Two underground zones on top of each other with Kiva

energyplus
kiva
designbuilder
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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".

504

Tokarzewski

asked 2022-02-23 05:47:03 -0500, updated 2022-03-01 02:17:31 -0500

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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:

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
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.).