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

100% Outdoor Air Unit No ERV

asked 2017-12-04 09:26:09 -0500

jmoody's avatar

updated 2017-12-05 15:15:35 -0500

Read through several DOAS discussions pertaining to using ERV's for 100% outdoor air. I have a specific application where I need to not have ERV's just cooling and heating coils (water cooled DX) that maintain specific leaving temperature and humidity ratio requirements.

I am working on testing a few options but wanted to see if anyone has done this before and has any input? Specifically on how to setup the controls for the leaving temperature and humidity requirements.

edit retag flag offensive close merge delete


what software are you using? Also a DOAS doesn't need to have an energy recovery wheel. Putting setpoints on the cooling and heating coils will control the coils as you require (this depends a bit on how you are modelling your system, but in general that works)

Annie Marston's avatar Annie Marston  ( 2017-12-04 13:31:02 -0500 )edit

I should have included that. I am using the latest Open Studio. What I really need to figure out, more because I have never used it before, is how to set the cooling coil to control to a leaving humidity ratio and then the heating coil or hot gas reheat would bring it back up to temperature.

jmoody's avatar jmoody  ( 2017-12-04 13:59:14 -0500 )edit

I'll put this in the answer as i think it is an answer rather than a comment

Annie Marston's avatar Annie Marston  ( 2017-12-04 15:47:41 -0500 )edit

1 Answer

Sort by ยป oldest newest most voted

answered 2017-12-04 15:49:54 -0500

To set temperatures and humidity ratios on coils you need to use setpoints. I know how to find these in EnergyPlus but not 100% sure in Openstudio, there are plenty of people on here who know how. But look for setpoints these will control the coils. It does depend a bit on how you set up your system though. If you are using a zone system the setpoints won't work in this way it is easier to control the systems when you set them up as AHUs.

edit flag offensive delete link more

Your Answer

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

Add Answer

Training Workshops


Question Tools


Asked: 2017-12-04 09:26:09 -0500

Seen: 339 times

Last updated: Dec 04 '17