Central air conditioner model selection method, system, computer equipment and storage medium

Abstract

The present application relates to a model selection method, system, computer equipment and storage medium for a central air conditioner. The method comprises: when detecting that there is a target operating point that needs to be updated among all the operating points of the central air conditioner unit, determining the required optional parts under the target operating point according to the target operating parameters under the target operating point, and generating parameter correction instructions for the parameters to be corrected; responding to the parameter correction instructions, determining the parameter correction mode and correction coefficient; based on the parameter correction mode, determining the target optional parts that meet the target operating parameters. The use of this method can improve the operational convenience and versatility of the model selection of the central air conditioner.

Description

Technical Field

[0001] The present application relates to the field of equipment technology, and in particular to a method, system, computer equipment and storage medium for selecting a central air conditioner model. Background Art

[0002] The chiller selection software currently used in the commercial air-conditioning market for large-scale unit selection can solve sales selection problems and provide users with unit matching solutions that meet their needs. However, in actual use, since the software is based on an algorithm fitted with the performance parameters of standard models, it is not suitable for calculations at any operating point. If the original algorithm fitted with standard performance parameters is still used at some special operating points, problems such as inability to calculate or incorrect calculation results may occur, resulting in the loss of bids in some bidding projects due to the inability to provide a unit selection report for the current operating conditions.

[0003] At present, in order to solve the above problems, when selecting for special bidding projects, the unit designers provide corresponding calculation parameter correction schemes for special working conditions, such as increasing capacity bypass or adding valves, so as to control the parameter correction coefficient. After completing the selection scheme design, the unit designers provide the optional parts to be added and the corresponding correction coefficients to the software developers, who then add the optional parts and the corresponding correction coefficients to the software and provide this special version to the sales company or the person in charge of the bidding. This selection method is inconvenient to operate and has low versatility. Summary of the invention

[0004] Based on this, it is necessary to provide a central air conditioning model selection method, system, computer equipment and storage medium that can improve the operational convenience and versatility of central air conditioning model selection in response to the above technical problems.

[0005] A method for selecting a central air conditioner model, the method comprising:

[0006] When it is detected that there is at least one target operating point that needs to be updated during the operation of the central air-conditioning unit, a target operating parameter of the unit under the target operating point is determined;

[0007] Determining the required optional parts at the target operating point according to the target operating parameters, and generating parameter correction instructions for the parameters to be corrected;

[0008] In response to the parameter correction instruction, determining a parameter correction mode and a correction coefficient;

[0009] Based on the parameter correction mode, a target optional part that meets the target operating parameter is determined according to the accessory type and correction coefficient of the required optional part.

[0010] In one embodiment, when detecting that there is at least one target operating point that needs to be updated during the operation of the central air conditioner unit, determining the target operating parameters of the unit at the target operating point includes:

[0011] When it is detected that there is at least one target operating point that needs to be updated in all operating conditions of the central air-conditioning unit, the target operating parameters of the unit under the target operating point are determined; the all operating conditions include normal operating points and special operating points of the central air-conditioning unit.

[0012] In one embodiment, determining the required optional parts at the target operating point according to the target operating parameters, and generating parameter correction instructions for the parameters to be corrected, include:

[0013] Generating selection instructions for the required optional parts at the target operating point according to the target operating parameters;

[0014] In response to the selection instruction, when there is no option component satisfying the target operating parameter in the selection database, a parameter correction instruction of the parameter to be corrected is generated.

[0015] In one embodiment, the step of responding to the parameter correction instruction and determining the parameter correction mode and correction coefficient includes:

[0016] In response to the parameter correction instruction, determining a first parameter correction mode and a first correction coefficient;

[0017] The step of determining, based on the parameter correction mode and according to the accessory type and correction coefficient of the required optional accessories, a target optional accessory that meets the target operating parameter includes:

[0018] Based on the first parameter correction mode, the original selection parameter corresponding to the accessory type of the required optional accessory is corrected according to the first correction coefficient to obtain a corrected selection parameter;

[0019] According to the corrected selection parameters, target optional parts that meet the target operating parameters are determined.

[0020] In one embodiment, the step of responding to the parameter correction instruction and determining the parameter correction mode and correction coefficient includes:

[0021] In response to the parameter correction instruction, determining a second parameter correction mode and correction parameters;

[0022] The step of determining, based on the parameter correction mode and according to the accessory type and correction coefficient of the required optional accessories, a target optional accessory that meets the target operating parameter includes:

[0023] Based on the second parameter correction mode, determining a second correction coefficient according to the target operating parameter and the actual operating parameter of the unit at the target operating point;

[0024] Correcting the original selection parameters corresponding to the accessory type of the required optional accessory according to the second correction coefficient to obtain corrected selection parameters;

[0025] According to the corrected selection parameters, target optional parts that meet the target operating parameters are determined.

[0026] In one embodiment, the second correction coefficient is determined based on the second parameter correction mode according to the target operating parameter and the actual operating parameter of the unit at the target operating point, including:

[0027] Based on the second parameter correction mode, obtaining actual operating parameters of the unit under the target operating condition;

[0028] The ratio of the actual operating parameter to the target operating parameter is used as a second correction coefficient.

[0029] In one embodiment, determining the target optional parts that meet the target operating parameters based on the parameter correction mode and according to the accessory type and correction coefficient of the required optional parts includes:

[0030] Based on the parameter correction mode, determining at least one candidate optional component that meets the target operating parameter according to the component type and correction coefficient of the required optional component;

[0031] Obtaining the performance index value of each candidate optional component;

[0032] A target optional component that meets the target operating parameters is determined from the candidate optional components according to each of the performance indicator values.

[0033] In one embodiment, the method further comprises:

[0034] Generate a whole machine accessory combination matching the target optional parts, and performance difference data between the whole machine accessory combination and the current whole machine accessory combination of the unit;

[0035] The optional accessories for each operating point of the unit are adjusted according to the performance difference data.

[0036] In one embodiment, the method further comprises:

[0037] Determining the operating index data of the unit at the target operating point according to the target optional parts;

[0038] Evaluation data of the unit is obtained according to the operation index data.

