EP2915926A2 - Procédé de détermination de la caractéristique de système d'un réseau de distribution - Google Patents

Procédé de détermination de la caractéristique de système d'un réseau de distribution Download PDF

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Publication number
EP2915926A2
EP2915926A2 EP15000332.5A EP15000332A EP2915926A2 EP 2915926 A2 EP2915926 A2 EP 2915926A2 EP 15000332 A EP15000332 A EP 15000332A EP 2915926 A2 EP2915926 A2 EP 2915926A2
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Prior art keywords
pressure
ges
point
resistance
sampling point
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EP15000332.5A
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German (de)
English (en)
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EP2915926A3 (fr
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Daniel BÜNING
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Wilo SE
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Wilo SE
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    • E—FIXED CONSTRUCTIONS
    • E03—WATER SUPPLY; SEWERAGE
    • E03B—INSTALLATIONS OR METHODS FOR OBTAINING, COLLECTING, OR DISTRIBUTING WATER
    • E03B5/00—Use of pumping plants or installations; Layouts thereof

Definitions

  • the invention relates to a method for determining the system characteristic of a liquid-conducting distribution network having a plurality of, in particular a plurality of sampling points, which are supplied by a pump system with at least one pump with a delivery pressure, wherein a flow-dependent portion of the system characteristic by the product of a system resistance and a power the flow is described.
  • Such is also more comfortable for the user, because it leads to lower pressure fluctuations at the sampling points.
  • the parameters are also the p- axis section p geo and the slope m, which is deliberately used here for a quadratic function.
  • the resistance coefficient W ges this virtual total sampling point as a parallel circuit of resistance coefficient W 1 , W 2 , ... W n the first and the at least one second sampling point E 1 , E 2 , ... En, where also the resistance coefficient W 1 , W 2 , ... W n the first and the at least one second sampling point E 1 , E 2 , ... En in the second equation are each described by a pressure balance.
  • p E1, E2 p, p ... E n, p tot and the volume flow Q E1, Q E2, ... E Q n, Q ges used.
  • the determination of the pressure ( p E1 , p E2 , ... p E n , p ges ) and / or the volume flow Q E1 , Q E2 , ... Q E n , Q ges takes place only after a waiting time after opening the corresponding removal point E1, E2,... En, so that the system is in a stationary state during the measurement.
  • the determination of the pressure p E1 , p E2 , ... p E n , p ges and / or the volume flow Q E1 , Q E2 , ... Q E n , Q ges ges be triggered automatically as soon as a different from zero and / or a strongly increasing volume flow Q E1 , Q E2 , ... Q E n , Q ges is detected.
  • the determination of the pressure p E1 , P E2 , ... p E n , p ges and / or the volume flow Q E1 , Q E2 , ... Q E n , Q ges automatically terminated as soon as the determined volume flow Q E1 , Q E2 , ... Q E n , Q ges falls below a predetermined minimum value, is substantially zero, and / or a strongly decreasing volume flow Q E1 , Q E2 , ... Q E n , Q tot is detected.
  • a number n of at least two sampling points E1, E2,... En can be used for carrying out the method.
  • the pressure p E3, ... n p e and the flow rate Q E3, ... Q E n in the distribution network are determined during a third sampling point E3 or an n-th sampling point En is open, wherein during the determination of the pressure p ges and the volume flow Q ges while the first and the at least one second sampling point E1, E2 are opened at the same time, this third sampling point E3 or all n used sampling point E1, E2, ... E n are open and form part of the total virtual collection point.
  • the sampling points E1, E2, ... E n can each form a physical sampling point.
  • the first discharge point E1 is a first virtual sampling point, which is formed by the simultaneous openness of two or more first physical tapping points, wherein the resistance coefficient W 1 of the first virtual sampling point by the parallel connection of the resistance coefficients of these two or more simultaneously opened first physical withdrawal points is described.
  • the at least one second removal point E 2 , ... E n can be a second virtual removal point, which is formed by the simultaneous opening of two or more second physical removal points, wherein the resistance coefficient W 2 , ... W n of the second virtual removal point by the parallel connection of the resistance coefficients W 2 , ... W n ) of these two or more simultaneously opened second physical withdrawal points is described,
  • the pump system is preferably controlled along a control characteristic which corresponds to the system characteristic curve which is raised by a desired flow pressure p FL at the sampling points.
