CN113628061B - Water supply method for volume-variable water tank based on actual reserve water volume - Google Patents
Water supply method for volume-variable water tank based on actual reserve water volume Download PDFInfo
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Abstract
The invention discloses a water supply method for a volume-variable water tank based on actual reserve water volume, which comprises the following steps: 1. setting a water tank with two effective volumes, and selecting one of the effective volumes as the effective volume of the water tank currently in use; 2. calculating theoretical outlet flow of different time periods of a day, and calculating theoretical reserved water quantity of the current effective volume of the water tank at the starting time of the different time periods of the day according to the theoretical outlet flow meter under the condition of given residence time; 3. calculating the actual reserved water quantity of the current effective volume of the water tank, and calculating the inlet flow of the water tank in different time periods of the day according to the theoretical outlet flow, the theoretical reserved water quantity and the actual reserved water quantity; 4. finishing one-day water supply according to the result of the step three; 5. and calculating the volume ratio of the water tank, and changing the effective volume of the water tank when the volume ratio is smaller than or equal to a set value. The invention fully considers the situation that the water tank is provided with a ball gap, and can quantitatively control the residence time of tap water based on the actual water retention quantity.
Description
Technical Field
The invention relates to the field of secondary water supply of urban water supply network systems, in particular to a water supply method for a variable-volume water tank based on actual reserve water quantity.
Background
At present, most of the disinfection of urban drinking water (commonly called tap water) in China adopts a chlorine disinfection method. The chlorine disinfection method has the outstanding advantages that residual chlorine has a continuous disinfection effect, and the residual chlorine refers to the residual chlorine amount in water after chlorine is added to contact for a certain time during chlorine disinfection. The residual chlorine concentration in the urban water supply network system can be gradually attenuated along with the time, and the sufficient residual chlorine concentration in the urban water supply network system can ensure that microorganisms in tap water are controlled within a qualified range.
The secondary water supply is a water supply mode that users or users are supplied by pipelines through facilities such as storage, pressurization and the like when the requirements of domestic and industrial building drinking water on water pressure and water quantity exceed the capacity of a water supply network of urban public water supply or self-built facilities. The secondary water supply facility mainly comprises a water storage device, a pressurizing device and a pipeline. Tap water can stay for a period of time in secondary water supply and storage equipment (hereinafter referred to as a water tank), if the stay time is too long, the residual chlorine concentration can be attenuated to a very low level, so that the effect of effectively killing microorganisms in water can not be achieved, and the microorganism index of the tap water in the water tank exceeds the standard. Therefore, it is of great importance to minimize the residence time of tap water in the tank.
The water tank is used in three ways, the first of which is: the water tank is installed on the roof or middle floor of the high-rise building, and tap water in the urban water supply pipeline system is pumped to the water tank on the roof or middle floor through water in the pump house and then naturally flows to the user's home. Second kind: the water tank is installed in the pump house, and tap water in the urban water supply network system flows into the water tank in the pump house at first, and then is directly pressurized and conveyed to the high-rise user home through the variable-frequency water pump. Third kind: the water tanks are arranged at two places, one place is arranged in a pump house, the other place is arranged on the roof or the middle floor of a high-rise building, tap water in the urban water supply network system firstly flows into the water tank in the pump house, then the tap water is pumped into the water tank on the roof or the middle floor through the water in the pump house, and then naturally flows into the user's home. Such a tank is also called a high-level tank, which is installed on the roof or middle floor of a high-rise building, and such a tank is also called a low-level tank, which is installed in a pump room.
To ensure adequate water usage by the user, the volume of the tank in the building is designed based on the amount of water used after the user is fully admitted to the building, however, it is progressive for a newly built building to be admitted to the building, typically taking many years from the start of the occupancy to the full occupancy. Especially in the early stage of the user entering process, as the entering users are few, the volume of the water tank is overlarge relative to the water consumption of the entering users, so that the residence time of tap water in the water tank is extremely long, and the microbial index of the tap water in the water tank exceeds the standard.