[0039] A central air conditioner model selection system, the system comprising:

[0040] A detection module, for determining a target operating parameter of the unit at the target operating point when it is detected that the unit of the central air conditioner has at least one target operating point that needs to be updated;

[0041] A determination module, used to determine the optional parts required at the target operating point according to the target operating parameters, and to generate parameter correction instructions for the parameters to be corrected;

[0042] A response module, used for responding to the parameter correction instruction and determining a parameter correction mode and a correction coefficient;

[0043] The selection module is used to determine the target optional parts that meet the target operating parameters based on the parameter correction mode and the accessory type and correction coefficient of the required optional parts.

[0044] A computer device comprises a memory and a processor, wherein the memory stores a computer program, and when the processor executes the computer program, the following steps are implemented:

[0045] When it is detected that there is at least one target operating point that needs to be updated during the operation of the central air-conditioning unit, a target operating parameter of the unit under the target operating point is determined;

[0046] Determining the required optional parts at the target operating point according to the target operating parameters, and generating parameter correction instructions for the parameters to be corrected;

[0047] In response to the parameter correction instruction, determining a parameter correction mode and a correction coefficient;

[0048] Based on the parameter correction mode, a target optional part that meets the target operating parameter is determined according to the accessory type and correction coefficient of the required optional part.

[0049] A computer-readable storage medium stores a computer program, which, when executed by a processor, implements the following steps:

[0050] When it is detected that there is at least one target operating point that needs to be updated in the operation of the central air-conditioning unit, the target operating parameters of the unit under the target operating point are determined;

[0051] Determine the optional parts required at the target operating point according to the target operating parameters, and generate parameter correction instructions for the parameters to be corrected;

[0052] In response to the parameter correction instruction, determining a parameter correction mode and a correction coefficient;

[0053] Based on the parameter correction mode, a target optional part that meets the target operating parameter is determined according to the accessory type and correction coefficient of the required optional part.

[0054] The above-mentioned central air-conditioning model selection method, system, computer equipment and storage medium, when there is a target operating point that needs to be updated among all the operating points of the unit, the parameter correction mode and the correction coefficient of the accessory parameters are determined according to the selection instructions, and the target optional accessories that meet the target operating parameters are determined from the selection database; that is, for any target operating point that needs to be updated in the unit, the target optional accessories for the target operating parameters can be automatically screened out according to the parameter correction mode and the correction coefficient of the accessory selection, without the need to manually calculate the correction coefficient after adding accessories, thereby improving the efficiency and accuracy of the selection; when conventional accessories cannot meet the operating conditions of the unit, eligible accessories can be automatically matched and the correction coefficient that the current accessories need to be matched can be given, thereby improving the operational convenience and versatility of model selection in central air conditioners. BRIEF DESCRIPTION OF THE DRAWINGS

[0055] Figure 1 A schematic diagram of a flow chart of a method for selecting a central air conditioner model in one embodiment;

[0056] Figure 2 A schematic flow chart of the steps for selecting a central air conditioner model in one embodiment;

[0057] Figure 3 A schematic diagram of a flow chart of a method for selecting a central air conditioner model in another embodiment;

[0058] Figure 4 A schematic diagram of a flow chart of a method for selecting a central air conditioner model in another embodiment;

[0059] Figure 5 It is a structural block diagram of a central air conditioner model selection system in one embodiment;

[0060] Figure 6 FIG. 4 is a diagram showing the internal structure of a computer device in one embodiment. DETAILED DESCRIPTION

[0061] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0062] In one embodiment, Figure 1As shown, a method for selecting a model of a central air conditioner is provided. This embodiment takes the method applied to a terminal as an example. It can be understood that the method can also be applied to a server, and can also be applied to a system including a terminal and a server, and is implemented through the interaction between the terminal and the server. In this embodiment, the method includes the following steps:

[0063] Step 102, when it is detected that there is at least one target operating point that needs to be updated during the operation of the central air-conditioning unit, the target operating parameters of the unit under the target operating point are determined.

[0064] Among them, the large units of central air conditioning include chillers and hot water units, etc. In addition, it also includes combined cabinets and air conditioning fan disks related to central air conditioning units. The target operating point that needs to be updated can be the normal operating point when the unit is operating normally, for example, the inlet and outlet water temperatures of the chiller under normal operating conditions of the central air conditioning are 5 degrees or 7 degrees; it can also be the special operating point of each unit of the central air conditioning. The special operating point refers to the operating point where the operating parameters of the central air conditioning unit are not within the normal operating parameter range and can operate normally, that is, the operating condition under special environment; for example, under the general operating state of the central air conditioning, the inlet and outlet water temperatures of the chiller are 5 degrees or 7 degrees; when operating under special environment, it is necessary to ensure that the inlet and outlet water temperatures of the chiller reach a temperature difference of 10 degrees. The operating condition under this environment is a special operating condition. The parameters of the special operating point include water flow, inlet water temperature, evaporation temperature and condensation temperature. The target operating parameters refer to the operating parameters of the unit under special operating points or normal operating points, namely the power, pressure drop and coefficient of performance (COP) of the unit. The coefficient of performance is the ratio of energy conversion efficiency.

[0065] Specifically, all the operating conditions of the central air-conditioning unit input on the receiving terminal interface are confirmed, the special operating points where the unit may operate are confirmed, and the configurable optional parts are determined from the selection database; when the existence of special operating points in the operating conditions is detected, the target operating parameters of the unit under the special operating points are determined.

[0066] Step 104 , determining the optional parts required at the target operating point according to the target operating parameters, and generating parameter correction instructions for the parameters to be corrected.

[0067] Among them, in the selection of central air-conditioning models, the parameters to be corrected include the inlet air wet-bulb temperature or the inlet air dry-bulb temperature, or the inlet water temperature, air volume, etc.

[0068] Specifically, according to the target operating parameters of the central air conditioner at the target operating point, the optional parts required for the unit are determined, the parameters to be corrected that need to be corrected for the optional parts selection are determined, and parameter correction instructions for the parameters to be corrected are generated. The optional parts required for the unit can be obtained from the selection database, or can be obtained by updating the selection database through the terminal display interface, for example, performing the selection database update operation on the terminal display interface to add the optional parts required for the unit.