  • resistor R system as a time function R (t) is stored in a controller unit, which describes a temporal increase in resistance occurring in the distribution network.
  • the flow pressure p FL can be stored in the regulator unit as a function of time p FL (t) corresponding to the desired flow pressure p FL time dependent, for example, the time of day, day-dependent or dependent on the season, defined.
  • the geodetic height is needed, which can be assumed to be known in principle due to the structural design of the system. If this is not known, a method for determining geodetic pressure p geo , which is caused by a geodetic height H geo in a liquid-conducting distribution network, is proposed, in particular for determining the system characteristic of this distribution network according to the method described above, wherein the distribution network comprises several, in particular a plurality of removal points which are supplied by a pump system with at least one pump with a delivery pressure p , the pump system is operated in the closed state of all sampling points E1, E2, ...
  • the method described here makes it possible to determine the slope of the system characteristic curve and to derive therefrom a control pressure curve which enables energy-efficient regulation of the pressure booster system.
  • FIG. 1 shows a building 1, in which a liquid-carrying piping network 2 is present.
  • a building 1 is the common case. However, the method is applicable to all distribution networks, even without buildings.
  • the pipeline network 2 is connected to a central pressure booster 3, which in the embodiment according to FIG. 1 two speed-controlled pumps 9, each having a downstream in the conveying direction backflow preventer 10 has.
  • a pressure booster 3 with only one pump 9 is also possible.
  • the pressure booster 3 is connected to the low pressure side to a public water supply network.
  • the pressure booster 3 includes a control unit 4 for regulating the output pressure p. However, it also partly handles measurement data processing.
  • Part of the pressure booster system 3 is a pressure sensor 6 and a volumetric flow sensor 7, which are arranged on the output side of the pumps 9 and supply measured values to the control unit 4.
  • the regulator unit 4 consequently has at least the information of the pressure p at the outlet of the system 3 as well as the flow Q through the system 3 available. It should be noted that instead of a measurement of these quantities, a computational determination by means of an observer is also possible. For a later p -v control both values are necessary anyway, therefore offers a direct integration of the measurement in the control unit 4 at. However, it is also possible to determine one of the two measured quantities or both measured variables independently of the control unit 4, and to transfer them to the control unit 4 as required.
  • the pipeline network 2 has a plurality, in particular a plurality of removal points 8, on which the pipeline network 2 each liquid can be removed.
  • the tapping points 8 may be, for example, taps, shower heads, bathtub drains, toilet flushes and / or washing machine or dishwasher connections, ie form any water faucet that can be opened and is closed in the normal state.
  • the building 1 has, for example, six removal points E7 to E12 on the ground floor and six removal points 8 E1 to E6 on the upper floor.
  • the sampling points 8 in the upper floor are located at a geodetic height H geo .
  • an H (Q) diagram with a linear building characteristic 5 is shown, which describes a simplified system characteristic of the system consisting of pressure booster 3, pipe network 2 and tapping points 8.
  • the building characteristic 5 has a p- axis section p geo , which corresponds to the pressure at the geodetic height H geo . It is easy to see that p geo is a minimum pressure that must be built up, so that the water column in the pipeline network 2 reaches the geodetic height of the tapping points 8 on the upper floor at all. If the pressure in the pipe network 2 below geo p, no liquid comes at the sampling points E1 to E6 on.
  • the building characteristic 5 has the slope m , which corresponds to the system resistance R.
  • FIG. 3 shows the building 1 and H ( Q ) diagram on the right with the pump curve 12, which is for a maximum speed.
  • FIG. 4 is entered a further pump curve 13, which applies in double pump operation at maximum speed.
  • the pump 9 is consequently operated at a first rotational speed n 1 ⁇ n max , the maximum rotational speed, at which the pressure booster 3 builds up a corresponding pressure in the pipeline network 2 greater than p geo .
  • the first extraction point E1 ie, for example, a water fitting located there is opened. This is in FIG. 6 shown on the left.
