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Foundation boundary condition (Foundation:Kiva)

asked 2017-05-19 04:14:30 -0500

Ali Raad's avatar

updated 2017-05-19 11:00:36 -0500

When I use Foundation boundary condition for the slab I can't get Surface Outside Face variables which is very understandable. However, is there anyway to be able to measure the temperature within the slab. Although I am using the CFD algorithm the nodes that is created inside the floor surface will not have any result I assume that is related to the fact that Foundation:Kiva does not use the same algorithm as the rest of the model.

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This is a good question for @Neal Kruis to answer, since he oversaw the integration of Kiva into EnergyPlus version 8.7.

Aaron Boranian's avatar Aaron Boranian  ( 2017-05-19 10:33:54 -0500 )edit

Yeah, I'm really interested to know @Neal Kruis 's idea and recommendation regarding that issue.

Ali Raad's avatar Ali Raad  ( 2017-05-19 13:26:42 -0500 )edit

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answered 2017-05-22 09:27:33 -0500

At this point there is no way to output temperatures within the slab or the soil surrounding the foundation. The temperatures vary in two dimensions and there isn't yet a convenient way to export the two-dimensional temperature map of the foundation and ground into the normal time series output of EnergyPlus.

The only outputs available are the inside surface variables. See the documentation for a more thorough explanation.

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Thank you very much. May I know what do think about running a simulation on E+ using Foundation as the outside boundary condition to obtain the Air temperature of the zone (Hourly). Then, create a Indoor Air Temperature File to be used as input in KIVA separately. Do you think using this method will help me to simulate the slab and take advantage of the more outputs of KIVA?

Your assistance in this matter would be greatly appreciated.

Ali Raad's avatar Ali Raad  ( 2017-05-22 09:50:16 -0500 )edit

That's a good approach! You can use the indoor air temperatures from EnergyPlus as input in Kiva and generate a PNG snapshot of the ground temperatures.

Neal Kruis's avatar Neal Kruis  ( 2017-05-22 10:10:20 -0500 )edit

Thank you, I really appreciate your help.

Ali Raad's avatar Ali Raad  ( 2017-05-22 10:55:27 -0500 )edit

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Asked: 2017-05-19 04:14:30 -0500

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Last updated: May 22 '17