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

[Haider Khan]

On a similar topic, would you rank a reflective (cool) roof as more energy
efficient when compared to green roof?

thanks,
Haider.

On Mon, May 18, 2009 at 6:02 PM, OConnor, Noel <noel.oconnor at nuigalway.ie>wrote:

>  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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