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

Two underground zones on top of each other with Kiva

asked 2022-02-23 05:47:03 -0500

Tokarzewski's avatar

updated 2022-03-01 02:17:31 -0500

Hi all,

Is it possible to model two underground zones -1 and -2 levels with Kiva?

I got the severe error which says I should add reference the kiva foundation to the internal floor which is also a ceiling for the zone -2 so I don't want to give it a foundation boundary condition.

* Severe * Surface="PIWNICA:ZONE2_WALL_2_0_0" has a 'Foundation' Outside Boundary Condition * ~~~ * referencing Foundation:Kiva="DEFAULT KIVA FOUNDATION_PIWNICA1:ZONE2_GROUNDFLOOR_0_0_0". * ~~~ * You must also reference Foundation:Kiva="DEFAULT KIVA FOUNDATION_PIWNICA1:ZONE2_GROUNDFLOOR_0_0_0" * ~~~ * in a floor surface within the same Zone="PIWNICA:ZONE2".

edit retag flag offensive close merge delete

1 Answer

Sort by ยป oldest newest most voted

answered 2022-02-28 17:39:52 -0500

updated 2022-03-01 09:34:37 -0500

Correct, when using Kiva for a zone in EnergyPlus, that zone must have one floor surface touching ground for Kiva to calculate heat transfer for. In your case, you can do two things:

  1. Keep the zones stacked, but use Kiva for only -2 level zone and change the boundary condition for the walls of the -1 level zone to "Ground" or another option that is not "Foundation" for Kiva

  2. Merge the two zones together, deleting the ceiling for the -2 level zone and floor for the -1 level zone or modeling that surface as internal mass instead.

The second option would likely be more accurate, assuming you merge the zones correctly (sum internal gains like lighting, e.g.).

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

1 follower


Asked: 2022-02-23 05:47:03 -0500

Seen: 126 times

Last updated: Mar 01 '22