Calculating exergy in flowsheeting simulators: A HYSYS implementation

A straightforward method for calculating physical and chemical exergies of material stream has been proposed. Furthermore, proposed procedure for exergy calculation has been implemented in one of the most widely-used flowsheeting simulators, namely HYSYS by utilizing fifteen main user variables for material streams. Visual Basic codes required for each of the mentioned user variables have been also presented within the text. Such computer-aided exergy calculations will make exergy analysis more accessible in HYSYS process simulator resulting in more insight into the nature of irreversibilities associated with specific process.

► Definition of a simple straightforward procedure for calculating physical and chemical exergies of material streams.
► Description of how to implement the proposed procedure within HYSYS simulator.
► Development of Visual Basic codes required for each of the user variables defined within HYSYS.
► Description and presentation of two numerical examples.