  • the H (Q) diagram in FIG. 6 right shows the pump curve 12 at maximum speed n max , as well as those pump curve 11 of the first speed n . 1
  • FIG. 6 shows the resistance characteristic 14a of the pipeline network 2, also called piping parabola, opened in the illustrated building state with the removal point E1.
  • This results in an operating point B3 operating point, which forms the point of intersection between the resistance characteristic curve 14a and the pump characteristic curve 11.
  • the pressure p E1 and the flow Q E1 assigned.
  • the latter corresponds to the flow Q E1 at the pressure booster 3, so that it can also be measured there, in particular by means of volume flow sensor 7, at least if there is no leakage in the system.
  • the pressure sensor 6 of the pressure booster 3 also sets the pressure p E1 .
  • Both values are transferred to the controller unit 4 and stored in this.
  • the measured values are preferably taken only after a waiting time, in particular a few seconds, for the removal point E1 that has been opened, in order to hide hydraulic transition effects, in particular vibrations in the system. This applies to all determinations of the pressure p E1 , p E2 , p E3 , p ges and the volume flow Q E1 , Q E2 , Q E3 , Q tot , in particular for all measurements alike.
  • the determination of the pressure p E1 and the volume flow Q E1 in the pressure booster 3 is automatically triggered as soon as a non-zero and / or a strongly increasing volume flow Q E1 is detected. This can be done both at the first sampling point E1 and at any other in the process still to be used sampling point E2, E3.
  • a large increase in the flow Q is an indication of a current withdrawal.
  • the pressure booster 3 can thus determine automatically when a removal takes place and when a determination of the volumetric flow Q and the pressure p must be performed folklift.
  • the first removal point E1 is then closed again. This can also be detected in the pressure booster 3 based on the measured values of the volume flow sensor 7, since the volume flow Q drops below a certain minimum value, in particular to zero.
  • the determination of the pressure and the Volumetric flow automatically be terminated at a sampling point 8, here in particular at the first sampling point E1 as soon as the determined volume flow Q drops below a predetermined minimum value, is substantially zero, and / or a strongly decreasing volume flow Q is detected, for example by recognizing that the derivative of the volume flow Q amount exceeds a certain predetermined reference value.
  • a removal is preferably carried out at the second worst sampling point E2, ie at the point at which hydraulic losses are to be expected, which are not so high as at the first sampling point E1, but are still higher than at any other sampling point E3-E12 ,
  • the pump 9 is operated at the same speed n 1 .
  • the second sampling point E2 is associated with its own resistance characteristic curve 14b, which is flatter due to the somewhat shorter tube network resistance or the lower flow path from the pressure booster 3 to the sampling point E2.
  • the pressure p E2 and the volume flow Q E2 in the pipeline network 2, in particular on the output side of the pressure booster 3, are determined, while liquid is withdrawn at only one second removal point 8, E2, ie this second removal point E2 is opened. while all other exit points are closed.
  • the second sampling point E2 is assigned the pressure p E2 and the flow rate Q E2 .
  • the second removal point E2 is then closed again.
  • the procedure described can be continued at a third removal point E3 and optionally at a fourth or further removal point 8, E4,... En.
  • the removal at a third withdrawal point 8, E3 is in FIG. 8 illustrated. It is done here by way of example at the third-worst sampling point E3, ie at the point at which also high hydraulic losses are to be expected, but which are not as high as at the second sampling point E2, but still higher than at any other sampling point E4-E12.
  • the pump 9 is further operated at the same speed n 1 , so that the pump characteristic 11 does not change.
  • the third sampling point E3 is also associated with its own resistance characteristic curve 14c, which is flatter than the previous resistance characteristic curves 14a and 14b due to the lower tube network resistance or the shorter flow path from the pressure booster 3 to the sampling point E3 compared to the withdrawals at E1 and E2.
  • the determination of the pressure p E3 or .... p E n and the volume flow Q E3 or Q En at this third or further removal point 8, E3, ... E n is not required.
  • the inventive method proposes to additionally measure the hydraulic variables pressure and flow during operation of the pump 9, when all those sampling points 8 are opened simultaneously, in the other determinations of pressure and flow to the individual sampling points 8 were open.
