[Equest-users] Equest Green Roof Energyplus

[Chris Wark]

Heat transfer through green roofs is very misunderstood. The critical layer is the foliage and it turns out that foliage simply uses every heat transfer mechanism possible (particularly convection) to stay within a few degrees of ambient temperature. If you do the math, you'll see that evapotranspiration is highly overrated for low-profile extensive roofs. This means that you can reasonably simulate a green roof in eQUEST by calling the top layer (foliage) a perfect solar reflector with a U-value similar to a 1 inch air layer, a soil layer with about 1/2 the density and similar u-value to the library wet soil, another 1/2 to 1 inch air gap for the drain layer, and then the conventional roof layers below that.

The only way I know of moving info from eQUEST to E-Pro is to copy and paste lines from the eQUEST BDL file to the E-Pro BDL. Not sure if you can still do this with newer versions.

Christopher Wark
Project Engineer
___________________________
RUMSEY 
E N G I N E E R S
Energy Efficient Design 
99 Linden Street
Oakland CA 94607
510 663 2070 x 239
fax 510 663 2080
cwark at rumseyengineers.com 
www.rumseyengineers.com
___________________________

-----Original Message-----
From: equest-users-bounces at lists.onebuilding.org [mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Amol Mehta
Sent: Wednesday, February 18, 2009 4:19 PM
To: equest-users at lists.onebuilding.org
Subject: [Equest-users] Equest Green Roof Energyplus


Good Afternoon,

I was wondering is it possible to export file from Equest into EnergyPlus?
Basically I have modeled building in Equest, and the problem is its hard to
model green roof in Equest and I think it can be easily modeled in
EnergyPlus. Any help would be GREATLY appreciated. Thank you.

Regards,
Amol Mehta | Mechanical Engineer | P2S Engineering, Inc.
T 562 497 2999 | F 562 497 2990 | M 858 354 6250
5000 East Spring Street, 8th Floor, Long Beach, CA  90815





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