[0069] Optionally, in one embodiment, a selection instruction for optional parts required at a target operating point is generated based on the target operating parameters; in response to the selection instruction, when there are no optional parts meeting the target operating parameters in the selection database, a parameter correction instruction for the parameter to be corrected is generated.

[0070] Specifically, based on the target operating parameters, a selection instruction for the optional accessories required under the target operating point is generated; in response to the selection instruction, when there are no optional accessories that meet the target operating parameters in the selection database, the optional accessories can be configured and parameter correction instructions for the parameters to be corrected can be generated, wherein the configuration method can be but is not limited to adding optional accessories to the selection interface, such as a four-way bypass valve, an electric control valve, and an electric butterfly valve, and a text box for a correction coefficient is added behind each accessory, and the parameters to be corrected are corrected (e.g., inputting a correction coefficient) by responding to the parameter correction instruction to improve the efficiency of selection.

[0071] Step 106, responding to the parameter correction instruction, determining the parameter correction mode and correction coefficient.

[0072] The parameter correction instruction carries a correction mode identifier, and the parameter correction instruction may be, but is not limited to, generated by triggering a button on a terminal display interface or responding to a trigger operation on a terminal display interface.

[0073] The parameter correction mode includes a first parameter correction mode and a second parameter correction mode. The first parameter correction mode refers to correcting the original selection parameters according to the determined first correction coefficient to obtain the corrected selection parameters, and determining the target optional parts that meet the target operating point according to the selection parameters.

[0074] The second parameter correction mode refers to calculating according to the actual operating parameters of the unit at the target operating point to determine the optional parts that need to be added and the corresponding second correction coefficient. The second correction coefficient corrects the original selection parameters to obtain the corrected selection parameters, and determines the target optional parts that meet the target operating point based on the selection parameters.

[0075] Optionally, in one embodiment, based on the parameter correction mode, according to the accessory type and correction coefficient of the required optional accessories, at least one candidate optional accessory that meets the target operating parameters is determined; the performance index value of each candidate optional accessory is obtained; according to each performance index value, a target optional accessory that meets the target operating parameters is determined from the candidate optional accessories; and according to the performance index value, the best target optional accessory can be determined from the candidate optional accessories.

[0076] Step 108 : Based on the parameter correction mode, according to the accessory type and correction coefficient of the required optional accessories, determine the target optional accessories that meet the target operating parameters.

[0077] In the above-mentioned central air-conditioning model selection and accessories selection method, when there is a target operating point that needs to be updated among all the operating points of the unit, the parameter correction mode and the correction coefficient of the accessory parameters are determined according to the selection instructions, and the target optional accessories that meet the target operating parameters are determined from the selection database; that is, for any target operating point that needs to be updated in the unit, the target optional accessories for the target operating parameters can be automatically screened out according to the parameter correction mode and the correction coefficient of the accessory selection, and there is no need to manually calculate the correction coefficient after adding accessories, thereby improving the efficiency and accuracy of the selection; when conventional accessories cannot meet the operating conditions of the unit, qualified accessories can be automatically matched and the correction coefficient that the current accessories need to be matched can be given, thereby improving the convenience and versatility of model selection in central air conditioners.

[0078] In one embodiment, Figure 2 As shown, a central air conditioner model selection step is provided. This embodiment uses the step applied to a terminal as an example. In this embodiment, the step includes the following:

[0079] Step 202: When it is detected that there is at least one target operating point that needs to be updated during the operation of the central air-conditioning unit, the target operating parameters of the unit under the target operating point are determined.

[0080] Specifically, when it is detected that there is at least one target operating point that needs to be updated in all operating conditions of the central air-conditioning unit, the target operating parameters of the unit under the target operating point are determined, wherein all operating conditions include normal operating points and special operating points of the central air-conditioning unit.

[0081] Step 204 : generating selection instructions for the required optional parts at the target operating point according to the target operating parameters.

[0082] Step 206 , responding to the selection instruction, checking whether there is an option that meets the target operating parameters in the selection database, if not, executing step 210 , if yes, executing step 208 .

[0083] Step 208: Determine the optional parts that meet the target operating parameters from the selection database.

[0084] Step 210: Generate parameter correction instructions.

[0085] Step 212, responding to the parameter correction instruction, determining the parameter correction mode.

[0086] Step 214: when the parameter correction mode is the first parameter correction mode, obtain a first correction coefficient.

[0087] Step 216 , based on the first parameter correction mode, correct the original selection parameters corresponding to the accessory type of the required optional accessory according to the first correction coefficient to obtain the corrected selection parameters.

[0088] Step 218, determining target optional parts that meet the target operating parameters based on the corrected selection parameters.

[0089] Step 220: When the parameter correction mode is the second parameter correction mode, a second correction coefficient is determined according to the target operating parameters and the actual operating parameters of the unit at the target operating point.

[0090] Step 222: correct the original selection parameters corresponding to the accessory type of the required optional accessory according to the second correction coefficient to obtain the corrected selection parameters.

[0091] Step 224, determining target optional parts that meet the target operating parameters based on the corrected selection parameters.

[0092] Optionally, in one embodiment, the step of: when determining the target optional parts, generating a whole machine parts combination that matches the target optional parts, and performance difference data between the whole machine parts combination and the current whole machine parts combination of the unit; and adjusting the optional parts for each operating point of the unit according to the performance difference data.

[0093] Optionally, in one embodiment, the step of: determining the operating index data of the unit at the target operating point according to the target optional parts; obtaining the evaluation data of the unit according to the operating index data; that is, the optional parts can be determined according to the evaluation data.

[0094] In the above-mentioned central air-conditioning model selection step, when it is detected that there are special operating points in the operation of the central air-conditioning unit, a parameter correction instruction is generated according to whether the optional accessories in the selection database can meet the target operating points that need to be updated. By responding to the parameter correction instruction, different parameter correction modes are determined. Based on different parameter correction modes, models for special working conditions can be matched according to the correction coefficient, which effectively shortens the bidding time and allows the selection of models for different types of equipment, thereby improving the versatility of the selection method and the convenience of the selection operation.

[0095] In another embodiment, Figure 3As shown, a method for selecting a central air conditioner model is provided. This embodiment uses the method applied to a terminal as an example. In this embodiment, the method includes the following steps:

[0096] Step 302: when it is detected that there is at least one target operating point that needs to be updated among all the operating points of the central air-conditioning unit, the target operating parameters of the unit under the target operating point are determined.

