Energy consumption evaluation method and system for multi-blade centrifugal fan

Abstract

The present invention discloses an energy consumption evaluation method and system for a multi-blade centrifugal fan, and relates to the technical field of fan energy saving. The method comprises: obtaining historical fan performance parameters, fan structural parameters, environmental parameters and actual fan performance parameters of the multi-blade centrifugal fan; generating a fan performance curve based on the historical fan performance parameters; calculating the first fan efficiency, calculating the second fan efficiency and the comprehensive fan efficiency; comparing and analyzing the comprehensive fan efficiency with the fan performance curve and evaluating the fan energy consumption; and performing energy-saving regulation based on the evaluation results. Starting from the actual operation of the multi-blade centrifugal fan and the changes in the operating environment, the present invention analyzes the changes in the fan energy consumption by comparing the actual energy consumption with the historical data, thereby performing a comprehensive evaluation of the overall operation of the fan, and improving the performance of the fan and reducing energy consumption through early warning prompts and energy consumption regulation, thereby improving the operating efficiency of the fan and ensuring the comprehensiveness and reliability of the energy consumption evaluation.

Description

Technical Field

[0001] The present invention belongs to the technical field of fan energy saving, and in particular relates to an energy consumption evaluation method and system for a multi-blade centrifugal fan. Background Art

[0002] Multi-blade centrifugal fan is a common type of fan, widely used in various ventilation and air circulation occasions. Its basic principle is to suck air from the center of the fan through the rotating impeller, and then discharge the air outward through centrifugal force, so as to achieve air pressurization and flow, involving the conversion of kinetic energy into static pressure energy. The main components of multi-blade centrifugal fan include impeller: composed of multiple curved blades, which generate centrifugal force when rotating to push air to the outside of the fan; volute (fan housing): the outer shell surrounding the impeller, usually in a spiral shape, responsible for guiding air from the impeller to the exhaust port and distributing it to the duct system; air inlet, exhaust port, motor and supporting structure.

[0003] In terms of energy consumption and efficiency, the energy consumption of a multi-blade centrifugal fan mainly depends on the fan design, speed, shape of the impeller and the resistance of the system. Higher air volume and air pressure usually lead to higher energy consumption; while the efficiency of the fan can be improved by optimizing the design and reasonably selecting the fan specifications.

[0004] At present, the design of fans usually considers reducing energy consumption and improving overall efficiency, such as using efficient motors, improving impeller design and reducing air flow resistance. Therefore, how to evaluate the energy consumption of multi-blade centrifugal fans from an overall perspective has become an urgent problem to be solved. Summary of the invention

[0005] The object of the present invention is to provide an energy consumption evaluation method and system for a multi-blade centrifugal fan, which can be achieved by the following technical solutions:

[0006] In a first aspect, an embodiment of the present application provides an energy consumption evaluation method for a multi-blade centrifugal fan, comprising the following steps:

[0007] Obtain historical fan performance parameters, fan structure parameters and operating environment parameters of multi-blade centrifugal fans;

[0008] generating a fan performance curve based on the historical fan performance parameters;

[0009] Obtain actual fan performance parameters according to the environmental parameters when the multi-blade centrifugal fan is running;

[0010] Calculating a first fan efficiency based on the fan structural parameters;

[0011] Calculating a second fan efficiency based on the actual fan performance parameter;

[0012] generating a comprehensive fan efficiency according to the first fan efficiency and the second fan efficiency;

[0013] Comparing and analyzing the comprehensive fan efficiency with the fan performance curve and evaluating the fan energy consumption;

[0014] Provide early warning and energy-saving control based on energy consumption assessment results;

[0015] The comprehensive fan efficiency is expressed as: = + ;

[0016] Indicates the efficiency of the first fan; represents the efficiency of the second fan;

[0017] And the first fan efficiency is expressed as: ;

[0018] Where V represents the volume flow rate at the inlet and outlet of the fan; represents the actual wind pressure; M represents the impeller torque; ω represents the impeller rotation angular velocity;

[0019] And the second fan efficiency is expressed as: ;

[0020] Among them, Q represents the actual air volume; P represents the actual input power; Indicates the mechanical efficiency of the fan; Indicates the motor efficiency of the fan.

[0021] Preferably, the historical wind turbine performance parameters include historical wind volume, historical wind pressure, and historical input power;

[0022] The actual fan performance parameters include actual air volume, actual wind pressure, and actual input power;

[0023] The fan structural parameters include impeller torque and impeller rotation angular velocity;

[0024] The environmental parameters include temperature, humidity and fan resistance.

