How to have openings between spaces?

asked 2016-04-08 11:18:15 -0600

João Rodrigues

267 ●8

updated 2016-04-08 12:03:13 -0600

__AmirRoth__

4436 ●5 ●17 http://bleedinggreenna...

Hello guys,

I am making a building using the Sketchup and Openstudio, in order to make an analysis of the energy consumption of it.

However I have a problem in design, which is the need of openings between spaces. That is, I have a room, but I intend that it has an opening to another space, so that heat and mass exchanges are effected naturally.

The image reflects this situation. The selected surface should be open to a space which is adjacent ...

image description

How can I do this? Because sketchup only has 3 types of surface (floor, wall or roof) ...

I noticed that Openstudio has a subcategory in the materials called Air walls, is that the solution?

Cheers guys,

answered 2016-04-08 11:50:49 -0600

Adam Hilton

3465 ●1 ●15

Yes, air walls are a solution. Set both the constructions of the co-planer surfaces to the "Air Wall" construction. The two surfaces must belong to different spaces in different thermal zones. You'll need to also add the zone mixing object in order for it to work. There is a measure on the BCL called "air_wall_zone_mixing" that you can apply using "Apply Measures Now".

That aside, my opinion is that I don't think it's going to be a very accurate representation for vertical heat transfer depending on your ceiling heights. Stratification and natural convection aren't accounted for by default in E+ and thermal zones are assumed to be well mixed. Your model with air walls is really only going to give you the ability to share the load with both air volumes, rather than provide you with accurate zone temperatures. If that makes any sense...Look into the room air model if you want to try and predict zone temperature better for stacked thermal zones that share air.

Hope that helps.