[0097] Among them, all operating conditions include normal operating points and special operating points of the central air-conditioning unit. The target operating parameters refer to the parameters that meet user needs when the unit operates under the target operating points. The target operating parameters include the COP, power, pressure drop and other parameters of the unit operation.

[0098] Step 304: Generate selection instructions for the required optional parts at the target operating point according to the target operating parameters.

[0099] Step 306 , in response to the selection instruction, when there is no option component satisfying the target operating parameter in the selection database, a parameter correction instruction of the parameter to be corrected is generated.

[0100] Among them, the parameters to be corrected include the inlet air wet-bulb temperature, the inlet air dry-bulb temperature, the inlet water temperature and the air volume.

[0101] Step 308, in response to the parameter correction instruction, determining a first parameter correction mode and a first correction coefficient.

[0102] The first parameter correction mode may be, but is not limited to, a manual correction mode, that is, manually selecting a special operating point and optional accessories required at the special operating point.

[0103] Step 310 , based on the first parameter correction mode, correct the original selection parameters corresponding to the accessory type of the required optional accessory according to the first correction coefficient to obtain the corrected selection parameters.

[0104] Specifically, during the project bidding process, a first correction coefficient is pre-calculated by manually selecting a special operating point and the optional parts required under the special operating point; the original selection parameters corresponding to the first correction coefficient are corrected to obtain the corrected selection parameters.

[0105] Step 312, determining target optional parts that meet target operating parameters based on the corrected selection parameters.

[0106] For example, when the special operating point is that the inlet water temperature difference is 10 degrees, it is necessary to perform parameter correction processing on the inlet water temperature. A new inlet water temperature is obtained based on the correction coefficient and the known correction formula. The evaporation temperature and condensation temperature are calculated based on the new inlet water temperature. Then, the COP, power, pressure drop and other parameters of the unit operation are calculated, and the target optional parts that meet the target operating parameters are determined.

[0107] Optionally, in one embodiment, based on the target optional parts, the operating index data of the unit at the target operating point is determined; based on the operating index data, the evaluation data of the unit is obtained, and the overall performance of the whole machine and various parameter indicators can be determined based on the evaluation data, that is, the whole machine parameter indicators of the central air conditioner can be obtained.

[0108] In the above-mentioned central air-conditioning model selection method, when there are special operating points in the operation of the central air-conditioning unit, and when there are no optional parts that meet the target operating parameters in the selection database, parameter correction instructions for the parameters to be corrected are generated, and the original selection parameters are corrected through the means correction mode to obtain the corrected selection parameters. The target optional parts that meet the target operating points are determined based on the selection parameters, and the optional parts selection of the current unit is completed through the correction coefficient in the manual correction mode, which simplifies the selection operation and improves the selection efficiency.

[0109] In another embodiment, Figure 4 As shown, a method for selecting a central air conditioner model is provided. This embodiment uses the method applied to a terminal as an example. In this embodiment, the method includes the following steps:

[0110] Step 402: when it is detected that there is at least one target operating point that needs to be updated among all the operating points of the central air-conditioning unit, the target operating parameters of the unit under the target operating point are determined.

[0111] Step 404: Generate selection instructions for the required optional parts at the target operating point according to the target operating parameters.

[0112] Step 406 , in response to the selection instruction, when there is no option component satisfying the target operating parameter in the selection database, a parameter correction instruction of the parameter to be corrected is generated.

[0113] Step 408, in response to the parameter correction instruction, determining a second parameter correction mode and a second correction parameter.

[0114] Step 410, based on the second parameter correction mode, determine the second correction coefficient according to the target operating parameters and the actual operating parameters of the unit at the target operating point.

[0115] Among them, the correction coefficient refers to the one determined based on the ratio of the actual operating parameters to the target operating parameters, that is, based on the second parameter correction mode, the actual operating parameters of the unit under the target operating conditions are obtained; and the ratio of the actual operating parameters to the target operating parameters is used as the second correction coefficient.

[0116] Taking the selection of chillers as an example, when the temperature difference is 10 degrees under special working conditions, the normal calculation steps should be to calculate the COP, cooling capacity and power of the unit based on the chilled water inlet and outlet water temperatures and the cooling water inlet and outlet water temperatures, or water flow, refrigerant type, refrigerant concentration and other parameters; the reverse calculation is to calculate the range of cooling water inlet temperature based on the target COP, cooling capacity and power range, and then calculate the correction factor based on the known cooling water inlet temperature. For example, the reverse calculated water flow is 7L / S, and the actual input water flow is 10L / S, then the correction factor is 0.7. Add an electric butterfly valve and adjust the valve opening to meet the conditions.

[0117] Step 412: correct the original selection parameters corresponding to the accessory type of the required optional accessory according to the second correction coefficient to obtain the corrected selection parameters.

[0118] Step 414, determining target optional parts that meet the target operating parameters based on the corrected selection parameters.

[0119] Optionally, in one embodiment, a whole machine accessory combination matching the target optional parts and performance difference data between the whole machine accessory combination and the current whole machine accessory combination of the unit are generated; the optional parts for each operating point of the unit are adjusted according to the performance difference data; the overall performance of the equipment can be improved.

[0120] In one embodiment, a central air-conditioning model selection method is applied in the equipment bidding stage as an example for explanation. When it is detected that there is at least one target operating point that needs to be updated among all the operating points of the central air-conditioning unit, the target operating parameters of the unit under the target operating point are determined; the target operating point is taken as a special operating point of a chiller as an example for explanation, that is, when the unit is running, the inlet and outlet water temperatures are 5 degrees and 7 degrees, but in special cases, the inlet and outlet water temperatures may be 10 degrees. This operating condition under a special environment is a special operating condition.

[0121] According to the target operating parameters, a selection instruction for the required optional parts under the target operating point is generated; in response to the selection instruction, the terminal generates a prompt message to prompt the unit designer of the central air-conditioning to sort out all the special operating conditions of the unit, find out all the configurable optional parts, and respond to the selection instruction. When there are no optional parts that meet the target operating parameters in the selection database, a parameter correction instruction for the parameter to be corrected is generated; the parameter to be corrected is determined to be at least one of the inlet air wet-bulb temperature or the inlet air dry-bulb temperature, the inlet water temperature and the air volume; in response to the parameter correction instruction, the parameter correction mode and the correction coefficient are determined.

