments based on function curve fitting.

[0168] The controller is configured to obtain the actual starting frequency based on the piping parameters and their corresponding relationships.

[0169] By pre-determining the correspondence between the actual starting frequency and the piping parameters and preset starting frequencies, and obtaining the actual starting frequency based on the piping parameters and the correspondence, the actual starting frequency can be determined quickly, making the determination of the actual starting frequency more standardized, regulated and accurate.

[0170] exist Figure 5 In this example, the method for determining the compressor starting frequency is as follows:

[0171] S1, Begin.

[0172] S2. Read the compressor's preset start frequency.

[0173] S3. Determine the piping parameters under the trial operation mode during the trial operation.

[0174] S4. Determine the actual starting frequency of the compressor based on the piping parameters and the preset starting frequency.

[0175] S5. Write the actual start frequency into the storage module and control the compressor to start using the actual start frequency.

[0176] In some embodiments, the opening degree of the expansion valve is adjusted according to the piping parameters.

[0177] The storage module stores the preset start-up opening of the expansion valve;

[0178] The controller is configured to determine the actual starting opening of the expansion valve based on the piping parameters and the preset starting opening, and control the expansion valve to start according to the actual starting opening.

[0179] Adjusting the actual starting opening of the expansion valve according to the piping parameters can improve the reliability and responsiveness of the air conditioner.

[0180] In some embodiments, the storage module stores several piping parameters or piping parameter ranges corresponding to opening correction values;

[0181] The controller is configured to determine the opening correction value based on the piping parameters, and then correct the preset starting opening value to obtain the actual starting opening.

[0182] By pre-determining the opening correction value corresponding to the piping parameters and correcting the preset start-up opening based on the opening correction value, the actual start-up opening can be quickly determined, making the determination of the actual start-up opening more standardized, regulated, and accurate.

[0183] In some embodiments, the piping parameter determined by the cooling mode is A, and the start-up opening correction value is ΔEVstartA.

[0184] The correspondence between the piping parameter A in cooling mode and the start-up frequency correction value ΔEVstartA is as follows:

[0185] A First section Second section Third section Fourth Interval ΔEVstartA ΔEVstartA1 ΔEVstartA2 ΔEVstartA3 ΔEVstartA4

[0186] The value of A1 in the first interval is less than the value of A2 in the second interval, the value of A2 in the second interval is less than the value of A3 in the third interval, and the value of A3 in the third interval is less than the value of A4 in the fourth interval.

[0187] 1>ΔEVstartA1>ΔEVstartA2>ΔEVstartA3>ΔEVstartA4.

[0188] In some embodiments, the actual startup opening EVstart = preset startup opening EVstart0 × ΔEVstartA.

[0189] In some embodiments, the piping parameter determined by the heating mode is B, and the start-up opening correction value is ΔEVstartB.

[0190] The relationship between the piping parameter B in heating mode and the start-up opening correction value ΔEVstartB is as follows:

[0191] B First section Second section Third section Fourth Interval ΔEVstartB ΔEVstartB1 ΔEVstartB2 ΔEVstartB3 ΔEVstartB4

[0192] The B1 value of the first interval is less than the B2 value of the second interval, the B2 value of the second interval is less than the B3 value of the third interval, and the B3 value of the third interval is less than the B4 value of the fourth interval.

[0193] 1>ΔEVstartB1>ΔEVstartB2>ΔEVstartB3>ΔEVstartB4.

[0194] In some embodiments, the actual startup opening EVstart = preset startup opening EVstart0 × ΔEVstartB.

[0195] The preset start-up opening EVstart0 is the unit's preset start-up opening, which can meet the reliability and adaptability requirements of standard piping connection schemes.

[0196] By reducing the start-up opening degree, the start-up reliability of long-piped units is ensured.

[0197] In some embodiments, the storage module stores the correspondence between the actual start-up opening degree and the piping parameters and the preset start-up opening degree, and the correspondence is a pre-determined functional relationship.

[0198] In some embodiments, actual start-up opening = k ＊ Preset start-up opening degree + piping parameters. k is obtained from prior experiments based on function curve fitting.

[0199] The controller is configured to obtain the actual start-up opening based on the piping parameters and their corresponding relationships.

[0200] By pre-determining the correspondence between the actual start-up opening and the piping parameters and preset start-up opening, and obtaining the actual start-up opening based on the piping parameters and the correspondence, the actual start-up opening can be determined quickly, making the determination of the actual start-up opening more standardized, regulated and accurate.

[0201] exist Figure 6 In this example, the method for determining the compressor starting frequency is as follows:

[0202] S1, Begin.

