CN117332957A - Variable pump energy-saving effect calculation method - Google Patents

Variable pump energy-saving effect calculation method Download PDF

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Publication number
CN117332957A
CN117332957A CN202311260141.2A CN202311260141A CN117332957A CN 117332957 A CN117332957 A CN 117332957A CN 202311260141 A CN202311260141 A CN 202311260141A CN 117332957 A CN117332957 A CN 117332957A
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CN
China
Prior art keywords
average
calculating
pump
efficiency
water supply
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CN202311260141.2A
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Chinese (zh)
Inventor
牛清泉
邓晓湖
刘贵友
宋顺
吴敏儒
易凯江
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Hunan M&w Energy Saving Technology&science Co ltd
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Hunan M&w Energy Saving Technology&science Co ltd
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Priority to CN202311260141.2A priority Critical patent/CN117332957A/en
Publication of CN117332957A publication Critical patent/CN117332957A/en
Pending legal-status Critical Current

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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06Q—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES; SYSTEMS OR METHODS SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES, NOT OTHERWISE PROVIDED FOR
    • G06Q10/00—Administration; Management
    • G06Q10/06—Resources, workflows, human or project management; Enterprise or organisation planning; Enterprise or organisation modelling
    • G06Q10/063—Operations research, analysis or management
    • G06Q10/0631—Resource planning, allocation, distributing or scheduling for enterprises or organisations
    • G06Q10/06315—Needs-based resource requirements planning or analysis
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C11/00—Combinations of two or more machines or pumps, each being of rotary-piston or oscillating-piston type; Pumping installations
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C14/00—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06Q—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES; SYSTEMS OR METHODS SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES, NOT OTHERWISE PROVIDED FOR
    • G06Q50/00—Systems or methods specially adapted for specific business sectors, e.g. utilities or tourism
    • G06Q50/06—Electricity, gas or water supply

Abstract

The application discloses a variable pump energy-saving effect calculation method, which comprises the steps of calculating average power before transformation; calculating the average hour required water supply; calculating an average lift; determining the running average efficiency of the water pump and the running efficiency of the motor; calculating the average power of the modified variable pump by utilizing the average hour required water supply quantity, the average lift, the running average efficiency of the water pump and the running efficiency of the motor; and calculating the hour power saving quantity by using the average power before transformation and the average power after transformation of the variable pump. The energy-saving effect calculating method of the variable pump can calculate the energy-saving effect caused by automatic adjustment of the variable pump more accurately.

