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Could you clarify Infiltration entry fields?

asked 2021-09-21 09:11:39 -0600

keb gravatar image

updated 2021-09-22 13:07:59 -0600

In the documentation here , infiltration field are described that are included in the Space Types tab, under the Space Infiltration Flow Rates. However, Flow per Exterior Wall Surface Area is not included in the documentation descriptions. I'm looking for the appropriate entry field(s) and Design Flow Rate Calculation Method for inputting .4 cfm/ft2 of exterior wall area as referenced in 90.1 and IECC 2015. Could someone clarify this for me?

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answered 2021-09-24 09:45:36 -0600

Petros Dalavouras gravatar image

Given that your spaces are assigned with a space type, you can find the infiltration options at the "space types" tab under "Space Infiltration Design Flow Rates". Just click the object and choose the method that you would like to use. Below you will find a pic for clarification

Space Type Infiltration

If you want to assign a specific infiltration to a unique space you have to go to "Spaces" tab, click on "Airflow" sub-tab and assign an infiltration object from Library to a space. Remember that openstudio uses data inheritance.

Spaces Infiltation

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Your first point is how I originally thought it would be, but the units are incorrect in the input field if that's the way to do it. This is why I went to the terms description in the documentation. The units in the input field are m/s, or velocity, and not volume per unit area of exterior wall.

keb gravatar image keb  ( 2021-09-30 08:40:29 -0600 )edit

Yes the units are off both for "flow per exterior surface area" and "flow per space floor area". However, if you export the .idf file you will see that your value is at the correct field. The units are intended as m3/s*m2 in metric

Petros Dalavouras gravatar image Petros Dalavouras  ( 2021-09-30 10:08:33 -0600 )edit

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Asked: 2021-09-21 09:11:39 -0600

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Last updated: Sep 24