[0203] S2. Read the preset start-up opening of the expansion valve.

[0204] S3. Determine the piping parameters under the trial operation mode during the trial operation.

[0205] S4. Determine the actual starting opening of the expansion valve based on the piping parameters and the preset starting opening.

[0206] S5. Write the actual starting opening degree into the storage module, and control the expansion valve to open based on the actual starting opening degree.

[0207] In some embodiments, the controller is configured to maintain the commissioning process for at least a set time, during which all indoor units operate simultaneously and at the compressor's preset maximum operating frequency.

[0208] By setting up a trial operation process and performing the same controls during the trial operation, the determination of piping parameters can be made under the same conditions, thereby improving the accuracy of the determination of piping parameters.

[0209] In some embodiments, the trial run is at least 20 minutes. If it is less than 20 minutes, it cannot be switched to normal operation or shut down. If the trial run is less than the set time and other operation signals are received, an alarm will be triggered indicating that the trial run is in progress and other operations cannot be performed. Other operation signals will be executed after the trial run is completed.

[0210] The control methods during the trial operation are consistent with the normal maximum capacity operation mode.

[0211] In some embodiments, the controller is configured to obtain operating parameters after a period of time following the start of trial operation to determine the piping parameters of the air conditioner.

[0212] After the trial run has stabilized, the operating parameters are monitored. The piping parameters of the air conditioner are determined based on the operating parameters during the stable operation, which can further improve the accuracy of the piping parameter determination.

[0213] In some embodiments, operating parameters are monitored for a portion of the time after trial operation. When the trial operation lasts for 20 minutes, operating parameters are checked for 15-20 minutes and the average values ​​of the relevant parameters are calculated.

[0214] In some embodiments, the air conditioner includes a cooling test run, which means that the test run process is in cooling mode.

[0215] During the refrigeration test run, the air conditioner includes:

[0216] The indoor unit liquid pipe temperature detection module is used to detect the indoor unit liquid pipe temperatures Tr|1 and Trl2.

[0217] The inspiratory pressure detection module is used to detect the inspiratory pressure Ps.

[0218] exist Figure 1 , 2 In this example, the controller calculates the average liquid pipe temperature of all indoor units as Trl_average = 0.5 × (Trl1 + Trl2).

[0219] The controller can obtain the pressure loss value per unit length of piping based on the indoor unit's average liquid pipe temperature Trl_average, suction pressure Ps, and compressor frequency H (which is the preset maximum compressor frequency).

[0220] The evaporation pressure Pcs (i.e., the saturation temperature corresponding to Trl_average) is calculated by back-calculating Trl_average, and then the pressure drop formula in the turbulent region ΔP=ε×L / D×v is used. 2 Calculate ×ρ.

[0221] Where ε is the resistance coefficient, mainly related to the surface roughness coefficient of the piping, and is generally taken as 0.012N-0.03; L is the characteristic length, which is taken as 1 when calculating the unit pressure loss value; D is the characteristic diameter, which is determined by the specifications of the outdoor unit's connecting piping interface, and is generally between 0.015N-0.04; v is the refrigerant flow velocity in the piping, which is actually related to the compressor frequency, v=H×C / (Π×D) 2 / 4), where C is the compressor displacement, Π is pi; ρ is the refrigerant density on the suction side, which can be calculated from Pcs (or Ps, or the intermediate value of Pcs and Ps) to determine the corresponding saturated gaseous refrigerant density.

[0222] In some embodiments, density can also be calculated by simultaneously using inhalation pressure Ps and inhalation temperature Ts, resulting in higher accuracy.

[0223] The controller is configured to calculate the evaporation pressure Pcs based on the indoor unit's liquid pipe temperature. The refrigeration piping parameters are as follows:

[0224] A = (evaporation pressure Pcs - intake pressure Ps) / turbulent pressure drop ΔP;

[0225] Alternatively, A = (evaporation pressure Pcs - suction pressure Ps) * evaporation pressure Pcs / (a ＊ Preset maximum frequency H 2＊ (Intake-side refrigerant density ρ);

[0226] Alternatively, A = (evaporation pressure Pcs - suction pressure Ps) ＊ Evaporation pressure Pcs / (a ＊ Preset maximum frequency H 2 );

[0227] Alternatively, A = (evaporation pressure Pcs - suction pressure Ps) ＊ Inspiratory pressure Ps / (a ＊ Preset maximum frequency H2 );

[0228] Alternatively, A = (evaporation pressure Pcs - suction pressure Ps) * (evaporation pressure Pcs + suction pressure Ps) / (a ＊ Preset maximum frequency H 2 ).