The inlet flow of the new building water tank (hereinafter referred to as inlet flow) refers to the flow of tap water at a certain moment at the inlet of the new building water tank, the outlet flow of the new building water tank (hereinafter referred to as outlet flow) refers to the flow of tap water at a certain moment at the outlet of the new building water tank, the reserve water volume of the new building water tank (hereinafter referred to as reserve water volume) refers to the total volume of tap water at a certain moment in the new building water tank, and the reserve water volume and the outlet flow determine the residence time of tap water in the new building water tank. At present, the control of the water retention quantity is realized through a water level control valve in a newly built building water tank, when the water level in the newly built building water tank drops beyond a preset value, the water level control valve is opened and starts to supply water, when the water level rises to a preset height, the water level control valve is closed and stops supplying water, the control method does not completely consider the problem of the residence time of tap water in the newly built building water tank, and particularly for the newly built building with low occupancy rate, the phenomenon that the residence time of tap water in the newly built building water tank is too long is particularly serious. To date, no one has considered the quantitative relationship between the water retention amount and the residence time of tap water in the new building water tank from the quantitative point of view, and therefore cannot calculate the water retention amount quantitatively according to the given residence time, that is, cannot calculate the water supply amount to the new building water tank quantitatively according to the given residence time, and as a result, cannot control the residence time of tap water in the new building water tank quantitatively.
In order to solve the technical problems, publication No. CN110258722a discloses a water supply method of a volume-variable secondary water supply and storage device in 2019, 9 and 20 days, and the technical scheme includes the following steps: (1) providing a water storage device having a plurality of active volumes; (2) Calculating the average value of theoretical outlet flow in different time periods of a day and total water flowing out in a day, and then calculating the theoretical water retention quantity of the water storage equipment at the starting moment of different time periods of the day; (3) Calculating inlet flow of the water storage equipment in different time periods of a day; (4) The water supply control device supplies water to the water storage device according to the result of the step three; (5) And calculating the volume ratio of the water storage equipment, and determining whether the effective volume of the water storage equipment needs to be changed. The method solves the problem of quantitative control of the residence time of tap water in the newly-built building water storage equipment, and reduces the risk of exceeding the standard of microorganism fingers caused by overlong residence time of tap water in the newly-built building water storage equipment.
However, in the above-mentioned document, the reserve water amount obtained by the real-time detection in the third step is calculated by multiplying the measured water level height of the water tank by the longitudinal sectional area of the water tank. The longitudinal section of the tank means a section obtained by cutting off the tank with a plane parallel to the length and width of the tank, and the cross section of the tank means a section obtained by cutting off the tank with a plane parallel to the height and width of the tank. Most of the currently used water tanks are stainless steel water tanks, which are usually formed by welding a plurality of square stainless steel plates with equal size on site, and in order to increase strength and prevent deformation, almost all the square stainless steel plates on the side surfaces and the top surface of the stainless steel water tanks are punched into outwards protruding shapes, which are called as spherical defects in mathematics. As in the prior art with publication number CN203256059U, it is disclosed in 2013, 10 and 30 that the side wall of the water tank is formed by assembling and welding a plurality of punched stainless steel plates with different thicknesses. Generally, the stainless steel tank is two-layered at most, and also has a single layer and multiple layers, but each layer has a similar structure and contains the same number of balls. The strength of the water tank can be effectively increased through the spherical segment, but at present, when the water tank water retention amount is detected and calculated, the water tank water level height is directly multiplied by the water tank longitudinal sectional area without the spherical segment, the water amount corresponding to the spherical segment part is not considered, so that the calculated water retention amount usually has about 5% error, and the accurate control of water supply of the water tank is not facilitated.
