Welcome to the TRNSYS Users Forum.
The forum is a place where people can interact and have discussions about different topics involving the use of the TRNSYS software package. Here you can post topics for discussion or questions on using TRNSYS and get advice from other users or TRNSYS experts. This forum is not intended for detailed technical support. Users should contact their distributor’s hotline for such assistance.
Some tips for success on using the forum:
- Follow the Forum Rules posted in Forum Administration.
- There are categories for different types of topics and questions. Post your topic or question into the proper category.
- Before posting a topic or question search the existing topics (and the TRNSYS Users listserv archive or Post archive) to see if a similar topic or question has already been answered.
- Use a descriptive topic name. Don’t use attention getting subjects, they don’t get attention and only annoy people.
- State the version of TRNSYS and which add-ons your are using.
- Include enough specific details for your topic of question to be answered. Just posting “Why am I getting an error?” without describing the specific error and what you are trying to do when you get the error will not receive a response that fixes your issue.
- Remember when people help you, they are doing you a favor. Be patient, help people out by posting good descriptions of what you need help with, and be polite even if a response does not solve your issue.
- Moderators may edit your post for clarity or move your topic to a more appropriate category.
Last seen: Mar 19, 2026
@shamsoddinghiami In short, there is no pump model that considers a variable fluid viscosity. The reason for this is that most models reference a ...
@bilal This error likely stems from an incorrect definition in the control/simulation cards found in Settings -> Advanced Settings. Similar error...
@ellamae Tinting primarily impacts the solar heat gain of a window, but is not always so simple as its affect may apply only to certain wavelength o...
This issue may be related to an error in writing the *.idf file. Start by making sure SketchUp is completely closed then reopen SketchUp and load the ...
@kashif10 It would be a more effective use of time to contact your distributor's technical support team with your project file (.tpf), list file (.ls...
@kashif10 Notice 26 indicates that Type205 was found in Type205_x64.dll suggesting that there is an error somewhere in the source code of Type205. I ...
@kashif10 The problem may be identifiable by filtering the messages for notices (opposed to warnings and errors) and looking for a few scenarios. 1)...
@leomodra These calculations are detailed in Section 7.4.4.5 of the Programmer's Guide, which is found in the TRNSYS18\Documention directory. chee...
@jay Without running your project through the compiler, it is not possible to know what is happening. I urge you to contact your distributor's techn...
@jay Since there is no error message and TRNEXE continues to run, it is possible the simulation is caught in an infinite loop. I would recommend you...