[0025] Preferably, generating the fan performance curve specifically comprises the following steps:

[0026] Install anemometers at the fan inlet and outlet and measure and record the wind speed and air volume at different fan loads;

[0027] Install pressure sensors at the fan inlet and outlet respectively and measure and record the wind pressure at the fan inlet and outlet under different fan loads;

[0028] Install a power meter at the fan power supply end to measure and record the fan input power at different air volumes and pressures;

[0029] Measure and record data multiple times at multiple time points and aggregate them into historical parameter data sets;

[0030] Drawing the wind turbine performance curve based on the historical parameter data set;

[0031] Among them, input power represents the actual electrical power consumption of the fan;

[0032] The fan performance curve includes an air volume-wind pressure curve, an air volume-power curve and a wind pressure-power curve.

[0033] Preferably, obtaining the actual fan performance parameter specifically comprises the following steps:

[0034] Calculate the initial air density, expressed as: ;

[0035] in, represents the initial air density; p represents the total air pressure; R represents the gas constant of air; T represents the absolute temperature;

[0036] The initial air density is corrected according to the temperature and humidity to obtain the actual air density in the current environment, which is expressed as: ;

[0037] in, Indicates the actual air density; Indicates the partial pressure of dry air; Indicates the partial pressure of moist air; represents the gas constant of dry air;

[0038] Partial pressure of moist air It is expressed as: ;

[0039] Where, e represents the saturated water vapor pressure; RH represents the relative humidity;

[0040] Partial pressure of dry air It is expressed as: ;

[0041] The actual air volume is calculated based on the actual air density, expressed as: ;

[0042] The actual wind pressure is calculated based on the fan resistance and is expressed as: ; Indicates fan resistance;

[0043] The actual input power is calculated based on the actual air density and is expressed as: ;

[0044] in, Indicates the initial efficiency of the fan.

[0045] Preferably, evaluating the fan energy consumption comprises the following steps:

[0046] Marking the fan efficiencies of several fan operating conditions on the fan performance curve in time series, including the highest fan efficiency, the lowest fan efficiency and the average fan efficiency;

[0047] Monitor and record the fan efficiency of several fan operating conditions online in real time, and summarize the fan operating conditions when the fan efficiency is lower than the average fan efficiency as a low-efficiency operating point set; summarize the fan operating conditions when the fan efficiency is higher than the average fan efficiency as a high-efficiency operating point set; summarize the fan operating conditions when the fan efficiency is equal to the average fan efficiency as an average efficiency operating point set;

[0048] Drawing operating point efficiency diagrams based on a low-efficiency operating point set, a high-efficiency operating point set and an average-efficiency operating point set respectively; the operating point efficiency diagrams include an operating point low-efficiency diagram, an operating point high-efficiency diagram and an operating point average efficiency diagram;

[0049] Put the comprehensive fan efficiency into the operating point efficiency diagram for comparative analysis;

[0050] Based on the analysis results, the actual energy consumption of the fan is evaluated and the energy consumption evaluation results are output, specifically:

[0051] If the comprehensive fan efficiency is in the low efficiency diagram of the operating point, the actual energy consumption of the multi-blade centrifugal fan is evaluated as high energy consumption, and the output energy consumption evaluation result is low efficiency and high energy consumption;

[0052] If the comprehensive fan efficiency is in the high efficiency diagram of the operating point, the actual energy consumption of the multi-blade centrifugal fan is evaluated to be low energy consumption, and the output energy consumption evaluation result is high efficiency and low energy consumption;

[0053] If the comprehensive fan efficiency is located in the average efficiency diagram of the operating point, the actual energy consumption of the multi-blade centrifugal fan is evaluated as the average energy consumption, and the output energy consumption evaluation result is the average efficiency average energy consumption.

[0054] Preferably, early warning and energy-saving regulation are carried out according to the energy consumption assessment results, including the following contents:

[0055] If the energy consumption evaluation result is low efficiency and high energy consumption, an early warning will be issued and the fan performance parameters and fan structure parameters will be optimized, and variable control will be performed on the environmental parameters during operation;

[0056] If the energy consumption assessment result is high efficiency and low energy consumption, the fan speed is adjusted according to actual demand and the fan is kept running at the fan operating point with the highest fan efficiency;

[0057] If the energy consumption assessment result is average efficiency and average energy consumption, the fan performance parameters are optimized or the fan structure parameters are adjusted according to actual needs.

[0058] In a second aspect, an embodiment of the present application provides an energy consumption evaluation system for a multi-blade centrifugal fan, which is applied to the energy consumption evaluation method as described above, and includes:

[0059] A parameter acquisition module is used to obtain historical fan performance parameters, fan structural parameters and operating environment parameters of the multi-blade centrifugal fan; and is also used to obtain actual fan performance parameters according to the operating environment parameters of the multi-blade centrifugal fan;

[0060] a performance calculation module, generating a fan performance curve based on the historical fan performance parameters; calculating a first fan efficiency based on the fan structural parameters; calculating a second fan efficiency based on the actual fan performance parameters; and generating a comprehensive fan efficiency based on the first fan efficiency and the second fan efficiency;

[0061] A performance analysis module, used for comparing and analyzing the comprehensive fan efficiency with the fan performance curve and evaluating the fan energy consumption;

[0062] The early warning and control module is used to provide early warning prompts and energy-saving control based on the energy consumption assessment results.