Disclosure of Invention
The invention aims to overcome the problems in the prior art and provide a water supply method for a water tank with variable volume based on the actual water retention amount, which can quantitatively control the residence time of tap water in a newly built building water tank based on the actual water retention amount in the water tank, furthest reduce the risk of exceeding the standard of microorganism index caused by overlong residence time of tap water in a newly built building water tank, and has convenient implementation and low energy consumption, maintenance cost and running cost in actual running.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
a method of supplying water to a variable volume tank based on an actual reserve volume, comprising the steps of:
step one, setting a water tank with two effective volumes, and selecting one of the effective volumes as the effective volume currently used by the water tank;
detecting the outlet flow of the current effective volume of the water tank in different time periods of one day continuously for a plurality of days through an outlet flow meter, firstly calculating the average value of the theoretical outlet flow in different time periods of one day and the total water flowing out in one day by a control system according to the outlet flow meter obtained through detection after the detection is finished, and then calculating the theoretical water retention quantity of the current effective volume of the water tank in the starting moment of the different time periods of one day under the condition of given residence time according to the theoretical outlet flow meter by the control system;
step three, detecting and calculating the actual reserved water quantity of the current effective volume of the water tank through a water quantity detection device, and calculating the inlet flow of the current effective volume of the water tank in different time periods of the day by a control system according to the theoretical outlet flow, the theoretical reserved water quantity and the actual reserved water quantity;
the actual reserved water quantity is the sum of the first water quantity of the current effective volume of the water tank except for the spherical segment and the second water quantity of the current effective volume of the water tank belonging to the spherical segment; the second water quantity calculating method comprises the following steps: firstly, dividing the water level height of the actual water retention quantity into a plurality of types according to the difference of the water level height of the actual water retention quantity on the water surface, determining a formula for calculating the second water quantity for each type, and then calculating the second water quantity according to the corresponding calculation formula;
step four, at the starting time of different time periods of a day, a control system sends a control signal instruction for starting water supply to a water tank or not to a water supply control device according to the result of the step three, if water supply needs to be started, the specific time when the started water supply control device needs to be closed in the time period is calculated, the water supply control device is closed according to the calculation result to stop water supply, water supply in the time period is completed, and water supply in one day is completed according to the circulation;
and fifthly, calculating the volume ratio of the water tank by the control system according to the effective volume currently being used and the average value of the total water flowing out in the first day, and sending an alarm signal for changing the effective volume of the water tank when the volume ratio is smaller than or equal to a set value by the control system, wherein the manager arranges the manager to change the effective volume of the water tank after receiving the alarm signal.
In the first step, two effective volumes are arranged in the water tank through a partition plate, and the partition plate is vertically fixed between two side surfaces in the water tank.
In the third step, the calculation method of the actual water retention amount in the current effective volume of the water tank comprises the following steps:
let the first water quantity be W 1 The second water quantity is W 2 The actual water retention amount in the current effective volume of the water tank is W, and then:
W＝W 1 +W 2 (1)
w in (1) 1 To actually retain water W without taking into account the volume of the segment 2 The volume of the part belonging to the sphere in the actual water retention W.
The first water quantity is obtained by multiplying the water level height of the actual reserved water quantity by the longitudinal sectional area of the current effective volume of the water tank without the ball.
The first water quantity calculating method comprises the following steps:
let the water level in the current effective volume of the water tank be Y, the actual water retention corresponding to the water level Y be W, the longitudinal section area of the current effective volume of the water tank without the ball be S, then:
W 1 ＝Y·S (2)
w in (2) 1 The volume of the segment is not taken into consideration for the actual water retention amount W.
The calculation method of the second water quantity comprises the following steps:
the water tank is provided with n layers, and the height of each layer is H 0 The current effective volume of each layer of water tank contains m outwards protruding spherical segments, the height of each spherical segment is H, the radius of the bottom surface of each spherical segment is r, the distance from the lowest position of each spherical segment to the lowest point of the layer is a, the water level of the actual water retention quantity is Y, and the height of the actual water retention quantity on the layer on the water surface is H, HThe difference value of the water level height Y minus the lowest point height of the water surface layer is also represented, and the water level height Y is divided into the following four types according to the size of H:
mod in formula (3) is the remainder operator; y in (4) 1 The water level Y is expressed as being between the lowest point of each layer and the lowest point of the sphere defect of the layer 2 The water level Y is expressed between the lowest point of each layer of the ball defect and the circle center of the bottom surface of the ball defect 3 The water level Y is expressed as being between the center of the bottom surface of each layer of the ball gap and the highest point of the ball gap 4 The water level Y is indicated to be between the highest point of each layer of the spherical defect and the highest point of the layer;
calculating the second water quantity W according to different types of Y 2 The formula of (2) is:
in (5)
Is a downward rounding symbol, R is the radius of the sphere corresponding to the sphere, W x And W is y Is an intermediate variable (, W) set for easy calculation x And W is y The calculation formula of (2) is as follows:
in the formulae (7) and (8), x is calculated to be W x And the set intermediate variable indicates when y=y 2 Subtracting the difference value of the lowest point height of the layer of the ball defect from the actual water level height Y; in the formulae (9) and (10), y is calculated to be W y And the set intermediate variable indicates when y=y 3 And subtracting the difference value of the circle center height of the bottom surface of the layer of the ball gap from the actual water level height Y.
