Unit operations - Overview

The following pages contain information about the unit operations available. A unit operation is an elementary step in a process. It takes some input stream(s), adds or extracts heat and work, and returns some output stream(s).

Most unit operations, such as a compressor, will correspond to physical equipment in a real process. Some unit operations do not correspond to physical operations but are used to specify the logic of the process, for example what the product stream of the process is, or constraints for the solver. These are here referred to as logical unit_operations, and the most important ones are:

• Feed Stream: Specifies inlet conditions to a process.
• Product Stream: Collects outlet from a process.
• Cycle Stream: Specifies the mass flow and composition of a closed loop.
• Recycle: Helps the solver solve in processes with feedback loops (recycling).
• Adjust: Adjusts the properties of a Unit to obtain a desired target value in a stream or another Unit.
• Heat flows: Allow heat to be transferred between units.

Consult the index on the left to see the documented unit operations. Let us know if you think a page is missing, incomplete, or hard to understand.