[0122] When the parameter correction mode is determined to be the first parameter correction mode, that is, manual correction, select the corresponding special working condition and the type of optional parts to be added and the determined first correction coefficient, perform parameter correction processing on the inlet water temperature, and obtain a new inlet water temperature based on the correction coefficient and correction formula. Calculate the evaporation temperature and condensation temperature based on the inlet water temperature, and then calculate the COP, power, pressure drop and other parameters of the unit operation, and determine the target optional parts and the unit's operating data.

[0123] When the parameter correction mode is determined to be the second parameter correction mode, that is, automatic correction, the range of the cooling water inlet temperature is calculated according to the numerical range of the target COP of the unit operation and parameters such as power and pressure drop, and then the correction coefficient is calculated based on the known cooling water inlet temperature to determine the target optional parts and the operating data of the unit; for example, based on the known cooling water inlet temperature, the correction coefficient is calculated. For example, if the inversely calculated water flow rate is 7L / S and the actual input water flow rate is 10L / S, then the correction coefficient is 0.7, and the target optional part is determined to be the electric butterfly valve.

[0124] That is, in the above-mentioned central air-conditioning model selection method, the selection with parameter correction of all operating points can be completed by changing the current project parameter configuration without affecting the parameter selection configuration of other equipment. It has compatibility and versatility, and improves the selection efficiency and accuracy.

[0125] In the above-mentioned central air-conditioning model selection method, when there are special operating points in the operation of the central air-conditioning unit, and when there are no optional parts that meet the target operating parameters in the selection database, parameter correction instructions for the parameters to be corrected are generated, and based on the automatic correction mode, the original selection parameters are corrected by inverse calculation to obtain the corrected selection parameters, and the target optional parts that meet the target operating points are determined according to the selection parameters, and the optional parts selection of the current unit is completed by the correction coefficient in the manual correction mode, which simplifies the selection operation and improves the selection efficiency.

[0126] It should be understood that although Figure 1-4The steps in the flowchart are shown in sequence as indicated by the arrows, but these steps are not necessarily executed in the order indicated by the arrows. Unless otherwise specified in this document, there is no strict order restriction for the execution of these steps, and these steps can be executed in other orders. Moreover, Figure 1-4 At least part of the steps may include multiple steps or multiple stages. These steps or stages are not necessarily performed at the same time, but can be performed at different times. The execution order of these steps or stages is not necessarily sequential, but can be performed in turn or alternately with other steps or at least part of the steps or stages in other steps.

[0127] In one embodiment, Figure 5 As shown, a central air conditioner model selection system is provided, including: a detection module 502, a determination module 504, a response module 506, and a selection module 508, wherein:

[0128] The detection module 502 is used to determine the target operating parameters of the unit at the target operating point when it is detected that there is at least one target operating point that needs to be updated among all the operating points of the central air-conditioning unit.

[0129] The instruction module 504 is used to determine the optional parts required at the target operating point according to the target operating parameters, and to generate parameter correction instructions for the parameters to be corrected.

[0130] The response module 506 is used to respond to the parameter correction instruction and determine the parameter correction mode and correction coefficient.

[0131] The selection module 508 is used to determine the target optional parts that meet the target operating parameters based on the parameter correction mode and the accessory type and correction coefficient of the required optional parts.

[0132] In the model selection system of the above-mentioned central air conditioner, when there is a target operating point that needs to be updated among all the operating points of the unit, the parameter correction mode and the correction coefficient of the accessory parameters are determined according to the selection instructions, and the target optional accessories that meet the target operating parameters are determined from the selection database; that is, for any target operating point that needs to be updated in the unit, the target optional accessories for the target operating parameters can be automatically screened out according to the parameter correction mode and the correction coefficient of the accessory selection, and there is no need to manually calculate the correction coefficient after adding accessories, thereby improving the efficiency and accuracy of the selection; when conventional accessories cannot meet the operating conditions of the unit, eligible accessories can be automatically matched and the correction coefficient that the current accessories need to be matched can be given, thereby improving the operational convenience and versatility of model selection in central air conditioners.

[0133] In one embodiment, Figure 5As shown, a central air conditioner model selection system is provided, which includes, in addition to a detection module 502, a determination module 504, a response module 506 and a selection module 508, an instruction generation module, a parameter correction module, an acquisition module, a generation module, an adjustment module and an evaluation module, wherein:

[0134] In one embodiment, the detection module 502 is also used to determine the target operating parameters of the unit under the target operating point when it is detected that there is at least one target operating point that needs to be updated among all the operating conditions of the central air-conditioning unit; the said all operating conditions include normal operating points and special operating points of the central air-conditioning unit.

[0135] The instruction generation module is used to generate a selection instruction for the optional parts required under the target operating point according to the target operating parameters; in response to the selection instruction, when there is no optional part that meets the target operating parameters in the selection database, a parameter correction instruction for the parameter to be corrected is generated.

[0136] In one embodiment, the response module 506 is further configured to respond to the parameter correction instruction and determine the first parameter correction mode and the first correction coefficient.

[0137] The parameter correction module is used to correct the original selection parameters corresponding to the accessory type of the required optional accessories according to the first correction coefficient based on the first parameter correction mode to obtain the corrected selection parameters.

[0138] In one embodiment, the selection module 508 is further configured to determine target optional parts that meet the target operating parameters according to the corrected selection parameters.

[0139] In one embodiment, the response module 506 is further configured to respond to the parameter correction instruction and determine a second parameter correction mode and a second correction parameter.

[0140] In one embodiment, the parameter correction module is also used to determine a second correction coefficient based on a second parameter correction mode, according to the target operating parameters and the actual operating parameters of the unit at the target operating point; and to correct the original selection parameters corresponding to the accessory type of the required optional accessories according to the second correction coefficient to obtain the corrected selection parameters.

[0141] In one embodiment, the selection module 508 is further configured to determine target optional parts that meet the target operating parameters according to the corrected selection parameters.

