A method and medium for evaluating economic operating conditions of a water supply system by introducing a specific work parameter

Abstract

The present application belongs to the technical field of water supply system evaluation, and discloses a method and medium for evaluating economic working conditions of a water supply system by introducing specific work parameters, comprising: judging whether a water supply unit of the water supply system is a centrifugal pump or a variable frequency unit; if the water supply unit of the water supply system is a centrifugal pump, calculating specific work of each flow point in a flow range of the centrifugal pump set to obtain a flow-specific work curve of the centrifugal pump set, and obtaining a device with the highest operation economy based on the flow-specific work curve of the centrifugal pump set; if the water supply unit of the water supply system is a variable frequency unit, calculating a flow-specific work curve of the variable frequency unit based on an energy consumption curve and a flow entropy diagram of the variable frequency unit; and obtaining an optimal operation point based on the flow-specific work curve of the variable frequency unit. The present application evaluates the economy of each parameter point of the pump by using specific work, and can effectively evaluate the economic working conditions of the water supply system.

Description

Technical Field

[0001] This invention belongs to the field of water supply system evaluation technology, and in particular relates to a method and medium for evaluating the economic operating conditions of a water supply system by introducing a specific work parameter. Background Technology

[0002] Currently, water supply systems are a crucial component of urban infrastructure, and their operational status directly impacts water resource utilization efficiency and energy consumption levels. In engineering practice, water supply systems typically consist of centrifugal pumps or variable frequency pump units, adjusting flow rate and head to meet varying water demands. To ensure stable system operation, engineering design and operation management usually analyze operating points based on parameters such as pump performance curves, system characteristic curves, and operating efficiency, and then optimize equipment selection and scheduling accordingly. Relevant research and engineering standards generally emphasize that pumps should operate within their so-called economic operating range over the long term, and that efficiency curves or power matching relationships should be used to compare different operating conditions to achieve energy-saving operation goals.

[0003] In existing technologies, a relatively close approach is to deduce pump performance curves from operational data and then use this data for energy consumption assessment and scheduling optimization. For example, existing technologies collect historical operational data from pumping stations, including flow rate, head, and power consumption information, and use performance curve models to calculate the operating characteristics of individual pumps, which are then further used for energy consumption assessment and optimized scheduling. The core of this type of method lies in establishing pump performance curves and combining them with operational data to analyze the operating status under different conditions, thereby providing a basis for the optimized operation of the water supply system.

[0004] However, the aforementioned existing technologies still primarily focus on efficiency curves, head-flow ratios, or total power consumption, and their evaluation logic essentially remains at the level of "equipment performance" or "total energy consumption." On the one hand, while pump efficiency can reflect energy conversion capability, its value exhibits a non-linear distribution with flow rate changes, and the efficiency curves of different devices lack uniform comparability, making it difficult to directly use for economic judgment across devices or operating conditions. On the other hand, total power or electricity consumption indicators only reflect absolute energy consumption levels without considering corresponding differences in water supply, making it difficult to establish a unified evaluation standard between high-flow and low-flow operating conditions. As shown in the relationship between pump power and flow rate, power is determined by pressure difference, flow rate, and efficiency, not solely by flow rate or energy consumption. Therefore, using power or efficiency alone as an evaluation criterion makes it difficult to accurately determine the economic advantages and disadvantages between different operating points.

[0005] In complex operating scenarios such as multiple pumps operating in parallel, variable frequency speed control, and dynamic load changes, the above problems become even more prominent. Existing methods usually require the use of experience-based point selection, efficiency peak judgment, or multi-objective optimization algorithms for decision support. However, such methods often rely on complex models or multi-parameter coupled analysis, lacking a unified evaluation metric that can directly reflect the energy consumption per unit of water supply. This makes it difficult to make intuitive comparisons of operating conditions under different equipment, different speeds, and different flow rates on the same scale.