  • the opening and closing of all used withdrawal points E1, E2, E3 at the same time can be regarded as opening and closing a virtual total removal point, which is also associated with a resistance characteristic curve 14d in the opened state. This is in FIG. 9 shown on the right. It is even flatter than the first, second and third extraction point E1, E2, E3 associated resistance characteristics 14a, 14b, 14c.
  • the use of two sampling points is sufficient.
  • the design flow of the system or the maximum flow of the pressure booster 3 is achieved. It is not necessary that the used tapping points are in a certain relation to each other, for example, in the distribution network immediately adjacent to each other. Nevertheless, a suitable choice of the sampling points is advantageous in view of the expected pressure losses in the distribution network.
  • sampling points E1, E2, E3, E4 In addition to the individually and jointly measured two, three or even four sampling points E1, E2, E3, E4, other or further combinations of sampling points can be detected, in which not all taps are involved. For example, a combination of the second sampling point E2 with a fifth and / or seventh sampling point E5, E7, or a combination of the first sampling point E1 with the third, a fifth and an eighth sampling point E5, E7. Pressure and flow rate can also be determined for these sampling point combinations and used eg for later control calculations. This is ideally useful during operation, whereby a continuous review of the originally determined system characteristic curve can be performed.
  • an extraction point 8 is understood to mean both a physical removal point and a virtual removal point.
  • physical extraction point is meant, according to the invention, a single point in the distribution network from which liquid can be withdrawn from the distribution network, i. for example, a water fitting.
  • a virtual withdrawal in accordance with the aforementioned virtual removal location, designates a group of two or more locations in the distribution network, i. two or more physical sampling points, which are considered mathematically-hydraulically as a single sampling point for the application of the method according to the invention. This is then also associated with only a single resistance coefficient resulting from the parallel connection of the resistance coefficients of the individual valves.
  • the first sampling point 8, E1 may be a first virtual sampling point, which is formed by the simultaneous opening of two or more first physical sampling points 8, E1, wherein the resistance coefficient W 1 of the first virtual sampling point 8, E1 by the parallel circuit of Resistance coefficients of these two or more simultaneously opened first physical withdrawal points 8, E1 is described.
  • the at least one second sampling point 8, E2,... En can also be an at least second virtual sampling point 8, E2,... En which can be identified by the simultaneous opening of two or more second physical sampling points 8, E2,... En, wherein the resistance coefficient W 2 , ... W n of the second virtual withdrawal point 8, E2, ... En by the parallel connection of the resistance coefficients W 2 , ... W n of these two or more simultaneously opened second physical withdrawal points 8, E2, ... En is described.
  • the pump 9 of the pressure booster 3 at the same time at the respective sampling point E1, E2, E3 and at all used sampling points E1 + E2 + E3 while at the same speed n 1 can be operated, but not necessarily must be the case. Rather, the pump 9 can be operated simultaneously at different sampling speeds at the removal point at the respective removal point E1, E2, E3 and at all used withdrawal points E1 + E2 + E3.
  • the pressure at the transfer point of the public network 15 may vary without limiting the operation of the method described here. It therefore works without speed control.
  • the speed n 1 can be chosen so that the zero head, ie the head H at volume flow Q is equal to zero, at this speed is as high as possible.
  • the speed n is selected so that the zero delivery height does not exceed 90% of the maximum permissible system pressure.
  • the determined values can now be used in equations which respectively describe the resistance coefficients W 1 , W 2 , W 3 , W ges of the individual removal points 8 and the virtual total removal point.
  • a square sampling point resistance W i ie a quadratic dependence of the pressure on the volume flow, can be assumed in order to describe the behavior of the sampling points 8.
  • W 1 p e ⁇ 1 - p geo - R ⁇ Q e ⁇ 1 Q e ⁇ 1 2
  • W 2 p e ⁇ 2 - p geo - R ⁇ Q e ⁇ 2 Q e ⁇ 2 2
  • W 3 p e ⁇ 3 - p geo - R ⁇ Q e ⁇ 3 Q e ⁇ 3 2
  • W ges p ges - p geo - R ⁇ Q ges Q ges 2
  • equation 8 could be solved analytically by substituting equations 4 and 5 for W 1 and W 2 and converting equation 8 to R.
  • the solution of the equation for R is relatively expensive.