[0142] The acquisition module is used to acquire the actual operating parameters of the unit under the target operating conditions based on the second parameter correction mode.

[0143] In one embodiment, the parameter correction module is further configured to use the ratio of the actual operating parameter to the target operating parameter as a second correction coefficient.

[0144] In one embodiment, the acquisition module is further used to determine at least one candidate optional part that meets the target operating parameters based on the parameter correction mode and the accessory type and correction coefficient of the required optional part; and obtain the performance indicator value of each candidate optional part.

[0145] In one embodiment, the selection module 508 is further configured to determine a target option that meets the target operating parameters from the candidate options according to the values ​​of the performance indicators.

[0146] The generation module is used to generate a whole machine accessory combination that matches the target optional parts, as well as performance difference data between the whole machine accessory combination and the current whole machine accessory combination of the unit.

[0147] The adjustment module is used to adjust the optional accessories at each operating point of the unit according to the performance difference data.

[0148] The evaluation module is used to determine the operating index data of the unit under the target operating point according to the target optional parts; and obtain the evaluation data of the unit according to the operating index data.

[0149] In one embodiment, when it is detected that there is at least one target operating point that needs to be updated among all the operating points of the central air-conditioning unit, the target operating parameters of the unit at the target operating point are determined; based on the target operating parameters, a selection instruction for the required optional parts at the target operating point is generated; in response to the selection instruction, when there are no optional parts that meet the target operating parameters in the selection database, a parameter correction instruction for the parameters to be corrected is generated; when a first parameter correction mode and a first correction coefficient are determined in response to the parameter correction instruction, based on the first parameter correction mode, the original selection parameters corresponding to the accessory type of the required optional parts are corrected according to the first correction coefficient to obtain the corrected selection parameters; based on the corrected selection parameters, the target optional parts that meet the target operating parameters are determined.

[0150] When responding to the parameter correction instruction and determining the second parameter correction mode and the second correction parameter, based on the second parameter correction mode, determine the second correction coefficient according to the target operating parameters and the actual operating parameters of the unit at the target operating point; correct the original selection parameters corresponding to the accessory type of the required optional accessories according to the second correction coefficient to obtain the corrected selection parameters; determine the target optional accessories that meet the target operating parameters according to the corrected selection parameters; that is, for any target operating point that needs to be updated in the unit, the target optional accessories for the target operating parameters can be automatically screened out according to the selected parameter correction mode and the correction coefficient of the accessory selection, without the need to manually calculate the correction coefficient after adding accessories, thereby improving the efficiency and accuracy of the selection; when conventional accessories cannot meet the operating conditions of the unit, eligible accessories can be automatically matched and the correction coefficient that the current accessories need to match can be given, thereby improving the convenience and versatility of model selection in central air conditioners.

[0151] For the specific definition of the central air conditioner model selection system, please refer to the definition of the central air conditioner model selection method mentioned above, which will not be repeated here. Each module in the above-mentioned central air conditioner model selection system can be implemented in whole or in part by software, hardware and a combination thereof. The above-mentioned modules can be embedded in or independent of the processor in the computer device in the form of hardware, or can be stored in the memory of the computer device in the form of software, so that the processor can call and execute the operations corresponding to the above modules.

[0152] In one embodiment, a computer device is provided. The computer device may be a terminal, and its internal structure diagram may be as follows: Figure 6 As shown. The computer device includes a processor, a memory, a communication interface, a display screen and an input system connected through a system bus. Among them, the processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The communication interface of the computer device is used to communicate with an external terminal in a wired or wireless manner, and the wireless manner can be achieved through WIFI, an operator network, NFC (near field communication) or other technologies. When the computer program is executed by the processor, a method for selecting a model of a central air conditioner is implemented. The display screen of the computer device can be a liquid crystal display screen or an electronic ink display screen, and the input system of the computer device can be a touch layer covered on the display screen, or a button, trackball or touchpad set on the computer device housing, or an external keyboard, touchpad or mouse, etc.

[0153] Those skilled in the art will understand that Figure 6 The structure shown in the figure is only a block diagram of a part of the structure related to the solution of the present application, and does not constitute a limitation on the computer device to which the solution of the present application is applied. The specific computer device may include more or fewer components than those shown in the figure, or combine certain components, or have a different arrangement of components.

[0154] In one embodiment, a computer device is provided, including a memory and a processor, wherein a computer program is stored in the memory, and when the processor executes the computer program, the following steps are implemented:

[0155] When it is detected that there is at least one target operating point that needs to be updated during the operation of the central air-conditioning unit, a target operating parameter of the unit under the target operating point is determined;

[0156] Determine the required optional parts under the target operating point according to the target operating parameters, and generate parameter correction instructions for the parameters to be corrected;

[0157] Responding to the parameter correction instruction, determining the parameter correction mode and correction coefficient;

[0158] Based on the parameter correction mode, the target optional parts that meet the target operating parameters are determined according to the accessory type and correction coefficient of the required optional parts.

[0159] In one embodiment, when the processor executes the computer program, the processor further implements the following steps:

[0160] When it is detected that there is at least one target operating point that needs to be updated in all operating conditions of the central air-conditioning unit, the target operating parameters of the unit under the target operating point are determined; all operating conditions include normal operating points and special operating points of the central air-conditioning unit.

[0161] In one embodiment, when the processor executes the computer program, the processor further implements the following steps:

[0162] Generate selection instructions for the required optional parts under the target operating point based on the target operating parameters;

[0163] In response to the selection instruction, when there is no option that meets the target operating parameters in the selection database, a parameter correction instruction for the parameter to be corrected is generated.

[0164] In one embodiment, when the processor executes the computer program, the processor further implements the following steps:

[0165] In response to the parameter correction instruction, determining a first parameter correction mode and a first correction coefficient;

[0166] Based on the parameter correction mode, the target optional parts that meet the target operating parameters are determined according to the accessory type and correction coefficient of the required optional parts, including:

[0167] Based on the first parameter correction mode, the original selection parameter corresponding to the accessory type of the required optional accessory is corrected according to the first correction coefficient to obtain the corrected selection parameter;

[0168] According to the revised selection parameters, determine the target optional parts that meet the target operating parameters.