[0006] In summary, while existing technologies can perform energy consumption analysis and scheduling optimization of water supply systems to a certain extent through performance curves and operational data, they still lack a technical means to establish a unified economic evaluation standard across different equipment types and operating conditions. In particular, they lack direct evaluation indicators that can simultaneously reflect the relationship between water supply and energy consumption, making it difficult to accurately determine whether a certain operating condition is the most economical operating point. This problem constitutes the core technical deficiency in the economic operation evaluation of water supply systems. Summary of the Invention

[0007] To address the problems existing in the prior art, this invention provides a method for evaluating the economic operating conditions of a water supply system by introducing a specific work parameter.

[0008] This invention is implemented as follows: a method for evaluating the economic operating conditions of a water supply system by introducing a specific power parameter, wherein the method for evaluating the economic operating conditions of a water supply system by introducing a specific power parameter includes:

[0009] By calculating the specific power at each flow point within the flow range of the pump unit, the flow-specific power curve of the unit is obtained. The economic operating conditions of the water supply system are then evaluated using the relationship between flow and specific power.

[0010] Furthermore, the method for evaluating the economic operating conditions of a water supply system by introducing a specific work parameter includes the following steps:

[0011] Step 1: Determine whether the water supply system's water supply unit is a centrifugal pump or a variable frequency unit; if the water supply system's water supply unit is a centrifugal pump, proceed to Step 2; if the water supply system's water supply unit is a variable frequency unit, proceed to Step 3.

[0012] Step 2: Calculate the specific work at each flow point within the flow range of the centrifugal pump set to obtain the flow-specific work curve of the centrifugal pump set. Based on the flow-specific work curve of the centrifugal pump set, obtain the equipment with the highest operating economy.

[0013] Step 3: Calculate the flow rate-specific power curve of the variable frequency unit based on its energy consumption curve and flow entropy diagram; and obtain the optimal operating point based on the flow rate-specific power curve of the variable frequency unit.

[0014] Furthermore, the equipment with the highest operating economic efficiency based on the flow-specific power curve of the centrifugal pump set includes:

[0015] Comparing the specific power of all equipment in a centrifugal pump unit, the equipment with the lowest specific power has the highest economic efficiency.

[0016] Furthermore, the energy consumption curve of the variable frequency unit is as follows:

[0017] ;

[0018] in, This represents the optimal energy consumption point.

[0019] Furthermore, the flow entropy diagram of the variable frequency unit is as follows:

[0020] ;

[0021] in, This indicates the specific work done at a given flow rate point. This represents the power at operating point i; This represents the flow rate at operating point i.

[0022] Furthermore, obtaining the optimal operating point based on the flow-specific power curve of the variable frequency unit includes:

[0023] By standardizing the ratio of the horizontal and vertical axes of the coordinate system, the flow-entropy diagram of the variable frequency unit and other constant speed flow-entropy diagrams are placed on a single graph for analysis and illustration, thus obtaining the optimal operating point.

[0024] Another object of the present invention is to provide a water supply system economic condition assessment system by introducing a specific power parameter, which implements the method for assessing the economic condition of a water supply system by introducing a specific power parameter. The water supply system economic condition assessment system by introducing a specific power parameter includes:

[0025] The water supply unit classification module is used to classify the water supply units of the water supply system into centrifugal pumps or variable frequency units.

[0026] The centrifugal pump economic operating condition evaluation module is used to calculate the specific power of each flow point within the flow range of the centrifugal pump group, obtain the flow-specific power curve of the centrifugal pump group, and obtain the equipment with the highest operating economy based on the flow-specific power curve of the centrifugal pump group.

[0027] The variable frequency unit economic operating condition assessment module is used to calculate the flow-specific power curve of the variable frequency unit based on the energy consumption curve and flow entropy diagram of the variable frequency unit; and to obtain the optimal operating point based on the flow-specific power curve of the variable frequency unit.