[0063] The beneficial effects of the present invention are:

[0064] (1) The present invention starts from the actual operation of the multi-blade centrifugal fan and the changes in the operating environment, analyzes the changes in the fan energy consumption by comparing the actual energy consumption with the energy consumption of historical data, thereby making a comprehensive assessment of the overall operation of the fan, and uses the energy consumption assessment results to provide early warning prompts and energy consumption regulation to improve the performance of the fan and reduce energy consumption, thereby improving the operating efficiency of the fan and ensuring the comprehensiveness and reliability of the energy consumption assessment.

[0065] (2) The present invention first obtains historical fan performance parameters, fan structural parameters and environmental parameters during operation of a multi-blade centrifugal fan; secondly, generates a fan performance curve based on the historical fan performance parameters; then obtains actual fan performance parameters based on the environmental parameters during operation of the multi-blade centrifugal fan; then calculates a first fan efficiency based on the fan structural parameters, and calculates a second fan efficiency based on the actual fan performance parameters, and then generates a comprehensive fan efficiency based on the first fan efficiency and the second fan efficiency; then compares and analyzes the comprehensive fan efficiency with the fan performance curve and evaluates the actual energy consumption of the fan; finally, based on the energy consumption evaluation result, performs early warning prompts and energy-saving regulation for different levels, thereby comprehensively evaluating the energy efficiency of the multi-blade centrifugal fan, and taking corresponding measures to improve the performance of the fan and reduce energy consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0066] For better understanding and implementation, the technical solution of the present application is described in detail below with reference to the accompanying drawings.

[0067] Figure 1 A flowchart of the steps of an energy consumption evaluation method for a multi-blade centrifugal fan provided in an embodiment of the present application;

[0068] Figure 2 A flow chart of the steps for generating a fan performance curve provided in an embodiment of the present application;

[0069] Figure 3 A flowchart of the steps for obtaining actual fan performance parameters provided in an embodiment of the present application;

[0070] Figure 4 A flowchart of the steps for evaluating fan energy consumption provided in an embodiment of the present application;

[0071] Figure 5 A schematic structural diagram of an energy consumption assessment system for a multi-blade centrifugal fan provided in an embodiment of the present application. DETAILED DESCRIPTION

[0072] In order to further explain the technical means and effects taken by the present invention to achieve the predetermined invention purpose, exemplary embodiments will be described in detail here, and examples thereof are shown in the accompanying drawings. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The implementations described in the following exemplary embodiments do not represent all implementations consistent with the present application. Instead, they are only examples of methods and systems consistent with some aspects of the present application as detailed in the attached claims.

[0073] The terms used in this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The singular forms of "a", "said" and "the" used in this application and the appended claims are also intended to include plural forms unless the context clearly indicates other meanings. It should also be understood that the term "and / or" used in this article refers to any or all possible combinations of one or more associated listed items.

[0074] The specific implementation methods, features and effects of the present invention are described in detail below in conjunction with the accompanying drawings and preferred embodiments.

[0075] Example 1

[0076] See also Figure 1 The present application provides an energy consumption evaluation method for a multi-blade centrifugal fan, comprising the following steps:

[0077] S1, obtaining historical fan performance parameters, fan structure parameters and operating environment parameters of the multi-blade centrifugal fan;

[0078] S2, generating a fan performance curve based on the historical fan performance parameters;

[0079] S3, obtaining actual fan performance parameters according to the environmental parameters when the multi-blade centrifugal fan is running;

[0080] S4, calculating a first fan efficiency based on the fan structural parameters;

[0081] S5, calculating a second fan efficiency based on the actual fan performance parameter;

[0082] S6, generating a comprehensive fan efficiency according to the first fan efficiency and the second fan efficiency;

[0083] S7, comparing and analyzing the comprehensive fan efficiency with the fan performance curve and evaluating the fan energy consumption;

[0084] S8, provides early warning and energy-saving regulation based on the energy consumption assessment results.

[0085] Specifically, in order to avoid reducing the energy consumption of a multi-blade centrifugal fan, this embodiment starts from the actual operating conditions of the multi-blade centrifugal fan and changes in the operating environment, and analyzes changes in the fan energy consumption by comparing the actual energy consumption with the energy consumption of historical data, thereby conducting a comprehensive assessment of the overall operating conditions of the fan, and using the energy consumption assessment results to provide early warning prompts and energy consumption regulation to improve the performance of the fan and reduce energy consumption, thereby improving the operating efficiency of the fan and ensuring the comprehensiveness and reliability of the energy consumption assessment. Specifically: first, the historical fan performance parameters, fan structure parameters and environmental parameters during operation of the multi-blade centrifugal fan are obtained; secondly, a fan performance curve is generated based on the historical fan performance parameters; then, the actual fan performance parameters are obtained according to the environmental parameters during operation of the multi-blade centrifugal fan; then, the first fan efficiency is calculated based on the fan structure parameters, and the second fan efficiency is calculated based on the actual fan performance parameters, and then a comprehensive fan efficiency is generated according to the first fan efficiency and the second fan efficiency; then, the comprehensive fan efficiency is compared and analyzed with the fan performance curve and the actual energy consumption of the fan is evaluated; finally, early warning prompts and energy-saving regulation are performed for different levels according to the energy consumption evaluation results, so as to comprehensively evaluate the energy efficiency of the multi-blade centrifugal fan, and take corresponding measures to improve the performance of the fan and reduce energy consumption.

