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.
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  • 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.
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Ken
@ken
Trusted Member
Joined: May 14, 2023
Last seen: Mar 29, 2026
Topics: 15 / Replies: 24
Reply
Answer to: How do I derive from ICC-SRCC or Solar Keymark test report the "Incidence angle modifier constant" to use as parameter for a collector?

Thank @DavidBradley you for your feedback. I did it indeed and found that, there are usually two distinct slopes (see enclosed file), for all c collec...

1 week ago
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Answer to: How to model multiple thermosiphon systems with Type 45a in TRNSYS?

Thank you very much @a_weiss for these suggestions. They represent several valuables options for me. Thanks

5 months ago
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RE: Is there any tool in TRNSYS to perform a kind of inverse technique to estimate unknown parameters of a component based on experimental data?

@davidbradley Thank you for this suggestion. I am not familiar with TRNOpt but I have seen that we have it. I will install GenOpt and try. However, gi...

2 years ago
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RE: Type 45a: how to modify the friction factor?

@A_Weiss. Thank you for your feedback. Actually, when Re is less than 2000, f = Re/64 for friction factor calculation for laminar flow in a circular p...

2 years ago
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RE: Type 45a: how could a heat exchanger be included in the tank model?

@A_Weiss, thank you for that suggestion. I have had a look on Type 1346 and Type 1537 and I see that I could imagine a model to connect them. But to a...

2 years ago
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RE: Type 45a: how could a heat exchanger be included in the tank model?

@davidbradley I wonder if there is any TESS component doing the same job...

2 years ago
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RE: Type 45a: how to modify the friction factor?

@davidbradley Thank you for your feddback. I will try to modify the code source. I know it is sometimes very challenging. But definitely, there is a ...

2 years ago
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