About Items
A model is a collection of items. There are a number of different types of items you can add to a model. Items can be primitive or complex. Primitive items are graphic items (lines, polylines, polygons, text, etc.). Complex items include Composite, Connector, Stream and Sequencer items.
The Three_Compound_Washers model from the Examples project does a heat and material balance for three drums washers in series.
The model is a collection of items:
- three Compound_Washer items
- four Pulp_Stream items (brown),
- four Liquor_Stream items (yellow),
- four TDS_Sensor items,
- a SteadyState_Sequencer item,
- an Ole Item and
- a rectangle item.
Each washer item refers to the Compound_Washer Composite Model. The three washers are complex items. We also refer them as compound blocks.
Each stream item refers to Stream Models. Stream items transfer data (in this case material flows) from one composite item to another.
The sensor items refer to sensor Composite Models. The SteadyState_Sequencer is used to define the calculation sequence. The text in red TDS_Sensor (xxx.xxx lbs/hr TDS) is a sensor showing the total dissolved solids flow in the adjacent stream. These are complex items.
The OLE item contains an Excel chart showing the dissolved solids fraction in the pulp and filtrate streams leaving each washer.
| Related Topics |
| About models |
| Libraries of items |