[0086] It can be understood that the first fan efficiency mentioned above takes the fan structural parameters as the main consideration, while the second fan efficiency takes the actual fan performance parameters as the main consideration.

[0087] In an embodiment provided in the present application, the historical wind turbine performance parameters include historical wind volume, historical wind pressure, and historical input power;

[0088] The actual fan performance parameters include actual air volume, actual wind pressure, and actual input power;

[0089] The fan structural parameters include impeller torque and impeller rotation angular velocity;

[0090] The environmental parameters include temperature, humidity and fan resistance.

[0091] Specifically, in the above data obtained in this embodiment, the historical fan performance parameters refer to the basic parameters of the fan performance before the current monitoring time node, which can be used to show the change of the fan performance based on the time axis, mainly including the historical air volume, historical wind pressure and historical input power; the actual fan performance parameters refer to the real-time basic parameters of the fan performance measured by various means at the current monitoring time node, which are mainly used to reflect the current change of the fan performance, including the actual air volume, the actual wind pressure and the actual input power; the fan structure parameters refer to the basic parameters of the fan structure itself, such as the impeller torque and the impeller rotation angular velocity, which are mainly used to reflect the influence and effect of the structure of the multi-blade centrifugal fan itself on the energy consumption; the environmental parameters refer to the parameter changes under the current fan operating environment, mainly including temperature, humidity and fan resistance, and it should be noted that temperature and humidity will affect the air density, thereby affecting the air volume and power of the fan, and the lower the air density, the larger the air volume of the fan is usually, but the power demand may also increase, so in this embodiment, the temperature and humidity can also be represented by the air density, and the change of the air density is reflected by collecting the temperature and humidity data.

[0092] like Figure 2 As shown, in an embodiment provided in the present application, generating the fan performance curve specifically includes the following steps:

[0093] Install anemometers at the fan inlet and outlet and measure and record the wind speed and air volume at different fan loads;

[0094] Install pressure sensors at the fan inlet and outlet respectively and measure and record the wind pressure at the fan inlet and outlet under different fan loads;

[0095] Install a power meter at the fan power supply end to measure and record the fan input power at different air volumes and pressures;

[0096] Measure and record the above data multiple times at multiple time points and summarize them into a historical parameter data set;

[0097] Drawing the wind turbine performance curve based on the historical parameter data set;

[0098] Among them, input power represents the actual electrical power consumption of the fan;

[0099] The fan performance curve includes an air volume-wind pressure curve, an air volume-power curve and a wind pressure-power curve.

[0100] Specifically, this embodiment generates a fan performance curve based on the above historical fan performance parameters, specifically: an anemometer is installed at the fan inlet and outlet respectively, and the wind speed and air volume at the fan inlet and outlet are measured and recorded under different fan loads; a pressure sensor is installed at the fan inlet and outlet respectively, and the wind pressure at the fan inlet and outlet is measured and recorded under different fan loads; a power meter is installed at the fan power supply end to measure and record the input power of the fan under different wind volumes and wind pressures; the above data are measured and recorded multiple times at multiple time nodes and summarized as a historical parameter data set; and a fan performance curve is generated based on the historical parameter data set. This embodiment measures and records the wind speed, wind volume, wind pressure and power under different fan loads at multiple time nodes, and summarizes the data into a historical parameter data set after data calibration and correction to ensure the consistency and accuracy of the data; finally, the fan performance curve is drawn based on the above data, and the fan performance curve includes a wind volume-wind pressure curve, a wind volume-power curve and a wind pressure-power curve. This embodiment measures and records the performance parameter changes of the fan under different loads in detail and draws the performance curve of the fan, thereby providing data support for the subsequent evaluation and optimization of the fan. It should be noted that because the above data are obtained based on multiple time nodes, the above data are all historical data, that is, historical fan performance parameters.

