Hướng dẫn sử dụng WaterCAD

Quick Start Lessons Building a Network and Performing a Steady-State Analysis Extended Period Simulation Scenario Management Reporting Results Automated Fire Flow Analysis Water Quality Analysis Darwin Designer to Optimize the Setup of a Pipe Network Darwin Designer to Optimize a Pipe Network Scenario Energy Costs Pressure Dependent Demands Criticality and Segmentation Flushing Building a Network and Performing a Steady-State Analysis In constructing a distribution network for this lesson, you not need to be concerned with assigning labels to pipes and nodes, because Bentley WaterCAD V8i will assign labels automatically When creating a schematic drawing, pipe lengths are entered manually In a scaled drawing, pipe lengths are automatically calculated from the position of the pipes’ bends and start and stop nodes on the drawing pane In this network, the modeling of a reservoir connected to a pump simulates a connection to the main water distribution system Simplifying the network in this way can approximate the pressures supplied to the system at the connection under a range of demands This type of approximation is not always applicable, and care Bentley WaterCAD V8i User’s Guide 2-1 Building a Network and Performing a Steady-State Analysis should be taken when modeling a network in this way It is more accurate to trace the network back to the source In this lesson, you will create and analyze the network shown below You will use a scaled background drawing for most of the network; however, four of the pipes are not to scale and will have user-defined lengths Step 1: Create a New Project File From the welcome dialog, click Create New Project and an untitled project opens Or click File > New to create a new project 2-2 Bentley WaterCAD V8i User’s Guide Quick Start Lessons Click the Tools menu and select the Options command Click the Units tab Since you will be working in System International units, click the Reset Defaults button and select System International Verify that the Default Unit System for New Project is set to System International If not, select from the menu Click the Drawing tab to make sure Drawing Mode is set to Scaled Set the Plot Scale Factor cm = 40 m Click OK Set up the project Choose File > Project Properties and name the project Lesson 1—Steady State Analysis and click OK Choose File > Save as In the Save File As dialog box, browse to the My Documents/Bentley/WaterGEMS folder Bentley WaterCAD V8i User’s Guide 2-3 Building a Network and Performing a Steady-State Analysis Enter the file name MYLESSON1.WTG for your project, and click Save Step 2: Lay out the Network Select Pipe from the layout toolbar Move the cursor on the drawing pane and right click to select Reservoir from the menu or click the toolbar Click to place R-1 Move the cursor to the location of pump P-1 Right-click and select Pump from the shortcut menu Click to place it 2-4 Bentley WaterCAD V8i User’s Guide from Quick Start Lessons Right click to select Junction from the menu and click to place J-1 Click to place junctions J-2, J-3, and J-4 Click on J-1 to finish Right-click and choose Done from the menu 10 Create J-5 a Select the Pipe layout tool again b Click junction J-3 c Move the cursor to the location of J-5, and click to insert the element d Right-click and select Done 11 Lay out junction J-6 and the PRV by selecting the Pipe layout tool and placing the elements in their appropriate locations Be sure to lay out the pipes in numerical order (P-7 through P-9), so that their labels correspond to the labels in the diagram Right-click and select Done from the menu to terminate the Pipe Layout command 12 Insert the tank, T-1, using the Pipe layout tool Pipe P-10 should connect the tank to the network if you laid out the elements in the correct order Bentley WaterCAD V8i User’s Guide 2-5 Building a Network and Performing a Steady-State Analysis 13 Save the network by clicking Save or choose File > Save Step 3: Enter and modify data • Dialog Boxes—You can use the Select tool editor and double-click an element to bring up its Properties • FlexTables—You can click FlexTables to bring up dynamic tables that allow you to edit and display the model data in a tabular format You can edit the data as you would in a spreadsheet • User Data Extensions—The User Data Extensions feature (Tools menu > User Data Extensions) allows you to import and export element data directly from XML files • Alternative Editors—Alternatives are used to enter data for different “What If?” situations used in Scenario Management Entering Data through the Properties Editor 2-6 Bentley WaterCAD V8i User’s Guide Quick Start Lessons To access an element’s property editor, double-click the element Open the Reservoir Editor for reservoir R-1 Enter the Elevation as 198 (m) Set Zone to Connection Zone a Click the Zone menu and select the Edit Zones command, which will open the Zone Manager b Click New c Enter a label for the new pressure zone called Connection Zone Bentley WaterCAD V8i User’s Guide 2-7 Building a Network and Performing a Steady-State Analysis d Click Close e Select the zone you just created from the Zone menu Click tank T-1 in the drawing to highlight it and enter the following: Elevation (Base) = 200 m Elevation (Minimum) = 220 m Elevation (Initial) = 225 m Elevation (Maximum) = 226 m Diameter = m 2-8 Bentley WaterCAD V8i User’s Guide Quick Start Lessons Section = Circular Set the Zone to Zone (You will need to create Zone-1 in the Zone Manager as described above.) Click pump PMP-1 in the drawing to highlight it a Enter 193 (m) for the Elevation b Click in the Pump Definition field and click on Edit Pump Definitions from the drop-down list to open the Pump Definitions manager Bentley WaterCAD V8i User’s Guide 2-9 Building a Network and Performing a Steady-State Analysis c Click New to create a new pump definition d Leave the default setting of Standard (3 Point) in the Pump