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: Apr 29, 2026
@rodrigo yes, that is the correct procedure. If printing/scanning is a pain, you can just send an email with the pertinent information to techsupport@...
@mastah as a side note, we are working on updating the TRNSYS coding so that future versions will be compatible with the IFX compiler.
@gehadrabee24 It sounds as though you changed the Type534 proforma so as to redesignate one or more derivatives as parameters. There are two ways to r...
@srhayri additionally, you can treat the layer as though it were only resistive rather than having thermal mass. You can then account for the thermal...
Type1531 and 957 are both TESS components. You can contact the developer by emailing techsupport@tess-inc.com. Type1531 was written for Trnsys v18....
@gehadrabee24 I am not sure I understand your question. To set the initial temperature of the tank you open the tank model's proforma, switch to the "...
@danalee Dana, there are two ways that TRACE can be used. The simple way is to select the component whose inputs outputs, and parameters you want t...
@alish this is one of the stranger errors I have run into. My colleagues and I have run the project on a few different computers using exactly the ve...
@danalee The error would suggest that TRNSYS is sending a set of inputs to your *.m code that Matlab cannot solve. You might try adding a TRACE to you...
@alish Ali, it was probably me who suggested that over at techsupport! I'm sorry it didn't solve the problem. Are you just dragging out a Type33 (c or...
@soufiane_ze I am not aware of any freely available components. The TESS component is available at
@soufiane_ze warnings are designed to alert you to a potential problem in your simulation. If there are only a few then they can generally be ignored....
@soufiane_ze if you would like some more information about the commercially available TESS component that I mentioned in an earlier post, you can cont...
@soufiane_ze I don't think it is possible to model a VRF system with the components that are available in the standard library. You will need to get a...
@soufiane_ze It is not really possible to diagnose the cause of the problem from the screen captures. However, if I had to make a guess based on the...