[0101] like Figure 3 As shown, in an embodiment provided in the present application, obtaining the actual wind turbine performance parameters specifically includes the following steps:

[0102] S31, calculate the initial air density, expressed as: ;

[0103] in, represents the initial air density; p represents the total air pressure; R represents the gas constant of air; T represents the absolute temperature; it can be converted through Celsius temperature TC to obtain T=TC+273.15;

[0104] S32, correcting the initial air density according to the temperature and humidity to obtain the actual air density in the current environment, expressed as: ;

[0105] in, Indicates the actual air density; Indicates the partial pressure of dry air; Indicates the partial pressure of moist air; represents the gas constant of dry air;

[0106] Partial pressure of moist air It is expressed as: ;

[0107] e represents the saturated water vapor pressure, which can be calculated using the temperature. The formula is: ; RH is relative humidity;

[0108] The partial pressure of dry air It is expressed as: ;

[0109] S33, calculates the actual air volume based on the actual air density, expressed as: ;

[0110] Where Q represents the actual air volume; V represents the volume flow rate at the inlet and outlet of the fan;

[0111] S34, calculates the actual wind pressure based on the fan resistance, expressed as: ; Indicates fan resistance;

[0112] S35, calculates the actual input power based on the actual air density, expressed as: ;

[0113] Where, P represents the actual input power; Indicates the actual wind pressure of the fan; Indicates the initial efficiency of the fan.

[0114] It should be noted that, since the wind pressure of the fan must overcome the resistance inside the fan to maintain air flow, the actual wind pressure of the fan in this embodiment is equal to the fan resistance, and the actual wind pressure is also equal to the fan outlet pressure minus the fan inlet pressure, that is: =Fan outlet pressure - fan inlet pressure.

[0115] It is understandable that the above V represents the volume flow rate of the fan inlet and outlet, and Q represents the actual air volume. Although the "volume flow rate of the fan inlet and outlet" and "air volume" usually refer to the same concept, both can represent "the volume of air passing through the fan per unit time", but because the first fan efficiency and the second fan efficiency are calculated based on different fan parameters (V is based on the fan structure parameters, and Q is based on the fan performance parameters), and there will definitely be a certain difference between the actual air volume and the volume flow rate of the inlet and outlet under ideal conditions, the two are not completely equivalent, so in this application, the two are represented by different symbols and parameters to distinguish them. On the other hand, according to the calculation formula of the actual air volume It can be seen that the actual air volume is the result of dividing the volume flow rate of the fan inlet and outlet by the actual air density in the current environment, that is, the actual air volume is the result of the volume flow rate of the fan inlet and outlet after excluding the influence of the actual air density. Therefore, in this embodiment, the volume flow rate V of the fan inlet and outlet and the actual air volume Q are two different parameters, expressing two different concepts.

[0116] In an embodiment provided in the present application, the first fan efficiency is calculated and expressed as:

[0117] ;

[0118] in, represents the first fan efficiency; M represents the impeller torque; ω represents the impeller rotation angular velocity.

[0119] Specifically, the impeller torque and impeller rotation angular velocity of the fan are important parameters for fan performance and design. They describe the mechanical action and motion state of the fan impeller during operation. Impeller torque is the rotational moment acting on the fan impeller, measured in Newton meters (N·m). It determines how much force the motor needs to drive the fan impeller to rotate. It is a key factor affecting fan performance and energy efficiency, and can be expressed as: ; The impeller angular velocity refers to the angle at which the impeller rotates per second, in radians per second (rad / s), which can be expressed as: The product of the impeller torque and the angular velocity is equal to the output power. The greater the torque, the greater the power that can be generated when the impeller rotates. This embodiment takes the fan structural parameters into consideration and uses the impeller torque and the impeller rotation angular velocity as the second calculation factor of the first fan efficiency, which helps to optimize the design and operation of the fan to improve performance and efficiency.

[0120] In an embodiment provided in the present application, the second fan efficiency is calculated and expressed as:

[0121] ;

[0122] in, represents the efficiency of the second fan; Indicates the mechanical efficiency of the fan; Indicates the motor efficiency of the fan.

[0123] Specifically, the mechanical efficiency of a fan refers to the ability of the fan to convert the energy provided by the motor into wind pressure and air volume, which can be expressed as = ; The motor efficiency of the fan refers to the ability of the motor to convert electrical energy into mechanical energy, which can be expressed as: = , where the aerodynamic power of the fan is the product of the wind pressure and air volume generated by the fan; the input power of the fan refers to the total power provided to the fan by the motor or drive system, which represents the electrical energy consumed by the fan system during operation and is used to drive the fan to rotate, thereby generating wind pressure and air volume; the input power of the motor is the power obtained by the motor from the power supply; the output power of the motor refers to the mechanical power actually provided by the motor to the load (such as the fan) during operation, which represents the part of the motor that converts electrical energy into mechanical energy and is used to drive the fan or other equipment; a higher mechanical efficiency means that the fan has a better aerodynamic design and can effectively convert the input mechanical energy into airflow energy; a higher motor efficiency means that the motor can efficiently convert electrical energy into mechanical energy and reduce energy loss. In this embodiment, the actual efficiency of the fan takes into account the entire energy conversion process from the power supply to the fan, including the process of converting the electrical energy of the motor into mechanical energy, and then converting the mechanical energy into airflow energy by the fan. Therefore, using the mechanical efficiency of the fan and the motor efficiency as two calculation factors for the actual efficiency may make the actual efficiency calculated in this embodiment more reliable and able to reflect the aerodynamic performance of the fan in actual operation relative to its theoretical maximum possible output.