[0028] Another object of the present invention is to provide a computer device, the computer device including a memory and a processor, the memory storing a computer program, the computer program being executed by the processor, causing the processor to perform the following steps of the method for evaluating the economic operating conditions of a water supply system by introducing a specific power parameter:

[0029] Step 1: Determine whether the water supply system's water supply unit is a centrifugal pump or a variable frequency unit; if the water supply system's water supply unit is a centrifugal pump, proceed to Step 2; if the water supply system's water supply unit is a variable frequency unit, proceed to Step 3.

[0030] Step 2: Calculate the specific work at each flow point within the flow range of the centrifugal pump set to obtain the flow-specific work curve of the centrifugal pump set. Based on the flow-specific work curve of the centrifugal pump set, obtain the equipment with the highest operating economy.

[0031] Step 3: Calculate the flow rate-specific power curve of the variable frequency unit based on its energy consumption curve and flow entropy diagram; and obtain the optimal operating point based on the flow rate-specific power curve of the variable frequency unit.

[0032] Another object of the present invention is to provide a computer-readable storage medium storing a computer program, which, when executed by a processor, causes the processor to perform the following steps of the method for evaluating the economic operating conditions of a water supply system by introducing a specific power parameter:

[0033] Step 1: Determine whether the water supply system's water supply unit is a centrifugal pump or a variable frequency unit; if the water supply system's water supply unit is a centrifugal pump, proceed to Step 2; if the water supply system's water supply unit is a variable frequency unit, proceed to Step 3.

[0034] Step 2: Calculate the specific work at each flow point within the flow range of the centrifugal pump set to obtain the flow-specific work curve of the centrifugal pump set. Based on the flow-specific work curve of the centrifugal pump set, obtain the equipment with the highest operating economy.

[0035] Step 3: Calculate the flow rate-specific power curve of the variable frequency unit based on its energy consumption curve and flow entropy diagram; and obtain the optimal operating point based on the flow rate-specific power curve of the variable frequency unit.

[0036] Another objective of this invention is to provide an information data processing terminal for implementing the water supply system economic condition evaluation system by introducing specific power parameters.

[0037] Based on the above technical solutions and the technical problems solved, please analyze the advantages and positive effects of the technical solution to be protected by this invention from the following aspects:

[0038] First, addressing the technical problems existing in the prior art and the difficulty in solving them, this paper closely analyzes, in conjunction with the technical solution to be protected by this invention and the results and data obtained during the research and development process, how the technical solution of this invention solves the technical problems, and the inventive technical effects brought about by solving these problems. The specific description is as follows:

[0039] This invention can clearly identify where pump operation is economical, where shaft power is low but uneconomical, and where shaft power is high but economical relative to flow rate.

[0040] This invention introduces a specific power ratio, which allows for comparison among n pumps to determine which pump's point is the most economical and which range is the most economical.

[0041] Second, considering the technical solution as a whole or from a product perspective, the technical effects and advantages of the technical solution to be protected by this invention are specifically described as follows:

[0042] This invention utilizes specific power to evaluate the economic efficiency of a pump at each parameter point, enabling effective assessment of the economic operating conditions of a water supply system.

[0043] Third, as supplementary evidence of the inventive step of the claims of this invention, it is also reflected in the following important aspects:

[0044] (1) The expected benefits and commercial value of the technical solution of this invention after transformation are as follows:

[0045] (2) The technical solution of this invention fills a technical gap in the industry both domestically and internationally:

[0046] (3) Whether the technical solution of the present invention solves the technical problem that people have long wanted to solve but have never been able to solve successfully:

[0047] (4) Whether the technical solution of the present invention overcomes technical bias: Attached Figure Description

[0048] Figure 1 This is a flowchart of a method for evaluating the economic operating conditions of a water supply system by introducing a specific work parameter, provided in an embodiment of the present invention.