Description

Variable pump energy-saving effect calculation method
Technical Field
The invention belongs to the technical field of water circulation systems, and particularly relates to a variable pump energy-saving effect calculation method.
Background
The variable pump is an efficient energy-saving water pump which can achieve online flow adjustment by adjusting the opening of the blade, compared with a conventional water pump, the variable pump can be adjusted online according to actual demands, so that a better energy-saving effect can be achieved, compared with a traditional variable frequency adjustment mode, the energy consumption of the variable pump is lower, the input equipment cost and the construction cost are far lower than those of a frequency converter, and the variable pump is more popular, and in the use process, a user and a producer know that the variable pump has the energy-saving effect, but cannot calculate the energy-saving effect brought by the variable pump very accurately.
The calculation of the energy-saving effect of the existing circulating water system is based on stable working conditions, namely, under a certain fixed working condition, the running power of the equipment before and after the change is calculated respectively, and the difference value is taken as the energy-saving effect, and the method specifically comprises the following steps:
power before changing: p (P) Front part ＝1.732UIcosφ；
Wherein U is voltage, I is current, cos phi is power factor;
power after change: p (P) Rear part (S) ＝ρgQH/η Pump with a pump body /η Electric power ；
Wherein ρ is density, g is gravitational acceleration, Q is flow, H is lift, η Pump with a pump body Is the water pump efficiency, i.e. the ratio of the effective power of the water pump to the shaft power, where the shaft power is the power delivered by the motor to the water pump shaft, eta Electric power The motor efficiency, i.e. the ratio of the motor output power to the motor input power, is the active power of the system, and the motor output power is the shaft power of the water pump in the pump group.
In the data, U, I, cos phi, rho, g and Q are all actual operation values of the site, H is calculated according to the inlet and outlet pressures of the site, eta Pump with a pump body And eta Electric power To change the design value.
The power saving amount per hour can be calculated according to the power before and after the change:
power saving per hour=p Front part -P Rear part (S) 。
Therefore, the existing calculation method of the energy-saving effect mainly aims at a constant working condition, and if the system has self-adjusting capability, such as a variable pump is installed, and the system can be automatically adjusted according to the temperature of water supply, the existing calculation method of the energy-saving effect of the circulating water system cannot show the energy-saving effect of the variable pump.
Disclosure of Invention
In order to solve the problems, the invention provides a variable pump energy-saving effect calculating method which can more accurately calculate the energy-saving effect caused by automatic adjustment of a variable pump.
The invention provides a variable pump energy-saving effect calculation method which comprises the following steps:
calculating the average power before transformation;
calculating the average hour required water supply;
calculating an average lift;
determining the running average efficiency of the water pump and the running efficiency of the motor;
calculating the average power of the modified variable pump by utilizing the average hour required water supply quantity, the average lift, the running average efficiency of the water pump and the running efficiency of the motor;
and calculating the hour power saving quantity by using the average power before transformation and the average power after transformation of the variable pump.
Preferably, in the above variable displacement pump energy saving effect calculation method, the calculating the average hour required water supply amount includes:
determining the highest temperature difference t of the water supply and return for one month High height Corresponding system flow Q at this time High height ；
Calculating the average water supply and return temperature difference t Flat plate ，t Flat plate An arithmetic average of all recorded temperature differences over a month;
the flow rate Q required for average per hour is calculated according to the flow rate of 10 percent corresponding to the temperature difference of 1 DEG C Flat plate ：
Q Flat plate ＝[1-10％*(t High height -t Flat plate )]*Q High height 。
Preferably, in the above method for calculating energy saving effect of a variable displacement pump, the calculating the average lift includes:
acquiring main pipe water supply pressure P of water supply system under maximum flow Feed device And return water pressure P Returning to ；
Utilization system pipe loss= (P Feed device -P Returning to )/ρg＝kQ High height 2 Calculating the value of k;
ρ is the density of the conveying medium, g is the gravitational acceleration, and k is the coefficient of resistance of the water supply system pipeline;
calculating the pressure difference P of water supply and return under the average flow Difference of difference ＝kQ Flat plate 2 ρg；
Calculating an average water supply pressure P Is required to ＝P Returning to +(P Difference of difference +P Feed device -P Returning to )/2；
Calculating pipe loss H in pump room Pump house loss ＝ξv 2 2g, xi is the local resistance loss coefficient, v is the flow velocity of liquid in a valve or an elbow, g is the gravitational acceleration;
calculate the exit velocity head H Quick speed ＝v 2 2g, wherein the outlet flow velocity v=q Flat plate /S，S＝πD 2 4, D is the diameter of the main pipe;
calculating the average lift h=z of the water pump 1 +H Quick speed +H Pump house loss +P Is required to /ρg；
Wherein z of the feed water level 1 The height of the water inlet liquid level relative to the total pipe pressure gauge.
