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

OpenStudio System Sizing Settings

asked 2015-08-11 11:10:39 -0500

updated 2015-08-11 11:30:44 -0500

I was modeling a simple air loop in OpenStudio, in the exported EnergyPlus IDF file, the "Sizing:System" object shows that the "100% Outdoor Air in Cooling" and the "100% Outdoor Air in Heating" were automatically set to "Yes". I think this would lead to significant over sizing of the cooling and heating coils. However, I did not find a place in the OpenSutdio user interface that I can specify these two fields to "No".

image description

image description

edit retag flag offensive close merge delete

1 Answer

Sort by ยป oldest newest most voted

answered 2015-08-11 11:36:26 -0500

Clicking the dotted line separating the Supply and Demand sides of the air loop exposes the drop-down fields to change these inputs in the Edit pane:

image description

edit flag offensive delete link more


Yes the fact that we are oversizing because of this setting has not gone unnoticed. Is it time to reconsider this default?

Kyle Benne's avatar Kyle Benne  ( 2015-08-11 16:32:31 -0500 )edit

@Kyle Benne - Interesting question IMO; this simple control (ON/OFF) is helpful for systems that use a large % of OA (gyms, auditoriums, etc.) as well as for identifying an upper-limit on potential equipment size. That being said, having it default to ON may not be the best if that majority of users either don't require/understand this control setting.

NickC's avatar NickC  ( 2015-08-17 15:33:00 -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: 2015-08-11 11:10:39 -0500

Seen: 721 times

Last updated: Aug 11 '15