[Bldg-sim] Modelling an eco-roof / green roof

[OConnor, Noel]

Great question!
We have also run into this item and to my knowledge there is no validated method for a solution in Europe either. 

I had heard MIT had done some modelling of same but cannot locate it on the web.

The quantitative benefit of a green roof to the insulative, cooling loads of buildings is very difficult to quantify as the roof constuction, roof media, depth of soil and vegetation, precipitation, temp, humidity and wind all habe to be factored in.

In all cases so far we have just claimed credit for using collected rainwater as grey or black water for washroom use, thereby reducing the buildings consumption of potable water.

Perhaps a topic for a Doctorate study?

Regards
Noel


Noel O Connor
Building Services Engineering Manager
National University of Ireland Galway
Ireland


________________________________

From: bldg-sim-bounces at lists.onebuilding.org 
To: bldg-sim at lists.onebuilding.org 
Sent: Mon May 18 18:57:54 2009
Subject: [Bldg-sim] Modelling an eco-roof / green roof 


I was wondering if anyone has any recommendations on how to model an eco-roof.  How are the U-values / R-values determined?  Are there any standards referenced or typical assumptions made?  Are there substantial energy savings associated with a eco-roof?

I've read a few studies that claim that there are and are not significant energy savings associated with an eco-roof, and I was under the impression that the major benefit of an eco-roof is storm water mitigation and possible sewage savings.  I was hoping that the bldg-sim group can shed some light on this topic. The projects I'm working on are typically in the Pacific NW, where I would think the energy savings associated with this technology would be minimal since the climate is fairly temperate.  I would appreciate any thoughts you might have on this technology, it's associated energy savings and modelling assumptions.

Thanks, 

Erin 

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