Question-and-Answer Resource for the Building Energy Modeling Community

Difference between design specification outdoor air and space infiltration design flow rates

asked 2022-09-28 17:47:25 -0600

Charlotte123
21 ●3

updated 2022-09-29 09:08:33 -0600

Aaron Boranian

14100 ●81 ●24 http://bigladdersoftware.com/

Hi there,

I am trying to model a residential building in OpenStudio and am on to infiltration but I am very confused what the difference is between design specification outdoor air and space infiltration design flow rates. Would someone be able to explain this to me?

For the residential building I know ACH should be 0.25 but am unsure which infiltration category this comes under, if someone is able to clarify?

Thanks.

edit retag flag offensive close merge delete

add a comment

1 Answer

Sort by » oldest newest most voted

answered 2022-10-01 07:21:30 -0600

Denis Bourgeois
2831 ●105 ●8 http://www.rd2.ca

updated 2022-10-01 07:23:33 -0600

In E+, DesignSpecification:OutdoorAir defines intentional ventilation outdoor air (calculation methodology and flow rates, optionally defined as ACH). This is usually required for zone load calculations, sizing calculations, HVAC controllers, etc.

In E+, ZoneInfiltration:DesignFlowRate describes unintentional infiltration rates (optionally as ACH). Similarly required for zone load calculations and sizing calculations.

In OpenStudio, both objects are associated to Spaces.

edit flag offensive delete link

Comments

Great thanks for that

Charlotte123 ( 2022-10-07 16:41:34 -0600 )edit

add a comment

Your Answer

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

Add Answer

Training Workshops

Careers

Question Tools

1 follower

Stats

Asked: 2022-09-28 17:20:08 -0600

Seen: 1,935 times

Last updated: Oct 01 '22

Site design and logo: Copyright © 2015 Big Ladder Software LLC. All rights reserved.
The Unmet Hours and Big Ladder names and logos are trademarks of Big Ladder Software LLC.
User contributions licensed under the Creative Commons Attribution Share Alike 3.0 License.

Difference between design specification outdoor air and space infiltration design flow rates edit