  • the system resistance R is therefore calculated by a numerical comparison of a first equation with a second equation, where the first equation is suitably equation 6 and the second equation is suitably equation 7.
  • a numerical comparison of the right side expression of Equation 8 with the left side expression of Equation 8 is performed.
  • This comparison can be made by a numerical minimum value search, wherein the system resistance R is then determined with sufficient accuracy when the difference of the first and second equation Eq. 6, Eq. 7 is below a certain threshold D min , or less than this threshold D min .
  • the threshold value D min can be specified, and, depending on the desired accuracy for R, be 0.1, 0.01 or 0.001, for example.
  • values for the system resistance R are systematically set, the equations 4 and 5 and then equations 6 and 7 are calculated, and the difference between equations 6 and 7 is considered. As soon as this becomes zero or minimal, the set value for the system resistance R is the solution.
  • any starting value can be used, since the minimum search is self-correcting.
  • the system resistance R is usually within a certain known range, for example between 0.01 bar per m 3 / h and 1 bar per m 3 / h, preferably an average of this range can be used as a starting value, so that the minimum search quickly converges, for example, 0.1 bar per m 3 / h.
  • the calculated system resistance R is valid as long as the system is not significantly extended, rebuilt or eg due to deposits in the pipeline network 2 is changed in his resistance. As a rule, this system resistance R is therefore valid for the lifetime of the system and only has to be determined once.
  • the system characteristic curve 5 can preferably be displaced parallel upwards by an amount which corresponds to the mentioned flow pressure p FL .
  • the pump 9 is then preferably controlled along a control characteristic curve 16, which corresponds to the system characteristic curve 5 raised by an amount corresponding to a desired flow pressure p FL at the withdrawal points 8.
  • This control characteristic 16 is then set in the control unit 4.
  • the desired flow pressure p FL is a constant pressure value over the volume flow Q, which is added to each value of the system characteristic curve 5.
  • This flow pressure p FL can be freely selected and changed at any time.
  • the control characteristic 16 raised by p FL is in FIG. 10 shown on the right.
  • a desired flow pressure is stored as a function of time p FL ( t ) in the control unit 4. This allows different flow pressures can be adjusted by the pump system on different days or seasons depending on demand, or increases the flow pressure with time, or lowered, for example, to make gentle pressure transitions for the user.
  • the control characteristic 16 in FIG. 10 on the right is maximum pressure limited as described.
  • the pressure booster 3 and the pump 9 is activated for a certain period T akt and builds a certain pressure in the closed pipe network 2.
  • This pressure can be arbitrary, as far as a permissible maximum pressure is not exceeded.
  • the piping network 2 is thus "charged” to this pressure.
  • T act the pump 9 or the pressure booster 3 again turns off automatically. Due to the backflow preventer 10, the pressure built up persists.
  • the removal point 8 is opened, which is located at the highest.
  • the first sampling point E1 can be used, since they are the highest and furthest to the pressure booster 3 away location is.
  • the pressure relaxes and the guided in the pipeline network 2 liquid runs out as long as at the first removal point E1 prevails a media pressure over handover pressure.
  • FIG. 5 illustrates how the operating point B1 changes due to the leakage of the liquid.
  • this is an "operating point", although there is no active operation of the pressure booster 3.
  • a system state is referred to. Since the piping network 2 does not convey liquid, but the pressure in it degrades, the operating point moves downwards along the p-axis. If no more liquid runs out of the first removal point E1, the pipeline network 2 is completely relaxed and the first removal point E1 can be closed again. It then rests in the riser a water column, which comes up to the first sampling point E1. Through the opening to the atmosphere, this column of water experiences no static pressure. In this state, which is defined by the operating point B2 in FIG. 5 is marked, corresponds to the pressure at the output of the pressure booster 3 exactly the geodetic pressure p geo .
  • a method for determining the geodetic pressure p geo caused by a geodetic height H geo in a liquid-conducting pipeline network 2, in particular for determining the system characteristic 5 of this pipeline network 2 according to the method described, wherein the pipeline network 2 comprises several, in particular a plurality of removal points 8, which can be supplied by a pressure booster 3 with at least one variable speed pump 9 with a delivery pressure p , and the pump 9 is operated in the closed state of all sampling points 8 for a certain period of time T akt to build a certain pressure p in the piping network 2 , After the time T akt the highest removal point 8, E1 is opened to reduce the pressure p in the pipeline network 2, and the geodetic pressure p geo then measured at the output of the pressure booster 3, when no more liquid from the geöf Open withdrawal point 8, E1 exit.