[0229] Where 'a' is a constant, which can be determined by experimental testing or set by theoretical analysis.

[0230] exist Figure 7 In this example, the method for determining the air conditioning piping parameters during a trial run in cooling mode is as follows:

[0231] S1, Begin.

[0232] S2. If the timer reaches the first time, proceed to step S3; otherwise, proceed to step S2.

[0233] S3. Detect the temperature of the liquid pipe and the suction pressure of the indoor unit.

[0234] S4. If the timer reaches the set trial run time, proceed to step S5; otherwise, proceed to step S3.

[0235] S5. Calculate the average liquid pipe temperature, average suction pressure, and average evaporation pressure of the indoor unit.

[0236] S6. Calculate piping parameter A according to the formula for calculating refrigeration piping parameters.

[0237] In some embodiments, the air conditioner includes a heating test run, which refers to a test run in heating mode.

[0238] During the heating test run, the air conditioner includes:

[0239] The indoor unit coil temperature detection module is used to detect the indoor unit coil temperatures Tr1 and Tr2.

[0240] Inspiratory pressure detection module, used to detect inspiratory pressure Ps;

[0241] Exhaust pressure detection module, used to detect exhaust pressure Pd;

[0242] exist Figure 1 , 2 In this example, the controller calculates the average liquid pipe temperature of all indoor units as Tr_average = 0.5 × (Tr1 + Tr2).

[0243] The controller can obtain the pressure loss value per unit length of piping based on the indoor unit's average piping temperature Tr_average, exhaust pressure Pd, suction pressure Ps, and compressor frequency H (which is the preset maximum compressor frequency).

[0244] The condensation pressure Pc (i.e., the saturation temperature corresponding to Tr_average) is calculated by back-calculating Tr_average, and then the pressure drop formula in the turbulent region ΔP = ε × L / D × v is used. 2 ×ρ d ,calculate.

[0245] Where ε is the resistance coefficient, mainly related to the surface roughness coefficient of the piping, generally taken as 0.012N-0.03; L is the characteristic length, taken as 1 when calculating the unit pressure loss value; D is the characteristic diameter, determined by the specifications of the outdoor unit's connecting piping interface, generally between 0.015N-0.04; v is the refrigerant flow velocity in the piping, which is actually related to the compressor frequency, v=H×C×ρ / (ρ d ×Π×D 2 / 4), where C is the compressor displacement and Π is pi; ρ d ρ is the refrigerant density on the exhaust side, which can be calculated from Pd (or Pc, or the intermediate value of Pd and Pc); ρ is the refrigerant density on the intake side, which can be calculated from Pcs (or Ps, or the intermediate value of Pcs and Ps).

[0246] In some embodiments, density can also be calculated by simultaneously using pressure and temperature, resulting in higher accuracy.

[0247] The controller is configured to calculate the condensing pressure Pc based on the indoor unit coil temperature. The heating piping parameters are as follows:

[0248] B = (exhaust pressure Pd - condensation pressure Pc) / turbulent pressure drop ΔP;

[0249] Alternatively, B = (exhaust pressure Pd - condensation pressure Pc) / (b) ＊ Preset maximum frequency H 2＊ Refrigerant density ρ on the intake side 2 / Exhaust side refrigerant density ρ d );

[0250] Alternatively, B = (exhaust pressure Pd - condensation pressure Pc) ＊ Inspiratory pressure Ps 2 / (Preset maximum frequency H) 2＊ Exhaust pressure (Pd);

[0251] Alternatively, B = (exhaust pressure Pd - condensation pressure Pc) ＊ Inspiratory pressure Ps 2 / (Preset maximum frequency H) 2＊ Condensation pressure Pc);

[0252] Alternatively, B = (exhaust pressure Pd - condensation pressure Pc) ＊ Inspiratory pressure Ps 2 / (Preset maximum frequency H) 2＊ (Condensing pressure Pc + Discharge pressure Pd)

[0253] Where b is a constant, which can be determined by experimental testing or set by theoretical analysis.

[0254] exist Figure 8 In this example, the method for determining the air conditioning piping parameters during the trial run in heating mode is as follows:

[0255] S1, Begin.

[0256] S2. If the timer reaches the first time, proceed to step S3; otherwise, proceed to step S2.

[0257] S3. Detect the indoor unit coil temperature, suction pressure, and exhaust pressure.

[0258] S4. If the timer reaches the set trial run time, proceed to step S5; otherwise, proceed to step S3.

[0259] S5. Calculate the indoor unit's average coil temperature, average suction pressure, average discharge pressure, and average condensing pressure.

[0260] S6. Calculate piping parameter B according to the heating piping parameter calculation formula.