[0049] Figure 2 This is a flow-pressure, pump unit flow-power, and flow-specific power diagram of different pumps provided in the embodiments of the present invention;

[0050] Figure 3 This is a flow entropy-specific work curve diagram of the centrifugal pump equipment provided in the embodiments of the present invention;

[0051] Figure 4 This is an energy consumption curve diagram of the variable frequency unit provided in the embodiment of the present invention;

[0052] Figure 5 This is a flow-specific power curve diagram of the variable frequency unit provided in an embodiment of the present invention;

[0053] Figure 6 These are the flow-entropy diagrams of variable frequency units and other constant speed flow-entropy diagrams provided in the embodiments of the present invention. Detailed Implementation

[0054] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0055] The method for evaluating the economic operating conditions of a water supply system by introducing a specific power parameter provided in this embodiment of the invention includes: calculating the specific power of each flow point within the flow range of the pump unit to obtain the flow-specific power curve of the unit, and evaluating the economic operating conditions of the water supply system through the relationship between flow and specific power.

[0056] like Figure 1 As shown, the method for evaluating the economic operating conditions of a water supply system by introducing a specific work parameter, provided in this embodiment of the invention, includes the following steps:

[0057] S101, determine whether the water supply unit of the water supply system is a centrifugal pump or a variable frequency unit; if the water supply unit of the water supply system is a centrifugal pump, proceed to step S102; if the water supply unit of the water supply system is a variable frequency unit, proceed to step S103.

[0058] S102, calculate the specific work of each flow point within the flow range of the centrifugal pump set to obtain the flow-specific work curve of the centrifugal pump set, and obtain the equipment with the highest operating economy based on the flow-specific work curve of the centrifugal pump set.

[0059] S103, the flow-specific power curve of the variable frequency unit is calculated based on the energy consumption curve and flow entropy diagram of the variable frequency unit; the optimal operating point is obtained based on the flow-specific power curve of the variable frequency unit.

[0060] The equipment with the highest operating economy based on the flow-specific power curve of the centrifugal pump set provided in this embodiment of the invention includes:

[0061] Comparing the specific power of all equipment in a centrifugal pump unit, the equipment with the lowest specific power has the highest economic efficiency.

[0062] The energy consumption curve of the variable frequency unit provided in this embodiment of the invention is as follows:

[0063] ;

[0064] in, This represents the optimal energy consumption point.

[0065] The flow entropy diagram of the variable frequency unit provided in this embodiment of the invention is as follows:

[0066] ;

[0067] in, This indicates the specific work done at a given flow rate point. This represents the power at operating point i; This represents the flow rate at operating point i.

[0068] The optimal operating point obtained based on the flow-specific power curve of the variable frequency unit provided in this embodiment of the invention includes:

[0069] By standardizing the ratio of the horizontal and vertical axes of the coordinate system, the flow-entropy diagram of the variable frequency unit and other constant speed flow-entropy diagrams are placed on a single graph for analysis and illustration, thus obtaining the optimal operating point.

[0070] The economic operating condition evaluation system for water supply systems that introduces specific work parameters provided in this invention includes:

[0071] The water supply unit classification module is used to classify the water supply units of the water supply system into centrifugal pumps or variable frequency units.

[0072] The centrifugal pump economic operating condition evaluation module is used to calculate the specific power of each flow point within the flow range of the centrifugal pump group, obtain the flow-specific power curve of the centrifugal pump group, and obtain the equipment with the highest operating economy based on the flow-specific power curve of the centrifugal pump group.

[0073] The variable frequency unit economic operating condition assessment module is used to calculate the flow-specific power curve of the variable frequency unit based on the energy consumption curve and flow entropy diagram of the variable frequency unit; and to obtain the optimal operating point based on the flow-specific power curve of the variable frequency unit.

[0074] The technical solution of the present invention will be further described below with reference to specific embodiments.

[0075] Example 1:

[0076] 1. The concept of comparative work is defined as follows:

[0077] This refers to the average energy consumption per unit flow rate of a device at a certain operating point.

[0078] That is, in the energy consumption curve

[0079] Perform the following calculations.

[0080]

[0081] In the formula, This represents the specific work (kW / m³) at a certain flow rate point. 3 ); This represents the power (kW) at operating point i. This represents the flow rate (m) at operating point i. 3 / h).

