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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DavidBradley
@davidbradley
Admin
Member
Joined: Jan 20, 2023
Last seen: Feb 14, 2025
Topics: 30 / Replies: 196
Reply
Answer to: VRF Heat Pump Models

Jingjing, Type581 is in the TESS Utility library. Types42 and 43 are basically the same concept but are a little more limited in the number of dep...

2 years ago
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Answer to: Vertical ground heat exchanger

Abir, The units are in h.m.K/kJ. Thank you for catching the omission. We will get the proformas fixed in the next version release. kind regards,...

2 years ago
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Answer to: VRF Heat Pump Models

Liu and László, There has been a good bit of interest in this topic lately. Some years ago I developed a VRF model of an air-to-air device in the c...

2 years ago
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Answer to: Shading device leads to higher temperatures

Jakob, When you add a shading device, it impacts only the radiation exchange. There is no coupled impact on the way that air flow is being handled....

2 years ago
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Answer to: Air resistance for internal shading screens

Abir, The impact that the drapes have on solar shading and the impact that they have on air resistance will need to be treated independently. Th...

2 years ago
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RE: Mathematical Description for the outputs in TRNBuild

@Jen I suppose the documentation infers that these are two terms in a larger outside surface energy balance. This might be a situation to contact your...

2 years ago
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Answer to: How can I add BIPVs in sketch up model with TRNSYS3D?

Trnsys3D is intended for drawing the geometry of building thermal envelopes. Trnsys3d's output is imported into TRNBuild and BIPVs are not specified i...

2 years ago
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Answer to: Mathematical Description for the outputs in TRNBuild

Type56's mathematical description is contained in its own manual: .\TrnsysXX\Documentation\05-MultizoneBuilding.pdf kind regards, David

2 years ago
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Answer to: Thermal air flow between two air nodes

The two options for having TRNSYS compute the flow between two air nodes are to implement either TRNFlow, which is a TRNSYS add-on that extends the TR...

2 years ago
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Answer to: Humidity capacitance ratio

Mohamed, I think you have to be a little careful here; the humidity capacitance multiplier is a way of telling the building model that there are o...

2 years ago
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Replies: 0
Views: 601
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Answer to: How do I set the initial temperature of an active layer?

What I would suggest is that you run your simulation for a day (simulation time, not real time!!) with a constant 12C (or whatever is appropriate) flo...

2 years ago
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