[Bldg-sim] simulation program for green roof

Jones, Christopher cjones at halsall.com
Fri Sep 26 05:45:46 PDT 2014

Link to the paper referred to below:

Christopher Jones, P.Eng.
Tel: 416.644.4226 • Toll Free: 1.888.425.7255 x 527

From: Bldg-sim [mailto:bldg-sim-bounces at lists.onebuilding.org] On Behalf Of hamnmegs at ozemail.com.au
Sent: Friday, September 26, 2014 4:28 AM
To: Fred Betz; shahryar habibi; bldg-sim at lists.onebuilding.org
Subject: Re: [Bldg-sim] simulation program for green roof

But do all of these programs account fro the impact on the roof micro climate? None to my knowledge do. When you get a large roof surface the above roof air temperature bias can be 2-5DegC between a cool roof (or green roof) and more historical roof (higher absoprtance). These second order effects become essential to account for if you have mechanical equipmnt on the roof as ventilation air and condesning temperatures are impacted. We have been doing some research into this area in Australia. Think about the urban heat island effect at a micro scale, becomes very important with big box retail, shopping centres, industrial facilities, airports, maybe hospitals etc. for shopping centres in Australia with AHUs on the roof, E+, DOE-2.2 and IES only account for 20-25% of the cool roof benefits via th first order effects. The second order effects due to the micro climate bias are 3-4 times what is accounetd for within these programs ...

We haven't been able to get software developers to bring attention to this so if others can shake the tree it would be good as the workarounds while possible are quite involved with a high degree of uncertainty. There is a paper I wrote for IBPSA BS 2011 I can forward when I get back from leave in a few weeks for those interested.

Graham Carter

----- Original Message -----
"Fred Betz" <fbetz at aeieng.com<mailto:fbetz at aeieng.com>>

"shahryar habibi" <shahryar_habibi at yahoo.com<mailto:shahryar_habibi at yahoo.com>>, "bldg-sim at lists.onebuilding.org<mailto:bldg-sim at lists.onebuilding.org>" <bldg-sim at lists.onebuilding.org<mailto:bldg-sim at lists.onebuilding.org>>

Thu, 25 Sep 2014 20:23:22 +0000
Re: [Bldg-sim] simulation program for green roof

EnergyPlus has a model for green roofs

I’m not sure it handles acoustics, but it will simulate energy and water.

Fred Betz  PhD., LEED AP ®BD&C
Senior Sustainable
Systems Analyst

5802 Research Park Blvd. | Madison, WI  53719

P: 608.236.1175 | F: 608.238.2614
fbetz at aeieng.com<mailto:fbetz at aeieng.com>  |  www.aeieng.com<http://www.aeieng.com/>

From: shahryar habibi [mailto:shahryar_habibi at yahoo.com]
Sent: Thursday, September 25, 2014 9:00 AM
To: bldg-sim at lists.onebuilding.org<mailto:bldg-sim at lists.onebuilding.org>
Subject: [Bldg-sim] simulation program for green roof

 Dear Colleagues,

Would you tell me, please, which simulation program can simulate performance of green roofs.I would be grateful if you
could kindly guide me by offering any information . I am planning to simulate performance of one the building in terms of
energy and acoustic through green roof.

Thanks in advance for any help and advice
Shahryar Habibi, architect
PhD candidate in  Architectural Technology
University of Ferrara, Department of Architecture

<mailto:francesco.guidi at unife.it>

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