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: Sep 15, 2026
Humberto, Type525 is intended to somewhat control itself. You give it an intended outlet liquid temperature and it will adjust the compressor spee...
I suppose I would split up my answer into two pieces. TRNSYS the engine is just an equation solver that reads a text input file (of a particular synta...
Getting decent performance data for absorption chillers that can operate at lower hot water temperatures has long been a frustrating problem. We do no...
@antonio Did you play around at all with the parameters that control the number of nodes in the collector and the number of subtimesteps that the mo...
@karaktus I managed to find the report I wrote about that project (it was 2005!) and apparently at the time there was very little data to be found abo...
@karaktus It appears that the other two files are unintentionally missing from the install package. I will need to dig back through some very old arch...
@antonio could you please send your project file (*.tpf) and any other files needed in order to run the simulation to your distributor? If you are not...
@ken I think at the end of the day Type45 has a limited (and not ideal) treatment of IAMs. Other collector models have been brought up to date with mo...
@papillon Philippe, as a follow up to my earlier response I can confirm that you can recompile the TRNDll using the Intel IFX compiler and that the ...
@yalikara yes, that solution is perfectly acceptable for your use case! ~david
@medtab @mariem-s thank you, Mohamed for helping out. As a side note Mariem, you can also send the *.idf to your TRNSYS distributor for direct help.
Silvia, (@silviac) I usually draw the gross window area (glazing + frame) in SketchUp. For the benefit of users who haven't gone through this yet,...
Philippe, (@papillon) We are working on some trials of compiling Trnsys with the IFX compiler and hope to have some information out soon. As a side...
thanks for the suggestion @georgekyr. Would you be open to a more in depth conversation about this? ~david
@yalikara Unfortunately a fix needs to be made to the proforma, which can be done at the standard user level. If you'd like, here are the steps: 1...