David,
Thank you for your answer.
I used a Type14h to define the unshaded fraction of the façade over
a year.
Then I used 2 Type 34, one after the other: the first one with
only wingwall, the second with overhang.
Overhang inputs are coming from an equation module which
calculate the fraction of solar shading coming from Type14h and from Wingwall
module.
Then, I’m trying two different strategies:
1-
I’m trying the
simulation when using only “Fraction of solar shading” as output
from the calculation module, going to a new variable in my BUI file, used in “external
shading factor” for the window shaded by a pergola.
2-
I’m also trying to use
IT, Beam radiation and angle of incidence as output from the calculation
module, to a new orientation I defined in my BUI file.
Which strategy would you prefer?
Last question: when using 2 type 34, one after the other, do I have
to put “upstream component mode” of the second Type 34 on “1”
?
Thank you very much for your kind help.
Best regards,
Murielle Douté
_______________________________
POLENN
Ingénierie de la performance énergétique
www.polenn.com
Immeuble Oméga
Rue Jean-Marie David,
35 740 Pacé
Tel: 02 23 46 14 36
Fax: 02 90 92 00 71
De : David Bradley
[mailto:bradley@tess-inc.com]
Envoyé : vendredi 29 février 2008 21:55
À : Murielle Douté; trnsys-users@engr.wisc.edu
Objet : Re: [TRNSYS-users] Pergola as Shading mask
Murielle,
You are correct that when calculating the shaded radiation falling on a
facade, Type34 assumes that the overhang and wing walls are opaque. However,
Type34 also outputs the fraction of the facade that is shaded and the fraction
that is unshaded. If you were able to define a translucence for the pergola (in
other words the pergola doesn't fully block the sun but only some part of it.
The translucence would be a measure of the fraction of sunlight that is allowed
through either when vegetated or unvegetated.) then I think you could use the
Type34 shading fractions, adjusted for a translucent overhang.
Kind regards,
David
At 09:58 2/28/2008, Murielle Douté wrote:
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boundary="----=_NextPart_000_0024_01C87A2B.345AFDE0"
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Dear trnsys users,
I’d like to modelize the effect of a pergola, with or without vegetation,
on a window.
It doesn’t seems to be possible with “Type 34”.
Does anyone has an idea about that?
Best regards,
Murielle Douté
_______________________________
POLENN
Ingénierie de la performance énergétique
www.polenn.com
Immeuble Oméga
Rue Jean-Marie David,
35 740 Pacé
Tel: 02 23 46 14 36
Fax: 02 90 92 00 71
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