[0082] 2. From a physical perspective, this can be understood as the degree of power consumption of the device due to flow rate. It is similar to the concept of heat transfer caused by temperature in thermodynamics.

[0083] 3. The calculation method for specific work and energy saving is the same, but the physical concepts are not entirely the same. Specific work is generally used to measure energy consumption and its effects.

[0084] 4. Specific power is a tool used to analyze all operating points of a pump and to compare parameters between different units, which already introduces the concept of parameters.

[0085] 5. Solutions

[0086] 5.1 This invention calculates the specific power at each flow point within the flow range of the pump unit to obtain the flow-specific power curve of the unit. Through the relationship between flow and specific power, it can be known where the pump operating point is economical, where the shaft power is small but not economical, and in some areas where the shaft power is large but economical relative to the flow.

[0087] 5.2 The power ratio can also be used to compare which point of n pumps is the most economical and which range is the most economical.

[0088] 5.3 Below are flow-pressure, pump unit flow-power, and flow-specific power graphs for two different pumps.

[0089] 5.4 By introducing specific work, a series of conclusions can be obtained, and these conclusions lead to the final optimized method of this invention.

[0090] 5.4.1 The flow-specific work curves of all centrifugal pumps tend to have similar shapes. The point with the minimum specific work (that is, the most economical point) is the point with the maximum flow. This is completely different from the efficiency curve of the pump.

[0091] 5.4.2 All centrifugal pump flow-specific power curves are monotonically decreasing functions.

[0092] 5.4.3 Evaluating the economic efficiency of a device operating at a certain parameter point relative to another point involves comparing its specific power at that point. The lower the specific power, the higher the economic efficiency of operation. For example... Figure 3 .

[0093] Depend on Figure 3 It can be seen that the operating points below the dashed line are more economical than those above the dashed line.

[0094] 5.5 Flow-specific power curves and formulas for variable frequency drives

[0095] 5.5.1 As previously introduced, the energy consumption curve of the variable frequency unit... Shape like Figure 4 .

[0096] 5.5.2 The mathematical expression for the flow entropy diagram is:

[0097]

[0098] Therefore Figure 4 Further calculations can yield the flow-specific power curve of the variable frequency unit.

[0099] 5.5.3 The flow-entropy diagram of a variable frequency drive unit is characterized by a "V" shape. That is, there must be a minimum point, and it opens upwards.

[0100] If the ratio of the horizontal and vertical axes of the coordinate system is standardized, the flow-entropy diagram of the variable frequency unit and other constant speed flow-entropy diagrams can be placed on the same graph for analysis and illustration, thus obtaining the optimal operating point.

[0101] An application embodiment of the present invention provides a computer device, the computer device including a memory and a processor, the memory storing a computer program, the computer program being executed by the processor causing the processor to perform the method of evaluating the economic operating conditions of a water supply system by introducing a specific power parameter.

[0102] An application embodiment of the present invention provides a computer-readable storage medium storing a computer program, which, when executed by a processor, causes the processor to perform the method for evaluating the economic operating conditions of a water supply system by introducing a specific power parameter.

[0103] An application embodiment of the present invention provides an information data processing terminal, which is used to implement the water supply system economic condition evaluation system by introducing specific power parameters.