[0124] In an embodiment provided in the present application, the comprehensive fan efficiency is calculated and expressed as: = + .

[0125] Specifically, this embodiment combines the first fan efficiency obtained from the fan structural parameters and the second fan efficiency obtained from the actual fan performance parameters as the comprehensive fan efficiency of the fan, so as to ensure that the final fan efficiency reaches the maximum and most accurate value that can actually be achieved, thereby providing accurate and comprehensive data support for subsequent energy consumption analysis.

[0126] It should be noted that since the above-mentioned first fan efficiency and the second fan efficiency are calculated based on different fan parameters respectively, although the formulas may involve the same parameters or parameter types, the properties expressed in different formulas are not necessarily the same, and the values ​​obtained by the calculation are not necessarily the same. For example, air volume, wind pressure, output power or input power are also involved in both calculation formulas, but their specific expression properties and the values ​​used need to be determined based on specific fan parameters (fan structure parameters and fan performance parameters).

[0127] like Figure 4 As shown, in one embodiment provided in the present application, evaluating the fan energy consumption includes the following steps:

[0128] The fan efficiency at a plurality of fan operating condition points is marked on the fan performance curve in a time series, including the maximum fan efficiency, the minimum fan efficiency and the average fan efficiency;

[0129] Monitor and record the fan efficiency of several fan operating conditions online in real time, and summarize the fan operating conditions when the fan efficiency is lower than the average fan efficiency as a low-efficiency operating point set; summarize the fan operating conditions when the fan efficiency is higher than the average fan efficiency as a high-efficiency operating point set; summarize the fan operating conditions when the fan efficiency is equal to the average fan efficiency as an average efficiency operating point set;

[0130] Drawing operating point efficiency diagrams based on a low-efficiency operating point set, a high-efficiency operating point set and an average-efficiency operating point set respectively; the operating point efficiency diagrams include an operating point low-efficiency diagram, an operating point high-efficiency diagram and an operating point average efficiency diagram;

[0131] Put the comprehensive fan efficiency into the operating point efficiency diagram for comparative analysis;

[0132] Based on the analysis results, the actual energy consumption of the fan is evaluated and the energy consumption evaluation results are output, specifically:

[0133] If the comprehensive fan efficiency is in the low efficiency diagram of the operating point, the actual energy consumption of the multi-blade centrifugal fan is evaluated as high energy consumption, and the output energy consumption evaluation result is low efficiency and high energy consumption;

[0134] If the comprehensive fan efficiency is in the high efficiency diagram of the operating point, the actual energy consumption of the multi-blade centrifugal fan is evaluated to be low energy consumption, and the output energy consumption evaluation result is high efficiency and low energy consumption;

[0135] If the comprehensive fan efficiency is located in the average efficiency diagram of the operating point, the actual energy consumption of the multi-blade centrifugal fan is evaluated as the average energy consumption, and the output energy consumption evaluation result is the average efficiency average energy consumption.

[0136] In an embodiment provided in the present application, early warning prompts and energy-saving regulation are performed according to the energy consumption evaluation results, including the following contents:

[0137] If the energy consumption evaluation result is low efficiency and high energy consumption, an early warning will be issued and the fan performance parameters and fan structure parameters will be optimized, and variable control will be performed on the environmental parameters during operation;

[0138] If the energy consumption assessment result is high efficiency and low energy consumption, the fan speed is adjusted according to actual demand and the fan is kept running at the fan operating point with the highest fan efficiency;

[0139] If the energy consumption assessment result is average efficiency and average energy consumption, the fan performance parameters are optimized or the fan structure parameters are adjusted according to actual needs.

[0140] Specifically, in the present embodiment, under conditions of different fan efficiencies and energy consumptions, energy-saving regulation is performed for fan systems of low efficiency and high energy consumption, high efficiency and low energy consumption, and average efficiency and average energy consumption. When the fan is of low efficiency and high energy consumption, it means that the fan efficiency is low and the energy consumption is high. At this time, an early warning prompt is required and the performance operating parameters of the fan, such as the fan speed and air volume, are checked and optimized to match actual needs. The fan can also be checked and cleaned regularly to keep the fan and system components (such as filters, impellers, etc.) in good condition to reduce energy consumption. Other parts of the fan system, such as pipeline layout, valve settings, etc., can also be checked and optimized to reduce resistance and improve overall efficiency. When the fan is of high efficiency and low energy consumption, it means that the fan efficiency is high and the energy consumption is low. In this case, the fan is in good operating condition but may still There is room for further optimization, such as adjusting the fan speed according to actual needs to further reduce energy consumption; or regularly evaluating and optimizing the operating conditions of the fan system to ensure that it always operates at the optimal efficiency point; or recycling and reusing waste heat in the system to further improve the energy efficiency of the system; the fan operation status can also be monitored in real time to detect potential problems in advance to reduce unnecessary energy consumption; when the fan has average efficiency and average energy consumption, it means that the fan efficiency and energy consumption are at a medium level. In this case, the fan system needs to be comprehensively considered and optimized, such as optimizing pipeline design, improving fan operating conditions, improving impeller design, using variable frequency speed regulation, etc.; the fan and related system components can also be regularly maintained and cleaned to keep them in the best condition to prevent efficiency loss due to wear or blockage. Through the above measures, this embodiment can effectively improve the energy efficiency of the fan system and reduce operating costs, while also meeting the requirements of sustainable development.