The invention has the advantages that:
1. the invention fully considers the water supply characteristic of the newly-built building, and sets the water tank to be in a state with two effective volumes, so that the effective volume of water supply can be correspondingly regulated according to the occupancy rate of the newly-built building, and the invention is particularly suitable for water supply of the newly-built building community. In addition, the invention fully considers the actual shape of the water tank, can calculate the actual reserve water quantity in the current effective volume of the water tank according to the water level height, and ensures the accuracy of the calculation result of the actual reserve water quantity in the current effective volume of the water tank. Meanwhile, the quantitative relation between the actual water retention amount and the residence time of tap water in the newly-built floor water tank is found, the theoretical water retention amount is quantitatively calculated according to the given residence time, the inlet flow is calculated according to the calculated theoretical water retention amount, and the water is supplied to the newly-built floor water tank according to the calculated inlet flow, so that the residence time of the tap water in the newly-built floor water tank can be accurately and quantitatively controlled. The risk of exceeding the standard of microorganism fingers caused by overlong residence time of tap water in the water tank is reduced to the maximum extent, the implementation is convenient, and the energy consumption, maintenance cost and operation cost are low in practical operation.
2. The invention provides powerful technical support for accurately controlling water supply of the water tank, and can effectively avoid the technical problem that tap water stays in the water tank for too long.
3. The invention scientifically divides the water level height into four types according to different heights, thereby respectively calculating the actual water retention quantity according to the specific types of the water level height and simplifying the calculation process.
Drawings
FIG. 1 is a schematic view of a longitudinal section of a water tank according to an embodiment of the present invention;
FIG. 2 is a schematic view of a cross section of a water tank according to an embodiment of the present invention;
marked in the figure as: 1. side long side 2, side short side 3, baffle, 4, top surface, 5, bottom surface.
Detailed Description
The invention discloses a water supply method for a volume-variable water tank based on actual water retention, generally speaking, the actual water retention in the water tank comprises two parts, wherein one part is water volume without considering a spherical part and is set as first water volume; the other part is the water quantity corresponding to the part of the sphere, and the water quantity is set as a second water quantity; the sum of the first water quantity and the second water quantity is the actual reserved water quantity of the water tank. Based on the above, the scheme specifically comprises the following steps:
step one, a water tank with two effective volumes is arranged, and one of the effective volumes is selected as the effective volume currently in use of the water tank. Specifically, an original effective volume in the water tank is divided into two effective volumes by a partition plate, and the partition plate is vertically fixed between two side surfaces in the water tank.
Detecting the outlet flow of the current effective volume of the water tank in different time periods of one day continuously for a plurality of days through the outlet flow meter, firstly calculating the average value of the theoretical outlet flow in different time periods of one day and the total water flowing out in one day by the control system according to the outlet flow meter obtained through detection after the detection is finished, and then calculating the theoretical water retention quantity of the current effective volume of the water tank in the starting moment of the different time periods of one day under the condition of given residence time according to the theoretical outlet flow meter by the control system.
And thirdly, detecting and calculating the actual reserved water quantity of the current effective volume of the water tank through a water quantity detection device, and calculating the inlet flow of the current effective volume of the water tank in different time periods of the day by a control system according to the theoretical outlet flow, the theoretical reserved water quantity and the actual reserved water quantity.
And step four, the control system sends control signal instructions whether to start water supply to the water tank or not to the water supply control equipment according to the results of the step three at the starting time of different time periods of a day, if water supply needs to be started, the specific time when the started water supply control equipment needs to be closed in the time period is calculated, the water supply control equipment is closed according to the calculation result to stop water supply, water supply in the time period is completed, and water supply in one day is completed according to the circulation.
And fifthly, calculating the volume ratio of the water tank by the control system according to the effective volume currently being used and the average value of the total water flowing out in the first day, and sending an alarm signal for changing the effective volume of the water tank when the volume ratio is smaller than or equal to a set value by the control system, wherein the manager arranges the manager to change the effective volume of the water tank after receiving the alarm signal.
