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David Bradley ha scritto:
<blockquote cite="mid6.2.1.2.0.20060227163454.0338eec0@pop.iyonmail.com"
type="cite">Raj,<br>
I am not aware of a green roof model for TRNSYS. You could
certainly simulate a dry green roof by simply adding a soil material
layer to your Type56 wall description. The problem comes with dealing
with a wet roof, in which case the thermal properties can change quite
dramatically when the roof is dry or wet. I think you would have to
write
a model that takes Type56's inside surface temperature and simulates
the
temperature, and moisture gradients through the soil layer in your
roof.
The model would need to incorporate some algorithm to estimate the
moisture evaporation rate from the roof surface as well as the solar
incident on its surface. I would be interested to hear if people
have a different idea as to how to approach such a problem. We have
seen
a few projects come through with a green roof but never had one in
which
we were able to develop such a model.<br>
Cheers,<br>
David<br>
<br>
<br>
At 12:20 2/27/2006, RAJ KUMAR wrote:<br>
</blockquote>
Hi everybody, we recently published a paper on the topic of Green Roof,
quoted below.<br>
<br>
BUSATO
F., CASTELLOTTI F., LAZZARIN R. (2005). Experimental measurements and
numerical modelling of a green roof. ENERGY AND BUILDINGS. vol. 37, pp.
1260-1267 ISSN: 0378-7788.<br>
<br>
There you'll find a thermodynamic model for the physical system of a
green roof. To analyse measurements we wrote down mass and energy
balances, and solve it by iteration. <br>
We also developed a small predictive model in TRNSYS, that's what you
actually need. I would suggest you to read how we did model it.<br>
I hope it helps, if you have questions don't hesitate to ask!<br>
<br>
Regards<br>
Filippo<br>
<br>
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