The purpose of this and the following pages is to introduce you to the primary tool that you will be using in the design classes, HYSYS. Now HYSYS comes with a number of excellent reference and tutorial manuals. The Design Lab should be equipped with two complete sets of the manuals. Each set contains the following books: Getting Started, Quick Reference, Tutorials, Applications, Reference Volume 1, and Reference Volume 2. PLEASE do not remove these from the room. The same six volumes may be accessed electronically in Adobe Acrobat format either from the start menu as shown below or via the World Wide Web.
Getting Started and Tutorials are available at http://www.hyprotech.ab.ca/support/dox.htm. The Applications book is available at http://www.hyprotech.ab.ca/support/examples/hysysappexamp.htm. It is far easier to look at the actual books than to worry through the Acrobat Reader, so, again, please don't take them from the room. Note that all referals to manuals are in yellow and if the manual in question is on the HYSYS web page, like the Tutorials Book, then the reference will also be a link.
Because I don't believe in duplication of effort (especially my own), this web page is intended to be complimentary to those manuals. Here on the web page, I hope to fill in the blanks left by the books, serve as a quick reference for some items, and give pointers and links as to the places in the manuals to look immediately for the answers to your questions. Most importantly, however, these pages will provide you with the tips you will need to get your specific tasks done on the specific computer system you will be working with and with this specific version of HYSYS. These tips will include information for both CENG403, where you learn to design individual units, and CENG404, where you will design an entire plant (in fact, this is the only place that you will find many tips for 404, so don't forget to come back and read them again when you start needing them). HYSYS is not the best program for group work (Aspen isn't any better believe me), therefore an entire section has been devoted towards teaching you the best way to work in groups. By the way, NT will allow two different users to edit the same file at the same time. This is bad. If you do this, only one person's work will get saved.
A Little About HYSYS
The goal of programs like HYSYS and Aspen is, of course, to provide you with the capability to design an entire process as completely and accurately as possible. Most (though not all) of the differences between the two lie in their user interfaces. Having gone through the design class with Aspen, I am of the personal opinion that HYSYS has a much better and intuitive interface than Aspen. You have the option of using either simulation package, but I recommend using HYSYS unless you run against something that only Aspen will do. I will try to warn you of all the limitations of HYSYS that you might encounter in advance.
Unlike Aspen, HYSYS does not wait until you've entered everything before beginning calculations. It always calculates as much as it can at all times and results are always available, even during calculations. Any changes that you make to the data are automatically propagated throughout the program to anywhere that entry appears and all necessary recalculations are instantly carried out. It tends to be a lot easier to catch errors this way as you build your simulation. However, there are times when you will not want HYSYS calculating the entire flowsheet over again every time you make a small change. Hence, the existence of the environments. While you are in one environment, calculations in the other environments are placed on hold. Every case (as HYSYS calls each individual simulation file) has two or more environments. The one that contains all the items you expect to see, the streams, unit operations such as reactors, separators, columns, mixers, etc., and various utilities, is the simulation environment. At the top of that environmental hierarchy (and the only one required) is the Case environment and the Main flowsheet. (Aside: both the name "Case" and the tag "Main" are defaults and can be changed in the "Main Properties" view under the Simulation menu). Though the entire simulation may be placed in the Main flowsheet, columns and templates are automatically brought in as Sub-flowsheets. Sub-flowsheets can be thought of as modular programs. You can have as many as you like, nested as deep as you like (though you tend to not need to put additional sub-flowsheets under a column flowsheet).
The other environment, and the one you actually have to deal with first when you start a case, is the basis environment. The basis environment is the place that you define the thermodynamic package you wish to use (Peng-Robinson, Margules, etc.), the components that will be used in your simulation and any reactions that may occur. If dealing with a Petrochemical application, there is also an oil environment that may be reached only from the basis environment.
There are two files that
HYSYS reads whenever you start HYSYS. One of these is the
Preferences File, the other is the workbook format file. The
preferences file tells HYSYS many important things like
which units you want to use, where to look first for your
stored files etc. You can have multiple preference files
saved (or you can just build up various unit sets, etc., in
one file you alter upon need), but the one that is loaded
upon startup is the file named hysys.prf in the
directory from which HYSYS is started. If you launch HYSYS
from your start menu, your user's profile has been
configured with Y:\Hysys as the start directory (note
that if you are not in a design class group, you won't have
a Y drive, because the purpose of theY drive is to save
group work). If you look at the contents of that directory
you will see, in addition to some other stuff, that I have
placed a hysys.prf file in there for you. That is the
file that must be overwritten if you want to make changes to
your default preferences (though changes are automatically
saved to the preference file when you save your simulation,
so overwriting should not often be necessary).
Note: Should you somehow create a Hysys.prf file under your cases directory, DELETE or move it, as you will not be able to get to the example files on Hartsook with it there. An automatic way of telling if your preference file is based on the one I started you with or if it is HYSYS' default is the color of the background. HYSYS' preference file makes the background the same brown color as your desktop. My preference file uses a deep purple as the background color.
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