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Re: [EnergyPlus_Support] Green Roof
It would seem that one step towards this enhancement may need to be adding rain amounts to the weather file data for E+. I believe that currently there is only a raining indicator.
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
>>> yjhuang@xxxxxxx 5/20/2004 7:59:04 PM >>>
The main thermal effects of "green" roof are the soil moisture and
evapotransporation from the surface. Functionally, these are the same
effects that have to be considered in a ground heat-transfer model. Lester
Shen (formerly at the Underground Space Center in the Univ. of Minnesota)
and I incorporated these effects in ground heat-transfer work we did 15
years ago, One tricky part of it is that the results depends greatly on the
assumed evapotranspiration rate. Assume the soil is watered to the
evapotranspiration potential and the surface temperature will near the air
wet-bulb temperature; assume minimal watering and it wil be close to an
impervious surface. If you're interested, I could dig up the old code and
give you more details.
Joe
----- Original Message -----
From: "Griffith, Brent" <brent_griffith@xxxxxxxx>
To: <EnergyPlus_Support@xxxxxxxxxxxxxxx>
Sent: Thursday, May 20, 2004 10:53 PM
Subject: 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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