Does anyone have idea if we could model the benefit of using green wall (Vegetated)?
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CS-2009 EAp2: Minimum Energy Performance
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Green Wall
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Marcus Sheffer
LEED Fellow7group / Energy Opportunities
LEEDuser Expert
5912 thumbs up
March 13, 2013 - 9:31 am
If you can model external shading with a varying degree of transparency on a schedule (assuming deciduous plants) then you can simulate that benefit. I am not aware of modeling software that could account for the cooling effect from evapotranspiration of the plants however.
Yoyo Shek
Allied Environmental Consultants Limited4 thumbs up
March 14, 2013 - 2:29 am
Thanks Marcus
I am an Equest-user. I know that Equest does not have such function unfortunately.
Do you think we could apply a U-value to claim the benefit?
Marcus Sheffer
LEED Fellow7group / Energy Opportunities
LEEDuser Expert
5912 thumbs up
March 14, 2013 - 9:41 am
Perhaps I need to understand what you mean by a green wall. I am envisioning a cable system with vines growing on them. We are eQUEST users as well and have modeled that type of green wall as I described. You can account for the shading effect.
The type of green wall I am thinking of or the alternative which is more densely planted really has no resistance to conductive energy loss. Same with a green roof - there is no real R-value. So there is no U-value associated with a green wall.
Yoyo Shek
Allied Environmental Consultants Limited4 thumbs up
March 14, 2013 - 10:27 pm
If you don't mind, is it possible to give me little hints about "varying degree of transparency"?
I was doing another project that with glass fins and overhangs. But I was not able to use equest to model the effect and finally I used another program called "IES".
Marcus Sheffer
LEED Fellow7group / Energy Opportunities
LEEDuser Expert
5912 thumbs up
March 14, 2013 - 11:07 pm
Materials in the model can be assigned a percentage of transparency. For example we attempted to simulate trees surrounding a recent project. We obtained tree heights and images of the surrounding woods. We created rectilinear boxes around the building at the proper distance. We then assigned a degree of transparency to the trees that we scheduled to change seasonally. I think we modeled something like 85% transparency in the winter and 15% in the summer. Not perfect be it should give us an idea of the effect. If you need more specifics let me know.
Yoyo Shek
Allied Environmental Consultants Limited4 thumbs up
March 15, 2013 - 12:35 am
Thanks Marcus, That is really a new knowledge to me!
I've spent some times on playing with equest. I am able to find out the "Blind" and the corresponding schedule. Do you refer to such?
Or there is actually some hidden button for adjusting the transparency of wall?
Let me try to guess your approach. The rectilinear boxes were created with all the wall set to be "window". Thus blind is assigned to reflect the transparency and schedule.
Thanks again!
Marcus Sheffer
LEED Fellow7group / Energy Opportunities
LEEDuser Expert
5912 thumbs up
March 18, 2013 - 9:29 am
It is neither a blind or a wall or a window.
Create a building shade and position it where the green wall is located. You can then adjust the transparency and change it with a schedule.
Yoyo Shek
Allied Environmental Consultants Limited4 thumbs up
March 19, 2013 - 12:06 am
I got it! thanks!