Pump 1 - Dynamic
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Navigation: Main Page -> Models -> Pressure Changing Models
NOTE: This method is not available in build138 or later.
Contents
General Description
This page is for project running under
Network solution - Dynamic and Flow Calculation - Simple mode.
The pump model will deliver flow based on the user specified capacity and running speed. In this mode, the pressure is ignored.
For Dynamic Transfer mode, please refer to Pump 1.
Diagram
The diagram shows the default drawing of the Pump, with the required connecting streams. The unit will not operate unless all of the above streams are connected.
The physical location of the connections is not important, the user may connect the streams to any position on the drawing.
Inputs and Outputs
| Label | Required Optional |
Input Output |
Number of Connections | Description | |
| Min | Max. | ||||
| Input | Required | In | 1 | 1 | Input stream to pump. |
| Output | Required | Out | 1 | 1 | Output stream from pump. |
Model Theory
From the first law of thermodynamics, the energy balance is:
[math]\mathbf{\mathit{Work = Enthalpy_{in} - Enthalpy_{out}}}[/math]
From the second law of thermodynamics:
[math]\mathbf{\mathit{Entropy_{in} = Entropy_{out}}}[/math]
Calculating Work:
Step 1) Enthalpy and Entropy in is calculated from the inlet stream Temperature and Pressure.
Step 2) Outlet Temperature and Enthalpy is calculated based on the Entropy and outlet pressure.
Step 3) Work is calculated from the difference in enthalpy.
Assumptions
- The process is in steady state and steady flow.
- The process is adiabatic.
- The change in Potential and Kinetics energy is ignored.
- The process is reversible and adiabatic
Data Sections
Summary of Data Sections
- Pump-1 tab - Contains general information relating to the unit.
- VLE - Optional tab, only visible if the VLEquilibrium is enabled in the Evaluation Block.
- Info tab - Contains general settings for the unit and allows the user to include documentation about the unit and create Hyperlinks to external documents.
- Links tab, contains a summary table for all the input and output streams.
- Audit tab - Contains summary information required for Mass and Energy balance. See Model Examples for enthalpy calculation Examples.
Dynamic Pump Page
Unit Type: Pump-1 - The first tab page in the access window will have this name.
| Tag (Long/Short) | Input / Calc | Description/Calculated Variables / Options |
| Tag | Display | This name tag may be modified with the change tag option. |
| Condition | Display | OK if no errors/warnings, otherwise lists errors/warnings. |
| ConditionCount | Display | The current number of errors/warnings. If condition is OK, returns 0. |
| GeneralDescription / GenDesc | Display | This is an automatically generated description for the unit. If the user has entered text in the 'EqpDesc' field on the Info tab (see below), this will be displayed here. If this field is blank, then SysCAD will display the unit class ID. |
| Qm | Calc | The total mass of material flowing through the pump. |
| Qv | Calc | The total volumetric flow of material flowing through the pump. |
| NQv | Calc | The normalised volumetric flow through the pump. The volume is calculated at Normal Temperature and Pressure (NTP), default values are 25C and 101.325kPa. This is only relevant for flows containing vapours.
NTP can be specified by the user in the configuration file (see Project Configuration). |
| QmPrvPB | Calc | |
| T | Calc | The temperature of material flowing through the pump. |
| P | Calc | The pressure of material flowing through the pump. |
| Rho | Calc | The density of material flowing through the pump. |
| NRho | Calc | The density of material of material flowing through the pump at Normal Temperature and Pressure (NTP). |
| Vf | Calc | Vapour Mass Fraction at the inlet of the pump. |
| mVf | Calc | Vapour Mass Fraction at the inlet of the pump. ???? |
| dPb | Calc | |
| dPq | Calc | |
| PiEst | Calc | The estimated Pressure at the inlet of the pump. |
| Pi | Calc | The actual pressure at the inlet of the pump. |
| dP | Calc | the pressure change in the pump. |
| Po | Calc | The actual pressure at the outlet of the pump. |
| PoEst | Calc | The estimated Pressure at the outlet of the pump. |
| VLEquilibrium | List box | Vapour Liquid Equilibrium (VLE) is enabled here. If this is 'On' then the associated page, VLE becomes visible and may be configured. Note: This option may automatically adjust the species make-up. |
| Eqn... | ||
| Group | Default | Using the pump group of equations. |
| AsMass | On | Allows the user to enter the pump Capacity in mass flow, Qm.Rqd will be settable. |
| off | Allows the user to enter the pump Capacity in volumetric flow, Qv.Rqd will be settable. | |
| Qm.Rqd | AsMass=On | The required pump Capacity in mass flow if the pump is operating at 100% speed. |
| Qv.Rqd | AsMass=off | The required pump Capacity in volumetric flow if the pump is operating at 100% speed. |