[0169] In one embodiment, when the processor executes the computer program, the processor further implements the following steps:

[0170] In response to the parameter correction instruction, determining a second parameter correction mode and a second correction parameter;

[0171] Based on the parameter correction mode, the target optional parts that meet the target operating parameters are determined according to the accessory type and correction coefficient of the required optional parts, including:

[0172] Based on the second parameter correction mode, determining the second correction coefficient according to the target operating parameters and the actual operating parameters of the unit at the target operating point;

[0173] Correcting the original selection parameters corresponding to the accessory type of the required optional accessory according to the second correction coefficient to obtain corrected selection parameters;

[0174] According to the revised selection parameters, determine the target optional parts that meet the target operating parameters.

[0175] In one embodiment, when the processor executes the computer program, the processor further implements the following steps:

[0176] Based on the second parameter correction mode, obtaining actual operating parameters of the unit under the target operating conditions;

[0177] The ratio of the actual operating parameter to the target operating parameter is used as the second correction coefficient.

[0178] In one embodiment, when the processor executes the computer program, the processor further implements the following steps:

[0179] Based on the parameter correction mode, determining at least one candidate optional part that meets the target operating parameters according to the part type and the correction coefficient of the required optional part;

[0180] Obtaining performance index values ​​of each candidate optional component;

[0181] A target option that meets the target operating parameters is determined from candidate options based on the values ​​of each performance indicator.

[0182] In one embodiment, when the processor executes the computer program, the processor further implements the following steps:

[0183] Generate a whole machine parts combination that matches the target optional parts, and performance difference data between the whole machine parts combination and the current whole machine parts combination of the unit;

[0184] Adjust the optional accessories for each operating point of the unit based on the performance difference data.

[0185] In one embodiment, when the processor executes the computer program, the processor further implements the following steps:

[0186] According to the target selection parts, determine the unit's operating index data at the target operating point;

[0187] Based on the operating index data, the evaluation data of the unit is obtained.

[0188] In one embodiment, a computer readable storage medium is provided, on which a computer program is stored, and when the computer program is executed by a processor, the following steps are implemented:

[0189] When it is detected that there is at least one target operating point that needs to be updated in the operation of the central air-conditioning unit, a target operating parameter of the unit under the target operating point is determined;

[0190] According to the target operating parameters, determine the required optional parts under the target operating point, and generate parameter correction instructions for the parameters to be corrected;

[0191] Responding to the parameter correction instruction, determining the parameter correction mode and correction coefficient;

[0192] Based on the parameter correction mode, the target optional parts that meet the target operating parameters are determined according to the accessory type and correction coefficient of the required optional parts.

[0193] In one embodiment, when the computer program is executed by a processor, the following steps are also implemented:

[0194] When it is detected that there is at least one target operating point that needs to be updated in all operating conditions of the central air-conditioning unit, the target operating parameters of the unit under the target operating point are determined; all operating conditions include normal operating points and special operating points of the central air-conditioning unit.

[0195] In one embodiment, when the computer program is executed by a processor, the following steps are also implemented:

[0196] Generate selection instructions for the required optional parts under the target operating point based on the target operating parameters;

[0197] In response to the selection instruction, when there is no option that meets the target operating parameters in the selection database, a parameter correction instruction for the parameter to be corrected is generated.

[0198] In one embodiment, when the computer program is executed by a processor, the following steps are also implemented:

[0199] In response to the parameter correction instruction, determining a first parameter correction mode and a first correction coefficient;

[0200] Based on the parameter correction mode, the target optional parts that meet the target operating parameters are determined according to the accessory type and correction coefficient of the required optional parts, including:

[0201] Based on the first parameter correction mode, the original selection parameter corresponding to the accessory type of the required optional accessory is corrected according to the first correction coefficient to obtain the corrected selection parameter;

[0202] According to the revised selection parameters, determine the target optional parts that meet the target operating parameters.

[0203] In one embodiment, when the computer program is executed by a processor, the following steps are also implemented:

[0204] In response to the parameter correction instruction, determining a second parameter correction mode and a second correction parameter;

[0205] Based on the parameter correction mode, the target optional parts that meet the target operating parameters are determined according to the accessory type and correction coefficient of the required optional parts, including:

[0206] Based on the second parameter correction mode, determining the second correction coefficient according to the target operating parameters and the actual operating parameters of the unit at the target operating point;

[0207] Correcting the original selection parameters corresponding to the accessory type of the required optional accessory according to the second correction coefficient to obtain corrected selection parameters;

[0208] According to the revised selection parameters, determine the target optional parts that meet the target operating parameters.

[0209] In one embodiment, when the computer program is executed by a processor, the following steps are also implemented:

[0210] Based on the second parameter correction mode, obtaining actual operating parameters of the unit under the target operating conditions;

[0211] The ratio of the actual operating parameter to the target operating parameter is used as the second correction coefficient.

[0212] In one embodiment, when the computer program is executed by a processor, the following steps are also implemented:

[0213] Based on the parameter correction mode, determining at least one candidate optional part that meets the target operating parameters according to the part type and the correction coefficient of the required optional part;

[0214] Obtaining performance index values ​​of each candidate optional component;

[0215] A target option that meets the target operating parameters is determined from candidate options based on the values ​​of each performance indicator.

[0216] In one embodiment, when the computer program is executed by a processor, the following steps are also implemented:

[0217] Generate a whole machine parts combination that matches the target optional parts, and performance difference data between the whole machine parts combination and the current whole machine parts combination of the unit;

[0218] Adjust the optional accessories for each operating point of the unit based on the performance difference data.

[0219] In one embodiment, when the computer program is executed by a processor, the following steps are also implemented:

[0220] According to the target selection parts, determine the unit's operating index data at the target operating point;

[0221] Based on the operating index data, the evaluation data of the unit is obtained.

[0222] Those of ordinary skill in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be completed by instructing the relevant hardware through a computer program, and the computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to memory, storage, database or other media used in the embodiments provided in this application can include at least one of non-volatile and volatile memory. Non-volatile memory may include read-only memory (ROM), magnetic tape, floppy disk, flash memory or optical memory, etc. Volatile memory may include random access memory (RAM) or external cache memory. As an illustration and not limitation, RAM can be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM).

