6 floors under the basement

[kokaka]

Hi ya,

I am about to start modelling a building which has 6 floors under the basement and they are not exposed to sun or atmosphere, there fore no solar gains I suppose. Apparently in Suncast i have taken some example buildings for practice purpose and the floors below basement does showed solar gains. In reality there won’t be any gains for floors/rooms under the basement. Does anybody shed a light about how to model such a building under Suncast and the results would replicate the reality in terms of solar gain results.

Cheers
K.T

[PCully]

Hi,

Apply an Adjacent Condition tot he surfaces to define them as being underground. We normally advise to apply the Absolute profile Constant 10 to achieve the effects of ground contact.

A quick way to do this in Apache is to use the Edit Multiple Adjacencies tool.

Then when you run an Apache simulation and check results for the underground rooms you will find they have no solar gains. test it out for yourself to see how this works.

Phil

[Nicko11]

How does the software recognise that there is no solar gain?

I am sure I have read somewhere that IES intend to release a version with ground as an adjacency option, is this true?

[luanaepb]

Hi,

I also have one doubt related to this topic.

I tried successfully to define the adjacent condition to the mentioned profile and actualy there was no solar gains when I ran Apache.

But I would like to know if I we have to change the ground plane, in Suncast, to reflect the fact that the 6 floors are under the basement.

Thank you.

[PCully]

I'm not quite sure what you mean by this? Did You draw the rooms under Z=0m? this is the ground plane level e.g. in modelviewer or in the SunCast images but really thermally it has no impact on your model as long as you represent underground surfaces using the adjacent condition profile.

Phil

[luanaepb]

Hi Phill,

I draw the 6 floors from Z=0. So, the basement starts at Z=16.20m.

So I keep the ground plane and Z=0, as there is no thermal impact on my model?

Thank you.

[PCully]

Whether you draw a room at z = -20m or z = 20m won't make any difference to ApacheSim. As long as you assign the adjacent condition profile to hget the correct solar gains.

You can run some test sims to confirm this if you like

Phil

[KasperS]

Does this mean that IES cannot take into account that some buildingparts absorb a lot of sun, eg a black surface of the building? If IES does that, then it will matter where you place your building, and basements should be modeled Z<0m.

[PCully]

I think the absorption is all handled via the External Constructions Surface Emissivity and Absorption but again position in the Z-plane of the room in relation to z=0 has no impact here

Phil

[selcuk]

I am trying to edit the adjacency of the exterior walls of the basement floor before apache simulation. I chhose temperature from profile for the adjacent condition but I can not change the temperature profile from constant 0 to anything else. I click the selecti but the constant 0 is the only option. Phil suggested to choose constant 10 for the basement floors. For me it is not accessible now. Can you suggest an option for me?