Question-and-Answer Resource for the Building Energy Modeling Community
Get started with the Help page
Ask Your Question

Modelling Underfloor Ventilation (UFAD) Systems

asked 2016-04-20 21:07:49 -0500

buddy1187's avatar

updated 2016-04-21 07:25:04 -0500


I've searched and searched for an answer to my question, but I have not found anything related to this. I am using Sketchup 2016, Open Studio 1.11.0, and latest version of EnergyPlus The building I am modelling has underfloor ventilation systems (with supply diffusers) on the first, second, and third floor. When I am modelling the building shell and spaces, should I physically model the supply and return plenums associated with the Underfloor Ventilation System? Thanks in advance!

edit retag flag offensive close merge delete


Welcome @buddy1187. I've retagged your question using existing ones and naming conventions. Please always tag your questions with the software you're using. If you haven't already, you can click the "plenum" tag to see all related previous questions.

MatthewSteen's avatar MatthewSteen  ( 2016-04-21 07:29:38 -0500 )edit

Ok, thank you I will remember that for my next post :)

buddy1187's avatar buddy1187  ( 2016-04-21 08:14:48 -0500 )edit

2 Answers

Sort by ยป oldest newest most voted

answered 2016-04-21 10:11:32 -0500

A good place to start looking for answers is to look at the Example Files provided with EnergyPlus.

5ZoneSupRetPlenRAB.idf and 5ZoneSupRetPlenVSATU.idf are meant to illustrate how to model UFAD systems.

Open them up, you'll see that the underfloor plenums are indeed explicitly modeled.

image description

edit flag offensive delete link more


Thank you for pointing me in the right direction!

buddy1187's avatar buddy1187  ( 2016-04-22 14:09:04 -0500 )edit

answered 2016-04-22 09:26:29 -0500

BL's avatar

updated 2016-04-22 09:27:04 -0500

IES VE has a clear explanation about how to set up the system and space for UFAD system. Although the software is different from OS, I believe the core idea and heat transfer principals are very similar.

image description


edit flag offensive delete link more


Helloo Bo,

Thank you very much for your response. It looks like I got some floor shifting to do in my model to put these plenums in!


buddy1187's avatar buddy1187  ( 2016-04-22 14:11:37 -0500 )edit

Your Answer

Please start posting anonymously - your entry will be published after you log in or create a new account.

Add Answer

Question Tools


Asked: 2016-04-20 21:07:49 -0500

Seen: 540 times

Last updated: Apr 22 '16