[0104] To fully demonstrate that this solution can be implemented by those skilled in the art and that specific implementation methods provide stable support for its technical concept, six embodiments are described below. In Embodiment 1, for a single constant-speed centrifugal pump, input power and actual flow data are collected in advance at multiple flow points within the range from rated operating conditions to low flow conditions. The energy consumption value corresponding to a unit water delivery volume is calculated for each flow point, forming a curve showing the change between flow rate and specific power. Based on this, the low specific power range is identified as the economic operating range. This embodiment shows that by using specific power instead of simple head, efficiency, or shaft power indicators, the unit water supply cost can be directly reflected. In Embodiment 2, for two centrifugal pumps of different models but undertaking the same water supply task, flow-specific power curves are established separately under the same target flow rate. The specific power values ​​at the same flow point are compared laterally, and the pump with the lower specific power is selected for operation. This embodiment illustrates that this solution can not only evaluate the status of a single device but also provide a unified criterion for equipment selection and operation switching. In Example 3, for a combination of two centrifugal pumps operating in parallel, the total power and total flow rate of each combination under different flow distribution conditions are calculated, and the specific power curve of the combined operation is further obtained. Based on this, the optimal combination method is determined under medium-to-high flow demand conditions. This example illustrates that this solution can be extended to multi-device collaborative scenarios, demonstrating the consistency of the mechanism from single-machine evaluation to system-level evaluation. In Example 4, for a variable frequency water supply unit, power and flow rate data are collected at multiple speeds, multiple flow-to-power curves are constructed, and they are compared in a unified coordinate system. The operating point that meets the target flow rate and has the lowest specific power is selected as the operating point. This example demonstrates that this solution can transform variable frequency speed regulation behavior into a directly comparable economic graph. In Example 5, for a building secondary water supply system with significant day-night load fluctuations, real-time monitoring data is called according to three typical time periods: low peak, flat peak, and peak, and the flow-to-power curve is dynamically updated to automatically recommend operating equipment or operating speed for different time periods. This example illustrates that this solution has online evaluation capabilities and can adapt to changes in actual operating conditions. In Example 6, an evaluation system was constructed that includes data acquisition, unit identification, specific power calculation, curve generation, and operating condition output. Economic operating condition analysis was performed on centrifugal pump units and variable frequency units in an actual water supply station, outputting the economic operating section, optimal operating point, and corresponding energy consumption results. This example demonstrates that the aforementioned method can be implemented as a complete system process. The above six examples cover multiple levels, including single-unit operation, heterogeneous equipment comparison, multi-unit combination, variable frequency regulation, dynamic scheduling, and system implementation. They clearly reveal the technical route of using specific power as the core evaluation metric across different water supply scenarios, providing repeatable data acquisition methods, calculation logic, and judgment criteria, and demonstrating a substantial improvement over traditional methods that only consider peak efficiency or empirical pump selection.

[0105] It should be noted that embodiments of the present invention can be implemented in hardware, software, or a combination of both. The hardware portion can be implemented using dedicated logic; the software portion can be stored in memory and executed by a suitable instruction execution system, such as a microprocessor or dedicated-design hardware. Those skilled in the art will understand that the above-described devices and methods can be implemented using computer-executable instructions and / or included in processor control code, for example, such code provided on a carrier medium such as a disk, CD, or DVD-ROM, a programmable memory such as read-only memory (firmware), or a data carrier such as an optical or electronic signal carrier. The devices and modules of the present invention can be implemented by hardware circuitry such as very large-scale integrated circuits or gate arrays, semiconductors such as logic chips, transistors, or programmable hardware devices such as field-programmable gate arrays, programmable logic devices, etc., or by software executed by various types of processors, or by a combination of the above-described hardware circuitry and software, such as firmware.

[0106] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any modifications, equivalent substitutions, and improvements made by those skilled in the art within the scope of the technology disclosed in the present invention, and within the spirit and principles of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A method for evaluating the economic operating conditions of a centrifugal pump water supply system based on specific power, characterized in that, Includes the following steps: Acquire power and flow data for multiple flow points within the flow range of the centrifugal pump set; For each flow point, the specific power is calculated based on the ratio of the power corresponding to that flow point to the flow rate corresponding to that flow point. Construct the flow-to-specific-work curve of the centrifugal pump set based on the specific work at each flow point; Based on the flow-to-power curve, determine the economic operating conditions of the centrifugal pump set in different flow ranges, and accordingly determine the equipment or equipment combination with the highest operating economy.