Definition Type menu e Right click on the Flow column and select the Units and Formatting command f In the Set Field Options box set the Units to L/min g Click OK h Enter the following information: 2-10 Bentley WaterCAD V8i User’s Guide Criticality and Segmentation Double-click the PDDfunction alternative to verify which PDD function is being used, that the reference pressure (the pressure at which all demand is met) is equal to the threshold pressure, and that 100% of the demand is pressure dependent Close the alternative editor and the Alternatives manager Click Analysis > Criticality Highlight Criticality Studies and click the New button Check the box for AveDayPDD 2-144 Bentley WaterCAD V8i User’s Guide Quick Start Lessons Click OK On the Segmentation Scope tab, select Entire Network from the Scope Type menu Select AveDayPDD and click Compute appears Bentley WaterCAD V8i User’s Guide Click Yes in the prompt that 2-145 Criticality and Segmentation The segmentation results are the same as the first scenario because the same valving is used 10 Select Criticality below AveDayPDD Check the Run Hydraulic Engine? box and click Compute 11 Right click on the System Demand Shortfall column and select Sort > Sort Descending 2-146 Bentley WaterCAD V8i User’s Guide Quick Start Lessons Notice that the shortfalls have increased over the previous runs because the runs that incorporate PDD account for the impact on nodes that receive water but at a lower pressure than under normal circumstances 12 Close the Criticality manager Bentley WaterCAD V8i User’s Guide 2-147 Criticality and Segmentation Flushing In this Quick Start lesson, you will set up and run a series of conventional flushes (no valve operation) and one unidirectional flush Open the model called QuickStartFlush Then zoom to the south west portion of the model View > Zoom > Window so that it looks like below: Pick Analysis > Flushing or click on the Flushing button on the toolbar [show button] This opens the flushing manager dialog Pick Avg Daily Demand as the Representative Scenario in the right pane In the left pane, highlight "Base Flushing", pick the Rename button (third from left on top) and change the name to "Conventional" 2-148 Bentley WaterCAD V8i User’s Guide In the right pane, create a pipe set for which you will calculate flushing properties by picking the ellipse next to Pipe Set, and Select in Drawing Select the pipes shown below (It may be necessary to zoom in to some of the shorter pipes to select them.) Pick the check box to complete the selection Pick OK Bentley WaterCAD V8i User’s Guide 1-149 Set the Flow Emitter Coefficient to 150 The dialog should look like this: Pick the Events tab over the right pane and then while highlighting "Conventional" in the left pane, pick New (first button on left top) > New Conventional Events (Batch) and select hydrants H-1 through H-8 and click the check mark 1-150 Bentley WaterCAD V8i User’s Guide The Flushing Manager will look like this: You can run the events in sequence by clicking the Compute button (fourth from left in left pane) 10 To check the results, open the Flushing Results Browser (fifth button from left in left pane) It shows the effect of each event 11 Close this Browser and open the Flushing Area flex table View > Flex Tables > Flushing Area Report Right click on the Velocity Maximum Flushing column and Sort > Descending (or Filter on Velocity > 0) This table shows the Velocity and Shear Stress for the pipes in the Pipe Set All of these exceeded the Target Bentley WaterCAD V8i User’s Guide 1-151 12 Close the Flex Table 13 Next you will set up a unidirectional flushing event to increase the velocity in a run of pipes along the southwest edge of the system Highlight Flushing study in the left pane, pick new (first button on top), pick New Unidirectional Event Highlight "Area1", pick Rename and call it "Uni-SW" 14 Pick Avg Day Demand as the Representative Scenario, set the Emitter coefficient to 150 and create the Pipe Set as shown 1-152 Bentley WaterCAD V8i User’s Guide 15 Pick the check and view the Pipe set 16 Click OK Bentley WaterCAD V8i User’s Guide 1-153 17 Select the Events tab to create a unidirectional event by picking New Unidirectional Event from the top left pane Then pick the valves shown below to close and hydrant H-5 to flow as shown below 18 After picking the elements and picking the check mark, review the list of elements to be operated Feel free to add some descriptive notes to the elements to be operated 1-154 Bentley WaterCAD V8i User’s Guide 19 Identify the pipes to be part of the Pipe Run, by picking the Select from Drawing button on the right pane Highlight the third button in the Select dialog (the second button closes pipes) Once again, it may be desirable to use the mouse wheel to zoom in to the shorter pipes 20 With all of the elements identified, select the Compute button (fourth from left in left pane) Bentley WaterCAD V8i User’s Guide 1-155 21 Once the run is complete, open the Flushing Browser (fifth button on left pane), and view the results 22 Click the highlight button (second from left) and view the event in the drawing 1-156 Bentley WaterCAD V8i User’s Guide 23 Click on the Operator Report (sixth button on left pane) Bentley WaterCAD V8i User’s Guide 1-157 24 Close the report to get back to WaterGEMS 1-158 Bentley WaterCAD V8i User’s Guide ... Click to Save 2-16 project Bentley WaterCAD V8i User’s Guide Extended Period Simulation Extended Period Simulation This lesson will illustrate how Bentley WaterCAD V8i can model the behavior... as In the Save File As dialog box, browse to the My Documents/Bentley/WaterGEMS folder Bentley WaterCAD V8i User’s Guide 2-3 Building a Network and Performing a Steady-State Analysis Enter the... location of pump P-1 Right-click and select Pump from the shortcut menu Click to place it 2-4 Bentley WaterCAD V8i User’s Guide from Quick Start Lessons Right click to select Junction from the menu