[0261] The trial operation may be in cooling mode or heating mode. Therefore, the calculation methods for the air conditioner piping parameters should be determined separately for cooling mode and heating mode to ensure the accuracy of the piping parameter calculation.

[0262] In some embodiments, the controller is configured to, upon receiving a heating mode control signal, control the air conditioner to perform a heating test run, obtain heating piping parameters, and determine the actual maximum frequency based on the heating piping parameters; and upon receiving a cooling mode control signal, control the air conditioner to perform a cooling test run, obtain cooling piping parameters, and determine the actual maximum frequency based on the cooling piping parameters.

[0263] The air conditioner does not require a test run control button. It can automatically enter the test run by simply starting the air conditioner in cooling or heating mode, determining the piping parameters, and then determining the actual maximum frequency based on the piping parameters. After the test run ends, it can directly enter the air conditioner's demand mode, avoiding complicated operations for the user.

[0264] exist Figure 9 In this example, the control flow of the air conditioner is as follows:

[0265] S1, Begin.

[0266] S2. First run: If yes, proceed to step S3; otherwise, proceed to step S8.

[0267] S3. If the received signal is a cooling mode signal, proceed to step S4; otherwise, proceed to step S5.

[0268] S4. Enter the refrigeration test run. During the refrigeration test run, calculate the piping parameter A, and determine the actual maximum operating frequency of the compressor, the compressor starting frequency, and the expansion valve starting opening based on A. Proceed to step S6.

[0269] S5. Enter the heating test run. During the heating test run, calculate the piping parameter B, and determine the actual maximum operating frequency of the compressor, the compressor starting frequency, and the expansion valve starting opening based on B. Proceed to step S6.

[0270] S6. During the trial operation, are other control signals received? If not, continue with steps S4 and S5. If yes, proceed to step S7.

[0271] S7. An alarm is triggered, indicating that the trial run is not complete. Continue to steps S4 and S5.

[0272] S8, Enter normal control.

[0273] In some embodiments, the controller is configured to control the air conditioner to undergo trial operation upon receiving a trial operation control signal.

[0274] A test run control button is installed, which allows users to initiate the test run process and improve their understanding of the air conditioner's functions.

[0275] exist Figure 9 In this example, the control flow of the air conditioner is as follows:

[0276] S1, Begin.

[0277] S2, Receive trial operation control signal.

[0278] S3. If the received signal is a cooling mode signal, proceed to step S4; otherwise, proceed to step S5.

[0279] S4. Enter the refrigeration test run. During the refrigeration test run, calculate the piping parameter A, and determine the actual maximum operating frequency of the compressor, the compressor starting frequency, and the expansion valve starting opening based on A. Proceed to step S6.

[0280] S5. Enter the heating test run. During the heating test run, calculate the piping parameter B, and determine the actual maximum operating frequency of the compressor, the compressor starting frequency, and the expansion valve starting opening based on B. Proceed to step S6.

[0281] S6. During the trial operation, are other control signals received? If not, continue with steps S4 and S5. If yes, proceed to step S7.

[0282] S7. An alarm is triggered, indicating that the trial run is not complete. Continue to steps S4 and S5.

[0283] The air conditioner determines the impact of resistance factors such as piping length on the unit based on system operating parameters, increases the unit's maximum frequency, and optimizes other operating parameters to reduce capacity degradation and enhance comfort. Furthermore, the air conditioner solves the problem solely through control methods, without increasing costs.

[0284] In the description of the above embodiments, specific features, structures, materials, or characteristics may be combined in any suitable manner in one or more embodiments or examples.

[0285] The above are merely specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. An air conditioner, comprising: compressor; The storage module stores the preset maximum operating frequency of the compressor corresponding to the air conditioner's horsepower, and the preset maximum operating frequency of the compressor serves as the upper limit frequency of the compressor; its characteristic is that... The controller is configured to control the air conditioner to perform a trial run when it is first run after installation, determine the air conditioner's piping parameters, determine the actual maximum operating frequency of the compressor to reach the air conditioner's horsepower based on the piping parameters and the preset maximum operating frequency, write the actual maximum operating frequency into the storage module, and use the actual maximum operating frequency as the compressor's upper limit operating frequency.

2. The air conditioner according to claim 1, characterized in that, The storage module stores a number of piping parameters or the maximum frequency correction value corresponding to a range of piping parameters. The controller is configured to determine the maximum frequency correction value based on the piping parameters, and then correct the preset maximum operating frequency using the maximum frequency correction value to obtain the actual maximum operating frequency. Alternatively, the storage module stores the correspondence between the actual maximum operating frequency and the piping parameters and the preset maximum operating frequency; The controller is configured to obtain the actual maximum operating frequency based on the piping parameters and their corresponding relationships.