2. The method as described in claim 1, characterized in that, The acquisition of power data and flow data corresponding to multiple flow points within the flow range of the centrifugal pump set includes: By calling up centrifugal pump set performance test data, design parameter data, or operation monitoring data, the input power and actual flow rate corresponding to multiple flow points can be extracted.

3. The method as described in claim 1, characterized in that, The construction of the flow-to-specific-power curve of the centrifugal pump set based on the specific power at each flow point includes: The flow rate value at each flow point is used as the horizontal axis, and the corresponding specific power value is used as the vertical axis to form a flow rate-specific power relationship curve that characterizes the energy consumption level of the centrifugal pump set.

4. The method as described in claim 1, characterized in that, The process of determining the economic operating conditions of the centrifugal pump set within different flow ranges based on the flow-to-power ratio curve, and accordingly determining the equipment or equipment combination with the highest operating economic efficiency, includes: By comparing the specific power values ​​of different devices or combinations of different devices at the same flow point, the device with the smallest specific power value is determined as the preferred operating device or combination of preferred operating devices at the corresponding flow point, and the operating section with the lowest specific power value is determined as the economic operating section.

5. A method for evaluating the economic operating conditions of a variable frequency water supply unit based on specific power, characterized in that, Includes the following steps: Acquire power and flow data of variable frequency water supply units under multiple speed conditions; For multiple flow points under each speed condition, the specific power is calculated according to the ratio of the power corresponding to that flow point to the flow rate corresponding to that flow point. A family of flow-specific power curves for variable frequency water supply units is constructed based on the specific power at each flow point under multiple speed conditions. A unified coordinate analysis is performed on the family of flow-to-power curves to determine the operating point with the minimum power under the target flow demand, and this operating point is determined as the optimal operating point.

6. The method as described in claim 5, characterized in that, The family of flow-to-specific-power curves for the variable frequency water supply unit, constructed based on the specific power at various flow points under multiple speed conditions, includes: Based on the energy consumption variation and flow distribution under each speed condition, flow-to-work ratio curves are generated for the corresponding speed conditions, and the flow-to-work ratio curves under multiple speed conditions are aggregated to form the flow-to-work ratio curve family.

7. The method as described in claim 5, characterized in that, The step of performing unified coordinate analysis on the family of flow-to-power curves to determine the operating point with the minimum power ratio under the target flow demand includes: Unify the horizontal and vertical scales of the analysis graphs under different speed conditions, compare the specific work of the flow points corresponding to different speed conditions in the same coordinate system, and select the flow point and speed point that meet the target flow requirements and have the smallest specific work as the optimal operating point.

8. An economic operating condition evaluation system for a water supply system based on specific work, characterized in that, include: The data acquisition module is used to collect power and flow data of the water supply unit at multiple operating points; The unit identification module is used to identify whether the water supply unit is a centrifugal pump unit or a variable frequency water supply unit. The specific work calculation module is used to calculate the specific work at each operating point based on the ratio of power to flow rate. The curve construction module is used to construct flow-specific power curves or a family of flow-specific power curves based on the specific power at each operating point. The operating condition determination module is used to determine the economic operating conditions of the water supply system based on the flow-to-power curve or the family of flow-to-power curves, and output the preferred equipment, preferred equipment combination or optimal operating point.

9. The system as described in claim 8, characterized in that, The operating condition determination module includes a centrifugal pump evaluation unit and a variable frequency unit evaluation unit; The centrifugal pump evaluation unit is used to compare the flow rate-to-power curves of different centrifugal pump devices or different combinations of centrifugal pumps, and output the device or combination of devices with the lowest power-to-power ratio. The variable frequency unit evaluation unit is used to compare a family of flow-to-power curves under multiple speed conditions and output the optimal operating point under the target flow requirement.

10. The system as described in claim 8, characterized in that, The system further includes a result output module, which is used to output at least one of the following: Economic operating segment; Preferred operating equipment; Optimal combination of operating equipment; Optimal operating speed; Optimal operating flow point; The specific work value at the corresponding operating point.

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