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RE: [EnergyPlus_Support] Green Roof



I agree with Ned.  This capability is already on a list of possible enhancements to EnergyPlus.  If anyone has developed or identified models for live green roofs that might be suitable for annual building simulations, please let me know.  
 
Brent
brent_griffith@xxxxxxxx
 
-----Original Message-----
From: Edward Lyon [mailto:eglyon@xxxxxxx]
Sent: Thursday, May 20, 2004 8:39 AM
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
Subject: Re: [EnergyPlus_Support] Green Roof



I am not sure that you will get very accurate results using E+ to model a "live" green roof.  The problem is that the dynamics of soil and vegetation can't be input into the model.  There is no mechanism to incorporate soil cooling from rain or plant heat loss through evaporation.  The best E+ could model would be the mass effects...

Ned Lyon

Senior Project Manager
Simpson Gumpertz & Heger Inc.

41 Seyon Street
Building #1, Suite 500
Waltham, MA  02453

Phone:  781-907-9000
Fax:  781-907-9009


>>> fluizp@xxxxxxxxx 5/18/2004 7:18:50 PM >>>
   I'm developing a study based on green roof and want to know if anybody have
experience in this kind of simulation. I've noted that I will have to work with
MTF or EMPD Solution Algorithm, instead CTF (that I always used). In fact, I
have to consider the "alive" covering, that will have mass and heat transfer,
but don't know how to find data that describes the ground layer and the grass
covering. Grateful since already...

=====
Eng. Fábyo Luiz Pereira
UFRGS - Departamento de Engenharia Mecânica
Lafrig (Laboratório de Vapor e Refrigeração)
Rua Sarmento Leite, 425 - Sala 203 - Cidade Baixa
CEP 90050-170 - Porto Alegre - RS - BRASIL
Fone: +55 51 3316-3167
Cel: +55 51 8118-5052

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