Preferably, in the above variable pump energy saving effect calculating method, the determining the running average efficiency of the water pump includes:
and reducing the highest efficiency point of the water pump by 2 points to obtain the running average efficiency of the water pump.
Preferably, in the above variable pump energy saving effect calculating method, the determining the motor operation efficiency includes:
subtracting the two percentage points from the motor nameplate efficiency to obtain the motor operation efficiency.
Preferably, in the above method for calculating energy saving effect of a variable pump, the average power after modification of the variable pump is calculated using the following formula:
P rear part (S) ＝ρgQ Flat plate H/η Pump with a pump body /η Electric power ；
Wherein ρ is the density of the conveying medium, g is the gravitational acceleration, Q Flat plate For the average hour required water supply, H is the average lift, eta Pump with a pump body For the average efficiency, eta, of the water pump operation Electric power For the motor operating efficiency.
Preferably, in the above method for calculating an energy saving effect of a variable pump, the calculating the hour power saving amount by using the average power before modification and the average power after modification of the variable pump includes:
hour power saving P Node ＝P Front part -P Rear part (S) 。
Preferably, in the above method for calculating energy saving effect of a variable displacement pump, the calculating the average power before modification includes:
using formula P Front part ＝(Q 2 -Q 1 )/(T 2 -T 1 ) Calculating the average power before modification, wherein Q 1 To display the initial electric energy of the kilowatt-hour meter before modification, Q 2 For the display number of the electric energy of the kilowatt-hour meter after the preset operation time before modification, T 1 For initial display number of accumulator, T 2 Is the number of displays of the accumulator after a preset run time.
As can be seen from the above description, the method for calculating the energy-saving effect of the variable pump provided by the invention comprises the steps of calculating the average power before transformation; calculating the average hour required water supply; calculating an average lift; determining the running average efficiency of the water pump and the running efficiency of the motor; calculating the average power of the modified variable pump by utilizing the average hour required water supply quantity, the average lift, the running average efficiency of the water pump and the running efficiency of the motor; the average power before transformation and the average power after transformation of the variable pump are used for calculating the hour power saving quantity, so that the energy saving effect caused by automatic adjustment of the variable pump can be calculated more accurately.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only embodiments of the present invention, and that other drawings can be obtained according to the provided drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic diagram of an embodiment of a variable pump energy-saving effect calculating method provided by the invention.
Detailed Description
The core of the invention is to provide a variable pump energy-saving effect calculation method which can calculate the energy-saving effect caused by automatic adjustment of the variable pump more accurately.
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
An embodiment of a variable pump energy-saving effect calculation method provided by the invention is shown in fig. 1, and fig. 1 is a schematic diagram of an embodiment of a variable pump energy-saving effect calculation method provided by the invention, and the method may include the following steps:
s1: calculating the average power before transformation;
specifically, calculating the average power before modification may specifically include: using formula P Front part ＝(Q 2 -Q 1 )/(T 2 -T 1 ) Calculating the average power before modification, wherein Q 1 To display the initial electric energy of the kilowatt-hour meter before modification, Q 2 For the display number of the electric energy of the kilowatt-hour meter after the preset operation time before modification, T 1 For initial display number of accumulator, T 2 Is the number of displays of the accumulator after a preset run time. In the course of the operation of the device,the electric meter and the timer can be installed first, and then the display data Q of the electric meter and the timer of each device are counted for the first time on site 1 And T 1 After the original equipment continuously operates for a preset operation time such as 72 hours, the electric energy meter and the accumulator display data Q of each equipment are counted for the second time 2 And T 2 The average power before modification can be calculated.
S2: calculating the average hour required water supply;
specifically, the maximum allowable water supply and return temperature difference can be determined according to the field condition and the requirement of a user, the water supply and return temperature difference is generally 6-8 ℃, the specific set value is determined according to the requirement of the user, and further, the calculation of the water supply amount required by the average hour can comprise determining the water supply and return temperature difference t with the highest water supply and return temperature difference for one month High height Corresponding system flow Q at this time High height The method comprises the steps of carrying out a first treatment on the surface of the Calculating the average water supply and return temperature difference t Flat plate ，t Flat plate An arithmetic average of all recorded temperature differences over a month; the flow rate Q required for average per hour is calculated according to the flow rate of 10 percent corresponding to the temperature difference of 1 DEG C Flat plate ：Q Flat plate ＝[1-10％*(t High height -t Flat plate )]*Q High height 。