  • the described charging of the pipeline network 2 advantageously offers the possibility to check for leaks. If the built-up pressure is slow degraded without a sampling point 8 is open, there is a leak that indicates a leak in the system. The leakage losses are thus clearly visible as a reduction of the pressure in the system. Preferably, it can be provided that these pressure losses are displayed directly by the pressure booster 3, so that in the event of leaks, the system can then be checked and optimized.
  • the system should preferably be completely vented and completely closed so that no leakage occurs.
  • a possibly existing expansion vessel of the pump system 3 should be shut off during the process, in particular when determining the pressure p geo of the geodetic height H geo .
  • the inventive method determines the pressure and the flow rate in the pipeline network 2 at certain times, in particular to measure. These times can be set manually by a user, for example by acknowledging a system state that has been reached at the pressure booster 3, in particular at its control unit 4. However, since the user then has to go back and forth between the pressure booster 3 and the or the sampling points 8, this is a cumbersome procedure.
  • the user may provide the pump set with an acknowledgment of a system condition remotely, such as wired or wirelessly using a mobile device capable of communicating to the pressure booster 3 a corresponding message. However, this too is complicated and requires the said mobile device.
  • the pressure booster 3 automatically recognizes when it should perform a determination of the pressure and the flow rate, or in the event that pressure and flow rate are continuously measured when a corresponding measurement for a particular system state to be adopted , This can preferably be done by the pressure booster 3 or its control unit 4, the volumetric flow readings monitors and detects the change in system state from a steep edge in the volumetric flow readings. This can then serve as a trigger for a measured value transfer.
  • the determination of the pressure p E1 , p E2 , ... p E n , p ges and / or the volume flow Q E1 , Q E2 , ... Q E n , Q geset be automatically triggered as soon as a different from zero and / or a strongly increasing volume flow Q E1 , Q E2 , ... Q E n , Q ges is detected. Accordingly, the determination of the pressure p E1 , p E2 , ... p E n , p ges and / or the volume flow Q E1 , Q E2 , ... Q E n , Q geset be automatically terminated as soon as one of volume flow Q E1 , Q E2 , ... Q E n , Q ges of zero, essentially zero, and / or a sharp sinking volume flow Q E1 , Q E2 , ... Q E n , Q tot is detected.
  • the controller unit 4 can for this purpose have a wizard mode with which the system passes through the individual steps and states in succession. This can be activated for example when commissioning the pressure booster 3.
  • Assistant mode uses characteristic curves of pressure and flow rate to detect when relevant system values are approached, and also stores measured values for pressure and flow independently.
  • Figure 2 shows an example of the course of the sensor variables volume flow Q sensor , pressure p sensor and the subsequently set speed n pump of the pump 9 over time. This will be explained below.
  • the system After activating the wizard mode at time t 0 , the system is charged. For this purpose, the pump 9 is operated for the period T act at maximum speed n max , which builds up a corresponding pressure. This remains largely also exist, although it comes as a result of leaks in the pipeline network 2 to a slight pressure reduction.
  • n max maximum speed
  • a user now opens the first removal point E1, which leads to a rapid pressure reduction. The beginning of this period is recognized by the drop in pressure, see t 1 in Figure 2.
  • the pressure booster 3 detects this rapid pressure reduction due to the rapidly falling readings and stores a short time later within the period T1 the pressure applied at the output of the booster 3 pressure p sensor as geodetic pressure p geo .
  • the pump 9 is operated again by the control unit 4, this time at a speed which is less than the maximum speed. This initiates period T2.
  • the still open sampling point E1 is then flowed through, whereby a corresponding steep increase in the volume flow Q sensor takes place.
  • the control unit 4 now measures automatically within the period T2 the values assigned to the first removal point E1 for pressure p sensor and volume flow Q sensor .
  • the first sampling point E1 is closed by the user again.