[0141] Example 2

[0142] See also Figure 5 The embodiment of the present application provides an energy consumption evaluation system for a multi-blade centrifugal fan, which is applied to the energy consumption evaluation method for a multi-blade centrifugal fan as described above, including:

[0143] A parameter acquisition module is used to obtain historical fan performance parameters, fan structural parameters and operating environment parameters of the multi-blade centrifugal fan; and is also used to obtain actual fan performance parameters according to the operating environment parameters of the multi-blade centrifugal fan;

[0144] a performance calculation module, generating a fan performance curve based on the historical fan performance parameters; calculating a first fan efficiency based on the fan structural parameters; calculating a second fan efficiency based on the actual fan performance parameters; and generating a comprehensive fan efficiency based on the first fan efficiency and the second fan efficiency;

[0145] A performance analysis module, used for comparing and analyzing the comprehensive fan efficiency with the fan performance curve and evaluating the fan energy consumption;

[0146] The early warning and control module is used to provide early warning prompts and energy-saving control based on the energy consumption assessment results.

[0147] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described or recorded in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0148] The technicians in the relevant field can clearly understand that for the convenience and simplicity of description, only the division of the above-mentioned functional units and modules is used as an example for illustration. In practical applications, the above-mentioned function allocation can be completed by different functional units and modules as needed, that is, the internal structure of the device can be divided into different functional units or modules to complete all or part of the functions described above. The functional units and modules in the embodiment can be integrated in a processing unit, or each unit can exist physically separately, or two or more units can be integrated in one unit. The above-mentioned integrated unit can be implemented in the form of hardware or in the form of software functional units. In addition, the specific names of the functional units and modules are only for the convenience of distinguishing each other, and are not used to limit the scope of protection of this application. The specific working process of the units and modules in the above-mentioned system can refer to the corresponding process in the aforementioned method embodiment, which will not be repeated here.

[0149] Those skilled in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of the present invention.

[0150] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technical personnel in this field can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A method for evaluating energy consumption of a multi-blade centrifugal fan, characterized in that: The steps include: Obtain historical fan performance parameters, fan structure parameters and operating environment parameters of multi-blade centrifugal fans; generating a fan performance curve based on the historical fan performance parameters; Obtain actual fan performance parameters according to the environmental parameters when the multi-blade centrifugal fan is running; Calculating a first fan efficiency based on the fan structural parameters; Calculating a second fan efficiency based on the actual fan performance parameter; generating a comprehensive fan efficiency according to the first fan efficiency and the second fan efficiency; Comparing and analyzing the comprehensive fan efficiency with the fan performance curve and evaluating the fan energy consumption; Provide early warning and energy-saving control based on energy consumption assessment results; The comprehensive fan efficiency is expressed as: = + ; Indicates the efficiency of the first fan; represents the efficiency of the second fan; And the first fan efficiency is expressed as: ; Where V represents the volume flow rate at the inlet and outlet of the fan; represents the actual wind pressure; M represents the impeller torque; ω represents the impeller rotation angular velocity; And the second fan efficiency is expressed as: ; Among them, Q represents the actual air volume; P represents the actual input power; Indicates the mechanical efficiency of the fan; Indicates the motor efficiency of the fan; The historical wind turbine performance parameters include historical wind volume, historical wind pressure, and historical input power; The actual fan performance parameters include actual air volume, actual wind pressure, and actual input power; The fan structural parameters include impeller torque and impeller rotation angular velocity; The environmental parameters include temperature, humidity and fan resistance; Generating the fan performance curve specifically includes the following steps: Install anemometers at the fan inlet and outlet and measure and record the wind speed and air volume at different fan loads; Install pressure sensors at the fan inlet and outlet respectively and measure and record the wind pressure at the fan inlet and outlet under different fan loads; Install a power meter at the fan power supply end to measure and record the fan input power at different air volumes and pressures; the input power represents the actual electrical power consumption of the fan; Measure and record data multiple times at multiple time points and aggregate them into historical parameter data sets; Drawing the fan performance curve based on the historical parameter data set; The fan performance curve includes an air volume-wind pressure curve, an air volume-power curve and a wind pressure-power curve.