S3: calculating an average lift;
specifically, calculating the average lift may include the following steps:
acquiring main pipe water supply pressure P of water supply system under maximum flow Feed device And return water pressure P Returning to ；
According to the pressure difference of the water supply and return, the pressure difference of the water supply and return under the average flow is calculated, and the pressure loss of the water supply and return is used for overcoming the resistance loss of the pipeline, so that the system pipeline loss= (P) Feed device -P Returning to )/ρg＝kQ High height 2 Calculating the value of k;
ρ is the density of the conveying medium, g is the gravitational acceleration, and k is the coefficient of resistance of the water supply system pipeline;
substituting the average flow into a formula to calculate the pressure difference P of the water supply and return under the average flow Difference of difference ＝kQ Flat plate 2 ρg；
Calculating an average water supply pressure P Is required to ＝P Returning to +(P Difference of difference +P Feed device -P Returning to ) 2, namely the average value of the pressure difference under the average flow and the pressure difference under the maximum flow, adding the backwater pressure as the average water supply pressure;
calculating pipe loss H in pump room Pump house loss ＝ξv 2 2g, xi is the local resistance loss coefficient, v is the flow velocity of liquid in a valve or an elbow, g is the gravitational acceleration;
calculate the exit velocity head H Quick speed ＝v 2 2g, wherein the outlet flow velocity v=q Flat plate /S，S＝πD 2 4, D is the diameter of the main pipe;
calculating the average lift h=z of the water pump 1 +H Quick speed +H Pump house loss +P Is required to Calculating the average lift of the water pump according to the average water supply main pressure and the water inlet liquid level, the pipe loss estimation in the pump room and the speed head of the outlet;
wherein z of the feed water level 1 To the height of the water inlet liquid level relative to the total pipe pressure gauge, the pump house inner pipe is damaged H Damage to The calculation can be performed according to the number of elbows and valves on the pipeline in the pump room.
S4: determining the running average efficiency of the water pump and the running efficiency of the motor;
specifically, according to the maximum flow and the maximum lift, determining parameters of the high-efficiency point in the average flow and the average lift according to the water pump performance curve, determining the running average efficiency of the water pump may include: the highest effective point of the water pump is reduced by 2 points to be used as the running average efficiency eta of the water pump Pump with a pump body The specific efficiency value can be adjusted according to the performance curve, and the highest efficiency is taken as the average operation efficiency by-2% because the operation condition of the water pump is a range, wherein the highest efficiency point can be shown on the performance curve of the water pump.
Determining motor operating efficiency may include: subtracting two percentage points from the motor nameplate efficiency yields the motor operating efficiency, which is the same principle as the water pump efficiency described above.
S5: calculating the average power of the modified variable pump by utilizing the average water supply quantity required by the average hour, the average lift, the running average efficiency of the water pump and the running efficiency of the motor;
specifically, the average power of the modified variable displacement pump can be calculated by using the following formula:
P rear part (S) ＝ρgQ Flat plate H/η Pump with a pump body /η Electric power ；
Wherein ρ is the density of the conveying medium, g is the gravitational acceleration, Q Flat plate For the average hour of water supply, H is the average lift, eta Pump with a pump body For the running average efficiency of the water pump, eta Electric power The motor operation efficiency is achieved.
S6: and calculating the hour power saving quantity by using the average power before transformation and the average power after transformation of the variable pump.
Specifically, calculating the hour power saving amount using the average power before modification and the average power after modification of the variable displacement pump may include: hour power saving P Node ＝P Front part -P Rear part (S) 。
As can be seen from the above description, in the embodiment of the method for calculating the energy-saving effect of the variable pump provided by the invention, the average power before transformation is calculated; calculating the average hour required water supply; calculating an average lift; determining the running average efficiency of the water pump and the running efficiency of the motor; calculating the average power of the modified variable pump by utilizing the average water supply quantity required by the average hour, the average lift, the running average efficiency of the water pump and the running efficiency of the motor; the average power before transformation and the average power after transformation of the variable pump are used for calculating the hour power saving quantity, so that the energy saving effect caused by automatic adjustment of the variable pump can be more accurately calculated.
In summary, by adopting the variable pump energy-saving effect calculation method, the working condition after improvement by using the variable pump is a variable working condition, the method calculates the average value of the flow, the lift and the efficiency, and the selection and the determination of the average value can calculate the energy-saving effect after improvement by using the variable pump more accurately.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (8)

