Setting elevated floor in Honeybee

ladybug-tools
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1

Hi all,

I am modelling an elevated house (where the floor does not touch the ground). In DesignBuilder we can select the adjacency of the building to the ground like this:

  • 1-Auto - the adjacency of the surface is determined automatically by DesignBuilder based on its position. This is the default setting where external surfaces below the ground plane are considered to be adjacent to ground and external surfaces above the ground plane are considered to be adjacent to outside conditions.

  • 2-Not adjacent to ground - the surface is not adjacent to ground even if it is situated on or below the ground plane.

  • 3-Adjacent to ground - the surface is adjacent to ground even if it is above the ground plane or it is an internal surface.

  • 4-Adiabatic - the surface is adiabatic. This means that heat is not transferred across in its external surface. Adiabatic surfaces are frequently used in thermal modelling to represent surfaces which are between two zones at similar conditions.

But I could not find a similar setting in the Honeybee. Does someone ever model an elevated floor like this before?

house1

Thanks for your help!

2

hi @ricardo
You can set face boundary conditions with the HB Face component
image
as well as HB Properties by Guide Surface
image
there may be another couple ways to do it but there are some components to hopefully help.
-trevor

3

Hi @TrevorFedyna
Thanks for the info! So according to the description, I need to select the face of the floor and put ‘Outdoors’ as the bc since it is elevated, and not ‘Ground’. Is that correct?
There is also a confusing part, it says the default one is ‘Outdoors’. Which means all the default faces are not adjacent to the ground?
Perhaps @chris can also lead me to some sources about ground adjacency in Honeybee?

Regards

4

Design Builder does things differently at times.

yes, since your building does not touch the ground the outdoors boundary condition would be applicable.
a ground-adjacent surface refers to any building surface that is directly in contact with the ground.
-trevor

1 Like
5

Thanks, Trevor

This makes me wonder. Most tutorials available do not specify the ground adjacency and assume that all the floors in the zone are in contact with the ground. Does that make all those simulations inaccurate?