Makeup Source

From SysCAD Documentation

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Contents 1 General Description 2 Diagram 3 Inputs and Outputs 4 Data Sections 4.1 Composition Fetch 4.2 Flow Conditions 4.3 Required Temperature and Pressure 4.4 Summary 4.5 Contents and MF Section 5 Adding this Model to a Project 6 Hints and Comments

General Description

• The Makeup Source acts as an infinite source of material.
• A Makeup Source is used to provide material to any number of Makeup Blocks which are enabled in units in the project.
• The Makeup Source is configured in almost the same way as a Feeder, with the user specifying the mass fractions of the species and the required temperature. However, the user does not specify the amount of material flowing from the unit, as this is the sum of the Makeup Block requirements.
• The Makeup Source will supply the amount of material as required by each Makeup Block and will display the individual flow to each unit, as well as the total flow required.
• The Makeup Source is NOT connected to the Makeup Blocks by a normal link. SysCAD creates a Direct Link which is automatically drawn at the Makeup Block. It is important to note that no links can be connected to the Makeup Source.

Diagram

The Makeup Source unit may be placed on any page in a simulation model. It can then be used on all pages in a model.

Inputs and Outputs

The Makeup Source does not have any inputs or outputs. The Makeup Block(s) are connected indirectly by inserting the name of the Makeup source into the appropriate field, as shown below.

In SysCAD 9.2 the makeup sources are selected from a drop down list of available makeup sources in the project.

Data Sections

1. MakeupSrc-1 - this is the first Tab and is used to configure the following:
   • Set the Temperature and Pressure (if required) of the material from the source; or
   • Copy the composition, temperature and pressure (all three, or a combination of them) from another unit.
2. Content tab - contains data on the material from the Source and may be spread across one or two Tabs, depending on the project and the selected views.
3. MF or MlF - this Tab contains the breakdown of the species contained in the project. This may be spread across one or two Tabs, depending on the number of species in the project. The name of this section will vary depending on the user defined views, i.e. if the view chosen is 'Mass Fraction', then the Tab is called MF. If the view chosen is 'Mole Fracion', then the view will be MlF.
4. QProd - This and subsequent tab pages, e.g. QProd.. and Qm, shows the properties of the stream out of the unit.
5. Info tab - contains general settings for the unit and allows the user to include documentation about the unit and create Hyperlinks to external documents.
6. Links tab, only visible in SysCAD 9.2, contains a summary table for all the input and output streams. This tab allows the user to see how many units are connected to the Makeup Source, and how much material is flowing to each connected unit.
7. Audit tab - contains summary information required for Mass and Energy balance. See Model Examples for enthalpy calculation Examples.

The data sections and variable names are described in detail in the following table.

First Tab -MakeupSrc-1 - The first tab page in the access window will have this name.

Tag / Symbol	Input / Calc	Description / Calculated Variables
Common First Data Section
Composition Fetch
CF.When	Off	No information will be transferred automatically. The user may still manually transfer data from the source by pressing the CF.Fetch button.
	OnceOff	This mode allows a once off automatic information transfer of information at the next project step (if the project is solving) or when project solve/run is started (if the project is stopped). Once the data has been transferred, it will revert back to the off mode.
	Continuous	This mode allows continuous automatic information transfer while the project is solving. This is similar to a cross page connector in terms of material flow but the solver will treat the unit operations separately. Therefore, for large projects with difficult to solve recycle streams, this is a great way of breaking up the solver network to improve solve speed.
CF.What	Nothing	No information will be fetched.
	T, P	Temperature and Pressure information from the CF.Source unit (specified by the user) will be used.
	Comp	Component make up information from the CF.Source unit (specified by the user) will be used.
	T, Comp	Temperature and Component make up information from the CF.Source unit (specified by the user) will be used.
	T, P, Comp	Temperature, Pressure and Component make up information from the CF.Source unit (specified by the user) will be used.
CF.WarnOnZeroSrc	Tick Box	Flag a warning message if the source of the composition fetch drops to zero flow.
CF.What.Quality	Tick Box	Different options will appear in this space depending on the options available. Possible options include: LockUp, Size data and so on.
CF.Source	Input	The user inputs the source unit from where the data is copied.
CF.Fetch	Button	The user may fetch the information from the Source by pressing this button.
Flow Conditions
Temperature/T	Calc	The temperature of the material flowing out of the source.
Density/Rho	Calc	The density of the material flowing out of the source.
Pressure/P	Calc	The pressure of the material flowing out of the source.
Required Temperature and Pressure
VLEquilibrium	Off	Default. No VLE data is applied. The user can enter values for both P_Rqd and T_Rqd.
	Saturated_Liq	Opens the VLE tab page, the Makeup composition will be auto adjusted to saturated LIQUID conditions at the specified Temperature - T_Rqd. Note: only works for components with VLE information.
	Saturated_Vap	Opens the VLE tab page, the Makeup composition will be auto adjusted to saturated VAPOUR conditions at the specified Temperature - T_Rqd. Note: only works for components with VLE information.
	Saturated_Liq (P)	Opens the VLE tab page, the Makeup composition will be auto adjusted to saturated LIQUID conditions at the specified Pressure - P_Rqd. Note: only works for components with VLE information.
	Saturated_Vap (P)	Opens the VLE tab page, the Makeup composition will be auto adjusted to saturated VAPOUR conditions at the specified Pressure - P_Rqd. Note: only works for components with VLE information.
	Subcooled_Liq	This allows the Makeup mixture to be at subcooled conditions. P_Rqd must be  ≥ P_saturated at the specified Temperature.
	Superheat_Vap	This allows the Makeup mixture to be at superheated conditions. P_Rqd must be  ≤ P_saturated at the specified Temperature.
P_Rqd	Input	The required pressure from the source. This is not usually required for a ProBal, or steady state, project.
T_Rqd	Input	The required temperature of material from the source.
Summary
Total.Qm	Calc	The total Mass of material flowing out of the source.
Total.Qv	Calc	The total Volume of material flowing out of the source.
Total.NQv	Calc	The total Normalised Volume of material flowing out of the source.
Total.Moles	Calc	The total number of Moles of material flowing out of the source.
Total.totHs@T	Calc	The total Sensible Enthalpy of the material flowing out of the source.
Total.totHz@T	Calc	The total Enthalpy including Phase Change of the material flowing out of the source.
Total.totHf@T	Calc	The Total Enthalpy of the material flowing out of the source.

Contents and MF Section

The Content and MF (default name) sections allow the user to specify the composition of the material from the source. The MF page MUST be configured, unless the user selects the 'Composition Fetch' option from the first page. The method of setting the composition is described in the Material Fraction Section.

Adding this Model to a Project

Insert into Configuration file

Sort either by DLL or Group.

	DLL:	Basic1.dll	→	Units/Links	→	Process Unit: Makeup Source
or	Group:	General	→	Units/Links	→	Process Unit: Makeup Source

See Project Configuration for more information on adding models to the configuration file.

Insert into Project

Insert Unit

→

Process

→

Unit

→

Makeup Source

See Insert Unit for general information on inserting units.

Hints and Comments

If you want to use makeups on several different flowsheets pointing to the same makeup source, then it is recommended that you put the makeup source on a separate flowsheet.