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Do all ResStock houses have adiabatic ground contact surfaces?

Hi,

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.

sashadf1's avatar
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sashadf1
asked 2021-04-08 11:55:36 -0500
__AmirRoth__'s avatar
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__AmirRoth__
updated 2021-04-14 19:57:13 -0500
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Open up a model and look......

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

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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.

sashadf1's avatar
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sashadf1
answered 2021-04-12 08:33:35 -0500, updated 2021-04-14 10:10:01 -0500
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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
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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
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