  • the pressure booster 3 recognizes this because the volume flow Q sensor falls to zero.
  • the pump 9 is still operated at the same speed.
  • the user opens the second removal point E2, which again causes a corresponding steep increase in the volume flow Q sensor and the period T3 is initiated.
  • This increase is recognized again independently by the pressure booster 3, so that it can automatically measure within the period T3 the values associated with the second sampling point E2 for pressure p sensor and volume flow Q sensor .
  • the second removal point E2 is closed by the user again.
  • the pressure booster 3 recognizes this again because the volume flow Q sensor falls to zero.
  • the pressure booster detects the steep increase in the flow rate at time t 6 and determines pressure and flow within the current period T4.
  • the period T4 is ended and the period T5 is started. Due to the additional opening of the first sampling point E1 at the time t 8, the period T5 is ended and the period T6 is started. Both are recognized in each case by the steep flanks in the measurement signal of the volume flow sensor of the pressure booster 3.
  • the pressure booster 3 Based on the fact that there were twice before a rising and a subsequent falling edge in the flow, namely at the beginning of Periods T2 and T3, but on the next rising edge no falling edge followed, the pressure booster 3 knows that three sampling points E1, E2, E3 will be used. Thus, the pressure booster system is also known that in the subsequent to the time t 8 period T6 all three sampling points E1, E2, E3 are open, so that in this period T6 of the pressure and the volumetric flow reading for the virtual total sampling point can be taken. The beginning of this period T6 is thus recognized by the multiple increase of the flow.
  • the removal points E1, E2, E3 are then closed again in succession, which recognizes the pressure booster 3 based on the steeply falling volume flows.
  • the sensor values from the periods T1, T2, T3, T4 and T6 are stored in the controller unit 4 and then used for the calculation of the system resistance R. Within the specified time periods, several values can also be offset to an averaged value.
  • the described assistant mode no longer requires the user to acknowledge something after the opening and / or closing of a removal point on the pressure booster. The measurements can therefore be carried out very comfortably.

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  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Hydrology & Water Resources (AREA)
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  • Management, Administration, Business Operations System, And Electronic Commerce (AREA)
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  • Control Of Non-Positive-Displacement Pumps (AREA)
EP15000332.5A 2014-02-05 2015-02-05 Procédé de détermination de la caractéristique de système d'un réseau de distribution Withdrawn EP2915926A3 (fr)

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DE102014001413.4A DE102014001413A1 (de) 2014-02-05 2014-02-05 Verfahren zur Bestimmung der Systemkennlinie eines Verteilernetzes

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EP2915926A3 EP2915926A3 (fr) 2015-10-28

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Cited By (4)

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CN106972501A (zh) * 2016-01-13 2017-07-21 清华大学 一种配电网控制的方法
WO2018099937A1 (fr) 2016-11-30 2018-06-07 RMBLStrip AB Système de guidage ou de déviation d'air et procédé d'actionnement d'un tel système
EP3508730A1 (fr) * 2018-10-01 2019-07-10 Wilo Se Procédé de réglage d'une installation d'augmentation de la pression
CN115310212A (zh) * 2022-10-12 2022-11-08 中汽研（天津）汽车工程研究院有限公司 一种汽车减震器特性数据抽样方法

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JP5723642B2 (ja) * 2011-03-18 2015-05-27 株式会社日立製作所 配水圧制御システム

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106972501A (zh) * 2016-01-13 2017-07-21 清华大学 一种配电网控制的方法
CN106972501B (zh) * 2016-01-13 2020-09-15 清华大学 一种配电网控制的方法
WO2018099937A1 (fr) 2016-11-30 2018-06-07 RMBLStrip AB Système de guidage ou de déviation d'air et procédé d'actionnement d'un tel système
CN109963776A (zh) * 2016-11-30 2019-07-02 兰博思卓股份公司 空气引导或偏转系统以及操作该系统的方法
EP3508730A1 (fr) * 2018-10-01 2019-07-10 Wilo Se Procédé de réglage d'une installation d'augmentation de la pression
CN115310212A (zh) * 2022-10-12 2022-11-08 中汽研（天津）汽车工程研究院有限公司 一种汽车减震器特性数据抽样方法

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