IES-VE User Forum

Hello,

I'm a student using IES to evaluate passive building techniques in tropical countries, part of which uses jute sacking. I may have missed something in the User Guides and tutorials, but is there a way to make a custom material with a level of air permeability?

Another issue I'm having is with extracting useful results on human comfort levels. Is it possible to zone a room into two areas, one up to the average height of a human (say 1.75m) and another above this, where comfort levels are not important?

Apologies if I've been unclear, thanks for any help you can give.

Miles Fenton

Hi Miles,

1) I don't think the materials can have any permeability to them at all. The walls within IES are all 100% opaque and can have neither a level of permeability or visual transparency.
It's a tough one, I've never done anything like it to be honest. Maybe setting up a mad crack coefficient in MacroFlo and having many doors to represent areas of sacking? Not sure.

2) Yes. Not sure why you are doing it this way but I think you can do what you want like this
• Go into ModelIT
• Select the room
• push the down arrow to move into the room
• Change to Edit mode
• Switch to Z plane
• Select height (1.75)
• Create cutting plane
• divide space (no partitions)
• Separate space
You can then consider the two spaces as distinct zones - apply whatever thermal props you want.