2. The energy consumption evaluation method of a multi-blade centrifugal fan according to claim 1, characterized in that: Obtaining the actual fan performance parameters specifically includes the following steps: Calculate the initial air density, expressed as: ; in, represents the initial air density; p represents the total air pressure; R represents the gas constant of air; T represents the absolute temperature; The initial air density is corrected according to the temperature and humidity to obtain the actual air density in the current environment, which is expressed as: ; in, Indicates the actual air density; Indicates the partial pressure of dry air; Indicates the partial pressure of moist air; Represents the gas constant of dry air.

3. The energy consumption evaluation method of a multi-blade centrifugal fan according to claim 2, characterized in that: The partial pressure of moist air It is expressed as: ; Where, e represents the saturated water vapor pressure; RH represents the relative humidity; The partial pressure of dry air It is expressed as: .

4. The energy consumption evaluation method of a multi-blade centrifugal fan according to claim 3 is characterized in that: The initial air density is corrected according to the temperature and humidity to obtain the actual air density in the current environment, and then further includes: The actual air volume is calculated based on the actual air density, expressed as: ; The actual wind pressure is calculated based on the fan resistance and is expressed as: ; Indicates fan resistance; The actual input power is calculated based on the actual air density and is expressed as: ; in, Indicates the initial efficiency of the fan.

5. The energy consumption evaluation method of a multi-blade centrifugal fan according to claim 1, characterized in that: Evaluate fan energy consumption, including the following steps: Marking the fan efficiencies of several fan operating conditions on the fan performance curve in time series, including the highest fan efficiency, the lowest fan efficiency and the average fan efficiency; Monitor and record the fan efficiency of several fan operating conditions online in real time, and summarize the fan operating conditions when the fan efficiency is lower than the average fan efficiency as a low-efficiency operating point set; summarize the fan operating conditions when the fan efficiency is higher than the average fan efficiency as a high-efficiency operating point set; summarize the fan operating conditions when the fan efficiency is equal to the average fan efficiency as an average efficiency operating point set; Drawing operating point efficiency diagrams based on a low-efficiency operating point set, a high-efficiency operating point set and an average-efficiency operating point set respectively; the operating point efficiency diagrams include an operating point low-efficiency diagram, an operating point high-efficiency diagram and an operating point average efficiency diagram; Put the comprehensive fan efficiency into the operating point efficiency diagram for comparative analysis; Based on the analysis results, the actual energy consumption of the fan is evaluated and the energy consumption evaluation results are output, specifically: If the comprehensive fan efficiency is in the low efficiency diagram of the operating point, the actual energy consumption of the multi-blade centrifugal fan is evaluated as high energy consumption, and the output energy consumption evaluation result is low efficiency and high energy consumption; If the comprehensive fan efficiency is in the high efficiency diagram of the operating point, the actual energy consumption of the multi-blade centrifugal fan is evaluated to be low energy consumption, and the output energy consumption evaluation result is high efficiency and low energy consumption; If the comprehensive fan efficiency is located in the average efficiency diagram of the operating point, the actual energy consumption of the multi-blade centrifugal fan is evaluated as the average energy consumption, and the output energy consumption evaluation result is the average efficiency average energy consumption.

6. The energy consumption evaluation method of a multi-blade centrifugal fan according to claim 1, characterized in that: Provide early warning and energy-saving control based on energy consumption assessment results, including the following: If the energy consumption evaluation result is low efficiency and high energy consumption, an early warning will be issued and the fan performance parameters and fan structure parameters will be optimized, and variable control will be performed on the environmental parameters during operation; If the energy consumption assessment result is high efficiency and low energy consumption, the fan speed is adjusted according to actual demand and the fan is kept running at the fan operating point with the highest fan efficiency; If the energy consumption assessment result is average efficiency and average energy consumption, the fan performance parameters are optimized or the fan structure parameters are adjusted according to actual needs.

7. An energy consumption evaluation system for a multi-blade centrifugal fan, using the energy consumption evaluation method according to any one of claims 1 to 6, characterized in that: include: A parameter acquisition module is used to obtain historical fan performance parameters, fan structure parameters and operating environment parameters of the multi-blade centrifugal fan; It is also used to obtain actual fan performance parameters based on the environmental parameters during the operation of the multi-blade centrifugal fan; A performance calculation module, generating a fan performance curve based on the historical fan performance parameters; and calculating a first fan efficiency based on the fan structural parameters; Calculating a second fan efficiency based on the actual fan performance parameter; generating a comprehensive fan efficiency according to the first fan efficiency and the second fan efficiency; A performance analysis module, used for comparing and analyzing the comprehensive fan efficiency with the fan performance curve and evaluating the fan energy consumption; The early warning and control module is used to provide early warning prompts and energy-saving control based on the energy consumption assessment results.

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