In the third step, the actual water retention amount is the sum of the first water amount of the current effective volume of the water tank except for the spherical segment and the second water amount of the current effective volume of the water tank belonging to the spherical segment; during calculation, first water quantity of the current effective volume of the water tank except for the spherical segment and second water quantity of the current effective volume of the water tank belonging to the spherical segment are calculated respectively, and then the actual water retention quantity of the current effective volume of the water tank is obtained through summation according to the first water quantity and the second water quantity. The first water quantity is obtained by multiplying the water level height of the actual reserved water quantity by the longitudinal sectional area of the current effective volume of the water tank without the ball. The calculation method of the second water quantity comprises the following steps: the water level of the actual water retention quantity is divided into a plurality of types according to the difference of the water level of the actual water retention quantity on the water surface, a formula for calculating the second water retention quantity is determined for each type, and then the second water retention quantity is calculated according to the corresponding calculation formula.
Specifically, the calculation methods of the actual reserved water quantity, the first water quantity and the second water quantity in the current effective volume of the water tank are as follows:
the calculation method of the actual water retention amount in the current effective volume of the water tank comprises the following steps:
let the first water quantity be W 1 The second water quantity is W 2 The actual water retention amount in the current effective volume of the water tank is W, and then:
W＝W 1 +W 2 (1)
w in (1) 1 To actually retain water W without taking into account the volume of the segment 2 The volume of the part belonging to the sphere in the actual water retention W.
The first water quantity calculating method comprises the following steps:
let the water level in the current effective volume of the water tank be Y, the actual water retention corresponding to the water level Y be W, the longitudinal section area of the current effective volume of the water tank without the ball be S, then:
W 1 ＝Y·S (2)
w in (2) 1 The volume of the segment is not taken into consideration for the actual water retention amount W.
The calculation method of the second water quantity comprises the following steps:
the water tank is provided with n layers, and the height of each layer is H 0 The current effective volume of each layer of water tank contains m outwards protruding spherical defects, the height of each spherical defect is H, the radius of the bottom surface of each spherical defect is r, the distance from the lowest position of each spherical defect to the lowest point of the layer is a, the water level height of the actual water retention quantity is Y, the height of the actual water retention quantity on the layer of the water surface is H, the difference value of the water level height Y minus the height of the lowest point of the layer of the water surface is also represented by H, and the water level height Y is divided into the following four types according to the size of H:
mod in formula (3) is the remainder operator; y in (4) 1 The water level Y is expressed as being between the lowest point of each layer and the lowest point of the sphere defect of the layer 2 The water level Y is expressed between the lowest point of each layer of the ball defect and the circle center of the bottom surface of the ball defect 3 The water level Y is expressed as being between the center of the bottom surface of each layer of the ball gap and the highest point of the ball gap 4 The water level Y is indicated to be between the highest point of each layer of the spherical defect and the highest point of the layer;
calculating the second water quantity W according to different types of Y 2 The formula of (2) is:
in (5)
Is a whole symbol downward, (is the radius of the sphere corresponding to the sphere, W) x And W is y Is an intermediate variable (, W) set for easy calculation x And W is y The calculation formula of (2) is as follows:
in the formulae (7) and (8), x is calculated to be W x And the set intermediate variable indicates when y=y 2 Subtracting the difference value of the lowest point height of the layer of the ball defect from the actual water level height Y; in the formulae (9) and (10), y is calculated to be W y And the set intermediate variable indicates when y=y 3 And subtracting the difference value of the circle center height of the bottom surface of the layer of the ball gap from the actual water level height Y.
The invention adopts the specific technical scheme to fully consider the actual shape of the water tank, can calculate the actual reserve water quantity of the water tank according to the water level height, and ensures the accuracy of the calculation result of the actual reserve water quantity in the water tank, thereby quantitatively controlling the residence time of tap water in the newly built building water tank based on the actual reserve water quantity in the water tank, furthest reducing the risk of exceeding the standard of microorganism fingers caused by overlong residence time of tap water in the newly built building water tank, and simultaneously having convenient implementation and low energy consumption, maintenance cost and running cost during actual running.