[0223] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0224] The above embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the attached claims.

Claims

1. A method for selecting a central air conditioner model, characterized in that: The method comprises: When it is detected that there is at least one target operating point that needs to be updated in the operation of the central air-conditioning unit, the target operating parameters of the unit under the target operating point are determined; the target operating parameters refer to the operating parameters of the unit under the special operating point or the normal operating point; Generating selection instructions for the required optional parts at the target operating point according to the target operating parameters; In response to the selection instruction, when there is no option in the selection database that meets the target operating parameter, a parameter correction instruction of the parameter to be corrected is generated; In response to the parameter correction instruction, determining a parameter correction mode and a correction coefficient; Based on the parameter correction mode, determining a target optional part that meets the target operating parameter according to the accessory type and correction coefficient of the required optional part; Wherein, responding to the parameter correction instruction, determining the parameter correction mode and the correction coefficient includes: responding to the parameter correction instruction, determining a first parameter correction mode and a first correction coefficient; The determining, based on the parameter correction mode and according to the accessory type and correction coefficient of the required optional accessory, the target optional accessory that meets the target operating parameters includes: based on the first parameter correction mode, correcting the original selection parameters corresponding to the accessory type of the required optional accessory according to the first correction coefficient to obtain corrected selection parameters; determining the target optional accessory that meets the target operating parameters according to the corrected selection parameters; Alternatively, the determining the parameter correction mode and the correction coefficient in response to the parameter correction instruction includes: determining a second parameter correction mode and a second correction parameter in response to the parameter correction instruction; The method of determining the target optional parts that meet the target operating parameters based on the parameter correction mode and according to the accessory type and correction coefficient of the required optional parts includes: obtaining the actual operating parameters of the unit under the target operating conditions based on the second parameter correction mode; taking the ratio of the actual operating parameters to the target operating parameters as a second correction coefficient; correcting the original selection parameters corresponding to the accessory type of the required optional parts according to the second correction coefficient to obtain corrected selection parameters; and determining the target optional parts that meet the target operating parameters according to the corrected selection parameters.

2. The method according to claim 1, characterized in that When it is detected that there is at least one target operating point that needs to be updated during the operation of the central air conditioner unit, determining the target operating parameters of the unit at the target operating point includes: When it is detected that there is at least one target operating point that needs to be updated in all operating conditions of the central air-conditioning unit, the target operating parameters of the unit under the target operating point are determined; the all operating conditions include normal operating points and special operating points of the central air-conditioning unit.

3. The method according to claim 1, characterized in that The step of determining, based on the parameter correction mode and according to the accessory type and correction coefficient of the required optional accessories, a target optional accessory that meets the target operating parameter includes: Based on the parameter correction mode, determining at least one candidate optional component that meets the target operating parameter according to the component type and correction coefficient of the required optional component; Obtaining the performance index value of each candidate optional component; A target optional component that meets the target operating parameters is determined from the candidate optional components according to each of the performance indicator values.

4. The method according to any one of claims 1 to 3, characterized in that: The method further comprises: Generate a whole machine accessory combination matching the target optional parts, and performance difference data between the whole machine accessory combination and the current whole machine accessory combination of the unit; The optional accessories for each operating point of the unit are adjusted according to the performance difference data.

5. The method according to claim 1, characterized in that The method further comprises: Determining the operating index data of the unit at the target operating point according to the target optional parts; Evaluation data of the unit is obtained according to the operation index data.

6. The method according to claim 5, characterized in that The method further comprises: Based on the evaluation data, the overall performance of the whole machine and various parameter indicators are determined.

7. A central air conditioner model selection system, characterized in that: The system comprises: A detection module, for determining target operating parameters of the unit at the target operating point when it is detected that the unit of the central air conditioner has at least one target operating point that needs to be updated; the target operating parameters refer to operating parameters of the unit at a special operating point or a normal operating point; An instruction generation module is used to generate a selection instruction of the optional parts required at the target operating point according to the target operating parameters; in response to the selection instruction, when there is no optional part that meets the target operating parameters in the selection database, generate a parameter correction instruction of the parameter to be corrected; A response module, used for responding to the parameter correction instruction and determining a parameter correction mode and a correction coefficient; A selection module, for determining a target optional part that meets the target operating parameters based on the parameter correction mode and the accessory type and correction coefficient of the required optional part; Wherein, the system further comprises: a parameter correction module and an acquisition module; The response module is further used to respond to the parameter correction instruction and determine a first parameter correction mode and a first correction coefficient; the parameter correction module is used to correct the original selection parameters corresponding to the accessory type of the required optional accessory according to the first correction coefficient based on the first parameter correction mode to obtain the corrected selection parameters; the selection module is further used to determine the target optional accessory that meets the target operating parameters according to the corrected selection parameters; Alternatively, the response module is further used to respond to the parameter correction instruction to determine a second parameter correction mode and a second correction parameter; the acquisition module is used to acquire the actual operating parameters of the unit under the target operating conditions based on the second parameter correction mode; the parameter correction module is used to use the ratio of the actual operating parameters to the target operating parameters as a second correction coefficient; the original selection parameters corresponding to the accessory type of the required optional accessories are corrected according to the second correction coefficient to obtain the corrected selection parameters; the selection module is further used to determine the target optional accessories that meet the target operating parameters according to the corrected selection parameters.

8. The system according to claim 7, characterized in that The detection module is further used for: When it is detected that there is at least one target operating point that needs to be updated in all operating conditions of the central air-conditioning unit, the target operating parameters of the unit under the target operating point are determined; the all operating conditions include normal operating points and special operating points of the central air-conditioning unit.

9. The system according to claim 7, characterized in that The acquisition module is further configured to determine, based on the parameter correction mode and according to the accessory type and correction coefficient of the required optional accessory, at least one candidate optional accessory that meets the target operating parameter; Obtaining the performance index value of each candidate optional component; The selection module is also used to determine a target option that meets the target operating parameters from the candidate options according to the performance indicator values.

10. A computer device comprising a memory and a processor, wherein the memory stores a computer program, characterized in that: When the processor executes the computer program, the steps of the method according to any one of claims 1 to 6 are implemented.

11. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 6 are implemented.

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