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

Do all ResStock houses have adiabatic ground contact surfaces?

asked 2021-04-08 11:55:36 -0500

sashadf1's avatar

updated 2021-04-14 19:57:13 -0500


Hopefully @EricWilson or @DavidGoldwasser can help me out.

I am using E+ v9.2, OS v2.9.0, and ResStock v2.2.4.

I added measure "Set Exterior Walls and Floors to Adiabatic" to my PAT Workflow, only changing "ground_floors" to adiabatic. The other surfaces (ext_roofs, ext_floors, north_walls, south_walls, east_walls, west_walls) were all unaltered by the measure.

The measure should only change the ground exposed floor surface to adiabatic.

only ground floor adiabatic

However, when looking at the log file, I noticed that the total number of adiabatic surfaces before and after the measure runs is the same (14).

same number of adiabatic surfaces

I sampled 10 buildings (datapoints), and they each had this feature in their log file.

This leads me to ask: are all the buildings in ResStock v2.2.4 assigned an adiabatic ground contact surface to begin with?

If so, that would explain why running this measure with ground_floors set to adiabatic doesn't seem to change the model.

edit retag flag offensive close merge delete



Open up a model and look......

shorowit's avatar shorowit  ( 2021-04-08 13:52:21 -0500 )edit

Would I find this information in the .osm file or the idf file?

sashadf1's avatar sashadf1  ( 2021-04-08 13:56:14 -0500 )edit

1 Answer

Sort by ยป oldest newest most voted

answered 2021-04-12 08:33:35 -0500

sashadf1's avatar

updated 2021-04-14 10:10:01 -0500

Site Ground Temperature is not used by my models to calculate ground heat transfer. This is because my models use Foundation Kiva instead of some other algorithm. If I look at the wall/floor surface boundary conditions, they are "Foundation," and the boundary condition object is a Foundation Kiva object.

Instead of playing with Kiva settings to try to minimize ground heat transfer, I am instead adapting a measure to change the boundary condition for surfaces with "Foundation" boundary conditions to "Adiabatic."

This should hopefully result in zero conduction between the building and the ground.

edit flag offensive delete link more



That's not correct. The ground heat transfer algorithm used by the ResStock models simply does not take ground temperatures as a user input, hence they had no impact. If you looked at the models, you would see how the ground heat transfer is calculated.

shorowit's avatar shorowit  ( 2021-04-12 09:37:46 -0500 )edit

I added a measure to affect the surfaces with "Foundation" (ie Kiva) boundary conditions, changing them to adiabatic. Hopefully this will make heat flow from the ground into the building zero.

sashadf1's avatar sashadf1  ( 2021-04-12 09:59:36 -0500 )edit

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: 2021-04-08 11:55:36 -0500

Seen: 95 times

Last updated: Apr 14 '21