Based on the technical scheme, the water tank with the longitudinal section shown in fig. 1 and the cross section dimension shown in fig. 2 is further described by combining specific data, and the specific steps are as follows:
the water tank comprises a side long side 1, a side short side 2, a top surface 4 and a bottom surface 5, wherein the partition plate 3 is fixed in a sealing way to divide an original effective volume in the water tank into two effective volumes, the length, width and height of the water tank are 5m, 3m and 2m respectively, and the total volume without a spherical gap is 30m 3 The longitudinal section S of the current effective volume of the water tank without the ball is 6m 2 The water tank has 2 layers, each layer has a height H 0 The current effective volume of each layer of water tank is 1m, the number m of outwards protruding spherical gaps is 7, the height h of each spherical gap is 0.12m, the radius r of the bottom surface of each spherical gap is 0.4m, and the distance a from the lowest position of each spherical gap to the lowest point of the layer is 0.1m.
At a certain moment, the water level height Y in the current effective volume of the water tank is measured to be 0.886m, and the actual reserved water quantity corresponding to the water level height Y is set to be W, so that the following steps are carried out:
W＝W 1 +W 2 (1)
W 1 ＝Y·S＝0.886m×6m 2 ＝5.316m 3 (2)
w in (1) 1 The calculation method is shown in the formula (2) for the volume of the first water quantity which does not consider the part of the sphere in the water level height Y corresponding to the actual reserved water quantity W; w (W) 2 The water level Y corresponds to the volume of the second water quantity belonging to the segment of the actual reserve water W.
Further, the calculation method of the second water quantity is as follows:
let the height of the actual water retention volume at the layer of the water surface be H, H also represents the difference value of the water level height Y minus the lowest point height of the layer of the water surface, and the type of the water level height Y is determined according to the size of H:
because of
And 0.886m > a+r=0.1 m+0.4m=0.5 m
0.886m<a+2r＝0.1m+2×0.4m＝0.9m
The water level height Y belongs to the third type, namely:
Y＝Y 3 when a+r<When H is less than or equal to a+2r (4)
Mod in formula (3) is the remainder operator; y in (4) 3 The water level Y is indicated to be between the center of the bottom surface of each layer of the sphere defect and the highest point of the sphere defect;
from this, the calculated second water quantity W is determined 2 The formula of (2) is:
in (5)
Is a downward rounding symbol, R is the radius of the sphere corresponding to the sphere, W y Is an intermediate variable set for easy calculation, R and W y The calculation formula is as follows:
in the formulae (9) and (10), y is calculated to be W y And the set intermediate variable indicates when y=y 3 And subtracting the difference value of the circle center height of the bottom surface of the layer of the ball gap from the actual water level height Y.
R and W are as follows y Substituting the value of (2) into formula (5) to obtain:
the second water quantity W 2 Substituting the value of (2) into the formula (1) to obtain the actual water retention W:
W＝W 1 +W 2 ＝5.316+0.2172＝5.5332m 3 。
while the invention has been described with reference to certain embodiments, it is understood that any feature disclosed in this specification may be replaced by alternative features serving the equivalent or similar purpose, unless expressly stated otherwise; all of the features disclosed, or all of the steps in a method or process, except for mutually exclusive features and/or steps, may be combined in any manner.
