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.

A_Weiss
A_Weiss
@a_weiss
Moderator
TESS Engineer
Joined: Jan 19, 2023
Last seen: Nov 25, 2024
Topics: 11 / Replies: 144
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Answer to: Type 45a: how could a heat exchanger be included in the tank model?

@ken Sorry, I didn't mean to imply that the thermosiphon pump had been available in the past - to the best of my knowledge it's never been part of the...

12 months ago
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Answer to: Type 45a: how to modify the friction factor?

@ken I think David is suggesting that, in the Fortran code, the value f is calculated first as either 64/Re or 0.032, then it is further modified by t...

12 months ago
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Answer to: Trnsys component that take waste heat in terms of heat rate

@mohammad-alrbai For a very simple/basic steam generator model, you could just insert something in an equation block like: mdot_steam = efficienc...

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

@ken We've modeled these systems in the past using a flat-plate collector from the TESS library (Type 1346 or similar, depending on the parameters pro...

12 months ago
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Answer to: Undefined reference to a LAPCK routine when compiling

@alish Are you using TypeStudio to compile your new Type? TypeStudio struggles with incorporating libraries (really anything that isn't a .f90 file) i...

1 year ago
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RE: Type 581 "file not found"

@sescuder I confirmed the same behavior with the v18 TESS Utility library. It's not immediately clear what the problem is, but I'll get back to you if...

1 year ago
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Answer to: Interrogations concerning 'upstream component mode' in type 34, in combination with type 67

Hello, I think your interpretation of how to set the "upstream component mode" in Type 34 is correct. Getting negative values for the fraction of so...

1 year ago
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RE: How to write set of first-order equations using the Fortran language

@tm-abir-ahsan (Sorry for the delay! I was on vacation and am just now catching up on the correspondence I missed while away). Regarding whether...

1 year ago
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Answer to: Debug mode does not show variables value in Visual Studio

@alish See the second comment on this post for instructions to download older versions of Visual Studio : . I use Visual Studio 2019 on one of my mac...

1 year ago
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RE: new green roof component

@sajid In addition to the TESS libraries, TESS also has a number of models available for individual purchase. The green roof component is one of the i...

1 year ago
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Answer to: Issue with creating new component

An invalid floating point operation means the code tried to complete an undefined mathematical operation, like taking the square root of a negative nu...

1 year ago
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Answer to: Debug mode does not show variables value in Visual Studio

Hello Ali, I am not sure why hovering the mouse cursor over the variables does not show anything. If you click on the 'Watch 1' tab in the lower ...

1 year ago
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RE: Ground coupling model related Query

@tm-abir-ahsan I'm glad it worked! I think you can be forgiven for trying to use the entire 3D model ... the example files just show a two-dimensional...

1 year ago
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Answer to: Fprime_function, Solar thermal collector

Hello Shayan, See my reply here to another user who also wanted to re-compile Type 1 to produce different outputs and ran into the same problem with...

1 year ago
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RE: TRNSYS citation

@jen The list of contributors over the past 50 years to the TRNSYS software is rather long. The 4th page of the Mathematical Reference volume of docum...

1 year ago
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