3. The air conditioner according to claim 1, characterized in that, The storage module stores the compressor's preset start frequency; The controller is configured to determine the actual starting frequency of the compressor based on the piping parameters and the preset starting frequency, and control the compressor to start at the actual starting frequency.

4. The air conditioner according to claim 3, characterized in that, The storage module stores several piping parameters or start-up frequency correction values ​​corresponding to piping parameter ranges. The controller is configured to determine the start-up frequency correction value based on the piping parameters, and then correct the preset start-up frequency using the start-up frequency correction value to obtain the actual start-up frequency; Alternatively, the storage module stores the correspondence between the actual start frequency and the piping parameters and the preset start frequency; The controller is configured to obtain the actual start-up frequency based on the piping parameters and their corresponding relationships.

5. The air conditioner according to claim 1, characterized in that, The air conditioner includes: Expansion valve; The storage module stores the preset start-up opening of the expansion valve; The controller is configured to determine the actual starting opening of the expansion valve based on the piping parameters and the preset starting opening, and control the expansion valve to start according to the actual starting opening.

6. The air conditioner according to claim 5, characterized in that, The storage module stores several piping parameters or piping parameter ranges corresponding to opening correction values. The controller is configured to determine the opening correction value based on the piping parameters, and then correct the preset starting opening value to obtain the actual starting opening. Alternatively, the storage module stores the correspondence between the actual start-up opening degree and the piping parameters and the preset start-up opening degree; The controller is configured to obtain the actual start-up opening degree based on the piping parameters and their corresponding relationships.

7. The air conditioner according to any one of claims 1-6, characterized in that, The controller is configured to maintain a set time during the trial operation, during which all indoor units operate simultaneously and at the compressor's preset maximum operating frequency.

8. The air conditioner according to claim 7, characterized in that, The controller is configured to obtain operating parameters after a period of time following the start of trial operation to determine the piping parameters of the air conditioner.

9. The air conditioner according to claim 6, characterized in that, The trial operation process of the air conditioner is either a cooling trial operation or a heating trial operation. During the refrigeration test run, the air conditioner includes: Indoor unit liquid pipe temperature detection module, used to detect the temperature of the indoor unit liquid pipe; Inspiratory pressure detection module, used to detect inspiratory pressure; The controller is configured to calculate the evaporation pressure based on the indoor unit's liquid pipe temperature. The refrigeration piping parameters are as follows: (Evaporation pressure - Intake pressure) / Turbulent pressure drop; Alternatively, (evaporation pressure - suction pressure) * evaporation pressure / (preset maximum frequency) 2 *Refrigerant density on the intake side). Alternatively, (evaporation pressure - suction pressure) * evaporation pressure / preset maximum frequency 2 ; Alternatively, (evaporation pressure - intake pressure) * intake pressure / preset maximum frequency 2 ; Alternatively, (evaporation pressure - suction pressure) * (evaporation pressure + suction pressure) / preset maximum frequency 2 ; During the heating test run, the air conditioner includes: Indoor unit coil temperature detection module, used to detect the temperature of the indoor unit coil; Inspiratory pressure detection module, used to detect inspiratory pressure; Exhaust pressure detection module, used to detect exhaust pressure; The controller is configured to calculate the condensing pressure based on the indoor unit coil temperature. The heating piping parameters are as follows: (Exhaust pressure - Condensation pressure) / Turbulent pressure drop; Alternatively, (exhaust pressure - condensation pressure) * / (preset maximum frequency) 2 *Intake-side refrigerant density 2 / Exhaust side refrigerant density); Alternatively, (exhaust pressure - condensation pressure) * intake pressure 2 / (Preset maximum frequency) 2 *Exhaust pressure); Alternatively, (exhaust pressure - condensation pressure) * intake pressure 2 / (Preset maximum frequency) 2 *Condensing pressure); Alternatively, (exhaust pressure - condensation pressure) * intake pressure 2 / (Preset maximum frequency) 2 *(Condensing pressure + Exhaust pressure)).

10. The air conditioner according to claim 9, characterized in that, The controller is configured to control the air conditioner to run in heating mode when it receives a heating mode control signal, obtain heating piping parameters, and determine the actual maximum frequency based on the heating piping parameters. When receiving the cooling mode control signal, the air conditioner is controlled to run a cooling test operation to obtain the cooling piping parameters, and the actual maximum frequency is determined based on the cooling piping parameters. Alternatively, the controller is configured to control the air conditioner to undergo trial operation upon receiving a trial operation control signal.

Images