Claims (4)
1. A method of supplying water to a variable volume tank based on an actual reserve volume, comprising the steps of:
step one, setting a water tank with two effective volumes, and selecting one of the effective volumes as the effective volume currently used by the water tank;
detecting the outlet flow of the current effective volume of the water tank in different time periods of one day continuously for a plurality of days through an outlet flow meter, firstly calculating the average value of the theoretical outlet flow in different time periods of one day and the total water flowing out in one day by a control system according to the outlet flow meter obtained through detection after the detection is finished, and then calculating the theoretical water retention quantity of the current effective volume of the water tank in the starting moment of the different time periods of one day under the condition of given residence time according to the theoretical outlet flow meter by the control system;
step three, detecting and calculating the actual reserved water quantity of the current effective volume of the water tank through a water quantity detection device, and calculating the inlet flow of the current effective volume of the water tank in different time periods of the day by a control system according to the theoretical outlet flow, the theoretical reserved water quantity and the actual reserved water quantity;
the actual reserved water quantity is the sum of the first water quantity of the current effective volume of the water tank except for the spherical segment and the second water quantity of the current effective volume of the water tank belonging to the spherical segment; the second water quantity calculating method comprises the following steps: firstly, dividing the water level height of the actual water retention quantity into a plurality of types according to the difference of the water level height of the actual water retention quantity on the water surface, determining a formula for calculating the second water quantity for each type, and then calculating the second water quantity according to the corresponding calculation formula;
step four, at the starting time of different time periods of a day, a control system sends a control signal instruction for starting water supply to a water tank or not to a water supply control device according to the result of the step three, if water supply needs to be started, the specific time when the started water supply control device needs to be closed in the time period is calculated, the water supply control device is closed according to the calculation result to stop water supply, water supply in the time period is completed, and water supply in one day is completed according to the circulation;
calculating the volume ratio of the water tank by the control system according to the effective volume currently in use and the average value of the total water flowing out in one day in the second step, and sending an alarm signal for changing the effective volume of the water tank when the volume ratio is smaller than or equal to a set value by the control system, wherein a manager arranges the manager to change the effective volume of the water tank after receiving the alarm signal;
in the third step, the calculation method of the actual water retention amount in the current effective volume of the water tank comprises the following steps:
let the first water quantity be W 1 The second water quantity is W 2 The actual water retention amount in the current effective volume of the water tank is W, and then:
W＝W 1 +W 2 (1) W in (1) 1 To actually retain water W without taking into account the volume of the segment 2 The volume of the part belonging to the sphere in the actual water retention W;
the calculation method of the second water quantity comprises the following steps:
the water tank is provided with n layers, and the height of each layer is H 0 Wherein H is 0 The current effective volume of each layer of water tank contains m outwards protruding spherical gaps, the height of each spherical gap is H, the radius of the bottom surface of each spherical gap is r, the distance from the lowest position of each spherical gap to the lowest point of the layer is a, the water level height of the actual reserved water quantity is Y, the height of the actual reserved water quantity on the layer where the water surface is located is H, the difference value of the water level height Y minus the height of the lowest point of the layer where the water surface is located is also represented by H, and the water level height Y is divided into the following four types according to the size of H:
mod in formula (3) is the remainder operator; y in (4) 1 The water level Y is expressed as being between the lowest point of each layer and the lowest point of the sphere defect of the layer 2 The water level Y is expressed between the lowest point of each layer of the ball defect and the circle center of the bottom surface of the ball defect 3 The water level Y is expressed as being between the center of the bottom surface of each layer of the ball gap and the highest point of the ball gap 4 The water level Y is indicated to be between the highest point of each layer of the spherical defect and the highest point of the layer;
calculating the second water quantity W according to different types of Y 2 The formula of (2) is:
in (5)
Is a downward rounding symbol, R is the radius of the sphere corresponding to the sphere, W x And W is y Is an intermediate variable set for convenient calculation, wherein the value range of Y is the same as that of formula (4), R, W x And W is y The calculation formula of (2) is as follows:
in the formulae (7) and (8), x is calculated to be W x And the set intermediate variable indicates when y=y 2 When the actual water level height Y is subtracted by the lowest point height of the layer of the ball defectDifference in degree; in the formulae (9) and (10), y is calculated to be W y And the set intermediate variable indicates when y=y 3 And subtracting the difference value of the circle center height of the bottom surface of the layer of the ball gap from the actual water level height Y.
2. A method of supplying water to a variable volume tank based on actual reserve volume as claimed in claim 1, wherein: in the first step, two effective volumes are arranged in the water tank through a partition plate, and the partition plate is vertically fixed between two side surfaces in the water tank.
3. A method of supplying water to a variable volume tank based on actual reserve volume as claimed in claim 1, wherein: the first water quantity is obtained by multiplying the water level height of the actual reserved water quantity by the longitudinal sectional area of the current effective volume of the water tank without the ball.
4. A method of supplying water to a variable volume tank based on the actual reserve volume of water as claimed in claim 3, wherein: the first water quantity calculating method comprises the following steps:
let the water level in the current effective volume of the water tank be Y, the actual water retention corresponding to the water level Y be W, the longitudinal section area of the current effective volume of the water tank without the ball be S, then:
W 1 =y·s (2) W in formula (2) 1 The volume of the segment is not taken into consideration for the actual water retention amount W.
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