1. The energy-saving effect calculation method of the variable pump is characterized by comprising the following steps of:
calculating the average power before transformation;
calculating the average hour required water supply;
calculating an average lift;
determining the running average efficiency of the water pump and the running efficiency of the motor;
calculating the average power of the modified variable pump by utilizing the average hour required water supply quantity, the average lift, the running average efficiency of the water pump and the running efficiency of the motor;
and calculating the hour power saving quantity by using the average power before transformation and the average power after transformation of the variable pump.
2. The variable pump energy saving effect calculating method according to claim 1, wherein the calculating the average hour required water supply amount includes:
determining the highest temperature difference t of the water supply and return for one month High height Corresponding system flow Q at this time High height ；
Calculating the average water supply and return temperature difference t Flat plate ，t Flat plate An arithmetic average of all recorded temperature differences over a month;
the flow rate Q required for average per hour is calculated according to the flow rate of 10 percent corresponding to the temperature difference of 1 DEG C Flat plate ：
Q Flat plate ＝[1-10％*(t High height -t Flat plate )]*Q High height 。
3. The variable displacement pump energy saving effect calculation method according to claim 2, wherein calculating the average head comprises:
acquiring main pipe water supply pressure P of water supply system under maximum flow Feed device And return water pressure P Returning to ；
Utilization system pipe loss= (P Feed device -P Returning to )/ρg＝kQ High height 2 Calculating the value of k;
ρ is the density of the conveying medium, g is the gravitational acceleration, and k is the coefficient of resistance of the water supply system pipeline;
calculating the pressure difference P of water supply and return under the average flow Difference of difference ＝kQ Flat plate 2 ρg；
Calculating an average water supply pressure P Is required to ＝P Returning to +(P Difference of difference +P Feed device -P Returning to )/2；
Calculating pipe loss H in pump room Pump house loss ＝ξv 2 2g, xi is the local resistance loss coefficient, v is the flow velocity of liquid in a valve or an elbow, g is the gravitational acceleration;
calculate the exit velocity head H Quick speed ＝v 2 2g, wherein the outlet flow velocity v=q Flat plate /S，S＝πD 2 4, D is the diameter of the main pipe;
calculating the average lift h=z of the water pump 1 +H Quick speed +H Pump house loss +P Is required to /ρg；
Wherein z of the feed water level 1 The height of the water inlet liquid level relative to the total pipe pressure gauge.
4. The variable pump energy saving effect calculation method according to claim 3, wherein the determining the water pump running average efficiency includes:
and reducing the highest efficiency point of the water pump by 2 points to obtain the running average efficiency of the water pump.
5. The variable displacement pump energy saving effect calculation method according to claim 4, wherein the determining the motor operation efficiency includes:
subtracting the two percentage points from the motor nameplate efficiency to obtain the motor operation efficiency.
6. The variable pump energy saving effect calculation method according to claim 5, wherein the average power after modification of the variable pump is calculated using the following formula:
P rear part (S) ＝ρgQ Flat plate H/η Pump with a pump body /η Electric power ；
Wherein ρ is the density of the conveying medium, g is the gravitational acceleration, Q Flat plate For the average hour required water supply, H is the average lift, eta Pump with a pump body For the average efficiency, eta, of the water pump operation Electric power For the motor operating efficiency.
7. The variable pump energy saving effect calculation method according to claim 6, wherein the calculating an hour power saving amount using the average power before modification and the average power after modification of the variable pump includes:
hour power saving P Node ＝P Front part -P Rear part (S) 。
8. The variable displacement pump energy saving effect calculation method according to claim 7, wherein the calculating the average power before modification includes:
using formula P Front part ＝(Q 2 -Q 1 )/(T 2 -T 1 ) Calculating the average power before modification, wherein Q 1 To display the initial electric energy of the kilowatt-hour meter before modification, Q 2 For the display number of the electric energy of the kilowatt-hour meter after the preset operation time before modification, T 1 For initial display number of accumulator, T 2 Is the number of displays of the accumulator after a preset run time.
CN202311260141.2A 2023-09-26 2023-09-26 Variable pump energy-saving effect calculation method Pending CN117332957A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202311260141.2A CN117332957A (en) 2023-09-26 2023-09-26 Variable pump energy-saving effect calculation method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202311260141.2A CN117332957A (en) 2023-09-26 2023-09-26 Variable pump energy-saving effect calculation method

Publications (1)

Publication Number Publication Date
CN117332957A true CN117332957A (en) 2024-01-02

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ID=89276582

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202311260141.2A Pending CN117332957A (en) 2023-09-26 2023-09-26 Variable pump energy-saving effect calculation method

Country Status (1)

Country Link
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