| CapacityCtrl | Off | NOTE in Dynamic Simple mode this has no effect |
| ByMass | NOTE in Dynamic Simple mode this has no effect | |
| ByVolume | NOTE in Dynamic Simple mode this has no effect | |
| Eqn.Nominal... NOTE THIS SECTION HAS NO EFFECT ON DYNAMIC Simple MODE | ||
| Method | None | No pressure boost |
| BoostFxd | Fixed Boost - NOTE in Dynamic Simple mode this has no effect | |
| BoostPDrop | Pressure boost with pressure drop proportional to flow - NOTE in Dynamic Simple mode this has no effect | |
| BoostOPPts | Pressure boost based on user specified data - NOTE in Dynamic transfer Simple this has no effect | |
| Boost | Input | The required pressure boost when the Pump is running. |
| Method : BoostPDrop, the following field is visible with this mode. | ||
| Boost | Input | The required pressure boost when the Pump is running. |
| DP | Input | The required pressure drop (based on flow, Qm or Qv is specified below) when the Pump is running. |
| Qm | AsMass=On | Used to work out pressure drop required (above) when the pump is running. |
| Qv | AsMass=Off | Used to work out pressure drop required (above) when the pump is running. |
| Method : BoostOpPts, the following field is visible with this mode. | ||
| BstPt0 | Input | The first point of the Boost pressure (based on 2-point linear relationship) |
| QmPt0 | AsMass=On | The corresponding Mass flow at the first point |
| QvPt0 | AsMass=Off | The corresponding Volumetric flow at the first point |
| BstPt1 | Input | The second point of the Boost pressure (based on 2-point linear relationship) |
| QmPt1 | AsMass=On | The corresponding Mass flow at the second point |
| QvPt1 | AsMass=Off | The corresponding Volumetric flow at the second point |
| Speed... | ||
| Type | Power & Speed | Allows the control of the pump on/off and speed. |
| Fwd Rev | Allows the pump to operate in reverse | |
| Soft Start | Allows the pump to ramp up to its speed over time when started, instead of reaching its capacity in one single iteration. | |
| Soft Start/Stop | Allows the pump to ramp up/down during startup and shutdown, instead of reaching its capacity in one single iteration. | |
| Mode | Simple | Displays minimum fields for normal operation of the pump |
| Command(Latch) | Displays additional fields for control of the pump, usually used when connecting to PLC or operating Systems | |
| Command(State) | Displays additional fields for control of the pump, usually used when connecting to PLC or operating Systems | |
| Power & Speed - Simple, the following field is visible with this mode. | ||
| Run | Tickbox | Toggles the pump on/off |
| Running | Feedback | Returns the status of the pump |
| Tripped | Tickbox | Use this to trip the pump. |
| Manual | Input | Used to override the pump speed, used mainly in control logic / PLC testing. |
| Reqd | Input | The required pump speed. |
| Actual | Calc | The actual pump speed. |
| Regulated | Calc | The regulated pump speed. |
| LoSpeed | Feedback | Signals the pump is at low speed if speed is less or equal to the LoSpeedLimit |
| HiSpeed | Feedback | Signals the pump is at high speed if speed is greater or equal to the HiSpeedLimit |
| LoSpeedLimit | Input | Sets the pump low speed limit. |
| HiSpeedLimit | Input | Sets the pump high speed limit. |
| AutoReStart | Tick Box | Allows the pump to auto restart if the trip condition has be removed if this option is selected. |
| FailMode | None | No Fail mode option. |
| NoStart | Do not start when the pump has failed ?? | |
| NoStop | Do not stop when the pump has failed ?? | |
| NoStartStop | Do not start/stop when the pump has failed ?? | |
| RunMemory | Default | |
| Power & Speed - Command(Latch) or Command(State), the following extra fields are visible with this mode. Usually used when connecting to PLC or operating Systems | ||
| Enable | Tickbox | Toggles the pump on/off |
| Start | Tickbox | Sends the pump start signal |
| Stop | Tickbox | Sends the pump stop signal |
| StartInvert | Tickbox | Sends the pump start invert signal |
| StopInvert | Tickbox | Sends the pump stop invert signal |
| Fwd Rev, the following extra fields are visible with this mode. | ||
| Invert | Tickbox | Toggles Invert signal |
| Forward | Tickbox | Toggles Forward / Reverse |
| Soft Start, the following extra fields are visible with this mode. | ||
| StrtTime | Input | The time it will take for the pump to get to its full speed. |
| MapLo | Input | |
| MapHi | Input | |
| Soft Start/Stop, the following extra fields are visible with this mode. | ||
| StopTime | Input | The time it will take for the pump to stop. |
Adding this Model to a Project
Insert into Configuration file
Sort either by DLL or Group.
|
|
DLL: |
Piping1.dll |
→ |
Units/Links |
→ |
Piping: Pump(1) |
|
or |
Group: |
Mass Transfer |
→ |
Units/Links |
→ |
Piping: Pump(1) |
See Project Configuration for more information on adding models to the configuration file.
Insert into Project
|
|
Insert Unit |
→ |
Piping |
→ |
Pump(1) |
See Insert Unit for general information on inserting units.
