[Bldg-sim] Release of the TESS Libraries version 18 for TRNSYS

Tim McDowell mcdowell at tess-inc.com
Fri Dec 17 07:09:29 PST 2021

It’s hard to believe, but it’s been over 10 years since we released a 
major upgrade to the TESS Libraries – the essential add-on modeling 
package to the popular TRNSYS software program. Fortunately, the wait is 
over!  We’ve been busy over these last 10 years; writing new models, 
upgrading existing models, and adding new tools.  But more importantly, 
we’ve been listening to our users as to the best ways to improve the 
package to make it easier to use, more powerful, and even more flexible.

The latest release of the libraries features over 350 models/routines 
for studying today’s most pressing simulation topics ranging from 
de-carbonization to renewable energy to electrification while 
maintaining and expanding the libraries for the always important 
building energy systems, solar energy applications, thermal storage and 
ground coupling.  In this new package, we’ve included 80 brand new 
component models that have never before been released.  A full list of 
the component models in each of our 14 libraries can be found at our 
website (www.trnsys.com) and a short document explaining all that’s new 
in this latest release can be found at:

For our new users, please consider including the TESS Libraries when you 
purchase TRNSYS – it will greatly improve your simulation capabilities.  
For our existing users – THANK YOU.  This release wouldn’t be possible 
without your support, enthusiasm, ideas and suggestions.  For that 
reason, we have aggressively priced the upgrade cost to the new 
libraries as our way of saying thanks to all those that have contributed 
to this unique collection of some of the best TRNSYS models in the 

Have a question or an idea on how to improve the libraries?  Drop us a 
an e-mail at techsupport at tess-inc.com

Timothy P McDowell
Executive Vice President
Thermal Energy System Specialists, LLC
3 N Pinckney St, Suite 202
Madison, WI 53703
Phone: 608-274-2577
Cell: 608-225-5250

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